154 files changed, 4286 insertions, 3211 deletions

diff --git a/arch/alpha/include/asm/scatterlist.h b/arch/alpha/include/asm/scatterlist.h
index 5728c52a7412..017d7471c3c4 100644
--- a/arch/alpha/include/asm/scatterlist.h
+++ b/arch/alpha/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (~0UL)
-
 #endif /* !(_ALPHA_SCATTERLIST_H) */
diff --git a/arch/avr32/include/asm/scatterlist.h b/arch/avr32/include/asm/scatterlist.h
index 06394e5ead6c..a5902d9834e8 100644
--- a/arch/avr32/include/asm/scatterlist.h
+++ b/arch/avr32/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0xffffffff)
-
 #endif /* __ASM_AVR32_SCATTERLIST_H */
diff --git a/arch/blackfin/include/asm/scatterlist.h b/arch/blackfin/include/asm/scatterlist.h
index 64d41d34ab0b..d177a1588958 100644
--- a/arch/blackfin/include/asm/scatterlist.h
+++ b/arch/blackfin/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD       (0xffffffff)
-
 #endif                          /* !(_BLACKFIN_SCATTERLIST_H) */
diff --git a/arch/cris/include/asm/scatterlist.h b/arch/cris/include/asm/scatterlist.h
index 249a7842ff5f..f11f8f40ec4a 100644
--- a/arch/cris/include/asm/scatterlist.h
+++ b/arch/cris/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0x1fffffff)
-
 #endif /* !(__ASM_CRIS_SCATTERLIST_H) */
diff --git a/arch/frv/include/asm/scatterlist.h b/arch/frv/include/asm/scatterlist.h
index 1614bfd7e3a4..0e5eb3018468 100644
--- a/arch/frv/include/asm/scatterlist.h
+++ b/arch/frv/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0xffffffffUL)
-
 #endif /* !_ASM_SCATTERLIST_H */
diff --git a/arch/h8300/include/asm/scatterlist.h b/arch/h8300/include/asm/scatterlist.h
index de08a4a2cc1c..82130eda0e5f 100644
--- a/arch/h8300/include/asm/scatterlist.h
+++ b/arch/h8300/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD       (0xffffffff)
-
 #endif /* !(_H8300_SCATTERLIST_H) */
diff --git a/arch/ia64/include/asm/scatterlist.h b/arch/ia64/include/asm/scatterlist.h
index f299a4fb25c8..08fd93bff1db 100644
--- a/arch/ia64/include/asm/scatterlist.h
+++ b/arch/ia64/include/asm/scatterlist.h
@@ -2,15 +2,6 @@
 #define _ASM_IA64_SCATTERLIST_H
 
 #include <asm-generic/scatterlist.h>
-/*
- * It used to be that ISA_DMA_THRESHOLD had something to do with the
- * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
- * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
- * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
- * address of a page is that is allocated with GFP_DMA.  On IA-64,
- * that's 4GB - 1.
- */
-#define ISA_DMA_THRESHOLD       0xffffffff
 #define ARCH_HAS_SG_CHAIN
 
 #endif /* _ASM_IA64_SCATTERLIST_H */
diff --git a/arch/m32r/include/asm/scatterlist.h b/arch/m32r/include/asm/scatterlist.h
index aeeddd8dac17..7370b8b6243e 100644
--- a/arch/m32r/include/asm/scatterlist.h
+++ b/arch/m32r/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0x1fffffff)
-
 #endif /* _ASM_M32R_SCATTERLIST_H */
diff --git a/arch/m68k/include/asm/scatterlist.h b/arch/m68k/include/asm/scatterlist.h
index 175da06c6b95..312505452a1e 100644
--- a/arch/m68k/include/asm/scatterlist.h
+++ b/arch/m68k/include/asm/scatterlist.h
@@ -3,7 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-/* This is bogus and should go away. */
-#define ISA_DMA_THRESHOLD (0x00ffffff)
-
 #endif /* !(_M68K_SCATTERLIST_H) */
diff --git a/arch/microblaze/include/asm/scatterlist.h b/arch/microblaze/include/asm/scatterlist.h
index dc4a8900cc80..35d786fe93ae 100644
--- a/arch/microblaze/include/asm/scatterlist.h
+++ b/arch/microblaze/include/asm/scatterlist.h
@@ -1,3 +1 @@
 #include <asm-generic/scatterlist.h>
-
-#define ISA_DMA_THRESHOLD       (~0UL)
diff --git a/arch/mips/include/asm/scatterlist.h b/arch/mips/include/asm/scatterlist.h
index 9af65e79be36..7ee0e646d82c 100644
--- a/arch/mips/include/asm/scatterlist.h
+++ b/arch/mips/include/asm/scatterlist.h
@@ -3,6 +3,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0x00ffffffUL)
-
 #endif /* __ASM_SCATTERLIST_H */
diff --git a/arch/mn10300/include/asm/scatterlist.h b/arch/mn10300/include/asm/scatterlist.h
index 7bd00b9e030d..7baa4006008a 100644
--- a/arch/mn10300/include/asm/scatterlist.h
+++ b/arch/mn10300/include/asm/scatterlist.h
@@ -13,6 +13,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0x00ffffff)
-
 #endif /* _ASM_SCATTERLIST_H */
diff --git a/arch/parisc/include/asm/scatterlist.h b/arch/parisc/include/asm/scatterlist.h
index 2c3b79b54b28..8bf1f0dd1f15 100644
--- a/arch/parisc/include/asm/scatterlist.h
+++ b/arch/parisc/include/asm/scatterlist.h
@@ -5,7 +5,6 @@
 #include <asm/types.h>
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (~0UL)
 #define sg_virt_addr(sg) ((unsigned long)sg_virt(sg))
 
 #endif /* _ASM_PARISC_SCATTERLIST_H */
diff --git a/arch/powerpc/include/asm/scatterlist.h b/arch/powerpc/include/asm/scatterlist.h
index 34cc78fd0ef4..de1f620bd5c9 100644
--- a/arch/powerpc/include/asm/scatterlist.h
+++ b/arch/powerpc/include/asm/scatterlist.h
@@ -12,9 +12,6 @@
 #include <asm/dma.h>
 #include <asm-generic/scatterlist.h>
 
-#ifdef __powerpc64__
-#define ISA_DMA_THRESHOLD       (~0UL)
-#endif
 #define ARCH_HAS_SG_CHAIN
 
 #endif /* _ASM_POWERPC_SCATTERLIST_H */
diff --git a/arch/s390/include/asm/scatterlist.h b/arch/s390/include/asm/scatterlist.h
index be44d94cba54..35d786fe93ae 100644
--- a/arch/s390/include/asm/scatterlist.h
+++ b/arch/s390/include/asm/scatterlist.h
@@ -1,3 +1 @@
-#define ISA_DMA_THRESHOLD       (~0UL)
-
 #include <asm-generic/scatterlist.h>
diff --git a/arch/score/include/asm/scatterlist.h b/arch/score/include/asm/scatterlist.h
index 4fa1a6658215..9f533b8362c7 100644
--- a/arch/score/include/asm/scatterlist.h
+++ b/arch/score/include/asm/scatterlist.h
@@ -1,8 +1,6 @@
 #ifndef _ASM_SCORE_SCATTERLIST_H
 #define _ASM_SCORE_SCATTERLIST_H
 
-#define ISA_DMA_THRESHOLD       (~0UL)
-
 #include <asm-generic/scatterlist.h>
 
 #endif /* _ASM_SCORE_SCATTERLIST_H */
diff --git a/arch/sh/include/asm/scatterlist.h b/arch/sh/include/asm/scatterlist.h
index e38d1d4c7f6f..98dfc3510f10 100644
--- a/arch/sh/include/asm/scatterlist.h
+++ b/arch/sh/include/asm/scatterlist.h
@@ -1,8 +1,6 @@
 #ifndef __ASM_SH_SCATTERLIST_H
 #define __ASM_SH_SCATTERLIST_H
 
-#define ISA_DMA_THRESHOLD       phys_addr_mask()
-
 #include <asm-generic/scatterlist.h>
 
 #endif /* __ASM_SH_SCATTERLIST_H */
diff --git a/arch/sparc/include/asm/scatterlist.h b/arch/sparc/include/asm/scatterlist.h
index 433e45f05fd4..92bb638313f8 100644
--- a/arch/sparc/include/asm/scatterlist.h
+++ b/arch/sparc/include/asm/scatterlist.h
@@ -3,7 +3,6 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD       (~0UL)
 #define ARCH_HAS_SG_CHAIN
 
 #endif /* !(_SPARC_SCATTERLIST_H) */
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index da992a3ad6b7..1bcd208c459f 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -33,6 +33,7 @@
 #include "linux/mm.h"
 #include "linux/slab.h"
 #include "linux/vmalloc.h"
+#include "linux/smp_lock.h"
 #include "linux/blkpg.h"
 #include "linux/genhd.h"
 #include "linux/spinlock.h"
@@ -1098,6 +1099,7 @@ static int ubd_open(struct block_device *bdev, fmode_t mode)
         struct ubd *ubd_dev = disk->private_data;
         int err = 0;
 
+        lock_kernel();
         if(ubd_dev->count == 0){
                 err = ubd_open_dev(ubd_dev);
                 if(err){
@@ -1115,7 +1117,8 @@ static int ubd_open(struct block_device *bdev, fmode_t mode)
                 if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
                 err = -EROFS;
         }*/
- out:
+out:
+        unlock_kernel();
         return err;
 }
 
@@ -1123,8 +1126,10 @@ static int ubd_release(struct gendisk *disk, fmode_t mode)
 {
         struct ubd *ubd_dev = disk->private_data;
 
+        lock_kernel();
         if(--ubd_dev->count == 0)
                 ubd_close_dev(ubd_dev);
+        unlock_kernel();
         return 0;
 }
 
diff --git a/arch/x86/include/asm/scatterlist.h b/arch/x86/include/asm/scatterlist.h
index fb0b1874396f..4240878b9d76 100644
--- a/arch/x86/include/asm/scatterlist.h
+++ b/arch/x86/include/asm/scatterlist.h
@@ -3,7 +3,6 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (0x00ffffff)
 #define ARCH_HAS_SG_CHAIN
 
 #endif /* _ASM_X86_SCATTERLIST_H */
diff --git a/arch/xtensa/include/asm/scatterlist.h b/arch/xtensa/include/asm/scatterlist.h
index b1f9fdc1d5ba..a0421a61d9e1 100644
--- a/arch/xtensa/include/asm/scatterlist.h
+++ b/arch/xtensa/include/asm/scatterlist.h
@@ -13,6 +13,4 @@
 
 #include <asm-generic/scatterlist.h>
 
-#define ISA_DMA_THRESHOLD (~0UL)
-
 #endif  /* _XTENSA_SCATTERLIST_H */
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index 0d710c9d403b..f0faefca032f 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -13,7 +13,6 @@
  * blk_queue_ordered - does this queue support ordered writes
  * @q:        the request queue
  * @ordered:  one of QUEUE_ORDERED_*
- * @prepare_flush_fn: rq setup helper for cache flush ordered writes
  *
  * Description:
  *   For journalled file systems, doing ordered writes on a commit
@@ -22,15 +21,8 @@
  *   feature should call this function and indicate so.
  *
  **/
-int blk_queue_ordered(struct request_queue *q, unsigned ordered,
-                      prepare_flush_fn *prepare_flush_fn)
+int blk_queue_ordered(struct request_queue *q, unsigned ordered)
 {
-        if (!prepare_flush_fn && (ordered & (QUEUE_ORDERED_DO_PREFLUSH |
-                                             QUEUE_ORDERED_DO_POSTFLUSH))) {
-                printk(KERN_ERR "%s: prepare_flush_fn required\n", __func__);
-                return -EINVAL;
-        }
-
         if (ordered != QUEUE_ORDERED_NONE &&
             ordered != QUEUE_ORDERED_DRAIN &&
             ordered != QUEUE_ORDERED_DRAIN_FLUSH &&
@@ -44,7 +36,6 @@ int blk_queue_ordered(struct request_queue *q, unsigned ordered,
 
         q->ordered = ordered;
         q->next_ordered = ordered;
-        q->prepare_flush_fn = prepare_flush_fn;
 
         return 0;
 }
@@ -79,7 +70,7 @@ unsigned blk_ordered_req_seq(struct request *rq)
          *
          * http://thread.gmane.org/gmane.linux.kernel/537473
          */
-        if (!blk_fs_request(rq))
+        if (rq->cmd_type != REQ_TYPE_FS)
                 return QUEUE_ORDSEQ_DRAIN;
 
         if ((rq->cmd_flags & REQ_ORDERED_COLOR) ==
@@ -143,10 +134,10 @@ static void queue_flush(struct request_queue *q, unsigned which)
         }
 
         blk_rq_init(q, rq);
-        rq->cmd_flags = REQ_HARDBARRIER;
-        rq->rq_disk = q->bar_rq.rq_disk;
+        rq->cmd_type = REQ_TYPE_FS;
+        rq->cmd_flags = REQ_HARDBARRIER | REQ_FLUSH;
+        rq->rq_disk = q->orig_bar_rq->rq_disk;
         rq->end_io = end_io;
-        q->prepare_flush_fn(q, rq);
 
         elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
 }
@@ -203,7 +194,7 @@ static inline bool start_ordered(struct request_queue *q, struct request **rqp)
                 /* initialize proxy request and queue it */
                 blk_rq_init(q, rq);
                 if (bio_data_dir(q->orig_bar_rq->bio) == WRITE)
-                        rq->cmd_flags |= REQ_RW;
+                        rq->cmd_flags |= REQ_WRITE;
                 if (q->ordered & QUEUE_ORDERED_DO_FUA)
                         rq->cmd_flags |= REQ_FUA;
                 init_request_from_bio(rq, q->orig_bar_rq->bio);
@@ -236,7 +227,8 @@ static inline bool start_ordered(struct request_queue *q, struct request **rqp)
 bool blk_do_ordered(struct request_queue *q, struct request **rqp)
 {
         struct request *rq = *rqp;
-        const int is_barrier = blk_fs_request(rq) && blk_barrier_rq(rq);
+        const int is_barrier = rq->cmd_type == REQ_TYPE_FS &&
+                                (rq->cmd_flags & REQ_HARDBARRIER);
 
         if (!q->ordseq) {
                 if (!is_barrier)
@@ -261,7 +253,7 @@ bool blk_do_ordered(struct request_queue *q, struct request **rqp)
          */
 
         /* Special requests are not subject to ordering rules. */
-        if (!blk_fs_request(rq) &&
+        if (rq->cmd_type != REQ_TYPE_FS &&
             rq != &q->pre_flush_rq && rq != &q->post_flush_rq)
                 return true;
 
@@ -319,6 +311,15 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
         if (!q)
                 return -ENXIO;
 
+        /*
+         * some block devices may not have their queue correctly set up here
+         * (e.g. loop device without a backing file) and so issuing a flush
+         * here will panic. Ensure there is a request function before issuing
+         * the barrier.
+         */
+        if (!q->make_request_fn)
+                return -ENXIO;
+
         bio = bio_alloc(gfp_mask, 0);
         bio->bi_end_io = bio_end_empty_barrier;
         bio->bi_bdev = bdev;
diff --git a/block/blk-core.c b/block/blk-core.c
index f0640d7f800f..7da630e25ae7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -184,7 +184,7 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
         printk(KERN_INFO "  bio %p, biotail %p, buffer %p, len %u\n",
                rq->bio, rq->biotail, rq->buffer, blk_rq_bytes(rq));
 
-        if (blk_pc_request(rq)) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 printk(KERN_INFO "  cdb: ");
                 for (bit = 0; bit < BLK_MAX_CDB; bit++)
                         printk("%02x ", rq->cmd[bit]);
@@ -608,6 +608,7 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
 
         q->request_fn           = rfn;
         q->prep_rq_fn           = NULL;
+        q->unprep_rq_fn         = NULL;
         q->unplug_fn            = generic_unplug_device;
         q->queue_flags          = QUEUE_FLAG_DEFAULT;
         q->queue_lock           = lock;
@@ -1135,30 +1136,46 @@ void blk_put_request(struct request *req)
 }
 EXPORT_SYMBOL(blk_put_request);
 
+/**
+ * blk_add_request_payload - add a payload to a request
+ * @rq: request to update
+ * @page: page backing the payload
+ * @len: length of the payload.
+ *
+ * This allows to later add a payload to an already submitted request by
+ * a block driver.  The driver needs to take care of freeing the payload
+ * itself.
+ *
+ * Note that this is a quite horrible hack and nothing but handling of
+ * discard requests should ever use it.
+ */
+void blk_add_request_payload(struct request *rq, struct page *page,
+                unsigned int len)
+{
+        struct bio *bio = rq->bio;
+
+        bio->bi_io_vec->bv_page = page;
+        bio->bi_io_vec->bv_offset = 0;
+        bio->bi_io_vec->bv_len = len;
+
+        bio->bi_size = len;
+        bio->bi_vcnt = 1;
+        bio->bi_phys_segments = 1;
+
+        rq->__data_len = rq->resid_len = len;
+        rq->nr_phys_segments = 1;
+        rq->buffer = bio_data(bio);
+}
+EXPORT_SYMBOL_GPL(blk_add_request_payload);
+
 void init_request_from_bio(struct request *req, struct bio *bio)
 {
         req->cpu = bio->bi_comp_cpu;
         req->cmd_type = REQ_TYPE_FS;
 
-        /*
-         * Inherit FAILFAST from bio (for read-ahead, and explicit
-         * FAILFAST).  FAILFAST flags are identical for req and bio.
-         */
-        if (bio_rw_flagged(bio, BIO_RW_AHEAD))
+        req->cmd_flags |= bio->bi_rw & REQ_COMMON_MASK;
+        if (bio->bi_rw & REQ_RAHEAD)
                 req->cmd_flags |= REQ_FAILFAST_MASK;
-        else
-                req->cmd_flags |= bio->bi_rw & REQ_FAILFAST_MASK;
-
-        if (bio_rw_flagged(bio, BIO_RW_DISCARD))
-                req->cmd_flags |= REQ_DISCARD;
-        if (bio_rw_flagged(bio, BIO_RW_BARRIER))
-                req->cmd_flags |= REQ_HARDBARRIER;
-        if (bio_rw_flagged(bio, BIO_RW_SYNCIO))
-                req->cmd_flags |= REQ_RW_SYNC;
-        if (bio_rw_flagged(bio, BIO_RW_META))
-                req->cmd_flags |= REQ_RW_META;
-        if (bio_rw_flagged(bio, BIO_RW_NOIDLE))
-                req->cmd_flags |= REQ_NOIDLE;
 
         req->errors = 0;
         req->__sector = bio->bi_sector;
@@ -1181,12 +1198,12 @@ static int __make_request(struct request_queue *q, struct bio *bio)
         int el_ret;
         unsigned int bytes = bio->bi_size;
         const unsigned short prio = bio_prio(bio);
-        const bool sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
-        const bool unplug = bio_rw_flagged(bio, BIO_RW_UNPLUG);
+        const bool sync = (bio->bi_rw & REQ_SYNC);
+        const bool unplug = (bio->bi_rw & REQ_UNPLUG);
         const unsigned int ff = bio->bi_rw & REQ_FAILFAST_MASK;
         int rw_flags;
 
-        if (bio_rw_flagged(bio, BIO_RW_BARRIER) &&
+        if ((bio->bi_rw & REQ_HARDBARRIER) &&
             (q->next_ordered == QUEUE_ORDERED_NONE)) {
                 bio_endio(bio, -EOPNOTSUPP);
                 return 0;
@@ -1200,7 +1217,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
 
         spin_lock_irq(q->queue_lock);
 
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER)) || elv_queue_empty(q))
+        if (unlikely((bio->bi_rw & REQ_HARDBARRIER)) || elv_queue_empty(q))
                 goto get_rq;
 
         el_ret = elv_merge(q, &req, bio);
@@ -1275,7 +1292,7 @@ get_rq:
          */
         rw_flags = bio_data_dir(bio);
         if (sync)
-                rw_flags |= REQ_RW_SYNC;
+                rw_flags |= REQ_SYNC;
 
         /*
          * Grab a free request. This is might sleep but can not fail.
@@ -1464,7 +1481,7 @@ static inline void __generic_make_request(struct bio *bio)
                         goto end_io;
                 }
 
-                if (unlikely(!bio_rw_flagged(bio, BIO_RW_DISCARD) &&
+                if (unlikely(!(bio->bi_rw & REQ_DISCARD) &&
                              nr_sectors > queue_max_hw_sectors(q))) {
                         printk(KERN_ERR "bio too big device %s (%u > %u)\n",
                                bdevname(bio->bi_bdev, b),
@@ -1497,8 +1514,7 @@ static inline void __generic_make_request(struct bio *bio)
                 if (bio_check_eod(bio, nr_sectors))
                         goto end_io;
 
-                if (bio_rw_flagged(bio, BIO_RW_DISCARD) &&
-                    !blk_queue_discard(q)) {
+                if ((bio->bi_rw & REQ_DISCARD) && !blk_queue_discard(q)) {
                         err = -EOPNOTSUPP;
                         goto end_io;
                 }
@@ -1583,7 +1599,7 @@ void submit_bio(int rw, struct bio *bio)
          * If it's a regular read/write or a barrier with data attached,
          * go through the normal accounting stuff before submission.
          */
-        if (bio_has_data(bio) && !(rw & (1 << BIO_RW_DISCARD))) {
+        if (bio_has_data(bio) && !(rw & REQ_DISCARD)) {
                 if (rw & WRITE) {
                         count_vm_events(PGPGOUT, count);
                 } else {
@@ -1628,6 +1644,9 @@ EXPORT_SYMBOL(submit_bio);
  */
 int blk_rq_check_limits(struct request_queue *q, struct request *rq)
 {
+        if (rq->cmd_flags & REQ_DISCARD)
+                return 0;
+
         if (blk_rq_sectors(rq) > queue_max_sectors(q) ||
             blk_rq_bytes(rq) > queue_max_hw_sectors(q) << 9) {
                 printk(KERN_ERR "%s: over max size limit.\n", __func__);
@@ -1796,7 +1815,7 @@ struct request *blk_peek_request(struct request_queue *q)
                          * sees this request (possibly after
                          * requeueing).  Notify IO scheduler.
                          */
-                        if (blk_sorted_rq(rq))
+                        if (rq->cmd_flags & REQ_SORTED)
                                 elv_activate_rq(q, rq);
 
                         /*
@@ -1984,10 +2003,11 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
          * TODO: tj: This is too subtle.  It would be better to let
          * low level drivers do what they see fit.
          */
-        if (blk_fs_request(req))
+        if (req->cmd_type == REQ_TYPE_FS)
                 req->errors = 0;
 
-        if (error && (blk_fs_request(req) && !(req->cmd_flags & REQ_QUIET))) {
+        if (error && req->cmd_type == REQ_TYPE_FS &&
+            !(req->cmd_flags & REQ_QUIET)) {
                 printk(KERN_ERR "end_request: I/O error, dev %s, sector %llu\n",
                                 req->rq_disk ? req->rq_disk->disk_name : "?",
                                 (unsigned long long)blk_rq_pos(req));
@@ -2074,7 +2094,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
         req->buffer = bio_data(req->bio);
 
         /* update sector only for requests with clear definition of sector */
-        if (blk_fs_request(req) || blk_discard_rq(req))
+        if (req->cmd_type == REQ_TYPE_FS || (req->cmd_flags & REQ_DISCARD))
                 req->__sector += total_bytes >> 9;
 
         /* mixed attributes always follow the first bio */
@@ -2111,11 +2131,32 @@ static bool blk_update_bidi_request(struct request *rq, int error,
             blk_update_request(rq->next_rq, error, bidi_bytes))
                 return true;
 
-        add_disk_randomness(rq->rq_disk);
+        if (blk_queue_add_random(rq->q))
+                add_disk_randomness(rq->rq_disk);
 
         return false;
 }
 
+/**
+ * blk_unprep_request - unprepare a request
+ * @req:        the request
+ *
+ * This function makes a request ready for complete resubmission (or
+ * completion).  It happens only after all error handling is complete,
+ * so represents the appropriate moment to deallocate any resources
+ * that were allocated to the request in the prep_rq_fn.  The queue
+ * lock is held when calling this.
+ */
+void blk_unprep_request(struct request *req)
+{
+        struct request_queue *q = req->q;
+
+        req->cmd_flags &= ~REQ_DONTPREP;
+        if (q->unprep_rq_fn)
+                q->unprep_rq_fn(q, req);
+}
+EXPORT_SYMBOL_GPL(blk_unprep_request);
+
 /*
  * queue lock must be held
  */
@@ -2126,11 +2167,15 @@ static void blk_finish_request(struct request *req, int error)
 
         BUG_ON(blk_queued_rq(req));
 
-        if (unlikely(laptop_mode) && blk_fs_request(req))
+        if (unlikely(laptop_mode) && req->cmd_type == REQ_TYPE_FS)
                 laptop_io_completion(&req->q->backing_dev_info);
 
         blk_delete_timer(req);
 
+        if (req->cmd_flags & REQ_DONTPREP)
+                blk_unprep_request(req);
+
+
         blk_account_io_done(req);
 
         if (req->end_io)
@@ -2363,7 +2408,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
                      struct bio *bio)
 {
         /* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw */
-        rq->cmd_flags |= bio->bi_rw & REQ_RW;
+        rq->cmd_flags |= bio->bi_rw & REQ_WRITE;
 
         if (bio_has_data(bio)) {
                 rq->nr_phys_segments = bio_phys_segments(q, bio);
@@ -2450,6 +2495,8 @@ static void __blk_rq_prep_clone(struct request *dst, struct request *src)
 {
         dst->cpu = src->cpu;
         dst->cmd_flags = (rq_data_dir(src) | REQ_NOMERGE);
+        if (src->cmd_flags & REQ_DISCARD)
+                dst->cmd_flags |= REQ_DISCARD;
         dst->cmd_type = src->cmd_type;
         dst->__sector = blk_rq_pos(src);
         dst->__data_len = blk_rq_bytes(src);
diff --git a/block/blk-exec.c b/block/blk-exec.c
index 49557e91f0da..e1672f14840e 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -57,7 +57,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
         __elv_add_request(q, rq, where, 1);
         __generic_unplug_device(q);
         /* the queue is stopped so it won't be plugged+unplugged */
-        if (blk_pm_resume_request(rq))
+        if (rq->cmd_type == REQ_TYPE_PM_RESUME)
                 q->request_fn(q);
         spin_unlock_irq(q->queue_lock);
 }
diff --git a/block/blk-lib.c b/block/blk-lib.c
index d0216b9f22d4..c1fc55a83ba1 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -19,7 +19,6 @@ static void blkdev_discard_end_io(struct bio *bio, int err)
 
         if (bio->bi_private)
                 complete(bio->bi_private);
-        __free_page(bio_page(bio));
 
         bio_put(bio);
 }
@@ -42,8 +41,8 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
         struct request_queue *q = bdev_get_queue(bdev);
         int type = flags & BLKDEV_IFL_BARRIER ?
                 DISCARD_BARRIER : DISCARD_NOBARRIER;
+        unsigned int max_discard_sectors;
         struct bio *bio;
-        struct page *page;
         int ret = 0;
 
         if (!q)
@@ -52,36 +51,30 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
         if (!blk_queue_discard(q))
                 return -EOPNOTSUPP;
 
-        while (nr_sects && !ret) {
-                unsigned int sector_size = q->limits.logical_block_size;
-                unsigned int max_discard_sectors =
-                        min(q->limits.max_discard_sectors, UINT_MAX >> 9);
+        /*
+         * Ensure that max_discard_sectors is of the proper
+         * granularity
+         */
+        max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
+        if (q->limits.discard_granularity) {
+                unsigned int disc_sects = q->limits.discard_granularity >> 9;
 
+                max_discard_sectors &= ~(disc_sects - 1);
+        }
+
+        while (nr_sects && !ret) {
                 bio = bio_alloc(gfp_mask, 1);
-                if (!bio)
-                        goto out;
+                if (!bio) {
+                        ret = -ENOMEM;
+                        break;
+                }
+
                 bio->bi_sector = sector;
                 bio->bi_end_io = blkdev_discard_end_io;
                 bio->bi_bdev = bdev;
                 if (flags & BLKDEV_IFL_WAIT)
                         bio->bi_private = &wait;
 
-                /*
-                 * Add a zeroed one-sector payload as that's what
-                 * our current implementations need.  If we'll ever need
-                 * more the interface will need revisiting.
-                 */
-                page = alloc_page(gfp_mask | __GFP_ZERO);
-                if (!page)
-                        goto out_free_bio;
-                if (bio_add_pc_page(q, bio, page, sector_size, 0) < sector_size)
-                        goto out_free_page;
-
-                /*
-                 * And override the bio size - the way discard works we
-                 * touch many more blocks on disk than the actual payload
-                 * length.
-                 */
                 if (nr_sects > max_discard_sectors) {
                         bio->bi_size = max_discard_sectors << 9;
                         nr_sects -= max_discard_sectors;
@@ -103,13 +96,8 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
                         ret = -EIO;
                 bio_put(bio);
         }
+
         return ret;
-out_free_page:
-        __free_page(page);
-out_free_bio:
-        bio_put(bio);
-out:
-        return -ENOMEM;
 }
 EXPORT_SYMBOL(blkdev_issue_discard);
 
@@ -157,7 +145,7 @@ static void bio_batch_end_io(struct bio *bio, int err)
 int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
                         sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
 {
-        int ret = 0;
+        int ret;
         struct bio *bio;
         struct bio_batch bb;
         unsigned int sz, issued = 0;
@@ -175,11 +163,14 @@ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
                         return ret;
         }
 submit:
+        ret = 0;
         while (nr_sects != 0) {
                 bio = bio_alloc(gfp_mask,
                                 min(nr_sects, (sector_t)BIO_MAX_PAGES));
-                if (!bio)
+                if (!bio) {
+                        ret = -ENOMEM;
                         break;
+                }
 
                 bio->bi_sector = sector;
                 bio->bi_bdev   = bdev;
@@ -198,6 +189,7 @@ submit:
                         if (ret < (sz << 9))
                                 break;
                 }
+                ret = 0;
                 issued++;
                 submit_bio(WRITE, bio);
         }
diff --git a/block/blk-map.c b/block/blk-map.c
index 9083cf0180cc..c65d7593f7f1 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -307,7 +307,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
                 return PTR_ERR(bio);
 
         if (rq_data_dir(rq) == WRITE)
-                bio->bi_rw |= (1 << BIO_RW);
+                bio->bi_rw |= (1 << REQ_WRITE);
 
         if (do_copy)
                 rq->cmd_flags |= REQ_COPY_USER;
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 5e7dc9973458..3b0cd4249671 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -12,7 +12,6 @@
 static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
                                              struct bio *bio)
 {
-        unsigned int phys_size;
         struct bio_vec *bv, *bvprv = NULL;
         int cluster, i, high, highprv = 1;
         unsigned int seg_size, nr_phys_segs;
@@ -24,7 +23,7 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
         fbio = bio;
         cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
         seg_size = 0;
-        phys_size = nr_phys_segs = 0;
+        nr_phys_segs = 0;
         for_each_bio(bio) {
                 bio_for_each_segment(bv, bio, i) {
                         /*
@@ -180,7 +179,7 @@ new_segment:
         }
 
         if (q->dma_drain_size && q->dma_drain_needed(rq)) {
-                if (rq->cmd_flags & REQ_RW)
+                if (rq->cmd_flags & REQ_WRITE)
                         memset(q->dma_drain_buffer, 0, q->dma_drain_size);
 
                 sg->page_link &= ~0x02;
@@ -226,7 +225,7 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
 {
         unsigned short max_sectors;
 
-        if (unlikely(blk_pc_request(req)))
+        if (unlikely(req->cmd_type == REQ_TYPE_BLOCK_PC))
                 max_sectors = queue_max_hw_sectors(q);
         else
                 max_sectors = queue_max_sectors(q);
@@ -250,7 +249,7 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
 {
         unsigned short max_sectors;
 
-        if (unlikely(blk_pc_request(req)))
+        if (unlikely(req->cmd_type == REQ_TYPE_BLOCK_PC))
                 max_sectors = queue_max_hw_sectors(q);
         else
                 max_sectors = queue_max_sectors(q);
diff --git a/block/blk-settings.c b/block/blk-settings.c
index f5ed5a1187ba..a234f4bf1d6f 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -37,6 +37,23 @@ void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn)
 EXPORT_SYMBOL(blk_queue_prep_rq);
 
 /**
+ * blk_queue_unprep_rq - set an unprepare_request function for queue
+ * @q:          queue
+ * @ufn:        unprepare_request function
+ *
+ * It's possible for a queue to register an unprepare_request callback
+ * which is invoked before the request is finally completed. The goal
+ * of the function is to deallocate any data that was allocated in the
+ * prepare_request callback.
+ *
+ */
+void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn)
+{
+        q->unprep_rq_fn = ufn;
+}
+EXPORT_SYMBOL(blk_queue_unprep_rq);
+
+/**
  * blk_queue_merge_bvec - set a merge_bvec function for queue
  * @q:          queue
  * @mbfn:       merge_bvec_fn
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 306759bbdf1b..001ab18078f5 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -180,26 +180,36 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
         return queue_var_show(max_hw_sectors_kb, (page));
 }
 
-static ssize_t queue_nonrot_show(struct request_queue *q, char *page)
-{
-        return queue_var_show(!blk_queue_nonrot(q), page);
+#define QUEUE_SYSFS_BIT_FNS(name, flag, neg)                            \
+static ssize_t                                                          \
+queue_show_##name(struct request_queue *q, char *page)                  \
+{                                                                       \
+        int bit;                                                        \
+        bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags);             \
+        return queue_var_show(neg ? !bit : bit, page);                  \
+}                                                                       \
+static ssize_t                                                          \
+queue_store_##name(struct request_queue *q, const char *page, size_t count) \
+{                                                                       \
+        unsigned long val;                                              \
+        ssize_t ret;                                                    \
+        ret = queue_var_store(&val, page, count);                       \
+        if (neg)                                                        \
+                val = !val;                                             \
+                                                                        \
+        spin_lock_irq(q->queue_lock);                                   \
+        if (val)                                                        \
+                queue_flag_set(QUEUE_FLAG_##flag, q);                   \
+        else                                                            \
+                queue_flag_clear(QUEUE_FLAG_##flag, q);                 \
+        spin_unlock_irq(q->queue_lock);                                 \
+        return ret;                                                     \
 }
 
-static ssize_t queue_nonrot_store(struct request_queue *q, const char *page,
-                                  size_t count)
-{
-        unsigned long nm;
-        ssize_t ret = queue_var_store(&nm, page, count);
-
-        spin_lock_irq(q->queue_lock);
-        if (nm)
-                queue_flag_clear(QUEUE_FLAG_NONROT, q);
-        else
-                queue_flag_set(QUEUE_FLAG_NONROT, q);
-        spin_unlock_irq(q->queue_lock);
-
-        return ret;
-}
+QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
+QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
+QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
+#undef QUEUE_SYSFS_BIT_FNS
 
 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
 {
@@ -250,27 +260,6 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
         return ret;
 }
 
-static ssize_t queue_iostats_show(struct request_queue *q, char *page)
-{
-        return queue_var_show(blk_queue_io_stat(q), page);
-}
-
-static ssize_t queue_iostats_store(struct request_queue *q, const char *page,
-                                   size_t count)
-{
-        unsigned long stats;
-        ssize_t ret = queue_var_store(&stats, page, count);
-
-        spin_lock_irq(q->queue_lock);
-        if (stats)
-                queue_flag_set(QUEUE_FLAG_IO_STAT, q);
-        else
-                queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
-        spin_unlock_irq(q->queue_lock);
-
-        return ret;
-}
-
 static struct queue_sysfs_entry queue_requests_entry = {
         .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
         .show = queue_requests_show,
@@ -352,8 +341,8 @@ static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
 
 static struct queue_sysfs_entry queue_nonrot_entry = {
         .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
-        .show = queue_nonrot_show,
-        .store = queue_nonrot_store,
+        .show = queue_show_nonrot,
+        .store = queue_store_nonrot,
 };
 
 static struct queue_sysfs_entry queue_nomerges_entry = {
@@ -370,8 +359,14 @@ static struct queue_sysfs_entry queue_rq_affinity_entry = {
 
 static struct queue_sysfs_entry queue_iostats_entry = {
         .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
-        .show = queue_iostats_show,
-        .store = queue_iostats_store,
+        .show = queue_show_iostats,
+        .store = queue_store_iostats,
+};
+
+static struct queue_sysfs_entry queue_random_entry = {
+        .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
+        .show = queue_show_random,
+        .store = queue_store_random,
 };
 
 static struct attribute *default_attrs[] = {
@@ -394,6 +389,7 @@ static struct attribute *default_attrs[] = {
         &queue_nomerges_entry.attr,
         &queue_rq_affinity_entry.attr,
         &queue_iostats_entry.attr,
+        &queue_random_entry.attr,
         NULL,
 };
 
diff --git a/block/blk.h b/block/blk.h
index 5ee3d7e72feb..6e7dc87141e4 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -161,8 +161,10 @@ static inline int blk_cpu_to_group(int cpu)
  */
 static inline int blk_do_io_stat(struct request *rq)
 {
-        return rq->rq_disk && blk_rq_io_stat(rq) &&
-               (blk_fs_request(rq) || blk_discard_rq(rq));
+        return rq->rq_disk &&
+               (rq->cmd_flags & REQ_IO_STAT) &&
+               (rq->cmd_type == REQ_TYPE_FS ||
+                (rq->cmd_flags & REQ_DISCARD));
 }
 
 #endif
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 7982b830db58..eb4086f7dfef 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -458,7 +458,7 @@ static inline struct cfq_data *cic_to_cfqd(struct cfq_io_context *cic)
  */
 static inline bool cfq_bio_sync(struct bio *bio)
 {
-        return bio_data_dir(bio) == READ || bio_rw_flagged(bio, BIO_RW_SYNCIO);
+        return bio_data_dir(bio) == READ || (bio->bi_rw & REQ_SYNC);
 }
 
 /*
@@ -646,9 +646,10 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2,
                 return rq1;
         else if (rq_is_sync(rq2) && !rq_is_sync(rq1))
                 return rq2;
-        if (rq_is_meta(rq1) && !rq_is_meta(rq2))
+        if ((rq1->cmd_flags & REQ_META) && !(rq2->cmd_flags & REQ_META))
                 return rq1;
-        else if (rq_is_meta(rq2) && !rq_is_meta(rq1))
+        else if ((rq2->cmd_flags & REQ_META) &&
+                 !(rq1->cmd_flags & REQ_META))
                 return rq2;
 
         s1 = blk_rq_pos(rq1);
@@ -1484,7 +1485,7 @@ static void cfq_remove_request(struct request *rq)
         cfqq->cfqd->rq_queued--;
         cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
                                         rq_data_dir(rq), rq_is_sync(rq));
-        if (rq_is_meta(rq)) {
+        if (rq->cmd_flags & REQ_META) {
                 WARN_ON(!cfqq->meta_pending);
                 cfqq->meta_pending--;
         }
@@ -3176,7 +3177,7 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
          * So both queues are sync. Let the new request get disk time if
          * it's a metadata request and the current queue is doing regular IO.
          */
-        if (rq_is_meta(rq) && !cfqq->meta_pending)
+        if ((rq->cmd_flags & REQ_META) && !cfqq->meta_pending)
                 return true;
 
         /*
@@ -3230,7 +3231,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
         struct cfq_io_context *cic = RQ_CIC(rq);
 
         cfqd->rq_queued++;
-        if (rq_is_meta(rq))
+        if (rq->cmd_flags & REQ_META)
                 cfqq->meta_pending++;
 
         cfq_update_io_thinktime(cfqd, cic);
@@ -3365,7 +3366,8 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
         unsigned long now;
 
         now = jiffies;
-        cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", !!rq_noidle(rq));
+        cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d",
+                     !!(rq->cmd_flags & REQ_NOIDLE));
 
         cfq_update_hw_tag(cfqd);
 
@@ -3419,11 +3421,12 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
                         cfq_slice_expired(cfqd, 1);
                 else if (sync && cfqq_empty &&
                          !cfq_close_cooperator(cfqd, cfqq)) {
-                        cfqd->noidle_tree_requires_idle |= !rq_noidle(rq);
+                        cfqd->noidle_tree_requires_idle |=
+                                !(rq->cmd_flags & REQ_NOIDLE);
                         /*
                          * Idling is enabled for SYNC_WORKLOAD.
                          * SYNC_NOIDLE_WORKLOAD idles at the end of the tree
-                         * only if we processed at least one !rq_noidle request
+                         * only if we processed at least one !REQ_NOIDLE request
                          */
                         if (cfqd->serving_type == SYNC_WORKLOAD
                             || cfqd->noidle_tree_requires_idle
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index f26051f44681..d53085637731 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -535,56 +535,6 @@ out:
         return err;
 }
 
-struct compat_blk_user_trace_setup {
-        char name[32];
-        u16 act_mask;
-        u32 buf_size;
-        u32 buf_nr;
-        compat_u64 start_lba;
-        compat_u64 end_lba;
-        u32 pid;
-};
-#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
-
-static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
-{
-        struct blk_user_trace_setup buts;
-        struct compat_blk_user_trace_setup cbuts;
-        struct request_queue *q;
-        char b[BDEVNAME_SIZE];
-        int ret;
-
-        q = bdev_get_queue(bdev);
-        if (!q)
-                return -ENXIO;
-
-        if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
-                return -EFAULT;
-
-        bdevname(bdev, b);
-
-        buts = (struct blk_user_trace_setup) {
-                .act_mask = cbuts.act_mask,
-                .buf_size = cbuts.buf_size,
-                .buf_nr = cbuts.buf_nr,
-                .start_lba = cbuts.start_lba,
-                .end_lba = cbuts.end_lba,
-                .pid = cbuts.pid,
-        };
-        memcpy(&buts.name, &cbuts.name, 32);
-
-        mutex_lock(&bdev->bd_mutex);
-        ret = do_blk_trace_setup(q, b, bdev->bd_dev, bdev, &buts);
-        mutex_unlock(&bdev->bd_mutex);
-        if (ret)
-                return ret;
-
-        if (copy_to_user(arg, &buts.name, 32))
-                return -EFAULT;
-
-        return 0;
-}
-
 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
                         unsigned cmd, unsigned long arg)
 {
@@ -802,16 +752,10 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
                 return compat_put_u64(arg, bdev->bd_inode->i_size);
 
         case BLKTRACESETUP32:
-                lock_kernel();
-                ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
-                unlock_kernel();
-                return ret;
         case BLKTRACESTART: /* compatible */
         case BLKTRACESTOP:  /* compatible */
         case BLKTRACETEARDOWN: /* compatible */
-                lock_kernel();
                 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
-                unlock_kernel();
                 return ret;
         default:
                 if (disk->fops->compat_ioctl)
diff --git a/block/elevator.c b/block/elevator.c
index 923a9139106c..816a7c8d6394 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -79,8 +79,7 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio)
         /*
          * Don't merge file system requests and discard requests
          */
-        if (bio_rw_flagged(bio, BIO_RW_DISCARD) !=
-            bio_rw_flagged(rq->bio, BIO_RW_DISCARD))
+        if ((bio->bi_rw & REQ_DISCARD) != (rq->bio->bi_rw & REQ_DISCARD))
                 return 0;
 
         /*
@@ -428,7 +427,8 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
         list_for_each_prev(entry, &q->queue_head) {
                 struct request *pos = list_entry_rq(entry);
 
-                if (blk_discard_rq(rq) != blk_discard_rq(pos))
+                if ((rq->cmd_flags & REQ_DISCARD) !=
+                    (pos->cmd_flags & REQ_DISCARD))
                         break;
                 if (rq_data_dir(rq) != rq_data_dir(pos))
                         break;
@@ -558,7 +558,7 @@ void elv_requeue_request(struct request_queue *q, struct request *rq)
          */
         if (blk_account_rq(rq)) {
                 q->in_flight[rq_is_sync(rq)]--;
-                if (blk_sorted_rq(rq))
+                if (rq->cmd_flags & REQ_SORTED)
                         elv_deactivate_rq(q, rq);
         }
 
@@ -644,7 +644,8 @@ void elv_insert(struct request_queue *q, struct request *rq, int where)
                 break;
 
         case ELEVATOR_INSERT_SORT:
-                BUG_ON(!blk_fs_request(rq) && !blk_discard_rq(rq));
+                BUG_ON(rq->cmd_type != REQ_TYPE_FS &&
+                       !(rq->cmd_flags & REQ_DISCARD));
                 rq->cmd_flags |= REQ_SORTED;
                 q->nr_sorted++;
                 if (rq_mergeable(rq)) {
@@ -716,7 +717,7 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where,
                 /*
                  * toggle ordered color
                  */
-                if (blk_barrier_rq(rq))
+                if (rq->cmd_flags & REQ_HARDBARRIER)
                         q->ordcolor ^= 1;
 
                 /*
@@ -729,7 +730,8 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where,
                  * this request is scheduling boundary, update
                  * end_sector
                  */
-                if (blk_fs_request(rq) || blk_discard_rq(rq)) {
+                if (rq->cmd_type == REQ_TYPE_FS ||
+                    (rq->cmd_flags & REQ_DISCARD)) {
                         q->end_sector = rq_end_sector(rq);
                         q->boundary_rq = rq;
                 }
@@ -843,7 +845,8 @@ void elv_completed_request(struct request_queue *q, struct request *rq)
          */
         if (blk_account_rq(rq)) {
                 q->in_flight[rq_is_sync(rq)]--;
-                if (blk_sorted_rq(rq) && e->ops->elevator_completed_req_fn)
+                if ((rq->cmd_flags & REQ_SORTED) &&
+                    e->ops->elevator_completed_req_fn)
                         e->ops->elevator_completed_req_fn(q, rq);
         }
 
diff --git a/block/ioctl.c b/block/ioctl.c
index e8eb679f2f9b..09fd7f1ef23a 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -163,18 +163,10 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
                         unsigned cmd, unsigned long arg)
 {
         struct gendisk *disk = bdev->bd_disk;
-        int ret;
 
         if (disk->fops->ioctl)
                 return disk->fops->ioctl(bdev, mode, cmd, arg);
 
-        if (disk->fops->locked_ioctl) {
-                lock_kernel();
-                ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
-                unlock_kernel();
-                return ret;
-        }
-
         return -ENOTTY;
 }
 /*
@@ -185,8 +177,7 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
 
 /*
- * always keep this in sync with compat_blkdev_ioctl() and
- * compat_blkdev_locked_ioctl()
+ * always keep this in sync with compat_blkdev_ioctl()
  */
 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                         unsigned long arg)
@@ -206,10 +197,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                 if (ret != -EINVAL && ret != -ENOTTY)
                         return ret;
 
-                lock_kernel();
                 fsync_bdev(bdev);
                 invalidate_bdev(bdev);
-                unlock_kernel();
                 return 0;
 
         case BLKROSET:
@@ -221,9 +210,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                         return -EACCES;
                 if (get_user(n, (int __user *)(arg)))
                         return -EFAULT;
-                lock_kernel();
                 set_device_ro(bdev, n);
-                unlock_kernel();
                 return 0;
 
         case BLKDISCARD: {
@@ -309,14 +296,10 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                         bd_release(bdev);
                 return ret;
         case BLKPG:
-                lock_kernel();
                 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
-                unlock_kernel();
                 break;
         case BLKRRPART:
-                lock_kernel();
                 ret = blkdev_reread_part(bdev);
-                unlock_kernel();
                 break;
         case BLKGETSIZE:
                 size = bdev->bd_inode->i_size;
@@ -329,9 +312,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
         case BLKTRACESTOP:
         case BLKTRACESETUP:
         case BLKTRACETEARDOWN:
-                lock_kernel();
                 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
-                unlock_kernel();
                 break;
         default:
                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index d75c9c479d1a..a89172c100f5 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1111,10 +1111,10 @@ static void ata_scsi_sdev_config(struct scsi_device *sdev)
  */
 static int atapi_drain_needed(struct request *rq)
 {
-        if (likely(!blk_pc_request(rq)))
+        if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
                 return 0;
 
-        if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW))
+        if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
                 return 0;
 
         return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index c5f22bb0a48e..4e2c367fec11 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -79,23 +79,28 @@ static int DAC960_open(struct block_device *bdev, fmode_t mode)
         struct gendisk *disk = bdev->bd_disk;
         DAC960_Controller_T *p = disk->queue->queuedata;
         int drive_nr = (long)disk->private_data;
+        int ret = -ENXIO;
 
+        lock_kernel();
         if (p->FirmwareType == DAC960_V1_Controller) {
                 if (p->V1.LogicalDriveInformation[drive_nr].
                     LogicalDriveState == DAC960_V1_LogicalDrive_Offline)
-                        return -ENXIO;
+                        goto out;
         } else {
                 DAC960_V2_LogicalDeviceInfo_T *i =
                         p->V2.LogicalDeviceInformation[drive_nr];
                 if (!i || i->LogicalDeviceState == DAC960_V2_LogicalDevice_Offline)
-                        return -ENXIO;
+                        goto out;
         }
 
         check_disk_change(bdev);
 
         if (!get_capacity(p->disks[drive_nr]))
-                return -ENXIO;
-        return 0;
+                goto out;
+        ret = 0;
+out:
+        unlock_kernel();
+        return ret;
 }
 
 static int DAC960_getgeo(struct block_device *bdev, struct hd_geometry *geo)
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 832798aa14f6..76f114f0bba3 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -60,6 +60,7 @@
 #include <linux/hdreg.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/smp_lock.h>
 #include <linux/amifdreg.h>
 #include <linux/amifd.h>
 #include <linux/buffer_head.h>
@@ -1423,7 +1424,7 @@ static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
         return 0;
 }
 
-static int fd_ioctl(struct block_device *bdev, fmode_t mode,
+static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
                     unsigned int cmd, unsigned long param)
 {
         struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
@@ -1500,6 +1501,18 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
         return 0;
 }
 
+static int fd_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long param)
+{
+        int ret;
+
+        lock_kernel();
+        ret = fd_locked_ioctl(bdev, mode, cmd, param);
+        unlock_kernel();
+
+        return ret;
+}
+
 static void fd_probe(int dev)
 {
         unsigned long code;
@@ -1542,10 +1555,13 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         int old_dev;
         unsigned long flags;
 
+        lock_kernel();
         old_dev = fd_device[drive];
 
-        if (fd_ref[drive] && old_dev != system)
+        if (fd_ref[drive] && old_dev != system) {
+                unlock_kernel();
                 return -EBUSY;
+        }
 
         if (mode & (FMODE_READ|FMODE_WRITE)) {
                 check_disk_change(bdev);
@@ -1558,8 +1574,10 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
                         fd_deselect (drive);
                         rel_fdc();
 
-                        if (wrprot)
+                        if (wrprot) {
+                                unlock_kernel();
                                 return -EROFS;
+                        }
                 }
         }
 
@@ -1576,6 +1594,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
                unit[drive].type->name, data_types[system].name);
 
+        unlock_kernel();
         return 0;
 }
 
@@ -1584,6 +1603,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
         struct amiga_floppy_struct *p = disk->private_data;
         int drive = p - unit;
 
+        lock_kernel();
         if (unit[drive].dirty == 1) {
                 del_timer (flush_track_timer + drive);
                 non_int_flush_track (drive);
@@ -1597,6 +1617,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 /* the mod_use counter is handled this way */
         floppy_off (drive | 0x40000000);
 #endif
+        unlock_kernel();
         return 0;
 }
 
@@ -1638,7 +1659,7 @@ static const struct block_device_operations floppy_fops = {
         .owner          = THIS_MODULE,
         .open           = floppy_open,
         .release        = floppy_release,
-        .locked_ioctl   = fd_ioctl,
+        .ioctl          = fd_ioctl,
         .getgeo         = fd_getgeo,
         .media_changed  = amiga_floppy_change,
 };
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 035cefe4045a..a946929735a5 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 #include <linux/genhd.h>
 #include <linux/netdevice.h>
+#include <linux/smp_lock.h>
 #include "aoe.h"
 
 static struct kmem_cache *buf_pool_cache;
@@ -124,13 +125,16 @@ aoeblk_open(struct block_device *bdev, fmode_t mode)
         struct aoedev *d = bdev->bd_disk->private_data;
         ulong flags;
 
+        lock_kernel();
         spin_lock_irqsave(&d->lock, flags);
         if (d->flags & DEVFL_UP) {
                 d->nopen++;
                 spin_unlock_irqrestore(&d->lock, flags);
+                unlock_kernel();
                 return 0;
         }
         spin_unlock_irqrestore(&d->lock, flags);
+        unlock_kernel();
         return -ENODEV;
 }
 
@@ -173,7 +177,7 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
                 BUG();
                 bio_endio(bio, -ENXIO);
                 return 0;
-        } else if (bio_rw_flagged(bio, BIO_RW_BARRIER)) {
+        } else if (bio->bi_rw & REQ_HARDBARRIER) {
                 bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         } else if (bio->bi_io_vec == NULL) {
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index e35cf59cbfde..aceb96476524 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -67,6 +67,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 
 #include <asm/atafd.h>
 #include <asm/atafdreg.h>
@@ -359,7 +360,7 @@ static void finish_fdc( void );
 static void finish_fdc_done( int dummy );
 static void setup_req_params( int drive );
 static void redo_fd_request( void);
-static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
+static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
                      cmd, unsigned long param);
 static void fd_probe( int drive );
 static int fd_test_drive_present( int drive );
@@ -1480,7 +1481,7 @@ void do_fd_request(struct request_queue * q)
         atari_enable_irq( IRQ_MFP_FDC );
 }
 
-static int fd_ioctl(struct block_device *bdev, fmode_t mode,
+static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
                     unsigned int cmd, unsigned long param)
 {
         struct gendisk *disk = bdev->bd_disk;
@@ -1665,6 +1666,17 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
         }
 }
 
+static int fd_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long arg)
+{
+        int ret;
+
+        lock_kernel();
+        ret = fd_locked_ioctl(bdev, mode, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}
 
 /* Initialize the 'unit' variable for drive 'drive' */
 
@@ -1838,24 +1850,36 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         return 0;
 }
 
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = floppy_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
 
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         struct atari_floppy_struct *p = disk->private_data;
+        lock_kernel();
         if (p->ref < 0)
                 p->ref = 0;
         else if (!p->ref--) {
                 printk(KERN_ERR "floppy_release with fd_ref == 0");
                 p->ref = 0;
         }
+        unlock_kernel();
         return 0;
 }
 
 static const struct block_device_operations floppy_fops = {
         .owner          = THIS_MODULE,
-        .open           = floppy_open,
+        .open           = floppy_unlocked_open,
         .release        = floppy_release,
-        .locked_ioctl   = fd_ioctl,
+        .ioctl          = fd_ioctl,
         .media_changed  = check_floppy_change,
         .revalidate_disk= floppy_revalidate,
 };
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index f1bf79d9bc0a..1c7f63792ff8 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -15,6 +15,7 @@
 #include <linux/blkdev.h>
 #include <linux/bio.h>
 #include <linux/highmem.h>
+#include <linux/smp_lock.h>
 #include <linux/radix-tree.h>
 #include <linux/buffer_head.h> /* invalidate_bh_lrus() */
 #include <linux/slab.h>
@@ -340,7 +341,7 @@ static int brd_make_request(struct request_queue *q, struct bio *bio)
                                                 get_capacity(bdev->bd_disk))
                 goto out;
 
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_DISCARD))) {
+        if (unlikely(bio->bi_rw & REQ_DISCARD)) {
                 err = 0;
                 discard_from_brd(brd, sector, bio->bi_size);
                 goto out;
@@ -401,6 +402,7 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
          * ram device BLKFLSBUF has special semantics, we want to actually
          * release and destroy the ramdisk data.
          */
+        lock_kernel();
         mutex_lock(&bdev->bd_mutex);
         error = -EBUSY;
         if (bdev->bd_openers <= 1) {
@@ -417,13 +419,14 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
                 error = 0;
         }
         mutex_unlock(&bdev->bd_mutex);
+        unlock_kernel();
 
         return error;
 }
 
 static const struct block_device_operations brd_fops = {
         .owner =                THIS_MODULE,
-        .locked_ioctl =         brd_ioctl,
+        .ioctl =                brd_ioctl,
 #ifdef CONFIG_BLK_DEV_XIP
         .direct_access =        brd_direct_access,
 #endif
@@ -479,7 +482,7 @@ static struct brd_device *brd_alloc(int i)
         if (!brd->brd_queue)
                 goto out_free_dev;
         blk_queue_make_request(brd->brd_queue, brd_make_request);
-        blk_queue_ordered(brd->brd_queue, QUEUE_ORDERED_TAG, NULL);
+        blk_queue_ordered(brd->brd_queue, QUEUE_ORDERED_TAG);
         blk_queue_max_hw_sectors(brd->brd_queue, 1024);
         blk_queue_bounce_limit(brd->brd_queue, BLK_BOUNCE_ANY);
 
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index e1e7143ca1e3..31064df1370a 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -56,16 +56,14 @@
 #include <linux/kthread.h>
 
 #define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
-#define DRIVER_NAME "HP CISS Driver (v 3.6.20)"
-#define DRIVER_VERSION CCISS_DRIVER_VERSION(3, 6, 20)
+#define DRIVER_NAME "HP CISS Driver (v 3.6.26)"
+#define DRIVER_VERSION CCISS_DRIVER_VERSION(3, 6, 26)
 
 /* Embedded module documentation macros - see modules.h */
 MODULE_AUTHOR("Hewlett-Packard Company");
 MODULE_DESCRIPTION("Driver for HP Smart Array Controllers");
-MODULE_SUPPORTED_DEVICE("HP SA5i SA5i+ SA532 SA5300 SA5312 SA641 SA642 SA6400"
-                        " SA6i P600 P800 P400 P400i E200 E200i E500 P700m"
-                        " Smart Array G2 Series SAS/SATA Controllers");
-MODULE_VERSION("3.6.20");
+MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
+MODULE_VERSION("3.6.26");
 MODULE_LICENSE("GPL");
 
 static int cciss_allow_hpsa;
@@ -107,6 +105,11 @@ static const struct pci_device_id cciss_pci_device_id[] = {
         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3249},
         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324A},
         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324B},
+        {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3250},
+        {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3251},
+        {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3252},
+        {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3253},
+        {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3254},
         {0,}
 };
 
@@ -146,6 +149,11 @@ static struct board_type products[] = {
         {0x3249103C, "Smart Array P812", &SA5_access},
         {0x324A103C, "Smart Array P712m", &SA5_access},
         {0x324B103C, "Smart Array P711m", &SA5_access},
+        {0x3250103C, "Smart Array", &SA5_access},
+        {0x3251103C, "Smart Array", &SA5_access},
+        {0x3252103C, "Smart Array", &SA5_access},
+        {0x3253103C, "Smart Array", &SA5_access},
+        {0x3254103C, "Smart Array", &SA5_access},
 };
 
 /* How long to wait (in milliseconds) for board to go into simple mode */
@@ -167,9 +175,13 @@ static DEFINE_MUTEX(scan_mutex);
 static LIST_HEAD(scan_q);
 
 static void do_cciss_request(struct request_queue *q);
-static irqreturn_t do_cciss_intr(int irq, void *dev_id);
+static irqreturn_t do_cciss_intx(int irq, void *dev_id);
+static irqreturn_t do_cciss_msix_intr(int irq, void *dev_id);
 static int cciss_open(struct block_device *bdev, fmode_t mode);
+static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode);
 static int cciss_release(struct gendisk *disk, fmode_t mode);
+static int do_ioctl(struct block_device *bdev, fmode_t mode,
+                    unsigned int cmd, unsigned long arg);
 static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                        unsigned int cmd, unsigned long arg);
 static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo);
@@ -179,25 +191,23 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time, int via_ioctl);
 static int deregister_disk(ctlr_info_t *h, int drv_index,
                            int clear_all, int via_ioctl);
 
-static void cciss_read_capacity(int ctlr, int logvol,
+static void cciss_read_capacity(ctlr_info_t *h, int logvol,
                         sector_t *total_size, unsigned int *block_size);
-static void cciss_read_capacity_16(int ctlr, int logvol,
+static void cciss_read_capacity_16(ctlr_info_t *h, int logvol,
                         sector_t *total_size, unsigned int *block_size);
-static void cciss_geometry_inquiry(int ctlr, int logvol,
+static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
                         sector_t total_size,
                         unsigned int block_size, InquiryData_struct *inq_buff,
                                    drive_info_struct *drv);
-static void __devinit cciss_interrupt_mode(ctlr_info_t *, struct pci_dev *,
-                                           __u32);
+static void __devinit cciss_interrupt_mode(ctlr_info_t *);
 static void start_io(ctlr_info_t *h);
-static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
+static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
                         __u8 page_code, unsigned char scsi3addr[],
                         int cmd_type);
 static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c,
         int attempt_retry);
 static int process_sendcmd_error(ctlr_info_t *h, CommandList_struct *c);
 
-static void fail_all_cmds(unsigned long ctlr);
 static int add_to_scan_list(struct ctlr_info *h);
 static int scan_thread(void *data);
 static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c);
@@ -205,11 +215,23 @@ static void cciss_hba_release(struct device *dev);
 static void cciss_device_release(struct device *dev);
 static void cciss_free_gendisk(ctlr_info_t *h, int drv_index);
 static void cciss_free_drive_info(ctlr_info_t *h, int drv_index);
+static inline u32 next_command(ctlr_info_t *h);
+static int __devinit cciss_find_cfg_addrs(struct pci_dev *pdev,
+        void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
+        u64 *cfg_offset);
+static int __devinit cciss_pci_find_memory_BAR(struct pci_dev *pdev,
+        unsigned long *memory_bar);
+
+
+/* performant mode helper functions */
+static void  calc_bucket_map(int *bucket, int num_buckets, int nsgs,
+                                int *bucket_map);
+static void cciss_put_controller_into_performant_mode(ctlr_info_t *h);
 
 #ifdef CONFIG_PROC_FS
-static void cciss_procinit(int i);
+static void cciss_procinit(ctlr_info_t *h);
 #else
-static void cciss_procinit(int i)
+static void cciss_procinit(ctlr_info_t *h)
 {
 }
 #endif                          /* CONFIG_PROC_FS */
@@ -221,9 +243,9 @@ static int cciss_compat_ioctl(struct block_device *, fmode_t,
 
 static const struct block_device_operations cciss_fops = {
         .owner = THIS_MODULE,
-        .open = cciss_open,
+        .open = cciss_unlocked_open,
         .release = cciss_release,
-        .locked_ioctl = cciss_ioctl,
+        .ioctl = do_ioctl,
         .getgeo = cciss_getgeo,
 #ifdef CONFIG_COMPAT
         .compat_ioctl = cciss_compat_ioctl,
@@ -231,6 +253,16 @@ static const struct block_device_operations cciss_fops = {
         .revalidate_disk = cciss_revalidate,
 };
 
+/* set_performant_mode: Modify the tag for cciss performant
+ * set bit 0 for pull model, bits 3-1 for block fetch
+ * register number
+ */
+static void set_performant_mode(ctlr_info_t *h, CommandList_struct *c)
+{
+        if (likely(h->transMethod == CFGTBL_Trans_Performant))
+                c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
+}
+
 /*
  * Enqueuing and dequeuing functions for cmdlists.
  */
@@ -257,6 +289,18 @@ static inline void removeQ(CommandList_struct *c)
         hlist_del_init(&c->list);
 }
 
+static void enqueue_cmd_and_start_io(ctlr_info_t *h,
+        CommandList_struct *c)
+{
+        unsigned long flags;
+        set_performant_mode(h, c);
+        spin_lock_irqsave(&h->lock, flags);
+        addQ(&h->reqQ, c);
+        h->Qdepth++;
+        start_io(h);
+        spin_unlock_irqrestore(&h->lock, flags);
+}
+
 static void cciss_free_sg_chain_blocks(SGDescriptor_struct **cmd_sg_list,
         int nr_cmds)
 {
@@ -366,32 +410,31 @@ static void cciss_seq_show_header(struct seq_file *seq)
                 h->product_name,
                 (unsigned long)h->board_id,
                 h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
-                h->firm_ver[3], (unsigned int)h->intr[SIMPLE_MODE_INT],
+                h->firm_ver[3], (unsigned int)h->intr[PERF_MODE_INT],
                 h->num_luns,
                 h->Qdepth, h->commands_outstanding,
                 h->maxQsinceinit, h->max_outstanding, h->maxSG);
 
 #ifdef CONFIG_CISS_SCSI_TAPE
-        cciss_seq_tape_report(seq, h->ctlr);
+        cciss_seq_tape_report(seq, h);
 #endif /* CONFIG_CISS_SCSI_TAPE */
 }
 
 static void *cciss_seq_start(struct seq_file *seq, loff_t *pos)
 {
         ctlr_info_t *h = seq->private;
-        unsigned ctlr = h->ctlr;
         unsigned long flags;
 
         /* prevent displaying bogus info during configuration
          * or deconfiguration of a logical volume
          */
-        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring) {
-                spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 return ERR_PTR(-EBUSY);
         }
         h->busy_configuring = 1;
-        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
 
         if (*pos == 0)
                 cciss_seq_show_header(seq);
@@ -499,7 +542,7 @@ cciss_proc_write(struct file *file, const char __user *buf,
                 struct seq_file *seq = file->private_data;
                 ctlr_info_t *h = seq->private;
 
-                err = cciss_engage_scsi(h->ctlr);
+                err = cciss_engage_scsi(h);
                 if (err == 0)
                         err = length;
         } else
@@ -522,7 +565,7 @@ static const struct file_operations cciss_proc_fops = {
         .write   = cciss_proc_write,
 };
 
-static void __devinit cciss_procinit(int i)
+static void __devinit cciss_procinit(ctlr_info_t *h)
 {
         struct proc_dir_entry *pde;
 
@@ -530,9 +573,9 @@ static void __devinit cciss_procinit(int i)
                 proc_cciss = proc_mkdir("driver/cciss", NULL);
         if (!proc_cciss)
                 return;
-        pde = proc_create_data(hba[i]->devname, S_IWUSR | S_IRUSR | S_IRGRP |
+        pde = proc_create_data(h->devname, S_IWUSR | S_IRUSR | S_IRGRP |
                                         S_IROTH, proc_cciss,
-                                        &cciss_proc_fops, hba[i]);
+                                        &cciss_proc_fops, h);
 }
 #endif                          /* CONFIG_PROC_FS */
 
@@ -565,12 +608,12 @@ static ssize_t dev_show_unique_id(struct device *dev,
         unsigned long flags;
         int ret = 0;
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring)
                 ret = -EBUSY;
         else
                 memcpy(sn, drv->serial_no, sizeof(sn));
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
 
         if (ret)
                 return ret;
@@ -595,12 +638,12 @@ static ssize_t dev_show_vendor(struct device *dev,
         unsigned long flags;
         int ret = 0;
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring)
                 ret = -EBUSY;
         else
                 memcpy(vendor, drv->vendor, VENDOR_LEN + 1);
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
 
         if (ret)
                 return ret;
@@ -619,12 +662,12 @@ static ssize_t dev_show_model(struct device *dev,
         unsigned long flags;
         int ret = 0;
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring)
                 ret = -EBUSY;
         else
                 memcpy(model, drv->model, MODEL_LEN + 1);
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
 
         if (ret)
                 return ret;
@@ -643,12 +686,12 @@ static ssize_t dev_show_rev(struct device *dev,
         unsigned long flags;
         int ret = 0;
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring)
                 ret = -EBUSY;
         else
                 memcpy(rev, drv->rev, REV_LEN + 1);
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
 
         if (ret)
                 return ret;
@@ -665,17 +708,17 @@ static ssize_t cciss_show_lunid(struct device *dev,
         unsigned long flags;
         unsigned char lunid[8];
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring) {
-                spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 return -EBUSY;
         }
         if (!drv->heads) {
-                spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 return -ENOTTY;
         }
         memcpy(lunid, drv->LunID, sizeof(lunid));
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
         return snprintf(buf, 20, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
                 lunid[0], lunid[1], lunid[2], lunid[3],
                 lunid[4], lunid[5], lunid[6], lunid[7]);
@@ -690,13 +733,13 @@ static ssize_t cciss_show_raid_level(struct device *dev,
         int raid;
         unsigned long flags;
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring) {
-                spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 return -EBUSY;
         }
         raid = drv->raid_level;
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
         if (raid < 0 || raid > RAID_UNKNOWN)
                 raid = RAID_UNKNOWN;
 
@@ -713,13 +756,13 @@ static ssize_t cciss_show_usage_count(struct device *dev,
         unsigned long flags;
         int count;
 
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring) {
-                spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 return -EBUSY;
         }
         count = drv->usage_count;
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
         return snprintf(buf, 20, "%d\n", count);
 }
 static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);
@@ -864,60 +907,70 @@ static void cciss_destroy_ld_sysfs_entry(struct ctlr_info *h, int drv_index,
 /*
  * For operations that cannot sleep, a command block is allocated at init,
  * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
- * which ones are free or in use.  For operations that can wait for kmalloc
- * to possible sleep, this routine can be called with get_from_pool set to 0.
- * cmd_free() MUST be called with a got_from_pool set to 0 if cmd_alloc was.
+ * which ones are free or in use.
  */
-static CommandList_struct *cmd_alloc(ctlr_info_t *h, int get_from_pool)
+static CommandList_struct *cmd_alloc(ctlr_info_t *h)
 {
         CommandList_struct *c;
         int i;
         u64bit temp64;
         dma_addr_t cmd_dma_handle, err_dma_handle;
 
-        if (!get_from_pool) {
-                c = (CommandList_struct *) pci_alloc_consistent(h->pdev,
-                        sizeof(CommandList_struct), &cmd_dma_handle);
-                if (c == NULL)
+        do {
+                i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
+                if (i == h->nr_cmds)
                         return NULL;
-                memset(c, 0, sizeof(CommandList_struct));
+        } while (test_and_set_bit(i & (BITS_PER_LONG - 1),
+                  h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
+        c = h->cmd_pool + i;
+        memset(c, 0, sizeof(CommandList_struct));
+        cmd_dma_handle = h->cmd_pool_dhandle + i * sizeof(CommandList_struct);
+        c->err_info = h->errinfo_pool + i;
+        memset(c->err_info, 0, sizeof(ErrorInfo_struct));
+        err_dma_handle = h->errinfo_pool_dhandle
+            + i * sizeof(ErrorInfo_struct);
+        h->nr_allocs++;
 
-                c->cmdindex = -1;
+        c->cmdindex = i;
 
-                c->err_info = (ErrorInfo_struct *)
-                    pci_alloc_consistent(h->pdev, sizeof(ErrorInfo_struct),
-                            &err_dma_handle);
+        INIT_HLIST_NODE(&c->list);
+        c->busaddr = (__u32) cmd_dma_handle;
+        temp64.val = (__u64) err_dma_handle;
+        c->ErrDesc.Addr.lower = temp64.val32.lower;
+        c->ErrDesc.Addr.upper = temp64.val32.upper;
+        c->ErrDesc.Len = sizeof(ErrorInfo_struct);
 
-                if (c->err_info == NULL) {
-                        pci_free_consistent(h->pdev,
-                                sizeof(CommandList_struct), c, cmd_dma_handle);
-                        return NULL;
-                }
-                memset(c->err_info, 0, sizeof(ErrorInfo_struct));
-        } else {                /* get it out of the controllers pool */
-
-                do {
-                        i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
-                        if (i == h->nr_cmds)
-                                return NULL;
-                } while (test_and_set_bit
-                         (i & (BITS_PER_LONG - 1),
-                          h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
-#ifdef CCISS_DEBUG
-                printk(KERN_DEBUG "cciss: using command buffer %d\n", i);
-#endif
-                c = h->cmd_pool + i;
-                memset(c, 0, sizeof(CommandList_struct));
-                cmd_dma_handle = h->cmd_pool_dhandle
-                    + i * sizeof(CommandList_struct);
-                c->err_info = h->errinfo_pool + i;
-                memset(c->err_info, 0, sizeof(ErrorInfo_struct));
-                err_dma_handle = h->errinfo_pool_dhandle
-                    + i * sizeof(ErrorInfo_struct);
-                h->nr_allocs++;
+        c->ctlr = h->ctlr;
+        return c;
+}
 
-                c->cmdindex = i;
+/* allocate a command using pci_alloc_consistent, used for ioctls,
+ * etc., not for the main i/o path.
+ */
+static CommandList_struct *cmd_special_alloc(ctlr_info_t *h)
+{
+        CommandList_struct *c;
+        u64bit temp64;
+        dma_addr_t cmd_dma_handle, err_dma_handle;
+
+        c = (CommandList_struct *) pci_alloc_consistent(h->pdev,
+                sizeof(CommandList_struct), &cmd_dma_handle);
+        if (c == NULL)
+                return NULL;
+        memset(c, 0, sizeof(CommandList_struct));
+
+        c->cmdindex = -1;
+
+        c->err_info = (ErrorInfo_struct *)
+            pci_alloc_consistent(h->pdev, sizeof(ErrorInfo_struct),
+                    &err_dma_handle);
+
+        if (c->err_info == NULL) {
+                pci_free_consistent(h->pdev,
+                        sizeof(CommandList_struct), c, cmd_dma_handle);
+                return NULL;
         }
+        memset(c->err_info, 0, sizeof(ErrorInfo_struct));
 
         INIT_HLIST_NODE(&c->list);
         c->busaddr = (__u32) cmd_dma_handle;
@@ -930,27 +983,26 @@ static CommandList_struct *cmd_alloc(ctlr_info_t *h, int get_from_pool)
         return c;
 }
 
-/*
- * Frees a command block that was previously allocated with cmd_alloc().
- */
-static void cmd_free(ctlr_info_t *h, CommandList_struct *c, int got_from_pool)
+static void cmd_free(ctlr_info_t *h, CommandList_struct *c)
 {
         int i;
+
+        i = c - h->cmd_pool;
+        clear_bit(i & (BITS_PER_LONG - 1),
+                  h->cmd_pool_bits + (i / BITS_PER_LONG));
+        h->nr_frees++;
+}
+
+static void cmd_special_free(ctlr_info_t *h, CommandList_struct *c)
+{
         u64bit temp64;
 
-        if (!got_from_pool) {
-                temp64.val32.lower = c->ErrDesc.Addr.lower;
-                temp64.val32.upper = c->ErrDesc.Addr.upper;
-                pci_free_consistent(h->pdev, sizeof(ErrorInfo_struct),
-                                    c->err_info, (dma_addr_t) temp64.val);
-                pci_free_consistent(h->pdev, sizeof(CommandList_struct),
-                                    c, (dma_addr_t) c->busaddr);
-        } else {
-                i = c - h->cmd_pool;
-                clear_bit(i & (BITS_PER_LONG - 1),
-                          h->cmd_pool_bits + (i / BITS_PER_LONG));
-                h->nr_frees++;
-        }
+        temp64.val32.lower = c->ErrDesc.Addr.lower;
+        temp64.val32.upper = c->ErrDesc.Addr.upper;
+        pci_free_consistent(h->pdev, sizeof(ErrorInfo_struct),
+                            c->err_info, (dma_addr_t) temp64.val);
+        pci_free_consistent(h->pdev, sizeof(CommandList_struct),
+                            c, (dma_addr_t) c->busaddr);
 }
 
 static inline ctlr_info_t *get_host(struct gendisk *disk)
@@ -968,13 +1020,10 @@ static inline drive_info_struct *get_drv(struct gendisk *disk)
  */
 static int cciss_open(struct block_device *bdev, fmode_t mode)
 {
-        ctlr_info_t *host = get_host(bdev->bd_disk);
+        ctlr_info_t *h = get_host(bdev->bd_disk);
         drive_info_struct *drv = get_drv(bdev->bd_disk);
 
-#ifdef CCISS_DEBUG
-        printk(KERN_DEBUG "cciss_open %s\n", bdev->bd_disk->disk_name);
-#endif                          /* CCISS_DEBUG */
-
+        dev_dbg(&h->pdev->dev, "cciss_open %s\n", bdev->bd_disk->disk_name);
         if (drv->busy_configuring)
                 return -EBUSY;
         /*
@@ -1000,29 +1049,39 @@ static int cciss_open(struct block_device *bdev, fmode_t mode)
                         return -EPERM;
         }
         drv->usage_count++;
-        host->usage_count++;
+        h->usage_count++;
         return 0;
 }
 
+static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = cciss_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
 /*
  * Close.  Sync first.
  */
 static int cciss_release(struct gendisk *disk, fmode_t mode)
 {
-        ctlr_info_t *host = get_host(disk);
-        drive_info_struct *drv = get_drv(disk);
-
-#ifdef CCISS_DEBUG
-        printk(KERN_DEBUG "cciss_release %s\n", disk->disk_name);
-#endif                          /* CCISS_DEBUG */
+        ctlr_info_t *h;
+        drive_info_struct *drv;
 
+        lock_kernel();
+        h = get_host(disk);
+        drv = get_drv(disk);
+        dev_dbg(&h->pdev->dev, "cciss_release %s\n", disk->disk_name);
         drv->usage_count--;
-        host->usage_count--;
+        h->usage_count--;
+        unlock_kernel();
         return 0;
 }
 
-#ifdef CONFIG_COMPAT
-
 static int do_ioctl(struct block_device *bdev, fmode_t mode,
                     unsigned cmd, unsigned long arg)
 {
@@ -1033,6 +1092,8 @@ static int do_ioctl(struct block_device *bdev, fmode_t mode,
         return ret;
 }
 
+#ifdef CONFIG_COMPAT
+
 static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
                                   unsigned cmd, unsigned long arg);
 static int cciss_ioctl32_big_passthru(struct block_device *bdev, fmode_t mode,
@@ -1163,11 +1224,11 @@ static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo)
         return 0;
 }
 
-static void check_ioctl_unit_attention(ctlr_info_t *host, CommandList_struct *c)
+static void check_ioctl_unit_attention(ctlr_info_t *h, CommandList_struct *c)
 {
         if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
                         c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
-                (void)check_for_unit_attention(host, c);
+                (void)check_for_unit_attention(h, c);
 }
 /*
  * ioctl
@@ -1176,15 +1237,12 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                        unsigned int cmd, unsigned long arg)
 {
         struct gendisk *disk = bdev->bd_disk;
-        ctlr_info_t *host = get_host(disk);
+        ctlr_info_t *h = get_host(disk);
         drive_info_struct *drv = get_drv(disk);
-        int ctlr = host->ctlr;
         void __user *argp = (void __user *)arg;
 
-#ifdef CCISS_DEBUG
-        printk(KERN_DEBUG "cciss_ioctl: Called with cmd=%x %lx\n", cmd, arg);
-#endif                          /* CCISS_DEBUG */
-
+        dev_dbg(&h->pdev->dev, "cciss_ioctl: Called with cmd=%x %lx\n",
+                cmd, arg);
         switch (cmd) {
         case CCISS_GETPCIINFO:
                 {
@@ -1192,10 +1250,10 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
 
                         if (!arg)
                                 return -EINVAL;
-                        pciinfo.domain = pci_domain_nr(host->pdev->bus);
-                        pciinfo.bus = host->pdev->bus->number;
-                        pciinfo.dev_fn = host->pdev->devfn;
-                        pciinfo.board_id = host->board_id;
+                        pciinfo.domain = pci_domain_nr(h->pdev->bus);
+                        pciinfo.bus = h->pdev->bus->number;
+                        pciinfo.dev_fn = h->pdev->devfn;
+                        pciinfo.board_id = h->board_id;
                         if (copy_to_user
                             (argp, &pciinfo, sizeof(cciss_pci_info_struct)))
                                 return -EFAULT;
@@ -1207,9 +1265,9 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                         if (!arg)
                                 return -EINVAL;
                         intinfo.delay =
-                            readl(&host->cfgtable->HostWrite.CoalIntDelay);
+                            readl(&h->cfgtable->HostWrite.CoalIntDelay);
                         intinfo.count =
-                            readl(&host->cfgtable->HostWrite.CoalIntCount);
+                            readl(&h->cfgtable->HostWrite.CoalIntCount);
                         if (copy_to_user
                             (argp, &intinfo, sizeof(cciss_coalint_struct)))
                                 return -EFAULT;
@@ -1229,26 +1287,23 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                             (&intinfo, argp, sizeof(cciss_coalint_struct)))
                                 return -EFAULT;
                         if ((intinfo.delay == 0) && (intinfo.count == 0))
-                        {
-//                      printk("cciss_ioctl: delay and count cannot be 0\n");
                                 return -EINVAL;
-                        }
-                        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
+                        spin_lock_irqsave(&h->lock, flags);
                         /* Update the field, and then ring the doorbell */
                         writel(intinfo.delay,
-                               &(host->cfgtable->HostWrite.CoalIntDelay));
+                               &(h->cfgtable->HostWrite.CoalIntDelay));
                         writel(intinfo.count,
-                               &(host->cfgtable->HostWrite.CoalIntCount));
-                        writel(CFGTBL_ChangeReq, host->vaddr + SA5_DOORBELL);
+                               &(h->cfgtable->HostWrite.CoalIntCount));
+                        writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
 
                         for (i = 0; i < MAX_IOCTL_CONFIG_WAIT; i++) {
-                                if (!(readl(host->vaddr + SA5_DOORBELL)
+                                if (!(readl(h->vaddr + SA5_DOORBELL)
                                       & CFGTBL_ChangeReq))
                                         break;
                                 /* delay and try again */
                                 udelay(1000);
                         }
-                        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+                        spin_unlock_irqrestore(&h->lock, flags);
                         if (i >= MAX_IOCTL_CONFIG_WAIT)
                                 return -EAGAIN;
                         return 0;
@@ -1262,7 +1317,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                                 return -EINVAL;
                         for (i = 0; i < 16; i++)
                                 NodeName[i] =
-                                    readb(&host->cfgtable->ServerName[i]);
+                                    readb(&h->cfgtable->ServerName[i]);
                         if (copy_to_user(argp, NodeName, sizeof(NodeName_type)))
                                 return -EFAULT;
                         return 0;
@@ -1282,23 +1337,23 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                             (NodeName, argp, sizeof(NodeName_type)))
                                 return -EFAULT;
 
-                        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
+                        spin_lock_irqsave(&h->lock, flags);
 
                         /* Update the field, and then ring the doorbell */
                         for (i = 0; i < 16; i++)
                                 writeb(NodeName[i],
-                                       &host->cfgtable->ServerName[i]);
+                                       &h->cfgtable->ServerName[i]);
 
-                        writel(CFGTBL_ChangeReq, host->vaddr + SA5_DOORBELL);
+                        writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
 
                         for (i = 0; i < MAX_IOCTL_CONFIG_WAIT; i++) {
-                                if (!(readl(host->vaddr + SA5_DOORBELL)
+                                if (!(readl(h->vaddr + SA5_DOORBELL)
                                       & CFGTBL_ChangeReq))
                                         break;
                                 /* delay and try again */
                                 udelay(1000);
                         }
-                        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+                        spin_unlock_irqrestore(&h->lock, flags);
                         if (i >= MAX_IOCTL_CONFIG_WAIT)
                                 return -EAGAIN;
                         return 0;
@@ -1310,7 +1365,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
 
                         if (!arg)
                                 return -EINVAL;
-                        heartbeat = readl(&host->cfgtable->HeartBeat);
+                        heartbeat = readl(&h->cfgtable->HeartBeat);
                         if (copy_to_user
                             (argp, &heartbeat, sizeof(Heartbeat_type)))
                                 return -EFAULT;
@@ -1322,7 +1377,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
 
                         if (!arg)
                                 return -EINVAL;
-                        BusTypes = readl(&host->cfgtable->BusTypes);
+                        BusTypes = readl(&h->cfgtable->BusTypes);
                         if (copy_to_user
                             (argp, &BusTypes, sizeof(BusTypes_type)))
                                 return -EFAULT;
@@ -1334,7 +1389,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
 
                         if (!arg)
                                 return -EINVAL;
-                        memcpy(firmware, host->firm_ver, 4);
+                        memcpy(firmware, h->firm_ver, 4);
 
                         if (copy_to_user
                             (argp, firmware, sizeof(FirmwareVer_type)))
@@ -1357,7 +1412,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
         case CCISS_DEREGDISK:
         case CCISS_REGNEWD:
         case CCISS_REVALIDVOLS:
-                return rebuild_lun_table(host, 0, 1);
+                return rebuild_lun_table(h, 0, 1);
 
         case CCISS_GETLUNINFO:{
                         LogvolInfo_struct luninfo;
@@ -1377,7 +1432,6 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                         CommandList_struct *c;
                         char *buff = NULL;
                         u64bit temp64;
-                        unsigned long flags;
                         DECLARE_COMPLETION_ONSTACK(wait);
 
                         if (!arg)
@@ -1413,7 +1467,8 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                         } else {
                                 memset(buff, 0, iocommand.buf_size);
                         }
-                        if ((c = cmd_alloc(host, 0)) == NULL) {
+                        c = cmd_special_alloc(h);
+                        if (!c) {
                                 kfree(buff);
                                 return -ENOMEM;
                         }
@@ -1439,7 +1494,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
 
                         /* Fill in the scatter gather information */
                         if (iocommand.buf_size > 0) {
-                                temp64.val = pci_map_single(host->pdev, buff,
+                                temp64.val = pci_map_single(h->pdev, buff,
                                         iocommand.buf_size,
                                         PCI_DMA_BIDIRECTIONAL);
                                 c->SG[0].Addr.lower = temp64.val32.lower;
@@ -1449,30 +1504,24 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                         }
                         c->waiting = &wait;
 
-                        /* Put the request on the tail of the request queue */
-                        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-                        addQ(&host->reqQ, c);
-                        host->Qdepth++;
-                        start_io(host);
-                        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-
+                        enqueue_cmd_and_start_io(h, c);
                         wait_for_completion(&wait);
 
                         /* unlock the buffers from DMA */
                         temp64.val32.lower = c->SG[0].Addr.lower;
                         temp64.val32.upper = c->SG[0].Addr.upper;
-                        pci_unmap_single(host->pdev, (dma_addr_t) temp64.val,
+                        pci_unmap_single(h->pdev, (dma_addr_t) temp64.val,
                                          iocommand.buf_size,
                                          PCI_DMA_BIDIRECTIONAL);
 
-                        check_ioctl_unit_attention(host, c);
+                        check_ioctl_unit_attention(h, c);
 
                         /* Copy the error information out */
                         iocommand.error_info = *(c->err_info);
                         if (copy_to_user
                             (argp, &iocommand, sizeof(IOCTL_Command_struct))) {
                                 kfree(buff);
-                                cmd_free(host, c, 0);
+                                cmd_special_free(h, c);
                                 return -EFAULT;
                         }
 
@@ -1481,12 +1530,12 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                                 if (copy_to_user
                                     (iocommand.buf, buff, iocommand.buf_size)) {
                                         kfree(buff);
-                                        cmd_free(host, c, 0);
+                                        cmd_special_free(h, c);
                                         return -EFAULT;
                                 }
                         }
                         kfree(buff);
-                        cmd_free(host, c, 0);
+                        cmd_special_free(h, c);
                         return 0;
                 }
         case CCISS_BIG_PASSTHRU:{
@@ -1495,7 +1544,6 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                         unsigned char **buff = NULL;
                         int *buff_size = NULL;
                         u64bit temp64;
-                        unsigned long flags;
                         BYTE sg_used = 0;
                         int status = 0;
                         int i;
@@ -1569,7 +1617,8 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                                 data_ptr += sz;
                                 sg_used++;
                         }
-                        if ((c = cmd_alloc(host, 0)) == NULL) {
+                        c = cmd_special_alloc(h);
+                        if (!c) {
                                 status = -ENOMEM;
                                 goto cleanup1;
                         }
@@ -1590,7 +1639,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                         if (ioc->buf_size > 0) {
                                 for (i = 0; i < sg_used; i++) {
                                         temp64.val =
-                                            pci_map_single(host->pdev, buff[i],
+                                            pci_map_single(h->pdev, buff[i],
                                                     buff_size[i],
                                                     PCI_DMA_BIDIRECTIONAL);
                                         c->SG[i].Addr.lower =
@@ -1602,26 +1651,21 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                                 }
                         }
                         c->waiting = &wait;
-                        /* Put the request on the tail of the request queue */
-                        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-                        addQ(&host->reqQ, c);
-                        host->Qdepth++;
-                        start_io(host);
-                        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+                        enqueue_cmd_and_start_io(h, c);
                         wait_for_completion(&wait);
                         /* unlock the buffers from DMA */
                         for (i = 0; i < sg_used; i++) {
                                 temp64.val32.lower = c->SG[i].Addr.lower;
                                 temp64.val32.upper = c->SG[i].Addr.upper;
-                                pci_unmap_single(host->pdev,
+                                pci_unmap_single(h->pdev,
                                         (dma_addr_t) temp64.val, buff_size[i],
                                         PCI_DMA_BIDIRECTIONAL);
                         }
-                        check_ioctl_unit_attention(host, c);
+                        check_ioctl_unit_attention(h, c);
                         /* Copy the error information out */
                         ioc->error_info = *(c->err_info);
                         if (copy_to_user(argp, ioc, sizeof(*ioc))) {
-                                cmd_free(host, c, 0);
+                                cmd_special_free(h, c);
                                 status = -EFAULT;
                                 goto cleanup1;
                         }
@@ -1631,14 +1675,14 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
                                 for (i = 0; i < sg_used; i++) {
                                         if (copy_to_user
                                             (ptr, buff[i], buff_size[i])) {
-                                                cmd_free(host, c, 0);
+                                                cmd_special_free(h, c);
                                                 status = -EFAULT;
                                                 goto cleanup1;
                                         }
                                         ptr += buff_size[i];
                                 }
                         }
-                        cmd_free(host, c, 0);
+                        cmd_special_free(h, c);
                         status = 0;
                       cleanup1:
                         if (buff) {
@@ -1726,26 +1770,26 @@ static void cciss_check_queues(ctlr_info_t *h)
 
 static void cciss_softirq_done(struct request *rq)
 {
-        CommandList_struct *cmd = rq->completion_data;
-        ctlr_info_t *h = hba[cmd->ctlr];
-        SGDescriptor_struct *curr_sg = cmd->SG;
-        unsigned long flags;
+        CommandList_struct *c = rq->completion_data;
+        ctlr_info_t *h = hba[c->ctlr];
+        SGDescriptor_struct *curr_sg = c->SG;
         u64bit temp64;
+        unsigned long flags;
         int i, ddir;
         int sg_index = 0;
 
-        if (cmd->Request.Type.Direction == XFER_READ)
+        if (c->Request.Type.Direction == XFER_READ)
                 ddir = PCI_DMA_FROMDEVICE;
         else
                 ddir = PCI_DMA_TODEVICE;
 
         /* command did not need to be retried */
         /* unmap the DMA mapping for all the scatter gather elements */
-        for (i = 0; i < cmd->Header.SGList; i++) {
+        for (i = 0; i < c->Header.SGList; i++) {
                 if (curr_sg[sg_index].Ext == CCISS_SG_CHAIN) {
-                        cciss_unmap_sg_chain_block(h, cmd);
+                        cciss_unmap_sg_chain_block(h, c);
                         /* Point to the next block */
-                        curr_sg = h->cmd_sg_list[cmd->cmdindex];
+                        curr_sg = h->cmd_sg_list[c->cmdindex];
                         sg_index = 0;
                 }
                 temp64.val32.lower = curr_sg[sg_index].Addr.lower;
@@ -1755,18 +1799,16 @@ static void cciss_softirq_done(struct request *rq)
                 ++sg_index;
         }
 
-#ifdef CCISS_DEBUG
-        printk("Done with %p\n", rq);
-#endif                          /* CCISS_DEBUG */
+        dev_dbg(&h->pdev->dev, "Done with %p\n", rq);
 
         /* set the residual count for pc requests */
-        if (blk_pc_request(rq))
-                rq->resid_len = cmd->err_info->ResidualCnt;
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
+                rq->resid_len = c->err_info->ResidualCnt;
 
         blk_end_request_all(rq, (rq->errors == 0) ? 0 : -EIO);
 
         spin_lock_irqsave(&h->lock, flags);
-        cmd_free(h, cmd, 1);
+        cmd_free(h, c);
         cciss_check_queues(h);
         spin_unlock_irqrestore(&h->lock, flags);
 }
@@ -1782,7 +1824,7 @@ static inline void log_unit_to_scsi3addr(ctlr_info_t *h,
  * via the inquiry page 0.  Model, vendor, and rev are set to empty strings if
  * they cannot be read.
  */
-static void cciss_get_device_descr(int ctlr, int logvol,
+static void cciss_get_device_descr(ctlr_info_t *h, int logvol,
                                    char *vendor, char *model, char *rev)
 {
         int rc;
@@ -1797,8 +1839,8 @@ static void cciss_get_device_descr(int ctlr, int logvol,
         if (!inq_buf)
                 return;
 
-        log_unit_to_scsi3addr(hba[ctlr], scsi3addr, logvol);
-        rc = sendcmd_withirq(CISS_INQUIRY, ctlr, inq_buf, sizeof(*inq_buf), 0,
+        log_unit_to_scsi3addr(h, scsi3addr, logvol);
+        rc = sendcmd_withirq(h, CISS_INQUIRY, inq_buf, sizeof(*inq_buf), 0,
                         scsi3addr, TYPE_CMD);
         if (rc == IO_OK) {
                 memcpy(vendor, &inq_buf->data_byte[8], VENDOR_LEN);
@@ -1818,7 +1860,7 @@ static void cciss_get_device_descr(int ctlr, int logvol,
  * number cannot be had, for whatever reason, 16 bytes of 0xff
  * are returned instead.
  */
-static void cciss_get_serial_no(int ctlr, int logvol,
+static void cciss_get_serial_no(ctlr_info_t *h, int logvol,
                                 unsigned char *serial_no, int buflen)
 {
 #define PAGE_83_INQ_BYTES 64
@@ -1833,8 +1875,8 @@ static void cciss_get_serial_no(int ctlr, int logvol,
         if (!buf)
                 return;
         memset(serial_no, 0, buflen);
-        log_unit_to_scsi3addr(hba[ctlr], scsi3addr, logvol);
-        rc = sendcmd_withirq(CISS_INQUIRY, ctlr, buf,
+        log_unit_to_scsi3addr(h, scsi3addr, logvol);
+        rc = sendcmd_withirq(h, CISS_INQUIRY, buf,
                 PAGE_83_INQ_BYTES, 0x83, scsi3addr, TYPE_CMD);
         if (rc == IO_OK)
                 memcpy(serial_no, &buf[8], buflen);
@@ -1900,10 +1942,9 @@ init_queue_failure:
  * is also the controller node.  Any changes to disk 0 will show up on
  * the next reboot.
  */
-static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
-        int via_ioctl)
+static void cciss_update_drive_info(ctlr_info_t *h, int drv_index,
+        int first_time, int via_ioctl)
 {
-        ctlr_info_t *h = hba[ctlr];
         struct gendisk *disk;
         InquiryData_struct *inq_buff = NULL;
         unsigned int block_size;
@@ -1920,16 +1961,16 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
 
         /* testing to see if 16-byte CDBs are already being used */
         if (h->cciss_read == CCISS_READ_16) {
-                cciss_read_capacity_16(h->ctlr, drv_index,
+                cciss_read_capacity_16(h, drv_index,
                         &total_size, &block_size);
 
         } else {
-                cciss_read_capacity(ctlr, drv_index, &total_size, &block_size);
+                cciss_read_capacity(h, drv_index, &total_size, &block_size);
                 /* if read_capacity returns all F's this volume is >2TB */
                 /* in size so we switch to 16-byte CDB's for all */
                 /* read/write ops */
                 if (total_size == 0xFFFFFFFFULL) {
-                        cciss_read_capacity_16(ctlr, drv_index,
+                        cciss_read_capacity_16(h, drv_index,
                         &total_size, &block_size);
                         h->cciss_read = CCISS_READ_16;
                         h->cciss_write = CCISS_WRITE_16;
@@ -1939,14 +1980,14 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
                 }
         }
 
-        cciss_geometry_inquiry(ctlr, drv_index, total_size, block_size,
+        cciss_geometry_inquiry(h, drv_index, total_size, block_size,
                                inq_buff, drvinfo);
         drvinfo->block_size = block_size;
         drvinfo->nr_blocks = total_size + 1;
 
-        cciss_get_device_descr(ctlr, drv_index, drvinfo->vendor,
+        cciss_get_device_descr(h, drv_index, drvinfo->vendor,
                                 drvinfo->model, drvinfo->rev);
-        cciss_get_serial_no(ctlr, drv_index, drvinfo->serial_no,
+        cciss_get_serial_no(h, drv_index, drvinfo->serial_no,
                         sizeof(drvinfo->serial_no));
         /* Save the lunid in case we deregister the disk, below. */
         memcpy(drvinfo->LunID, h->drv[drv_index]->LunID,
@@ -1971,10 +2012,10 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
          * (unless it's the first disk (for the controller node).
          */
         if (h->drv[drv_index]->raid_level != -1 && drv_index != 0) {
-                printk(KERN_WARNING "disk %d has changed.\n", drv_index);
-                spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+                dev_warn(&h->pdev->dev, "disk %d has changed.\n", drv_index);
+                spin_lock_irqsave(&h->lock, flags);
                 h->drv[drv_index]->busy_configuring = 1;
-                spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
 
                 /* deregister_disk sets h->drv[drv_index]->queue = NULL
                  * which keeps the interrupt handler from starting
@@ -2024,8 +2065,8 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
                 if (cciss_add_disk(h, disk, drv_index) != 0) {
                         cciss_free_gendisk(h, drv_index);
                         cciss_free_drive_info(h, drv_index);
-                        printk(KERN_WARNING "cciss:%d could not update "
-                                "disk %d\n", h->ctlr, drv_index);
+                        dev_warn(&h->pdev->dev, "could not update disk %d\n",
+                                drv_index);
                         --h->num_luns;
                 }
         }
@@ -2035,7 +2076,7 @@ freeret:
         kfree(drvinfo);
         return;
 mem_msg:
-        printk(KERN_ERR "cciss: out of memory\n");
+        dev_err(&h->pdev->dev, "out of memory\n");
         goto freeret;
 }
 
@@ -2127,9 +2168,9 @@ static int cciss_add_gendisk(ctlr_info_t *h, unsigned char lunid[],
                 h->gendisk[drv_index] =
                         alloc_disk(1 << NWD_SHIFT);
                 if (!h->gendisk[drv_index]) {
-                        printk(KERN_ERR "cciss%d: could not "
-                                "allocate a new disk %d\n",
-                                h->ctlr, drv_index);
+                        dev_err(&h->pdev->dev,
+                                "could not allocate a new disk %d\n",
+                                drv_index);
                         goto err_free_drive_info;
                 }
         }
@@ -2180,8 +2221,7 @@ static void cciss_add_controller_node(ctlr_info_t *h)
         cciss_free_gendisk(h, drv_index);
         cciss_free_drive_info(h, drv_index);
 error:
-        printk(KERN_WARNING "cciss%d: could not "
-                "add disk 0.\n", h->ctlr);
+        dev_warn(&h->pdev->dev, "could not add disk 0.\n");
         return;
 }
 
@@ -2196,7 +2236,6 @@ error:
 static int rebuild_lun_table(ctlr_info_t *h, int first_time,
         int via_ioctl)
 {
-        int ctlr = h->ctlr;
         int num_luns;
         ReportLunData_struct *ld_buff = NULL;
         int return_code;
@@ -2211,27 +2250,27 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
                 return -EPERM;
 
         /* Set busy_configuring flag for this operation */
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         if (h->busy_configuring) {
-                spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 return -EBUSY;
         }
         h->busy_configuring = 1;
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        spin_unlock_irqrestore(&h->lock, flags);
 
         ld_buff = kzalloc(sizeof(ReportLunData_struct), GFP_KERNEL);
         if (ld_buff == NULL)
                 goto mem_msg;
 
-        return_code = sendcmd_withirq(CISS_REPORT_LOG, ctlr, ld_buff,
+        return_code = sendcmd_withirq(h, CISS_REPORT_LOG, ld_buff,
                                       sizeof(ReportLunData_struct),
                                       0, CTLR_LUNID, TYPE_CMD);
 
         if (return_code == IO_OK)
                 listlength = be32_to_cpu(*(__be32 *) ld_buff->LUNListLength);
         else {  /* reading number of logical volumes failed */
-                printk(KERN_WARNING "cciss: report logical volume"
-                       " command failed\n");
+                dev_warn(&h->pdev->dev,
+                        "report logical volume command failed\n");
                 listlength = 0;
                 goto freeret;
         }
@@ -2239,7 +2278,7 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
         num_luns = listlength / 8;      /* 8 bytes per entry */
         if (num_luns > CISS_MAX_LUN) {
                 num_luns = CISS_MAX_LUN;
-                printk(KERN_WARNING "cciss: more luns configured"
+                dev_warn(&h->pdev->dev, "more luns configured"
                        " on controller than can be handled by"
                        " this driver.\n");
         }
@@ -2270,9 +2309,9 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
                 }
                 if (!drv_found) {
                         /* Deregister it from the OS, it's gone. */
-                        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+                        spin_lock_irqsave(&h->lock, flags);
                         h->drv[i]->busy_configuring = 1;
-                        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+                        spin_unlock_irqrestore(&h->lock, flags);
                         return_code = deregister_disk(h, i, 1, via_ioctl);
                         if (h->drv[i] != NULL)
                                 h->drv[i]->busy_configuring = 0;
@@ -2311,8 +2350,7 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
                         if (drv_index == -1)
                                 goto freeret;
                 }
-                cciss_update_drive_info(ctlr, drv_index, first_time,
-                        via_ioctl);
+                cciss_update_drive_info(h, drv_index, first_time, via_ioctl);
         }               /* end for */
 
 freeret:
@@ -2324,7 +2362,7 @@ freeret:
          */
         return -1;
 mem_msg:
-        printk(KERN_ERR "cciss: out of memory\n");
+        dev_err(&h->pdev->dev, "out of memory\n");
         h->busy_configuring = 0;
         goto freeret;
 }
@@ -2444,11 +2482,10 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
         return 0;
 }
 
-static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
+static int fill_cmd(ctlr_info_t *h, CommandList_struct *c, __u8 cmd, void *buff,
                 size_t size, __u8 page_code, unsigned char *scsi3addr,
                 int cmd_type)
 {
-        ctlr_info_t *h = hba[ctlr];
         u64bit buff_dma_handle;
         int status = IO_OK;
 
@@ -2532,8 +2569,7 @@ static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
                         c->Request.Timeout = 0;
                         break;
                 default:
-                        printk(KERN_WARNING
-                               "cciss%d:  Unknown Command 0x%c\n", ctlr, cmd);
+                        dev_warn(&h->pdev->dev, "Unknown Command 0x%c\n", cmd);
                         return IO_ERROR;
                 }
         } else if (cmd_type == TYPE_MSG) {
@@ -2565,13 +2601,12 @@ static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
                         c->Request.CDB[0] = cmd;
                         break;
                 default:
-                        printk(KERN_WARNING
-                               "cciss%d: unknown message type %d\n", ctlr, cmd);
+                        dev_warn(&h->pdev->dev,
+                                "unknown message type %d\n", cmd);
                         return IO_ERROR;
                 }
         } else {
-                printk(KERN_WARNING
-                       "cciss%d: unknown command type %d\n", ctlr, cmd_type);
+                dev_warn(&h->pdev->dev, "unknown command type %d\n", cmd_type);
                 return IO_ERROR;
         }
         /* Fill in the scatter gather information */
@@ -2599,15 +2634,14 @@ static int check_target_status(ctlr_info_t *h, CommandList_struct *c)
                 default:
                         if (check_for_unit_attention(h, c))
                                 return IO_NEEDS_RETRY;
-                        printk(KERN_WARNING "cciss%d: cmd 0x%02x "
+                        dev_warn(&h->pdev->dev, "cmd 0x%02x "
                                 "check condition, sense key = 0x%02x\n",
-                                h->ctlr, c->Request.CDB[0],
-                                c->err_info->SenseInfo[2]);
+                                c->Request.CDB[0], c->err_info->SenseInfo[2]);
                 }
                 break;
         default:
-                printk(KERN_WARNING "cciss%d: cmd 0x%02x"
-                        "scsi status = 0x%02x\n", h->ctlr,
+                dev_warn(&h->pdev->dev, "cmd 0x%02x"
+                        "scsi status = 0x%02x\n",
                         c->Request.CDB[0], c->err_info->ScsiStatus);
                 break;
         }
@@ -2630,43 +2664,42 @@ static int process_sendcmd_error(ctlr_info_t *h, CommandList_struct *c)
                 /* expected for inquiry and report lun commands */
                 break;
         case CMD_INVALID:
-                printk(KERN_WARNING "cciss: cmd 0x%02x is "
+                dev_warn(&h->pdev->dev, "cmd 0x%02x is "
                        "reported invalid\n", c->Request.CDB[0]);
                 return_status = IO_ERROR;
                 break;
         case CMD_PROTOCOL_ERR:
-                printk(KERN_WARNING "cciss: cmd 0x%02x has "
-                       "protocol error \n", c->Request.CDB[0]);
+                dev_warn(&h->pdev->dev, "cmd 0x%02x has "
+                       "protocol error\n", c->Request.CDB[0]);
                 return_status = IO_ERROR;
                 break;
         case CMD_HARDWARE_ERR:
-                printk(KERN_WARNING "cciss: cmd 0x%02x had "
+                dev_warn(&h->pdev->dev, "cmd 0x%02x had "
                        " hardware error\n", c->Request.CDB[0]);
                 return_status = IO_ERROR;
                 break;
         case CMD_CONNECTION_LOST:
-                printk(KERN_WARNING "cciss: cmd 0x%02x had "
+                dev_warn(&h->pdev->dev, "cmd 0x%02x had "
                        "connection lost\n", c->Request.CDB[0]);
                 return_status = IO_ERROR;
                 break;
         case CMD_ABORTED:
-                printk(KERN_WARNING "cciss: cmd 0x%02x was "
+                dev_warn(&h->pdev->dev, "cmd 0x%02x was "
                        "aborted\n", c->Request.CDB[0]);
                 return_status = IO_ERROR;
                 break;
         case CMD_ABORT_FAILED:
-                printk(KERN_WARNING "cciss: cmd 0x%02x reports "
+                dev_warn(&h->pdev->dev, "cmd 0x%02x reports "
                        "abort failed\n", c->Request.CDB[0]);
                 return_status = IO_ERROR;
                 break;
         case CMD_UNSOLICITED_ABORT:
-                printk(KERN_WARNING
-                       "cciss%d: unsolicited abort 0x%02x\n", h->ctlr,
+                dev_warn(&h->pdev->dev, "unsolicited abort 0x%02x\n",
                         c->Request.CDB[0]);
                 return_status = IO_NEEDS_RETRY;
                 break;
         default:
-                printk(KERN_WARNING "cciss: cmd 0x%02x returned "
+                dev_warn(&h->pdev->dev, "cmd 0x%02x returned "
                        "unknown status %x\n", c->Request.CDB[0],
                        c->err_info->CommandStatus);
                 return_status = IO_ERROR;
@@ -2679,17 +2712,11 @@ static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c,
 {
         DECLARE_COMPLETION_ONSTACK(wait);
         u64bit buff_dma_handle;
-        unsigned long flags;
         int return_status = IO_OK;
 
 resend_cmd2:
         c->waiting = &wait;
-        /* Put the request on the tail of the queue and send it */
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
-        addQ(&h->reqQ, c);
-        h->Qdepth++;
-        start_io(h);
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+        enqueue_cmd_and_start_io(h, c);
 
         wait_for_completion(&wait);
 
@@ -2700,7 +2727,7 @@ resend_cmd2:
 
         if (return_status == IO_NEEDS_RETRY &&
                 c->retry_count < MAX_CMD_RETRIES) {
-                printk(KERN_WARNING "cciss%d: retrying 0x%02x\n", h->ctlr,
+                dev_warn(&h->pdev->dev, "retrying 0x%02x\n",
                         c->Request.CDB[0]);
                 c->retry_count++;
                 /* erase the old error information */
@@ -2719,27 +2746,26 @@ command_done:
         return return_status;
 }
 
-static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
+static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
                            __u8 page_code, unsigned char scsi3addr[],
                         int cmd_type)
 {
-        ctlr_info_t *h = hba[ctlr];
         CommandList_struct *c;
         int return_status;
 
-        c = cmd_alloc(h, 0);
+        c = cmd_special_alloc(h);
         if (!c)
                 return -ENOMEM;
-        return_status = fill_cmd(c, cmd, ctlr, buff, size, page_code,
+        return_status = fill_cmd(h, c, cmd, buff, size, page_code,
                 scsi3addr, cmd_type);
         if (return_status == IO_OK)
                 return_status = sendcmd_withirq_core(h, c, 1);
 
-        cmd_free(h, c, 0);
+        cmd_special_free(h, c);
         return return_status;
 }
 
-static void cciss_geometry_inquiry(int ctlr, int logvol,
+static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
                                    sector_t total_size,
                                    unsigned int block_size,
                                    InquiryData_struct *inq_buff,
@@ -2750,13 +2776,13 @@ static void cciss_geometry_inquiry(int ctlr, int logvol,
         unsigned char scsi3addr[8];
 
         memset(inq_buff, 0, sizeof(InquiryData_struct));
-        log_unit_to_scsi3addr(hba[ctlr], scsi3addr, logvol);
-        return_code = sendcmd_withirq(CISS_INQUIRY, ctlr, inq_buff,
+        log_unit_to_scsi3addr(h, scsi3addr, logvol);
+        return_code = sendcmd_withirq(h, CISS_INQUIRY, inq_buff,
                         sizeof(*inq_buff), 0xC1, scsi3addr, TYPE_CMD);
         if (return_code == IO_OK) {
                 if (inq_buff->data_byte[8] == 0xFF) {
-                        printk(KERN_WARNING
-                               "cciss: reading geometry failed, volume "
+                        dev_warn(&h->pdev->dev,
+                               "reading geometry failed, volume "
                                "does not support reading geometry\n");
                         drv->heads = 255;
                         drv->sectors = 32;      /* Sectors per track */
@@ -2780,12 +2806,12 @@ static void cciss_geometry_inquiry(int ctlr, int logvol,
                         drv->cylinders = real_size;
                 }
         } else {                /* Get geometry failed */
-                printk(KERN_WARNING "cciss: reading geometry failed\n");
+                dev_warn(&h->pdev->dev, "reading geometry failed\n");
         }
 }
 
 static void
-cciss_read_capacity(int ctlr, int logvol, sector_t *total_size,
+cciss_read_capacity(ctlr_info_t *h, int logvol, sector_t *total_size,
                     unsigned int *block_size)
 {
         ReadCapdata_struct *buf;
@@ -2794,25 +2820,25 @@ cciss_read_capacity(int ctlr, int logvol, sector_t *total_size,
 
         buf = kzalloc(sizeof(ReadCapdata_struct), GFP_KERNEL);
         if (!buf) {
-                printk(KERN_WARNING "cciss: out of memory\n");
+                dev_warn(&h->pdev->dev, "out of memory\n");
                 return;
         }
 
-        log_unit_to_scsi3addr(hba[ctlr], scsi3addr, logvol);
-        return_code = sendcmd_withirq(CCISS_READ_CAPACITY, ctlr, buf,
+        log_unit_to_scsi3addr(h, scsi3addr, logvol);
+        return_code = sendcmd_withirq(h, CCISS_READ_CAPACITY, buf,
                 sizeof(ReadCapdata_struct), 0, scsi3addr, TYPE_CMD);
         if (return_code == IO_OK) {
                 *total_size = be32_to_cpu(*(__be32 *) buf->total_size);
                 *block_size = be32_to_cpu(*(__be32 *) buf->block_size);
         } else {                /* read capacity command failed */
-                printk(KERN_WARNING "cciss: read capacity failed\n");
+                dev_warn(&h->pdev->dev, "read capacity failed\n");
                 *total_size = 0;
                 *block_size = BLOCK_SIZE;
         }
         kfree(buf);
 }
 
-static void cciss_read_capacity_16(int ctlr, int logvol,
+static void cciss_read_capacity_16(ctlr_info_t *h, int logvol,
         sector_t *total_size, unsigned int *block_size)
 {
         ReadCapdata_struct_16 *buf;
@@ -2821,23 +2847,23 @@ static void cciss_read_capacity_16(int ctlr, int logvol,
 
         buf = kzalloc(sizeof(ReadCapdata_struct_16), GFP_KERNEL);
         if (!buf) {
-                printk(KERN_WARNING "cciss: out of memory\n");
+                dev_warn(&h->pdev->dev, "out of memory\n");
                 return;
         }
 
-        log_unit_to_scsi3addr(hba[ctlr], scsi3addr, logvol);
-        return_code = sendcmd_withirq(CCISS_READ_CAPACITY_16,
-                ctlr, buf, sizeof(ReadCapdata_struct_16),
+        log_unit_to_scsi3addr(h, scsi3addr, logvol);
+        return_code = sendcmd_withirq(h, CCISS_READ_CAPACITY_16,
+                buf, sizeof(ReadCapdata_struct_16),
                         0, scsi3addr, TYPE_CMD);
         if (return_code == IO_OK) {
                 *total_size = be64_to_cpu(*(__be64 *) buf->total_size);
                 *block_size = be32_to_cpu(*(__be32 *) buf->block_size);
         } else {                /* read capacity command failed */
-                printk(KERN_WARNING "cciss: read capacity failed\n");
+                dev_warn(&h->pdev->dev, "read capacity failed\n");
                 *total_size = 0;
                 *block_size = BLOCK_SIZE;
         }
-        printk(KERN_INFO "      blocks= %llu block_size= %d\n",
+        dev_info(&h->pdev->dev, "      blocks= %llu block_size= %d\n",
                (unsigned long long)*total_size+1, *block_size);
         kfree(buf);
 }
@@ -2865,17 +2891,17 @@ static int cciss_revalidate(struct gendisk *disk)
 
         inq_buff = kmalloc(sizeof(InquiryData_struct), GFP_KERNEL);
         if (inq_buff == NULL) {
-                printk(KERN_WARNING "cciss: out of memory\n");
+                dev_warn(&h->pdev->dev, "out of memory\n");
                 return 1;
         }
         if (h->cciss_read == CCISS_READ_10) {
-                cciss_read_capacity(h->ctlr, logvol,
+                cciss_read_capacity(h, logvol,
                                         &total_size, &block_size);
         } else {
-                cciss_read_capacity_16(h->ctlr, logvol,
+                cciss_read_capacity_16(h, logvol,
                                         &total_size, &block_size);
         }
-        cciss_geometry_inquiry(h->ctlr, logvol, total_size, block_size,
+        cciss_geometry_inquiry(h, logvol, total_size, block_size,
                                inq_buff, drv);
 
         blk_queue_logical_block_size(drv->queue, drv->block_size);
@@ -2909,7 +2935,7 @@ static void start_io(ctlr_info_t *h)
                 c = hlist_entry(h->reqQ.first, CommandList_struct, list);
                 /* can't do anything if fifo is full */
                 if ((h->access.fifo_full(h))) {
-                        printk(KERN_WARNING "cciss: fifo full\n");
+                        dev_warn(&h->pdev->dev, "fifo full\n");
                         break;
                 }
 
@@ -2925,7 +2951,7 @@ static void start_io(ctlr_info_t *h)
         }
 }
 
-/* Assumes that CCISS_LOCK(h->ctlr) is held. */
+/* Assumes that h->lock is held. */
 /* Zeros out the error record and then resends the command back */
 /* to the controller */
 static inline void resend_cciss_cmd(ctlr_info_t *h, CommandList_struct *c)
@@ -2966,7 +2992,7 @@ static inline int evaluate_target_status(ctlr_info_t *h,
         driver_byte = DRIVER_OK;
         msg_byte = cmd->err_info->CommandStatus; /* correct?  seems too device specific */
 
-        if (blk_pc_request(cmd->rq))
+        if (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC)
                 host_byte = DID_PASSTHROUGH;
         else
                 host_byte = DID_OK;
@@ -2975,8 +3001,8 @@ static inline int evaluate_target_status(ctlr_info_t *h,
                 host_byte, driver_byte);
 
         if (cmd->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION) {
-                if (!blk_pc_request(cmd->rq))
-                        printk(KERN_WARNING "cciss: cmd %p "
+                if (cmd->rq->cmd_type != REQ_TYPE_BLOCK_PC)
+                        dev_warn(&h->pdev->dev, "cmd %p "
                                "has SCSI Status 0x%x\n",
                                cmd, cmd->err_info->ScsiStatus);
                 return error_value;
@@ -2985,17 +3011,19 @@ static inline int evaluate_target_status(ctlr_info_t *h,
         /* check the sense key */
         sense_key = 0xf & cmd->err_info->SenseInfo[2];
         /* no status or recovered error */
-        if (((sense_key == 0x0) || (sense_key == 0x1)) && !blk_pc_request(cmd->rq))
+        if (((sense_key == 0x0) || (sense_key == 0x1)) &&
+            (cmd->rq->cmd_type != REQ_TYPE_BLOCK_PC))
                 error_value = 0;
 
         if (check_for_unit_attention(h, cmd)) {
-                *retry_cmd = !blk_pc_request(cmd->rq);
+                *retry_cmd = !(cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC);
                 return 0;
         }
 
-        if (!blk_pc_request(cmd->rq)) { /* Not SG_IO or similar? */
+        /* Not SG_IO or similar? */
+        if (cmd->rq->cmd_type != REQ_TYPE_BLOCK_PC) {
                 if (error_value != 0)
-                        printk(KERN_WARNING "cciss: cmd %p has CHECK CONDITION"
+                        dev_warn(&h->pdev->dev, "cmd %p has CHECK CONDITION"
                                " sense key = 0x%x\n", cmd, sense_key);
                 return error_value;
         }
@@ -3035,90 +3063,97 @@ static inline void complete_command(ctlr_info_t *h, CommandList_struct *cmd,
                 rq->errors = evaluate_target_status(h, cmd, &retry_cmd);
                 break;
         case CMD_DATA_UNDERRUN:
-                if (blk_fs_request(cmd->rq)) {
-                        printk(KERN_WARNING "cciss: cmd %p has"
+                if (cmd->rq->cmd_type == REQ_TYPE_FS) {
+                        dev_warn(&h->pdev->dev, "cmd %p has"
                                " completed with data underrun "
                                "reported\n", cmd);
                         cmd->rq->resid_len = cmd->err_info->ResidualCnt;
                 }
                 break;
         case CMD_DATA_OVERRUN:
-                if (blk_fs_request(cmd->rq))
-                        printk(KERN_WARNING "cciss: cmd %p has"
+                if (cmd->rq->cmd_type == REQ_TYPE_FS)
+                        dev_warn(&h->pdev->dev, "cciss: cmd %p has"
                                " completed with data overrun "
                                "reported\n", cmd);
                 break;
         case CMD_INVALID:
-                printk(KERN_WARNING "cciss: cmd %p is "
+                dev_warn(&h->pdev->dev, "cciss: cmd %p is "
                        "reported invalid\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
                 break;
         case CMD_PROTOCOL_ERR:
-                printk(KERN_WARNING "cciss: cmd %p has "
-                       "protocol error \n", cmd);
+                dev_warn(&h->pdev->dev, "cciss: cmd %p has "
+                       "protocol error\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
                 break;
         case CMD_HARDWARE_ERR:
-                printk(KERN_WARNING "cciss: cmd %p had "
+                dev_warn(&h->pdev->dev, "cciss: cmd %p had "
                        " hardware error\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
                 break;
         case CMD_CONNECTION_LOST:
-                printk(KERN_WARNING "cciss: cmd %p had "
+                dev_warn(&h->pdev->dev, "cciss: cmd %p had "
                        "connection lost\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
                 break;
         case CMD_ABORTED:
-                printk(KERN_WARNING "cciss: cmd %p was "
+                dev_warn(&h->pdev->dev, "cciss: cmd %p was "
                        "aborted\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ABORT);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ABORT);
                 break;
         case CMD_ABORT_FAILED:
-                printk(KERN_WARNING "cciss: cmd %p reports "
+                dev_warn(&h->pdev->dev, "cciss: cmd %p reports "
                        "abort failed\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
                 break;
         case CMD_UNSOLICITED_ABORT:
-                printk(KERN_WARNING "cciss%d: unsolicited "
+                dev_warn(&h->pdev->dev, "cciss%d: unsolicited "
                        "abort %p\n", h->ctlr, cmd);
                 if (cmd->retry_count < MAX_CMD_RETRIES) {
                         retry_cmd = 1;
-                        printk(KERN_WARNING
-                               "cciss%d: retrying %p\n", h->ctlr, cmd);
+                        dev_warn(&h->pdev->dev, "retrying %p\n", cmd);
                         cmd->retry_count++;
                 } else
-                        printk(KERN_WARNING
-                               "cciss%d: %p retried too "
-                               "many times\n", h->ctlr, cmd);
+                        dev_warn(&h->pdev->dev,
+                                "%p retried too many times\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ABORT);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ABORT);
                 break;
         case CMD_TIMEOUT:
-                printk(KERN_WARNING "cciss: cmd %p timedout\n", cmd);
+                dev_warn(&h->pdev->dev, "cmd %p timedout\n", cmd);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
                 break;
         default:
-                printk(KERN_WARNING "cciss: cmd %p returned "
+                dev_warn(&h->pdev->dev, "cmd %p returned "
                        "unknown status %x\n", cmd,
                        cmd->err_info->CommandStatus);
                 rq->errors = make_status_bytes(SAM_STAT_GOOD,
                         cmd->err_info->CommandStatus, DRIVER_OK,
-                        blk_pc_request(cmd->rq) ? DID_PASSTHROUGH : DID_ERROR);
+                        (cmd->rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                DID_PASSTHROUGH : DID_ERROR);
         }
 
 after_error_processing:
@@ -3132,6 +3167,34 @@ after_error_processing:
         blk_complete_request(cmd->rq);
 }
 
+static inline u32 cciss_tag_contains_index(u32 tag)
+{
+#define DIRECT_LOOKUP_BIT 0x10
+        return tag & DIRECT_LOOKUP_BIT;
+}
+
+static inline u32 cciss_tag_to_index(u32 tag)
+{
+#define DIRECT_LOOKUP_SHIFT 5
+        return tag >> DIRECT_LOOKUP_SHIFT;
+}
+
+static inline u32 cciss_tag_discard_error_bits(u32 tag)
+{
+#define CCISS_ERROR_BITS 0x03
+        return tag & ~CCISS_ERROR_BITS;
+}
+
+static inline void cciss_mark_tag_indexed(u32 *tag)
+{
+        *tag |= DIRECT_LOOKUP_BIT;
+}
+
+static inline void cciss_set_tag_index(u32 *tag, u32 index)
+{
+        *tag |= (index << DIRECT_LOOKUP_SHIFT);
+}
+
 /*
  * Get a request and submit it to the controller.
  */
@@ -3163,7 +3226,8 @@ static void do_cciss_request(struct request_queue *q)
 
         BUG_ON(creq->nr_phys_segments > h->maxsgentries);
 
-        if ((c = cmd_alloc(h, 1)) == NULL)
+        c = cmd_alloc(h);
+        if (!c)
                 goto full;
 
         blk_start_request(creq);
@@ -3180,8 +3244,8 @@ static void do_cciss_request(struct request_queue *q)
         /* got command from pool, so use the command block index instead */
         /* for direct lookups. */
         /* The first 2 bits are reserved for controller error reporting. */
-        c->Header.Tag.lower = (c->cmdindex << 3);
-        c->Header.Tag.lower |= 0x04;    /* flag for direct lookup. */
+        cciss_set_tag_index(&c->Header.Tag.lower, c->cmdindex);
+        cciss_mark_tag_indexed(&c->Header.Tag.lower);
         memcpy(&c->Header.LUN, drv->LunID, sizeof(drv->LunID));
         c->Request.CDBLen = 10; /* 12 byte commands not in FW yet; */
         c->Request.Type.Type = TYPE_CMD;        /* It is a command. */
@@ -3192,11 +3256,8 @@ static void do_cciss_request(struct request_queue *q)
         c->Request.CDB[0] =
             (rq_data_dir(creq) == READ) ? h->cciss_read : h->cciss_write;
         start_blk = blk_rq_pos(creq);
-#ifdef CCISS_DEBUG
-        printk(KERN_DEBUG "ciss: sector =%d nr_sectors=%d\n",
+        dev_dbg(&h->pdev->dev, "sector =%d nr_sectors=%d\n",
                (int)blk_rq_pos(creq), (int)blk_rq_sectors(creq));
-#endif                          /* CCISS_DEBUG */
-
         sg_init_table(tmp_sg, h->maxsgentries);
         seg = blk_rq_map_sg(q, creq, tmp_sg);
 
@@ -3236,17 +3297,18 @@ static void do_cciss_request(struct request_queue *q)
         if (seg > h->maxSG)
                 h->maxSG = seg;
 
-#ifdef CCISS_DEBUG
-        printk(KERN_DEBUG "cciss: Submitting %ld sectors in %d segments "
+        dev_dbg(&h->pdev->dev, "Submitting %u sectors in %d segments "
                         "chained[%d]\n",
                         blk_rq_sectors(creq), seg, chained);
-#endif                          /* CCISS_DEBUG */
 
-        c->Header.SGList = c->Header.SGTotal = seg + chained;
-        if (seg > h->max_cmd_sgentries)
+        c->Header.SGTotal = seg + chained;
+        if (seg <= h->max_cmd_sgentries)
+                c->Header.SGList = c->Header.SGTotal;
+        else
                 c->Header.SGList = h->max_cmd_sgentries;
+        set_performant_mode(h, c);
 
-        if (likely(blk_fs_request(creq))) {
+        if (likely(creq->cmd_type == REQ_TYPE_FS)) {
                 if(h->cciss_read == CCISS_READ_10) {
                         c->Request.CDB[1] = 0;
                         c->Request.CDB[2] = (start_blk >> 24) & 0xff; /* MSB */
@@ -3276,11 +3338,12 @@ static void do_cciss_request(struct request_queue *q)
                         c->Request.CDB[13]= blk_rq_sectors(creq) & 0xff;
                         c->Request.CDB[14] = c->Request.CDB[15] = 0;
                 }
-        } else if (blk_pc_request(creq)) {
+        } else if (creq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 c->Request.CDBLen = creq->cmd_len;
                 memcpy(c->Request.CDB, creq->cmd, BLK_MAX_CDB);
         } else {
-                printk(KERN_WARNING "cciss%d: bad request type %d\n", h->ctlr, creq->cmd_type);
+                dev_warn(&h->pdev->dev, "bad request type %d\n",
+                        creq->cmd_type);
                 BUG();
         }
 
@@ -3313,72 +3376,131 @@ static inline int interrupt_pending(ctlr_info_t *h)
 
 static inline long interrupt_not_for_us(ctlr_info_t *h)
 {
-        return (((h->access.intr_pending(h) == 0) ||
-                 (h->interrupts_enabled == 0)));
+        return ((h->access.intr_pending(h) == 0) ||
+                (h->interrupts_enabled == 0));
 }
 
-static irqreturn_t do_cciss_intr(int irq, void *dev_id)
+static inline int bad_tag(ctlr_info_t *h, u32 tag_index,
+                        u32 raw_tag)
 {
-        ctlr_info_t *h = dev_id;
+        if (unlikely(tag_index >= h->nr_cmds)) {
+                dev_warn(&h->pdev->dev, "bad tag 0x%08x ignored.\n", raw_tag);
+                return 1;
+        }
+        return 0;
+}
+
+static inline void finish_cmd(ctlr_info_t *h, CommandList_struct *c,
+                                u32 raw_tag)
+{
+        removeQ(c);
+        if (likely(c->cmd_type == CMD_RWREQ))
+                complete_command(h, c, 0);
+        else if (c->cmd_type == CMD_IOCTL_PEND)
+                complete(c->waiting);
+#ifdef CONFIG_CISS_SCSI_TAPE
+        else if (c->cmd_type == CMD_SCSI)
+                complete_scsi_command(c, 0, raw_tag);
+#endif
+}
+
+static inline u32 next_command(ctlr_info_t *h)
+{
+        u32 a;
+
+        if (unlikely(h->transMethod != CFGTBL_Trans_Performant))
+                return h->access.command_completed(h);
+
+        if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
+                a = *(h->reply_pool_head); /* Next cmd in ring buffer */
+                (h->reply_pool_head)++;
+                h->commands_outstanding--;
+        } else {
+                a = FIFO_EMPTY;
+        }
+        /* Check for wraparound */
+        if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
+                h->reply_pool_head = h->reply_pool;
+                h->reply_pool_wraparound ^= 1;
+        }
+        return a;
+}
+
+/* process completion of an indexed ("direct lookup") command */
+static inline u32 process_indexed_cmd(ctlr_info_t *h, u32 raw_tag)
+{
+        u32 tag_index;
         CommandList_struct *c;
+
+        tag_index = cciss_tag_to_index(raw_tag);
+        if (bad_tag(h, tag_index, raw_tag))
+                return next_command(h);
+        c = h->cmd_pool + tag_index;
+        finish_cmd(h, c, raw_tag);
+        return next_command(h);
+}
+
+/* process completion of a non-indexed command */
+static inline u32 process_nonindexed_cmd(ctlr_info_t *h, u32 raw_tag)
+{
+        u32 tag;
+        CommandList_struct *c = NULL;
+        struct hlist_node *tmp;
+        __u32 busaddr_masked, tag_masked;
+
+        tag = cciss_tag_discard_error_bits(raw_tag);
+        hlist_for_each_entry(c, tmp, &h->cmpQ, list) {
+                busaddr_masked = cciss_tag_discard_error_bits(c->busaddr);
+                tag_masked = cciss_tag_discard_error_bits(tag);
+                if (busaddr_masked == tag_masked) {
+                        finish_cmd(h, c, raw_tag);
+                        return next_command(h);
+                }
+        }
+        bad_tag(h, h->nr_cmds + 1, raw_tag);
+        return next_command(h);
+}
+
+static irqreturn_t do_cciss_intx(int irq, void *dev_id)
+{
+        ctlr_info_t *h = dev_id;
         unsigned long flags;
-        __u32 a, a1, a2;
+        u32 raw_tag;
 
         if (interrupt_not_for_us(h))
                 return IRQ_NONE;
-        /*
-         * If there are completed commands in the completion queue,
-         * we had better do something about it.
-         */
-        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
         while (interrupt_pending(h)) {
-                while ((a = get_next_completion(h)) != FIFO_EMPTY) {
-                        a1 = a;
-                        if ((a & 0x04)) {
-                                a2 = (a >> 3);
-                                if (a2 >= h->nr_cmds) {
-                                        printk(KERN_WARNING
-                                               "cciss: controller cciss%d failed, stopping.\n",
-                                               h->ctlr);
-                                        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
-                                        fail_all_cmds(h->ctlr);
-                                        return IRQ_HANDLED;
-                                }
-
-                                c = h->cmd_pool + a2;
-                                a = c->busaddr;
-
-                        } else {
-                                struct hlist_node *tmp;
-
-                                a &= ~3;
-                                c = NULL;
-                                hlist_for_each_entry(c, tmp, &h->cmpQ, list) {
-                                        if (c->busaddr == a)
-                                                break;
-                                }
-                        }
-                        /*
-                         * If we've found the command, take it off the
-                         * completion Q and free it
-                         */
-                        if (c && c->busaddr == a) {
-                                removeQ(c);
-                                if (c->cmd_type == CMD_RWREQ) {
-                                        complete_command(h, c, 0);
-                                } else if (c->cmd_type == CMD_IOCTL_PEND) {
-                                        complete(c->waiting);
-                                }
-#                               ifdef CONFIG_CISS_SCSI_TAPE
-                                else if (c->cmd_type == CMD_SCSI)
-                                        complete_scsi_command(c, 0, a1);
-#                               endif
-                                continue;
-                        }
+                raw_tag = get_next_completion(h);
+                while (raw_tag != FIFO_EMPTY) {
+                        if (cciss_tag_contains_index(raw_tag))
+                                raw_tag = process_indexed_cmd(h, raw_tag);
+                        else
+                                raw_tag = process_nonindexed_cmd(h, raw_tag);
                 }
         }
+        spin_unlock_irqrestore(&h->lock, flags);
+        return IRQ_HANDLED;
+}
 
-        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+/* Add a second interrupt handler for MSI/MSI-X mode. In this mode we never
+ * check the interrupt pending register because it is not set.
+ */
+static irqreturn_t do_cciss_msix_intr(int irq, void *dev_id)
+{
+        ctlr_info_t *h = dev_id;
+        unsigned long flags;
+        u32 raw_tag;
+
+        spin_lock_irqsave(&h->lock, flags);
+        raw_tag = get_next_completion(h);
+        while (raw_tag != FIFO_EMPTY) {
+                if (cciss_tag_contains_index(raw_tag))
+                        raw_tag = process_indexed_cmd(h, raw_tag);
+                else
+                        raw_tag = process_nonindexed_cmd(h, raw_tag);
+        }
+        spin_unlock_irqrestore(&h->lock, flags);
         return IRQ_HANDLED;
 }
 
@@ -3510,18 +3632,17 @@ static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c)
 
         switch (c->err_info->SenseInfo[12]) {
         case STATE_CHANGED:
-                printk(KERN_WARNING "cciss%d: a state change "
-                        "detected, command retried\n", h->ctlr);
+                dev_warn(&h->pdev->dev, "a state change "
+                        "detected, command retried\n");
                 return 1;
         break;
         case LUN_FAILED:
-                printk(KERN_WARNING "cciss%d: LUN failure "
-                        "detected, action required\n", h->ctlr);
+                dev_warn(&h->pdev->dev, "LUN failure "
+                        "detected, action required\n");
                 return 1;
         break;
         case REPORT_LUNS_CHANGED:
-                printk(KERN_WARNING "cciss%d: report LUN data "
-                        "changed\n", h->ctlr);
+                dev_warn(&h->pdev->dev, "report LUN data changed\n");
         /*
          * Here, we could call add_to_scan_list and wake up the scan thread,
          * except that it's quite likely that we will get more than one
@@ -3541,19 +3662,18 @@ static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c)
                 return 1;
         break;
         case POWER_OR_RESET:
-                printk(KERN_WARNING "cciss%d: a power on "
-                        "or device reset detected\n", h->ctlr);
+                dev_warn(&h->pdev->dev,
+                        "a power on or device reset detected\n");
                 return 1;
         break;
         case UNIT_ATTENTION_CLEARED:
-                printk(KERN_WARNING "cciss%d: unit attention "
-                    "cleared by another initiator\n", h->ctlr);
+                dev_warn(&h->pdev->dev,
+                        "unit attention cleared by another initiator\n");
                 return 1;
         break;
         default:
-                printk(KERN_WARNING "cciss%d: unknown "
-                        "unit attention detected\n", h->ctlr);
-                                return 1;
+                dev_warn(&h->pdev->dev, "unknown unit attention detected\n");
+                return 1;
         }
 }
 
@@ -3562,39 +3682,41 @@ static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c)
  *   the io functions.
  *   This is for debug only.
  */
-#ifdef CCISS_DEBUG
-static void print_cfg_table(CfgTable_struct *tb)
+static void print_cfg_table(ctlr_info_t *h)
 {
         int i;
         char temp_name[17];
+        CfgTable_struct *tb = h->cfgtable;
 
-        printk("Controller Configuration information\n");
-        printk("------------------------------------\n");
+        dev_dbg(&h->pdev->dev, "Controller Configuration information\n");
+        dev_dbg(&h->pdev->dev, "------------------------------------\n");
         for (i = 0; i < 4; i++)
                 temp_name[i] = readb(&(tb->Signature[i]));
         temp_name[4] = '\0';
-        printk("   Signature = %s\n", temp_name);
-        printk("   Spec Number = %d\n", readl(&(tb->SpecValence)));
-        printk("   Transport methods supported = 0x%x\n",
+        dev_dbg(&h->pdev->dev, "   Signature = %s\n", temp_name);
+        dev_dbg(&h->pdev->dev, "   Spec Number = %d\n",
+                readl(&(tb->SpecValence)));
+        dev_dbg(&h->pdev->dev, "   Transport methods supported = 0x%x\n",
                readl(&(tb->TransportSupport)));
-        printk("   Transport methods active = 0x%x\n",
+        dev_dbg(&h->pdev->dev, "   Transport methods active = 0x%x\n",
                readl(&(tb->TransportActive)));
-        printk("   Requested transport Method = 0x%x\n",
+        dev_dbg(&h->pdev->dev, "   Requested transport Method = 0x%x\n",
                readl(&(tb->HostWrite.TransportRequest)));
-        printk("   Coalesce Interrupt Delay = 0x%x\n",
+        dev_dbg(&h->pdev->dev, "   Coalesce Interrupt Delay = 0x%x\n",
                readl(&(tb->HostWrite.CoalIntDelay)));
-        printk("   Coalesce Interrupt Count = 0x%x\n",
+        dev_dbg(&h->pdev->dev, "   Coalesce Interrupt Count = 0x%x\n",
                readl(&(tb->HostWrite.CoalIntCount)));
-        printk("   Max outstanding commands = 0x%d\n",
+        dev_dbg(&h->pdev->dev, "   Max outstanding commands = 0x%d\n",
                readl(&(tb->CmdsOutMax)));
-        printk("   Bus Types = 0x%x\n", readl(&(tb->BusTypes)));
+        dev_dbg(&h->pdev->dev, "   Bus Types = 0x%x\n",
+                readl(&(tb->BusTypes)));
         for (i = 0; i < 16; i++)
                 temp_name[i] = readb(&(tb->ServerName[i]));
         temp_name[16] = '\0';
-        printk("   Server Name = %s\n", temp_name);
-        printk("   Heartbeat Counter = 0x%x\n\n\n", readl(&(tb->HeartBeat)));
+        dev_dbg(&h->pdev->dev, "   Server Name = %s\n", temp_name);
+        dev_dbg(&h->pdev->dev, "   Heartbeat Counter = 0x%x\n\n\n",
+                readl(&(tb->HeartBeat)));
 }
-#endif                          /* CCISS_DEBUG */
 
 static int find_PCI_BAR_index(struct pci_dev *pdev, unsigned long pci_bar_addr)
 {
@@ -3618,7 +3740,7 @@ static int find_PCI_BAR_index(struct pci_dev *pdev, unsigned long pci_bar_addr)
                                 offset += 8;
                                 break;
                         default:        /* reserved in PCI 2.2 */
-                                printk(KERN_WARNING
+                                dev_warn(&pdev->dev,
                                        "Base address is invalid\n");
                                 return -1;
                                 break;
@@ -3630,12 +3752,182 @@ static int find_PCI_BAR_index(struct pci_dev *pdev, unsigned long pci_bar_addr)
         return -1;
 }
 
+/* Fill in bucket_map[], given nsgs (the max number of
+ * scatter gather elements supported) and bucket[],
+ * which is an array of 8 integers.  The bucket[] array
+ * contains 8 different DMA transfer sizes (in 16
+ * byte increments) which the controller uses to fetch
+ * commands.  This function fills in bucket_map[], which
+ * maps a given number of scatter gather elements to one of
+ * the 8 DMA transfer sizes.  The point of it is to allow the
+ * controller to only do as much DMA as needed to fetch the
+ * command, with the DMA transfer size encoded in the lower
+ * bits of the command address.
+ */
+static void  calc_bucket_map(int bucket[], int num_buckets,
+        int nsgs, int *bucket_map)
+{
+        int i, j, b, size;
+
+        /* even a command with 0 SGs requires 4 blocks */
+#define MINIMUM_TRANSFER_BLOCKS 4
+#define NUM_BUCKETS 8
+        /* Note, bucket_map must have nsgs+1 entries. */
+        for (i = 0; i <= nsgs; i++) {
+                /* Compute size of a command with i SG entries */
+                size = i + MINIMUM_TRANSFER_BLOCKS;
+                b = num_buckets; /* Assume the biggest bucket */
+                /* Find the bucket that is just big enough */
+                for (j = 0; j < 8; j++) {
+                        if (bucket[j] >= size) {
+                                b = j;
+                                break;
+                        }
+                }
+                /* for a command with i SG entries, use bucket b. */
+                bucket_map[i] = b;
+        }
+}
+
+static void __devinit cciss_wait_for_mode_change_ack(ctlr_info_t *h)
+{
+        int i;
+
+        /* under certain very rare conditions, this can take awhile.
+         * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
+         * as we enter this code.) */
+        for (i = 0; i < MAX_CONFIG_WAIT; i++) {
+                if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
+                        break;
+                msleep(10);
+        }
+}
+
+static __devinit void cciss_enter_performant_mode(ctlr_info_t *h)
+{
+        /* This is a bit complicated.  There are 8 registers on
+         * the controller which we write to to tell it 8 different
+         * sizes of commands which there may be.  It's a way of
+         * reducing the DMA done to fetch each command.  Encoded into
+         * each command's tag are 3 bits which communicate to the controller
+         * which of the eight sizes that command fits within.  The size of
+         * each command depends on how many scatter gather entries there are.
+         * Each SG entry requires 16 bytes.  The eight registers are programmed
+         * with the number of 16-byte blocks a command of that size requires.
+         * The smallest command possible requires 5 such 16 byte blocks.
+         * the largest command possible requires MAXSGENTRIES + 4 16-byte
+         * blocks.  Note, this only extends to the SG entries contained
+         * within the command block, and does not extend to chained blocks
+         * of SG elements.   bft[] contains the eight values we write to
+         * the registers.  They are not evenly distributed, but have more
+         * sizes for small commands, and fewer sizes for larger commands.
+         */
+        __u32 trans_offset;
+        int bft[8] = { 5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
+                        /*
+                         *  5 = 1 s/g entry or 4k
+                         *  6 = 2 s/g entry or 8k
+                         *  8 = 4 s/g entry or 16k
+                         * 10 = 6 s/g entry or 24k
+                         */
+        unsigned long register_value;
+        BUILD_BUG_ON(28 > MAXSGENTRIES + 4);
+
+        h->reply_pool_wraparound = 1; /* spec: init to 1 */
+
+        /* Controller spec: zero out this buffer. */
+        memset(h->reply_pool, 0, h->max_commands * sizeof(__u64));
+        h->reply_pool_head = h->reply_pool;
+
+        trans_offset = readl(&(h->cfgtable->TransMethodOffset));
+        calc_bucket_map(bft, ARRAY_SIZE(bft), h->maxsgentries,
+                                h->blockFetchTable);
+        writel(bft[0], &h->transtable->BlockFetch0);
+        writel(bft[1], &h->transtable->BlockFetch1);
+        writel(bft[2], &h->transtable->BlockFetch2);
+        writel(bft[3], &h->transtable->BlockFetch3);
+        writel(bft[4], &h->transtable->BlockFetch4);
+        writel(bft[5], &h->transtable->BlockFetch5);
+        writel(bft[6], &h->transtable->BlockFetch6);
+        writel(bft[7], &h->transtable->BlockFetch7);
+
+        /* size of controller ring buffer */
+        writel(h->max_commands, &h->transtable->RepQSize);
+        writel(1, &h->transtable->RepQCount);
+        writel(0, &h->transtable->RepQCtrAddrLow32);
+        writel(0, &h->transtable->RepQCtrAddrHigh32);
+        writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
+        writel(0, &h->transtable->RepQAddr0High32);
+        writel(CFGTBL_Trans_Performant,
+                        &(h->cfgtable->HostWrite.TransportRequest));
+
+        writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
+        cciss_wait_for_mode_change_ack(h);
+        register_value = readl(&(h->cfgtable->TransportActive));
+        if (!(register_value & CFGTBL_Trans_Performant))
+                dev_warn(&h->pdev->dev, "cciss: unable to get board into"
+                                        " performant mode\n");
+}
+
+static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
+{
+        __u32 trans_support;
+
+        dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n");
+        /* Attempt to put controller into performant mode if supported */
+        /* Does board support performant mode? */
+        trans_support = readl(&(h->cfgtable->TransportSupport));
+        if (!(trans_support & PERFORMANT_MODE))
+                return;
+
+        dev_dbg(&h->pdev->dev, "Placing controller into performant mode\n");
+        /* Performant mode demands commands on a 32 byte boundary
+         * pci_alloc_consistent aligns on page boundarys already.
+         * Just need to check if divisible by 32
+         */
+        if ((sizeof(CommandList_struct) % 32) != 0) {
+                dev_warn(&h->pdev->dev, "%s %d %s\n",
+                        "cciss info: command size[",
+                        (int)sizeof(CommandList_struct),
+                        "] not divisible by 32, no performant mode..\n");
+                return;
+        }
+
+        /* Performant mode ring buffer and supporting data structures */
+        h->reply_pool = (__u64 *)pci_alloc_consistent(
+                h->pdev, h->max_commands * sizeof(__u64),
+                &(h->reply_pool_dhandle));
+
+        /* Need a block fetch table for performant mode */
+        h->blockFetchTable = kmalloc(((h->maxsgentries+1) *
+                sizeof(__u32)), GFP_KERNEL);
+
+        if ((h->reply_pool == NULL) || (h->blockFetchTable == NULL))
+                goto clean_up;
+
+        cciss_enter_performant_mode(h);
+
+        /* Change the access methods to the performant access methods */
+        h->access = SA5_performant_access;
+        h->transMethod = CFGTBL_Trans_Performant;
+
+        return;
+clean_up:
+        kfree(h->blockFetchTable);
+        if (h->reply_pool)
+                pci_free_consistent(h->pdev,
+                                h->max_commands * sizeof(__u64),
+                                h->reply_pool,
+                                h->reply_pool_dhandle);
+        return;
+
+} /* cciss_put_controller_into_performant_mode */
+
 /* If MSI/MSI-X is supported by the kernel we will try to enable it on
  * controllers that are capable. If not, we use IO-APIC mode.
  */
 
-static void __devinit cciss_interrupt_mode(ctlr_info_t *c,
-                                           struct pci_dev *pdev, __u32 board_id)
+static void __devinit cciss_interrupt_mode(ctlr_info_t *h)
 {
 #ifdef CONFIG_PCI_MSI
         int err;
@@ -3644,268 +3936,283 @@ static void __devinit cciss_interrupt_mode(ctlr_info_t *c,
         };
 
         /* Some boards advertise MSI but don't really support it */
-        if ((board_id == 0x40700E11) ||
-            (board_id == 0x40800E11) ||
-            (board_id == 0x40820E11) || (board_id == 0x40830E11))
+        if ((h->board_id == 0x40700E11) || (h->board_id == 0x40800E11) ||
+            (h->board_id == 0x40820E11) || (h->board_id == 0x40830E11))
                 goto default_int_mode;
 
-        if (pci_find_capability(pdev, PCI_CAP_ID_MSIX)) {
-                err = pci_enable_msix(pdev, cciss_msix_entries, 4);
+        if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
+                err = pci_enable_msix(h->pdev, cciss_msix_entries, 4);
                 if (!err) {
-                        c->intr[0] = cciss_msix_entries[0].vector;
-                        c->intr[1] = cciss_msix_entries[1].vector;
-                        c->intr[2] = cciss_msix_entries[2].vector;
-                        c->intr[3] = cciss_msix_entries[3].vector;
-                        c->msix_vector = 1;
+                        h->intr[0] = cciss_msix_entries[0].vector;
+                        h->intr[1] = cciss_msix_entries[1].vector;
+                        h->intr[2] = cciss_msix_entries[2].vector;
+                        h->intr[3] = cciss_msix_entries[3].vector;
+                        h->msix_vector = 1;
                         return;
                 }
                 if (err > 0) {
-                        printk(KERN_WARNING "cciss: only %d MSI-X vectors "
-                               "available\n", err);
+                        dev_warn(&h->pdev->dev,
+                                "only %d MSI-X vectors available\n", err);
                         goto default_int_mode;
                 } else {
-                        printk(KERN_WARNING "cciss: MSI-X init failed %d\n",
-                               err);
+                        dev_warn(&h->pdev->dev,
+                                "MSI-X init failed %d\n", err);
                         goto default_int_mode;
                 }
         }
-        if (pci_find_capability(pdev, PCI_CAP_ID_MSI)) {
-                if (!pci_enable_msi(pdev)) {
-                        c->msi_vector = 1;
-                } else {
-                        printk(KERN_WARNING "cciss: MSI init failed\n");
-                }
+        if (pci_find_capability(h->pdev, PCI_CAP_ID_MSI)) {
+                if (!pci_enable_msi(h->pdev))
+                        h->msi_vector = 1;
+                else
+                        dev_warn(&h->pdev->dev, "MSI init failed\n");
         }
 default_int_mode:
 #endif                          /* CONFIG_PCI_MSI */
         /* if we get here we're going to use the default interrupt mode */
-        c->intr[SIMPLE_MODE_INT] = pdev->irq;
+        h->intr[PERF_MODE_INT] = h->pdev->irq;
         return;
 }
 
-static int __devinit cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
+static int __devinit cciss_lookup_board_id(struct pci_dev *pdev, u32 *board_id)
 {
-        ushort subsystem_vendor_id, subsystem_device_id, command;
-        __u32 board_id, scratchpad = 0;
-        __u64 cfg_offset;
-        __u32 cfg_base_addr;
-        __u64 cfg_base_addr_index;
-        int i, prod_index, err;
+        int i;
+        u32 subsystem_vendor_id, subsystem_device_id;
 
         subsystem_vendor_id = pdev->subsystem_vendor;
         subsystem_device_id = pdev->subsystem_device;
-        board_id = (((__u32) (subsystem_device_id << 16) & 0xffff0000) |
-                    subsystem_vendor_id);
+        *board_id = ((subsystem_device_id << 16) & 0xffff0000) |
+                        subsystem_vendor_id;
 
         for (i = 0; i < ARRAY_SIZE(products); i++) {
                 /* Stand aside for hpsa driver on request */
                 if (cciss_allow_hpsa && products[i].board_id == HPSA_BOUNDARY)
                         return -ENODEV;
-                if (board_id == products[i].board_id)
-                        break;
-        }
-        prod_index = i;
-        if (prod_index == ARRAY_SIZE(products)) {
-                dev_warn(&pdev->dev,
-                        "unrecognized board ID: 0x%08lx, ignoring.\n",
-                        (unsigned long) board_id);
-                return -ENODEV;
+                if (*board_id == products[i].board_id)
+                        return i;
         }
+        dev_warn(&pdev->dev, "unrecognized board ID: 0x%08x, ignoring.\n",
+                *board_id);
+        return -ENODEV;
+}
 
-        /* check to see if controller has been disabled */
-        /* BEFORE trying to enable it */
-        (void)pci_read_config_word(pdev, PCI_COMMAND, &command);
-        if (!(command & 0x02)) {
-                printk(KERN_WARNING
-                       "cciss: controller appears to be disabled\n");
-                return -ENODEV;
-        }
+static inline bool cciss_board_disabled(ctlr_info_t *h)
+{
+        u16 command;
 
-        err = pci_enable_device(pdev);
-        if (err) {
-                printk(KERN_ERR "cciss: Unable to Enable PCI device\n");
-                return err;
-        }
+        (void) pci_read_config_word(h->pdev, PCI_COMMAND, &command);
+        return ((command & PCI_COMMAND_MEMORY) == 0);
+}
 
-        err = pci_request_regions(pdev, "cciss");
-        if (err) {
-                printk(KERN_ERR "cciss: Cannot obtain PCI resources, "
-                       "aborting\n");
-                return err;
-        }
+static int __devinit cciss_pci_find_memory_BAR(struct pci_dev *pdev,
+        unsigned long *memory_bar)
+{
+        int i;
 
-#ifdef CCISS_DEBUG
-        printk("command = %x\n", command);
-        printk("irq = %x\n", pdev->irq);
-        printk("board_id = %x\n", board_id);
-#endif                          /* CCISS_DEBUG */
+        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
+                if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
+                        /* addressing mode bits already removed */
+                        *memory_bar = pci_resource_start(pdev, i);
+                        dev_dbg(&pdev->dev, "memory BAR = %lx\n",
+                                *memory_bar);
+                        return 0;
+                }
+        dev_warn(&pdev->dev, "no memory BAR found\n");
+        return -ENODEV;
+}
 
-/* If the kernel supports MSI/MSI-X we will try to enable that functionality,
- * else we use the IO-APIC interrupt assigned to us by system ROM.
- */
-        cciss_interrupt_mode(c, pdev, board_id);
+static int __devinit cciss_wait_for_board_ready(ctlr_info_t *h)
+{
+        int i;
+        u32 scratchpad;
 
-        /* find the memory BAR */
-        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-                if (pci_resource_flags(pdev, i) & IORESOURCE_MEM)
-                        break;
-        }
-        if (i == DEVICE_COUNT_RESOURCE) {
-                printk(KERN_WARNING "cciss: No memory BAR found\n");
-                err = -ENODEV;
-                goto err_out_free_res;
+        for (i = 0; i < CCISS_BOARD_READY_ITERATIONS; i++) {
+                scratchpad = readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
+                if (scratchpad == CCISS_FIRMWARE_READY)
+                        return 0;
+                msleep(CCISS_BOARD_READY_POLL_INTERVAL_MSECS);
         }
+        dev_warn(&h->pdev->dev, "board not ready, timed out.\n");
+        return -ENODEV;
+}
 
-        c->paddr = pci_resource_start(pdev, i); /* addressing mode bits
-                                                 * already removed
-                                                 */
+static int __devinit cciss_find_cfg_addrs(struct pci_dev *pdev,
+        void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
+        u64 *cfg_offset)
+{
+        *cfg_base_addr = readl(vaddr + SA5_CTCFG_OFFSET);
+        *cfg_offset = readl(vaddr + SA5_CTMEM_OFFSET);
+        *cfg_base_addr &= (u32) 0x0000ffff;
+        *cfg_base_addr_index = find_PCI_BAR_index(pdev, *cfg_base_addr);
+        if (*cfg_base_addr_index == -1) {
+                dev_warn(&pdev->dev, "cannot find cfg_base_addr_index, "
+                        "*cfg_base_addr = 0x%08x\n", *cfg_base_addr);
+                return -ENODEV;
+        }
+        return 0;
+}
 
-#ifdef CCISS_DEBUG
-        printk("address 0 = %lx\n", c->paddr);
-#endif                          /* CCISS_DEBUG */
-        c->vaddr = remap_pci_mem(c->paddr, 0x250);
+static int __devinit cciss_find_cfgtables(ctlr_info_t *h)
+{
+        u64 cfg_offset;
+        u32 cfg_base_addr;
+        u64 cfg_base_addr_index;
+        u32 trans_offset;
+        int rc;
 
-        /* Wait for the board to become ready.  (PCI hotplug needs this.)
-         * We poll for up to 120 secs, once per 100ms. */
-        for (i = 0; i < 1200; i++) {
-                scratchpad = readl(c->vaddr + SA5_SCRATCHPAD_OFFSET);
-                if (scratchpad == CCISS_FIRMWARE_READY)
-                        break;
-                set_current_state(TASK_INTERRUPTIBLE);
-                schedule_timeout(msecs_to_jiffies(100));        /* wait 100ms */
-        }
-        if (scratchpad != CCISS_FIRMWARE_READY) {
-                printk(KERN_WARNING "cciss: Board not ready.  Timed out.\n");
-                err = -ENODEV;
-                goto err_out_free_res;
-        }
+        rc = cciss_find_cfg_addrs(h->pdev, h->vaddr, &cfg_base_addr,
+                &cfg_base_addr_index, &cfg_offset);
+        if (rc)
+                return rc;
+        h->cfgtable = remap_pci_mem(pci_resource_start(h->pdev,
+                cfg_base_addr_index) + cfg_offset, sizeof(h->cfgtable));
+        if (!h->cfgtable)
+                return -ENOMEM;
+        /* Find performant mode table. */
+        trans_offset = readl(&h->cfgtable->TransMethodOffset);
+        h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
+                                cfg_base_addr_index)+cfg_offset+trans_offset,
+                                sizeof(*h->transtable));
+        if (!h->transtable)
+                return -ENOMEM;
+        return 0;
+}
 
-        /* get the address index number */
-        cfg_base_addr = readl(c->vaddr + SA5_CTCFG_OFFSET);
-        cfg_base_addr &= (__u32) 0x0000ffff;
-#ifdef CCISS_DEBUG
-        printk("cfg base address = %x\n", cfg_base_addr);
-#endif                          /* CCISS_DEBUG */
-        cfg_base_addr_index = find_PCI_BAR_index(pdev, cfg_base_addr);
-#ifdef CCISS_DEBUG
-        printk("cfg base address index = %llx\n",
-                (unsigned long long)cfg_base_addr_index);
-#endif                          /* CCISS_DEBUG */
-        if (cfg_base_addr_index == -1) {
-                printk(KERN_WARNING "cciss: Cannot find cfg_base_addr_index\n");
-                err = -ENODEV;
-                goto err_out_free_res;
+static void __devinit cciss_get_max_perf_mode_cmds(struct ctlr_info *h)
+{
+        h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
+        if (h->max_commands < 16) {
+                dev_warn(&h->pdev->dev, "Controller reports "
+                        "max supported commands of %d, an obvious lie. "
+                        "Using 16.  Ensure that firmware is up to date.\n",
+                        h->max_commands);
+                h->max_commands = 16;
         }
+}
 
-        cfg_offset = readl(c->vaddr + SA5_CTMEM_OFFSET);
-#ifdef CCISS_DEBUG
-        printk("cfg offset = %llx\n", (unsigned long long)cfg_offset);
-#endif                          /* CCISS_DEBUG */
-        c->cfgtable = remap_pci_mem(pci_resource_start(pdev,
-                                                       cfg_base_addr_index) +
-                                    cfg_offset, sizeof(CfgTable_struct));
-        c->board_id = board_id;
-
-#ifdef CCISS_DEBUG
-        print_cfg_table(c->cfgtable);
-#endif                          /* CCISS_DEBUG */
-
-        /* Some controllers support Zero Memory Raid (ZMR).
-         * When configured in ZMR mode the number of supported
-         * commands drops to 64. So instead of just setting an
-         * arbitrary value we make the driver a little smarter.
-         * We read the config table to tell us how many commands
-         * are supported on the controller then subtract 4 to
-         * leave a little room for ioctl calls.
-         */
-        c->max_commands = readl(&(c->cfgtable->CmdsOutMax));
-        c->maxsgentries = readl(&(c->cfgtable->MaxSGElements));
-
+/* Interrogate the hardware for some limits:
+ * max commands, max SG elements without chaining, and with chaining,
+ * SG chain block size, etc.
+ */
+static void __devinit cciss_find_board_params(ctlr_info_t *h)
+{
+        cciss_get_max_perf_mode_cmds(h);
+        h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
+        h->maxsgentries = readl(&(h->cfgtable->MaxSGElements));
         /*
-         * Limit native command to 32 s/g elements to save dma'able memory.
+         * Limit in-command s/g elements to 32 save dma'able memory.
          * Howvever spec says if 0, use 31
          */
-
-        c->max_cmd_sgentries = 31;
-        if (c->maxsgentries > 512) {
-                c->max_cmd_sgentries = 32;
-                c->chainsize = c->maxsgentries - c->max_cmd_sgentries + 1;
-                c->maxsgentries -= 1;   /* account for chain pointer */
+        h->max_cmd_sgentries = 31;
+        if (h->maxsgentries > 512) {
+                h->max_cmd_sgentries = 32;
+                h->chainsize = h->maxsgentries - h->max_cmd_sgentries + 1;
+                h->maxsgentries--; /* save one for chain pointer */
         } else {
-                c->maxsgentries = 31;   /* Default to traditional value */
-                c->chainsize = 0;       /* traditional */
+                h->maxsgentries = 31; /* default to traditional values */
+                h->chainsize = 0;
         }
+}
 
-        c->product_name = products[prod_index].product_name;
-        c->access = *(products[prod_index].access);
-        c->nr_cmds = c->max_commands - 4;
-        if ((readb(&c->cfgtable->Signature[0]) != 'C') ||
-            (readb(&c->cfgtable->Signature[1]) != 'I') ||
-            (readb(&c->cfgtable->Signature[2]) != 'S') ||
-            (readb(&c->cfgtable->Signature[3]) != 'S')) {
-                printk("Does not appear to be a valid CISS config table\n");
-                err = -ENODEV;
-                goto err_out_free_res;
+static inline bool CISS_signature_present(ctlr_info_t *h)
+{
+        if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
+            (readb(&h->cfgtable->Signature[1]) != 'I') ||
+            (readb(&h->cfgtable->Signature[2]) != 'S') ||
+            (readb(&h->cfgtable->Signature[3]) != 'S')) {
+                dev_warn(&h->pdev->dev, "not a valid CISS config table\n");
+                return false;
         }
+        return true;
+}
+
+/* Need to enable prefetch in the SCSI core for 6400 in x86 */
+static inline void cciss_enable_scsi_prefetch(ctlr_info_t *h)
+{
 #ifdef CONFIG_X86
-        {
-                /* Need to enable prefetch in the SCSI core for 6400 in x86 */
-                __u32 prefetch;
-                prefetch = readl(&(c->cfgtable->SCSI_Prefetch));
-                prefetch |= 0x100;
-                writel(prefetch, &(c->cfgtable->SCSI_Prefetch));
-        }
+        u32 prefetch;
+
+        prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
+        prefetch |= 0x100;
+        writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
 #endif
+}
 
-        /* Disabling DMA prefetch and refetch for the P600.
-         * An ASIC bug may result in accesses to invalid memory addresses.
-         * We've disabled prefetch for some time now. Testing with XEN
-         * kernels revealed a bug in the refetch if dom0 resides on a P600.
-         */
-        if(board_id == 0x3225103C) {
-                __u32 dma_prefetch;
-                __u32 dma_refetch;
-                dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
-                dma_prefetch |= 0x8000;
-                writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
-                pci_read_config_dword(pdev, PCI_COMMAND_PARITY, &dma_refetch);
-                dma_refetch |= 0x1;
-                pci_write_config_dword(pdev, PCI_COMMAND_PARITY, dma_refetch);
+/* Disable DMA prefetch for the P600.  Otherwise an ASIC bug may result
+ * in a prefetch beyond physical memory.
+ */
+static inline void cciss_p600_dma_prefetch_quirk(ctlr_info_t *h)
+{
+        u32 dma_prefetch;
+        __u32 dma_refetch;
+
+        if (h->board_id != 0x3225103C)
+                return;
+        dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
+        dma_prefetch |= 0x8000;
+        writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
+        pci_read_config_dword(h->pdev, PCI_COMMAND_PARITY, &dma_refetch);
+        dma_refetch |= 0x1;
+        pci_write_config_dword(h->pdev, PCI_COMMAND_PARITY, dma_refetch);
+}
+
+static int __devinit cciss_pci_init(ctlr_info_t *h)
+{
+        int prod_index, err;
+
+        prod_index = cciss_lookup_board_id(h->pdev, &h->board_id);
+        if (prod_index < 0)
+                return -ENODEV;
+        h->product_name = products[prod_index].product_name;
+        h->access = *(products[prod_index].access);
+
+        if (cciss_board_disabled(h)) {
+                dev_warn(&h->pdev->dev, "controller appears to be disabled\n");
+                return -ENODEV;
+        }
+        err = pci_enable_device(h->pdev);
+        if (err) {
+                dev_warn(&h->pdev->dev, "Unable to Enable PCI device\n");
+                return err;
         }
 
-#ifdef CCISS_DEBUG
-        printk("Trying to put board into Simple mode\n");
-#endif                          /* CCISS_DEBUG */
-        c->max_commands = readl(&(c->cfgtable->CmdsOutMax));
-        /* Update the field, and then ring the doorbell */
-        writel(CFGTBL_Trans_Simple, &(c->cfgtable->HostWrite.TransportRequest));
-        writel(CFGTBL_ChangeReq, c->vaddr + SA5_DOORBELL);
+        err = pci_request_regions(h->pdev, "cciss");
+        if (err) {
+                dev_warn(&h->pdev->dev,
+                        "Cannot obtain PCI resources, aborting\n");
+                return err;
+        }
 
-        /* under certain very rare conditions, this can take awhile.
-         * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
-         * as we enter this code.) */
-        for (i = 0; i < MAX_CONFIG_WAIT; i++) {
-                if (!(readl(c->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
-                        break;
-                /* delay and try again */
-                set_current_state(TASK_INTERRUPTIBLE);
-                schedule_timeout(msecs_to_jiffies(1));
+        dev_dbg(&h->pdev->dev, "irq = %x\n", h->pdev->irq);
+        dev_dbg(&h->pdev->dev, "board_id = %x\n", h->board_id);
+
+/* If the kernel supports MSI/MSI-X we will try to enable that functionality,
+ * else we use the IO-APIC interrupt assigned to us by system ROM.
+ */
+        cciss_interrupt_mode(h);
+        err = cciss_pci_find_memory_BAR(h->pdev, &h->paddr);
+        if (err)
+                goto err_out_free_res;
+        h->vaddr = remap_pci_mem(h->paddr, 0x250);
+        if (!h->vaddr) {
+                err = -ENOMEM;
+                goto err_out_free_res;
         }
+        err = cciss_wait_for_board_ready(h);
+        if (err)
+                goto err_out_free_res;
+        err = cciss_find_cfgtables(h);
+        if (err)
+                goto err_out_free_res;
+        print_cfg_table(h);
+        cciss_find_board_params(h);
 
-#ifdef CCISS_DEBUG
-        printk(KERN_DEBUG "I counter got to %d %x\n", i,
-               readl(c->vaddr + SA5_DOORBELL));
-#endif                          /* CCISS_DEBUG */
-#ifdef CCISS_DEBUG
-        print_cfg_table(c->cfgtable);
-#endif                          /* CCISS_DEBUG */
-
-        if (!(readl(&(c->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
-                printk(KERN_WARNING "cciss: unable to get board into"
-                       " simple mode\n");
+        if (!CISS_signature_present(h)) {
                 err = -ENODEV;
                 goto err_out_free_res;
         }
+        cciss_enable_scsi_prefetch(h);
+        cciss_p600_dma_prefetch_quirk(h);
+        cciss_put_controller_into_performant_mode(h);
         return 0;
 
 err_out_free_res:
@@ -3913,42 +4220,47 @@ err_out_free_res:
          * Deliberately omit pci_disable_device(): it does something nasty to
          * Smart Array controllers that pci_enable_device does not undo
          */
-        pci_release_regions(pdev);
+        if (h->transtable)
+                iounmap(h->transtable);
+        if (h->cfgtable)
+                iounmap(h->cfgtable);
+        if (h->vaddr)
+                iounmap(h->vaddr);
+        pci_release_regions(h->pdev);
         return err;
 }
 
 /* Function to find the first free pointer into our hba[] array
  * Returns -1 if no free entries are left.
  */
-static int alloc_cciss_hba(void)
+static int alloc_cciss_hba(struct pci_dev *pdev)
 {
         int i;
 
         for (i = 0; i < MAX_CTLR; i++) {
                 if (!hba[i]) {
-                        ctlr_info_t *p;
+                        ctlr_info_t *h;
 
-                        p = kzalloc(sizeof(ctlr_info_t), GFP_KERNEL);
-                        if (!p)
+                        h = kzalloc(sizeof(ctlr_info_t), GFP_KERNEL);
+                        if (!h)
                                 goto Enomem;
-                        hba[i] = p;
+                        hba[i] = h;
                         return i;
                 }
         }
-        printk(KERN_WARNING "cciss: This driver supports a maximum"
+        dev_warn(&pdev->dev, "This driver supports a maximum"
                " of %d controllers.\n", MAX_CTLR);
         return -1;
 Enomem:
-        printk(KERN_ERR "cciss: out of memory.\n");
+        dev_warn(&pdev->dev, "out of memory.\n");
         return -1;
 }
 
-static void free_hba(int n)
+static void free_hba(ctlr_info_t *h)
 {
-        ctlr_info_t *h = hba[n];
         int i;
 
-        hba[n] = NULL;
+        hba[h->ctlr] = NULL;
         for (i = 0; i < h->highest_lun + 1; i++)
                 if (h->gendisk[i] != NULL)
                         put_disk(h->gendisk[i]);
@@ -4028,7 +4340,8 @@ static __devinit int cciss_message(struct pci_dev *pdev, unsigned char opcode, u
         /* we leak the DMA buffer here ... no choice since the controller could
            still complete the command. */
         if (i == 10) {
-                printk(KERN_ERR "cciss: controller message %02x:%02x timed out\n",
+                dev_err(&pdev->dev,
+                        "controller message %02x:%02x timed out\n",
                         opcode, type);
                 return -ETIMEDOUT;
         }
@@ -4036,12 +4349,12 @@ static __devinit int cciss_message(struct pci_dev *pdev, unsigned char opcode, u
         pci_free_consistent(pdev, cmd_sz, cmd, paddr64);
 
         if (tag & 2) {
-                printk(KERN_ERR "cciss: controller message %02x:%02x failed\n",
+                dev_err(&pdev->dev, "controller message %02x:%02x failed\n",
                         opcode, type);
                 return -EIO;
         }
 
-        printk(KERN_INFO "cciss: controller message %02x:%02x succeeded\n",
+        dev_info(&pdev->dev, "controller message %02x:%02x succeeded\n",
                 opcode, type);
         return 0;
 }
@@ -4062,7 +4375,7 @@ static __devinit int cciss_reset_msi(struct pci_dev *pdev)
         if (pos) {
                 pci_read_config_word(pdev, msi_control_reg(pos), &control);
                 if (control & PCI_MSI_FLAGS_ENABLE) {
-                        printk(KERN_INFO "cciss: resetting MSI\n");
+                        dev_info(&pdev->dev, "resetting MSI\n");
                         pci_write_config_word(pdev, msi_control_reg(pos), control & ~PCI_MSI_FLAGS_ENABLE);
                 }
         }
@@ -4071,7 +4384,7 @@ static __devinit int cciss_reset_msi(struct pci_dev *pdev)
         if (pos) {
                 pci_read_config_word(pdev, msi_control_reg(pos), &control);
                 if (control & PCI_MSIX_FLAGS_ENABLE) {
-                        printk(KERN_INFO "cciss: resetting MSI-X\n");
+                        dev_info(&pdev->dev, "resetting MSI-X\n");
                         pci_write_config_word(pdev, msi_control_reg(pos), control & ~PCI_MSIX_FLAGS_ENABLE);
                 }
         }
@@ -4079,68 +4392,144 @@ static __devinit int cciss_reset_msi(struct pci_dev *pdev)
         return 0;
 }
 
-/* This does a hard reset of the controller using PCI power management
- * states. */
-static __devinit int cciss_hard_reset_controller(struct pci_dev *pdev)
+static int cciss_controller_hard_reset(struct pci_dev *pdev,
+        void * __iomem vaddr, bool use_doorbell)
 {
-        u16 pmcsr, saved_config_space[32];
-        int i, pos;
+        u16 pmcsr;
+        int pos;
 
-        printk(KERN_INFO "cciss: using PCI PM to reset controller\n");
+        if (use_doorbell) {
+                /* For everything after the P600, the PCI power state method
+                 * of resetting the controller doesn't work, so we have this
+                 * other way using the doorbell register.
+                 */
+                dev_info(&pdev->dev, "using doorbell to reset controller\n");
+                writel(DOORBELL_CTLR_RESET, vaddr + SA5_DOORBELL);
+                msleep(1000);
+        } else { /* Try to do it the PCI power state way */
+
+                /* Quoting from the Open CISS Specification: "The Power
+                 * Management Control/Status Register (CSR) controls the power
+                 * state of the device.  The normal operating state is D0,
+                 * CSR=00h.  The software off state is D3, CSR=03h.  To reset
+                 * the controller, place the interface device in D3 then to D0,
+                 * this causes a secondary PCI reset which will reset the
+                 * controller." */
+
+                pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
+                if (pos == 0) {
+                        dev_err(&pdev->dev,
+                                "cciss_controller_hard_reset: "
+                                "PCI PM not supported\n");
+                        return -ENODEV;
+                }
+                dev_info(&pdev->dev, "using PCI PM to reset controller\n");
+                /* enter the D3hot power management state */
+                pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
+                pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
+                pmcsr |= PCI_D3hot;
+                pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
 
-        /* This is very nearly the same thing as
+                msleep(500);
 
-           pci_save_state(pci_dev);
-           pci_set_power_state(pci_dev, PCI_D3hot);
-           pci_set_power_state(pci_dev, PCI_D0);
-           pci_restore_state(pci_dev);
+                /* enter the D0 power management state */
+                pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
+                pmcsr |= PCI_D0;
+                pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
 
-           but we can't use these nice canned kernel routines on
-           kexec, because they also check the MSI/MSI-X state in PCI
-           configuration space and do the wrong thing when it is
-           set/cleared.  Also, the pci_save/restore_state functions
-           violate the ordering requirements for restoring the
-           configuration space from the CCISS document (see the
-           comment below).  So we roll our own .... */
+                msleep(500);
+        }
+        return 0;
+}
 
-        for (i = 0; i < 32; i++)
-                pci_read_config_word(pdev, 2*i, &saved_config_space[i]);
+/* This does a hard reset of the controller using PCI power management
+ * states or using the doorbell register. */
+static __devinit int cciss_kdump_hard_reset_controller(struct pci_dev *pdev)
+{
+        u16 saved_config_space[32];
+        u64 cfg_offset;
+        u32 cfg_base_addr;
+        u64 cfg_base_addr_index;
+        void __iomem *vaddr;
+        unsigned long paddr;
+        u32 misc_fw_support, active_transport;
+        int rc, i;
+        CfgTable_struct __iomem *cfgtable;
+        bool use_doorbell;
+        u32 board_id;
+
+        /* For controllers as old a the p600, this is very nearly
+         * the same thing as
+         *
+         * pci_save_state(pci_dev);
+         * pci_set_power_state(pci_dev, PCI_D3hot);
+         * pci_set_power_state(pci_dev, PCI_D0);
+         * pci_restore_state(pci_dev);
+         *
+         * but we can't use these nice canned kernel routines on
+         * kexec, because they also check the MSI/MSI-X state in PCI
+         * configuration space and do the wrong thing when it is
+         * set/cleared.  Also, the pci_save/restore_state functions
+         * violate the ordering requirements for restoring the
+         * configuration space from the CCISS document (see the
+         * comment below).  So we roll our own ....
+         *
+         * For controllers newer than the P600, the pci power state
+         * method of resetting doesn't work so we have another way
+         * using the doorbell register.
+         */
 
-        pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
-        if (pos == 0) {
-                printk(KERN_ERR "cciss_reset_controller: PCI PM not supported\n");
+        /* Exclude 640x boards.  These are two pci devices in one slot
+         * which share a battery backed cache module.  One controls the
+         * cache, the other accesses the cache through the one that controls
+         * it.  If we reset the one controlling the cache, the other will
+         * likely not be happy.  Just forbid resetting this conjoined mess.
+         */
+        cciss_lookup_board_id(pdev, &board_id);
+        if (board_id == 0x409C0E11 || board_id == 0x409D0E11) {
+                dev_warn(&pdev->dev, "Cannot reset Smart Array 640x "
+                                "due to shared cache module.");
                 return -ENODEV;
         }
 
-        /* Quoting from the Open CISS Specification: "The Power
-         * Management Control/Status Register (CSR) controls the power
-         * state of the device.  The normal operating state is D0,
-         * CSR=00h.  The software off state is D3, CSR=03h.  To reset
-         * the controller, place the interface device in D3 then to
-         * D0, this causes a secondary PCI reset which will reset the
-         * controller." */
+        for (i = 0; i < 32; i++)
+                pci_read_config_word(pdev, 2*i, &saved_config_space[i]);
 
-        /* enter the D3hot power management state */
-        pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
-        pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
-        pmcsr |= PCI_D3hot;
-        pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
+        /* find the first memory BAR, so we can find the cfg table */
+        rc = cciss_pci_find_memory_BAR(pdev, &paddr);
+        if (rc)
+                return rc;
+        vaddr = remap_pci_mem(paddr, 0x250);
+        if (!vaddr)
+                return -ENOMEM;
 
-        schedule_timeout_uninterruptible(HZ >> 1);
+        /* find cfgtable in order to check if reset via doorbell is supported */
+        rc = cciss_find_cfg_addrs(pdev, vaddr, &cfg_base_addr,
+                                        &cfg_base_addr_index, &cfg_offset);
+        if (rc)
+                goto unmap_vaddr;
+        cfgtable = remap_pci_mem(pci_resource_start(pdev,
+                       cfg_base_addr_index) + cfg_offset, sizeof(*cfgtable));
+        if (!cfgtable) {
+                rc = -ENOMEM;
+                goto unmap_vaddr;
+        }
 
-        /* enter the D0 power management state */
-        pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
-        pmcsr |= PCI_D0;
-        pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
+        /* If reset via doorbell register is supported, use that. */
+        misc_fw_support = readl(&cfgtable->misc_fw_support);
+        use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
 
-        schedule_timeout_uninterruptible(HZ >> 1);
+        rc = cciss_controller_hard_reset(pdev, vaddr, use_doorbell);
+        if (rc)
+                goto unmap_cfgtable;
 
         /* Restore the PCI configuration space.  The Open CISS
          * Specification says, "Restore the PCI Configuration
          * Registers, offsets 00h through 60h. It is important to
          * restore the command register, 16-bits at offset 04h,
          * last. Do not restore the configuration status register,
-         * 16-bits at offset 06h."  Note that the offset is 2*i. */
+         * 16-bits at offset 06h."  Note that the offset is 2*i.
+         */
         for (i = 0; i < 32; i++) {
                 if (i == 2 || i == 3)
                         continue;
@@ -4149,6 +4538,63 @@ static __devinit int cciss_hard_reset_controller(struct pci_dev *pdev)
         wmb();
         pci_write_config_word(pdev, 4, saved_config_space[2]);
 
+        /* Some devices (notably the HP Smart Array 5i Controller)
+           need a little pause here */
+        msleep(CCISS_POST_RESET_PAUSE_MSECS);
+
+        /* Controller should be in simple mode at this point.  If it's not,
+         * It means we're on one of those controllers which doesn't support
+         * the doorbell reset method and on which the PCI power management reset
+         * method doesn't work (P800, for example.)
+         * In those cases, don't try to proceed, as it generally doesn't work.
+         */
+        active_transport = readl(&cfgtable->TransportActive);
+        if (active_transport & PERFORMANT_MODE) {
+                dev_warn(&pdev->dev, "Unable to successfully reset controller,"
+                        " Ignoring controller.\n");
+                rc = -ENODEV;
+        }
+
+unmap_cfgtable:
+        iounmap(cfgtable);
+
+unmap_vaddr:
+        iounmap(vaddr);
+        return rc;
+}
+
+static __devinit int cciss_init_reset_devices(struct pci_dev *pdev)
+{
+        int rc, i;
+
+        if (!reset_devices)
+                return 0;
+
+        /* Reset the controller with a PCI power-cycle or via doorbell */
+        rc = cciss_kdump_hard_reset_controller(pdev);
+
+        /* -ENOTSUPP here means we cannot reset the controller
+         * but it's already (and still) up and running in
+         * "performant mode".  Or, it might be 640x, which can't reset
+         * due to concerns about shared bbwc between 6402/6404 pair.
+         */
+        if (rc == -ENOTSUPP)
+                return 0; /* just try to do the kdump anyhow. */
+        if (rc)
+                return -ENODEV;
+        if (cciss_reset_msi(pdev))
+                return -ENODEV;
+
+        /* Now try to get the controller to respond to a no-op */
+        for (i = 0; i < CCISS_POST_RESET_NOOP_RETRIES; i++) {
+                if (cciss_noop(pdev) == 0)
+                        break;
+                else
+                        dev_warn(&pdev->dev, "no-op failed%s\n",
+                                (i < CCISS_POST_RESET_NOOP_RETRIES - 1 ?
+                                        "; re-trying" : ""));
+                msleep(CCISS_POST_RESET_NOOP_INTERVAL_MSECS);
+        }
         return 0;
 }
 
@@ -4166,46 +4612,31 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
         int rc;
         int dac, return_code;
         InquiryData_struct *inq_buff;
+        ctlr_info_t *h;
 
-        if (reset_devices) {
-                /* Reset the controller with a PCI power-cycle */
-                if (cciss_hard_reset_controller(pdev) || cciss_reset_msi(pdev))
-                        return -ENODEV;
-
-                /* Now try to get the controller to respond to a no-op. Some
-                   devices (notably the HP Smart Array 5i Controller) need
-                   up to 30 seconds to respond. */
-                for (i=0; i<30; i++) {
-                        if (cciss_noop(pdev) == 0)
-                                break;
-
-                        schedule_timeout_uninterruptible(HZ);
-                }
-                if (i == 30) {
-                        printk(KERN_ERR "cciss: controller seems dead\n");
-                        return -EBUSY;
-                }
-        }
-
-        i = alloc_cciss_hba();
+        rc = cciss_init_reset_devices(pdev);
+        if (rc)
+                return rc;
+        i = alloc_cciss_hba(pdev);
         if (i < 0)
                 return -1;
 
-        hba[i]->busy_initializing = 1;
-        INIT_HLIST_HEAD(&hba[i]->cmpQ);
-        INIT_HLIST_HEAD(&hba[i]->reqQ);
-        mutex_init(&hba[i]->busy_shutting_down);
+        h = hba[i];
+        h->pdev = pdev;
+        h->busy_initializing = 1;
+        INIT_HLIST_HEAD(&h->cmpQ);
+        INIT_HLIST_HEAD(&h->reqQ);
+        mutex_init(&h->busy_shutting_down);
 
-        if (cciss_pci_init(hba[i], pdev) != 0)
+        if (cciss_pci_init(h) != 0)
                 goto clean_no_release_regions;
 
-        sprintf(hba[i]->devname, "cciss%d", i);
-        hba[i]->ctlr = i;
-        hba[i]->pdev = pdev;
+        sprintf(h->devname, "cciss%d", i);
+        h->ctlr = i;
 
-        init_completion(&hba[i]->scan_wait);
+        init_completion(&h->scan_wait);
 
-        if (cciss_create_hba_sysfs_entry(hba[i]))
+        if (cciss_create_hba_sysfs_entry(h))
                 goto clean0;
 
         /* configure PCI DMA stuff */
@@ -4214,7 +4645,7 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
         else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))
                 dac = 0;
         else {
-                printk(KERN_ERR "cciss: no suitable DMA available\n");
+                dev_err(&h->pdev->dev, "no suitable DMA available\n");
                 goto clean1;
         }
 
@@ -4224,151 +4655,161 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
          * 8 controller support.
          */
         if (i < MAX_CTLR_ORIG)
-                hba[i]->major = COMPAQ_CISS_MAJOR + i;
-        rc = register_blkdev(hba[i]->major, hba[i]->devname);
+                h->major = COMPAQ_CISS_MAJOR + i;
+        rc = register_blkdev(h->major, h->devname);
         if (rc == -EBUSY || rc == -EINVAL) {
-                printk(KERN_ERR
-                       "cciss:  Unable to get major number %d for %s "
-                       "on hba %d\n", hba[i]->major, hba[i]->devname, i);
+                dev_err(&h->pdev->dev,
+                       "Unable to get major number %d for %s "
+                       "on hba %d\n", h->major, h->devname, i);
                 goto clean1;
         } else {
                 if (i >= MAX_CTLR_ORIG)
-                        hba[i]->major = rc;
+                        h->major = rc;
         }
 
         /* make sure the board interrupts are off */
-        hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_OFF);
-        if (request_irq(hba[i]->intr[SIMPLE_MODE_INT], do_cciss_intr,
-                        IRQF_DISABLED | IRQF_SHARED, hba[i]->devname, hba[i])) {
-                printk(KERN_ERR "cciss: Unable to get irq %d for %s\n",
-                       hba[i]->intr[SIMPLE_MODE_INT], hba[i]->devname);
-                goto clean2;
+        h->access.set_intr_mask(h, CCISS_INTR_OFF);
+        if (h->msi_vector || h->msix_vector) {
+                if (request_irq(h->intr[PERF_MODE_INT],
+                                do_cciss_msix_intr,
+                                IRQF_DISABLED, h->devname, h)) {
+                        dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n",
+                               h->intr[PERF_MODE_INT], h->devname);
+                        goto clean2;
+                }
+        } else {
+                if (request_irq(h->intr[PERF_MODE_INT], do_cciss_intx,
+                                IRQF_DISABLED, h->devname, h)) {
+                        dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n",
+                               h->intr[PERF_MODE_INT], h->devname);
+                        goto clean2;
+                }
         }
 
-        printk(KERN_INFO "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n",
-               hba[i]->devname, pdev->device, pci_name(pdev),
-               hba[i]->intr[SIMPLE_MODE_INT], dac ? "" : " not");
+        dev_info(&h->pdev->dev, "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n",
+               h->devname, pdev->device, pci_name(pdev),
+               h->intr[PERF_MODE_INT], dac ? "" : " not");
 
-        hba[i]->cmd_pool_bits =
-            kmalloc(DIV_ROUND_UP(hba[i]->nr_cmds, BITS_PER_LONG)
+        h->cmd_pool_bits =
+            kmalloc(DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG)
                         * sizeof(unsigned long), GFP_KERNEL);
-        hba[i]->cmd_pool = (CommandList_struct *)
-            pci_alloc_consistent(hba[i]->pdev,
-                    hba[i]->nr_cmds * sizeof(CommandList_struct),
-                    &(hba[i]->cmd_pool_dhandle));
-        hba[i]->errinfo_pool = (ErrorInfo_struct *)
-            pci_alloc_consistent(hba[i]->pdev,
-                    hba[i]->nr_cmds * sizeof(ErrorInfo_struct),
-                    &(hba[i]->errinfo_pool_dhandle));
-        if ((hba[i]->cmd_pool_bits == NULL)
-            || (hba[i]->cmd_pool == NULL)
-            || (hba[i]->errinfo_pool == NULL)) {
-                printk(KERN_ERR "cciss: out of memory");
+        h->cmd_pool = (CommandList_struct *)
+            pci_alloc_consistent(h->pdev,
+                    h->nr_cmds * sizeof(CommandList_struct),
+                    &(h->cmd_pool_dhandle));
+        h->errinfo_pool = (ErrorInfo_struct *)
+            pci_alloc_consistent(h->pdev,
+                    h->nr_cmds * sizeof(ErrorInfo_struct),
+                    &(h->errinfo_pool_dhandle));
+        if ((h->cmd_pool_bits == NULL)
+            || (h->cmd_pool == NULL)
+            || (h->errinfo_pool == NULL)) {
+                dev_err(&h->pdev->dev, "out of memory");
                 goto clean4;
         }
 
         /* Need space for temp scatter list */
-        hba[i]->scatter_list = kmalloc(hba[i]->max_commands *
+        h->scatter_list = kmalloc(h->max_commands *
                                                 sizeof(struct scatterlist *),
                                                 GFP_KERNEL);
-        for (k = 0; k < hba[i]->nr_cmds; k++) {
-                hba[i]->scatter_list[k] = kmalloc(sizeof(struct scatterlist) *
-                                                        hba[i]->maxsgentries,
+        for (k = 0; k < h->nr_cmds; k++) {
+                h->scatter_list[k] = kmalloc(sizeof(struct scatterlist) *
+                                                        h->maxsgentries,
                                                         GFP_KERNEL);
-                if (hba[i]->scatter_list[k] == NULL) {
-                        printk(KERN_ERR "cciss%d: could not allocate "
-                                "s/g lists\n", i);
+                if (h->scatter_list[k] == NULL) {
+                        dev_err(&h->pdev->dev,
+                                "could not allocate s/g lists\n");
                         goto clean4;
                 }
         }
-        hba[i]->cmd_sg_list = cciss_allocate_sg_chain_blocks(hba[i],
-                hba[i]->chainsize, hba[i]->nr_cmds);
-        if (!hba[i]->cmd_sg_list && hba[i]->chainsize > 0)
+        h->cmd_sg_list = cciss_allocate_sg_chain_blocks(h,
+                h->chainsize, h->nr_cmds);
+        if (!h->cmd_sg_list && h->chainsize > 0)
                 goto clean4;
 
-        spin_lock_init(&hba[i]->lock);
+        spin_lock_init(&h->lock);
 
         /* Initialize the pdev driver private data.
-           have it point to hba[i].  */
-        pci_set_drvdata(pdev, hba[i]);
+           have it point to h.  */
+        pci_set_drvdata(pdev, h);
         /* command and error info recs zeroed out before
            they are used */
-        memset(hba[i]->cmd_pool_bits, 0,
-               DIV_ROUND_UP(hba[i]->nr_cmds, BITS_PER_LONG)
+        memset(h->cmd_pool_bits, 0,
+               DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG)
                         * sizeof(unsigned long));
 
-        hba[i]->num_luns = 0;
-        hba[i]->highest_lun = -1;
+        h->num_luns = 0;
+        h->highest_lun = -1;
         for (j = 0; j < CISS_MAX_LUN; j++) {
-                hba[i]->drv[j] = NULL;
-                hba[i]->gendisk[j] = NULL;
+                h->drv[j] = NULL;
+                h->gendisk[j] = NULL;
         }
 
-        cciss_scsi_setup(i);
+        cciss_scsi_setup(h);
 
         /* Turn the interrupts on so we can service requests */
-        hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_ON);
+        h->access.set_intr_mask(h, CCISS_INTR_ON);
 
         /* Get the firmware version */
         inq_buff = kzalloc(sizeof(InquiryData_struct), GFP_KERNEL);
         if (inq_buff == NULL) {
-                printk(KERN_ERR "cciss: out of memory\n");
+                dev_err(&h->pdev->dev, "out of memory\n");
                 goto clean4;
         }
 
-        return_code = sendcmd_withirq(CISS_INQUIRY, i, inq_buff,
+        return_code = sendcmd_withirq(h, CISS_INQUIRY, inq_buff,
                 sizeof(InquiryData_struct), 0, CTLR_LUNID, TYPE_CMD);
         if (return_code == IO_OK) {
-                hba[i]->firm_ver[0] = inq_buff->data_byte[32];
-                hba[i]->firm_ver[1] = inq_buff->data_byte[33];
-                hba[i]->firm_ver[2] = inq_buff->data_byte[34];
-                hba[i]->firm_ver[3] = inq_buff->data_byte[35];
+                h->firm_ver[0] = inq_buff->data_byte[32];
+                h->firm_ver[1] = inq_buff->data_byte[33];
+                h->firm_ver[2] = inq_buff->data_byte[34];
+                h->firm_ver[3] = inq_buff->data_byte[35];
         } else {         /* send command failed */
-                printk(KERN_WARNING "cciss: unable to determine firmware"
+                dev_warn(&h->pdev->dev, "unable to determine firmware"
                         " version of controller\n");
         }
         kfree(inq_buff);
 
-        cciss_procinit(i);
+        cciss_procinit(h);
 
-        hba[i]->cciss_max_sectors = 8192;
+        h->cciss_max_sectors = 8192;
 
-        rebuild_lun_table(hba[i], 1, 0);
-        hba[i]->busy_initializing = 0;
+        rebuild_lun_table(h, 1, 0);
+        h->busy_initializing = 0;
         return 1;
 
 clean4:
-        kfree(hba[i]->cmd_pool_bits);
+        kfree(h->cmd_pool_bits);
         /* Free up sg elements */
-        for (k = 0; k < hba[i]->nr_cmds; k++)
-                kfree(hba[i]->scatter_list[k]);
-        kfree(hba[i]->scatter_list);
-        cciss_free_sg_chain_blocks(hba[i]->cmd_sg_list, hba[i]->nr_cmds);
-        if (hba[i]->cmd_pool)
-                pci_free_consistent(hba[i]->pdev,
-                                    hba[i]->nr_cmds * sizeof(CommandList_struct),
-                                    hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
-        if (hba[i]->errinfo_pool)
-                pci_free_consistent(hba[i]->pdev,
-                                    hba[i]->nr_cmds * sizeof(ErrorInfo_struct),
-                                    hba[i]->errinfo_pool,
-                                    hba[i]->errinfo_pool_dhandle);
-        free_irq(hba[i]->intr[SIMPLE_MODE_INT], hba[i]);
+        for (k = 0; k < h->nr_cmds; k++)
+                kfree(h->scatter_list[k]);
+        kfree(h->scatter_list);
+        cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
+        if (h->cmd_pool)
+                pci_free_consistent(h->pdev,
+                                    h->nr_cmds * sizeof(CommandList_struct),
+                                    h->cmd_pool, h->cmd_pool_dhandle);
+        if (h->errinfo_pool)
+                pci_free_consistent(h->pdev,
+                                    h->nr_cmds * sizeof(ErrorInfo_struct),
+                                    h->errinfo_pool,
+                                    h->errinfo_pool_dhandle);
+        free_irq(h->intr[PERF_MODE_INT], h);
 clean2:
-        unregister_blkdev(hba[i]->major, hba[i]->devname);
+        unregister_blkdev(h->major, h->devname);
 clean1:
-        cciss_destroy_hba_sysfs_entry(hba[i]);
+        cciss_destroy_hba_sysfs_entry(h);
 clean0:
         pci_release_regions(pdev);
 clean_no_release_regions:
-        hba[i]->busy_initializing = 0;
+        h->busy_initializing = 0;
 
         /*
          * Deliberately omit pci_disable_device(): it does something nasty to
          * Smart Array controllers that pci_enable_device does not undo
          */
         pci_set_drvdata(pdev, NULL);
-        free_hba(i);
+        free_hba(h);
         return -1;
 }
 
@@ -4381,55 +4822,51 @@ static void cciss_shutdown(struct pci_dev *pdev)
         h = pci_get_drvdata(pdev);
         flush_buf = kzalloc(4, GFP_KERNEL);
         if (!flush_buf) {
-                printk(KERN_WARNING
-                        "cciss:%d cache not flushed, out of memory.\n",
-                        h->ctlr);
+                dev_warn(&h->pdev->dev, "cache not flushed, out of memory.\n");
                 return;
         }
         /* write all data in the battery backed cache to disk */
         memset(flush_buf, 0, 4);
-        return_code = sendcmd_withirq(CCISS_CACHE_FLUSH, h->ctlr, flush_buf,
+        return_code = sendcmd_withirq(h, CCISS_CACHE_FLUSH, flush_buf,
                 4, 0, CTLR_LUNID, TYPE_CMD);
         kfree(flush_buf);
         if (return_code != IO_OK)
-                printk(KERN_WARNING "cciss%d: Error flushing cache\n",
-                        h->ctlr);
+                dev_warn(&h->pdev->dev, "Error flushing cache\n");
         h->access.set_intr_mask(h, CCISS_INTR_OFF);
-        free_irq(h->intr[2], h);
+        free_irq(h->intr[PERF_MODE_INT], h);
 }
 
 static void __devexit cciss_remove_one(struct pci_dev *pdev)
 {
-        ctlr_info_t *tmp_ptr;
+        ctlr_info_t *h;
         int i, j;
 
         if (pci_get_drvdata(pdev) == NULL) {
-                printk(KERN_ERR "cciss: Unable to remove device \n");
+                dev_err(&pdev->dev, "Unable to remove device\n");
                 return;
         }
 
-        tmp_ptr = pci_get_drvdata(pdev);
-        i = tmp_ptr->ctlr;
+        h = pci_get_drvdata(pdev);
+        i = h->ctlr;
         if (hba[i] == NULL) {
-                printk(KERN_ERR "cciss: device appears to "
-                       "already be removed \n");
+                dev_err(&pdev->dev, "device appears to already be removed\n");
                 return;
         }
 
-        mutex_lock(&hba[i]->busy_shutting_down);
+        mutex_lock(&h->busy_shutting_down);
 
-        remove_from_scan_list(hba[i]);
-        remove_proc_entry(hba[i]->devname, proc_cciss);
-        unregister_blkdev(hba[i]->major, hba[i]->devname);
+        remove_from_scan_list(h);
+        remove_proc_entry(h->devname, proc_cciss);
+        unregister_blkdev(h->major, h->devname);
 
         /* remove it from the disk list */
         for (j = 0; j < CISS_MAX_LUN; j++) {
-                struct gendisk *disk = hba[i]->gendisk[j];
+                struct gendisk *disk = h->gendisk[j];
                 if (disk) {
                         struct request_queue *q = disk->queue;
 
                         if (disk->flags & GENHD_FL_UP) {
-                                cciss_destroy_ld_sysfs_entry(hba[i], j, 1);
+                                cciss_destroy_ld_sysfs_entry(h, j, 1);
                                 del_gendisk(disk);
                         }
                         if (q)
@@ -4438,39 +4875,41 @@ static void __devexit cciss_remove_one(struct pci_dev *pdev)
         }
 
 #ifdef CONFIG_CISS_SCSI_TAPE
-        cciss_unregister_scsi(i);       /* unhook from SCSI subsystem */
+        cciss_unregister_scsi(h);       /* unhook from SCSI subsystem */
 #endif
 
         cciss_shutdown(pdev);
 
 #ifdef CONFIG_PCI_MSI
-        if (hba[i]->msix_vector)
-                pci_disable_msix(hba[i]->pdev);
-        else if (hba[i]->msi_vector)
-                pci_disable_msi(hba[i]->pdev);
+        if (h->msix_vector)
+                pci_disable_msix(h->pdev);
+        else if (h->msi_vector)
+                pci_disable_msi(h->pdev);
 #endif                          /* CONFIG_PCI_MSI */
 
-        iounmap(hba[i]->vaddr);
+        iounmap(h->transtable);
+        iounmap(h->cfgtable);
+        iounmap(h->vaddr);
 
-        pci_free_consistent(hba[i]->pdev, hba[i]->nr_cmds * sizeof(CommandList_struct),
-                            hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
-        pci_free_consistent(hba[i]->pdev, hba[i]->nr_cmds * sizeof(ErrorInfo_struct),
-                            hba[i]->errinfo_pool, hba[i]->errinfo_pool_dhandle);
-        kfree(hba[i]->cmd_pool_bits);
+        pci_free_consistent(h->pdev, h->nr_cmds * sizeof(CommandList_struct),
+                            h->cmd_pool, h->cmd_pool_dhandle);
+        pci_free_consistent(h->pdev, h->nr_cmds * sizeof(ErrorInfo_struct),
+                            h->errinfo_pool, h->errinfo_pool_dhandle);
+        kfree(h->cmd_pool_bits);
         /* Free up sg elements */
-        for (j = 0; j < hba[i]->nr_cmds; j++)
-                kfree(hba[i]->scatter_list[j]);
-        kfree(hba[i]->scatter_list);
-        cciss_free_sg_chain_blocks(hba[i]->cmd_sg_list, hba[i]->nr_cmds);
+        for (j = 0; j < h->nr_cmds; j++)
+                kfree(h->scatter_list[j]);
+        kfree(h->scatter_list);
+        cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
         /*
          * Deliberately omit pci_disable_device(): it does something nasty to
          * Smart Array controllers that pci_enable_device does not undo
          */
         pci_release_regions(pdev);
         pci_set_drvdata(pdev, NULL);
-        cciss_destroy_hba_sysfs_entry(hba[i]);
-        mutex_unlock(&hba[i]->busy_shutting_down);
-        free_hba(i);
+        cciss_destroy_hba_sysfs_entry(h);
+        mutex_unlock(&h->busy_shutting_down);
+        free_hba(h);
 }
 
 static struct pci_driver cciss_pci_driver = {
@@ -4495,7 +4934,6 @@ static int __init cciss_init(void)
          * array of them, the size must be a multiple of 8 bytes.
          */
         BUILD_BUG_ON(sizeof(CommandList_struct) % COMMANDLIST_ALIGNMENT);
-
         printk(KERN_INFO DRIVER_NAME "\n");
 
         err = bus_register(&cciss_bus_type);
@@ -4532,8 +4970,8 @@ static void __exit cciss_cleanup(void)
         /* double check that all controller entrys have been removed */
         for (i = 0; i < MAX_CTLR; i++) {
                 if (hba[i] != NULL) {
-                        printk(KERN_WARNING "cciss: had to remove"
-                               " controller %d\n", i);
+                        dev_warn(&hba[i]->pdev->dev,
+                                "had to remove controller\n");
                         cciss_remove_one(hba[i]->pdev);
                 }
         }
@@ -4542,46 +4980,5 @@ static void __exit cciss_cleanup(void)
         bus_unregister(&cciss_bus_type);
 }
 
-static void fail_all_cmds(unsigned long ctlr)
-{
-        /* If we get here, the board is apparently dead. */
-        ctlr_info_t *h = hba[ctlr];
-        CommandList_struct *c;
-        unsigned long flags;
-
-        printk(KERN_WARNING "cciss%d: controller not responding.\n", h->ctlr);
-        h->alive = 0;           /* the controller apparently died... */
-
-        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-
-        pci_disable_device(h->pdev);    /* Make sure it is really dead. */
-
-        /* move everything off the request queue onto the completed queue */
-        while (!hlist_empty(&h->reqQ)) {
-                c = hlist_entry(h->reqQ.first, CommandList_struct, list);
-                removeQ(c);
-                h->Qdepth--;
-                addQ(&h->cmpQ, c);
-        }
-
-        /* Now, fail everything on the completed queue with a HW error */
-        while (!hlist_empty(&h->cmpQ)) {
-                c = hlist_entry(h->cmpQ.first, CommandList_struct, list);
-                removeQ(c);
-                if (c->cmd_type != CMD_MSG_STALE)
-                        c->err_info->CommandStatus = CMD_HARDWARE_ERR;
-                if (c->cmd_type == CMD_RWREQ) {
-                        complete_command(h, c, 0);
-                } else if (c->cmd_type == CMD_IOCTL_PEND)
-                        complete(c->waiting);
-#ifdef CONFIG_CISS_SCSI_TAPE
-                else if (c->cmd_type == CMD_SCSI)
-                        complete_scsi_command(c, 0, 0);
-#endif
-        }
-        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-        return;
-}
-
 module_init(cciss_init);
 module_exit(cciss_cleanup);
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index c5d411174db0..ae340ffc8f81 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -25,7 +25,7 @@ struct access_method {
         void (*submit_command)(ctlr_info_t *h, CommandList_struct *c);
         void (*set_intr_mask)(ctlr_info_t *h, unsigned long val);
         unsigned long (*fifo_full)(ctlr_info_t *h);
-        unsigned long (*intr_pending)(ctlr_info_t *h);
+        bool (*intr_pending)(ctlr_info_t *h);
         unsigned long (*command_completed)(ctlr_info_t *h);
 };
 typedef struct _drive_info_struct
@@ -85,8 +85,8 @@ struct ctlr_info
         int     max_cmd_sgentries;
         SGDescriptor_struct **cmd_sg_list;
 
-#       define DOORBELL_INT     0
-#       define PERF_MODE_INT    1
+#       define PERF_MODE_INT    0
+#       define DOORBELL_INT     1
 #       define SIMPLE_MODE_INT  2
 #       define MEMQ_MODE_INT    3
         unsigned int intr[4];
@@ -137,10 +137,27 @@ struct ctlr_info
         struct list_head scan_list;
         struct completion scan_wait;
         struct device dev;
+        /*
+         * Performant mode tables.
+         */
+        u32 trans_support;
+        u32 trans_offset;
+        struct TransTable_struct *transtable;
+        unsigned long transMethod;
+
+        /*
+         * Performant mode completion buffer
+         */
+        u64 *reply_pool;
+        dma_addr_t reply_pool_dhandle;
+        u64 *reply_pool_head;
+        size_t reply_pool_size;
+        unsigned char reply_pool_wraparound;
+        u32 *blockFetchTable;
 };
 
-/*  Defining the diffent access_menthods */
-/*
+/*  Defining the diffent access_methods
+ *
  * Memory mapped FIFO interface (SMART 53xx cards)
  */
 #define SA5_DOORBELL    0x20
@@ -159,19 +176,47 @@ struct ctlr_info
 #define SA5B_INTR_PENDING       0x04
 #define FIFO_EMPTY              0xffffffff      
 #define CCISS_FIRMWARE_READY    0xffff0000 /* value in scratchpad register */
+/* Perf. mode flags */
+#define SA5_PERF_INTR_PENDING   0x04
+#define SA5_PERF_INTR_OFF       0x05
+#define SA5_OUTDB_STATUS_PERF_BIT       0x01
+#define SA5_OUTDB_CLEAR_PERF_BIT        0x01
+#define SA5_OUTDB_CLEAR         0xA0
+#define SA5_OUTDB_CLEAR_PERF_BIT        0x01
+#define SA5_OUTDB_STATUS        0x9C
+
 
 #define  CISS_ERROR_BIT         0x02
 
 #define CCISS_INTR_ON   1 
 #define CCISS_INTR_OFF  0
+
+
+/* CCISS_BOARD_READY_WAIT_SECS is how long to wait for a board
+ * to become ready, in seconds, before giving up on it.
+ * CCISS_BOARD_READY_POLL_INTERVAL_MSECS * is how long to wait
+ * between polling the board to see if it is ready, in
+ * milliseconds.  CCISS_BOARD_READY_ITERATIONS is derived
+ * the above.
+ */
+#define CCISS_BOARD_READY_WAIT_SECS (120)
+#define CCISS_BOARD_READY_POLL_INTERVAL_MSECS (100)
+#define CCISS_BOARD_READY_ITERATIONS \
+        ((CCISS_BOARD_READY_WAIT_SECS * 1000) / \
+                CCISS_BOARD_READY_POLL_INTERVAL_MSECS)
+#define CCISS_POST_RESET_PAUSE_MSECS (3000)
+#define CCISS_POST_RESET_NOOP_INTERVAL_MSECS (1000)
+#define CCISS_POST_RESET_NOOP_RETRIES (12)
+
 /* 
         Send the command to the hardware 
 */
 static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c) 
 {
 #ifdef CCISS_DEBUG
-         printk("Sending %x - down to controller\n", c->busaddr );
-#endif /* CCISS_DEBUG */ 
+        printk(KERN_WARNING "cciss%d: Sending %08x - down to controller\n",
+                        h->ctlr, c->busaddr);
+#endif /* CCISS_DEBUG */
          writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
          h->commands_outstanding++;
          if ( h->commands_outstanding > h->max_outstanding)
@@ -214,6 +259,20 @@ static void SA5B_intr_mask(ctlr_info_t *h, unsigned long val)
                         h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
         }
 }
+
+/* Performant mode intr_mask */
+static void SA5_performant_intr_mask(ctlr_info_t *h, unsigned long val)
+{
+        if (val) { /* turn on interrupts */
+                h->interrupts_enabled = 1;
+                writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
+        } else {
+                h->interrupts_enabled = 0;
+                writel(SA5_PERF_INTR_OFF,
+                                h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
+        }
+}
+
 /*
  *  Returns true if fifo is full.  
  * 
@@ -250,10 +309,44 @@ static unsigned long SA5_completed(ctlr_info_t *h)
         return ( register_value); 
 
 }
+
+/* Performant mode command completed */
+static unsigned long SA5_performant_completed(ctlr_info_t *h)
+{
+        unsigned long register_value = FIFO_EMPTY;
+
+        /* flush the controller write of the reply queue by reading
+         * outbound doorbell status register.
+         */
+        register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
+        /* msi auto clears the interrupt pending bit. */
+        if (!(h->msi_vector || h->msix_vector)) {
+                writel(SA5_OUTDB_CLEAR_PERF_BIT, h->vaddr + SA5_OUTDB_CLEAR);
+                /* Do a read in order to flush the write to the controller
+                 * (as per spec.)
+                 */
+                register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
+        }
+
+        if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
+                register_value = *(h->reply_pool_head);
+                (h->reply_pool_head)++;
+                h->commands_outstanding--;
+        } else {
+                register_value = FIFO_EMPTY;
+        }
+        /* Check for wraparound */
+        if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
+                h->reply_pool_head = h->reply_pool;
+                h->reply_pool_wraparound ^= 1;
+        }
+
+        return register_value;
+}
 /*
  *      Returns true if an interrupt is pending.. 
  */
-static unsigned long SA5_intr_pending(ctlr_info_t *h)
+static bool SA5_intr_pending(ctlr_info_t *h)
 {
         unsigned long register_value  = 
                 readl(h->vaddr + SA5_INTR_STATUS);
@@ -268,7 +361,7 @@ static unsigned long SA5_intr_pending(ctlr_info_t *h)
 /*
  *      Returns true if an interrupt is pending..
  */
-static unsigned long SA5B_intr_pending(ctlr_info_t *h)
+static bool SA5B_intr_pending(ctlr_info_t *h)
 {
         unsigned long register_value  =
                 readl(h->vaddr + SA5_INTR_STATUS);
@@ -280,6 +373,20 @@ static unsigned long SA5B_intr_pending(ctlr_info_t *h)
         return 0 ;
 }
 
+static bool SA5_performant_intr_pending(ctlr_info_t *h)
+{
+        unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);
+
+        if (!register_value)
+                return false;
+
+        if (h->msi_vector || h->msix_vector)
+                return true;
+
+        /* Read outbound doorbell to flush */
+        register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
+        return register_value & SA5_OUTDB_STATUS_PERF_BIT;
+}
 
 static struct access_method SA5_access = {
         SA5_submit_command,
@@ -297,6 +404,14 @@ static struct access_method SA5B_access = {
         SA5_completed,
 };
 
+static struct access_method SA5_performant_access = {
+        SA5_submit_command,
+        SA5_performant_intr_mask,
+        SA5_fifo_full,
+        SA5_performant_intr_pending,
+        SA5_performant_completed,
+};
+
 struct board_type {
         __u32   board_id;
         char    *product_name;
@@ -304,6 +419,4 @@ struct board_type {
         int nr_cmds; /* Max cmds this kind of ctlr can handle. */
 };
 
-#define CCISS_LOCK(i)   (&hba[i]->lock)
-
 #endif /* CCISS_H */
diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h
index e624ff959cb6..eb060f1b00b6 100644
--- a/drivers/block/cciss_cmd.h
+++ b/drivers/block/cciss_cmd.h
@@ -52,8 +52,10 @@
 /* Configuration Table */
 #define CFGTBL_ChangeReq        0x00000001l
 #define CFGTBL_AccCmds          0x00000001l
+#define DOORBELL_CTLR_RESET     0x00000004l
 
 #define CFGTBL_Trans_Simple     0x00000002l
+#define CFGTBL_Trans_Performant 0x00000004l
 
 #define CFGTBL_BusType_Ultra2   0x00000001l
 #define CFGTBL_BusType_Ultra3   0x00000002l
@@ -173,12 +175,15 @@ typedef struct _SGDescriptor_struct {
  * PAD_64 can be adjusted independently as needed for 32-bit
  * and 64-bits systems.
  */
-#define COMMANDLIST_ALIGNMENT (8)
+#define COMMANDLIST_ALIGNMENT (32)
 #define IS_64_BIT ((sizeof(long) - 4)/4)
 #define IS_32_BIT (!IS_64_BIT)
 #define PAD_32 (0)
 #define PAD_64 (4)
 #define PADSIZE (IS_32_BIT * PAD_32 + IS_64_BIT * PAD_64)
+#define DIRECT_LOOKUP_BIT 0x10
+#define DIRECT_LOOKUP_SHIFT 5
+
 typedef struct _CommandList_struct {
   CommandListHeader_struct Header;
   RequestBlock_struct      Request;
@@ -195,7 +200,7 @@ typedef struct _CommandList_struct {
   struct completion *waiting;
   int    retry_count;
   void * scsi_cmd;
-  char   pad[PADSIZE];
+  char pad[PADSIZE];
 } CommandList_struct;
 
 /* Configuration Table Structure */
@@ -209,12 +214,15 @@ typedef struct _HostWrite_struct {
 typedef struct _CfgTable_struct {
   BYTE             Signature[4];
   DWORD            SpecValence;
+#define SIMPLE_MODE     0x02
+#define PERFORMANT_MODE 0x04
+#define MEMQ_MODE       0x08
   DWORD            TransportSupport;
   DWORD            TransportActive;
   HostWrite_struct HostWrite;
   DWORD            CmdsOutMax;
   DWORD            BusTypes;
-  DWORD            Reserved; 
+  DWORD            TransMethodOffset;
   BYTE             ServerName[16];
   DWORD            HeartBeat;
   DWORD            SCSI_Prefetch;
@@ -222,6 +230,28 @@ typedef struct _CfgTable_struct {
   DWORD            MaxLogicalUnits;
   DWORD            MaxPhysicalDrives;
   DWORD            MaxPhysicalDrivesPerLogicalUnit;
+  DWORD            MaxPerformantModeCommands;
+  u8               reserved[0x78 - 0x58];
+  u32              misc_fw_support; /* offset 0x78 */
+#define MISC_FW_DOORBELL_RESET (0x02)
 } CfgTable_struct;
+
+struct TransTable_struct {
+  u32 BlockFetch0;
+  u32 BlockFetch1;
+  u32 BlockFetch2;
+  u32 BlockFetch3;
+  u32 BlockFetch4;
+  u32 BlockFetch5;
+  u32 BlockFetch6;
+  u32 BlockFetch7;
+  u32 RepQSize;
+  u32 RepQCount;
+  u32 RepQCtrAddrLow32;
+  u32 RepQCtrAddrHigh32;
+  u32 RepQAddr0Low32;
+  u32 RepQAddr0High32;
+};
+
 #pragma pack()   
 #endif /* CCISS_CMD_H */
diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index 72dae92f3cab..575495f3c4b8 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -44,13 +44,15 @@
 #define CCISS_ABORT_MSG 0x00
 #define CCISS_RESET_MSG 0x01
 
-static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
+static int fill_cmd(ctlr_info_t *h, CommandList_struct *c, __u8 cmd, void *buff,
         size_t size,
         __u8 page_code, unsigned char *scsi3addr,
         int cmd_type);
 
-static CommandList_struct *cmd_alloc(ctlr_info_t *h, int get_from_pool);
-static void cmd_free(ctlr_info_t *h, CommandList_struct *c, int got_from_pool);
+static CommandList_struct *cmd_alloc(ctlr_info_t *h);
+static CommandList_struct *cmd_special_alloc(ctlr_info_t *h);
+static void cmd_free(ctlr_info_t *h, CommandList_struct *c);
+static void cmd_special_free(ctlr_info_t *h, CommandList_struct *c);
 
 static int cciss_scsi_proc_info(
                 struct Scsi_Host *sh,
@@ -93,8 +95,8 @@ static struct scsi_host_template cciss_driver_template = {
 
 #pragma pack(1)
 
-#define SCSI_PAD_32 0
-#define SCSI_PAD_64 0
+#define SCSI_PAD_32 8
+#define SCSI_PAD_64 8
 
 struct cciss_scsi_cmd_stack_elem_t {
         CommandList_struct cmd;
@@ -127,16 +129,16 @@ struct cciss_scsi_adapter_data_t {
         spinlock_t lock; // to protect ccissscsi[ctlr]; 
 };
 
-#define CPQ_TAPE_LOCK(ctlr, flags) spin_lock_irqsave( \
-        &hba[ctlr]->scsi_ctlr->lock, flags);
-#define CPQ_TAPE_UNLOCK(ctlr, flags) spin_unlock_irqrestore( \
-        &hba[ctlr]->scsi_ctlr->lock, flags);
+#define CPQ_TAPE_LOCK(h, flags) spin_lock_irqsave( \
+        &h->scsi_ctlr->lock, flags);
+#define CPQ_TAPE_UNLOCK(h, flags) spin_unlock_irqrestore( \
+        &h->scsi_ctlr->lock, flags);
 
 static CommandList_struct *
 scsi_cmd_alloc(ctlr_info_t *h)
 {
         /* assume only one process in here at a time, locking done by caller. */
-        /* use CCISS_LOCK(ctlr) */
+        /* use h->lock */
         /* might be better to rewrite how we allocate scsi commands in a way that */
         /* needs no locking at all. */
 
@@ -177,10 +179,10 @@ scsi_cmd_alloc(ctlr_info_t *h)
 }
 
 static void 
-scsi_cmd_free(ctlr_info_t *h, CommandList_struct *cmd)
+scsi_cmd_free(ctlr_info_t *h, CommandList_struct *c)
 {
         /* assume only one process in here at a time, locking done by caller. */
-        /* use CCISS_LOCK(ctlr) */
+        /* use h->lock */
         /* drop the free memory chunk on top of the stack. */
 
         struct cciss_scsi_adapter_data_t *sa;
@@ -190,22 +192,23 @@ scsi_cmd_free(ctlr_info_t *h, CommandList_struct *cmd)
         stk = &sa->cmd_stack; 
         stk->top++;
         if (stk->top >= CMD_STACK_SIZE) {
-                printk("cciss: scsi_cmd_free called too many times.\n");
+                dev_err(&h->pdev->dev,
+                        "scsi_cmd_free called too many times.\n");
                 BUG();
         }
-        stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) cmd;
+        stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) c;
 }
 
 static int
-scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa)
+scsi_cmd_stack_setup(ctlr_info_t *h, struct cciss_scsi_adapter_data_t *sa)
 {
         int i;
         struct cciss_scsi_cmd_stack_t *stk;
         size_t size;
 
-        sa->cmd_sg_list = cciss_allocate_sg_chain_blocks(hba[ctlr],
-                hba[ctlr]->chainsize, CMD_STACK_SIZE);
-        if (!sa->cmd_sg_list && hba[ctlr]->chainsize > 0)
+        sa->cmd_sg_list = cciss_allocate_sg_chain_blocks(h,
+                h->chainsize, CMD_STACK_SIZE);
+        if (!sa->cmd_sg_list && h->chainsize > 0)
                 return -ENOMEM;
 
         stk = &sa->cmd_stack; 
@@ -215,7 +218,7 @@ scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa)
         BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0);
         /* pci_alloc_consistent guarantees 32-bit DMA address will be used */
         stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
-                pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle);
+                pci_alloc_consistent(h->pdev, size, &stk->cmd_pool_handle);
 
         if (stk->pool == NULL) {
                 cciss_free_sg_chain_blocks(sa->cmd_sg_list, CMD_STACK_SIZE);
@@ -234,23 +237,22 @@ scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa)
 }
 
 static void
-scsi_cmd_stack_free(int ctlr)
+scsi_cmd_stack_free(ctlr_info_t *h)
 {
         struct cciss_scsi_adapter_data_t *sa;
         struct cciss_scsi_cmd_stack_t *stk;
         size_t size;
 
-        sa = hba[ctlr]->scsi_ctlr;
+        sa = h->scsi_ctlr;
         stk = &sa->cmd_stack; 
         if (stk->top != CMD_STACK_SIZE-1) {
-                printk( "cciss: %d scsi commands are still outstanding.\n",
+                dev_warn(&h->pdev->dev,
+                        "bug: %d scsi commands are still outstanding.\n",
                         CMD_STACK_SIZE - stk->top);
-                // BUG();
-                printk("WE HAVE A BUG HERE!!! stk=0x%p\n", stk);
         }
         size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE;
 
-        pci_free_consistent(hba[ctlr]->pdev, size, stk->pool, stk->cmd_pool_handle);
+        pci_free_consistent(h->pdev, size, stk->pool, stk->cmd_pool_handle);
         stk->pool = NULL;
         cciss_free_sg_chain_blocks(sa->cmd_sg_list, CMD_STACK_SIZE);
 }
@@ -342,20 +344,20 @@ print_cmd(CommandList_struct *cp)
 #endif
 
 static int 
-find_bus_target_lun(int ctlr, int *bus, int *target, int *lun)
+find_bus_target_lun(ctlr_info_t *h, int *bus, int *target, int *lun)
 {
         /* finds an unused bus, target, lun for a new device */
-        /* assumes hba[ctlr]->scsi_ctlr->lock is held */ 
+        /* assumes h->scsi_ctlr->lock is held */
         int i, found=0;
         unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA];
 
         memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA);
 
         target_taken[SELF_SCSI_ID] = 1; 
-        for (i=0;i<ccissscsi[ctlr].ndevices;i++)
-                target_taken[ccissscsi[ctlr].dev[i].target] = 1;
+        for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++)
+                target_taken[ccissscsi[h->ctlr].dev[i].target] = 1;
         
-        for (i=0;i<CCISS_MAX_SCSI_DEVS_PER_HBA;i++) {
+        for (i = 0; i < CCISS_MAX_SCSI_DEVS_PER_HBA; i++) {
                 if (!target_taken[i]) {
                         *bus = 0; *target=i; *lun = 0; found=1;
                         break;
@@ -369,19 +371,19 @@ struct scsi2map {
 };
 
 static int 
-cciss_scsi_add_entry(int ctlr, int hostno, 
+cciss_scsi_add_entry(ctlr_info_t *h, int hostno,
                 struct cciss_scsi_dev_t *device,
                 struct scsi2map *added, int *nadded)
 {
-        /* assumes hba[ctlr]->scsi_ctlr->lock is held */ 
-        int n = ccissscsi[ctlr].ndevices;
+        /* assumes h->scsi_ctlr->lock is held */
+        int n = ccissscsi[h->ctlr].ndevices;
         struct cciss_scsi_dev_t *sd;
         int i, bus, target, lun;
         unsigned char addr1[8], addr2[8];
 
         if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
-                printk("cciss%d: Too many devices, "
-                        "some will be inaccessible.\n", ctlr);
+                dev_warn(&h->pdev->dev, "Too many devices, "
+                        "some will be inaccessible.\n");
                 return -1;
         }
 
@@ -397,7 +399,7 @@ cciss_scsi_add_entry(int ctlr, int hostno,
                 memcpy(addr1, device->scsi3addr, 8);
                 addr1[4] = 0;
                 for (i = 0; i < n; i++) {
-                        sd = &ccissscsi[ctlr].dev[i];
+                        sd = &ccissscsi[h->ctlr].dev[i];
                         memcpy(addr2, sd->scsi3addr, 8);
                         addr2[4] = 0;
                         /* differ only in byte 4? */
@@ -410,9 +412,9 @@ cciss_scsi_add_entry(int ctlr, int hostno,
                 }
         }
 
-        sd = &ccissscsi[ctlr].dev[n];
+        sd = &ccissscsi[h->ctlr].dev[n];
         if (lun == 0) {
-                if (find_bus_target_lun(ctlr,
+                if (find_bus_target_lun(h,
                         &sd->bus, &sd->target, &sd->lun) != 0)
                         return -1;
         } else {
@@ -431,37 +433,37 @@ cciss_scsi_add_entry(int ctlr, int hostno,
         memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
         sd->devtype = device->devtype;
 
-        ccissscsi[ctlr].ndevices++;
+        ccissscsi[h->ctlr].ndevices++;
 
         /* initially, (before registering with scsi layer) we don't 
            know our hostno and we don't want to print anything first 
            time anyway (the scsi layer's inquiries will show that info) */
         if (hostno != -1)
-                printk("cciss%d: %s device c%db%dt%dl%d added.\n", 
-                        ctlr, scsi_device_type(sd->devtype), hostno,
+                dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.\n",
+                        scsi_device_type(sd->devtype), hostno,
                         sd->bus, sd->target, sd->lun);
         return 0;
 }
 
 static void
-cciss_scsi_remove_entry(int ctlr, int hostno, int entry,
+cciss_scsi_remove_entry(ctlr_info_t *h, int hostno, int entry,
         struct scsi2map *removed, int *nremoved)
 {
-        /* assumes hba[ctlr]->scsi_ctlr->lock is held */ 
+        /* assumes h->ctlr]->scsi_ctlr->lock is held */
         int i;
         struct cciss_scsi_dev_t sd;
 
         if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return;
-        sd = ccissscsi[ctlr].dev[entry];
+        sd = ccissscsi[h->ctlr].dev[entry];
         removed[*nremoved].bus    = sd.bus;
         removed[*nremoved].target = sd.target;
         removed[*nremoved].lun    = sd.lun;
         (*nremoved)++;
-        for (i=entry;i<ccissscsi[ctlr].ndevices-1;i++)
-                ccissscsi[ctlr].dev[i] = ccissscsi[ctlr].dev[i+1];
-        ccissscsi[ctlr].ndevices--;
-        printk("cciss%d: %s device c%db%dt%dl%d removed.\n",
-                ctlr, scsi_device_type(sd.devtype), hostno,
+        for (i = entry; i < ccissscsi[h->ctlr].ndevices-1; i++)
+                ccissscsi[h->ctlr].dev[i] = ccissscsi[h->ctlr].dev[i+1];
+        ccissscsi[h->ctlr].ndevices--;
+        dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.\n",
+                scsi_device_type(sd.devtype), hostno,
                         sd.bus, sd.target, sd.lun);
 }
 
@@ -476,24 +478,24 @@ cciss_scsi_remove_entry(int ctlr, int hostno, int entry,
         (a)[1] == (b)[1] && \
         (a)[0] == (b)[0])
 
-static void fixup_botched_add(int ctlr, char *scsi3addr)
+static void fixup_botched_add(ctlr_info_t *h, char *scsi3addr)
 {
         /* called when scsi_add_device fails in order to re-adjust */
         /* ccissscsi[] to match the mid layer's view. */
         unsigned long flags;
         int i, j;
-        CPQ_TAPE_LOCK(ctlr, flags);
-        for (i = 0; i < ccissscsi[ctlr].ndevices; i++) {
+        CPQ_TAPE_LOCK(h, flags);
+        for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
                 if (memcmp(scsi3addr,
-                                ccissscsi[ctlr].dev[i].scsi3addr, 8) == 0) {
-                        for (j = i; j < ccissscsi[ctlr].ndevices-1; j++)
-                                ccissscsi[ctlr].dev[j] =
-                                        ccissscsi[ctlr].dev[j+1];
-                        ccissscsi[ctlr].ndevices--;
+                                ccissscsi[h->ctlr].dev[i].scsi3addr, 8) == 0) {
+                        for (j = i; j < ccissscsi[h->ctlr].ndevices-1; j++)
+                                ccissscsi[h->ctlr].dev[j] =
+                                        ccissscsi[h->ctlr].dev[j+1];
+                        ccissscsi[h->ctlr].ndevices--;
                         break;
                 }
         }
-        CPQ_TAPE_UNLOCK(ctlr, flags);
+        CPQ_TAPE_UNLOCK(h, flags);
 }
 
 static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
@@ -513,7 +515,7 @@ static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
 }
 
 static int
-adjust_cciss_scsi_table(int ctlr, int hostno,
+adjust_cciss_scsi_table(ctlr_info_t *h, int hostno,
         struct cciss_scsi_dev_t sd[], int nsds)
 {
         /* sd contains scsi3 addresses and devtypes, but
@@ -534,15 +536,15 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
                         GFP_KERNEL);
 
         if (!added || !removed) {
-                printk(KERN_WARNING "cciss%d: Out of memory in "
-                        "adjust_cciss_scsi_table\n", ctlr);
+                dev_warn(&h->pdev->dev,
+                        "Out of memory in adjust_cciss_scsi_table\n");
                 goto free_and_out;
         }
 
-        CPQ_TAPE_LOCK(ctlr, flags);
+        CPQ_TAPE_LOCK(h, flags);
 
         if (hostno != -1)  /* if it's not the first time... */
-                sh = hba[ctlr]->scsi_ctlr->scsi_host;
+                sh = h->scsi_ctlr->scsi_host;
 
         /* find any devices in ccissscsi[] that are not in 
            sd[] and remove them from ccissscsi[] */
@@ -550,8 +552,8 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
         i = 0;
         nremoved = 0;
         nadded = 0;
-        while(i<ccissscsi[ctlr].ndevices) {
-                csd = &ccissscsi[ctlr].dev[i];
+        while (i < ccissscsi[h->ctlr].ndevices) {
+                csd = &ccissscsi[h->ctlr].dev[i];
                 found=0;
                 for (j=0;j<nsds;j++) {
                         if (SCSI3ADDR_EQ(sd[j].scsi3addr,
@@ -566,20 +568,18 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
 
                 if (found == 0) { /* device no longer present. */ 
                         changes++;
-                        /* printk("cciss%d: %s device c%db%dt%dl%d removed.\n",
-                                ctlr, scsi_device_type(csd->devtype), hostno,
-                                        csd->bus, csd->target, csd->lun); */
-                        cciss_scsi_remove_entry(ctlr, hostno, i,
+                        cciss_scsi_remove_entry(h, hostno, i,
                                 removed, &nremoved);
                         /* remove ^^^, hence i not incremented */
                 } else if (found == 1) { /* device is different in some way */
                         changes++;
-                        printk("cciss%d: device c%db%dt%dl%d has changed.\n",
-                                ctlr, hostno, csd->bus, csd->target, csd->lun);
-                        cciss_scsi_remove_entry(ctlr, hostno, i,
+                        dev_info(&h->pdev->dev,
+                                "device c%db%dt%dl%d has changed.\n",
+                                hostno, csd->bus, csd->target, csd->lun);
+                        cciss_scsi_remove_entry(h, hostno, i,
                                 removed, &nremoved);
                         /* remove ^^^, hence i not incremented */
-                        if (cciss_scsi_add_entry(ctlr, hostno, &sd[j],
+                        if (cciss_scsi_add_entry(h, hostno, &sd[j],
                                 added, &nadded) != 0)
                                 /* we just removed one, so add can't fail. */
                                         BUG();
@@ -601,8 +601,8 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
 
         for (i=0;i<nsds;i++) {
                 found=0;
-                for (j=0;j<ccissscsi[ctlr].ndevices;j++) {
-                        csd = &ccissscsi[ctlr].dev[j];
+                for (j = 0; j < ccissscsi[h->ctlr].ndevices; j++) {
+                        csd = &ccissscsi[h->ctlr].dev[j];
                         if (SCSI3ADDR_EQ(sd[i].scsi3addr,
                                 csd->scsi3addr)) {
                                 if (device_is_the_same(&sd[i], csd))
@@ -614,18 +614,18 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
                 }
                 if (!found) {
                         changes++;
-                        if (cciss_scsi_add_entry(ctlr, hostno, &sd[i],
+                        if (cciss_scsi_add_entry(h, hostno, &sd[i],
                                 added, &nadded) != 0)
                                 break;
                 } else if (found == 1) {
                         /* should never happen... */
                         changes++;
-                        printk(KERN_WARNING "cciss%d: device "
-                                "unexpectedly changed\n", ctlr);
+                        dev_warn(&h->pdev->dev,
+                                "device unexpectedly changed\n");
                         /* but if it does happen, we just ignore that device */
                 }
         }
-        CPQ_TAPE_UNLOCK(ctlr, flags);
+        CPQ_TAPE_UNLOCK(h, flags);
 
         /* Don't notify scsi mid layer of any changes the first time through */
         /* (or if there are no changes) scsi_scan_host will do it later the */
@@ -645,9 +645,9 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
                         /* We don't expect to get here. */
                         /* future cmds to this device will get selection */
                         /* timeout as if the device was gone. */
-                        printk(KERN_WARNING "cciss%d: didn't find "
+                        dev_warn(&h->pdev->dev, "didn't find "
                                 "c%db%dt%dl%d\n for removal.",
-                                ctlr, hostno, removed[i].bus,
+                                hostno, removed[i].bus,
                                 removed[i].target, removed[i].lun);
                 }
         }
@@ -659,13 +659,12 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
                         added[i].target, added[i].lun);
                 if (rc == 0)
                         continue;
-                printk(KERN_WARNING "cciss%d: scsi_add_device "
+                dev_warn(&h->pdev->dev, "scsi_add_device "
                         "c%db%dt%dl%d failed, device not added.\n",
-                        ctlr, hostno,
-                        added[i].bus, added[i].target, added[i].lun);
+                        hostno, added[i].bus, added[i].target, added[i].lun);
                 /* now we have to remove it from ccissscsi, */
                 /* since it didn't get added to scsi mid layer */
-                fixup_botched_add(ctlr, added[i].scsi3addr);
+                fixup_botched_add(h, added[i].scsi3addr);
         }
 
 free_and_out:
@@ -675,33 +674,33 @@ free_and_out:
 }
 
 static int
-lookup_scsi3addr(int ctlr, int bus, int target, int lun, char *scsi3addr)
+lookup_scsi3addr(ctlr_info_t *h, int bus, int target, int lun, char *scsi3addr)
 {
         int i;
         struct cciss_scsi_dev_t *sd;
         unsigned long flags;
 
-        CPQ_TAPE_LOCK(ctlr, flags);
-        for (i=0;i<ccissscsi[ctlr].ndevices;i++) {
-                sd = &ccissscsi[ctlr].dev[i];
+        CPQ_TAPE_LOCK(h, flags);
+        for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
+                sd = &ccissscsi[h->ctlr].dev[i];
                 if (sd->bus == bus &&
                     sd->target == target &&
                     sd->lun == lun) {
                         memcpy(scsi3addr, &sd->scsi3addr[0], 8);
-                        CPQ_TAPE_UNLOCK(ctlr, flags);
+                        CPQ_TAPE_UNLOCK(h, flags);
                         return 0;
                 }
         }
-        CPQ_TAPE_UNLOCK(ctlr, flags);
+        CPQ_TAPE_UNLOCK(h, flags);
         return -1;
 }
 
 static void 
-cciss_scsi_setup(int cntl_num)
+cciss_scsi_setup(ctlr_info_t *h)
 {
         struct cciss_scsi_adapter_data_t * shba;
 
-        ccissscsi[cntl_num].ndevices = 0;
+        ccissscsi[h->ctlr].ndevices = 0;
         shba = (struct cciss_scsi_adapter_data_t *)
                 kmalloc(sizeof(*shba), GFP_KERNEL);     
         if (shba == NULL)
@@ -709,35 +708,35 @@ cciss_scsi_setup(int cntl_num)
         shba->scsi_host = NULL;
         spin_lock_init(&shba->lock);
         shba->registered = 0;
-        if (scsi_cmd_stack_setup(cntl_num, shba) != 0) {
+        if (scsi_cmd_stack_setup(h, shba) != 0) {
                 kfree(shba);
                 shba = NULL;
         }
-        hba[cntl_num]->scsi_ctlr = shba;
+        h->scsi_ctlr = shba;
         return;
 }
 
-static void
-complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
+static void complete_scsi_command(CommandList_struct *c, int timeout,
+        __u32 tag)
 {
         struct scsi_cmnd *cmd;
-        ctlr_info_t *ctlr;
+        ctlr_info_t *h;
         ErrorInfo_struct *ei;
 
-        ei = cp->err_info;
+        ei = c->err_info;
 
         /* First, see if it was a message rather than a command */
-        if (cp->Request.Type.Type == TYPE_MSG)  {
-                cp->cmd_type = CMD_MSG_DONE;
+        if (c->Request.Type.Type == TYPE_MSG)  {
+                c->cmd_type = CMD_MSG_DONE;
                 return;
         }
 
-        cmd = (struct scsi_cmnd *) cp->scsi_cmd;        
-        ctlr = hba[cp->ctlr];
+        cmd = (struct scsi_cmnd *) c->scsi_cmd;
+        h = hba[c->ctlr];
 
         scsi_dma_unmap(cmd);
-        if (cp->Header.SGTotal > ctlr->max_cmd_sgentries)
-                cciss_unmap_sg_chain_block(ctlr, cp);
+        if (c->Header.SGTotal > h->max_cmd_sgentries)
+                cciss_unmap_sg_chain_block(h, c);
 
         cmd->result = (DID_OK << 16);           /* host byte */
         cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
@@ -764,9 +763,8 @@ complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
                                 {
 #if 0
                                         printk(KERN_WARNING "cciss: cmd %p "
-                                        "has SCSI Status = %x\n",
-                                                cp,  
-                                                ei->ScsiStatus); 
+                                                "has SCSI Status = %x\n",
+                                                c, ei->ScsiStatus);
 #endif
                                         cmd->result |= (ei->ScsiStatus << 1);
                                 }
@@ -786,13 +784,13 @@ complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
                         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
                         break;
                         case CMD_DATA_OVERRUN:
-                                printk(KERN_WARNING "cciss: cp %p has"
+                                dev_warn(&h->pdev->dev, "%p has"
                                         " completed with data overrun "
-                                        "reported\n", cp);
+                                        "reported\n", c);
                         break;
                         case CMD_INVALID: {
-                                /* print_bytes(cp, sizeof(*cp), 1, 0);
-                                print_cmd(cp); */
+                                /* print_bytes(c, sizeof(*c), 1, 0);
+                                print_cmd(c); */
      /* We get CMD_INVALID if you address a non-existent tape drive instead
         of a selection timeout (no response).  You will see this if you yank 
         out a tape drive, then try to access it. This is kind of a shame
@@ -802,54 +800,50 @@ complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
                                 }
                         break;
                         case CMD_PROTOCOL_ERR:
-                                printk(KERN_WARNING "cciss: cp %p has "
-                                        "protocol error \n", cp);
+                                dev_warn(&h->pdev->dev,
+                                        "%p has protocol error\n", c);
                         break;
                         case CMD_HARDWARE_ERR:
                                 cmd->result = DID_ERROR << 16;
-                                printk(KERN_WARNING "cciss: cp %p had " 
-                                        " hardware error\n", cp);
+                                dev_warn(&h->pdev->dev,
+                                        "%p had hardware error\n", c);
                         break;
                         case CMD_CONNECTION_LOST:
                                 cmd->result = DID_ERROR << 16;
-                                printk(KERN_WARNING "cciss: cp %p had "
-                                        "connection lost\n", cp);
+                                dev_warn(&h->pdev->dev,
+                                        "%p had connection lost\n", c);
                         break;
                         case CMD_ABORTED:
                                 cmd->result = DID_ABORT << 16;
-                                printk(KERN_WARNING "cciss: cp %p was "
-                                        "aborted\n", cp);
+                                dev_warn(&h->pdev->dev, "%p was aborted\n", c);
                         break;
                         case CMD_ABORT_FAILED:
                                 cmd->result = DID_ERROR << 16;
-                                printk(KERN_WARNING "cciss: cp %p reports "
-                                        "abort failed\n", cp);
+                                dev_warn(&h->pdev->dev,
+                                        "%p reports abort failed\n", c);
                         break;
                         case CMD_UNSOLICITED_ABORT:
                                 cmd->result = DID_ABORT << 16;
-                                printk(KERN_WARNING "cciss: cp %p aborted "
-                                        "do to an unsolicited abort\n", cp);
+                                dev_warn(&h->pdev->dev, "%p aborted do to an "
+                                        "unsolicited abort\n", c);
                         break;
                         case CMD_TIMEOUT:
                                 cmd->result = DID_TIME_OUT << 16;
-                                printk(KERN_WARNING "cciss: cp %p timedout\n",
-                                        cp);
+                                dev_warn(&h->pdev->dev, "%p timedout\n", c);
                         break;
                         default:
                                 cmd->result = DID_ERROR << 16;
-                                printk(KERN_WARNING "cciss: cp %p returned "
-                                        "unknown status %x\n", cp, 
+                                dev_warn(&h->pdev->dev,
+                                        "%p returned unknown status %x\n", c,
                                                 ei->CommandStatus); 
                 }
         }
-        // printk("c:%p:c%db%dt%dl%d ", cmd, ctlr->ctlr, cmd->channel, 
-        //      cmd->target, cmd->lun);
         cmd->scsi_done(cmd);
-        scsi_cmd_free(ctlr, cp);
+        scsi_cmd_free(h, c);
 }
 
 static int
-cciss_scsi_detect(int ctlr)
+cciss_scsi_detect(ctlr_info_t *h)
 {
         struct Scsi_Host *sh;
         int error;
@@ -860,15 +854,15 @@ cciss_scsi_detect(int ctlr)
         sh->io_port = 0;        // good enough?  FIXME, 
         sh->n_io_port = 0;      // I don't think we use these two...
         sh->this_id = SELF_SCSI_ID;  
-        sh->sg_tablesize = hba[ctlr]->maxsgentries;
+        sh->sg_tablesize = h->maxsgentries;
         sh->max_cmd_len = MAX_COMMAND_SIZE;
 
         ((struct cciss_scsi_adapter_data_t *) 
-                hba[ctlr]->scsi_ctlr)->scsi_host = sh;
-        sh->hostdata[0] = (unsigned long) hba[ctlr];
-        sh->irq = hba[ctlr]->intr[SIMPLE_MODE_INT];
+                h->scsi_ctlr)->scsi_host = sh;
+        sh->hostdata[0] = (unsigned long) h;
+        sh->irq = h->intr[SIMPLE_MODE_INT];
         sh->unique_id = sh->irq;
-        error = scsi_add_host(sh, &hba[ctlr]->pdev->dev);
+        error = scsi_add_host(sh, &h->pdev->dev);
         if (error)
                 goto fail_host_put;
         scsi_scan_host(sh);
@@ -882,20 +876,20 @@ cciss_scsi_detect(int ctlr)
 
 static void
 cciss_unmap_one(struct pci_dev *pdev,
-                CommandList_struct *cp,
+                CommandList_struct *c,
                 size_t buflen,
                 int data_direction)
 {
         u64bit addr64;
 
-        addr64.val32.lower = cp->SG[0].Addr.lower;
-        addr64.val32.upper = cp->SG[0].Addr.upper;
+        addr64.val32.lower = c->SG[0].Addr.lower;
+        addr64.val32.upper = c->SG[0].Addr.upper;
         pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction);
 }
 
 static void
 cciss_map_one(struct pci_dev *pdev,
-                CommandList_struct *cp,
+                CommandList_struct *c,
                 unsigned char *buf,
                 size_t buflen,
                 int data_direction)
@@ -903,164 +897,149 @@ cciss_map_one(struct pci_dev *pdev,
         __u64 addr64;
 
         addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction);
-        cp->SG[0].Addr.lower = 
+        c->SG[0].Addr.lower =
           (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
-        cp->SG[0].Addr.upper =
+        c->SG[0].Addr.upper =
           (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
-        cp->SG[0].Len = buflen;
-        cp->Header.SGList = (__u8) 1;   /* no. SGs contig in this cmd */
-        cp->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
+        c->SG[0].Len = buflen;
+        c->Header.SGList = (__u8) 1;   /* no. SGs contig in this cmd */
+        c->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
 }
 
 static int
-cciss_scsi_do_simple_cmd(ctlr_info_t *c,
-                        CommandList_struct *cp,
+cciss_scsi_do_simple_cmd(ctlr_info_t *h,
+                        CommandList_struct *c,
                         unsigned char *scsi3addr, 
                         unsigned char *cdb,
                         unsigned char cdblen,
                         unsigned char *buf, int bufsize,
                         int direction)
 {
-        unsigned long flags;
         DECLARE_COMPLETION_ONSTACK(wait);
 
-        cp->cmd_type = CMD_IOCTL_PEND;          // treat this like an ioctl 
-        cp->scsi_cmd = NULL;
-        cp->Header.ReplyQueue = 0;  // unused in simple mode
-        memcpy(&cp->Header.LUN, scsi3addr, sizeof(cp->Header.LUN));
-        cp->Header.Tag.lower = cp->busaddr;  // Use k. address of cmd as tag
+        c->cmd_type = CMD_IOCTL_PEND; /* treat this like an ioctl */
+        c->scsi_cmd = NULL;
+        c->Header.ReplyQueue = 0;  /* unused in simple mode */
+        memcpy(&c->Header.LUN, scsi3addr, sizeof(c->Header.LUN));
+        c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
         // Fill in the request block...
 
         /* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n", 
                 scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
                 scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */
 
-        memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB));
-        memcpy(cp->Request.CDB, cdb, cdblen);
-        cp->Request.Timeout = 0;
-        cp->Request.CDBLen = cdblen;
-        cp->Request.Type.Type = TYPE_CMD;
-        cp->Request.Type.Attribute = ATTR_SIMPLE;
-        cp->Request.Type.Direction = direction;
+        memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
+        memcpy(c->Request.CDB, cdb, cdblen);
+        c->Request.Timeout = 0;
+        c->Request.CDBLen = cdblen;
+        c->Request.Type.Type = TYPE_CMD;
+        c->Request.Type.Attribute = ATTR_SIMPLE;
+        c->Request.Type.Direction = direction;
 
         /* Fill in the SG list and do dma mapping */
-        cciss_map_one(c->pdev, cp, (unsigned char *) buf,
+        cciss_map_one(h->pdev, c, (unsigned char *) buf,
                         bufsize, DMA_FROM_DEVICE); 
 
-        cp->waiting = &wait;
-
-        /* Put the request on the tail of the request queue */
-        spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
-        addQ(&c->reqQ, cp);
-        c->Qdepth++;
-        start_io(c);
-        spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
-
+        c->waiting = &wait;
+        enqueue_cmd_and_start_io(h, c);
         wait_for_completion(&wait);
 
         /* undo the dma mapping */
-        cciss_unmap_one(c->pdev, cp, bufsize, DMA_FROM_DEVICE);
+        cciss_unmap_one(h->pdev, c, bufsize, DMA_FROM_DEVICE);
         return(0);
 }
 
 static void 
-cciss_scsi_interpret_error(CommandList_struct *cp)
+cciss_scsi_interpret_error(ctlr_info_t *h, CommandList_struct *c)
 {
         ErrorInfo_struct *ei;
 
-        ei = cp->err_info; 
+        ei = c->err_info;
         switch(ei->CommandStatus)
         {
                 case CMD_TARGET_STATUS:
-                        printk(KERN_WARNING "cciss: cmd %p has "
-                                "completed with errors\n", cp);
-                        printk(KERN_WARNING "cciss: cmd %p "
-                                "has SCSI Status = %x\n",
-                                        cp,  
-                                        ei->ScsiStatus);
+                        dev_warn(&h->pdev->dev,
+                                "cmd %p has completed with errors\n", c);
+                        dev_warn(&h->pdev->dev,
+                                "cmd %p has SCSI Status = %x\n",
+                                c, ei->ScsiStatus);
                         if (ei->ScsiStatus == 0)
-                                printk(KERN_WARNING 
-                                "cciss:SCSI status is abnormally zero.  "
+                                dev_warn(&h->pdev->dev,
+                                "SCSI status is abnormally zero.  "
                                 "(probably indicates selection timeout "
                                 "reported incorrectly due to a known "
                                 "firmware bug, circa July, 2001.)\n");
                 break;
                 case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
-                        printk("UNDERRUN\n");
+                        dev_info(&h->pdev->dev, "UNDERRUN\n");
                 break;
                 case CMD_DATA_OVERRUN:
-                        printk(KERN_WARNING "cciss: cp %p has"
+                        dev_warn(&h->pdev->dev, "%p has"
                                 " completed with data overrun "
-                                "reported\n", cp);
+                                "reported\n", c);
                 break;
                 case CMD_INVALID: {
                         /* controller unfortunately reports SCSI passthru's */
                         /* to non-existent targets as invalid commands. */
-                        printk(KERN_WARNING "cciss: cp %p is "
-                                "reported invalid (probably means "
-                                "target device no longer present)\n", 
-                                cp); 
-                        /* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0);
-                        print_cmd(cp);  */
+                        dev_warn(&h->pdev->dev,
+                                "%p is reported invalid (probably means "
+                                "target device no longer present)\n", c);
+                        /* print_bytes((unsigned char *) c, sizeof(*c), 1, 0);
+                        print_cmd(c);  */
                         }
                 break;
                 case CMD_PROTOCOL_ERR:
-                        printk(KERN_WARNING "cciss: cp %p has "
-                                "protocol error \n", cp);
+                        dev_warn(&h->pdev->dev, "%p has protocol error\n", c);
                 break;
                 case CMD_HARDWARE_ERR:
                         /* cmd->result = DID_ERROR << 16; */
-                        printk(KERN_WARNING "cciss: cp %p had " 
-                                " hardware error\n", cp);
+                        dev_warn(&h->pdev->dev, "%p had hardware error\n", c);
                 break;
                 case CMD_CONNECTION_LOST:
-                        printk(KERN_WARNING "cciss: cp %p had "
-                                "connection lost\n", cp);
+                        dev_warn(&h->pdev->dev, "%p had connection lost\n", c);
                 break;
                 case CMD_ABORTED:
-                        printk(KERN_WARNING "cciss: cp %p was "
-                                "aborted\n", cp);
+                        dev_warn(&h->pdev->dev, "%p was aborted\n", c);
                 break;
                 case CMD_ABORT_FAILED:
-                        printk(KERN_WARNING "cciss: cp %p reports "
-                                "abort failed\n", cp);
+                        dev_warn(&h->pdev->dev,
+                                "%p reports abort failed\n", c);
                 break;
                 case CMD_UNSOLICITED_ABORT:
-                        printk(KERN_WARNING "cciss: cp %p aborted "
-                                "do to an unsolicited abort\n", cp);
+                        dev_warn(&h->pdev->dev,
+                                "%p aborted do to an unsolicited abort\n", c);
                 break;
                 case CMD_TIMEOUT:
-                        printk(KERN_WARNING "cciss: cp %p timedout\n",
-                                cp);
+                        dev_warn(&h->pdev->dev, "%p timedout\n", c);
                 break;
                 default:
-                        printk(KERN_WARNING "cciss: cp %p returned "
-                                "unknown status %x\n", cp, 
-                                        ei->CommandStatus); 
+                        dev_warn(&h->pdev->dev,
+                                "%p returned unknown status %x\n",
+                                c, ei->CommandStatus);
         }
 }
 
 static int
-cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr, 
+cciss_scsi_do_inquiry(ctlr_info_t *h, unsigned char *scsi3addr,
         unsigned char page, unsigned char *buf,
         unsigned char bufsize)
 {
         int rc;
-        CommandList_struct *cp;
+        CommandList_struct *c;
         char cdb[6];
         ErrorInfo_struct *ei;
         unsigned long flags;
 
-        spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
-        cp = scsi_cmd_alloc(c);
-        spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
+        c = scsi_cmd_alloc(h);
+        spin_unlock_irqrestore(&h->lock, flags);
 
-        if (cp == NULL) {                       /* trouble... */
+        if (c == NULL) {                        /* trouble... */
                 printk("cmd_alloc returned NULL!\n");
                 return -1;
         }
 
-        ei = cp->err_info; 
+        ei = c->err_info;
 
         cdb[0] = CISS_INQUIRY;
         cdb[1] = (page != 0);
@@ -1068,24 +1047,24 @@ cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
         cdb[3] = 0;
         cdb[4] = bufsize;
         cdb[5] = 0;
-        rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb, 
+        rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr, cdb,
                                 6, buf, bufsize, XFER_READ);
 
         if (rc != 0) return rc; /* something went wrong */
 
         if (ei->CommandStatus != 0 && 
             ei->CommandStatus != CMD_DATA_UNDERRUN) {
-                cciss_scsi_interpret_error(cp);
+                cciss_scsi_interpret_error(h, c);
                 rc = -1;
         }
-        spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
-        scsi_cmd_free(c, cp);
-        spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
+        scsi_cmd_free(h, c);
+        spin_unlock_irqrestore(&h->lock, flags);
         return rc;      
 }
 
 /* Get the device id from inquiry page 0x83 */
-static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr,
+static int cciss_scsi_get_device_id(ctlr_info_t *h, unsigned char *scsi3addr,
         unsigned char *device_id, int buflen)
 {
         int rc;
@@ -1096,7 +1075,7 @@ static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr,
         buf = kzalloc(64, GFP_KERNEL);
         if (!buf)
                 return -1;
-        rc = cciss_scsi_do_inquiry(c, scsi3addr, 0x83, buf, 64);
+        rc = cciss_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
         if (rc == 0)
                 memcpy(device_id, &buf[8], buflen);
         kfree(buf);
@@ -1104,20 +1083,20 @@ static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr,
 }
 
 static int
-cciss_scsi_do_report_phys_luns(ctlr_info_t *c, 
+cciss_scsi_do_report_phys_luns(ctlr_info_t *h,
                 ReportLunData_struct *buf, int bufsize)
 {
         int rc;
-        CommandList_struct *cp;
+        CommandList_struct *c;
         unsigned char cdb[12];
         unsigned char scsi3addr[8]; 
         ErrorInfo_struct *ei;
         unsigned long flags;
 
-        spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
-        cp = scsi_cmd_alloc(c);
-        spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
-        if (cp == NULL) {                       /* trouble... */
+        spin_lock_irqsave(&h->lock, flags);
+        c = scsi_cmd_alloc(h);
+        spin_unlock_irqrestore(&h->lock, flags);
+        if (c == NULL) {                        /* trouble... */
                 printk("cmd_alloc returned NULL!\n");
                 return -1;
         }
@@ -1136,27 +1115,27 @@ cciss_scsi_do_report_phys_luns(ctlr_info_t *c,
         cdb[10] = 0;
         cdb[11] = 0;
 
-        rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, 
+        rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr,
                                 cdb, 12, 
                                 (unsigned char *) buf, 
                                 bufsize, XFER_READ);
 
         if (rc != 0) return rc; /* something went wrong */
 
-        ei = cp->err_info; 
+        ei = c->err_info;
         if (ei->CommandStatus != 0 && 
             ei->CommandStatus != CMD_DATA_UNDERRUN) {
-                cciss_scsi_interpret_error(cp);
+                cciss_scsi_interpret_error(h, c);
                 rc = -1;
         }
-        spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
-        scsi_cmd_free(c, cp);
-        spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
+        spin_lock_irqsave(&h->lock, flags);
+        scsi_cmd_free(h, c);
+        spin_unlock_irqrestore(&h->lock, flags);
         return rc;      
 }
 
 static void
-cciss_update_non_disk_devices(int cntl_num, int hostno)
+cciss_update_non_disk_devices(ctlr_info_t *h, int hostno)
 {
         /* the idea here is we could get notified from /proc
            that some devices have changed, so we do a report 
@@ -1189,7 +1168,6 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
         ReportLunData_struct *ld_buff;
         unsigned char *inq_buff;
         unsigned char scsi3addr[8];
-        ctlr_info_t *c;
         __u32 num_luns=0;
         unsigned char *ch;
         struct cciss_scsi_dev_t *currentsd, *this_device;
@@ -1197,7 +1175,6 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
         int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
         int i;
 
-        c = (ctlr_info_t *) hba[cntl_num];      
         ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
         inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
         currentsd = kzalloc(sizeof(*currentsd) *
@@ -1207,7 +1184,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
                 goto out;
         }
         this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
-        if (cciss_scsi_do_report_phys_luns(c, ld_buff, reportlunsize) == 0) {
+        if (cciss_scsi_do_report_phys_luns(h, ld_buff, reportlunsize) == 0) {
                 ch = &ld_buff->LUNListLength[0];
                 num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
                 if (num_luns > CISS_MAX_PHYS_LUN) {
@@ -1231,7 +1208,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
                 memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
                 memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
 
-                if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, 0, inq_buff,
+                if (cciss_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
                         (unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
                         /* Inquiry failed (msg printed already) */
                         continue; /* so we will skip this device. */
@@ -1249,7 +1226,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
                         sizeof(this_device->revision));
                 memset(this_device->device_id, 0,
                         sizeof(this_device->device_id));
-                cciss_scsi_get_device_id(hba[cntl_num], scsi3addr,
+                cciss_scsi_get_device_id(h, scsi3addr,
                         this_device->device_id, sizeof(this_device->device_id));
 
                 switch (this_device->devtype)
@@ -1276,7 +1253,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
                   case 0x08: /* medium changer */
                         if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
                                 printk(KERN_INFO "cciss%d: %s ignored, "
-                                        "too many devices.\n", cntl_num,
+                                        "too many devices.\n", h->ctlr,
                                         scsi_device_type(this_device->devtype));
                                 break;
                         }
@@ -1288,7 +1265,7 @@ cciss_update_non_disk_devices(int cntl_num, int hostno)
                 }
         }
 
-        adjust_cciss_scsi_table(cntl_num, hostno, currentsd, ncurrent);
+        adjust_cciss_scsi_table(h, hostno, currentsd, ncurrent);
 out:
         kfree(inq_buff);
         kfree(ld_buff);
@@ -1307,12 +1284,12 @@ is_keyword(char *ptr, int len, char *verb)  // Thanks to ncr53c8xx.c
 }
 
 static int
-cciss_scsi_user_command(int ctlr, int hostno, char *buffer, int length)
+cciss_scsi_user_command(ctlr_info_t *h, int hostno, char *buffer, int length)
 {
         int arg_len;
 
         if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
-                cciss_update_non_disk_devices(ctlr, hostno);
+                cciss_update_non_disk_devices(h, hostno);
         else
                 return -EINVAL;
         return length;
@@ -1329,20 +1306,16 @@ cciss_scsi_proc_info(struct Scsi_Host *sh,
 {
 
         int buflen, datalen;
-        ctlr_info_t *ci;
+        ctlr_info_t *h;
         int i;
-        int cntl_num;
-
 
-        ci = (ctlr_info_t *) sh->hostdata[0];
-        if (ci == NULL)  /* This really shouldn't ever happen. */
+        h = (ctlr_info_t *) sh->hostdata[0];
+        if (h == NULL)  /* This really shouldn't ever happen. */
                 return -EINVAL;
 
-        cntl_num = ci->ctlr;    /* Get our index into the hba[] array */
-
         if (func == 0) {        /* User is reading from /proc/scsi/ciss*?/?*  */
                 buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
-                                cntl_num, sh->host_no);
+                                h->ctlr, sh->host_no);
 
                 /* this information is needed by apps to know which cciss
                    device corresponds to which scsi host number without
@@ -1352,8 +1325,9 @@ cciss_scsi_proc_info(struct Scsi_Host *sh,
                    this info is for an app to be able to use to know how to
                    get them back in sync. */
 
-                for (i=0;i<ccissscsi[cntl_num].ndevices;i++) {
-                        struct cciss_scsi_dev_t *sd = &ccissscsi[cntl_num].dev[i];
+                for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
+                        struct cciss_scsi_dev_t *sd =
+                                &ccissscsi[h->ctlr].dev[i];
                         buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d "
                                 "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
                                 sh->host_no, sd->bus, sd->target, sd->lun,
@@ -1371,15 +1345,15 @@ cciss_scsi_proc_info(struct Scsi_Host *sh,
                         *start = buffer + offset;
                 return(datalen);
         } else  /* User is writing to /proc/scsi/cciss*?/?*  ... */
-                return cciss_scsi_user_command(cntl_num, sh->host_no,
+                return cciss_scsi_user_command(h, sh->host_no,
                         buffer, length);        
 } 
 
 /* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci 
    dma mapping  and fills in the scatter gather entries of the 
-   cciss command, cp. */
+   cciss command, c. */
 
-static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *cp,
+static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *c,
         struct scsi_cmnd *cmd)
 {
         unsigned int len;
@@ -1393,7 +1367,7 @@ static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *cp,
 
         chained = 0;
         sg_index = 0;
-        curr_sg = cp->SG;
+        curr_sg = c->SG;
         request_nsgs = scsi_dma_map(cmd);
         if (request_nsgs) {
                 scsi_for_each_sg(cmd, sg, request_nsgs, i) {
@@ -1401,7 +1375,7 @@ static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *cp,
                                 !chained && request_nsgs - i > 1) {
                                 chained = 1;
                                 sg_index = 0;
-                                curr_sg = sa->cmd_sg_list[cp->cmdindex];
+                                curr_sg = sa->cmd_sg_list[c->cmdindex];
                         }
                         addr64 = (__u64) sg_dma_address(sg);
                         len  = sg_dma_len(sg);
@@ -1414,19 +1388,19 @@ static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *cp,
                         ++sg_index;
                 }
                 if (chained)
-                        cciss_map_sg_chain_block(h, cp,
-                                sa->cmd_sg_list[cp->cmdindex],
+                        cciss_map_sg_chain_block(h, c,
+                                sa->cmd_sg_list[c->cmdindex],
                                 (request_nsgs - (h->max_cmd_sgentries - 1)) *
                                         sizeof(SGDescriptor_struct));
         }
         /* track how many SG entries we are using */
         if (request_nsgs > h->maxSG)
                 h->maxSG = request_nsgs;
-        cp->Header.SGTotal = (__u8) request_nsgs + chained;
+        c->Header.SGTotal = (__u8) request_nsgs + chained;
         if (request_nsgs > h->max_cmd_sgentries)
-                cp->Header.SGList = h->max_cmd_sgentries;
+                c->Header.SGList = h->max_cmd_sgentries;
         else
-                cp->Header.SGList = cp->Header.SGTotal;
+                c->Header.SGList = c->Header.SGTotal;
         return;
 }
 
@@ -1434,18 +1408,17 @@ static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *cp,
 static int
 cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
 {
-        ctlr_info_t *c;
-        int ctlr, rc;
+        ctlr_info_t *h;
+        int rc;
         unsigned char scsi3addr[8];
-        CommandList_struct *cp;
+        CommandList_struct *c;
         unsigned long flags;
 
         // Get the ptr to our adapter structure (hba[i]) out of cmd->host.
         // We violate cmd->host privacy here.  (Is there another way?)
-        c = (ctlr_info_t *) cmd->device->host->hostdata[0];
-        ctlr = c->ctlr;
+        h = (ctlr_info_t *) cmd->device->host->hostdata[0];
 
-        rc = lookup_scsi3addr(ctlr, cmd->device->channel, cmd->device->id, 
+        rc = lookup_scsi3addr(h, cmd->device->channel, cmd->device->id,
                         cmd->device->lun, scsi3addr);
         if (rc != 0) {
                 /* the scsi nexus does not match any that we presented... */
@@ -1457,19 +1430,14 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
                 return 0;
         }
 
-        /* printk("cciss_queue_command, p=%p, cmd=0x%02x, c%db%dt%dl%d\n", 
-                cmd, cmd->cmnd[0], ctlr, cmd->channel, cmd->target, cmd->lun);*/
-        // printk("q:%p:c%db%dt%dl%d ", cmd, ctlr, cmd->channel, 
-        //      cmd->target, cmd->lun);
-
         /* Ok, we have a reasonable scsi nexus, so send the cmd down, and
            see what the device thinks of it. */
 
-        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-        cp = scsi_cmd_alloc(c);
-        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-        if (cp == NULL) {                       /* trouble... */
-                printk("scsi_cmd_alloc returned NULL!\n");
+        spin_lock_irqsave(&h->lock, flags);
+        c = scsi_cmd_alloc(h);
+        spin_unlock_irqrestore(&h->lock, flags);
+        if (c == NULL) {                        /* trouble... */
+                dev_warn(&h->pdev->dev, "scsi_cmd_alloc returned NULL!\n");
                 /* FIXME: next 3 lines are -> BAD! <- */
                 cmd->result = DID_NO_CONNECT << 16;
                 done(cmd);
@@ -1480,35 +1448,41 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
 
         cmd->scsi_done = done;    // save this for use by completion code 
 
-        // save cp in case we have to abort it 
-        cmd->host_scribble = (unsigned char *) cp; 
+        /* save c in case we have to abort it */
+        cmd->host_scribble = (unsigned char *) c;
 
-        cp->cmd_type = CMD_SCSI;
-        cp->scsi_cmd = cmd;
-        cp->Header.ReplyQueue = 0;  // unused in simple mode
-        memcpy(&cp->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
-        cp->Header.Tag.lower = cp->busaddr;  // Use k. address of cmd as tag
+        c->cmd_type = CMD_SCSI;
+        c->scsi_cmd = cmd;
+        c->Header.ReplyQueue = 0;  /* unused in simple mode */
+        memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
+        c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
         
         // Fill in the request block...
 
-        cp->Request.Timeout = 0;
-        memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB));
-        BUG_ON(cmd->cmd_len > sizeof(cp->Request.CDB));
-        cp->Request.CDBLen = cmd->cmd_len;
-        memcpy(cp->Request.CDB, cmd->cmnd, cmd->cmd_len);
-        cp->Request.Type.Type = TYPE_CMD;
-        cp->Request.Type.Attribute = ATTR_SIMPLE;
+        c->Request.Timeout = 0;
+        memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
+        BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
+        c->Request.CDBLen = cmd->cmd_len;
+        memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
+        c->Request.Type.Type = TYPE_CMD;
+        c->Request.Type.Attribute = ATTR_SIMPLE;
         switch(cmd->sc_data_direction)
         {
-          case DMA_TO_DEVICE: cp->Request.Type.Direction = XFER_WRITE; break;
-          case DMA_FROM_DEVICE: cp->Request.Type.Direction = XFER_READ; break;
-          case DMA_NONE: cp->Request.Type.Direction = XFER_NONE; break;
+          case DMA_TO_DEVICE:
+                c->Request.Type.Direction = XFER_WRITE;
+                break;
+          case DMA_FROM_DEVICE:
+                c->Request.Type.Direction = XFER_READ;
+                break;
+          case DMA_NONE:
+                c->Request.Type.Direction = XFER_NONE;
+                break;
           case DMA_BIDIRECTIONAL:
                 // This can happen if a buggy application does a scsi passthru
                 // and sets both inlen and outlen to non-zero. ( see
                 // ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
 
-                cp->Request.Type.Direction = XFER_RSVD;
+                c->Request.Type.Direction = XFER_RSVD;
                 // This is technically wrong, and cciss controllers should
                 // reject it with CMD_INVALID, which is the most correct 
                 // response, but non-fibre backends appear to let it 
@@ -1519,27 +1493,18 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
                 break;
 
           default: 
-                printk("cciss: unknown data direction: %d\n", 
+                dev_warn(&h->pdev->dev, "unknown data direction: %d\n",
                         cmd->sc_data_direction);
                 BUG();
                 break;
         }
-        cciss_scatter_gather(c, cp, cmd);
-
-        /* Put the request on the tail of the request queue */
-
-        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-        addQ(&c->reqQ, cp);
-        c->Qdepth++;
-        start_io(c);
-        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-
+        cciss_scatter_gather(h, c, cmd);
+        enqueue_cmd_and_start_io(h, c);
         /* the cmd'll come back via intr handler in complete_scsi_command()  */
         return 0;
 }
 
-static void 
-cciss_unregister_scsi(int ctlr)
+static void cciss_unregister_scsi(ctlr_info_t *h)
 {
         struct cciss_scsi_adapter_data_t *sa;
         struct cciss_scsi_cmd_stack_t *stk;
@@ -1547,59 +1512,58 @@ cciss_unregister_scsi(int ctlr)
 
         /* we are being forcibly unloaded, and may not refuse. */
 
-        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-        sa = hba[ctlr]->scsi_ctlr;
+        spin_lock_irqsave(&h->lock, flags);
+        sa = h->scsi_ctlr;
         stk = &sa->cmd_stack; 
 
         /* if we weren't ever actually registered, don't unregister */ 
         if (sa->registered) {
-                spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+                spin_unlock_irqrestore(&h->lock, flags);
                 scsi_remove_host(sa->scsi_host);
                 scsi_host_put(sa->scsi_host);
-                spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
+                spin_lock_irqsave(&h->lock, flags);
         }
 
         /* set scsi_host to NULL so our detect routine will 
            find us on register */
         sa->scsi_host = NULL;
-        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-        scsi_cmd_stack_free(ctlr);
+        spin_unlock_irqrestore(&h->lock, flags);
+        scsi_cmd_stack_free(h);
         kfree(sa);
 }
 
-static int 
-cciss_engage_scsi(int ctlr)
+static int cciss_engage_scsi(ctlr_info_t *h)
 {
         struct cciss_scsi_adapter_data_t *sa;
         struct cciss_scsi_cmd_stack_t *stk;
         unsigned long flags;
 
-        spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-        sa = hba[ctlr]->scsi_ctlr;
+        spin_lock_irqsave(&h->lock, flags);
+        sa = h->scsi_ctlr;
         stk = &sa->cmd_stack; 
 
         if (sa->registered) {
-                printk("cciss%d: SCSI subsystem already engaged.\n", ctlr);
-                spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+                dev_info(&h->pdev->dev, "SCSI subsystem already engaged.\n");
+                spin_unlock_irqrestore(&h->lock, flags);
                 return -ENXIO;
         }
         sa->registered = 1;
-        spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-        cciss_update_non_disk_devices(ctlr, -1);
-        cciss_scsi_detect(ctlr);
+        spin_unlock_irqrestore(&h->lock, flags);
+        cciss_update_non_disk_devices(h, -1);
+        cciss_scsi_detect(h);
         return 0;
 }
 
 static void
-cciss_seq_tape_report(struct seq_file *seq, int ctlr)
+cciss_seq_tape_report(struct seq_file *seq, ctlr_info_t *h)
 {
         unsigned long flags;
 
-        CPQ_TAPE_LOCK(ctlr, flags);
+        CPQ_TAPE_LOCK(h, flags);
         seq_printf(seq,
                 "Sequential access devices: %d\n\n",
-                        ccissscsi[ctlr].ndevices);
-        CPQ_TAPE_UNLOCK(ctlr, flags);
+                        ccissscsi[h->ctlr].ndevices);
+        CPQ_TAPE_UNLOCK(h, flags);
 }
 
 static int wait_for_device_to_become_ready(ctlr_info_t *h,
@@ -1610,10 +1574,10 @@ static int wait_for_device_to_become_ready(ctlr_info_t *h,
         int waittime = HZ;
         CommandList_struct *c;
 
-        c = cmd_alloc(h, 1);
+        c = cmd_alloc(h);
         if (!c) {
-                printk(KERN_WARNING "cciss%d: out of memory in "
-                        "wait_for_device_to_become_ready.\n", h->ctlr);
+                dev_warn(&h->pdev->dev, "out of memory in "
+                        "wait_for_device_to_become_ready.\n");
                 return IO_ERROR;
         }
 
@@ -1631,7 +1595,7 @@ static int wait_for_device_to_become_ready(ctlr_info_t *h,
                         waittime = waittime * 2;
 
                 /* Send the Test Unit Ready */
-                rc = fill_cmd(c, TEST_UNIT_READY, h->ctlr, NULL, 0, 0,
+                rc = fill_cmd(h, c, TEST_UNIT_READY, NULL, 0, 0,
                         lunaddr, TYPE_CMD);
                 if (rc == 0)
                         rc = sendcmd_withirq_core(h, c, 0);
@@ -1657,18 +1621,18 @@ static int wait_for_device_to_become_ready(ctlr_info_t *h,
                         }
                 }
 retry_tur:
-                printk(KERN_WARNING "cciss%d: Waiting %d secs "
+                dev_warn(&h->pdev->dev, "Waiting %d secs "
                         "for device to become ready.\n",
-                        h->ctlr, waittime / HZ);
+                        waittime / HZ);
                 rc = 1; /* device not ready. */
         }
 
         if (rc)
-                printk("cciss%d: giving up on device.\n", h->ctlr);
+                dev_warn(&h->pdev->dev, "giving up on device.\n");
         else
-                printk(KERN_WARNING "cciss%d: device is ready.\n", h->ctlr);
+                dev_warn(&h->pdev->dev, "device is ready.\n");
 
-        cmd_free(h, c, 1);
+        cmd_free(h, c);
         return rc;
 }
 
@@ -1688,26 +1652,24 @@ static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
         int rc;
         CommandList_struct *cmd_in_trouble;
         unsigned char lunaddr[8];
-        ctlr_info_t *c;
-        int ctlr;
+        ctlr_info_t *h;
 
         /* find the controller to which the command to be aborted was sent */
-        c = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
-        if (c == NULL) /* paranoia */
+        h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
+        if (h == NULL) /* paranoia */
                 return FAILED;
-        ctlr = c->ctlr;
-        printk(KERN_WARNING "cciss%d: resetting tape drive or medium changer.\n", ctlr);
+        dev_warn(&h->pdev->dev, "resetting tape drive or medium changer.\n");
         /* find the command that's giving us trouble */
         cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
         if (cmd_in_trouble == NULL) /* paranoia */
                 return FAILED;
         memcpy(lunaddr, &cmd_in_trouble->Header.LUN.LunAddrBytes[0], 8);
         /* send a reset to the SCSI LUN which the command was sent to */
-        rc = sendcmd_withirq(CCISS_RESET_MSG, ctlr, NULL, 0, 0, lunaddr,
+        rc = sendcmd_withirq(h, CCISS_RESET_MSG, NULL, 0, 0, lunaddr,
                 TYPE_MSG);
-        if (rc == 0 && wait_for_device_to_become_ready(c, lunaddr) == 0)
+        if (rc == 0 && wait_for_device_to_become_ready(h, lunaddr) == 0)
                 return SUCCESS;
-        printk(KERN_WARNING "cciss%d: resetting device failed.\n", ctlr);
+        dev_warn(&h->pdev->dev, "resetting device failed.\n");
         return FAILED;
 }
 
@@ -1716,22 +1678,20 @@ static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
         int rc;
         CommandList_struct *cmd_to_abort;
         unsigned char lunaddr[8];
-        ctlr_info_t *c;
-        int ctlr;
+        ctlr_info_t *h;
 
         /* find the controller to which the command to be aborted was sent */
-        c = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
-        if (c == NULL) /* paranoia */
+        h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
+        if (h == NULL) /* paranoia */
                 return FAILED;
-        ctlr = c->ctlr;
-        printk(KERN_WARNING "cciss%d: aborting tardy SCSI cmd\n", ctlr);
+        dev_warn(&h->pdev->dev, "aborting tardy SCSI cmd\n");
 
         /* find the command to be aborted */
         cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
         if (cmd_to_abort == NULL) /* paranoia */
                 return FAILED;
         memcpy(lunaddr, &cmd_to_abort->Header.LUN.LunAddrBytes[0], 8);
-        rc = sendcmd_withirq(CCISS_ABORT_MSG, ctlr, &cmd_to_abort->Header.Tag,
+        rc = sendcmd_withirq(h, CCISS_ABORT_MSG, &cmd_to_abort->Header.Tag,
                 0, 0, lunaddr, TYPE_MSG);
         if (rc == 0)
                 return SUCCESS;
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index abb4ec6690fc..d53b0291c44b 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -35,6 +35,7 @@
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/hdreg.h>
+#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/genhd.h>
@@ -157,7 +158,7 @@ static int sendcmd(
         unsigned int blkcnt,
         unsigned int log_unit );
 
-static int ida_open(struct block_device *bdev, fmode_t mode);
+static int ida_unlocked_open(struct block_device *bdev, fmode_t mode);
 static int ida_release(struct gendisk *disk, fmode_t mode);
 static int ida_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg);
 static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo);
@@ -195,9 +196,9 @@ static inline ctlr_info_t *get_host(struct gendisk *disk)
 
 static const struct block_device_operations ida_fops  = {
         .owner          = THIS_MODULE,
-        .open           = ida_open,
+        .open           = ida_unlocked_open,
         .release        = ida_release,
-        .locked_ioctl   = ida_ioctl,
+        .ioctl          = ida_ioctl,
         .getgeo         = ida_getgeo,
         .revalidate_disk= ida_revalidate,
 };
@@ -840,13 +841,29 @@ static int ida_open(struct block_device *bdev, fmode_t mode)
         return 0;
 }
 
+static int ida_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = ida_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
 /*
  * Close.  Sync first.
  */
 static int ida_release(struct gendisk *disk, fmode_t mode)
 {
-        ctlr_info_t *host = get_host(disk);
+        ctlr_info_t *host;
+
+        lock_kernel();
+        host = get_host(disk);
         host->usage_count--;
+        unlock_kernel();
+
         return 0;
 }
 
@@ -1128,7 +1145,7 @@ static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo)
  *  ida_ioctl does some miscellaneous stuff like reporting drive geometry,
  *  setting readahead and submitting commands from userspace to the controller.
  */
-static int ida_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
+static int ida_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
 {
         drv_info_t *drv = get_drv(bdev->bd_disk);
         ctlr_info_t *host = get_host(bdev->bd_disk);
@@ -1162,7 +1179,8 @@ out_passthru:
                 return error;
         case IDAGETCTLRSIG:
                 if (!arg) return -EINVAL;
-                put_user(host->ctlr_sig, (int __user *)arg);
+                if (put_user(host->ctlr_sig, (int __user *)arg))
+                        return -EFAULT;
                 return 0;
         case IDAREVALIDATEVOLS:
                 if (MINOR(bdev->bd_dev) != 0)
@@ -1170,7 +1188,8 @@ out_passthru:
                 return revalidate_allvol(host);
         case IDADRIVERVERSION:
                 if (!arg) return -EINVAL;
-                put_user(DRIVER_VERSION, (unsigned long __user *)arg);
+                if (put_user(DRIVER_VERSION, (unsigned long __user *)arg))
+                        return -EFAULT;
                 return 0;
         case IDAGETPCIINFO:
         {
@@ -1192,6 +1211,19 @@ out_passthru:
         }
                 
 }
+
+static int ida_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long param)
+{
+        int ret;
+
+        lock_kernel();
+        ret = ida_locked_ioctl(bdev, mode, cmd, param);
+        unlock_kernel();
+
+        return ret;
+}
+
 /*
  * ida_ctlr_ioctl is for passing commands to the controller from userspace.
  * The command block (io) has already been copied to kernel space for us,
@@ -1225,17 +1257,11 @@ static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io)
         /* Pre submit processing */
         switch(io->cmd) {
         case PASSTHRU_A:
-                p = kmalloc(io->sg[0].size, GFP_KERNEL);
-                if (!p) 
-                { 
-                        error = -ENOMEM; 
-                        cmd_free(h, c, 0); 
-                        return(error);
-                }
-                if (copy_from_user(p, io->sg[0].addr, io->sg[0].size)) {
-                        kfree(p);
-                        cmd_free(h, c, 0); 
-                        return -EFAULT;
+                p = memdup_user(io->sg[0].addr, io->sg[0].size);
+                if (IS_ERR(p)) {
+                        error = PTR_ERR(p);
+                        cmd_free(h, c, 0);
+                        return error;
                 }
                 c->req.hdr.blk = pci_map_single(h->pci_dev, &(io->c), 
                                 sizeof(ida_ioctl_t), 
@@ -1266,18 +1292,12 @@ static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io)
         case DIAG_PASS_THRU:
         case COLLECT_BUFFER:
         case WRITE_FLASH_ROM:
-                p = kmalloc(io->sg[0].size, GFP_KERNEL);
-                if (!p) 
-                { 
-                        error = -ENOMEM; 
-                        cmd_free(h, c, 0);
-                        return(error);
+                p = memdup_user(io->sg[0].addr, io->sg[0].size);
+                if (IS_ERR(p)) {
+                        error = PTR_ERR(p);
+                        cmd_free(h, c, 0);
+                        return error;
                 }
-                if (copy_from_user(p, io->sg[0].addr, io->sg[0].size)) {
-                        kfree(p);
-                        cmd_free(h, c, 0);
-                        return -EFAULT;
-                }
                 c->req.sg[0].size = io->sg[0].size;
                 c->req.sg[0].addr = pci_map_single(h->pci_dev, p, 
                         c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL); 
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index df018990c422..9400845d602e 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -79,8 +79,8 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
         md_io.error = 0;
 
         if ((rw & WRITE) && !test_bit(MD_NO_BARRIER, &mdev->flags))
-                rw |= (1 << BIO_RW_BARRIER);
-        rw |= ((1<<BIO_RW_UNPLUG) | (1<<BIO_RW_SYNCIO));
+                rw |= REQ_HARDBARRIER;
+        rw |= REQ_UNPLUG | REQ_SYNC;
 
  retry:
         bio = bio_alloc(GFP_NOIO, 1);
@@ -103,11 +103,11 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
         /* check for unsupported barrier op.
          * would rather check on EOPNOTSUPP, but that is not reliable.
          * don't try again for ANY return value != 0 */
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER) && !ok)) {
+        if (unlikely((bio->bi_rw & REQ_HARDBARRIER) && !ok)) {
                 /* Try again with no barrier */
                 dev_warn(DEV, "Barriers not supported on meta data device - disabling\n");
                 set_bit(MD_NO_BARRIER, &mdev->flags);
-                rw &= ~(1 << BIO_RW_BARRIER);
+                rw &= ~REQ_HARDBARRIER;
                 bio_put(bio);
                 goto retry;
         }
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 485ed8c7d623..352441b0f92f 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -550,12 +550,6 @@ struct p_delay_probe {
         u32     offset;  /* usecs the probe got sent after the reference time point */
 } __packed;
 
-struct delay_probe {
-        struct list_head list;
-        unsigned int seq_num;
-        struct timeval time;
-};
-
 /* DCBP: Drbd Compressed Bitmap Packet ... */
 static inline enum drbd_bitmap_code
 DCBP_get_code(struct p_compressed_bm *p)
@@ -942,11 +936,9 @@ struct drbd_conf {
         unsigned int ko_count;
         struct drbd_work  resync_work,
                           unplug_work,
-                          md_sync_work,
-                          delay_probe_work;
+                          md_sync_work;
         struct timer_list resync_timer;
         struct timer_list md_sync_timer;
-        struct timer_list delay_probe_timer;
 
         /* Used after attach while negotiating new disk state. */
         union drbd_state new_state_tmp;
@@ -1062,12 +1054,6 @@ struct drbd_conf {
         u64 ed_uuid; /* UUID of the exposed data */
         struct mutex state_mutex;
         char congestion_reason;  /* Why we where congested... */
-        struct list_head delay_probes; /* protected by peer_seq_lock */
-        int data_delay;   /* Delay of packets on the data-sock behind meta-sock */
-        unsigned int delay_seq; /* To generate sequence numbers of delay probes */
-        struct timeval dps_time; /* delay-probes-start-time */
-        unsigned int dp_volume_last;  /* send_cnt of last delay probe */
-        int c_sync_rate; /* current resync rate after delay_probe magic */
 };
 
 static inline struct drbd_conf *minor_to_mdev(unsigned int minor)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 7258c95e895e..fa650dd85b90 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2184,43 +2184,6 @@ int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
         return ok;
 }
 
-static int drbd_send_delay_probe(struct drbd_conf *mdev, struct drbd_socket *ds)
-{
-        struct p_delay_probe dp;
-        int offset, ok = 0;
-        struct timeval now;
-
-        mutex_lock(&ds->mutex);
-        if (likely(ds->socket)) {
-                do_gettimeofday(&now);
-                offset = now.tv_usec - mdev->dps_time.tv_usec +
-                         (now.tv_sec - mdev->dps_time.tv_sec) * 1000000;
-                dp.seq_num  = cpu_to_be32(mdev->delay_seq);
-                dp.offset   = cpu_to_be32(offset);
-
-                ok = _drbd_send_cmd(mdev, ds->socket, P_DELAY_PROBE,
-                                    (struct p_header *)&dp, sizeof(dp), 0);
-        }
-        mutex_unlock(&ds->mutex);
-
-        return ok;
-}
-
-static int drbd_send_delay_probes(struct drbd_conf *mdev)
-{
-        int ok;
-
-        mdev->delay_seq++;
-        do_gettimeofday(&mdev->dps_time);
-        ok = drbd_send_delay_probe(mdev, &mdev->meta);
-        ok = ok && drbd_send_delay_probe(mdev, &mdev->data);
-
-        mdev->dp_volume_last = mdev->send_cnt;
-        mod_timer(&mdev->delay_probe_timer, jiffies + mdev->sync_conf.dp_interval * HZ / 10);
-
-        return ok;
-}
-
 /* called on sndtimeo
  * returns FALSE if we should retry,
  * TRUE if we think connection is dead
@@ -2369,31 +2332,6 @@ static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
         return 1;
 }
 
-static void consider_delay_probes(struct drbd_conf *mdev)
-{
-        if (mdev->state.conn != C_SYNC_SOURCE || mdev->agreed_pro_version < 93)
-                return;
-
-        if (mdev->dp_volume_last + mdev->sync_conf.dp_volume * 2 < mdev->send_cnt)
-                drbd_send_delay_probes(mdev);
-}
-
-static int w_delay_probes(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
-{
-        if (!cancel && mdev->state.conn == C_SYNC_SOURCE)
-                drbd_send_delay_probes(mdev);
-
-        return 1;
-}
-
-static void delay_probe_timer_fn(unsigned long data)
-{
-        struct drbd_conf *mdev = (struct drbd_conf *) data;
-
-        if (list_empty(&mdev->delay_probe_work.list))
-                drbd_queue_work(&mdev->data.work, &mdev->delay_probe_work);
-}
-
 /* Used to send write requests
  * R_PRIMARY -> Peer    (P_DATA)
  */
@@ -2425,15 +2363,15 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
         /* NOTE: no need to check if barriers supported here as we would
          *       not pass the test in make_request_common in that case
          */
-        if (bio_rw_flagged(req->master_bio, BIO_RW_BARRIER)) {
+        if (req->master_bio->bi_rw & REQ_HARDBARRIER) {
                 dev_err(DEV, "ASSERT FAILED would have set DP_HARDBARRIER\n");
                 /* dp_flags |= DP_HARDBARRIER; */
         }
-        if (bio_rw_flagged(req->master_bio, BIO_RW_SYNCIO))
+        if (req->master_bio->bi_rw & REQ_SYNC)
                 dp_flags |= DP_RW_SYNC;
         /* for now handle SYNCIO and UNPLUG
          * as if they still were one and the same flag */
-        if (bio_rw_flagged(req->master_bio, BIO_RW_UNPLUG))
+        if (req->master_bio->bi_rw & REQ_UNPLUG)
                 dp_flags |= DP_RW_SYNC;
         if (mdev->state.conn >= C_SYNC_SOURCE &&
             mdev->state.conn <= C_PAUSED_SYNC_T)
@@ -2457,9 +2395,6 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
 
         drbd_put_data_sock(mdev);
 
-        if (ok)
-                consider_delay_probes(mdev);
-
         return ok;
 }
 
@@ -2506,9 +2441,6 @@ int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
 
         drbd_put_data_sock(mdev);
 
-        if (ok)
-                consider_delay_probes(mdev);
-
         return ok;
 }
 
@@ -2604,6 +2536,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
         unsigned long flags;
         int rv = 0;
 
+        lock_kernel();
         spin_lock_irqsave(&mdev->req_lock, flags);
         /* to have a stable mdev->state.role
          * and no race with updating open_cnt */
@@ -2618,6 +2551,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
         if (!rv)
                 mdev->open_cnt++;
         spin_unlock_irqrestore(&mdev->req_lock, flags);
+        unlock_kernel();
 
         return rv;
 }
@@ -2625,7 +2559,9 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 static int drbd_release(struct gendisk *gd, fmode_t mode)
 {
         struct drbd_conf *mdev = gd->private_data;
+        lock_kernel();
         mdev->open_cnt--;
+        unlock_kernel();
         return 0;
 }
 
@@ -2660,9 +2596,20 @@ static void drbd_unplug_fn(struct request_queue *q)
 
 static void drbd_set_defaults(struct drbd_conf *mdev)
 {
-        mdev->sync_conf.after      = DRBD_AFTER_DEF;
-        mdev->sync_conf.rate       = DRBD_RATE_DEF;
-        mdev->sync_conf.al_extents = DRBD_AL_EXTENTS_DEF;
+        /* This way we get a compile error when sync_conf grows,
+           and we forgot to initialize it here */
+        mdev->sync_conf = (struct syncer_conf) {
+                /* .rate = */           DRBD_RATE_DEF,
+                /* .after = */          DRBD_AFTER_DEF,
+                /* .al_extents = */     DRBD_AL_EXTENTS_DEF,
+                /* .verify_alg = */     {}, 0,
+                /* .cpu_mask = */       {}, 0,
+                /* .csums_alg = */      {}, 0,
+                /* .use_rle = */        0
+        };
+
+        /* Have to use that way, because the layout differs between
+           big endian and little endian */
         mdev->state = (union drbd_state) {
                 { .role = R_SECONDARY,
                   .peer = R_UNKNOWN,
@@ -2721,24 +2668,17 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
         INIT_LIST_HEAD(&mdev->unplug_work.list);
         INIT_LIST_HEAD(&mdev->md_sync_work.list);
         INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
-        INIT_LIST_HEAD(&mdev->delay_probes);
-        INIT_LIST_HEAD(&mdev->delay_probe_work.list);
 
         mdev->resync_work.cb  = w_resync_inactive;
         mdev->unplug_work.cb  = w_send_write_hint;
         mdev->md_sync_work.cb = w_md_sync;
         mdev->bm_io_work.w.cb = w_bitmap_io;
-        mdev->delay_probe_work.cb = w_delay_probes;
         init_timer(&mdev->resync_timer);
         init_timer(&mdev->md_sync_timer);
-        init_timer(&mdev->delay_probe_timer);
         mdev->resync_timer.function = resync_timer_fn;
         mdev->resync_timer.data = (unsigned long) mdev;
         mdev->md_sync_timer.function = md_sync_timer_fn;
         mdev->md_sync_timer.data = (unsigned long) mdev;
-        mdev->delay_probe_timer.function = delay_probe_timer_fn;
-        mdev->delay_probe_timer.data = (unsigned long) mdev;
-
 
         init_waitqueue_head(&mdev->misc_wait);
         init_waitqueue_head(&mdev->state_wait);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 2151f18b21de..73131c5ae339 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1557,10 +1557,6 @@ static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *n
                 sc.rate       = DRBD_RATE_DEF;
                 sc.after      = DRBD_AFTER_DEF;
                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
-                sc.dp_volume  = DRBD_DP_VOLUME_DEF;
-                sc.dp_interval = DRBD_DP_INTERVAL_DEF;
-                sc.throttle_th = DRBD_RS_THROTTLE_TH_DEF;
-                sc.hold_off_th = DRBD_RS_HOLD_OFF_TH_DEF;
         } else
                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
 
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index d0f1767ea4c3..be3374b68460 100644
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -73,21 +73,14 @@ static void drbd_syncer_progress(struct drbd_conf *mdev, struct seq_file *seq)
         seq_printf(seq, "sync'ed:%3u.%u%% ", res / 10, res % 10);
         /* if more than 1 GB display in MB */
         if (mdev->rs_total > 0x100000L)
-                seq_printf(seq, "(%lu/%lu)M",
+                seq_printf(seq, "(%lu/%lu)M\n\t",
                             (unsigned long) Bit2KB(rs_left >> 10),
                             (unsigned long) Bit2KB(mdev->rs_total >> 10));
         else
-                seq_printf(seq, "(%lu/%lu)K",
+                seq_printf(seq, "(%lu/%lu)K\n\t",
                             (unsigned long) Bit2KB(rs_left),
                             (unsigned long) Bit2KB(mdev->rs_total));
 
-        if (mdev->state.conn == C_SYNC_TARGET)
-                seq_printf(seq, " queue_delay: %d.%d ms\n\t",
-                           mdev->data_delay / 1000,
-                           (mdev->data_delay % 1000) / 100);
-        else if (mdev->state.conn == C_SYNC_SOURCE)
-                seq_printf(seq, " delay_probe: %u\n\t", mdev->delay_seq);
-
         /* see drivers/md/md.c
          * We do not want to overflow, so the order of operands and
          * the * 100 / 100 trick are important. We do a +1 to be
@@ -135,14 +128,6 @@ static void drbd_syncer_progress(struct drbd_conf *mdev, struct seq_file *seq)
         else
                 seq_printf(seq, " (%ld)", dbdt);
 
-        if (mdev->state.conn == C_SYNC_TARGET) {
-                if (mdev->c_sync_rate > 1000)
-                        seq_printf(seq, " want: %d,%03d",
-                                   mdev->c_sync_rate / 1000, mdev->c_sync_rate % 1000);
-                else
-                        seq_printf(seq, " want: %d", mdev->c_sync_rate);
-        }
-
         seq_printf(seq, " K/sec\n");
 }
 
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index ec1711f7c5c5..081522d3c742 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1180,7 +1180,7 @@ next_bio:
         bio->bi_sector = sector;
         bio->bi_bdev = mdev->ldev->backing_bdev;
         /* we special case some flags in the multi-bio case, see below
-         * (BIO_RW_UNPLUG, BIO_RW_BARRIER) */
+         * (REQ_UNPLUG, REQ_HARDBARRIER) */
         bio->bi_rw = rw;
         bio->bi_private = e;
         bio->bi_end_io = drbd_endio_sec;
@@ -1209,16 +1209,16 @@ next_bio:
                 bios = bios->bi_next;
                 bio->bi_next = NULL;
 
-                /* strip off BIO_RW_UNPLUG unless it is the last bio */
+                /* strip off REQ_UNPLUG unless it is the last bio */
                 if (bios)
-                        bio->bi_rw &= ~(1<<BIO_RW_UNPLUG);
+                        bio->bi_rw &= ~REQ_UNPLUG;
 
                 drbd_generic_make_request(mdev, fault_type, bio);
 
-                /* strip off BIO_RW_BARRIER,
+                /* strip off REQ_HARDBARRIER,
                  * unless it is the first or last bio */
                 if (bios && bios->bi_next)
-                        bios->bi_rw &= ~(1<<BIO_RW_BARRIER);
+                        bios->bi_rw &= ~REQ_HARDBARRIER;
         } while (bios);
         maybe_kick_lo(mdev);
         return 0;
@@ -1233,7 +1233,7 @@ fail:
 }
 
 /**
- * w_e_reissue() - Worker callback; Resubmit a bio, without BIO_RW_BARRIER set
+ * w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set
  * @mdev:       DRBD device.
  * @w:          work object.
  * @cancel:     The connection will be closed anyways (unused in this callback)
@@ -1245,7 +1245,7 @@ int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __relea
            (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch)
            so that we can finish that epoch in drbd_may_finish_epoch().
            That is necessary if we already have a long chain of Epochs, before
-           we realize that BIO_RW_BARRIER is actually not supported */
+           we realize that REQ_HARDBARRIER is actually not supported */
 
         /* As long as the -ENOTSUPP on the barrier is reported immediately
            that will never trigger. If it is reported late, we will just
@@ -1824,14 +1824,14 @@ static int receive_Data(struct drbd_conf *mdev, struct p_header *h)
                 epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list);
                 if (epoch == e->epoch) {
                         set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
-                        rw |= (1<<BIO_RW_BARRIER);
+                        rw |= REQ_HARDBARRIER;
                         e->flags |= EE_IS_BARRIER;
                 } else {
                         if (atomic_read(&epoch->epoch_size) > 1 ||
                             !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) {
                                 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
                                 set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
-                                rw |= (1<<BIO_RW_BARRIER);
+                                rw |= REQ_HARDBARRIER;
                                 e->flags |= EE_IS_BARRIER;
                         }
                 }
@@ -1841,10 +1841,10 @@ static int receive_Data(struct drbd_conf *mdev, struct p_header *h)
         dp_flags = be32_to_cpu(p->dp_flags);
         if (dp_flags & DP_HARDBARRIER) {
                 dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n");
-                /* rw |= (1<<BIO_RW_BARRIER); */
+                /* rw |= REQ_HARDBARRIER; */
         }
         if (dp_flags & DP_RW_SYNC)
-                rw |= (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
+                rw |= REQ_SYNC | REQ_UNPLUG;
         if (dp_flags & DP_MAY_SET_IN_SYNC)
                 e->flags |= EE_MAY_SET_IN_SYNC;
 
@@ -3555,14 +3555,15 @@ static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h)
         return ok;
 }
 
-static int receive_skip(struct drbd_conf *mdev, struct p_header *h)
+static int receive_skip_(struct drbd_conf *mdev, struct p_header *h, int silent)
 {
         /* TODO zero copy sink :) */
         static char sink[128];
         int size, want, r;
 
-        dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
-             h->command, h->length);
+        if (!silent)
+                dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
+                     h->command, h->length);
 
         size = h->length;
         while (size > 0) {
@@ -3574,101 +3575,25 @@ static int receive_skip(struct drbd_conf *mdev, struct p_header *h)
         return size == 0;
 }
 
-static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h)
-{
-        if (mdev->state.disk >= D_INCONSISTENT)
-                drbd_kick_lo(mdev);
-
-        /* Make sure we've acked all the TCP data associated
-         * with the data requests being unplugged */
-        drbd_tcp_quickack(mdev->data.socket);
-
-        return TRUE;
-}
-
-static void timeval_sub_us(struct timeval* tv, unsigned int us)
+static int receive_skip(struct drbd_conf *mdev, struct p_header *h)
 {
-        tv->tv_sec -= us / 1000000;
-        us = us % 1000000;
-        if (tv->tv_usec > us) {
-                tv->tv_usec += 1000000;
-                tv->tv_sec--;
-        }
-        tv->tv_usec -= us;
+        return receive_skip_(mdev, h, 0);
 }
 
-static void got_delay_probe(struct drbd_conf *mdev, int from, struct p_delay_probe *p)
+static int receive_skip_silent(struct drbd_conf *mdev, struct p_header *h)
 {
-        struct delay_probe *dp;
-        struct list_head *le;
-        struct timeval now;
-        int seq_num;
-        int offset;
-        int data_delay;
-
-        seq_num = be32_to_cpu(p->seq_num);
-        offset  = be32_to_cpu(p->offset);
-
-        spin_lock(&mdev->peer_seq_lock);
-        if (!list_empty(&mdev->delay_probes)) {
-                if (from == USE_DATA_SOCKET)
-                        le = mdev->delay_probes.next;
-                else
-                        le = mdev->delay_probes.prev;
-
-                dp = list_entry(le, struct delay_probe, list);
-
-                if (dp->seq_num == seq_num) {
-                        list_del(le);
-                        spin_unlock(&mdev->peer_seq_lock);
-                        do_gettimeofday(&now);
-                        timeval_sub_us(&now, offset);
-                        data_delay =
-                                now.tv_usec - dp->time.tv_usec +
-                                (now.tv_sec - dp->time.tv_sec) * 1000000;
-
-                        if (data_delay > 0)
-                                mdev->data_delay = data_delay;
-
-                        kfree(dp);
-                        return;
-                }
-
-                if (dp->seq_num > seq_num) {
-                        spin_unlock(&mdev->peer_seq_lock);
-                        dev_warn(DEV, "Previous allocation failure of struct delay_probe?\n");
-                        return; /* Do not alloca a struct delay_probe.... */
-                }
-        }
-        spin_unlock(&mdev->peer_seq_lock);
-
-        dp = kmalloc(sizeof(struct delay_probe), GFP_NOIO);
-        if (!dp) {
-                dev_warn(DEV, "Failed to allocate a struct delay_probe, do not worry.\n");
-                return;
-        }
-
-        dp->seq_num = seq_num;
-        do_gettimeofday(&dp->time);
-        timeval_sub_us(&dp->time, offset);
-
-        spin_lock(&mdev->peer_seq_lock);
-        if (from == USE_DATA_SOCKET)
-                list_add(&dp->list, &mdev->delay_probes);
-        else
-                list_add_tail(&dp->list, &mdev->delay_probes);
-        spin_unlock(&mdev->peer_seq_lock);
+        return receive_skip_(mdev, h, 1);
 }
 
-static int receive_delay_probe(struct drbd_conf *mdev, struct p_header *h)
+static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h)
 {
-        struct p_delay_probe *p = (struct p_delay_probe *)h;
+        if (mdev->state.disk >= D_INCONSISTENT)
+                drbd_kick_lo(mdev);
 
-        ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
-        if (drbd_recv(mdev, h->payload, h->length) != h->length)
-                return FALSE;
+        /* Make sure we've acked all the TCP data associated
+         * with the data requests being unplugged */
+        drbd_tcp_quickack(mdev->data.socket);
 
-        got_delay_probe(mdev, USE_DATA_SOCKET, p);
         return TRUE;
 }
 
@@ -3695,7 +3620,7 @@ static drbd_cmd_handler_f drbd_default_handler[] = {
         [P_OV_REQUEST]      = receive_DataRequest,
         [P_OV_REPLY]        = receive_DataRequest,
         [P_CSUM_RS_REQUEST]    = receive_DataRequest,
-        [P_DELAY_PROBE]     = receive_delay_probe,
+        [P_DELAY_PROBE]     = receive_skip_silent,
         /* anything missing from this table is in
          * the asender_tbl, see get_asender_cmd */
         [P_MAX_CMD]         = NULL,
@@ -4472,11 +4397,9 @@ static int got_OVResult(struct drbd_conf *mdev, struct p_header *h)
         return TRUE;
 }
 
-static int got_delay_probe_m(struct drbd_conf *mdev, struct p_header *h)
+static int got_something_to_ignore_m(struct drbd_conf *mdev, struct p_header *h)
 {
-        struct p_delay_probe *p = (struct p_delay_probe *)h;
-
-        got_delay_probe(mdev, USE_META_SOCKET, p);
+        /* IGNORE */
         return TRUE;
 }
 
@@ -4504,7 +4427,7 @@ static struct asender_cmd *get_asender_cmd(int cmd)
         [P_BARRIER_ACK]     = { sizeof(struct p_barrier_ack), got_BarrierAck },
         [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
         [P_RS_IS_IN_SYNC]   = { sizeof(struct p_block_ack), got_IsInSync },
-        [P_DELAY_PROBE]     = { sizeof(struct p_delay_probe), got_delay_probe_m },
+        [P_DELAY_PROBE]     = { sizeof(struct p_delay_probe), got_something_to_ignore_m },
         [P_MAX_CMD]         = { 0, NULL },
         };
         if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 654f1ef5cbb0..f761d98a4e90 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -997,7 +997,7 @@ int drbd_make_request_26(struct request_queue *q, struct bio *bio)
          * because of those XXX, this is not yet enabled,
          * i.e. in drbd_init_set_defaults we set the NO_BARRIER_SUPP bit.
          */
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER) && test_bit(NO_BARRIER_SUPP, &mdev->flags))) {
+        if (unlikely(bio->bi_rw & REQ_HARDBARRIER) && test_bit(NO_BARRIER_SUPP, &mdev->flags)) {
                 /* dev_warn(DEV, "Rejecting barrier request as underlying device does not support\n"); */
                 bio_endio(bio, -EOPNOTSUPP);
                 return 0;
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index b623ceee2a4a..ca4a16cea2d8 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -424,18 +424,6 @@ void resync_timer_fn(unsigned long data)
                 drbd_queue_work(&mdev->data.work, &mdev->resync_work);
 }
 
-static int calc_resync_rate(struct drbd_conf *mdev)
-{
-        int d = mdev->data_delay / 1000; /* us -> ms */
-        int td = mdev->sync_conf.throttle_th * 100;  /* 0.1s -> ms */
-        int hd = mdev->sync_conf.hold_off_th * 100;  /* 0.1s -> ms */
-        int cr = mdev->sync_conf.rate;
-
-        return d <= td ? cr :
-                d >= hd ? 0 :
-                cr + (cr * (td - d) / (hd - td));
-}
-
 int w_make_resync_request(struct drbd_conf *mdev,
                 struct drbd_work *w, int cancel)
 {
@@ -473,8 +461,7 @@ int w_make_resync_request(struct drbd_conf *mdev,
         max_segment_size = mdev->agreed_pro_version < 94 ?
                 queue_max_segment_size(mdev->rq_queue) : DRBD_MAX_SEGMENT_SIZE;
 
-        mdev->c_sync_rate = calc_resync_rate(mdev);
-        number = SLEEP_TIME * mdev->c_sync_rate  / ((BM_BLOCK_SIZE / 1024) * HZ);
+        number = SLEEP_TIME * mdev->sync_conf.rate  / ((BM_BLOCK_SIZE / 1024) * HZ);
         pe = atomic_read(&mdev->rs_pending_cnt);
 
         mutex_lock(&mdev->data.mutex);
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 90c4038702da..cf04c1b234ed 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -178,6 +178,7 @@ static int print_unex = 1;
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/bio.h>
+#include <linux/smp_lock.h>
 #include <linux/string.h>
 #include <linux/jiffies.h>
 #include <linux/fcntl.h>
@@ -514,8 +515,6 @@ static unsigned long fdc_busy;
 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
 static DECLARE_WAIT_QUEUE_HEAD(command_done);
 
-#define NO_SIGNAL (!interruptible || !signal_pending(current))
-
 /* Errors during formatting are counted here. */
 static int format_errors;
 
@@ -539,7 +538,7 @@ static int max_buffer_sectors;
 
 static int *errors;
 typedef void (*done_f)(int);
-static struct cont_t {
+static const struct cont_t {
         void (*interrupt)(void);
                                 /* this is called after the interrupt of the
                                  * main command */
@@ -578,7 +577,7 @@ static void reset_fdc(void);
 #define NEED_1_RECAL    -2
 #define NEED_2_RECAL    -3
 
-static int usage_count;
+static atomic_t usage_count = ATOMIC_INIT(0);
 
 /* buffer related variables */
 static int buffer_track = -1;
@@ -858,36 +857,15 @@ static void set_fdc(int drive)
 }
 
 /* locks the driver */
-static int _lock_fdc(int drive, bool interruptible, int line)
+static int lock_fdc(int drive, bool interruptible)
 {
-        if (!usage_count) {
-                pr_err("Trying to lock fdc while usage count=0 at line %d\n",
-                       line);
+        if (WARN(atomic_read(&usage_count) == 0,
+                 "Trying to lock fdc while usage count=0\n"))
                 return -1;
-        }
-
-        if (test_and_set_bit(0, &fdc_busy)) {
-                DECLARE_WAITQUEUE(wait, current);
-                add_wait_queue(&fdc_wait, &wait);
-
-                for (;;) {
-                        set_current_state(TASK_INTERRUPTIBLE);
-
-                        if (!test_and_set_bit(0, &fdc_busy))
-                                break;
 
-                        schedule();
-
-                        if (!NO_SIGNAL) {
-                                remove_wait_queue(&fdc_wait, &wait);
-                                return -EINTR;
-                        }
-                }
+        if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
+                return -EINTR;
 
-                set_current_state(TASK_RUNNING);
-                remove_wait_queue(&fdc_wait, &wait);
-                flush_scheduled_work();
-        }
         command_status = FD_COMMAND_NONE;
 
         __reschedule_timeout(drive, "lock fdc");
@@ -895,11 +873,8 @@ static int _lock_fdc(int drive, bool interruptible, int line)
         return 0;
 }
 
-#define lock_fdc(drive, interruptible)                  \
-        _lock_fdc(drive, interruptible, __LINE__)
-
 /* unlocks the driver */
-static inline void unlock_fdc(void)
+static void unlock_fdc(void)
 {
         unsigned long flags;
 
@@ -1224,7 +1199,7 @@ static int need_more_output(void)
 /* Set perpendicular mode as required, based on data rate, if supported.
  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
  */
-static inline void perpendicular_mode(void)
+static void perpendicular_mode(void)
 {
         unsigned char perp_mode;
 
@@ -1995,14 +1970,14 @@ static void do_wakeup(void)
         wake_up(&command_done);
 }
 
-static struct cont_t wakeup_cont = {
+static const struct cont_t wakeup_cont = {
         .interrupt      = empty,
         .redo           = do_wakeup,
         .error          = empty,
         .done           = (done_f)empty
 };
 
-static struct cont_t intr_cont = {
+static const struct cont_t intr_cont = {
         .interrupt      = empty,
         .redo           = process_fd_request,
         .error          = empty,
@@ -2015,25 +1990,10 @@ static int wait_til_done(void (*handler)(void), bool interruptible)
 
         schedule_bh(handler);
 
-        if (command_status < 2 && NO_SIGNAL) {
-                DECLARE_WAITQUEUE(wait, current);
-
-                add_wait_queue(&command_done, &wait);
-                for (;;) {
-                        set_current_state(interruptible ?
-                                          TASK_INTERRUPTIBLE :
-                                          TASK_UNINTERRUPTIBLE);
-
-                        if (command_status >= 2 || !NO_SIGNAL)
-                                break;
-
-                        is_alive(__func__, "");
-                        schedule();
-                }
-
-                set_current_state(TASK_RUNNING);
-                remove_wait_queue(&command_done, &wait);
-        }
+        if (interruptible)
+                wait_event_interruptible(command_done, command_status >= 2);
+        else
+                wait_event(command_done, command_status >= 2);
 
         if (command_status < 2) {
                 cancel_activity();
@@ -2223,7 +2183,7 @@ static void redo_format(void)
         debugt(__func__, "queue format request");
 }
 
-static struct cont_t format_cont = {
+static const struct cont_t format_cont = {
         .interrupt      = format_interrupt,
         .redo           = redo_format,
         .error          = bad_flp_intr,
@@ -2583,10 +2543,8 @@ static int make_raw_rw_request(void)
         int tracksize;
         int ssize;
 
-        if (max_buffer_sectors == 0) {
-                pr_info("VFS: Block I/O scheduled on unopened device\n");
+        if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
                 return 0;
-        }
 
         set_fdc((long)current_req->rq_disk->private_data);
 
@@ -2921,7 +2879,7 @@ do_request:
         return;
 }
 
-static struct cont_t rw_cont = {
+static const struct cont_t rw_cont = {
         .interrupt      = rw_interrupt,
         .redo           = redo_fd_request,
         .error          = bad_flp_intr,
@@ -2936,19 +2894,16 @@ static void process_fd_request(void)
 
 static void do_fd_request(struct request_queue *q)
 {
-        if (max_buffer_sectors == 0) {
-                pr_info("VFS: %s called on non-open device\n", __func__);
+        if (WARN(max_buffer_sectors == 0,
+                 "VFS: %s called on non-open device\n", __func__))
                 return;
-        }
 
-        if (usage_count == 0) {
-                pr_info("warning: usage count=0, current_req=%p exiting\n",
-                        current_req);
-                pr_info("sect=%ld type=%x flags=%x\n",
-                        (long)blk_rq_pos(current_req), current_req->cmd_type,
-                        current_req->cmd_flags);
+        if (WARN(atomic_read(&usage_count) == 0,
+                 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
+                 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
+                 current_req->cmd_flags))
                 return;
-        }
+
         if (test_bit(0, &fdc_busy)) {
                 /* fdc busy, this new request will be treated when the
                    current one is done */
@@ -2960,7 +2915,7 @@ static void do_fd_request(struct request_queue *q)
         is_alive(__func__, "");
 }
 
-static struct cont_t poll_cont = {
+static const struct cont_t poll_cont = {
         .interrupt      = success_and_wakeup,
         .redo           = floppy_ready,
         .error          = generic_failure,
@@ -2991,7 +2946,7 @@ static void reset_intr(void)
         pr_info("weird, reset interrupt called\n");
 }
 
-static struct cont_t reset_cont = {
+static const struct cont_t reset_cont = {
         .interrupt      = reset_intr,
         .redo           = success_and_wakeup,
         .error          = generic_failure,
@@ -3033,7 +2988,7 @@ static inline int fd_copyin(void __user *param, void *address,
         return copy_from_user(address, param, size) ? -EFAULT : 0;
 }
 
-static inline const char *drive_name(int type, int drive)
+static const char *drive_name(int type, int drive)
 {
         struct floppy_struct *floppy;
 
@@ -3096,14 +3051,14 @@ static void raw_cmd_done(int flag)
         generic_done(flag);
 }
 
-static struct cont_t raw_cmd_cont = {
+static const struct cont_t raw_cmd_cont = {
         .interrupt      = success_and_wakeup,
         .redo           = floppy_start,
         .error          = generic_failure,
         .done           = raw_cmd_done
 };
 
-static inline int raw_cmd_copyout(int cmd, void __user *param,
+static int raw_cmd_copyout(int cmd, void __user *param,
                                   struct floppy_raw_cmd *ptr)
 {
         int ret;
@@ -3148,7 +3103,7 @@ static void raw_cmd_free(struct floppy_raw_cmd **ptr)
         }
 }
 
-static inline int raw_cmd_copyin(int cmd, void __user *param,
+static int raw_cmd_copyin(int cmd, void __user *param,
                                  struct floppy_raw_cmd **rcmd)
 {
         struct floppy_raw_cmd *ptr;
@@ -3266,7 +3221,7 @@ static int invalidate_drive(struct block_device *bdev)
         return 0;
 }
 
-static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
+static int set_geometry(unsigned int cmd, struct floppy_struct *g,
                                int drive, int type, struct block_device *bdev)
 {
         int cnt;
@@ -3337,7 +3292,7 @@ static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
 }
 
 /* handle obsolete ioctl's */
-static int ioctl_table[] = {
+static unsigned int ioctl_table[] = {
         FDCLRPRM,
         FDSETPRM,
         FDDEFPRM,
@@ -3365,7 +3320,7 @@ static int ioctl_table[] = {
         FDTWADDLE
 };
 
-static inline int normalize_ioctl(int *cmd, int *size)
+static int normalize_ioctl(unsigned int *cmd, int *size)
 {
         int i;
 
@@ -3417,7 +3372,7 @@ static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
         return 0;
 }
 
-static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
+static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
                     unsigned long param)
 {
         int drive = (long)bdev->bd_disk->private_data;
@@ -3593,6 +3548,18 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
         return 0;
 }
 
+static int fd_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long param)
+{
+        int ret;
+
+        lock_kernel();
+        ret = fd_locked_ioctl(bdev, mode, cmd, param);
+        unlock_kernel();
+
+        return ret;
+}
+
 static void __init config_types(void)
 {
         bool has_drive = false;
@@ -3649,6 +3616,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         int drive = (long)disk->private_data;
 
+        lock_kernel();
         mutex_lock(&open_lock);
         if (UDRS->fd_ref < 0)
                 UDRS->fd_ref = 0;
@@ -3659,6 +3627,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
         if (!UDRS->fd_ref)
                 opened_bdev[drive] = NULL;
         mutex_unlock(&open_lock);
+        unlock_kernel();
 
         return 0;
 }
@@ -3676,6 +3645,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         int res = -EBUSY;
         char *tmp;
 
+        lock_kernel();
         mutex_lock(&open_lock);
         old_dev = UDRS->fd_device;
         if (opened_bdev[drive] && opened_bdev[drive] != bdev)
@@ -3752,6 +3722,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
                         goto out;
         }
         mutex_unlock(&open_lock);
+        unlock_kernel();
         return 0;
 out:
         if (UDRS->fd_ref < 0)
@@ -3762,6 +3733,7 @@ out:
                 opened_bdev[drive] = NULL;
 out2:
         mutex_unlock(&open_lock);
+        unlock_kernel();
         return res;
 }
 
@@ -3829,6 +3801,7 @@ static int __floppy_read_block_0(struct block_device *bdev)
         bio.bi_size = size;
         bio.bi_bdev = bdev;
         bio.bi_sector = 0;
+        bio.bi_flags = BIO_QUIET;
         init_completion(&complete);
         bio.bi_private = &complete;
         bio.bi_end_io = floppy_rb0_complete;
@@ -3857,10 +3830,10 @@ static int floppy_revalidate(struct gendisk *disk)
         if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
             test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
             test_bit(drive, &fake_change) || NO_GEOM) {
-                if (usage_count == 0) {
-                        pr_info("VFS: revalidate called on non-open device.\n");
+                if (WARN(atomic_read(&usage_count) == 0,
+                         "VFS: revalidate called on non-open device.\n"))
                         return -EFAULT;
-                }
+
                 lock_fdc(drive, false);
                 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
                       test_bit(FD_VERIFY_BIT, &UDRS->flags));
@@ -3893,7 +3866,7 @@ static const struct block_device_operations floppy_fops = {
         .owner                  = THIS_MODULE,
         .open                   = floppy_open,
         .release                = floppy_release,
-        .locked_ioctl           = fd_ioctl,
+        .ioctl                  = fd_ioctl,
         .getgeo                 = fd_getgeo,
         .media_changed          = check_floppy_change,
         .revalidate_disk        = floppy_revalidate,
@@ -4126,7 +4099,7 @@ static ssize_t floppy_cmos_show(struct device *dev,
         return sprintf(buf, "%X\n", UDP->cmos);
 }
 
-DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
+static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
 
 static void floppy_device_release(struct device *dev)
 {
@@ -4175,6 +4148,9 @@ static int __init floppy_init(void)
         int i, unit, drive;
         int err, dr;
 
+        set_debugt();
+        interruptjiffies = resultjiffies = jiffies;
+
 #if defined(CONFIG_PPC)
         if (check_legacy_ioport(FDC1))
                 return -ENODEV;
@@ -4353,7 +4329,7 @@ out_unreg_platform_dev:
         platform_device_unregister(&floppy_device[drive]);
 out_flush_work:
         flush_scheduled_work();
-        if (usage_count)
+        if (atomic_read(&usage_count))
                 floppy_release_irq_and_dma();
 out_unreg_region:
         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
@@ -4370,8 +4346,6 @@ out_put_disk:
         return err;
 }
 
-static DEFINE_SPINLOCK(floppy_usage_lock);
-
 static const struct io_region {
         int offset;
         int size;
@@ -4417,14 +4391,8 @@ static void floppy_release_regions(int fdc)
 
 static int floppy_grab_irq_and_dma(void)
 {
-        unsigned long flags;
-
-        spin_lock_irqsave(&floppy_usage_lock, flags);
-        if (usage_count++) {
-                spin_unlock_irqrestore(&floppy_usage_lock, flags);
+        if (atomic_inc_return(&usage_count) > 1)
                 return 0;
-        }
-        spin_unlock_irqrestore(&floppy_usage_lock, flags);
 
         /*
          * We might have scheduled a free_irq(), wait it to
@@ -4435,9 +4403,7 @@ static int floppy_grab_irq_and_dma(void)
         if (fd_request_irq()) {
                 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
                        FLOPPY_IRQ);
-                spin_lock_irqsave(&floppy_usage_lock, flags);
-                usage_count--;
-                spin_unlock_irqrestore(&floppy_usage_lock, flags);
+                atomic_dec(&usage_count);
                 return -1;
         }
         if (fd_request_dma()) {
@@ -4447,9 +4413,7 @@ static int floppy_grab_irq_and_dma(void)
                         use_virtual_dma = can_use_virtual_dma = 1;
                 if (!(can_use_virtual_dma & 1)) {
                         fd_free_irq();
-                        spin_lock_irqsave(&floppy_usage_lock, flags);
-                        usage_count--;
-                        spin_unlock_irqrestore(&floppy_usage_lock, flags);
+                        atomic_dec(&usage_count);
                         return -1;
                 }
         }
@@ -4484,9 +4448,7 @@ cleanup:
         fd_free_dma();
         while (--fdc >= 0)
                 floppy_release_regions(fdc);
-        spin_lock_irqsave(&floppy_usage_lock, flags);
-        usage_count--;
-        spin_unlock_irqrestore(&floppy_usage_lock, flags);
+        atomic_dec(&usage_count);
         return -1;
 }
 
@@ -4498,14 +4460,10 @@ static void floppy_release_irq_and_dma(void)
 #endif
         long tmpsize;
         unsigned long tmpaddr;
-        unsigned long flags;
 
-        spin_lock_irqsave(&floppy_usage_lock, flags);
-        if (--usage_count) {
-                spin_unlock_irqrestore(&floppy_usage_lock, flags);
+        if (!atomic_dec_and_test(&usage_count))
                 return;
-        }
-        spin_unlock_irqrestore(&floppy_usage_lock, flags);
+
         if (irqdma_allocated) {
                 fd_disable_dma();
                 fd_free_dma();
@@ -4598,7 +4556,7 @@ static void __exit floppy_module_exit(void)
         del_timer_sync(&fd_timer);
         blk_cleanup_queue(floppy_queue);
 
-        if (usage_count)
+        if (atomic_read(&usage_count))
                 floppy_release_irq_and_dma();
 
         /* eject disk, if any */
diff --git a/drivers/block/hd.c b/drivers/block/hd.c
index 81c78b3ce2df..30ec6b37424e 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -627,7 +627,7 @@ repeat:
                 req_data_dir(req) == READ ? "read" : "writ",
                 cyl, head, sec, nsect, req->buffer);
 #endif
-        if (blk_fs_request(req)) {
+        if (req->cmd_type == REQ_TYPE_FS) {
                 switch (rq_data_dir(req)) {
                 case READ:
                         hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_READ,
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6120922f459f..f3c636d23718 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -67,6 +67,7 @@
 #include <linux/compat.h>
 #include <linux/suspend.h>
 #include <linux/freezer.h>
+#include <linux/smp_lock.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>          /* for invalidate_bdev() */
 #include <linux/completion.h>
@@ -476,7 +477,7 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
         pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset;
 
         if (bio_rw(bio) == WRITE) {
-                bool barrier = bio_rw_flagged(bio, BIO_RW_BARRIER);
+                bool barrier = (bio->bi_rw & REQ_HARDBARRIER);
                 struct file *file = lo->lo_backing_file;
 
                 if (barrier) {
@@ -831,7 +832,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
         lo->lo_queue->unplug_fn = loop_unplug;
 
         if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
-                blk_queue_ordered(lo->lo_queue, QUEUE_ORDERED_DRAIN, NULL);
+                blk_queue_ordered(lo->lo_queue, QUEUE_ORDERED_DRAIN);
 
         set_capacity(lo->lo_disk, size);
         bd_set_size(bdev, size << 9);
@@ -1408,9 +1409,11 @@ static int lo_open(struct block_device *bdev, fmode_t mode)
 {
         struct loop_device *lo = bdev->bd_disk->private_data;
 
+        lock_kernel();
         mutex_lock(&lo->lo_ctl_mutex);
         lo->lo_refcnt++;
         mutex_unlock(&lo->lo_ctl_mutex);
+        unlock_kernel();
 
         return 0;
 }
@@ -1420,6 +1423,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
         struct loop_device *lo = disk->private_data;
         int err;
 
+        lock_kernel();
         mutex_lock(&lo->lo_ctl_mutex);
 
         if (--lo->lo_refcnt)
@@ -1444,6 +1448,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
 out:
         mutex_unlock(&lo->lo_ctl_mutex);
 out_unlocked:
+        lock_kernel();
         return 0;
 }
 
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index 28db925dbdad..b82c5ce5e9df 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -670,7 +670,7 @@ static void mg_request_poll(struct request_queue *q)
                                 break;
                 }
 
-                if (unlikely(!blk_fs_request(host->req))) {
+                if (unlikely(host->req->cmd_type != REQ_TYPE_FS)) {
                         mg_end_request_cur(host, -EIO);
                         continue;
                 }
@@ -756,7 +756,7 @@ static void mg_request(struct request_queue *q)
                         continue;
                 }
 
-                if (unlikely(!blk_fs_request(req))) {
+                if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
                         mg_end_request_cur(host, -EIO);
                         continue;
                 }
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 16c3c8613cd3..0daa422aa281 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -24,6 +24,7 @@
 #include <linux/errno.h>
 #include <linux/file.h>
 #include <linux/ioctl.h>
+#include <linux/smp_lock.h>
 #include <linux/compiler.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
@@ -448,7 +449,7 @@ static void nbd_clear_que(struct nbd_device *lo)
 
 static void nbd_handle_req(struct nbd_device *lo, struct request *req)
 {
-        if (!blk_fs_request(req))
+        if (req->cmd_type != REQ_TYPE_FS)
                 goto error_out;
 
         nbd_cmd(req) = NBD_CMD_READ;
@@ -716,9 +717,11 @@ static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
         dprintk(DBG_IOCTL, "%s: nbd_ioctl cmd=%s(0x%x) arg=%lu\n",
                         lo->disk->disk_name, ioctl_cmd_to_ascii(cmd), cmd, arg);
 
+        lock_kernel();
         mutex_lock(&lo->tx_lock);
         error = __nbd_ioctl(bdev, lo, cmd, arg);
         mutex_unlock(&lo->tx_lock);
+        unlock_kernel();
 
         return error;
 }
@@ -726,7 +729,7 @@ static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
 static const struct block_device_operations nbd_fops =
 {
         .owner =        THIS_MODULE,
-        .locked_ioctl = nbd_ioctl,
+        .ioctl =        nbd_ioctl,
 };
 
 /*
diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
index 6cd8b705b11b..2284b4f05c62 100644
--- a/drivers/block/osdblk.c
+++ b/drivers/block/osdblk.c
@@ -310,7 +310,8 @@ static void osdblk_rq_fn(struct request_queue *q)
                         break;
 
                 /* filter out block requests we don't understand */
-                if (!blk_fs_request(rq) && !blk_barrier_rq(rq)) {
+                if (rq->cmd_type != REQ_TYPE_FS &&
+                    !(rq->cmd_flags & REQ_HARDBARRIER)) {
                         blk_end_request_all(rq, 0);
                         continue;
                 }
@@ -322,7 +323,7 @@ static void osdblk_rq_fn(struct request_queue *q)
                  * driver-specific, etc.
                  */
 
-                do_flush = (rq->special == (void *) 0xdeadbeefUL);
+                do_flush = rq->cmd_flags & REQ_FLUSH;
                 do_write = (rq_data_dir(rq) == WRITE);
 
                 if (!do_flush) { /* osd_flush does not use a bio */
@@ -379,14 +380,6 @@ static void osdblk_rq_fn(struct request_queue *q)
         }
 }
 
-static void osdblk_prepare_flush(struct request_queue *q, struct request *rq)
-{
-        /* add driver-specific marker, to indicate that this request
-         * is a flush command
-         */
-        rq->special = (void *) 0xdeadbeefUL;
-}
-
 static void osdblk_free_disk(struct osdblk_device *osdev)
 {
         struct gendisk *disk = osdev->disk;
@@ -446,7 +439,7 @@ static int osdblk_init_disk(struct osdblk_device *osdev)
         blk_queue_stack_limits(q, osd_request_queue(osdev->osd));
 
         blk_queue_prep_rq(q, blk_queue_start_tag);
-        blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH, osdblk_prepare_flush);
+        blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH);
 
         disk->queue = q;
 
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 71acf4e53356..76f8565e1e8d 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -138,6 +138,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
 #include <linux/cdrom.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 static DEFINE_SPINLOCK(pcd_lock);
@@ -224,13 +225,21 @@ static char *pcd_buf;		/* buffer for request in progress */
 static int pcd_block_open(struct block_device *bdev, fmode_t mode)
 {
         struct pcd_unit *cd = bdev->bd_disk->private_data;
-        return cdrom_open(&cd->info, bdev, mode);
+        int ret;
+
+        lock_kernel();
+        ret = cdrom_open(&cd->info, bdev, mode);
+        unlock_kernel();
+
+        return ret;
 }
 
 static int pcd_block_release(struct gendisk *disk, fmode_t mode)
 {
         struct pcd_unit *cd = disk->private_data;
+        lock_kernel();
         cdrom_release(&cd->info, mode);
+        unlock_kernel();
         return 0;
 }
 
@@ -238,7 +247,13 @@ static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
                                 unsigned cmd, unsigned long arg)
 {
         struct pcd_unit *cd = bdev->bd_disk->private_data;
-        return cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
+        int ret;
+
+        lock_kernel();
+        ret = cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
+        unlock_kernel();
+
+        return ret;
 }
 
 static int pcd_block_media_changed(struct gendisk *disk)
@@ -251,7 +266,7 @@ static const struct block_device_operations pcd_bdops = {
         .owner          = THIS_MODULE,
         .open           = pcd_block_open,
         .release        = pcd_block_release,
-        .locked_ioctl   = pcd_block_ioctl,
+        .ioctl          = pcd_block_ioctl,
         .media_changed  = pcd_block_media_changed,
 };
 
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index c1e5cd029b23..985f0d4f1d1e 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -153,6 +153,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/kernel.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <linux/workqueue.h>
 
@@ -439,7 +440,7 @@ static char *pd_buf;		/* buffer for request in progress */
 
 static enum action do_pd_io_start(void)
 {
-        if (blk_special_request(pd_req)) {
+        if (pd_req->cmd_type == REQ_TYPE_SPECIAL) {
                 phase = pd_special;
                 return pd_special();
         }
@@ -735,12 +736,14 @@ static int pd_open(struct block_device *bdev, fmode_t mode)
 {
         struct pd_unit *disk = bdev->bd_disk->private_data;
 
+        lock_kernel();
         disk->access++;
 
         if (disk->removable) {
                 pd_special_command(disk, pd_media_check);
                 pd_special_command(disk, pd_door_lock);
         }
+        unlock_kernel();
         return 0;
 }
 
@@ -768,8 +771,10 @@ static int pd_ioctl(struct block_device *bdev, fmode_t mode,
 
         switch (cmd) {
         case CDROMEJECT:
+                lock_kernel();
                 if (disk->access == 1)
                         pd_special_command(disk, pd_eject);
+                unlock_kernel();
                 return 0;
         default:
                 return -EINVAL;
@@ -780,8 +785,10 @@ static int pd_release(struct gendisk *p, fmode_t mode)
 {
         struct pd_unit *disk = p->private_data;
 
+        lock_kernel();
         if (!--disk->access && disk->removable)
                 pd_special_command(disk, pd_door_unlock);
+        unlock_kernel();
 
         return 0;
 }
@@ -812,7 +819,7 @@ static const struct block_device_operations pd_fops = {
         .owner          = THIS_MODULE,
         .open           = pd_open,
         .release        = pd_release,
-        .locked_ioctl   = pd_ioctl,
+        .ioctl          = pd_ioctl,
         .getgeo         = pd_getgeo,
         .media_changed  = pd_check_media,
         .revalidate_disk= pd_revalidate
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index c059aab3006b..4457b494882a 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -152,6 +152,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 static DEFINE_SPINLOCK(pf_spin_lock);
@@ -266,7 +267,7 @@ static const struct block_device_operations pf_fops = {
         .owner          = THIS_MODULE,
         .open           = pf_open,
         .release        = pf_release,
-        .locked_ioctl   = pf_ioctl,
+        .ioctl          = pf_ioctl,
         .getgeo         = pf_getgeo,
         .media_changed  = pf_check_media,
 };
@@ -299,20 +300,26 @@ static void __init pf_init_units(void)
 static int pf_open(struct block_device *bdev, fmode_t mode)
 {
         struct pf_unit *pf = bdev->bd_disk->private_data;
+        int ret;
 
+        lock_kernel();
         pf_identify(pf);
 
+        ret = -ENODEV;
         if (pf->media_status == PF_NM)
-                return -ENODEV;
+                goto out;
 
+        ret = -EROFS;
         if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE))
-                return -EROFS;
+                goto out;
 
+        ret = 0;
         pf->access++;
         if (pf->removable)
                 pf_lock(pf, 1);
-
-        return 0;
+out:
+        unlock_kernel();
+        return ret;
 }
 
 static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo)
@@ -342,7 +349,10 @@ static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, u
 
         if (pf->access != 1)
                 return -EBUSY;
+        lock_kernel();
         pf_eject(pf);
+        unlock_kernel();
+
         return 0;
 }
 
@@ -350,14 +360,18 @@ static int pf_release(struct gendisk *disk, fmode_t mode)
 {
         struct pf_unit *pf = disk->private_data;
 
-        if (pf->access <= 0)
+        lock_kernel();
+        if (pf->access <= 0) {
+                unlock_kernel();
                 return -EINVAL;
+        }
 
         pf->access--;
 
         if (!pf->access && pf->removable)
                 pf_lock(pf, 0);
 
+        unlock_kernel();
         return 0;
 
 }
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 8a549db2aa78..b1cbeb59bb76 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -57,6 +57,7 @@
 #include <linux/seq_file.h>
 #include <linux/miscdevice.h>
 #include <linux/freezer.h>
+#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <scsi/scsi_cmnd.h>
@@ -1221,7 +1222,7 @@ static int pkt_start_recovery(struct packet_data *pkt)
         pkt->bio->bi_flags = 1 << BIO_UPTODATE;
         pkt->bio->bi_idx = 0;
 
-        BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
+        BUG_ON(pkt->bio->bi_rw != REQ_WRITE);
         BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
         BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
         BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
@@ -2382,6 +2383,7 @@ static int pkt_open(struct block_device *bdev, fmode_t mode)
 
         VPRINTK(DRIVER_NAME": entering open\n");
 
+        lock_kernel();
         mutex_lock(&ctl_mutex);
         pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
         if (!pd) {
@@ -2409,6 +2411,7 @@ static int pkt_open(struct block_device *bdev, fmode_t mode)
         }
 
         mutex_unlock(&ctl_mutex);
+        unlock_kernel();
         return 0;
 
 out_dec:
@@ -2416,6 +2419,7 @@ out_dec:
 out:
         VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
         mutex_unlock(&ctl_mutex);
+        unlock_kernel();
         return ret;
 }
 
@@ -2424,6 +2428,7 @@ static int pkt_close(struct gendisk *disk, fmode_t mode)
         struct pktcdvd_device *pd = disk->private_data;
         int ret = 0;
 
+        lock_kernel();
         mutex_lock(&ctl_mutex);
         pd->refcnt--;
         BUG_ON(pd->refcnt < 0);
@@ -2432,6 +2437,7 @@ static int pkt_close(struct gendisk *disk, fmode_t mode)
                 pkt_release_dev(pd, flush);
         }
         mutex_unlock(&ctl_mutex);
+        unlock_kernel();
         return ret;
 }
 
@@ -2762,10 +2768,12 @@ out_mem:
 static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
 {
         struct pktcdvd_device *pd = bdev->bd_disk->private_data;
+        int ret;
 
         VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd,
                 MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
 
+        lock_kernel();
         switch (cmd) {
         case CDROMEJECT:
                 /*
@@ -2783,14 +2791,16 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
         case CDROM_LAST_WRITTEN:
         case CDROM_SEND_PACKET:
         case SCSI_IOCTL_SEND_COMMAND:
-                return __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
+                ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
+                break;
 
         default:
                 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
-                return -ENOTTY;
+                ret = -ENOTTY;
         }
+        unlock_kernel();
 
-        return 0;
+        return ret;
 }
 
 static int pkt_media_changed(struct gendisk *disk)
@@ -2812,7 +2822,7 @@ static const struct block_device_operations pktcdvd_ops = {
         .owner =                THIS_MODULE,
         .open =                 pkt_open,
         .release =              pkt_close,
-        .locked_ioctl =         pkt_ioctl,
+        .ioctl =                pkt_ioctl,
         .media_changed =        pkt_media_changed,
 };
 
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index 3b419e3fffa1..e9da874d0419 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -196,13 +196,12 @@ static void ps3disk_do_request(struct ps3_storage_device *dev,
         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 
         while ((req = blk_fetch_request(q))) {
-                if (blk_fs_request(req)) {
-                        if (ps3disk_submit_request_sg(dev, req))
-                                break;
-                } else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
-                           req->cmd[0] == REQ_LB_OP_FLUSH) {
+                if (req->cmd_flags & REQ_FLUSH) {
                         if (ps3disk_submit_flush_request(dev, req))
                                 break;
+                } else if (req->cmd_type == REQ_TYPE_FS) {
+                        if (ps3disk_submit_request_sg(dev, req))
+                                break;
                 } else {
                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
                         __blk_end_request_all(req, -EIO);
@@ -257,8 +256,7 @@ static irqreturn_t ps3disk_interrupt(int irq, void *data)
                 return IRQ_HANDLED;
         }
 
-        if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
-            req->cmd[0] == REQ_LB_OP_FLUSH) {
+        if (req->cmd_flags & REQ_FLUSH) {
                 read = 0;
                 op = "flush";
         } else {
@@ -398,16 +396,6 @@ static int ps3disk_identify(struct ps3_storage_device *dev)
         return 0;
 }
 
-static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
-{
-        struct ps3_storage_device *dev = q->queuedata;
-
-        dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
-
-        req->cmd_type = REQ_TYPE_LINUX_BLOCK;
-        req->cmd[0] = REQ_LB_OP_FLUSH;
-}
-
 static unsigned long ps3disk_mask;
 
 static DEFINE_MUTEX(ps3disk_mask_mutex);
@@ -480,8 +468,7 @@ static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
         blk_queue_dma_alignment(queue, dev->blk_size-1);
         blk_queue_logical_block_size(queue, dev->blk_size);
 
-        blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
-                          ps3disk_prepare_flush);
+        blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH);
 
         blk_queue_max_segments(queue, -1);
         blk_queue_max_segment_size(queue, dev->bounce_size);
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index e463657569ff..2e46815876df 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -20,6 +20,7 @@
 #include <linux/fd.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
@@ -661,11 +662,23 @@ out:
         return err;
 }
 
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = floppy_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         struct floppy_state *fs = disk->private_data;
         struct swim __iomem *base = fs->swd->base;
 
+        lock_kernel();
         if (fs->ref_count < 0)
                 fs->ref_count = 0;
         else if (fs->ref_count > 0)
@@ -673,6 +686,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 
         if (fs->ref_count == 0)
                 swim_motor(base, OFF);
+        unlock_kernel();
 
         return 0;
 }
@@ -690,7 +704,9 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
         case FDEJECT:
                 if (fs->ref_count != 1)
                         return -EBUSY;
+                lock_kernel();
                 err = floppy_eject(fs);
+                unlock_kernel();
                 return err;
 
         case FDGETPRM:
@@ -751,9 +767,9 @@ static int floppy_revalidate(struct gendisk *disk)
 
 static const struct block_device_operations floppy_fops = {
         .owner           = THIS_MODULE,
-        .open            = floppy_open,
+        .open            = floppy_unlocked_open,
         .release         = floppy_release,
-        .locked_ioctl    = floppy_ioctl,
+        .ioctl           = floppy_ioctl,
         .getgeo          = floppy_getgeo,
         .media_changed   = floppy_check_change,
         .revalidate_disk = floppy_revalidate,
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index ed6fb91123ab..cc6a3864822c 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -25,6 +25,7 @@
 #include <linux/ioctl.h>
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
+#include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <asm/io.h>
@@ -839,7 +840,7 @@ static int fd_eject(struct floppy_state *fs)
 static struct floppy_struct floppy_type =
         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 
-static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
+static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
                         unsigned int cmd, unsigned long param)
 {
         struct floppy_state *fs = bdev->bd_disk->private_data;
@@ -867,6 +868,18 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
         return -ENOTTY;
 }
 
+static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
+                                 unsigned int cmd, unsigned long param)
+{
+        int ret;
+
+        lock_kernel();
+        ret = floppy_locked_ioctl(bdev, mode, cmd, param);
+        unlock_kernel();
+
+        return ret;
+}
+
 static int floppy_open(struct block_device *bdev, fmode_t mode)
 {
         struct floppy_state *fs = bdev->bd_disk->private_data;
@@ -936,15 +949,28 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         return 0;
 }
 
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = floppy_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         struct floppy_state *fs = disk->private_data;
         struct swim3 __iomem *sw = fs->swim3;
+        lock_kernel();
         if (fs->ref_count > 0 && --fs->ref_count == 0) {
                 swim3_action(fs, MOTOR_OFF);
                 out_8(&sw->control_bic, 0xff);
                 swim3_select(fs, RELAX);
         }
+        unlock_kernel();
         return 0;
 }
 
@@ -995,9 +1021,9 @@ static int floppy_revalidate(struct gendisk *disk)
 }
 
 static const struct block_device_operations floppy_fops = {
-        .open           = floppy_open,
+        .open           = floppy_unlocked_open,
         .release        = floppy_release,
-        .locked_ioctl   = floppy_ioctl,
+        .ioctl          = floppy_ioctl,
         .media_changed  = floppy_check_change,
         .revalidate_disk= floppy_revalidate,
 };
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 0536b5b29adc..c48e14878582 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -28,6 +28,7 @@
 #include <linux/timer.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <scsi/scsi.h>
 
 #define DRV_NAME "ub"
@@ -648,7 +649,7 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
                 return 0;
         }
 
-        if (lun->changed && !blk_pc_request(rq)) {
+        if (lun->changed && rq->cmd_type != REQ_TYPE_BLOCK_PC) {
                 blk_start_request(rq);
                 ub_end_rq(rq, SAM_STAT_CHECK_CONDITION);
                 return 0;
@@ -684,7 +685,7 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
         }
         urq->nsg = n_elem;
 
-        if (blk_pc_request(rq)) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 ub_cmd_build_packet(sc, lun, cmd, urq);
         } else {
                 ub_cmd_build_block(sc, lun, cmd, urq);
@@ -781,7 +782,7 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
         rq = urq->rq;
 
         if (cmd->error == 0) {
-                if (blk_pc_request(rq)) {
+                if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                         if (cmd->act_len >= rq->resid_len)
                                 rq->resid_len = 0;
                         else
@@ -795,7 +796,7 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
                         }
                 }
         } else {
-                if (blk_pc_request(rq)) {
+                if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                         /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
                         memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE);
                         rq->sense_len = UB_SENSE_SIZE;
@@ -1710,6 +1711,18 @@ err_open:
         return rc;
 }
 
+static int ub_bd_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = ub_bd_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
+
 /*
  */
 static int ub_bd_release(struct gendisk *disk, fmode_t mode)
@@ -1717,7 +1730,10 @@ static int ub_bd_release(struct gendisk *disk, fmode_t mode)
         struct ub_lun *lun = disk->private_data;
         struct ub_dev *sc = lun->udev;
 
+        lock_kernel();
         ub_put(sc);
+        unlock_kernel();
+
         return 0;
 }
 
@@ -1729,8 +1745,13 @@ static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode,
 {
         struct gendisk *disk = bdev->bd_disk;
         void __user *usermem = (void __user *) arg;
+        int ret;
+
+        lock_kernel();
+        ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
+        unlock_kernel();
 
-        return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
+        return ret;
 }
 
 /*
@@ -1792,9 +1813,9 @@ static int ub_bd_media_changed(struct gendisk *disk)
 
 static const struct block_device_operations ub_bd_fops = {
         .owner          = THIS_MODULE,
-        .open           = ub_bd_open,
+        .open           = ub_bd_unlocked_open,
         .release        = ub_bd_release,
-        .locked_ioctl   = ub_bd_ioctl,
+        .ioctl          = ub_bd_ioctl,
         .media_changed  = ub_bd_media_changed,
         .revalidate_disk = ub_bd_revalidate,
 };
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index 2f9470ff8f7c..8be57151f5d6 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -478,7 +478,7 @@ static void process_page(unsigned long data)
                                 le32_to_cpu(desc->local_addr)>>9,
                                 le32_to_cpu(desc->transfer_size));
                         dump_dmastat(card, control);
-                } else if (test_bit(BIO_RW, &bio->bi_rw) &&
+                } else if ((bio->bi_rw & REQ_WRITE) &&
                            le32_to_cpu(desc->local_addr) >> 9 ==
                                 card->init_size) {
                         card->init_size += le32_to_cpu(desc->transfer_size) >> 9;
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index 788d93882ab9..f651e51a3319 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -41,6 +41,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/string.h>
+#include <linux/smp_lock.h>
 #include <linux/dma-mapping.h>
 #include <linux/completion.h>
 #include <linux/device.h>
@@ -175,6 +176,18 @@ static int viodasd_open(struct block_device *bdev, fmode_t mode)
         return 0;
 }
 
+static int viodasd_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = viodasd_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
+
 /*
  * External release entry point.
  */
@@ -183,6 +196,7 @@ static int viodasd_release(struct gendisk *disk, fmode_t mode)
         struct viodasd_device *d = disk->private_data;
         HvLpEvent_Rc hvrc;
 
+        lock_kernel();
         /* Send the event to OS/400.  We DON'T expect a response */
         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                         HvLpEvent_Type_VirtualIo,
@@ -195,6 +209,9 @@ static int viodasd_release(struct gendisk *disk, fmode_t mode)
                         0, 0, 0);
         if (hvrc != 0)
                 pr_warning("HV close call failed %d\n", (int)hvrc);
+
+        unlock_kernel();
+
         return 0;
 }
 
@@ -219,7 +236,7 @@ static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
  */
 static const struct block_device_operations viodasd_fops = {
         .owner = THIS_MODULE,
-        .open = viodasd_open,
+        .open = viodasd_unlocked_open,
         .release = viodasd_release,
         .getgeo = viodasd_getgeo,
 };
@@ -361,7 +378,7 @@ static void do_viodasd_request(struct request_queue *q)
                 if (req == NULL)
                         return;
                 /* check that request contains a valid command */
-                if (!blk_fs_request(req)) {
+                if (req->cmd_type != REQ_TYPE_FS) {
                         viodasd_end_request(req, -EIO, blk_rq_sectors(req));
                         continue;
                 }
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 23b7c48df843..2aafafca2b13 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -2,6 +2,7 @@
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/virtio.h>
 #include <linux/virtio_blk.h>
@@ -65,13 +66,18 @@ static void blk_done(struct virtqueue *vq)
                         break;
                 }
 
-                if (blk_pc_request(vbr->req)) {
+                switch (vbr->req->cmd_type) {
+                case REQ_TYPE_BLOCK_PC:
                         vbr->req->resid_len = vbr->in_hdr.residual;
                         vbr->req->sense_len = vbr->in_hdr.sense_len;
                         vbr->req->errors = vbr->in_hdr.errors;
-                }
-                if (blk_special_request(vbr->req))
+                        break;
+                case REQ_TYPE_SPECIAL:
                         vbr->req->errors = (error != 0);
+                        break;
+                default:
+                        break;
+                }
 
                 __blk_end_request_all(vbr->req, error);
                 list_del(&vbr->list);
@@ -94,36 +100,35 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
                 return false;
 
         vbr->req = req;
-        switch (req->cmd_type) {
-        case REQ_TYPE_FS:
-                vbr->out_hdr.type = 0;
-                vbr->out_hdr.sector = blk_rq_pos(vbr->req);
-                vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
-                break;
-        case REQ_TYPE_BLOCK_PC:
-                vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
-                vbr->out_hdr.sector = 0;
-                vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
-                break;
-        case REQ_TYPE_SPECIAL:
-                vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID;
+
+        if (req->cmd_flags & REQ_FLUSH) {
+                vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
                 vbr->out_hdr.sector = 0;
                 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
-                break;
-        case REQ_TYPE_LINUX_BLOCK:
-                if (req->cmd[0] == REQ_LB_OP_FLUSH) {
-                        vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
+        } else {
+                switch (req->cmd_type) {
+                case REQ_TYPE_FS:
+                        vbr->out_hdr.type = 0;
+                        vbr->out_hdr.sector = blk_rq_pos(vbr->req);
+                        vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
+                        break;
+                case REQ_TYPE_BLOCK_PC:
+                        vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
                         vbr->out_hdr.sector = 0;
                         vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
                         break;
+                case REQ_TYPE_SPECIAL:
+                        vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID;
+                        vbr->out_hdr.sector = 0;
+                        vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
+                        break;
+                default:
+                        /* We don't put anything else in the queue. */
+                        BUG();
                 }
-                /*FALLTHRU*/
-        default:
-                /* We don't put anything else in the queue. */
-                BUG();
         }
 
-        if (blk_barrier_rq(vbr->req))
+        if (vbr->req->cmd_flags & REQ_HARDBARRIER)
                 vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER;
 
         sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr));
@@ -134,12 +139,12 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
          * block, and before the normal inhdr we put the sense data and the
          * inhdr with additional status information before the normal inhdr.
          */
-        if (blk_pc_request(vbr->req))
+        if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC)
                 sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len);
 
         num = blk_rq_map_sg(q, vbr->req, vblk->sg + out);
 
-        if (blk_pc_request(vbr->req)) {
+        if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) {
                 sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, 96);
                 sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr,
                            sizeof(vbr->in_hdr));
@@ -190,12 +195,6 @@ static void do_virtblk_request(struct request_queue *q)
                 virtqueue_kick(vblk->vq);
 }
 
-static void virtblk_prepare_flush(struct request_queue *q, struct request *req)
-{
-        req->cmd_type = REQ_TYPE_LINUX_BLOCK;
-        req->cmd[0] = REQ_LB_OP_FLUSH;
-}
-
 /* return id (s/n) string for *disk to *id_str
  */
 static int virtblk_get_id(struct gendisk *disk, char *id_str)
@@ -219,7 +218,7 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
         return blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
 }
 
-static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
+static int virtblk_locked_ioctl(struct block_device *bdev, fmode_t mode,
                          unsigned cmd, unsigned long data)
 {
         struct gendisk *disk = bdev->bd_disk;
@@ -235,6 +234,18 @@ static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
                               (void __user *)data);
 }
 
+static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long param)
+{
+        int ret;
+
+        lock_kernel();
+        ret = virtblk_locked_ioctl(bdev, mode, cmd, param);
+        unlock_kernel();
+
+        return ret;
+}
+
 /* We provide getgeo only to please some old bootloader/partitioning tools */
 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 {
@@ -261,7 +272,7 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 }
 
 static const struct block_device_operations virtblk_fops = {
-        .locked_ioctl = virtblk_ioctl,
+        .ioctl  = virtblk_ioctl,
         .owner  = THIS_MODULE,
         .getgeo = virtblk_getgeo,
 };
@@ -383,8 +394,7 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
                  * flushing a volatile write cache on the host.  Use that
                  * to implement write barrier support.
                  */
-                blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH,
-                                  virtblk_prepare_flush);
+                blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH);
         } else if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) {
                 /*
                  * If the BARRIER feature is supported the host expects us
@@ -393,7 +403,7 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
                  * never re-orders outstanding I/O.  This feature is not
                  * useful for real life scenarious and deprecated.
                  */
-                blk_queue_ordered(q, QUEUE_ORDERED_TAG, NULL);
+                blk_queue_ordered(q, QUEUE_ORDERED_TAG);
         } else {
                 /*
                  * If the FLUSH feature is not supported we must assume that
@@ -401,7 +411,7 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
                  * caching. We still need to drain the queue to provider
                  * proper barrier semantics.
                  */
-                blk_queue_ordered(q, QUEUE_ORDERED_DRAIN, NULL);
+                blk_queue_ordered(q, QUEUE_ORDERED_DRAIN);
         }
 
         /* If disk is read-only in the host, the guest should obey */
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index 18a80ff57ce8..d5a3cd750561 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -46,6 +46,7 @@
 #include <linux/init.h>
 #include <linux/wait.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/blkpg.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -133,7 +134,7 @@ static int xd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 
 static const struct block_device_operations xd_fops = {
         .owner  = THIS_MODULE,
-        .locked_ioctl   = xd_ioctl,
+        .ioctl  = xd_ioctl,
         .getgeo = xd_getgeo,
 };
 static DECLARE_WAIT_QUEUE_HEAD(xd_wait_int);
@@ -322,7 +323,7 @@ static void do_xd_request (struct request_queue * q)
                 int res = -EIO;
                 int retry;
 
-                if (!blk_fs_request(req))
+                if (req->cmd_type != REQ_TYPE_FS)
                         goto done;
                 if (block + count > get_capacity(req->rq_disk))
                         goto done;
@@ -347,7 +348,7 @@ static int xd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 }
 
 /* xd_ioctl: handle device ioctl's */
-static int xd_ioctl(struct block_device *bdev, fmode_t mode, u_int cmd, u_long arg)
+static int xd_locked_ioctl(struct block_device *bdev, fmode_t mode, u_int cmd, u_long arg)
 {
         switch (cmd) {
                 case HDIO_SET_DMA:
@@ -375,6 +376,18 @@ static int xd_ioctl(struct block_device *bdev, fmode_t mode, u_int cmd, u_long a
         }
 }
 
+static int xd_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long param)
+{
+        int ret;
+
+        lock_kernel();
+        ret = xd_locked_ioctl(bdev, mode, cmd, param);
+        unlock_kernel();
+
+        return ret;
+}
+
 /* xd_readwrite: handle a read/write request */
 static int xd_readwrite (u_char operation,XD_INFO *p,char *buffer,u_int block,u_int count)
 {
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f63ac3d1f8a4..ac1b682edecb 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -41,6 +41,7 @@
 #include <linux/cdrom.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/scatterlist.h>
 
 #include <xen/xen.h>
@@ -79,6 +80,7 @@ static const struct block_device_operations xlvbd_block_fops;
  */
 struct blkfront_info
 {
+        struct mutex mutex;
         struct xenbus_device *xbdev;
         struct gendisk *gd;
         int vdevice;
@@ -95,16 +97,14 @@ struct blkfront_info
         unsigned long shadow_free;
         int feature_barrier;
         int is_ready;
-
-        /**
-         * The number of people holding this device open.  We won't allow a
-         * hot-unplug unless this is 0.
-         */
-        int users;
 };
 
 static DEFINE_SPINLOCK(blkif_io_lock);
 
+static unsigned int nr_minors;
+static unsigned long *minors;
+static DEFINE_SPINLOCK(minor_lock);
+
 #define MAXIMUM_OUTSTANDING_BLOCK_REQS \
         (BLKIF_MAX_SEGMENTS_PER_REQUEST * BLK_RING_SIZE)
 #define GRANT_INVALID_REF       0
@@ -139,6 +139,55 @@ static void add_id_to_freelist(struct blkfront_info *info,
         info->shadow_free = id;
 }
 
+static int xlbd_reserve_minors(unsigned int minor, unsigned int nr)
+{
+        unsigned int end = minor + nr;
+        int rc;
+
+        if (end > nr_minors) {
+                unsigned long *bitmap, *old;
+
+                bitmap = kzalloc(BITS_TO_LONGS(end) * sizeof(*bitmap),
+                                 GFP_KERNEL);
+                if (bitmap == NULL)
+                        return -ENOMEM;
+
+                spin_lock(&minor_lock);
+                if (end > nr_minors) {
+                        old = minors;
+                        memcpy(bitmap, minors,
+                               BITS_TO_LONGS(nr_minors) * sizeof(*bitmap));
+                        minors = bitmap;
+                        nr_minors = BITS_TO_LONGS(end) * BITS_PER_LONG;
+                } else
+                        old = bitmap;
+                spin_unlock(&minor_lock);
+                kfree(old);
+        }
+
+        spin_lock(&minor_lock);
+        if (find_next_bit(minors, end, minor) >= end) {
+                for (; minor < end; ++minor)
+                        __set_bit(minor, minors);
+                rc = 0;
+        } else
+                rc = -EBUSY;
+        spin_unlock(&minor_lock);
+
+        return rc;
+}
+
+static void xlbd_release_minors(unsigned int minor, unsigned int nr)
+{
+        unsigned int end = minor + nr;
+
+        BUG_ON(end > nr_minors);
+        spin_lock(&minor_lock);
+        for (; minor < end; ++minor)
+                __clear_bit(minor, minors);
+        spin_unlock(&minor_lock);
+}
+
 static void blkif_restart_queue_callback(void *arg)
 {
         struct blkfront_info *info = (struct blkfront_info *)arg;
@@ -239,7 +288,7 @@ static int blkif_queue_request(struct request *req)
 
         ring_req->operation = rq_data_dir(req) ?
                 BLKIF_OP_WRITE : BLKIF_OP_READ;
-        if (blk_barrier_rq(req))
+        if (req->cmd_flags & REQ_HARDBARRIER)
                 ring_req->operation = BLKIF_OP_WRITE_BARRIER;
 
         ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
@@ -310,7 +359,7 @@ static void do_blkif_request(struct request_queue *rq)
 
                 blk_start_request(req);
 
-                if (!blk_fs_request(req)) {
+                if (req->cmd_type != REQ_TYPE_FS) {
                         __blk_end_request_all(req, -EIO);
                         continue;
                 }
@@ -372,17 +421,22 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
 static int xlvbd_barrier(struct blkfront_info *info)
 {
         int err;
+        const char *barrier;
 
-        err = blk_queue_ordered(info->rq,
-                                info->feature_barrier ? QUEUE_ORDERED_DRAIN : QUEUE_ORDERED_NONE,
-                                NULL);
+        switch (info->feature_barrier) {
+        case QUEUE_ORDERED_DRAIN:       barrier = "enabled (drain)"; break;
+        case QUEUE_ORDERED_TAG:         barrier = "enabled (tag)"; break;
+        case QUEUE_ORDERED_NONE:        barrier = "disabled"; break;
+        default:                        return -EINVAL;
+        }
+
+        err = blk_queue_ordered(info->rq, info->feature_barrier);
 
         if (err)
                 return err;
 
         printk(KERN_INFO "blkfront: %s: barriers %s\n",
-               info->gd->disk_name,
-               info->feature_barrier ? "enabled" : "disabled");
+               info->gd->disk_name, barrier);
         return 0;
 }
 
@@ -418,9 +472,14 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
         if ((minor % nr_parts) == 0)
                 nr_minors = nr_parts;
 
+        err = xlbd_reserve_minors(minor, nr_minors);
+        if (err)
+                goto out;
+        err = -ENODEV;
+
         gd = alloc_disk(nr_minors);
         if (gd == NULL)
-                goto out;
+                goto release;
 
         offset = minor / nr_parts;
 
@@ -451,14 +510,13 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
 
         if (xlvbd_init_blk_queue(gd, sector_size)) {
                 del_gendisk(gd);
-                goto out;
+                goto release;
         }
 
         info->rq = gd->queue;
         info->gd = gd;
 
-        if (info->feature_barrier)
-                xlvbd_barrier(info);
+        xlvbd_barrier(info);
 
         if (vdisk_info & VDISK_READONLY)
                 set_disk_ro(gd, 1);
@@ -471,10 +529,45 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
 
         return 0;
 
+ release:
+        xlbd_release_minors(minor, nr_minors);
  out:
         return err;
 }
 
+static void xlvbd_release_gendisk(struct blkfront_info *info)
+{
+        unsigned int minor, nr_minors;
+        unsigned long flags;
+
+        if (info->rq == NULL)
+                return;
+
+        spin_lock_irqsave(&blkif_io_lock, flags);
+
+        /* No more blkif_request(). */
+        blk_stop_queue(info->rq);
+
+        /* No more gnttab callback work. */
+        gnttab_cancel_free_callback(&info->callback);
+        spin_unlock_irqrestore(&blkif_io_lock, flags);
+
+        /* Flush gnttab callback work. Must be done with no locks held. */
+        flush_scheduled_work();
+
+        del_gendisk(info->gd);
+
+        minor = info->gd->first_minor;
+        nr_minors = info->gd->minors;
+        xlbd_release_minors(minor, nr_minors);
+
+        blk_cleanup_queue(info->rq);
+        info->rq = NULL;
+
+        put_disk(info->gd);
+        info->gd = NULL;
+}
+
 static void kick_pending_request_queues(struct blkfront_info *info)
 {
         if (!RING_FULL(&info->ring)) {
@@ -569,7 +662,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
                                 printk(KERN_WARNING "blkfront: %s: write barrier op failed\n",
                                        info->gd->disk_name);
                                 error = -EOPNOTSUPP;
-                                info->feature_barrier = 0;
+                                info->feature_barrier = QUEUE_ORDERED_NONE;
                                 xlvbd_barrier(info);
                         }
                         /* fall through */
@@ -652,7 +745,7 @@ fail:
 
 
 /* Common code used when first setting up, and when resuming. */
-static int talk_to_backend(struct xenbus_device *dev,
+static int talk_to_blkback(struct xenbus_device *dev,
                            struct blkfront_info *info)
 {
         const char *message = NULL;
@@ -712,7 +805,6 @@ again:
         return err;
 }
 
-
 /**
  * Entry point to this code when a new device is created.  Allocate the basic
  * structures and the ring buffer for communication with the backend, and
@@ -773,6 +865,7 @@ static int blkfront_probe(struct xenbus_device *dev,
                 return -ENOMEM;
         }
 
+        mutex_init(&info->mutex);
         info->xbdev = dev;
         info->vdevice = vdevice;
         info->connected = BLKIF_STATE_DISCONNECTED;
@@ -786,7 +879,7 @@ static int blkfront_probe(struct xenbus_device *dev,
         info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
         dev_set_drvdata(&dev->dev, info);
 
-        err = talk_to_backend(dev, info);
+        err = talk_to_blkback(dev, info);
         if (err) {
                 kfree(info);
                 dev_set_drvdata(&dev->dev, NULL);
@@ -881,13 +974,50 @@ static int blkfront_resume(struct xenbus_device *dev)
 
         blkif_free(info, info->connected == BLKIF_STATE_CONNECTED);
 
-        err = talk_to_backend(dev, info);
+        err = talk_to_blkback(dev, info);
         if (info->connected == BLKIF_STATE_SUSPENDED && !err)
                 err = blkif_recover(info);
 
         return err;
 }
 
+static void
+blkfront_closing(struct blkfront_info *info)
+{
+        struct xenbus_device *xbdev = info->xbdev;
+        struct block_device *bdev = NULL;
+
+        mutex_lock(&info->mutex);
+
+        if (xbdev->state == XenbusStateClosing) {
+                mutex_unlock(&info->mutex);
+                return;
+        }
+
+        if (info->gd)
+                bdev = bdget_disk(info->gd, 0);
+
+        mutex_unlock(&info->mutex);
+
+        if (!bdev) {
+                xenbus_frontend_closed(xbdev);
+                return;
+        }
+
+        mutex_lock(&bdev->bd_mutex);
+
+        if (bdev->bd_openers) {
+                xenbus_dev_error(xbdev, -EBUSY,
+                                 "Device in use; refusing to close");
+                xenbus_switch_state(xbdev, XenbusStateClosing);
+        } else {
+                xlvbd_release_gendisk(info);
+                xenbus_frontend_closed(xbdev);
+        }
+
+        mutex_unlock(&bdev->bd_mutex);
+        bdput(bdev);
+}
 
 /*
  * Invoked when the backend is finally 'ready' (and has told produced
@@ -899,11 +1029,31 @@ static void blkfront_connect(struct blkfront_info *info)
         unsigned long sector_size;
         unsigned int binfo;
         int err;
-
-        if ((info->connected == BLKIF_STATE_CONNECTED) ||
-            (info->connected == BLKIF_STATE_SUSPENDED) )
+        int barrier;
+
+        switch (info->connected) {
+        case BLKIF_STATE_CONNECTED:
+                /*
+                 * Potentially, the back-end may be signalling
+                 * a capacity change; update the capacity.
+                 */
+                err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+                                   "sectors", "%Lu", &sectors);
+                if (XENBUS_EXIST_ERR(err))
+                        return;
+                printk(KERN_INFO "Setting capacity to %Lu\n",
+                       sectors);
+                set_capacity(info->gd, sectors);
+                revalidate_disk(info->gd);
+
+                /* fall through */
+        case BLKIF_STATE_SUSPENDED:
                 return;
 
+        default:
+                break;
+        }
+
         dev_dbg(&info->xbdev->dev, "%s:%s.\n",
                 __func__, info->xbdev->otherend);
 
@@ -920,10 +1070,26 @@ static void blkfront_connect(struct blkfront_info *info)
         }
 
         err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
-                            "feature-barrier", "%lu", &info->feature_barrier,
+                            "feature-barrier", "%lu", &barrier,
                             NULL);
+
+        /*
+         * If there's no "feature-barrier" defined, then it means
+         * we're dealing with a very old backend which writes
+         * synchronously; draining will do what needs to get done.
+         *
+         * If there are barriers, then we can do full queued writes
+         * with tagged barriers.
+         *
+         * If barriers are not supported, then there's no much we can
+         * do, so just set ordering to NONE.
+         */
         if (err)
-                info->feature_barrier = 0;
+                info->feature_barrier = QUEUE_ORDERED_DRAIN;
+        else if (barrier)
+                info->feature_barrier = QUEUE_ORDERED_TAG;
+        else
+                info->feature_barrier = QUEUE_ORDERED_NONE;
 
         err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
         if (err) {
@@ -946,52 +1112,14 @@ static void blkfront_connect(struct blkfront_info *info)
 }
 
 /**
- * Handle the change of state of the backend to Closing.  We must delete our
- * device-layer structures now, to ensure that writes are flushed through to
- * the backend.  Once is this done, we can switch to Closed in
- * acknowledgement.
- */
-static void blkfront_closing(struct xenbus_device *dev)
-{
-        struct blkfront_info *info = dev_get_drvdata(&dev->dev);
-        unsigned long flags;
-
-        dev_dbg(&dev->dev, "blkfront_closing: %s removed\n", dev->nodename);
-
-        if (info->rq == NULL)
-                goto out;
-
-        spin_lock_irqsave(&blkif_io_lock, flags);
-
-        /* No more blkif_request(). */
-        blk_stop_queue(info->rq);
-
-        /* No more gnttab callback work. */
-        gnttab_cancel_free_callback(&info->callback);
-        spin_unlock_irqrestore(&blkif_io_lock, flags);
-
-        /* Flush gnttab callback work. Must be done with no locks held. */
-        flush_scheduled_work();
-
-        blk_cleanup_queue(info->rq);
-        info->rq = NULL;
-
-        del_gendisk(info->gd);
-
- out:
-        xenbus_frontend_closed(dev);
-}
-
-/**
  * Callback received when the backend's state changes.
  */
-static void backend_changed(struct xenbus_device *dev,
+static void blkback_changed(struct xenbus_device *dev,
                             enum xenbus_state backend_state)
 {
         struct blkfront_info *info = dev_get_drvdata(&dev->dev);
-        struct block_device *bd;
 
-        dev_dbg(&dev->dev, "blkfront:backend_changed.\n");
+        dev_dbg(&dev->dev, "blkfront:blkback_changed to state %d.\n", backend_state);
 
         switch (backend_state) {
         case XenbusStateInitialising:
@@ -1006,35 +1134,56 @@ static void backend_changed(struct xenbus_device *dev,
                 break;
 
         case XenbusStateClosing:
-                if (info->gd == NULL) {
-                        xenbus_frontend_closed(dev);
-                        break;
-                }
-                bd = bdget_disk(info->gd, 0);
-                if (bd == NULL)
-                        xenbus_dev_fatal(dev, -ENODEV, "bdget failed");
-
-                mutex_lock(&bd->bd_mutex);
-                if (info->users > 0)
-                        xenbus_dev_error(dev, -EBUSY,
-                                         "Device in use; refusing to close");
-                else
-                        blkfront_closing(dev);
-                mutex_unlock(&bd->bd_mutex);
-                bdput(bd);
+                blkfront_closing(info);
                 break;
         }
 }
 
-static int blkfront_remove(struct xenbus_device *dev)
+static int blkfront_remove(struct xenbus_device *xbdev)
 {
-        struct blkfront_info *info = dev_get_drvdata(&dev->dev);
+        struct blkfront_info *info = dev_get_drvdata(&xbdev->dev);
+        struct block_device *bdev = NULL;
+        struct gendisk *disk;
 
-        dev_dbg(&dev->dev, "blkfront_remove: %s removed\n", dev->nodename);
+        dev_dbg(&xbdev->dev, "%s removed", xbdev->nodename);
 
         blkif_free(info, 0);
 
-        kfree(info);
+        mutex_lock(&info->mutex);
+
+        disk = info->gd;
+        if (disk)
+                bdev = bdget_disk(disk, 0);
+
+        info->xbdev = NULL;
+        mutex_unlock(&info->mutex);
+
+        if (!bdev) {
+                kfree(info);
+                return 0;
+        }
+
+        /*
+         * The xbdev was removed before we reached the Closed
+         * state. See if it's safe to remove the disk. If the bdev
+         * isn't closed yet, we let release take care of it.
+         */
+
+        mutex_lock(&bdev->bd_mutex);
+        info = disk->private_data;
+
+        dev_warn(disk_to_dev(disk),
+                 "%s was hot-unplugged, %d stale handles\n",
+                 xbdev->nodename, bdev->bd_openers);
+
+        if (info && !bdev->bd_openers) {
+                xlvbd_release_gendisk(info);
+                disk->private_data = NULL;
+                kfree(info);
+        }
+
+        mutex_unlock(&bdev->bd_mutex);
+        bdput(bdev);
 
         return 0;
 }
@@ -1043,30 +1192,78 @@ static int blkfront_is_ready(struct xenbus_device *dev)
 {
         struct blkfront_info *info = dev_get_drvdata(&dev->dev);
 
-        return info->is_ready;
+        return info->is_ready && info->xbdev;
 }
 
 static int blkif_open(struct block_device *bdev, fmode_t mode)
 {
-        struct blkfront_info *info = bdev->bd_disk->private_data;
-        info->users++;
-        return 0;
+        struct gendisk *disk = bdev->bd_disk;
+        struct blkfront_info *info;
+        int err = 0;
+
+        lock_kernel();
+
+        info = disk->private_data;
+        if (!info) {
+                /* xbdev gone */
+                err = -ERESTARTSYS;
+                goto out;
+        }
+
+        mutex_lock(&info->mutex);
+
+        if (!info->gd)
+                /* xbdev is closed */
+                err = -ERESTARTSYS;
+
+        mutex_unlock(&info->mutex);
+
+out:
+        unlock_kernel();
+        return err;
 }
 
 static int blkif_release(struct gendisk *disk, fmode_t mode)
 {
         struct blkfront_info *info = disk->private_data;
-        info->users--;
-        if (info->users == 0) {
-                /* Check whether we have been instructed to close.  We will
-                   have ignored this request initially, as the device was
-                   still mounted. */
-                struct xenbus_device *dev = info->xbdev;
-                enum xenbus_state state = xenbus_read_driver_state(dev->otherend);
-
-                if (state == XenbusStateClosing && info->is_ready)
-                        blkfront_closing(dev);
+        struct block_device *bdev;
+        struct xenbus_device *xbdev;
+
+        lock_kernel();
+
+        bdev = bdget_disk(disk, 0);
+        bdput(bdev);
+
+        if (bdev->bd_openers)
+                goto out;
+
+        /*
+         * Check if we have been instructed to close. We will have
+         * deferred this request, because the bdev was still open.
+         */
+
+        mutex_lock(&info->mutex);
+        xbdev = info->xbdev;
+
+        if (xbdev && xbdev->state == XenbusStateClosing) {
+                /* pending switch to state closed */
+                dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
+                xlvbd_release_gendisk(info);
+                xenbus_frontend_closed(info->xbdev);
+        }
+
+        mutex_unlock(&info->mutex);
+
+        if (!xbdev) {
+                /* sudden device removal */
+                dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
+                xlvbd_release_gendisk(info);
+                disk->private_data = NULL;
+                kfree(info);
         }
+
+out:
+        unlock_kernel();
         return 0;
 }
 
@@ -1076,7 +1273,7 @@ static const struct block_device_operations xlvbd_block_fops =
         .open = blkif_open,
         .release = blkif_release,
         .getgeo = blkif_getgeo,
-        .locked_ioctl = blkif_ioctl,
+        .ioctl = blkif_ioctl,
 };
 
 
@@ -1092,7 +1289,7 @@ static struct xenbus_driver blkfront = {
         .probe = blkfront_probe,
         .remove = blkfront_remove,
         .resume = blkfront_resume,
-        .otherend_changed = backend_changed,
+        .otherend_changed = blkback_changed,
         .is_ready = blkfront_is_ready,
 };
 
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index a7b83c0a7eb5..b71888b909a0 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -89,6 +89,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/ata.h>
 #include <linux/hdreg.h>
 #include <linux/platform_device.h>
@@ -465,7 +466,7 @@ struct request *ace_get_next_request(struct request_queue * q)
         struct request *req;
 
         while ((req = blk_peek_request(q)) != NULL) {
-                if (blk_fs_request(req))
+                if (req->cmd_type == REQ_TYPE_FS)
                         break;
                 blk_start_request(req);
                 __blk_end_request_all(req, -EIO);
@@ -901,11 +902,14 @@ static int ace_open(struct block_device *bdev, fmode_t mode)
 
         dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
 
+        lock_kernel();
         spin_lock_irqsave(&ace->lock, flags);
         ace->users++;
         spin_unlock_irqrestore(&ace->lock, flags);
 
         check_disk_change(bdev);
+        unlock_kernel();
+
         return 0;
 }
 
@@ -917,6 +921,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
 
         dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
 
+        lock_kernel();
         spin_lock_irqsave(&ace->lock, flags);
         ace->users--;
         if (ace->users == 0) {
@@ -924,6 +929,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
                 ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
         }
         spin_unlock_irqrestore(&ace->lock, flags);
+        unlock_kernel();
         return 0;
 }
 
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index 9114654b54d9..d75b2bb601ad 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -33,6 +33,7 @@
 #include <linux/module.h>
 #include <linux/blkdev.h>
 #include <linux/bitops.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 
 #include <asm/setup.h>
@@ -153,6 +154,7 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
 
     device = MINOR(bdev->bd_dev);
 
+    lock_kernel();
     if ( current_device != -1 && current_device != device )
     {
         rc = -EBUSY;
@@ -294,20 +296,25 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
         set_capacity(z2ram_gendisk, z2ram_size >> 9);
     }
 
+    unlock_kernel();
     return 0;
 
 err_out_kfree:
     kfree(z2ram_map);
 err_out:
+    unlock_kernel();
     return rc;
 }
 
 static int
 z2_release(struct gendisk *disk, fmode_t mode)
 {
-    if ( current_device == -1 )
-        return 0;     
-
+    lock_kernel();
+    if ( current_device == -1 ) {
+        unlock_kernel();
+        return 0;
+    }
+    unlock_kernel();
     /*
      * FIXME: unmap memory
      */
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index e3749d0ba68b..af13c62dc473 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -242,6 +242,8 @@
 
 -------------------------------------------------------------------------*/
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #define REVISION "Revision: 3.20"
 #define VERSION "Id: cdrom.c 3.20 2003/12/17"
 
@@ -314,11 +316,17 @@ static const char *mrw_format_status[] = {
 static const char *mrw_address_space[] = { "DMA", "GAA" };
 
 #if (ERRLOGMASK!=CD_NOTHING)
-#define cdinfo(type, fmt, args...) \
-        if ((ERRLOGMASK & type) || debug==1 ) \
-            printk(KERN_INFO "cdrom: " fmt, ## args)
+#define cdinfo(type, fmt, args...)                      \
+do {                                                    \
+        if ((ERRLOGMASK & type) || debug == 1)          \
+                pr_info(fmt, ##args);                   \
+} while (0)
 #else
-#define cdinfo(type, fmt, args...) 
+#define cdinfo(type, fmt, args...)                      \
+do {                                                    \
+        if (0 && (ERRLOGMASK & type) || debug == 1)     \
+                pr_info(fmt, ##args);                   \
+} while (0)
 #endif
 
 /* These are used to simplify getting data in from and back to user land */
@@ -395,7 +403,7 @@ int register_cdrom(struct cdrom_device_info *cdi)
         if (cdo->open == NULL || cdo->release == NULL)
                 return -EINVAL;
         if (!banner_printed) {
-                printk(KERN_INFO "Uniform CD-ROM driver " REVISION "\n");
+                pr_info("Uniform CD-ROM driver " REVISION "\n");
                 banner_printed = 1;
                 cdrom_sysctl_register();
         }
@@ -546,7 +554,7 @@ static int cdrom_mrw_bgformat(struct cdrom_device_info *cdi, int cont)
         unsigned char buffer[12];
         int ret;
 
-        printk(KERN_INFO "cdrom: %sstarting format\n", cont ? "Re" : "");
+        pr_info("%sstarting format\n", cont ? "Re" : "");
 
         /*
          * FmtData bit set (bit 4), format type is 1
@@ -576,7 +584,7 @@ static int cdrom_mrw_bgformat(struct cdrom_device_info *cdi, int cont)
 
         ret = cdi->ops->generic_packet(cdi, &cgc);
         if (ret)
-                printk(KERN_INFO "cdrom: bgformat failed\n");
+                pr_info("bgformat failed\n");
 
         return ret;
 }
@@ -622,8 +630,7 @@ static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
 
         ret = 0;
         if (di.mrw_status == CDM_MRW_BGFORMAT_ACTIVE) {
-                printk(KERN_INFO "cdrom: issuing MRW back ground "
-                                "format suspend\n");
+                pr_info("issuing MRW background format suspend\n");
                 ret = cdrom_mrw_bgformat_susp(cdi, 0);
         }
 
@@ -658,7 +665,8 @@ static int cdrom_mrw_set_lba_space(struct cdrom_device_info *cdi, int space)
         if ((ret = cdrom_mode_select(cdi, &cgc)))
                 return ret;
 
-        printk(KERN_INFO "cdrom: %s: mrw address space %s selected\n", cdi->name, mrw_address_space[space]);
+        pr_info("%s: mrw address space %s selected\n",
+                cdi->name, mrw_address_space[space]);
         return 0;
 }
 
@@ -762,7 +770,7 @@ static int cdrom_mrw_open_write(struct cdrom_device_info *cdi)
          * always reset to DMA lba space on open
          */
         if (cdrom_mrw_set_lba_space(cdi, MRW_LBA_DMA)) {
-                printk(KERN_ERR "cdrom: failed setting lba address space\n");
+                pr_err("failed setting lba address space\n");
                 return 1;
         }
 
@@ -781,8 +789,7 @@ static int cdrom_mrw_open_write(struct cdrom_device_info *cdi)
          * 3    -       MRW formatting complete
          */
         ret = 0;
-        printk(KERN_INFO "cdrom open: mrw_status '%s'\n",
-                        mrw_format_status[di.mrw_status]);
+        pr_info("open: mrw_status '%s'\n", mrw_format_status[di.mrw_status]);
         if (!di.mrw_status)
                 ret = 1;
         else if (di.mrw_status == CDM_MRW_BGFORMAT_INACTIVE &&
@@ -932,8 +939,7 @@ static void cdrom_dvd_rw_close_write(struct cdrom_device_info *cdi)
                 return;
         }
 
-        printk(KERN_INFO "cdrom: %s: dirty DVD+RW media, \"finalizing\"\n",
-               cdi->name);
+        pr_info("%s: dirty DVD+RW media, \"finalizing\"\n", cdi->name);
 
         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
         cgc.cmd[0] = GPCMD_FLUSH_CACHE;
@@ -2176,7 +2182,7 @@ retry:
          * frame dma, so drop to single frame dma if we need to
          */
         if (cdi->cdda_method == CDDA_BPC_FULL && nframes > 1) {
-                printk("cdrom: dropping to single frame dma\n");
+                pr_info("dropping to single frame dma\n");
                 cdi->cdda_method = CDDA_BPC_SINGLE;
                 goto retry;
         }
@@ -2189,7 +2195,7 @@ retry:
         if (cdi->last_sense != 0x04 && cdi->last_sense != 0x0b)
                 return ret;
 
-        printk("cdrom: dropping to old style cdda (sense=%x)\n", cdi->last_sense);
+        pr_info("dropping to old style cdda (sense=%x)\n", cdi->last_sense);
         cdi->cdda_method = CDDA_OLD;
         return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);    
 }
@@ -3401,7 +3407,7 @@ static int cdrom_print_info(const char *header, int val, char *info,
                                         "\t%d", CDROM_CAN(val) != 0);
                         break;
                 default:
-                        printk(KERN_INFO "cdrom: invalid option%d\n", option);
+                        pr_info("invalid option%d\n", option);
                         return 1;
                 }
                 if (!ret)
@@ -3491,7 +3497,7 @@ doit:
         mutex_unlock(&cdrom_mutex);
         return proc_dostring(ctl, write, buffer, lenp, ppos);
 done:
-        printk(KERN_INFO "cdrom: info buffer too small\n");
+        pr_info("info buffer too small\n");
         goto doit;
 }
 
@@ -3665,7 +3671,7 @@ static int __init cdrom_init(void)
 
 static void __exit cdrom_exit(void)
 {
-        printk(KERN_INFO "Uniform CD-ROM driver unloaded\n");
+        pr_info("Uniform CD-ROM driver unloaded\n");
         cdrom_sysctl_unregister();
 }
 
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index 03c71f7698cb..261107d1457c 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -19,6 +19,8 @@
  *
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/fs.h>
@@ -32,6 +34,7 @@
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
+#include <linux/smp_lock.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
 #include <linux/platform_device.h>
@@ -339,8 +342,7 @@ static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
                 tocuse = 0;
                 err = gdrom_readtoc_cmd(gd.toc, 0);
                 if (err) {
-                        printk(KERN_INFO "GDROM: Could not get CD "
-                                "table of contents\n");
+                        pr_info("Could not get CD table of contents\n");
                         return -ENXIO;
                 }
         }
@@ -357,8 +359,7 @@ static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
         } while (track >= fentry);
 
         if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
-                printk(KERN_INFO "GDROM: No data on the last "
-                        "session of the CD\n");
+                pr_info("No data on the last session of the CD\n");
                 gdrom_getsense(NULL);
                 return -ENXIO;
         }
@@ -451,14 +452,14 @@ static int gdrom_getsense(short *bufstring)
                 goto cleanup_sense;
         insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
         if (sense[1] & 40) {
-                printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+                pr_info("Drive not ready - command aborted\n");
                 goto cleanup_sense;
         }
         sense_key = sense[1] & 0x0F;
         if (sense_key < ARRAY_SIZE(sense_texts))
-                printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+                pr_info("%s\n", sense_texts[sense_key].text);
         else
-                printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+                pr_err("Unknown sense key: %d\n", sense_key);
         if (bufstring) /* return addional sense data */
                 memcpy(bufstring, &sense[4], 2);
         if (sense_key < 2)
@@ -492,12 +493,18 @@ static struct cdrom_device_ops gdrom_ops = {
 
 static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
 {
-        return cdrom_open(gd.cd_info, bdev, mode);
+        int ret;
+        lock_kernel();
+        ret = cdrom_open(gd.cd_info, bdev, mode);
+        unlock_kernel();
+        return ret;
 }
 
 static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
 {
+        lock_kernel();
         cdrom_release(gd.cd_info, mode);
+        unlock_kernel();
         return 0;
 }
 
@@ -509,7 +516,13 @@ static int gdrom_bdops_mediachanged(struct gendisk *disk)
 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
         unsigned cmd, unsigned long arg)
 {
-        return cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
+        int ret;
+
+        lock_kernel();
+        ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
+        unlock_kernel();
+
+        return ret;
 }
 
 static const struct block_device_operations gdrom_bdops = {
@@ -517,7 +530,7 @@ static const struct block_device_operations gdrom_bdops = {
         .open                   = gdrom_bdops_open,
         .release                = gdrom_bdops_release,
         .media_changed          = gdrom_bdops_mediachanged,
-        .locked_ioctl           = gdrom_bdops_ioctl,
+        .ioctl                  = gdrom_bdops_ioctl,
 };
 
 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
@@ -643,14 +656,13 @@ static void gdrom_request(struct request_queue *rq)
         struct request *req;
 
         while ((req = blk_fetch_request(rq)) != NULL) {
-                if (!blk_fs_request(req)) {
-                        printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+                if (req->cmd_type != REQ_TYPE_FS) {
+                        printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
                         __blk_end_request_all(req, -EIO);
                         continue;
                 }
                 if (rq_data_dir(req) != READ) {
-                        printk(KERN_NOTICE "GDROM: Read only device -");
-                        printk(" write request ignored\n");
+                        pr_notice("Read only device - write request ignored\n");
                         __blk_end_request_all(req, -EIO);
                         continue;
                 }
@@ -685,7 +697,7 @@ static int __devinit gdrom_outputversion(void)
         firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
         if (!firmw_ver)
                 goto free_manuf_name;
-        printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
+        pr_info("%s from %s with firmware %s\n",
                 model_name, manuf_name, firmw_ver);
         err = 0;
         kfree(firmw_ver);
@@ -757,7 +769,7 @@ static int __devinit probe_gdrom(struct platform_device *devptr)
         int err;
         /* Start the device */
         if (gdrom_execute_diagnostic() != 1) {
-                printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+                pr_warning("ATA Probe for GDROM failed\n");
                 return -ENODEV;
         }
         /* Print out firmware ID */
@@ -767,7 +779,7 @@ static int __devinit probe_gdrom(struct platform_device *devptr)
         gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
         if (gdrom_major <= 0)
                 return gdrom_major;
-        printk(KERN_INFO "GDROM: Registered with major number %d\n",
+        pr_info("Registered with major number %d\n",
                 gdrom_major);
         /* Specify basic properties of drive */
         gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
@@ -818,7 +830,7 @@ probe_fail_no_disk:
         unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
         gdrom_major = 0;
 probe_fail_no_mem:
-        printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
+        pr_warning("Probe failed - error is 0x%X\n", err);
         return err;
 }
 
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index 451cd7071b1d..56bf9f44700c 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -31,6 +31,8 @@
  * the OS/400 partition.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/major.h>
 #include <linux/blkdev.h>
 #include <linux/cdrom.h>
@@ -40,6 +42,7 @@
 #include <linux/module.h>
 #include <linux/completion.h>
 #include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
 #include <linux/seq_file.h>
 #include <linux/scatterlist.h>
 
@@ -53,9 +56,6 @@
 
 #define VIOCD_VERS "1.06"
 
-#define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
-#define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
-
 /*
  * Should probably make this a module parameter....sigh
  */
@@ -154,13 +154,21 @@ static const struct file_operations proc_viocd_operations = {
 static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 {
         struct disk_info *di = bdev->bd_disk->private_data;
-        return cdrom_open(&di->viocd_info, bdev, mode);
+        int ret;
+
+        lock_kernel();
+        ret = cdrom_open(&di->viocd_info, bdev, mode);
+        unlock_kernel();
+
+        return ret;
 }
 
 static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 {
         struct disk_info *di = disk->private_data;
+        lock_kernel();
         cdrom_release(&di->viocd_info, mode);
+        unlock_kernel();
         return 0;
 }
 
@@ -168,7 +176,13 @@ static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
                 unsigned cmd, unsigned long arg)
 {
         struct disk_info *di = bdev->bd_disk->private_data;
-        return cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
+        int ret;
+
+        lock_kernel();
+        ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
+        unlock_kernel();
+
+        return ret;
 }
 
 static int viocd_blk_media_changed(struct gendisk *disk)
@@ -181,7 +195,7 @@ static const struct block_device_operations viocd_fops = {
         .owner =                THIS_MODULE,
         .open =                 viocd_blk_open,
         .release =              viocd_blk_release,
-        .locked_ioctl =         viocd_blk_ioctl,
+        .ioctl =                viocd_blk_ioctl,
         .media_changed =        viocd_blk_media_changed,
 };
 
@@ -202,9 +216,8 @@ static int viocd_open(struct cdrom_device_info *cdi, int purpose)
                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
                         0, 0, 0);
         if (hvrc != 0) {
-                printk(VIOCD_KERN_WARNING
-                                "bad rc on HvCallEvent_signalLpEventFast %d\n",
-                                (int)hvrc);
+                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
+                           (int)hvrc);
                 return -EIO;
         }
 
@@ -213,8 +226,8 @@ static int viocd_open(struct cdrom_device_info *cdi, int purpose)
         if (we.rc) {
                 const struct vio_error_entry *err =
                         vio_lookup_rc(viocd_err_table, we.sub_result);
-                printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
-                                we.rc, we.sub_result, err->msg);
+                pr_warning("bad rc %d:0x%04X on open: %s\n",
+                           we.rc, we.sub_result, err->msg);
                 return -err->errno;
         }
 
@@ -234,9 +247,8 @@ static void viocd_release(struct cdrom_device_info *cdi)
                         viopath_targetinst(viopath_hostLp), 0,
                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
         if (hvrc != 0)
-                printk(VIOCD_KERN_WARNING
-                                "bad rc on HvCallEvent_signalLpEventFast %d\n",
-                                (int)hvrc);
+                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
+                           (int)hvrc);
 }
 
 /* Send a read or write request to OS/400 */
@@ -262,13 +274,12 @@ static int send_request(struct request *req)
 
         sg_init_table(&sg, 1);
         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
-                printk(VIOCD_KERN_WARNING
-                                "error setting up scatter/gather list\n");
+                pr_warning("error setting up scatter/gather list\n");
                 return -1;
         }
 
         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
-                printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
+                pr_warning("error allocating sg tce\n");
                 return -1;
         }
         dmaaddr = sg_dma_address(&sg);
@@ -284,7 +295,7 @@ static int send_request(struct request *req)
                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
                         (u64)blk_rq_pos(req) * 512, len, 0);
         if (hvrc != HvLpEvent_Rc_Good) {
-                printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
+                pr_warning("hv error on op %d\n", (int)hvrc);
                 return -1;
         }
 
@@ -298,11 +309,10 @@ static void do_viocd_request(struct request_queue *q)
         struct request *req;
 
         while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
-                if (!blk_fs_request(req))
+                if (req->cmd_type != REQ_TYPE_FS)
                         __blk_end_request_all(req, -EIO);
                 else if (send_request(req) < 0) {
-                        printk(VIOCD_KERN_WARNING
-                                        "unable to send message to OS/400!");
+                        pr_warning("unable to send message to OS/400!\n");
                         __blk_end_request_all(req, -EIO);
                 } else
                         rwreq++;
@@ -327,8 +337,8 @@ static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
                         0, 0, 0);
         if (hvrc != 0) {
-                printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
-                                (int)hvrc);
+                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
+                           (int)hvrc);
                 return -EIO;
         }
 
@@ -338,9 +348,8 @@ static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
         if (we.rc) {
                 const struct vio_error_entry *err =
                         vio_lookup_rc(viocd_err_table, we.sub_result);
-                printk(VIOCD_KERN_WARNING
-                                "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
-                                we.rc, we.sub_result, err->msg);
+                pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
+                           we.rc, we.sub_result, err->msg);
                 return 0;
         }
 
@@ -367,8 +376,8 @@ static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
                         (u64)&we, VIOVERSION << 16,
                         (device_no << 48) | (flags << 32), 0, 0, 0);
         if (hvrc != 0) {
-                printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
-                                (int)hvrc);
+                pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
+                           (int)hvrc);
                 return -EIO;
         }
 
@@ -455,8 +464,7 @@ static void vio_handle_cd_event(struct HvLpEvent *event)
                 return;
         /* First, we should NEVER get an int here...only acks */
         if (hvlpevent_is_int(event)) {
-                printk(VIOCD_KERN_WARNING
-                                "Yikes! got an int in viocd event handler!\n");
+                pr_warning("Yikes! got an int in viocd event handler!\n");
                 if (hvlpevent_need_ack(event)) {
                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
                         HvCallEvent_ackLpEvent(event);
@@ -510,10 +518,9 @@ return_complete:
                         const struct vio_error_entry *err =
                                 vio_lookup_rc(viocd_err_table,
                                                 bevent->sub_result);
-                        printk(VIOCD_KERN_WARNING "request %p failed "
-                                        "with rc %d:0x%04X: %s\n",
-                                        req, event->xRc,
-                                        bevent->sub_result, err->msg);
+                        pr_warning("request %p failed with rc %d:0x%04X: %s\n",
+                                   req, event->xRc,
+                                   bevent->sub_result, err->msg);
                         __blk_end_request_all(req, -EIO);
                 } else
                         __blk_end_request_all(req, 0);
@@ -524,9 +531,8 @@ return_complete:
                 break;
 
         default:
-                printk(VIOCD_KERN_WARNING
-                                "message with invalid subtype %0x04X!\n",
-                                event->xSubtype & VIOMINOR_SUBTYPE_MASK);
+                pr_warning("message with invalid subtype %0x04X!\n",
+                           event->xSubtype & VIOMINOR_SUBTYPE_MASK);
                 if (hvlpevent_need_ack(event)) {
                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
                         HvCallEvent_ackLpEvent(event);
@@ -593,23 +599,19 @@ static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 
         if (register_cdrom(c) != 0) {
-                printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
-                                c->name);
+                pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
                 goto out;
         }
-        printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
-                        "type %4.4s, model %3.3s\n",
-                        c->name, d->rsrcname, d->type, d->model);
+        pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
+                c->name, d->rsrcname, d->type, d->model);
         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
         if (q == NULL) {
-                printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
-                                c->name);
+                pr_warning("Cannot allocate queue for %s!\n", c->name);
                 goto out_unregister_cdrom;
         }
         gendisk = alloc_disk(1);
         if (gendisk == NULL) {
-                printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
-                                c->name);
+                pr_warning("Cannot create gendisk for %s!\n", c->name);
                 goto out_cleanup_queue;
         }
         gendisk->major = VIOCD_MAJOR;
@@ -682,21 +684,19 @@ static int __init viocd_init(void)
                         return -ENODEV;
         }
 
-        printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
-                        viopath_hostLp);
+        pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
 
         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
-                printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
-                                VIOCD_MAJOR, VIOCD_DEVICE);
+                pr_warning("Unable to get major %d for %s\n",
+                           VIOCD_MAJOR, VIOCD_DEVICE);
                 return -EIO;
         }
 
         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
                         MAX_CD_REQ + 2);
         if (ret) {
-                printk(VIOCD_KERN_WARNING
-                                "error opening path to host partition %d\n",
-                                viopath_hostLp);
+                pr_warning("error opening path to host partition %d\n",
+                           viopath_hostLp);
                 goto out_unregister;
         }
 
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index f9daffd7d0e3..e88a2cf17711 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -190,7 +190,7 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
 
         BUG_ON(sense_len > sizeof(*sense));
 
-        if (blk_sense_request(rq) || drive->sense_rq_armed)
+        if (rq->cmd_type == REQ_TYPE_SENSE || drive->sense_rq_armed)
                 return;
 
         memset(sense, 0, sizeof(*sense));
@@ -307,13 +307,16 @@ EXPORT_SYMBOL_GPL(ide_cd_expiry);
 
 int ide_cd_get_xferlen(struct request *rq)
 {
-        if (blk_fs_request(rq))
+        switch (rq->cmd_type) {
+        case REQ_TYPE_FS:
                 return 32768;
-        else if (blk_sense_request(rq) || blk_pc_request(rq) ||
-                         rq->cmd_type == REQ_TYPE_ATA_PC)
+        case REQ_TYPE_SENSE:
+        case REQ_TYPE_BLOCK_PC:
+        case REQ_TYPE_ATA_PC:
                 return blk_rq_bytes(rq);
-        else
+        default:
                 return 0;
+        }
 }
 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
 
@@ -474,12 +477,12 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
                 if (uptodate == 0)
                         drive->failed_pc = NULL;
 
-                if (blk_special_request(rq)) {
+                if (rq->cmd_type == REQ_TYPE_SPECIAL) {
                         rq->errors = 0;
                         error = 0;
                 } else {
 
-                        if (blk_fs_request(rq) == 0 && uptodate <= 0) {
+                        if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {
                                 if (rq->errors == 0)
                                         rq->errors = -EIO;
                         }
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 2de76cc08f61..31fc76960a8f 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -31,6 +31,7 @@
 #include <linux/delay.h>
 #include <linux/timer.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/errno.h>
@@ -176,7 +177,7 @@ static void cdrom_analyze_sense_data(ide_drive_t *drive,
                         if (!sense->valid)
                                 break;
                         if (failed_command == NULL ||
-                                        !blk_fs_request(failed_command))
+                            failed_command->cmd_type != REQ_TYPE_FS)
                                 break;
                         sector = (sense->information[0] << 24) |
                                  (sense->information[1] << 16) |
@@ -292,7 +293,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                                   "stat 0x%x",
                                   rq->cmd[0], rq->cmd_type, err, stat);
 
-        if (blk_sense_request(rq)) {
+        if (rq->cmd_type == REQ_TYPE_SENSE) {
                 /*
                  * We got an error trying to get sense info from the drive
                  * (probably while trying to recover from a former error).
@@ -303,7 +304,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
         }
 
         /* if we have an error, pass CHECK_CONDITION as the SCSI status byte */
-        if (blk_pc_request(rq) && !rq->errors)
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC && !rq->errors)
                 rq->errors = SAM_STAT_CHECK_CONDITION;
 
         if (blk_noretry_request(rq))
@@ -311,13 +312,14 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 
         switch (sense_key) {
         case NOT_READY:
-                if (blk_fs_request(rq) && rq_data_dir(rq) == WRITE) {
+                if (rq->cmd_type == REQ_TYPE_FS && rq_data_dir(rq) == WRITE) {
                         if (ide_cd_breathe(drive, rq))
                                 return 1;
                 } else {
                         cdrom_saw_media_change(drive);
 
-                        if (blk_fs_request(rq) && !blk_rq_quiet(rq))
+                        if (rq->cmd_type == REQ_TYPE_FS &&
+                            !(rq->cmd_flags & REQ_QUIET))
                                 printk(KERN_ERR PFX "%s: tray open\n",
                                         drive->name);
                 }
@@ -326,7 +328,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
         case UNIT_ATTENTION:
                 cdrom_saw_media_change(drive);
 
-                if (blk_fs_request(rq) == 0)
+                if (rq->cmd_type != REQ_TYPE_FS)
                         return 0;
 
                 /*
@@ -352,7 +354,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                  * No point in retrying after an illegal request or data
                  * protect error.
                  */
-                if (!blk_rq_quiet(rq))
+                if (!(rq->cmd_flags & REQ_QUIET))
                         ide_dump_status(drive, "command error", stat);
                 do_end_request = 1;
                 break;
@@ -361,20 +363,20 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                  * No point in re-trying a zillion times on a bad sector.
                  * If we got here the error is not correctable.
                  */
-                if (!blk_rq_quiet(rq))
+                if (!(rq->cmd_flags & REQ_QUIET))
                         ide_dump_status(drive, "media error "
                                         "(bad sector)", stat);
                 do_end_request = 1;
                 break;
         case BLANK_CHECK:
                 /* disk appears blank? */
-                if (!blk_rq_quiet(rq))
+                if (!(rq->cmd_flags & REQ_QUIET))
                         ide_dump_status(drive, "media error (blank)",
                                         stat);
                 do_end_request = 1;
                 break;
         default:
-                if (blk_fs_request(rq) == 0)
+                if (rq->cmd_type != REQ_TYPE_FS)
                         break;
                 if (err & ~ATA_ABORTED) {
                         /* go to the default handler for other errors */
@@ -385,7 +387,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
                         do_end_request = 1;
         }
 
-        if (blk_fs_request(rq) == 0) {
+        if (rq->cmd_type != REQ_TYPE_FS) {
                 rq->cmd_flags |= REQ_FAILED;
                 do_end_request = 1;
         }
@@ -532,7 +534,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
         ide_expiry_t *expiry = NULL;
         int dma_error = 0, dma, thislen, uptodate = 0;
         int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
-        int sense = blk_sense_request(rq);
+        int sense = (rq->cmd_type == REQ_TYPE_SENSE);
         unsigned int timeout;
         u16 len;
         u8 ireason, stat;
@@ -575,7 +577,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 
         ide_read_bcount_and_ireason(drive, &len, &ireason);
 
-        thislen = blk_fs_request(rq) ? len : cmd->nleft;
+        thislen = (rq->cmd_type == REQ_TYPE_FS) ? len : cmd->nleft;
         if (thislen > len)
                 thislen = len;
 
@@ -584,7 +586,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 
         /* If DRQ is clear, the command has completed. */
         if ((stat & ATA_DRQ) == 0) {
-                if (blk_fs_request(rq)) {
+                if (rq->cmd_type == REQ_TYPE_FS) {
                         /*
                          * If we're not done reading/writing, complain.
                          * Otherwise, complete the command normally.
@@ -598,7 +600,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
                                         rq->cmd_flags |= REQ_FAILED;
                                 uptodate = 0;
                         }
-                } else if (!blk_pc_request(rq)) {
+                } else if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
                         ide_cd_request_sense_fixup(drive, cmd);
 
                         uptodate = cmd->nleft ? 0 : 1;
@@ -647,7 +649,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
 
         /* pad, if necessary */
         if (len > 0) {
-                if (blk_fs_request(rq) == 0 || write == 0)
+                if (rq->cmd_type != REQ_TYPE_FS || write == 0)
                         ide_pad_transfer(drive, write, len);
                 else {
                         printk(KERN_ERR PFX "%s: confused, missing data\n",
@@ -656,11 +658,11 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
                 }
         }
 
-        if (blk_pc_request(rq)) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 timeout = rq->timeout;
         } else {
                 timeout = ATAPI_WAIT_PC;
-                if (!blk_fs_request(rq))
+                if (rq->cmd_type != REQ_TYPE_FS)
                         expiry = ide_cd_expiry;
         }
 
@@ -669,7 +671,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
         return ide_started;
 
 out_end:
-        if (blk_pc_request(rq) && rc == 0) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC && rc == 0) {
                 rq->resid_len = 0;
                 blk_end_request_all(rq, 0);
                 hwif->rq = NULL;
@@ -677,7 +679,7 @@ out_end:
                 if (sense && uptodate)
                         ide_cd_complete_failed_rq(drive, rq);
 
-                if (blk_fs_request(rq)) {
+                if (rq->cmd_type == REQ_TYPE_FS) {
                         if (cmd->nleft == 0)
                                 uptodate = 1;
                 } else {
@@ -690,7 +692,7 @@ out_end:
                                 return ide_stopped;
 
                 /* make sure it's fully ended */
-                if (blk_fs_request(rq) == 0) {
+                if (rq->cmd_type != REQ_TYPE_FS) {
                         rq->resid_len -= cmd->nbytes - cmd->nleft;
                         if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
                                 rq->resid_len += cmd->last_xfer_len;
@@ -750,7 +752,7 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
         ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
                                   rq->cmd[0], rq->cmd_type);
 
-        if (blk_pc_request(rq))
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
                 rq->cmd_flags |= REQ_QUIET;
         else
                 rq->cmd_flags &= ~REQ_FAILED;
@@ -791,21 +793,26 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
         if (drive->debug_mask & IDE_DBG_RQ)
                 blk_dump_rq_flags(rq, "ide_cd_do_request");
 
-        if (blk_fs_request(rq)) {
+        switch (rq->cmd_type) {
+        case REQ_TYPE_FS:
                 if (cdrom_start_rw(drive, rq) == ide_stopped)
                         goto out_end;
-        } else if (blk_sense_request(rq) || blk_pc_request(rq) ||
-                   rq->cmd_type == REQ_TYPE_ATA_PC) {
+                break;
+        case REQ_TYPE_SENSE:
+        case REQ_TYPE_BLOCK_PC:
+        case REQ_TYPE_ATA_PC:
                 if (!rq->timeout)
                         rq->timeout = ATAPI_WAIT_PC;
 
                 cdrom_do_block_pc(drive, rq);
-        } else if (blk_special_request(rq)) {
+                break;
+        case REQ_TYPE_SPECIAL:
                 /* right now this can only be a reset... */
                 uptodate = 1;
                 goto out_end;
-        } else
+        default:
                 BUG();
+        }
 
         /* prepare sense request for this command */
         ide_prep_sense(drive, rq);
@@ -817,7 +824,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
 
         cmd.rq = rq;
 
-        if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
+        if (rq->cmd_type == REQ_TYPE_FS || blk_rq_bytes(rq)) {
                 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
                 ide_map_sg(drive, &cmd);
         }
@@ -1373,9 +1380,9 @@ static int ide_cdrom_prep_pc(struct request *rq)
 
 static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
 {
-        if (blk_fs_request(rq))
+        if (rq->cmd_type == REQ_TYPE_FS)
                 return ide_cdrom_prep_fs(q, rq);
-        else if (blk_pc_request(rq))
+        else if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
                 return ide_cdrom_prep_pc(rq);
 
         return 0;
@@ -1592,17 +1599,19 @@ static struct ide_driver ide_cdrom_driver = {
 
 static int idecd_open(struct block_device *bdev, fmode_t mode)
 {
-        struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
-        int rc = -ENOMEM;
+        struct cdrom_info *info;
+        int rc = -ENXIO;
 
+        lock_kernel();
+        info = ide_cd_get(bdev->bd_disk);
         if (!info)
-                return -ENXIO;
+                goto out;
 
         rc = cdrom_open(&info->devinfo, bdev, mode);
-
         if (rc < 0)
                 ide_cd_put(info);
-
+out:
+        unlock_kernel();
         return rc;
 }
 
@@ -1610,9 +1619,11 @@ static int idecd_release(struct gendisk *disk, fmode_t mode)
 {
         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
 
+        lock_kernel();
         cdrom_release(&info->devinfo, mode);
 
         ide_cd_put(info);
+        unlock_kernel();
 
         return 0;
 }
@@ -1656,7 +1667,7 @@ static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
         return 0;
 }
 
-static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
+static int idecd_locked_ioctl(struct block_device *bdev, fmode_t mode,
                         unsigned int cmd, unsigned long arg)
 {
         struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
@@ -1678,6 +1689,19 @@ static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
         return err;
 }
 
+static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
+                             unsigned int cmd, unsigned long arg)
+{
+        int ret;
+
+        lock_kernel();
+        ret = idecd_locked_ioctl(bdev, mode, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}
+
+
 static int idecd_media_changed(struct gendisk *disk)
 {
         struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
@@ -1698,7 +1722,7 @@ static const struct block_device_operations idecd_ops = {
         .owner                  = THIS_MODULE,
         .open                   = idecd_open,
         .release                = idecd_release,
-        .locked_ioctl           = idecd_ioctl,
+        .ioctl                  = idecd_ioctl,
         .media_changed          = idecd_media_changed,
         .revalidate_disk        = idecd_revalidate_disk
 };
diff --git a/drivers/ide/ide-cd_ioctl.c b/drivers/ide/ide-cd_ioctl.c
index 02712bf045c1..766b3deeb23c 100644
--- a/drivers/ide/ide-cd_ioctl.c
+++ b/drivers/ide/ide-cd_ioctl.c
@@ -454,7 +454,7 @@ int ide_cdrom_packet(struct cdrom_device_info *cdi,
            touch it at all. */
 
         if (cgc->data_direction == CGC_DATA_WRITE)
-                flags |= REQ_RW;
+                flags |= REQ_WRITE;
 
         if (cgc->sense)
                 memset(cgc->sense, 0, sizeof(struct request_sense));
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 33d65039cce9..7433e07de30e 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -184,7 +184,7 @@ static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
         ide_hwif_t *hwif = drive->hwif;
 
         BUG_ON(drive->dev_flags & IDE_DFLAG_BLOCKED);
-        BUG_ON(!blk_fs_request(rq));
+        BUG_ON(rq->cmd_type != REQ_TYPE_FS);
 
         ledtrig_ide_activity();
 
@@ -427,10 +427,15 @@ static void ide_disk_unlock_native_capacity(ide_drive_t *drive)
                 drive->dev_flags |= IDE_DFLAG_NOHPA; /* disable HPA on resume */
 }
 
-static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
+static int idedisk_prep_fn(struct request_queue *q, struct request *rq)
 {
         ide_drive_t *drive = q->queuedata;
-        struct ide_cmd *cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
+        struct ide_cmd *cmd;
+
+        if (!(rq->cmd_flags & REQ_FLUSH))
+                return BLKPREP_OK;
+
+        cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
 
         /* FIXME: map struct ide_taskfile on rq->cmd[] */
         BUG_ON(cmd == NULL);
@@ -448,6 +453,8 @@ static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
         rq->special = cmd;
         cmd->rq = rq;
+
+        return BLKPREP_OK;
 }
 
 ide_devset_get(multcount, mult_count);
@@ -513,7 +520,6 @@ static void update_ordered(ide_drive_t *drive)
 {
         u16 *id = drive->id;
         unsigned ordered = QUEUE_ORDERED_NONE;
-        prepare_flush_fn *prep_fn = NULL;
 
         if (drive->dev_flags & IDE_DFLAG_WCACHE) {
                 unsigned long long capacity;
@@ -538,12 +544,12 @@ static void update_ordered(ide_drive_t *drive)
 
                 if (barrier) {
                         ordered = QUEUE_ORDERED_DRAIN_FLUSH;
-                        prep_fn = idedisk_prepare_flush;
+                        blk_queue_prep_rq(drive->queue, idedisk_prep_fn);
                 }
         } else
                 ordered = QUEUE_ORDERED_DRAIN;
 
-        blk_queue_ordered(drive->queue, ordered, prep_fn);
+        blk_queue_ordered(drive->queue, ordered);
 }
 
 ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE);
diff --git a/drivers/ide/ide-disk_ioctl.c b/drivers/ide/ide-disk_ioctl.c
index 7b783dd7c0be..ec94c66918f6 100644
--- a/drivers/ide/ide-disk_ioctl.c
+++ b/drivers/ide/ide-disk_ioctl.c
@@ -1,6 +1,7 @@
 #include <linux/kernel.h>
 #include <linux/ide.h>
 #include <linux/hdreg.h>
+#include <linux/smp_lock.h>
 
 #include "ide-disk.h"
 
@@ -18,9 +19,13 @@ int ide_disk_ioctl(ide_drive_t *drive, struct block_device *bdev, fmode_t mode,
 {
         int err;
 
+        lock_kernel();
         err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_disk_ioctl_settings);
         if (err != -EOPNOTSUPP)
-                return err;
+                goto out;
 
-        return generic_ide_ioctl(drive, bdev, cmd, arg);
+        err = generic_ide_ioctl(drive, bdev, cmd, arg);
+out:
+        unlock_kernel();
+        return err;
 }
diff --git a/drivers/ide/ide-eh.c b/drivers/ide/ide-eh.c
index e9abf2c3c335..c0aa93fb7a60 100644
--- a/drivers/ide/ide-eh.c
+++ b/drivers/ide/ide-eh.c
@@ -122,7 +122,7 @@ ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat)
                 return ide_stopped;
 
         /* retry only "normal" I/O: */
-        if (!blk_fs_request(rq)) {
+        if (rq->cmd_type != REQ_TYPE_FS) {
                 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
                         struct ide_cmd *cmd = rq->special;
 
@@ -146,7 +146,8 @@ static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 {
         struct request *rq = drive->hwif->rq;
 
-        if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET) {
+        if (rq && rq->cmd_type == REQ_TYPE_SPECIAL &&
+            rq->cmd[0] == REQ_DRIVE_RESET) {
                 if (err <= 0 && rq->errors == 0)
                         rq->errors = -EIO;
                 ide_complete_rq(drive, err ? err : 0, blk_rq_bytes(rq));
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 4713bdca20b6..5406b6ea3ad1 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -73,7 +73,7 @@ static int ide_floppy_callback(ide_drive_t *drive, int dsc)
                 drive->failed_pc = NULL;
 
         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
-            (rq && blk_pc_request(rq)))
+            (rq && rq->cmd_type == REQ_TYPE_BLOCK_PC))
                 uptodate = 1; /* FIXME */
         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 
@@ -98,7 +98,7 @@ static int ide_floppy_callback(ide_drive_t *drive, int dsc)
                                "Aborting request!\n");
         }
 
-        if (blk_special_request(rq))
+        if (rq->cmd_type == REQ_TYPE_SPECIAL)
                 rq->errors = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
 
         return uptodate;
@@ -207,7 +207,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
         memcpy(rq->cmd, pc->c, 12);
 
         pc->rq = rq;
-        if (rq->cmd_flags & REQ_RW)
+        if (rq->cmd_flags & REQ_WRITE)
                 pc->flags |= PC_FLAG_WRITING;
 
         pc->flags |= PC_FLAG_DMA_OK;
@@ -247,14 +247,16 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
                 } else
                         printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
 
-                if (blk_special_request(rq)) {
+                if (rq->cmd_type == REQ_TYPE_SPECIAL) {
                         rq->errors = 0;
                         ide_complete_rq(drive, 0, blk_rq_bytes(rq));
                         return ide_stopped;
                 } else
                         goto out_end;
         }
-        if (blk_fs_request(rq)) {
+
+        switch (rq->cmd_type) {
+        case REQ_TYPE_FS:
                 if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
                     (blk_rq_sectors(rq) % floppy->bs_factor)) {
                         printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
@@ -263,13 +265,18 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
                 }
                 pc = &floppy->queued_pc;
                 idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
-        } else if (blk_special_request(rq) || blk_sense_request(rq)) {
+                break;
+        case REQ_TYPE_SPECIAL:
+        case REQ_TYPE_SENSE:
                 pc = (struct ide_atapi_pc *)rq->special;
-        } else if (blk_pc_request(rq)) {
+                break;
+        case REQ_TYPE_BLOCK_PC:
                 pc = &floppy->queued_pc;
                 idefloppy_blockpc_cmd(floppy, pc, rq);
-        } else
+                break;
+        default:
                 BUG();
+        }
 
         ide_prep_sense(drive, rq);
 
@@ -280,7 +287,7 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
 
         cmd.rq = rq;
 
-        if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
+        if (rq->cmd_type == REQ_TYPE_FS || blk_rq_bytes(rq)) {
                 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
                 ide_map_sg(drive, &cmd);
         }
@@ -290,7 +297,7 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
         return ide_floppy_issue_pc(drive, &cmd, pc);
 out_end:
         drive->failed_pc = NULL;
-        if (blk_fs_request(rq) == 0 && rq->errors == 0)
+        if (rq->cmd_type != REQ_TYPE_FS && rq->errors == 0)
                 rq->errors = -EIO;
         ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
         return ide_stopped;
diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
index 9c2288234dea..fd3d05ab3417 100644
--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -5,6 +5,7 @@
 #include <linux/kernel.h>
 #include <linux/ide.h>
 #include <linux/cdrom.h>
+#include <linux/smp_lock.h>
 
 #include <asm/unaligned.h>
 
@@ -275,12 +276,15 @@ int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
         void __user *argp = (void __user *)arg;
         int err;
 
-        if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
-                return ide_floppy_lockdoor(drive, &pc, arg, cmd);
+        lock_kernel();
+        if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
+                err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
+                goto out;
+        }
 
         err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
         if (err != -ENOTTY)
-                return err;
+                goto out;
 
         /*
          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
@@ -293,5 +297,7 @@ int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
         if (err == -ENOTTY)
                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
 
+out:
+        unlock_kernel();
         return err;
 }
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c
index 79399534782c..70aeeb18833e 100644
--- a/drivers/ide/ide-gd.c
+++ b/drivers/ide/ide-gd.c
@@ -1,3 +1,4 @@
+#include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/string.h>
@@ -237,6 +238,18 @@ out_put_idkp:
         return ret;
 }
 
+static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+        int ret;
+
+        lock_kernel();
+        ret = ide_gd_open(bdev, mode);
+        unlock_kernel();
+
+        return ret;
+}
+
+
 static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 {
         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
@@ -244,6 +257,7 @@ static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 
         ide_debug_log(IDE_DBG_FUNC, "enter");
 
+        lock_kernel();
         if (idkp->openers == 1)
                 drive->disk_ops->flush(drive);
 
@@ -255,6 +269,7 @@ static int ide_gd_release(struct gendisk *disk, fmode_t mode)
         idkp->openers--;
 
         ide_disk_put(idkp);
+        unlock_kernel();
 
         return 0;
 }
@@ -321,9 +336,9 @@ static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
 
 static const struct block_device_operations ide_gd_ops = {
         .owner                  = THIS_MODULE,
-        .open                   = ide_gd_open,
+        .open                   = ide_gd_unlocked_open,
         .release                = ide_gd_release,
-        .locked_ioctl           = ide_gd_ioctl,
+        .ioctl                  = ide_gd_ioctl,
         .getgeo                 = ide_gd_getgeo,
         .media_changed          = ide_gd_media_changed,
         .unlock_native_capacity = ide_gd_unlock_native_capacity,
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 172ac9218154..a381be814070 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -135,7 +135,7 @@ EXPORT_SYMBOL(ide_complete_rq);
 
 void ide_kill_rq(ide_drive_t *drive, struct request *rq)
 {
-        u8 drv_req = blk_special_request(rq) && rq->rq_disk;
+        u8 drv_req = (rq->cmd_type == REQ_TYPE_SPECIAL) && rq->rq_disk;
         u8 media = drive->media;
 
         drive->failed_pc = NULL;
@@ -145,7 +145,7 @@ void ide_kill_rq(ide_drive_t *drive, struct request *rq)
         } else {
                 if (media == ide_tape)
                         rq->errors = IDE_DRV_ERROR_GENERAL;
-                else if (blk_fs_request(rq) == 0 && rq->errors == 0)
+                else if (rq->cmd_type != REQ_TYPE_FS && rq->errors == 0)
                         rq->errors = -EIO;
         }
 
@@ -307,7 +307,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
 {
         ide_startstop_t startstop;
 
-        BUG_ON(!blk_rq_started(rq));
+        BUG_ON(!(rq->cmd_flags & REQ_STARTED));
 
 #ifdef DEBUG
         printk("%s: start_request: current=0x%08lx\n",
@@ -353,7 +353,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
                             pm->pm_step == IDE_PM_COMPLETED)
                                 ide_complete_pm_rq(drive, rq);
                         return startstop;
-                } else if (!rq->rq_disk && blk_special_request(rq))
+                } else if (!rq->rq_disk && rq->cmd_type == REQ_TYPE_SPECIAL)
                         /*
                          * TODO: Once all ULDs have been modified to
                          * check for specific op codes rather than
diff --git a/drivers/ide/ide-pm.c b/drivers/ide/ide-pm.c
index 1c08311b0a0e..92406097efeb 100644
--- a/drivers/ide/ide-pm.c
+++ b/drivers/ide/ide-pm.c
@@ -191,10 +191,10 @@ void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 
 #ifdef DEBUG_PM
         printk("%s: completing PM request, %s\n", drive->name,
-               blk_pm_suspend_request(rq) ? "suspend" : "resume");
+               (rq->cmd_type == REQ_TYPE_PM_SUSPEND) ? "suspend" : "resume");
 #endif
         spin_lock_irqsave(q->queue_lock, flags);
-        if (blk_pm_suspend_request(rq))
+        if (rq->cmd_type == REQ_TYPE_PM_SUSPEND)
                 blk_stop_queue(q);
         else
                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
@@ -210,11 +210,11 @@ void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 {
         struct request_pm_state *pm = rq->special;
 
-        if (blk_pm_suspend_request(rq) &&
+        if (rq->cmd_type == REQ_TYPE_PM_SUSPEND &&
             pm->pm_step == IDE_PM_START_SUSPEND)
                 /* Mark drive blocked when starting the suspend sequence. */
                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
-        else if (blk_pm_resume_request(rq) &&
+        else if (rq->cmd_type == REQ_TYPE_PM_RESUME &&
                  pm->pm_step == IDE_PM_START_RESUME) {
                 /*
                  * The first thing we do on wakeup is to wait for BSY bit to
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index b07232880ec9..6d622cb5ac81 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -32,6 +32,7 @@
 #include <linux/errno.h>
 #include <linux/genhd.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/ide.h>
@@ -577,7 +578,8 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
                       rq->cmd[0], (unsigned long long)blk_rq_pos(rq),
                       blk_rq_sectors(rq));
 
-        BUG_ON(!(blk_special_request(rq) || blk_sense_request(rq)));
+        BUG_ON(!(rq->cmd_type == REQ_TYPE_SPECIAL ||
+                 rq->cmd_type == REQ_TYPE_SENSE));
 
         /* Retry a failed packet command */
         if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
@@ -1905,7 +1907,11 @@ static const struct file_operations idetape_fops = {
 
 static int idetape_open(struct block_device *bdev, fmode_t mode)
 {
-        struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0);
+        struct ide_tape_obj *tape;
+
+        lock_kernel();
+        tape = ide_tape_get(bdev->bd_disk, false, 0);
+        unlock_kernel();
 
         if (!tape)
                 return -ENXIO;
@@ -1917,7 +1923,10 @@ static int idetape_release(struct gendisk *disk, fmode_t mode)
 {
         struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
 
+        lock_kernel();
         ide_tape_put(tape);
+        unlock_kernel();
+
         return 0;
 }
 
@@ -1926,9 +1935,14 @@ static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
 {
         struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
         ide_drive_t *drive = tape->drive;
-        int err = generic_ide_ioctl(drive, bdev, cmd, arg);
+        int err;
+
+        lock_kernel();
+        err = generic_ide_ioctl(drive, bdev, cmd, arg);
         if (err == -EINVAL)
                 err = idetape_blkdev_ioctl(drive, cmd, arg);
+        unlock_kernel();
+
         return err;
 }
 
@@ -1936,7 +1950,7 @@ static const struct block_device_operations idetape_block_ops = {
         .owner          = THIS_MODULE,
         .open           = idetape_open,
         .release        = idetape_release,
-        .locked_ioctl   = idetape_ioctl,
+        .ioctl          = idetape_ioctl,
 };
 
 static int ide_tape_probe(ide_drive_t *drive)
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 10f457ca6af2..0590c75b0ab6 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -356,7 +356,7 @@ static void dispatch_io(int rw, unsigned int num_regions,
         BUG_ON(num_regions > DM_IO_MAX_REGIONS);
 
         if (sync)
-                rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+                rw |= REQ_SYNC | REQ_UNPLUG;
 
         /*
          * For multiple regions we need to be careful to rewind
@@ -364,7 +364,7 @@ static void dispatch_io(int rw, unsigned int num_regions,
          */
         for (i = 0; i < num_regions; i++) {
                 *dp = old_pages;
-                if (where[i].count || (rw & (1 << BIO_RW_BARRIER)))
+                if (where[i].count || (rw & REQ_HARDBARRIER))
                         do_region(rw, i, where + i, dp, io);
         }
 
@@ -412,8 +412,8 @@ retry:
         }
         set_current_state(TASK_RUNNING);
 
-        if (io->eopnotsupp_bits && (rw & (1 << BIO_RW_BARRIER))) {
-                rw &= ~(1 << BIO_RW_BARRIER);
+        if (io->eopnotsupp_bits && (rw & REQ_HARDBARRIER)) {
+                rw &= ~REQ_HARDBARRIER;
                 goto retry;
         }
 
@@ -479,8 +479,8 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
  * New collapsed (a)synchronous interface.
  *
  * If the IO is asynchronous (i.e. it has notify.fn), you must either unplug
- * the queue with blk_unplug() some time later or set the BIO_RW_SYNC bit in
- * io_req->bi_rw. If you fail to do one of these, the IO will be submitted to
+ * the queue with blk_unplug() some time later or set REQ_SYNC in
+io_req->bi_rw. If you fail to do one of these, the IO will be submitted to
  * the disk after q->unplug_delay, which defaults to 3ms in blk-settings.c.
  */
 int dm_io(struct dm_io_request *io_req, unsigned num_regions,
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index addf83475040..d8587bac5682 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -345,7 +345,7 @@ static int run_io_job(struct kcopyd_job *job)
 {
         int r;
         struct dm_io_request io_req = {
-                .bi_rw = job->rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG),
+                .bi_rw = job->rw | REQ_SYNC | REQ_UNPLUG,
                 .mem.type = DM_IO_PAGE_LIST,
                 .mem.ptr.pl = job->pages,
                 .mem.offset = job->offset,
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index ddda531723dc..74136262d654 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1211,7 +1211,7 @@ static int mirror_end_io(struct dm_target *ti, struct bio *bio,
         if (error == -EOPNOTSUPP)
                 goto out;
 
-        if ((error == -EWOULDBLOCK) && bio_rw_flagged(bio, BIO_RW_AHEAD))
+        if ((error == -EWOULDBLOCK) && (bio->bi_rw & REQ_RAHEAD))
                 goto out;
 
         if (unlikely(error)) {
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index e610725db766..d6e28d732b4d 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -284,7 +284,7 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio,
         if (!error)
                 return 0; /* I/O complete */
 
-        if ((error == -EWOULDBLOCK) && bio_rw_flagged(bio, BIO_RW_AHEAD))
+        if ((error == -EWOULDBLOCK) && (bio->bi_rw & REQ_RAHEAD))
                 return error;
 
         if (error == -EOPNOTSUPP)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index d21e1284604f..a3f21dc02bd8 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -15,6 +15,7 @@
 #include <linux/blkpg.h>
 #include <linux/bio.h>
 #include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
 #include <linux/mempool.h>
 #include <linux/slab.h>
 #include <linux/idr.h>
@@ -338,6 +339,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 {
         struct mapped_device *md;
 
+        lock_kernel();
         spin_lock(&_minor_lock);
 
         md = bdev->bd_disk->private_data;
@@ -355,6 +357,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 
 out:
         spin_unlock(&_minor_lock);
+        unlock_kernel();
 
         return md ? 0 : -ENXIO;
 }
@@ -362,8 +365,12 @@ out:
 static int dm_blk_close(struct gendisk *disk, fmode_t mode)
 {
         struct mapped_device *md = disk->private_data;
+
+        lock_kernel();
         atomic_dec(&md->open_count);
         dm_put(md);
+        unlock_kernel();
+
         return 0;
 }
 
@@ -614,7 +621,7 @@ static void dec_pending(struct dm_io *io, int error)
                          */
                         spin_lock_irqsave(&md->deferred_lock, flags);
                         if (__noflush_suspending(md)) {
-                                if (!bio_rw_flagged(io->bio, BIO_RW_BARRIER))
+                                if (!(io->bio->bi_rw & REQ_HARDBARRIER))
                                         bio_list_add_head(&md->deferred,
                                                           io->bio);
                         } else
@@ -626,7 +633,7 @@ static void dec_pending(struct dm_io *io, int error)
                 io_error = io->error;
                 bio = io->bio;
 
-                if (bio_rw_flagged(bio, BIO_RW_BARRIER)) {
+                if (bio->bi_rw & REQ_HARDBARRIER) {
                         /*
                          * There can be just one barrier request so we use
                          * a per-device variable for error reporting.
@@ -792,12 +799,12 @@ static void dm_end_request(struct request *clone, int error)
 {
         int rw = rq_data_dir(clone);
         int run_queue = 1;
-        bool is_barrier = blk_barrier_rq(clone);
+        bool is_barrier = clone->cmd_flags & REQ_HARDBARRIER;
         struct dm_rq_target_io *tio = clone->end_io_data;
         struct mapped_device *md = tio->md;
         struct request *rq = tio->orig;
 
-        if (blk_pc_request(rq) && !is_barrier) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC && !is_barrier) {
                 rq->errors = clone->errors;
                 rq->resid_len = clone->resid_len;
 
@@ -844,7 +851,7 @@ void dm_requeue_unmapped_request(struct request *clone)
         struct request_queue *q = rq->q;
         unsigned long flags;
 
-        if (unlikely(blk_barrier_rq(clone))) {
+        if (unlikely(clone->cmd_flags & REQ_HARDBARRIER)) {
                 /*
                  * Barrier clones share an original request.
                  * Leave it to dm_end_request(), which handles this special
@@ -943,7 +950,7 @@ static void dm_complete_request(struct request *clone, int error)
         struct dm_rq_target_io *tio = clone->end_io_data;
         struct request *rq = tio->orig;
 
-        if (unlikely(blk_barrier_rq(clone))) {
+        if (unlikely(clone->cmd_flags & REQ_HARDBARRIER)) {
                 /*
                  * Barrier clones share an original request.  So can't use
                  * softirq_done with the original.
@@ -972,7 +979,7 @@ void dm_kill_unmapped_request(struct request *clone, int error)
         struct dm_rq_target_io *tio = clone->end_io_data;
         struct request *rq = tio->orig;
 
-        if (unlikely(blk_barrier_rq(clone))) {
+        if (unlikely(clone->cmd_flags & REQ_HARDBARRIER)) {
                 /*
                  * Barrier clones share an original request.
                  * Leave it to dm_end_request(), which handles this special
@@ -1106,7 +1113,7 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
 
         clone->bi_sector = sector;
         clone->bi_bdev = bio->bi_bdev;
-        clone->bi_rw = bio->bi_rw & ~(1 << BIO_RW_BARRIER);
+        clone->bi_rw = bio->bi_rw & ~REQ_HARDBARRIER;
         clone->bi_vcnt = 1;
         clone->bi_size = to_bytes(len);
         clone->bi_io_vec->bv_offset = offset;
@@ -1133,7 +1140,7 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
 
         clone = bio_alloc_bioset(GFP_NOIO, bio->bi_max_vecs, bs);
         __bio_clone(clone, bio);
-        clone->bi_rw &= ~(1 << BIO_RW_BARRIER);
+        clone->bi_rw &= ~REQ_HARDBARRIER;
         clone->bi_destructor = dm_bio_destructor;
         clone->bi_sector = sector;
         clone->bi_idx = idx;
@@ -1301,7 +1308,7 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
 
         ci.map = dm_get_live_table(md);
         if (unlikely(!ci.map)) {
-                if (!bio_rw_flagged(bio, BIO_RW_BARRIER))
+                if (!(bio->bi_rw & REQ_HARDBARRIER))
                         bio_io_error(bio);
                 else
                         if (!md->barrier_error)
@@ -1414,7 +1421,7 @@ static int _dm_request(struct request_queue *q, struct bio *bio)
          * we have to queue this io for later.
          */
         if (unlikely(test_bit(DMF_QUEUE_IO_TO_THREAD, &md->flags)) ||
-            unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+            unlikely(bio->bi_rw & REQ_HARDBARRIER)) {
                 up_read(&md->io_lock);
 
                 if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) &&
@@ -1455,20 +1462,9 @@ static int dm_request(struct request_queue *q, struct bio *bio)
         return _dm_request(q, bio);
 }
 
-/*
- * Mark this request as flush request, so that dm_request_fn() can
- * recognize.
- */
-static void dm_rq_prepare_flush(struct request_queue *q, struct request *rq)
-{
-        rq->cmd_type = REQ_TYPE_LINUX_BLOCK;
-        rq->cmd[0] = REQ_LB_OP_FLUSH;
-}
-
 static bool dm_rq_is_flush_request(struct request *rq)
 {
-        if (rq->cmd_type == REQ_TYPE_LINUX_BLOCK &&
-            rq->cmd[0] == REQ_LB_OP_FLUSH)
+        if (rq->cmd_flags & REQ_FLUSH)
                 return true;
         else
                 return false;
@@ -1912,8 +1908,7 @@ static struct mapped_device *alloc_dev(int minor)
         blk_queue_softirq_done(md->queue, dm_softirq_done);
         blk_queue_prep_rq(md->queue, dm_prep_fn);
         blk_queue_lld_busy(md->queue, dm_lld_busy);
-        blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN_FLUSH,
-                          dm_rq_prepare_flush);
+        blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN_FLUSH);
 
         md->disk = alloc_disk(1);
         if (!md->disk)
@@ -2296,7 +2291,7 @@ static void dm_wq_work(struct work_struct *work)
                 if (dm_request_based(md))
                         generic_make_request(c);
                 else {
-                        if (bio_rw_flagged(c, BIO_RW_BARRIER))
+                        if (c->bi_rw & REQ_HARDBARRIER)
                                 process_barrier(md, c);
                         else
                                 __split_and_process_bio(md, c);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 7e0e057db9a7..ba19060bcf3f 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -294,7 +294,7 @@ static int linear_make_request (mddev_t *mddev, struct bio *bio)
         dev_info_t *tmp_dev;
         sector_t start_sector;
 
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+        if (unlikely(bio->bi_rw & REQ_HARDBARRIER)) {
                 md_barrier_request(mddev, bio);
                 return 0;
         }
diff --git a/drivers/md/md.c b/drivers/md/md.c
index cb20d0b0555a..700c96edf9b2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -36,6 +36,7 @@
 #include <linux/blkdev.h>
 #include <linux/sysctl.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/buffer_head.h> /* for invalidate_bdev */
 #include <linux/poll.h>
 #include <linux/ctype.h>
@@ -353,7 +354,7 @@ static void md_submit_barrier(struct work_struct *ws)
                 /* an empty barrier - all done */
                 bio_endio(bio, 0);
         else {
-                bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
+                bio->bi_rw &= ~REQ_HARDBARRIER;
                 if (mddev->pers->make_request(mddev, bio))
                         generic_make_request(bio);
                 mddev->barrier = POST_REQUEST_BARRIER;
@@ -675,11 +676,11 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
          * if zero is reached.
          * If an error occurred, call md_error
          *
-         * As we might need to resubmit the request if BIO_RW_BARRIER
+         * As we might need to resubmit the request if REQ_HARDBARRIER
          * causes ENOTSUPP, we allocate a spare bio...
          */
         struct bio *bio = bio_alloc(GFP_NOIO, 1);
-        int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
+        int rw = REQ_WRITE | REQ_SYNC | REQ_UNPLUG;
 
         bio->bi_bdev = rdev->bdev;
         bio->bi_sector = sector;
@@ -691,7 +692,7 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
         atomic_inc(&mddev->pending_writes);
         if (!test_bit(BarriersNotsupp, &rdev->flags)) {
                 struct bio *rbio;
-                rw |= (1<<BIO_RW_BARRIER);
+                rw |= REQ_HARDBARRIER;
                 rbio = bio_clone(bio, GFP_NOIO);
                 rbio->bi_private = bio;
                 rbio->bi_end_io = super_written_barrier;
@@ -736,7 +737,7 @@ int sync_page_io(struct block_device *bdev, sector_t sector, int size,
         struct completion event;
         int ret;
 
-        rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+        rw |= REQ_SYNC | REQ_UNPLUG;
 
         bio->bi_bdev = bdev;
         bio->bi_sector = sector;
@@ -5902,6 +5903,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
         mddev_t *mddev = mddev_find(bdev->bd_dev);
         int err;
 
+        lock_kernel();
         if (mddev->gendisk != bdev->bd_disk) {
                 /* we are racing with mddev_put which is discarding this
                  * bd_disk.
@@ -5910,6 +5912,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
                 /* Wait until bdev->bd_disk is definitely gone */
                 flush_scheduled_work();
                 /* Then retry the open from the top */
+                unlock_kernel();
                 return -ERESTARTSYS;
         }
         BUG_ON(mddev != bdev->bd_disk->private_data);
@@ -5923,6 +5926,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
 
         check_disk_size_change(mddev->gendisk, bdev);
  out:
+        unlock_kernel();
         return err;
 }
 
@@ -5931,8 +5935,10 @@ static int md_release(struct gendisk *disk, fmode_t mode)
         mddev_t *mddev = disk->private_data;
 
         BUG_ON(!mddev);
+        lock_kernel();
         atomic_dec(&mddev->openers);
         mddev_put(mddev);
+        unlock_kernel();
 
         return 0;
 }
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 10597bfec000..fc56e0f21c80 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -67,7 +67,7 @@ struct mdk_rdev_s
 #define Faulty          1               /* device is known to have a fault */
 #define In_sync         2               /* device is in_sync with rest of array */
 #define WriteMostly     4               /* Avoid reading if at all possible */
-#define BarriersNotsupp 5               /* BIO_RW_BARRIER is not supported */
+#define BarriersNotsupp 5               /* REQ_HARDBARRIER is not supported */
 #define AllReserved     6               /* If whole device is reserved for
                                          * one array */
 #define AutoDetected    7               /* added by auto-detect */
@@ -254,7 +254,7 @@ struct mddev_s
                                                          * fails.  Only supported
                                                          */
         struct bio                      *biolist;       /* bios that need to be retried
-                                                         * because BIO_RW_BARRIER is not supported
+                                                         * because REQ_HARDBARRIER is not supported
                                                          */
 
         atomic_t                        recovery_active; /* blocks scheduled, but not written */
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 410fb60699ac..0307d217e7a4 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -91,7 +91,7 @@ static void multipath_end_request(struct bio *bio, int error)
 
         if (uptodate)
                 multipath_end_bh_io(mp_bh, 0);
-        else if (!bio_rw_flagged(bio, BIO_RW_AHEAD)) {
+        else if (!(bio->bi_rw & REQ_RAHEAD)) {
                 /*
                  * oops, IO error:
                  */
@@ -142,7 +142,7 @@ static int multipath_make_request(mddev_t *mddev, struct bio * bio)
         struct multipath_bh * mp_bh;
         struct multipath_info *multipath;
 
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+        if (unlikely(bio->bi_rw & REQ_HARDBARRIER)) {
                 md_barrier_request(mddev, bio);
                 return 0;
         }
@@ -163,7 +163,7 @@ static int multipath_make_request(mddev_t *mddev, struct bio * bio)
         mp_bh->bio = *bio;
         mp_bh->bio.bi_sector += multipath->rdev->data_offset;
         mp_bh->bio.bi_bdev = multipath->rdev->bdev;
-        mp_bh->bio.bi_rw |= (1 << BIO_RW_FAILFAST_TRANSPORT);
+        mp_bh->bio.bi_rw |= REQ_FAILFAST_TRANSPORT;
         mp_bh->bio.bi_end_io = multipath_end_request;
         mp_bh->bio.bi_private = mp_bh;
         generic_make_request(&mp_bh->bio);
@@ -398,7 +398,7 @@ static void multipathd (mddev_t *mddev)
                         *bio = *(mp_bh->master_bio);
                         bio->bi_sector += conf->multipaths[mp_bh->path].rdev->data_offset;
                         bio->bi_bdev = conf->multipaths[mp_bh->path].rdev->bdev;
-                        bio->bi_rw |= (1 << BIO_RW_FAILFAST_TRANSPORT);
+                        bio->bi_rw |= REQ_FAILFAST_TRANSPORT;
                         bio->bi_end_io = multipath_end_request;
                         bio->bi_private = mp_bh;
                         generic_make_request(bio);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 563abed5a2cb..6f7af46d623c 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -483,7 +483,7 @@ static int raid0_make_request(mddev_t *mddev, struct bio *bio)
         struct strip_zone *zone;
         mdk_rdev_t *tmp_dev;
 
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+        if (unlikely(bio->bi_rw & REQ_HARDBARRIER)) {
                 md_barrier_request(mddev, bio);
                 return 0;
         }
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a948da8012de..73cc74ffc26b 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -787,7 +787,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
         struct bio_list bl;
         struct page **behind_pages = NULL;
         const int rw = bio_data_dir(bio);
-        const bool do_sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
+        const bool do_sync = (bio->bi_rw & REQ_SYNC);
         bool do_barriers;
         mdk_rdev_t *blocked_rdev;
 
@@ -822,7 +822,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                 finish_wait(&conf->wait_barrier, &w);
         }
         if (unlikely(!mddev->barriers_work &&
-                     bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+                     (bio->bi_rw & REQ_HARDBARRIER))) {
                 if (rw == WRITE)
                         md_write_end(mddev);
                 bio_endio(bio, -EOPNOTSUPP);
@@ -877,7 +877,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                 read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset;
                 read_bio->bi_bdev = mirror->rdev->bdev;
                 read_bio->bi_end_io = raid1_end_read_request;
-                read_bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
+                read_bio->bi_rw = READ | do_sync;
                 read_bio->bi_private = r1_bio;
 
                 generic_make_request(read_bio);
@@ -959,7 +959,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
         atomic_set(&r1_bio->remaining, 0);
         atomic_set(&r1_bio->behind_remaining, 0);
 
-        do_barriers = bio_rw_flagged(bio, BIO_RW_BARRIER);
+        do_barriers = bio->bi_rw & REQ_HARDBARRIER;
         if (do_barriers)
                 set_bit(R1BIO_Barrier, &r1_bio->state);
 
@@ -975,8 +975,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                 mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset;
                 mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
                 mbio->bi_end_io = raid1_end_write_request;
-                mbio->bi_rw = WRITE | (do_barriers << BIO_RW_BARRIER) |
-                        (do_sync << BIO_RW_SYNCIO);
+                mbio->bi_rw = WRITE | do_barriers | do_sync;
                 mbio->bi_private = r1_bio;
 
                 if (behind_pages) {
@@ -1633,7 +1632,7 @@ static void raid1d(mddev_t *mddev)
                         sync_request_write(mddev, r1_bio);
                         unplug = 1;
                 } else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) {
-                        /* some requests in the r1bio were BIO_RW_BARRIER
+                        /* some requests in the r1bio were REQ_HARDBARRIER
                          * requests which failed with -EOPNOTSUPP.  Hohumm..
                          * Better resubmit without the barrier.
                          * We know which devices to resubmit for, because
@@ -1641,7 +1640,7 @@ static void raid1d(mddev_t *mddev)
                          * We already have a nr_pending reference on these rdevs.
                          */
                         int i;
-                        const bool do_sync = bio_rw_flagged(r1_bio->master_bio, BIO_RW_SYNCIO);
+                        const bool do_sync = (r1_bio->master_bio->bi_rw & REQ_SYNC);
                         clear_bit(R1BIO_BarrierRetry, &r1_bio->state);
                         clear_bit(R1BIO_Barrier, &r1_bio->state);
                         for (i=0; i < conf->raid_disks; i++)
@@ -1662,8 +1661,7 @@ static void raid1d(mddev_t *mddev)
                                                 conf->mirrors[i].rdev->data_offset;
                                         bio->bi_bdev = conf->mirrors[i].rdev->bdev;
                                         bio->bi_end_io = raid1_end_write_request;
-                                        bio->bi_rw = WRITE |
-                                                (do_sync << BIO_RW_SYNCIO);
+                                        bio->bi_rw = WRITE | do_sync;
                                         bio->bi_private = r1_bio;
                                         r1_bio->bios[i] = bio;
                                         generic_make_request(bio);
@@ -1698,7 +1696,7 @@ static void raid1d(mddev_t *mddev)
                                        (unsigned long long)r1_bio->sector);
                                 raid_end_bio_io(r1_bio);
                         } else {
-                                const bool do_sync = bio_rw_flagged(r1_bio->master_bio, BIO_RW_SYNCIO);
+                                const bool do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC;
                                 r1_bio->bios[r1_bio->read_disk] =
                                         mddev->ro ? IO_BLOCKED : NULL;
                                 r1_bio->read_disk = disk;
@@ -1715,7 +1713,7 @@ static void raid1d(mddev_t *mddev)
                                 bio->bi_sector = r1_bio->sector + rdev->data_offset;
                                 bio->bi_bdev = rdev->bdev;
                                 bio->bi_end_io = raid1_end_read_request;
-                                bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
+                                bio->bi_rw = READ | do_sync;
                                 bio->bi_private = r1_bio;
                                 unplug = 1;
                                 generic_make_request(bio);
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 42e64e4e5e25..62ecb6650fd0 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -799,12 +799,12 @@ static int make_request(mddev_t *mddev, struct bio * bio)
         int i;
         int chunk_sects = conf->chunk_mask + 1;
         const int rw = bio_data_dir(bio);
-        const bool do_sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
+        const bool do_sync = (bio->bi_rw & REQ_SYNC);
         struct bio_list bl;
         unsigned long flags;
         mdk_rdev_t *blocked_rdev;
 
-        if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+        if (unlikely(bio->bi_rw & REQ_HARDBARRIER)) {
                 md_barrier_request(mddev, bio);
                 return 0;
         }
@@ -879,7 +879,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                         mirror->rdev->data_offset;
                 read_bio->bi_bdev = mirror->rdev->bdev;
                 read_bio->bi_end_io = raid10_end_read_request;
-                read_bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
+                read_bio->bi_rw = READ | do_sync;
                 read_bio->bi_private = r10_bio;
 
                 generic_make_request(read_bio);
@@ -947,7 +947,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                         conf->mirrors[d].rdev->data_offset;
                 mbio->bi_bdev = conf->mirrors[d].rdev->bdev;
                 mbio->bi_end_io = raid10_end_write_request;
-                mbio->bi_rw = WRITE | (do_sync << BIO_RW_SYNCIO);
+                mbio->bi_rw = WRITE | do_sync;
                 mbio->bi_private = r10_bio;
 
                 atomic_inc(&r10_bio->remaining);
@@ -1716,7 +1716,7 @@ static void raid10d(mddev_t *mddev)
                                 raid_end_bio_io(r10_bio);
                                 bio_put(bio);
                         } else {
-                                const bool do_sync = bio_rw_flagged(r10_bio->master_bio, BIO_RW_SYNCIO);
+                                const bool do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
                                 bio_put(bio);
                                 rdev = conf->mirrors[mirror].rdev;
                                 if (printk_ratelimit())
@@ -1730,7 +1730,7 @@ static void raid10d(mddev_t *mddev)
                                 bio->bi_sector = r10_bio->devs[r10_bio->read_slot].addr
                                         + rdev->data_offset;
                                 bio->bi_bdev = rdev->bdev;
-                                bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
+                                bio->bi_rw = READ | do_sync;
                                 bio->bi_private = r10_bio;
                                 bio->bi_end_io = raid10_end_read_request;
                                 unplug = 1;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 96c690279fc6..20ac2f14376a 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3958,7 +3958,7 @@ static int make_request(mddev_t *mddev, struct bio * bi)
         const int rw = bio_data_dir(bi);
         int remaining;
 
-        if (unlikely(bio_rw_flagged(bi, BIO_RW_BARRIER))) {
+        if (unlikely(bi->bi_rw & REQ_HARDBARRIER)) {
                 /* Drain all pending writes.  We only really need
                  * to ensure they have been submitted, but this is
                  * easier.
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 8327e248520a..eef78a068fd1 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -18,6 +18,7 @@
 #include <linux/kthread.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/memstick.h>
 
 #define DRIVER_NAME "mspro_block"
@@ -179,6 +180,7 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)
         struct mspro_block_data *msb = disk->private_data;
         int rc = -ENXIO;
 
+        lock_kernel();
         mutex_lock(&mspro_block_disk_lock);
 
         if (msb && msb->card) {
@@ -190,6 +192,7 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)
         }
 
         mutex_unlock(&mspro_block_disk_lock);
+        unlock_kernel();
 
         return rc;
 }
@@ -221,7 +224,11 @@ static int mspro_block_disk_release(struct gendisk *disk)
 
 static int mspro_block_bd_release(struct gendisk *disk, fmode_t mode)
 {
-        return mspro_block_disk_release(disk);
+        int ret;
+        lock_kernel();
+        ret = mspro_block_disk_release(disk);
+        unlock_kernel();
+        return ret;
 }
 
 static int mspro_block_bd_getgeo(struct block_device *bdev,
@@ -805,7 +812,8 @@ static void mspro_block_start(struct memstick_dev *card)
 
 static int mspro_block_prepare_req(struct request_queue *q, struct request *req)
 {
-        if (!blk_fs_request(req) && !blk_pc_request(req)) {
+        if (req->cmd_type != REQ_TYPE_FS &&
+            req->cmd_type != REQ_TYPE_BLOCK_PC) {
                 blk_dump_rq_flags(req, "MSPro unsupported request");
                 return BLKPREP_KILL;
         }
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index fc593fbab696..e6733bc99724 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -53,6 +53,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/i2o.h>
+#include <linux/smp_lock.h>
 
 #include <linux/mempool.h>
 
@@ -577,6 +578,7 @@ static int i2o_block_open(struct block_device *bdev, fmode_t mode)
         if (!dev->i2o_dev)
                 return -ENODEV;
 
+        lock_kernel();
         if (dev->power > 0x1f)
                 i2o_block_device_power(dev, 0x02);
 
@@ -585,6 +587,7 @@ static int i2o_block_open(struct block_device *bdev, fmode_t mode)
         i2o_block_device_lock(dev->i2o_dev, -1);
 
         osm_debug("Ready.\n");
+        unlock_kernel();
 
         return 0;
 };
@@ -615,6 +618,7 @@ static int i2o_block_release(struct gendisk *disk, fmode_t mode)
         if (!dev->i2o_dev)
                 return 0;
 
+        lock_kernel();
         i2o_block_device_flush(dev->i2o_dev);
 
         i2o_block_device_unlock(dev->i2o_dev, -1);
@@ -625,6 +629,7 @@ static int i2o_block_release(struct gendisk *disk, fmode_t mode)
                 operation = 0x24;
 
         i2o_block_device_power(dev, operation);
+        unlock_kernel();
 
         return 0;
 }
@@ -652,30 +657,40 @@ static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode,
 {
         struct gendisk *disk = bdev->bd_disk;
         struct i2o_block_device *dev = disk->private_data;
+        int ret = -ENOTTY;
 
         /* Anyone capable of this syscall can do *real bad* things */
 
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
+        lock_kernel();
         switch (cmd) {
         case BLKI2OGRSTRAT:
-                return put_user(dev->rcache, (int __user *)arg);
+                ret = put_user(dev->rcache, (int __user *)arg);
+                break;
         case BLKI2OGWSTRAT:
-                return put_user(dev->wcache, (int __user *)arg);
+                ret = put_user(dev->wcache, (int __user *)arg);
+                break;
         case BLKI2OSRSTRAT:
+                ret = -EINVAL;
                 if (arg < 0 || arg > CACHE_SMARTFETCH)
-                        return -EINVAL;
+                        break;
                 dev->rcache = arg;
+                ret = 0;
                 break;
         case BLKI2OSWSTRAT:
+                ret = -EINVAL;
                 if (arg != 0
                     && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK))
-                        return -EINVAL;
+                        break;
                 dev->wcache = arg;
+                ret = 0;
                 break;
         }
-        return -ENOTTY;
+        unlock_kernel();
+
+        return ret;
 };
 
 /**
@@ -883,7 +898,7 @@ static void i2o_block_request_fn(struct request_queue *q)
                 if (!req)
                         break;
 
-                if (blk_fs_request(req)) {
+                if (req->cmd_type == REQ_TYPE_FS) {
                         struct i2o_block_delayed_request *dreq;
                         struct i2o_block_request *ireq = req->special;
                         unsigned int queue_depth;
@@ -930,7 +945,8 @@ static const struct block_device_operations i2o_block_fops = {
         .owner = THIS_MODULE,
         .open = i2o_block_open,
         .release = i2o_block_release,
-        .locked_ioctl = i2o_block_ioctl,
+        .ioctl = i2o_block_ioctl,
+        .compat_ioctl = i2o_block_ioctl,
         .getgeo = i2o_block_getgeo,
         .media_changed = i2o_block_media_changed
 };
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index cb9fbc83b090..8433cde29c8b 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -29,6 +29,7 @@
 #include <linux/kdev_t.h>
 #include <linux/blkdev.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/scatterlist.h>
 #include <linux/string_helpers.h>
 
@@ -107,6 +108,7 @@ static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
         int ret = -ENXIO;
 
+        lock_kernel();
         if (md) {
                 if (md->usage == 2)
                         check_disk_change(bdev);
@@ -117,6 +119,7 @@ static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
                         ret = -EROFS;
                 }
         }
+        unlock_kernel();
 
         return ret;
 }
@@ -125,7 +128,9 @@ static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 {
         struct mmc_blk_data *md = disk->private_data;
 
+        lock_kernel();
         mmc_blk_put(md);
+        unlock_kernel();
         return 0;
 }
 
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index d6ded247d941..c77eb49eda0e 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -32,7 +32,7 @@ static int mmc_prep_request(struct request_queue *q, struct request *req)
         /*
          * We only like normal block requests.
          */
-        if (!blk_fs_request(req)) {
+        if (req->cmd_type != REQ_TYPE_FS) {
                 blk_dump_rq_flags(req, "MMC bad request");
                 return BLKPREP_KILL;
         }
@@ -128,7 +128,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
         mq->req = NULL;
 
         blk_queue_prep_rq(mq->queue, mmc_prep_request);
-        blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN, NULL);
+        blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN);
         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
 
 #ifdef CONFIG_MMC_BLOCK_BOUNCE
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 1d2144d77470..62e68707b07f 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -29,6 +29,7 @@
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/spinlock.h>
+#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
@@ -87,14 +88,14 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 
         buf = req->buffer;
 
-        if (!blk_fs_request(req))
+        if (req->cmd_type != REQ_TYPE_FS)
                 return -EIO;
 
         if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
             get_capacity(req->rq_disk))
                 return -EIO;
 
-        if (blk_discard_rq(req))
+        if (req->cmd_flags & REQ_DISCARD)
                 return tr->discard(dev, block, nsect);
 
         switch(rq_data_dir(req)) {
@@ -178,8 +179,9 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
         int ret;
 
         if (!dev)
-                return -ERESTARTSYS;
+                return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
+        lock_kernel();
         mutex_lock(&dev->lock);
 
         if (!dev->mtd) {
@@ -196,6 +198,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 unlock:
         mutex_unlock(&dev->lock);
         blktrans_dev_put(dev);
+        unlock_kernel();
         return ret;
 }
 
@@ -207,6 +210,7 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
         if (!dev)
                 return ret;
 
+        lock_kernel();
         mutex_lock(&dev->lock);
 
         /* Release one reference, we sure its not the last one here*/
@@ -219,6 +223,7 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
 unlock:
         mutex_unlock(&dev->lock);
         blktrans_dev_put(dev);
+        unlock_kernel();
         return ret;
 }
 
@@ -251,6 +256,7 @@ static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
         if (!dev)
                 return ret;
 
+        lock_kernel();
         mutex_lock(&dev->lock);
 
         if (!dev->mtd)
@@ -265,6 +271,7 @@ static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
         }
 unlock:
         mutex_unlock(&dev->lock);
+        unlock_kernel();
         blktrans_dev_put(dev);
         return ret;
 }
@@ -273,7 +280,7 @@ static const struct block_device_operations mtd_blktrans_ops = {
         .owner          = THIS_MODULE,
         .open           = blktrans_open,
         .release        = blktrans_release,
-        .locked_ioctl   = blktrans_ioctl,
+        .ioctl          = blktrans_ioctl,
         .getgeo         = blktrans_getgeo,
 };
 
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 33975e922d65..1a84fae155e1 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -21,6 +21,7 @@
 #include <linux/hdreg.h>
 #include <linux/async.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 
 #include <asm/ccwdev.h>
 #include <asm/ebcdic.h>
@@ -2196,7 +2197,7 @@ static void dasd_setup_queue(struct dasd_block *block)
          */
         blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
         blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
-        blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL);
+        blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN);
 }
 
 /*
@@ -2235,6 +2236,7 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
         if (!block)
                 return -ENODEV;
 
+        lock_kernel();
         base = block->base;
         atomic_inc(&block->open_count);
         if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
@@ -2269,12 +2271,14 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
                 goto out;
         }
 
+        unlock_kernel();
         return 0;
 
 out:
         module_put(base->discipline->owner);
 unlock:
         atomic_dec(&block->open_count);
+        unlock_kernel();
         return rc;
 }
 
@@ -2282,8 +2286,10 @@ static int dasd_release(struct gendisk *disk, fmode_t mode)
 {
         struct dasd_block *block = disk->private_data;
 
+        lock_kernel();
         atomic_dec(&block->open_count);
         module_put(block->base->discipline->owner);
+        unlock_kernel();
         return 0;
 }
 
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 9b43ae94beba..2bd72aa34c59 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
@@ -775,6 +776,7 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
         struct dcssblk_dev_info *dev_info;
         int rc;
 
+        lock_kernel();
         dev_info = bdev->bd_disk->private_data;
         if (NULL == dev_info) {
                 rc = -ENODEV;
@@ -784,6 +786,7 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
         bdev->bd_block_size = 4096;
         rc = 0;
 out:
+        unlock_kernel();
         return rc;
 }
 
@@ -794,6 +797,7 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
         struct segment_info *entry;
         int rc;
 
+        lock_kernel();
         if (!dev_info) {
                 rc = -ENODEV;
                 goto out;
@@ -811,6 +815,7 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
         up_write(&dcssblk_devices_sem);
         rc = 0;
 out:
+        unlock_kernel();
         return rc;
 }
 
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 097da8ce6be6..b7de02525ec9 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/interrupt.h>
 #include <linux/buffer_head.h>
 #include <linux/kernel.h>
@@ -361,6 +362,7 @@ tapeblock_open(struct block_device *bdev, fmode_t mode)
         struct tape_device *    device;
         int                     rc;
 
+        lock_kernel();
         device = tape_get_device(disk->private_data);
 
         if (device->required_tapemarks) {
@@ -384,12 +386,14 @@ tapeblock_open(struct block_device *bdev, fmode_t mode)
          *       is called.
          */
         tape_state_set(device, TS_BLKUSE);
+        unlock_kernel();
         return 0;
 
 release:
         tape_release(device);
  put_device:
         tape_put_device(device);
+        unlock_kernel();
         return rc;
 }
 
@@ -403,10 +407,12 @@ static int
 tapeblock_release(struct gendisk *disk, fmode_t mode)
 {
         struct tape_device *device = disk->private_data;
-
+ 
+        lock_kernel();
         tape_state_set(device, TS_IN_USE);
         tape_release(device);
         tape_put_device(device);
+        unlock_kernel();
 
         return 0;
 }
diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index 2a8cf137f609..4f785f254c1f 100644
--- a/drivers/scsi/aha1542.c
+++ b/drivers/scsi/aha1542.c
@@ -52,22 +52,6 @@
 #define SCSI_BUF_PA(address)    isa_virt_to_bus(address)
 #define SCSI_SG_PA(sgent)       (isa_page_to_bus(sg_page((sgent))) + (sgent)->offset)
 
-static void BAD_SG_DMA(Scsi_Cmnd * SCpnt,
-                       struct scatterlist *sgp,
-                       int nseg,
-                       int badseg)
-{
-        printk(KERN_CRIT "sgpnt[%d:%d] page %p/0x%llx length %u\n",
-               badseg, nseg, sg_virt(sgp),
-               (unsigned long long)SCSI_SG_PA(sgp),
-               sgp->length);
-
-        /*
-         * Not safe to continue.
-         */
-        panic("Buffer at physical address > 16Mb used for aha1542");
-}
-
 #include<linux/stat.h>
 
 #ifdef DEBUG
@@ -691,8 +675,6 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
                 }
                 scsi_for_each_sg(SCpnt, sg, sg_count, i) {
                         any2scsi(cptr[i].dataptr, SCSI_SG_PA(sg));
-                        if (SCSI_SG_PA(sg) + sg->length - 1 > ISA_DMA_THRESHOLD)
-                                BAD_SG_DMA(SCpnt, scsi_sglist(SCpnt), sg_count, i);
                         any2scsi(cptr[i].datalen, sg->length);
                 };
                 any2scsi(ccb[mbo].datalen, sg_count * sizeof(struct chain));
@@ -1133,16 +1115,9 @@ static int __init aha1542_detect(struct scsi_host_template * tpnt)
                                 release_region(bases[indx], 4);
                                 continue;
                         }
-                        /* For now we do this - until kmalloc is more intelligent
-                           we are resigned to stupid hacks like this */
-                        if (SCSI_BUF_PA(shpnt) >= ISA_DMA_THRESHOLD) {
-                                printk(KERN_ERR "Invalid address for shpnt with 1542.\n");
-                                goto unregister;
-                        }
                         if (!aha1542_test_port(bases[indx], shpnt))
                                 goto unregister;
 
-
                         base_io = bases[indx];
 
                         /* Set the Bus on/off-times as not to ruin floppy performance */
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index ee4b6914667f..fda4de3440c4 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -716,7 +716,7 @@ static int _osd_req_list_objects(struct osd_request *or,
                 return PTR_ERR(bio);
         }
 
-        bio->bi_rw &= ~(1 << BIO_RW);
+        bio->bi_rw &= ~REQ_WRITE;
         or->in.bio = bio;
         or->in.total_bytes = bio->bi_size;
         return 0;
@@ -814,7 +814,7 @@ void osd_req_write(struct osd_request *or,
 {
         _osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, len);
         WARN_ON(or->out.bio || or->out.total_bytes);
-        WARN_ON(0 ==  bio_rw_flagged(bio, BIO_RW));
+        WARN_ON(0 == (bio->bi_rw & REQ_WRITE));
         or->out.bio = bio;
         or->out.total_bytes = len;
 }
@@ -829,7 +829,7 @@ int osd_req_write_kern(struct osd_request *or,
         if (IS_ERR(bio))
                 return PTR_ERR(bio);
 
-        bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
+        bio->bi_rw |= REQ_WRITE; /* FIXME: bio_set_dir() */
         osd_req_write(or, obj, offset, bio, len);
         return 0;
 }
@@ -865,7 +865,7 @@ void osd_req_read(struct osd_request *or,
 {
         _osd_req_encode_common(or, OSD_ACT_READ, obj, offset, len);
         WARN_ON(or->in.bio || or->in.total_bytes);
-        WARN_ON(1 == bio_rw_flagged(bio, BIO_RW));
+        WARN_ON(1 == (bio->bi_rw & REQ_WRITE));
         or->in.bio = bio;
         or->in.total_bytes = len;
 }
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 2bf98469dc4c..bbbc186dbc1a 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -320,7 +320,7 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
                                     "changed. The Linux SCSI layer does not "
                                     "automatically adjust these parameters.\n");
 
-                if (blk_barrier_rq(scmd->request))
+                if (scmd->request->cmd_flags & REQ_HARDBARRIER)
                         /*
                          * barrier requests should always retry on UA
                          * otherwise block will get a spurious error
@@ -1331,16 +1331,16 @@ int scsi_noretry_cmd(struct scsi_cmnd *scmd)
         case DID_OK:
                 break;
         case DID_BUS_BUSY:
-                return blk_failfast_transport(scmd->request);
+                return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT);
         case DID_PARITY:
-                return blk_failfast_dev(scmd->request);
+                return (scmd->request->cmd_flags & REQ_FAILFAST_DEV);
         case DID_ERROR:
                 if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
                     status_byte(scmd->result) == RESERVATION_CONFLICT)
                         return 0;
                 /* fall through */
         case DID_SOFT_ERROR:
-                return blk_failfast_driver(scmd->request);
+                return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER);
         }
 
         switch (status_byte(scmd->result)) {
@@ -1349,7 +1349,9 @@ int scsi_noretry_cmd(struct scsi_cmnd *scmd)
                  * assume caller has checked sense and determinted
                  * the check condition was retryable.
                  */
-                return blk_failfast_dev(scmd->request);
+                if (scmd->request->cmd_flags & REQ_FAILFAST_DEV ||
+                    scmd->request->cmd_type == REQ_TYPE_BLOCK_PC)
+                        return 1;
         }
 
         return 0;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 1646fe7cbd4b..b8de389636f8 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -85,7 +85,7 @@ static void scsi_unprep_request(struct request *req)
 {
         struct scsi_cmnd *cmd = req->special;
 
-        req->cmd_flags &= ~REQ_DONTPREP;
+        blk_unprep_request(req);
         req->special = NULL;
 
         scsi_put_command(cmd);
@@ -722,7 +722,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
                         sense_deferred = scsi_sense_is_deferred(&sshdr);
         }
 
-        if (blk_pc_request(req)) { /* SG_IO ioctl from block level */
+        if (req->cmd_type == REQ_TYPE_BLOCK_PC) { /* SG_IO ioctl from block level */
                 req->errors = result;
                 if (result) {
                         if (sense_valid && req->sense) {
@@ -757,7 +757,8 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
                 }
         }
 
-        BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
+        /* no bidi support for !REQ_TYPE_BLOCK_PC yet */
+        BUG_ON(blk_bidi_rq(req));
 
         /*
          * Next deal with any sectors which we were able to correctly
@@ -1010,11 +1011,8 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 
 err_exit:
         scsi_release_buffers(cmd);
-        if (error == BLKPREP_KILL)
-                scsi_put_command(cmd);
-        else /* BLKPREP_DEFER */
-                scsi_unprep_request(cmd->request);
-
+        scsi_put_command(cmd);
+        cmd->request->special = NULL;
         return error;
 }
 EXPORT_SYMBOL(scsi_init_io);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index cc8a1d1d915a..8e2e893db9e7 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -46,6 +46,7 @@
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/delay.h>
+#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/string_helpers.h>
 #include <linux/async.h>
@@ -411,54 +412,85 @@ static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
 }
 
 /**
- * sd_prepare_discard - unmap blocks on thinly provisioned device
+ * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
+ * @sdp: scsi device to operate one
  * @rq: Request to prepare
  *
  * Will issue either UNMAP or WRITE SAME(16) depending on preference
  * indicated by target device.
  **/
-static int sd_prepare_discard(struct request *rq)
+static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
 {
         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
         struct bio *bio = rq->bio;
         sector_t sector = bio->bi_sector;
-        unsigned int num = bio_sectors(bio);
+        unsigned int nr_sectors = bio_sectors(bio);
+        unsigned int len;
+        int ret;
+        struct page *page;
 
         if (sdkp->device->sector_size == 4096) {
                 sector >>= 3;
-                num >>= 3;
+                nr_sectors >>= 3;
         }
 
-        rq->cmd_type = REQ_TYPE_BLOCK_PC;
         rq->timeout = SD_TIMEOUT;
 
         memset(rq->cmd, 0, rq->cmd_len);
 
+        page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
+        if (!page)
+                return BLKPREP_DEFER;
+
         if (sdkp->unmap) {
-                char *buf = kmap_atomic(bio_page(bio), KM_USER0);
+                char *buf = page_address(page);
 
+                rq->cmd_len = 10;
                 rq->cmd[0] = UNMAP;
                 rq->cmd[8] = 24;
-                rq->cmd_len = 10;
-
-                /* Ensure that data length matches payload */
-                rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24;
 
                 put_unaligned_be16(6 + 16, &buf[0]);
                 put_unaligned_be16(16, &buf[2]);
                 put_unaligned_be64(sector, &buf[8]);
-                put_unaligned_be32(num, &buf[16]);
+                put_unaligned_be32(nr_sectors, &buf[16]);
 
-                kunmap_atomic(buf, KM_USER0);
+                len = 24;
         } else {
+                rq->cmd_len = 16;
                 rq->cmd[0] = WRITE_SAME_16;
                 rq->cmd[1] = 0x8; /* UNMAP */
                 put_unaligned_be64(sector, &rq->cmd[2]);
-                put_unaligned_be32(num, &rq->cmd[10]);
-                rq->cmd_len = 16;
+                put_unaligned_be32(nr_sectors, &rq->cmd[10]);
+
+                len = sdkp->device->sector_size;
         }
 
-        return BLKPREP_OK;
+        blk_add_request_payload(rq, page, len);
+        ret = scsi_setup_blk_pc_cmnd(sdp, rq);
+        rq->buffer = page_address(page);
+        if (ret != BLKPREP_OK) {
+                __free_page(page);
+                rq->buffer = NULL;
+        }
+        return ret;
+}
+
+static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
+{
+        rq->timeout = SD_TIMEOUT;
+        rq->retries = SD_MAX_RETRIES;
+        rq->cmd[0] = SYNCHRONIZE_CACHE;
+        rq->cmd_len = 10;
+
+        return scsi_setup_blk_pc_cmnd(sdp, rq);
+}
+
+static void sd_unprep_fn(struct request_queue *q, struct request *rq)
+{
+        if (rq->cmd_flags & REQ_DISCARD) {
+                free_page((unsigned long)rq->buffer);
+                rq->buffer = NULL;
+        }
 }
 
 /**
@@ -485,10 +517,13 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
          * Discard request come in as REQ_TYPE_FS but we turn them into
          * block PC requests to make life easier.
          */
-        if (blk_discard_rq(rq))
-                ret = sd_prepare_discard(rq);
-
-        if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
+        if (rq->cmd_flags & REQ_DISCARD) {
+                ret = scsi_setup_discard_cmnd(sdp, rq);
+                goto out;
+        } else if (rq->cmd_flags & REQ_FLUSH) {
+                ret = scsi_setup_flush_cmnd(sdp, rq);
+                goto out;
+        } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
                 goto out;
         } else if (rq->cmd_type != REQ_TYPE_FS) {
@@ -636,7 +671,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
                 SCpnt->cmnd[7] = 0x18;
                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
-                SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
+                SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
 
                 /* LBA */
                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
@@ -661,7 +696,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
         } else if (block > 0xffffffff) {
                 SCpnt->cmnd[0] += READ_16 - READ_6;
-                SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
+                SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
@@ -682,7 +717,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
                         this_count = 0xffff;
 
                 SCpnt->cmnd[0] += READ_10 - READ_6;
-                SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
+                SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
@@ -691,7 +726,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
         } else {
-                if (unlikely(blk_fua_rq(rq))) {
+                if (unlikely(rq->cmd_flags & REQ_FUA)) {
                         /*
                          * This happens only if this drive failed
                          * 10byte rw command with ILLEGAL_REQUEST
@@ -745,6 +780,8 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
  *      or from within the kernel (e.g. as a result of a mount(1) ).
  *      In the latter case @inode and @filp carry an abridged amount
  *      of information as noted above.
+ *
+ *      Locking: called with bdev->bd_mutex held.
  **/
 static int sd_open(struct block_device *bdev, fmode_t mode)
 {
@@ -799,7 +836,7 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
         if (!scsi_device_online(sdev))
                 goto error_out;
 
-        if (!sdkp->openers++ && sdev->removable) {
+        if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
                 if (scsi_block_when_processing_errors(sdev))
                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
         }
@@ -823,6 +860,8 @@ error_autopm:
  *
  *      Note: may block (uninterruptible) if error recovery is underway
  *      on this disk.
+ *
+ *      Locking: called with bdev->bd_mutex held.
  **/
 static int sd_release(struct gendisk *disk, fmode_t mode)
 {
@@ -831,7 +870,7 @@ static int sd_release(struct gendisk *disk, fmode_t mode)
 
         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
 
-        if (!--sdkp->openers && sdev->removable) {
+        if (atomic_dec_return(&sdkp->openers) && sdev->removable) {
                 if (scsi_block_when_processing_errors(sdev))
                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
         }
@@ -904,7 +943,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
         error = scsi_nonblockable_ioctl(sdp, cmd, p,
                                         (mode & FMODE_NDELAY) != 0);
         if (!scsi_block_when_processing_errors(sdp) || !error)
-                return error;
+                goto out;
 
         /*
          * Send SCSI addressing ioctls directly to mid level, send other
@@ -914,13 +953,17 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
         switch (cmd) {
                 case SCSI_IOCTL_GET_IDLUN:
                 case SCSI_IOCTL_GET_BUS_NUMBER:
-                        return scsi_ioctl(sdp, cmd, p);
+                        error = scsi_ioctl(sdp, cmd, p);
+                        break;
                 default:
                         error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
                         if (error != -ENOTTY)
-                                return error;
+                                break;
+                        error = scsi_ioctl(sdp, cmd, p);
+                        break;
         }
-        return scsi_ioctl(sdp, cmd, p);
+out:
+        return error;
 }
 
 static void set_media_not_present(struct scsi_disk *sdkp)
@@ -1045,15 +1088,6 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
         return 0;
 }
 
-static void sd_prepare_flush(struct request_queue *q, struct request *rq)
-{
-        rq->cmd_type = REQ_TYPE_BLOCK_PC;
-        rq->timeout = SD_TIMEOUT;
-        rq->retries = SD_MAX_RETRIES;
-        rq->cmd[0] = SYNCHRONIZE_CACHE;
-        rq->cmd_len = 10;
-}
-
 static void sd_rescan(struct device *dev)
 {
         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
@@ -1103,7 +1137,7 @@ static const struct block_device_operations sd_fops = {
         .owner                  = THIS_MODULE,
         .open                   = sd_open,
         .release                = sd_release,
-        .locked_ioctl           = sd_ioctl,
+        .ioctl                  = sd_ioctl,
         .getgeo                 = sd_getgeo,
 #ifdef CONFIG_COMPAT
         .compat_ioctl           = sd_compat_ioctl,
@@ -1120,7 +1154,7 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
         u64 bad_lba;
         int info_valid;
 
-        if (!blk_fs_request(scmd->request))
+        if (scmd->request->cmd_type != REQ_TYPE_FS)
                 return 0;
 
         info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
@@ -1171,6 +1205,12 @@ static int sd_done(struct scsi_cmnd *SCpnt)
         int sense_valid = 0;
         int sense_deferred = 0;
 
+        if (SCpnt->request->cmd_flags & REQ_DISCARD) {
+                if (!result)
+                        scsi_set_resid(SCpnt, 0);
+                return good_bytes;
+        }
+
         if (result) {
                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
                 if (sense_valid)
@@ -2121,7 +2161,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
         else
                 ordered = QUEUE_ORDERED_DRAIN;
 
-        blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
+        blk_queue_ordered(sdkp->disk->queue, ordered);
 
         set_capacity(disk, sdkp->capacity);
         kfree(buffer);
@@ -2234,6 +2274,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
         sd_revalidate_disk(gd);
 
         blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
+        blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
 
         gd->driverfs_dev = &sdp->sdev_gendev;
         gd->flags = GENHD_FL_EXT_DEVT;
@@ -2313,7 +2354,7 @@ static int sd_probe(struct device *dev)
         sdkp->driver = &sd_template;
         sdkp->disk = gd;
         sdkp->index = index;
-        sdkp->openers = 0;
+        atomic_set(&sdkp->openers, 0);
         sdkp->previous_state = 1;
 
         if (!sdp->request_queue->rq_timeout) {
@@ -2372,6 +2413,7 @@ static int sd_remove(struct device *dev)
 
         async_synchronize_full();
         blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
+        blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
         device_del(&sdkp->dev);
         del_gendisk(sdkp->disk);
         sd_shutdown(dev);
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 43d3caf268ef..f81a9309e6de 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -47,7 +47,7 @@ struct scsi_disk {
         struct scsi_device *device;
         struct device   dev;
         struct gendisk  *disk;
-        unsigned int    openers;        /* protected by BKL for now, yuck */
+        atomic_t        openers;
         sector_t        capacity;       /* size in 512-byte sectors */
         u32             index;
         unsigned short  hw_sector_size;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 0a90abc7f140..ba9c3e0387ce 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -44,6 +44,7 @@
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <asm/uaccess.h>
 
@@ -466,22 +467,27 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
 
 static int sr_block_open(struct block_device *bdev, fmode_t mode)
 {
-        struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk);
+        struct scsi_cd *cd;
         int ret = -ENXIO;
 
+        lock_kernel();
+        cd = scsi_cd_get(bdev->bd_disk);
         if (cd) {
                 ret = cdrom_open(&cd->cdi, bdev, mode);
                 if (ret)
                         scsi_cd_put(cd);
         }
+        unlock_kernel();
         return ret;
 }
 
 static int sr_block_release(struct gendisk *disk, fmode_t mode)
 {
         struct scsi_cd *cd = scsi_cd(disk);
+        lock_kernel();
         cdrom_release(&cd->cdi, mode);
         scsi_cd_put(cd);
+        unlock_kernel();
         return 0;
 }
 
@@ -493,6 +499,8 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
         void __user *argp = (void __user *)arg;
         int ret;
 
+        lock_kernel();
+
         /*
          * Send SCSI addressing ioctls directly to mid level, send other
          * ioctls to cdrom/block level.
@@ -500,12 +508,13 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
         switch (cmd) {
         case SCSI_IOCTL_GET_IDLUN:
         case SCSI_IOCTL_GET_BUS_NUMBER:
-                return scsi_ioctl(sdev, cmd, argp);
+                ret = scsi_ioctl(sdev, cmd, argp);
+                goto out;
         }
 
         ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
         if (ret != -ENOSYS)
-                return ret;
+                goto out;
 
         /*
          * ENODEV means that we didn't recognise the ioctl, or that we
@@ -516,8 +525,12 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
         ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
                                         (mode & FMODE_NDELAY) != 0);
         if (ret != -ENODEV)
-                return ret;
-        return scsi_ioctl(sdev, cmd, argp);
+                goto out;
+        ret = scsi_ioctl(sdev, cmd, argp);
+
+out:
+        unlock_kernel();
+        return ret;
 }
 
 static int sr_block_media_changed(struct gendisk *disk)
@@ -531,7 +544,7 @@ static const struct block_device_operations sr_bdops =
         .owner          = THIS_MODULE,
         .open           = sr_block_open,
         .release        = sr_block_release,
-        .locked_ioctl   = sr_block_ioctl,
+        .ioctl          = sr_block_ioctl,
         .media_changed  = sr_block_media_changed,
         /* 
          * No compat_ioctl for now because sr_block_ioctl never
diff --git a/drivers/scsi/sun3_NCR5380.c b/drivers/scsi/sun3_NCR5380.c
index b5838d547c68..713620ed70d9 100644
--- a/drivers/scsi/sun3_NCR5380.c
+++ b/drivers/scsi/sun3_NCR5380.c
@@ -2022,7 +2022,7 @@ static void NCR5380_information_transfer (struct Scsi_Host *instance)
                 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
                                                   != cmd))
                 {
-                        if(blk_fs_request(cmd->request)) {
+                        if (cmd->request->cmd_type == REQ_TYPE_FS) {
                                 sun3scsi_dma_setup(d, count,
                                                    rq_data_dir(cmd->request));
                                 sun3_dma_setup_done = cmd;
diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
index e606cf0a2eb7..613f5880d135 100644
--- a/drivers/scsi/sun3_scsi.c
+++ b/drivers/scsi/sun3_scsi.c
@@ -524,7 +524,7 @@ static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
                                                   struct scsi_cmnd *cmd,
                                                   int write_flag)
 {
-        if(blk_fs_request(cmd->request))
+        if (cmd->request->cmd_type == REQ_TYPE_FS)
                 return wanted;
         else
                 return 0;
diff --git a/drivers/scsi/sun3_scsi_vme.c b/drivers/scsi/sun3_scsi_vme.c
index aaa4fd0dd1b9..7c526b8e30ac 100644
--- a/drivers/scsi/sun3_scsi_vme.c
+++ b/drivers/scsi/sun3_scsi_vme.c
@@ -458,7 +458,7 @@ static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
                                                   struct scsi_cmnd *cmd,
                                                   int write_flag)
 {
-        if(blk_fs_request(cmd->request))
+        if (cmd->request->cmd_type == REQ_TYPE_FS)
                 return wanted;
         else
                 return 0;
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index f7ea2a3efed7..ff1d24720f11 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -25,6 +25,7 @@
 #include <linux/major.h>
 #include <linux/delay.h>
 #include <linux/hdreg.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -805,7 +806,8 @@ static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
                         blkvsc_req->cmnd[0] = READ_16;
                 }
 
-                blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0;
+                blkvsc_req->cmnd[1] |=
+                        (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
 
                 *(unsigned long long *)&blkvsc_req->cmnd[2] =
                                 cpu_to_be64(blkvsc_req->sector_start);
@@ -821,7 +823,8 @@ static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
                         blkvsc_req->cmnd[0] = READ_10;
                 }
 
-                blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0;
+                blkvsc_req->cmnd[1] |=
+                        (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
 
                 *(unsigned int *)&blkvsc_req->cmnd[2] =
                                 cpu_to_be32(blkvsc_req->sector_start);
@@ -1268,7 +1271,7 @@ static void blkvsc_request(struct request_queue *queue)
                 DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
 
                 blkdev = req->rq_disk->private_data;
-                if (blkdev->shutting_down || !blk_fs_request(req) ||
+                if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS ||
                     blkdev->media_not_present) {
                         __blk_end_request_cur(req, 0);
                         continue;
@@ -1306,6 +1309,7 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
         DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
                    blkdev->gd->disk_name);
 
+        lock_kernel();
         spin_lock(&blkdev->lock);
 
         if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
@@ -1317,6 +1321,7 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
         blkdev->users++;
 
         spin_unlock(&blkdev->lock);
+        unlock_kernel();
         return 0;
 }
 
@@ -1327,6 +1332,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
         DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
                    blkdev->gd->disk_name);
 
+        lock_kernel();
         spin_lock(&blkdev->lock);
         if (blkdev->users == 1) {
                 spin_unlock(&blkdev->lock);
@@ -1337,6 +1343,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
         blkdev->users--;
 
         spin_unlock(&blkdev->lock);
+        unlock_kernel();
         return 0;
 }
 
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index 7b3e973a1aee..7e49527189b6 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -133,17 +133,12 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev,
 }
 EXPORT_SYMBOL_GPL(xenbus_watch_pathfmt);
 
+static void xenbus_switch_fatal(struct xenbus_device *, int, int,
+                                const char *, ...);
 
-/**
- * xenbus_switch_state
- * @dev: xenbus device
- * @state: new state
- *
- * Advertise in the store a change of the given driver to the given new_state.
- * Return 0 on success, or -errno on error.  On error, the device will switch
- * to XenbusStateClosing, and the error will be saved in the store.
- */
-int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state state)
+static int
+__xenbus_switch_state(struct xenbus_device *dev,
+                      enum xenbus_state state, int depth)
 {
         /* We check whether the state is currently set to the given value, and
            if not, then the state is set.  We don't want to unconditionally
@@ -152,35 +147,65 @@ int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state state)
            to it, as the device will be tearing down, and we don't want to
            resurrect that directory.
 
-           Note that, because of this cached value of our state, this function
-           will not work inside a Xenstore transaction (something it was
-           trying to in the past) because dev->state would not get reset if
-           the transaction was aborted.
-
+           Note that, because of this cached value of our state, this
+           function will not take a caller's Xenstore transaction
+           (something it was trying to in the past) because dev->state
+           would not get reset if the transaction was aborted.
          */
 
+        struct xenbus_transaction xbt;
         int current_state;
-        int err;
+        int err, abort;
 
         if (state == dev->state)
                 return 0;
 
-        err = xenbus_scanf(XBT_NIL, dev->nodename, "state", "%d",
-                           &current_state);
-        if (err != 1)
+again:
+        abort = 1;
+
+        err = xenbus_transaction_start(&xbt);
+        if (err) {
+                xenbus_switch_fatal(dev, depth, err, "starting transaction");
                 return 0;
+        }
+
+        err = xenbus_scanf(xbt, dev->nodename, "state", "%d", &current_state);
+        if (err != 1)
+                goto abort;
 
-        err = xenbus_printf(XBT_NIL, dev->nodename, "state", "%d", state);
+        err = xenbus_printf(xbt, dev->nodename, "state", "%d", state);
         if (err) {
-                if (state != XenbusStateClosing) /* Avoid looping */
-                        xenbus_dev_fatal(dev, err, "writing new state");
-                return err;
+                xenbus_switch_fatal(dev, depth, err, "writing new state");
+                goto abort;
         }
 
-        dev->state = state;
+        abort = 0;
+abort:
+        err = xenbus_transaction_end(xbt, abort);
+        if (err) {
+                if (err == -EAGAIN && !abort)
+                        goto again;
+                xenbus_switch_fatal(dev, depth, err, "ending transaction");
+        } else
+                dev->state = state;
 
         return 0;
 }
+
+/**
+ * xenbus_switch_state
+ * @dev: xenbus device
+ * @state: new state
+ *
+ * Advertise in the store a change of the given driver to the given new_state.
+ * Return 0 on success, or -errno on error.  On error, the device will switch
+ * to XenbusStateClosing, and the error will be saved in the store.
+ */
+int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state state)
+{
+        return __xenbus_switch_state(dev, state, 0);
+}
+
 EXPORT_SYMBOL_GPL(xenbus_switch_state);
 
 int xenbus_frontend_closed(struct xenbus_device *dev)
@@ -284,6 +309,23 @@ void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...)
 EXPORT_SYMBOL_GPL(xenbus_dev_fatal);
 
 /**
+ * Equivalent to xenbus_dev_fatal(dev, err, fmt, args), but helps
+ * avoiding recursion within xenbus_switch_state.
+ */
+static void xenbus_switch_fatal(struct xenbus_device *dev, int depth, int err,
+                                const char *fmt, ...)
+{
+        va_list ap;
+
+        va_start(ap, fmt);
+        xenbus_va_dev_error(dev, err, fmt, ap);
+        va_end(ap);
+
+        if (!depth)
+                __xenbus_switch_state(dev, XenbusStateClosing, 1);
+}
+
+/**
  * xenbus_grant_ring
  * @dev: xenbus device
  * @ring_mfn: mfn of ring to grant
diff --git a/fs/bio.c b/fs/bio.c
index e7bf6ca64dcf..8abb2dfb2e7c 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -843,7 +843,8 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
         if (!bio)
                 goto out_bmd;
 
-        bio->bi_rw |= (!write_to_vm << BIO_RW);
+        if (!write_to_vm)
+                bio->bi_rw |= REQ_WRITE;
 
         ret = 0;
 
@@ -1024,7 +1025,7 @@ static struct bio *__bio_map_user_iov(struct request_queue *q,
          * set data direction, and check if mapped pages need bouncing
          */
         if (!write_to_vm)
-                bio->bi_rw |= (1 << BIO_RW);
+                bio->bi_rw |= REQ_WRITE;
 
         bio->bi_bdev = bdev;
         bio->bi_flags |= (1 << BIO_USER_MAPPED);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 451afbd543b5..66411463b734 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1346,13 +1346,12 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                 return ret;
         }
 
-        lock_kernel();
  restart:
 
         ret = -ENXIO;
         disk = get_gendisk(bdev->bd_dev, &partno);
         if (!disk)
-                goto out_unlock_kernel;
+                goto out;
 
         mutex_lock_nested(&bdev->bd_mutex, for_part);
         if (!bdev->bd_openers) {
@@ -1432,7 +1431,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
         if (for_part)
                 bdev->bd_part_count++;
         mutex_unlock(&bdev->bd_mutex);
-        unlock_kernel();
         return 0;
 
  out_clear:
@@ -1445,9 +1443,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
         bdev->bd_contains = NULL;
  out_unlock_bdev:
         mutex_unlock(&bdev->bd_mutex);
- out_unlock_kernel:
-        unlock_kernel();
-
+ out:
         if (disk)
                 module_put(disk->fops->owner);
         put_disk(disk);
@@ -1516,7 +1512,6 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
         struct block_device *victim = NULL;
 
         mutex_lock_nested(&bdev->bd_mutex, for_part);
-        lock_kernel();
         if (for_part)
                 bdev->bd_part_count--;
 
@@ -1541,7 +1536,6 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
                         victim = bdev->bd_contains;
                 bdev->bd_contains = NULL;
         }
-        unlock_kernel();
         mutex_unlock(&bdev->bd_mutex);
         bdput(bdev);
         if (victim)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 34f7c375567e..64f10082f048 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -480,7 +480,7 @@ static void end_workqueue_bio(struct bio *bio, int err)
         end_io_wq->work.func = end_workqueue_fn;
         end_io_wq->work.flags = 0;
 
-        if (bio->bi_rw & (1 << BIO_RW)) {
+        if (bio->bi_rw & REQ_WRITE) {
                 if (end_io_wq->metadata)
                         btrfs_queue_worker(&fs_info->endio_meta_write_workers,
                                            &end_io_wq->work);
@@ -604,7 +604,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 
         atomic_inc(&fs_info->nr_async_submits);
 
-        if (rw & (1 << BIO_RW_SYNCIO))
+        if (rw & REQ_SYNC)
                 btrfs_set_work_high_prio(&async->work);
 
         btrfs_queue_worker(&fs_info->workers, &async->work);
@@ -668,7 +668,7 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
                                           bio, 1);
         BUG_ON(ret);
 
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 /*
                  * called for a read, do the setup so that checksum validation
                  * can happen in the async kernel threads
@@ -1427,7 +1427,7 @@ static void end_workqueue_fn(struct btrfs_work *work)
          * ram and up to date before trying to verify things.  For
          * blocksize <= pagesize, it is basically a noop
          */
-        if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata &&
+        if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata &&
             !bio_ready_for_csum(bio)) {
                 btrfs_queue_worker(&fs_info->endio_meta_workers,
                                    &end_io_wq->work);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8976c3343a96..c03864406af3 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1429,7 +1429,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
         ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
         BUG_ON(ret);
 
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 if (bio_flags & EXTENT_BIO_COMPRESSED) {
                         return btrfs_submit_compressed_read(inode, bio,
                                                     mirror_num, bio_flags);
@@ -1841,7 +1841,7 @@ static int btrfs_io_failed_hook(struct bio *failed_bio,
         bio->bi_size = 0;
 
         bio_add_page(bio, page, failrec->len, start - page_offset(page));
-        if (failed_bio->bi_rw & (1 << BIO_RW))
+        if (failed_bio->bi_rw & REQ_WRITE)
                 rw = WRITE;
         else
                 rw = READ;
@@ -5647,7 +5647,7 @@ static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
         struct bio_vec *bvec = bio->bi_io_vec;
         u64 start;
         int skip_sum;
-        int write = rw & (1 << BIO_RW);
+        int write = rw & REQ_WRITE;
         int ret = 0;
 
         skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d6e3af8be95b..dd318ff280b2 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -258,7 +258,7 @@ loop_lock:
 
                 BUG_ON(atomic_read(&cur->bi_cnt) == 0);
 
-                if (bio_rw_flagged(cur, BIO_RW_SYNCIO))
+                if (cur->bi_rw & REQ_SYNC)
                         num_sync_run++;
 
                 submit_bio(cur->bi_rw, cur);
@@ -2651,7 +2651,7 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
         int max_errors = 0;
         struct btrfs_multi_bio *multi = NULL;
 
-        if (multi_ret && !(rw & (1 << BIO_RW)))
+        if (multi_ret && !(rw & REQ_WRITE))
                 stripes_allocated = 1;
 again:
         if (multi_ret) {
@@ -2687,7 +2687,7 @@ again:
                 mirror_num = 0;
 
         /* if our multi bio struct is too small, back off and try again */
-        if (rw & (1 << BIO_RW)) {
+        if (rw & REQ_WRITE) {
                 if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
                                  BTRFS_BLOCK_GROUP_DUP)) {
                         stripes_required = map->num_stripes;
@@ -2697,7 +2697,7 @@ again:
                         max_errors = 1;
                 }
         }
-        if (multi_ret && (rw & (1 << BIO_RW)) &&
+        if (multi_ret && (rw & REQ_WRITE) &&
             stripes_allocated < stripes_required) {
                 stripes_allocated = map->num_stripes;
                 free_extent_map(em);
@@ -2733,7 +2733,7 @@ again:
         num_stripes = 1;
         stripe_index = 0;
         if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
-                if (unplug_page || (rw & (1 << BIO_RW)))
+                if (unplug_page || (rw & REQ_WRITE))
                         num_stripes = map->num_stripes;
                 else if (mirror_num)
                         stripe_index = mirror_num - 1;
@@ -2744,7 +2744,7 @@ again:
                 }
 
         } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
-                if (rw & (1 << BIO_RW))
+                if (rw & REQ_WRITE)
                         num_stripes = map->num_stripes;
                 else if (mirror_num)
                         stripe_index = mirror_num - 1;
@@ -2755,7 +2755,7 @@ again:
                 stripe_index = do_div(stripe_nr, factor);
                 stripe_index *= map->sub_stripes;
 
-                if (unplug_page || (rw & (1 << BIO_RW)))
+                if (unplug_page || (rw & REQ_WRITE))
                         num_stripes = map->sub_stripes;
                 else if (mirror_num)
                         stripe_index += mirror_num - 1;
@@ -2945,7 +2945,7 @@ static noinline int schedule_bio(struct btrfs_root *root,
         struct btrfs_pending_bios *pending_bios;
 
         /* don't bother with additional async steps for reads, right now */
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 bio_get(bio);
                 submit_bio(rw, bio);
                 bio_put(bio);
@@ -2964,7 +2964,7 @@ static noinline int schedule_bio(struct btrfs_root *root,
         bio->bi_rw |= rw;
 
         spin_lock(&device->io_lock);
-        if (bio_rw_flagged(bio, BIO_RW_SYNCIO))
+        if (bio->bi_rw & REQ_SYNC)
                 pending_bios = &device->pending_sync_bios;
         else
                 pending_bios = &device->pending_bios;
diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index 66b9cf79c5ba..de89645777c7 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -177,7 +177,7 @@ static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
                 nbytes = req->uc_outSize; /* don't have more space! */
         }
         if (copy_from_user(req->uc_data, buf, nbytes)) {
-                req->uc_flags |= REQ_ABORT;
+                req->uc_flags |= CODA_REQ_ABORT;
                 wake_up(&req->uc_sleep);
                 retval = -EFAULT;
                 goto out;
@@ -254,8 +254,8 @@ static ssize_t coda_psdev_read(struct file * file, char __user * buf,
                 retval = -EFAULT;
         
         /* If request was not a signal, enqueue and don't free */
-        if (!(req->uc_flags & REQ_ASYNC)) {
-                req->uc_flags |= REQ_READ;
+        if (!(req->uc_flags & CODA_REQ_ASYNC)) {
+                req->uc_flags |= CODA_REQ_READ;
                 list_add_tail(&(req->uc_chain), &vcp->vc_processing);
                 goto out;
         }
@@ -315,19 +315,19 @@ static int coda_psdev_release(struct inode * inode, struct file * file)
                 list_del(&req->uc_chain);
 
                 /* Async requests need to be freed here */
-                if (req->uc_flags & REQ_ASYNC) {
+                if (req->uc_flags & CODA_REQ_ASYNC) {
                         CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
                         kfree(req);
                         continue;
                 }
-                req->uc_flags |= REQ_ABORT;
+                req->uc_flags |= CODA_REQ_ABORT;
                 wake_up(&req->uc_sleep);
         }
 
         list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
                 list_del(&req->uc_chain);
 
-                req->uc_flags |= REQ_ABORT;
+                req->uc_flags |= CODA_REQ_ABORT;
                 wake_up(&req->uc_sleep);
         }
 
diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
index f09c5ed76f6c..b8893ab6f9e6 100644
--- a/fs/coda/upcall.c
+++ b/fs/coda/upcall.c
@@ -604,7 +604,7 @@ static void coda_unblock_signals(sigset_t *old)
                                (((r)->uc_opcode != CODA_CLOSE && \
                                  (r)->uc_opcode != CODA_STORE && \
                                  (r)->uc_opcode != CODA_RELEASE) || \
-                                (r)->uc_flags & REQ_READ))
+                                (r)->uc_flags & CODA_REQ_READ))
 
 static inline void coda_waitfor_upcall(struct upc_req *req)
 {
@@ -624,7 +624,7 @@ static inline void coda_waitfor_upcall(struct upc_req *req)
                         set_current_state(TASK_UNINTERRUPTIBLE);
 
                 /* got a reply */
-                if (req->uc_flags & (REQ_WRITE | REQ_ABORT))
+                if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT))
                         break;
 
                 if (blocked && time_after(jiffies, timeout) &&
@@ -708,7 +708,7 @@ static int coda_upcall(struct venus_comm *vcp,
         coda_waitfor_upcall(req);
 
         /* Op went through, interrupt or not... */
-        if (req->uc_flags & REQ_WRITE) {
+        if (req->uc_flags & CODA_REQ_WRITE) {
                 out = (union outputArgs *)req->uc_data;
                 /* here we map positive Venus errors to kernel errors */
                 error = -out->oh.result;
@@ -717,13 +717,13 @@ static int coda_upcall(struct venus_comm *vcp,
         }
 
         error = -EINTR;
-        if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) {
+        if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) {
                 printk(KERN_WARNING "coda: Unexpected interruption.\n");
                 goto exit;
         }
 
         /* Interrupted before venus read it. */
-        if (!(req->uc_flags & REQ_READ))
+        if (!(req->uc_flags & CODA_REQ_READ))
                 goto exit;
 
         /* Venus saw the upcall, make sure we can send interrupt signal */
@@ -747,7 +747,7 @@ static int coda_upcall(struct venus_comm *vcp,
         sig_inputArgs->ih.opcode = CODA_SIGNAL;
         sig_inputArgs->ih.unique = req->uc_unique;
 
-        sig_req->uc_flags = REQ_ASYNC;
+        sig_req->uc_flags = CODA_REQ_ASYNC;
         sig_req->uc_opcode = sig_inputArgs->ih.opcode;
         sig_req->uc_unique = sig_inputArgs->ih.unique;
         sig_req->uc_inSize = sizeof(struct coda_in_hdr);
diff --git a/fs/exofs/ios.c b/fs/exofs/ios.c
index 4337cad7777b..e2732203fa93 100644
--- a/fs/exofs/ios.c
+++ b/fs/exofs/ios.c
@@ -599,7 +599,7 @@ static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp)
                         } else {
                                 bio = master_dev->bio;
                                 /* FIXME: bio_set_dir() */
-                                bio->bi_rw |= (1 << BIO_RW);
+                                bio->bi_rw |= REQ_WRITE;
                         }
 
                         osd_req_write(or, &ios->obj, per_dev->offset, bio,
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index b7c7586caea1..2f76c4a081a2 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -26,15 +26,9 @@
 #include <linux/blkdev.h>
 #include <linux/backing-dev.h>
 #include <linux/buffer_head.h>
+#include <linux/tracepoint.h>
 #include "internal.h"
 
-#define inode_to_bdi(inode)     ((inode)->i_mapping->backing_dev_info)
-
-/*
- * We don't actually have pdflush, but this one is exported though /proc...
- */
-int nr_pdflush_threads;
-
 /*
  * Passed into wb_writeback(), essentially a subset of writeback_control
  */
@@ -50,6 +44,21 @@ struct wb_writeback_work {
         struct completion *done;        /* set if the caller waits */
 };
 
+/*
+ * Include the creation of the trace points after defining the
+ * wb_writeback_work structure so that the definition remains local to this
+ * file.
+ */
+#define CREATE_TRACE_POINTS
+#include <trace/events/writeback.h>
+
+#define inode_to_bdi(inode)     ((inode)->i_mapping->backing_dev_info)
+
+/*
+ * We don't actually have pdflush, but this one is exported though /proc...
+ */
+int nr_pdflush_threads;
+
 /**
  * writeback_in_progress - determine whether there is writeback in progress
  * @bdi: the device's backing_dev_info structure.
@@ -65,22 +74,21 @@ int writeback_in_progress(struct backing_dev_info *bdi)
 static void bdi_queue_work(struct backing_dev_info *bdi,
                 struct wb_writeback_work *work)
 {
-        spin_lock(&bdi->wb_lock);
-        list_add_tail(&work->list, &bdi->work_list);
-        spin_unlock(&bdi->wb_lock);
+        trace_writeback_queue(bdi, work);
 
-        /*
-         * If the default thread isn't there, make sure we add it. When
-         * it gets created and wakes up, we'll run this work.
-         */
-        if (unlikely(list_empty_careful(&bdi->wb_list)))
+        spin_lock_bh(&bdi->wb_lock);
+        list_add_tail(&work->list, &bdi->work_list);
+        if (bdi->wb.task) {
+                wake_up_process(bdi->wb.task);
+        } else {
+                /*
+                 * The bdi thread isn't there, wake up the forker thread which
+                 * will create and run it.
+                 */
+                trace_writeback_nothread(bdi, work);
                 wake_up_process(default_backing_dev_info.wb.task);
-        else {
-                struct bdi_writeback *wb = &bdi->wb;
-
-                if (wb->task)
-                        wake_up_process(wb->task);
         }
+        spin_unlock_bh(&bdi->wb_lock);
 }
 
 static void
@@ -95,8 +103,10 @@ __bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
          */
         work = kzalloc(sizeof(*work), GFP_ATOMIC);
         if (!work) {
-                if (bdi->wb.task)
+                if (bdi->wb.task) {
+                        trace_writeback_nowork(bdi);
                         wake_up_process(bdi->wb.task);
+                }
                 return;
         }
 
@@ -643,10 +653,14 @@ static long wb_writeback(struct bdi_writeback *wb,
                 wbc.more_io = 0;
                 wbc.nr_to_write = MAX_WRITEBACK_PAGES;
                 wbc.pages_skipped = 0;
+
+                trace_wbc_writeback_start(&wbc, wb->bdi);
                 if (work->sb)
                         __writeback_inodes_sb(work->sb, wb, &wbc);
                 else
                         writeback_inodes_wb(wb, &wbc);
+                trace_wbc_writeback_written(&wbc, wb->bdi);
+
                 work->nr_pages -= MAX_WRITEBACK_PAGES - wbc.nr_to_write;
                 wrote += MAX_WRITEBACK_PAGES - wbc.nr_to_write;
 
@@ -674,6 +688,7 @@ static long wb_writeback(struct bdi_writeback *wb,
                 if (!list_empty(&wb->b_more_io))  {
                         inode = list_entry(wb->b_more_io.prev,
                                                 struct inode, i_list);
+                        trace_wbc_writeback_wait(&wbc, wb->bdi);
                         inode_wait_for_writeback(inode);
                 }
                 spin_unlock(&inode_lock);
@@ -686,17 +701,17 @@ static long wb_writeback(struct bdi_writeback *wb,
  * Return the next wb_writeback_work struct that hasn't been processed yet.
  */
 static struct wb_writeback_work *
-get_next_work_item(struct backing_dev_info *bdi, struct bdi_writeback *wb)
+get_next_work_item(struct backing_dev_info *bdi)
 {
         struct wb_writeback_work *work = NULL;
 
-        spin_lock(&bdi->wb_lock);
+        spin_lock_bh(&bdi->wb_lock);
         if (!list_empty(&bdi->work_list)) {
                 work = list_entry(bdi->work_list.next,
                                   struct wb_writeback_work, list);
                 list_del_init(&work->list);
         }
-        spin_unlock(&bdi->wb_lock);
+        spin_unlock_bh(&bdi->wb_lock);
         return work;
 }
 
@@ -744,7 +759,7 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
         struct wb_writeback_work *work;
         long wrote = 0;
 
-        while ((work = get_next_work_item(bdi, wb)) != NULL) {
+        while ((work = get_next_work_item(bdi)) != NULL) {
                 /*
                  * Override sync mode, in case we must wait for completion
                  * because this thread is exiting now.
@@ -752,6 +767,8 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
                 if (force_wait)
                         work->sync_mode = WB_SYNC_ALL;
 
+                trace_writeback_exec(bdi, work);
+
                 wrote += wb_writeback(wb, work);
 
                 /*
@@ -776,47 +793,66 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
  * Handle writeback of dirty data for the device backed by this bdi. Also
  * wakes up periodically and does kupdated style flushing.
  */
-int bdi_writeback_task(struct bdi_writeback *wb)
+int bdi_writeback_thread(void *data)
 {
-        unsigned long last_active = jiffies;
-        unsigned long wait_jiffies = -1UL;
+        struct bdi_writeback *wb = data;
+        struct backing_dev_info *bdi = wb->bdi;
         long pages_written;
 
+        current->flags |= PF_FLUSHER | PF_SWAPWRITE;
+        set_freezable();
+        wb->last_active = jiffies;
+
+        /*
+         * Our parent may run at a different priority, just set us to normal
+         */
+        set_user_nice(current, 0);
+
+        trace_writeback_thread_start(bdi);
+
         while (!kthread_should_stop()) {
+                /*
+                 * Remove own delayed wake-up timer, since we are already awake
+                 * and we'll take care of the preriodic write-back.
+                 */
+                del_timer(&wb->wakeup_timer);
+
                 pages_written = wb_do_writeback(wb, 0);
 
+                trace_writeback_pages_written(pages_written);
+
                 if (pages_written)
-                        last_active = jiffies;
-                else if (wait_jiffies != -1UL) {
-                        unsigned long max_idle;
+                        wb->last_active = jiffies;
 
-                        /*
-                         * Longest period of inactivity that we tolerate. If we
-                         * see dirty data again later, the task will get
-                         * recreated automatically.
-                         */
-                        max_idle = max(5UL * 60 * HZ, wait_jiffies);
-                        if (time_after(jiffies, max_idle + last_active))
-                                break;
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (!list_empty(&bdi->work_list)) {
+                        __set_current_state(TASK_RUNNING);
+                        continue;
                 }
 
-                if (dirty_writeback_interval) {
-                        wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
-                        schedule_timeout_interruptible(wait_jiffies);
-                } else {
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        if (list_empty_careful(&wb->bdi->work_list) &&
-                            !kthread_should_stop())
-                                schedule();
-                        __set_current_state(TASK_RUNNING);
+                if (wb_has_dirty_io(wb) && dirty_writeback_interval)
+                        schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10));
+                else {
+                        /*
+                         * We have nothing to do, so can go sleep without any
+                         * timeout and save power. When a work is queued or
+                         * something is made dirty - we will be woken up.
+                         */
+                        schedule();
                 }
 
                 try_to_freeze();
         }
 
+        /* Flush any work that raced with us exiting */
+        if (!list_empty(&bdi->work_list))
+                wb_do_writeback(wb, 1);
+
+        trace_writeback_thread_stop(bdi);
         return 0;
 }
 
+
 /*
  * Start writeback of `nr_pages' pages.  If `nr_pages' is zero, write back
  * the whole world.
@@ -891,6 +927,8 @@ static noinline void block_dump___mark_inode_dirty(struct inode *inode)
 void __mark_inode_dirty(struct inode *inode, int flags)
 {
         struct super_block *sb = inode->i_sb;
+        struct backing_dev_info *bdi = NULL;
+        bool wakeup_bdi = false;
 
         /*
          * Don't do this for I_DIRTY_PAGES - that doesn't actually
@@ -944,22 +982,31 @@ void __mark_inode_dirty(struct inode *inode, int flags)
                  * reposition it (that would break b_dirty time-ordering).
                  */
                 if (!was_dirty) {
-                        struct bdi_writeback *wb = &inode_to_bdi(inode)->wb;
-                        struct backing_dev_info *bdi = wb->bdi;
-
-                        if (bdi_cap_writeback_dirty(bdi) &&
-                            !test_bit(BDI_registered, &bdi->state)) {
-                                WARN_ON(1);
-                                printk(KERN_ERR "bdi-%s not registered\n",
-                                                                bdi->name);
+                        bdi = inode_to_bdi(inode);
+
+                        if (bdi_cap_writeback_dirty(bdi)) {
+                                WARN(!test_bit(BDI_registered, &bdi->state),
+                                     "bdi-%s not registered\n", bdi->name);
+
+                                /*
+                                 * If this is the first dirty inode for this
+                                 * bdi, we have to wake-up the corresponding
+                                 * bdi thread to make sure background
+                                 * write-back happens later.
+                                 */
+                                if (!wb_has_dirty_io(&bdi->wb))
+                                        wakeup_bdi = true;
                         }
 
                         inode->dirtied_when = jiffies;
-                        list_move(&inode->i_list, &wb->b_dirty);
+                        list_move(&inode->i_list, &bdi->wb.b_dirty);
                 }
         }
 out:
         spin_unlock(&inode_lock);
+
+        if (wakeup_bdi)
+                bdi_wakeup_thread_delayed(bdi);
 }
 EXPORT_SYMBOL(__mark_inode_dirty);
 
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 6a857e24f947..cde1248a6225 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -595,7 +595,7 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
                 goto skip_barrier;
         get_bh(bh);
-        submit_bh(WRITE_SYNC | (1 << BIO_RW_BARRIER) | (1 << BIO_RW_META), bh);
+        submit_bh(WRITE_BARRIER | REQ_META, bh);
         wait_on_buffer(bh);
         if (buffer_eopnotsupp(bh)) {
                 clear_buffer_eopnotsupp(bh);
@@ -605,7 +605,7 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
                 lock_buffer(bh);
 skip_barrier:
                 get_bh(bh);
-                submit_bh(WRITE_SYNC | (1 << BIO_RW_META), bh);
+                submit_bh(WRITE_SYNC | REQ_META, bh);
                 wait_on_buffer(bh);
         }
         if (!buffer_uptodate(bh))
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 18176d0b75d7..f3b071f921aa 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -36,8 +36,8 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
 {
         struct buffer_head *bh, *head;
         int nr_underway = 0;
-        int write_op = (1 << BIO_RW_META) | ((wbc->sync_mode == WB_SYNC_ALL ?
-                        WRITE_SYNC_PLUG : WRITE));
+        int write_op = REQ_META |
+                (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC_PLUG : WRITE);
 
         BUG_ON(!PageLocked(page));
         BUG_ON(!page_has_buffers(page));
@@ -225,7 +225,7 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
         }
         bh->b_end_io = end_buffer_read_sync;
         get_bh(bh);
-        submit_bh(READ_SYNC | (1 << BIO_RW_META), bh);
+        submit_bh(READ_SYNC | REQ_META, bh);
         if (!(flags & DIO_WAIT))
                 return 0;
 
@@ -432,7 +432,7 @@ struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
         if (buffer_uptodate(first_bh))
                 goto out;
         if (!buffer_locked(first_bh))
-                ll_rw_block(READ_SYNC | (1 << BIO_RW_META), 1, &first_bh);
+                ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
 
         dblock++;
         extlen--;
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 4f44bdeb2f03..4d4b1e8ac64c 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -274,7 +274,7 @@ static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 
         bio->bi_end_io = end_bio_io_page;
         bio->bi_private = page;
-        submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
+        submit_bio(READ_SYNC | REQ_META, bio);
         wait_on_page_locked(page);
         bio_put(bio);
         if (!PageUptodate(page)) {
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 2e6a2723b8fa..4588fb9e93df 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -508,7 +508,7 @@ static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
                  * Last BIO is always sent through the following
                  * submission.
                  */
-                rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+                rw |= REQ_SYNC | REQ_UNPLUG;
                 res = nilfs_segbuf_submit_bio(segbuf, &wi, rw);
         }
 
diff --git a/fs/splice.c b/fs/splice.c
index efdbfece9932..8f1dfaecc8f0 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -399,17 +399,7 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
                  * If the page isn't uptodate, we may need to start io on it
                  */
                 if (!PageUptodate(page)) {
-                        /*
-                         * If in nonblock mode then dont block on waiting
-                         * for an in-flight io page
-                         */
-                        if (flags & SPLICE_F_NONBLOCK) {
-                                if (!trylock_page(page)) {
-                                        error = -EAGAIN;
-                                        break;
-                                }
-                        } else
-                                lock_page(page);
+                        lock_page(page);
 
                         /*
                          * Page was truncated, or invalidated by the
@@ -597,7 +587,6 @@ ssize_t default_file_splice_read(struct file *in, loff_t *ppos,
         struct page *pages[PIPE_DEF_BUFFERS];
         struct partial_page partial[PIPE_DEF_BUFFERS];
         struct iovec *vec, __vec[PIPE_DEF_BUFFERS];
-        pgoff_t index;
         ssize_t res;
         size_t this_len;
         int error;
@@ -621,7 +610,6 @@ ssize_t default_file_splice_read(struct file *in, loff_t *ppos,
                         goto shrink_ret;
         }
 
-        index = *ppos >> PAGE_CACHE_SHIFT;
         offset = *ppos & ~PAGE_CACHE_MASK;
         nr_pages = (len + offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 2547daf2aef2..9d65d4d0bd9c 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -39,6 +39,7 @@ header-y += ax25.h
 header-y += b1lli.h
 header-y += baycom.h
 header-y += bfs_fs.h
+header-y += blk_types.h
 header-y += blkpg.h
 header-y += bpqether.h
 header-y += bsg.h
diff --git a/include/linux/audit.h b/include/linux/audit.h
index f391d45c8aea..e24afabc548f 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -544,7 +544,7 @@ extern int audit_signals;
 #define audit_putname(n) do { ; } while (0)
 #define __audit_inode(n,d) do { ; } while (0)
 #define __audit_inode_child(i,p) do { ; } while (0)
-#define audit_inode(n,d) do { ; } while (0)
+#define audit_inode(n,d) do { (void)(d); } while (0)
 #define audit_inode_child(i,p) do { ; } while (0)
 #define audit_core_dumps(i) do { ; } while (0)
 #define auditsc_get_stamp(c,t,s) (0)
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index e9aec0d099df..7628219e5386 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -45,22 +45,21 @@ enum bdi_stat_item {
 #define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
 
 struct bdi_writeback {
-        struct list_head list;                  /* hangs off the bdi */
-
-        struct backing_dev_info *bdi;           /* our parent bdi */
+        struct backing_dev_info *bdi;   /* our parent bdi */
         unsigned int nr;
 
-        unsigned long last_old_flush;           /* last old data flush */
+        unsigned long last_old_flush;   /* last old data flush */
+        unsigned long last_active;      /* last time bdi thread was active */
 
-        struct task_struct      *task;          /* writeback task */
-        struct list_head        b_dirty;        /* dirty inodes */
-        struct list_head        b_io;           /* parked for writeback */
-        struct list_head        b_more_io;      /* parked for more writeback */
+        struct task_struct *task;       /* writeback thread */
+        struct timer_list wakeup_timer; /* used for delayed bdi thread wakeup */
+        struct list_head b_dirty;       /* dirty inodes */
+        struct list_head b_io;          /* parked for writeback */
+        struct list_head b_more_io;     /* parked for more writeback */
 };
 
 struct backing_dev_info {
         struct list_head bdi_list;
-        struct rcu_head rcu_head;
         unsigned long ra_pages; /* max readahead in PAGE_CACHE_SIZE units */
         unsigned long state;    /* Always use atomic bitops on this */
         unsigned int capabilities; /* Device capabilities */
@@ -80,8 +79,7 @@ struct backing_dev_info {
         unsigned int max_ratio, max_prop_frac;
 
         struct bdi_writeback wb;  /* default writeback info for this bdi */
-        spinlock_t wb_lock;       /* protects update side of wb_list */
-        struct list_head wb_list; /* the flusher threads hanging off this bdi */
+        spinlock_t wb_lock;       /* protects work_list */
 
         struct list_head work_list;
 
@@ -105,9 +103,10 @@ void bdi_unregister(struct backing_dev_info *bdi);
 int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
 void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
 void bdi_start_background_writeback(struct backing_dev_info *bdi);
-int bdi_writeback_task(struct bdi_writeback *wb);
+int bdi_writeback_thread(void *data);
 int bdi_has_dirty_io(struct backing_dev_info *bdi);
 void bdi_arm_supers_timer(void);
+void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi);
 
 extern spinlock_t bdi_lock;
 extern struct list_head bdi_list;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7fc5606e6ea5..5274103434ad 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -9,7 +9,7 @@
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-
+ *
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
@@ -28,6 +28,9 @@
 
 #include <asm/io.h>
 
+/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
+#include <linux/blk_types.h>
+
 #define BIO_DEBUG
 
 #ifdef BIO_DEBUG
@@ -41,154 +44,6 @@
 #define BIO_MAX_SECTORS         (BIO_MAX_SIZE >> 9)
 
 /*
- * was unsigned short, but we might as well be ready for > 64kB I/O pages
- */
-struct bio_vec {
-        struct page     *bv_page;
-        unsigned int    bv_len;
-        unsigned int    bv_offset;
-};
-
-struct bio_set;
-struct bio;
-struct bio_integrity_payload;
-typedef void (bio_end_io_t) (struct bio *, int);
-typedef void (bio_destructor_t) (struct bio *);
-
-/*
- * main unit of I/O for the block layer and lower layers (ie drivers and
- * stacking drivers)
- */
-struct bio {
-        sector_t                bi_sector;      /* device address in 512 byte
-                                                   sectors */
-        struct bio              *bi_next;       /* request queue link */
-        struct block_device     *bi_bdev;
-        unsigned long           bi_flags;       /* status, command, etc */
-        unsigned long           bi_rw;          /* bottom bits READ/WRITE,
-                                                 * top bits priority
-                                                 */
-
-        unsigned short          bi_vcnt;        /* how many bio_vec's */
-        unsigned short          bi_idx;         /* current index into bvl_vec */
-
-        /* Number of segments in this BIO after
-         * physical address coalescing is performed.
-         */
-        unsigned int            bi_phys_segments;
-
-        unsigned int            bi_size;        /* residual I/O count */
-
-        /*
-         * To keep track of the max segment size, we account for the
-         * sizes of the first and last mergeable segments in this bio.
-         */
-        unsigned int            bi_seg_front_size;
-        unsigned int            bi_seg_back_size;
-
-        unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
-
-        unsigned int            bi_comp_cpu;    /* completion CPU */
-
-        atomic_t                bi_cnt;         /* pin count */
-
-        struct bio_vec          *bi_io_vec;     /* the actual vec list */
-
-        bio_end_io_t            *bi_end_io;
-
-        void                    *bi_private;
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
-        struct bio_integrity_payload *bi_integrity;  /* data integrity */
-#endif
-
-        bio_destructor_t        *bi_destructor; /* destructor */
-
-        /*
-         * We can inline a number of vecs at the end of the bio, to avoid
-         * double allocations for a small number of bio_vecs. This member
-         * MUST obviously be kept at the very end of the bio.
-         */
-        struct bio_vec          bi_inline_vecs[0];
-};
-
-/*
- * bio flags
- */
-#define BIO_UPTODATE    0       /* ok after I/O completion */
-#define BIO_RW_BLOCK    1       /* RW_AHEAD set, and read/write would block */
-#define BIO_EOF         2       /* out-out-bounds error */
-#define BIO_SEG_VALID   3       /* bi_phys_segments valid */
-#define BIO_CLONED      4       /* doesn't own data */
-#define BIO_BOUNCED     5       /* bio is a bounce bio */
-#define BIO_USER_MAPPED 6       /* contains user pages */
-#define BIO_EOPNOTSUPP  7       /* not supported */
-#define BIO_CPU_AFFINE  8       /* complete bio on same CPU as submitted */
-#define BIO_NULL_MAPPED 9       /* contains invalid user pages */
-#define BIO_FS_INTEGRITY 10     /* fs owns integrity data, not block layer */
-#define BIO_QUIET       11      /* Make BIO Quiet */
-#define bio_flagged(bio, flag)  ((bio)->bi_flags & (1 << (flag)))
-
-/*
- * top 4 bits of bio flags indicate the pool this bio came from
- */
-#define BIO_POOL_BITS           (4)
-#define BIO_POOL_NONE           ((1UL << BIO_POOL_BITS) - 1)
-#define BIO_POOL_OFFSET         (BITS_PER_LONG - BIO_POOL_BITS)
-#define BIO_POOL_MASK           (1UL << BIO_POOL_OFFSET)
-#define BIO_POOL_IDX(bio)       ((bio)->bi_flags >> BIO_POOL_OFFSET)    
-
-/*
- * bio bi_rw flags
- *
- * bit 0 -- data direction
- *      If not set, bio is a read from device. If set, it's a write to device.
- * bit 1 -- fail fast device errors
- * bit 2 -- fail fast transport errors
- * bit 3 -- fail fast driver errors
- * bit 4 -- rw-ahead when set
- * bit 5 -- barrier
- *      Insert a serialization point in the IO queue, forcing previously
- *      submitted IO to be completed before this one is issued.
- * bit 6 -- synchronous I/O hint.
- * bit 7 -- Unplug the device immediately after submitting this bio.
- * bit 8 -- metadata request
- *      Used for tracing to differentiate metadata and data IO. May also
- *      get some preferential treatment in the IO scheduler
- * bit 9 -- discard sectors
- *      Informs the lower level device that this range of sectors is no longer
- *      used by the file system and may thus be freed by the device. Used
- *      for flash based storage.
- *      Don't want driver retries for any fast fail whatever the reason.
- * bit 10 -- Tell the IO scheduler not to wait for more requests after this
-        one has been submitted, even if it is a SYNC request.
- */
-enum bio_rw_flags {
-        BIO_RW,
-        BIO_RW_FAILFAST_DEV,
-        BIO_RW_FAILFAST_TRANSPORT,
-        BIO_RW_FAILFAST_DRIVER,
-        /* above flags must match REQ_* */
-        BIO_RW_AHEAD,
-        BIO_RW_BARRIER,
-        BIO_RW_SYNCIO,
-        BIO_RW_UNPLUG,
-        BIO_RW_META,
-        BIO_RW_DISCARD,
-        BIO_RW_NOIDLE,
-};
-
-/*
- * First four bits must match between bio->bi_rw and rq->cmd_flags, make
- * that explicit here.
- */
-#define BIO_RW_RQ_MASK          0xf
-
-static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
-{
-        return (bio->bi_rw & (1 << flag)) != 0;
-}
-
-/*
  * upper 16 bits of bi_rw define the io priority of this bio
  */
 #define BIO_PRIO_SHIFT  (8 * sizeof(unsigned long) - IOPRIO_BITS)
@@ -211,7 +66,10 @@ static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
 #define bio_offset(bio)         bio_iovec((bio))->bv_offset
 #define bio_segments(bio)       ((bio)->bi_vcnt - (bio)->bi_idx)
 #define bio_sectors(bio)        ((bio)->bi_size >> 9)
-#define bio_empty_barrier(bio)  (bio_rw_flagged(bio, BIO_RW_BARRIER) && !bio_has_data(bio) && !bio_rw_flagged(bio, BIO_RW_DISCARD))
+#define bio_empty_barrier(bio) \
+        ((bio->bi_rw & REQ_HARDBARRIER) && \
+         !bio_has_data(bio) && \
+         !(bio->bi_rw & REQ_DISCARD))
 
 static inline unsigned int bio_cur_bytes(struct bio *bio)
 {
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
new file mode 100644
index 000000000000..53691774d34e
--- /dev/null
+++ b/include/linux/blk_types.h
@@ -0,0 +1,194 @@
+/*
+ * Block data types and constants.  Directly include this file only to
+ * break include dependency loop.
+ */
+#ifndef __LINUX_BLK_TYPES_H
+#define __LINUX_BLK_TYPES_H
+
+#ifdef CONFIG_BLOCK
+
+#include <linux/types.h>
+
+struct bio_set;
+struct bio;
+struct bio_integrity_payload;
+struct page;
+struct block_device;
+typedef void (bio_end_io_t) (struct bio *, int);
+typedef void (bio_destructor_t) (struct bio *);
+
+/*
+ * was unsigned short, but we might as well be ready for > 64kB I/O pages
+ */
+struct bio_vec {
+        struct page     *bv_page;
+        unsigned int    bv_len;
+        unsigned int    bv_offset;
+};
+
+/*
+ * main unit of I/O for the block layer and lower layers (ie drivers and
+ * stacking drivers)
+ */
+struct bio {
+        sector_t                bi_sector;      /* device address in 512 byte
+                                                   sectors */
+        struct bio              *bi_next;       /* request queue link */
+        struct block_device     *bi_bdev;
+        unsigned long           bi_flags;       /* status, command, etc */
+        unsigned long           bi_rw;          /* bottom bits READ/WRITE,
+                                                 * top bits priority
+                                                 */
+
+        unsigned short          bi_vcnt;        /* how many bio_vec's */
+        unsigned short          bi_idx;         /* current index into bvl_vec */
+
+        /* Number of segments in this BIO after
+         * physical address coalescing is performed.
+         */
+        unsigned int            bi_phys_segments;
+
+        unsigned int            bi_size;        /* residual I/O count */
+
+        /*
+         * To keep track of the max segment size, we account for the
+         * sizes of the first and last mergeable segments in this bio.
+         */
+        unsigned int            bi_seg_front_size;
+        unsigned int            bi_seg_back_size;
+
+        unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
+
+        unsigned int            bi_comp_cpu;    /* completion CPU */
+
+        atomic_t                bi_cnt;         /* pin count */
+
+        struct bio_vec          *bi_io_vec;     /* the actual vec list */
+
+        bio_end_io_t            *bi_end_io;
+
+        void                    *bi_private;
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+        struct bio_integrity_payload *bi_integrity;  /* data integrity */
+#endif
+
+        bio_destructor_t        *bi_destructor; /* destructor */
+
+        /*
+         * We can inline a number of vecs at the end of the bio, to avoid
+         * double allocations for a small number of bio_vecs. This member
+         * MUST obviously be kept at the very end of the bio.
+         */
+        struct bio_vec          bi_inline_vecs[0];
+};
+
+/*
+ * bio flags
+ */
+#define BIO_UPTODATE    0       /* ok after I/O completion */
+#define BIO_RW_BLOCK    1       /* RW_AHEAD set, and read/write would block */
+#define BIO_EOF         2       /* out-out-bounds error */
+#define BIO_SEG_VALID   3       /* bi_phys_segments valid */
+#define BIO_CLONED      4       /* doesn't own data */
+#define BIO_BOUNCED     5       /* bio is a bounce bio */
+#define BIO_USER_MAPPED 6       /* contains user pages */
+#define BIO_EOPNOTSUPP  7       /* not supported */
+#define BIO_CPU_AFFINE  8       /* complete bio on same CPU as submitted */
+#define BIO_NULL_MAPPED 9       /* contains invalid user pages */
+#define BIO_FS_INTEGRITY 10     /* fs owns integrity data, not block layer */
+#define BIO_QUIET       11      /* Make BIO Quiet */
+#define bio_flagged(bio, flag)  ((bio)->bi_flags & (1 << (flag)))
+
+/*
+ * top 4 bits of bio flags indicate the pool this bio came from
+ */
+#define BIO_POOL_BITS           (4)
+#define BIO_POOL_NONE           ((1UL << BIO_POOL_BITS) - 1)
+#define BIO_POOL_OFFSET         (BITS_PER_LONG - BIO_POOL_BITS)
+#define BIO_POOL_MASK           (1UL << BIO_POOL_OFFSET)
+#define BIO_POOL_IDX(bio)       ((bio)->bi_flags >> BIO_POOL_OFFSET)
+
+#endif /* CONFIG_BLOCK */
+
+/*
+ * Request flags.  For use in the cmd_flags field of struct request, and in
+ * bi_rw of struct bio.  Note that some flags are only valid in either one.
+ */
+enum rq_flag_bits {
+        /* common flags */
+        __REQ_WRITE,            /* not set, read. set, write */
+        __REQ_FAILFAST_DEV,     /* no driver retries of device errors */
+        __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
+        __REQ_FAILFAST_DRIVER,  /* no driver retries of driver errors */
+
+        __REQ_HARDBARRIER,      /* may not be passed by drive either */
+        __REQ_SYNC,             /* request is sync (sync write or read) */
+        __REQ_META,             /* metadata io request */
+        __REQ_DISCARD,          /* request to discard sectors */
+        __REQ_NOIDLE,           /* don't anticipate more IO after this one */
+
+        /* bio only flags */
+        __REQ_UNPLUG,           /* unplug the immediately after submission */
+        __REQ_RAHEAD,           /* read ahead, can fail anytime */
+
+        /* request only flags */
+        __REQ_SORTED,           /* elevator knows about this request */
+        __REQ_SOFTBARRIER,      /* may not be passed by ioscheduler */
+        __REQ_FUA,              /* forced unit access */
+        __REQ_NOMERGE,          /* don't touch this for merging */
+        __REQ_STARTED,          /* drive already may have started this one */
+        __REQ_DONTPREP,         /* don't call prep for this one */
+        __REQ_QUEUED,           /* uses queueing */
+        __REQ_ELVPRIV,          /* elevator private data attached */
+        __REQ_FAILED,           /* set if the request failed */
+        __REQ_QUIET,            /* don't worry about errors */
+        __REQ_PREEMPT,          /* set for "ide_preempt" requests */
+        __REQ_ORDERED_COLOR,    /* is before or after barrier */
+        __REQ_ALLOCED,          /* request came from our alloc pool */
+        __REQ_COPY_USER,        /* contains copies of user pages */
+        __REQ_INTEGRITY,        /* integrity metadata has been remapped */
+        __REQ_FLUSH,            /* request for cache flush */
+        __REQ_IO_STAT,          /* account I/O stat */
+        __REQ_MIXED_MERGE,      /* merge of different types, fail separately */
+        __REQ_NR_BITS,          /* stops here */
+};
+
+#define REQ_WRITE               (1 << __REQ_WRITE)
+#define REQ_FAILFAST_DEV        (1 << __REQ_FAILFAST_DEV)
+#define REQ_FAILFAST_TRANSPORT  (1 << __REQ_FAILFAST_TRANSPORT)
+#define REQ_FAILFAST_DRIVER     (1 << __REQ_FAILFAST_DRIVER)
+#define REQ_HARDBARRIER         (1 << __REQ_HARDBARRIER)
+#define REQ_SYNC                (1 << __REQ_SYNC)
+#define REQ_META                (1 << __REQ_META)
+#define REQ_DISCARD             (1 << __REQ_DISCARD)
+#define REQ_NOIDLE              (1 << __REQ_NOIDLE)
+
+#define REQ_FAILFAST_MASK \
+        (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
+#define REQ_COMMON_MASK \
+        (REQ_WRITE | REQ_FAILFAST_MASK | REQ_HARDBARRIER | REQ_SYNC | \
+         REQ_META| REQ_DISCARD | REQ_NOIDLE)
+
+#define REQ_UNPLUG              (1 << __REQ_UNPLUG)
+#define REQ_RAHEAD              (1 << __REQ_RAHEAD)
+
+#define REQ_SORTED              (1 << __REQ_SORTED)
+#define REQ_SOFTBARRIER         (1 << __REQ_SOFTBARRIER)
+#define REQ_FUA                 (1 << __REQ_FUA)
+#define REQ_NOMERGE             (1 << __REQ_NOMERGE)
+#define REQ_STARTED             (1 << __REQ_STARTED)
+#define REQ_DONTPREP            (1 << __REQ_DONTPREP)
+#define REQ_QUEUED              (1 << __REQ_QUEUED)
+#define REQ_ELVPRIV             (1 << __REQ_ELVPRIV)
+#define REQ_FAILED              (1 << __REQ_FAILED)
+#define REQ_QUIET               (1 << __REQ_QUIET)
+#define REQ_PREEMPT             (1 << __REQ_PREEMPT)
+#define REQ_ORDERED_COLOR       (1 << __REQ_ORDERED_COLOR)
+#define REQ_ALLOCED             (1 << __REQ_ALLOCED)
+#define REQ_COPY_USER           (1 << __REQ_COPY_USER)
+#define REQ_INTEGRITY           (1 << __REQ_INTEGRITY)
+#define REQ_FLUSH               (1 << __REQ_FLUSH)
+#define REQ_IO_STAT             (1 << __REQ_IO_STAT)
+#define REQ_MIXED_MERGE         (1 << __REQ_MIXED_MERGE)
+
+#endif /* __LINUX_BLK_TYPES_H */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 09a840264d6f..89c855c5655c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -60,7 +60,6 @@ enum rq_cmd_type_bits {
         REQ_TYPE_PM_RESUME,             /* resume request */
         REQ_TYPE_PM_SHUTDOWN,           /* shutdown request */
         REQ_TYPE_SPECIAL,               /* driver defined type */
-        REQ_TYPE_LINUX_BLOCK,           /* generic block layer message */
         /*
          * for ATA/ATAPI devices. this really doesn't belong here, ide should
          * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
@@ -70,84 +69,6 @@ enum rq_cmd_type_bits {
         REQ_TYPE_ATA_PC,
 };
 
-/*
- * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being
- * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a
- * SCSI cdb.
- *
- * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need,
- * typically to differentiate REQ_TYPE_SPECIAL requests.
- *
- */
-enum {
-        REQ_LB_OP_EJECT = 0x40,         /* eject request */
-        REQ_LB_OP_FLUSH = 0x41,         /* flush request */
-};
-
-/*
- * request type modified bits. first four bits match BIO_RW* bits, important
- */
-enum rq_flag_bits {
-        __REQ_RW,               /* not set, read. set, write */
-        __REQ_FAILFAST_DEV,     /* no driver retries of device errors */
-        __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
-        __REQ_FAILFAST_DRIVER,  /* no driver retries of driver errors */
-        /* above flags must match BIO_RW_* */
-        __REQ_DISCARD,          /* request to discard sectors */
-        __REQ_SORTED,           /* elevator knows about this request */
-        __REQ_SOFTBARRIER,      /* may not be passed by ioscheduler */
-        __REQ_HARDBARRIER,      /* may not be passed by drive either */
-        __REQ_FUA,              /* forced unit access */
-        __REQ_NOMERGE,          /* don't touch this for merging */
-        __REQ_STARTED,          /* drive already may have started this one */
-        __REQ_DONTPREP,         /* don't call prep for this one */
-        __REQ_QUEUED,           /* uses queueing */
-        __REQ_ELVPRIV,          /* elevator private data attached */
-        __REQ_FAILED,           /* set if the request failed */
-        __REQ_QUIET,            /* don't worry about errors */
-        __REQ_PREEMPT,          /* set for "ide_preempt" requests */
-        __REQ_ORDERED_COLOR,    /* is before or after barrier */
-        __REQ_RW_SYNC,          /* request is sync (sync write or read) */
-        __REQ_ALLOCED,          /* request came from our alloc pool */
-        __REQ_RW_META,          /* metadata io request */
-        __REQ_COPY_USER,        /* contains copies of user pages */
-        __REQ_INTEGRITY,        /* integrity metadata has been remapped */
-        __REQ_NOIDLE,           /* Don't anticipate more IO after this one */
-        __REQ_IO_STAT,          /* account I/O stat */
-        __REQ_MIXED_MERGE,      /* merge of different types, fail separately */
-        __REQ_NR_BITS,          /* stops here */
-};
-
-#define REQ_RW          (1 << __REQ_RW)
-#define REQ_FAILFAST_DEV        (1 << __REQ_FAILFAST_DEV)
-#define REQ_FAILFAST_TRANSPORT  (1 << __REQ_FAILFAST_TRANSPORT)
-#define REQ_FAILFAST_DRIVER     (1 << __REQ_FAILFAST_DRIVER)
-#define REQ_DISCARD     (1 << __REQ_DISCARD)
-#define REQ_SORTED      (1 << __REQ_SORTED)
-#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
-#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
-#define REQ_FUA         (1 << __REQ_FUA)
-#define REQ_NOMERGE     (1 << __REQ_NOMERGE)
-#define REQ_STARTED     (1 << __REQ_STARTED)
-#define REQ_DONTPREP    (1 << __REQ_DONTPREP)
-#define REQ_QUEUED      (1 << __REQ_QUEUED)
-#define REQ_ELVPRIV     (1 << __REQ_ELVPRIV)
-#define REQ_FAILED      (1 << __REQ_FAILED)
-#define REQ_QUIET       (1 << __REQ_QUIET)
-#define REQ_PREEMPT     (1 << __REQ_PREEMPT)
-#define REQ_ORDERED_COLOR       (1 << __REQ_ORDERED_COLOR)
-#define REQ_RW_SYNC     (1 << __REQ_RW_SYNC)
-#define REQ_ALLOCED     (1 << __REQ_ALLOCED)
-#define REQ_RW_META     (1 << __REQ_RW_META)
-#define REQ_COPY_USER   (1 << __REQ_COPY_USER)
-#define REQ_INTEGRITY   (1 << __REQ_INTEGRITY)
-#define REQ_NOIDLE      (1 << __REQ_NOIDLE)
-#define REQ_IO_STAT     (1 << __REQ_IO_STAT)
-#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
-
-#define REQ_FAILFAST_MASK       (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \
-                                 REQ_FAILFAST_DRIVER)
-
 #define BLK_MAX_CDB     16
 
 /*
@@ -264,6 +185,7 @@ struct request_pm_state
 typedef void (request_fn_proc) (struct request_queue *q);
 typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
 typedef int (prep_rq_fn) (struct request_queue *, struct request *);
+typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
 typedef void (unplug_fn) (struct request_queue *);
 
 struct bio_vec;
@@ -275,7 +197,6 @@ struct bvec_merge_data {
 };
 typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
                              struct bio_vec *);
-typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
 typedef void (softirq_done_fn)(struct request *);
 typedef int (dma_drain_needed_fn)(struct request *);
 typedef int (lld_busy_fn) (struct request_queue *q);
@@ -346,9 +267,9 @@ struct request_queue
         request_fn_proc         *request_fn;
         make_request_fn         *make_request_fn;
         prep_rq_fn              *prep_rq_fn;
+        unprep_rq_fn            *unprep_rq_fn;
         unplug_fn               *unplug_fn;
         merge_bvec_fn           *merge_bvec_fn;
-        prepare_flush_fn        *prepare_flush_fn;
         softirq_done_fn         *softirq_done_fn;
         rq_timed_out_fn         *rq_timed_out_fn;
         dma_drain_needed_fn     *dma_drain_needed;
@@ -467,11 +388,13 @@ struct request_queue
 #define QUEUE_FLAG_IO_STAT     15       /* do IO stats */
 #define QUEUE_FLAG_DISCARD     16       /* supports DISCARD */
 #define QUEUE_FLAG_NOXMERGES   17       /* No extended merges */
+#define QUEUE_FLAG_ADD_RANDOM  18       /* Contributes to random pool */
 
 #define QUEUE_FLAG_DEFAULT      ((1 << QUEUE_FLAG_IO_STAT) |            \
                                  (1 << QUEUE_FLAG_CLUSTER) |            \
                                  (1 << QUEUE_FLAG_STACKABLE)    |       \
-                                 (1 << QUEUE_FLAG_SAME_COMP))
+                                 (1 << QUEUE_FLAG_SAME_COMP)    |       \
+                                 (1 << QUEUE_FLAG_ADD_RANDOM))
 
 static inline int queue_is_locked(struct request_queue *q)
 {
@@ -596,38 +519,26 @@ enum {
         test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
 #define blk_queue_nonrot(q)     test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
 #define blk_queue_io_stat(q)    test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
+#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
 #define blk_queue_flushing(q)   ((q)->ordseq)
 #define blk_queue_stackable(q)  \
         test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
 #define blk_queue_discard(q)    test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
 
-#define blk_fs_request(rq)      ((rq)->cmd_type == REQ_TYPE_FS)
-#define blk_pc_request(rq)      ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
-#define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL)
-#define blk_sense_request(rq)   ((rq)->cmd_type == REQ_TYPE_SENSE)
-
-#define blk_failfast_dev(rq)    ((rq)->cmd_flags & REQ_FAILFAST_DEV)
-#define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT)
-#define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER)
-#define blk_noretry_request(rq) (blk_failfast_dev(rq) ||        \
-                                 blk_failfast_transport(rq) ||  \
-                                 blk_failfast_driver(rq))
-#define blk_rq_started(rq)      ((rq)->cmd_flags & REQ_STARTED)
-#define blk_rq_io_stat(rq)      ((rq)->cmd_flags & REQ_IO_STAT)
-#define blk_rq_quiet(rq)        ((rq)->cmd_flags & REQ_QUIET)
-
-#define blk_account_rq(rq)      (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) 
-
-#define blk_pm_suspend_request(rq)      ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND)
-#define blk_pm_resume_request(rq)       ((rq)->cmd_type == REQ_TYPE_PM_RESUME)
+#define blk_noretry_request(rq) \
+        ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
+                             REQ_FAILFAST_DRIVER))
+
+#define blk_account_rq(rq) \
+        (((rq)->cmd_flags & REQ_STARTED) && \
+         ((rq)->cmd_type == REQ_TYPE_FS || \
+          ((rq)->cmd_flags & REQ_DISCARD)))
+
 #define blk_pm_request(rq)      \
-        (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
+        ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
+         (rq)->cmd_type == REQ_TYPE_PM_RESUME)
 
 #define blk_rq_cpu_valid(rq)    ((rq)->cpu != -1)
-#define blk_sorted_rq(rq)       ((rq)->cmd_flags & REQ_SORTED)
-#define blk_barrier_rq(rq)      ((rq)->cmd_flags & REQ_HARDBARRIER)
-#define blk_fua_rq(rq)          ((rq)->cmd_flags & REQ_FUA)
-#define blk_discard_rq(rq)      ((rq)->cmd_flags & REQ_DISCARD)
 #define blk_bidi_rq(rq)         ((rq)->next_rq != NULL)
 /* rq->queuelist of dequeued request must be list_empty() */
 #define blk_queued_rq(rq)       (!list_empty(&(rq)->queuelist))
@@ -641,7 +552,7 @@ enum {
  */
 static inline bool rw_is_sync(unsigned int rw_flags)
 {
-        return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC);
+        return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
 }
 
 static inline bool rq_is_sync(struct request *rq)
@@ -649,9 +560,6 @@ static inline bool rq_is_sync(struct request *rq)
         return rw_is_sync(rq->cmd_flags);
 }
 
-#define rq_is_meta(rq)          ((rq)->cmd_flags & REQ_RW_META)
-#define rq_noidle(rq)           ((rq)->cmd_flags & REQ_NOIDLE)
-
 static inline int blk_queue_full(struct request_queue *q, int sync)
 {
         if (sync)
@@ -684,7 +592,8 @@ static inline void blk_clear_queue_full(struct request_queue *q, int sync)
         (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER)
 #define rq_mergeable(rq)        \
         (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
-         (blk_discard_rq(rq) || blk_fs_request((rq))))
+         (((rq)->cmd_flags & REQ_DISCARD) || \
+          (rq)->cmd_type == REQ_TYPE_FS))
 
 /*
  * q->prep_rq_fn return values
@@ -709,7 +618,7 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
 #define BLK_BOUNCE_HIGH         -1ULL
 #endif
 #define BLK_BOUNCE_ANY          (-1ULL)
-#define BLK_BOUNCE_ISA          (ISA_DMA_THRESHOLD)
+#define BLK_BOUNCE_ISA          (DMA_BIT_MASK(24))
 
 /*
  * default timeout for SG_IO if none specified
@@ -781,6 +690,8 @@ extern struct request *blk_make_request(struct request_queue *, struct bio *,
                                         gfp_t);
 extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
 extern void blk_requeue_request(struct request_queue *, struct request *);
+extern void blk_add_request_payload(struct request *rq, struct page *page,
+                unsigned int len);
 extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
 extern int blk_lld_busy(struct request_queue *q);
 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
@@ -915,6 +826,7 @@ extern void blk_complete_request(struct request *);
 extern void __blk_complete_request(struct request *);
 extern void blk_abort_request(struct request *);
 extern void blk_abort_queue(struct request_queue *);
+extern void blk_unprep_request(struct request *);
 
 /*
  * Access functions for manipulating queue properties
@@ -959,6 +871,7 @@ extern int blk_queue_dma_drain(struct request_queue *q,
 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
+extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
 extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
 extern void blk_queue_dma_alignment(struct request_queue *, int);
 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
@@ -966,7 +879,7 @@ extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
-extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
+extern int blk_queue_ordered(struct request_queue *, unsigned);
 extern bool blk_do_ordered(struct request_queue *, struct request **);
 extern unsigned blk_ordered_cur_seq(struct request_queue *);
 extern unsigned blk_ordered_req_seq(struct request *);
@@ -1020,7 +933,7 @@ static inline int sb_issue_discard(struct super_block *sb,
 {
         block <<= (sb->s_blocksize_bits - 9);
         nr_blocks <<= (sb->s_blocksize_bits - 9);
-        return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL,
+        return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_NOFS,
                                    BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
 }
 
@@ -1333,7 +1246,6 @@ static inline int blk_integrity_rq(struct request *rq)
 struct block_device_operations {
         int (*open) (struct block_device *, fmode_t);
         int (*release) (struct gendisk *, fmode_t);
-        int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
         int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
         int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
         int (*direct_access) (struct block_device *, sector_t,
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 416bf62d6d46..3395cf7130f5 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -5,6 +5,7 @@
 #ifdef __KERNEL__
 #include <linux/blkdev.h>
 #include <linux/relay.h>
+#include <linux/compat.h>
 #endif
 
 /*
@@ -220,11 +221,26 @@ static inline int blk_trace_init_sysfs(struct device *dev)
 
 #endif /* CONFIG_BLK_DEV_IO_TRACE */
 
+#ifdef CONFIG_COMPAT
+
+struct compat_blk_user_trace_setup {
+        char name[32];
+        u16 act_mask;
+        u32 buf_size;
+        u32 buf_nr;
+        compat_u64 start_lba;
+        compat_u64 end_lba;
+        u32 pid;
+};
+#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
+
+#endif
+
 #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
 
 static inline int blk_cmd_buf_len(struct request *rq)
 {
-        return blk_pc_request(rq) ? rq->cmd_len * 3 : 1;
+        return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
 }
 
 extern void blk_dump_cmd(char *buf, struct request *rq);
diff --git a/include/linux/coda_psdev.h b/include/linux/coda_psdev.h
index 8859e2ede9fe..284b520934a0 100644
--- a/include/linux/coda_psdev.h
+++ b/include/linux/coda_psdev.h
@@ -86,9 +86,9 @@ struct upc_req {
         wait_queue_head_t   uc_sleep;   /* process' wait queue */
 };
 
-#define REQ_ASYNC  0x1
-#define REQ_READ   0x2
-#define REQ_WRITE  0x4
-#define REQ_ABORT  0x8
+#define CODA_REQ_ASYNC  0x1
+#define CODA_REQ_READ   0x2
+#define CODA_REQ_WRITE  0x4
+#define CODA_REQ_ABORT  0x8
 
 #endif
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index b8d2516668aa..479ee3a1d901 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -53,7 +53,7 @@
 
 
 extern const char *drbd_buildtag(void);
-#define REL_VERSION "8.3.8"
+#define REL_VERSION "8.3.8.1"
 #define API_VERSION 88
 #define PRO_VERSION_MIN 86
 #define PRO_VERSION_MAX 94
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index ce77a746fc9d..5f042810a56c 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -78,10 +78,11 @@ NL_PACKET(syncer_conf, 8,
         NL_INTEGER(     30,     T_MAY_IGNORE,   rate)
         NL_INTEGER(     31,     T_MAY_IGNORE,   after)
         NL_INTEGER(     32,     T_MAY_IGNORE,   al_extents)
-        NL_INTEGER(     71,     T_MAY_IGNORE,   dp_volume)
-        NL_INTEGER(     72,     T_MAY_IGNORE,   dp_interval)
-        NL_INTEGER(     73,     T_MAY_IGNORE,   throttle_th)
-        NL_INTEGER(     74,     T_MAY_IGNORE,   hold_off_th)
+/*      NL_INTEGER(     71,     T_MAY_IGNORE,   dp_volume)
+ *      NL_INTEGER(     72,     T_MAY_IGNORE,   dp_interval)
+ *      NL_INTEGER(     73,     T_MAY_IGNORE,   throttle_th)
+ *      NL_INTEGER(     74,     T_MAY_IGNORE,   hold_off_th)
+ * feature will be reimplemented differently with 8.3.9 */
         NL_STRING(      52,     T_MAY_IGNORE,   verify_alg,     SHARED_SECRET_MAX)
         NL_STRING(      51,     T_MAY_IGNORE,   cpu_mask,       32)
         NL_STRING(      64,     T_MAY_IGNORE,   csums_alg,      SHARED_SECRET_MAX)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a8ccf85b8691..1542e0e52b2e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -8,6 +8,7 @@
 
 #include <linux/limits.h>
 #include <linux/ioctl.h>
+#include <linux/blk_types.h>
 
 /*
  * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
@@ -121,7 +122,7 @@ struct inodes_stat_t {
  *                      immediately wait on this read without caring about
  *                      unplugging.
  * READA                Used for read-ahead operations. Lower priority, and the
- *                       block layer could (in theory) choose to ignore this
+ *                      block layer could (in theory) choose to ignore this
  *                      request if it runs into resource problems.
  * WRITE                A normal async write. Device will be plugged.
  * SWRITE               Like WRITE, but a special case for ll_rw_block() that
@@ -140,7 +141,7 @@ struct inodes_stat_t {
  * SWRITE_SYNC
  * SWRITE_SYNC_PLUG     Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
  *                      See SWRITE.
- * WRITE_BARRIER        Like WRITE, but tells the block layer that all
+ * WRITE_BARRIER        Like WRITE_SYNC, but tells the block layer that all
  *                      previously submitted writes must be safely on storage
  *                      before this one is started. Also guarantees that when
  *                      this write is complete, it itself is also safely on
@@ -148,29 +149,31 @@ struct inodes_stat_t {
  *                      of this IO.
  *
  */
-#define RW_MASK         1
-#define RWA_MASK        2
-#define READ 0
-#define WRITE 1
-#define READA 2         /* read-ahead  - don't block if no resources */
-#define SWRITE 3        /* for ll_rw_block() - wait for buffer lock */
-#define READ_SYNC       (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
-#define READ_META       (READ | (1 << BIO_RW_META))
-#define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
-#define WRITE_SYNC      (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
-#define WRITE_ODIRECT_PLUG      (WRITE | (1 << BIO_RW_SYNCIO))
-#define WRITE_META      (WRITE | (1 << BIO_RW_META))
-#define SWRITE_SYNC_PLUG        \
-                        (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
-#define SWRITE_SYNC     (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
-#define WRITE_BARRIER   (WRITE | (1 << BIO_RW_BARRIER))
+#define RW_MASK                 REQ_WRITE
+#define RWA_MASK                REQ_RAHEAD
+
+#define READ                    0
+#define WRITE                   RW_MASK
+#define READA                   RWA_MASK
+#define SWRITE                  (WRITE | READA)
+
+#define READ_SYNC               (READ | REQ_SYNC | REQ_UNPLUG)
+#define READ_META               (READ | REQ_META)
+#define WRITE_SYNC_PLUG         (WRITE | REQ_SYNC | REQ_NOIDLE)
+#define WRITE_SYNC              (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
+#define WRITE_ODIRECT_PLUG      (WRITE | REQ_SYNC)
+#define WRITE_META              (WRITE | REQ_META)
+#define WRITE_BARRIER           (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
+                                 REQ_HARDBARRIER)
+#define SWRITE_SYNC_PLUG        (SWRITE | REQ_SYNC | REQ_NOIDLE)
+#define SWRITE_SYNC             (SWRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
 
 /*
  * These aren't really reads or writes, they pass down information about
  * parts of device that are now unused by the file system.
  */
-#define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
-#define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))
+#define DISCARD_NOBARRIER       (WRITE | REQ_DISCARD)
+#define DISCARD_BARRIER         (WRITE | REQ_DISCARD | REQ_HARDBARRIER)
 
 #define SEL_IN          1
 #define SEL_OUT         2
@@ -2196,7 +2199,6 @@ static inline void insert_inode_hash(struct inode *inode) {
 extern void file_move(struct file *f, struct list_head *list);
 extern void file_kill(struct file *f);
 #ifdef CONFIG_BLOCK
-struct bio;
 extern void submit_bio(int, struct bio *);
 extern int bdev_read_only(struct block_device *);
 #endif
@@ -2263,7 +2265,6 @@ static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
 #endif
 
 #ifdef CONFIG_BLOCK
-struct bio;
 typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
                             loff_t file_offset);
 
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index d870a918559c..d8ce278515c3 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -25,8 +25,10 @@ DECLARE_EVENT_CLASS(block_rq_with_error,
 
         TP_fast_assign(
                 __entry->dev       = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
-                __entry->sector    = blk_pc_request(rq) ? 0 : blk_rq_pos(rq);
-                __entry->nr_sector = blk_pc_request(rq) ? 0 : blk_rq_sectors(rq);
+                __entry->sector    = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                        0 : blk_rq_pos(rq);
+                __entry->nr_sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                        0 : blk_rq_sectors(rq);
                 __entry->errors    = rq->errors;
 
                 blk_fill_rwbs_rq(__entry->rwbs, rq);
@@ -109,9 +111,12 @@ DECLARE_EVENT_CLASS(block_rq,
 
         TP_fast_assign(
                 __entry->dev       = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
-                __entry->sector    = blk_pc_request(rq) ? 0 : blk_rq_pos(rq);
-                __entry->nr_sector = blk_pc_request(rq) ? 0 : blk_rq_sectors(rq);
-                __entry->bytes     = blk_pc_request(rq) ? blk_rq_bytes(rq) : 0;
+                __entry->sector    = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                        0 : blk_rq_pos(rq);
+                __entry->nr_sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                        0 : blk_rq_sectors(rq);
+                __entry->bytes     = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
+                                        blk_rq_bytes(rq) : 0;
 
                 blk_fill_rwbs_rq(__entry->rwbs, rq);
                 blk_dump_cmd(__get_str(cmd), rq);
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
new file mode 100644
index 000000000000..f345f66ae9d1
--- /dev/null
+++ b/include/trace/events/writeback.h
@@ -0,0 +1,159 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM writeback
+
+#if !defined(_TRACE_WRITEBACK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_WRITEBACK_H
+
+#include <linux/backing-dev.h>
+#include <linux/device.h>
+#include <linux/writeback.h>
+
+struct wb_writeback_work;
+
+DECLARE_EVENT_CLASS(writeback_work_class,
+        TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
+        TP_ARGS(bdi, work),
+        TP_STRUCT__entry(
+                __array(char, name, 32)
+                __field(long, nr_pages)
+                __field(dev_t, sb_dev)
+                __field(int, sync_mode)
+                __field(int, for_kupdate)
+                __field(int, range_cyclic)
+                __field(int, for_background)
+        ),
+        TP_fast_assign(
+                strncpy(__entry->name, dev_name(bdi->dev), 32);
+                __entry->nr_pages = work->nr_pages;
+                __entry->sb_dev = work->sb ? work->sb->s_dev : 0;
+                __entry->sync_mode = work->sync_mode;
+                __entry->for_kupdate = work->for_kupdate;
+                __entry->range_cyclic = work->range_cyclic;
+                __entry->for_background = work->for_background;
+        ),
+        TP_printk("bdi %s: sb_dev %d:%d nr_pages=%ld sync_mode=%d "
+                  "kupdate=%d range_cyclic=%d background=%d",
+                  __entry->name,
+                  MAJOR(__entry->sb_dev), MINOR(__entry->sb_dev),
+                  __entry->nr_pages,
+                  __entry->sync_mode,
+                  __entry->for_kupdate,
+                  __entry->range_cyclic,
+                  __entry->for_background
+        )
+);
+#define DEFINE_WRITEBACK_WORK_EVENT(name) \
+DEFINE_EVENT(writeback_work_class, name, \
+        TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work), \
+        TP_ARGS(bdi, work))
+DEFINE_WRITEBACK_WORK_EVENT(writeback_nothread);
+DEFINE_WRITEBACK_WORK_EVENT(writeback_queue);
+DEFINE_WRITEBACK_WORK_EVENT(writeback_exec);
+
+TRACE_EVENT(writeback_pages_written,
+        TP_PROTO(long pages_written),
+        TP_ARGS(pages_written),
+        TP_STRUCT__entry(
+                __field(long,           pages)
+        ),
+        TP_fast_assign(
+                __entry->pages          = pages_written;
+        ),
+        TP_printk("%ld", __entry->pages)
+);
+
+DECLARE_EVENT_CLASS(writeback_class,
+        TP_PROTO(struct backing_dev_info *bdi),
+        TP_ARGS(bdi),
+        TP_STRUCT__entry(
+                __array(char, name, 32)
+        ),
+        TP_fast_assign(
+                strncpy(__entry->name, dev_name(bdi->dev), 32);
+        ),
+        TP_printk("bdi %s",
+                  __entry->name
+        )
+);
+#define DEFINE_WRITEBACK_EVENT(name) \
+DEFINE_EVENT(writeback_class, name, \
+        TP_PROTO(struct backing_dev_info *bdi), \
+        TP_ARGS(bdi))
+
+DEFINE_WRITEBACK_EVENT(writeback_nowork);
+DEFINE_WRITEBACK_EVENT(writeback_wake_thread);
+DEFINE_WRITEBACK_EVENT(writeback_wake_forker_thread);
+DEFINE_WRITEBACK_EVENT(writeback_bdi_register);
+DEFINE_WRITEBACK_EVENT(writeback_bdi_unregister);
+DEFINE_WRITEBACK_EVENT(writeback_thread_start);
+DEFINE_WRITEBACK_EVENT(writeback_thread_stop);
+
+DECLARE_EVENT_CLASS(wbc_class,
+        TP_PROTO(struct writeback_control *wbc, struct backing_dev_info *bdi),
+        TP_ARGS(wbc, bdi),
+        TP_STRUCT__entry(
+                __array(char, name, 32)
+                __field(long, nr_to_write)
+                __field(long, pages_skipped)
+                __field(int, sync_mode)
+                __field(int, nonblocking)
+                __field(int, encountered_congestion)
+                __field(int, for_kupdate)
+                __field(int, for_background)
+                __field(int, for_reclaim)
+                __field(int, range_cyclic)
+                __field(int, more_io)
+                __field(unsigned long, older_than_this)
+                __field(long, range_start)
+                __field(long, range_end)
+        ),
+
+        TP_fast_assign(
+                strncpy(__entry->name, dev_name(bdi->dev), 32);
+                __entry->nr_to_write    = wbc->nr_to_write;
+                __entry->pages_skipped  = wbc->pages_skipped;
+                __entry->sync_mode      = wbc->sync_mode;
+                __entry->for_kupdate    = wbc->for_kupdate;
+                __entry->for_background = wbc->for_background;
+                __entry->for_reclaim    = wbc->for_reclaim;
+                __entry->range_cyclic   = wbc->range_cyclic;
+                __entry->more_io        = wbc->more_io;
+                __entry->older_than_this = wbc->older_than_this ?
+                                                *wbc->older_than_this : 0;
+                __entry->range_start    = (long)wbc->range_start;
+                __entry->range_end      = (long)wbc->range_end;
+        ),
+
+        TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d "
+                "bgrd=%d reclm=%d cyclic=%d more=%d older=0x%lx "
+                "start=0x%lx end=0x%lx",
+                __entry->name,
+                __entry->nr_to_write,
+                __entry->pages_skipped,
+                __entry->sync_mode,
+                __entry->for_kupdate,
+                __entry->for_background,
+                __entry->for_reclaim,
+                __entry->range_cyclic,
+                __entry->more_io,
+                __entry->older_than_this,
+                __entry->range_start,
+                __entry->range_end)
+)
+
+#define DEFINE_WBC_EVENT(name) \
+DEFINE_EVENT(wbc_class, name, \
+        TP_PROTO(struct writeback_control *wbc, struct backing_dev_info *bdi), \
+        TP_ARGS(wbc, bdi))
+DEFINE_WBC_EVENT(wbc_writeback_start);
+DEFINE_WBC_EVENT(wbc_writeback_written);
+DEFINE_WBC_EVENT(wbc_writeback_wait);
+DEFINE_WBC_EVENT(wbc_balance_dirty_start);
+DEFINE_WBC_EVENT(wbc_balance_dirty_written);
+DEFINE_WBC_EVENT(wbc_balance_dirty_wait);
+DEFINE_WBC_EVENT(wbc_writepage);
+
+#endif /* _TRACE_WRITEBACK_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/power/block_io.c b/kernel/power/block_io.c
index 97024fd40cd5..83bbc7c02df9 100644
--- a/kernel/power/block_io.c
+++ b/kernel/power/block_io.c
@@ -28,7 +28,7 @@
 static int submit(int rw, struct block_device *bdev, sector_t sector,
                 struct page *page, struct bio **bio_chain)
 {
-        const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+        const int bio_rw = rw | REQ_SYNC | REQ_UNPLUG;
         struct bio *bio;
 
         bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 638711c17504..82499a5bdcb7 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -169,9 +169,12 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
 static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
                                  BLK_TC_ACT(BLK_TC_WRITE) };
 
+#define BLK_TC_HARDBARRIER      BLK_TC_BARRIER
+#define BLK_TC_RAHEAD           BLK_TC_AHEAD
+
 /* The ilog2() calls fall out because they're constant */
-#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
-          (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name))
+#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
+          (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name))
 
 /*
  * The worker for the various blk_add_trace*() types. Fills out a
@@ -194,9 +197,9 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
                 return;
 
         what |= ddir_act[rw & WRITE];
-        what |= MASK_TC_BIT(rw, BARRIER);
-        what |= MASK_TC_BIT(rw, SYNCIO);
-        what |= MASK_TC_BIT(rw, AHEAD);
+        what |= MASK_TC_BIT(rw, HARDBARRIER);
+        what |= MASK_TC_BIT(rw, SYNC);
+        what |= MASK_TC_BIT(rw, RAHEAD);
         what |= MASK_TC_BIT(rw, META);
         what |= MASK_TC_BIT(rw, DISCARD);
 
@@ -549,6 +552,41 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 }
 EXPORT_SYMBOL_GPL(blk_trace_setup);
 
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+static int compat_blk_trace_setup(struct request_queue *q, char *name,
+                                  dev_t dev, struct block_device *bdev,
+                                  char __user *arg)
+{
+        struct blk_user_trace_setup buts;
+        struct compat_blk_user_trace_setup cbuts;
+        int ret;
+
+        if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
+                return -EFAULT;
+
+        buts = (struct blk_user_trace_setup) {
+                .act_mask = cbuts.act_mask,
+                .buf_size = cbuts.buf_size,
+                .buf_nr = cbuts.buf_nr,
+                .start_lba = cbuts.start_lba,
+                .end_lba = cbuts.end_lba,
+                .pid = cbuts.pid,
+        };
+        memcpy(&buts.name, &cbuts.name, 32);
+
+        ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
+        if (ret)
+                return ret;
+
+        if (copy_to_user(arg, &buts.name, 32)) {
+                blk_trace_remove(q);
+                return -EFAULT;
+        }
+
+        return 0;
+}
+#endif
+
 int blk_trace_startstop(struct request_queue *q, int start)
 {
         int ret;
@@ -601,6 +639,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
         if (!q)
                 return -ENXIO;
 
+        lock_kernel();
         mutex_lock(&bdev->bd_mutex);
 
         switch (cmd) {
@@ -608,6 +647,12 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
                 bdevname(bdev, b);
                 ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
                 break;
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+        case BLKTRACESETUP32:
+                bdevname(bdev, b);
+                ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
+                break;
+#endif
         case BLKTRACESTART:
                 start = 1;
         case BLKTRACESTOP:
@@ -622,6 +667,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
         }
 
         mutex_unlock(&bdev->bd_mutex);
+        unlock_kernel();
         return ret;
 }
 
@@ -661,10 +707,10 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
         if (likely(!bt))
                 return;
 
-        if (blk_discard_rq(rq))
-                rw |= (1 << BIO_RW_DISCARD);
+        if (rq->cmd_flags & REQ_DISCARD)
+                rw |= REQ_DISCARD;
 
-        if (blk_pc_request(rq)) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 what |= BLK_TC_ACT(BLK_TC_PC);
                 __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
                                 what, rq->errors, rq->cmd_len, rq->cmd);
@@ -925,7 +971,7 @@ void blk_add_driver_data(struct request_queue *q,
         if (likely(!bt))
                 return;
 
-        if (blk_pc_request(rq))
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
                 __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
                                 BLK_TA_DRV_DATA, rq->errors, len, data);
         else
@@ -1730,7 +1776,7 @@ void blk_dump_cmd(char *buf, struct request *rq)
         int len = rq->cmd_len;
         unsigned char *cmd = rq->cmd;
 
-        if (!blk_pc_request(rq)) {
+        if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
                 buf[0] = '\0';
                 return;
         }
@@ -1755,20 +1801,20 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
 
         if (rw & WRITE)
                 rwbs[i++] = 'W';
-        else if (rw & 1 << BIO_RW_DISCARD)
+        else if (rw & REQ_DISCARD)
                 rwbs[i++] = 'D';
         else if (bytes)
                 rwbs[i++] = 'R';
         else
                 rwbs[i++] = 'N';
 
-        if (rw & 1 << BIO_RW_AHEAD)
+        if (rw & REQ_RAHEAD)
                 rwbs[i++] = 'A';
-        if (rw & 1 << BIO_RW_BARRIER)
+        if (rw & REQ_HARDBARRIER)
                 rwbs[i++] = 'B';
-        if (rw & 1 << BIO_RW_SYNCIO)
+        if (rw & REQ_SYNC)
                 rwbs[i++] = 'S';
-        if (rw & 1 << BIO_RW_META)
+        if (rw & REQ_META)
                 rwbs[i++] = 'M';
 
         rwbs[i] = '\0';
@@ -1779,8 +1825,8 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
         int rw = rq->cmd_flags & 0x03;
         int bytes;
 
-        if (blk_discard_rq(rq))
-                rw |= (1 << BIO_RW_DISCARD);
+        if (rq->cmd_flags & REQ_DISCARD)
+                rw |= REQ_DISCARD;
 
         bytes = blk_rq_bytes(rq);
 
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f9fd3dd3916b..08d357522e78 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/writeback.h>
 #include <linux/device.h>
+#include <trace/events/writeback.h>
 
 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 
@@ -49,8 +50,6 @@ static struct timer_list sync_supers_timer;
 static int bdi_sync_supers(void *);
 static void sync_supers_timer_fn(unsigned long);
 
-static void bdi_add_default_flusher_task(struct backing_dev_info *bdi);
-
 #ifdef CONFIG_DEBUG_FS
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
@@ -65,28 +64,21 @@ static void bdi_debug_init(void)
 static int bdi_debug_stats_show(struct seq_file *m, void *v)
 {
         struct backing_dev_info *bdi = m->private;
-        struct bdi_writeback *wb;
+        struct bdi_writeback *wb = &bdi->wb;
         unsigned long background_thresh;
         unsigned long dirty_thresh;
         unsigned long bdi_thresh;
         unsigned long nr_dirty, nr_io, nr_more_io, nr_wb;
         struct inode *inode;
 
-        /*
-         * inode lock is enough here, the bdi->wb_list is protected by
-         * RCU on the reader side
-         */
         nr_wb = nr_dirty = nr_io = nr_more_io = 0;
         spin_lock(&inode_lock);
-        list_for_each_entry(wb, &bdi->wb_list, list) {
-                nr_wb++;
-                list_for_each_entry(inode, &wb->b_dirty, i_list)
-                        nr_dirty++;
-                list_for_each_entry(inode, &wb->b_io, i_list)
-                        nr_io++;
-                list_for_each_entry(inode, &wb->b_more_io, i_list)
-                        nr_more_io++;
-        }
+        list_for_each_entry(inode, &wb->b_dirty, i_list)
+                nr_dirty++;
+        list_for_each_entry(inode, &wb->b_io, i_list)
+                nr_io++;
+        list_for_each_entry(inode, &wb->b_more_io, i_list)
+                nr_more_io++;
         spin_unlock(&inode_lock);
 
         get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi);
@@ -98,19 +90,16 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
                    "BdiDirtyThresh:   %8lu kB\n"
                    "DirtyThresh:      %8lu kB\n"
                    "BackgroundThresh: %8lu kB\n"
-                   "WritebackThreads: %8lu\n"
                    "b_dirty:          %8lu\n"
                    "b_io:             %8lu\n"
                    "b_more_io:        %8lu\n"
                    "bdi_list:         %8u\n"
-                   "state:            %8lx\n"
-                   "wb_list:          %8u\n",
+                   "state:            %8lx\n",
                    (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
                    (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
                    K(bdi_thresh), K(dirty_thresh),
-                   K(background_thresh), nr_wb, nr_dirty, nr_io, nr_more_io,
-                   !list_empty(&bdi->bdi_list), bdi->state,
-                   !list_empty(&bdi->wb_list));
+                   K(background_thresh), nr_dirty, nr_io, nr_more_io,
+                   !list_empty(&bdi->bdi_list), bdi->state);
 #undef K
 
         return 0;
@@ -247,7 +236,6 @@ static int __init default_bdi_init(void)
         sync_supers_tsk = kthread_run(bdi_sync_supers, NULL, "sync_supers");
         BUG_ON(IS_ERR(sync_supers_tsk));
 
-        init_timer(&sync_supers_timer);
         setup_timer(&sync_supers_timer, sync_supers_timer_fn, 0);
         bdi_arm_supers_timer();
 
@@ -259,77 +247,6 @@ static int __init default_bdi_init(void)
 }
 subsys_initcall(default_bdi_init);
 
-static void bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
-{
-        memset(wb, 0, sizeof(*wb));
-
-        wb->bdi = bdi;
-        wb->last_old_flush = jiffies;
-        INIT_LIST_HEAD(&wb->b_dirty);
-        INIT_LIST_HEAD(&wb->b_io);
-        INIT_LIST_HEAD(&wb->b_more_io);
-}
-
-static void bdi_task_init(struct backing_dev_info *bdi,
-                          struct bdi_writeback *wb)
-{
-        struct task_struct *tsk = current;
-
-        spin_lock(&bdi->wb_lock);
-        list_add_tail_rcu(&wb->list, &bdi->wb_list);
-        spin_unlock(&bdi->wb_lock);
-
-        tsk->flags |= PF_FLUSHER | PF_SWAPWRITE;
-        set_freezable();
-
-        /*
-         * Our parent may run at a different priority, just set us to normal
-         */
-        set_user_nice(tsk, 0);
-}
-
-static int bdi_start_fn(void *ptr)
-{
-        struct bdi_writeback *wb = ptr;
-        struct backing_dev_info *bdi = wb->bdi;
-        int ret;
-
-        /*
-         * Add us to the active bdi_list
-         */
-        spin_lock_bh(&bdi_lock);
-        list_add_rcu(&bdi->bdi_list, &bdi_list);
-        spin_unlock_bh(&bdi_lock);
-
-        bdi_task_init(bdi, wb);
-
-        /*
-         * Clear pending bit and wakeup anybody waiting to tear us down
-         */
-        clear_bit(BDI_pending, &bdi->state);
-        smp_mb__after_clear_bit();
-        wake_up_bit(&bdi->state, BDI_pending);
-
-        ret = bdi_writeback_task(wb);
-
-        /*
-         * Remove us from the list
-         */
-        spin_lock(&bdi->wb_lock);
-        list_del_rcu(&wb->list);
-        spin_unlock(&bdi->wb_lock);
-
-        /*
-         * Flush any work that raced with us exiting. No new work
-         * will be added, since this bdi isn't discoverable anymore.
-         */
-        if (!list_empty(&bdi->work_list))
-                wb_do_writeback(wb, 1);
-
-        wb->task = NULL;
-        return ret;
-}
-
 int bdi_has_dirty_io(struct backing_dev_info *bdi)
 {
         return wb_has_dirty_io(&bdi->wb);
@@ -348,10 +265,10 @@ static void bdi_flush_io(struct backing_dev_info *bdi)
 }
 
 /*
- * kupdated() used to do this. We cannot do it from the bdi_forker_task()
+ * kupdated() used to do this. We cannot do it from the bdi_forker_thread()
  * or we risk deadlocking on ->s_umount. The longer term solution would be
  * to implement sync_supers_bdi() or similar and simply do it from the
- * bdi writeback tasks individually.
+ * bdi writeback thread individually.
  */
 static int bdi_sync_supers(void *unused)
 {
@@ -387,144 +304,198 @@ static void sync_supers_timer_fn(unsigned long unused)
         bdi_arm_supers_timer();
 }
 
-static int bdi_forker_task(void *ptr)
+static void wakeup_timer_fn(unsigned long data)
+{
+        struct backing_dev_info *bdi = (struct backing_dev_info *)data;
+
+        spin_lock_bh(&bdi->wb_lock);
+        if (bdi->wb.task) {
+                trace_writeback_wake_thread(bdi);
+                wake_up_process(bdi->wb.task);
+        } else {
+                /*
+                 * When bdi tasks are inactive for long time, they are killed.
+                 * In this case we have to wake-up the forker thread which
+                 * should create and run the bdi thread.
+                 */
+                trace_writeback_wake_forker_thread(bdi);
+                wake_up_process(default_backing_dev_info.wb.task);
+        }
+        spin_unlock_bh(&bdi->wb_lock);
+}
+
+/*
+ * This function is used when the first inode for this bdi is marked dirty. It
+ * wakes-up the corresponding bdi thread which should then take care of the
+ * periodic background write-out of dirty inodes. Since the write-out would
+ * starts only 'dirty_writeback_interval' centisecs from now anyway, we just
+ * set up a timer which wakes the bdi thread up later.
+ *
+ * Note, we wouldn't bother setting up the timer, but this function is on the
+ * fast-path (used by '__mark_inode_dirty()'), so we save few context switches
+ * by delaying the wake-up.
+ */
+void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi)
+{
+        unsigned long timeout;
+
+        timeout = msecs_to_jiffies(dirty_writeback_interval * 10);
+        mod_timer(&bdi->wb.wakeup_timer, jiffies + timeout);
+}
+
+/*
+ * Calculate the longest interval (jiffies) bdi threads are allowed to be
+ * inactive.
+ */
+static unsigned long bdi_longest_inactive(void)
+{
+        unsigned long interval;
+
+        interval = msecs_to_jiffies(dirty_writeback_interval * 10);
+        return max(5UL * 60 * HZ, interval);
+}
+
+static int bdi_forker_thread(void *ptr)
 {
         struct bdi_writeback *me = ptr;
 
-        bdi_task_init(me->bdi, me);
+        current->flags |= PF_FLUSHER | PF_SWAPWRITE;
+        set_freezable();
+
+        /*
+         * Our parent may run at a different priority, just set us to normal
+         */
+        set_user_nice(current, 0);
 
         for (;;) {
-                struct backing_dev_info *bdi, *tmp;
-                struct bdi_writeback *wb;
+                struct task_struct *task = NULL;
+                struct backing_dev_info *bdi;
+                enum {
+                        NO_ACTION,   /* Nothing to do */
+                        FORK_THREAD, /* Fork bdi thread */
+                        KILL_THREAD, /* Kill inactive bdi thread */
+                } action = NO_ACTION;
 
                 /*
                  * Temporary measure, we want to make sure we don't see
                  * dirty data on the default backing_dev_info
                  */
-                if (wb_has_dirty_io(me) || !list_empty(&me->bdi->work_list))
+                if (wb_has_dirty_io(me) || !list_empty(&me->bdi->work_list)) {
+                        del_timer(&me->wakeup_timer);
                         wb_do_writeback(me, 0);
+                }
 
                 spin_lock_bh(&bdi_lock);
+                set_current_state(TASK_INTERRUPTIBLE);
 
-                /*
-                 * Check if any existing bdi's have dirty data without
-                 * a thread registered. If so, set that up.
-                 */
-                list_for_each_entry_safe(bdi, tmp, &bdi_list, bdi_list) {
-                        if (bdi->wb.task)
-                                continue;
-                        if (list_empty(&bdi->work_list) &&
-                            !bdi_has_dirty_io(bdi))
+                list_for_each_entry(bdi, &bdi_list, bdi_list) {
+                        bool have_dirty_io;
+
+                        if (!bdi_cap_writeback_dirty(bdi) ||
+                             bdi_cap_flush_forker(bdi))
                                 continue;
 
-                        bdi_add_default_flusher_task(bdi);
-                }
+                        WARN(!test_bit(BDI_registered, &bdi->state),
+                             "bdi %p/%s is not registered!\n", bdi, bdi->name);
 
-                set_current_state(TASK_INTERRUPTIBLE);
+                        have_dirty_io = !list_empty(&bdi->work_list) ||
+                                        wb_has_dirty_io(&bdi->wb);
 
-                if (list_empty(&bdi_pending_list)) {
-                        unsigned long wait;
+                        /*
+                         * If the bdi has work to do, but the thread does not
+                         * exist - create it.
+                         */
+                        if (!bdi->wb.task && have_dirty_io) {
+                                /*
+                                 * Set the pending bit - if someone will try to
+                                 * unregister this bdi - it'll wait on this bit.
+                                 */
+                                set_bit(BDI_pending, &bdi->state);
+                                action = FORK_THREAD;
+                                break;
+                        }
+
+                        spin_lock(&bdi->wb_lock);
+
+                        /*
+                         * If there is no work to do and the bdi thread was
+                         * inactive long enough - kill it. The wb_lock is taken
+                         * to make sure no-one adds more work to this bdi and
+                         * wakes the bdi thread up.
+                         */
+                        if (bdi->wb.task && !have_dirty_io &&
+                            time_after(jiffies, bdi->wb.last_active +
+                                                bdi_longest_inactive())) {
+                                task = bdi->wb.task;
+                                bdi->wb.task = NULL;
+                                spin_unlock(&bdi->wb_lock);
+                                set_bit(BDI_pending, &bdi->state);
+                                action = KILL_THREAD;
+                                break;
+                        }
+                        spin_unlock(&bdi->wb_lock);
+                }
+                spin_unlock_bh(&bdi_lock);
 
-                        spin_unlock_bh(&bdi_lock);
-                        wait = msecs_to_jiffies(dirty_writeback_interval * 10);
-                        if (wait)
-                                schedule_timeout(wait);
+                /* Keep working if default bdi still has things to do */
+                if (!list_empty(&me->bdi->work_list))
+                        __set_current_state(TASK_RUNNING);
+
+                switch (action) {
+                case FORK_THREAD:
+                        __set_current_state(TASK_RUNNING);
+                        task = kthread_run(bdi_writeback_thread, &bdi->wb, "flush-%s",
+                                           dev_name(bdi->dev));
+                        if (IS_ERR(task)) {
+                                /*
+                                 * If thread creation fails, force writeout of
+                                 * the bdi from the thread.
+                                 */
+                                bdi_flush_io(bdi);
+                        } else {
+                                /*
+                                 * The spinlock makes sure we do not lose
+                                 * wake-ups when racing with 'bdi_queue_work()'.
+                                 */
+                                spin_lock_bh(&bdi->wb_lock);
+                                bdi->wb.task = task;
+                                spin_unlock_bh(&bdi->wb_lock);
+                        }
+                        break;
+
+                case KILL_THREAD:
+                        __set_current_state(TASK_RUNNING);
+                        kthread_stop(task);
+                        break;
+
+                case NO_ACTION:
+                        if (!wb_has_dirty_io(me) || !dirty_writeback_interval)
+                                /*
+                                 * There are no dirty data. The only thing we
+                                 * should now care about is checking for
+                                 * inactive bdi threads and killing them. Thus,
+                                 * let's sleep for longer time, save energy and
+                                 * be friendly for battery-driven devices.
+                                 */
+                                schedule_timeout(bdi_longest_inactive());
                         else
-                                schedule();
+                                schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10));
                         try_to_freeze();
+                        /* Back to the main loop */
                         continue;
                 }
 
-                __set_current_state(TASK_RUNNING);
-
-                /*
-                 * This is our real job - check for pending entries in
-                 * bdi_pending_list, and create the tasks that got added
-                 */
-                bdi = list_entry(bdi_pending_list.next, struct backing_dev_info,
-                                 bdi_list);
-                list_del_init(&bdi->bdi_list);
-                spin_unlock_bh(&bdi_lock);
-
-                wb = &bdi->wb;
-                wb->task = kthread_run(bdi_start_fn, wb, "flush-%s",
-                                        dev_name(bdi->dev));
                 /*
-                 * If task creation fails, then readd the bdi to
-                 * the pending list and force writeout of the bdi
-                 * from this forker thread. That will free some memory
-                 * and we can try again.
+                 * Clear pending bit and wakeup anybody waiting to tear us down.
                  */
-                if (IS_ERR(wb->task)) {
-                        wb->task = NULL;
-
-                        /*
-                         * Add this 'bdi' to the back, so we get
-                         * a chance to flush other bdi's to free
-                         * memory.
-                         */
-                        spin_lock_bh(&bdi_lock);
-                        list_add_tail(&bdi->bdi_list, &bdi_pending_list);
-                        spin_unlock_bh(&bdi_lock);
-
-                        bdi_flush_io(bdi);
-                }
+                clear_bit(BDI_pending, &bdi->state);
+                smp_mb__after_clear_bit();
+                wake_up_bit(&bdi->state, BDI_pending);
         }
 
         return 0;
 }
 
-static void bdi_add_to_pending(struct rcu_head *head)
-{
-        struct backing_dev_info *bdi;
-
-        bdi = container_of(head, struct backing_dev_info, rcu_head);
-        INIT_LIST_HEAD(&bdi->bdi_list);
-
-        spin_lock(&bdi_lock);
-        list_add_tail(&bdi->bdi_list, &bdi_pending_list);
-        spin_unlock(&bdi_lock);
-
-        /*
-         * We are now on the pending list, wake up bdi_forker_task()
-         * to finish the job and add us back to the active bdi_list
-         */
-        wake_up_process(default_backing_dev_info.wb.task);
-}
-
-/*
- * Add the default flusher task that gets created for any bdi
- * that has dirty data pending writeout
- */
-void static bdi_add_default_flusher_task(struct backing_dev_info *bdi)
-{
-        if (!bdi_cap_writeback_dirty(bdi))
-                return;
-
-        if (WARN_ON(!test_bit(BDI_registered, &bdi->state))) {
-                printk(KERN_ERR "bdi %p/%s is not registered!\n",
-                                                        bdi, bdi->name);
-                return;
-        }
-
-        /*
-         * Check with the helper whether to proceed adding a task. Will only
-         * abort if we two or more simultanous calls to
-         * bdi_add_default_flusher_task() occured, further additions will block
-         * waiting for previous additions to finish.
-         */
-        if (!test_and_set_bit(BDI_pending, &bdi->state)) {
-                list_del_rcu(&bdi->bdi_list);
-
-                /*
-                 * We must wait for the current RCU period to end before
-                 * moving to the pending list. So schedule that operation
-                 * from an RCU callback.
-                 */
-                call_rcu(&bdi->rcu_head, bdi_add_to_pending);
-        }
-}
-
 /*
  * Remove bdi from bdi_list, and ensure that it is no longer visible
  */
@@ -541,23 +512,16 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
                 const char *fmt, ...)
 {
         va_list args;
-        int ret = 0;
         struct device *dev;
 
         if (bdi->dev)   /* The driver needs to use separate queues per device */
-                goto exit;
+                return 0;
 
         va_start(args, fmt);
         dev = device_create_vargs(bdi_class, parent, MKDEV(0, 0), bdi, fmt, args);
         va_end(args);
-        if (IS_ERR(dev)) {
-                ret = PTR_ERR(dev);
-                goto exit;
-        }
-
-        spin_lock_bh(&bdi_lock);
-        list_add_tail_rcu(&bdi->bdi_list, &bdi_list);
-        spin_unlock_bh(&bdi_lock);
+        if (IS_ERR(dev))
+                return PTR_ERR(dev);
 
         bdi->dev = dev;
 
@@ -569,21 +533,21 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
         if (bdi_cap_flush_forker(bdi)) {
                 struct bdi_writeback *wb = &bdi->wb;
 
-                wb->task = kthread_run(bdi_forker_task, wb, "bdi-%s",
+                wb->task = kthread_run(bdi_forker_thread, wb, "bdi-%s",
                                                 dev_name(dev));
-                if (IS_ERR(wb->task)) {
-                        wb->task = NULL;
-                        ret = -ENOMEM;
-
-                        bdi_remove_from_list(bdi);
-                        goto exit;
-                }
+                if (IS_ERR(wb->task))
+                        return PTR_ERR(wb->task);
         }
 
         bdi_debug_register(bdi, dev_name(dev));
         set_bit(BDI_registered, &bdi->state);
-exit:
-        return ret;
+
+        spin_lock_bh(&bdi_lock);
+        list_add_tail_rcu(&bdi->bdi_list, &bdi_list);
+        spin_unlock_bh(&bdi_lock);
+
+        trace_writeback_bdi_register(bdi);
+        return 0;
 }
 EXPORT_SYMBOL(bdi_register);
 
@@ -598,31 +562,29 @@ EXPORT_SYMBOL(bdi_register_dev);
  */
 static void bdi_wb_shutdown(struct backing_dev_info *bdi)
 {
-        struct bdi_writeback *wb;
-
         if (!bdi_cap_writeback_dirty(bdi))
                 return;
 
         /*
-         * If setup is pending, wait for that to complete first
+         * Make sure nobody finds us on the bdi_list anymore
          */
-        wait_on_bit(&bdi->state, BDI_pending, bdi_sched_wait,
-                        TASK_UNINTERRUPTIBLE);
+        bdi_remove_from_list(bdi);
 
         /*
-         * Make sure nobody finds us on the bdi_list anymore
+         * If setup is pending, wait for that to complete first
          */
-        bdi_remove_from_list(bdi);
+        wait_on_bit(&bdi->state, BDI_pending, bdi_sched_wait,
+                        TASK_UNINTERRUPTIBLE);
 
         /*
-         * Finally, kill the kernel threads. We don't need to be RCU
+         * Finally, kill the kernel thread. We don't need to be RCU
          * safe anymore, since the bdi is gone from visibility. Force
          * unfreeze of the thread before calling kthread_stop(), otherwise
          * it would never exet if it is currently stuck in the refrigerator.
          */
-        list_for_each_entry(wb, &bdi->wb_list, list) {
-                thaw_process(wb->task);
-                kthread_stop(wb->task);
+        if (bdi->wb.task) {
+                thaw_process(bdi->wb.task);
+                kthread_stop(bdi->wb.task);
         }
 }
 
@@ -644,7 +606,9 @@ static void bdi_prune_sb(struct backing_dev_info *bdi)
 void bdi_unregister(struct backing_dev_info *bdi)
 {
         if (bdi->dev) {
+                trace_writeback_bdi_unregister(bdi);
                 bdi_prune_sb(bdi);
+                del_timer_sync(&bdi->wb.wakeup_timer);
 
                 if (!bdi_cap_flush_forker(bdi))
                         bdi_wb_shutdown(bdi);
@@ -655,6 +619,18 @@ void bdi_unregister(struct backing_dev_info *bdi)
 }
 EXPORT_SYMBOL(bdi_unregister);
 
+static void bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
+{
+        memset(wb, 0, sizeof(*wb));
+
+        wb->bdi = bdi;
+        wb->last_old_flush = jiffies;
+        INIT_LIST_HEAD(&wb->b_dirty);
+        INIT_LIST_HEAD(&wb->b_io);
+        INIT_LIST_HEAD(&wb->b_more_io);
+        setup_timer(&wb->wakeup_timer, wakeup_timer_fn, (unsigned long)bdi);
+}
+
 int bdi_init(struct backing_dev_info *bdi)
 {
         int i, err;
@@ -666,7 +642,6 @@ int bdi_init(struct backing_dev_info *bdi)
         bdi->max_prop_frac = PROP_FRAC_BASE;
         spin_lock_init(&bdi->wb_lock);
         INIT_LIST_HEAD(&bdi->bdi_list);
-        INIT_LIST_HEAD(&bdi->wb_list);
         INIT_LIST_HEAD(&bdi->work_list);
 
         bdi_wb_init(&bdi->wb, bdi);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index df8202ebc7b8..0c6258bd1ba3 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -34,6 +34,7 @@
 #include <linux/syscalls.h>
 #include <linux/buffer_head.h>
 #include <linux/pagevec.h>
+#include <trace/events/writeback.h>
 
 /*
  * After a CPU has dirtied this many pages, balance_dirty_pages_ratelimited
@@ -535,11 +536,13 @@ static void balance_dirty_pages(struct address_space *mapping,
                  * threshold otherwise wait until the disk writes catch
                  * up.
                  */
+                trace_wbc_balance_dirty_start(&wbc, bdi);
                 if (bdi_nr_reclaimable > bdi_thresh) {
                         writeback_inodes_wb(&bdi->wb, &wbc);
                         pages_written += write_chunk - wbc.nr_to_write;
                         get_dirty_limits(&background_thresh, &dirty_thresh,
                                        &bdi_thresh, bdi);
+                        trace_wbc_balance_dirty_written(&wbc, bdi);
                 }
 
                 /*
@@ -565,6 +568,7 @@ static void balance_dirty_pages(struct address_space *mapping,
                 if (pages_written >= write_chunk)
                         break;          /* We've done our duty */
 
+                trace_wbc_balance_dirty_wait(&wbc, bdi);
                 __set_current_state(TASK_INTERRUPTIBLE);
                 io_schedule_timeout(pause);
 
@@ -962,6 +966,7 @@ continue_unlock:
                         if (!clear_page_dirty_for_io(page))
                                 goto continue_unlock;
 
+                        trace_wbc_writepage(wbc, mapping->backing_dev_info);
                         ret = (*writepage)(page, wbc, data);
                         if (unlikely(ret)) {
                                 if (ret == AOP_WRITEPAGE_ACTIVATE) {
diff --git a/mm/page_io.c b/mm/page_io.c
index 31a3b962230a..2dee975bf469 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -106,7 +106,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
                 goto out;
         }
         if (wbc->sync_mode == WB_SYNC_ALL)
-                rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+                rw |= REQ_SYNC | REQ_UNPLUG;
         count_vm_event(PSWPOUT);
         set_page_writeback(page);
         unlock_page(page);