Merge branch 'for-2.6.28' of git://git.kernel.dk/linux-2.6-block

* 'for-2.6.28' of git://git.kernel.dk/linux-2.6-block: (132 commits)
  doc/cdrom: Trvial documentation error, file not present
  block_dev: fix kernel-doc in new functions
  block: add some comments around the bio read-write flags
  block: mark bio_split_pool static
  block: Find bio sector offset given idx and offset
  block: gendisk integrity wrapper
  block: Switch blk_integrity_compare from bdev to gendisk
  block: Fix double put in blk_integrity_unregister
  block: Introduce integrity data ownership flag
  block: revert part of d7533ad0e132f92e75c1b2eb7c26387b25a583c1
  bio.h: Remove unused conditional code
  block: remove end_{queued|dequeued}_request()
  block: change elevator to use __blk_end_request()
  gdrom: change to use __blk_end_request()
  memstick: change to use __blk_end_request()
  virtio_blk: change to use __blk_end_request()
  blktrace: use BLKTRACE_BDEV_SIZE as the name size for setup structure
  block: add lld busy state exporting interface
  block: Fix blk_start_queueing() to not kick a stopped queue
  include blktrace_api.h in headers_install
  ...

1 files changed, 94 insertions, 57 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 53ea933cf60..a92d9e4ea96 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -16,7 +16,9 @@
 #include <linux/bio.h>
 #include <linux/module.h>
 #include <linux/stringify.h>
+#include <linux/gfp.h>
 #include <linux/bsg.h>
+#include <linux/smp.h>
 
 #include <asm/scatterlist.h>
 
@@ -54,7 +56,6 @@ enum rq_cmd_type_bits {
         REQ_TYPE_PM_SUSPEND,            /* suspend request */
         REQ_TYPE_PM_RESUME,             /* resume request */
         REQ_TYPE_PM_SHUTDOWN,           /* shutdown request */
-        REQ_TYPE_FLUSH,                 /* flush request */
         REQ_TYPE_SPECIAL,               /* driver defined type */
         REQ_TYPE_LINUX_BLOCK,           /* generic block layer message */
         /*
@@ -76,19 +77,18 @@ enum rq_cmd_type_bits {
  *
  */
 enum {
-        /*
-         * just examples for now
-         */
         REQ_LB_OP_EJECT = 0x40,         /* eject request */
-        REQ_LB_OP_FLUSH = 0x41,         /* flush device */
+        REQ_LB_OP_FLUSH = 0x41,         /* flush request */
+        REQ_LB_OP_DISCARD = 0x42,       /* discard sectors */
 };
 
 /*
- * request type modified bits. first three bits match BIO_RW* bits, important
+ * request type modified bits. first two bits match BIO_RW* bits, important
  */
 enum rq_flag_bits {
         __REQ_RW,               /* not set, read. set, write */
         __REQ_FAILFAST,         /* no low level driver retries */
+        __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 */
@@ -111,6 +111,7 @@ enum rq_flag_bits {
 };
 
 #define REQ_RW          (1 << __REQ_RW)
+#define REQ_DISCARD     (1 << __REQ_DISCARD)
 #define REQ_FAILFAST    (1 << __REQ_FAILFAST)
 #define REQ_SORTED      (1 << __REQ_SORTED)
 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
@@ -140,12 +141,14 @@ enum rq_flag_bits {
  */
 struct request {
         struct list_head queuelist;
-        struct list_head donelist;
+        struct call_single_data csd;
+        int cpu;
 
         struct request_queue *q;
 
         unsigned int cmd_flags;
         enum rq_cmd_type_bits cmd_type;
+        unsigned long atomic_flags;
 
         /* Maintain bio traversal state for part by part I/O submission.
          * hard_* are block layer internals, no driver should touch them!
@@ -190,13 +193,6 @@ struct request {
          */
         unsigned short nr_phys_segments;
 
-        /* Number of scatter-gather addr+len pairs after
-         * physical and DMA remapping hardware coalescing is performed.
-         * This is the number of scatter-gather entries the driver
-         * will actually have to deal with after DMA mapping is done.
-         */
-        unsigned short nr_hw_segments;
-
         unsigned short ioprio;
 
         void *special;
@@ -220,6 +216,8 @@ struct request {
         void *data;
         void *sense;
 
+        unsigned long deadline;
+        struct list_head timeout_list;
         unsigned int timeout;
         int retries;
 
@@ -233,6 +231,11 @@ struct request {
         struct request *next_rq;
 };
 
+static inline unsigned short req_get_ioprio(struct request *req)
+{
+        return req->ioprio;
+}
+
 /*
  * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
  * requests. Some step values could eventually be made generic.
@@ -252,6 +255,7 @@ 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 (unplug_fn) (struct request_queue *);
+typedef int (prepare_discard_fn) (struct request_queue *, struct request *);
 
 struct bio_vec;
 struct bvec_merge_data {
@@ -265,6 +269,15 @@ typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
 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);
+
+enum blk_eh_timer_return {
+        BLK_EH_NOT_HANDLED,
+        BLK_EH_HANDLED,
+        BLK_EH_RESET_TIMER,
+};
+
+typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
 
 enum blk_queue_state {
         Queue_down,
@@ -307,10 +320,13 @@ struct request_queue
         make_request_fn         *make_request_fn;
         prep_rq_fn              *prep_rq_fn;
         unplug_fn               *unplug_fn;
+        prepare_discard_fn      *prepare_discard_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;
+        lld_busy_fn             *lld_busy_fn;
 
         /*
          * Dispatch queue sorting
@@ -385,6 +401,10 @@ struct request_queue
         unsigned int            nr_sorted;
         unsigned int            in_flight;
 
+        unsigned int            rq_timeout;
+        struct timer_list       timeout;
+        struct list_head        timeout_list;
+
         /*
          * sg stuff
          */
@@ -421,6 +441,10 @@ struct request_queue
 #define QUEUE_FLAG_ELVSWITCH    8       /* don't use elevator, just do FIFO */
 #define QUEUE_FLAG_BIDI         9       /* queue supports bidi requests */
 #define QUEUE_FLAG_NOMERGES    10       /* disable merge attempts */
+#define QUEUE_FLAG_SAME_COMP   11       /* force complete on same CPU */
+#define QUEUE_FLAG_FAIL_IO     12       /* fake timeout */
+#define QUEUE_FLAG_STACKABLE   13       /* supports request stacking */
+#define QUEUE_FLAG_NONROT      14       /* non-rotational device (SSD) */
 
 static inline int queue_is_locked(struct request_queue *q)
 {
@@ -526,7 +550,10 @@ enum {
 #define blk_queue_tagged(q)     test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)