Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block

* 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block: (153 commits)
  block: add request clone interface (v2)
  floppy: fix hibernation
  ramdisk: remove long-deprecated "ramdisk=" boot-time parameter
  fs/bio.c: add missing __user annotation
  block: prevent possible io_context->refcount overflow
  Add serial number support for virtio_blk, V4a
  block: Add missing bounce_pfn stacking and fix comments
  Revert "block: Fix bounce limit setting in DM"
  cciss: decode unit attention in SCSI error handling code
  cciss: Remove no longer needed sendcmd reject processing code
  cciss: change SCSI error handling routines to work with interrupts enabled.
  cciss: separate error processing and command retrying code in sendcmd_withirq_core()
  cciss: factor out fix target status processing code from sendcmd functions
  cciss: simplify interface of sendcmd() and sendcmd_withirq()
  cciss: factor out core of sendcmd_withirq() for use by SCSI error handling code
  cciss: Use schedule_timeout_uninterruptible in SCSI error handling code
  block: needs to set the residual length of a bidi request
  Revert "block: implement blkdev_readpages"
  block: Fix bounce limit setting in DM
  Removed reference to non-existing file Documentation/PCI/PCI-DMA-mapping.txt
  ...

Manually fix conflicts with tracing updates in:
	block/blk-sysfs.c
	drivers/ide/ide-atapi.c
	drivers/ide/ide-cd.c
	drivers/ide/ide-floppy.c
	drivers/ide/ide-tape.c
	include/trace/events/block.h
	kernel/trace/blktrace.c

1 files changed, 22 insertions, 49 deletions

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 23d2a6fe34a3..39ce64432ba6 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -9,35 +9,6 @@
 
 #include "blk.h"
 
-void blk_recalc_rq_sectors(struct request *rq, int nsect)
-{
-        if (blk_fs_request(rq) || blk_discard_rq(rq)) {
-                rq->hard_sector += nsect;
-                rq->hard_nr_sectors -= nsect;
-
-                /*
-                 * Move the I/O submission pointers ahead if required.
-                 */
-                if ((rq->nr_sectors >= rq->hard_nr_sectors) &&
-                    (rq->sector <= rq->hard_sector)) {
-                        rq->sector = rq->hard_sector;
-                        rq->nr_sectors = rq->hard_nr_sectors;
-                        rq->hard_cur_sectors = bio_cur_sectors(rq->bio);
-                        rq->current_nr_sectors = rq->hard_cur_sectors;
-                        rq->buffer = bio_data(rq->bio);
-                }
-
-                /*
-                 * if total number of sectors is less than the first segment
-                 * size, something has gone terribly wrong
-                 */
-                if (rq->nr_sectors < rq->current_nr_sectors) {
-                        printk(KERN_ERR "blk: request botched\n");
-                        rq->nr_sectors = rq->current_nr_sectors;
-                }
-        }
-}
-
 static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
                                              struct bio *bio)
 {
@@ -61,11 +32,12 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
                          * never considered part of another segment, since that
                          * might change with the bounce page.
                          */
-                        high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
+                        high = page_to_pfn(bv->bv_page) > queue_bounce_pfn(q);
                         if (high || highprv)
                                 goto new_segment;
                         if (cluster) {
-                                if (seg_size + bv->bv_len > q->max_segment_size)
+                                if (seg_size + bv->bv_len
+                                    > queue_max_segment_size(q))
                                         goto new_segment;
                                 if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))
                                         goto new_segment;
@@ -120,7 +92,7 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
                 return 0;
 
         if (bio->bi_seg_back_size + nxt->bi_seg_front_size >
-            q->max_segment_size)
+            queue_max_segment_size(q))
                 return 0;
 
         if (!bio_has_data(bio))
@@ -163,7 +135,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
                 int nbytes = bvec->bv_len;
 
                 if (bvprv && cluster) {
-                        if (sg->length + nbytes > q->max_segment_size)
+                        if (sg->length + nbytes > queue_max_segment_size(q))
                                 goto new_segment;
 
                         if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))
@@ -199,8 +171,9 @@ new_segment:
 
 
         if (unlikely(rq->cmd_flags & REQ_COPY_USER) &&
-            (rq->data_len & q->dma_pad_mask)) {
-                unsigned int pad_len = (q->dma_pad_mask & ~rq->data_len) + 1;
+            (blk_rq_bytes(rq) & q->dma_pad_mask)) {
+                unsigned int pad_len =
+                        (q->dma_pad_mask & ~blk_rq_bytes(rq)) + 1;
 
                 sg->length += pad_len;
                 rq->extra_len += pad_len;
@@ -233,8 +206,8 @@ static inline int ll_new_hw_segment(struct request_queue *q,
 {
         int nr_phys_segs = bio_phys_segments(q, bio);
 
-        if (req->nr_phys_segments + nr_phys_segs > q->max_hw_segments
-            || req->nr_phys_segments + nr_phys_segs > q->max_phys_segments) {
+        if (req->nr_phys_segments + nr_phys_segs > queue_max_hw_segments(q) ||
+            req->nr_phys_segments + nr_phys_segs > queue_max_phys_segments(q)) {
                 req->cmd_flags |= REQ_NOMERGE;
                 if (req == q->last_merge)
                         q->last_merge = NULL;
@@ -255,11 +228,11 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
         unsigned short max_sectors;
 
         if (unlikely(blk_pc_request(req)))
-                max_sectors = q->max_hw_sectors;
+                max_sectors = queue_max_hw_sectors(q);
         else
-                max_sectors = q->max_sectors;
+                max_sectors = queue_max_sectors(q);
 
-        if (req->nr_sectors + bio_sectors(bio) > max_sectors) {
+        if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
                 req->cmd_flags |= REQ_NOMERGE;
                 if (req == q->last_merge)
                         q->last_merge = NULL;
@@ -279,12 +252,12 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
         unsigned short max_sectors;
 
         if (unlikely(blk_pc_request(req)))
-                max_sectors = q->max_hw_sectors;
+                max_sectors = queue_max_hw_sectors(q);
         else
-                max_sectors = q->max_sectors;
+                max_sectors = queue_max_sectors(q);
 
 
-        if (req->nr_sectors + bio_sectors(bio) > max_sectors) {
+        if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
                 req->cmd_flags |= REQ_NOMERGE;
                 if (req == q->last_merge)
                         q->last_merge = NULL;
@@ -315,7 +288,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
         /*
          * Will it become too large?
          */
-        if ((req->nr_sectors + next->nr_sectors) > q->max_sectors)
+        if ((blk_rq_sectors(req) + blk_rq_sectors(next)) > queue_max_sectors(q))
                 return 0;
 
         total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;
@@ -327,10 +300,10 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
                 total_phys_segments--;
         }
 
-        if (total_phys_segments > q->max_phys_segments)
+        if (total_phys_segments > queue_max_phys_segments(q))
                 return 0;
 
-        if (total_phys_segments > q->max_hw_segments)
+        if (total_phys_segments > queue_max_hw_segments(q))
                 return 0;
 
         /* Merge is OK... */
@@ -345,7 +318,7 @@ static void blk_account_io_merge(struct request *req)
                 int cpu;
 
                 cpu = part_stat_lock();
-                part = disk_map_sector_rcu(req->rq_disk, req->sector);
+                part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
 
                 part_round_stats(cpu, part);
                 part_dec_in_flight(part);
@@ -366,7 +339,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
         /*
          * not contiguous
          */
-        if (req->sector + req->nr_sectors != next->sector)
+        if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
                 return 0;
 
         if (rq_data_dir(req) != rq_data_dir(next)
@@ -398,7 +371,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
         req->biotail->bi_next = next->bio;
         req->biotail = next->biotail;
 
-        req->nr_sectors = req->hard_nr_sectors += next->hard_nr_sectors;
+        req->__data_len += blk_rq_bytes(next);
 
         elv_merge_requests(q, req, next);