7 files changed, 60 insertions, 29 deletions

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 3ba1df93e9e3..589850cff359 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2633,11 +2633,12 @@ end_io:
 
 
 
-static int pkt_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec)
+static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
+                          struct bio_vec *bvec)
 {
         struct pktcdvd_device *pd = q->queuedata;
-        sector_t zone = ZONE(bio->bi_sector, pd);
-        int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
+        sector_t zone = ZONE(bmd->bi_sector, pd);
+        int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size;
         int remaining = (pd->settings.size << 9) - used;
         int remaining2;
 
@@ -2645,7 +2646,7 @@ static int pkt_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_v
          * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
          * boundary, pkt_make_request() will split the bio.
          */
-        remaining2 = PAGE_SIZE - bio->bi_size;
+        remaining2 = PAGE_SIZE - bmd->bi_size;
         remaining = max(remaining, remaining2);
 
         BUG_ON(remaining < 0);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 10748240cb2f..6a866d7c8ae5 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -50,17 +50,19 @@ static inline dev_info_t *which_dev(mddev_t *mddev, sector_t sector)
 /**
  *      linear_mergeable_bvec -- tell bio layer if two requests can be merged
  *      @q: request queue
- *      @bio: the buffer head that's been built up so far
+ *      @bvm: properties of new bio
  *      @biovec: the request that could be merged to it.
  *
  *      Return amount of bytes we can take at this offset
  */
-static int linear_mergeable_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *biovec)
+static int linear_mergeable_bvec(struct request_queue *q,
+                                 struct bvec_merge_data *bvm,
+                                 struct bio_vec *biovec)
 {
         mddev_t *mddev = q->queuedata;
         dev_info_t *dev0;
-        unsigned long maxsectors, bio_sectors = bio->bi_size >> 9;
-        sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev);
+        unsigned long maxsectors, bio_sectors = bvm->bi_size >> 9;
+        sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
 
         dev0 = which_dev(mddev, sector);
         maxsectors = (dev0->size << 1) - (sector - (dev0->offset<<1));
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 914c04ddec7c..bcbb82594a19 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -241,18 +241,20 @@ static int create_strip_zones (mddev_t *mddev)
 /**
  *      raid0_mergeable_bvec -- tell bio layer if a two requests can be merged
  *      @q: request queue
- *      @bio: the buffer head that's been built up so far
+ *      @bvm: properties of new bio
  *      @biovec: the request that could be merged to it.
  *
  *      Return amount of bytes we can accept at this offset
  */
-static int raid0_mergeable_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *biovec)
+static int raid0_mergeable_bvec(struct request_queue *q,
+                                struct bvec_merge_data *bvm,
+                                struct bio_vec *biovec)
 {
         mddev_t *mddev = q->queuedata;
-        sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev);
+        sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
         int max;
         unsigned int chunk_sectors = mddev->chunk_size >> 9;
-        unsigned int bio_sectors = bio->bi_size >> 9;
+        unsigned int bio_sectors = bvm->bi_size >> 9;
 
         max =  (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
         if (max < 0) max = 0; /* bio_add cannot handle a negative return */
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index a71277b640ab..22bb2b1b886d 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -439,26 +439,27 @@ static sector_t raid10_find_virt(conf_t *conf, sector_t sector, int dev)
 /**
  *      raid10_mergeable_bvec -- tell bio layer if a two requests can be merged
  *      @q: request queue
- *      @bio: the buffer head that's been built up so far
+ *      @bvm: properties of new bio
  *      @biovec: the request that could be merged to it.
  *
  *      Return amount of bytes we can accept at this offset
  *      If near_copies == raid_disk, there are no striping issues,
  *      but in that case, the function isn't called at all.
  */
-static int raid10_mergeable_bvec(struct request_queue *q, struct bio *bio,
-                                struct bio_vec *bio_vec)
+static int raid10_mergeable_bvec(struct request_queue *q,
+                                 struct bvec_merge_data *bvm,
+                                 struct bio_vec *biovec)
 {
         mddev_t *mddev = q->queuedata;
-        sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev);
+        sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
         int max;
         unsigned int chunk_sectors = mddev->chunk_size >> 9;
-        unsigned int bio_sectors = bio->bi_size >> 9;
+        unsigned int bio_sectors = bvm->bi_size >> 9;
 
         max =  (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
         if (max < 0) max = 0; /* bio_add cannot handle a negative return */
-        if (max <= bio_vec->bv_len && bio_sectors == 0)
-                return bio_vec->bv_len;
+        if (max <= biovec->bv_len && bio_sectors == 0)
+                return biovec->bv_len;
         else
                 return max;
 }
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 54c8ee28fcc4..9b00675dc64f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3319,15 +3319,17 @@ static int raid5_congested(void *data, int bits)
 /* We want read requests to align with chunks where possible,
  * but write requests don't need to.
  */
-static int raid5_mergeable_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *biovec)
+static int raid5_mergeable_bvec(struct request_queue *q,
+                                struct bvec_merge_data *bvm,
+                                struct bio_vec *biovec)
 {
         mddev_t *mddev = q->queuedata;
-        sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev);
+        sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
         int max;
         unsigned int chunk_sectors = mddev->chunk_size >> 9;
-        unsigned int bio_sectors = bio->bi_size >> 9;
+        unsigned int bio_sectors = bvm->bi_size >> 9;
 
-        if (bio_data_dir(bio) == WRITE)
+        if ((bvm->bi_rw & 1) == WRITE)
                 return biovec->bv_len; /* always allow writes to be mergeable */
 
         max =  (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
diff --git a/fs/bio.c b/fs/bio.c
index 7761c84c7032..88322b066acb 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -325,10 +325,19 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
                 if (page == prev->bv_page &&
                     offset == prev->bv_offset + prev->bv_len) {
                         prev->bv_len += len;
-                        if (q->merge_bvec_fn &&
-                            q->merge_bvec_fn(q, bio, prev) < len) {
-                                prev->bv_len -= len;
-                                return 0;
+
+                        if (q->merge_bvec_fn) {
+                                struct bvec_merge_data bvm = {
+                                        .bi_bdev = bio->bi_bdev,
+                                        .bi_sector = bio->bi_sector,
+                                        .bi_size = bio->bi_size,
+                                        .bi_rw = bio->bi_rw,
+                                };
+
+                                if (q->merge_bvec_fn(q, &bvm, prev) < len) {
+                                        prev->bv_len -= len;
+                                        return 0;
+                                }
                         }
 
                         goto done;
@@ -369,11 +378,18 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
          * queue to get further control
          */
         if (q->merge_bvec_fn) {
+                struct bvec_merge_data bvm = {
+                        .bi_bdev = bio->bi_bdev,
+                        .bi_sector = bio->bi_sector,
+                        .bi_size = bio->bi_size,
+                        .bi_rw = bio->bi_rw,
+                };
+
                 /*
                  * merge_bvec_fn() returns number of bytes it can accept
                  * at this offset
                  */
-                if (q->merge_bvec_fn(q, bio, bvec) < len) {
+                if (q->merge_bvec_fn(q, &bvm, bvec) < len) {
                         bvec->bv_page = NULL;
                         bvec->bv_len = 0;
                         bvec->bv_offset = 0;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7ab8acad5b6e..ff9d0bdf2a16 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -254,7 +254,14 @@ typedef int (prep_rq_fn) (struct request_queue *, struct request *);
 typedef void (unplug_fn) (struct request_queue *);
 
 struct bio_vec;
-typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *);
+struct bvec_merge_data {
+        struct block_device *bi_bdev;
+        sector_t bi_sector;
+        unsigned bi_size;
+        unsigned long bi_rw;
+};
+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 *);