dm: linear add merge

This patch implements biovec merge function for linear target.

If the underlying device has merge function defined, call it.
If not, keep precomputed value.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 33 insertions, 5 deletions

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 17753d80ad22..6449bcdf84ca 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -69,13 +69,25 @@ static void linear_dtr(struct dm_target *ti)
         kfree(lc);
 }
 
-static int linear_map(struct dm_target *ti, struct bio *bio,
-                      union map_info *map_context)
+static sector_t linear_map_sector(struct dm_target *ti, sector_t bi_sector)
 {
-        struct linear_c *lc = (struct linear_c *) ti->private;
+        struct linear_c *lc = ti->private;
+
+        return lc->start + (bi_sector - ti->begin);
+}
+
+static void linear_map_bio(struct dm_target *ti, struct bio *bio)
+{
+        struct linear_c *lc = ti->private;
 
         bio->bi_bdev = lc->dev->bdev;
-        bio->bi_sector = lc->start + (bio->bi_sector - ti->begin);
+        bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
+}
+
+static int linear_map(struct dm_target *ti, struct bio *bio,
+                      union map_info *map_context)
+{
+        linear_map_bio(ti, bio);
 
         return DM_MAPIO_REMAPPED;
 }
@@ -114,15 +126,31 @@ static int linear_ioctl(struct dm_target *ti, struct inode *inode,
         return blkdev_driver_ioctl(bdev->bd_inode, &fake_file, bdev->bd_disk, cmd, arg);
 }
 
+static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+                        struct bio_vec *biovec, int max_size)
+{
+        struct linear_c *lc = ti->private;
+        struct request_queue *q = bdev_get_queue(lc->dev->bdev);
+
+        if (!q->merge_bvec_fn)
+                return max_size;
+
+        bvm->bi_bdev = lc->dev->bdev;
+        bvm->bi_sector = linear_map_sector(ti, bvm->bi_sector);
+
+        return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
+}
+
 static struct target_type linear_target = {
         .name   = "linear",
-        .version= {1, 0, 2},
+        .version= {1, 0, 3},
         .module = THIS_MODULE,
         .ctr    = linear_ctr,
         .dtr    = linear_dtr,
         .map    = linear_map,
         .status = linear_status,
         .ioctl  = linear_ioctl,
+        .merge  = linear_merge,
 };
 
 int __init dm_linear_init(void)