dm bio prison: introduce support for locking ranges of blocks

Ranges will be placed in the same cell if they overlap.

Range locking is a prerequisite for more efficient multi-block discard
support in both the cache and thin-provisioning targets.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 69de8b43ca12..890e2fff4074 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -436,7 +436,8 @@ static void build_key(dm_oblock_t oblock, struct dm_cell_key *key)
 {
         key->virtual = 0;
         key->dev = 0;
-        key->block = from_oblock(oblock);
+        key->block_begin = from_oblock(oblock);
+        key->block_end = key->block_begin + 1ULL;
 }
 
 /*