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, 4 insertions, 2 deletions

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index fb05f6a4bbfd..8c5504c0e894 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -115,7 +115,8 @@ static void build_data_key(struct dm_thin_device *td,
 {
         key->virtual = 0;
         key->dev = dm_thin_dev_id(td);
-        key->block = b;
+        key->block_begin = b;
+        key->block_end = b + 1ULL;
 }
 
 static void build_virtual_key(struct dm_thin_device *td, dm_block_t b,
@@ -123,7 +124,8 @@ static void build_virtual_key(struct dm_thin_device *td, dm_block_t b,
 {
         key->virtual = 1;
         key->dev = dm_thin_dev_id(td);
-        key->block = b;
+        key->block_begin = b;
+        key->block_end = b + 1ULL;
 }
 
 /*----------------------------------------------------------------*/