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authorJoe Thornber <ejt@redhat.com>2014-11-24 14:05:16 +0000
committerMike Snitzer <snitzer@redhat.com>2014-12-01 11:30:09 -0500
commit2572629a1318eb9e13e70fa59756d7bcfb80319e (patch)
tree7162438bb121f9e4c101425d36c246ce3cb5e935 /drivers/md
parent8001e87d0ee98787c46f14f5f4f97aced70f119f (diff)
dm cache: fix some issues with the new discard range support
Commit 7ae34e777 ("dm cache: improve discard support") needed to also: - discontinue having DM core split the discard bios on cache block boundaries - calculate the cache's discard_nr_blocks relative to the determined discard_block_size rather than using oblock_to_dblock() Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-cache-target.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index abdd45d07bf6..41e7cfdb450d 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2338,8 +2338,7 @@ static int cache_create(struct cache_args *ca, struct cache **result)
ti->num_discard_bios = 1;
ti->discards_supported = true;
ti->discard_zeroes_data_unsupported = true;
- /* Discard bios must be split on a block boundary */
- ti->split_discard_bios = true;
+ ti->split_discard_bios = false;
cache->features = ca->features;
ti->per_bio_data_size = get_per_bio_data_size(cache);
@@ -2440,7 +2439,8 @@ static int cache_create(struct cache_args *ca, struct cache **result)
cache->discard_block_size =
calculate_discard_block_size(cache->sectors_per_block,
cache->origin_sectors);
- cache->discard_nr_blocks = oblock_to_dblock(cache, cache->origin_blocks);
+ cache->discard_nr_blocks = to_dblock(dm_sector_div_up(cache->origin_sectors,
+ cache->discard_block_size));
cache->discard_bitset = alloc_bitset(from_dblock(cache->discard_nr_blocks));
if (!cache->discard_bitset) {
*error = "could not allocate discard bitset";

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