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authorJoe Thornber <ejt@redhat.com>2021-04-13 09:11:53 +0100
committerMike Snitzer <snitzer@redhat.com>2021-04-19 12:48:13 -0400
commit5208692e80a1f3c8ce2063a22b675dd5589d1d80 (patch)
tree62b5b0f708c857cc278e8e4ce47f7ae5b126329f /drivers/md
parenta88b2358f1da2c9f9fcc432f2e0a79617fea397c (diff)
downloadlinux-5208692e80a1f3c8ce2063a22b675dd5589d1d80.tar.bz2
dm space map common: fix division bug in sm_ll_find_free_block()
This division bug meant the search for free metadata space could skip the final allocation bitmap's worth of entries. Fix affects DM thinp, cache and era targets. Cc: stable@vger.kernel.org Signed-off-by: Joe Thornber <ejt@redhat.com> Tested-by: Ming-Hung Tsai <mtsai@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/persistent-data/dm-space-map-common.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/persistent-data/dm-space-map-common.c b/drivers/md/persistent-data/dm-space-map-common.c
index d8b4125e338c..a213bf11738f 100644
--- a/drivers/md/persistent-data/dm-space-map-common.c
+++ b/drivers/md/persistent-data/dm-space-map-common.c
@@ -339,6 +339,8 @@ int sm_ll_find_free_block(struct ll_disk *ll, dm_block_t begin,
*/
begin = do_div(index_begin, ll->entries_per_block);
end = do_div(end, ll->entries_per_block);
+ if (end == 0)
+ end = ll->entries_per_block;
for (i = index_begin; i < index_end; i++, begin = 0) {
struct dm_block *blk;