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dm space map common: fix division bug in sm_ll_find_free_block()

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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>
This commit is contained in:
Joe Thornber 2021-04-13 09:11:53 +01:00 committed by Mike Snitzer
parent a88b2358f1
commit 5208692e80
1 changed files with 2 additions and 0 deletions
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2
drivers/md/persistent-data/dm-space-map-common.c
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@ -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;