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dm thin metadata: fix a race when entering fail mode

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In dm_thin_find_block() the ->fail_io flag was checked outside the
metadata device's root_lock, causing dm_thin_find_block() to race with
the setting of this flag.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2015-06-11 17:11:48 +01:00 committed by Mike Snitzer
parent fd467696e8
commit b1f11aff04
1 changed files with 4 additions and 3 deletions
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7
drivers/md/dm-thin-metadata.c
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@ -1390,10 +1390,11 @@ int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
dm_block_t keys[2] = { td->id, block };
struct dm_btree_info *info;
if (pmd->fail_io)
return -EINVAL;
down_read(&pmd->root_lock);
if (pmd->fail_io) {
up_read(&pmd->root_lock);
return -EINVAL;
}
if (can_issue_io) {
info = &pmd->info;