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authorJoe Thornber <ejt@redhat.com>2015-06-11 17:11:48 +0100
committerMike Snitzer <snitzer@redhat.com>2015-06-11 17:13:06 -0400
commitb1f11aff04cc86daa0757ada5deb669a92a8f0fb (patch)
tree53fe7654800e4e179b29fa98157fa3afa591e804 /drivers/md/dm-thin-metadata.c
parentfd467696e8beb542144cd005ff96cd35fff41354 (diff)
downloadlinux-b1f11aff04cc86daa0757ada5deb669a92a8f0fb.tar.bz2
dm thin metadata: fix a race when entering fail mode
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>
Diffstat (limited to 'drivers/md/dm-thin-metadata.c')
-rw-r--r--drivers/md/dm-thin-metadata.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 8b521e3e1e1b..48dfe3c4d6aa 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -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;