[dm-devel] [PATCH 3/3] dm thin metadata: check __commit_transaction()'s return

[Mike Snitzer]

Fix __reserve_metadata_snap() to return early if __commit_transaction()
fails.

Signed-off-by: Mike Snitzer <snitzer at redhat.com>
---
 drivers/md/dm-thin-metadata.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index f4e8327abc75..3ba27f5f7da9 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1248,7 +1248,12 @@ static int __reserve_metadata_snap(struct dm_pool_metadata *pmd)
 	 * We commit to ensure the btree roots which we increment in a
 	 * moment are up to date.
 	 */
-	__commit_transaction(pmd);
+	r = __commit_transaction(pmd);
+	if (r < 0) {
+		DMWARN("%s: __commit_transaction() failed, error = %d",
+		       __func__, r);
+		return r;
+	}
 
 	/*
 	 * Copy the superblock.
-- 
2.18.0