[PATCH] Btrfs: handle quota reserve failure properly

[Josef Bacik <jbacik@fb.com>]

btrfs/022 was spitting a warning for the case that we exceed the quota.  If we
fail to make our quota reservation we need to clean up our data space
reservation.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
---
 fs/btrfs/extent-tree.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 03da2f6..d72eaae 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4286,13 +4286,10 @@ int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len)
 	if (ret < 0)
 		return ret;
 
-	/*
-	 * Use new btrfs_qgroup_reserve_data to reserve precious data space
-	 *
-	 * TODO: Find a good method to avoid reserve data space for NOCOW
-	 * range, but don't impact performance on quota disable case.
-	 */
+	/* Use new btrfs_qgroup_reserve_data to reserve precious data space. */
 	ret = btrfs_qgroup_reserve_data(inode, start, len);
+	if (ret)
+		btrfs_free_reserved_data_space_noquota(inode, start, len);
 	return ret;
 }
 
-- 
2.7.4