[PATCH] Btrfs: add missing extents release on file extent cluster relocation error

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

If we error out when finding a page at relocate_file_extent_cluster(), we
need to release the outstanding extents counter on the relocation inode,
set by the previous call to btrfs_delalloc_reserve_metadata(), otherwise
the inode's block reserve size can never decrease to zero and metadata
space is leaked. Therefore add a call to btrfs_delalloc_release_extents()
in case we can't find the target page.

Fixes: 8b62f87bad9cf0 ("Btrfs: rework outstanding_extents")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/relocation.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 00504657b602..88dbc0127793 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3277,6 +3277,8 @@ static int relocate_file_extent_cluster(struct inode *inode,
 			if (!page) {
 				btrfs_delalloc_release_metadata(BTRFS_I(inode),
 							PAGE_SIZE, true);
+				btrfs_delalloc_release_extents(BTRFS_I(inode),
+							       PAGE_SIZE, true);
 				ret = -ENOMEM;
 				goto out;
 			}
-- 
2.11.0