[PATCH 3.16 091/366] Btrfs: reserve space for O_TMPFILE orphan item deletion

Ben Hutchings
2018-11-11T20:05:49Z

From: Omar Sandoval <osandov@fb.com>

commit 399b0bbf5f680797d3599fa14f16706ffc470145 upstream.

btrfs_link() calls btrfs_orphan_del() if it's linking an O_TMPFILE but
it doesn't reserve space to do so. Even before the removal of the
orphan_block_rsv it wasn't using it.

Fixes: ef3b9af50bfa ("Btrfs: implement inode_operations callback tmpfile")
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/btrfs/inode.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6142,8 +6142,9 @@ static int btrfs_link(struct dentry *old
* 2 items for inode and inode ref
* 2 items for dir items
* 1 item for parent inode
+ * 1 item for orphan item deletion if O_TMPFILE
*/
- trans = btrfs_start_transaction(root, 5);
+ trans = btrfs_start_transaction(root, inode->i_nlink ? 5 : 6);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto fail;