[PATCH 4.14 134/167] Btrfs: fix deadlock in run_delalloc_nocow

Greg Kroah-Hartman
2018-02-21T12:49:05Z

From: Liu Bo <bo.li.liu@oracle.com>

commit e89166990f11c3f21e1649d760dd35f9e410321c upstream.

@cur_offset is not set back to what it should be (@cow_start) if
btrfs_next_leaf() returns something wrong, and the range [cow_start,
cur_offset) remains locked forever.

cc: <stable@vger.kernel.org>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/btrfs/inode.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1330,8 +1330,11 @@ next_slot:
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
- if (ret < 0)
+ if (ret < 0) {
+ if (cow_start != (u64)-1)
+ cur_offset = cow_start;
goto error;
+ }
if (ret > 0)
break;
leaf = path->nodes[0];