btrfs: handle ENOENT in btrfs_uuid_tree_iterate

BugLink: https://bugs.launchpad.net/bugs/1860490
commit 714cd3e8cba6841220dce9063a7388a81de03825 upstream.

If we get an -ENOENT back from btrfs_uuid_iter_rem when iterating the
uuid tree we'll just continue and do btrfs_next_item().  However we've
done a btrfs_release_path() at this point and no longer have a valid
path.  So increment the key and go back and do a normal search.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/fs/btrfs/uuid-tree.c b/fs/btrfs/uuid-tree.c
index 91caab63bdf521e5e16f30cd0e8428fb7b242a3b..76b84f2397b1bc75167e6db1d433674c0620760f 100644 (file)
--- a/fs/btrfs/uuid-tree.c
+++ b/fs/btrfs/uuid-tree.c
@@ -324,6 +324,8 @@ again_search_slot:
                                }
                                if (ret < 0 && ret != -ENOENT)
                                        goto out;
+                               key.offset++;
+                               goto again_search_slot;
                        }
                        item_size -= sizeof(subid_le);
                        offset += sizeof(subid_le);