Btrfs: ignore orphan qgroup relations

If a qgroup that has still assignments is deleted by the user, the corresponding
relations are left in the tree. This leads to an unmountable filesystem.
With this patch, those relations are simple ignored.

Reported-by: Eric Hopper <hopper@omnifarious.org>
Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index fe9d02c45f8e..28f2b39f6a25 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -379,6 +379,13 @@ next1:
 
                 ret = add_relation_rb(fs_info, found_key.objectid,
                                       found_key.offset);
+                if (ret == -ENOENT) {
+                        printk(KERN_WARNING
+                                "btrfs: orphan qgroup relation 0x%llx->0x%llx\n",
+                                (unsigned long long)found_key.objectid,
+                                (unsigned long long)found_key.offset);
+                        ret = 0;        /* ignore the error */
+                }
                 if (ret)
                         goto out;
 next2: