tree 3573c8d79e1936e8c921a3be77abda35124e0d78
parent 0660b5af3f7ac0fac69de975914e1f4a3a586fb3
author Chris Mason <chris.mason@oracle.com> 1226974464 -0500
committer Chris Mason <chris.mason@oracle.com> 1226974464 -0500

Btrfs: prevent loops in the directory tree when creating snapshots

For a directory tree:

/mnt/subvolA/subvolB

btrfsctl -s /mnt/subvolA/subvolB /mnt

Will create a directory loop with subvolA under subvolB.  This
commit uses the forward refs for each subvol and snapshot to error out
before creating the loop.

Signed-off-by: Chris Mason <chris.mason@oracle.com>