tree 3a2d3e01260fe038f0b8bc0a114e4dcb4ad816d0
parent b7394eb91c703a07284501754dc735b3cd0154b7
author Liu Bo <bo.li.liu@oracle.com> 1369576231 +0000
committer Josef Bacik <jbacik@fusionio.com> 1371223803 -0400

Btrfs: allow file data clone within a file

We did not allow file data clone within the same file because of
deadlock issues.

However, we now use nested lock to avoid deadlock between the
parent directory and the child file.

So it's safe to do file clone within the same file when the two
ranges are not overlapped.

Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>