tree 53bb771dbb18194a9d13ce2c84c81f2ab834b7e5
parent 75e7cb7fe0c391561bd3af36515be3f3c64a04c6
author Mark Fasheh <mfasheh@suse.com> 1300814426 +0000
committer root <Chris Mason chris.mason@oracle.com> 1301305062 -0400

btrfs: return EXDEV when linking from different subvolumes

btrfs_link returns EPERM if a cross-subvolume link is attempted.

However, in this case I believe EXDEV to be the more appropriate value.
>From the link(2) man page:

EXDEV  oldpath and newpath are not on the same mounted file system.  (Linux
       permits a file system to be mounted at multiple points, but link()
       does not work across different mount points, even if the same file
       system is mounted on both.)

This matters because an application may have different behaviors based on
return codes.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>