tree 7833927ae6137122bea670544147be6a69f804ad
parent 3de4586c5278a28107030c336956381f69ff7a9d
author Chris Mason <chris.mason@oracle.com> 1226972546 -0500
committer Chris Mason <chris.mason@oracle.com> 1226972546 -0500

Btrfs: Give each subvol and snapshot their own anonymous devid

Each subvolume has its own private inode number space, and so we need
to fill in different device numbers for each subvolume to avoid confusing
applications.

This commit puts a struct super_block into struct btrfs_root so it can
call set_anon_super() and get a different device number generated for
each root.

btrfs_rename is changed to prevent renames across subvols.

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