tree 56b7c66d03a72008e0db0bf4f58edbee5170fee1
parent bd681513fa6f2ff29aa391f01e413a2d1c59fd77
author Chris Mason <chris.mason@oracle.com> 1311711079 -0400
committer Chris Mason <chris.mason@oracle.com> 1311785206 -0400

Btrfs: make a lockdep class for each root

This patch was originally from Tejun Heo.  lockdep complains about the btrfs
locking because we sometimes take btree locks from two different trees at the
same time.  The current classes are based only on level in the btree, which
isn't enough information for lockdep to figure out if the lock is safe.

This patch makes a class for each type of tree, and lumps all the FS trees that
actually have files and directories into the same class.

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