Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable:
Btrfs: hold trans_mutex when using btrfs_record_root_in_trans
Btrfs: make a lockdep class for the extent buffer locks
Btrfs: fs/btrfs/volumes.c: remove useless kzalloc
Btrfs: remove unused code in split_state()
Btrfs: remove btrfs_init_path
Btrfs: balance_level checks !child after access
Btrfs: Avoid using __GFP_HIGHMEM with slab allocator
Btrfs: don't clean old snapshots on sync(1)
Btrfs: use larger metadata clusters in ssd mode
Btrfs: process mount options on mount -o remount,
Btrfs: make sure all pending extent operations are complete