Btrfs fixes

Hi Linus,

We have a few fixes in my for-linus branch:

git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git for-linus

Filipe is nailing down some problems with our skinny extent variation, and Dave's patch fixes endian problems in the new super block checks.

Filipe Manana (2) commits (+4/-18):
Btrfs: fix race that makes btrfs_lookup_extent_info miss skinny extent items (+0/-8)
Btrfs: fix invalid leaf slot access in btrfs_lookup_extent() (+4/-10)

Josef Bacik (1) commits (+1/-0):
Btrfs: properly clean up btrfs_end_io_wq_cache

David Sterba (1) commits (+22/-21):
btrfs: use macro accessors in superblock validation checks

Total: (4) commits (+27/-39)

 fs/btrfs/ctree.h       |  2 +-
 fs/btrfs/disk-io.c     | 43 ++++++++++++++++++++++---------------------
 fs/btrfs/extent-tree.c | 18 ++----------------
 fs/btrfs/super.c       |  1 +
 fs/btrfs/tree-log.c    |  2 +-
 5 files changed, 27 insertions(+), 39 deletions(-)