Btrfs fixes

Hi Linus,

We've got a variety pack of fixes in the for-linus branch of the btrfs repo:

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

These are all smaller fixes caught from different testers, benchmarks and the occasional compiler warning.

Josef Bacik (3) commits (+3/-2):
Btrfs: use cluster->window_start when allocating from a cluster bitmap (+1/-1)
Btrfs: advance window_start if we're using a bitmap (+1/-0)
Btrfs: make sure a bitmap has enough bytes (+1/-1)

Stefan Behrens (1) commits (+6/-5):
Btrfs: fix warning for 32-bit build of fs/btrfs/check-integrity.c

Jan Schmidt (1) commits (+2/-2):
Btrfs: fix uninit warning in backref.c

Liu Bo (1) commits (+1/-1):
Btrfs: do not defrag a file partially

Mitch Harder (1) commits (+2/-0):
Btrfs: Check for NULL page in extent_range_uptodate

Chris Mason (1) commits (+8/-2):
Btrfs: fix reservations in btrfs_page_mkwrite

David Sterba (1) commits (+7/-0):
btrfs: mask out gfp flags in releasepage

Jan Kara (1) commits (+4/-2):
btrfs: Fix busyloops in transaction waiting code

Miao Xie (1) commits (+27/-22):
Btrfs: fix enospc error caused by wrong checks of the chunk

Total: (11) commits (+60/-36)

 fs/btrfs/backref.c          |    4 +-
 fs/btrfs/check-integrity.c  |   11 +++++----
 fs/btrfs/disk-io.c          |    7 ++++++
 fs/btrfs/extent-tree.c      |   49 +++++++++++++++++++++++-------------------
 fs/btrfs/extent_io.c        |    2 +
 fs/btrfs/free-space-cache.c |    5 ++-
 fs/btrfs/inode.c            |   10 +++++++-
 fs/btrfs/ioctl.c            |    2 +-
 fs/btrfs/tree-log.c         |    6 +++-
 9 files changed, 60 insertions(+), 36 deletions(-)