Btrfs fixes

Hi Linus

The last pull was missing two fixes, which you can find in the master branch of the btrfs-unstable repo:

git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable.git master

Josef's commit helps close another enospc problem, and the other one fixes an oops where we try to allocate a zero sized extent off the drive.

Chris Mason (1) commits (+6/-0):
Btrfs: make sure the chunk allocator doesn't create zero length chunks

Josef Bacik (1) commits (+15/-5):
Btrfs: fix data enospc check overflow

Total: (2) commits

 fs/btrfs/extent-tree.c |   20 +++++++++++++++-----
 fs/btrfs/volumes.c     |    6 ++++++
 2 files changed, 21 insertions(+), 5 deletions(-)