various updates for -rc3

Hey Chris,

Here are the cluster rework patches from Alexandre along with my tracepoints patch and a couple of bugfixes. This should fix the panics we've been seeing when running xfstests 13 in a loop. The cluster fixes I've been testing for a while, and the tracepoints patch I used to profile the new clustering stuff to make sure it was giving us a good behavior. I have a repo with some tools to use the allocator tracepoints

git://github.com/josefbacik/btrfs-tracing.git

In all respects Alexandre's patches work wonders. You can pull from

git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-work.git for-chris

which is based off of your for-linus branch. The shortlog and diffstat is attached below. Thanks,

Josef

Alexandre Oliva (3):
Revamp btrfs cluster creation logic.
Drop gap detection from btrfs.
Require at least one extent of the requested size, but accept other smaller ones except when SSD_SPREAD is enabled.

Josef Bacik (3):
Btrfs: add allocator tracepoints
Btrfs: wait on caching if we're loading the free space cache
Btrfs: clear pages dirty for io and set them extent mapped

 fs/btrfs/ctree.h             |    3 +-
 fs/btrfs/extent-tree.c       |  130 ++++++++++++++++++++++----------
 fs/btrfs/free-space-cache.c  |  130 ++++++++++++++++----------------
 include/trace/events/btrfs.h |  173 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 329 insertions(+), 107 deletions(-)