[PATCH 0/3] flush delalloc by multi-task

[Miao Xie <miaox@cn.fujitsu.com>]

This patchset introduce multi-task delalloc flush, it can make the delalloc
flush more faster. And besides that, it also can fix the problem that we join
the same transaction handler more than 2 times.

Implementation:
- Create a new worker pool.
- Queue the inode with pending delalloc into the work queue of the worker pool
  when we want to force them into the disk, and then we will wait till all the
  works we submit are done. 
- The ordered extents also can be queued into this work queue. The process is
  similar to the second one.

Miao Xie (3):
      Btrfs: make delalloc inodes be flushed by multi-task
      Btrfs: make ordered operations be handled by multi-task
      Btrfs: make ordered extent be flushed by multi-task

 fs/btrfs/ctree.h        |   14 +++++++
 fs/btrfs/disk-io.c      |    7 ++++
 fs/btrfs/inode.c        |   78 ++++++++++++++++++++++++++++++++++++++---
 fs/btrfs/ordered-data.c |   87 ++++++++++++++++++++++++++++++++++-------------
 fs/btrfs/ordered-data.h |    7 +++-
 fs/btrfs/relocation.c   |    6 +++-
 fs/btrfs/transaction.c  |   24 ++++++++++---
 7 files changed, 185 insertions(+), 38 deletions(-)