[GIT PULL] Btrfs updates for 2.6.31-rc

[Chris Mason]

Hello everyone,

We've added two small incrementals for the btrfs async block group
caching.  One fixes a race between the caching thread and transaction
commit.  We haven't seen this one triggered in testing, but it still is
a valid fix.

The second patch makes sure the caching threads don't stall
transaction commits.

Linus, both of these are in the master branch at:

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

Chris Mason (1) commits (+14/-2):
    Btrfs: be more polite in the async caching threads

Yan Zheng (1) commits (+14/-10):
    Btrfs: preserve commit_root for async caching

Total: (2) commits

 fs/btrfs/ctree.h       |    4 +---
 fs/btrfs/disk-io.c     |    2 +-
 fs/btrfs/extent-tree.c |   11 ++++++-----
 fs/btrfs/transaction.c |   22 +++++++++++++++++++---
 fs/btrfs/transaction.h |    1 +
 5 files changed, 28 insertions(+), 12 deletions(-)

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