[GIT PULL] Btrfs updates

[Chris Mason <chris.mason@oracle.com>]

Hi everyone,

The for-linus branch of the btrfs-unstable git tree:

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

Has our collection of features and fixes for 2.6.38-rc1.  The git tree
is actually against 2.6.36 and these commits have been tested against
.36, .37 and Linus' current git.  There's no particular reason for the
.36 part, other than it's what one of my build boxes was running.

The highlights this time around are LZO compression from Li Zefan and a
large collection of multi-device fixes from Miao Xie.  Liubo kicked in
the start of our forced-readonly support, which will be the building
block for ripping out a big collection of BUG_ONs and replacing them
with kinder gentler error messages.

Li Zefan also added readonly snapshot support, and I'll have the
corresponding btrfs-progs changes integrated this week.

This pull does have a duplicate for the btrfs ctree.c build fix that
Linus already has in his tree.  Git merge seems to do magic on this one,
it applies without doing a duplicate #include.

Li Zefan (9) commits (+1354/-542):
    Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctls (+85/-0)
    btrfs: Allow to specify compress method when defrag (+26/-2)
    btrfs: Allow to add new compression algorithm (+473/-282)
    btrfs: Extract duplicate decompress code (+115/-194)
    Btrfs: Refactor btrfs_ioctl_snap_create() (+40/-44)
    Btrfs: Add readonly snapshots support (+75/-10)
    btrfs: Add lzo compression support (+527/-8)
    btrfs: Fix error handling in zlib (+8/-0)
    btrfs: Fix bugs in zlib workspace (+5/-2)

Miao Xie (6) commits (+695/-186):
    btrfs: make the chunk allocator utilize the devices better (+300/-103)
    btrfs: try to reclaim some space when chunk allocation fails (+7/-2)
    btrfs: fix wrong free space information of btrfs (+286/-7)
    btrfs: restructure find_free_dev_extent() (+91/-68)
    btrfs: fix wrong calculation of stripe size (+8/-2)
    btrfs: fix wrong data space statistics (+3/-4)

Jesper Juhl (2) commits (+5/-1):
    btrfs: Don't pass NULL ptr to func that may deref it. (+2/-0)
    btrfs: Mem leak in btrfs_get_acl() (+3/-1)

Tsutomu Itoh (2) commits (+17/-0):
    btrfs: Fix memory leak in btrfs_read_fs_root_no_radix() (+1/-0)
    btrfs: check NULL or not (+16/-0)

Stefan Schmidt (1) commits (+1/-0):
    fs/btrfs: Fix build of ctree

Ben Hutchings (1) commits (+4/-0):
    btrfs: Require CAP_SYS_ADMIN for filesystem rebalance

Chris Mason (1) commits (+2/-1):
    Btrfs: fix off by one while setting block groups readonly

Dave Young (1) commits (+8/-4):
    btrfs: mount failure return value fix

liubo (1) commits (+523/-2):
    Btrfs: forced readonly mounts on errors

Josef Bacik (1) commits (+0/-5):
    Btrfs: don't warn if we get ENOSPC in btrfs_block_rsv_check

Total: (25) commits (+2609/-741)

 fs/btrfs/Kconfig        |    2 +
 fs/btrfs/Makefile       |    2 +-
 fs/btrfs/acl.c          |    4 +-
 fs/btrfs/btrfs_inode.h  |    2 +-
 fs/btrfs/compression.c  |  329 ++++++++++++++++++++++++-
 fs/btrfs/compression.h  |   72 ++++--
 fs/btrfs/ctree.c        |    8 +
 fs/btrfs/ctree.h        |   49 ++++-
 fs/btrfs/disk-io.c      |  412 ++++++++++++++++++++++++++++++-
 fs/btrfs/disk-io.h      |    1 +
 fs/btrfs/extent-tree.c  |   90 ++++++-
 fs/btrfs/extent_io.c    |    7 +-
 fs/btrfs/extent_io.h    |   17 ++-
 fs/btrfs/extent_map.c   |    2 +
 fs/btrfs/extent_map.h   |    3 +-
 fs/btrfs/file.c         |   13 +
 fs/btrfs/inode.c        |   90 +++++---
 fs/btrfs/ioctl.c        |  220 +++++++++++++----
 fs/btrfs/ioctl.h        |   12 +-
 fs/btrfs/lzo.c          |  420 +++++++++++++++++++++++++++++++
 fs/btrfs/ordered-data.c |   18 ++-
 fs/btrfs/ordered-data.h |    8 +-
 fs/btrfs/super.c        |  281 ++++++++++++++++++++--
 fs/btrfs/transaction.c  |   11 +
 fs/btrfs/transaction.h  |    1 +
 fs/btrfs/volumes.c      |  626 ++++++++++++++++++++++++++++++++++-------------
 fs/btrfs/volumes.h      |   27 ++
 fs/btrfs/xattr.c        |   18 ++
 fs/btrfs/zlib.c         |  369 ++++++----------------------
 29 files changed, 2491 insertions(+), 623 deletions(-)