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Subject[GIT PULL] a large btrfs update
Hi Linus,

Since this has a conflict, I've split it into two branches.

# against 3.5, my diffstat is based on this branch
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git for-linus

# against your git as of today
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git for-linus-merged

for-linus-merged has an extra commit on top as well that changes the
btrfs send/receive code to Al's new dentry_open. It's a small commit,
and my guess is that you'll cherry pick it and do your own merge.

I will be on vacation next week, but Josef Bacik is in charge of dealing
with any problems and sending fixes. He has git trees on kernel.org, so
there won't be any problems sending things in.

This pull request is very large, and the two main features in here have
been under testing/devel for quite a while.

We have subvolume quotas from the strato developers. This enables full
tracking of how many blocks are allocated to each subvolume (and all
snapshots) and you can set limits on a per-subvolume basis. You can
also create quota groups and toss multiple subvolumes into a big group.
It's everything you need to be a web hosting company and give each user
their own subvolume.

The userland side of the quotas is being refreshed, they'll send out
details on where to grab it soon.

Next is the kernel side of btrfs send/receive from Alexander Block.
This leverages the same infrastructure as the quota code to figure out
relationships between blocks and their owners. It can then compute the
difference between two snapshots and sends the diffs in a neutral format
into userland.
The basic model:

create a snapshot
send that snapshot as the initial backup
make changes
create a second snapshot
send the incremental as a backup
delete the first snapshot
(use the second snapshot for the next incremental)

The receive portion is all in userland, and in the 'next' branch of my
btrfs-progs repo.

There's still some work to do in terms of optimizing the send side from
kernel to userland. The really important part is figuring out how two
snapshots are different, and this is where we are concentrating right
now. The initial send of a dataset is a little slower than tar, but the
incremental sends are dramatically faster than what rsync can do.

On top of all of that, we have a nice queue of fixes, cleanups and
optimizations.

Liu Bo (13) commits (+120/-67):
Btrfs: check write access to mount earlier while creating snapshots (+11/-11)
Btrfs: fix a bug of writting free space cache during balance (+21/-3)
Btrfs: fix btrfs_is_free_space_inode to recognize btree inode (+4/-2)
Btrfs: fix typo in cow_file_range_async and async_cow_submit (+2/-2)
Btrfs: make btrfs's allocation smoothly with preallocation (+3/-1)
Btrfs: use mnt_want_write_file instead of mnt_want_write (+2/-2)
Btrfs: do not set subvolume flags in readonly mode (+28/-14)
Btrfs: kill root from btrfs_is_free_space_inode (+16/-15)
Btrfs: do not abort transaction in prealloc case (+5/-1)
Btrfs: remove redundant r/o check for superblock (+0/-7)
Btrfs: add ro notification to dump_space_info (+3/-3)
Btrfs: improve multi-thread buffer read (+24/-5)
Btrfs: do not count in readonly bytes (+1/-1)

Arne Jansen (12) commits (+2488/-26):
Btrfs: Test code to change the order of delayed-ref processing (+49/-0)
Btrfs: check the root passed to btrfs_end_transaction (+12/-0)
Btrfs: qgroup implementation and prototypes (+1681/-1)
Btrfs: added helper to create new trees (+83/-1)
Btrfs: add helper for tree enumeration (+77/-0)
Btrfs: qgroup state and initialization (+31/-0)
Btrfs: add helper for tree enumeration (+75/-0)
Btrfs: quota tree support and startup (+42/-6)
Btrfs: hooks to reserve qgroup space (+29/-0)
Btrfs: add qgroup inheritance (+61/-18)
Btrfs: qgroup on-disk format (+136/-0)
Btrfs: add qgroup ioctls (+212/-0)

Josef Bacik (8) commits (+160/-133):
Btrfs: don't return true in releasepage unless we actually freed the eb (+5/-4)
Btrfs: lock the transition from dirty to writeback for an eb (+9/-0)
Btrfs: flush delayed inodes if we're short on space (+83/-38)
Btrfs: fix potential race in extent buffer freeing (+3/-6)
Btrfs: change how we indicate we're adding csums (+18/-15)
Btrfs: rework shrink_delalloc (+24/-57)
Btrfs: add DEVICE_READY ioctl (+18/-2)
Btrfs: remove ->dirty_inode (+0/-11)

Jan Schmidt (5) commits (+295/-225):
Btrfs: join tree mod log code with the code holding back delayed refs (+240/-219)
Btrfs: hooks for qgroup to record delayed refs (+36/-6)
Btrfs: fix buffer leak in btrfs_next_old_leaf (+1/-0)
Btrfs: fix buffer leak in btrfs_next_old_leaf (+1/-0)
Btrfs: call the qgroup accounting functions (+17/-0)

Alexander Block (5) commits (+5465/-21):
Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive (+4717/-1)
Btrfs: introduce subvol uuids and times (+292/-15)
Btrfs: don't update atime on RO subvolumes (+7/-0)
Btrfs: add btrfs_compare_trees function (+440/-0)
Btrfs: make iref_to_path non static (+9/-5)

Chris Mason (5) commits (+22/-9):
Btrfs: call the ordered free operation without any locks held (+8/-1)
Btrfs: don't wait around for new log writers on an SSD (+2/-1)
Btrfs: add a barrier before a waitqueue_active check (+1/-0)
Btrfs: reduce calls to wake_up on uncontended locks (+9/-5)
Btrfs: uninit variable fixes in send/receive (+2/-2)

Stefan Behrens (3) commits (+9/-4):
Btrfs: avoid I/O repair BUG() from btree_read_extent_buffer_pages() (+1/-1)
Btrfs: remove unwanted printk() for btrfs device I/O stats (+0/-3)
Btrfs: suppress printk() if all device I/O stats are zero (+8/-0)

Li Zefan (3) commits (+159/-122):
Btrfs: kill free_space pointer from inode structure (+10/-19)
Btrfs: zero unused bytes in inode item (+3/-0)
Btrfs: rewrite BTRFS_SETGET_FUNCS (+146/-103)

Ilya Dryomov (2) commits (+3/-3):
Btrfs: do not ignore errors from btrfs_cleanup_fs_roots() when mounting (+2/-2)
Btrfs: do not return EINVAL instead of ENOMEM from open_ctree() (+1/-1)

Dan Carpenter (2) commits (+4/-3):
Btrfs: small naming cleanup in join_transaction() (+2/-2)
Btrfs: fix error handling in __add_reloc_root() (+2/-1)

David Sterba (2) commits (+23/-18):
btrfs: allow cross-subvolume file clone (+8/-3)
btrfs: join DEV_STATS ioctls to one (+15/-15)

Arnd Hannemann (1) commits (+8/-1):
Btrfs: allow mount -o remount,compress=no

Anand Jain (1) commits (+1/-1):
btrfs read error corrected message floods the console during recovery

Mitch Harder (1) commits (+20/-14):
Btrfs: Check INCOMPAT flags on remount and add helper function

Tsutomu Itoh (1) commits (+3/-3):
Btrfs: return error of btrfs_update_inode() to caller

Andrew Mahone (1) commits (+5/-3):
btrfs: ignore unfragmented file checks in defrag when compression enabled - rebased

Total: (65) commits

fs/btrfs/Makefile | 2 +-
fs/btrfs/async-thread.c | 9 +-
fs/btrfs/backref.c | 40 +-
fs/btrfs/backref.h | 7 +-
fs/btrfs/btrfs_inode.h | 14 +-
fs/btrfs/check-integrity.c | 7 +-
fs/btrfs/ctree.c | 775 +++++++-
fs/btrfs/ctree.h | 368 +++-
fs/btrfs/delayed-inode.c | 23 +-
fs/btrfs/delayed-inode.h | 2 +
fs/btrfs/delayed-ref.c | 56 +-
fs/btrfs/delayed-ref.h | 62 +-
fs/btrfs/disk-io.c | 150 +-
fs/btrfs/disk-io.h | 6 +
fs/btrfs/extent-tree.c | 358 ++--
fs/btrfs/extent_io.c | 58 +-
fs/btrfs/file-item.c | 4 +-
fs/btrfs/free-space-cache.c | 2 +-
fs/btrfs/inode.c | 42 +-
fs/btrfs/ioctl.c | 471 ++++-
fs/btrfs/ioctl.h | 97 +-
fs/btrfs/locking.c | 14 +-
fs/btrfs/qgroup.c | 1571 +++++++++++++++
fs/btrfs/relocation.c | 3 +-
fs/btrfs/root-tree.c | 107 +-
fs/btrfs/send.c | 4570 +++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/send.h | 133 ++
fs/btrfs/struct-funcs.c | 196 +-
fs/btrfs/super.c | 28 +-
fs/btrfs/transaction.c | 101 +-
fs/btrfs/transaction.h | 12 +
fs/btrfs/tree-log.c | 4 +-
fs/btrfs/volumes.c | 25 +-
fs/btrfs/volumes.h | 4 +-
fs/inode.c | 2 +
35 files changed, 8690 insertions(+), 633 deletions(-)

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