This is a new version of Arne's qgroup patches from last October. The
old patches didn't get the backref walking right, which is now based on
the tree modification log.
You can limit the space available to subvolumes or any group of
subvolumes. You can determine the amount of space that will get freed
when deleting a snapshot.
The initial scan is still missing, so expect negative counters when you
enable quotas on a non-empty volume and then delete stuff.
Arne's introduction and concept description can still be found at
http://sensille.com/qgroups.pdf
You can pull these patches from my git repository
git://git.jan-o-sch.net/btrfs-unstable qgroup
The user mode patches required were sent at October 11, 2011 by Arne,
subject "[PATCH v0] btrfs-progs: add qgroup commands".
I tried to include some fair benchmark results with this cover letter.
However, I tried several disk benchmarks from the phoronix test suite,
none of them resulted in any write throughput decrease. I will have to
create a more realistic setup on my own to benchmark the impact of
qgroups (suggestions welcome). For now, I just wanted to get that patch
set out :-)
Thanks,
-Jan
Arne Jansen (11):
Btrfs: qgroup on-disk format
Btrfs: add helper for tree enumeration
Btrfs: check the root passed to btrfs_end_transaction
Btrfs: added helper to create new trees
Btrfs: qgroup state and initialization
Btrfs: Test code to change the order of delayed-ref processing
Btrfs: qgroup implementation and prototypes
Btrfs: quota tree support and startup
Btrfs: hooks to reserve qgroup space
Btrfs: add qgroup ioctls
Btrfs: add qgroup inheritance
Jan Schmidt (4):
Btrfs: fix buffer leak in btrfs_next_old_leaf
Btrfs: join tree mod log code with the code holding back delayed refs
Btrfs: call the qgroup accounting functions
Btrfs: hooks for qgroup to record delayed refs
fs/btrfs/Makefile | 2 +-
fs/btrfs/backref.c | 30 +-
fs/btrfs/backref.h | 3 +-
fs/btrfs/ctree.c | 348 ++++++++----
fs/btrfs/ctree.h | 233 +++++++-
fs/btrfs/delayed-ref.c | 56 +-
fs/btrfs/delayed-ref.h | 62 +--
fs/btrfs/disk-io.c | 134 ++++-
fs/btrfs/disk-io.h | 6 +
fs/btrfs/extent-tree.c | 119 ++++-
fs/btrfs/ioctl.c | 244 +++++++-
fs/btrfs/ioctl.h | 62 ++-
fs/btrfs/qgroup.c | 1571 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/transaction.c | 57 ++-
fs/btrfs/transaction.h | 11 +
15 files changed, 2696 insertions(+), 242 deletions(-)
create mode 100644 fs/btrfs/qgroup.c
--
1.7.3.4
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