xfs: Delayed Attributes

Hi all,

This set is a subset of a larger series parent pointers. Delayed attributes allow
attribute operations (set and remove) to be logged and committed in the same
way that other delayed operations do. This allows more complex operations (like
parent pointers) to be broken up into multiple smaller transactions. To do
this, the existing attr operations must be modified to operate as a delayed
operation.  This means that they cannot roll, commit, or finish transactions.
Instead, they return -EAGAIN to allow the calling function to handle the
transaction.  In this series, we focus on only the delayed attribute portion.
We will introduce parent pointers in a later set.

The set as a whole is a bit much to digest at once, so I usually send out the
smaller sub series to reduce reviewer burn out.  But the entire extended series
is visible through the included github links.

Updates since v20: Since this series is introducing a new log item, we need to
be setting the incompat flag for older kernels that cannot parse these new
items.  I have added two patches from Darricks dev tree that handle setting and
clearing incompat flags, and a new XFS_SB_FEAT_INCOMPAT_LOG_DELATTR flag is
added and set in patch 6.


This series can be viewed on github here:
https://github.com/allisonhenderson/xfs_work/tree/delayed...

As well as the extended delayed attribute and parent pointer series:
https://github.com/allisonhenderson/xfs_work/tree/delayed...

And the test cases:
https://github.com/allisonhenderson/xfs_work/tree/pptr_xf...
In order to run the test cases, you will need have the corresponding xfsprogs
changes as well.  Which can be found here:
https://github.com/allisonhenderson/xfs_work/tree/delayed...
https://github.com/allisonhenderson/xfs_work/tree/delayed...

To run the xfs attributes tests run:
check -g attr

To run as delayed attributes run:
export MOUNT_OPTIONS="-o delattr"
check -g attr

To run parent pointer tests:
check -g parent

I've also made the corresponding updates to the user space side as well, and ported anything
they need to seat correctly.

Questions, comment and feedback appreciated! 

Allison

Allison Collins (1):
  xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred

Allison Henderson (12):
  xfs: Return from xfs_attr_set_iter if there are no more rmtblks to
    process
  xfs: Add state machine tracepoints
  xfs: Rename __xfs_attr_rmtval_remove
  xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans
  xfs: Set up infrastructure for deferred attribute operations
  xfs: Implement attr logging and replay
  RFC xfs: Skip flip flags for delayed attrs
  xfs: Remove unused xfs_attr_*_args
  xfs: Add delayed attributes error tag
  xfs: Add delattr mount option
  xfs: Merge xfs_delattr_context into xfs_attr_item
  xfs: Add helper function xfs_attr_leaf_addname

 fs/xfs/Makefile                 |   1 +
 fs/xfs/libxfs/xfs_attr.c        | 422 ++++++++++----------
 fs/xfs/libxfs/xfs_attr.h        |  57 ++-
 fs/xfs/libxfs/xfs_attr_leaf.c   |   3 +-
 fs/xfs/libxfs/xfs_attr_remote.c |  38 +-
 fs/xfs/libxfs/xfs_attr_remote.h |   6 +-
 fs/xfs/libxfs/xfs_defer.c       |   1 +
 fs/xfs/libxfs/xfs_defer.h       |   3 +
 fs/xfs/libxfs/xfs_errortag.h    |   4 +-
 fs/xfs/libxfs/xfs_format.h      |   4 +-
 fs/xfs/libxfs/xfs_log_format.h  |  44 ++-
 fs/xfs/libxfs/xfs_log_recover.h |   2 +
 fs/xfs/scrub/common.c           |   2 +
 fs/xfs/xfs_acl.c                |   2 +
 fs/xfs/xfs_attr_item.c          | 856 ++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_attr_item.h          |  52 +++
 fs/xfs/xfs_attr_list.c          |   1 +
 fs/xfs/xfs_error.c              |   3 +
 fs/xfs/xfs_ioctl.c              |   2 +
 fs/xfs/xfs_ioctl32.c            |   2 +
 fs/xfs/xfs_iops.c               |   2 +
 fs/xfs/xfs_log_recover.c        |  12 +-
 fs/xfs/xfs_mount.h              |   1 +
 fs/xfs/xfs_ondisk.h             |   2 +
 fs/xfs/xfs_super.c              |   6 +-
 fs/xfs/xfs_trace.h              |  25 ++
 fs/xfs/xfs_xattr.c              |   3 +
 27 files changed, 1309 insertions(+), 247 deletions(-)
 create mode 100644 fs/xfs/xfs_attr_item.c
 create mode 100644 fs/xfs/xfs_attr_item.h

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2.7.4