[PATCH v17 00/11] xfs: Delay Ready Attributes

[Allison Henderson <allison.henderson@oracle.com>]

Hi all,

This set is a subset of a larger series for Dealyed Attributes. Which is a
subset of a yet larger series for 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 v16: Mostly just review feed back from the previous revision.
I've tracked changes below to help reviews recall the changes discussed

xfs: Reverse apply 72b97ea40d
  No change

xfs: Add xfs_attr_node_remove_cleanup
  No change

xfs: Hoist xfs_attr_set_shortform
  No change

xfs: Add helper xfs_attr_set_fmt
  No change

xfs: Separate xfs_attr_node_addname and xfs_attr_node_addname_work
  No change

xfs: Add helper xfs_attr_node_addname_find_attr
  No change

xfs: Hoist xfs_attr_node_addname
  Moved the xfs_da_state_free in xfs_attr_set_args into xfs_attr_node_addname to fix memleak

xfs: Hoist xfs_attr_leaf_addname
  Removed trace_xfs_attr_leaf_addname from trace.h

xfs: Hoist node transaction handling
  No change

xfs: Add delay ready attr remove routines
  Comment for xfs_attr_trans_roll updated
  Return error from xfs_attr_node_removename_setup call
  Changed breaks to gotos in xfs_attr_remove_iter
  Moved xfs_attr_node_removename_setup into the uninit state
  Added extra state XFS_DAS_CLNUP
  Diagram updated

xfs: Add delay ready attr set routines
  Added a xfs_trans_brelse in xfs_attr_set_args when xfs_attr_trans_roll fails
  Fixed misc nits with if/else bracket consistency
  Move XFS_DAS_FOUND_LBLK state assignment in to leaf scope
  Add extra -EAGAIN after calls to __xfs_at__xfs_attr_rmtval_remove
  Added extra state XFS_DAS_RD_LEAF and XFS_DAS_CLR_FLAG
  Diagram updated

This series can be viewed on github here:
https://github.com/allisonhenderson/xfs_work/tree/delay_ready_attrs_v17

As well as the extended delayed attribute and parent pointer series:
https://github.com/allisonhenderson/xfs_work/tree/delay_ready_attrs_v17_extended

And the test cases:
https://github.com/allisonhenderson/xfs_work/tree/pptr_xfstestsv2

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/delay_ready_attrs_xfsprogs_v17
https://github.com/allisonhenderson/xfs_work/tree/delay_ready_attrs_xfsprogs_v17_extended

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! 

Thanks all!
Allison 

Allison Henderson (11):
  xfs: Reverse apply 72b97ea40d
  xfs: Add xfs_attr_node_remove_cleanup
  xfs: Hoist xfs_attr_set_shortform
  xfs: Add helper xfs_attr_set_fmt
  xfs: Separate xfs_attr_node_addname and
    xfs_attr_node_addname_clear_incomplete
  xfs: Add helper xfs_attr_node_addname_find_attr
  xfs: Hoist xfs_attr_node_addname
  xfs: Hoist xfs_attr_leaf_addname
  xfs: Hoist node transaction handling
  xfs: Add delay ready attr remove routines
  xfs: Add delay ready attr set routines

 fs/xfs/libxfs/xfs_attr.c        | 908 ++++++++++++++++++++++++----------------
 fs/xfs/libxfs/xfs_attr.h        | 401 ++++++++++++++++++
 fs/xfs/libxfs/xfs_attr_leaf.c   |   2 +-
 fs/xfs/libxfs/xfs_attr_remote.c | 126 ++++--
 fs/xfs/libxfs/xfs_attr_remote.h |   7 +-
 fs/xfs/xfs_attr_inactive.c      |   2 +-
 fs/xfs/xfs_trace.h              |   2 -
 7 files changed, 1038 insertions(+), 410 deletions(-)

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2.7.4