Merge tag 'xfs-delay-ready-attrs-v20.1' of https://github.com/allisonhenderson/xfs_work into xfs-5.14-merge4

xfs: Delay Ready Attributes

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 v19: Added Darricks fix for the remote block accounting as well as
some minor nits about the default assert in xfs_attr_set_iter.  Spent quite
a bit of time testing this cycle to weed out any more unexpected bugs.  No new
test failures were observed with the addition of this set.

xfs: Fix default ASSERT in xfs_attr_set_iter
  Replaced the assert with ASSERT(0);

xfs: Add delay ready attr remove routines
  Added Darricks fix for remote block accounting

This series can be viewed on github here:
https://github.com/allisonhenderson/xfs_work/tree/delay_ready_attrs_v20

As well as the extended delayed attribute and parent pointer series:
https://github.com/allisonhenderson/xfs_work/tree/delay_ready_attrs_v20_extended

And the test cases:
https://github.com/allisonhenderson/xfs_work/tree/pptr_xfstestsv3
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_v20
https://github.com/allisonhenderson/xfs_work/tree/delay_ready_attrs_xfsprogs_v20_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

* tag 'xfs-delay-ready-attrs-v20.1' of https://github.com/allisonhenderson/xfs_work:
  xfs: Make attr name schemes consistent
  xfs: Fix default ASSERT in xfs_attr_set_iter
  xfs: Clean up xfs_attr_node_addname_clear_incomplete
  xfs: Remove xfs_attr_rmtval_set
  xfs: Add delay ready attr set routines
  xfs: Add delay ready attr remove routines
  xfs: Hoist node transaction handling
  xfs: Hoist xfs_attr_leaf_addname
  xfs: Hoist xfs_attr_node_addname
  xfs: Add helper xfs_attr_node_addname_find_attr
  xfs: Separate xfs_attr_node_addname and xfs_attr_node_addname_clear_incomplete
  xfs: Refactor xfs_attr_set_shortform
  xfs: Add xfs_attr_node_remove_name
  xfs: Reverse apply 72b97ea4