[Bug 204223] [fstests generic/388 on xfs]: 4.19.58 xfs_nocrc / xfs_reflink null pointer dereference at xfs_trans_brelse+0x21

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=204223

--- Comment #8 from Luis Chamberlain (mcgrof@kernel.org) ---
These commits fix this crash:

xfs: Move fs/xfs/xfs_attr.h to fs/xfs/libxfs/xfs_attr.h
xfs: Add helper function xfs_attr_try_sf_addname
xfs: Add attibute set and helper functions
xfs: Add attibute remove and helper functions
xfs: always rejoin held resources during defer roll

I've left generic/388 running over time and it ran up to 247 times
successfully, and failed but at least without a crash in the end.

In particular the last commit has has some fixes to correct bhold callers to
release held buffers correctly merged into the patch, which IMHO should have
been split up into a separate patch.

Trying to extract the exact minor fix is difficult due to the amount of churn
from the prior patches. We'll have to try to do that work somehow or just
consider merging all of these.

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