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xfs: document what LARP means

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Christoph requested a blurb somewhere explaining exactly what LARP
means.  I don't know of a good place other than the source code (debug
knobs aren't covered in Documentation/), so here it is.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2023-12-04 12:13:26 -08:00
parent e14293803f
commit 94da54d582
1 changed files with 9 additions and 0 deletions
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9
fs/xfs/xfs_sysfs.c
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@ -229,6 +229,15 @@ pwork_threads_show(
}
XFS_SYSFS_ATTR_RW(pwork_threads);
/*
* The "LARP" (Logged extended Attribute Recovery Persistence) debugging knob
* sets the XFS_DA_OP_LOGGED flag on all xfs_attr_set operations performed on
* V5 filesystems. As a result, the intermediate progress of all setxattr and
* removexattr operations are tracked via the log and can be restarted during
* recovery. This is useful for testing xattr recovery prior to merging of the
* parent pointer feature which requires it to maintain consistency, and may be
* enabled for userspace xattrs in the future.
*/
static ssize_t
larp_store(
struct kobject *kobject,