Hi all, This series adds regression tests for the new XFS incore unlinked backref cache feature. The first patch teaches the XFS debug knob code to _notrun a test if the kernel supports debug knob discovery (via sysfs) but doesn't advertise the particular knob. The second patch adds four new regression tests. The two generic/ tests exercise the creation and removal of O_TMPFILE files (or files which have been created, opened, unlinked, and then closed), which ensures that the filesystem can demonstrate that behavior without problems. The two xfs/ tests examine the same behavior, but they deliberately skip the backref cache lookups to ensure that the old code still works. If you're going to start using this mess, you probably ought to just pull from my git trees, which are linked below. This is an extraordinary way to destroy everything. Enjoy! Comments and questions are, as always, welcome. --D kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=incore-unlinked-list xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=incore-unlinked-list fstests git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=incore-unlinked-list
