Hi all, This is the eighth revision of a patchset that adds to XFS kernel support for online metadata scrubbing and repair. There aren't any on-disk format changes. Changes since v7 include adding scrubbers for metadata buffers that were sitting around in memory before scrub started, scrubbers for directory parent pointers, and scrubbers for quota counters. I have been performing daily online scrubs of my XFS filesystems for several months now, with surprisingly few problems. Online scrub/repair support consists of four major pieces -- first, an ioctl that maps physical extents to their owners (GETFSMAP; already in 4.12); second, various in-kernel metadata scrubbing ioctls to examine metadata records and cross-reference them with other filesystem metadata; third, an in-kernel mechanism for rebuilding damaged metadata objects and btrees; and fourth, a userspace component to coordinate scrubbing and repair operations. This new utility, xfs_scrub, is separate from the existing offline xfs_repair tool. The program uses various XFS ioctls to iterate all XFS metadata and asks the kernel to check the metadata and repair it if necessary. Per reviewer request, the v8 patch series will be broken into multiple smaller series -- the first series adds the scrub functionality, and the second series will contain all the userspace code. The third series will add cross-referencing checks, and the fourth series will add online repair functionality. While I understand that reviewer bandwidth is limited, I would like to get this series prepped for 4.14, if possible. I have isolated the scrub code such that it can be compiled out entirely, in the hopes that we can stabilize the code while not exposing regular users to riskier code. If you're going to start using this mess, you probably ought to just pull from my git trees. The kernel patches[1] should apply against 4.13-rc1. xfsprogs[2] and xfstests[3] can be found in their usual places. The git trees contain all four series' worth of changes. This is an extraordinary way to eat your data. Enjoy! Comments and questions are, as always, welcome. --D [1] https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=djwong-devel [2] https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=djwong-devel [3] https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=djwong-devel -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
