Hi all, [Yes, this is a pre-LSFMM patch dump.] This is the sixth 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 v5 include bug fixes to the repair code to eliminate weird hangs and to do a better job of temporarily stopping access to the filesystem in the rare event that we need todo so to rebuild something. For my own dogfooding amusement, I now perform automated periodic scans of the XFS filesystems on my development workstations, which (so far) haven't destroyed anything or blown up. Online scrub/repair support consists of four major pieces -- first, an ioctl that maps physical extents to their owners (GETFSMAP; queued for 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 GETFSMAP and 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 v6 patch series has been broken into four smaller series -- this first one to add the minimum code necessary to scrub objects; a second one to add the ability to cross reference with other metadata; a third one containing the rebuilding code; and a fourth series with the userspace tool 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 4.11-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
