Hi folks, I am /very/ pleased to announce that online repair for XFS is completely finished. For those of you who have been following along all this time, this means that part 1 and part 2 are done! With the addition in part 2 of directory parent pointers patchset, xfs_scrub gains the ability to correct broken links and loops in the directory tree. Part 2 also adds a faster FITRIM implementation, improved detection of malicious filenames, and a vectorized scrub mode that cuts the runtime by 20%. Code coverage averages around ~75% for the online fsck code (and ~85% for the rest of XFS), and the kernel can now rebuild 90% of the corruptions that can manifest on a mountable filesystem. The code itself lives in my git trees, which I've just updated: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/log/?h=vectorized-scrub https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=vectorized-scrub https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfstests-dev.git/log/?h=scrub-directory-tree As I have now been testing online repair in its various stages [on my testing cloud] for two years and the fstests cloud has nearly cleared 300 million successful filesystem repairs, I am discontinuing all notices about "This is an extraordinary way to destroy your data". It works, and it's time to merge it to get broader testing. A big thank you to Allison Henderson, Catherine Hoang for their work on the directory parent pointers feature; Chandan Babu for reviewing the design documentation; and Dave Chinner and Matthew Wilcox for staring at the code longer than is probably healthy. 8-) Stay tuned for more exciting announcements! --Darrick
