Hi all, This series tackles hard problems for online repair to solve. Hard problems are defined as ones that cannot be done without running afoul of the regular xfs locking and synchronization rules. We solve these problems by adding ability to freeze the filesystem to perform a scrub operation, and then we add a couple more repair functions to deal with incorrect fs summary counters and rebuild reverse mapping btrees. 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=repair-hard-problems xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=repair-hard-problems fstests git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=repair-hard-problems --- fs/xfs/Makefile | 2 fs/xfs/libxfs/xfs_bmap.c | 34 + fs/xfs/libxfs/xfs_bmap.h | 8 fs/xfs/libxfs/xfs_fs.h | 6 fs/xfs/scrub/bitmap.c | 14 fs/xfs/scrub/bitmap.h | 1 fs/xfs/scrub/common.c | 91 +++ fs/xfs/scrub/common.h | 2 fs/xfs/scrub/fscounters.c | 90 ++- fs/xfs/scrub/fscounters_repair.c | 63 ++ fs/xfs/scrub/repair.c | 27 + fs/xfs/scrub/repair.h | 17 fs/xfs/scrub/rmap.c | 6 fs/xfs/scrub/rmap_repair.c | 1344 ++++++++++++++++++++++++++++++++++++++ fs/xfs/scrub/scrub.c | 14 fs/xfs/scrub/scrub.h | 1 fs/xfs/scrub/trace.h | 51 + fs/xfs/xfs_icache.c | 3 fs/xfs/xfs_icache.h | 6 fs/xfs/xfs_mount.h | 7 fs/xfs/xfs_super.c | 47 + fs/xfs/xfs_trans.c | 5 22 files changed, 1796 insertions(+), 43 deletions(-) create mode 100644 fs/xfs/scrub/fscounters_repair.c create mode 100644 fs/xfs/scrub/rmap_repair.c
