Hi all, These patches fix a few problems that I noticed in the code that deals with old btree blocks after a successful repair. First, I observed that it is possible for repair to incorrectly invalidate and delete old btree blocks if they were crosslinked. The solution here is to consult the reverse mappings for each block in the extent -- singly owned blocks are invalidated and freed, whereas for crosslinked blocks, we merely drop the incorrect reverse mapping. A largeish change in this patchset is moving the reaping code to a separate file, because the code are mostly interrelated static functions. For now this also drops the ability to reap file blocks, which will return when we add the bmbt repair functions. Second, we convert the reap function to use EFIs so that we can commit to freeing as many blocks in as few transactions as we dare. We would like to free as many old blocks as we can in the same transaction that commits the new structure to the ondisk filesystem to minimize the number of blocks that leak if the system crashes before the repair fully completes. The third change made in this series is to avoid tripping buffer cache assertions if we're merely scanning the buffer cache for buffers to invalidate, and find a non-stale buffer of the wrong length. This is primarily cosmetic, but makes my life easier. The fourth change restructures the reaping code to try to process as many blocks in one go as possible, to reduce logging traffic. The last change switches the reaping mechanism to use per-AG bitmaps defined in a previous patchset. This should reduce type confusion when reading the source code. 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-reap-fixes xfsprogs git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=repair-reap-fixes --- fs/xfs/Makefile | 1 fs/xfs/scrub/agheader_repair.c | 75 +++--- fs/xfs/scrub/bitmap.c | 78 ------ fs/xfs/scrub/bitmap.h | 10 - fs/xfs/scrub/reap.c | 499 ++++++++++++++++++++++++++++++++++++++++ fs/xfs/scrub/reap.h | 12 + fs/xfs/scrub/repair.c | 366 ++++------------------------- fs/xfs/scrub/repair.h | 10 - fs/xfs/scrub/trace.h | 72 +++--- fs/xfs/xfs_buf.c | 9 + fs/xfs/xfs_buf.h | 13 + 11 files changed, 666 insertions(+), 479 deletions(-) create mode 100644 fs/xfs/scrub/reap.c create mode 100644 fs/xfs/scrub/reap.h
