[PATCHSET v26.0 0/5] xfs: online repair of file fork mappings

Darrick J. Wong
2023-07-27T22:21:28Z

Hi all,

In this series, online repair gains the ability to rebuild data and attr
fork mappings from the reverse mapping information. It is at this point
where we reintroduce the ability to reap file extents.

Repair of CoW forks is a little different -- on disk, CoW staging
extents are owned by the refcount btree and cannot be mapped back to
individual files. Hence we can only detect staging extents that don't
quite look right (missing reverse mappings, shared staging extents) and
replace them with fresh allocations.

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-file-mappings

xfsprogs git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfsprogs-dev.git/log/?h=repair-file-mappings

fstests git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfstests-dev.git/log/?h=repair-file-mappings
---
fs/xfs/Makefile | 2
fs/xfs/libxfs/xfs_bmap_btree.c | 112 ++++-
fs/xfs/libxfs/xfs_bmap_btree.h | 5
fs/xfs/libxfs/xfs_btree_staging.c | 11
fs/xfs/libxfs/xfs_btree_staging.h | 2
fs/xfs/libxfs/xfs_iext_tree.c | 23 +
fs/xfs/libxfs/xfs_inode_fork.c | 1
fs/xfs/libxfs/xfs_inode_fork.h | 3
fs/xfs/libxfs/xfs_refcount.c | 41 ++
fs/xfs/libxfs/xfs_refcount.h | 10
fs/xfs/scrub/bitmap.h | 28 +
fs/xfs/scrub/bmap.c | 18 +
fs/xfs/scrub/bmap_repair.c | 849 +++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/common.h | 6
fs/xfs/scrub/cow_repair.c | 609 +++++++++++++++++++++++++++
fs/xfs/scrub/reap.c | 152 ++++++-
fs/xfs/scrub/reap.h | 2
fs/xfs/scrub/repair.c | 50 ++
fs/xfs/scrub/repair.h | 11
fs/xfs/scrub/scrub.c | 20 -
fs/xfs/scrub/trace.h | 118 +++++
fs/xfs/xfs_trans.c | 95 ++++
fs/xfs/xfs_trans.h | 4
23 files changed, 2126 insertions(+), 46 deletions(-)
create mode 100644 fs/xfs/scrub/bmap_repair.c
create mode 100644 fs/xfs/scrub/cow_repair.c