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ec25bd8d98
A couple more small fixes, and new repair code. We can now automatically recover from arbitrary corrupted interior btree nodes by scanning, and we can reconstruct metadata as needed to bring a filesystem back into a working, consistent, read-write state and preserve access to whatevver wasn't corrupted. Meaning - you can blow away all metadata except for extents and dirents leaf nodes, and repair will reconstruct everything else and give you your data, and under the correct paths. If inodes are missing i_size will be slightly off and permissions/ownership/timestamps will be gone, and we do still need the snapshots btree if snapshots were in use - in the future we'll be able to guess the snapshot tree structure in some situations. IOW - aside from shaking out remaining bugs (fuzz testing is still coming), repair code should be complete and if repair ever doesn't work that's the highest priority bug that I want to know about immediately. This patchset was kindly tested by a user from India who accidentally wiped one drive out of a three drive filesystem with no replication on the family computer - it took a couple weeks but we got everything important back. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEKnAFLkS8Qha+jvQrE6szbY3KbnYFAmYNq9IACgkQE6szbY3K bnaG9w/+Od0iq4Nqx62Mf8+O5DLnZZNu3c9aUOEiuzdXlNrpUr4S9j4WwDxTb/EN 2a3ldXY5AhauZqEW7Qv+WBZvVVbm3GYH+oOYQo8V+yf1oGNB3+AGxBCCmruHJGLk 5nmwsRyVm1ihAKxn1oxwrDDPtOlxbGOlc4peR+nCY/b5QnlXegGkGfRAHO/z9bul 4JdBYBqR4KBGdevIV8EG2WVa6ASA6mF1QOboeB6INekD4klDpm41gK/0S9Uf2oXm q1PiN655YHquXbJTT9k/HtVX4WhlcaHv+R4KeZ5TEReJjB57ot/M8Rx57lgsYHP6 TeyR4Y5VYGLYqlwMK5RiKyGLB92qNFcSlg5inASyTCUNi1KKu12SpqS3+Nel6+tF gu4F4ElSvAcsmJ6LrfsfP9B8u0ULDkIyq9xBFFbLTIpLuDOqz8FcgFpZrpiO445w F6FcYXqt2/fP7gxA3GzdFjeUojIjWNMJapgpsePg/HGNArBsoAsBL8rAhAyetG3Z EOJlrJ8m59/QoPgXBpScfbS7cxk3JgrUzfSI/oKaEr2lS0YNlYjQANYHoEHTFaxA bMWKXwMkvqz49MMm5WLaMIOYDJRDtrt0qpnW7x+qU7ik/VkHeUTJr07bSRIKT0z1 yNCynYtdbeQVfekZQS6JwsyTs/ehbI1OVN8MGwVRCrQTonYz+BA= =7/rR -----END PGP SIGNATURE----- Merge tag 'bcachefs-2024-04-03' of https://evilpiepirate.org/git/bcachefs Pull bcachefs repair code from Kent Overstreet: "A couple more small fixes, and new repair code. We can now automatically recover from arbitrary corrupted interior btree nodes by scanning, and we can reconstruct metadata as needed to bring a filesystem back into a working, consistent, read-write state and preserve access to whatevver wasn't corrupted. Meaning - you can blow away all metadata except for extents and dirents leaf nodes, and repair will reconstruct everything else and give you your data, and under the correct paths. If inodes are missing i_size will be slightly off and permissions/ownership/timestamps will be gone, and we do still need the snapshots btree if snapshots were in use - in the future we'll be able to guess the snapshot tree structure in some situations. IOW - aside from shaking out remaining bugs (fuzz testing is still coming), repair code should be complete and if repair ever doesn't work that's the highest priority bug that I want to know about immediately. This patchset was kindly tested by a user from India who accidentally wiped one drive out of a three drive filesystem with no replication on the family computer - it took a couple weeks but we got everything important back" * tag 'bcachefs-2024-04-03' of https://evilpiepirate.org/git/bcachefs: bcachefs: reconstruct_inode() bcachefs: Subvolume reconstruction bcachefs: Check for extents that point to same space bcachefs: Reconstruct missing snapshot nodes bcachefs: Flag btrees with missing data bcachefs: Topology repair now uses nodes found by scanning to fill holes bcachefs: Repair pass for scanning for btree nodes bcachefs: Don't skip fake btree roots in fsck bcachefs: bch2_btree_root_alloc() -> bch2_btree_root_alloc_fake() bcachefs: Etyzinger cleanups bcachefs: bch2_shoot_down_journal_keys() bcachefs: Clear recovery_passes_required as they complete without errors bcachefs: ratelimit informational fsck errors bcachefs: Check for bad needs_discard before doing discard bcachefs: Improve bch2_btree_update_to_text() mean_and_variance: Drop always failing tests bcachefs: fix nocow lock deadlock bcachefs: BCH_WATERMARK_interior_updates bcachefs: Fix btree node reserve
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.