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

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