[PATCH v4 0/7] btrfs: rst: updates for RAID stripe tree

[Johannes Thumshirn <jth@kernel.org>]

Patch 1 replaces stripe extents in case we hit a EEXIST when inserting a
stripe extent on a write. This can happen i.e. on device-replace.

Patch 2 splits a stripe extent on partial delete of a stripe.

Patch 3 adds selftests for the stripe-tree delete code, these selftests
can and will be extended to cover insert and get as well.

Patch 4 fixes a deadlock between scrub and device replace when RST is
used.

Patch 5 get's rid of the pointless tree dump in case we're not finding an
RST entry.

Patch 6 is a prep-patch form #7 and renames btrfs_io_stripe::is_scrub to
commit_root.

Patch 7 changes the read code so we're looking at the commit_root for
relocation as well.

---
Changes in v4:
- Addressed Josef's comments
- Added patches 6 & 7
- Link to v3: https://lore.kernel.org/r/20240701-b4-rst-updates-v3-0-e0437e1e04a6@kernel.org

Changes in v3:
- Drop on-disk format change as it's in for-next
- Add patches 4 & 5
- Link to v2: https://lore.kernel.org/r/20240619-b4-rst-updates-v2-0-89c34d0d5298@kernel.org

Changes in v2:
- Added selftests for delete code
- Link to v1: https://lore.kernel.org/r/20240610-b4-rst-updates-v1-0-179c1eec08f2@kernel.org

---
Johannes Thumshirn (7):
      btrfs: replace stripe extents
      btrfs: rst: don't print tree dump in case lookup fails
      btrfs: split RAID stripes on deletion
      btrfs: stripe-tree: add selftests
      btrfs: don't hold dev_replace rwsem over whole of btrfs_map_block
      btrfs: rename brtfs_io_stripe::is_scrub to commit_root
      btrfs: stripe-tree: also look at commit root on relocation

 fs/btrfs/Makefile                       |   3 +-
 fs/btrfs/bio.c                          |   3 +-
 fs/btrfs/ctree.c                        |   1 +
 fs/btrfs/raid-stripe-tree.c             | 145 +++++++++++---
 fs/btrfs/raid-stripe-tree.h             |   5 +
 fs/btrfs/scrub.c                        |   2 +-
 fs/btrfs/tests/btrfs-tests.c            |   3 +
 fs/btrfs/tests/btrfs-tests.h            |   1 +
 fs/btrfs/tests/raid-stripe-tree-tests.c | 322 ++++++++++++++++++++++++++++++++
 fs/btrfs/volumes.c                      |  28 +--
 fs/btrfs/volumes.h                      |   2 +-
 11 files changed, 470 insertions(+), 45 deletions(-)
---
base-commit: 3caaac6559396d9e668deb10345b7f3bb45f6ba9
change-id: 20240610-b4-rst-updates-d0aa696b9d5a

Best regards,
-- 
Johannes Thumshirn <jth@kernel.org>