linux-kernel - [PATCH v3 0/5] btrfs: rst: updates for RAID stripe tree

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Date: Mon, 01 Jul 2024 12:25:14 +0200
From: Johannes Thumshirn <jth@...nel.org>
To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, 
 David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v3 0/5] btrfs: rst: updates for RAID stripe tree

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.

Note: There still is a known bug triggering a crash on btrfs/06[01]. I'm
working on it, but I've not yet root caused it.

---
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 (5):
      btrfs: replace stripe extents
      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: rst: don't print tree dump in case lookup fails

 fs/btrfs/Makefile                       |   3 +-
 fs/btrfs/ctree.c                        |   1 +
 fs/btrfs/raid-stripe-tree.c             | 143 ++++++++++++++----
 fs/btrfs/raid-stripe-tree.h             |   5 +
 fs/btrfs/tests/btrfs-tests.c            |   3 +
 fs/btrfs/tests/btrfs-tests.h            |   1 +
 fs/btrfs/tests/raid-stripe-tree-tests.c | 258 ++++++++++++++++++++++++++++++++
 fs/btrfs/volumes.c                      |  28 ++--
 8 files changed, 401 insertions(+), 41 deletions(-)
---
base-commit: 9c681cca9c5f8e3bd5891f3944f7b9ce4d14f4ec
change-id: 20240610-b4-rst-updates-d0aa696b9d5a

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