linux-kernel - [PATCH v3 0/4] btrfs: RAID stripe tree updates

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Message-Id: <20231004-rst-updates-v3-0-7729c4474ade@wdc.com>
Date:   Wed, 04 Oct 2023 00:56:15 -0700
From:   Johannes Thumshirn <johannes.thumshirn@....com>
To:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>
Cc:     Qu Wenru <wqu@...e.com>, Damien Le Moal <dlemoal@...nel.org>,
        Naohiro Aota <naohiro.aota@....com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v3 0/4] btrfs: RAID stripe tree updates

This batch of RST updates contains the on-disk format changes Qu
suggested. It drastically simplifies the write and path, especially for
RAID10.

Instead of recording all strides of a striped RAID into one stripe tree
entry, we create multiple entries per stride. This allows us to remove the
length in the stride as we can use the length from the key. Using this
method RAID10 becomes RAID1 and RAID0 becomes single from the point of
view of the stripe tree.

---
- Link to first batch: https://lore.kernel.org/r/20230918-rst-updates-v1-0-17686dc06859@wdc.com
- Link to second batch: https://lore.kernel.org/r/20230920-rst-updates-v2-0-b4dc154a648f@wdc.com

---
Johannes Thumshirn (4):
      btrfs: change RST write
      btrfs: remove stride length check on read
      btrfs: remove raid stride length in tree printer
      btrfs: remove stride length from on-disk format

 fs/btrfs/accessors.h            |   2 -
 fs/btrfs/print-tree.c           |   5 +-
 fs/btrfs/raid-stripe-tree.c     | 173 ++--------------------------------------
 include/uapi/linux/btrfs_tree.h |   2 -
 4 files changed, 7 insertions(+), 175 deletions(-)
---
base-commit: 8d3aed36ee6cac09c7bd6bee6ad67dc2a35615af
change-id: 20230915-rst-updates-8c55784ca4ef

Best regards,
-- 
Johannes Thumshirn <johannes.thumshirn@....com>