linux-kernel - [PATCH v2 0/3] btrfs: reduce repeated calls to btrfs_need_stripe_tree

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Message-Id: <20241216-btrfs_need_stripe_tree_update-cleanups-v2-0-42b6d0274da7@kernel.org>
Date: Mon, 16 Dec 2024 09:10:38 +0100
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, 
 Filipe Manana <fdmanana@...e.com>, 
 Johannes Thumshirn <johannes.thjumshirn@....com>, 
 Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v2 0/3] btrfs: reduce repeated calls to
 btrfs_need_stripe_tree_update()

When working on RST backed RAID56 I was looking for a way to plumb the "use
RST or not" decision into the bio submission code and this way found that
we can cache the return of btrfs_need_raid_stripe_tree_update() in the
btrfs_io_context (and btrfs_io_stripe) so there's no need to do multiple
lookups for the same I/O.

Signed-off-by: Johannes Thumshirn <johannes.thjumshirn@....com>
---
Changes in v2:
- remove pointless comments
- place 'use_rst' after 'max_errors' in struct btrfs_io_context
- fix typo
- don't break lines if they're < 85 chars
- Link to v1: https://lore.kernel.org/r/20241212-btrfs_need_stripe_tree_update-cleanups-v1-0-d842b6d8d02b@kernel.org

---
Johannes Thumshirn (3):
      btrfs: cache stripe tree usage in io_geometry
      btrfs: cache RAID stripe tree decision in btrfs_io_context
      btrfs: pass btrfs_io_geometry to is_single_device_io

 fs/btrfs/bio.c     |  3 +--
 fs/btrfs/volumes.c | 15 ++++++++-------
 fs/btrfs/volumes.h |  1 +
 3 files changed, 10 insertions(+), 9 deletions(-)
---
base-commit: 043ad78b53f999f39fbc0044fd8f69d25d300f4e
change-id: 20241212-btrfs_need_stripe_tree_update-cleanups-166f5e7e894c

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