kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00
Code Issues Releases Packages Activity

iomap: decouple simple direct I/O reads from iomap_dio_rw

Browse source 
The pending iomap_iter_next conversion creates performance issues for the
new simple direct I/O read fast path, because it assumes a model where
the iterator must be advanced at the end, which the direct I/O read fast
path tries to avoid.

Side step this by splitting the simple path from iomap_dio_rw, and
require the file systems to call into it explicitly, and pass only a
->begin callback.  This allows to drop various checks for incompatible
features while creating a requirement for the file system to only call
the simple path for cases that it can handle.

As a side-benefit we can now inline the initial part of the simple
direct I/O read fast path and let the compiler convert the indirect call
to ->begin into a direct call.

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Fengnan Chang <changfengnan@bytedance.com>
Reviewed-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260729192737.3190206-4-joannelkoong@gmail.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig 2026-07-29 12:27:18 -07:00 • committed by Christian Brauner
commit 335d4b6201
No known key found for this signature in database
GPG key ID: 91C61BC06578DCA2
8 changed files with 136 additions and 167 deletions
Download patch file Download diff file Expand all files Collapse all files