linux-ext4 - [PATCHv4 0/8]

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Message-ID: <20250827141258.63501-1-kbusch@meta.com>
Date: Wed, 27 Aug 2025 07:12:50 -0700
From: Keith Busch <kbusch@...a.com>
To: <linux-block@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
CC: <linux-xfs@...r.kernel.org>, <linux-ext4@...r.kernel.org>, <hch@....de>,
        <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>
Subject: [PATCHv4 0/8] 

From: Keith Busch <kbusch@...nel.org>

Previous version:

  https://lore.kernel.org/linux-block/20250819164922.640964-1-kbusch@meta.com/

This series removes the direct io requirement that io vector lengths
align to the logical block size. There are two primary benefits from
doing this:

  1. It allows user space more flexibility in what kind of io vectors
     are accepted, removing the need to bounce their data to specially
     aligned buffers.

  2. By moving the alignment checks to later when the segments are
     already being checked, we remove one more iov walk per IO, reducing
     CPU utilization and submission latency.

Same as previously, I've tested direct IO on raw block, xfs, ext4, and btrfs.

Changes from v3:

  - Added reviews

  - Code style and comment updates

Keith Busch (8):
  block: check for valid bio while splitting
  block: add size alignment to bio_iov_iter_get_pages
  block: align the bio after building it
  block: simplify direct io validity check
  iomap: simplify direct io validity check
  block: remove bdev_iter_is_aligned
  blk-integrity: use simpler alignment check
  iov_iter: remove iov_iter_is_aligned

 block/bio-integrity.c  |  4 +-
 block/bio.c            | 64 ++++++++++++++++++----------
 block/blk-map.c        |  2 +-
 block/blk-merge.c      | 21 ++++++++--
 block/fops.c           | 10 ++---
 fs/iomap/direct-io.c   |  5 +--
 include/linux/bio.h    | 13 ++++--
 include/linux/blkdev.h | 21 ++++++----
 include/linux/uio.h    |  2 -
 lib/iov_iter.c         | 95 ------------------------------------------
 10 files changed, 92 insertions(+), 145 deletions(-)

-- 
2.47.3