linux-kernel - [PATCH 0/7] direct-io: even more flexible io vectors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250801234736.1913170-1-kbusch@meta.com>
Date: Fri, 1 Aug 2025 16:47:29 -0700
From: Keith Busch <kbusch@...a.com>
To: <linux-block@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <snitzer@...nel.org>, <axboe@...nel.dk>, <dw@...idwei.uk>,
        <brauner@...nel.org>, Keith Busch <kbusch@...nel.org>
Subject: [PATCH 0/7] direct-io: even more flexible io vectors

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

In furthering direct IO use from user space buffers without bouncing to
align to unnecessary kernel software constraints, this series removes
the requirement that io vector lengths align to the logical block size.
The downside (if want to call it that) is that mis-aligned io vectors
are caught further down the block stack rather than closer to the
syscall.

This change also removes one walking of the io vector, so that's nice
too.

Keith Busch (7):
  block: check for valid bio while splitting
  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            | 58 +++++++++++++++++---------
 block/blk-merge.c      |  5 +++
 block/fops.c           |  4 +-
 fs/iomap/direct-io.c   |  3 +-
 include/linux/blkdev.h |  7 ----
 include/linux/uio.h    |  2 -
 lib/iov_iter.c         | 95 ------------------------------------------
 8 files changed, 49 insertions(+), 129 deletions(-)

-- 
2.47.3