linux-kernel - [PATCH 0/6] ext4: Add atomic write support for DIO

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: <cover.1729825985.git.ritesh.list@gmail.com>
Date: Fri, 25 Oct 2024 09:15:49 +0530
From: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>,
	Jan Kara <jack@...e.cz>,
	"Darrick J . Wong" <djwong@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	John Garry <john.g.garry@...cle.com>,
	Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	"Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Subject: [PATCH 0/6] ext4: Add atomic write support for DIO

This series adds the base feature support to enable atomic writes in
direct-io path for ext4. We advertise the minimum and the maximum atomic
write unit sizes via statx on a regular file.

This series allows users to utilize atomic write support using -
1. on bs < ps systems via - mkfs.ext4 -F -b 16384 /dev/sda
2. on bs = ps systems via bigalloc - mkfs.ext4 -O bigalloc -F -b 4096 -C 65536 /dev/sda

This can then be utilized using -
	xfs_io -fdc "pwrite -V 1 -A -b16k 0 16k" /mnt/f1

This is built on top of John's DIO atomic write series for XFS [1].
The VFS and block layer enablement for atomic writes were merged already.

[1]: https://lore.kernel.org/linux-xfs/20241019125113.369994-1-john.g.garry@oracle.com/

RFC -> PATCH:
- Dropped RFC tag
- Last RFC was posted a while ago but back then a lot of VFS and block layer
  interfaces were still not merged. Those are now merged, thanks to John and
  everyone else.
- [RFC] - https://lore.kernel.org/linux-ext4/cover.1709356594.git.ritesh.list@gmail.com/

Ritesh Harjani (IBM) (6):
  ext4: Add statx support for atomic writes
  ext4: Check for atomic writes support in write iter
  ext4: Support setting FMODE_CAN_ATOMIC_WRITE
  ext4: Warn if we ever fallback to buffered-io for DIO atomic writes
  iomap: Lift blocksize restriction on atomic writes
  ext4: Add atomic write support for bigalloc

 fs/ext4/ext4.h       | 14 +++++++++++++-
 fs/ext4/file.c       | 27 ++++++++++++++++++++++++++-
 fs/ext4/inode.c      | 27 +++++++++++++++++++++++++++
 fs/ext4/super.c      | 37 +++++++++++++++++++++++++++++++++++++
 fs/iomap/direct-io.c |  2 +-
 5 files changed, 104 insertions(+), 3 deletions(-)

--
2.46.0