linux-ext4 - fsverity optimzations and speedups

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: <20260119062250.3998674-1-hch@lst.de>
Date: Mon, 19 Jan 2026 07:22:41 +0100
From: Christoph Hellwig <hch@....de>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	David Sterba <dsterba@...e.com>,
	"Theodore Ts'o" <tytso@....edu>,
	Jaegeuk Kim <jaegeuk@...nel.org>,
	Chao Yu <chao@...nel.org>,
	Andrey Albershteyn <aalbersh@...hat.com>,
	linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	fsverity@...ts.linux.dev
Subject: fsverity optimzations and speedups

Hi all,

this series has a hodge podge of fsverity enhances that I looked into as
part of the review of the xfs fsverity support series.

The first three patches call fsverity code from VFS code instead of
requiring a lot of boilerplate in the file systems.  The first fixes a
bug in btrfs as part of that, as btrfs was missing a check.  An xfstests
test case for this will be sent separately.

Patch 4 removes the need to have a pointer to the fsverity_info in the
inode structure and uses a global resizable hash table instead.

Patch 5 passes down the struct file in the write path.

Patch 6 optimizes the fsvvrity read path by kicking off readahead for the
fsverity hashes from the data read submission context, which in my
simply testing showed huge benefits for sequential reads using dd.
I haven't been able to get fio to run on a preallocated fio file, but
I expect random read benefits would be significantly better than that
still.

Diffstat:
 fs/attr.c                    |   12 +++
 fs/btrfs/btrfs_inode.h       |    4 -
 fs/btrfs/file.c              |    6 -
 fs/btrfs/inode.c             |   13 ---
 fs/btrfs/verity.c            |   11 +--
 fs/ext4/ext4.h               |    4 -
 fs/ext4/file.c               |    4 -
 fs/ext4/inode.c              |    4 -
 fs/ext4/readpage.c           |    4 +
 fs/ext4/super.c              |    4 -
 fs/ext4/verity.c             |   34 ++++-----
 fs/f2fs/data.c               |    4 +
 fs/f2fs/f2fs.h               |    3 
 fs/f2fs/file.c               |    8 --
 fs/f2fs/inode.c              |    1 
 fs/f2fs/super.c              |    3 
 fs/f2fs/verity.c             |   34 ++++-----
 fs/inode.c                   |    9 ++
 fs/open.c                    |    8 +-
 fs/verity/enable.c           |   39 ++++++-----
 fs/verity/fsverity_private.h |   17 ++--
 fs/verity/open.c             |   90 ++++++++++++++-----------
 fs/verity/read_metadata.c    |   10 +-
 fs/verity/verify.c           |   98 +++++++++++++++++++--------
 include/linux/fsverity.h     |  152 +++++++++----------------------------------
 25 files changed, 262 insertions(+), 314 deletions(-)