linux-ext4 - Re: fsverity cleanups, speedup and memory usage optimization v4

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Message-ID: <20260129000702.GD2024@quark>
Date: Wed, 28 Jan 2026 16:07:02 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: Christoph Hellwig <hch@....de>
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>,
	Matthew Wilcox <willy@...radead.org>, 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: Re: fsverity cleanups, speedup and memory usage optimization v4

On Wed, Jan 28, 2026 at 04:26:12PM +0100, Christoph Hellwig wrote:
> 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 part calls fsverity code from VFS code instead of requiring
> boilerplate in the file systems.
> 
> The first patch fixes a bug in btrfs as part of that, as btrfs was missing
> a check.  An xfstests test case for this was submitted already.
> Can we expedite this fix?
> 
> The middle part optimizes the fsverity 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.

To get things going, I've applied patches 1-6 to
https://git.kernel.org/pub/scm/fs/fsverity/linux.git/log/?h=for-next

I couldn't go further, due to the bugs in patches 7 and 8.

- Eric