Re: [PATCH v3] fstests: generic: add a test case to check fsverity reads

[Eric Biggers <ebiggers@kernel.org>]

On Fri, Oct 16, 2026 at 06:35:05PM +1030, Qu Wenruo wrote:
> 
> 
> 在 2026/10/16 18:17, Eric Biggers 写道:
> > On Mon, Oct 12, 2026 at 08:56:13AM +1030, Qu Wenruo wrote:
> > > +_fixed_by_fs_commit btrfs xxxxxxxxxxxx \
> > > +	"btrfs: fix the fsverity callback where unexpected range is verified"
> > 
> > Even without that commit, 'kvm-xfstests -c btrfs generic/807' still
> > passes.  Under what circumstances will this test fail?
> 
> It need as least 7.2 upstream, which enables large data folios for btrfs by
> default.
> 
> And I can always reproduce it here, mind to provide more info about the
> passed run?

This is on the latest mainline (2f2f7eeef8b0).  Not sure what else
you're looking for.

> > > +# Read the file, unpatched btrfs will verify blocks outside the read range and
> > > +# trigger fs-verity warnings.
> > > +# But the read itself should still be fine, as the failed part will be retried.
> > > +cat "$SCRATCH_MNT/foobar" > /dev/null
> > 
> > How about using md5sum and putting the expected value in the .out file,
> > so the contents are validated too?
> 
> That won't catch the problem.

I know, but it might as well be checked too.

- Eric