linux-ext4 - Re: [PATCH v2 19/23] xfs: disable direct read path for fs-verity sealed files

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Message-ID: <ZC2YsgYRsvBejGYY@infradead.org>
Date:   Wed, 5 Apr 2023 08:50:10 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Andrey Albershteyn <aalbersh@...hat.com>, dchinner@...hat.com,
        ebiggers@...nel.org, hch@...radead.org, linux-xfs@...r.kernel.org,
        fsverity@...ts.linux.dev, rpeterso@...hat.com, agruenba@...hat.com,
        xiang@...nel.org, chao@...nel.org,
        damien.lemoal@...nsource.wdc.com, jth@...nel.org,
        linux-erofs@...ts.ozlabs.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        cluster-devel@...hat.com
Subject: Re: [PATCH v2 19/23] xfs: disable direct read path for fs-verity
 sealed files

On Wed, Apr 05, 2023 at 08:09:27AM -0700, Darrick J. Wong wrote:
> Thinking about this a little more -- I suppose we shouldn't just go
> breaking directio reads from a verity file if we can help it.  Is there
> a way to ask fsverity to perform its validation against some arbitrary
> memory buffer that happens to be fs-block aligned?

That would be my preference as well.  But maybe Eric know a good reason
why this hasn't been done yet.