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

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Message-ID: <20230405221454.GQ3223426@dread.disaster.area>
Date:   Thu, 6 Apr 2023 08:14:54 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Andrey Albershteyn <aalbersh@...hat.com>, dchinner@...hat.com,
        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 06:02:47PM +0000, Eric Biggers wrote:
> And I really hope that you don't want to do DIO to the *Merkle tree*, as that

Not for XFS - the merkle tree is not held as file data.

That said, the merkle tree in XFS is not page cache or block aligned
metadata either, so we really want the same memory buffer based
interface for the merkle tree reading so that the merkle tree code
can read directly from the xfs-buf rather than requiring us to copy
it out of the xfsbuf into temporary pages...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com