linux-kernel - Re: [PATCH v2 01/12] fs-verity: add a documentation file

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Message-ID: <20181214053905.GA710@sol.localdomain>
Date:   Thu, 13 Dec 2018 21:39:06 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Christoph Hellwig <hch@...radead.org>,
        linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Victor Hsieh <victorhsieh@...gle.com>,
        Chandan Rajendra <chandan@...ux.vnet.ibm.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 01/12] fs-verity: add a documentation file

On Fri, Dec 14, 2018 at 12:17:22AM -0500, Theodore Y. Ts'o wrote:
> Furthermore, it would require extra complexity in the common fsverity code
> --- which looks for the Merkle tree at the end of file data --- for no real
> benefit.

To clarify, while this is technically true currently, as I mentioned it's been
kept flexible enough such that a filesystem *could* store the metadata elsewhere
with only some slight changes to the common fs/verity/ code which won't break
other filesystems.  Though of course, keeping all filesystems using the
"metadata after EOF" approach does allow a couple simplifications.

- Eric