linux-ext4 - Re: [PATCH v10 1/5] fscrypt: add functions for direct I/O support

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Date:   Thu, 20 Jan 2022 23:10:00 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     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-xfs@...r.kernel.org, Dave Chinner <david@...morbit.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Theodore Ts'o <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        Satya Tangirala <satyat@...gle.com>
Subject: Re: [PATCH v10 1/5] fscrypt: add functions for direct I/O support

On Thu, Jan 20, 2022 at 01:04:17AM -0800, Eric Biggers wrote:
> I actually had changed this from v9 because fscrypt_dio_supported() seemed
> backwards, given that its purpose is to check whether DIO is unsupported, not
> whether it's supported per se (and the function's comment reflected this).  What
> ext4 and f2fs do is check a list of reasons why DIO would *not* be supported,
> and if none apply, then it is supported.  This is just one of those reasons.
> 
> This is subjective though, so if people prefer the old way, I'll change it back.

I find non-negated API much better and would also help with undinwinding
the ext4/f2fs mess.  But I'm not going to block the series on such a
minor detail, of course.