linux-ext4 - Re: [PATCH 0/5] ext4: direct IO via iomap infrastructure

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Date:   Thu, 29 Aug 2019 07:41:04 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Bobrowski <mbobrowski@...browski.org>
Cc:     Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Ritesh Harjani <riteshh@...ux.ibm.com>,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, aneesh.kumar@...ux.ibm.com
Subject: Re: [PATCH 0/5] ext4: direct IO via iomap infrastructure

On Thu, Aug 29, 2019 at 09:20:50PM +1000, Matthew Bobrowski wrote:
> Uh ha! So, we conclude that there's no need to muck around with hairy
> ioend's, or the need to denote whether there's unwritten extents held
> against the inode using tricky state flag for that matter.

So in XFS we never had the i_unwritten counter, that is something
purely ext4 specific, and I can't really help with that unfortunately,
but maybe the people who implemented it might be able to help on that
one.