linux-ext4 - iomap write invalidation v2

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Message-Id: <20200721183157.202276-1-hch@lst.de>
Date:   Tue, 21 Jul 2020 20:31:54 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dave Chinner <david@...morbit.com>,
        Goldwyn Rodrigues <rgoldwyn@...e.de>
Cc:     Damien Le Moal <damien.lemoal@....com>,
        Naohiro Aota <naohiro.aota@....com>,
        Johannes Thumshirn <jth@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        cluster-devel@...hat.com, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: iomap write invalidation v2



Changes since v1:
 - use -ENOTBLK for the direct to buffered I/O fallback everywhere
 - document the choice of -ENOTBLK better
 - update a comment in XFS