linux-ext4 - RFC: iomap write invalidation

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Message-Id: <20200713074633.875946-1-hch@lst.de>
Date:   Mon, 13 Jul 2020 09:46:31 +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: RFC: iomap write invalidation

Hi all,

this series has two parts:  the first one picks up Dave's patch to avoid
invalidation entierly for reads, picked up deep down from the btrfs iomap
thread.  The second one falls back to buffered writes if invalidation fails
instead of leaving a stale cache around.  Let me know what you think about
this approch.