linux-ext4 - Could we get an IOCB_NO_READ

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Message-ID: <2315872.1631874463@warthog.procyon.org.uk>
Date:   Fri, 17 Sep 2021 11:27:43 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
cc:     dhowells@...hat.com, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Could we get an IOCB_NO_READ_HOLE?

Hi Christoph,

Would it be possible to get an IOCB_NO_READ_HOLE flag that causes a read to
either fail entirely if there's a hole in the file or to stop at the hole,
possibly returning -ENODATA if the hole is at the front of the file?

Looking at iomap_dio_iter(), IOMAP_HOLE should be enabled in
iomap_iter::iomap.type for this?  Is it that simple?

David