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Date:   Mon, 17 Feb 2020 05:17:52 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc:     linux-fsdevel@vger.kernel.org, hch@infradead.org,
        darrick.wong@oracle.com, Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: Re: [PATCH] iomap: return partial I/O count on error in direct I/O
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On Thu, Feb 13, 2020 at 01:25:03PM -0600, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@suse.com>
> 
> In case of a block device error, iomap code returns 0 as opposed to
> the amount of submitted I/O, which may have completed before the
> error occurred. Return the count of submitted I/O for correct
> accounting.

Haven't we traditionally failed direct I/O syscalls that don't fully
complete and never supported short writes (or reads)?