linux-kernel - Re: [PATCH] mm/filemap: don't revert iter on -EIOCBQUEUED

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Message-ID: <20210111080535.GA693550@infradead.org>
Date:   Mon, 11 Jan 2021 08:05:35 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] mm/filemap: don't revert iter on -EIOCBQUEUED

On Sat, Jan 09, 2021 at 04:00:32PM +0000, Pavel Begunkov wrote:
> Currently, if I/O is enqueued for async execution direct paths of
> generic_file_{read,write}_iter() will always revert the iter. There are
> no users expecting that, and that is also costly. Leave iterators as is
> on -EIOCBQUEUED.

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>