linux-kernel - Re: [PATCH] aio: Support read/write with non-iter file-ops

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Date:   Fri, 19 Jul 2019 00:17:52 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Benjamin LaHaise <bcrl@...ck.org>, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] aio: Support read/write with non-iter file-ops

On Thu, Jul 18, 2019 at 04:10:54PM -0700, Bjorn Andersson wrote:
> Implement a wrapper for aio_read()/write() to allow async IO on files
> not implementing the iter version of read/write, such as sysfs. This
> mimics how readv/writev uses non-iter ops in do_loop_readv_writev().

IDGI.  How would that IO manage to be async?  And what's the point
using aio in such situations in the first place?