netdev - Re: [PATCH 30/32] aio: add delayed cancel support

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Message-ID: <20180115085416.GC32532@lst.de>
Date:   Mon, 15 Jan 2018 09:54:16 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jeff Moyer <jmoyer@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, viro@...iv.linux.org.uk,
        Avi Kivity <avi@...lladb.com>, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 30/32] aio: add delayed cancel support

On Thu, Jan 11, 2018 at 10:27:05AM -0500, Jeff Moyer wrote:
> Duh, good point.  My main concern is that things like usb gadget will
> have to deal with races between cancellation and completion on their
> own.  It would be nice if we had infrastructure for them to use.  I'll
> have a look through that code to see if there's something we could or
> should be doing.

The current cancel interface is a bit of a mess, as it assumes the
kiocb is embedded into an aio_kiocb.  I think it would need a major
rework in general, but I'll need to fix a couple other aio issues
first.