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

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Date:   Wed, 10 Jan 2018 18:26:39 -0500
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     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

Jeff Moyer <jmoyer@...hat.com> writes:

> Christoph Hellwig <hch@....de> writes:
>
>> The upcoming aio poll support would like to be able to complete the
>> iocb inline from the cancellation context, but that would cause
>> a lock order reversal.  Add support for optionally moving the cancelation
>> outside the context lock to avoid this reversal.
>>
>> Signed-off-by: Christoph Hellwig <hch@....de>
>
> Acked-by: Jeff Moyer <jmoyer@...hat.com>

Actually, let's move these two defines:

#define AIO_IOCB_DELAYED_CANCEL (1 << 0)
#define AIO_IOCB_CANCELLED      (1 << 1)

to include/linux/aio.h so that drivers outside of fs/aio.c can make use
of them.

-Jeff