From: Jens Axboe <axboe@kernel.dk>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-block@vger.kernel.org, linux-aio@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 3/5] aio: add iocb->ki_blk_qc field
Date: Sun, 18 Nov 2018 19:59:28 -0700 [thread overview]
Message-ID: <031c304e-1b15-6a4a-b286-2d044f4c7faf@kernel.dk> (raw)
In-Reply-To: <20181119015921.GQ6311@dastard>
On 11/18/18 6:59 PM, Dave Chinner wrote:
> On Sat, Nov 17, 2018 at 04:53:15PM -0700, Jens Axboe wrote:
>> Add the field and have the blockdev direct_IO() helpers set it.
>> This is in preparation for being able to poll for iocb completion.
>
> What purpose does this field serve?
It's for later lookup to find the queue to poll on.
> And why add it to just blockdev direct_IO and not the other direct
> IO paths, too?
Only block devices support polling.
--
Jens Axboe
next prev parent reply other threads:[~2018-11-19 13:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-17 23:53 [PATCHSET 0/5] Support for polled aio Jens Axboe
2018-11-17 23:53 ` [PATCH 1/5] aio: use assigned completion handler Jens Axboe
2018-11-19 8:06 ` Christoph Hellwig
2018-11-17 23:53 ` [PATCH 2/5] aio: fix failure to put the file pointer Jens Axboe
2018-11-19 8:07 ` Christoph Hellwig
2018-11-19 15:39 ` Jens Axboe
2018-11-17 23:53 ` [PATCH 3/5] aio: add iocb->ki_blk_qc field Jens Axboe
2018-11-19 1:59 ` Dave Chinner
2018-11-19 2:59 ` Jens Axboe [this message]
2018-11-17 23:53 ` [PATCH 4/5] aio: support for IO polling Jens Axboe
2018-11-19 8:11 ` Christoph Hellwig
2018-11-19 13:32 ` Christoph Hellwig
2018-11-19 16:07 ` Jens Axboe
2018-11-17 23:53 ` [PATCH 5/5] aio: add support for file based polled IO Jens Axboe
2018-11-19 1:57 ` Dave Chinner
2018-11-19 2:58 ` Jens Axboe
2018-11-19 8:12 ` Christoph Hellwig
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