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From: Tejun Heo <tj@kernel.org>
To: Boaz Harrosh <bharrosh@panasas.com>
Cc: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>,
	Kiyoshi Ueda <k-ueda@ct.jp.nec.com>,
	device-mapper development <dm-devel@redhat.com>,
	linux-kernel@vger.kernel.org, Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH block#for-2.6.31] block: add request clone interface
Date: Wed, 17 Jun 2009 18:19:38 +0900	[thread overview]
Message-ID: <4A38B52A.5040304@kernel.org> (raw)
In-Reply-To: <4A2F66ED.80206@panasas.com>

Hello, Boaz.

Boaz Harrosh wrote:
> dst->buffer is always NULL in my path so I don't know
> what that is. Tejun?

Sorry about late reply.

It points to the head of the data buffer (bio) if the address is in
addressable range (actually gets bogus value if not) and is used
mostly by PIO-only drivers.  It's set in blk_rq_bio_prep(), gets
updated on merge and partial request completion.

Thanks.

-- 
tejun

WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Boaz Harrosh <bharrosh@panasas.com>
Cc: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>,
	Jens Axboe <jens.axboe@oracle.com>,
	linux-kernel@vger.kernel.org,
	device-mapper development <dm-devel@redhat.com>,
	"Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
Subject: Re: [PATCH block#for-2.6.31] block: add request clone interface
Date: Wed, 17 Jun 2009 18:19:38 +0900	[thread overview]
Message-ID: <4A38B52A.5040304@kernel.org> (raw)
In-Reply-To: <4A2F66ED.80206@panasas.com>

Hello, Boaz.

Boaz Harrosh wrote:
> dst->buffer is always NULL in my path so I don't know
> what that is. Tejun?

Sorry about late reply.

It points to the head of the data buffer (bio) if the address is in
addressable range (actually gets bogus value if not) and is used
mostly by PIO-only drivers.  It's set in blk_rq_bio_prep(), gets
updated on merge and partial request completion.

Thanks.

-- 
tejun

  parent reply	other threads:[~2009-06-17  9:19 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-09  7:51 [PATCH block#for-2.6.31] block: add request clone interface Kiyoshi Ueda
2009-06-09  7:51 ` Kiyoshi Ueda
2009-06-09 13:49 ` Boaz Harrosh
2009-06-09 13:49   ` Boaz Harrosh
2009-06-09 18:03 ` Jens Axboe
2009-06-10  2:15   ` Kiyoshi Ueda
2009-06-10  2:15     ` Kiyoshi Ueda
2009-06-10  4:30     ` Jens Axboe
2009-06-10  4:30       ` Jens Axboe
2009-06-11  3:17       ` Kiyoshi Ueda
2009-06-11  3:17         ` Kiyoshi Ueda
2009-06-11  9:20         ` Jens Axboe
2009-06-10  7:55     ` Boaz Harrosh
2009-06-10  7:55       ` Boaz Harrosh
2009-06-11  3:18       ` Kiyoshi Ueda
2009-06-11  3:18         ` Kiyoshi Ueda
2009-06-17  9:19       ` Tejun Heo [this message]
2009-06-17  9:19         ` Tejun Heo

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