From: Mike Christie <mchristi@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: ceph-devel@vger.kernel.org, target-devel@vger.kernel.org
Subject: Re: [PATCH 01/18] libceph: add scatterlist messenger data type
Date: Wed, 29 Jul 2015 17:59:24 -0500 [thread overview]
Message-ID: <55B95ACC.2030306@redhat.com> (raw)
In-Reply-To: <20150729175515.GA16804@infradead.org>
On 07/29/2015 12:55 PM, Christoph Hellwig wrote:
> On Wed, Jul 29, 2015 at 04:23:38AM -0500, mchristi@redhat.com wrote:
>> From: Mike Christie <michaelc@cs.wisc.edu>
>>
>> LIO uses scatterlist for its page/data management. This patch
>> adds a scatterlist messenger data type, so LIO can pass its sg
>> down directly to rbd.
>
> Just as I mentioned for David's patches this is the wrong way to attack
> your problem. The block layer already supports WRITE SAME, and COMPARE
> and WRITE nees to be supported at that level too insted of creating
> artifical bypasses.
Why do I have to use the block layer? I just want to map the se_cmd to a
ceph request and then put it back on the wire. I don't think I need any
of the block layer services. We will do things like io scheduling on the
OSD side. We just want to use LIO as more of a passthrough.
next prev parent reply other threads:[~2015-07-29 22:59 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-29 9:23 [PATCH 01/18] libceph: add scatterlist messenger data type mchristi
2015-07-29 9:23 ` [PATCH 02/18] rbd: add support for scatterlist obj_request_type mchristi
2015-07-29 9:23 ` [PATCH 03/18] rbd: add lio specific data area mchristi
2015-07-29 9:23 ` [PATCH 04/18] libceph: support bidirectional requests mchristi
2015-11-21 23:32 ` Goldwyn Rodrigues
2015-07-29 9:23 ` [PATCH 05/18] libceph: add support for CMPEXT compare extent requests mchristi
2015-07-29 9:23 ` [PATCH 06/18] rbd: add write test helper mchristi
2015-07-29 9:23 ` [PATCH 07/18] rbd: add num ops calculator helper mchristi
2015-07-29 9:23 ` [PATCH 08/18] rbd: add support for COMPARE_AND_WRITE/CMPEXT mchristi
2015-07-29 9:23 ` [PATCH 09/18] libceph: add support for write same requests mchristi
2015-07-29 9:23 ` [PATCH 10/18] rbd: add support for writesame requests mchristi
2015-07-29 9:23 ` [PATCH 11/18] target: add compare and write callback mchristi
2015-07-29 9:23 ` [PATCH 12/18] target: compare and write backend driver sense handling mchristi
2015-09-04 19:41 ` Mike Christie
2015-09-04 22:34 ` Andy Grover
2015-09-06 6:38 ` Sagi Grimberg
2015-09-06 7:12 ` Christoph Hellwig
2015-07-29 9:23 ` [PATCH 13/18] target: add COMPARE_AND_WRITE sg creation helper mchristi
2015-07-29 9:23 ` [PATCH 14/18] libceph: fix pr_fmt compile issues mchristi
2015-07-29 9:23 ` [PATCH 15/18] rbd: export some functions used by lio rbd backend mchristi
2015-07-29 9:23 ` [PATCH 16/18] rbd: move structs used by lio rbd to new header mchristi
2015-07-29 9:23 ` [PATCH 17/18] target: add rbd backend mchristi
2015-07-29 14:27 ` Bart Van Assche
2015-07-29 17:07 ` Mike Christie
2015-07-29 9:23 ` [PATCH 18/18] target: add lio rbd to makefile/Kconfig mchristi
2015-07-29 13:34 ` [PATCH 01/18] libceph: add scatterlist messenger data type Alex Elder
2015-07-29 17:49 ` Mike Christie
2015-07-29 17:55 ` Christoph Hellwig
2015-07-29 22:59 ` Mike Christie [this message]
2015-07-29 23:40 ` Mike Christie
2015-07-30 7:34 ` Nicholas A. Bellinger
2015-07-30 14:55 ` Christoph Hellwig
2016-02-04 10:33 ` David Disseldorp
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