From: David Miller <davem@davemloft.net>
To: rusty@rustcorp.com.au
Cc: fujita.tomonori@lab.ntt.co.jp, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org, jens.axboe@oracle.com,
dougg@torque.net
Subject: Re: [PATCH 0/5] sg_ring for scsi
Date: Thu, 20 Dec 2007 16:30:58 -0800 (PST) [thread overview]
Message-ID: <20071220.163058.185565456.davem@davemloft.net> (raw)
In-Reply-To: <200712211013.38511.rusty@rustcorp.com.au>
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Fri, 21 Dec 2007 10:13:38 +1100
> But, as demonstrated, there are real benefits of having an explicit header:
>
> 1) It removes the chain-end/explicit count ambiguity (see
> http://lkml.org/lkml/2007/10/25/209 & thread)
> 2) It allows others to manipulate sg chains, which couldn't be done before
> (eg. the ATA code which wants to append a padding element).
> 3) I can now hand you an sg ring for you to fill: sg chains can't do that.
>
> In short, sg_ring is generally useful primitive. sg chains are a clever hack
> for scsi_lib to create, and everyone else to read.
I do not refute any of this :-)
next prev parent reply other threads:[~2007-12-21 0:31 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-20 5:45 Rusty Russell
2007-12-20 5:48 ` [PATCH 1/5] sg_ring: sg_ring.h Rusty Russell
2007-12-20 5:49 ` [PATCH 2/5] dma_map_sg_ring() helper Rusty Russell
2007-12-20 5:50 ` [PATCH 3/5] blk_rq_map_sg_ring as a counterpart to blk_rq_map_sg Rusty Russell
2007-12-20 5:51 ` [PATCH 4/5] sg_ring: Convert core scsi code to sg_ring Rusty Russell
2007-12-20 5:53 ` [PATCH 5/5] sg_ring: Convert scsi_debug Rusty Russell
2007-12-20 7:06 ` [PATCH 2/5] dma_map_sg_ring() helper FUJITA Tomonori
2007-12-20 7:42 ` David Miller
2007-12-20 22:58 ` Rusty Russell
2007-12-21 0:00 ` FUJITA Tomonori
2007-12-21 0:35 ` Rusty Russell
2007-12-21 0:40 ` David Miller
2007-12-21 2:22 ` FUJITA Tomonori
2007-12-21 2:47 ` Rusty Russell
2007-12-20 7:07 ` [PATCH 0/5] sg_ring for scsi FUJITA Tomonori
2007-12-20 7:53 ` Rusty Russell
2007-12-20 7:58 ` David Miller
2007-12-20 7:58 ` Jens Axboe
2007-12-20 23:13 ` Rusty Russell
2007-12-21 0:30 ` David Miller [this message]
2007-12-21 2:28 ` FUJITA Tomonori
2007-12-21 3:26 ` Rusty Russell
2007-12-21 4:37 ` FUJITA Tomonori
2007-12-26 0:27 ` Rusty Russell
2007-12-27 2:09 ` FUJITA Tomonori
2007-12-27 11:52 ` Rusty Russell
2007-12-21 12:13 ` Herbert Xu
2007-12-20 7:58 ` Jens Axboe
2007-12-20 13:55 ` Boaz Harrosh
2007-12-20 14:00 ` [PATCH 1/3] SG: Move functions to lib/scatterlist.c and add sg chaining allocator helpers Boaz Harrosh
2007-12-20 14:21 ` Boaz Harrosh
2007-12-21 12:15 ` Herbert Xu
2007-12-20 14:03 ` [PATCH 2/3] SG: Convert SCSI to use scatterlist helpers for sg chaining Boaz Harrosh
2007-12-20 14:26 ` Boaz Harrosh
2007-12-20 14:06 ` [PATCH 3/3] SG: Update ide/ to use sg_table Boaz Harrosh
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