From: James Bottomley <James.Bottomley@SteelEye.com>
To: Mike Christie <michaelc@cs.wisc.edu>
Cc: Boaz Harrosh <bharrosh@panasas.com>,
linux-scsi@vger.kernel.org, Jens Axboe <jens.axboe@oracle.com>,
Benny Halevy <bhalevy@panasas.com>
Subject: Re: Possible bug in scsi_lib.c:scsi_req_map_sg()
Date: Mon, 27 Nov 2006 18:33:49 -0500 [thread overview]
Message-ID: <1164670429.3245.17.camel@mulgrave.il.steeleye.com> (raw)
In-Reply-To: <456B38E9.6060209@cs.wisc.edu>
On Mon, 2006-11-27 at 13:13 -0600, Mike Christie wrote:
> I thought they were continguous. I think James has said before that
> they
> can be disjoint. When we converted sg it did not look like sg or st
> supported disjoint. The main non dio path used a buffer from
> get_free_pages so I thought that would always be contiguous. The dio
> path then always set the first sg offset, but the rest it set to zero.
For ordinary mappings, they're contiguous ... there's an edge case where
you go through the deprecated buffer cache you can end up with multiple
sg elements that are 512 bytes in length, but this probably isn't worth
worrying about any more.
James
next prev parent reply other threads:[~2006-11-27 23:34 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-27 17:44 Possible bug in scsi_lib.c:scsi_req_map_sg() Boaz Harrosh
2006-11-27 19:13 ` Mike Christie
2006-11-27 19:27 ` Mike Christie
2006-11-27 21:52 ` Kai Makisara
2006-11-28 18:57 ` Jens Axboe
2006-11-29 9:30 ` Benny Halevy
2007-03-02 16:45 ` Dachepalli, Sudhir
2007-03-02 21:19 ` Mike Christie
2007-03-02 21:59 ` Mike Christie
2007-03-02 23:45 ` Dachepalli, Sudhir
2007-03-04 0:04 ` Mike Christie
2007-03-04 7:36 ` Dachepalli, Sudhir
2007-03-04 14:31 ` James Bottomley
2007-03-04 15:43 ` Mike Christie
2007-03-04 15:57 ` James Bottomley
2007-03-04 16:21 ` Mike Christie
2007-03-04 16:51 ` James Bottomley
2007-03-04 17:04 ` Mike Christie
2007-03-04 17:07 ` Mike Christie
2007-03-04 18:00 ` Dachepalli, Sudhir
2007-03-04 18:14 ` James Bottomley
2007-03-04 19:06 ` Dachepalli, Sudhir
2007-03-05 13:00 ` Christoph Hellwig
2007-03-05 13:02 ` Christoph Hellwig
2006-11-27 23:33 ` James Bottomley [this message]
2006-11-28 15:44 ` Boaz Harrosh
2006-11-28 17:30 ` Mike Christie
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