From: James Bottomley <James.Bottomley@SteelEye.com>
To: "Ju, Seokmann" <Seokmann.Ju@lsil.com>
Cc: linux-scsi <linux-scsi@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Question: where should the SCSI driver place MODE_SENSE data ?
Date: Tue, 21 Mar 2006 17:01:39 -0600 [thread overview]
Message-ID: <1142982099.3428.37.camel@mulgrave.il.steeleye.com> (raw)
In-Reply-To: <9738BCBE884FDB42801FAD8A7769C265142114@NAMAIL1.ad.lsil.com>
On Tue, 2006-03-21 at 09:44 -0700, Ju, Seokmann wrote:
> In the 2.6 (2.6.9 and scsi-misc in git) kernel, MODE_SENSE SCSI command
> packet (scsi_cmnd) carries following entries with unexpectedly small in
> size.
> - request_bufflen
> - bufflen
>
> Especially for MODE SENSE with page code 8 (caching page), driver has
> minumum 12 Bytes MODE_SENSE data to deliver besides 'mode parameter
> header' and 'block descriptors'.
> When I dump those entries, they both are 4 Bytes in size.
> To me, it seems like that SCSI mid layer allocated 512 Bytes for
> MODE_SENSE data buffer, but the buffer length passed down to LLD
> incorrectly.
I don't understand the question. Are you asking why
sd_read_write_protect_flag and sd_read_cache_type operate in the way
they do? i.e. header first then actual data.
James
next prev parent reply other threads:[~2006-03-21 23:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-21 16:44 Ju, Seokmann
2006-03-21 23:01 ` James Bottomley [this message]
2006-03-21 22:43 Ju, Seokmann
2006-03-22 15:52 Ju, Seokmann
2006-03-22 16:14 ` James Bottomley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1142982099.3428.37.camel@mulgrave.il.steeleye.com \
--to=james.bottomley@steeleye.com \
--cc=Seokmann.Ju@lsil.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®