From: Oliver Neukum <oliver@neukum.org>
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: linux-scsi@vger.kernel.org
Subject: Re: question on flushing buffers and spinning down disk
Date: Tue, 18 Sep 2007 16:15:46 +0200 [thread overview]
Message-ID: <200709181615.46537.oliver@neukum.org> (raw)
In-Reply-To: <1190124061.3375.5.camel@localhost.localdomain>
Am Dienstag 18 September 2007 schrieb James Bottomley:
> On Tue, 2007-09-18 at 10:32 +0200, Oliver Neukum wrote:
> > which function should a lldd call to make the scsi layer flush
> > a device's buffers and spin it down? Which kind of locking is
> > required?
>
> Depends on the context. Is this for suspend? If so it's done
> automatically by the sd driver, but the device has to be marked for it
> in the manage_start_stop attributes.
It is for runtime power management. We've gotten a bug report about
a drive enclosure that doesn't properly park heads if the usb device is
simply suspended. Apparently it simply cuts power so the cache can
be lost, too.
Regards
Oliver
next prev parent reply other threads:[~2007-09-18 14:15 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-18 8:32 question on flushing buffers and spinning down disk Oliver Neukum
2007-09-18 14:01 ` James Bottomley
2007-09-18 14:15 ` Oliver Neukum [this message]
2007-09-18 14:26 ` James Bottomley
2007-09-24 10:33 ` Oliver Neukum
2007-09-24 14:38 ` Alan Stern
2007-09-24 15:21 ` Oliver Neukum
2007-09-24 15:34 ` Alan Stern
2007-09-24 16:47 ` Oliver Neukum
2007-09-24 17:10 ` Alan Stern
2007-09-24 19:16 ` [linux-usb-devel] " Oliver Neukum
2007-09-24 19:39 ` Alan Stern
2007-09-24 20:00 ` [linux-usb-devel] " Oliver Neukum
2007-09-25 14:13 ` Alan Stern
2007-09-25 15:11 ` Oliver Neukum
2007-09-28 4:27 ` Greg KH
2007-09-28 7:02 ` Oliver Neukum
2007-09-28 19:33 ` Greg KH
2007-09-25 7:50 ` Oliver Neukum
2007-09-25 15:03 ` Alan Stern
2007-09-27 11:40 ` Oliver Neukum
2007-09-27 16:01 ` Alan Stern
2007-09-27 18:12 ` Oliver Neukum
2007-09-27 19:07 ` [linux-usb-devel] " Alan Stern
2007-09-27 19:26 ` Oliver Neukum
2007-09-27 20:26 ` Alan Stern
2007-09-27 20:54 ` Steve Calfee
2007-09-27 21:16 ` Alan Stern
2007-09-27 21:37 ` U. George
2007-09-28 8:17 ` [linux-usb-devel] " Oliver Neukum
2007-09-28 15:01 ` Alan Stern
2007-09-28 8:22 ` [linux-usb-devel] " Oliver Neukum
2007-09-28 21:11 ` Alan Stern
2007-09-28 21:47 ` Oliver Neukum
2007-09-29 15:56 ` Alan Stern
2007-09-29 16:12 ` [linux-usb-devel] " Oliver Neukum
2007-09-28 9:04 ` Oliver Neukum
2007-09-28 15:07 ` Alan Stern
2007-09-28 21:33 ` [linux-usb-devel] " Oliver Neukum
2007-09-29 16:38 ` Alan Stern
2007-09-29 17:52 ` Oliver Neukum
2007-09-29 19:06 ` Alan Stern
2007-09-29 20:06 ` Oliver Neukum
2007-09-29 20:56 ` Alan Stern
2007-09-29 21:03 ` David Brownell
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=200709181615.46537.oliver@neukum.org \
--to=oliver@neukum.org \
--cc=James.Bottomley@steeleye.com \
--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