From: Christoph Hellwig <hch@infradead.org>
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Mike Anderson <andmike@us.ibm.com>,
SCSI Mailing List <linux-scsi@vger.kernel.org>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [PATCH] make the SCSI mid-layer obey the device online flag
Date: Fri, 6 Jun 2003 07:36:03 +0100 [thread overview]
Message-ID: <20030606073603.A13259@infradead.org> (raw)
In-Reply-To: <1054754103.2360.8.camel@mulgrave>; from James.Bottomley@steeleye.com on Wed, Jun 04, 2003 at 03:14:56PM -0400
On Wed, Jun 04, 2003 at 03:14:56PM -0400, James Bottomley wrote:
> Yes, that's why I think forbidding *all* I/O after offlining is too much
> effort. Offlining should be a precursor to device destruction, but
> actual destruction probably relys on detaching the queue from the block
> device interface and sitting on it until all use counts drop to zero.
We need a way to disable _all_ I/O to a device due to the way the driver
model works. The driver model ->remove always is a surprise removal,
so the underlying PCI (or whatever) device for a scsi host can go away
anytime. Because of that we need to make damn sure no call to
->queuecommand will happen after scsi_remove_host is called. Whether
this is implemented with the same mechanisms as the current sdev->online
is another question.
next prev parent reply other threads:[~2003-06-06 6:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-04 16:01 [PATCH] make the SCSI mid-layer obey the device online flag James Bottomley
2003-06-04 16:51 ` Mike Anderson
2003-06-04 19:14 ` James Bottomley
2003-06-05 0:34 ` Patrick Mansfield
2003-06-05 12:59 ` James Bottomley
2003-06-05 13:41 ` Alan Stern
2003-06-06 6:36 ` Christoph Hellwig [this message]
2003-06-06 15:19 ` James Bottomley
2003-06-06 15:51 ` Oliver Neukum
2003-06-06 16:02 ` Luben Tuikov
2003-06-06 15:28 ` Luben Tuikov
2003-06-06 15:39 ` James Bottomley
2003-06-06 15:52 ` Luben Tuikov
2003-06-06 16:04 ` James Bottomley
2003-06-06 20:51 ` Christoph Hellwig
2003-06-06 23:27 ` Luben Tuikov
2003-06-06 23:43 ` James Bottomley
2003-06-07 5:20 ` Luben Tuikov
2003-06-06 20:23 ` Mike Anderson
2003-06-06 20:52 ` Christoph Hellwig
2003-06-10 0:00 ` Mike Anderson
2003-06-06 20:49 ` Christoph Hellwig
2003-06-06 23:21 ` Luben Tuikov
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