From: Matthew Wilcox <matthew@wil.cx>
To: Mike Christie <michaelc@cs.wisc.edu>
Cc: linux-scsi@vger.kernel.org
Subject: Re: [RFC] Asynchronous scsi scanning
Date: Thu, 11 May 2006 12:56:02 -0600 [thread overview]
Message-ID: <20060511185602.GL12272@parisc-linux.org> (raw)
In-Reply-To: <44638736.70708@cs.wisc.edu>
On Thu, May 11, 2006 at 01:49:26PM -0500, Mike Christie wrote:
> > 2) Unless it's serialised (in which case it still takes two hours to
> > boot), you lose drive numbering.
>
> Drive numbering refers to the bus, target numbering right?
No, I mean sda, sdb, sdc, etc.
> Currently
> when you scan a host you are serialized at the host level because of the
> host->scan_mutex aren't we? So for each host addition hotplug event you
> can scan that host with the command above, and then you can scan all
> your hosts in parallel and the drive numbering is not affected is it? I
> thought, your patch is basically creating a kernel thread and running
> scan host selected, which grabs the scan_mutex, with all wild cards.
> What I suggested ends up calling scan host selected with all wild cards
> but from userspace.
The trick is to avoid adding the sdevs to sysfs until all prior sdevs
have been added. I don't see a good way to do that from userspace.
next prev parent reply other threads:[~2006-05-11 18:56 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-11 14:33 [RFC] Asynchronous scsi scanning Matthew Wilcox
2006-05-11 18:15 ` Mike Christie
2006-05-11 18:21 ` Matthew Wilcox
2006-05-11 18:49 ` Mike Christie
2006-05-11 18:56 ` Matthew Wilcox [this message]
2006-05-11 19:09 ` Mike Christie
2006-05-18 17:22 ` [PATCH] " Matthew Wilcox
2006-05-29 3:19 ` Asynchronous scsi scanning, version 9 Matthew Wilcox
2006-05-29 8:38 ` Stefan Richter
2006-05-29 13:05 ` Matthew Wilcox
2006-05-29 13:11 ` Arjan van de Ven
2006-05-29 13:19 ` Matthew Wilcox
2006-05-31 23:21 ` Patrick Mansfield
2006-06-01 12:22 ` Kay Sievers
2006-10-26 19:53 ` maximilian attems
2006-06-01 13:14 ` Alexander E. Patrakov
2006-06-01 13:21 ` maximilian attems
2006-06-01 13:23 ` Matthew Wilcox
2006-06-01 13:26 ` Alexander E. Patrakov
2006-06-01 14:00 ` Arjan van de Ven
2006-06-25 21:15 ` James Bottomley
2006-06-25 22:46 ` Matthew Wilcox
2006-06-26 8:24 ` Arjan van de Ven
2006-06-26 12:40 ` Matthew Wilcox
2006-06-26 12:59 ` Arjan van de Ven
2006-06-26 16:03 ` Greg KH
2006-06-26 14:44 ` Matthew Dharm
2006-06-26 15:18 ` Matthew Wilcox
2006-06-26 15:44 ` James Bottomley
2006-06-26 16:02 ` Greg KH
2006-06-26 21:08 ` Matthew Dharm
2006-06-26 22:15 ` Matthew Wilcox
2006-06-26 18:55 ` [SPAM] " Doug Ledford
2006-06-26 21:04 ` Matthew Dharm
2006-06-26 21:20 ` Doug Ledford
2006-06-26 20:58 ` Linas Vepstas
2006-06-26 21:14 ` James Bottomley
2006-06-26 21:21 ` Linas Vepstas
2006-06-26 21:41 ` James Bottomley
2006-06-28 7:52 ` Hannes Reinecke
2006-06-28 16:03 ` James Bottomley
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