From: Doug Ledford <dledford@redhat.com>
To: Ming Zhang <mingz@ele.uri.edu>
Cc: "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: Re: Re: about scsi_hostlist
Date: Sun, 17 Nov 2002 17:58:07 -0500 [thread overview]
Message-ID: <20021117225807.GK3280@redhat.com> (raw)
In-Reply-To: <200211172237.gAHMbF99022232@leviathan.ele.uri.edu>
On Sun, Nov 17, 2002 at 05:35:52PM -0500, Ming Zhang wrote: > Hi, Doug > >
For example, like the iSCSI target code, when it start, it should find all
SCSI disks or tapes link in order to export to client side. It need the
scsi_device pointer in order to send requests to it. That is why I need
it. Is there a formal way to find a scsi_device pointer by its lun, host
id, ... or by block layer major number and minor number?
There is a process by which it can be found, but it's too long to do on
each command. That means you need to hold a pointer to the device open
to make this not be a performance slug. What are you doing to hold a
refcount on the devices you grab the pointer for so that they don't get
freed without you knowing it?
P.S. - Enabling word wrap in your mailer would be most appreciated.
--
Doug Ledford <dledford@redhat.com> 919-754-3700 x44233
Red Hat, Inc.
1801 Varsity Dr.
Raleigh, NC 27606
next prev parent reply other threads:[~2002-11-17 22:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-17 22:35 Re: about scsi_hostlist Ming Zhang
2002-11-17 22:41 ` Christoph Hellwig
2002-11-17 22:58 ` Doug Ledford [this message]
2002-11-18 5:09 ` Oliver Xymoron
-- strict thread matches above, loose matches on Subject: below --
2002-11-17 22:43 Ming Zhang
2002-11-17 23:03 Ming Zhang
2002-11-17 23:48 ` Alan Cox
2002-11-18 5:13 ` Oliver Xymoron
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