From: Paolo Bonzini <pbonzini@redhat.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Bart Van Assche <bvanassche@acm.org>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 1/2] virtio-scsi: fix parsing of hotplug/hot-unplug LUN number
Date: Thu, 26 Jul 2012 12:43:56 +0200 [thread overview]
Message-ID: <50111F6C.7010502@redhat.com> (raw)
In-Reply-To: <1343298798.3115.31.camel@dabdike>
Il 26/07/2012 12:33, James Bottomley ha scritto:
>> > Has it already been considered to modify scsilun_to_int() such that LUN
>> > numbers start at zero even for addressing method 1 ? This is what e.g.
>> > the function scst_unpack_lun() already does. See also
>> > http://scst.svn.sourceforge.net/viewvc/scst/trunk/scst/src/scst_lib.c?revision=HEAD&view=markup.
> Yes, as I said before, the problem is that the actual numbers are
>
> 1. not 1:1: there are several possible encodings of luns 0-255
> 2. hierarchical, so once you go beyond a single level you can't properly
> use a numeric representation either.
>
> the mid layer just uses the lun number as an encoding of the actual SAM
> lun. The key for us is that int_to_scsilun has to go back the other
> way.
I still disagree, but I will modify QEMU so that this patch is not
necessary. Later I can switch to int_to_scsilun.
Paolo
next prev parent reply other threads:[~2012-07-26 10:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-16 16:05 [PATCH 0/2] virtio-scsi event changes for 3.6 Paolo Bonzini
2012-07-16 16:05 ` [PATCH 1/2] virtio-scsi: fix parsing of hotplug/hot-unplug LUN number Paolo Bonzini
2012-07-26 8:52 ` James Bottomley
2012-07-26 9:04 ` Paolo Bonzini
2012-07-26 9:21 ` James Bottomley
2012-07-26 9:27 ` Paolo Bonzini
2012-07-26 9:41 ` James Bottomley
2012-07-26 9:58 ` Paolo Bonzini
2012-07-26 10:17 ` Bart Van Assche
2012-07-26 10:33 ` James Bottomley
2012-07-26 10:43 ` Paolo Bonzini [this message]
2012-07-26 11:31 ` James Bottomley
2012-07-16 16:05 ` [PATCH 2/2] virtio-scsi: support online resizing of disks Paolo Bonzini
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