From: Christoph Hellwig <hch@lst.de>
To: "Nicholas A. Bellinger" <nab@linux-iscsi.org>
Cc: Christoph Hellwig <hch@infradead.org>,
target-devel <target-devel@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: [PATCH 3/3] target/iblock: Add WRITE_SAME w/ UNMAP=0 emulation support
Date: Thu, 15 Nov 2012 20:32:35 +0100 [thread overview]
Message-ID: <20121115193235.GA5714@lst.de> (raw)
In-Reply-To: <1353007786.4447.29.camel@haakon2.linux-iscsi.org>
On Thu, Nov 15, 2012 at 11:29:46AM -0800, Nicholas A. Bellinger wrote:
> Well at least for the latter that is because UNMAP=0 does not have a
> payload. ;)
UNMAP=0 does have a payload, we just ignore it. In fact I was told
that targets should check for a completely zeroed sector sized payload
for it if being pedantic. I can't really find the justification for
that in the standard - the closest thing to it is the stance about
ignoring the unmap bit if the device is fully provisioned.
next prev parent reply other threads:[~2012-11-15 19:32 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-08 20:07 [PATCH 0/3] target/iblock: Add WRITE_SAME w/ UNMAP=0 emulation Nicholas A. Bellinger
2012-11-08 20:07 ` [PATCH 1/3] target/sbc: Make WRITE_SAME check differentiate between UNMAP=[1,0] Nicholas A. Bellinger
2012-11-15 10:52 ` Christoph Hellwig
2012-11-08 20:07 ` [PATCH 2/3] target: Add max_write_same_len device attribute Nicholas A. Bellinger
2012-11-15 10:53 ` Christoph Hellwig
2012-11-15 19:23 ` Nicholas A. Bellinger
2012-11-16 13:05 ` Paolo Bonzini
2012-11-08 20:07 ` [PATCH 3/3] target/iblock: Add WRITE_SAME w/ UNMAP=0 emulation support Nicholas A. Bellinger
2012-11-15 11:04 ` Christoph Hellwig
2012-11-15 15:03 ` Douglas Gilbert
2012-11-15 15:25 ` Martin K. Petersen
2012-11-15 19:29 ` Nicholas A. Bellinger
2012-11-15 19:32 ` Christoph Hellwig [this message]
2012-11-15 20:01 ` Elliott, Robert (Server Storage)
2012-11-15 20:31 ` Nicholas A. Bellinger
2012-11-19 11:38 ` Paolo Bonzini
2012-11-19 23:19 ` Elliott, Robert (Server Storage)
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