From: hch@infradead.org (Christoph Hellwig)
Subject: [PATCH] NVMe: Create discard zero quirk white list
Date: Sat, 5 Mar 2016 22:20:37 -0800 [thread overview]
Message-ID: <20160306062037.GA15050@infradead.org> (raw)
In-Reply-To: <20160305223949.GD5530@linux.intel.com>
On Sat, Mar 05, 2016@05:39:49PM -0500, Matthew Wilcox wrote:
> > Meh, indeed:
> >
> > "If a read occurs to a deallocated range, the controller shall return
> > all zeros, all ones, or the last data written to the associated LBA."
> >
> > time to write a TP for a bit on the identify page..
>
> Since we have a WRITE ZEROES command, do we need this?
WRITE ZEROES has no way to request deallocating blocks. It's the moral
equivalent of a WRITE SAME without the unmap bit of all zeroes.
prev parent reply other threads:[~2016-03-06 6:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-04 17:45 [PATCH] NVMe: Create discard zero quirk white list Keith Busch
2016-03-04 18:04 ` Christoph Hellwig
2016-03-04 18:13 ` Keith Busch
2016-03-05 22:39 ` Matthew Wilcox
2016-03-06 6:20 ` Christoph Hellwig [this message]
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