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From: Alex Bligh <alex@alex.org.uk>
To: Wouter Verhelst <w@uter.be>
Cc: "nbd-general@lists.sourceforge.net"
	<nbd-general@lists.sourceforge.net>,
	Kevin Wolf <kwolf@redhat.com>, Alex Bligh <alex@alex.org.uk>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	Pavel Borzenkov <pborzenkov@virtuozzo.com>,
	"Stefan stefanha@redhat. com" <stefanha@redhat.com>,
	"Denis V. Lunev" <den@openvz.org>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [Nbd] [PATCH 2/2] NBD proto: add GET_LBA_STATUS extension
Date: Thu, 24 Mar 2016 10:32:25 +0000	[thread overview]
Message-ID: <433C735B-1BAE-47DA-9543-2E5BA2710357@alex.org.uk> (raw)
In-Reply-To: <20160324093315.GA2870@grep.be>

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On 24 Mar 2016, at 09:33, Wouter Verhelst <w@uter.be> wrote:

> Now I'm not saying we
> need to fully define what it means for a part of the backend to be
> "dirty" or not.  It's okay to leave part of the meaning in the dark,
> leaving that implementation-defined.

Well, the 3 possible states are:

* unallocated
* zero
* non-zero

So the possible replies are a bitfield of those, with a '1' if it 'might'
be in that state, i.e.

111 = no idea
110 = might be zero or unallocated, but isn't zero
011 = I know it's allocated, but I don't know whether it is zero or not

And '000' is not permitted!

etc.


--
Alex Bligh





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  reply	other threads:[~2016-03-24 10:32 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-23 14:16 [Qemu-devel] [PATCH 0/2] NBD protocol extensions: WRITE_ZEROES and GET_LBA_STATUS Denis V. Lunev
2016-03-23 14:16 ` [Qemu-devel] [PATCH 1/2] NBD proto: add WRITE_ZEROES extension Denis V. Lunev
2016-03-23 15:14   ` Eric Blake
2016-03-23 17:40     ` [Qemu-devel] [Nbd] " Wouter Verhelst
2016-03-24  7:16     ` [Qemu-devel] " Pavel Borzenkov
2016-03-24  7:36       ` [Qemu-devel] [Nbd] " Wouter Verhelst
2016-03-23 17:21   ` Wouter Verhelst
2016-03-24  7:57     ` Pavel Borzenkov
2016-03-24  8:26       ` Wouter Verhelst
2016-03-24 11:35         ` Pavel Borzenkov
2016-03-24 11:37         ` Paolo Bonzini
2016-03-24 12:31           ` Wouter Verhelst
2016-03-24 14:53         ` Eric Blake
2016-03-23 14:16 ` [Qemu-devel] [PATCH 2/2] NBD proto: add GET_LBA_STATUS extension Denis V. Lunev
2016-03-23 16:27   ` Eric Blake
2016-03-24 12:30     ` Pavel Borzenkov
2016-03-24 15:04       ` Eric Blake
2016-03-24 16:36         ` Pavel Borzenkov
2016-03-23 17:58   ` [Qemu-devel] [Nbd] " Wouter Verhelst
2016-03-23 18:14     ` Kevin Wolf
2016-03-24  8:25       ` Pavel Borzenkov
2016-03-24  8:41         ` Wouter Verhelst
2016-03-24 11:36           ` Pavel Borzenkov
2016-03-24 12:32             ` Wouter Verhelst
2016-03-24  8:43     ` Pavel Borzenkov
2016-03-24  9:33       ` Wouter Verhelst
2016-03-24 10:32         ` Alex Bligh [this message]
2016-03-24 11:58           ` Paolo Bonzini
2016-03-24 12:17             ` Alex Bligh
2016-03-24 12:32               ` Paolo Bonzini
2016-03-24 13:31                 ` Alex Bligh
2016-03-24 13:32                   ` Paolo Bonzini
2016-03-24 11:55     ` Paolo Bonzini
2016-03-24 12:43       ` Wouter Verhelst
2016-03-24 15:25       ` Eric Blake
2016-03-24 15:33         ` Paolo Bonzini
2016-03-24 15:53           ` Wouter Verhelst
2016-03-24 16:04             ` Eric Blake
2016-03-24 16:07               ` Kevin Wolf
2016-03-24 16:47                 ` Wouter Verhelst
2016-03-29  9:38                   ` Kevin Wolf
2016-03-29  9:53                     ` Wouter Verhelst
2016-03-29 10:25                     ` Paolo Bonzini
2016-03-24 22:08   ` [Qemu-devel] " Eric Blake
2016-03-25  8:49     ` [Qemu-devel] [Nbd] " Wouter Verhelst
2016-03-25  9:01       ` Alex Bligh
2016-03-28 15:58       ` Eric Blake
2016-04-04 10:32         ` Markus Pargmann
2016-04-04 10:18       ` Markus Pargmann
2016-04-04 16:54         ` Eric Blake
2016-04-04 22:17         ` Wouter Verhelst
2016-04-04 16:40   ` [Qemu-devel] " Eric Blake
2016-04-04 20:16   ` Denis V. Lunev
2016-04-04 20:36     ` [Qemu-devel] [Nbd] " Eric Blake

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