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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>,
	"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: Fri, 25 Mar 2016 09:01:25 +0000	[thread overview]
Message-ID: <8C7CC1D0-2835-4791-8215-C3A5F1B0995C@alex.org.uk> (raw)
In-Reply-To: <20160325084929.GA2671@grep.be>


On 25 Mar 2016, at 08:49, Wouter Verhelst <w@uter.be> wrote:

> Yes. This has been discussed on the nbd-general list in the past. There
> is also the (significant) problem of the server having maybe already
> sent out the header before discovering there is an error, at which point
> it can *only* drop the connection.

Indeed.

I think where we got to last time this was discussed was that the
server could have the option of returning 'chunks' of reply, each
chunk either being a {length, data} tuple, or an error. The total
data transmitted would add up to the full length if there is no
error.

>> I could write up a negotiation of global flags for structured reply
>> lengths as an extension proposal, if you think it is worth it.
> 
> I think it is worth it...

+1 - for NBD_CMD_READ too

-- 
Alex Bligh

  reply	other threads:[~2016-03-25  9:01 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
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 [this message]
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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