From: Paolo Bonzini <pbonzini@redhat.com>
To: Max Reitz <mreitz@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>
Cc: qemu-block@nongnu.org, qemu-devel@nongnu.org,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v2 0/3] block: Warn about usage of growing formats over non-growable protocols
Date: Wed, 06 May 2015 17:30:29 +0200 [thread overview]
Message-ID: <554A3395.7050509@redhat.com> (raw)
In-Reply-To: <554A1160.7020200@redhat.com>
On 06/05/2015 15:04, Max Reitz wrote:
>>
>> Introducing a warning for a normal QEMU invocation is a bit weird.
>>
>> What is the point of this series? Were users confused that they hit
>> ENOSPC?
>
> Users were confused when exporting a qcow2 image using nbd-server
> instead of qemu-img, and then accessing that NBD export with qemu
> (subsequently getting I/O errors on guest writes, if the image is not
> yet fully allocated): http://bugzilla.redhat.com/show_bug.cgi?id=1090713
I think NBD exports of non-raw images falls within the case of "user
should know what they're doing". In particular, you don't even need
metadata preallocation, you just need a "truncate -s10G file.qcow2"
before invoking nbd-server.
So I think it's not worth fixing this, even though I see how it can be a
minor UI/UX issue.
Paolo
next prev parent reply other threads:[~2015-05-06 15:30 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-19 19:03 [Qemu-devel] [PATCH v2 0/3] block: Warn about usage of growing formats over non-growable protocols Max Reitz
2015-03-19 19:03 ` [Qemu-devel] [PATCH v2 1/3] iotests: Make nested read in 072 and 089 read-only Max Reitz
2015-03-19 19:23 ` Eric Blake
2015-03-19 19:03 ` [Qemu-devel] [PATCH v2 2/3] block: Introduce BDS.growing Max Reitz
2015-03-19 20:11 ` Eric Blake
2015-03-19 19:03 ` [Qemu-devel] [PATCH v2 3/3] block: Introduce BlockDriver.requires_growing_file Max Reitz
2015-03-19 20:18 ` Eric Blake
2015-05-05 9:46 ` [Qemu-devel] [PATCH v2 0/3] block: Warn about usage of growing formats over non-growable protocols Stefan Hajnoczi
2015-05-06 13:04 ` Max Reitz
2015-05-06 15:30 ` Paolo Bonzini [this message]
2015-05-06 16:12 ` [Qemu-devel] [Qemu-block] " Max Reitz
2015-05-06 16:20 ` Paolo Bonzini
2015-05-06 16:37 ` Max Reitz
2015-05-06 16:47 ` Paolo Bonzini
2015-05-06 17:23 ` Max Reitz
2015-05-07 12:20 ` Paolo Bonzini
2015-05-07 12:29 ` Kevin Wolf
2015-05-07 12:47 ` Paolo Bonzini
2015-05-07 13:20 ` Kevin Wolf
2015-05-07 13:55 ` Paolo Bonzini
2015-05-07 14:07 ` Kevin Wolf
2015-05-07 14:16 ` Paolo Bonzini
2015-05-07 14:34 ` Kevin Wolf
2015-05-07 14:50 ` Paolo Bonzini
2015-05-08 10:08 ` Kevin Wolf
2015-05-08 10:16 ` Paolo Bonzini
2015-05-08 10:34 ` Kevin Wolf
2015-05-08 11:00 ` Paolo Bonzini
2015-05-08 12:58 ` Max Reitz
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