From: Max Reitz <mreitz@redhat.com>
To: Alberto Garcia <berto@igalia.com>, qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
qemu-block@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat
Date: Fri, 11 Sep 2015 19:21:44 +0200 [thread overview]
Message-ID: <55F30DA8.4070502@redhat.com> (raw)
In-Reply-To: <1be64a26c9a89ff0af4c2b1299d6c8b58361644a.1441890725.git.berto@igalia.com>
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On 10.09.2015 15:39, Alberto Garcia wrote:
> If set to true, the image will be opened with the BDRV_O_NO_BACKING
> flag. This is useful for creating snapshots using images opened with
> blockdev-add, since they are not supposed to have a backing image
> before the operation.
>
> Signed-off-by: Alberto Garcia <berto@igalia.com>
> ---
> block.c | 5 +++++
> qapi/block-core.json | 6 +++++-
> 2 files changed, 10 insertions(+), 1 deletion(-)
Ignorant of any possible previous discussion that might have taken
place: The documentation for @backing says it may be set to the empty
string in order to achieve exactly that.
So why do we need the new flag? Because "backing: ''" is ugly?
Max
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next prev parent reply other threads:[~2015-09-11 17:21 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-10 13:39 [Qemu-devel] [PATCH v3 0/4] Add 'blockdev-snapshot' command Alberto Garcia
2015-09-10 13:39 ` [Qemu-devel] [PATCH v3 1/4] block: rename BlockdevSnapshot to BlockdevSnapshotSync Alberto Garcia
2015-09-11 17:15 ` Max Reitz
2015-09-10 13:39 ` [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat Alberto Garcia
2015-09-11 17:21 ` Max Reitz [this message]
2015-09-11 17:28 ` Kevin Wolf
2015-09-11 17:33 ` Max Reitz
2015-09-14 5:54 ` Alberto Garcia
2015-09-14 8:45 ` Kevin Wolf
2015-09-14 14:20 ` Alberto Garcia
2015-09-11 17:28 ` Eric Blake
2015-09-11 17:30 ` [Qemu-devel] [Qemu-block] " Eric Blake
2015-09-10 13:39 ` [Qemu-devel] [PATCH v3 3/4] block: add a 'blockdev-snapshot' QMP command Alberto Garcia
2015-09-11 17:58 ` Eric Blake
2015-09-14 14:08 ` Alberto Garcia
2015-09-11 18:11 ` Max Reitz
2015-09-10 13:39 ` [Qemu-devel] [PATCH v3 4/4] block: add tests for the 'blockdev-snapshot' command Alberto Garcia
2015-09-11 18:02 ` Eric Blake
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