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Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to Blo
From: |
Max Reitz |
Subject: |
Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat |
Date: |
Fri, 11 Sep 2015 19:21:44 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
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 <address@hidden>
> ---
> 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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- [Qemu-devel] [PATCH v3 0/4] Add 'blockdev-snapshot' command, Alberto Garcia, 2015/09/10
- [Qemu-devel] [PATCH v3 1/4] block: rename BlockdevSnapshot to BlockdevSnapshotSync, Alberto Garcia, 2015/09/10
- [Qemu-devel] [PATCH v3 3/4] block: add a 'blockdev-snapshot' QMP command, Alberto Garcia, 2015/09/10
- [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Alberto Garcia, 2015/09/10
- Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat,
Max Reitz <=
- Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Kevin Wolf, 2015/09/11
- Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Max Reitz, 2015/09/11
- Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Alberto Garcia, 2015/09/14
- Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Kevin Wolf, 2015/09/14
- Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Alberto Garcia, 2015/09/14
Re: [Qemu-devel] [PATCH v3 2/4] block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat, Eric Blake, 2015/09/11
[Qemu-devel] [PATCH v3 4/4] block: add tests for the 'blockdev-snapshot' command, Alberto Garcia, 2015/09/10