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Re: [Qemu-devel] [PATCH] block: extend BLOCK_IO_ERROR event with nospace
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [PATCH] block: extend BLOCK_IO_ERROR event with nospace indicator |
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Date: |
Fri, 29 Aug 2014 14:33:26 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0 |
On 08/29/2014 02:07 PM, Luiz Capitulino wrote:
> Management software, such as RHEV's vdsm, want to be able to allocate
> disk space on demand. The basic use case is to start a VM with a small
> disk and then the disk is enlarged when QEMU hits a ENOSPC condition.
>
> To this end, the management software has to be notified when QEMU
> encounters ENOSPC. The solution implemented by this commit is simple:
> it extends the BLOCK_IO_ERROR with a 'nospace' key, which is true
> when QEMU is stopped due to ENOSPC.
>
> Note that support for querying this event is already present in
> query-block by means of the 'io-status' key. Also, the new 'nospace'
> BLOCK_IO_ERROR field shares the same semantics with 'io-status',
> which basically means that werror= has to be set to either
> 'stop' or 'enospc' to enable 'nospace'.
>
> Finally, this commit also updates the 'io-status' key doc in the
> schema with a list of supported device models.
>
> Signed-off-by: Luiz Capitulino <address@hidden>
> ---
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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