Re: [Qemu-devel] [RFC PATCH v3 1/6] block: introduce prealloc_mode

[Eric Blake <eblake@redhat.com>]

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On 12/18/2013 07:27 PM, Hu Tao wrote:
> This patch prepares for the subsequent patches.
> 
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  block/qcow2.c         | 6 +++---
>  include/block/block.h | 6 ++++++
>  2 files changed, 9 insertions(+), 3 deletions(-)
> 

> +++ b/include/block/block.h
> @@ -527,4 +527,10 @@ int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
>  int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
>  bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
>  
> +enum prealloc_mode {
> +    PREALLOC_OFF = 0,
> +    PREALLOC_METADATA,
> +    PREALLOC_FULL,
> +};

Why not make this a QAPI enum:

{ 'enum': 'PreallocMode', 'data': ['off', 'metadata', 'full'] }

After all, this is the sort of thing where we will eventually want to
select the prealloc mode of new files being created by online operations
such as snapshot creation.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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