Re: [Qemu-devel] [PATCH v5 02/27] qapi: Add lock-mode in blockdev-add options

[Max Reitz]

On 17.05.2016 09:35, Fam Zheng wrote:
> To allow overriding the default locking behavior when opening the image.
> 
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  qapi/block-core.json | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index 98a20d2..3c54f64 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -2032,6 +2032,21 @@
>              '*read-pattern': 'QuorumReadPattern' } }
>  
>  ##
> +# @BlockdevLockMode
> +#
> +# Describes the operation mode for the automatic conversion of plain
> +# zero writes by the OS to driver specific optimized zero write commands.

I don't think so. ;-)

Max

> +#
> +# @off:       Disabled
> +# @shared:    Use shared lock for both RO and RW images.
> +# @exclusive: Use exclusive lock for RW images, and shared lock for RO 
> images.
> +#
> +# Since: 2.7
> +##
> +{ 'enum': 'BlockdevLockMode',
> +  'data': [ 'off', 'shared', 'exclusive' ] }
> +
> +##
>  # @BlockdevOptions
>  #
>  # Options for creating a block device.  Many options are available for all
> @@ -2065,6 +2080,8 @@
>  # @detect-zeroes: #optional detect and optimize zero writes (Since 2.1)
>  #                 (default: off)
>  #
> +# @lock-mode: #optional how to lock the image. (default: exclusive) (Since 
> 2.7)
> +#
>  # Remaining options are determined by the block driver.
>  #
>  # Since: 1.7
> @@ -2082,7 +2099,8 @@
>              '*stats-account-invalid': 'bool',
>              '*stats-account-failed': 'bool',
>              '*stats-intervals': ['int'],
> -            '*detect-zeroes': 'BlockdevDetectZeroesOptions' },
> +            '*detect-zeroes': 'BlockdevDetectZeroesOptions',
> +            '*lock-mode': 'BlockdevLockMode' },
>    'discriminator': 'driver',
>    'data': {
>        'archipelago':'BlockdevOptionsArchipelago',
>

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