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Re: [Qemu-devel] [PATCH V2] block: introduce BlockDriver.bdrv_needs_file

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH V2] block: introduce BlockDriver.bdrv_needs_filename to enable some drivers.
Date: Mon, 23 Sep 2013 09:59:27 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8

On 09/23/2013 05:52 AM, Benoît Canet wrote:
> Some drivers will have driver specifics options but no filename.
> This new bool allow the block layer to treat them correctly.
> The .bdrv_needs_filename is set in drivers not having .bdrv_parse_filename and
> not having .bdrv_open.
> The first exception to this rule will be the quorum driver.
> Signed-off-by: Benoit Canet <address@hidden>
> ---

> +++ b/include/block/block_int.h
> @@ -73,6 +73,7 @@ struct BlockDriver {
>      /* Any driver implementing this callback is expected to be able to handle
>       * NULL file names in its .bdrv_open() implementation */
>      void (*bdrv_parse_filename)(const char *filename, QDict *options, Error 
> **errp);
> +    bool bdrv_needs_filename;

Please use inline comments documenting this field's use.

>      /* For handling image reopen for split or non-split files */
>      int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state,

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

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