Re: [Qemu-devel] [v8 Patch 1/6]Qemu: Enhance "info block" to display host cache setting

[Luiz Capitulino <lcapitulino@redhat.com>]

On Sun, 30 Oct 2011 16:03:54 +0530
Supriya Kannery <supriyak@linux.vnet.ibm.com> wrote:

> Enhance "info block" to display hostcache setting for each
> block device.
> 
> Example:
> (qemu) info block
> ide0-hd0: removable=0 file=../sles11-32.raw ro=0 drv=raw encrypted=0
> 
> Enhanced to display "hostcache" setting:
> (qemu) info block
> ide0-hd0: removable=0 hostcache=1 file=../sles11-32.raw ro=0 drv=raw encrypted=0
> 
> Signed-off-by: Supriya Kannery <supriyak@linux.vnet.ibm.com>
> 
> ---
>  block.c         |   20 ++++++++++++++++----
>  qmp-commands.hx |    2 ++
>  2 files changed, 18 insertions(+), 4 deletions(-)
> 
> Index: qemu/qmp-commands.hx
> ===================================================================
> --- qemu.orig/qmp-commands.hx
> +++ qemu/qmp-commands.hx
> @@ -1142,6 +1142,7 @@ Each json-object contain the following:
>  - "locked": true if the device is locked, false otherwise (json-bool)
>  - "tray-open": only present if removable, true if the device has a tray,
>                 and it is open (json-bool)
> +- "hostcache": true if host pagecache enabled, false otherwise (json-bool)
>  - "inserted": only present if the device is inserted, it is a json-object
>     containing the following:
>           - "file": device file name (json-string)
> @@ -1168,6 +1169,7 @@ Example:
>              "io-status": "ok",
>              "device":"ide0-hd0",
>              "locked":false,
> +            "hostcache":false,
>              "removable":false,
>              "inserted":{
>                 "ro":false,
> Index: qemu/block.c
> ===================================================================
> --- qemu.orig/block.c
> +++ qemu/block.c
> @@ -1841,6 +1841,11 @@ static void bdrv_print_dict(QObject *obj
>                         qdict_get_bool(bs_dict, "tray-open"));
>      }
>  
> +    if (qdict_haskey(bs_dict, "hostcache")) {
> +        monitor_printf(mon, " hostcache=%d",
> +                       qdict_get_bool(bs_dict, "hostcache"));
> +    }

This series needs to be rebased, as the info block command has been
converted to the QAPI. Please, see the following commit for details:
b202381800d81fbff9978abbdea95760dd363bb6.

Also note that if you're adding new commands (I haven't reviewed the
series) you should use the QAPI. A document on how to use it is coming soon.

> 
>      if (qdict_haskey(bs_dict, "io-status")) {
>          monitor_printf(mon, " io-status=%s", qdict_get_str(bs_dict, "io-status"));
>      }
> @@ -1888,10 +1893,12 @@ void bdrv_info(Monitor *mon, QObject **r
>          QDict *bs_dict;
>  
>          bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', "
> -                                    "'removable': %i, 'locked': %i }",
> +                                    "'removable': %i, 'locked': %i, "
> +                                    "'hostcache': %i }",
>                                      bs->device_name,
>                                      bdrv_dev_has_removable_media(bs),
> -                                    bdrv_dev_is_medium_locked(bs));
> +                                    bdrv_dev_is_medium_locked(bs),
> +                                    !(bs->open_flags & BDRV_O_NOCACHE));
>          bs_dict = qobject_to_qdict(bs_obj);
>  
>          if (bdrv_dev_has_removable_media(bs)) {
> 
>