Re: [Xen-devel] [PATCH v2 4/5] libxl: call hotplug scripts from xl for NetBSD

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 07/26/12 21:54, Roger Pau Monne wrote:

> Add the missing NetBSD functions to call hotplug scripts, and disable
> xenbackendd if libxl/disable_udev is not set.
> 
> Cc: Christoph Egger <Christoph.Egger@xxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>


Acked-by: Christoph Egger <Christoph.Egger@xxxxxxx>

> Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxx>
> ---
>  tools/libxl/libxl_netbsd.c      |   57 
> ++++++++++++++++++++++++++++++++++++++-
>  tools/xenbackendd/xenbackendd.c |    8 +++++-
>  2 files changed, 63 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/libxl/libxl_netbsd.c b/tools/libxl/libxl_netbsd.c
> index 28cdf21..9587833 100644
> --- a/tools/libxl/libxl_netbsd.c
> +++ b/tools/libxl/libxl_netbsd.c
> @@ -32,10 +32,65 @@ char *libxl__devid_to_localdev(libxl__gc *gc, int devid)
>  }
>  
>  /* Hotplug scripts caller functions */
> +static int libxl__hotplug(libxl__gc *gc, libxl__device *dev, char ***args,
> +                          libxl__device_action action)
> +{
> +    char *be_path = libxl__device_backend_path(gc, dev);
> +    char *script;
> +    int nr = 0, rc = 0, arraysize = 4;
> +
> +    script = libxl__xs_read(gc, XBT_NULL,
> +                            GCSPRINTF("%s/%s", be_path, "script"));
> +    if (!script) {
> +        LOGEV(ERROR, errno, "unable to read script from %s", be_path);
> +        rc = ERROR_FAIL;
> +        goto out;
> +    }
> +
> +    GCNEW_ARRAY(*args, arraysize);
> +    (*args)[nr++] = script;
> +    (*args)[nr++] = be_path;
> +    (*args)[nr++] = GCSPRINTF("%d", action == DEVICE_CONNECT ?
> +                                    XenbusStateInitWait : XenbusStateClosed);
> +    (*args)[nr++] = NULL;
> +    assert(nr == arraysize);
> +
> +out:
> +    return rc;
> +}
> +
>  int libxl__get_hotplug_script_info(libxl__gc *gc, libxl__device *dev,
>                                     char ***args, char ***env,
>                                     libxl__device_action action,
>                                     int num_exec)
>  {
> -    return 0;
> +    char *disable_udev = libxl__xs_read(gc, XBT_NULL, DISABLE_UDEV_PATH);
> +    int rc;
> +
> +    /* Check if we have to run hotplug scripts */
> +    if (!disable_udev || num_exec > 0) {
> +        rc = 0;
> +        goto out;
> +    }
> +
> +    switch (dev->backend_kind) {
> +    case LIBXL__DEVICE_KIND_VBD:
> +    case LIBXL__DEVICE_KIND_VIF:
> +        if (num_exec != 0) {
> +            rc = 0;
> +            goto out;
> +        }
> +        rc = libxl__hotplug(gc, dev, args, action);
> +        if (!rc) rc = 1;
> +        break;
> +    default:
> +        /* If no need to execute any hotplug scripts,
> +         * call the callback manually
> +         */
> +        rc = 0;
> +        break;
> +    }
> +
> +out:
> +    return rc;
>  }
> diff --git a/tools/xenbackendd/xenbackendd.c b/tools/xenbackendd/xenbackendd.c
> index 6b5bb8e..5381a2a 100644
> --- a/tools/xenbackendd/xenbackendd.c
> +++ b/tools/xenbackendd/xenbackendd.c
> @@ -33,6 +33,7 @@
>  #define DEVTYPE_UNKNOWN 0
>  #define DEVTYPE_VIF 1
>  #define DEVTYPE_VBD 2
> +#define DISABLE_EXEC "libxl/disable_udev"
>  
>  #define DOMAIN_PATH "/local/domain/0"
>  
> @@ -149,7 +150,7 @@ main(int argc, char * const argv[])
>       unsigned int num;
>       char *s;
>       int state;
> -     char *sstate;
> +     char *sstate, *sdisable;
>       char *p;
>       char buf[80];
>       int type;
> @@ -245,6 +246,10 @@ main(int argc, char * const argv[])
>                       continue;
>               }
>  
> +             sdisable = xs_read(xs, XBT_NULL, DISABLE_EXEC, 0);
> +             if (sdisable)
> +                     goto next1;
> +
>               if (strlen(vec[XS_WATCH_PATH]) < sizeof("state"))
>                       goto next1;
>  
> @@ -314,6 +319,7 @@ next2:
>               free(sstate);
>  
>  next1:
> +             free(sdisable);
>               free(vec);
>       }
>  



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