Re: [PATCH] libxl: locally attach disks with hotplug scripts for bootloader execution

["Roger Pau Monné" <roger.pau@citrix.com>]

El 30/06/15 a les 14.31, Ian Campbell ha escrit:
> On Thu, 2015-06-25 at 16:17 +0200, Roger Pau Monne wrote:
>> Or else bootloader execution fails. Tested using an iSCSI disk.
>>
>> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
>> Reported-by: Hildebrand, Nils <Nils.Hildebrand@bva.bund.de>
>> Cc: Ian Jackson <ian.jackson@eu.citrix.com>
>> Cc: Ian Campbell <ian.campbell@citrix.com>
>> Cc: Wei Liu <wei.liu2@citrix.com>
>> Cc: George Dunlap <george.dunlap@eu.citrix.com>
>> ---
>>  tools/libxl/libxl.c | 17 ++++++++++++-----
>>  1 file changed, 12 insertions(+), 5 deletions(-)
>>
>> diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
>> index 9117b01..6430836 100644
>> --- a/tools/libxl/libxl.c
>> +++ b/tools/libxl/libxl.c
>> @@ -3063,9 +3063,16 @@ void libxl__device_disk_local_initiate_attach(libxl__egc *egc,
>>  
>>      switch (disk->backend) {
>>          case LIBXL_DISK_BACKEND_PHY:
>> -            LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "locally attaching PHY disk %s",
>> -                       disk->pdev_path);
>> -            dev = disk->pdev_path;
>> +            if (disk->script == NULL && disk->backend_domname == NULL) {
>> +                LOG(DEBUG, "locally attaching PHY disk %s", disk->pdev_path);
>> +                dev = disk->pdev_path;
>> +            } else {
>> +                libxl__prepare_ao_device(ao, &dls->aodev);
>> +                dls->aodev.callback = local_device_attach_cb;
>> +                device_disk_add(egc, LIBXL_TOOLSTACK_DOMID, disk, &dls->aodev,
>> +                                libxl__alloc_vdev, (void *) blkdev_start);
>> +                return;
> 
> Perhaps make this and the qdisk stuff common via a new helper?

I think this is already solved in the new patch posted by George.

>> @@ -3142,7 +3149,7 @@ static void local_device_attach_cb(libxl__egc *egc, libxl__ao_device *aodev)
>>      }
>>  
>>      dev = GCSPRINTF("/dev/%s", disk->vdev);
>> -    LOG(DEBUG, "locally attaching qdisk %s", dev);
>> +    LOG(DEBUG, "locally attaching disk %s", dev);
>>  
>>      rc = libxl__device_from_disk(gc, LIBXL_TOOLSTACK_DOMID, disk, &device);
>>      if (rc < 0)
>> @@ -3183,6 +3190,7 @@ void libxl__device_disk_local_initiate_detach(libxl__egc *egc,
>>  
>>      switch (disk->backend) {
>>          case LIBXL_DISK_BACKEND_QDISK:
>> +        case LIBXL_DISK_BACKEND_PHY:
> 
> What ensures that things which get here were lcoally attached rather
> than just plain block devices? Is disk->vdev always NULL in the latter
> case, or is there something further up?

Yes, disk->vdev is always NULL if the disk hasn't been locally attached.

Roger.


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