[pve-devel] qemu2.7: cpu hotplug && hot-unplug v1

[Alexandre DERUMIER]

>>Due to scope rules in C The declaration of aio_context must be moved out 
>>of the while block. I would suggest the following code then: 
>>AioContext *aio_context = NULL; 

Yes, sure. I just post a basic sample ;)

also, 
aio_context = blk_get_aio_context(di->bs); 

is wrong

it should be the blk device, something like:


+       BlockBackend *blk;
+       const char *devname = bdrv_get_device_name(di->bs);
+       blk = blk_by_name(devname);
+
+       aio_context = blk_get_aio_context(blk);

----- Mail original -----
De: "datanom.net" <mir at datanom.net>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Lundi 12 Septembre 2016 14:22:20
Objet: Re: [pve-devel] qemu2.7: cpu hotplug && hot-unplug v1

On 2016-09-12 13:48, Alexandre DERUMIER wrote: 
> I think a basic implementation could be: 
> 
> 
> while (l) { 
> PVEBackupDevInfo *di = (PVEBackupDevInfo *)l->data; 
> l = g_list_next(l); 
> + AioContext *aio_context; 
> + aio_context = blk_get_aio_context(di->bs); 
> + aio_context_acquire(aio_context); 
> + bdrv_set_aio_context(di->target, aio_context); 
> 
> 
> backup_start(di->bs, di->target, speed, MIRROR_SYNC_MODE_FULL, 
> NULL, 
> BLOCKDEV_ON_ERROR_REPORT, 
> BLOCKDEV_ON_ERROR_REPORT, 
> pvebackup_dump_cb, pvebackup_complete_cb, di, 
> 1, NULL, &local_err); 
> 
> + aio_context_release(aio_context); 
> 
> if (local_err != NULL) { 
> error_setg(&backup_state.error, "backup_job_create 
> failed"); 
> pvebackup_cancel(NULL); 
> } 
> } 
> 
> 
> 
> (and the more difficult is to cleanly release aiocontext for all 
> exceptions) 
> qemu use a "goto out;" for this 
> 
> out: 
> aio_context_release(aio_context); 
> 
> 

Due to scope rules in C The declaration of aio_context must be moved out 
of the while block. I would suggest the following code then: 
AioContext *aio_context = NULL; 

while (l) { 
PVEBackupDevInfo *di = (PVEBackupDevInfo *)l->data; 
l = g_list_next(l); 
aio_context = blk_get_aio_context(di->bs); 
if (aio_context == NULL) { 
error_setg(&backup_state.error, "aio_context == NULL. 
backup_job_create failed"); 
goto out; 
} 
aio_context_acquire(aio_context); 
bdrv_set_aio_context(di->target, aio_context); 


backup_start(di->bs, di->target, speed, MIRROR_SYNC_MODE_FULL, NULL, 
BLOCKDEV_ON_ERROR_REPORT, BLOCKDEV_ON_ERROR_REPORT, 
pvebackup_dump_cb, pvebackup_complete_cb, di, 
1, NULL, &local_err); 

aio_context_release(aio_context); 

if (local_err != NULL) { 
error_setg(&backup_state.error, "backup_job_create failed"); 
pvebackup_cancel(NULL); 
} 
} 

out: 
if (aio_context) { 
aio_context_release(aio_context); 
} 

-- 
Hilsen/Regards 
Michael Rasmussen 

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mir <at> datanom <dot> net 
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mir <at> miras <dot> org 
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