*
* Returns: NULL if failed for any reason
* dev if successful (may change if new dev opened)
+ * This routine must be single threaded because we may create
+ * multiple devices (for files), thus we have our own mutex
+ * on top of the device mutex.
*/
DEVICE * acquire_device_for_append(JCR *jcr, DEVICE *dev, DEV_BLOCK *block)
{
lock_device(dev);
block_device(dev, BST_DOING_ACQUIRE);
unlock_device(dev);
+ P(mutex); /* lock all devices */
Dmsg1(190, "acquire_append device is %s\n", dev_is_tape(dev)?"tape":"disk");
open_vols++;
}
if (dev->state & ST_FILE && dev->max_open_vols > open_vols) {
- P(mutex); /* lock all devices */
d = init_dev(NULL, (DEVRES *)dev->device); /* init new device */
d->prev = dev; /* chain in new device */
d->next = dev->next;
lock_device(dev);
block_device(dev, BST_DOING_ACQUIRE);
unlock_device(dev);
- V(mutex);
} else {
Jmsg(jcr, M_FATAL, 0, _("Device %s is busy writing on another Volume.\n"), dev_name(dev));
goto get_out;
P(dev->mutex);
unblock_device(dev);
V(dev->mutex);
+ V(mutex); /* unlock other threads */
return rtn_dev;
}