net/9p: Add multi channel support.

This is needed for supporting multiple mount points.

We can find out the device names to be used with mount by checking

/sys/devices/virtio-pci/virtio*/device file

if the device file have value 9 then the specific virtio device can
be used for mounting.

ex:
 #cat /sys/devices/virtio-pci/virtio1/device
 9

now we can mount using
# mount -t 9p -o trans=virtio virtio1  /mnt/
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

include/linux/virtio_9p.h

@@ -6,6 +6,6 @@
 #include <linux/virtio_config.h>
 
 /* Maximum number of virtio channels per partition (1 for now) */
-#define MAX_9P_CHAN	1
+#define MAX_9P_CHAN	10
 
 #endif /* _LINUX_VIRTIO_9P_H */

net/9p/trans_virtio.c

@@ -296,14 +296,16 @@ p9_virtio_create(struct p9_client *client, const char *devname, char *args)
 
 	mutex_lock(&virtio_9p_lock);
 	while (index < MAX_9P_CHAN) {
-		if (chan->initialized && !chan->inuse) {
+		if (chan->initialized &&
+			!strcmp(devname, dev_name(&chan->vdev->dev))) {
+			if (!chan->inuse) {
 				chan->inuse = true;
 				break;
-		} else {
+			}
+		}
 		index++;
 		chan = &channels[index];
 	}
-	}
 	mutex_unlock(&virtio_9p_lock);
 
 	if (index >= MAX_9P_CHAN) {