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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>
This commit is contained in:
Aneesh Kumar K.V 2010-02-15 17:27:00 +00:00 committed by Eric Van Hensbergen
parent 64ba992675
commit f75580c4af
2 changed files with 9 additions and 7 deletions
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2
include/linux/virtio_9p.h
View File

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

8
net/9p/trans_virtio.c
View File

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