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net/9p: Handle mount errors correctly. 

With this patch we have

# mount -t 9p -o trans=virtio virtio2 /mnt/
# mount -t 9p -o trans=virtio virtio2 /mnt/
mount: virtio2 already mounted or /mnt/ busy
mount: according to mtab, virtio2 is already mounted on /mnt
# mount -t 9p -o trans=virtio virtio3 /mnt/ -o debug=0xfff
mount: special device virtio3 does not exist

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 17:27:02 +00:00 committed by Eric Van Hensbergen
parent 37c1209d41
commit c1a7c22620
1 changed files with 3 additions and 1 deletions
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4
net/9p/trans_virtio.c
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@ -279,6 +279,7 @@ static int
p9_virtio_create(struct p9_client *client, const char *devname, char *args) p9_virtio_create(struct p9_client *client, const char *devname, char *args)
{ {
struct virtio_chan *chan; struct virtio_chan *chan;
int ret = -ENOENT;
int found = 0; int found = 0;
mutex_lock(&virtio_9p_lock); mutex_lock(&virtio_9p_lock);
@ -289,13 +290,14 @@ p9_virtio_create(struct p9_client *client, const char *devname, char *args)
found = 1; found = 1;
break; break;
} }
ret = -EBUSY;
} }
} }
mutex_unlock(&virtio_9p_lock); mutex_unlock(&virtio_9p_lock);
if (!found) { if (!found) {
printk(KERN_ERR "9p: no channels available\n"); printk(KERN_ERR "9p: no channels available\n");
return -ENODEV; return ret;
} }
client->trans = (void *)chan; client->trans = (void *)chan;