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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2010-03-06 04:44:15 +0000
committerEric Van Hensbergen <ericvh@gmail.com>2010-03-13 08:57:29 -0600
commit86c8437383acd85c05ec7c9a004f59fe7ac9821a (patch)
tree05c2b805162f0aaf8f7d52e0b7fab4e12f8dcb75
parent97ee9b0257402f4731b55dfea42f24d26d793ddf (diff)
downloadop-kernel-dev-86c8437383acd85c05ec7c9a004f59fe7ac9821a.zip
op-kernel-dev-86c8437383acd85c05ec7c9a004f59fe7ac9821a.tar.gz
net/9p: Add sysfs mount_tag file for virtio 9P device
This adds a new file for virtio 9P device. The file contain details of the mount device name that should be used to mount the 9P file system. Ex: /sys/devices/virtio-pci/virtio1/mount_tag file now contian the tag name to be used to mount the 9P file system. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--include/linux/virtio.h1
-rw-r--r--net/9p/trans_virtio.c20
2 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index f508c65..40d1709 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -98,6 +98,7 @@ struct virtio_device {
void *priv;
};
+#define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 026775a..afde1a8 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -220,6 +220,20 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
return 0;
}
+static ssize_t p9_mount_tag_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct virtio_chan *chan;
+ struct virtio_device *vdev;
+
+ vdev = dev_to_virtio(dev);
+ chan = vdev->priv;
+
+ return snprintf(buf, chan->tag_len + 1, "%s", chan->tag);
+}
+
+static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);
+
/**
* p9_virtio_probe - probe for existence of 9P virtio channels
* @vdev: virtio device to probe
@@ -273,6 +287,11 @@ static int p9_virtio_probe(struct virtio_device *vdev)
tag, tag_len);
chan->tag = tag;
chan->tag_len = tag_len;
+ err = sysfs_create_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr);
+ if (err) {
+ kfree(tag);
+ goto out_free_vq;
+ }
mutex_lock(&virtio_9p_lock);
list_add_tail(&chan->chan_list, &virtio_chan_list);
mutex_unlock(&virtio_9p_lock);
@@ -348,6 +367,7 @@ static void p9_virtio_remove(struct virtio_device *vdev)
mutex_lock(&virtio_9p_lock);
list_del(&chan->chan_list);
mutex_unlock(&virtio_9p_lock);
+ sysfs_remove_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr);
kfree(chan->tag);
kfree(chan);
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