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Commit 86c84373 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Eric Van Hensbergen
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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: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 97ee9b02

include/linux/virtio.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

net/9p/trans_virtio.c

+20 −0
Original line number Diff line number Diff line
@@ -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);