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Commit 0d6d1e9c authored by Mike Christie's avatar Mike Christie Committed by Ilya Dryomov
Browse files

rbd: add 'config_info' sysfs rbd device attribute 



Export the info used to setup the rbd image, so it can be used to remap
the image.

Signed-off-by: default avatarMike Christie <mchristi@redhat.com>
[idryomov@gmail.com: do_rbd_add() EH]
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 92a58671

Documentation/ABI/testing/sysfs-bus-rbd

+5 −0
Original line number Diff line number Diff line
@@ -57,6 +57,11 @@ cluster_fsid 


	The ceph cluster UUID.  (August 2016, since 4.9.)



config_info



	The string written into /sys/bus/rbd/add{,_single_major}.  (August

	2016, since 4.9.)



features



	A hexadecimal encoding of the feature bits for this image.

drivers/block/rbd.c

+21 −2
Original line number Diff line number Diff line
@@ -370,6 +370,7 @@ struct rbd_device { 
	unsigned long		flags;		/* possibly lock protected */

	struct rbd_spec		*spec;

	struct rbd_options	*opts;

	char			*config_info;	/* add{,_single_major} string */



	struct ceph_object_id	header_oid;

	struct ceph_object_locator header_oloc;
@@ -4620,6 +4621,14 @@ static ssize_t rbd_cluster_fsid_show(struct device *dev, 
	return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid);

}



static ssize_t rbd_config_info_show(struct device *dev,

				    struct device_attribute *attr, char *buf)

{

	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);



	return sprintf(buf, "%s\n", rbd_dev->config_info);

}



static ssize_t rbd_pool_show(struct device *dev,

			     struct device_attribute *attr, char *buf)

{
@@ -4732,6 +4741,7 @@ static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); 
static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL);

static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);

static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL);

static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL);

static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);

static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL);

static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
@@ -4749,6 +4759,7 @@ static struct attribute *rbd_attrs[] = { 
	&dev_attr_client_addr.attr,

	&dev_attr_client_id.attr,

	&dev_attr_cluster_fsid.attr,

	&dev_attr_config_info.attr,

	&dev_attr_pool.attr,

	&dev_attr_pool_id.attr,

	&dev_attr_name.attr,
@@ -4824,6 +4835,7 @@ static void rbd_dev_free(struct rbd_device *rbd_dev) 


	ceph_oid_destroy(&rbd_dev->header_oid);

	ceph_oloc_destroy(&rbd_dev->header_oloc);

	kfree(rbd_dev->config_info);



	rbd_put_client(rbd_dev->rbd_client);

	rbd_spec_put(rbd_dev->spec);
@@ -6223,10 +6235,18 @@ static ssize_t do_rbd_add(struct bus_type *bus, 
	spec = NULL;		/* rbd_dev now owns this */

	rbd_opts = NULL;	/* rbd_dev now owns this */



	rbd_dev->config_info = kstrdup(buf, GFP_KERNEL);

	if (!rbd_dev->config_info) {

		rc = -ENOMEM;

		goto err_out_rbd_dev;

	}



	down_write(&rbd_dev->header_rwsem);

	rc = rbd_dev_image_probe(rbd_dev, 0);

	if (rc < 0)

	if (rc < 0) {

		up_write(&rbd_dev->header_rwsem);

		goto err_out_rbd_dev;

	}



	/* If we are mapping a snapshot it must be marked read-only */
@@ -6253,7 +6273,6 @@ static ssize_t do_rbd_add(struct bus_type *bus, 
	return rc;



err_out_rbd_dev:

	up_write(&rbd_dev->header_rwsem);

	rbd_dev_destroy(rbd_dev);

err_out_client:

	rbd_put_client(rbdc);