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Commit d22f76e7 authored by Alex Elder's avatar Alex Elder Committed by Sage Weil
Browse files

rbd: dynamically allocate pool name 



There is no need to impose a small limit the length of the pool name
recorded for an rbd image in a struct rbd_device.  Remove the
limitation by allocating space for the pool name ynamically.

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent 9bb2f334

drivers/block/rbd.c

+19 −8
Original line number Diff line number Diff line
@@ -56,7 +56,6 @@ 
#define RBD_MINORS_PER_MAJOR	256		/* max minors per blkdev */



#define RBD_MAX_MD_NAME_LEN	(RBD_MAX_OBJ_NAME_LEN + sizeof(RBD_SUFFIX))

#define RBD_MAX_POOL_NAME_LEN	64

#define RBD_MAX_SNAP_NAME_LEN	32

#define RBD_MAX_OPT_LEN		1024
@@ -166,7 +165,7 @@ struct rbd_device { 
	char			obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */

	int			obj_len;

	char			obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */

	char			pool_name[RBD_MAX_POOL_NAME_LEN];

	char			*pool_name;

	int			pool_id;



	struct ceph_osd_event   *watch_event;
@@ -2331,6 +2330,8 @@ static inline char *dup_token(const char **buf, size_t *lenp) 
 * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based

 * on the list of monitor addresses and other options provided via

 * /sys/bus/rbd/add.

 *

 * Note: rbd_dev is assumed to have been initially zero-filled.

 */

static int rbd_add_parse_args(struct rbd_device *rbd_dev,

			      const char *buf,
@@ -2340,6 +2341,7 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev, 
			      size_t options_size)

{

	size_t len;

	int ret;



	/* The first four tokens are required */
@@ -2355,13 +2357,14 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev, 
	if (!len || len >= options_size)

		return -EINVAL;



	len = copy_token(&buf, rbd_dev->pool_name, sizeof (rbd_dev->pool_name));

	if (!len || len >= sizeof (rbd_dev->pool_name))

		return -EINVAL;

	rbd_dev->pool_name = dup_token(&buf, NULL);

	if (!rbd_dev->pool_name)

		return -ENOMEM;



	ret = -EINVAL;

	len = copy_token(&buf, rbd_dev->obj, sizeof (rbd_dev->obj));

	if (!len || len >= sizeof (rbd_dev->obj))

		return -EINVAL;

		goto out_err;



	/* We have the object length in hand, save it. */
@@ -2380,9 +2383,15 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev, 
		memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME,

			sizeof (RBD_SNAP_HEAD_NAME));

	else if (len >= sizeof (rbd_dev->snap_name))

		return -EINVAL;

		goto out_err;



	return 0;



out_err:

	kfree(rbd_dev->pool_name);

	rbd_dev->pool_name = NULL;



	return ret;

}



static ssize_t rbd_add(struct bus_type *bus,
@@ -2480,6 +2489,7 @@ static ssize_t rbd_add(struct bus_type *bus, 
err_out_client:

	rbd_put_client(rbd_dev);

err_put_id:

	kfree(rbd_dev->pool_name);

	rbd_id_put(rbd_dev);

err_nomem:

	kfree(options);
@@ -2528,6 +2538,7 @@ static void rbd_dev_release(struct device *dev) 
	unregister_blkdev(rbd_dev->major, rbd_dev->name);



	/* done with the id, and with the rbd_dev */

	kfree(rbd_dev->pool_name);

	rbd_id_put(rbd_dev);

	kfree(rbd_dev);