[PATCH REPOST 2/4] rbd: kill rbd_spec->image_name_len

[Alex Elder <elder@inktank.com>]

There may have been a benefit to hanging on to the length of an
image name before, but there is really none now.  The only time it's
used is when probing for rbd images, so we can just compute the
length then.

Signed-off-by: Alex Elder <elder@inktank.com>
---
 drivers/block/rbd.c |   19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 128978c..a002984 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -147,7 +147,6 @@ struct rbd_spec {
 	char		*image_id;
 	size_t		image_id_len;
 	char		*image_name;
-	size_t		image_name_len;

 	u64		snap_id;
 	char		*snap_name;
@@ -2563,15 +2562,15 @@ static char *rbd_dev_image_name(struct
rbd_device *rbd_dev)

 	rbd_assert(!rbd_dev->spec->image_name);

-	image_id_size = sizeof (__le32) + rbd_dev->spec->image_id_len;
+	len = strlen(rbd_dev->spec->image_id);
+	image_id_size = sizeof (__le32) + len;
 	image_id = kmalloc(image_id_size, GFP_KERNEL);
 	if (!image_id)
 		return NULL;

 	p = image_id;
 	end = (char *) image_id + image_id_size;
-	ceph_encode_string(&p, end, rbd_dev->spec->image_id,
-				(u32) rbd_dev->spec->image_id_len);
+	ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32) len);

 	size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX;
 	reply_buf = kmalloc(size, GFP_KERNEL);
@@ -2631,14 +2630,12 @@ static int rbd_dev_probe_update_spec(struct
rbd_device *rbd_dev)
 	/* Fetch the image name; tolerate failure here */

 	name = rbd_dev_image_name(rbd_dev);
-	if (name) {
-		rbd_dev->spec->image_name_len = strlen(name);
+	if (name)
 		rbd_dev->spec->image_name = (char *) name;
-	} else {
+	else
 		pr_warning(RBD_DRV_NAME "%d "
 			"unable to get image name for image id %s\n",
 			rbd_dev->major, rbd_dev->spec->image_id);
-	}

 	/* Look up the snapshot name. */

@@ -3252,7 +3249,7 @@ static int rbd_add_parse_args(const char *buf,
 	if (!*spec->pool_name)
 		goto out_err;	/* Missing pool name */

-	spec->image_name = dup_token(&buf, &spec->image_name_len);
+	spec->image_name = dup_token(&buf, NULL);
 	if (!spec->image_name)
 		goto out_mem;
 	if (!*spec->image_name)
@@ -3342,7 +3339,7 @@ static int rbd_dev_image_id(struct rbd_device
*rbd_dev)
 	 * First, see if the format 2 image id file exists, and if
 	 * so, get the image's persistent id from it.
 	 */
-	size = sizeof (RBD_ID_PREFIX) + rbd_dev->spec->image_name_len;
+	size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name);
 	object_name = kmalloc(size, GFP_NOIO);
 	if (!object_name)
 		return -ENOMEM;
@@ -3400,7 +3397,7 @@ static int rbd_dev_v1_probe(struct rbd_device
*rbd_dev)

 	/* Record the header object name for this rbd image. */

-	size = rbd_dev->spec->image_name_len + sizeof (RBD_SUFFIX);
+	size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX);
 	rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
 	if (!rbd_dev->header_name) {
 		ret = -ENOMEM;
-- 
1.7.9.5