rbd: kill rbd_spec->image_name_len

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>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 32ed6e6456799b2b6d194d2f119f5a4f83e5c7dc..2e1d181cc84fccb7368258d70b304a9ab155df43 100644 (file)
--- 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;
@@ -2565,15 +2564,15 @@ 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);
@@ -2633,14 +2632,12 @@ 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. */
 
@@ -3254,7 +3251,7 @@ 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)
@@ -3344,7 +3341,7 @@ 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;
@@ -3402,7 +3399,7 @@ 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;