rbd: kill rbd_spec->image_id_len

There is no real benefit to keeping the length of an image id, so
get rid of it.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index a002984..e01dbb1 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -145,7 +145,6 @@ struct rbd_spec {
        char            *pool_name;
 
        char            *image_id;
-       size_t          image_id_len;
        char            *image_name;
 
        u64             snap_id;
@@ -2492,7 +2491,6 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
        void *end;
        char *image_id;
        u64 overlap;
-       size_t len = 0;
        int ret;
 
        parent_spec = rbd_spec_alloc();
@@ -2526,13 +2524,12 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
        if (parent_spec->pool_id == CEPH_NOPOOL)
                goto out;       /* No parent?  No problem. */
 
-       image_id = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
+       image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
        if (IS_ERR(image_id)) {
                ret = PTR_ERR(image_id);
                goto out_err;
        }
        parent_spec->image_id = image_id;
-       parent_spec->image_id_len = len;
        ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err);
        ceph_decode_64_safe(&p, end, overlap, out_err);
 
@@ -3368,8 +3365,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
        p = response;
        rbd_dev->spec->image_id = ceph_extract_encoded_string(&p,
                                                p + RBD_IMAGE_ID_LEN_MAX,
-                                               &rbd_dev->spec->image_id_len,
-                                               GFP_NOIO);
+                                               NULL, GFP_NOIO);
        if (IS_ERR(rbd_dev->spec->image_id)) {
                ret = PTR_ERR(rbd_dev->spec->image_id);
                rbd_dev->spec->image_id = NULL;
@@ -3393,7 +3389,6 @@ static int rbd_dev_v1_probe(struct rbd_device *rbd_dev)
        rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL);
        if (!rbd_dev->spec->image_id)
                return -ENOMEM;
-       rbd_dev->spec->image_id_len = 0;
 
        /* Record the header object name for this rbd image. */
 
@@ -3443,7 +3438,7 @@ static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
         * Image id was filled in by the caller.  Record the header
         * object name for this rbd image.
         */
-       size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->spec->image_id_len;
+       size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id);
        rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
        if (!rbd_dev->header_name)
                return -ENOMEM;