rbd: get rid of snap_name_len

The value returned in the "snap_name_len" argument to
rbd_add_parse_args() is never actually used, so get rid of it.

The snap_name_len recorded in rbd_dev_v2_snap_name() is not
useful either, so get rid of that too.

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

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 68447d8..7bd2313 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2408,7 +2408,6 @@ static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
        int ret;
        void *p;
        void *end;
-       size_t snap_name_len;
        char *snap_name;
 
        size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN;
@@ -2428,9 +2427,7 @@ static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
 
        p = reply_buf;
        end = (char *) reply_buf + size;
-       snap_name_len = 0;
-       snap_name = ceph_extract_encoded_string(&p, end, &snap_name_len,
-                               GFP_KERNEL);
+       snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
        if (IS_ERR(snap_name)) {
                ret = PTR_ERR(snap_name);
                goto out;
@@ -2849,8 +2846,7 @@ static struct ceph_options *rbd_add_parse_args(struct rbd_device *rbd_dev,
                                                const char *buf,
                                                char *options,
                                                size_t options_size,
-                                               char **snap_name,
-                                               size_t *snap_name_len)
+                                               char **snap_name)
 {
        size_t len;
        const char *mon_addrs;
@@ -2898,7 +2894,7 @@ static struct ceph_options *rbd_add_parse_args(struct rbd_device *rbd_dev,
                goto out_err;
        memcpy(*snap_name, buf, len);
        *(*snap_name + len) = '\0';
-       *snap_name_len = len;
+
        /* Initialize all rbd options to the defaults */
 
        rbd_opts.read_only = RBD_READ_ONLY_DEFAULT;
@@ -3131,7 +3127,6 @@ static ssize_t rbd_add(struct bus_type *bus,
        char *options;
        struct rbd_device *rbd_dev = NULL;
        char *snap_name;
-       size_t snap_name_len = 0;
        struct ceph_options *ceph_opts;
        struct ceph_osd_client *osdc;
        int rc = -ENOMEM;
@@ -3154,7 +3149,7 @@ static ssize_t rbd_add(struct bus_type *bus,
 
        /* parse add command */
        ceph_opts = rbd_add_parse_args(rbd_dev, buf, options, count,
-                               &snap_name, &snap_name_len);
+                               &snap_name);
        if (IS_ERR(ceph_opts)) {
                rc = PTR_ERR(ceph_opts);
                goto err_out_mem;