- tkn_e = strchr(ref_unc+2, '\\');
- if (tkn_e) {
- tkn_e = strchr(tkn_e+1, '\\');
- if (tkn_e) {
- strcat(mountdata, ",prefixpath=");
- strcat(mountdata, tkn_e+1);
- }
+ tkn_e = strchr(ref->node_name + 2, '\\');
+ if (tkn_e == NULL) /* invalid unc, missing share name*/
+ goto compose_mount_options_out;
+
+ fullpath = build_path_from_dentry(dentry);
+ tkn_e = strchr(tkn_e + 1, '\\');
+ if (tkn_e || strlen(fullpath) - (ref->path_consumed)) {
+ strncat(mountdata, &sep, 1);
+ strcat(mountdata, "prefixpath=");
+ if (tkn_e)
+ strcat(mountdata, tkn_e + 1);
+ strcat(mountdata, fullpath + (ref->path_consumed));