+static char *build_path_to_root(struct cifs_sb_info *cifs_sb)
+{
+ int pplen = cifs_sb->prepathlen;
+ int dfsplen;
+ char *full_path = NULL;
+
+ /* if no prefix path, simply set path to the root of share to "" */
+ if (pplen == 0) {
+ full_path = kmalloc(1, GFP_KERNEL);
+ if (full_path)
+ full_path[0] = 0;
+ return full_path;
+ }
+
+ if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
+ dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
+ else
+ dfsplen = 0;
+
+ full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
+ if (full_path == NULL)
+ return full_path;
+
+ if (dfsplen) {
+ strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
+ /* switch slash direction in prepath depending on whether
+ * windows or posix style path names
+ */
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
+ int i;
+ for (i = 0; i < dfsplen; i++) {
+ if (full_path[i] == '\\')
+ full_path[i] = '/';
+ }
+ }
+ }
+ strncpy(full_path + dfsplen, cifs_sb->prepath, pplen);
+ full_path[dfsplen + pplen] = 0; /* add trailing null */
+ return full_path;
+}
+