+/*
+ * Parse a devname into substrings and populate the vol->UNC and vol->prepath
+ * fields with the result. Returns 0 on success and an error otherwise.
+ */
+static int
+cifs_parse_devname(const char *devname, struct smb_vol *vol)
+{
+ char *pos;
+ const char *delims = "/\\";
+ size_t len;
+
+ /* make sure we have a valid UNC double delimiter prefix */
+ len = strspn(devname, delims);
+ if (len != 2)
+ return -EINVAL;
+
+ /* find delimiter between host and sharename */
+ pos = strpbrk(devname + 2, delims);
+ if (!pos)
+ return -EINVAL;
+
+ /* skip past delimiter */
+ ++pos;
+
+ /* now go until next delimiter or end of string */
+ len = strcspn(pos, delims);
+
+ /* move "pos" up to delimiter or NULL */
+ pos += len;
+ vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
+ if (!vol->UNC)
+ return -ENOMEM;
+
+ convert_delimiter(vol->UNC, '\\');
+
+ /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
+ if (!*pos++ || !*pos)
+ return 0;
+
+ vol->prepath = kstrdup(pos, GFP_KERNEL);
+ if (!vol->prepath)
+ return -ENOMEM;
+
+ return 0;
+}
+