CIFS: Add SMB2 support for is_path_accessible
that needs for a successful mount through SMB2 protocol.
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index 97c1d42..7dab9c0 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -330,3 +330,64 @@
ctoUTF16_out:
return i;
}
+
+#ifdef CONFIG_CIFS_SMB2
+/*
+ * cifs_local_to_utf16_bytes - how long will a string be after conversion?
+ * @from - pointer to input string
+ * @maxbytes - don't go past this many bytes of input string
+ * @codepage - source codepage
+ *
+ * Walk a string and return the number of bytes that the string will
+ * be after being converted to the given charset, not including any null
+ * termination required. Don't walk past maxbytes in the source buffer.
+ */
+
+static int
+cifs_local_to_utf16_bytes(const char *from, int len,
+ const struct nls_table *codepage)
+{
+ int charlen;
+ int i;
+ wchar_t wchar_to;
+
+ for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
+ charlen = codepage->char2uni(from, len, &wchar_to);
+ /* Failed conversion defaults to a question mark */
+ if (charlen < 1)
+ charlen = 1;
+ }
+ return 2 * i; /* UTF16 characters are two bytes */
+}
+
+/*
+ * cifs_strndup_to_utf16 - copy a string to wire format from the local codepage
+ * @src - source string
+ * @maxlen - don't walk past this many bytes in the source string
+ * @utf16_len - the length of the allocated string in bytes (including null)
+ * @cp - source codepage
+ * @remap - map special chars
+ *
+ * Take a string convert it from the local codepage to UTF16 and
+ * put it in a new buffer. Returns a pointer to the new string or NULL on
+ * error.
+ */
+__le16 *
+cifs_strndup_to_utf16(const char *src, const int maxlen, int *utf16_len,
+ const struct nls_table *cp, int remap)
+{
+ int len;
+ __le16 *dst;
+
+ len = cifs_local_to_utf16_bytes(src, maxlen, cp);
+ len += 2; /* NULL */
+ dst = kmalloc(len, GFP_KERNEL);
+ if (!dst) {
+ *utf16_len = 0;
+ return NULL;
+ }
+ cifsConvertToUTF16(dst, src, strlen(src), cp, remap);
+ *utf16_len = len;
+ return dst;
+}
+#endif /* CONFIG_CIFS_SMB2 */