cifs: implement CIFSFormatMFSymlink()

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 6e4e8957595d19a124ac1dbab468e407cbf49737..0473a86031a5ea189cb66e236b06deeb27d94332 100644 (file)
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -92,6 +92,47 @@ CIFSParseMFSymlink(const u8 *buf,
 }
 
 static int
+CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
+{
+       unsigned int link_len;
+       unsigned int ofs;
+       struct MD5Context md5_ctx;
+       u8 md5_hash[16];
+
+       if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
+               return -EINVAL;
+
+       link_len = strlen(link_str);
+
+       if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
+               return -ENAMETOOLONG;
+
+       cifs_MD5_init(&md5_ctx);
+       cifs_MD5_update(&md5_ctx, (const u8 *)link_str, link_len);
+       cifs_MD5_final(md5_hash, &md5_ctx);
+
+       snprintf(buf, buf_len,
+                CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
+                link_len,
+                CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
+
+       ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
+       memcpy(buf + ofs, link_str, link_len);
+
+       ofs += link_len;
+       if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
+               buf[ofs] = '\n';
+               ofs++;
+       }
+
+       while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
+               buf[ofs] = ' ';
+               ofs++;
+       }
+
+       return 0;
+}
+
 CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
                   const unsigned char *searchName, char **symlinkinfo,
                   const struct nls_table *nls_codepage, int remap)