[PATCH] cifs: Gracefully turn off serverino (when serverino is enabled on mount)

Old servers such as NT4 do not support this level of FindFirst (and
retry with a lower infolevel)

Signed-off-by: Steve French (sfrench@us.ibm.com)
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/cifs/netmisc.c

@@ -206,7 +206,7 @@ static const struct {
 	{
 	ERRDOS, ERRgeneral, NT_STATUS_UNSUCCESSFUL}, {
 	ERRDOS, ERRbadfunc, NT_STATUS_NOT_IMPLEMENTED}, {
-	ERRDOS, 87, NT_STATUS_INVALID_INFO_CLASS}, {
+	ERRDOS, ERRinvlevel, NT_STATUS_INVALID_INFO_CLASS}, {
 	ERRDOS, 24, NT_STATUS_INFO_LENGTH_MISMATCH}, {
 	ERRHRD, ERRgeneral, NT_STATUS_ACCESS_VIOLATION}, {
 	ERRHRD, ERRgeneral, NT_STATUS_IN_PAGE_ERROR}, {

fs/cifs/readdir.c

@@ -323,6 +323,7 @@ static int initiate_cifs_search(const int xid, struct file *file)
 
 	cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
 
+ffirst_retry:
 	/* test for Unix extensions */
 	if (pTcon->ses->capabilities & CAP_UNIX) {
 		cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 
@@ -336,6 +337,11 @@ static int initiate_cifs_search(const int xid, struct file *file)
 		&cifsFile->netfid, &cifsFile->srch_inf); 
 	if(rc == 0)
 		cifsFile->invalidHandle = FALSE;
+	if((rc == -EOPNOTSUPP) && 
+		(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
+		goto ffirst_retry;
+	}
 	kfree(full_path);
 	return rc;
 }