Add NO_NTFS_DEVICE_DEFAULT_IO_OPS.

(Logical change 1.283)

include/ntfs/device_io.h

@@ -24,6 +24,8 @@
 
 #include "config.h"
 
+#ifndef NO_NTFS_DEVICE_DEFAULT_IO_OPS
+
 #ifndef __CYGWIN32__
 
 /* Not on Cygwin; use standard Unix style low level device operations. */
@@ -42,5 +44,7 @@ struct ntfs_device_operations;
 
 extern struct ntfs_device_operations ntfs_device_default_io_ops;
 
+#endif /* NO_NTFS_DEVICE_DEFAULT_IO_OPS */
+
 #endif /* defined _NTFS_DEVICE_IO_H */
 

libntfs/device_io.c

@@ -0,0 +1,38 @@
+/*
+ * device_io.c - Default device io operations. Part of the Linux-NTFS project.
+ *
+ * Copyright (c) 2003 Anton Altaparmakov
+ *
+ * This program/include file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program/include file is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (in the main directory of the Linux-NTFS
+ * distribution in the file COPYING); if not, write to the Free Software
+ * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#ifndef NO_NTFS_DEVICE_DEFAULT_IO_OPS
+
+#ifndef __CYGWIN32__
+
+/* Not on Cygwin; use standard Unix style low level device operations. */
+#include "unix_io.c"
+
+#else /* __CYGWIN32__ */
+
+/* On Cygwin; use Win32 low level device operations. */
+#include "win32_io.c"
+
+#endif /* __CYGWIN32__ */
+
+#endif /* NO_NTFS_DEVICE_DEFAULT_IO_OPS */

libntfs/volume.c

@@ -945,10 +945,20 @@ ntfs_volume *ntfs_mount(const char *name, unsigned long rwflag)
 {
 	struct ntfs_device *dev;
 
+#ifndef NO_NTFS_DEVICE_DEFAULT_IO_OPS
 	/* Allocate an ntfs_device structure. */
 	dev = ntfs_device_alloc(name, 0, &ntfs_device_default_io_ops, NULL);
 	if (!dev)
 		return NULL;
+#else
+	/*
+	 * ntfs_mount() makes no sense if NO_NTFS_DEVICE_DEFAULT_IO_OPS is
+	 * defined as there are no device operations available in libntfs in
+	 * this case.
+	 */
+	errno = ENOTSUP;
+	return NULL;
+#endif
 	/* Call ntfs_device_mount() to do the actual mount. */
 	return ntfs_device_mount(dev, rwflag);
 }