NTFS: Change the mount options {u,f,d}mask to always parse the number as

an octal number to conform to how chmod(1) works, too.  Thanks to
      Giuseppe Bilotta and Horst von Brand for pointing out the errors of
      my ways.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

fs/ntfs/super.c

@@ -126,6 +126,14 @@ static BOOL parse_options(ntfs_volume *vol, char *opt)
 		if (*v)							\
 			goto needs_val;					\
 	}
+#define NTFS_GETOPT_OCTAL(option, variable)				\
+	if (!strcmp(p, option)) {					\
+		if (!v || !*v)						\
+			goto needs_arg;					\
+		variable = simple_strtoul(ov = v, &v, 8);		\
+		if (*v)							\
+			goto needs_val;					\
+	}
 #define NTFS_GETOPT_BOOL(option, variable)				\
 	if (!strcmp(p, option)) {					\
 		BOOL val;						\
@@ -157,9 +165,9 @@ static BOOL parse_options(ntfs_volume *vol, char *opt)
 			*v++ = 0;
 		NTFS_GETOPT("uid", uid)
 		else NTFS_GETOPT("gid", gid)
-		else NTFS_GETOPT("umask", fmask = dmask)
-		else NTFS_GETOPT("fmask", fmask)
-		else NTFS_GETOPT("dmask", dmask)
+		else NTFS_GETOPT_OCTAL("umask", fmask = dmask)
+		else NTFS_GETOPT_OCTAL("fmask", fmask)
+		else NTFS_GETOPT_OCTAL("dmask", dmask)
 		else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier)
 		else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE)
 		else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files)