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-rw-r--r--mount/mount_constants.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/mount/mount_constants.h b/mount/mount_constants.h
index cdbced881..1eab36e03 100644
--- a/mount/mount_constants.h
+++ b/mount/mount_constants.h
@@ -19,6 +19,10 @@
#ifndef MS_MANDLOCK
#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
#endif
+#ifndef MS_DIRSYNC
+#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
+#endif
+
#ifndef MS_ACTION_MASK
#define MS_ACTION_MASK 0x380
/* Remount, but new filesystem may be different from old. Atomic