util-linux: Add new mount options flushonfsync and noflushonfsyncto mount

[Fernando Luis Vázquez Cao]

This mount flag will be used to determine whether the block device's write
cache should be flush or not on fsync()/fdatasync().

Signed-off-by: Fernando Luis Vazquez Cao <fernando@xxxxxxxxxxxxx>
---

diff -urp mount-orig/mount.c mount/mount.c
--- mount-orig/mount.c	2009-01-29 15:50:50.000000000 +0900
+++ mount/mount.c	2009-01-29 14:56:19.000000000 +0900
@@ -185,6 +185,13 @@ static const struct opt_map opt_map[] = 
   { "norelatime", 0, 1, MS_RELATIME }, /* Update access time without regard
 					  to mtime/ctime */
 #endif
+#ifdef MS_FLUSHONFSYNC
+  { "flushonfsync", 0, 0, MS_FLUSHONFSYNC },	/* Force block device flush on
+						   fsync()/fdatasync() */
+  { "noflushonfsync", 0, 1, MS_FLUSHONFSYNC },	/* Do not force block device
+						   flush on
+						   fsync()/fdatasync() */
+#endif
   { "nofail",	0, 0, MS_COMMENT},	/* Do not fail if ENOENT on dev */
   { NULL,	0, 0, 0		}
 };
diff -urp mount-orig/mount_constants.h mount/mount_constants.h
--- mount-orig/mount_constants.h	2008-04-22 17:59:53.000000000 +0900
+++ mount/mount_constants.h	2009-01-29 13:40:42.000000000 +0900
@@ -56,6 +56,10 @@
 #ifndef MS_SHARED
 #define MS_SHARED	(1<<20)	/* 1048576 Shared*/
 #endif
+#ifndef MS_FLUSHONFSYNC
+#define MS_FLUSHONFSYNC	(1<<24) /* Force block device flush on
+				   fsync()/fdatasync() */
+#endif
 /*
  * Magic mount flag number. Had to be or-ed to the flag values.
  */


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