Document MS_RELATIME, new in kernel 2.6.20.

diff --git a/man2/mount.2 b/man2/mount.2
index 729feec15d90f5487bdceb67155acba08c30e887..89a2e8bb39dd3d9d3ef8dc405c8cc30e5a92b3be 100644 (file)
--- a/man2/mount.2
+++ b/man2/mount.2
@@ -157,6 +157,15 @@ Mount file system read-only.
 .\" FIXME Document MS_REC, available since 2.4.11.
 .\" This flag has meaning in conjunction with MS_BIND and
 .\" also with the shared sub-tree flags.
+.TP 
+.BR MS_RELATIME "(Since Linux 2.6.20)"
+When a file on this file system is accessed,
+only update the file's last accessed time (atime) if the current value
+of atime is less than or equal to the file's last modified (mtime) 
+or last status change time (ctime).
+This option is useful for programs, such as
+.BR mutt (1),
+that need to know when a file has been read since it was last modified.
 .TP
 .B MS_REMOUNT
 Remount an existing mount.  This is allows you to change the
@@ -204,6 +213,9 @@ From kernel 2.6.16 onwards,
 and
 .B MS_NODIRATIME
 are also settable on a per-mount-point basis.
+The 
+.B MS_RELATIME 
+flag is also settable on a per-mount-point basis.
 .PP
 The
 .IR data