From: Matthew Garrett <mjg59@srcf.ucam.org>
Date: Fri, 27 Mar 2009 00:47:22 +0000 (+0000)
Subject: mount: Add strictatime support
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed64b8d0fc945ce49041f313c453b6b21d68b832;p=util-linux

mount: Add strictatime support

2.6.30 adds (patch d0adde574b8487ef30f69e2d08bba769e4be513f) support for a
strictatime mount parameter, used to request strict atime update semantics. The
following patch adds support for it to mount.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
---

diff --git a/mount/mount.8 b/mount/mount.8
index e3eb8104..8da67689 100644
--- a/mount/mount.8
+++ b/mount/mount.8
@@ -807,6 +807,13 @@ Do not use
 feature (e.g, for systems where the feature is enabled by default, for
 more details see mount options in /proc/mounts).
 .TP
+.B strictatime
+Update inode access times whenever a file is accessed. Disables noatime and
+.B relatime.
+.TP
+.B nostrictatime
+Use the kernel's default behaviour for inode access time updates.
+.TP
 .B suid
 Allow set-user-identifier or set-group-identifier bits to take
 effect.
diff --git a/mount/mount.c b/mount/mount.c
index 94fa94fb..f48f9d40 100644
--- a/mount/mount.c
+++ b/mount/mount.c
@@ -187,6 +187,10 @@ static const struct opt_map opt_map[] = {
 					  mtime/ctime */
   { "norelatime", 0, 1, MS_RELATIME }, /* Update access time without regard
 					  to mtime/ctime */
+#endif
+#ifdef MS_STRICTATIME
+  { "strictatime", 0, 0, MS_STRICTATIME }, /* Strict atime semantics */
+  { "nostrictatime", 0, 1, MS_STRICTATIME }, /* kernel default atime */
 #endif
   { "nofail",	0, 0, MS_COMMENT},	/* Do not fail if ENOENT on dev */
   { NULL,	0, 0, 0		}
diff --git a/mount/mount_constants.h b/mount/mount_constants.h
index 41311c05..81686f1d 100644
--- a/mount/mount_constants.h
+++ b/mount/mount_constants.h
@@ -59,6 +59,9 @@
 #ifndef MS_I_VERSION
 #define MS_I_VERSION	(1<<23)	/* update inode I_version field */
 #endif
+#ifndef MS_STRICTATIME
+#define MS_STRICTATIME	(1<<24) /* strict atime semantics */
+#endif
 /*
  * Magic mount flag number. Had to be or-ed to the flag values.
  */