linux-kernel - Re: [patch] Relative atime

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Date:	Mon, 28 Aug 2006 17:14:37 -0700
From:	Valerie Henson <val_henson@...ux.intel.com>
To:	Josef Sipek <jsipek@....cs.sunysb.edu>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Akkana Peck <akkana@...llowsky.com>,
	Mark Fasheh <mark.fasheh@...cle.com>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Chris Wedgewood <cw@...f.org>, jsipek@...sunysb.edu,
	Al Viro <viro@....linux.org.uk>,
	Christoph Hellwig <hch@....de>, Adrian Bunk <bunk@...sta.de>
Subject: Re: [patch] Relative atime - userspace

On Mon, Aug 28, 2006 at 05:49:01PM -0400, Josef Sipek wrote:
> On Fri, Aug 25, 2006 at 04:56:19PM -0700, Valerie Henson wrote:
> >  #define MS_VERBOSE	0x8000	/* 32768 */
> ...
> > +#define MS_RELATIME   0x200000	/* 200000: Update access times relative
> 
> Just a small thing... 0x200000 != 200000

Just goes to show what my default base is... :)

Somehow "2097152: blah blah blah" just doesn't seem helpful - I just
removed it.  Fresh patch below.

-VAL

---
 mount/mount.8           |    7 +++++++
 mount/mount.c           |    6 ++++++
 mount/mount_constants.h |    4 ++++
 3 files changed, 17 insertions(+)

--- util-linux-2.13-pre7.orig/mount/mount.8
+++ util-linux-2.13-pre7/mount/mount.8
@@ -586,6 +586,13 @@ access on the news spool to speed up new
 .B nodiratime
 Do not update directory inode access times on this filesystem.
 .TP
+.B relatime
+Update inode access times relative to modify or change time.  Access
+time is only updated if the previous access time was earlier than the
+current modify or change time. (Similar to noatime, but doesn't break
+mutt or other applications that need to know if a file has been read
+since the last time it was modified.)
+.TP
 .B noauto
 Can only be mounted explicitly (i.e., the
 .B \-a
--- util-linux-2.13-pre7.orig/mount/mount.c
+++ util-linux-2.13-pre7/mount/mount.c
@@ -164,6 +164,12 @@ static const struct opt_map opt_map[] = 
   { "diratime",	0, 1, MS_NODIRATIME },	/* Update dir access times */
   { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
 #endif
+#ifdef MS_RELATIME
+  { "relatime", 0, 0, MS_RELATIME },	/* Update access times relative to
+					   mtime/ctime */
+  { "norelatime", 0, 1, MS_RELATIME },	/* Update access time without regard
+					   to mtime/ctime */
+#endif
   { NULL,	0, 0, 0		}
 };
 
--- util-linux-2.13-pre7.orig/mount/mount_constants.h
+++ util-linux-2.13-pre7/mount/mount_constants.h
@@ -57,6 +57,10 @@ if we have a stack or plain mount - moun
 #ifndef MS_VERBOSE
 #define MS_VERBOSE	0x8000	/* 32768 */
 #endif
+#ifndef MS_RELATIME
+#define MS_RELATIME   0x200000	/* Update access times relative
+				   to mtime/ctime */
+#endif
 /*
  * Magic mount flag number. Had to be or-ed to the flag values.
  */
-
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