The patch titled
relative atime
has been added to the -mm tree. Its filename is
relative-atime.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: relative atime
From: Valerie Henson <val_henson@xxxxxxxxxxxxxxx>
Add "relatime" (relative atime) support. Relative atime only updates the
atime if the previous atime is older than the mtime or ctime. Like
noatime, but useful for applications like mutt that need to know when a
file has been read since it was last modified.
A corresponding patch against mount(8) is available at
http://userweb.kernel.org/~akpm/mount-relative-atime.txt
Signed-off-by: Valerie Henson <val_henson@xxxxxxxxxxxxxxx>
Cc: Mark Fasheh <mark.fasheh@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/inode.c | 22 ++++++++++++++++++----
fs/namespace.c | 5 ++++-
include/linux/fs.h | 1 +
include/linux/mount.h | 1 +
4 files changed, 24 insertions(+), 5 deletions(-)
diff -puN fs/inode.c~relative-atime fs/inode.c
--- a/fs/inode.c~relative-atime
+++ a/fs/inode.c
@@ -1177,13 +1177,27 @@ void touch_atime(struct vfsmount *mnt, s
return;
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))
return;
+
+ if (mnt->mnt_flags & MNT_RELATIME) {
+ /*
+ * With relative atime, only update atime if the
+ * previous atime is earlier than either the ctime or
+ * mtime.
+ */
+ if (timespec_compare(&inode->i_mtime,
+ &inode->i_atime) < 0 &&
+ timespec_compare(&inode->i_ctime,
+ &inode->i_atime) < 0)
+ return;
+ }
}
now = current_fs_time(inode->i_sb);
- if (!timespec_equal(&inode->i_atime, &now)) {
- inode->i_atime = now;
- mark_inode_dirty_sync(inode);
- }
+ if (timespec_equal(&inode->i_atime, &now))
+ return;
+
+ inode->i_atime = now;
+ mark_inode_dirty_sync(inode);
}
EXPORT_SYMBOL(touch_atime);
diff -puN fs/namespace.c~relative-atime fs/namespace.c
--- a/fs/namespace.c~relative-atime
+++ a/fs/namespace.c
@@ -368,6 +368,7 @@ static int show_vfsmnt(struct seq_file *
{ MNT_NOEXEC, ",noexec" },
{ MNT_NOATIME, ",noatime" },
{ MNT_NODIRATIME, ",nodiratime" },
+ { MNT_RELATIME, ",relatime" },
{ 0, NULL }
};
struct proc_fs_info *fs_infop;
@@ -1405,9 +1406,11 @@ long do_mount(char *dev_name, char *dir_
mnt_flags |= MNT_NOATIME;
if (flags & MS_NODIRATIME)
mnt_flags |= MNT_NODIRATIME;
+ if (flags & MS_RELATIME)
+ mnt_flags |= MNT_RELATIME;
flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
- MS_NOATIME | MS_NODIRATIME);
+ MS_NOATIME | MS_NODIRATIME | MS_RELATIME);
/* ... and get the mountpoint */
retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
diff -puN include/linux/fs.h~relative-atime include/linux/fs.h
--- a/include/linux/fs.h~relative-atime
+++ a/include/linux/fs.h
@@ -120,6 +120,7 @@ extern int dir_notify_enable;
#define MS_PRIVATE (1<<18) /* change to private */
#define MS_SLAVE (1<<19) /* change to slave */
#define MS_SHARED (1<<20) /* change to shared */
+#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
diff -puN include/linux/mount.h~relative-atime include/linux/mount.h
--- a/include/linux/mount.h~relative-atime
+++ a/include/linux/mount.h
@@ -27,6 +27,7 @@ struct namespace;
#define MNT_NOEXEC 0x04
#define MNT_NOATIME 0x08
#define MNT_NODIRATIME 0x10
+#define MNT_RELATIME 0x20
#define MNT_SHRINKABLE 0x100
_
Patches currently in -mm which might be from val_henson@xxxxxxxxxxxxxxx are
tulip-fix-shutdown-dma-irq-race.patch
tulip-fix-for-64-bit-mips.patch
tulip-natsemi-dp83840a-phy-fix.patch
touch_atime-cleanup.patch
relative-atime.patch
ext2-reservations.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
