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. [akpm: need reference to mount(8) patch] 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