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[PATCH] relative atime

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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@linux.intel.com>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Karel Zak <kzak@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Valerie Henson
2006-12-13 00:34:34 -08:00
committed by Linus Torvalds
parent b227613841
commit 47ae32d6a5
4 changed files with 24 additions and 5 deletions
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22
fs/inode.c
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@@ -1177,13 +1177,27 @@ void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
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);