On Tue, Dec 04, 2012 at 01:56:39AM +0800, yangsheng wrote:

Relatime should update the inode atime if it is more than a day in the
future.  The original problem seen was a tarball that had a bad atime,
but could also happen if someone fat-fingers a "touch".  The future
atime will never be fixed.  Before the relatime patch, the future atime
would be updated back to the current time on the next access.

So if someone accidentally changes time back a few days, access
times go backwards for everything? That doesn't sound right to me -
it's going to seriously screw up backups and other scanners that use
atime to determine "newly accessed files"....

IMO, if you fat-finger a manual atime update or use atimes direct
from tarballs, then that's your problem as a user and not the
responsibility of the kernel to magically fix for you....

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com