ceph/ceph — pull request #2725 by CzBiX (2014-10-15 08:37:15+00:00)
Title: rgw: correct "If-Modified-Since" handle.

Normally client will use `Last-Modified` of server returned, as the
value of `If-Modified-Since`. So the `ctime` is exactly equal to
`*mod_ptr`, and rgw should return `Not Modified`, otherwise the cache
will never worked.

Signed-off-by: VRan Liu