ceph/ceph — pull request #2817 by majianpeng (2014-10-28 06:58:40+00:00)
Title: WBThrottle: Call posix_fadvise to free page cache if nocache set in clear()

Because FileStore will sync fs and call clear() to clear all pending
ghobjct. So in clear(), the pending object can free the page cache if
nocache is set.
Signed-off-by: Jianpeng Ma