renamer() method now does a fsync on containing directory of target path
and also on parent dirs of newly created directories, by default.
This can be explicitly turned off in cases where it is not
necessary (For example- quarantines).
The following article explains why this is necessary:
http://lwn.net/Articles/457667/
Although, it may seem like the right thing to do, this change does come
at a performance penalty. However, no configurable option is provided to
turn it off.
Also, lock_path() inside invalidate_hash() was always creating part of
object path in filesystem. Those are never fsync'd. This has been
fixed.
Change-Id: Id8e02f84f48370edda7fb0c46e030db3b53a71e3
Signed-off-by: Prashanth Pai <ppai@redhat.com>
a6f630f27c