ceph/ceph — pull request #2591 by majianpeng (2014-09-29 03:12:47+00:00)
Title: os/FileStore: using FIEMAP_FLAGS_SYNC instead of fsync() before call fiemap

When call fiemap, it need sync the file. Now it used fsync() to achieve
this. But for fiemap, there is a flag FIEMAP_FLAGS_SYNC which do the
same thing like fsync().

Signed-off-by: Jianpeng Ma