ceph: use getattr request to fetch inline data

Add a new parameter 'locked_page' to ceph_do_getattr(). If inline data
in getattr reply will be copied to the page.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

diff --cc fs/ceph/inode.c
Simple merge

diff --cc fs/ceph/mds_client.h
Simple merge

diff --cc fs/ceph/super.h
Simple merge

diff --cc include/linux/ceph/ceph_fs.h
Simple merge