ceph: unify inode i_ctime update

Current __ceph_setattr() can set inode's i_ctime to current_time(),
req->r_stamp or attr->ia_ctime. These time stamps may have minor
differences. It may cause potential problem.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index 987044b..59cb307 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -131,6 +131,7 @@ int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	}
 
 	if (new_mode != old_mode) {
+		newattrs.ia_ctime = current_time(inode);
 		newattrs.ia_mode = new_mode;
 		newattrs.ia_valid = ATTR_MODE;
 		ret = __ceph_setattr(inode, &newattrs);