ceph: do not chain inode updates to parent fsync

The fsync(dirfd) only covers namespace operations, not inode updates.
We do not need to cover setattr variants or O_TRUNC.

Reported-by: Al Viro <viro@xeniv.linux.org.uk>
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 09c7afe..c298a7b 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -210,7 +210,7 @@
 	ihold(inode);
 
 	req->r_num_caps = 1;
-	if (flags & (O_CREAT|O_TRUNC))
+	if (flags & O_CREAT)
 		parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 	err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 	iput(parent_inode);