pNFS/files: Fix layoutcommit after a commit to DS

BugLink: http://bugs.launchpad.net/bugs/1631468

commit 73e6c5d8 upstream.

According to the errata
https://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
we should always send layout commit after a commit to DS.

Fixes: bc7d4b8f ("nfs/filelayout: set layoutcommit...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

fs/nfs/filelayout/filelayout.c

@@ -374,7 +374,6 @@ static int filelayout_commit_done_cb(struct rpc_task *task,
 		return -EAGAIN;
 	}
 
-	if (data->verf.committed == NFS_UNSTABLE)
 	pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
 
 	return 0;