nfs41: clear NFS_LAYOUT_RETURN if layoutreturn is sent or failed to send

So that pnfs path is not disabled for ever.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <Thomas.Haynes@primarydata.com>

fs/nfs/nfs4proc.c

@@ -7796,6 +7796,7 @@ static void nfs4_layoutreturn_release(void *calldata)
 	spin_lock(&lo->plh_inode->i_lock);
 	if (lrp->res.lrs_present)
 		pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
+	clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
 	lo->plh_block_lgets--;
 	spin_unlock(&lo->plh_inode->i_lock);
 	pnfs_put_layout_hdr(lrp->args.layout);

fs/nfs/pnfs.c

@@ -921,6 +921,11 @@ pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
 
 	status = nfs4_proc_layoutreturn(lrp);
 out:
+	if (status) {
+		spin_lock(&ino->i_lock);
+		clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
+		spin_unlock(&ino->i_lock);
+	}
 	dprintk("<-- %s status: %d\n", __func__, status);
 	return status;
 }