NFSv4.1: Handle BAD_STATEID and EXPIRED errors in layoutget

If the layoutget call returns a stateid error, we want to invalidate the
layout stateid, and/or recover the open stateid.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -6272,26 +6272,44 @@ nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
 {
 	struct nfs4_layoutget *lgp = calldata;
-	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+	struct inode *inode = lgp->args.inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct pnfs_layout_hdr *lo;
+	struct nfs4_state *state = NULL;
 
 	dprintk("--> %s\n", __func__);
 
 	if (!nfs4_sequence_done(task, &lgp->res.seq_res))
-		return;
+		goto out;
 
 	switch (task->tk_status) {
 	case 0:
-		break;
+		goto out;
 	case -NFS4ERR_LAYOUTTRYLATER:
 	case -NFS4ERR_RECALLCONFLICT:
 		task->tk_status = -NFS4ERR_DELAY;
-		/* Fall through */
-	default:
-		if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
-			rpc_restart_call_prepare(task);
-			return;
+		break;
+	case -NFS4ERR_EXPIRED:
+	case -NFS4ERR_BAD_STATEID:
+		spin_lock(&inode->i_lock);
+		lo = NFS_I(inode)->layout;
+		if (!lo || list_empty(&lo->plh_segs)) {
+			spin_unlock(&inode->i_lock);
+			/* If the open stateid was bad, then recover it. */
+			state = lgp->args.ctx->state;
+		} else {
+			LIST_HEAD(head);
+
+			pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
+			spin_unlock(&inode->i_lock);
+			/* Mark the bad layout state as invalid, then
+			 * retry using the open stateid. */
+			pnfs_free_lseg_list(&head);
 		}
 	}
+	if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
+		rpc_restart_call_prepare(task);
+out:
 	dprintk("<-- %s\n", __func__);
 }