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Commit d025fbf1 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'nfs-for-4.15-3' of git://git.linux-nfs.org/projects/anna/linux-nfs 

Pull NFS client fixes from Anna Schumaker:
 "This has two stable bugfixes, one to fix a BUG_ON() when
  nfs_commit_inode() is called with no outstanding commit requests and
  another to fix a race in the SUNRPC receive codepath.

  Additionally, there are also fixes for an NFS client deadlock and an
  xprtrdma performance regression.

  Summary:

  Stable bugfixes:
   - NFS: Avoid a BUG_ON() in nfs_commit_inode() by not waiting for a
     commit in the case that there were no commit requests.
   - SUNRPC: Fix a race in the receive code path

  Other fixes:
   - NFS: Fix a deadlock in nfs client initialization
   - xprtrdma: Fix a performance regression for small IOs"

* tag 'nfs-for-4.15-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  SUNRPC: Fix a race in the receive code path
  nfs: don't wait on commit in nfs_commit_inode() if there were no commit requests
  xprtrdma: Spread reply processing over more CPUs
  nfs: fix a deadlock in nfs client initialization
parents f6f37321 90d91b0c

fs/nfs/client.c

+11 −0
Original line number Diff line number Diff line
@@ -291,12 +291,23 @@ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *dat 
	const struct sockaddr *sap = data->addr;

	struct nfs_net *nn = net_generic(data->net, nfs_net_id);



again:

	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {

	        const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

		/* Don't match clients that failed to initialise properly */

		if (clp->cl_cons_state < 0)

			continue;



		/* If a client is still initializing then we need to wait */

		if (clp->cl_cons_state > NFS_CS_READY) {

			refcount_inc(&clp->cl_count);

			spin_unlock(&nn->nfs_client_lock);

			nfs_wait_client_init_complete(clp);

			nfs_put_client(clp);

			spin_lock(&nn->nfs_client_lock);

			goto again;

		}



		/* Different NFS versions cannot share the same nfs_client */

		if (clp->rpc_ops != data->nfs_mod->rpc_ops)

			continue;

fs/nfs/nfs4client.c

+13 −4
Original line number Diff line number Diff line
@@ -404,15 +404,19 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp, 
	if (error < 0)

		goto error;



	if (!nfs4_has_session(clp))

		nfs_mark_client_ready(clp, NFS_CS_READY);



	error = nfs4_discover_server_trunking(clp, &old);

	if (error < 0)

		goto error;



	if (clp != old)

	if (clp != old) {

		clp->cl_preserve_clid = true;

		/*

		 * Mark the client as having failed initialization so other

		 * processes walking the nfs_client_list in nfs_match_client()

		 * won't try to use it.

		 */

		nfs_mark_client_ready(clp, -EPERM);

	}

	nfs_put_client(clp);

	clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);

	return old;
@@ -539,6 +543,9 @@ int nfs40_walk_client_list(struct nfs_client *new, 
	spin_lock(&nn->nfs_client_lock);

	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {



		if (pos == new)

			goto found;



		status = nfs4_match_client(pos, new, &prev, nn);

		if (status < 0)

			goto out_unlock;
@@ -559,6 +566,7 @@ int nfs40_walk_client_list(struct nfs_client *new, 
		 * way that a SETCLIENTID_CONFIRM to pos can succeed is

		 * if new and pos point to the same server:

		 */

found:

		refcount_inc(&pos->cl_count);

		spin_unlock(&nn->nfs_client_lock);
@@ -572,6 +580,7 @@ int nfs40_walk_client_list(struct nfs_client *new, 
		case 0:

			nfs4_swap_callback_idents(pos, new);

			pos->cl_confirm = new->cl_confirm;

			nfs_mark_client_ready(pos, NFS_CS_READY);



			prev = NULL;

			*result = pos;

fs/nfs/write.c

+2 −0
Original line number Diff line number Diff line
@@ -1890,6 +1890,8 @@ int nfs_commit_inode(struct inode *inode, int how) 
	if (res)

		error = nfs_generic_commit_list(inode, &head, how, &cinfo);

	nfs_commit_end(cinfo.mds);

	if (res == 0)

		return res;

	if (error < 0)

		goto out_error;

	if (!may_wait)

net/sunrpc/xprt.c

+19 −9
Original line number Diff line number Diff line
@@ -1001,6 +1001,7 @@ void xprt_transmit(struct rpc_task *task) 
{

	struct rpc_rqst	*req = task->tk_rqstp;

	struct rpc_xprt	*xprt = req->rq_xprt;

	unsigned int connect_cookie;

	int status, numreqs;



	dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
@@ -1024,6 +1025,7 @@ void xprt_transmit(struct rpc_task *task) 
	} else if (!req->rq_bytes_sent)

		return;



	connect_cookie = xprt->connect_cookie;

	req->rq_xtime = ktime_get();

	status = xprt->ops->send_request(task);

	trace_xprt_transmit(xprt, req->rq_xid, status);
@@ -1047,20 +1049,28 @@ void xprt_transmit(struct rpc_task *task) 
	xprt->stat.bklog_u += xprt->backlog.qlen;

	xprt->stat.sending_u += xprt->sending.qlen;

	xprt->stat.pending_u += xprt->pending.qlen;

	spin_unlock_bh(&xprt->transport_lock);



	/* Don't race with disconnect */

	if (!xprt_connected(xprt))

		task->tk_status = -ENOTCONN;

	else {

	req->rq_connect_cookie = connect_cookie;

	if (rpc_reply_expected(task) && !READ_ONCE(req->rq_reply_bytes_recvd)) {

		/*

		 * Sleep on the pending queue since

		 * we're expecting a reply.

		 * Sleep on the pending queue if we're expecting a reply.

		 * The spinlock ensures atomicity between the test of

		 * req->rq_reply_bytes_recvd, and the call to rpc_sleep_on().

		 */

		if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task))

		spin_lock(&xprt->recv_lock);

		if (!req->rq_reply_bytes_recvd) {

			rpc_sleep_on(&xprt->pending, task, xprt_timer);

		req->rq_connect_cookie = xprt->connect_cookie;

			/*

			 * Send an extra queue wakeup call if the

			 * connection was dropped in case the call to

			 * rpc_sleep_on() raced.

			 */

			if (!xprt_connected(xprt))

				xprt_wake_pending_tasks(xprt, -ENOTCONN);

		}

		spin_unlock(&xprt->recv_lock);

	}

	spin_unlock_bh(&xprt->transport_lock);

}



static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task)

net/sunrpc/xprtrdma/rpc_rdma.c

+1 −5
Original line number Diff line number Diff line
@@ -1408,11 +1408,7 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep) 
	dprintk("RPC:       %s: reply %p completes request %p (xid 0x%08x)\n",

		__func__, rep, req, be32_to_cpu(rep->rr_xid));



	if (list_empty(&req->rl_registered) &&

	    !test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags))

		rpcrdma_complete_rqst(rep);

	else

		queue_work(rpcrdma_receive_wq, &rep->rr_work);

	queue_work_on(req->rl_cpu, rpcrdma_receive_wq, &rep->rr_work);

	return;



out_badstatus: