Commit 5c441544 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4.x: Handle bad/dead sessions correctly in nfs41_sequence_process() 



If the server returns a bad or dead session error, the we don't want
to update the session slot number, but just immediately schedule
recovery and allow it to proceed.

We can/should then remove handling in other places

Fixes: 3453d570 ("NFSv4.1: Avoid false retries when RPC calls are interrupted")
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 634d811c

fs/nfs/nfs4proc.c

+25 −9
Original line number Diff line number Diff line
@@ -521,9 +521,7 @@ static int nfs4_do_handle_exception(struct nfs_server *server, 
		case -NFS4ERR_DEADSESSION:

		case -NFS4ERR_SEQ_FALSE_RETRY:

		case -NFS4ERR_SEQ_MISORDERED:

			dprintk("%s ERROR: %d Reset session\n", __func__,

				errorcode);

			nfs4_schedule_session_recovery(clp->cl_session, errorcode);

			/* Handled in nfs41_sequence_process() */

			goto wait_on_recovery;

#endif /* defined(CONFIG_NFS_V4_1) */

		case -NFS4ERR_FILE_OPEN:
@@ -782,6 +780,7 @@ static int nfs41_sequence_process(struct rpc_task *task, 
	struct nfs4_session *session;

	struct nfs4_slot *slot = res->sr_slot;

	struct nfs_client *clp;

	int status;

	int ret = 1;



	if (slot == NULL)
@@ -793,8 +792,13 @@ static int nfs41_sequence_process(struct rpc_task *task, 
	session = slot->table->session;



	trace_nfs4_sequence_done(session, res);



	status = res->sr_status;

	if (task->tk_status == -NFS4ERR_DEADSESSION)

		status = -NFS4ERR_DEADSESSION;



	/* Check the SEQUENCE operation status */

	switch (res->sr_status) {

	switch (status) {

	case 0:

		/* Mark this sequence number as having been acked */

		nfs4_slot_sequence_acked(slot, slot->seq_nr);
@@ -866,6 +870,10 @@ static int nfs41_sequence_process(struct rpc_task *task, 
		 */

		slot->seq_nr = slot->seq_nr_highest_sent;

		goto out_retry;

	case -NFS4ERR_BADSESSION:

	case -NFS4ERR_DEADSESSION:

	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:

		goto session_recover;

	default:

		/* Just update the slot sequence no. */

		slot->seq_done = 1;
@@ -876,8 +884,10 @@ out: 
out_noaction:

	return ret;

session_recover:

	nfs4_schedule_session_recovery(session, res->sr_status);

	goto retry_nowait;

	nfs4_schedule_session_recovery(session, status);

	dprintk("%s ERROR: %d Reset session\n", __func__, status);

	nfs41_sequence_free_slot(res);

	goto out;

retry_new_seq:

	++slot->seq_nr;

retry_nowait:
@@ -2188,7 +2198,6 @@ static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct 
		case -NFS4ERR_BAD_HIGH_SLOT:

		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:

		case -NFS4ERR_DEADSESSION:

			nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);

			return -EAGAIN;

		case -NFS4ERR_STALE_CLIENTID:

		case -NFS4ERR_STALE_STATEID:
@@ -7824,6 +7833,15 @@ nfs41_same_server_scope(struct nfs41_server_scope *a, 
static void

nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)

{

	struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;

	struct nfs_client *clp = args->client;



	switch (task->tk_status) {

	case -NFS4ERR_BADSESSION:

	case -NFS4ERR_DEADSESSION:

		nfs4_schedule_session_recovery(clp->cl_session,

				task->tk_status);

	}

}



static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
@@ -8871,8 +8889,6 @@ static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nf 
	case -NFS4ERR_BADSESSION:

	case -NFS4ERR_DEADSESSION:

	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:

		nfs4_schedule_session_recovery(clp->cl_session,

				task->tk_status);

		break;

	default:

		nfs4_schedule_lease_recovery(clp);

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