nfs4state.c 48.9 KB
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/*
 *  fs/nfs/nfs4state.c
 *
 *  Client-side XDR for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Implementation of the NFSv4 state model.  For the time being,
 * this is minimal, but will be made much more complex in a
 * subsequent patch.
 */

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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/nfs_fs.h>
#include <linux/nfs_idmap.h>
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#include <linux/kthread.h>
#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/ratelimit.h>
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#include <linux/workqueue.h>
#include <linux/bitops.h>
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#include <linux/jiffies.h>
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#include "nfs4_fs.h"
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#include "callback.h"
#include "delegation.h"
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#include "internal.h"
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#include "pnfs.h"
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#define NFSDBG_FACILITY		NFSDBG_STATE

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#define OPENOWNER_POOL_SIZE	8

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const nfs4_stateid zero_stateid;
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static LIST_HEAD(nfs4_clientid_list);

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int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
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{
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	struct nfs4_setclientid_res clid = {
		.clientid = clp->cl_clientid,
		.confirm = clp->cl_confirm,
	};
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	unsigned short port;
	int status;

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	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
		goto do_confirm;
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	port = nfs_callback_tcpport;
	if (clp->cl_addr.ss_family == AF_INET6)
		port = nfs_callback_tcpport6;

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	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
	if (status != 0)
		goto out;
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	clp->cl_clientid = clid.clientid;
	clp->cl_confirm = clid.confirm;
	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
do_confirm:
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	status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
	if (status != 0)
		goto out;
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	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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	nfs4_schedule_state_renewal(clp);
out:
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	return status;
}

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struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
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{
	struct rpc_cred *cred = NULL;

	if (clp->cl_machine_cred != NULL)
		cred = get_rpccred(clp->cl_machine_cred);
	return cred;
}

static void nfs4_clear_machine_cred(struct nfs_client *clp)
{
	struct rpc_cred *cred;

	spin_lock(&clp->cl_lock);
	cred = clp->cl_machine_cred;
	clp->cl_machine_cred = NULL;
	spin_unlock(&clp->cl_lock);
	if (cred != NULL)
		put_rpccred(cred);
}

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static struct rpc_cred *
nfs4_get_renew_cred_server_locked(struct nfs_server *server)
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{
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	struct rpc_cred *cred = NULL;
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	struct nfs4_state_owner *sp;
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	struct rb_node *pos;
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	for (pos = rb_first(&server->state_owners);
	     pos != NULL;
	     pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
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		if (list_empty(&sp->so_states))
			continue;
		cred = get_rpccred(sp->so_cred);
		break;
	}
	return cred;
}

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/**
 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
 * @clp: client state handle
 *
 * Returns an rpc_cred with reference count bumped, or NULL.
 * Caller must hold clp->cl_lock.
 */
struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
{
	struct rpc_cred *cred = NULL;
	struct nfs_server *server;

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	/* Use machine credentials if available */
	cred = nfs4_get_machine_cred_locked(clp);
	if (cred != NULL)
		goto out;

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	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		cred = nfs4_get_renew_cred_server_locked(server);
		if (cred != NULL)
			break;
	}
	rcu_read_unlock();
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out:
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	return cred;
}

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#if defined(CONFIG_NFS_V4_1)

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static int nfs41_setup_state_renewal(struct nfs_client *clp)
{
	int status;
	struct nfs_fsinfo fsinfo;

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	if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
		nfs4_schedule_state_renewal(clp);
		return 0;
	}

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	status = nfs4_proc_get_lease_time(clp, &fsinfo);
	if (status == 0) {
		/* Update lease time and schedule renewal */
		spin_lock(&clp->cl_lock);
		clp->cl_lease_time = fsinfo.lease_time * HZ;
		clp->cl_last_renewal = jiffies;
		spin_unlock(&clp->cl_lock);

		nfs4_schedule_state_renewal(clp);
	}

	return status;
}

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/*
 * Back channel returns NFS4ERR_DELAY for new requests when
 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
 * is ended.
 */
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static void nfs4_end_drain_session(struct nfs_client *clp)
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{
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	struct nfs4_session *ses = clp->cl_session;
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	struct nfs4_slot_table *tbl;
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	int max_slots;

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	if (ses == NULL)
		return;
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	tbl = &ses->fc_slot_table;
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	if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
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		spin_lock(&tbl->slot_tbl_lock);
		max_slots = tbl->max_slots;
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		while (max_slots--) {
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			if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
						nfs4_set_task_privileged,
						NULL) == NULL)
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				break;
		}
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		spin_unlock(&tbl->slot_tbl_lock);
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	}
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}

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static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
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{
	spin_lock(&tbl->slot_tbl_lock);
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	if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
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		INIT_COMPLETION(tbl->complete);
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		spin_unlock(&tbl->slot_tbl_lock);
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		return wait_for_completion_interruptible(&tbl->complete);
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	}
	spin_unlock(&tbl->slot_tbl_lock);
	return 0;
}

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static int nfs4_begin_drain_session(struct nfs_client *clp)
{
	struct nfs4_session *ses = clp->cl_session;
	int ret = 0;

	set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
	/* back channel */
	ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
	if (ret)
		return ret;
	/* fore channel */
	return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
}

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int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
{
	int status;

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	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
		goto do_confirm;
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	nfs4_begin_drain_session(clp);
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	status = nfs4_proc_exchange_id(clp, cred);
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	if (status != 0)
		goto out;
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	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
do_confirm:
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	status = nfs4_proc_create_session(clp);
	if (status != 0)
		goto out;
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	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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	nfs41_setup_state_renewal(clp);
	nfs_mark_client_ready(clp, NFS_CS_READY);
out:
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	return status;
}

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struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
{
	struct rpc_cred *cred;

	spin_lock(&clp->cl_lock);
	cred = nfs4_get_machine_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
	return cred;
}

#endif /* CONFIG_NFS_V4_1 */

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static struct rpc_cred *
nfs4_get_setclientid_cred_server(struct nfs_server *server)
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{
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	struct nfs_client *clp = server->nfs_client;
	struct rpc_cred *cred = NULL;
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	struct nfs4_state_owner *sp;
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	struct rb_node *pos;
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	spin_lock(&clp->cl_lock);
	pos = rb_first(&server->state_owners);
	if (pos != NULL) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
		cred = get_rpccred(sp->so_cred);
	}
	spin_unlock(&clp->cl_lock);
	return cred;
}

/**
 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
 * @clp: client state handle
 *
 * Returns an rpc_cred with reference count bumped, or NULL.
 */
struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
{
	struct nfs_server *server;
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	struct rpc_cred *cred;
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	spin_lock(&clp->cl_lock);
	cred = nfs4_get_machine_cred_locked(clp);
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	spin_unlock(&clp->cl_lock);
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	if (cred != NULL)
		goto out;
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	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		cred = nfs4_get_setclientid_cred_server(server);
		if (cred != NULL)
			break;
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	}
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	rcu_read_unlock();

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out:
	return cred;
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}

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static struct nfs4_state_owner *
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nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
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{
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	struct rb_node **p = &server->state_owners.rb_node,
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		       *parent = NULL;
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	struct nfs4_state_owner *sp;
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	while (*p != NULL) {
		parent = *p;
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		sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
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		if (cred < sp->so_cred)
			p = &parent->rb_left;
		else if (cred > sp->so_cred)
			p = &parent->rb_right;
		else {
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			if (!list_empty(&sp->so_lru))
				list_del_init(&sp->so_lru);
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			atomic_inc(&sp->so_count);
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			return sp;
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		}
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	}
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	return NULL;
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}

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static struct nfs4_state_owner *
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nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
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{
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	struct nfs_server *server = new->so_server;
	struct rb_node **p = &server->state_owners.rb_node,
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		       *parent = NULL;
	struct nfs4_state_owner *sp;
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	int err;
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	while (*p != NULL) {
		parent = *p;
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		sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
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		if (new->so_cred < sp->so_cred)
			p = &parent->rb_left;
		else if (new->so_cred > sp->so_cred)
			p = &parent->rb_right;
		else {
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			if (!list_empty(&sp->so_lru))
				list_del_init(&sp->so_lru);
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			atomic_inc(&sp->so_count);
			return sp;
		}
	}
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	err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
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	if (err)
		return ERR_PTR(err);
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	rb_link_node(&new->so_server_node, parent, p);
	rb_insert_color(&new->so_server_node, &server->state_owners);
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	return new;
}

static void
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nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
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{
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	struct nfs_server *server = sp->so_server;

	if (!RB_EMPTY_NODE(&sp->so_server_node))
		rb_erase(&sp->so_server_node, &server->state_owners);
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	ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
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}

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static void
nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
{
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	sc->create_time = ktime_get();
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	sc->flags = 0;
	sc->counter = 0;
	spin_lock_init(&sc->lock);
	INIT_LIST_HEAD(&sc->list);
	rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
}

static void
nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
{
	rpc_destroy_wait_queue(&sc->wait);
}

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/*
 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 * create a new state_owner.
 *
 */
static struct nfs4_state_owner *
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nfs4_alloc_state_owner(struct nfs_server *server,
		struct rpc_cred *cred,
		gfp_t gfp_flags)
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{
	struct nfs4_state_owner *sp;

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	sp = kzalloc(sizeof(*sp), gfp_flags);
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	if (!sp)
		return NULL;
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	sp->so_server = server;
	sp->so_cred = get_rpccred(cred);
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	spin_lock_init(&sp->so_lock);
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	INIT_LIST_HEAD(&sp->so_states);
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	nfs4_init_seqid_counter(&sp->so_seqid);
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	atomic_set(&sp->so_count, 1);
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	INIT_LIST_HEAD(&sp->so_lru);
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	return sp;
}

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static void
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nfs4_drop_state_owner(struct nfs4_state_owner *sp)
{
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	struct rb_node *rb_node = &sp->so_server_node;

	if (!RB_EMPTY_NODE(rb_node)) {
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		struct nfs_server *server = sp->so_server;
		struct nfs_client *clp = server->nfs_client;
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		spin_lock(&clp->cl_lock);
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		if (!RB_EMPTY_NODE(rb_node)) {
			rb_erase(rb_node, &server->state_owners);
			RB_CLEAR_NODE(rb_node);
		}
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		spin_unlock(&clp->cl_lock);
	}
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}

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static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
{
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	nfs4_destroy_seqid_counter(&sp->so_seqid);
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	put_rpccred(sp->so_cred);
	kfree(sp);
}

static void nfs4_gc_state_owners(struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;
	struct nfs4_state_owner *sp, *tmp;
	unsigned long time_min, time_max;
	LIST_HEAD(doomed);

	spin_lock(&clp->cl_lock);
	time_max = jiffies;
	time_min = (long)time_max - (long)clp->cl_lease_time;
	list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
		/* NB: LRU is sorted so that oldest is at the head */
		if (time_in_range(sp->so_expires, time_min, time_max))
			break;
		list_move(&sp->so_lru, &doomed);
		nfs4_remove_state_owner_locked(sp);
	}
	spin_unlock(&clp->cl_lock);

	list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
		list_del(&sp->so_lru);
		nfs4_free_state_owner(sp);
	}
}

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/**
 * nfs4_get_state_owner - Look up a state owner given a credential
 * @server: nfs_server to search
 * @cred: RPC credential to match
 *
 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
 */
struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
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					      struct rpc_cred *cred,
					      gfp_t gfp_flags)
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{
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	struct nfs_client *clp = server->nfs_client;
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	struct nfs4_state_owner *sp, *new;

	spin_lock(&clp->cl_lock);
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	sp = nfs4_find_state_owner_locked(server, cred);
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	spin_unlock(&clp->cl_lock);
	if (sp != NULL)
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		goto out;
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	new = nfs4_alloc_state_owner(server, cred, gfp_flags);
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	if (new == NULL)
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		goto out;
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	do {
		if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
			break;
		spin_lock(&clp->cl_lock);
		sp = nfs4_insert_state_owner_locked(new);
		spin_unlock(&clp->cl_lock);
	} while (sp == ERR_PTR(-EAGAIN));
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	if (sp != new)
		nfs4_free_state_owner(new);
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out:
	nfs4_gc_state_owners(server);
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	return sp;
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}

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/**
 * nfs4_put_state_owner - Release a nfs4_state_owner
 * @sp: state owner data to release
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 *
 * Note that we keep released state owners on an LRU
 * list.
 * This caches valid state owners so that they can be
 * reused, to avoid the OPEN_CONFIRM on minor version 0.
 * It also pins the uniquifier of dropped state owners for
 * a while, to ensure that those state owner names are
 * never reused.
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 */
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void nfs4_put_state_owner(struct nfs4_state_owner *sp)
{
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	struct nfs_server *server = sp->so_server;
	struct nfs_client *clp = server->nfs_client;
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	if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
		return;
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	sp->so_expires = jiffies;
	list_add_tail(&sp->so_lru, &server->state_owners_lru);
	spin_unlock(&clp->cl_lock);
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}

/**
 * nfs4_purge_state_owners - Release all cached state owners
 * @server: nfs_server with cached state owners to release
 *
 * Called at umount time.  Remaining state owners will be on
 * the LRU with ref count of zero.
 */
void nfs4_purge_state_owners(struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;
	struct nfs4_state_owner *sp, *tmp;
	LIST_HEAD(doomed);

	spin_lock(&clp->cl_lock);
	list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
		list_move(&sp->so_lru, &doomed);
		nfs4_remove_state_owner_locked(sp);
	}
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	spin_unlock(&clp->cl_lock);
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	list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
		list_del(&sp->so_lru);
		nfs4_free_state_owner(sp);
	}
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}

static struct nfs4_state *
nfs4_alloc_open_state(void)
{
	struct nfs4_state *state;

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	state = kzalloc(sizeof(*state), GFP_NOFS);
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	if (!state)
		return NULL;
	atomic_set(&state->count, 1);
	INIT_LIST_HEAD(&state->lock_states);
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	spin_lock_init(&state->state_lock);
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	seqlock_init(&state->seqlock);
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	return state;
}

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void
590
nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
591
{
592
	if (state->state == fmode)
593 594
		return;
	/* NB! List reordering - see the reclaim code for why.  */
595 596
	if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
		if (fmode & FMODE_WRITE)
597 598 599 600
			list_move(&state->open_states, &state->owner->so_states);
		else
			list_move_tail(&state->open_states, &state->owner->so_states);
	}
601
	state->state = fmode;
602 603
}

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static struct nfs4_state *
__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs4_state *state;

	list_for_each_entry(state, &nfsi->open_states, inode_states) {
611
		if (state->owner != owner)
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Linus Torvalds 已提交
612
			continue;
613
		if (atomic_inc_not_zero(&state->count))
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			return state;
	}
	return NULL;
}

static void
nfs4_free_open_state(struct nfs4_state *state)
{
	kfree(state);
}

struct nfs4_state *
nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
{
	struct nfs4_state *state, *new;
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	state = __nfs4_find_state_byowner(inode, owner);
	spin_unlock(&inode->i_lock);
	if (state)
		goto out;
	new = nfs4_alloc_open_state();
637
	spin_lock(&owner->so_lock);
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638 639 640 641 642 643 644
	spin_lock(&inode->i_lock);
	state = __nfs4_find_state_byowner(inode, owner);
	if (state == NULL && new != NULL) {
		state = new;
		state->owner = owner;
		atomic_inc(&owner->so_count);
		list_add(&state->inode_states, &nfsi->open_states);
645 646
		ihold(inode);
		state->inode = inode;
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647
		spin_unlock(&inode->i_lock);
648 649 650 651
		/* Note: The reclaim code dictates that we add stateless
		 * and read-only stateids to the end of the list */
		list_add_tail(&state->open_states, &owner->so_states);
		spin_unlock(&owner->so_lock);
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	} else {
		spin_unlock(&inode->i_lock);
654
		spin_unlock(&owner->so_lock);
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655 656 657 658 659 660 661 662 663 664 665 666
		if (new)
			nfs4_free_open_state(new);
	}
out:
	return state;
}

void nfs4_put_open_state(struct nfs4_state *state)
{
	struct inode *inode = state->inode;
	struct nfs4_state_owner *owner = state->owner;

667
	if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
L
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668
		return;
669
	spin_lock(&inode->i_lock);
670
	list_del(&state->inode_states);
L
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671
	list_del(&state->open_states);
672 673
	spin_unlock(&inode->i_lock);
	spin_unlock(&owner->so_lock);
L
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674 675 676 677 678 679
	iput(inode);
	nfs4_free_open_state(state);
	nfs4_put_state_owner(owner);
}

/*
680
 * Close the current file.
L
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681
 */
682
static void __nfs4_close(struct nfs4_state *state,
683
		fmode_t fmode, gfp_t gfp_mask, int wait)
L
Linus Torvalds 已提交
684 685
{
	struct nfs4_state_owner *owner = state->owner;
686
	int call_close = 0;
687
	fmode_t newstate;
L
Linus Torvalds 已提交
688 689 690

	atomic_inc(&owner->so_count);
	/* Protect against nfs4_find_state() */
691
	spin_lock(&owner->so_lock);
692
	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
693 694 695 696 697 698 699 700 701
		case FMODE_READ:
			state->n_rdonly--;
			break;
		case FMODE_WRITE:
			state->n_wronly--;
			break;
		case FMODE_READ|FMODE_WRITE:
			state->n_rdwr--;
	}
702
	newstate = FMODE_READ|FMODE_WRITE;
703
	if (state->n_rdwr == 0) {
704
		if (state->n_rdonly == 0) {
705
			newstate &= ~FMODE_READ;
706 707 708 709
			call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
		}
		if (state->n_wronly == 0) {
710
			newstate &= ~FMODE_WRITE;
711 712 713 714 715
			call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
		}
		if (newstate == 0)
			clear_bit(NFS_DELEGATED_STATE, &state->flags);
716
	}
717
	nfs4_state_set_mode_locked(state, newstate);
718
	spin_unlock(&owner->so_lock);
719

720
	if (!call_close) {
721 722
		nfs4_put_open_state(state);
		nfs4_put_state_owner(owner);
F
Fred Isaman 已提交
723 724 725
	} else {
		bool roc = pnfs_roc(state->inode);

726
		nfs4_do_close(state, gfp_mask, wait, roc);
F
Fred Isaman 已提交
727
	}
728 729
}

730
void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
731
{
732
	__nfs4_close(state, fmode, GFP_NOFS, 0);
733 734
}

735
void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
736
{
737
	__nfs4_close(state, fmode, GFP_KERNEL, 1);
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738 739 740 741 742 743 744
}

/*
 * Search the state->lock_states for an existing lock_owner
 * that is compatible with current->files
 */
static struct nfs4_lock_state *
745
__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
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746 747 748
{
	struct nfs4_lock_state *pos;
	list_for_each_entry(pos, &state->lock_states, ls_locks) {
749
		if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
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750
			continue;
751 752 753 754 755 756 757 758 759
		switch (pos->ls_owner.lo_type) {
		case NFS4_POSIX_LOCK_TYPE:
			if (pos->ls_owner.lo_u.posix_owner != fl_owner)
				continue;
			break;
		case NFS4_FLOCK_LOCK_TYPE:
			if (pos->ls_owner.lo_u.flock_owner != fl_pid)
				continue;
		}
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		atomic_inc(&pos->ls_count);
		return pos;
	}
	return NULL;
}

/*
 * Return a compatible lock_state. If no initialized lock_state structure
 * exists, return an uninitialized one.
 *
 */
771
static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
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772 773
{
	struct nfs4_lock_state *lsp;
774
	struct nfs_server *server = state->owner->so_server;
L
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775

776
	lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
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777 778
	if (lsp == NULL)
		return NULL;
779
	nfs4_init_seqid_counter(&lsp->ls_seqid);
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780
	atomic_set(&lsp->ls_count, 1);
781
	lsp->ls_state = state;
782 783 784 785 786 787 788 789 790
	lsp->ls_owner.lo_type = type;
	switch (lsp->ls_owner.lo_type) {
	case NFS4_FLOCK_LOCK_TYPE:
		lsp->ls_owner.lo_u.flock_owner = fl_pid;
		break;
	case NFS4_POSIX_LOCK_TYPE:
		lsp->ls_owner.lo_u.posix_owner = fl_owner;
		break;
	default:
791
		goto out_free;
792
	}
793 794
	lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
	if (lsp->ls_seqid.owner_id < 0)
795
		goto out_free;
796
	INIT_LIST_HEAD(&lsp->ls_locks);
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797
	return lsp;
798 799 800
out_free:
	kfree(lsp);
	return NULL;
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801 802
}

803
void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
804
{
805
	ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
806
	nfs4_destroy_seqid_counter(&lsp->ls_seqid);
807 808 809
	kfree(lsp);
}

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/*
 * Return a compatible lock_state. If no initialized lock_state structure
 * exists, return an uninitialized one.
 *
 */
815
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
L
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816
{
817
	struct nfs4_lock_state *lsp, *new = NULL;
L
Linus Torvalds 已提交
818
	
819 820
	for(;;) {
		spin_lock(&state->state_lock);
821
		lsp = __nfs4_find_lock_state(state, owner, pid, type);
822 823 824 825 826 827 828 829 830 831
		if (lsp != NULL)
			break;
		if (new != NULL) {
			list_add(&new->ls_locks, &state->lock_states);
			set_bit(LK_STATE_IN_USE, &state->flags);
			lsp = new;
			new = NULL;
			break;
		}
		spin_unlock(&state->state_lock);
832
		new = nfs4_alloc_lock_state(state, owner, pid, type);
833 834 835 836
		if (new == NULL)
			return NULL;
	}
	spin_unlock(&state->state_lock);
837
	if (new != NULL)
838
		nfs4_free_lock_state(state->owner->so_server, new);
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	return lsp;
}

/*
843 844
 * Release reference to lock_state, and free it if we see that
 * it is no longer in use
L
Linus Torvalds 已提交
845
 */
846
void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
L
Linus Torvalds 已提交
847
{
848
	struct nfs4_state *state;
L
Linus Torvalds 已提交
849

850 851 852 853 854 855 856 857 858
	if (lsp == NULL)
		return;
	state = lsp->ls_state;
	if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
		return;
	list_del(&lsp->ls_locks);
	if (list_empty(&state->lock_states))
		clear_bit(LK_STATE_IN_USE, &state->flags);
	spin_unlock(&state->state_lock);
859 860 861 862
	if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
		if (nfs4_release_lockowner(lsp) == 0)
			return;
	}
863
	nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
L
Linus Torvalds 已提交
864 865
}

866
static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
L
Linus Torvalds 已提交
867
{
868
	struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
L
Linus Torvalds 已提交
869

870 871 872
	dst->fl_u.nfs4_fl.owner = lsp;
	atomic_inc(&lsp->ls_count);
}
L
Linus Torvalds 已提交
873

874
static void nfs4_fl_release_lock(struct file_lock *fl)
L
Linus Torvalds 已提交
875
{
876
	nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
L
Linus Torvalds 已提交
877 878
}

879
static const struct file_lock_operations nfs4_fl_lock_ops = {
880 881 882 883 884
	.fl_copy_lock = nfs4_fl_copy_lock,
	.fl_release_private = nfs4_fl_release_lock,
};

int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
L
Linus Torvalds 已提交
885
{
886 887 888 889
	struct nfs4_lock_state *lsp;

	if (fl->fl_ops != NULL)
		return 0;
890 891 892
	if (fl->fl_flags & FL_POSIX)
		lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
	else if (fl->fl_flags & FL_FLOCK)
893 894
		lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
				NFS4_FLOCK_LOCK_TYPE);
895 896
	else
		return -EINVAL;
897 898 899 900 901
	if (lsp == NULL)
		return -ENOMEM;
	fl->fl_u.nfs4_fl.owner = lsp;
	fl->fl_ops = &nfs4_fl_lock_ops;
	return 0;
L
Linus Torvalds 已提交
902 903
}

904 905
static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
		fl_owner_t fl_owner, pid_t fl_pid)
L
Linus Torvalds 已提交
906
{
907
	struct nfs4_lock_state *lsp;
908
	bool ret = false;
L
Linus Torvalds 已提交
909

910
	if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
911
		goto out;
L
Linus Torvalds 已提交
912

913
	spin_lock(&state->state_lock);
914
	lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
915
	if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
916
		nfs4_stateid_copy(dst, &lsp->ls_stateid);
917 918
		ret = true;
	}
919
	spin_unlock(&state->state_lock);
L
Linus Torvalds 已提交
920
	nfs4_put_lock_state(lsp);
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
out:
	return ret;
}

static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
	int seq;

	do {
		seq = read_seqbegin(&state->seqlock);
		nfs4_stateid_copy(dst, &state->stateid);
	} while (read_seqretry(&state->seqlock, seq));
}

/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
 */
void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
		fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
{
	if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
		return;
	if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
		return;
	nfs4_copy_open_stateid(dst, state);
L
Linus Torvalds 已提交
947 948
}

949
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
950 951 952
{
	struct nfs_seqid *new;

953
	new = kmalloc(sizeof(*new), gfp_mask);
954 955
	if (new != NULL) {
		new->sequence = counter;
956
		INIT_LIST_HEAD(&new->list);
957
		new->task = NULL;
958 959 960 961
	}
	return new;
}

962
void nfs_release_seqid(struct nfs_seqid *seqid)
L
Linus Torvalds 已提交
963
{
964
	struct nfs_seqid_counter *sequence;
965

966 967 968 969 970 971 972 973 974 975 976
	if (list_empty(&seqid->list))
		return;
	sequence = seqid->sequence;
	spin_lock(&sequence->lock);
	list_del_init(&seqid->list);
	if (!list_empty(&sequence->list)) {
		struct nfs_seqid *next;

		next = list_first_entry(&sequence->list,
				struct nfs_seqid, list);
		rpc_wake_up_queued_task(&sequence->wait, next->task);
977
	}
978
	spin_unlock(&sequence->lock);
979 980 981 982 983
}

void nfs_free_seqid(struct nfs_seqid *seqid)
{
	nfs_release_seqid(seqid);
984
	kfree(seqid);
L
Linus Torvalds 已提交
985 986 987
}

/*
988 989 990 991
 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 * failed with a seqid incrementing error -
 * see comments nfs_fs.h:seqid_mutating_error()
 */
992
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
993
{
994
	BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
995 996 997 998
	switch (status) {
		case 0:
			break;
		case -NFS4ERR_BAD_SEQID:
999 1000
			if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
				return;
1001
			pr_warn_ratelimited("NFS: v4 server returned a bad"
D
Dan Muntz 已提交
1002 1003
					" sequence-id error on an"
					" unconfirmed sequence %p!\n",
1004
					seqid->sequence);
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
		case -NFS4ERR_STALE_CLIENTID:
		case -NFS4ERR_STALE_STATEID:
		case -NFS4ERR_BAD_STATEID:
		case -NFS4ERR_BADXDR:
		case -NFS4ERR_RESOURCE:
		case -NFS4ERR_NOFILEHANDLE:
			/* Non-seqid mutating errors */
			return;
	};
	/*
	 * Note: no locking needed as we are guaranteed to be first
	 * on the sequence list
	 */
	seqid->sequence->counter++;
}

void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
{
1023 1024 1025 1026 1027
	struct nfs4_state_owner *sp = container_of(seqid->sequence,
					struct nfs4_state_owner, so_seqid);
	struct nfs_server *server = sp->so_server;

	if (status == -NFS4ERR_BAD_SEQID)
L
Linus Torvalds 已提交
1028
		nfs4_drop_state_owner(sp);
1029 1030
	if (!nfs4_has_session(server->nfs_client))
		nfs_increment_seqid(status, seqid);
1031 1032 1033 1034 1035 1036 1037 1038 1039
}

/*
 * Increment the seqid if the LOCK/LOCKU succeeded, or
 * failed with a seqid incrementing error -
 * see comments nfs_fs.h:seqid_mutating_error()
 */
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
{
1040
	nfs_increment_seqid(status, seqid);
1041 1042 1043 1044
}

int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
{
1045
	struct nfs_seqid_counter *sequence = seqid->sequence;
1046 1047 1048
	int status = 0;

	spin_lock(&sequence->lock);
1049
	seqid->task = task;
1050 1051 1052 1053
	if (list_empty(&seqid->list))
		list_add_tail(&seqid->list, &sequence->list);
	if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
		goto unlock;
1054
	rpc_sleep_on(&sequence->wait, task, NULL);
1055 1056
	status = -EAGAIN;
unlock:
1057 1058
	spin_unlock(&sequence->lock);
	return status;
L
Linus Torvalds 已提交
1059 1060
}

1061
static int nfs4_run_state_manager(void *);
L
Linus Torvalds 已提交
1062

1063
static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
T
Trond Myklebust 已提交
1064 1065
{
	smp_mb__before_clear_bit();
1066
	clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
T
Trond Myklebust 已提交
1067
	smp_mb__after_clear_bit();
1068
	wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
T
Trond Myklebust 已提交
1069 1070 1071
	rpc_wake_up(&clp->cl_rpcwaitq);
}

L
Linus Torvalds 已提交
1072
/*
1073
 * Schedule the nfs_client asynchronous state management routine
L
Linus Torvalds 已提交
1074
 */
1075
void nfs4_schedule_state_manager(struct nfs_client *clp)
L
Linus Torvalds 已提交
1076
{
1077
	struct task_struct *task;
1078
	char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
L
Linus Torvalds 已提交
1079

1080 1081
	if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
		return;
1082 1083
	__module_get(THIS_MODULE);
	atomic_inc(&clp->cl_count);
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099

	/* The rcu_read_lock() is not strictly necessary, as the state
	 * manager is the only thread that ever changes the rpc_xprt
	 * after it's initialized.  At this point, we're single threaded. */
	rcu_read_lock();
	snprintf(buf, sizeof(buf), "%s-manager",
			rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	rcu_read_unlock();
	task = kthread_run(nfs4_run_state_manager, clp, buf);
	if (IS_ERR(task)) {
		printk(KERN_ERR "%s: kthread_run: %ld\n",
			__func__, PTR_ERR(task));
		nfs4_clear_state_manager_bit(clp);
		nfs_put_client(clp);
		module_put(THIS_MODULE);
	}
L
Linus Torvalds 已提交
1100 1101 1102
}

/*
1103
 * Schedule a lease recovery attempt
L
Linus Torvalds 已提交
1104
 */
1105
void nfs4_schedule_lease_recovery(struct nfs_client *clp)
L
Linus Torvalds 已提交
1106 1107 1108
{
	if (!clp)
		return;
1109 1110
	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1111
	nfs4_schedule_state_manager(clp);
L
Linus Torvalds 已提交
1112
}
A
Andy Adamson 已提交
1113
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
L
Linus Torvalds 已提交
1114

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
/*
 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
 * @clp: client to process
 *
 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
 * resend of the SETCLIENTID and hence re-establish the
 * callback channel. Then return all existing delegations.
 */
static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
{
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
	nfs_expire_all_delegations(clp);
}

1129 1130
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
{
1131
	nfs40_handle_cb_pathdown(clp);
1132 1133 1134
	nfs4_schedule_state_manager(clp);
}

1135
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1136 1137 1138 1139 1140 1141 1142 1143
{

	set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
	/* Don't recover state that expired before the reboot */
	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
		clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
		return 0;
	}
1144
	set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1145 1146 1147 1148
	set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
	return 1;
}

1149
static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1150 1151 1152
{
	set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
	clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1153
	set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1154 1155 1156 1157
	set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
	return 1;
}

1158 1159 1160 1161 1162 1163 1164
void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
{
	struct nfs_client *clp = server->nfs_client;

	nfs4_state_mark_reclaim_nograce(clp, state);
	nfs4_schedule_state_manager(clp);
}
A
Andy Adamson 已提交
1165
EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1166

1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
void nfs_inode_find_state_and_recover(struct inode *inode,
		const nfs4_stateid *stateid)
{
	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
	bool found = false;

	spin_lock(&inode->i_lock);
	list_for_each_entry(ctx, &nfsi->open_files, list) {
		state = ctx->state;
		if (state == NULL)
			continue;
		if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
			continue;
1183
		if (!nfs4_stateid_match(&state->stateid, stateid))
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
			continue;
		nfs4_state_mark_reclaim_nograce(clp, state);
		found = true;
	}
	spin_unlock(&inode->i_lock);
	if (found)
		nfs4_schedule_state_manager(clp);
}


1194
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1195 1196
{
	struct inode *inode = state->inode;
1197
	struct nfs_inode *nfsi = NFS_I(inode);
L
Linus Torvalds 已提交
1198 1199 1200
	struct file_lock *fl;
	int status = 0;

1201 1202 1203 1204
	if (inode->i_flock == NULL)
		return 0;

	/* Guard against delegation returns and new lock/unlock calls */
1205
	down_write(&nfsi->rwsem);
1206
	/* Protect inode->i_flock using the BKL */
1207
	lock_flocks();
H
Harvey Harrison 已提交
1208
	for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1209
		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
L
Linus Torvalds 已提交
1210
			continue;
1211
		if (nfs_file_open_context(fl->fl_file)->state != state)
L
Linus Torvalds 已提交
1212
			continue;
1213
		unlock_flocks();
L
Linus Torvalds 已提交
1214 1215
		status = ops->recover_lock(state, fl);
		switch (status) {
1216 1217 1218 1219 1220 1221 1222 1223 1224
			case 0:
				break;
			case -ESTALE:
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_BAD_STATEID:
			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
			case -NFS4ERR_STALE_CLIENTID:
1225 1226 1227 1228
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1229
				goto out;
L
Linus Torvalds 已提交
1230
			default:
1231 1232
				printk(KERN_ERR "NFS: %s: unhandled error %d. "
					"Zeroing state\n", __func__, status);
1233 1234
			case -ENOMEM:
			case -NFS4ERR_DENIED:
L
Linus Torvalds 已提交
1235 1236
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1237
				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
1238
				status = 0;
L
Linus Torvalds 已提交
1239
		}
1240
		lock_flocks();
L
Linus Torvalds 已提交
1241
	}
1242
	unlock_flocks();
1243
out:
1244
	up_write(&nfsi->rwsem);
L
Linus Torvalds 已提交
1245 1246 1247
	return status;
}

1248
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
{
	struct nfs4_state *state;
	struct nfs4_lock_state *lock;
	int status = 0;

	/* Note: we rely on the sp->so_states list being ordered 
	 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
	 * states first.
	 * This is needed to ensure that the server won't give us any
	 * read delegations that we have to return if, say, we are
	 * recovering after a network partition or a reboot from a
	 * server that doesn't support a grace period.
	 */
1262 1263
restart:
	spin_lock(&sp->so_lock);
L
Linus Torvalds 已提交
1264
	list_for_each_entry(state, &sp->so_states, open_states) {
1265 1266
		if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
			continue;
L
Linus Torvalds 已提交
1267 1268
		if (state->state == 0)
			continue;
1269 1270
		atomic_inc(&state->count);
		spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1271 1272
		status = ops->recover_open(sp, state);
		if (status >= 0) {
1273 1274
			status = nfs4_reclaim_locks(state, ops);
			if (status >= 0) {
1275
				spin_lock(&state->state_lock);
1276 1277
				list_for_each_entry(lock, &state->lock_states, ls_locks) {
					if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1278 1279
						pr_warn_ratelimited("NFS: "
							"%s: Lock reclaim "
1280
							"failed!\n", __func__);
1281
				}
1282
				spin_unlock(&state->state_lock);
1283 1284
				nfs4_put_open_state(state);
				goto restart;
L
Linus Torvalds 已提交
1285 1286 1287 1288
			}
		}
		switch (status) {
			default:
1289 1290
				printk(KERN_ERR "NFS: %s: unhandled error %d. "
					"Zeroing state\n", __func__, status);
L
Linus Torvalds 已提交
1291
			case -ENOENT:
1292
			case -ENOMEM:
1293
			case -ESTALE:
L
Linus Torvalds 已提交
1294 1295 1296 1297
				/*
				 * Open state on this file cannot be recovered
				 * All we can do is revert to using the zero stateid.
				 */
1298 1299
				memset(&state->stateid, 0,
					sizeof(state->stateid));
L
Linus Torvalds 已提交
1300 1301 1302
				/* Mark the file as being 'closed' */
				state->state = 0;
				break;
1303 1304 1305 1306 1307 1308 1309 1310
			case -EKEYEXPIRED:
				/*
				 * User RPCSEC_GSS context has expired.
				 * We cannot recover this stateid now, so
				 * skip it and allow recovery thread to
				 * proceed.
				 */
				break;
1311 1312 1313
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_BAD_STATEID:
1314 1315
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1316
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1317
				break;
L
Linus Torvalds 已提交
1318 1319
			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
1320
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
L
Linus Torvalds 已提交
1321
			case -NFS4ERR_STALE_CLIENTID:
1322 1323 1324 1325
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
L
Linus Torvalds 已提交
1326 1327
				goto out_err;
		}
1328 1329
		nfs4_put_open_state(state);
		goto restart;
L
Linus Torvalds 已提交
1330
	}
1331
	spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1332 1333
	return 0;
out_err:
1334
	nfs4_put_open_state(state);
L
Linus Torvalds 已提交
1335 1336 1337
	return status;
}

1338 1339 1340 1341 1342 1343 1344 1345
static void nfs4_clear_open_state(struct nfs4_state *state)
{
	struct nfs4_lock_state *lock;

	clear_bit(NFS_DELEGATED_STATE, &state->flags);
	clear_bit(NFS_O_RDONLY_STATE, &state->flags);
	clear_bit(NFS_O_WRONLY_STATE, &state->flags);
	clear_bit(NFS_O_RDWR_STATE, &state->flags);
1346
	spin_lock(&state->state_lock);
1347 1348 1349 1350
	list_for_each_entry(lock, &state->lock_states, ls_locks) {
		lock->ls_seqid.flags = 0;
		lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
	}
1351
	spin_unlock(&state->state_lock);
1352 1353
}

1354 1355
static void nfs4_reset_seqids(struct nfs_server *server,
	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1356
{
1357
	struct nfs_client *clp = server->nfs_client;
1358
	struct nfs4_state_owner *sp;
1359
	struct rb_node *pos;
1360 1361
	struct nfs4_state *state;

1362 1363 1364 1365 1366
	spin_lock(&clp->cl_lock);
	for (pos = rb_first(&server->state_owners);
	     pos != NULL;
	     pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1367
		sp->so_seqid.flags = 0;
1368
		spin_lock(&sp->so_lock);
1369
		list_for_each_entry(state, &sp->so_states, open_states) {
1370 1371
			if (mark_reclaim(clp, state))
				nfs4_clear_open_state(state);
1372
		}
1373
		spin_unlock(&sp->so_lock);
1374
	}
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
	spin_unlock(&clp->cl_lock);
}

static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
{
	struct nfs_server *server;

	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
		nfs4_reset_seqids(server, mark_reclaim);
	rcu_read_unlock();
1387 1388
}

1389 1390 1391 1392 1393 1394 1395
static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
{
	/* Mark all delegations for reclaim */
	nfs_delegation_mark_reclaim(clp);
	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
}

1396 1397 1398 1399 1400 1401 1402 1403
static void nfs4_reclaim_complete(struct nfs_client *clp,
				 const struct nfs4_state_recovery_ops *ops)
{
	/* Notify the server we're done reclaiming our state */
	if (ops->reclaim_complete)
		(void)ops->reclaim_complete(clp);
}

1404
static void nfs4_clear_reclaim_server(struct nfs_server *server)
1405
{
1406
	struct nfs_client *clp = server->nfs_client;
1407 1408 1409 1410
	struct nfs4_state_owner *sp;
	struct rb_node *pos;
	struct nfs4_state *state;

1411 1412 1413 1414 1415
	spin_lock(&clp->cl_lock);
	for (pos = rb_first(&server->state_owners);
	     pos != NULL;
	     pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1416 1417
		spin_lock(&sp->so_lock);
		list_for_each_entry(state, &sp->so_states, open_states) {
1418 1419
			if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
						&state->flags))
1420 1421 1422 1423 1424
				continue;
			nfs4_state_mark_reclaim_nograce(clp, state);
		}
		spin_unlock(&sp->so_lock);
	}
1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
	spin_unlock(&clp->cl_lock);
}

static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
{
	struct nfs_server *server;

	if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
		return 0;

	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
		nfs4_clear_reclaim_server(server);
	rcu_read_unlock();
1439 1440

	nfs_delegation_reap_unclaimed(clp);
1441 1442 1443 1444 1445 1446 1447 1448
	return 1;
}

static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
{
	if (!nfs4_state_clear_reclaim_reboot(clp))
		return;
	nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
}

static void nfs_delegation_clear_all(struct nfs_client *clp)
{
	nfs_delegation_mark_reclaim(clp);
	nfs_delegation_reap_unclaimed(clp);
}

static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
{
	nfs_delegation_clear_all(clp);
	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
}

1463 1464 1465 1466 1467 1468 1469 1470
static void nfs4_warn_keyexpired(const char *s)
{
	printk_ratelimited(KERN_WARNING "Error: state manager"
			" encountered RPCSEC_GSS session"
			" expired against NFSv4 server %s.\n",
			s);
}

1471
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1472 1473
{
	switch (error) {
1474 1475
		case 0:
			break;
1476
		case -NFS4ERR_CB_PATH_DOWN:
1477
			nfs40_handle_cb_pathdown(clp);
1478
			break;
1479 1480
		case -NFS4ERR_NO_GRACE:
			nfs4_state_end_reclaim_reboot(clp);
1481
			break;
1482 1483 1484
		case -NFS4ERR_STALE_CLIENTID:
		case -NFS4ERR_LEASE_MOVED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1485
			nfs4_state_clear_reclaim_reboot(clp);
1486 1487 1488 1489 1490
			nfs4_state_start_reclaim_reboot(clp);
			break;
		case -NFS4ERR_EXPIRED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
			nfs4_state_start_reclaim_nograce(clp);
1491
			break;
1492 1493 1494 1495 1496 1497 1498
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
1499
			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1500
			/* Zero session reset errors */
1501
			break;
1502 1503 1504
		case -EKEYEXPIRED:
			/* Nothing we can do */
			nfs4_warn_keyexpired(clp->cl_hostname);
1505 1506 1507
			break;
		default:
			return error;
1508
	}
1509
	return 0;
1510 1511
}

1512
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1513
{
1514 1515
	struct nfs4_state_owner *sp;
	struct nfs_server *server;
1516
	struct rb_node *pos;
L
Linus Torvalds 已提交
1517 1518
	int status = 0;

1519
restart:
1520 1521
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1522
		nfs4_purge_state_owners(server);
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
		spin_lock(&clp->cl_lock);
		for (pos = rb_first(&server->state_owners);
		     pos != NULL;
		     pos = rb_next(pos)) {
			sp = rb_entry(pos,
				struct nfs4_state_owner, so_server_node);
			if (!test_and_clear_bit(ops->owner_flag_bit,
							&sp->so_flags))
				continue;
			atomic_inc(&sp->so_count);
			spin_unlock(&clp->cl_lock);
			rcu_read_unlock();

			status = nfs4_reclaim_open_state(sp, ops);
			if (status < 0) {
				set_bit(ops->owner_flag_bit, &sp->so_flags);
				nfs4_put_state_owner(sp);
				return nfs4_recovery_handle_error(clp, status);
			}

1543
			nfs4_put_state_owner(sp);
1544
			goto restart;
1545
		}
1546
		spin_unlock(&clp->cl_lock);
1547
	}
1548
	rcu_read_unlock();
1549 1550 1551 1552 1553 1554
	return status;
}

static int nfs4_check_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
1555 1556
	const struct nfs4_state_maintenance_ops *ops =
		clp->cl_mvops->state_renewal_ops;
1557
	int status;
L
Linus Torvalds 已提交
1558

1559 1560 1561
	/* Is the client already known to have an expired lease? */
	if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		return 0;
1562 1563 1564
	spin_lock(&clp->cl_lock);
	cred = ops->get_state_renewal_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
1565 1566
	if (cred == NULL) {
		cred = nfs4_get_setclientid_cred(clp);
1567
		status = -ENOKEY;
1568 1569
		if (cred == NULL)
			goto out;
1570
	}
1571
	status = ops->renew_lease(clp, cred);
1572 1573
	put_rpccred(cred);
out:
1574
	return nfs4_recovery_handle_error(clp, status);
1575 1576 1577 1578 1579
}

static int nfs4_reclaim_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
1580 1581
	const struct nfs4_state_recovery_ops *ops =
		clp->cl_mvops->reboot_recovery_ops;
1582 1583
	int status = -ENOENT;

1584
	cred = ops->get_clid_cred(clp);
1585
	if (cred != NULL) {
1586
		status = ops->establish_clid(clp, cred);
1587
		put_rpccred(cred);
1588 1589 1590
		/* Handle case where the user hasn't set up machine creds */
		if (status == -EACCES && cred == clp->cl_machine_cred) {
			nfs4_clear_machine_cred(clp);
1591
			status = -EAGAIN;
1592
		}
1593 1594
		if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
			status = -EPROTONOSUPPORT;
1595
	}
1596 1597 1598
	return status;
}

1599
#ifdef CONFIG_NFS_V4_1
1600 1601
void nfs4_schedule_session_recovery(struct nfs4_session *session)
{
1602 1603 1604 1605
	struct nfs_client *clp = session->clp;

	set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
	nfs4_schedule_lease_recovery(clp);
1606
}
1607
EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1608

A
Andy Adamson 已提交
1609 1610 1611
void nfs41_handle_recall_slot(struct nfs_client *clp)
{
	set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1612
	nfs4_schedule_state_manager(clp);
A
Andy Adamson 已提交
1613 1614
}

1615 1616 1617 1618 1619
static void nfs4_reset_all_state(struct nfs_client *clp)
{
	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
		clp->cl_boot_time = CURRENT_TIME;
		nfs4_state_start_reclaim_nograce(clp);
1620
		nfs4_schedule_state_manager(clp);
1621 1622 1623 1624 1625 1626 1627
	}
}

static void nfs41_handle_server_reboot(struct nfs_client *clp)
{
	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
		nfs4_state_start_reclaim_reboot(clp);
1628
		nfs4_schedule_state_manager(clp);
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
	}
}

static void nfs41_handle_state_revoked(struct nfs_client *clp)
{
	/* Temporary */
	nfs4_reset_all_state(clp);
}

static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
{
	/* This will need to handle layouts too */
	nfs_expire_all_delegations(clp);
}

static void nfs41_handle_cb_path_down(struct nfs_client *clp)
{
	nfs_expire_all_delegations(clp);
	if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1648
		nfs4_schedule_state_manager(clp);
1649 1650
}

1651 1652 1653 1654
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
{
	if (!flags)
		return;
1655
	if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1656
		nfs41_handle_server_reboot(clp);
1657
	if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1658 1659
			    SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
			    SEQ4_STATUS_ADMIN_STATE_REVOKED |
1660 1661
			    SEQ4_STATUS_LEASE_MOVED))
		nfs41_handle_state_revoked(clp);
1662
	if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1663
		nfs41_handle_recallable_state_revoked(clp);
1664
	if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1665 1666
			    SEQ4_STATUS_BACKCHANNEL_FAULT |
			    SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1667
		nfs41_handle_cb_path_down(clp);
1668 1669
}

1670 1671 1672 1673
static int nfs4_reset_session(struct nfs_client *clp)
{
	int status;

1674
	nfs4_begin_drain_session(clp);
1675 1676 1677
	status = nfs4_proc_destroy_session(clp->cl_session);
	if (status && status != -NFS4ERR_BADSESSION &&
	    status != -NFS4ERR_DEADSESSION) {
1678
		status = nfs4_recovery_handle_error(clp, status);
1679 1680 1681 1682
		goto out;
	}

	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1683
	status = nfs4_proc_create_session(clp);
1684
	if (status) {
1685
		status = nfs4_recovery_handle_error(clp, status);
1686 1687
		goto out;
	}
1688
	clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1689 1690
	/* create_session negotiated new slot table */
	clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1691

1692 1693
	 /* Let the state manager reestablish state */
	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1694
		nfs41_setup_state_renewal(clp);
1695
out:
1696 1697
	return status;
}
1698

A
Andy Adamson 已提交
1699 1700 1701 1702 1703 1704 1705 1706 1707
static int nfs4_recall_slot(struct nfs_client *clp)
{
	struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
	struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
	struct nfs4_slot *new, *old;
	int i;

	nfs4_begin_drain_session(clp);
	new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1708
		      GFP_NOFS);
A
Andy Adamson 已提交
1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
        if (!new)
		return -ENOMEM;

	spin_lock(&fc_tbl->slot_tbl_lock);
	for (i = 0; i < fc_tbl->target_max_slots; i++)
		new[i].seq_nr = fc_tbl->slots[i].seq_nr;
	old = fc_tbl->slots;
	fc_tbl->slots = new;
	fc_tbl->max_slots = fc_tbl->target_max_slots;
	fc_tbl->target_max_slots = 0;
	fc_attrs->max_reqs = fc_tbl->max_slots;
	spin_unlock(&fc_tbl->slot_tbl_lock);

	kfree(old);
	nfs4_end_drain_session(clp);
	return 0;
}

1727
#else /* CONFIG_NFS_V4_1 */
1728
static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1729
static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
A
Andy Adamson 已提交
1730
static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1731 1732
#endif /* CONFIG_NFS_V4_1 */

1733 1734 1735 1736 1737
/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
 * on EXCHANGE_ID for v4.1
 */
static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
{
1738 1739 1740 1741 1742 1743
	switch (status) {
	case -NFS4ERR_CLID_INUSE:
	case -NFS4ERR_STALE_CLIENTID:
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
		break;
	case -NFS4ERR_DELAY:
1744
	case -ETIMEDOUT:
1745 1746 1747
	case -EAGAIN:
		ssleep(1);
		break;
1748

1749 1750 1751 1752 1753 1754
	case -EKEYEXPIRED:
		nfs4_warn_keyexpired(clp->cl_hostname);
	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
				 * in nfs4_exchange_id */
	default:
		return;
1755 1756 1757 1758
	}
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
}

1759
static void nfs4_state_manager(struct nfs_client *clp)
1760 1761 1762 1763
{
	int status = 0;

	/* Ensure exclusive access to NFSv4 state */
1764
	do {
1765 1766 1767 1768
		if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
			/* We're going to have to re-establish a clientid */
			status = nfs4_reclaim_lease(clp);
			if (status) {
1769
				nfs4_set_lease_expired(clp, status);
1770 1771
				if (test_bit(NFS4CLNT_LEASE_EXPIRED,
							&clp->cl_state))
1772
					continue;
1773 1774 1775
				if (clp->cl_cons_state ==
							NFS_CS_SESSION_INITING)
					nfs_mark_client_ready(clp, status);
1776 1777
				goto out_error;
			}
1778
			clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1779 1780 1781 1782 1783 1784 1785 1786

			if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
					       &clp->cl_state))
				nfs4_state_start_reclaim_nograce(clp);
			else
				set_bit(NFS4CLNT_RECLAIM_REBOOT,
					&clp->cl_state);

1787
			pnfs_destroy_all_layouts(clp);
1788 1789 1790 1791
		}

		if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
			status = nfs4_check_lease(clp);
1792 1793
			if (status < 0)
				goto out_error;
1794
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1795
				continue;
1796
		}
1797

1798
		/* Initialize or reset the session */
1799
		if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1800
		   && nfs4_has_session(clp)) {
1801
			status = nfs4_reset_session(clp);
1802 1803 1804
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
				continue;
			if (status < 0)
1805 1806
				goto out_error;
		}
1807

1808
		/* First recover reboot state... */
1809
		if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1810
			status = nfs4_do_reclaim(clp,
1811
				clp->cl_mvops->reboot_recovery_ops);
1812
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1813
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1814
				continue;
1815
			nfs4_state_end_reclaim_reboot(clp);
1816 1817 1818 1819
			if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
				continue;
			if (status < 0)
				goto out_error;
1820 1821
		}

1822 1823
		/* Now recover expired state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1824
			status = nfs4_do_reclaim(clp,
1825
				clp->cl_mvops->nograce_recovery_ops);
1826
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1827
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1828 1829 1830
			    test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
				continue;
			if (status < 0)
1831
				goto out_error;
L
Linus Torvalds 已提交
1832
		}
1833

1834
		nfs4_end_drain_session(clp);
1835 1836 1837 1838
		if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
			nfs_client_return_marked_delegations(clp);
			continue;
		}
A
Andy Adamson 已提交
1839 1840 1841 1842 1843 1844 1845 1846 1847
		/* Recall session slots */
		if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
		   && nfs4_has_session(clp)) {
			status = nfs4_recall_slot(clp);
			if (status < 0)
				goto out_error;
			continue;
		}

1848 1849

		nfs4_clear_state_manager_bit(clp);
1850 1851 1852 1853 1854
		/* Did we race with an attempt to give us more work? */
		if (clp->cl_state == 0)
			break;
		if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
			break;
1855
	} while (atomic_read(&clp->cl_count) > 1);
1856
	return;
L
Linus Torvalds 已提交
1857
out_error:
1858
	pr_warn_ratelimited("NFS: state manager failed on NFSv4 server %s"
1859
			" with error %d\n", clp->cl_hostname, -status);
1860
	nfs4_end_drain_session(clp);
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872
	nfs4_clear_state_manager_bit(clp);
}

static int nfs4_run_state_manager(void *ptr)
{
	struct nfs_client *clp = ptr;

	allow_signal(SIGKILL);
	nfs4_state_manager(clp);
	nfs_put_client(clp);
	module_put_and_exit(0);
	return 0;
L
Linus Torvalds 已提交
1873 1874 1875 1876 1877 1878 1879
}

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */