nfs4state.c 64.0 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 <linux/sunrpc/clnt.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 "nfs4session.h"
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#include "pnfs.h"
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#include "netns.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 DEFINE_MUTEX(nfs_clid_init_mutex);
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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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	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
		goto do_confirm;
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	port = nn->nfs_callback_tcpport;
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	if (clp->cl_addr.ss_family == AF_INET6)
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		port = nn->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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/**
 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
 *
 * @clp: nfs_client under test
 * @result: OUT: found nfs_client, or clp
 * @cred: credential to use for trunking test
 *
 * Returns zero, a negative errno, or a negative NFS4ERR status.
 * If zero is returned, an nfs_client pointer is planted in
 * "result".
 *
 * Note: The returned client may not yet be marked ready.
 */
int nfs40_discover_server_trunking(struct nfs_client *clp,
				   struct nfs_client **result,
				   struct rpc_cred *cred)
{
	struct nfs4_setclientid_res clid = {
		.clientid = clp->cl_clientid,
		.confirm = clp->cl_confirm,
	};
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	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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	unsigned short port;
	int status;

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	port = nn->nfs_callback_tcpport;
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	if (clp->cl_addr.ss_family == AF_INET6)
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		port = nn->nfs_callback_tcpport6;
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	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
	if (status != 0)
		goto out;
	clp->cl_clientid = clid.clientid;
	clp->cl_confirm = clid.confirm;

	status = nfs40_walk_client_list(clp, result, cred);
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	if (status == 0) {
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		/* Sustain the lease, even if it's empty.  If the clientid4
		 * goes stale it's of no use for trunking discovery. */
		nfs4_schedule_state_renewal(*result);
	}
out:
	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;
}

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static void nfs4_root_machine_cred(struct nfs_client *clp)
{
	struct rpc_cred *cred, *new;

	new = rpc_lookup_machine_cred(NULL);
	spin_lock(&clp->cl_lock);
	cred = clp->cl_machine_cred;
	clp->cl_machine_cred = new;
	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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static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
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{
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	if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
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		spin_lock(&tbl->slot_tbl_lock);
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		nfs41_wake_slot_table(tbl);
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		spin_unlock(&tbl->slot_tbl_lock);
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	}
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}

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static void nfs4_end_drain_session(struct nfs_client *clp)
{
	struct nfs4_session *ses = clp->cl_session;

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	if (clp->cl_slot_tbl) {
		nfs4_end_drain_slot_table(clp->cl_slot_tbl);
		return;
	}

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	if (ses != NULL) {
		nfs4_end_drain_slot_table(&ses->bc_slot_table);
		nfs4_end_drain_slot_table(&ses->fc_slot_table);
	}
}

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static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
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{
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	set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
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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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		reinit_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;

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	if (clp->cl_slot_tbl)
		return nfs4_drain_slot_tbl(clp->cl_slot_tbl);

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	/* back channel */
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	ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
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	if (ret)
		return ret;
	/* fore channel */
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	return nfs4_drain_slot_tbl(&ses->fc_slot_table);
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}

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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;

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

	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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static void nfs41_finish_session_reset(struct nfs_client *clp)
{
	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
	clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
	/* create_session negotiated new slot table */
	clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
	nfs41_setup_state_renewal(clp);
}

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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, cred);
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	if (status != 0)
		goto out;
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	nfs41_finish_session_reset(clp);
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	nfs_mark_client_ready(clp, NFS_CS_READY);
out:
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	return status;
}

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/**
 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
 *
 * @clp: nfs_client under test
 * @result: OUT: found nfs_client, or clp
 * @cred: credential to use for trunking test
 *
 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
 * If NFS4_OK is returned, an nfs_client pointer is planted in
 * "result".
 *
 * Note: The returned client may not yet be marked ready.
 */
int nfs41_discover_server_trunking(struct nfs_client *clp,
				   struct nfs_client **result,
				   struct rpc_cred *cred)
{
	int status;

	status = nfs4_proc_exchange_id(clp, cred);
	if (status != NFS4_OK)
		return status;
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	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
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	return nfs41_walk_client_list(clp, result, cred);
}

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#endif /* CONFIG_NFS_V4_1 */

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/**
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 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
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 * @clp: client state handle
 *
 * Returns an rpc_cred with reference count bumped, or NULL.
 */
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struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
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{
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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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	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)
431
{
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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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	seqcount_init(&sp->so_reclaim_seqcount);
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	mutex_init(&sp->so_delegreturn_mutex);
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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)
{
583 584
	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;
588

589 590 591
	sp->so_expires = jiffies;
	list_add_tail(&sp->so_lru, &server->state_owners_lru);
	spin_unlock(&clp->cl_lock);
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
}

/**
 * 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);
613 614 615 616 617

	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;

625
	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);
630
	spin_lock_init(&state->state_lock);
631
	seqlock_init(&state->seqlock);
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	return state;
}

635
void
636
nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
637
{
638
	if (state->state == fmode)
639 640
		return;
	/* NB! List reordering - see the reclaim code for why.  */
641 642
	if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
		if (fmode & FMODE_WRITE)
643 644 645 646
			list_move(&state->open_states, &state->owner->so_states);
		else
			list_move_tail(&state->open_states, &state->owner->so_states);
	}
647
	state->state = fmode;
648 649
}

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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) {
657
		if (state->owner != owner)
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			continue;
659 660
		if (!nfs4_valid_open_stateid(state))
			continue;
661
		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();
685
	spin_lock(&owner->so_lock);
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	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);
693 694
		ihold(inode);
		state->inode = inode;
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		spin_unlock(&inode->i_lock);
696 697 698 699
		/* 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);
702
		spin_unlock(&owner->so_lock);
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		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;

715
	if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
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		return;
717
	spin_lock(&inode->i_lock);
718
	list_del(&state->inode_states);
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	list_del(&state->open_states);
720 721
	spin_unlock(&inode->i_lock);
	spin_unlock(&owner->so_lock);
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	iput(inode);
	nfs4_free_open_state(state);
	nfs4_put_state_owner(owner);
}

/*
728
 * Close the current file.
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 */
730
static void __nfs4_close(struct nfs4_state *state,
731
		fmode_t fmode, gfp_t gfp_mask, int wait)
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{
	struct nfs4_state_owner *owner = state->owner;
734
	int call_close = 0;
735
	fmode_t newstate;
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	atomic_inc(&owner->so_count);
	/* Protect against nfs4_find_state() */
739
	spin_lock(&owner->so_lock);
740
	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
741 742 743 744 745 746 747 748 749
		case FMODE_READ:
			state->n_rdonly--;
			break;
		case FMODE_WRITE:
			state->n_wronly--;
			break;
		case FMODE_READ|FMODE_WRITE:
			state->n_rdwr--;
	}
750
	newstate = FMODE_READ|FMODE_WRITE;
751
	if (state->n_rdwr == 0) {
752
		if (state->n_rdonly == 0) {
753
			newstate &= ~FMODE_READ;
754 755 756 757
			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) {
758
			newstate &= ~FMODE_WRITE;
759 760 761 762 763
			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);
764
	}
765
	nfs4_state_set_mode_locked(state, newstate);
766
	spin_unlock(&owner->so_lock);
767

768
	if (!call_close) {
769 770
		nfs4_put_open_state(state);
		nfs4_put_state_owner(owner);
771 772
	} else
		nfs4_do_close(state, gfp_mask, wait);
773 774
}

775
void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
776
{
777
	__nfs4_close(state, fmode, GFP_NOFS, 0);
778 779
}

780
void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
781
{
782
	__nfs4_close(state, fmode, GFP_KERNEL, 1);
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}

/*
 * Search the state->lock_states for an existing lock_owner
 * that is compatible with current->files
 */
static struct nfs4_lock_state *
790
__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
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{
	struct nfs4_lock_state *pos;
	list_for_each_entry(pos, &state->lock_states, ls_locks) {
794
		if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
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			continue;
796 797 798 799 800 801 802 803 804
		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.
 *
 */
816
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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{
	struct nfs4_lock_state *lsp;
819
	struct nfs_server *server = state->owner->so_server;
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820

821
	lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
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	if (lsp == NULL)
		return NULL;
824
	nfs4_init_seqid_counter(&lsp->ls_seqid);
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825
	atomic_set(&lsp->ls_count, 1);
826
	lsp->ls_state = state;
827 828 829 830 831 832 833 834 835
	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:
836
		goto out_free;
837
	}
838 839
	lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
	if (lsp->ls_seqid.owner_id < 0)
840
		goto out_free;
841
	INIT_LIST_HEAD(&lsp->ls_locks);
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842
	return lsp;
843 844 845
out_free:
	kfree(lsp);
	return NULL;
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}

848
void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
849
{
850
	ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
851
	nfs4_destroy_seqid_counter(&lsp->ls_seqid);
852 853 854
	kfree(lsp);
}

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/*
 * Return a compatible lock_state. If no initialized lock_state structure
 * exists, return an uninitialized one.
 *
 */
860
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
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861
{
862
	struct nfs4_lock_state *lsp, *new = NULL;
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863
	
864 865
	for(;;) {
		spin_lock(&state->state_lock);
866
		lsp = __nfs4_find_lock_state(state, owner, pid, type);
867 868 869 870 871 872 873 874 875 876
		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);
877
		new = nfs4_alloc_lock_state(state, owner, pid, type);
878 879 880 881
		if (new == NULL)
			return NULL;
	}
	spin_unlock(&state->state_lock);
882
	if (new != NULL)
883
		nfs4_free_lock_state(state->owner->so_server, new);
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884 885 886 887
	return lsp;
}

/*
888 889
 * Release reference to lock_state, and free it if we see that
 * it is no longer in use
L
Linus Torvalds 已提交
890
 */
891
void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
L
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892
{
893
	struct nfs_server *server;
894
	struct nfs4_state *state;
L
Linus Torvalds 已提交
895

896 897 898 899 900 901 902 903 904
	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);
905
	server = state->owner->so_server;
906
	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
907 908 909 910 911
		struct nfs_client *clp = server->nfs_client;

		clp->cl_mvops->free_lock_state(server, lsp);
	} else
		nfs4_free_lock_state(server, lsp);
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912 913
}

914
static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
L
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915
{
916
	struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
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917

918 919 920
	dst->fl_u.nfs4_fl.owner = lsp;
	atomic_inc(&lsp->ls_count);
}
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921

922
static void nfs4_fl_release_lock(struct file_lock *fl)
L
Linus Torvalds 已提交
923
{
924
	nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
L
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925 926
}

927
static const struct file_lock_operations nfs4_fl_lock_ops = {
928 929 930 931 932
	.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
933
{
934 935 936 937
	struct nfs4_lock_state *lsp;

	if (fl->fl_ops != NULL)
		return 0;
938 939 940
	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)
941 942
		lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
				NFS4_FLOCK_LOCK_TYPE);
943 944
	else
		return -EINVAL;
945 946 947 948 949
	if (lsp == NULL)
		return -ENOMEM;
	fl->fl_u.nfs4_fl.owner = lsp;
	fl->fl_ops = &nfs4_fl_lock_ops;
	return 0;
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}

952 953
static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
		struct nfs4_state *state,
954
		const struct nfs_lockowner *lockowner)
L
Linus Torvalds 已提交
955
{
956
	struct nfs4_lock_state *lsp;
957 958
	fl_owner_t fl_owner;
	pid_t fl_pid;
959
	int ret = -ENOENT;
L
Linus Torvalds 已提交
960

961 962 963 964

	if (lockowner == NULL)
		goto out;

965
	if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
966
		goto out;
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967

968 969
	fl_owner = lockowner->l_owner;
	fl_pid = lockowner->l_pid;
970
	spin_lock(&state->state_lock);
971
	lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
972 973 974
	if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
		ret = -EIO;
	else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
975
		nfs4_stateid_copy(dst, &lsp->ls_stateid);
976
		ret = 0;
977
	}
978
	spin_unlock(&state->state_lock);
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	nfs4_put_lock_state(lsp);
980 981 982 983
out:
	return ret;
}

984
static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
985
{
986
	const nfs4_stateid *src;
987 988 989
	int seq;

	do {
990
		src = &zero_stateid;
991
		seq = read_seqbegin(&state->seqlock);
992 993 994
		if (test_bit(NFS_OPEN_STATE, &state->flags))
			src = &state->open_stateid;
		nfs4_stateid_copy(dst, src);
995 996 997 998 999 1000 1001
	} while (read_seqretry(&state->seqlock, seq));
}

/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
 */
1002
int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1003
		fmode_t fmode, const struct nfs_lockowner *lockowner)
1004
{
1005 1006 1007 1008
	int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
	if (ret == -EIO)
		/* A lost lock - don't even consider delegations */
		goto out;
1009 1010 1011
	/* returns true if delegation stateid found and copied */
	if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
		ret = 0;
1012
		goto out;
1013
	}
1014
	if (ret != -ENOENT)
1015 1016 1017 1018
		/* nfs4_copy_delegation_stateid() didn't over-write
		 * dst, so it still has the lock stateid which we now
		 * choose to use.
		 */
1019
		goto out;
1020 1021
	nfs4_copy_open_stateid(dst, state);
	ret = 0;
1022
out:
1023 1024
	if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
		dst->seqid = 0;
1025
	return ret;
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1026 1027
}

1028
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1029 1030 1031
{
	struct nfs_seqid *new;

1032
	new = kmalloc(sizeof(*new), gfp_mask);
1033 1034
	if (new != NULL) {
		new->sequence = counter;
1035
		INIT_LIST_HEAD(&new->list);
1036
		new->task = NULL;
1037 1038 1039 1040
	}
	return new;
}

1041
void nfs_release_seqid(struct nfs_seqid *seqid)
L
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1042
{
1043
	struct nfs_seqid_counter *sequence;
1044

1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
	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);
1056
	}
1057
	spin_unlock(&sequence->lock);
1058 1059 1060 1061 1062
}

void nfs_free_seqid(struct nfs_seqid *seqid)
{
	nfs_release_seqid(seqid);
1063
	kfree(seqid);
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1064 1065 1066
}

/*
1067 1068
 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 * failed with a seqid incrementing error -
1069
 * see comments nfs4.h:seqid_mutating_error()
1070
 */
1071
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1072 1073 1074 1075 1076
{
	switch (status) {
		case 0:
			break;
		case -NFS4ERR_BAD_SEQID:
1077 1078
			if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
				return;
1079
			pr_warn_ratelimited("NFS: v4 server returned a bad"
D
Dan Muntz 已提交
1080 1081
					" sequence-id error on an"
					" unconfirmed sequence %p!\n",
1082
					seqid->sequence);
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
		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)
{
1101 1102 1103 1104 1105
	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)
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1106
		nfs4_drop_state_owner(sp);
1107 1108
	if (!nfs4_has_session(server->nfs_client))
		nfs_increment_seqid(status, seqid);
1109 1110 1111 1112 1113
}

/*
 * Increment the seqid if the LOCK/LOCKU succeeded, or
 * failed with a seqid incrementing error -
1114
 * see comments nfs4.h:seqid_mutating_error()
1115 1116 1117
 */
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
{
1118
	nfs_increment_seqid(status, seqid);
1119 1120 1121 1122
}

int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
{
1123
	struct nfs_seqid_counter *sequence = seqid->sequence;
1124 1125 1126
	int status = 0;

	spin_lock(&sequence->lock);
1127
	seqid->task = task;
1128 1129 1130 1131
	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;
1132
	rpc_sleep_on(&sequence->wait, task, NULL);
1133 1134
	status = -EAGAIN;
unlock:
1135 1136
	spin_unlock(&sequence->lock);
	return status;
L
Linus Torvalds 已提交
1137 1138
}

1139
static int nfs4_run_state_manager(void *);
L
Linus Torvalds 已提交
1140

1141
static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
T
Trond Myklebust 已提交
1142 1143
{
	smp_mb__before_clear_bit();
1144
	clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
T
Trond Myklebust 已提交
1145
	smp_mb__after_clear_bit();
1146
	wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
T
Trond Myklebust 已提交
1147 1148 1149
	rpc_wake_up(&clp->cl_rpcwaitq);
}

L
Linus Torvalds 已提交
1150
/*
1151
 * Schedule the nfs_client asynchronous state management routine
L
Linus Torvalds 已提交
1152
 */
1153
void nfs4_schedule_state_manager(struct nfs_client *clp)
L
Linus Torvalds 已提交
1154
{
1155
	struct task_struct *task;
1156
	char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
L
Linus Torvalds 已提交
1157

1158 1159
	if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
		return;
1160 1161
	__module_get(THIS_MODULE);
	atomic_inc(&clp->cl_count);
1162 1163 1164 1165 1166 1167 1168 1169

	/* 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();
1170
	task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1171 1172 1173 1174 1175 1176 1177
	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
1178 1179 1180
}

/*
1181
 * Schedule a lease recovery attempt
L
Linus Torvalds 已提交
1182
 */
1183
void nfs4_schedule_lease_recovery(struct nfs_client *clp)
L
Linus Torvalds 已提交
1184 1185 1186
{
	if (!clp)
		return;
1187 1188
	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1189 1190
	dprintk("%s: scheduling lease recovery for server %s\n", __func__,
			clp->cl_hostname);
1191
	nfs4_schedule_state_manager(clp);
L
Linus Torvalds 已提交
1192
}
A
Andy Adamson 已提交
1193
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
L
Linus Torvalds 已提交
1194

1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
/**
 * nfs4_schedule_migration_recovery - trigger migration recovery
 *
 * @server: FSID that is migrating
 *
 * Returns zero if recovery has started, otherwise a negative NFS4ERR
 * value is returned.
 */
int nfs4_schedule_migration_recovery(const struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;

	if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
		pr_err("NFS: volatile file handles not supported (server %s)\n",
				clp->cl_hostname);
		return -NFS4ERR_IO;
	}

	if (test_bit(NFS_MIG_FAILED, &server->mig_status))
		return -NFS4ERR_IO;

	dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
			__func__,
			(unsigned long long)server->fsid.major,
			(unsigned long long)server->fsid.minor,
			clp->cl_hostname);

	set_bit(NFS_MIG_IN_TRANSITION,
			&((struct nfs_server *)server)->mig_status);
	set_bit(NFS4CLNT_MOVED, &clp->cl_state);

	nfs4_schedule_state_manager(clp);
	return 0;
}
EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);

1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
/**
 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
 *
 * @clp: server to check for moved leases
 *
 */
void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
{
	dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
		__func__, clp->cl_clientid, clp->cl_hostname);

	set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
	nfs4_schedule_state_manager(clp);
}
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);

1247 1248 1249 1250 1251 1252
int nfs4_wait_clnt_recover(struct nfs_client *clp)
{
	int res;

	might_sleep();

1253
	atomic_inc(&clp->cl_count);
1254 1255 1256
	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
			nfs_wait_bit_killable, TASK_KILLABLE);
	if (res)
1257
		goto out;
1258
	if (clp->cl_cons_state < 0)
1259 1260 1261 1262
		res = clp->cl_cons_state;
out:
	nfs_put_client(clp);
	return res;
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
}

int nfs4_client_recover_expired_lease(struct nfs_client *clp)
{
	unsigned int loop;
	int ret;

	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
		ret = nfs4_wait_clnt_recover(clp);
		if (ret != 0)
			break;
		if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
		    !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
			break;
		nfs4_schedule_state_manager(clp);
		ret = -EIO;
	}
	return ret;
}

1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
/*
 * 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);
1295 1296
	dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
			clp->cl_hostname);
1297 1298
}

1299 1300
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
{
1301
	nfs40_handle_cb_pathdown(clp);
1302 1303 1304
	nfs4_schedule_state_manager(clp);
}

1305
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1306 1307 1308 1309 1310 1311 1312 1313
{

	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;
	}
1314
	set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1315 1316 1317 1318
	set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
	return 1;
}

1319
int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1320 1321 1322
{
	set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
	clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1323
	set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1324 1325 1326 1327
	set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
	return 1;
}

1328
int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1329 1330 1331
{
	struct nfs_client *clp = server->nfs_client;

1332 1333
	if (!nfs4_valid_open_stateid(state))
		return -EBADF;
1334
	nfs4_state_mark_reclaim_nograce(clp, state);
1335 1336
	dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
			clp->cl_hostname);
1337
	nfs4_schedule_state_manager(clp);
1338
	return 0;
1339
}
A
Andy Adamson 已提交
1340
EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1341

1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
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;
1358
		if (!nfs4_stateid_match(&state->stateid, stateid))
1359 1360 1361 1362 1363 1364 1365 1366 1367
			continue;
		nfs4_state_mark_reclaim_nograce(clp, state);
		found = true;
	}
	spin_unlock(&inode->i_lock);
	if (found)
		nfs4_schedule_state_manager(clp);
}

1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
{
	struct inode *inode = state->inode;
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs_open_context *ctx;

	spin_lock(&inode->i_lock);
	list_for_each_entry(ctx, &nfsi->open_files, list) {
		if (ctx->state != state)
			continue;
		set_bit(NFS_CONTEXT_BAD, &ctx->flags);
	}
	spin_unlock(&inode->i_lock);
}

1383 1384 1385
static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
{
	set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1386
	nfs4_state_mark_open_context_bad(state);
1387 1388
}

1389

1390
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1391 1392
{
	struct inode *inode = state->inode;
1393
	struct nfs_inode *nfsi = NFS_I(inode);
L
Linus Torvalds 已提交
1394 1395 1396
	struct file_lock *fl;
	int status = 0;

1397 1398 1399 1400
	if (inode->i_flock == NULL)
		return 0;

	/* Guard against delegation returns and new lock/unlock calls */
1401
	down_write(&nfsi->rwsem);
1402
	/* Protect inode->i_flock using the BKL */
1403
	spin_lock(&inode->i_lock);
H
Harvey Harrison 已提交
1404
	for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1405
		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
L
Linus Torvalds 已提交
1406
			continue;
1407
		if (nfs_file_open_context(fl->fl_file)->state != state)
L
Linus Torvalds 已提交
1408
			continue;
1409
		spin_unlock(&inode->i_lock);
L
Linus Torvalds 已提交
1410 1411
		status = ops->recover_lock(state, fl);
		switch (status) {
1412 1413 1414 1415 1416 1417 1418 1419 1420
			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:
1421 1422 1423 1424
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1425
				goto out;
L
Linus Torvalds 已提交
1426
			default:
1427 1428
				printk(KERN_ERR "NFS: %s: unhandled error %d\n",
					 __func__, status);
1429 1430
			case -ENOMEM:
			case -NFS4ERR_DENIED:
L
Linus Torvalds 已提交
1431 1432
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1433
				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
1434
				status = 0;
L
Linus Torvalds 已提交
1435
		}
1436
		spin_lock(&inode->i_lock);
L
Linus Torvalds 已提交
1437
	}
1438
	spin_unlock(&inode->i_lock);
1439
out:
1440
	up_write(&nfsi->rwsem);
L
Linus Torvalds 已提交
1441 1442 1443
	return status;
}

1444
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
{
	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.
	 */
1458
	spin_lock(&sp->so_lock);
1459 1460
	write_seqcount_begin(&sp->so_reclaim_seqcount);
restart:
L
Linus Torvalds 已提交
1461
	list_for_each_entry(state, &sp->so_states, open_states) {
1462 1463
		if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
			continue;
1464 1465
		if (!nfs4_valid_open_stateid(state))
			continue;
L
Linus Torvalds 已提交
1466 1467
		if (state->state == 0)
			continue;
1468 1469
		atomic_inc(&state->count);
		spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1470 1471
		status = ops->recover_open(sp, state);
		if (status >= 0) {
1472 1473
			status = nfs4_reclaim_locks(state, ops);
			if (status >= 0) {
1474
				if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1475 1476 1477 1478 1479 1480 1481 1482
					spin_lock(&state->state_lock);
					list_for_each_entry(lock, &state->lock_states, ls_locks) {
						if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
							pr_warn_ratelimited("NFS: "
									    "%s: Lock reclaim "
									    "failed!\n", __func__);
					}
					spin_unlock(&state->state_lock);
1483
				}
1484
				nfs4_put_open_state(state);
1485
				spin_lock(&sp->so_lock);
1486
				goto restart;
L
Linus Torvalds 已提交
1487 1488 1489 1490
			}
		}
		switch (status) {
			default:
1491 1492
				printk(KERN_ERR "NFS: %s: unhandled error %d\n",
					__func__, status);
L
Linus Torvalds 已提交
1493
			case -ENOENT:
1494
			case -ENOMEM:
1495
			case -ESTALE:
1496
				/* Open state on this file cannot be recovered */
1497
				nfs4_state_mark_recovery_failed(state, status);
L
Linus Torvalds 已提交
1498
				break;
1499 1500
			case -EAGAIN:
				ssleep(1);
1501 1502 1503
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_BAD_STATEID:
1504 1505
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1506
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1507
				break;
L
Linus Torvalds 已提交
1508 1509
			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
1510
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
L
Linus Torvalds 已提交
1511
			case -NFS4ERR_STALE_CLIENTID:
1512 1513 1514 1515
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
L
Linus Torvalds 已提交
1516 1517
				goto out_err;
		}
1518
		nfs4_put_open_state(state);
1519
		spin_lock(&sp->so_lock);
1520
		goto restart;
L
Linus Torvalds 已提交
1521
	}
1522
	write_seqcount_end(&sp->so_reclaim_seqcount);
1523
	spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1524 1525
	return 0;
out_err:
1526
	nfs4_put_open_state(state);
1527 1528 1529
	spin_lock(&sp->so_lock);
	write_seqcount_end(&sp->so_reclaim_seqcount);
	spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1530 1531 1532
	return status;
}

1533 1534 1535 1536 1537 1538 1539 1540
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);
1541
	spin_lock(&state->state_lock);
1542 1543
	list_for_each_entry(lock, &state->lock_states, ls_locks) {
		lock->ls_seqid.flags = 0;
1544
		clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1545
	}
1546
	spin_unlock(&state->state_lock);
1547 1548
}

1549 1550
static void nfs4_reset_seqids(struct nfs_server *server,
	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1551
{
1552
	struct nfs_client *clp = server->nfs_client;
1553
	struct nfs4_state_owner *sp;
1554
	struct rb_node *pos;
1555 1556
	struct nfs4_state *state;

1557 1558 1559 1560 1561
	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);
1562
		sp->so_seqid.flags = 0;
1563
		spin_lock(&sp->so_lock);
1564
		list_for_each_entry(state, &sp->so_states, open_states) {
1565 1566
			if (mark_reclaim(clp, state))
				nfs4_clear_open_state(state);
1567
		}
1568
		spin_unlock(&sp->so_lock);
1569
	}
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
	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();
1582 1583
}

1584 1585 1586 1587 1588 1589 1590
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);
}

1591
static void nfs4_reclaim_complete(struct nfs_client *clp,
1592 1593
				 const struct nfs4_state_recovery_ops *ops,
				 struct rpc_cred *cred)
1594 1595 1596
{
	/* Notify the server we're done reclaiming our state */
	if (ops->reclaim_complete)
1597
		(void)ops->reclaim_complete(clp, cred);
1598 1599
}

1600
static void nfs4_clear_reclaim_server(struct nfs_server *server)
1601
{
1602
	struct nfs_client *clp = server->nfs_client;
1603 1604 1605 1606
	struct nfs4_state_owner *sp;
	struct rb_node *pos;
	struct nfs4_state *state;

1607 1608 1609 1610 1611
	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);
1612 1613
		spin_lock(&sp->so_lock);
		list_for_each_entry(state, &sp->so_states, open_states) {
1614 1615
			if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
						&state->flags))
1616 1617 1618 1619 1620
				continue;
			nfs4_state_mark_reclaim_nograce(clp, state);
		}
		spin_unlock(&sp->so_lock);
	}
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	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();
1635 1636

	nfs_delegation_reap_unclaimed(clp);
1637 1638 1639 1640 1641
	return 1;
}

static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
{
1642 1643 1644
	const struct nfs4_state_recovery_ops *ops;
	struct rpc_cred *cred;

1645 1646
	if (!nfs4_state_clear_reclaim_reboot(clp))
		return;
1647
	ops = clp->cl_mvops->reboot_recovery_ops;
1648
	cred = nfs4_get_clid_cred(clp);
1649 1650
	nfs4_reclaim_complete(clp, ops, cred);
	put_rpccred(cred);
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
}

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);
}

1665
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1666 1667
{
	switch (error) {
1668 1669
		case 0:
			break;
1670
		case -NFS4ERR_CB_PATH_DOWN:
1671
			nfs40_handle_cb_pathdown(clp);
1672
			break;
1673 1674
		case -NFS4ERR_NO_GRACE:
			nfs4_state_end_reclaim_reboot(clp);
1675
			break;
1676 1677
		case -NFS4ERR_STALE_CLIENTID:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1678
			nfs4_state_clear_reclaim_reboot(clp);
1679 1680 1681 1682 1683
			nfs4_state_start_reclaim_reboot(clp);
			break;
		case -NFS4ERR_EXPIRED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
			nfs4_state_start_reclaim_nograce(clp);
1684
			break;
1685 1686 1687 1688 1689 1690
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
1691
			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1692
			/* Zero session reset errors */
1693
			break;
1694 1695 1696
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
			set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
			break;
1697
		default:
1698 1699
			dprintk("%s: failed to handle error %d for server %s\n",
					__func__, error, clp->cl_hostname);
1700
			return error;
1701
	}
1702 1703
	dprintk("%s: handled error %d for server %s\n", __func__, error,
			clp->cl_hostname);
1704
	return 0;
1705 1706
}

1707
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1708
{
1709 1710
	struct nfs4_state_owner *sp;
	struct nfs_server *server;
1711
	struct rb_node *pos;
L
Linus Torvalds 已提交
1712 1713
	int status = 0;

1714
restart:
1715 1716
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1717
		nfs4_purge_state_owners(server);
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
		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);
			}

1738
			nfs4_put_state_owner(sp);
1739
			goto restart;
1740
		}
1741
		spin_unlock(&clp->cl_lock);
1742
	}
1743
	rcu_read_unlock();
1744 1745 1746 1747 1748 1749
	return status;
}

static int nfs4_check_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
1750 1751
	const struct nfs4_state_maintenance_ops *ops =
		clp->cl_mvops->state_renewal_ops;
1752
	int status;
L
Linus Torvalds 已提交
1753

1754 1755 1756
	/* Is the client already known to have an expired lease? */
	if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		return 0;
1757 1758 1759
	spin_lock(&clp->cl_lock);
	cred = ops->get_state_renewal_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
1760
	if (cred == NULL) {
1761
		cred = nfs4_get_clid_cred(clp);
1762
		status = -ENOKEY;
1763 1764
		if (cred == NULL)
			goto out;
1765
	}
1766
	status = ops->renew_lease(clp, cred);
1767
	put_rpccred(cred);
1768 1769 1770 1771
	if (status == -ETIMEDOUT) {
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
		return 0;
	}
1772
out:
1773
	return nfs4_recovery_handle_error(clp, status);
1774 1775
}

1776 1777
/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
 * and for recoverable errors on EXCHANGE_ID for v4.1
1778 1779 1780 1781
 */
static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
{
	switch (status) {
1782 1783 1784 1785 1786
	case -NFS4ERR_SEQ_MISORDERED:
		if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
			return -ESERVERFAULT;
		/* Lease confirmation error: retry after purging the lease */
		ssleep(1);
1787 1788
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
		break;
1789 1790
	case -NFS4ERR_STALE_CLIENTID:
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1791 1792
		nfs4_state_clear_reclaim_reboot(clp);
		nfs4_state_start_reclaim_reboot(clp);
1793
		break;
1794 1795 1796 1797 1798 1799
	case -NFS4ERR_CLID_INUSE:
		pr_err("NFS: Server %s reports our clientid is in use\n",
			clp->cl_hostname);
		nfs_mark_client_ready(clp, -EPERM);
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
		return -EPERM;
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
	case -EACCES:
	case -NFS4ERR_DELAY:
	case -ETIMEDOUT:
	case -EAGAIN:
		ssleep(1);
		break;

	case -NFS4ERR_MINOR_VERS_MISMATCH:
		if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
			nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1810 1811
		dprintk("%s: exit with error %d for server %s\n",
				__func__, -EPROTONOSUPPORT, clp->cl_hostname);
1812 1813 1814 1815
		return -EPROTONOSUPPORT;
	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
				 * in nfs4_exchange_id */
	default:
1816 1817
		dprintk("%s: exit with error %d for server %s\n", __func__,
				status, clp->cl_hostname);
1818 1819 1820
		return status;
	}
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1821 1822
	dprintk("%s: handled error %d for server %s\n", __func__, status,
			clp->cl_hostname);
1823 1824 1825
	return 0;
}

1826
static int nfs4_establish_lease(struct nfs_client *clp)
1827 1828
{
	struct rpc_cred *cred;
1829 1830
	const struct nfs4_state_recovery_ops *ops =
		clp->cl_mvops->reboot_recovery_ops;
1831
	int status;
1832

1833
	cred = nfs4_get_clid_cred(clp);
1834 1835 1836 1837 1838
	if (cred == NULL)
		return -ENOENT;
	status = ops->establish_clid(clp, cred);
	put_rpccred(cred);
	if (status != 0)
1839 1840 1841 1842 1843
		return status;
	pnfs_destroy_all_layouts(clp);
	return 0;
}

1844 1845 1846 1847
/*
 * Returns zero or a negative errno.  NFS4ERR values are converted
 * to local errno values.
 */
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869
static int nfs4_reclaim_lease(struct nfs_client *clp)
{
	int status;

	status = nfs4_establish_lease(clp);
	if (status < 0)
		return nfs4_handle_reclaim_lease_error(clp, status);
	if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
		nfs4_state_start_reclaim_nograce(clp);
	if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
		set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
	clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
	clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
	return 0;
}

static int nfs4_purge_lease(struct nfs_client *clp)
{
	int status;

	status = nfs4_establish_lease(clp);
	if (status < 0)
1870
		return nfs4_handle_reclaim_lease_error(clp, status);
1871 1872 1873
	clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
	nfs4_state_start_reclaim_nograce(clp);
1874
	return 0;
1875 1876
}

1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
/*
 * Try remote migration of one FSID from a source server to a
 * destination server.  The source server provides a list of
 * potential destinations.
 *
 * Returns zero or a negative NFS4ERR status code.
 */
static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
{
	struct nfs_client *clp = server->nfs_client;
	struct nfs4_fs_locations *locations = NULL;
	struct inode *inode;
	struct page *page;
	int status, result;

	dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
			(unsigned long long)server->fsid.major,
			(unsigned long long)server->fsid.minor,
			clp->cl_hostname);

	result = 0;
	page = alloc_page(GFP_KERNEL);
	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
	if (page == NULL || locations == NULL) {
		dprintk("<-- %s: no memory\n", __func__);
		goto out;
	}

	inode = server->super->s_root->d_inode;
	result = nfs4_proc_get_locations(inode, locations, page, cred);
	if (result) {
		dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
			__func__, result);
		goto out;
	}

	result = -NFS4ERR_NXIO;
	if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
		dprintk("<-- %s: No fs_locations data, migration skipped\n",
			__func__);
		goto out;
	}

	nfs4_begin_drain_session(clp);

	status = nfs4_replace_transport(server, locations);
	if (status != 0) {
		dprintk("<-- %s: failed to replace transport: %d\n",
			__func__, status);
		goto out;
	}

	result = 0;
	dprintk("<-- %s: migration succeeded\n", __func__);

out:
	if (page != NULL)
		__free_page(page);
	kfree(locations);
	if (result) {
		pr_err("NFS: migration recovery failed (server %s)\n",
				clp->cl_hostname);
		set_bit(NFS_MIG_FAILED, &server->mig_status);
	}
	return result;
}

/*
 * Returns zero or a negative NFS4ERR status code.
 */
static int nfs4_handle_migration(struct nfs_client *clp)
{
	const struct nfs4_state_maintenance_ops *ops =
				clp->cl_mvops->state_renewal_ops;
	struct nfs_server *server;
	struct rpc_cred *cred;

	dprintk("%s: migration reported on \"%s\"\n", __func__,
			clp->cl_hostname);

	spin_lock(&clp->cl_lock);
	cred = ops->get_state_renewal_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
	if (cred == NULL)
		return -NFS4ERR_NOENT;

	clp->cl_mig_gen++;
restart:
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		int status;

		if (server->mig_gen == clp->cl_mig_gen)
			continue;
		server->mig_gen = clp->cl_mig_gen;

		if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
						&server->mig_status))
			continue;

		rcu_read_unlock();
		status = nfs4_try_migration(server, cred);
		if (status < 0) {
			put_rpccred(cred);
			return status;
		}
		goto restart;
	}
	rcu_read_unlock();
	put_rpccred(cred);
	return 0;
}

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038
/*
 * Test each nfs_server on the clp's cl_superblocks list to see
 * if it's moved to another server.  Stop when the server no longer
 * returns NFS4ERR_LEASE_MOVED.
 */
static int nfs4_handle_lease_moved(struct nfs_client *clp)
{
	const struct nfs4_state_maintenance_ops *ops =
				clp->cl_mvops->state_renewal_ops;
	struct nfs_server *server;
	struct rpc_cred *cred;

	dprintk("%s: lease moved reported on \"%s\"\n", __func__,
			clp->cl_hostname);

	spin_lock(&clp->cl_lock);
	cred = ops->get_state_renewal_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
	if (cred == NULL)
		return -NFS4ERR_NOENT;

	clp->cl_mig_gen++;
restart:
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		struct inode *inode;
		int status;

		if (server->mig_gen == clp->cl_mig_gen)
			continue;
		server->mig_gen = clp->cl_mig_gen;

		rcu_read_unlock();

		inode = server->super->s_root->d_inode;
		status = nfs4_proc_fsid_present(inode, cred);
		if (status != -NFS4ERR_MOVED)
			goto restart;	/* wasn't this one */
		if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
			goto restart;	/* there are more */
		goto out;
	}
	rcu_read_unlock();

out:
	put_rpccred(cred);
	return 0;
}

2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058
/**
 * nfs4_discover_server_trunking - Detect server IP address trunking
 *
 * @clp: nfs_client under test
 * @result: OUT: found nfs_client, or clp
 *
 * Returns zero or a negative errno.  If zero is returned,
 * an nfs_client pointer is planted in "result".
 *
 * Note: since we are invoked in process context, and
 * not from inside the state manager, we cannot use
 * nfs4_handle_reclaim_lease_error().
 */
int nfs4_discover_server_trunking(struct nfs_client *clp,
				  struct nfs_client **result)
{
	const struct nfs4_state_recovery_ops *ops =
				clp->cl_mvops->reboot_recovery_ops;
	struct rpc_clnt *clnt;
	struct rpc_cred *cred;
2059
	int i, status;
2060 2061 2062 2063 2064 2065 2066 2067

	dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);

	clnt = clp->cl_rpcclient;
	i = 0;

	mutex_lock(&nfs_clid_init_mutex);
again:
2068
	status  = -ENOENT;
2069
	cred = nfs4_get_clid_cred(clp);
2070 2071 2072 2073 2074 2075 2076 2077 2078
	if (cred == NULL)
		goto out_unlock;

	status = ops->detect_trunking(clp, result, cred);
	put_rpccred(cred);
	switch (status) {
	case 0:
		break;
	case -ETIMEDOUT:
2079 2080 2081
		if (clnt->cl_softrtry)
			break;
	case -NFS4ERR_DELAY:
2082 2083
	case -EAGAIN:
		ssleep(1);
2084
	case -NFS4ERR_STALE_CLIENTID:
2085 2086 2087
		dprintk("NFS: %s after status %d, retrying\n",
			__func__, status);
		goto again;
2088
	case -EACCES:
2089 2090 2091 2092
		if (i++ == 0) {
			nfs4_root_machine_cred(clp);
			goto again;
		}
2093
		if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2094
			break;
2095 2096
	case -NFS4ERR_CLID_INUSE:
	case -NFS4ERR_WRONGSEC:
2097 2098 2099 2100 2101
		/* No point in retrying if we already used RPC_AUTH_UNIX */
		if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
			status = -EPERM;
			break;
		}
2102
		clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2103 2104 2105 2106
		if (IS_ERR(clnt)) {
			status = PTR_ERR(clnt);
			break;
		}
2107 2108 2109 2110 2111 2112 2113
		/* Note: this is safe because we haven't yet marked the
		 * client as ready, so we are the only user of
		 * clp->cl_rpcclient
		 */
		clnt = xchg(&clp->cl_rpcclient, clnt);
		rpc_shutdown_client(clnt);
		clnt = clp->cl_rpcclient;
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123
		goto again;

	case -NFS4ERR_MINOR_VERS_MISMATCH:
		status = -EPROTONOSUPPORT;
		break;

	case -EKEYEXPIRED:
	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
				 * in nfs4_exchange_id */
		status = -EKEYEXPIRED;
2124 2125 2126 2127 2128
		break;
	default:
		pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
				__func__, status);
		status = -EIO;
2129 2130 2131 2132 2133 2134 2135 2136
	}

out_unlock:
	mutex_unlock(&nfs_clid_init_mutex);
	dprintk("NFS: %s: status = %d\n", __func__, status);
	return status;
}

2137
#ifdef CONFIG_NFS_V4_1
2138
void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2139
{
2140 2141
	struct nfs_client *clp = session->clp;

2142 2143 2144 2145 2146 2147 2148
	switch (err) {
	default:
		set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
		break;
	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
		set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
	}
2149
	nfs4_schedule_lease_recovery(clp);
2150
}
2151
EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2152

2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
static void nfs41_ping_server(struct nfs_client *clp)
{
	/* Use CHECK_LEASE to ping the server with a SEQUENCE */
	set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
	nfs4_schedule_state_manager(clp);
}

void nfs41_server_notify_target_slotid_update(struct nfs_client *clp)
{
	nfs41_ping_server(clp);
}

2165 2166 2167 2168 2169
void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
{
	nfs41_ping_server(clp);
}

2170 2171 2172
static void nfs4_reset_all_state(struct nfs_client *clp)
{
	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2173
		set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2174
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2175
		nfs4_state_start_reclaim_nograce(clp);
2176 2177
		dprintk("%s: scheduling reset of all state for server %s!\n",
				__func__, clp->cl_hostname);
2178
		nfs4_schedule_state_manager(clp);
2179 2180 2181 2182 2183 2184 2185
	}
}

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);
2186 2187
		dprintk("%s: server %s rebooted!\n", __func__,
				clp->cl_hostname);
2188
		nfs4_schedule_state_manager(clp);
2189 2190 2191 2192 2193 2194
	}
}

static void nfs41_handle_state_revoked(struct nfs_client *clp)
{
	nfs4_reset_all_state(clp);
2195
	dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2196 2197 2198 2199 2200 2201
}

static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
{
	/* This will need to handle layouts too */
	nfs_expire_all_delegations(clp);
2202 2203
	dprintk("%s: Recallable state revoked on server %s!\n", __func__,
			clp->cl_hostname);
2204 2205
}

2206
static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2207 2208 2209
{
	nfs_expire_all_delegations(clp);
	if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
2210
		nfs4_schedule_state_manager(clp);
2211 2212
	dprintk("%s: server %s declared a backchannel fault\n", __func__,
			clp->cl_hostname);
2213 2214
}

2215 2216 2217 2218 2219 2220 2221
static void nfs41_handle_cb_path_down(struct nfs_client *clp)
{
	if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
		&clp->cl_state) == 0)
		nfs4_schedule_state_manager(clp);
}

2222 2223 2224 2225
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
{
	if (!flags)
		return;
2226 2227 2228 2229

	dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
		__func__, clp->cl_hostname, clp->cl_clientid, flags);

2230
	if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2231
		nfs41_handle_server_reboot(clp);
2232
	if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2233
			    SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
C
Chuck Lever 已提交
2234
			    SEQ4_STATUS_ADMIN_STATE_REVOKED))
2235
		nfs41_handle_state_revoked(clp);
C
Chuck Lever 已提交
2236 2237
	if (flags & SEQ4_STATUS_LEASE_MOVED)
		nfs4_schedule_lease_moved_recovery(clp);
2238
	if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2239
		nfs41_handle_recallable_state_revoked(clp);
2240 2241 2242 2243
	if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
		nfs41_handle_backchannel_fault(clp);
	else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
				SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2244
		nfs41_handle_cb_path_down(clp);
2245 2246
}

2247 2248
static int nfs4_reset_session(struct nfs_client *clp)
{
2249
	struct rpc_cred *cred;
2250 2251
	int status;

2252 2253
	if (!nfs4_has_session(clp))
		return 0;
2254
	nfs4_begin_drain_session(clp);
2255
	cred = nfs4_get_clid_cred(clp);
2256
	status = nfs4_proc_destroy_session(clp->cl_session, cred);
2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268
	switch (status) {
	case 0:
	case -NFS4ERR_BADSESSION:
	case -NFS4ERR_DEADSESSION:
		break;
	case -NFS4ERR_BACK_CHAN_BUSY:
	case -NFS4ERR_DELAY:
		set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
		status = 0;
		ssleep(1);
		goto out;
	default:
2269
		status = nfs4_recovery_handle_error(clp, status);
2270 2271 2272 2273
		goto out;
	}

	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2274
	status = nfs4_proc_create_session(clp, cred);
2275
	if (status) {
2276 2277
		dprintk("%s: session reset failed with status %d for server %s!\n",
			__func__, status, clp->cl_hostname);
2278
		status = nfs4_handle_reclaim_lease_error(clp, status);
2279 2280
		goto out;
	}
2281
	nfs41_finish_session_reset(clp);
2282 2283
	dprintk("%s: session reset was successful for server %s!\n",
			__func__, clp->cl_hostname);
2284
out:
2285 2286
	if (cred)
		put_rpccred(cred);
2287 2288
	return status;
}
2289

2290 2291
static int nfs4_bind_conn_to_session(struct nfs_client *clp)
{
2292 2293 2294
	struct rpc_cred *cred;
	int ret;

2295 2296
	if (!nfs4_has_session(clp))
		return 0;
2297
	nfs4_begin_drain_session(clp);
2298
	cred = nfs4_get_clid_cred(clp);
2299 2300 2301
	ret = nfs4_proc_bind_conn_to_session(clp, cred);
	if (cred)
		put_rpccred(cred);
2302
	clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2303 2304
	switch (ret) {
	case 0:
2305 2306
		dprintk("%s: bind_conn_to_session was successful for server %s!\n",
			__func__, clp->cl_hostname);
2307 2308 2309 2310 2311 2312 2313 2314 2315
		break;
	case -NFS4ERR_DELAY:
		ssleep(1);
		set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
		break;
	default:
		return nfs4_recovery_handle_error(clp, ret);
	}
	return 0;
2316
}
2317
#else /* CONFIG_NFS_V4_1 */
2318
static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2319 2320 2321 2322 2323

static int nfs4_bind_conn_to_session(struct nfs_client *clp)
{
	return 0;
}
2324 2325
#endif /* CONFIG_NFS_V4_1 */

2326
static void nfs4_state_manager(struct nfs_client *clp)
2327 2328
{
	int status = 0;
2329
	const char *section = "", *section_sep = "";
2330 2331

	/* Ensure exclusive access to NFSv4 state */
2332
	do {
2333
		if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2334
			section = "purge state";
2335
			status = nfs4_purge_lease(clp);
2336 2337
			if (status < 0)
				goto out_error;
2338
			continue;
2339 2340
		}

2341
		if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2342
			section = "lease expired";
2343 2344
			/* We're going to have to re-establish a clientid */
			status = nfs4_reclaim_lease(clp);
2345
			if (status < 0)
2346
				goto out_error;
2347
			continue;
2348 2349
		}

2350
		/* Initialize or reset the session */
2351
		if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2352
			section = "reset session";
2353
			status = nfs4_reset_session(clp);
2354 2355 2356
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
				continue;
			if (status < 0)
2357 2358
				goto out_error;
		}
2359

2360 2361
		/* Send BIND_CONN_TO_SESSION */
		if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2362
				&clp->cl_state)) {
2363
			section = "bind conn to session";
2364 2365 2366
			status = nfs4_bind_conn_to_session(clp);
			if (status < 0)
				goto out_error;
2367
			continue;
2368 2369
		}

2370 2371 2372 2373 2374
		if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
			section = "check lease";
			status = nfs4_check_lease(clp);
			if (status < 0)
				goto out_error;
2375 2376 2377 2378 2379 2380 2381
		}

		if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
			section = "migration";
			status = nfs4_handle_migration(clp);
			if (status < 0)
				goto out_error;
2382 2383
		}

2384 2385 2386 2387 2388 2389 2390
		if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
			section = "lease moved";
			status = nfs4_handle_lease_moved(clp);
			if (status < 0)
				goto out_error;
		}

2391
		/* First recover reboot state... */
2392
		if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2393
			section = "reclaim reboot";
2394
			status = nfs4_do_reclaim(clp,
2395
				clp->cl_mvops->reboot_recovery_ops);
2396
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2397
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2398
				continue;
2399
			nfs4_state_end_reclaim_reboot(clp);
2400 2401 2402 2403
			if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
				continue;
			if (status < 0)
				goto out_error;
2404 2405
		}

2406 2407
		/* Now recover expired state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2408
			section = "reclaim nograce";
2409
			status = nfs4_do_reclaim(clp,
2410
				clp->cl_mvops->nograce_recovery_ops);
2411
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2412
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2413 2414 2415
			    test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
				continue;
			if (status < 0)
2416
				goto out_error;
L
Linus Torvalds 已提交
2417
		}
2418

2419
		nfs4_end_drain_session(clp);
2420 2421 2422 2423
		if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
			nfs_client_return_marked_delegations(clp);
			continue;
		}
2424 2425

		nfs4_clear_state_manager_bit(clp);
2426 2427 2428 2429 2430
		/* 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;
2431
	} while (atomic_read(&clp->cl_count) > 1);
2432
	return;
L
Linus Torvalds 已提交
2433
out_error:
2434 2435 2436 2437 2438
	if (strlen(section))
		section_sep = ": ";
	pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
			" with error %d\n", section_sep, section,
			clp->cl_hostname, -status);
2439
	ssleep(1);
2440
	nfs4_end_drain_session(clp);
2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
	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
2453 2454 2455 2456 2457 2458 2459
}

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