nfs4state.c 63.9 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 <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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		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;

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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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855 856 857 858 859
/*
 * 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;
L
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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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	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
Linus Torvalds 已提交
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;
L
Linus Torvalds 已提交
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);
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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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950 951
}

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);
976 977 978 979
		ret = 0;
		smp_rmb();
		if (!list_empty(&lsp->ls_seqid.list))
			ret = -EWOULDBLOCK;
980
	}
981
	spin_unlock(&state->state_lock);
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982
	nfs4_put_lock_state(lsp);
983 984 985 986
out:
	return ret;
}

987
static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
988
{
989
	const nfs4_stateid *src;
990
	int ret;
991 992 993
	int seq;

	do {
994
		src = &zero_stateid;
995
		seq = read_seqbegin(&state->seqlock);
996 997 998
		if (test_bit(NFS_OPEN_STATE, &state->flags))
			src = &state->open_stateid;
		nfs4_stateid_copy(dst, src);
999 1000 1001 1002
		ret = 0;
		smp_rmb();
		if (!list_empty(&state->owner->so_seqid.list))
			ret = -EWOULDBLOCK;
1003
	} while (read_seqretry(&state->seqlock, seq));
1004
	return ret;
1005 1006 1007 1008 1009 1010
}

/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
 */
1011
int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1012
		fmode_t fmode, const struct nfs_lockowner *lockowner)
1013
{
1014 1015 1016 1017
	int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
	if (ret == -EIO)
		/* A lost lock - don't even consider delegations */
		goto out;
1018
	if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
1019 1020
		goto out;
	if (ret != -ENOENT)
1021 1022 1023 1024
		/* nfs4_copy_delegation_stateid() didn't over-write
		 * dst, so it still has the lock stateid which we now
		 * choose to use.
		 */
1025 1026 1027
		goto out;
	ret = nfs4_copy_open_stateid(dst, state);
out:
1028 1029
	if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
		dst->seqid = 0;
1030
	return ret;
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1031 1032
}

1033
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1034 1035 1036
{
	struct nfs_seqid *new;

1037
	new = kmalloc(sizeof(*new), gfp_mask);
1038 1039
	if (new != NULL) {
		new->sequence = counter;
1040
		INIT_LIST_HEAD(&new->list);
1041
		new->task = NULL;
1042 1043 1044 1045
	}
	return new;
}

1046
void nfs_release_seqid(struct nfs_seqid *seqid)
L
Linus Torvalds 已提交
1047
{
1048
	struct nfs_seqid_counter *sequence;
1049

1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
	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);
1061
	}
1062
	spin_unlock(&sequence->lock);
1063 1064 1065 1066 1067
}

void nfs_free_seqid(struct nfs_seqid *seqid)
{
	nfs_release_seqid(seqid);
1068
	kfree(seqid);
L
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1069 1070 1071
}

/*
1072 1073 1074 1075
 * 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()
 */
1076
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1077 1078 1079 1080 1081
{
	switch (status) {
		case 0:
			break;
		case -NFS4ERR_BAD_SEQID:
1082 1083
			if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
				return;
1084
			pr_warn_ratelimited("NFS: v4 server returned a bad"
D
Dan Muntz 已提交
1085 1086
					" sequence-id error on an"
					" unconfirmed sequence %p!\n",
1087
					seqid->sequence);
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
		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)
{
1106 1107 1108 1109 1110
	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
1111
		nfs4_drop_state_owner(sp);
1112 1113
	if (!nfs4_has_session(server->nfs_client))
		nfs_increment_seqid(status, seqid);
1114 1115 1116 1117 1118 1119 1120 1121 1122
}

/*
 * 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)
{
1123
	nfs_increment_seqid(status, seqid);
1124 1125 1126 1127
}

int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
{
1128
	struct nfs_seqid_counter *sequence = seqid->sequence;
1129 1130 1131
	int status = 0;

	spin_lock(&sequence->lock);
1132
	seqid->task = task;
1133 1134 1135 1136
	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;
1137
	rpc_sleep_on(&sequence->wait, task, NULL);
1138 1139
	status = -EAGAIN;
unlock:
1140 1141
	spin_unlock(&sequence->lock);
	return status;
L
Linus Torvalds 已提交
1142 1143
}

1144
static int nfs4_run_state_manager(void *);
L
Linus Torvalds 已提交
1145

1146
static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
T
Trond Myklebust 已提交
1147 1148
{
	smp_mb__before_clear_bit();
1149
	clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
T
Trond Myklebust 已提交
1150
	smp_mb__after_clear_bit();
1151
	wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
T
Trond Myklebust 已提交
1152 1153 1154
	rpc_wake_up(&clp->cl_rpcwaitq);
}

L
Linus Torvalds 已提交
1155
/*
1156
 * Schedule the nfs_client asynchronous state management routine
L
Linus Torvalds 已提交
1157
 */
1158
void nfs4_schedule_state_manager(struct nfs_client *clp)
L
Linus Torvalds 已提交
1159
{
1160
	struct task_struct *task;
1161
	char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
L
Linus Torvalds 已提交
1162

1163 1164
	if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
		return;
1165 1166
	__module_get(THIS_MODULE);
	atomic_inc(&clp->cl_count);
1167 1168 1169 1170 1171 1172 1173 1174

	/* 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();
1175
	task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1176 1177 1178 1179 1180 1181 1182
	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
1183 1184 1185
}

/*
1186
 * Schedule a lease recovery attempt
L
Linus Torvalds 已提交
1187
 */
1188
void nfs4_schedule_lease_recovery(struct nfs_client *clp)
L
Linus Torvalds 已提交
1189 1190 1191
{
	if (!clp)
		return;
1192 1193
	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1194 1195
	dprintk("%s: scheduling lease recovery for server %s\n", __func__,
			clp->cl_hostname);
1196
	nfs4_schedule_state_manager(clp);
L
Linus Torvalds 已提交
1197
}
A
Andy Adamson 已提交
1198
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
L
Linus Torvalds 已提交
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 1231 1232 1233 1234 1235
/**
 * 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);

1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
/**
 * 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);

1252 1253 1254 1255 1256 1257
int nfs4_wait_clnt_recover(struct nfs_client *clp)
{
	int res;

	might_sleep();

1258
	atomic_inc(&clp->cl_count);
1259 1260 1261
	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
			nfs_wait_bit_killable, TASK_KILLABLE);
	if (res)
1262
		goto out;
1263
	if (clp->cl_cons_state < 0)
1264 1265 1266 1267
		res = clp->cl_cons_state;
out:
	nfs_put_client(clp);
	return res;
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
}

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;
}

1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
/*
 * 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);
1300 1301
	dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
			clp->cl_hostname);
1302 1303
}

1304 1305
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
{
1306
	nfs40_handle_cb_pathdown(clp);
1307 1308 1309
	nfs4_schedule_state_manager(clp);
}

1310
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1311 1312 1313 1314 1315 1316 1317 1318
{

	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;
	}
1319
	set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1320 1321 1322 1323
	set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
	return 1;
}

1324
static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1325 1326 1327
{
	set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
	clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1328
	set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1329 1330 1331 1332
	set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
	return 1;
}

1333
int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1334 1335 1336
{
	struct nfs_client *clp = server->nfs_client;

1337 1338
	if (!nfs4_valid_open_stateid(state))
		return -EBADF;
1339
	nfs4_state_mark_reclaim_nograce(clp, state);
1340 1341
	dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
			clp->cl_hostname);
1342
	nfs4_schedule_state_manager(clp);
1343
	return 0;
1344
}
A
Andy Adamson 已提交
1345
EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1346

1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
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;
1363
		if (!nfs4_stateid_match(&state->stateid, stateid))
1364 1365 1366 1367 1368 1369 1370 1371 1372
			continue;
		nfs4_state_mark_reclaim_nograce(clp, state);
		found = true;
	}
	spin_unlock(&inode->i_lock);
	if (found)
		nfs4_schedule_state_manager(clp);
}

1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
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);
}

1388 1389 1390
static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
{
	set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1391
	nfs4_state_mark_open_context_bad(state);
1392 1393
}

1394

1395
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1396 1397
{
	struct inode *inode = state->inode;
1398
	struct nfs_inode *nfsi = NFS_I(inode);
L
Linus Torvalds 已提交
1399 1400 1401
	struct file_lock *fl;
	int status = 0;

1402 1403 1404 1405
	if (inode->i_flock == NULL)
		return 0;

	/* Guard against delegation returns and new lock/unlock calls */
1406
	down_write(&nfsi->rwsem);
1407
	/* Protect inode->i_flock using the BKL */
1408
	spin_lock(&inode->i_lock);
H
Harvey Harrison 已提交
1409
	for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1410
		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
L
Linus Torvalds 已提交
1411
			continue;
1412
		if (nfs_file_open_context(fl->fl_file)->state != state)
L
Linus Torvalds 已提交
1413
			continue;
1414
		spin_unlock(&inode->i_lock);
L
Linus Torvalds 已提交
1415 1416
		status = ops->recover_lock(state, fl);
		switch (status) {
1417 1418 1419 1420 1421 1422 1423 1424 1425
			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:
1426 1427 1428 1429
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1430
				goto out;
L
Linus Torvalds 已提交
1431
			default:
1432 1433
				printk(KERN_ERR "NFS: %s: unhandled error %d\n",
					 __func__, status);
1434 1435
			case -ENOMEM:
			case -NFS4ERR_DENIED:
L
Linus Torvalds 已提交
1436 1437
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1438
				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
1439
				status = 0;
L
Linus Torvalds 已提交
1440
		}
1441
		spin_lock(&inode->i_lock);
L
Linus Torvalds 已提交
1442
	}
1443
	spin_unlock(&inode->i_lock);
1444
out:
1445
	up_write(&nfsi->rwsem);
L
Linus Torvalds 已提交
1446 1447 1448
	return status;
}

1449
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
{
	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.
	 */
1463
	spin_lock(&sp->so_lock);
1464 1465
	write_seqcount_begin(&sp->so_reclaim_seqcount);
restart:
L
Linus Torvalds 已提交
1466
	list_for_each_entry(state, &sp->so_states, open_states) {
1467 1468
		if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
			continue;
1469 1470
		if (!nfs4_valid_open_stateid(state))
			continue;
L
Linus Torvalds 已提交
1471 1472
		if (state->state == 0)
			continue;
1473 1474
		atomic_inc(&state->count);
		spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1475 1476
		status = ops->recover_open(sp, state);
		if (status >= 0) {
1477 1478
			status = nfs4_reclaim_locks(state, ops);
			if (status >= 0) {
1479 1480 1481 1482 1483 1484 1485 1486 1487
				if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) {
					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);
1488
				}
1489
				nfs4_put_open_state(state);
1490
				spin_lock(&sp->so_lock);
1491
				goto restart;
L
Linus Torvalds 已提交
1492 1493 1494 1495
			}
		}
		switch (status) {
			default:
1496 1497
				printk(KERN_ERR "NFS: %s: unhandled error %d\n",
					__func__, status);
L
Linus Torvalds 已提交
1498
			case -ENOENT:
1499
			case -ENOMEM:
1500
			case -ESTALE:
1501
				/* Open state on this file cannot be recovered */
1502
				nfs4_state_mark_recovery_failed(state, status);
L
Linus Torvalds 已提交
1503
				break;
1504 1505
			case -EAGAIN:
				ssleep(1);
1506 1507 1508
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_BAD_STATEID:
1509 1510
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1511
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1512
				break;
L
Linus Torvalds 已提交
1513 1514
			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
1515
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
L
Linus Torvalds 已提交
1516
			case -NFS4ERR_STALE_CLIENTID:
1517 1518 1519 1520
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
L
Linus Torvalds 已提交
1521 1522
				goto out_err;
		}
1523
		nfs4_put_open_state(state);
1524
		spin_lock(&sp->so_lock);
1525
		goto restart;
L
Linus Torvalds 已提交
1526
	}
1527
	write_seqcount_end(&sp->so_reclaim_seqcount);
1528
	spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1529 1530
	return 0;
out_err:
1531
	nfs4_put_open_state(state);
1532 1533 1534
	spin_lock(&sp->so_lock);
	write_seqcount_end(&sp->so_reclaim_seqcount);
	spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1535 1536 1537
	return status;
}

1538 1539 1540 1541 1542 1543 1544 1545
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);
1546
	spin_lock(&state->state_lock);
1547 1548
	list_for_each_entry(lock, &state->lock_states, ls_locks) {
		lock->ls_seqid.flags = 0;
1549
		clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1550
	}
1551
	spin_unlock(&state->state_lock);
1552 1553
}

1554 1555
static void nfs4_reset_seqids(struct nfs_server *server,
	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1556
{
1557
	struct nfs_client *clp = server->nfs_client;
1558
	struct nfs4_state_owner *sp;
1559
	struct rb_node *pos;
1560 1561
	struct nfs4_state *state;

1562 1563 1564 1565 1566
	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);
1567
		sp->so_seqid.flags = 0;
1568
		spin_lock(&sp->so_lock);
1569
		list_for_each_entry(state, &sp->so_states, open_states) {
1570 1571
			if (mark_reclaim(clp, state))
				nfs4_clear_open_state(state);
1572
		}
1573
		spin_unlock(&sp->so_lock);
1574
	}
1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
	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();
1587 1588
}

1589 1590 1591 1592 1593 1594 1595
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);
}

1596
static void nfs4_reclaim_complete(struct nfs_client *clp,
1597 1598
				 const struct nfs4_state_recovery_ops *ops,
				 struct rpc_cred *cred)
1599 1600 1601
{
	/* Notify the server we're done reclaiming our state */
	if (ops->reclaim_complete)
1602
		(void)ops->reclaim_complete(clp, cred);
1603 1604
}

1605
static void nfs4_clear_reclaim_server(struct nfs_server *server)
1606
{
1607
	struct nfs_client *clp = server->nfs_client;
1608 1609 1610 1611
	struct nfs4_state_owner *sp;
	struct rb_node *pos;
	struct nfs4_state *state;

1612 1613 1614 1615 1616
	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);
1617 1618
		spin_lock(&sp->so_lock);
		list_for_each_entry(state, &sp->so_states, open_states) {
1619 1620
			if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
						&state->flags))
1621 1622 1623 1624 1625
				continue;
			nfs4_state_mark_reclaim_nograce(clp, state);
		}
		spin_unlock(&sp->so_lock);
	}
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
	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();
1640 1641

	nfs_delegation_reap_unclaimed(clp);
1642 1643 1644 1645 1646
	return 1;
}

static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
{
1647 1648 1649
	const struct nfs4_state_recovery_ops *ops;
	struct rpc_cred *cred;

1650 1651
	if (!nfs4_state_clear_reclaim_reboot(clp))
		return;
1652
	ops = clp->cl_mvops->reboot_recovery_ops;
1653
	cred = nfs4_get_clid_cred(clp);
1654 1655
	nfs4_reclaim_complete(clp, ops, cred);
	put_rpccred(cred);
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
}

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);
}

1670
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1671 1672
{
	switch (error) {
1673 1674
		case 0:
			break;
1675
		case -NFS4ERR_CB_PATH_DOWN:
1676
			nfs40_handle_cb_pathdown(clp);
1677
			break;
1678 1679
		case -NFS4ERR_NO_GRACE:
			nfs4_state_end_reclaim_reboot(clp);
1680
			break;
1681 1682
		case -NFS4ERR_STALE_CLIENTID:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1683
			nfs4_state_clear_reclaim_reboot(clp);
1684 1685 1686 1687 1688
			nfs4_state_start_reclaim_reboot(clp);
			break;
		case -NFS4ERR_EXPIRED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
			nfs4_state_start_reclaim_nograce(clp);
1689
			break;
1690 1691 1692 1693 1694 1695
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
1696
			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1697
			/* Zero session reset errors */
1698
			break;
1699 1700 1701
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
			set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
			break;
1702
		default:
1703 1704
			dprintk("%s: failed to handle error %d for server %s\n",
					__func__, error, clp->cl_hostname);
1705
			return error;
1706
	}
1707 1708
	dprintk("%s: handled error %d for server %s\n", __func__, error,
			clp->cl_hostname);
1709
	return 0;
1710 1711
}

1712
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1713
{
1714 1715
	struct nfs4_state_owner *sp;
	struct nfs_server *server;
1716
	struct rb_node *pos;
L
Linus Torvalds 已提交
1717 1718
	int status = 0;

1719
restart:
1720 1721
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1722
		nfs4_purge_state_owners(server);
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742
		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);
			}

1743
			nfs4_put_state_owner(sp);
1744
			goto restart;
1745
		}
1746
		spin_unlock(&clp->cl_lock);
1747
	}
1748
	rcu_read_unlock();
1749 1750 1751 1752 1753 1754
	return status;
}

static int nfs4_check_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
1755 1756
	const struct nfs4_state_maintenance_ops *ops =
		clp->cl_mvops->state_renewal_ops;
1757
	int status;
L
Linus Torvalds 已提交
1758

1759 1760 1761
	/* Is the client already known to have an expired lease? */
	if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		return 0;
1762 1763 1764
	spin_lock(&clp->cl_lock);
	cred = ops->get_state_renewal_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
1765
	if (cred == NULL) {
1766
		cred = nfs4_get_clid_cred(clp);
1767
		status = -ENOKEY;
1768 1769
		if (cred == NULL)
			goto out;
1770
	}
1771
	status = ops->renew_lease(clp, cred);
1772
	put_rpccred(cred);
1773 1774 1775 1776
	if (status == -ETIMEDOUT) {
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
		return 0;
	}
1777
out:
1778
	return nfs4_recovery_handle_error(clp, status);
1779 1780
}

1781 1782
/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
 * and for recoverable errors on EXCHANGE_ID for v4.1
1783 1784 1785 1786
 */
static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
{
	switch (status) {
1787 1788 1789 1790 1791
	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);
1792 1793
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
		break;
1794 1795
	case -NFS4ERR_STALE_CLIENTID:
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1796 1797
		nfs4_state_clear_reclaim_reboot(clp);
		nfs4_state_start_reclaim_reboot(clp);
1798
		break;
1799 1800 1801 1802 1803 1804
	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;
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
	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);
1815 1816
		dprintk("%s: exit with error %d for server %s\n",
				__func__, -EPROTONOSUPPORT, clp->cl_hostname);
1817 1818 1819 1820
		return -EPROTONOSUPPORT;
	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
				 * in nfs4_exchange_id */
	default:
1821 1822
		dprintk("%s: exit with error %d for server %s\n", __func__,
				status, clp->cl_hostname);
1823 1824 1825
		return status;
	}
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1826 1827
	dprintk("%s: handled error %d for server %s\n", __func__, status,
			clp->cl_hostname);
1828 1829 1830
	return 0;
}

1831
static int nfs4_establish_lease(struct nfs_client *clp)
1832 1833
{
	struct rpc_cred *cred;
1834 1835
	const struct nfs4_state_recovery_ops *ops =
		clp->cl_mvops->reboot_recovery_ops;
1836
	int status;
1837

1838
	cred = nfs4_get_clid_cred(clp);
1839 1840 1841 1842 1843
	if (cred == NULL)
		return -ENOENT;
	status = ops->establish_clid(clp, cred);
	put_rpccred(cred);
	if (status != 0)
1844 1845 1846 1847 1848
		return status;
	pnfs_destroy_all_layouts(clp);
	return 0;
}

1849 1850 1851 1852
/*
 * Returns zero or a negative errno.  NFS4ERR values are converted
 * to local errno values.
 */
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
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)
1875
		return nfs4_handle_reclaim_lease_error(clp, status);
1876 1877 1878
	clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
	nfs4_state_start_reclaim_nograce(clp);
1879
	return 0;
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 1990 1991 1992 1993 1994
/*
 * 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;
}

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 2039 2040 2041 2042 2043
/*
 * 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;
}

2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
/**
 * 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;
2064
	int i, status;
2065 2066 2067 2068 2069 2070 2071 2072

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

	clnt = clp->cl_rpcclient;
	i = 0;

	mutex_lock(&nfs_clid_init_mutex);
again:
2073
	status  = -ENOENT;
2074
	cred = nfs4_get_clid_cred(clp);
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086
	if (cred == NULL)
		goto out_unlock;

	status = ops->detect_trunking(clp, result, cred);
	put_rpccred(cred);
	switch (status) {
	case 0:
		break;
	case -NFS4ERR_DELAY:
	case -ETIMEDOUT:
	case -EAGAIN:
		ssleep(1);
2087
	case -NFS4ERR_STALE_CLIENTID:
2088 2089 2090
		dprintk("NFS: %s after status %d, retrying\n",
			__func__, status);
		goto again;
2091
	case -EACCES:
2092 2093 2094 2095 2096
		if (i++ == 0) {
			nfs4_root_machine_cred(clp);
			goto again;
		}
		if (i > 2)
2097
			break;
2098 2099
	case -NFS4ERR_CLID_INUSE:
	case -NFS4ERR_WRONGSEC:
2100
		clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2101 2102 2103 2104
		if (IS_ERR(clnt)) {
			status = PTR_ERR(clnt);
			break;
		}
2105 2106 2107 2108 2109 2110 2111
		/* 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;
2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
		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;
2122 2123 2124 2125 2126
		break;
	default:
		pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
				__func__, status);
		status = -EIO;
2127 2128 2129 2130 2131 2132 2133 2134
	}

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

2135
#ifdef CONFIG_NFS_V4_1
2136
void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2137
{
2138 2139
	struct nfs_client *clp = session->clp;

2140 2141 2142 2143 2144 2145 2146
	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);
	}
2147
	nfs4_schedule_lease_recovery(clp);
2148
}
2149
EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2150

2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
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);
}

2163 2164 2165 2166 2167
void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
{
	nfs41_ping_server(clp);
}

2168 2169 2170
static void nfs4_reset_all_state(struct nfs_client *clp)
{
	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2171
		set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2172
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2173
		nfs4_state_start_reclaim_nograce(clp);
2174 2175
		dprintk("%s: scheduling reset of all state for server %s!\n",
				__func__, clp->cl_hostname);
2176
		nfs4_schedule_state_manager(clp);
2177 2178 2179 2180 2181 2182 2183
	}
}

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);
2184 2185
		dprintk("%s: server %s rebooted!\n", __func__,
				clp->cl_hostname);
2186
		nfs4_schedule_state_manager(clp);
2187 2188 2189 2190 2191 2192
	}
}

static void nfs41_handle_state_revoked(struct nfs_client *clp)
{
	nfs4_reset_all_state(clp);
2193
	dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2194 2195 2196 2197 2198 2199
}

static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
{
	/* This will need to handle layouts too */
	nfs_expire_all_delegations(clp);
2200 2201
	dprintk("%s: Recallable state revoked on server %s!\n", __func__,
			clp->cl_hostname);
2202 2203
}

2204
static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2205 2206 2207
{
	nfs_expire_all_delegations(clp);
	if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
2208
		nfs4_schedule_state_manager(clp);
2209 2210
	dprintk("%s: server %s declared a backchannel fault\n", __func__,
			clp->cl_hostname);
2211 2212
}

2213 2214 2215 2216 2217 2218 2219
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);
}

2220 2221 2222 2223
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
{
	if (!flags)
		return;
2224 2225 2226 2227

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

2228
	if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2229
		nfs41_handle_server_reboot(clp);
2230
	if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2231
			    SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
C
Chuck Lever 已提交
2232
			    SEQ4_STATUS_ADMIN_STATE_REVOKED))
2233
		nfs41_handle_state_revoked(clp);
C
Chuck Lever 已提交
2234 2235
	if (flags & SEQ4_STATUS_LEASE_MOVED)
		nfs4_schedule_lease_moved_recovery(clp);
2236
	if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2237
		nfs41_handle_recallable_state_revoked(clp);
2238 2239 2240 2241
	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))
2242
		nfs41_handle_cb_path_down(clp);
2243 2244
}

2245 2246
static int nfs4_reset_session(struct nfs_client *clp)
{
2247
	struct rpc_cred *cred;
2248 2249
	int status;

2250 2251
	if (!nfs4_has_session(clp))
		return 0;
2252
	nfs4_begin_drain_session(clp);
2253
	cred = nfs4_get_clid_cred(clp);
2254
	status = nfs4_proc_destroy_session(clp->cl_session, cred);
2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266
	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:
2267
		status = nfs4_recovery_handle_error(clp, status);
2268 2269 2270 2271
		goto out;
	}

	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2272
	status = nfs4_proc_create_session(clp, cred);
2273
	if (status) {
2274 2275
		dprintk("%s: session reset failed with status %d for server %s!\n",
			__func__, status, clp->cl_hostname);
2276
		status = nfs4_handle_reclaim_lease_error(clp, status);
2277 2278
		goto out;
	}
2279
	nfs41_finish_session_reset(clp);
2280 2281
	dprintk("%s: session reset was successful for server %s!\n",
			__func__, clp->cl_hostname);
2282
out:
2283 2284
	if (cred)
		put_rpccred(cred);
2285 2286
	return status;
}
2287

2288 2289
static int nfs4_bind_conn_to_session(struct nfs_client *clp)
{
2290 2291 2292
	struct rpc_cred *cred;
	int ret;

2293 2294
	if (!nfs4_has_session(clp))
		return 0;
2295
	nfs4_begin_drain_session(clp);
2296
	cred = nfs4_get_clid_cred(clp);
2297 2298 2299
	ret = nfs4_proc_bind_conn_to_session(clp, cred);
	if (cred)
		put_rpccred(cred);
2300
	clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2301 2302
	switch (ret) {
	case 0:
2303 2304
		dprintk("%s: bind_conn_to_session was successful for server %s!\n",
			__func__, clp->cl_hostname);
2305 2306 2307 2308 2309 2310 2311 2312 2313
		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;
2314
}
2315
#else /* CONFIG_NFS_V4_1 */
2316
static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2317 2318 2319 2320 2321

static int nfs4_bind_conn_to_session(struct nfs_client *clp)
{
	return 0;
}
2322 2323
#endif /* CONFIG_NFS_V4_1 */

2324
static void nfs4_state_manager(struct nfs_client *clp)
2325 2326
{
	int status = 0;
2327
	const char *section = "", *section_sep = "";
2328 2329

	/* Ensure exclusive access to NFSv4 state */
2330
	do {
2331
		if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2332
			section = "purge state";
2333
			status = nfs4_purge_lease(clp);
2334 2335
			if (status < 0)
				goto out_error;
2336
			continue;
2337 2338
		}

2339
		if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2340
			section = "lease expired";
2341 2342
			/* We're going to have to re-establish a clientid */
			status = nfs4_reclaim_lease(clp);
2343
			if (status < 0)
2344
				goto out_error;
2345
			continue;
2346 2347
		}

2348
		/* Initialize or reset the session */
2349
		if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2350
			section = "reset session";
2351
			status = nfs4_reset_session(clp);
2352 2353 2354
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
				continue;
			if (status < 0)
2355 2356
				goto out_error;
		}
2357

2358 2359
		/* Send BIND_CONN_TO_SESSION */
		if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2360
				&clp->cl_state)) {
2361
			section = "bind conn to session";
2362 2363 2364
			status = nfs4_bind_conn_to_session(clp);
			if (status < 0)
				goto out_error;
2365
			continue;
2366 2367
		}

2368 2369 2370 2371 2372
		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;
2373 2374 2375 2376 2377 2378 2379
		}

		if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
			section = "migration";
			status = nfs4_handle_migration(clp);
			if (status < 0)
				goto out_error;
2380 2381
		}

2382 2383 2384 2385 2386 2387 2388
		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;
		}

2389
		/* First recover reboot state... */
2390
		if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2391
			section = "reclaim reboot";
2392
			status = nfs4_do_reclaim(clp,
2393
				clp->cl_mvops->reboot_recovery_ops);
2394
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2395
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2396
				continue;
2397
			nfs4_state_end_reclaim_reboot(clp);
2398 2399 2400 2401
			if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
				continue;
			if (status < 0)
				goto out_error;
2402 2403
		}

2404 2405
		/* Now recover expired state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2406
			section = "reclaim nograce";
2407
			status = nfs4_do_reclaim(clp,
2408
				clp->cl_mvops->nograce_recovery_ops);
2409
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2410
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2411 2412 2413
			    test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
				continue;
			if (status < 0)
2414
				goto out_error;
L
Linus Torvalds 已提交
2415
		}
2416

2417
		nfs4_end_drain_session(clp);
2418 2419 2420 2421
		if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
			nfs_client_return_marked_delegations(clp);
			continue;
		}
2422 2423

		nfs4_clear_state_manager_bit(clp);
2424 2425 2426 2427 2428
		/* 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;
2429
	} while (atomic_read(&clp->cl_count) > 1);
2430
	return;
L
Linus Torvalds 已提交
2431
out_error:
2432 2433 2434 2435 2436
	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);
2437
	ssleep(1);
2438
	nfs4_end_drain_session(clp);
2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
	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
2451 2452 2453 2454 2455 2456 2457
}

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