1/*
   2 *  fs/nfs/nfs4state.c
   3 *
   4 *  Client-side XDR for NFSv4.
   5 *
   6 *  Copyright (c) 2002 The Regents of the University of Michigan.
   7 *  All rights reserved.
   8 *
   9 *  Kendrick Smith <kmsmith@umich.edu>
  10 *
  11 *  Redistribution and use in source and binary forms, with or without
  12 *  modification, are permitted provided that the following conditions
  13 *  are met:
  14 *
  15 *  1. Redistributions of source code must retain the above copyright
  16 *     notice, this list of conditions and the following disclaimer.
  17 *  2. Redistributions in binary form must reproduce the above copyright
  18 *     notice, this list of conditions and the following disclaimer in the
  19 *     documentation and/or other materials provided with the distribution.
  20 *  3. Neither the name of the University nor the names of its
  21 *     contributors may be used to endorse or promote products derived
  22 *     from this software without specific prior written permission.
  23 *
  24 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  25 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  31 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35 *
  36 * Implementation of the NFSv4 state model.  For the time being,
  37 * this is minimal, but will be made much more complex in a
  38 * subsequent patch.
  39 */
  40
  41#include <linux/kernel.h>
  42#include <linux/slab.h>
  43#include <linux/fs.h>
  44#include <linux/nfs_fs.h>
  45#include <linux/nfs_idmap.h>
  46#include <linux/kthread.h>
  47#include <linux/module.h>
  48#include <linux/random.h>
  49#include <linux/ratelimit.h>
  50#include <linux/workqueue.h>
  51#include <linux/bitops.h>
 
 
 
  52
  53#include "nfs4_fs.h"
  54#include "callback.h"
  55#include "delegation.h"
  56#include "internal.h"
 
 
  57#include "pnfs.h"
 
  58
  59#define OPENOWNER_POOL_SIZE	8
  60
  61const nfs4_stateid zero_stateid;
  62
  63static LIST_HEAD(nfs4_clientid_list);
 
 
 
 
  64
  65int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
  66{
  67	struct nfs4_setclientid_res clid = {
  68		.clientid = clp->cl_clientid,
  69		.confirm = clp->cl_confirm,
  70	};
  71	unsigned short port;
  72	int status;
 
  73
  74	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
  75		goto do_confirm;
  76	port = nfs_callback_tcpport;
  77	if (clp->cl_addr.ss_family == AF_INET6)
  78		port = nfs_callback_tcpport6;
  79
  80	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
  81	if (status != 0)
  82		goto out;
  83	clp->cl_clientid = clid.clientid;
  84	clp->cl_confirm = clid.confirm;
  85	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  86do_confirm:
  87	status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
  88	if (status != 0)
  89		goto out;
  90	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  91	nfs4_schedule_state_renewal(clp);
  92out:
  93	return status;
  94}
  95
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  96struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
  97{
  98	struct rpc_cred *cred = NULL;
  99
 100	if (clp->cl_machine_cred != NULL)
 101		cred = get_rpccred(clp->cl_machine_cred);
 102	return cred;
 103}
 104
 105static void nfs4_clear_machine_cred(struct nfs_client *clp)
 106{
 107	struct rpc_cred *cred;
 108
 
 109	spin_lock(&clp->cl_lock);
 110	cred = clp->cl_machine_cred;
 111	clp->cl_machine_cred = NULL;
 112	spin_unlock(&clp->cl_lock);
 113	if (cred != NULL)
 114		put_rpccred(cred);
 115}
 116
 117static struct rpc_cred *
 118nfs4_get_renew_cred_server_locked(struct nfs_server *server)
 119{
 120	struct rpc_cred *cred = NULL;
 121	struct nfs4_state_owner *sp;
 122	struct rb_node *pos;
 123
 124	for (pos = rb_first(&server->state_owners);
 125	     pos != NULL;
 126	     pos = rb_next(pos)) {
 127		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 128		if (list_empty(&sp->so_states))
 129			continue;
 130		cred = get_rpccred(sp->so_cred);
 131		break;
 132	}
 133	return cred;
 134}
 135
 136/**
 137 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
 138 * @clp: client state handle
 139 *
 140 * Returns an rpc_cred with reference count bumped, or NULL.
 141 * Caller must hold clp->cl_lock.
 142 */
 143struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 144{
 145	struct rpc_cred *cred = NULL;
 146	struct nfs_server *server;
 147
 
 
 
 
 
 148	rcu_read_lock();
 149	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 150		cred = nfs4_get_renew_cred_server_locked(server);
 151		if (cred != NULL)
 152			break;
 153	}
 154	rcu_read_unlock();
 
 
 155	return cred;
 156}
 157
 158#if defined(CONFIG_NFS_V4_1)
 159
 160static int nfs41_setup_state_renewal(struct nfs_client *clp)
 161{
 162	int status;
 163	struct nfs_fsinfo fsinfo;
 164
 165	if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
 166		nfs4_schedule_state_renewal(clp);
 167		return 0;
 168	}
 169
 170	status = nfs4_proc_get_lease_time(clp, &fsinfo);
 171	if (status == 0) {
 172		/* Update lease time and schedule renewal */
 173		spin_lock(&clp->cl_lock);
 174		clp->cl_lease_time = fsinfo.lease_time * HZ;
 175		clp->cl_last_renewal = jiffies;
 176		spin_unlock(&clp->cl_lock);
 177
 178		nfs4_schedule_state_renewal(clp);
 179	}
 180
 181	return status;
 182}
 183
 184/*
 185 * Back channel returns NFS4ERR_DELAY for new requests when
 186 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
 187 * is ended.
 188 */
 189static void nfs4_end_drain_session(struct nfs_client *clp)
 190{
 191	struct nfs4_session *ses = clp->cl_session;
 192	int max_slots;
 193
 194	if (ses == NULL)
 
 195		return;
 196	if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 197		spin_lock(&ses->fc_slot_table.slot_tbl_lock);
 198		max_slots = ses->fc_slot_table.max_slots;
 199		while (max_slots--) {
 200			struct rpc_task *task;
 201
 202			task = rpc_wake_up_next(&ses->fc_slot_table.
 203						slot_tbl_waitq);
 204			if (!task)
 205				break;
 206			rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 207		}
 208		spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
 209	}
 210}
 211
 212static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
 213{
 
 214	spin_lock(&tbl->slot_tbl_lock);
 215	if (tbl->highest_used_slotid != -1) {
 216		INIT_COMPLETION(tbl->complete);
 217		spin_unlock(&tbl->slot_tbl_lock);
 218		return wait_for_completion_interruptible(&tbl->complete);
 219	}
 220	spin_unlock(&tbl->slot_tbl_lock);
 221	return 0;
 222}
 223
 224static int nfs4_begin_drain_session(struct nfs_client *clp)
 225{
 226	struct nfs4_session *ses = clp->cl_session;
 227	int ret = 0;
 228
 229	set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
 
 
 230	/* back channel */
 231	ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
 232	if (ret)
 233		return ret;
 234	/* fore channel */
 235	return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 236}
 237
 238int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 239{
 240	int status;
 241
 242	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
 243		goto do_confirm;
 244	nfs4_begin_drain_session(clp);
 245	status = nfs4_proc_exchange_id(clp, cred);
 246	if (status != 0)
 247		goto out;
 248	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 249do_confirm:
 250	status = nfs4_proc_create_session(clp);
 251	if (status != 0)
 252		goto out;
 253	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 254	nfs41_setup_state_renewal(clp);
 255	nfs_mark_client_ready(clp, NFS_CS_READY);
 256out:
 257	return status;
 258}
 259
 260struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 261{
 262	struct rpc_cred *cred;
 263
 264	spin_lock(&clp->cl_lock);
 265	cred = nfs4_get_machine_cred_locked(clp);
 266	spin_unlock(&clp->cl_lock);
 267	return cred;
 268}
 269
 270#endif /* CONFIG_NFS_V4_1 */
 
 
 271
 272static struct rpc_cred *
 273nfs4_get_setclientid_cred_server(struct nfs_server *server)
 274{
 275	struct nfs_client *clp = server->nfs_client;
 276	struct rpc_cred *cred = NULL;
 277	struct nfs4_state_owner *sp;
 278	struct rb_node *pos;
 279
 280	spin_lock(&clp->cl_lock);
 281	pos = rb_first(&server->state_owners);
 282	if (pos != NULL) {
 283		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 284		cred = get_rpccred(sp->so_cred);
 285	}
 286	spin_unlock(&clp->cl_lock);
 287	return cred;
 
 
 288}
 289
 
 
 290/**
 291 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
 292 * @clp: client state handle
 293 *
 294 * Returns an rpc_cred with reference count bumped, or NULL.
 295 */
 296struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 297{
 298	struct nfs_server *server;
 299	struct rpc_cred *cred;
 300
 301	spin_lock(&clp->cl_lock);
 302	cred = nfs4_get_machine_cred_locked(clp);
 303	spin_unlock(&clp->cl_lock);
 304	if (cred != NULL)
 305		goto out;
 306
 307	rcu_read_lock();
 308	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 309		cred = nfs4_get_setclientid_cred_server(server);
 310		if (cred != NULL)
 311			break;
 312	}
 313	rcu_read_unlock();
 314
 315out:
 316	return cred;
 317}
 318
 319static void nfs_alloc_unique_id_locked(struct rb_root *root,
 320				       struct nfs_unique_id *new,
 321				       __u64 minval, int maxbits)
 322{
 323	struct rb_node **p, *parent;
 324	struct nfs_unique_id *pos;
 325	__u64 mask = ~0ULL;
 326
 327	if (maxbits < 64)
 328		mask = (1ULL << maxbits) - 1ULL;
 329
 330	/* Ensure distribution is more or less flat */
 331	get_random_bytes(&new->id, sizeof(new->id));
 332	new->id &= mask;
 333	if (new->id < minval)
 334		new->id += minval;
 335retry:
 336	p = &root->rb_node;
 337	parent = NULL;
 338
 339	while (*p != NULL) {
 340		parent = *p;
 341		pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 342
 343		if (new->id < pos->id)
 344			p = &(*p)->rb_left;
 345		else if (new->id > pos->id)
 346			p = &(*p)->rb_right;
 347		else
 348			goto id_exists;
 349	}
 350	rb_link_node(&new->rb_node, parent, p);
 351	rb_insert_color(&new->rb_node, root);
 352	return;
 353id_exists:
 354	for (;;) {
 355		new->id++;
 356		if (new->id < minval || (new->id & mask) != new->id) {
 357			new->id = minval;
 358			break;
 359		}
 360		parent = rb_next(parent);
 361		if (parent == NULL)
 362			break;
 363		pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 364		if (new->id < pos->id)
 365			break;
 366	}
 367	goto retry;
 368}
 369
 370static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
 371{
 372	rb_erase(&id->rb_node, root);
 373}
 374
 375static struct nfs4_state_owner *
 376nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
 377{
 378	struct rb_node **p = &server->state_owners.rb_node,
 379		       *parent = NULL;
 380	struct nfs4_state_owner *sp, *res = NULL;
 381
 382	while (*p != NULL) {
 383		parent = *p;
 384		sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 385
 386		if (server < sp->so_server) {
 387			p = &parent->rb_left;
 388			continue;
 389		}
 390		if (server > sp->so_server) {
 391			p = &parent->rb_right;
 392			continue;
 393		}
 394		if (cred < sp->so_cred)
 395			p = &parent->rb_left;
 396		else if (cred > sp->so_cred)
 397			p = &parent->rb_right;
 398		else {
 
 
 399			atomic_inc(&sp->so_count);
 400			res = sp;
 401			break;
 402		}
 403	}
 404	return res;
 405}
 406
 407static struct nfs4_state_owner *
 408nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
 409{
 410	struct nfs_server *server = new->so_server;
 411	struct rb_node **p = &server->state_owners.rb_node,
 412		       *parent = NULL;
 413	struct nfs4_state_owner *sp;
 
 414
 415	while (*p != NULL) {
 416		parent = *p;
 417		sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 418
 419		if (new->so_cred < sp->so_cred)
 420			p = &parent->rb_left;
 421		else if (new->so_cred > sp->so_cred)
 422			p = &parent->rb_right;
 423		else {
 
 
 424			atomic_inc(&sp->so_count);
 425			return sp;
 426		}
 427	}
 428	nfs_alloc_unique_id_locked(&server->openowner_id,
 429					&new->so_owner_id, 1, 64);
 
 430	rb_link_node(&new->so_server_node, parent, p);
 431	rb_insert_color(&new->so_server_node, &server->state_owners);
 432	return new;
 433}
 434
 435static void
 436nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
 437{
 438	struct nfs_server *server = sp->so_server;
 439
 440	if (!RB_EMPTY_NODE(&sp->so_server_node))
 441		rb_erase(&sp->so_server_node, &server->state_owners);
 442	nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 443}
 444
 445/*
 446 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 447 * create a new state_owner.
 448 *
 449 */
 450static struct nfs4_state_owner *
 451nfs4_alloc_state_owner(void)
 
 
 452{
 453	struct nfs4_state_owner *sp;
 454
 455	sp = kzalloc(sizeof(*sp),GFP_NOFS);
 456	if (!sp)
 457		return NULL;
 
 
 458	spin_lock_init(&sp->so_lock);
 459	INIT_LIST_HEAD(&sp->so_states);
 460	rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
 461	sp->so_seqid.sequence = &sp->so_sequence;
 462	spin_lock_init(&sp->so_sequence.lock);
 463	INIT_LIST_HEAD(&sp->so_sequence.list);
 464	atomic_set(&sp->so_count, 1);
 
 
 
 465	return sp;
 466}
 467
 468static void
 469nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 470{
 471	if (!RB_EMPTY_NODE(&sp->so_server_node)) {
 472		struct nfs_server *server = sp->so_server;
 473		struct nfs_client *clp = server->nfs_client;
 
 
 
 
 
 
 
 
 474
 475		spin_lock(&clp->cl_lock);
 476		rb_erase(&sp->so_server_node, &server->state_owners);
 477		RB_CLEAR_NODE(&sp->so_server_node);
 478		spin_unlock(&clp->cl_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 479	}
 480}
 481
 482/**
 483 * nfs4_get_state_owner - Look up a state owner given a credential
 484 * @server: nfs_server to search
 485 * @cred: RPC credential to match
 486 *
 487 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
 488 */
 489struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
 490					      struct rpc_cred *cred)
 
 491{
 492	struct nfs_client *clp = server->nfs_client;
 493	struct nfs4_state_owner *sp, *new;
 494
 495	spin_lock(&clp->cl_lock);
 496	sp = nfs4_find_state_owner_locked(server, cred);
 497	spin_unlock(&clp->cl_lock);
 498	if (sp != NULL)
 499		return sp;
 500	new = nfs4_alloc_state_owner();
 501	if (new == NULL)
 502		return NULL;
 503	new->so_server = server;
 504	new->so_cred = cred;
 505	spin_lock(&clp->cl_lock);
 506	sp = nfs4_insert_state_owner_locked(new);
 507	spin_unlock(&clp->cl_lock);
 508	if (sp == new)
 509		get_rpccred(cred);
 510	else {
 511		rpc_destroy_wait_queue(&new->so_sequence.wait);
 512		kfree(new);
 513	}
 514	return sp;
 515}
 516
 517/**
 518 * nfs4_put_state_owner - Release a nfs4_state_owner
 519 * @sp: state owner data to release
 520 *
 
 
 
 
 
 
 
 521 */
 522void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 523{
 524	struct nfs_client *clp = sp->so_server->nfs_client;
 525	struct rpc_cred *cred = sp->so_cred;
 526
 527	if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 528		return;
 529	nfs4_remove_state_owner_locked(sp);
 
 
 530	spin_unlock(&clp->cl_lock);
 531	rpc_destroy_wait_queue(&sp->so_sequence.wait);
 532	put_rpccred(cred);
 533	kfree(sp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 534}
 535
 536static struct nfs4_state *
 537nfs4_alloc_open_state(void)
 538{
 539	struct nfs4_state *state;
 540
 541	state = kzalloc(sizeof(*state), GFP_NOFS);
 542	if (!state)
 543		return NULL;
 544	atomic_set(&state->count, 1);
 545	INIT_LIST_HEAD(&state->lock_states);
 546	spin_lock_init(&state->state_lock);
 547	seqlock_init(&state->seqlock);
 548	return state;
 549}
 550
 551void
 552nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 553{
 554	if (state->state == fmode)
 555		return;
 556	/* NB! List reordering - see the reclaim code for why.  */
 557	if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 558		if (fmode & FMODE_WRITE)
 559			list_move(&state->open_states, &state->owner->so_states);
 560		else
 561			list_move_tail(&state->open_states, &state->owner->so_states);
 562	}
 563	state->state = fmode;
 564}
 565
 566static struct nfs4_state *
 567__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 568{
 569	struct nfs_inode *nfsi = NFS_I(inode);
 570	struct nfs4_state *state;
 571
 572	list_for_each_entry(state, &nfsi->open_states, inode_states) {
 573		if (state->owner != owner)
 574			continue;
 
 
 575		if (atomic_inc_not_zero(&state->count))
 576			return state;
 577	}
 578	return NULL;
 579}
 580
 581static void
 582nfs4_free_open_state(struct nfs4_state *state)
 583{
 584	kfree(state);
 585}
 586
 587struct nfs4_state *
 588nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 589{
 590	struct nfs4_state *state, *new;
 591	struct nfs_inode *nfsi = NFS_I(inode);
 592
 593	spin_lock(&inode->i_lock);
 594	state = __nfs4_find_state_byowner(inode, owner);
 595	spin_unlock(&inode->i_lock);
 596	if (state)
 597		goto out;
 598	new = nfs4_alloc_open_state();
 599	spin_lock(&owner->so_lock);
 600	spin_lock(&inode->i_lock);
 601	state = __nfs4_find_state_byowner(inode, owner);
 602	if (state == NULL && new != NULL) {
 603		state = new;
 604		state->owner = owner;
 605		atomic_inc(&owner->so_count);
 606		list_add(&state->inode_states, &nfsi->open_states);
 607		ihold(inode);
 608		state->inode = inode;
 609		spin_unlock(&inode->i_lock);
 610		/* Note: The reclaim code dictates that we add stateless
 611		 * and read-only stateids to the end of the list */
 612		list_add_tail(&state->open_states, &owner->so_states);
 613		spin_unlock(&owner->so_lock);
 614	} else {
 615		spin_unlock(&inode->i_lock);
 616		spin_unlock(&owner->so_lock);
 617		if (new)
 618			nfs4_free_open_state(new);
 619	}
 620out:
 621	return state;
 622}
 623
 624void nfs4_put_open_state(struct nfs4_state *state)
 625{
 626	struct inode *inode = state->inode;
 627	struct nfs4_state_owner *owner = state->owner;
 628
 629	if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 630		return;
 631	spin_lock(&inode->i_lock);
 632	list_del(&state->inode_states);
 633	list_del(&state->open_states);
 634	spin_unlock(&inode->i_lock);
 635	spin_unlock(&owner->so_lock);
 636	iput(inode);
 637	nfs4_free_open_state(state);
 638	nfs4_put_state_owner(owner);
 639}
 640
 641/*
 642 * Close the current file.
 643 */
 644static void __nfs4_close(struct nfs4_state *state,
 645		fmode_t fmode, gfp_t gfp_mask, int wait)
 646{
 647	struct nfs4_state_owner *owner = state->owner;
 648	int call_close = 0;
 649	fmode_t newstate;
 650
 651	atomic_inc(&owner->so_count);
 652	/* Protect against nfs4_find_state() */
 653	spin_lock(&owner->so_lock);
 654	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 655		case FMODE_READ:
 656			state->n_rdonly--;
 657			break;
 658		case FMODE_WRITE:
 659			state->n_wronly--;
 660			break;
 661		case FMODE_READ|FMODE_WRITE:
 662			state->n_rdwr--;
 663	}
 664	newstate = FMODE_READ|FMODE_WRITE;
 665	if (state->n_rdwr == 0) {
 666		if (state->n_rdonly == 0) {
 667			newstate &= ~FMODE_READ;
 668			call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 669			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 670		}
 671		if (state->n_wronly == 0) {
 672			newstate &= ~FMODE_WRITE;
 673			call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 674			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 675		}
 676		if (newstate == 0)
 677			clear_bit(NFS_DELEGATED_STATE, &state->flags);
 678	}
 679	nfs4_state_set_mode_locked(state, newstate);
 680	spin_unlock(&owner->so_lock);
 681
 682	if (!call_close) {
 683		nfs4_put_open_state(state);
 684		nfs4_put_state_owner(owner);
 685	} else {
 686		bool roc = pnfs_roc(state->inode);
 687
 688		nfs4_do_close(state, gfp_mask, wait, roc);
 689	}
 690}
 691
 692void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
 693{
 694	__nfs4_close(state, fmode, GFP_NOFS, 0);
 695}
 696
 697void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
 698{
 699	__nfs4_close(state, fmode, GFP_KERNEL, 1);
 700}
 701
 702/*
 703 * Search the state->lock_states for an existing lock_owner
 704 * that is compatible with current->files
 
 
 
 
 
 
 
 
 
 705 */
 706static struct nfs4_lock_state *
 707__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 
 708{
 709	struct nfs4_lock_state *pos;
 710	list_for_each_entry(pos, &state->lock_states, ls_locks) {
 711		if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
 712			continue;
 713		switch (pos->ls_owner.lo_type) {
 714		case NFS4_POSIX_LOCK_TYPE:
 715			if (pos->ls_owner.lo_u.posix_owner != fl_owner)
 716				continue;
 717			break;
 718		case NFS4_FLOCK_LOCK_TYPE:
 719			if (pos->ls_owner.lo_u.flock_owner != fl_pid)
 720				continue;
 721		}
 722		atomic_inc(&pos->ls_count);
 723		return pos;
 724	}
 725	return NULL;
 
 
 726}
 727
 728/*
 729 * Return a compatible lock_state. If no initialized lock_state structure
 730 * exists, return an uninitialized one.
 731 *
 732 */
 733static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 734{
 735	struct nfs4_lock_state *lsp;
 736	struct nfs_server *server = state->owner->so_server;
 737	struct nfs_client *clp = server->nfs_client;
 738
 739	lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
 740	if (lsp == NULL)
 741		return NULL;
 742	rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
 743	spin_lock_init(&lsp->ls_sequence.lock);
 744	INIT_LIST_HEAD(&lsp->ls_sequence.list);
 745	lsp->ls_seqid.sequence = &lsp->ls_sequence;
 746	atomic_set(&lsp->ls_count, 1);
 747	lsp->ls_state = state;
 748	lsp->ls_owner.lo_type = type;
 749	switch (lsp->ls_owner.lo_type) {
 750	case NFS4_FLOCK_LOCK_TYPE:
 751		lsp->ls_owner.lo_u.flock_owner = fl_pid;
 752		break;
 753	case NFS4_POSIX_LOCK_TYPE:
 754		lsp->ls_owner.lo_u.posix_owner = fl_owner;
 755		break;
 756	default:
 757		kfree(lsp);
 758		return NULL;
 759	}
 760	spin_lock(&clp->cl_lock);
 761	nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
 762	spin_unlock(&clp->cl_lock);
 763	INIT_LIST_HEAD(&lsp->ls_locks);
 764	return lsp;
 
 
 
 765}
 766
 767static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
 768{
 769	struct nfs_server *server = lsp->ls_state->owner->so_server;
 770	struct nfs_client *clp = server->nfs_client;
 771
 772	spin_lock(&clp->cl_lock);
 773	nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
 774	spin_unlock(&clp->cl_lock);
 775	rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
 776	kfree(lsp);
 777}
 778
 779/*
 780 * Return a compatible lock_state. If no initialized lock_state structure
 781 * exists, return an uninitialized one.
 782 *
 783 */
 784static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
 785{
 786	struct nfs4_lock_state *lsp, *new = NULL;
 787	
 788	for(;;) {
 789		spin_lock(&state->state_lock);
 790		lsp = __nfs4_find_lock_state(state, owner, pid, type);
 791		if (lsp != NULL)
 792			break;
 793		if (new != NULL) {
 794			list_add(&new->ls_locks, &state->lock_states);
 795			set_bit(LK_STATE_IN_USE, &state->flags);
 796			lsp = new;
 797			new = NULL;
 798			break;
 799		}
 800		spin_unlock(&state->state_lock);
 801		new = nfs4_alloc_lock_state(state, owner, pid, type);
 802		if (new == NULL)
 803			return NULL;
 804	}
 805	spin_unlock(&state->state_lock);
 806	if (new != NULL)
 807		nfs4_free_lock_state(new);
 808	return lsp;
 809}
 810
 811/*
 812 * Release reference to lock_state, and free it if we see that
 813 * it is no longer in use
 814 */
 815void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 816{
 
 817	struct nfs4_state *state;
 818
 819	if (lsp == NULL)
 820		return;
 821	state = lsp->ls_state;
 822	if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 823		return;
 824	list_del(&lsp->ls_locks);
 825	if (list_empty(&state->lock_states))
 826		clear_bit(LK_STATE_IN_USE, &state->flags);
 827	spin_unlock(&state->state_lock);
 828	if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
 829		nfs4_release_lockowner(lsp);
 830	nfs4_free_lock_state(lsp);
 
 
 
 
 831}
 832
 833static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 834{
 835	struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 836
 837	dst->fl_u.nfs4_fl.owner = lsp;
 838	atomic_inc(&lsp->ls_count);
 839}
 840
 841static void nfs4_fl_release_lock(struct file_lock *fl)
 842{
 843	nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 844}
 845
 846static const struct file_lock_operations nfs4_fl_lock_ops = {
 847	.fl_copy_lock = nfs4_fl_copy_lock,
 848	.fl_release_private = nfs4_fl_release_lock,
 849};
 850
 851int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 852{
 853	struct nfs4_lock_state *lsp;
 854
 855	if (fl->fl_ops != NULL)
 856		return 0;
 857	if (fl->fl_flags & FL_POSIX)
 858		lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
 859	else if (fl->fl_flags & FL_FLOCK)
 860		lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
 861	else
 862		return -EINVAL;
 863	if (lsp == NULL)
 864		return -ENOMEM;
 865	fl->fl_u.nfs4_fl.owner = lsp;
 866	fl->fl_ops = &nfs4_fl_lock_ops;
 867	return 0;
 868}
 869
 870/*
 871 * Byte-range lock aware utility to initialize the stateid of read/write
 872 * requests.
 873 */
 874void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
 875{
 876	struct nfs4_lock_state *lsp;
 877	int seq;
 
 
 
 
 878
 879	do {
 880		seq = read_seqbegin(&state->seqlock);
 881		memcpy(dst, &state->stateid, sizeof(*dst));
 882	} while (read_seqretry(&state->seqlock, seq));
 883	if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 884		return;
 
 
 
 885
 886	spin_lock(&state->state_lock);
 887	lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
 888	if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
 889		memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
 
 
 
 
 890	spin_unlock(&state->state_lock);
 891	nfs4_put_lock_state(lsp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 892}
 893
 894struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
 895{
 896	struct nfs_seqid *new;
 897
 898	new = kmalloc(sizeof(*new), gfp_mask);
 899	if (new != NULL) {
 900		new->sequence = counter;
 901		INIT_LIST_HEAD(&new->list);
 902	}
 
 903	return new;
 904}
 905
 906void nfs_release_seqid(struct nfs_seqid *seqid)
 907{
 908	if (!list_empty(&seqid->list)) {
 909		struct rpc_sequence *sequence = seqid->sequence->sequence;
 910
 911		spin_lock(&sequence->lock);
 912		list_del_init(&seqid->list);
 913		spin_unlock(&sequence->lock);
 914		rpc_wake_up(&sequence->wait);
 
 
 
 
 
 
 
 915	}
 
 916}
 917
 918void nfs_free_seqid(struct nfs_seqid *seqid)
 919{
 920	nfs_release_seqid(seqid);
 921	kfree(seqid);
 922}
 923
 924/*
 925 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 926 * failed with a seqid incrementing error -
 927 * see comments nfs_fs.h:seqid_mutating_error()
 928 */
 929static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 930{
 931	BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
 932	switch (status) {
 933		case 0:
 934			break;
 935		case -NFS4ERR_BAD_SEQID:
 936			if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 937				return;
 938			printk(KERN_WARNING "NFS: v4 server returned a bad"
 939					" sequence-id error on an"
 940					" unconfirmed sequence %p!\n",
 941					seqid->sequence);
 942		case -NFS4ERR_STALE_CLIENTID:
 943		case -NFS4ERR_STALE_STATEID:
 944		case -NFS4ERR_BAD_STATEID:
 945		case -NFS4ERR_BADXDR:
 946		case -NFS4ERR_RESOURCE:
 947		case -NFS4ERR_NOFILEHANDLE:
 
 948			/* Non-seqid mutating errors */
 949			return;
 950	};
 951	/*
 952	 * Note: no locking needed as we are guaranteed to be first
 953	 * on the sequence list
 954	 */
 955	seqid->sequence->counter++;
 956}
 957
 958void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
 959{
 960	struct nfs4_state_owner *sp = container_of(seqid->sequence,
 961					struct nfs4_state_owner, so_seqid);
 962	struct nfs_server *server = sp->so_server;
 963
 
 
 
 
 964	if (status == -NFS4ERR_BAD_SEQID)
 965		nfs4_drop_state_owner(sp);
 966	if (!nfs4_has_session(server->nfs_client))
 967		nfs_increment_seqid(status, seqid);
 968}
 969
 970/*
 971 * Increment the seqid if the LOCK/LOCKU succeeded, or
 972 * failed with a seqid incrementing error -
 973 * see comments nfs_fs.h:seqid_mutating_error()
 974 */
 975void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
 976{
 977	nfs_increment_seqid(status, seqid);
 
 978}
 979
 980int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
 981{
 982	struct rpc_sequence *sequence = seqid->sequence->sequence;
 983	int status = 0;
 984
 
 
 
 985	spin_lock(&sequence->lock);
 
 986	if (list_empty(&seqid->list))
 987		list_add_tail(&seqid->list, &sequence->list);
 988	if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
 989		goto unlock;
 990	rpc_sleep_on(&sequence->wait, task, NULL);
 991	status = -EAGAIN;
 992unlock:
 993	spin_unlock(&sequence->lock);
 
 994	return status;
 995}
 996
 997static int nfs4_run_state_manager(void *);
 998
 999static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1000{
1001	smp_mb__before_clear_bit();
1002	clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1003	smp_mb__after_clear_bit();
1004	wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1005	rpc_wake_up(&clp->cl_rpcwaitq);
1006}
1007
1008/*
1009 * Schedule the nfs_client asynchronous state management routine
1010 */
1011void nfs4_schedule_state_manager(struct nfs_client *clp)
1012{
1013	struct task_struct *task;
 
1014
1015	if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1016		return;
1017	__module_get(THIS_MODULE);
1018	atomic_inc(&clp->cl_count);
1019	task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
1020				rpc_peeraddr2str(clp->cl_rpcclient,
1021							RPC_DISPLAY_ADDR));
1022	if (!IS_ERR(task))
1023		return;
1024	nfs4_clear_state_manager_bit(clp);
1025	nfs_put_client(clp);
1026	module_put(THIS_MODULE);
 
 
 
 
 
 
 
 
1027}
1028
1029/*
1030 * Schedule a lease recovery attempt
1031 */
1032void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1033{
1034	if (!clp)
1035		return;
1036	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1037		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
 
 
1038	nfs4_schedule_state_manager(clp);
1039}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1040
1041void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1042{
1043	nfs_handle_cb_pathdown(clp);
1044	nfs4_schedule_state_manager(clp);
1045}
1046
1047static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1048{
1049
 
 
1050	set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1051	/* Don't recover state that expired before the reboot */
1052	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1053		clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1054		return 0;
1055	}
1056	set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1057	set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1058	return 1;
1059}
1060
1061static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1062{
 
 
1063	set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1064	clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1065	set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1066	set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1067	return 1;
1068}
1069
1070void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1071{
1072	struct nfs_client *clp = server->nfs_client;
1073
1074	nfs4_state_mark_reclaim_nograce(clp, state);
 
 
 
1075	nfs4_schedule_state_manager(clp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1076}
1077
 
1078static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1079{
1080	struct inode *inode = state->inode;
1081	struct nfs_inode *nfsi = NFS_I(inode);
1082	struct file_lock *fl;
1083	int status = 0;
 
 
1084
1085	if (inode->i_flock == NULL)
1086		return 0;
1087
 
 
1088	/* Guard against delegation returns and new lock/unlock calls */
1089	down_write(&nfsi->rwsem);
1090	/* Protect inode->i_flock using the BKL */
1091	lock_flocks();
1092	for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1093		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1094			continue;
1095		if (nfs_file_open_context(fl->fl_file)->state != state)
1096			continue;
1097		unlock_flocks();
1098		status = ops->recover_lock(state, fl);
1099		switch (status) {
1100			case 0:
1101				break;
1102			case -ESTALE:
1103			case -NFS4ERR_ADMIN_REVOKED:
1104			case -NFS4ERR_STALE_STATEID:
1105			case -NFS4ERR_BAD_STATEID:
1106			case -NFS4ERR_EXPIRED:
1107			case -NFS4ERR_NO_GRACE:
1108			case -NFS4ERR_STALE_CLIENTID:
1109			case -NFS4ERR_BADSESSION:
1110			case -NFS4ERR_BADSLOT:
1111			case -NFS4ERR_BAD_HIGH_SLOT:
1112			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1113				goto out;
1114			default:
1115				printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1116						__func__, status);
1117			case -ENOMEM:
1118			case -NFS4ERR_DENIED:
1119			case -NFS4ERR_RECLAIM_BAD:
1120			case -NFS4ERR_RECLAIM_CONFLICT:
1121				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
1122				status = 0;
1123		}
1124		lock_flocks();
 
 
 
 
1125	}
1126	unlock_flocks();
1127out:
1128	up_write(&nfsi->rwsem);
1129	return status;
1130}
1131
1132static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1133{
1134	struct nfs4_state *state;
1135	struct nfs4_lock_state *lock;
1136	int status = 0;
1137
1138	/* Note: we rely on the sp->so_states list being ordered 
1139	 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1140	 * states first.
1141	 * This is needed to ensure that the server won't give us any
1142	 * read delegations that we have to return if, say, we are
1143	 * recovering after a network partition or a reboot from a
1144	 * server that doesn't support a grace period.
1145	 */
1146restart:
1147	spin_lock(&sp->so_lock);
 
 
1148	list_for_each_entry(state, &sp->so_states, open_states) {
1149		if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1150			continue;
 
 
1151		if (state->state == 0)
1152			continue;
1153		atomic_inc(&state->count);
1154		spin_unlock(&sp->so_lock);
1155		status = ops->recover_open(sp, state);
1156		if (status >= 0) {
1157			status = nfs4_reclaim_locks(state, ops);
1158			if (status >= 0) {
1159				list_for_each_entry(lock, &state->lock_states, ls_locks) {
1160					if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1161						printk("%s: Lock reclaim failed!\n",
1162							__func__);
 
 
 
 
 
1163				}
 
 
1164				nfs4_put_open_state(state);
 
1165				goto restart;
1166			}
1167		}
1168		switch (status) {
1169			default:
1170				printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1171						__func__, status);
1172			case -ENOENT:
1173			case -ENOMEM:
 
 
 
1174			case -ESTALE:
1175				/*
1176				 * Open state on this file cannot be recovered
1177				 * All we can do is revert to using the zero stateid.
1178				 */
1179				memset(state->stateid.data, 0,
1180					sizeof(state->stateid.data));
1181				/* Mark the file as being 'closed' */
1182				state->state = 0;
1183				break;
1184			case -EKEYEXPIRED:
1185				/*
1186				 * User RPCSEC_GSS context has expired.
1187				 * We cannot recover this stateid now, so
1188				 * skip it and allow recovery thread to
1189				 * proceed.
1190				 */
1191				break;
 
 
1192			case -NFS4ERR_ADMIN_REVOKED:
1193			case -NFS4ERR_STALE_STATEID:
 
1194			case -NFS4ERR_BAD_STATEID:
1195			case -NFS4ERR_RECLAIM_BAD:
1196			case -NFS4ERR_RECLAIM_CONFLICT:
1197				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1198				break;
1199			case -NFS4ERR_EXPIRED:
1200			case -NFS4ERR_NO_GRACE:
1201				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1202			case -NFS4ERR_STALE_CLIENTID:
1203			case -NFS4ERR_BADSESSION:
1204			case -NFS4ERR_BADSLOT:
1205			case -NFS4ERR_BAD_HIGH_SLOT:
1206			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1207				goto out_err;
1208		}
1209		nfs4_put_open_state(state);
 
1210		goto restart;
1211	}
 
1212	spin_unlock(&sp->so_lock);
1213	return 0;
1214out_err:
1215	nfs4_put_open_state(state);
 
 
 
1216	return status;
1217}
1218
1219static void nfs4_clear_open_state(struct nfs4_state *state)
1220{
1221	struct nfs4_lock_state *lock;
1222
1223	clear_bit(NFS_DELEGATED_STATE, &state->flags);
1224	clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1225	clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226	clear_bit(NFS_O_RDWR_STATE, &state->flags);
 
1227	list_for_each_entry(lock, &state->lock_states, ls_locks) {
1228		lock->ls_seqid.flags = 0;
1229		lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1230	}
 
1231}
1232
1233static void nfs4_reset_seqids(struct nfs_server *server,
1234	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1235{
1236	struct nfs_client *clp = server->nfs_client;
1237	struct nfs4_state_owner *sp;
1238	struct rb_node *pos;
1239	struct nfs4_state *state;
1240
1241	spin_lock(&clp->cl_lock);
1242	for (pos = rb_first(&server->state_owners);
1243	     pos != NULL;
1244	     pos = rb_next(pos)) {
1245		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1246		sp->so_seqid.flags = 0;
1247		spin_lock(&sp->so_lock);
1248		list_for_each_entry(state, &sp->so_states, open_states) {
1249			if (mark_reclaim(clp, state))
1250				nfs4_clear_open_state(state);
1251		}
1252		spin_unlock(&sp->so_lock);
1253	}
1254	spin_unlock(&clp->cl_lock);
1255}
1256
1257static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1258	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1259{
1260	struct nfs_server *server;
1261
1262	rcu_read_lock();
1263	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1264		nfs4_reset_seqids(server, mark_reclaim);
1265	rcu_read_unlock();
1266}
1267
1268static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1269{
1270	/* Mark all delegations for reclaim */
1271	nfs_delegation_mark_reclaim(clp);
1272	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1273}
1274
1275static void nfs4_reclaim_complete(struct nfs_client *clp,
1276				 const struct nfs4_state_recovery_ops *ops)
 
1277{
1278	/* Notify the server we're done reclaiming our state */
1279	if (ops->reclaim_complete)
1280		(void)ops->reclaim_complete(clp);
1281}
1282
1283static void nfs4_clear_reclaim_server(struct nfs_server *server)
1284{
1285	struct nfs_client *clp = server->nfs_client;
1286	struct nfs4_state_owner *sp;
1287	struct rb_node *pos;
1288	struct nfs4_state *state;
1289
1290	spin_lock(&clp->cl_lock);
1291	for (pos = rb_first(&server->state_owners);
1292	     pos != NULL;
1293	     pos = rb_next(pos)) {
1294		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1295		spin_lock(&sp->so_lock);
1296		list_for_each_entry(state, &sp->so_states, open_states) {
1297			if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1298						&state->flags))
1299				continue;
1300			nfs4_state_mark_reclaim_nograce(clp, state);
1301		}
1302		spin_unlock(&sp->so_lock);
1303	}
1304	spin_unlock(&clp->cl_lock);
1305}
1306
1307static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1308{
1309	struct nfs_server *server;
1310
1311	if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1312		return 0;
1313
1314	rcu_read_lock();
1315	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1316		nfs4_clear_reclaim_server(server);
1317	rcu_read_unlock();
1318
1319	nfs_delegation_reap_unclaimed(clp);
1320	return 1;
1321}
1322
1323static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1324{
 
 
 
1325	if (!nfs4_state_clear_reclaim_reboot(clp))
1326		return;
1327	nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1328}
1329
1330static void nfs_delegation_clear_all(struct nfs_client *clp)
1331{
1332	nfs_delegation_mark_reclaim(clp);
1333	nfs_delegation_reap_unclaimed(clp);
1334}
1335
1336static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1337{
1338	nfs_delegation_clear_all(clp);
1339	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1340}
1341
1342static void nfs4_warn_keyexpired(const char *s)
1343{
1344	printk_ratelimited(KERN_WARNING "Error: state manager"
1345			" encountered RPCSEC_GSS session"
1346			" expired against NFSv4 server %s.\n",
1347			s);
1348}
1349
1350static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1351{
1352	switch (error) {
 
 
1353		case -NFS4ERR_CB_PATH_DOWN:
1354			nfs_handle_cb_pathdown(clp);
1355			return 0;
1356		case -NFS4ERR_NO_GRACE:
1357			nfs4_state_end_reclaim_reboot(clp);
1358			return 0;
1359		case -NFS4ERR_STALE_CLIENTID:
1360		case -NFS4ERR_LEASE_MOVED:
1361			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1362			nfs4_state_clear_reclaim_reboot(clp);
1363			nfs4_state_start_reclaim_reboot(clp);
1364			break;
1365		case -NFS4ERR_EXPIRED:
1366			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1367			nfs4_state_start_reclaim_nograce(clp);
1368			break;
1369		case -NFS4ERR_BADSESSION:
1370		case -NFS4ERR_BADSLOT:
1371		case -NFS4ERR_BAD_HIGH_SLOT:
1372		case -NFS4ERR_DEADSESSION:
1373		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1374		case -NFS4ERR_SEQ_FALSE_RETRY:
1375		case -NFS4ERR_SEQ_MISORDERED:
1376			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1377			/* Zero session reset errors */
1378			return 0;
1379		case -EKEYEXPIRED:
1380			/* Nothing we can do */
1381			nfs4_warn_keyexpired(clp->cl_hostname);
1382			return 0;
 
 
 
1383	}
1384	return error;
 
 
1385}
1386
1387static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1388{
1389	struct nfs4_state_owner *sp;
1390	struct nfs_server *server;
1391	struct rb_node *pos;
1392	int status = 0;
1393
1394restart:
1395	rcu_read_lock();
1396	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 
1397		spin_lock(&clp->cl_lock);
1398		for (pos = rb_first(&server->state_owners);
1399		     pos != NULL;
1400		     pos = rb_next(pos)) {
1401			sp = rb_entry(pos,
1402				struct nfs4_state_owner, so_server_node);
1403			if (!test_and_clear_bit(ops->owner_flag_bit,
1404							&sp->so_flags))
1405				continue;
1406			atomic_inc(&sp->so_count);
 
1407			spin_unlock(&clp->cl_lock);
1408			rcu_read_unlock();
1409
1410			status = nfs4_reclaim_open_state(sp, ops);
1411			if (status < 0) {
1412				set_bit(ops->owner_flag_bit, &sp->so_flags);
1413				nfs4_put_state_owner(sp);
1414				return nfs4_recovery_handle_error(clp, status);
 
1415			}
1416
1417			nfs4_put_state_owner(sp);
1418			goto restart;
1419		}
1420		spin_unlock(&clp->cl_lock);
1421	}
1422	rcu_read_unlock();
1423	return status;
1424}
1425
1426static int nfs4_check_lease(struct nfs_client *clp)
1427{
1428	struct rpc_cred *cred;
1429	const struct nfs4_state_maintenance_ops *ops =
1430		clp->cl_mvops->state_renewal_ops;
1431	int status = -NFS4ERR_EXPIRED;
1432
1433	/* Is the client already known to have an expired lease? */
1434	if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1435		return 0;
1436	spin_lock(&clp->cl_lock);
1437	cred = ops->get_state_renewal_cred_locked(clp);
1438	spin_unlock(&clp->cl_lock);
1439	if (cred == NULL) {
1440		cred = nfs4_get_setclientid_cred(clp);
 
1441		if (cred == NULL)
1442			goto out;
1443	}
1444	status = ops->renew_lease(clp, cred);
1445	put_rpccred(cred);
 
 
 
 
1446out:
1447	return nfs4_recovery_handle_error(clp, status);
1448}
1449
1450static int nfs4_reclaim_lease(struct nfs_client *clp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1451{
1452	struct rpc_cred *cred;
1453	const struct nfs4_state_recovery_ops *ops =
1454		clp->cl_mvops->reboot_recovery_ops;
1455	int status = -ENOENT;
1456
1457	cred = ops->get_clid_cred(clp);
1458	if (cred != NULL) {
1459		status = ops->establish_clid(clp, cred);
1460		put_rpccred(cred);
1461		/* Handle case where the user hasn't set up machine creds */
1462		if (status == -EACCES && cred == clp->cl_machine_cred) {
1463			nfs4_clear_machine_cred(clp);
1464			status = -EAGAIN;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1465		}
1466		if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1467			status = -EPROTONOSUPPORT;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1468	}
 
 
 
 
1469	return status;
1470}
1471
1472#ifdef CONFIG_NFS_V4_1
1473void nfs4_schedule_session_recovery(struct nfs4_session *session)
1474{
1475	struct nfs_client *clp = session->clp;
1476
1477	set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1478	nfs4_schedule_lease_recovery(clp);
 
 
 
 
 
 
1479}
1480EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1481
1482void nfs41_handle_recall_slot(struct nfs_client *clp)
1483{
1484	set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
 
1485	nfs4_schedule_state_manager(clp);
1486}
1487
1488static void nfs4_reset_all_state(struct nfs_client *clp)
1489{
1490	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1491		clp->cl_boot_time = CURRENT_TIME;
 
1492		nfs4_state_start_reclaim_nograce(clp);
 
 
1493		nfs4_schedule_state_manager(clp);
1494	}
1495}
1496
1497static void nfs41_handle_server_reboot(struct nfs_client *clp)
1498{
1499	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1500		nfs4_state_start_reclaim_reboot(clp);
 
 
1501		nfs4_schedule_state_manager(clp);
1502	}
1503}
1504
1505static void nfs41_handle_state_revoked(struct nfs_client *clp)
1506{
1507	/* Temporary */
1508	nfs4_reset_all_state(clp);
 
 
 
 
 
 
 
 
 
1509}
1510
1511static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1512{
1513	/* This will need to handle layouts too */
1514	nfs_expire_all_delegations(clp);
 
 
 
 
 
 
 
 
 
 
 
 
 
1515}
1516
1517static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1518{
1519	nfs_expire_all_delegations(clp);
1520	if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1521		nfs4_schedule_state_manager(clp);
1522}
1523
1524void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
 
1525{
1526	if (!flags)
1527		return;
1528	else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
 
 
 
 
 
 
 
 
 
 
 
 
1529		nfs41_handle_server_reboot(clp);
1530	else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1531			    SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1532			    SEQ4_STATUS_ADMIN_STATE_REVOKED |
1533			    SEQ4_STATUS_LEASE_MOVED))
1534		nfs41_handle_state_revoked(clp);
1535	else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
 
 
1536		nfs41_handle_recallable_state_revoked(clp);
 
 
 
1537	else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1538			    SEQ4_STATUS_BACKCHANNEL_FAULT |
1539			    SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1540		nfs41_handle_cb_path_down(clp);
1541}
1542
1543static int nfs4_reset_session(struct nfs_client *clp)
1544{
 
1545	int status;
1546
 
 
1547	nfs4_begin_drain_session(clp);
1548	status = nfs4_proc_destroy_session(clp->cl_session);
1549	if (status && status != -NFS4ERR_BADSESSION &&
1550	    status != -NFS4ERR_DEADSESSION) {
 
 
 
 
 
 
 
 
 
 
 
1551		status = nfs4_recovery_handle_error(clp, status);
1552		goto out;
1553	}
1554
1555	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1556	status = nfs4_proc_create_session(clp);
1557	if (status) {
1558		status = nfs4_recovery_handle_error(clp, status);
 
 
1559		goto out;
1560	}
1561	clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1562	/* create_session negotiated new slot table */
1563	clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1564
1565	 /* Let the state manager reestablish state */
1566	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1567		nfs41_setup_state_renewal(clp);
1568out:
 
 
1569	return status;
1570}
1571
1572static int nfs4_recall_slot(struct nfs_client *clp)
1573{
1574	struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1575	struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1576	struct nfs4_slot *new, *old;
1577	int i;
1578
 
 
1579	nfs4_begin_drain_session(clp);
1580	new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1581		      GFP_NOFS);
1582        if (!new)
1583		return -ENOMEM;
1584
1585	spin_lock(&fc_tbl->slot_tbl_lock);
1586	for (i = 0; i < fc_tbl->target_max_slots; i++)
1587		new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1588	old = fc_tbl->slots;
1589	fc_tbl->slots = new;
1590	fc_tbl->max_slots = fc_tbl->target_max_slots;
1591	fc_tbl->target_max_slots = 0;
1592	fc_attrs->max_reqs = fc_tbl->max_slots;
1593	spin_unlock(&fc_tbl->slot_tbl_lock);
1594
1595	kfree(old);
1596	nfs4_end_drain_session(clp);
1597	return 0;
1598}
1599
1600#else /* CONFIG_NFS_V4_1 */
1601static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1602static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1603static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1604#endif /* CONFIG_NFS_V4_1 */
1605
1606/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1607 * on EXCHANGE_ID for v4.1
1608 */
1609static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1610{
1611	switch (status) {
1612	case -NFS4ERR_CLID_INUSE:
1613	case -NFS4ERR_STALE_CLIENTID:
1614		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1615		break;
1616	case -NFS4ERR_DELAY:
1617	case -ETIMEDOUT:
1618	case -EAGAIN:
1619		ssleep(1);
 
1620		break;
1621
1622	case -EKEYEXPIRED:
1623		nfs4_warn_keyexpired(clp->cl_hostname);
1624	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1625				 * in nfs4_exchange_id */
1626	default:
1627		return;
1628	}
1629	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
 
 
 
 
 
 
 
1630}
 
1631
1632static void nfs4_state_manager(struct nfs_client *clp)
1633{
1634	int status = 0;
 
1635
1636	/* Ensure exclusive access to NFSv4 state */
1637	do {
1638		if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
 
 
 
 
 
 
 
 
 
1639			/* We're going to have to re-establish a clientid */
1640			status = nfs4_reclaim_lease(clp);
1641			if (status) {
1642				nfs4_set_lease_expired(clp, status);
1643				if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1644							&clp->cl_state))
1645					continue;
1646				if (clp->cl_cons_state ==
1647							NFS_CS_SESSION_INITING)
1648					nfs_mark_client_ready(clp, status);
1649				goto out_error;
1650			}
1651			clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1652
1653			if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1654					       &clp->cl_state))
1655				nfs4_state_start_reclaim_nograce(clp);
1656			else
1657				set_bit(NFS4CLNT_RECLAIM_REBOOT,
1658					&clp->cl_state);
 
 
 
1659
1660			pnfs_destroy_all_layouts(clp);
 
 
 
 
 
 
 
1661		}
1662
1663		if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
 
1664			status = nfs4_check_lease(clp);
1665			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1666				continue;
1667			if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1668				goto out_error;
 
1669		}
1670
1671		/* Initialize or reset the session */
1672		if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1673		   && nfs4_has_session(clp)) {
1674			status = nfs4_reset_session(clp);
1675			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1676				continue;
 
 
 
 
1677			if (status < 0)
1678				goto out_error;
1679		}
1680
1681		/* First recover reboot state... */
1682		if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
 
1683			status = nfs4_do_reclaim(clp,
1684				clp->cl_mvops->reboot_recovery_ops);
1685			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1686			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1687				continue;
1688			nfs4_state_end_reclaim_reboot(clp);
1689			if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1690				continue;
1691			if (status < 0)
1692				goto out_error;
 
 
 
 
 
 
 
 
1693		}
1694
1695		/* Now recover expired state... */
1696		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
 
1697			status = nfs4_do_reclaim(clp,
1698				clp->cl_mvops->nograce_recovery_ops);
1699			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1700			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1701			    test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1702				continue;
1703			if (status < 0)
1704				goto out_error;
1705		}
1706
1707		nfs4_end_drain_session(clp);
1708		if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1709			nfs_client_return_marked_delegations(clp);
1710			continue;
1711		}
1712		/* Recall session slots */
1713		if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1714		   && nfs4_has_session(clp)) {
1715			status = nfs4_recall_slot(clp);
1716			if (status < 0)
1717				goto out_error;
1718			continue;
1719		}
1720
1721
1722		nfs4_clear_state_manager_bit(clp);
1723		/* Did we race with an attempt to give us more work? */
1724		if (clp->cl_state == 0)
1725			break;
1726		if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1727			break;
1728	} while (atomic_read(&clp->cl_count) > 1);
1729	return;
1730out_error:
1731	printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1732			" with error %d\n", clp->cl_hostname, -status);
 
 
 
 
1733	nfs4_end_drain_session(clp);
1734	nfs4_clear_state_manager_bit(clp);
1735}
1736
1737static int nfs4_run_state_manager(void *ptr)
1738{
1739	struct nfs_client *clp = ptr;
1740
1741	allow_signal(SIGKILL);
1742	nfs4_state_manager(clp);
1743	nfs_put_client(clp);
1744	module_put_and_exit(0);
1745	return 0;
1746}
1747
1748/*
1749 * Local variables:
1750 *  c-basic-offset: 8
1751 * End:
1752 */