nfs4state.c 57.4 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
/*
 *  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.
 */

41
#include <linux/kernel.h>
L
Linus Torvalds 已提交
42
#include <linux/slab.h>
43
#include <linux/fs.h>
L
Linus Torvalds 已提交
44 45
#include <linux/nfs_fs.h>
#include <linux/nfs_idmap.h>
46 47
#include <linux/kthread.h>
#include <linux/module.h>
48
#include <linux/random.h>
49
#include <linux/ratelimit.h>
L
Linus Torvalds 已提交
50 51
#include <linux/workqueue.h>
#include <linux/bitops.h>
52
#include <linux/jiffies.h>
L
Linus Torvalds 已提交
53

54 55
#include <linux/sunrpc/clnt.h>

56
#include "nfs4_fs.h"
L
Linus Torvalds 已提交
57 58
#include "callback.h"
#include "delegation.h"
59
#include "internal.h"
60
#include "nfs4session.h"
61
#include "pnfs.h"
62
#include "netns.h"
L
Linus Torvalds 已提交
63

C
Chuck Lever 已提交
64 65
#define NFSDBG_FACILITY		NFSDBG_STATE

L
Linus Torvalds 已提交
66 67
#define OPENOWNER_POOL_SIZE	8

68
const nfs4_stateid zero_stateid;
69
static DEFINE_MUTEX(nfs_clid_init_mutex);
L
Linus Torvalds 已提交
70

71
int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
L
Linus Torvalds 已提交
72
{
73 74 75 76
	struct nfs4_setclientid_res clid = {
		.clientid = clp->cl_clientid,
		.confirm = clp->cl_confirm,
	};
77 78
	unsigned short port;
	int status;
79
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
80

81 82
	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
		goto do_confirm;
83
	port = nn->nfs_callback_tcpport;
84
	if (clp->cl_addr.ss_family == AF_INET6)
85
		port = nn->nfs_callback_tcpport6;
86

87 88 89
	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
	if (status != 0)
		goto out;
90 91 92 93
	clp->cl_clientid = clid.clientid;
	clp->cl_confirm = clid.confirm;
	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
do_confirm:
94 95 96
	status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
	if (status != 0)
		goto out;
97
	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 99
	nfs4_schedule_state_renewal(clp);
out:
L
Linus Torvalds 已提交
100 101 102
	return status;
}

103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
/**
 * 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,
	};
124
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
125 126 127
	unsigned short port;
	int status;

128
	port = nn->nfs_callback_tcpport;
129
	if (clp->cl_addr.ss_family == AF_INET6)
130
		port = nn->nfs_callback_tcpport6;
131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152

	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);
	switch (status) {
	case -NFS4ERR_STALE_CLIENTID:
		set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
	case 0:
		/* 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);
		break;
	}

out:
	return status;
}

153
struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173
{
	struct rpc_cred *cred = NULL;

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

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

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

174 175
static struct rpc_cred *
nfs4_get_renew_cred_server_locked(struct nfs_server *server)
176
{
177
	struct rpc_cred *cred = NULL;
178
	struct nfs4_state_owner *sp;
179
	struct rb_node *pos;
180

181 182 183 184
	for (pos = rb_first(&server->state_owners);
	     pos != NULL;
	     pos = rb_next(pos)) {
		sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
185 186 187 188 189 190 191 192
		if (list_empty(&sp->so_states))
			continue;
		cred = get_rpccred(sp->so_cred);
		break;
	}
	return cred;
}

193 194 195 196 197 198 199 200 201 202 203 204
/**
 * 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;

205 206 207 208 209
	/* Use machine credentials if available */
	cred = nfs4_get_machine_cred_locked(clp);
	if (cred != NULL)
		goto out;

210 211 212 213 214 215 216
	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();
217 218

out:
219 220 221
	return cred;
}

222 223
#if defined(CONFIG_NFS_V4_1)

R
Ricardo Labiaga 已提交
224 225 226 227 228
static int nfs41_setup_state_renewal(struct nfs_client *clp)
{
	int status;
	struct nfs_fsinfo fsinfo;

229 230 231 232 233
	if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
		nfs4_schedule_state_renewal(clp);
		return 0;
	}

R
Ricardo Labiaga 已提交
234 235 236 237 238 239 240 241 242 243 244 245 246 247
	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;
}

248 249 250 251 252
/*
 * Back channel returns NFS4ERR_DELAY for new requests when
 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
 * is ended.
 */
253
static void nfs4_end_drain_session(struct nfs_client *clp)
254
{
255
	struct nfs4_session *ses = clp->cl_session;
256
	struct nfs4_slot_table *tbl;
257

258 259
	if (ses == NULL)
		return;
260
	tbl = &ses->fc_slot_table;
261
	if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
262
		spin_lock(&tbl->slot_tbl_lock);
263
		nfs41_wake_slot_table(tbl);
264
		spin_unlock(&tbl->slot_tbl_lock);
265
	}
266 267
}

268 269 270 271 272 273 274 275 276 277
/*
 * Signal state manager thread if session fore channel is drained
 */
void nfs4_session_drain_complete(struct nfs4_session *session,
		struct nfs4_slot_table *tbl)
{
	if (nfs4_session_draining(session))
		complete(&tbl->complete);
}

278
static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
279 280
{
	spin_lock(&tbl->slot_tbl_lock);
281
	if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
282
		INIT_COMPLETION(tbl->complete);
283
		spin_unlock(&tbl->slot_tbl_lock);
284
		return wait_for_completion_interruptible(&tbl->complete);
285 286 287 288 289
	}
	spin_unlock(&tbl->slot_tbl_lock);
	return 0;
}

290 291 292 293 294 295 296 297 298 299 300 301 302 303
static int nfs4_begin_drain_session(struct nfs_client *clp)
{
	struct nfs4_session *ses = clp->cl_session;
	int ret = 0;

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

304 305 306 307 308 309 310 311 312
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);
}

313 314 315 316
int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
{
	int status;

317 318
	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
		goto do_confirm;
319
	nfs4_begin_drain_session(clp);
320
	status = nfs4_proc_exchange_id(clp, cred);
R
Ricardo Labiaga 已提交
321 322
	if (status != 0)
		goto out;
323 324
	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
do_confirm:
325
	status = nfs4_proc_create_session(clp, cred);
R
Ricardo Labiaga 已提交
326 327
	if (status != 0)
		goto out;
328
	nfs41_finish_session_reset(clp);
R
Ricardo Labiaga 已提交
329 330
	nfs_mark_client_ready(clp, NFS_CS_READY);
out:
331 332 333
	return status;
}

334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355
/**
 * 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;
356
	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
357 358 359 360

	return nfs41_walk_client_list(clp, result, cred);
}

361 362 363 364 365 366 367 368 369 370 371 372
struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
{
	struct rpc_cred *cred;

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

#endif /* CONFIG_NFS_V4_1 */

373 374
static struct rpc_cred *
nfs4_get_setclientid_cred_server(struct nfs_server *server)
375
{
376 377
	struct nfs_client *clp = server->nfs_client;
	struct rpc_cred *cred = NULL;
378
	struct nfs4_state_owner *sp;
379
	struct rb_node *pos;
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399

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

/**
 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
 * @clp: client state handle
 *
 * Returns an rpc_cred with reference count bumped, or NULL.
 */
struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
{
	struct nfs_server *server;
400
	struct rpc_cred *cred;
401

402 403
	spin_lock(&clp->cl_lock);
	cred = nfs4_get_machine_cred_locked(clp);
404
	spin_unlock(&clp->cl_lock);
405 406
	if (cred != NULL)
		goto out;
407 408 409 410 411 412

	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		cred = nfs4_get_setclientid_cred_server(server);
		if (cred != NULL)
			break;
413
	}
414 415
	rcu_read_unlock();

416 417
out:
	return cred;
418 419
}

L
Linus Torvalds 已提交
420
static struct nfs4_state_owner *
421
nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
L
Linus Torvalds 已提交
422
{
423
	struct rb_node **p = &server->state_owners.rb_node,
424
		       *parent = NULL;
425
	struct nfs4_state_owner *sp;
L
Linus Torvalds 已提交
426

427 428
	while (*p != NULL) {
		parent = *p;
429
		sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
430 431 432 433 434 435

		if (cred < sp->so_cred)
			p = &parent->rb_left;
		else if (cred > sp->so_cred)
			p = &parent->rb_right;
		else {
436 437
			if (!list_empty(&sp->so_lru))
				list_del_init(&sp->so_lru);
438
			atomic_inc(&sp->so_count);
439
			return sp;
440
		}
L
Linus Torvalds 已提交
441
	}
442
	return NULL;
L
Linus Torvalds 已提交
443 444
}

445
static struct nfs4_state_owner *
446
nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
447
{
448 449
	struct nfs_server *server = new->so_server;
	struct rb_node **p = &server->state_owners.rb_node,
450 451
		       *parent = NULL;
	struct nfs4_state_owner *sp;
452
	int err;
453 454 455

	while (*p != NULL) {
		parent = *p;
456
		sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
457 458 459 460 461 462

		if (new->so_cred < sp->so_cred)
			p = &parent->rb_left;
		else if (new->so_cred > sp->so_cred)
			p = &parent->rb_right;
		else {
463 464
			if (!list_empty(&sp->so_lru))
				list_del_init(&sp->so_lru);
465 466 467 468
			atomic_inc(&sp->so_count);
			return sp;
		}
	}
469
	err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
470 471
	if (err)
		return ERR_PTR(err);
472 473
	rb_link_node(&new->so_server_node, parent, p);
	rb_insert_color(&new->so_server_node, &server->state_owners);
474 475 476 477
	return new;
}

static void
478
nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
479
{
480 481 482 483
	struct nfs_server *server = sp->so_server;

	if (!RB_EMPTY_NODE(&sp->so_server_node))
		rb_erase(&sp->so_server_node, &server->state_owners);
484
	ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
485 486
}

487 488 489
static void
nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
{
490
	sc->create_time = ktime_get();
491 492 493 494 495 496 497 498 499 500 501 502 503
	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);
}

L
Linus Torvalds 已提交
504 505 506 507 508 509
/*
 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 * create a new state_owner.
 *
 */
static struct nfs4_state_owner *
510 511 512
nfs4_alloc_state_owner(struct nfs_server *server,
		struct rpc_cred *cred,
		gfp_t gfp_flags)
L
Linus Torvalds 已提交
513 514 515
{
	struct nfs4_state_owner *sp;

516
	sp = kzalloc(sizeof(*sp), gfp_flags);
L
Linus Torvalds 已提交
517 518
	if (!sp)
		return NULL;
519 520
	sp->so_server = server;
	sp->so_cred = get_rpccred(cred);
521
	spin_lock_init(&sp->so_lock);
L
Linus Torvalds 已提交
522
	INIT_LIST_HEAD(&sp->so_states);
523
	nfs4_init_seqid_counter(&sp->so_seqid);
L
Linus Torvalds 已提交
524
	atomic_set(&sp->so_count, 1);
525
	INIT_LIST_HEAD(&sp->so_lru);
L
Linus Torvalds 已提交
526 527 528
	return sp;
}

529
static void
L
Linus Torvalds 已提交
530 531
nfs4_drop_state_owner(struct nfs4_state_owner *sp)
{
532 533 534
	struct rb_node *rb_node = &sp->so_server_node;

	if (!RB_EMPTY_NODE(rb_node)) {
535 536
		struct nfs_server *server = sp->so_server;
		struct nfs_client *clp = server->nfs_client;
537 538

		spin_lock(&clp->cl_lock);
539 540 541 542
		if (!RB_EMPTY_NODE(rb_node)) {
			rb_erase(rb_node, &server->state_owners);
			RB_CLEAR_NODE(rb_node);
		}
543 544
		spin_unlock(&clp->cl_lock);
	}
L
Linus Torvalds 已提交
545 546
}

547 548
static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
{
549
	nfs4_destroy_seqid_counter(&sp->so_seqid);
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
	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);
	}
}

579 580 581 582 583 584 585 586
/**
 * 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,
587 588
					      struct rpc_cred *cred,
					      gfp_t gfp_flags)
L
Linus Torvalds 已提交
589
{
590
	struct nfs_client *clp = server->nfs_client;
L
Linus Torvalds 已提交
591 592 593
	struct nfs4_state_owner *sp, *new;

	spin_lock(&clp->cl_lock);
594
	sp = nfs4_find_state_owner_locked(server, cred);
L
Linus Torvalds 已提交
595 596
	spin_unlock(&clp->cl_lock);
	if (sp != NULL)
597
		goto out;
598
	new = nfs4_alloc_state_owner(server, cred, gfp_flags);
599
	if (new == NULL)
600
		goto out;
601 602 603 604 605 606 607
	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));
608 609
	if (sp != new)
		nfs4_free_state_owner(new);
610 611
out:
	nfs4_gc_state_owners(server);
612
	return sp;
L
Linus Torvalds 已提交
613 614
}

615 616 617
/**
 * nfs4_put_state_owner - Release a nfs4_state_owner
 * @sp: state owner data to release
618 619 620 621 622 623 624 625
 *
 * 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.
626
 */
L
Linus Torvalds 已提交
627 628
void nfs4_put_state_owner(struct nfs4_state_owner *sp)
{
629 630
	struct nfs_server *server = sp->so_server;
	struct nfs_client *clp = server->nfs_client;
L
Linus Torvalds 已提交
631 632 633

	if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
		return;
634

635 636 637
	sp->so_expires = jiffies;
	list_add_tail(&sp->so_lru, &server->state_owners_lru);
	spin_unlock(&clp->cl_lock);
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
}

/**
 * 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);
	}
L
Linus Torvalds 已提交
658
	spin_unlock(&clp->cl_lock);
659 660 661 662 663

	list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
		list_del(&sp->so_lru);
		nfs4_free_state_owner(sp);
	}
L
Linus Torvalds 已提交
664 665 666 667 668 669 670
}

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

671
	state = kzalloc(sizeof(*state), GFP_NOFS);
L
Linus Torvalds 已提交
672 673 674 675
	if (!state)
		return NULL;
	atomic_set(&state->count, 1);
	INIT_LIST_HEAD(&state->lock_states);
676
	spin_lock_init(&state->state_lock);
677
	seqlock_init(&state->seqlock);
L
Linus Torvalds 已提交
678 679 680
	return state;
}

681
void
682
nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
683
{
684
	if (state->state == fmode)
685 686
		return;
	/* NB! List reordering - see the reclaim code for why.  */
687 688
	if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
		if (fmode & FMODE_WRITE)
689 690 691 692
			list_move(&state->open_states, &state->owner->so_states);
		else
			list_move_tail(&state->open_states, &state->owner->so_states);
	}
693
	state->state = fmode;
694 695
}

L
Linus Torvalds 已提交
696 697 698 699 700 701 702
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) {
703
		if (state->owner != owner)
L
Linus Torvalds 已提交
704
			continue;
705
		if (atomic_inc_not_zero(&state->count))
L
Linus Torvalds 已提交
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
			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();
729
	spin_lock(&owner->so_lock);
L
Linus Torvalds 已提交
730 731 732 733 734 735 736
	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);
737 738
		ihold(inode);
		state->inode = inode;
L
Linus Torvalds 已提交
739
		spin_unlock(&inode->i_lock);
740 741 742 743
		/* 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);
L
Linus Torvalds 已提交
744 745
	} else {
		spin_unlock(&inode->i_lock);
746
		spin_unlock(&owner->so_lock);
L
Linus Torvalds 已提交
747 748 749 750 751 752 753 754 755 756 757 758
		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;

759
	if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
L
Linus Torvalds 已提交
760
		return;
761
	spin_lock(&inode->i_lock);
762
	list_del(&state->inode_states);
L
Linus Torvalds 已提交
763
	list_del(&state->open_states);
764 765
	spin_unlock(&inode->i_lock);
	spin_unlock(&owner->so_lock);
L
Linus Torvalds 已提交
766 767 768 769 770 771
	iput(inode);
	nfs4_free_open_state(state);
	nfs4_put_state_owner(owner);
}

/*
772
 * Close the current file.
L
Linus Torvalds 已提交
773
 */
774
static void __nfs4_close(struct nfs4_state *state,
775
		fmode_t fmode, gfp_t gfp_mask, int wait)
L
Linus Torvalds 已提交
776 777
{
	struct nfs4_state_owner *owner = state->owner;
778
	int call_close = 0;
779
	fmode_t newstate;
L
Linus Torvalds 已提交
780 781 782

	atomic_inc(&owner->so_count);
	/* Protect against nfs4_find_state() */
783
	spin_lock(&owner->so_lock);
784
	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
785 786 787 788 789 790 791 792 793
		case FMODE_READ:
			state->n_rdonly--;
			break;
		case FMODE_WRITE:
			state->n_wronly--;
			break;
		case FMODE_READ|FMODE_WRITE:
			state->n_rdwr--;
	}
794
	newstate = FMODE_READ|FMODE_WRITE;
795
	if (state->n_rdwr == 0) {
796
		if (state->n_rdonly == 0) {
797
			newstate &= ~FMODE_READ;
798 799 800 801
			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) {
802
			newstate &= ~FMODE_WRITE;
803 804 805 806 807
			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);
808
	}
809
	nfs4_state_set_mode_locked(state, newstate);
810
	spin_unlock(&owner->so_lock);
811

812
	if (!call_close) {
813 814
		nfs4_put_open_state(state);
		nfs4_put_state_owner(owner);
815 816
	} else
		nfs4_do_close(state, gfp_mask, wait);
817 818
}

819
void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
820
{
821
	__nfs4_close(state, fmode, GFP_NOFS, 0);
822 823
}

824
void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
825
{
826
	__nfs4_close(state, fmode, GFP_KERNEL, 1);
L
Linus Torvalds 已提交
827 828 829 830 831 832 833
}

/*
 * Search the state->lock_states for an existing lock_owner
 * that is compatible with current->files
 */
static struct nfs4_lock_state *
834
__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
L
Linus Torvalds 已提交
835 836 837
{
	struct nfs4_lock_state *pos;
	list_for_each_entry(pos, &state->lock_states, ls_locks) {
838
		if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
L
Linus Torvalds 已提交
839
			continue;
840 841 842 843 844 845 846 847 848
		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;
		}
L
Linus Torvalds 已提交
849 850 851 852 853 854 855 856 857 858 859
		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.
 *
 */
860
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)
L
Linus Torvalds 已提交
861 862
{
	struct nfs4_lock_state *lsp;
863
	struct nfs_server *server = state->owner->so_server;
L
Linus Torvalds 已提交
864

865
	lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
L
Linus Torvalds 已提交
866 867
	if (lsp == NULL)
		return NULL;
868
	nfs4_init_seqid_counter(&lsp->ls_seqid);
L
Linus Torvalds 已提交
869
	atomic_set(&lsp->ls_count, 1);
870
	lsp->ls_state = state;
871 872 873 874 875 876 877 878 879
	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:
880
		goto out_free;
881
	}
882 883
	lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
	if (lsp->ls_seqid.owner_id < 0)
884
		goto out_free;
885
	INIT_LIST_HEAD(&lsp->ls_locks);
L
Linus Torvalds 已提交
886
	return lsp;
887 888 889
out_free:
	kfree(lsp);
	return NULL;
L
Linus Torvalds 已提交
890 891
}

892
void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
893
{
894
	ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
895
	nfs4_destroy_seqid_counter(&lsp->ls_seqid);
896 897 898
	kfree(lsp);
}

L
Linus Torvalds 已提交
899 900 901 902 903
/*
 * Return a compatible lock_state. If no initialized lock_state structure
 * exists, return an uninitialized one.
 *
 */
904
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
L
Linus Torvalds 已提交
905
{
906
	struct nfs4_lock_state *lsp, *new = NULL;
L
Linus Torvalds 已提交
907
	
908 909
	for(;;) {
		spin_lock(&state->state_lock);
910
		lsp = __nfs4_find_lock_state(state, owner, pid, type);
911 912 913 914 915 916 917 918 919 920
		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);
921
		new = nfs4_alloc_lock_state(state, owner, pid, type);
922 923 924 925
		if (new == NULL)
			return NULL;
	}
	spin_unlock(&state->state_lock);
926
	if (new != NULL)
927
		nfs4_free_lock_state(state->owner->so_server, new);
L
Linus Torvalds 已提交
928 929 930 931
	return lsp;
}

/*
932 933
 * Release reference to lock_state, and free it if we see that
 * it is no longer in use
L
Linus Torvalds 已提交
934
 */
935
void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
L
Linus Torvalds 已提交
936
{
937
	struct nfs4_state *state;
L
Linus Torvalds 已提交
938

939 940 941 942 943 944 945 946 947
	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);
948
	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
949 950 951
		if (nfs4_release_lockowner(lsp) == 0)
			return;
	}
952
	nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
L
Linus Torvalds 已提交
953 954
}

955
static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
L
Linus Torvalds 已提交
956
{
957
	struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
L
Linus Torvalds 已提交
958

959 960 961
	dst->fl_u.nfs4_fl.owner = lsp;
	atomic_inc(&lsp->ls_count);
}
L
Linus Torvalds 已提交
962

963
static void nfs4_fl_release_lock(struct file_lock *fl)
L
Linus Torvalds 已提交
964
{
965
	nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
L
Linus Torvalds 已提交
966 967
}

968
static const struct file_lock_operations nfs4_fl_lock_ops = {
969 970 971 972 973
	.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
974
{
975 976 977 978
	struct nfs4_lock_state *lsp;

	if (fl->fl_ops != NULL)
		return 0;
979 980 981
	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)
982 983
		lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
				NFS4_FLOCK_LOCK_TYPE);
984 985
	else
		return -EINVAL;
986 987 988 989 990
	if (lsp == NULL)
		return -ENOMEM;
	fl->fl_u.nfs4_fl.owner = lsp;
	fl->fl_ops = &nfs4_fl_lock_ops;
	return 0;
L
Linus Torvalds 已提交
991 992
}

993
static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
994
		const struct nfs_lockowner *lockowner)
L
Linus Torvalds 已提交
995
{
996
	struct nfs4_lock_state *lsp;
997 998
	fl_owner_t fl_owner;
	pid_t fl_pid;
999
	bool ret = false;
L
Linus Torvalds 已提交
1000

1001 1002 1003 1004

	if (lockowner == NULL)
		goto out;

1005
	if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1006
		goto out;
L
Linus Torvalds 已提交
1007

1008 1009
	fl_owner = lockowner->l_owner;
	fl_pid = lockowner->l_pid;
1010
	spin_lock(&state->state_lock);
1011
	lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
1012
	if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1013
		nfs4_stateid_copy(dst, &lsp->ls_stateid);
1014 1015
		ret = true;
	}
1016
	spin_unlock(&state->state_lock);
L
Linus Torvalds 已提交
1017
	nfs4_put_lock_state(lsp);
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
out:
	return ret;
}

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

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

/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
 */
void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1037
		fmode_t fmode, const struct nfs_lockowner *lockowner)
1038 1039 1040
{
	if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
		return;
1041
	if (nfs4_copy_lock_stateid(dst, state, lockowner))
1042 1043
		return;
	nfs4_copy_open_stateid(dst, state);
L
Linus Torvalds 已提交
1044 1045
}

1046
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1047 1048 1049
{
	struct nfs_seqid *new;

1050
	new = kmalloc(sizeof(*new), gfp_mask);
1051 1052
	if (new != NULL) {
		new->sequence = counter;
1053
		INIT_LIST_HEAD(&new->list);
1054
		new->task = NULL;
1055 1056 1057 1058
	}
	return new;
}

1059
void nfs_release_seqid(struct nfs_seqid *seqid)
L
Linus Torvalds 已提交
1060
{
1061
	struct nfs_seqid_counter *sequence;
1062

1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
	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);
1074
	}
1075
	spin_unlock(&sequence->lock);
1076 1077 1078 1079 1080
}

void nfs_free_seqid(struct nfs_seqid *seqid)
{
	nfs_release_seqid(seqid);
1081
	kfree(seqid);
L
Linus Torvalds 已提交
1082 1083 1084
}

/*
1085 1086 1087 1088
 * 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()
 */
1089
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1090 1091 1092 1093 1094
{
	switch (status) {
		case 0:
			break;
		case -NFS4ERR_BAD_SEQID:
1095 1096
			if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
				return;
1097
			pr_warn_ratelimited("NFS: v4 server returned a bad"
D
Dan Muntz 已提交
1098 1099
					" sequence-id error on an"
					" unconfirmed sequence %p!\n",
1100
					seqid->sequence);
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
		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)
{
1119 1120 1121 1122 1123
	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
1124
		nfs4_drop_state_owner(sp);
1125 1126
	if (!nfs4_has_session(server->nfs_client))
		nfs_increment_seqid(status, seqid);
1127 1128 1129 1130 1131 1132 1133 1134 1135
}

/*
 * 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)
{
1136
	nfs_increment_seqid(status, seqid);
1137 1138 1139 1140
}

int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
{
1141
	struct nfs_seqid_counter *sequence = seqid->sequence;
1142 1143 1144
	int status = 0;

	spin_lock(&sequence->lock);
1145
	seqid->task = task;
1146 1147 1148 1149
	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;
1150
	rpc_sleep_on(&sequence->wait, task, NULL);
1151 1152
	status = -EAGAIN;
unlock:
1153 1154
	spin_unlock(&sequence->lock);
	return status;
L
Linus Torvalds 已提交
1155 1156
}

1157
static int nfs4_run_state_manager(void *);
L
Linus Torvalds 已提交
1158

1159
static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
T
Trond Myklebust 已提交
1160 1161
{
	smp_mb__before_clear_bit();
1162
	clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
T
Trond Myklebust 已提交
1163
	smp_mb__after_clear_bit();
1164
	wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
T
Trond Myklebust 已提交
1165 1166 1167
	rpc_wake_up(&clp->cl_rpcwaitq);
}

L
Linus Torvalds 已提交
1168
/*
1169
 * Schedule the nfs_client asynchronous state management routine
L
Linus Torvalds 已提交
1170
 */
1171
void nfs4_schedule_state_manager(struct nfs_client *clp)
L
Linus Torvalds 已提交
1172
{
1173
	struct task_struct *task;
1174
	char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
L
Linus Torvalds 已提交
1175

1176 1177
	if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
		return;
1178 1179
	__module_get(THIS_MODULE);
	atomic_inc(&clp->cl_count);
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195

	/* The rcu_read_lock() is not strictly necessary, as the state
	 * manager is the only thread that ever changes the rpc_xprt
	 * after it's initialized.  At this point, we're single threaded. */
	rcu_read_lock();
	snprintf(buf, sizeof(buf), "%s-manager",
			rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	rcu_read_unlock();
	task = kthread_run(nfs4_run_state_manager, clp, buf);
	if (IS_ERR(task)) {
		printk(KERN_ERR "%s: kthread_run: %ld\n",
			__func__, PTR_ERR(task));
		nfs4_clear_state_manager_bit(clp);
		nfs_put_client(clp);
		module_put(THIS_MODULE);
	}
L
Linus Torvalds 已提交
1196 1197 1198
}

/*
1199
 * Schedule a lease recovery attempt
L
Linus Torvalds 已提交
1200
 */
1201
void nfs4_schedule_lease_recovery(struct nfs_client *clp)
L
Linus Torvalds 已提交
1202 1203 1204
{
	if (!clp)
		return;
1205 1206
	if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1207 1208
	dprintk("%s: scheduling lease recovery for server %s\n", __func__,
			clp->cl_hostname);
1209
	nfs4_schedule_state_manager(clp);
L
Linus Torvalds 已提交
1210
}
A
Andy Adamson 已提交
1211
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
L
Linus Torvalds 已提交
1212

1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
int nfs4_wait_clnt_recover(struct nfs_client *clp)
{
	int res;

	might_sleep();

	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
			nfs_wait_bit_killable, TASK_KILLABLE);
	if (res)
		return res;

	if (clp->cl_cons_state < 0)
		return clp->cl_cons_state;
	return 0;
}

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;
}

1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
/*
 * 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);
1259 1260
	dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
			clp->cl_hostname);
1261 1262
}

1263 1264
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
{
1265
	nfs40_handle_cb_pathdown(clp);
1266 1267 1268
	nfs4_schedule_state_manager(clp);
}

1269
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1270 1271 1272 1273 1274 1275 1276 1277
{

	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;
	}
1278
	set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1279 1280 1281 1282
	set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
	return 1;
}

1283
static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1284 1285 1286
{
	set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
	clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1287
	set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1288 1289 1290 1291
	set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
	return 1;
}

1292 1293 1294 1295 1296
void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
{
	struct nfs_client *clp = server->nfs_client;

	nfs4_state_mark_reclaim_nograce(clp, state);
1297 1298
	dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
			clp->cl_hostname);
1299 1300
	nfs4_schedule_state_manager(clp);
}
A
Andy Adamson 已提交
1301
EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1302

1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
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;
1319
		if (!nfs4_stateid_match(&state->stateid, stateid))
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
			continue;
		nfs4_state_mark_reclaim_nograce(clp, state);
		found = true;
	}
	spin_unlock(&inode->i_lock);
	if (found)
		nfs4_schedule_state_manager(clp);
}


1330
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1331 1332
{
	struct inode *inode = state->inode;
1333
	struct nfs_inode *nfsi = NFS_I(inode);
L
Linus Torvalds 已提交
1334 1335 1336
	struct file_lock *fl;
	int status = 0;

1337 1338 1339 1340
	if (inode->i_flock == NULL)
		return 0;

	/* Guard against delegation returns and new lock/unlock calls */
1341
	down_write(&nfsi->rwsem);
1342
	/* Protect inode->i_flock using the BKL */
1343
	lock_flocks();
H
Harvey Harrison 已提交
1344
	for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1345
		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
L
Linus Torvalds 已提交
1346
			continue;
1347
		if (nfs_file_open_context(fl->fl_file)->state != state)
L
Linus Torvalds 已提交
1348
			continue;
1349
		unlock_flocks();
L
Linus Torvalds 已提交
1350 1351
		status = ops->recover_lock(state, fl);
		switch (status) {
1352 1353 1354 1355 1356 1357 1358 1359 1360
			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:
1361 1362 1363 1364
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1365
				goto out;
L
Linus Torvalds 已提交
1366
			default:
1367 1368
				printk(KERN_ERR "NFS: %s: unhandled error %d. "
					"Zeroing state\n", __func__, status);
1369 1370
			case -ENOMEM:
			case -NFS4ERR_DENIED:
L
Linus Torvalds 已提交
1371 1372
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1373
				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
1374
				status = 0;
L
Linus Torvalds 已提交
1375
		}
1376
		lock_flocks();
L
Linus Torvalds 已提交
1377
	}
1378
	unlock_flocks();
1379
out:
1380
	up_write(&nfsi->rwsem);
L
Linus Torvalds 已提交
1381 1382 1383
	return status;
}

1384
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
{
	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.
	 */
1398 1399
restart:
	spin_lock(&sp->so_lock);
L
Linus Torvalds 已提交
1400
	list_for_each_entry(state, &sp->so_states, open_states) {
1401 1402
		if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
			continue;
L
Linus Torvalds 已提交
1403 1404
		if (state->state == 0)
			continue;
1405 1406
		atomic_inc(&state->count);
		spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1407 1408
		status = ops->recover_open(sp, state);
		if (status >= 0) {
1409 1410
			status = nfs4_reclaim_locks(state, ops);
			if (status >= 0) {
1411
				spin_lock(&state->state_lock);
1412
				list_for_each_entry(lock, &state->lock_states, ls_locks) {
1413
					if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1414 1415
						pr_warn_ratelimited("NFS: "
							"%s: Lock reclaim "
1416
							"failed!\n", __func__);
1417
				}
1418
				spin_unlock(&state->state_lock);
1419 1420
				nfs4_put_open_state(state);
				goto restart;
L
Linus Torvalds 已提交
1421 1422 1423 1424
			}
		}
		switch (status) {
			default:
1425 1426
				printk(KERN_ERR "NFS: %s: unhandled error %d. "
					"Zeroing state\n", __func__, status);
L
Linus Torvalds 已提交
1427
			case -ENOENT:
1428
			case -ENOMEM:
1429
			case -ESTALE:
L
Linus Torvalds 已提交
1430 1431 1432 1433
				/*
				 * Open state on this file cannot be recovered
				 * All we can do is revert to using the zero stateid.
				 */
1434 1435
				memset(&state->stateid, 0,
					sizeof(state->stateid));
L
Linus Torvalds 已提交
1436 1437 1438
				/* Mark the file as being 'closed' */
				state->state = 0;
				break;
1439 1440 1441
			case -NFS4ERR_ADMIN_REVOKED:
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_BAD_STATEID:
1442 1443
			case -NFS4ERR_RECLAIM_BAD:
			case -NFS4ERR_RECLAIM_CONFLICT:
1444
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1445
				break;
L
Linus Torvalds 已提交
1446 1447
			case -NFS4ERR_EXPIRED:
			case -NFS4ERR_NO_GRACE:
1448
				nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
L
Linus Torvalds 已提交
1449
			case -NFS4ERR_STALE_CLIENTID:
1450 1451 1452 1453
			case -NFS4ERR_BADSESSION:
			case -NFS4ERR_BADSLOT:
			case -NFS4ERR_BAD_HIGH_SLOT:
			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
L
Linus Torvalds 已提交
1454 1455
				goto out_err;
		}
1456 1457
		nfs4_put_open_state(state);
		goto restart;
L
Linus Torvalds 已提交
1458
	}
1459
	spin_unlock(&sp->so_lock);
L
Linus Torvalds 已提交
1460 1461
	return 0;
out_err:
1462
	nfs4_put_open_state(state);
L
Linus Torvalds 已提交
1463 1464 1465
	return status;
}

1466 1467 1468 1469 1470 1471 1472 1473
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);
1474
	spin_lock(&state->state_lock);
1475 1476
	list_for_each_entry(lock, &state->lock_states, ls_locks) {
		lock->ls_seqid.flags = 0;
1477
		clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1478
	}
1479
	spin_unlock(&state->state_lock);
1480 1481
}

1482 1483
static void nfs4_reset_seqids(struct nfs_server *server,
	int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1484
{
1485
	struct nfs_client *clp = server->nfs_client;
1486
	struct nfs4_state_owner *sp;
1487
	struct rb_node *pos;
1488 1489
	struct nfs4_state *state;

1490 1491 1492 1493 1494
	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);
1495
		sp->so_seqid.flags = 0;
1496
		spin_lock(&sp->so_lock);
1497
		list_for_each_entry(state, &sp->so_states, open_states) {
1498 1499
			if (mark_reclaim(clp, state))
				nfs4_clear_open_state(state);
1500
		}
1501
		spin_unlock(&sp->so_lock);
1502
	}
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
	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();
1515 1516
}

1517 1518 1519 1520 1521 1522 1523
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);
}

1524 1525 1526 1527 1528 1529 1530 1531
static void nfs4_reclaim_complete(struct nfs_client *clp,
				 const struct nfs4_state_recovery_ops *ops)
{
	/* Notify the server we're done reclaiming our state */
	if (ops->reclaim_complete)
		(void)ops->reclaim_complete(clp);
}

1532
static void nfs4_clear_reclaim_server(struct nfs_server *server)
1533
{
1534
	struct nfs_client *clp = server->nfs_client;
1535 1536 1537 1538
	struct nfs4_state_owner *sp;
	struct rb_node *pos;
	struct nfs4_state *state;

1539 1540 1541 1542 1543
	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);
1544 1545
		spin_lock(&sp->so_lock);
		list_for_each_entry(state, &sp->so_states, open_states) {
1546 1547
			if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
						&state->flags))
1548 1549 1550 1551 1552
				continue;
			nfs4_state_mark_reclaim_nograce(clp, state);
		}
		spin_unlock(&sp->so_lock);
	}
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
	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();
1567 1568

	nfs_delegation_reap_unclaimed(clp);
1569 1570 1571 1572 1573 1574 1575 1576
	return 1;
}

static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
{
	if (!nfs4_state_clear_reclaim_reboot(clp))
		return;
	nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
}

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);
}

1591
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1592 1593
{
	switch (error) {
1594 1595
		case 0:
			break;
1596
		case -NFS4ERR_CB_PATH_DOWN:
1597
			nfs40_handle_cb_pathdown(clp);
1598
			break;
1599 1600
		case -NFS4ERR_NO_GRACE:
			nfs4_state_end_reclaim_reboot(clp);
1601
			break;
1602 1603 1604
		case -NFS4ERR_STALE_CLIENTID:
		case -NFS4ERR_LEASE_MOVED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1605
			nfs4_state_clear_reclaim_reboot(clp);
1606 1607 1608 1609 1610
			nfs4_state_start_reclaim_reboot(clp);
			break;
		case -NFS4ERR_EXPIRED:
			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
			nfs4_state_start_reclaim_nograce(clp);
1611
			break;
1612 1613 1614 1615 1616 1617
		case -NFS4ERR_BADSESSION:
		case -NFS4ERR_BADSLOT:
		case -NFS4ERR_BAD_HIGH_SLOT:
		case -NFS4ERR_DEADSESSION:
		case -NFS4ERR_SEQ_FALSE_RETRY:
		case -NFS4ERR_SEQ_MISORDERED:
1618
			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1619
			/* Zero session reset errors */
1620
			break;
1621 1622 1623
		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
			set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
			break;
1624
		default:
1625 1626
			dprintk("%s: failed to handle error %d for server %s\n",
					__func__, error, clp->cl_hostname);
1627
			return error;
1628
	}
1629 1630
	dprintk("%s: handled error %d for server %s\n", __func__, error,
			clp->cl_hostname);
1631
	return 0;
1632 1633
}

1634
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
L
Linus Torvalds 已提交
1635
{
1636 1637
	struct nfs4_state_owner *sp;
	struct nfs_server *server;
1638
	struct rb_node *pos;
L
Linus Torvalds 已提交
1639 1640
	int status = 0;

1641
restart:
1642 1643
	rcu_read_lock();
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1644
		nfs4_purge_state_owners(server);
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
		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);
			}

1665
			nfs4_put_state_owner(sp);
1666
			goto restart;
1667
		}
1668
		spin_unlock(&clp->cl_lock);
1669
	}
1670
	rcu_read_unlock();
1671 1672 1673 1674 1675 1676
	return status;
}

static int nfs4_check_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
1677 1678
	const struct nfs4_state_maintenance_ops *ops =
		clp->cl_mvops->state_renewal_ops;
1679
	int status;
L
Linus Torvalds 已提交
1680

1681 1682 1683
	/* Is the client already known to have an expired lease? */
	if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
		return 0;
1684 1685 1686
	spin_lock(&clp->cl_lock);
	cred = ops->get_state_renewal_cred_locked(clp);
	spin_unlock(&clp->cl_lock);
1687 1688
	if (cred == NULL) {
		cred = nfs4_get_setclientid_cred(clp);
1689
		status = -ENOKEY;
1690 1691
		if (cred == NULL)
			goto out;
1692
	}
1693
	status = ops->renew_lease(clp, cred);
1694 1695
	put_rpccred(cred);
out:
1696
	return nfs4_recovery_handle_error(clp, status);
1697 1698
}

1699 1700
/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
 * and for recoverable errors on EXCHANGE_ID for v4.1
1701 1702 1703 1704
 */
static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
{
	switch (status) {
1705 1706 1707 1708 1709
	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);
1710 1711
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
		break;
1712 1713
	case -NFS4ERR_STALE_CLIENTID:
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1714 1715
		nfs4_state_clear_reclaim_reboot(clp);
		nfs4_state_start_reclaim_reboot(clp);
1716
		break;
1717 1718 1719 1720 1721 1722
	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;
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
	case -EACCES:
		if (clp->cl_machine_cred == NULL)
			return -EACCES;
		/* Handle case where the user hasn't set up machine creds */
		nfs4_clear_machine_cred(clp);
	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);
1737 1738
		dprintk("%s: exit with error %d for server %s\n",
				__func__, -EPROTONOSUPPORT, clp->cl_hostname);
1739 1740 1741 1742
		return -EPROTONOSUPPORT;
	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
				 * in nfs4_exchange_id */
	default:
1743 1744
		dprintk("%s: exit with error %d for server %s\n", __func__,
				status, clp->cl_hostname);
1745 1746 1747
		return status;
	}
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1748 1749
	dprintk("%s: handled error %d for server %s\n", __func__, status,
			clp->cl_hostname);
1750 1751 1752
	return 0;
}

1753
static int nfs4_establish_lease(struct nfs_client *clp)
1754 1755
{
	struct rpc_cred *cred;
1756 1757
	const struct nfs4_state_recovery_ops *ops =
		clp->cl_mvops->reboot_recovery_ops;
1758
	int status;
1759

1760
	cred = ops->get_clid_cred(clp);
1761 1762 1763 1764 1765
	if (cred == NULL)
		return -ENOENT;
	status = ops->establish_clid(clp, cred);
	put_rpccred(cred);
	if (status != 0)
1766 1767 1768 1769 1770
		return status;
	pnfs_destroy_all_layouts(clp);
	return 0;
}

1771 1772 1773 1774
/*
 * Returns zero or a negative errno.  NFS4ERR values are converted
 * to local errno values.
 */
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796
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)
1797
		return nfs4_handle_reclaim_lease_error(clp, status);
1798 1799 1800
	clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
	nfs4_state_start_reclaim_nograce(clp);
1801
	return 0;
1802 1803
}

1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
/**
 * 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;
	rpc_authflavor_t *flavors, flav, save;
	struct rpc_clnt *clnt;
	struct rpc_cred *cred;
	int i, len, status;

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

	len = NFS_MAX_SECFLAVORS;
	flavors = kcalloc(len, sizeof(*flavors), GFP_KERNEL);
	if (flavors == NULL) {
		status = -ENOMEM;
		goto out;
	}
	len = rpcauth_list_flavors(flavors, len);
	if (len < 0) {
		status = len;
		goto out_free;
	}
	clnt = clp->cl_rpcclient;
	save = clnt->cl_auth->au_flavor;
	i = 0;

	mutex_lock(&nfs_clid_init_mutex);
	status  = -ENOENT;
again:
	cred = ops->get_clid_cred(clp);
	if (cred == NULL)
		goto out_unlock;

	status = ops->detect_trunking(clp, result, cred);
	put_rpccred(cred);
	switch (status) {
	case 0:
		break;

	case -EACCES:
		if (clp->cl_machine_cred == NULL)
			break;
		/* Handle case where the user hasn't set up machine creds */
		nfs4_clear_machine_cred(clp);
	case -NFS4ERR_DELAY:
	case -ETIMEDOUT:
	case -EAGAIN:
		ssleep(1);
		dprintk("NFS: %s after status %d, retrying\n",
			__func__, status);
		goto again;

	case -NFS4ERR_CLID_INUSE:
	case -NFS4ERR_WRONGSEC:
		status = -EPERM;
		if (i >= len)
			break;

		flav = flavors[i++];
		if (flav == save)
			flav = flavors[i++];
		clnt = rpc_clone_client_set_auth(clnt, flav);
		if (IS_ERR(clnt)) {
			status = PTR_ERR(clnt);
			break;
		}
		clp->cl_rpcclient = clnt;
		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;
	}

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

1906
#ifdef CONFIG_NFS_V4_1
1907
void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
1908
{
1909 1910
	struct nfs_client *clp = session->clp;

1911 1912 1913 1914 1915 1916 1917
	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);
	}
1918
	nfs4_schedule_lease_recovery(clp);
1919
}
1920
EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1921

1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
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);
}

1934 1935 1936 1937 1938
void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp)
{
	nfs41_ping_server(clp);
}

1939 1940 1941
static void nfs4_reset_all_state(struct nfs_client *clp)
{
	if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1942
		set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1943
		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1944
		nfs4_state_start_reclaim_nograce(clp);
1945 1946
		dprintk("%s: scheduling reset of all state for server %s!\n",
				__func__, clp->cl_hostname);
1947
		nfs4_schedule_state_manager(clp);
1948 1949 1950 1951 1952 1953 1954
	}
}

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);
1955 1956
		dprintk("%s: server %s rebooted!\n", __func__,
				clp->cl_hostname);
1957
		nfs4_schedule_state_manager(clp);
1958 1959 1960 1961 1962 1963
	}
}

static void nfs41_handle_state_revoked(struct nfs_client *clp)
{
	nfs4_reset_all_state(clp);
1964
	dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
1965 1966 1967 1968 1969 1970
}

static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
{
	/* This will need to handle layouts too */
	nfs_expire_all_delegations(clp);
1971 1972
	dprintk("%s: Recallable state revoked on server %s!\n", __func__,
			clp->cl_hostname);
1973 1974
}

1975
static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
1976 1977 1978
{
	nfs_expire_all_delegations(clp);
	if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1979
		nfs4_schedule_state_manager(clp);
1980 1981
	dprintk("%s: server %s declared a backchannel fault\n", __func__,
			clp->cl_hostname);
1982 1983
}

1984 1985 1986 1987 1988 1989 1990
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);
}

1991 1992 1993 1994
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
{
	if (!flags)
		return;
1995 1996 1997 1998

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

1999
	if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2000
		nfs41_handle_server_reboot(clp);
2001
	if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
2002 2003
			    SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
			    SEQ4_STATUS_ADMIN_STATE_REVOKED |
2004 2005
			    SEQ4_STATUS_LEASE_MOVED))
		nfs41_handle_state_revoked(clp);
2006
	if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2007
		nfs41_handle_recallable_state_revoked(clp);
2008 2009 2010 2011
	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))
2012
		nfs41_handle_cb_path_down(clp);
2013 2014
}

2015 2016
static int nfs4_reset_session(struct nfs_client *clp)
{
2017
	struct rpc_cred *cred;
2018 2019
	int status;

2020 2021
	if (!nfs4_has_session(clp))
		return 0;
2022
	nfs4_begin_drain_session(clp);
2023 2024
	cred = nfs4_get_exchange_id_cred(clp);
	status = nfs4_proc_destroy_session(clp->cl_session, cred);
2025 2026
	if (status && status != -NFS4ERR_BADSESSION &&
	    status != -NFS4ERR_DEADSESSION) {
2027
		status = nfs4_recovery_handle_error(clp, status);
2028 2029 2030 2031
		goto out;
	}

	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2032
	status = nfs4_proc_create_session(clp, cred);
2033
	if (status) {
2034 2035
		dprintk("%s: session reset failed with status %d for server %s!\n",
			__func__, status, clp->cl_hostname);
2036
		status = nfs4_handle_reclaim_lease_error(clp, status);
2037 2038
		goto out;
	}
2039
	nfs41_finish_session_reset(clp);
2040 2041
	dprintk("%s: session reset was successful for server %s!\n",
			__func__, clp->cl_hostname);
2042
out:
2043 2044
	if (cred)
		put_rpccred(cred);
2045 2046
	return status;
}
2047

2048 2049
static int nfs4_bind_conn_to_session(struct nfs_client *clp)
{
2050 2051 2052
	struct rpc_cred *cred;
	int ret;

2053 2054
	if (!nfs4_has_session(clp))
		return 0;
2055
	nfs4_begin_drain_session(clp);
2056 2057 2058 2059
	cred = nfs4_get_exchange_id_cred(clp);
	ret = nfs4_proc_bind_conn_to_session(clp, cred);
	if (cred)
		put_rpccred(cred);
2060
	clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2061 2062
	switch (ret) {
	case 0:
2063 2064
		dprintk("%s: bind_conn_to_session was successful for server %s!\n",
			__func__, clp->cl_hostname);
2065 2066 2067 2068 2069 2070 2071 2072 2073
		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;
2074
}
2075
#else /* CONFIG_NFS_V4_1 */
2076
static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2077
static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
2078 2079 2080 2081 2082

static int nfs4_bind_conn_to_session(struct nfs_client *clp)
{
	return 0;
}
2083 2084
#endif /* CONFIG_NFS_V4_1 */

2085
static void nfs4_state_manager(struct nfs_client *clp)
2086 2087
{
	int status = 0;
2088
	const char *section = "", *section_sep = "";
2089 2090

	/* Ensure exclusive access to NFSv4 state */
2091
	do {
2092
		if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2093
			section = "purge state";
2094
			status = nfs4_purge_lease(clp);
2095 2096
			if (status < 0)
				goto out_error;
2097
			continue;
2098 2099
		}

2100
		if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2101
			section = "lease expired";
2102 2103
			/* We're going to have to re-establish a clientid */
			status = nfs4_reclaim_lease(clp);
2104
			if (status < 0)
2105
				goto out_error;
2106
			continue;
2107 2108
		}

2109
		/* Initialize or reset the session */
2110
		if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2111
			section = "reset session";
2112
			status = nfs4_reset_session(clp);
2113 2114 2115
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
				continue;
			if (status < 0)
2116 2117
				goto out_error;
		}
2118

2119 2120
		/* Send BIND_CONN_TO_SESSION */
		if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2121
				&clp->cl_state)) {
2122
			section = "bind conn to session";
2123 2124 2125
			status = nfs4_bind_conn_to_session(clp);
			if (status < 0)
				goto out_error;
2126
			continue;
2127 2128
		}

2129 2130 2131 2132 2133 2134 2135 2136
		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;
			continue;
		}

2137
		/* First recover reboot state... */
2138
		if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2139
			section = "reclaim reboot";
2140
			status = nfs4_do_reclaim(clp,
2141
				clp->cl_mvops->reboot_recovery_ops);
2142
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2143
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2144
				continue;
2145
			nfs4_state_end_reclaim_reboot(clp);
2146 2147 2148 2149
			if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
				continue;
			if (status < 0)
				goto out_error;
2150 2151
		}

2152 2153
		/* Now recover expired state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2154
			section = "reclaim nograce";
2155
			status = nfs4_do_reclaim(clp,
2156
				clp->cl_mvops->nograce_recovery_ops);
2157
			if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2158
			    test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2159 2160 2161
			    test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
				continue;
			if (status < 0)
2162
				goto out_error;
L
Linus Torvalds 已提交
2163
		}
2164

2165
		nfs4_end_drain_session(clp);
2166 2167 2168 2169
		if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
			nfs_client_return_marked_delegations(clp);
			continue;
		}
2170 2171

		nfs4_clear_state_manager_bit(clp);
2172 2173 2174 2175 2176
		/* 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;
2177
	} while (atomic_read(&clp->cl_count) > 1);
2178
	return;
L
Linus Torvalds 已提交
2179
out_error:
2180 2181 2182 2183 2184
	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);
2185
	ssleep(1);
2186
	nfs4_end_drain_session(clp);
2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198
	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
2199 2200 2201 2202 2203 2204 2205
}

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