client.c 40.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14
/* client.c: NFS client sharing and management code
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


#include <linux/module.h>
#include <linux/init.h>
A
Alexey Dobriyan 已提交
15
#include <linux/sched.h>
16 17 18 19 20 21 22 23 24 25
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
26
#include <linux/sunrpc/xprtsock.h>
\
\"Talpey, Thomas\ 已提交
27
#include <linux/sunrpc/xprtrdma.h>
28 29 30 31 32 33 34 35 36
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
37 38
#include <linux/in6.h>
#include <net/ipv6.h>
39 40 41 42 43 44 45 46 47
#include <linux/nfs_xdr.h>

#include <asm/system.h>

#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
48
#include "fscache.h"
49 50 51 52 53

#define NFSDBG_FACILITY		NFSDBG_CLIENT

static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
54
static LIST_HEAD(nfs_volume_list);
55 56
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);

57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
/*
 * RPC cruft for NFS
 */
static struct rpc_version *nfs_version[5] = {
	[2]			= &nfs_version2,
#ifdef CONFIG_NFS_V3
	[3]			= &nfs_version3,
#endif
#ifdef CONFIG_NFS_V4
	[4]			= &nfs_version4,
#endif
};

struct rpc_program nfs_program = {
	.name			= "nfs",
	.number			= NFS_PROGRAM,
	.nrvers			= ARRAY_SIZE(nfs_version),
	.version		= nfs_version,
	.stats			= &nfs_rpcstat,
	.pipe_dir_name		= "/nfs",
};

struct rpc_stat nfs_rpcstat = {
	.program		= &nfs_program
};


#ifdef CONFIG_NFS_V3_ACL
static struct rpc_stat		nfsacl_rpcstat = { &nfsacl_program };
static struct rpc_version *	nfsacl_version[] = {
	[3]			= &nfsacl_version3,
};

struct rpc_program		nfsacl_program = {
	.name			= "nfsacl",
	.number			= NFS_ACL_PROGRAM,
	.nrvers			= ARRAY_SIZE(nfsacl_version),
	.version		= nfsacl_version,
	.stats			= &nfsacl_rpcstat,
};
#endif  /* CONFIG_NFS_V3_ACL */

99 100
struct nfs_client_initdata {
	const char *hostname;
101
	const struct sockaddr *addr;
102
	size_t addrlen;
103
	const struct nfs_rpc_ops *rpc_ops;
104
	int proto;
105 106
};

107 108 109 110 111 112
/*
 * Allocate a shared client record
 *
 * Since these are allocated/deallocated very rarely, we don't
 * bother putting them in a slab cache...
 */
113
static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
114 115
{
	struct nfs_client *clp;
116
	struct rpc_cred *cred;
117 118 119 120

	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
		goto error_0;

121 122 123
	clp->rpc_ops = cl_init->rpc_ops;

	if (cl_init->rpc_ops->version == 4) {
124 125 126 127 128 129 130 131
		if (nfs_callback_up() < 0)
			goto error_2;
		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
	}

	atomic_set(&clp->cl_count, 1);
	clp->cl_cons_state = NFS_CS_INITING;

132 133
	memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
	clp->cl_addrlen = cl_init->addrlen;
134

135 136
	if (cl_init->hostname) {
		clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
137 138 139 140 141 142 143
		if (!clp->cl_hostname)
			goto error_3;
	}

	INIT_LIST_HEAD(&clp->cl_superblocks);
	clp->cl_rpcclient = ERR_PTR(-EINVAL);

144 145
	clp->cl_proto = cl_init->proto;

146 147 148
#ifdef CONFIG_NFS_V4
	INIT_LIST_HEAD(&clp->cl_delegations);
	spin_lock_init(&clp->cl_lock);
149
	INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
150 151 152 153
	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
	clp->cl_boot_time = CURRENT_TIME;
	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
#endif
154 155 156
	cred = rpc_lookup_machine_cred();
	if (!IS_ERR(cred))
		clp->cl_machine_cred = cred;
157

158 159
	nfs_fscache_get_client_cookie(clp);

160 161 162
	return clp;

error_3:
T
Trond Myklebust 已提交
163 164
	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
		nfs_callback_down();
165 166 167 168 169 170
error_2:
	kfree(clp);
error_0:
	return NULL;
}

171 172 173 174 175
static void nfs4_shutdown_client(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4
	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
		nfs4_kill_renewd(clp);
176
	BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
177 178
	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
		nfs_idmap_delete(clp);
179 180

	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
181 182 183
#endif
}

184 185 186 187 188
/*
 * Destroy a shared client record
 */
static void nfs_free_client(struct nfs_client *clp)
{
189
	dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
190

191
	nfs4_shutdown_client(clp);
192

193 194
	nfs_fscache_release_client_cookie(clp);

195 196 197 198 199 200 201
	/* -EIO all pending I/O */
	if (!IS_ERR(clp->cl_rpcclient))
		rpc_shutdown_client(clp->cl_rpcclient);

	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
		nfs_callback_down();

202 203 204
	if (clp->cl_machine_cred != NULL)
		put_rpccred(clp->cl_machine_cred);

205 206 207 208 209 210 211 212 213 214 215
	kfree(clp->cl_hostname);
	kfree(clp);

	dprintk("<-- nfs_free_client()\n");
}

/*
 * Release a reference to a shared client record
 */
void nfs_put_client(struct nfs_client *clp)
{
D
David Howells 已提交
216 217 218
	if (!clp)
		return;

219 220 221 222 223 224 225 226 227 228 229 230
	dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));

	if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
		list_del(&clp->cl_share_link);
		spin_unlock(&nfs_client_lock);

		BUG_ON(!list_empty(&clp->cl_superblocks));

		nfs_free_client(clp);
	}
}

231
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
232 233 234 235 236 237 238 239 240 241 242
/*
 * Test if two ip6 socket addresses refer to the same socket by
 * comparing relevant fields. The padding bytes specifically, are not
 * compared. sin6_flowinfo is not compared because it only affects QoS
 * and sin6_scope_id is only compared if the address is "link local"
 * because "link local" addresses need only be unique to a specific
 * link. Conversely, ordinary unicast addresses might have different
 * sin6_scope_id.
 *
 * The caller should ensure both socket addresses are AF_INET6.
 */
243 244
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
245
{
246 247
	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
248

249 250
	if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
	    sin1->sin6_scope_id != sin2->sin6_scope_id)
251
		return 0;
252

253
	return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
254
}
255 256 257
#else	/* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
258 259 260
{
	return 0;
}
261
#endif
262

I
Ian Dall 已提交
263 264 265 266 267 268 269
/*
 * Test if two ip4 socket addresses refer to the same socket, by
 * comparing relevant fields. The padding bytes specifically, are
 * not compared.
 *
 * The caller should ensure both socket addresses are AF_INET.
 */
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
{
	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;

	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}

static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
				const struct sockaddr *sa2)
{
	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;

	return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
		(sin1->sin6_port == sin2->sin6_port);
}

289 290
static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
				const struct sockaddr *sa2)
I
Ian Dall 已提交
291
{
292 293
	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
294

295 296 297 298 299 300 301 302 303 304 305 306
	return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
		(sin1->sin_port == sin2->sin_port);
}

/*
 * Test if two socket addresses represent the same actual socket,
 * by comparing (only) relevant fields, excluding the port number.
 */
static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
				     const struct sockaddr *sa2)
{
	if (sa1->sa_family != sa2->sa_family)
I
Ian Dall 已提交
307
		return 0;
308 309 310 311 312 313 314 315

	switch (sa1->sa_family) {
	case AF_INET:
		return nfs_sockaddr_match_ipaddr4(sa1, sa2);
	case AF_INET6:
		return nfs_sockaddr_match_ipaddr6(sa1, sa2);
	}
	return 0;
I
Ian Dall 已提交
316 317 318 319
}

/*
 * Test if two socket addresses represent the same actual socket,
320
 * by comparing (only) relevant fields, including the port number.
I
Ian Dall 已提交
321 322 323 324 325 326 327 328 329
 */
static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
			    const struct sockaddr *sa2)
{
	if (sa1->sa_family != sa2->sa_family)
		return 0;

	switch (sa1->sa_family) {
	case AF_INET:
330
		return nfs_sockaddr_cmp_ip4(sa1, sa2);
I
Ian Dall 已提交
331
	case AF_INET6:
332
		return nfs_sockaddr_cmp_ip6(sa1, sa2);
I
Ian Dall 已提交
333 334 335 336
	}
	return 0;
}

337
/*
338 339
 * Find a client by IP address and protocol version
 * - returns NULL if no such client
340
 */
341
struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
342 343 344
{
	struct nfs_client *clp;

345
	spin_lock(&nfs_client_lock);
346
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
347 348
		struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

349
		/* Don't match clients that failed to initialise properly */
350
		if (clp->cl_cons_state != NFS_CS_READY)
351 352
			continue;

353
		/* Different NFS versions cannot share the same nfs_client */
354
		if (clp->rpc_ops->version != nfsversion)
355 356
			continue;

357
		/* Match only the IP address, not the port number */
358
		if (!nfs_sockaddr_match_ipaddr(addr, clap))
359 360
			continue;

361 362 363
		atomic_inc(&clp->cl_count);
		spin_unlock(&nfs_client_lock);
		return clp;
364
	}
365
	spin_unlock(&nfs_client_lock);
366 367 368
	return NULL;
}

369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401
/*
 * Find a client by IP address and protocol version
 * - returns NULL if no such client
 */
struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
{
	struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
	u32 nfsvers = clp->rpc_ops->version;

	spin_lock(&nfs_client_lock);
	list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
		struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

		/* Don't match clients that failed to initialise properly */
		if (clp->cl_cons_state != NFS_CS_READY)
			continue;

		/* Different NFS versions cannot share the same nfs_client */
		if (clp->rpc_ops->version != nfsvers)
			continue;

		/* Match only the IP address, not the port number */
		if (!nfs_sockaddr_match_ipaddr(sap, clap))
			continue;

		atomic_inc(&clp->cl_count);
		spin_unlock(&nfs_client_lock);
		return clp;
	}
	spin_unlock(&nfs_client_lock);
	return NULL;
}

402
/*
403 404
 * Find an nfs_client on the list that matches the initialisation data
 * that is supplied.
405
 */
406
static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
407 408
{
	struct nfs_client *clp;
I
Ian Dall 已提交
409
	const struct sockaddr *sap = data->addr;
410

411
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
I
Ian Dall 已提交
412
	        const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
413 414 415 416 417
		/* Don't match clients that failed to initialise properly */
		if (clp->cl_cons_state < 0)
			continue;

		/* Different NFS versions cannot share the same nfs_client */
418
		if (clp->rpc_ops != data->rpc_ops)
419 420
			continue;

421 422 423
		if (clp->cl_proto != data->proto)
			continue;

424
		/* Match the full socket address */
I
Ian Dall 已提交
425
		if (!nfs_sockaddr_cmp(sap, clap))
426 427 428 429
			continue;

		atomic_inc(&clp->cl_count);
		return clp;
430
	}
431
	return NULL;
432 433 434 435 436 437
}

/*
 * Look up a client by IP address and protocol version
 * - creates a new record if one doesn't yet exist
 */
438
static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
439 440 441 442
{
	struct nfs_client *clp, *new = NULL;
	int error;

443 444
	dprintk("--> nfs_get_client(%s,v%u)\n",
		cl_init->hostname ?: "", cl_init->rpc_ops->version);
445 446 447 448 449

	/* see if the client already exists */
	do {
		spin_lock(&nfs_client_lock);

450
		clp = nfs_match_client(cl_init);
451 452 453 454 455 456 457
		if (clp)
			goto found_client;
		if (new)
			goto install_client;

		spin_unlock(&nfs_client_lock);

458
		new = nfs_alloc_client(cl_init);
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
	} while (new);

	return ERR_PTR(-ENOMEM);

	/* install a new client and return with it unready */
install_client:
	clp = new;
	list_add(&clp->cl_share_link, &nfs_client_list);
	spin_unlock(&nfs_client_lock);
	dprintk("--> nfs_get_client() = %p [new]\n", clp);
	return clp;

	/* found an existing client
	 * - make sure it's ready before returning
	 */
found_client:
	spin_unlock(&nfs_client_lock);

	if (new)
		nfs_free_client(new);

480
	error = wait_event_killable(nfs_client_active_wq,
481 482 483 484
				clp->cl_cons_state != NFS_CS_INITING);
	if (error < 0) {
		nfs_put_client(clp);
		return ERR_PTR(-ERESTARTSYS);
485 486 487 488 489 490 491 492
	}

	if (clp->cl_cons_state < NFS_CS_READY) {
		error = clp->cl_cons_state;
		nfs_put_client(clp);
		return ERR_PTR(error);
	}

493 494
	BUG_ON(clp->cl_cons_state != NFS_CS_READY);

495 496 497 498 499 500 501
	dprintk("--> nfs_get_client() = %p [share]\n", clp);
	return clp;
}

/*
 * Mark a server as ready or failed
 */
502
static void nfs_mark_client_ready(struct nfs_client *clp, int state)
503 504 505 506
{
	clp->cl_cons_state = state;
	wake_up_all(&nfs_client_active_wq);
}
507 508 509 510 511 512 513 514 515 516 517

/*
 * Initialise the timeout values for a connection
 */
static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
				    unsigned int timeo, unsigned int retrans)
{
	to->to_initval = timeo * HZ / 10;
	to->to_retries = retrans;

	switch (proto) {
518
	case XPRT_TRANSPORT_TCP:
\
\"Talpey, Thomas\ 已提交
519
	case XPRT_TRANSPORT_RDMA:
520 521
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_TCP_RETRANS;
522
		if (to->to_initval == 0)
523
			to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
524 525 526 527
		if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
			to->to_initval = NFS_MAX_TCP_TIMEOUT;
		to->to_increment = to->to_initval;
		to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
528 529 530 531
		if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
			to->to_maxval = NFS_MAX_TCP_TIMEOUT;
		if (to->to_maxval < to->to_initval)
			to->to_maxval = to->to_initval;
532 533
		to->to_exponential = 0;
		break;
534
	case XPRT_TRANSPORT_UDP:
535 536
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
537
		if (!to->to_initval)
538
			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
539 540 541 542 543
		if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
			to->to_initval = NFS_MAX_UDP_TIMEOUT;
		to->to_maxval = NFS_MAX_UDP_TIMEOUT;
		to->to_exponential = 1;
		break;
544 545
	default:
		BUG();
546 547 548 549 550 551
	}
}

/*
 * Create an RPC client handle
 */
552
static int nfs_create_rpc_client(struct nfs_client *clp,
553 554
				 const struct rpc_timeout *timeparms,
				 rpc_authflavor_t flavor,
555
				 int discrtry, int noresvport)
556 557
{
	struct rpc_clnt		*clnt = NULL;
558
	struct rpc_create_args args = {
559
		.protocol	= clp->cl_proto,
560
		.address	= (struct sockaddr *)&clp->cl_addr,
561
		.addrsize	= clp->cl_addrlen,
562
		.timeout	= timeparms,
563 564 565 566 567
		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
568

569 570 571 572 573
	if (discrtry)
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
	if (noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

574 575 576
	if (!IS_ERR(clp->cl_rpcclient))
		return 0;

577
	clnt = rpc_create(&args);
578 579
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
580
				__func__, PTR_ERR(clnt));
581 582 583 584 585 586
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
587 588 589 590 591 592 593

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
	if (!(server->flags & NFS_MOUNT_NONLM))
594
		nlmclnt_done(server->nlm_host);
595 596 597 598 599 600 601
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
602 603
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
604 605 606 607 608 609 610
	struct nlmclnt_initdata nlm_init = {
		.hostname	= clp->cl_hostname,
		.address	= (struct sockaddr *)&clp->cl_addr,
		.addrlen	= clp->cl_addrlen,
		.protocol	= server->flags & NFS_MOUNT_TCP ?
						IPPROTO_TCP : IPPROTO_UDP,
		.nfs_version	= clp->rpc_ops->version,
611 612
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
613
	};
614

615
	if (nlm_init.nfs_version > 3)
616
		return 0;
617
	if (server->flags & NFS_MOUNT_NONLM)
618 619
		return 0;

620
	host = nlmclnt_init(&nlm_init);
621 622 623 624 625 626
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
627 628 629 630 631 632 633 634
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
635
	if (server->nfs_client->rpc_ops->version != 3)
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661
		goto out_noacl;
	if (server->flags & NFS_MOUNT_NOACL)
		goto out_noacl;

	server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
	if (IS_ERR(server->client_acl))
		goto out_noacl;

	/* No errors! Assume that Sun nfsacls are supported */
	server->caps |= NFS_CAP_ACLS;
	return;

out_noacl:
	server->caps &= ~NFS_CAP_ACLS;
}
#else
static inline void nfs_init_server_aclclient(struct nfs_server *server)
{
	server->flags &= ~NFS_MOUNT_NOACL;
	server->caps &= ~NFS_CAP_ACLS;
}
#endif

/*
 * Create a general RPC client
 */
662 663 664
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
665 666 667 668 669
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
670
		dprintk("%s: couldn't create rpc_client!\n", __func__);
671 672 673
		return PTR_ERR(server->client);
	}

674 675 676 677 678
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

679 680 681 682 683
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
684
			dprintk("%s: couldn't create credcache!\n", __func__);
685 686 687 688 689 690 691 692 693 694 695 696 697
			return PTR_ERR(auth);
		}
	}
	server->client->cl_softrtry = 0;
	if (server->flags & NFS_MOUNT_SOFT)
		server->client->cl_softrtry = 1;

	return 0;
}

/*
 * Initialise an NFS2 or NFS3 client
 */
698
static int nfs_init_client(struct nfs_client *clp,
699
			   const struct rpc_timeout *timeparms,
700
			   const struct nfs_parsed_mount_data *data)
701 702 703 704 705 706 707 708 709 710 711 712 713
{
	int error;

	if (clp->cl_cons_state == NFS_CS_READY) {
		/* the client is already initialised */
		dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
		return 0;
	}

	/*
	 * Create a client RPC handle for doing FSSTAT with UNIX auth only
	 * - RFC 2623, sec 2.3.2
	 */
C
Chuck Lever 已提交
714 715
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
				      0, data->flags & NFS_MOUNT_NORESVPORT);
716 717 718 719 720 721 722 723 724 725 726 727 728 729
	if (error < 0)
		goto error;
	nfs_mark_client_ready(clp, NFS_CS_READY);
	return 0;

error:
	nfs_mark_client_ready(clp, error);
	dprintk("<-- nfs_init_client() = xerror %d\n", error);
	return error;
}

/*
 * Create a version 2 or 3 client
 */
730 731
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
732
{
733 734
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
735
		.addr = (const struct sockaddr *)&data->nfs_server.address,
736
		.addrlen = data->nfs_server.addrlen,
737
		.rpc_ops = &nfs_v2_clientops,
738
		.proto = data->nfs_server.protocol,
739
	};
740
	struct rpc_timeout timeparms;
741
	struct nfs_client *clp;
742
	int error;
743 744 745 746 747

	dprintk("--> nfs_init_server()\n");

#ifdef CONFIG_NFS_V3
	if (data->flags & NFS_MOUNT_VER3)
748
		cl_init.rpc_ops = &nfs_v3_clientops;
749 750 751
#endif

	/* Allocate or find a client reference we can use */
752
	clp = nfs_get_client(&cl_init);
753 754 755 756 757
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

758 759 760
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
	error = nfs_init_client(clp, &timeparms, data);
761 762 763 764 765 766
	if (error < 0)
		goto error;

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
767
	server->flags = data->flags;
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783

	if (data->rsize)
		server->rsize = nfs_block_size(data->rsize, NULL);
	if (data->wsize)
		server->wsize = nfs_block_size(data->wsize, NULL);

	server->acregmin = data->acregmin * HZ;
	server->acregmax = data->acregmax * HZ;
	server->acdirmin = data->acdirmin * HZ;
	server->acdirmax = data->acdirmax * HZ;

	/* Start lockd here, before we might error out */
	error = nfs_start_lockd(server);
	if (error < 0)
		goto error;

784 785
	server->port = data->nfs_server.port;

786
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
787 788 789
	if (error < 0)
		goto error;

790 791 792 793 794 795 796 797 798 799
	/* Preserve the values of mount_server-related mount options */
	if (data->mount_server.addrlen) {
		memcpy(&server->mountd_address, &data->mount_server.address,
			data->mount_server.addrlen);
		server->mountd_addrlen = data->mount_server.addrlen;
	}
	server->mountd_version = data->mount_server.version;
	server->mountd_port = data->mount_server.port;
	server->mountd_protocol = data->mount_server.protocol;

800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
	server->namelen  = data->namlen;
	/* Create a client RPC handle for the NFSv3 ACL management interface */
	nfs_init_server_aclclient(server);
	dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
	return 0;

error:
	server->nfs_client = NULL;
	nfs_put_client(clp);
	dprintk("<-- nfs_init_server() = xerror %d\n", error);
	return error;
}

/*
 * Load up the server record from information gained in an fsinfo record
 */
static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
{
	unsigned long max_rpc_payload;

	/* Work out a lot of parameters */
	if (server->rsize == 0)
		server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
	if (server->wsize == 0)
		server->wsize = nfs_block_size(fsinfo->wtpref, NULL);

	if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
		server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
	if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
		server->wsize = nfs_block_size(fsinfo->wtmax, NULL);

	max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
	if (server->rsize > max_rpc_payload)
		server->rsize = max_rpc_payload;
	if (server->rsize > NFS_MAX_FILE_IO_SIZE)
		server->rsize = NFS_MAX_FILE_IO_SIZE;
	server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
P
Peter Zijlstra 已提交
837

838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
	server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;

	if (server->wsize > max_rpc_payload)
		server->wsize = max_rpc_payload;
	if (server->wsize > NFS_MAX_FILE_IO_SIZE)
		server->wsize = NFS_MAX_FILE_IO_SIZE;
	server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
	if (server->dtsize > PAGE_CACHE_SIZE)
		server->dtsize = PAGE_CACHE_SIZE;
	if (server->dtsize > server->rsize)
		server->dtsize = server->rsize;

	if (server->flags & NFS_MOUNT_NOAC) {
		server->acregmin = server->acregmax = 0;
		server->acdirmin = server->acdirmax = 0;
	}

	server->maxfilesize = fsinfo->maxfilesize;

	/* We're airborne Set socket buffersize */
	rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
}

/*
 * Probe filesystem information, including the FSID on v2/v3
 */
static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
{
	struct nfs_fsinfo fsinfo;
	struct nfs_client *clp = server->nfs_client;
	int error;

	dprintk("--> nfs_probe_fsinfo()\n");

	if (clp->rpc_ops->set_capabilities != NULL) {
		error = clp->rpc_ops->set_capabilities(server, mntfh);
		if (error < 0)
			goto out_error;
	}

	fsinfo.fattr = fattr;
	nfs_fattr_init(fattr);
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

	nfs_server_set_fsinfo(server, &fsinfo);
P
Peter Zijlstra 已提交
888 889 890 891
	error = bdi_init(&server->backing_dev_info);
	if (error)
		goto out_error;

892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941

	/* Get some general file system info */
	if (server->namelen == 0) {
		struct nfs_pathconf pathinfo;

		pathinfo.fattr = fattr;
		nfs_fattr_init(fattr);

		if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
			server->namelen = pathinfo.max_namelen;
	}

	dprintk("<-- nfs_probe_fsinfo() = 0\n");
	return 0;

out_error:
	dprintk("nfs_probe_fsinfo: error = %d\n", -error);
	return error;
}

/*
 * Copy useful information when duplicating a server record
 */
static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
{
	target->flags = source->flags;
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
}

/*
 * Allocate and initialise a server record
 */
static struct nfs_server *nfs_alloc_server(void)
{
	struct nfs_server *server;

	server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
	if (!server)
		return NULL;

	server->client = server->client_acl = ERR_PTR(-EINVAL);

	/* Zero out the NFS state stuff */
	INIT_LIST_HEAD(&server->client_link);
	INIT_LIST_HEAD(&server->master_link);

942 943
	atomic_set(&server->active, 0);

944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

	return server;
}

/*
 * Free up a server record
 */
void nfs_free_server(struct nfs_server *server)
{
	dprintk("--> nfs_free_server()\n");

	spin_lock(&nfs_client_lock);
	list_del(&server->client_link);
	list_del(&server->master_link);
	spin_unlock(&nfs_client_lock);

	if (server->destroy != NULL)
		server->destroy(server);
967 968 969

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
970 971 972 973 974 975
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

	nfs_free_iostats(server->io_stats);
P
Peter Zijlstra 已提交
976
	bdi_destroy(&server->backing_dev_info);
977 978 979 980 981 982 983 984 985
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
986
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
	struct nfs_fattr fattr;
	int error;

	server = nfs_alloc_server();
	if (!server)
		return ERR_PTR(-ENOMEM);

	/* Get a client representation */
	error = nfs_init_server(server, data);
	if (error < 0)
		goto error;

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	/* Probe the root fh to retrieve its FSID */
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
	if (error < 0)
		goto error;
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
	if (server->nfs_client->rpc_ops->version == 3) {
		if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
			server->namelen = NFS3_MAXNAMLEN;
		if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
			server->caps |= NFS_CAP_READDIRPLUS;
	} else {
		if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
			server->namelen = NFS2_MAXNAMLEN;
	}

1020 1021 1022 1023 1024 1025 1026 1027 1028
	if (!(fattr.valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
	memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));

1029 1030 1031
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;
	return server;

error:
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
/*
 * Initialise an NFS4 client record
 */
static int nfs4_init_client(struct nfs_client *clp,
1055
		const struct rpc_timeout *timeparms,
1056
		const char *ip_addr,
C
Chuck Lever 已提交
1057 1058
		rpc_authflavor_t authflavour,
		int flags)
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
{
	int error;

	if (clp->cl_cons_state == NFS_CS_READY) {
		/* the client is initialised already */
		dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
		return 0;
	}

	/* Check NFS protocol revision and initialize RPC op vector */
	clp->rpc_ops = &nfs_v4_clientops;

1071
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
C
Chuck Lever 已提交
1072
				      1, flags & NFS_MOUNT_NORESVPORT);
1073 1074
	if (error < 0)
		goto error;
1075
	memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1076 1077 1078 1079

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1080
			__func__, error);
1081 1082
		goto error;
	}
T
Trond Myklebust 已提交
1083
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097

	nfs_mark_client_ready(clp, NFS_CS_READY);
	return 0;

error:
	nfs_mark_client_ready(clp, error);
	dprintk("<-- nfs4_init_client() = xerror %d\n", error);
	return error;
}

/*
 * Set up an NFS4 client
 */
static int nfs4_set_client(struct nfs_server *server,
1098 1099 1100
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1101
		const char *ip_addr,
1102
		rpc_authflavor_t authflavour,
1103
		int proto, const struct rpc_timeout *timeparms)
1104
{
1105 1106
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1107 1108
		.addr = addr,
		.addrlen = addrlen,
1109
		.rpc_ops = &nfs_v4_clientops,
1110
		.proto = proto,
1111
	};
1112 1113 1114 1115 1116 1117
	struct nfs_client *clp;
	int error;

	dprintk("--> nfs4_set_client()\n");

	/* Allocate or find a client reference we can use */
1118
	clp = nfs_get_client(&cl_init);
1119 1120 1121 1122
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
C
Chuck Lever 已提交
1123 1124
	error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
					server->flags);
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
	if (error < 0)
		goto error_put;

	server->nfs_client = clp;
	dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
	return 0;

error_put:
	nfs_put_client(clp);
error:
	dprintk("<-- nfs4_set_client() = xerror %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1143
		const struct nfs_parsed_mount_data *data)
1144
{
1145
	struct rpc_timeout timeparms;
1146 1147 1148 1149
	int error;

	dprintk("--> nfs4_init_server()\n");

1150 1151 1152
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1153 1154 1155 1156
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
	server->caps |= NFS_CAP_ATOMIC_OPEN;

1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
	/* Get a client record */
	error = nfs4_set_client(server,
			data->nfs_server.hostname,
			(const struct sockaddr *)&data->nfs_server.address,
			data->nfs_server.addrlen,
			data->client_address,
			data->auth_flavors[0],
			data->nfs_server.protocol,
			&timeparms);
	if (error < 0)
		goto error;

1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
	if (data->rsize)
		server->rsize = nfs_block_size(data->rsize, NULL);
	if (data->wsize)
		server->wsize = nfs_block_size(data->wsize, NULL);

	server->acregmin = data->acregmin * HZ;
	server->acregmax = data->acregmax * HZ;
	server->acdirmin = data->acdirmin * HZ;
	server->acdirmax = data->acdirmax * HZ;

1179 1180
	server->port = data->nfs_server.port;

1181
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1182

1183
error:
1184 1185 1186 1187 1188 1189 1190 1191 1192
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1193
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206
				      struct nfs_fh *mntfh)
{
	struct nfs_fattr fattr;
	struct nfs_server *server;
	int error;

	dprintk("--> nfs4_create_server()\n");

	server = nfs_alloc_server();
	if (!server)
		return ERR_PTR(-ENOMEM);

	/* set up the general RPC client */
1207
	error = nfs4_init_server(server, data);
1208 1209 1210 1211 1212 1213 1214 1215
	if (error < 0)
		goto error;

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	/* Probe the root fh to retrieve its FSID */
1216
	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1217 1218 1219
	if (error < 0)
		goto error;

1220 1221 1222
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1223 1224 1225 1226 1227 1228
	dprintk("Mount FH: %d\n", mntfh->size);

	error = nfs_probe_fsinfo(server, mntfh, &fattr);
	if (error < 0)
		goto error;

1229 1230 1231
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;
	dprintk("<-- nfs4_create_server() = %p\n", server);
	return server;

error:
	nfs_free_server(server);
	dprintk("<-- nfs4_create_server() = error %d\n", error);
	return ERR_PTR(error);
}

/*
 * Create an NFS4 referral server record
 */
struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1255
					       struct nfs_fh *mntfh)
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
{
	struct nfs_client *parent_client;
	struct nfs_server *server, *parent_server;
	struct nfs_fattr fattr;
	int error;

	dprintk("--> nfs4_create_referral_server()\n");

	server = nfs_alloc_server();
	if (!server)
		return ERR_PTR(-ENOMEM);

	parent_server = NFS_SB(data->sb);
	parent_client = parent_server->nfs_client;

1271 1272 1273 1274
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
	server->caps |= NFS_CAP_ATOMIC_OPEN;

1275 1276
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1277
	error = nfs4_set_client(server, data->hostname,
1278 1279
				data->addr,
				data->addrlen,
1280 1281 1282
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
1283
				parent_server->client->cl_timeout);
1284 1285
	if (error < 0)
		goto error;
1286

1287
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1288 1289 1290 1291 1292 1293 1294
	if (error < 0)
		goto error;

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

1295 1296 1297 1298 1299
	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_path_walk(server, mntfh, data->mnt_path);
	if (error < 0)
		goto error;

1300
	/* probe the filesystem info for this server filesystem */
1301
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
1302 1303 1304
	if (error < 0)
		goto error;

1305 1306 1307
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1308
	dprintk("Referral FSID: %llx:%llx\n",
1309 1310
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;

	dprintk("<-- nfs_create_referral_server() = %p\n", server);
	return server;

error:
	nfs_free_server(server);
	dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
	return ERR_PTR(error);
}

#endif /* CONFIG_NFS_V4 */

/*
 * Clone an NFS2, NFS3 or NFS4 server record
 */
struct nfs_server *nfs_clone_server(struct nfs_server *source,
				    struct nfs_fh *fh,
				    struct nfs_fattr *fattr)
{
	struct nfs_server *server;
	struct nfs_fattr fattr_fsinfo;
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1342 1343
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355

	server = nfs_alloc_server();
	if (!server)
		return ERR_PTR(-ENOMEM);

	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1356 1357 1358
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
	if (error < 0)
		goto out_free_server;
	if (!IS_ERR(source->client_acl))
		nfs_init_server_aclclient(server);

	/* probe the filesystem info for this server filesystem */
	error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
	if (error < 0)
		goto out_free_server;

1369 1370 1371
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1372
	dprintk("Cloned FSID: %llx:%llx\n",
1373 1374
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394

	error = nfs_start_lockd(server);
	if (error < 0)
		goto out_free_server;

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;

	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411

#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_fs_nfs;

static int nfs_server_list_open(struct inode *inode, struct file *file);
static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
static void nfs_server_list_stop(struct seq_file *p, void *v);
static int nfs_server_list_show(struct seq_file *m, void *v);

static struct seq_operations nfs_server_list_ops = {
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1412
static const struct file_operations nfs_server_list_fops = {
1413 1414 1415 1416
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1417
	.owner		= THIS_MODULE,
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432
};

static int nfs_volume_list_open(struct inode *inode, struct file *file);
static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
static void nfs_volume_list_stop(struct seq_file *p, void *v);
static int nfs_volume_list_show(struct seq_file *m, void *v);

static struct seq_operations nfs_volume_list_ops = {
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1433
static const struct file_operations nfs_volume_list_fops = {
1434 1435 1436 1437
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1438
	.owner		= THIS_MODULE,
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
};

/*
 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
 * we're dealing
 */
static int nfs_server_list_open(struct inode *inode, struct file *file)
{
	struct seq_file *m;
	int ret;

	ret = seq_open(file, &nfs_server_list_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
	m->private = PDE(inode)->data;

	return 0;
}

/*
 * set up the iterator to start reading from the server list and return the first item
 */
static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
{
	/* lock the list against modification */
	spin_lock(&nfs_client_lock);
1467
	return seq_list_start_head(&nfs_client_list, *_pos);
1468 1469 1470 1471 1472 1473 1474
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1475
	return seq_list_next(v, &nfs_client_list, pos);
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
}

/*
 * clean up after reading from the transports list
 */
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
	spin_unlock(&nfs_client_lock);
}

/*
 * display a header line followed by a load of call lines
 */
static int nfs_server_list_show(struct seq_file *m, void *v)
{
	struct nfs_client *clp;

	/* display header on line 1 */
1494
	if (v == &nfs_client_list) {
1495 1496 1497 1498 1499 1500 1501
		seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
		return 0;
	}

	/* display one transport per line on subsequent lines */
	clp = list_entry(v, struct nfs_client, cl_share_link);

1502
	seq_printf(m, "v%u %s %s %3d %s\n",
1503
		   clp->rpc_ops->version,
1504 1505
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);

	return 0;
}

/*
 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
 */
static int nfs_volume_list_open(struct inode *inode, struct file *file)
{
	struct seq_file *m;
	int ret;

	ret = seq_open(file, &nfs_volume_list_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
	m->private = PDE(inode)->data;

	return 0;
}

/*
 * set up the iterator to start reading from the volume list and return the first item
 */
static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
{
	/* lock the list against modification */
	spin_lock(&nfs_client_lock);
1537
	return seq_list_start_head(&nfs_volume_list, *_pos);
1538 1539 1540 1541 1542 1543 1544
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1545
	return seq_list_next(v, &nfs_volume_list, pos);
1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
}

/*
 * clean up after reading from the transports list
 */
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
	spin_unlock(&nfs_client_lock);
}

/*
 * display a header line followed by a load of call lines
 */
static int nfs_volume_list_show(struct seq_file *m, void *v)
{
	struct nfs_server *server;
	struct nfs_client *clp;
	char dev[8], fsid[17];

	/* display header on line 1 */
1566
	if (v == &nfs_volume_list) {
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
		seq_puts(m, "NV SERVER   PORT DEV     FSID\n");
		return 0;
	}
	/* display one transport per line on subsequent lines */
	server = list_entry(v, struct nfs_server, master_link);
	clp = server->nfs_client;

	snprintf(dev, 8, "%u:%u",
		 MAJOR(server->s_dev), MINOR(server->s_dev));

	snprintf(fsid, 17, "%llx:%llx",
1578 1579
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1580

1581
	seq_printf(m, "v%u %s %s %-7s %-17s\n",
1582
		   clp->rpc_ops->version,
1583 1584
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
		   dev,
		   fsid);

	return 0;
}

/*
 * initialise the /proc/fs/nfsfs/ directory
 */
int __init nfs_fs_proc_init(void)
{
	struct proc_dir_entry *p;

A
Alexey Dobriyan 已提交
1598
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1599 1600 1601 1602
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
1603 1604
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1605 1606 1607 1608
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1609 1610
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1611 1612 1613 1614 1615 1616 1617
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
1618
	remove_proc_entry("fs/nfsfs", NULL);
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
error_0:
	return -ENOMEM;
}

/*
 * clean up the /proc/fs/nfsfs/ directory
 */
void nfs_fs_proc_exit(void)
{
	remove_proc_entry("volumes", proc_fs_nfs);
	remove_proc_entry("servers", proc_fs_nfs);
A
Alexey Dobriyan 已提交
1630
	remove_proc_entry("fs/nfsfs", NULL);
1631 1632 1633
}

#endif /* CONFIG_PROC_FS */