client.c 45.2 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
#include <linux/in6.h>
38
#include <linux/slab.h>
39
#include <net/ipv6.h>
40
#include <linux/nfs_xdr.h>
A
Andy Adamson 已提交
41
#include <linux/sunrpc/bc_xprt.h>
42 43 44 45 46 47 48 49

#include <asm/system.h>

#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
50
#include "fscache.h"
R
Ricardo Labiaga 已提交
51
#include "pnfs.h"
52 53 54 55 56

#define NFSDBG_FACILITY		NFSDBG_CLIENT

static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
57
static LIST_HEAD(nfs_volume_list);
58 59
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);

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 99 100 101
/*
 * 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 */

102 103
struct nfs_client_initdata {
	const char *hostname;
104
	const struct sockaddr *addr;
105
	size_t addrlen;
106
	const struct nfs_rpc_ops *rpc_ops;
107
	int proto;
108
	u32 minorversion;
109 110
};

111 112 113 114 115 116
/*
 * Allocate a shared client record
 *
 * Since these are allocated/deallocated very rarely, we don't
 * bother putting them in a slab cache...
 */
117
static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
118 119
{
	struct nfs_client *clp;
120
	struct rpc_cred *cred;
121
	int err = -ENOMEM;
122 123 124 125

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

126 127
	clp->rpc_ops = cl_init->rpc_ops;

128 129 130
	atomic_set(&clp->cl_count, 1);
	clp->cl_cons_state = NFS_CS_INITING;

131 132
	memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
	clp->cl_addrlen = cl_init->addrlen;
133

134
	if (cl_init->hostname) {
135
		err = -ENOMEM;
136
		clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
137
		if (!clp->cl_hostname)
138
			goto error_cleanup;
139 140 141 142 143
	}

	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
	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
	clp->cl_boot_time = CURRENT_TIME;
	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
153
	clp->cl_minorversion = cl_init->minorversion;
154
	clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
155
#endif
156 157 158
	cred = rpc_lookup_machine_cred();
	if (!IS_ERR(cred))
		clp->cl_machine_cred = cred;
159 160 161
#if defined(CONFIG_NFS_V4_1)
	INIT_LIST_HEAD(&clp->cl_layouts);
#endif
162 163
	nfs_fscache_get_client_cookie(clp);

164 165
	return clp;

166
error_cleanup:
167 168
	kfree(clp);
error_0:
169
	return ERR_PTR(err);
170 171
}

172
#ifdef CONFIG_NFS_V4
173 174 175 176 177 178 179 180 181 182 183
/*
 * Clears/puts all minor version specific parts from an nfs_client struct
 * reverting it to minorversion 0.
 */
static void nfs4_clear_client_minor_version(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
	if (nfs4_has_session(clp)) {
		nfs4_destroy_session(clp->cl_session);
		clp->cl_session = NULL;
	}
A
Andy Adamson 已提交
184

185
	clp->cl_mvops = nfs_v4_minor_ops[0];
186
#endif /* CONFIG_NFS_V4_1 */
187
}
188

189 190 191 192 193 194
/*
 * Destroy the NFS4 callback service
 */
static void nfs4_destroy_callback(struct nfs_client *clp)
{
	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
195
		nfs_callback_down(clp->cl_mvops->minor_version);
196 197 198 199 200 201 202
}

static void nfs4_shutdown_client(struct nfs_client *clp)
{
	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
		nfs4_kill_renewd(clp);
	nfs4_clear_client_minor_version(clp);
203
	nfs4_destroy_callback(clp);
204 205 206 207
	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
		nfs_idmap_delete(clp);

	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
208
}
209 210 211 212 213
#else
static void nfs4_shutdown_client(struct nfs_client *clp)
{
}
#endif /* CONFIG_NFS_V4 */
214

215 216 217 218 219
/*
 * Destroy a shared client record
 */
static void nfs_free_client(struct nfs_client *clp)
{
220
	dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
221

222
	nfs4_shutdown_client(clp);
223

224 225
	nfs_fscache_release_client_cookie(clp);

226 227 228 229
	/* -EIO all pending I/O */
	if (!IS_ERR(clp->cl_rpcclient))
		rpc_shutdown_client(clp->cl_rpcclient);

230 231 232
	if (clp->cl_machine_cred != NULL)
		put_rpccred(clp->cl_machine_cred);

233 234 235 236 237 238 239 240 241 242 243
	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
244 245 246
	if (!clp)
		return;

247 248 249 250 251 252 253 254 255 256 257
	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);
	}
}
258
EXPORT_SYMBOL_GPL(nfs_put_client);
259

260
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
261 262 263 264 265 266 267 268 269 270 271
/*
 * 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.
 */
272 273
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
274
{
275 276
	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
277

278 279
	if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
	    sin1->sin6_scope_id != sin2->sin6_scope_id)
280
		return 0;
281

282
	return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
283
}
284 285 286
#else	/* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
287 288 289
{
	return 0;
}
290
#endif
291

I
Ian Dall 已提交
292 293 294 295 296 297 298
/*
 * 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.
 */
299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
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);
}

318 319
static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
				const struct sockaddr *sa2)
I
Ian Dall 已提交
320
{
321 322
	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
323

324 325 326 327 328 329 330 331 332 333 334 335
	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
336
		return 0;
337 338 339 340 341 342 343 344

	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
345 346 347 348
}

/*
 * Test if two socket addresses represent the same actual socket,
349
 * by comparing (only) relevant fields, including the port number.
I
Ian Dall 已提交
350 351 352 353 354 355 356 357 358
 */
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:
359
		return nfs_sockaddr_cmp_ip4(sa1, sa2);
I
Ian Dall 已提交
360
	case AF_INET6:
361
		return nfs_sockaddr_cmp_ip6(sa1, sa2);
I
Ian Dall 已提交
362 363 364 365
	}
	return 0;
}

366
/*
367 368
 * Find a client by IP address and protocol version
 * - returns NULL if no such client
369
 */
370
struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
371 372 373
{
	struct nfs_client *clp;

374
	spin_lock(&nfs_client_lock);
375
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
376 377
		struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

378
		/* Don't match clients that failed to initialise properly */
379 380
		if (!(clp->cl_cons_state == NFS_CS_READY ||
		      clp->cl_cons_state == NFS_CS_SESSION_INITING))
381 382
			continue;

383
		/* Different NFS versions cannot share the same nfs_client */
384
		if (clp->rpc_ops->version != nfsversion)
385 386
			continue;

387
		/* Match only the IP address, not the port number */
388
		if (!nfs_sockaddr_match_ipaddr(addr, clap))
389 390
			continue;

391 392 393
		atomic_inc(&clp->cl_count);
		spin_unlock(&nfs_client_lock);
		return clp;
394
	}
395
	spin_unlock(&nfs_client_lock);
396 397 398
	return NULL;
}

399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431
/*
 * 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;
}

432
/*
433 434
 * Find an nfs_client on the list that matches the initialisation data
 * that is supplied.
435
 */
436
static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
437 438
{
	struct nfs_client *clp;
I
Ian Dall 已提交
439
	const struct sockaddr *sap = data->addr;
440

441
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
I
Ian Dall 已提交
442
	        const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
443 444 445 446 447
		/* 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 */
448
		if (clp->rpc_ops != data->rpc_ops)
449 450
			continue;

451 452
		if (clp->cl_proto != data->proto)
			continue;
453 454 455
		/* Match nfsv4 minorversion */
		if (clp->cl_minorversion != data->minorversion)
			continue;
456
		/* Match the full socket address */
I
Ian Dall 已提交
457
		if (!nfs_sockaddr_cmp(sap, clap))
458 459 460 461
			continue;

		atomic_inc(&clp->cl_count);
		return clp;
462
	}
463
	return NULL;
464 465 466 467 468 469
}

/*
 * Look up a client by IP address and protocol version
 * - creates a new record if one doesn't yet exist
 */
470
static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
471 472 473 474
{
	struct nfs_client *clp, *new = NULL;
	int error;

475 476
	dprintk("--> nfs_get_client(%s,v%u)\n",
		cl_init->hostname ?: "", cl_init->rpc_ops->version);
477 478 479 480 481

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

482
		clp = nfs_match_client(cl_init);
483 484 485 486 487 488 489
		if (clp)
			goto found_client;
		if (new)
			goto install_client;

		spin_unlock(&nfs_client_lock);

490
		new = nfs_alloc_client(cl_init);
491
	} while (!IS_ERR(new));
492

493 494
	dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
	return new;
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512

	/* 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);

513
	error = wait_event_killable(nfs_client_active_wq,
514
				clp->cl_cons_state < NFS_CS_INITING);
515 516 517
	if (error < 0) {
		nfs_put_client(clp);
		return ERR_PTR(-ERESTARTSYS);
518 519 520 521 522 523 524 525
	}

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

526 527
	BUG_ON(clp->cl_cons_state != NFS_CS_READY);

528 529 530 531 532 533 534
	dprintk("--> nfs_get_client() = %p [share]\n", clp);
	return clp;
}

/*
 * Mark a server as ready or failed
 */
535
void nfs_mark_client_ready(struct nfs_client *clp, int state)
536 537 538 539
{
	clp->cl_cons_state = state;
	wake_up_all(&nfs_client_active_wq);
}
540

541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
/*
 * With sessions, the client is not marked ready until after a
 * successful EXCHANGE_ID and CREATE_SESSION.
 *
 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
 * other versions of NFS can be tried.
 */
int nfs4_check_client_ready(struct nfs_client *clp)
{
	if (!nfs4_has_session(clp))
		return 0;
	if (clp->cl_cons_state < NFS_CS_READY)
		return -EPROTONOSUPPORT;
	return 0;
}

557 558 559 560 561 562 563 564 565 566
/*
 * 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) {
567
	case XPRT_TRANSPORT_TCP:
\
\"Talpey, Thomas\ 已提交
568
	case XPRT_TRANSPORT_RDMA:
569 570
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_TCP_RETRANS;
571
		if (to->to_initval == 0)
572
			to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
573 574 575 576
		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);
577 578 579 580
		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;
581 582
		to->to_exponential = 0;
		break;
583
	case XPRT_TRANSPORT_UDP:
584 585
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
586
		if (!to->to_initval)
587
			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
588 589 590 591 592
		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;
593 594
	default:
		BUG();
595 596 597 598 599 600
	}
}

/*
 * Create an RPC client handle
 */
601
static int nfs_create_rpc_client(struct nfs_client *clp,
602 603
				 const struct rpc_timeout *timeparms,
				 rpc_authflavor_t flavor,
604
				 int discrtry, int noresvport)
605 606
{
	struct rpc_clnt		*clnt = NULL;
607
	struct rpc_create_args args = {
608
		.net		= &init_net,
609
		.protocol	= clp->cl_proto,
610
		.address	= (struct sockaddr *)&clp->cl_addr,
611
		.addrsize	= clp->cl_addrlen,
612
		.timeout	= timeparms,
613 614 615 616 617
		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
618

619 620 621 622 623
	if (discrtry)
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
	if (noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

624 625 626
	if (!IS_ERR(clp->cl_rpcclient))
		return 0;

627
	clnt = rpc_create(&args);
628 629
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
630
				__func__, PTR_ERR(clnt));
631 632 633 634 635 636
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
637 638 639 640 641 642

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
643 644
	if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
			!(server->flags & NFS_MOUNT_LOCAL_FCNTL))
645
		nlmclnt_done(server->nlm_host);
646 647 648 649 650 651 652
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
653 654
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
655 656 657 658 659
	struct nlmclnt_initdata nlm_init = {
		.hostname	= clp->cl_hostname,
		.address	= (struct sockaddr *)&clp->cl_addr,
		.addrlen	= clp->cl_addrlen,
		.nfs_version	= clp->rpc_ops->version,
660 661
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
662
	};
663

664
	if (nlm_init.nfs_version > 3)
665
		return 0;
666 667
	if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
			(server->flags & NFS_MOUNT_LOCAL_FCNTL))
668 669
		return 0;

670 671 672 673 674 675 676 677
	switch (clp->cl_proto) {
		default:
			nlm_init.protocol = IPPROTO_TCP;
			break;
		case XPRT_TRANSPORT_UDP:
			nlm_init.protocol = IPPROTO_UDP;
	}

678
	host = nlmclnt_init(&nlm_init);
679 680 681 682 683 684
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
685 686 687 688 689 690 691 692
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
693
	if (server->nfs_client->rpc_ops->version != 3)
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
		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
 */
720 721 722
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
723 724 725 726 727
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
728
		dprintk("%s: couldn't create rpc_client!\n", __func__);
729 730 731
		return PTR_ERR(server->client);
	}

732 733 734 735 736
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

737 738 739 740 741
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
742
			dprintk("%s: couldn't create credcache!\n", __func__);
743 744 745 746 747 748 749 750 751 752 753 754 755
			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
 */
756
static int nfs_init_client(struct nfs_client *clp,
757
			   const struct rpc_timeout *timeparms,
758
			   const struct nfs_parsed_mount_data *data)
759 760 761 762 763 764 765 766 767 768 769 770 771
{
	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
772 773
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
				      0, data->flags & NFS_MOUNT_NORESVPORT);
774 775 776 777 778 779 780 781 782 783 784 785 786 787
	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
 */
788 789
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
790
{
791 792
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
793
		.addr = (const struct sockaddr *)&data->nfs_server.address,
794
		.addrlen = data->nfs_server.addrlen,
795
		.rpc_ops = &nfs_v2_clientops,
796
		.proto = data->nfs_server.protocol,
797
	};
798
	struct rpc_timeout timeparms;
799
	struct nfs_client *clp;
800
	int error;
801 802 803 804

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

#ifdef CONFIG_NFS_V3
805
	if (data->version == 3)
806
		cl_init.rpc_ops = &nfs_v3_clientops;
807 808 809
#endif

	/* Allocate or find a client reference we can use */
810
	clp = nfs_get_client(&cl_init);
811 812 813 814 815
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

816 817 818
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
	error = nfs_init_client(clp, &timeparms, data);
819 820 821 822 823 824
	if (error < 0)
		goto error;

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
825
	server->flags = data->flags;
826
	server->options = data->options;
827 828 829
	server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
		NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
		NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845

	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;

846 847
	server->port = data->nfs_server.port;

848
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
849 850 851
	if (error < 0)
		goto error;

852 853 854 855 856 857 858 859 860 861
	/* 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;

862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	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
899

900
	server->backing_dev_info.name = "nfs";
901 902 903 904 905 906 907
	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;
R
Ricardo Labiaga 已提交
908 909
	set_pnfs_layoutdriver(server, fsinfo->layouttype);

910 911 912
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
913 914
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
915 916 917 918 919 920 921 922 923 924
	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;

R
Ricardo Labiaga 已提交
925 926
	server->time_delta = fsinfo->time_delta;

927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
	/* 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;
R
Ricardo Labiaga 已提交
949
	fsinfo.layouttype = 0;
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

	nfs_server_set_fsinfo(server, &fsinfo);

	/* 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;
981 982
	target->rsize = source->rsize;
	target->wsize = source->wsize;
983 984 985 986 987
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
988
	target->options = source->options;
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
}

/*
 * 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);

1008 1009
	atomic_set(&server->active, 0);

1010 1011 1012 1013 1014 1015
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

1016 1017 1018 1019 1020 1021
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
	return server;
}

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

R
Ricardo Labiaga 已提交
1032
	unset_pnfs_layoutdriver(server);
1033 1034 1035 1036 1037 1038 1039
	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);
1040 1041 1042

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1043 1044 1045 1046 1047 1048
	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
1049
	bdi_destroy(&server->backing_dev_info);
1050 1051 1052 1053 1054 1055 1056 1057 1058
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1059
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1060 1061 1062
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
1063
	struct nfs_fattr *fattr;
1064 1065 1066 1067 1068 1069
	int error;

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

1070 1071 1072 1073 1074
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
	/* 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 */
1085
	error = nfs_probe_fsinfo(server, mntfh, fattr);
1086 1087
	if (error < 0)
		goto error;
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
	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;
	}

1098 1099
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1100 1101 1102 1103 1104
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1105
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1106

1107 1108 1109
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1110 1111 1112 1113 1114 1115 1116

	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;
1117
	nfs_free_fattr(fattr);
1118 1119 1120
	return server;

error:
1121
	nfs_free_fattr(fattr);
1122 1123 1124 1125 1126
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
1127 1128 1129 1130 1131 1132 1133 1134
/*
 * Initialize the NFS4 callback service
 */
static int nfs4_init_callback(struct nfs_client *clp)
{
	int error;

	if (clp->rpc_ops->version == 4) {
A
Andy Adamson 已提交
1135 1136 1137 1138 1139 1140 1141 1142
		if (nfs4_has_session(clp)) {
			error = xprt_setup_backchannel(
						clp->cl_rpcclient->cl_xprt,
						NFS41_BC_MIN_CALLBACKS);
			if (error < 0)
				return error;
		}

1143
		error = nfs_callback_up(clp->cl_mvops->minor_version,
1144
					clp->cl_rpcclient->cl_xprt);
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
		if (error < 0) {
			dprintk("%s: failed to start callback. Error = %d\n",
				__func__, error);
			return error;
		}
		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
	}
	return 0;
}

1155 1156 1157 1158 1159 1160
/*
 * Initialize the minor version specific parts of an NFS4 client record
 */
static int nfs4_init_client_minor_version(struct nfs_client *clp)
{
#if defined(CONFIG_NFS_V4_1)
1161
	if (clp->cl_mvops->minor_version) {
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
		struct nfs4_session *session = NULL;
		/*
		 * Create the session and mark it expired.
		 * When a SEQUENCE operation encounters the expired session
		 * it will do session recovery to initialize it.
		 */
		session = nfs4_alloc_session(clp);
		if (!session)
			return -ENOMEM;

		clp->cl_session = session;
1173 1174 1175 1176 1177 1178 1179
		/*
		 * The create session reply races with the server back
		 * channel probe. Mark the client NFS_CS_SESSION_INITING
		 * so that the client back channel can find the
		 * nfs_client struct
		 */
		clp->cl_cons_state = NFS_CS_SESSION_INITING;
1180 1181 1182
	}
#endif /* CONFIG_NFS_V4_1 */

1183
	return nfs4_init_callback(clp);
1184 1185
}

1186 1187 1188 1189
/*
 * Initialise an NFS4 client record
 */
static int nfs4_init_client(struct nfs_client *clp,
1190
		const struct rpc_timeout *timeparms,
1191
		const char *ip_addr,
C
Chuck Lever 已提交
1192 1193
		rpc_authflavor_t authflavour,
		int flags)
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
{
	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;

1206
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
C
Chuck Lever 已提交
1207
				      1, flags & NFS_MOUNT_NORESVPORT);
1208 1209
	if (error < 0)
		goto error;
1210
	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1211 1212 1213 1214

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1215
			__func__, error);
1216 1217
		goto error;
	}
T
Trond Myklebust 已提交
1218
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1219

1220 1221 1222 1223
	error = nfs4_init_client_minor_version(clp);
	if (error < 0)
		goto error;

1224 1225
	if (!nfs4_has_session(clp))
		nfs_mark_client_ready(clp, NFS_CS_READY);
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
	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,
1238 1239 1240
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1241
		const char *ip_addr,
1242
		rpc_authflavor_t authflavour,
B
Benny Halevy 已提交
1243 1244
		int proto, const struct rpc_timeout *timeparms,
		u32 minorversion)
1245
{
1246 1247
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1248 1249
		.addr = addr,
		.addrlen = addrlen,
1250
		.rpc_ops = &nfs_v4_clientops,
1251
		.proto = proto,
1252
		.minorversion = minorversion,
1253
	};
1254 1255 1256 1257 1258 1259
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1260
	clp = nfs_get_client(&cl_init);
1261 1262 1263 1264
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
C
Chuck Lever 已提交
1265 1266
	error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
					server->flags);
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
	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;
}

1281

1282 1283 1284 1285 1286 1287 1288 1289
/*
 * Session has been established, and the client marked ready.
 * Set the mount rsize and wsize with negotiated fore channel
 * attributes which will be bound checked in nfs_server_set_fsinfo.
 */
static void nfs4_session_set_rwsize(struct nfs_server *server)
{
#ifdef CONFIG_NFS_V4_1
1290 1291 1292 1293
	struct nfs4_session *sess;
	u32 server_resp_sz;
	u32 server_rqst_sz;

1294 1295
	if (!nfs4_has_session(server->nfs_client))
		return;
1296 1297 1298 1299 1300 1301 1302 1303
	sess = server->nfs_client->cl_session;
	server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
	server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;

	if (server->rsize > server_resp_sz)
		server->rsize = server_resp_sz;
	if (server->wsize > server_rqst_sz)
		server->wsize = server_rqst_sz;
1304 1305 1306
#endif /* CONFIG_NFS_V4_1 */
}

1307 1308 1309 1310 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 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
static int nfs4_server_common_setup(struct nfs_server *server,
		struct nfs_fh *mntfh)
{
	struct nfs_fattr *fattr;
	int error;

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

	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		return -ENOMEM;

	/* We must ensure the session is initialised first */
	error = nfs4_init_session(server);
	if (error < 0)
		goto out;

	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_get_rootfh(server, mntfh);
	if (error < 0)
		goto out;

	dprintk("Server FSID: %llx:%llx\n",
			(unsigned long long) server->fsid.major,
			(unsigned long long) server->fsid.minor);
	dprintk("Mount FH: %d\n", mntfh->size);

	nfs4_session_set_rwsize(server);

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

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

	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;
out:
	nfs_free_fattr(fattr);
	return error;
}

1356 1357 1358 1359
/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1360
		const struct nfs_parsed_mount_data *data)
1361
{
1362
	struct rpc_timeout timeparms;
1363 1364 1365 1366
	int error;

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

1367 1368 1369
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1370 1371
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
B
Bryan Schumaker 已提交
1372 1373 1374
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
	if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
			server->caps |= NFS_CAP_READDIRPLUS;
1375
	server->options = data->options;
1376

1377 1378 1379 1380 1381 1382 1383 1384
	/* 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,
B
Benny Halevy 已提交
1385 1386
			&timeparms,
			data->minorversion);
1387 1388 1389
	if (error < 0)
		goto error;

1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
	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;

1400 1401
	server->port = data->nfs_server.port;

1402
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1403

1404
error:
1405 1406 1407 1408 1409 1410 1411 1412 1413
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1414
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
				      struct nfs_fh *mntfh)
{
	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 */
1427
	error = nfs4_init_server(server, data);
1428 1429 1430
	if (error < 0)
		goto error;

1431
	error = nfs4_server_common_setup(server, mntfh);
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	if (error < 0)
		goto error;

	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,
1448
					       struct nfs_fh *mntfh)
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
{
	struct nfs_client *parent_client;
	struct nfs_server *server, *parent_server;
	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;

1463 1464
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
1465
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1466

1467 1468
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1469
	error = nfs4_set_client(server, data->hostname,
1470 1471
				data->addr,
				data->addrlen,
1472 1473 1474
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
B
Benny Halevy 已提交
1475
				parent_server->client->cl_timeout,
1476
				parent_client->cl_mvops->minor_version);
1477 1478
	if (error < 0)
		goto error;
1479

1480
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1481 1482 1483
	if (error < 0)
		goto error;

1484
	error = nfs4_server_common_setup(server, mntfh);
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
	if (error < 0)
		goto error;

	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;
1507
	struct nfs_fattr *fattr_fsinfo;
1508 1509 1510
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1511 1512
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1513 1514 1515 1516 1517

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

1518 1519 1520 1521 1522
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1523 1524 1525 1526 1527 1528 1529
	/* 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;

1530 1531 1532
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1533 1534 1535 1536 1537 1538
	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 */
1539
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1540 1541 1542
	if (error < 0)
		goto out_free_server;

1543 1544 1545
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1546
	dprintk("Cloned FSID: %llx:%llx\n",
1547 1548
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560

	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;

1561
	nfs_free_fattr(fattr_fsinfo);
1562 1563 1564 1565
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1566
	nfs_free_fattr(fattr_fsinfo);
1567 1568 1569 1570
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580

#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);

J
James Morris 已提交
1581
static const struct seq_operations nfs_server_list_ops = {
1582 1583 1584 1585 1586 1587
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1588
static const struct file_operations nfs_server_list_fops = {
1589 1590 1591 1592
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1593
	.owner		= THIS_MODULE,
1594 1595 1596 1597 1598 1599 1600 1601
};

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);

J
James Morris 已提交
1602
static const struct seq_operations nfs_volume_list_ops = {
1603 1604 1605 1606 1607 1608
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1609
static const struct file_operations nfs_volume_list_fops = {
1610 1611 1612 1613
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1614
	.owner		= THIS_MODULE,
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
};

/*
 * 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);
1643
	return seq_list_start_head(&nfs_client_list, *_pos);
1644 1645 1646 1647 1648 1649 1650
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1651
	return seq_list_next(v, &nfs_client_list, pos);
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
}

/*
 * 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 */
1670
	if (v == &nfs_client_list) {
1671 1672 1673 1674 1675 1676 1677
		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);

1678
	seq_printf(m, "v%u %s %s %3d %s\n",
1679
		   clp->rpc_ops->version,
1680 1681
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
		   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);
1713
	return seq_list_start_head(&nfs_volume_list, *_pos);
1714 1715 1716 1717 1718 1719 1720
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1721
	return seq_list_next(v, &nfs_volume_list, pos);
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
}

/*
 * 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 */
1742
	if (v == &nfs_volume_list) {
D
David Howells 已提交
1743
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
		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",
1754 1755
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1756

D
David Howells 已提交
1757
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1758
		   clp->rpc_ops->version,
1759 1760
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1761
		   dev,
D
David Howells 已提交
1762 1763
		   fsid,
		   nfs_server_fscache_state(server));
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774

	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
1775
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1776 1777 1778 1779
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
1780 1781
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1782 1783 1784 1785
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1786 1787
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1788 1789 1790 1791 1792 1793 1794
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
1795
	remove_proc_entry("fs/nfsfs", NULL);
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
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
1807
	remove_proc_entry("fs/nfsfs", NULL);
1808 1809 1810
}

#endif /* CONFIG_PROC_FS */