client.c 38.0 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 48 49 50 51 52
#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"

#define NFSDBG_FACILITY		NFSDBG_CLIENT

static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
53
static LIST_HEAD(nfs_volume_list);
54 55
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);

56 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
/*
 * 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 */

98 99
struct nfs_client_initdata {
	const char *hostname;
100
	const struct sockaddr *addr;
101
	size_t addrlen;
102
	const struct nfs_rpc_ops *rpc_ops;
103
	int proto;
104 105
};

106 107 108 109 110 111
/*
 * Allocate a shared client record
 *
 * Since these are allocated/deallocated very rarely, we don't
 * bother putting them in a slab cache...
 */
112
static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
113 114
{
	struct nfs_client *clp;
115
	struct rpc_cred *cred;
116 117 118 119

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

120 121 122
	clp->rpc_ops = cl_init->rpc_ops;

	if (cl_init->rpc_ops->version == 4) {
123 124 125 126 127 128 129 130
		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;

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

134 135
	if (cl_init->hostname) {
		clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
136 137 138 139 140 141 142
		if (!clp->cl_hostname)
			goto error_3;
	}

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

143 144
	clp->cl_proto = cl_init->proto;

145 146 147 148
#ifdef CONFIG_NFS_V4
	init_rwsem(&clp->cl_sem);
	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;
157 158 159 160

	return clp;

error_3:
T
Trond Myklebust 已提交
161 162
	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
		nfs_callback_down();
163 164 165 166 167 168
error_2:
	kfree(clp);
error_0:
	return NULL;
}

169 170 171 172 173
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);
174
	BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
175 176
	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
		nfs_idmap_delete(clp);
177 178

	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
179 180 181
#endif
}

182 183 184 185 186
/*
 * Destroy a shared client record
 */
static void nfs_free_client(struct nfs_client *clp)
{
187
	dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
188

189
	nfs4_shutdown_client(clp);
190 191 192 193 194 195 196 197

	/* -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();

198 199 200
	if (clp->cl_machine_cred != NULL)
		put_rpccred(clp->cl_machine_cred);

201 202 203 204 205 206 207 208 209 210 211
	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
212 213 214
	if (!clp)
		return;

215 216 217 218 219 220 221 222 223 224 225 226
	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);
	}
}

227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252
static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
				 const struct sockaddr_in *sa2)
{
	return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
}

static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
				 const struct sockaddr_in6 *sa2)
{
	return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
}

static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
				 const struct sockaddr *sa2)
{
	switch (sa1->sa_family) {
	case AF_INET:
		return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
				(const struct sockaddr_in *)sa2);
	case AF_INET6:
		return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
				(const struct sockaddr_in6 *)sa2);
	}
	BUG();
}

253
/*
254 255
 * Find a client by IP address and protocol version
 * - returns NULL if no such client
256
 */
257
struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
258 259 260
{
	struct nfs_client *clp;

261
	spin_lock(&nfs_client_lock);
262
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
263 264
		struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

265
		/* Don't match clients that failed to initialise properly */
266
		if (clp->cl_cons_state != NFS_CS_READY)
267 268
			continue;

269
		/* Different NFS versions cannot share the same nfs_client */
270
		if (clp->rpc_ops->version != nfsversion)
271 272
			continue;

273 274
		if (addr->sa_family != clap->sa_family)
			continue;
275
		/* Match only the IP address, not the port number */
276
		if (!nfs_sockaddr_match_ipaddr(addr, clap))
277 278
			continue;

279 280 281
		atomic_inc(&clp->cl_count);
		spin_unlock(&nfs_client_lock);
		return clp;
282
	}
283
	spin_unlock(&nfs_client_lock);
284 285 286
	return NULL;
}

287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321
/*
 * 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;

		if (sap->sa_family != clap->sa_family)
			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;
}

322
/*
323 324
 * Find an nfs_client on the list that matches the initialisation data
 * that is supplied.
325
 */
326
static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
327 328 329
{
	struct nfs_client *clp;

330 331 332 333 334 335
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
		/* 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 */
336
		if (clp->rpc_ops != data->rpc_ops)
337 338
			continue;

339 340 341
		if (clp->cl_proto != data->proto)
			continue;

342 343 344 345 346 347
		/* Match the full socket address */
		if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
			continue;

		atomic_inc(&clp->cl_count);
		return clp;
348
	}
349
	return NULL;
350 351 352 353 354 355
}

/*
 * Look up a client by IP address and protocol version
 * - creates a new record if one doesn't yet exist
 */
356
static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
357 358 359 360
{
	struct nfs_client *clp, *new = NULL;
	int error;

361 362
	dprintk("--> nfs_get_client(%s,v%u)\n",
		cl_init->hostname ?: "", cl_init->rpc_ops->version);
363 364 365 366 367

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

368
		clp = nfs_match_client(cl_init);
369 370 371 372 373 374 375
		if (clp)
			goto found_client;
		if (new)
			goto install_client;

		spin_unlock(&nfs_client_lock);

376
		new = nfs_alloc_client(cl_init);
377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397
	} 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);

398
	error = wait_event_killable(nfs_client_active_wq,
399 400 401 402
				clp->cl_cons_state != NFS_CS_INITING);
	if (error < 0) {
		nfs_put_client(clp);
		return ERR_PTR(-ERESTARTSYS);
403 404 405 406 407 408 409 410
	}

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

411 412
	BUG_ON(clp->cl_cons_state != NFS_CS_READY);

413 414 415 416 417 418 419
	dprintk("--> nfs_get_client() = %p [share]\n", clp);
	return clp;
}

/*
 * Mark a server as ready or failed
 */
420
static void nfs_mark_client_ready(struct nfs_client *clp, int state)
421 422 423 424
{
	clp->cl_cons_state = state;
	wake_up_all(&nfs_client_active_wq);
}
425 426 427 428 429 430 431 432 433 434 435 436 437

/*
 * 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;
	if (!to->to_retries)
		to->to_retries = 2;

	switch (proto) {
438
	case XPRT_TRANSPORT_TCP:
\
\"Talpey, Thomas\ 已提交
439
	case XPRT_TRANSPORT_RDMA:
440
		if (to->to_initval == 0)
441 442 443 444 445
			to->to_initval = 60 * HZ;
		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);
446 447 448 449
		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;
450 451
		to->to_exponential = 0;
		break;
452
	case XPRT_TRANSPORT_UDP:
453 454 455 456 457 458 459 460 461 462 463 464 465 466
	default:
		if (!to->to_initval)
			to->to_initval = 11 * HZ / 10;
		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;
	}
}

/*
 * Create an RPC client handle
 */
467
static int nfs_create_rpc_client(struct nfs_client *clp,
468 469 470
				 const struct rpc_timeout *timeparms,
				 rpc_authflavor_t flavor,
				 int flags)
471 472
{
	struct rpc_clnt		*clnt = NULL;
473
	struct rpc_create_args args = {
474
		.protocol	= clp->cl_proto,
475
		.address	= (struct sockaddr *)&clp->cl_addr,
476
		.addrsize	= clp->cl_addrlen,
477
		.timeout	= timeparms,
478 479 480 481
		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
482
		.flags		= flags,
483
	};
484 485 486 487

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

488
	clnt = rpc_create(&args);
489 490 491 492 493 494 495 496 497
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
				__FUNCTION__, PTR_ERR(clnt));
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
498 499 500 501 502 503 504

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
	if (!(server->flags & NFS_MOUNT_NONLM))
505
		nlmclnt_done(server->nlm_host);
506 507 508 509 510 511 512
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
513 514
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
515 516 517 518 519 520 521 522
	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,
	};
523

524
	if (nlm_init.nfs_version > 3)
525
		return 0;
526
	if (server->flags & NFS_MOUNT_NONLM)
527 528
		return 0;

529
	host = nlmclnt_init(&nlm_init);
530 531 532 533 534 535
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
536 537 538 539 540 541 542 543
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
544
	if (server->nfs_client->rpc_ops->version != 3)
545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570
		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
 */
571 572 573
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
574 575 576 577 578 579 580 581 582
{
	struct nfs_client *clp = server->nfs_client;

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

583 584 585 586 587
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
			dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
			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
 */
607
static int nfs_init_client(struct nfs_client *clp,
608
			   const struct rpc_timeout *timeparms,
609
			   const struct nfs_parsed_mount_data *data)
610 611 612 613 614 615 616 617 618 619 620 621 622
{
	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
	 */
623
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0);
624 625 626 627 628 629 630 631 632 633 634 635 636 637
	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
 */
638 639
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
640
{
641 642
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
643
		.addr = (const struct sockaddr *)&data->nfs_server.address,
644
		.addrlen = data->nfs_server.addrlen,
645
		.rpc_ops = &nfs_v2_clientops,
646
		.proto = data->nfs_server.protocol,
647
	};
648
	struct rpc_timeout timeparms;
649
	struct nfs_client *clp;
650
	int error;
651 652 653 654 655

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

#ifdef CONFIG_NFS_V3
	if (data->flags & NFS_MOUNT_VER3)
656
		cl_init.rpc_ops = &nfs_v3_clientops;
657 658 659
#endif

	/* Allocate or find a client reference we can use */
660
	clp = nfs_get_client(&cl_init);
661 662 663 664 665
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

666 667 668
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
	error = nfs_init_client(clp, &timeparms, data);
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691
	if (error < 0)
		goto error;

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
	server->flags = data->flags & NFS_MOUNT_FLAGMASK;

	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;

692 693
	server->port = data->nfs_server.port;

694
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
695 696 697
	if (error < 0)
		goto error;

698 699 700 701 702 703 704 705 706 707
	/* 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;

708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744
	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
745

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
	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
796 797 798 799
	error = bdi_init(&server->backing_dev_info);
	if (error)
		goto out_error;

800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849

	/* 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);

850 851 852
	init_waitqueue_head(&server->active_wq);
	atomic_set(&server->active, 0);

853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
	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);
876 877 878

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
879 880 881 882 883 884
	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
885
	bdi_destroy(&server->backing_dev_info);
886 887 888 889 890 891 892 893 894
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
895
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
				     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;
919 920 921 922 923 924 925 926 927 928
	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;
	}

929 930 931 932 933 934 935 936 937
	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));

938 939 940
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963

	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,
964
		const struct rpc_timeout *timeparms,
965
		const char *ip_addr,
966 967 968 969 970 971 972 973 974 975 976 977 978
		rpc_authflavor_t authflavour)
{
	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;

979
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
980
					RPC_CLNT_CREATE_DISCRTRY);
981 982
	if (error < 0)
		goto error;
983
	memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
984 985 986 987 988 989 990

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
			__FUNCTION__, error);
		goto error;
	}
T
Trond Myklebust 已提交
991
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005

	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,
1006 1007 1008
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1009
		const char *ip_addr,
1010
		rpc_authflavor_t authflavour,
1011
		int proto, const struct rpc_timeout *timeparms)
1012
{
1013 1014
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1015 1016
		.addr = addr,
		.addrlen = addrlen,
1017
		.rpc_ops = &nfs_v4_clientops,
1018
		.proto = proto,
1019
	};
1020 1021 1022 1023 1024 1025
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1026
	clp = nfs_get_client(&cl_init);
1027 1028 1029 1030
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
1031
	error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
	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,
1050
		const struct nfs_parsed_mount_data *data)
1051
{
1052
	struct rpc_timeout timeparms;
1053 1054 1055 1056
	int error;

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

1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

	/* 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;

1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
	/* Initialise the client representation from the mount data */
	server->flags = data->flags & NFS_MOUNT_FLAGMASK;
	server->caps |= NFS_CAP_ATOMIC_OPEN;

	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;

1086 1087
	server->port = data->nfs_server.port;

1088
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1089

1090
error:
1091 1092 1093 1094 1095 1096 1097 1098 1099
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1100
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
				      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 */
1114
	error = nfs4_init_server(server, data);
1115 1116 1117 1118 1119 1120 1121 1122
	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 */
1123
	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1124 1125 1126
	if (error < 0)
		goto error;

1127 1128 1129
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1130 1131 1132 1133 1134 1135
	dprintk("Mount FH: %d\n", mntfh->size);

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

1136 1137 1138
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
	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,
1162
					       struct nfs_fh *mntfh)
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
{
	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;

	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1180
	error = nfs4_set_client(server, data->hostname,
1181 1182
				data->addr,
				data->addrlen,
1183 1184 1185
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
1186
				parent_server->client->cl_timeout);
1187 1188
	if (error < 0)
		goto error;
1189 1190 1191 1192 1193

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

1194
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1195 1196 1197 1198 1199 1200 1201
	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);

1202 1203 1204 1205 1206
	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_path_walk(server, mntfh, data->mnt_path);
	if (error < 0)
		goto error;

1207
	/* probe the filesystem info for this server filesystem */
1208
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
1209 1210 1211
	if (error < 0)
		goto error;

1212 1213 1214
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1215
	dprintk("Referral FSID: %llx:%llx\n",
1216 1217
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248

	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",
1249 1250
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262

	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;

1263 1264 1265
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
	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;

1276 1277 1278
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1279
	dprintk("Cloned FSID: %llx:%llx\n",
1280 1281
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301

	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);
}
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318

#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,
};

1319
static const struct file_operations nfs_server_list_fops = {
1320 1321 1322 1323
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1324
	.owner		= THIS_MODULE,
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
};

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,
};

1340
static const struct file_operations nfs_volume_list_fops = {
1341 1342 1343 1344
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1345
	.owner		= THIS_MODULE,
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
};

/*
 * 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);
1374
	return seq_list_start_head(&nfs_client_list, *_pos);
1375 1376 1377 1378 1379 1380 1381
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1382
	return seq_list_next(v, &nfs_client_list, pos);
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
}

/*
 * 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 */
1401
	if (v == &nfs_client_list) {
1402 1403 1404 1405 1406 1407 1408
		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);

1409
	seq_printf(m, "v%u %s %s %3d %s\n",
1410
		   clp->rpc_ops->version,
1411 1412
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
		   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);
1444
	return seq_list_start_head(&nfs_volume_list, *_pos);
1445 1446 1447 1448 1449 1450 1451
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1452
	return seq_list_next(v, &nfs_volume_list, pos);
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
}

/*
 * 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 */
1473
	if (v == &nfs_volume_list) {
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
		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",
1485 1486
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1487

1488
	seq_printf(m, "v%u %s %s %-7s %-17s\n",
1489
		   clp->rpc_ops->version,
1490 1491
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
		   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
1505
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1506 1507 1508 1509 1510 1511
	if (!proc_fs_nfs)
		goto error_0;

	proc_fs_nfs->owner = THIS_MODULE;

	/* a file of servers with which we're dealing */
1512 1513
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1514 1515 1516 1517
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1518 1519
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1520 1521 1522 1523 1524 1525 1526
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
1527
	remove_proc_entry("fs/nfsfs", NULL);
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
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
1539
	remove_proc_entry("fs/nfsfs", NULL);
1540 1541 1542
}

#endif /* CONFIG_PROC_FS */