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v4.17
   1/*
   2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   3 * Written by David Howells (dhowells@redhat.com)
   4 */
   5#include <linux/module.h>
   6#include <linux/nfs_fs.h>
 
   7#include <linux/nfs_mount.h>
   8#include <linux/sunrpc/addr.h>
   9#include <linux/sunrpc/auth.h>
  10#include <linux/sunrpc/xprt.h>
  11#include <linux/sunrpc/bc_xprt.h>
  12#include <linux/sunrpc/rpc_pipe_fs.h>
  13#include "internal.h"
  14#include "callback.h"
  15#include "delegation.h"
  16#include "nfs4session.h"
  17#include "nfs4idmap.h"
  18#include "pnfs.h"
  19#include "netns.h"
  20
  21#define NFSDBG_FACILITY		NFSDBG_CLIENT
  22
  23/*
  24 * Get a unique NFSv4.0 callback identifier which will be used
  25 * by the V4.0 callback service to lookup the nfs_client struct
  26 */
  27static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  28{
  29	int ret = 0;
  30	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  31
  32	if (clp->rpc_ops->version != 4 || minorversion != 0)
  33		return ret;
  34	idr_preload(GFP_KERNEL);
  35	spin_lock(&nn->nfs_client_lock);
  36	ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
  37	if (ret >= 0)
  38		clp->cl_cb_ident = ret;
  39	spin_unlock(&nn->nfs_client_lock);
  40	idr_preload_end();
  41	return ret < 0 ? ret : 0;
  42}
  43
  44#ifdef CONFIG_NFS_V4_1
  45/**
  46 * Per auth flavor data server rpc clients
  47 */
  48struct nfs4_ds_server {
  49	struct list_head	list;   /* ds_clp->cl_ds_clients */
  50	struct rpc_clnt		*rpc_clnt;
  51};
  52
  53/**
  54 * Common lookup case for DS I/O
  55 */
  56static struct nfs4_ds_server *
  57nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  58{
  59	struct nfs4_ds_server *dss;
  60
  61	rcu_read_lock();
  62	list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
  63		if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  64			continue;
  65		goto out;
  66	}
  67	dss = NULL;
  68out:
  69	rcu_read_unlock();
  70	return dss;
  71}
  72
  73static struct nfs4_ds_server *
  74nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
  75			   struct nfs4_ds_server *new)
  76{
  77	struct nfs4_ds_server *dss;
  78
  79	spin_lock(&ds_clp->cl_lock);
  80	list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
  81		if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  82			continue;
  83		goto out;
  84	}
  85	if (new)
  86		list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
  87	dss = new;
  88out:
  89	spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
  90	return dss;
  91}
  92
  93static struct nfs4_ds_server *
  94nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  95{
  96	struct nfs4_ds_server *dss;
  97
  98	dss = kmalloc(sizeof(*dss), GFP_NOFS);
  99	if (dss == NULL)
 100		return ERR_PTR(-ENOMEM);
 101
 102	dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
 103	if (IS_ERR(dss->rpc_clnt)) {
 104		int err = PTR_ERR(dss->rpc_clnt);
 105		kfree (dss);
 106		return ERR_PTR(err);
 107	}
 108	INIT_LIST_HEAD(&dss->list);
 109
 110	return dss;
 111}
 112
 113static void
 114nfs4_free_ds_server(struct nfs4_ds_server *dss)
 115{
 116	rpc_release_client(dss->rpc_clnt);
 117	kfree(dss);
 118}
 119
 120/**
 121* Find or create a DS rpc client with th MDS server rpc client auth flavor
 122* in the nfs_client cl_ds_clients list.
 123*/
 124struct rpc_clnt *
 125nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
 126{
 127	struct nfs4_ds_server *dss, *new;
 128	rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
 129
 130	dss = nfs4_find_ds_client(ds_clp, flavor);
 131	if (dss != NULL)
 132		goto out;
 133	new = nfs4_alloc_ds_server(ds_clp, flavor);
 134	if (IS_ERR(new))
 135		return ERR_CAST(new);
 136	dss = nfs4_add_ds_client(ds_clp, flavor, new);
 137	if (dss != new)
 138		nfs4_free_ds_server(new);
 139out:
 140	return dss->rpc_clnt;
 141}
 142EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
 143
 144static void
 145nfs4_shutdown_ds_clients(struct nfs_client *clp)
 146{
 147	struct nfs4_ds_server *dss;
 148	LIST_HEAD(shutdown_list);
 149
 150	while (!list_empty(&clp->cl_ds_clients)) {
 151		dss = list_entry(clp->cl_ds_clients.next,
 152					struct nfs4_ds_server, list);
 153		list_del(&dss->list);
 154		rpc_shutdown_client(dss->rpc_clnt);
 155		kfree (dss);
 156	}
 157}
 158
 159void nfs41_shutdown_client(struct nfs_client *clp)
 160{
 161	if (nfs4_has_session(clp)) {
 162		nfs4_shutdown_ds_clients(clp);
 163		nfs4_destroy_session(clp->cl_session);
 164		nfs4_destroy_clientid(clp);
 165	}
 166
 167}
 168#endif	/* CONFIG_NFS_V4_1 */
 169
 170void nfs40_shutdown_client(struct nfs_client *clp)
 171{
 172	if (clp->cl_slot_tbl) {
 173		nfs4_shutdown_slot_table(clp->cl_slot_tbl);
 174		kfree(clp->cl_slot_tbl);
 175	}
 176}
 177
 178struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
 179{
 180	int err;
 181	struct nfs_client *clp = nfs_alloc_client(cl_init);
 182	if (IS_ERR(clp))
 183		return clp;
 184
 185	err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
 186	if (err)
 187		goto error;
 188
 189	if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
 190		err = -EINVAL;
 191		goto error;
 192	}
 193
 194	spin_lock_init(&clp->cl_lock);
 195	INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
 196	INIT_LIST_HEAD(&clp->cl_ds_clients);
 197	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
 198	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 199	clp->cl_minorversion = cl_init->minorversion;
 200	clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
 201	clp->cl_mig_gen = 1;
 202#if IS_ENABLED(CONFIG_NFS_V4_1)
 203	init_waitqueue_head(&clp->cl_lock_waitq);
 204#endif
 205	return clp;
 206
 207error:
 208	nfs_free_client(clp);
 209	return ERR_PTR(err);
 210}
 211
 212/*
 213 * Destroy the NFS4 callback service
 214 */
 215static void nfs4_destroy_callback(struct nfs_client *clp)
 216{
 217	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 218		nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
 219}
 220
 221static void nfs4_shutdown_client(struct nfs_client *clp)
 222{
 223	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
 224		nfs4_kill_renewd(clp);
 225	clp->cl_mvops->shutdown_client(clp);
 226	nfs4_destroy_callback(clp);
 227	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 228		nfs_idmap_delete(clp);
 229
 230	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 231	kfree(clp->cl_serverowner);
 232	kfree(clp->cl_serverscope);
 233	kfree(clp->cl_implid);
 234	kfree(clp->cl_owner_id);
 235}
 236
 237void nfs4_free_client(struct nfs_client *clp)
 238{
 239	nfs4_shutdown_client(clp);
 240	nfs_free_client(clp);
 241}
 242
 243/*
 244 * Initialize the NFS4 callback service
 245 */
 246static int nfs4_init_callback(struct nfs_client *clp)
 247{
 248	struct rpc_xprt *xprt;
 249	int error;
 250
 251	xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 
 252
 253	if (nfs4_has_session(clp)) {
 254		error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
 255		if (error < 0)
 256			return error;
 257	}
 258
 259	error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 260	if (error < 0) {
 261		dprintk("%s: failed to start callback. Error = %d\n",
 262			__func__, error);
 263		return error;
 264	}
 265	__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 266
 
 
 
 
 
 
 
 
 267	return 0;
 268}
 269
 270/**
 271 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
 272 * @clp - nfs_client to initialize
 273 *
 274 * Returns zero on success, or a negative errno if some error occurred.
 275 */
 276int nfs40_init_client(struct nfs_client *clp)
 277{
 278	struct nfs4_slot_table *tbl;
 279	int ret;
 280
 281	tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
 282	if (tbl == NULL)
 283		return -ENOMEM;
 284
 285	ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
 286					"NFSv4.0 transport Slot table");
 287	if (ret) {
 288		kfree(tbl);
 289		return ret;
 290	}
 291
 292	clp->cl_slot_tbl = tbl;
 293	return 0;
 294}
 295
 296#if defined(CONFIG_NFS_V4_1)
 297
 298/**
 299 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
 300 * @clp - nfs_client to initialize
 301 *
 302 * Returns zero on success, or a negative errno if some error occurred.
 303 */
 304int nfs41_init_client(struct nfs_client *clp)
 305{
 306	struct nfs4_session *session = NULL;
 307
 308	/*
 309	 * Create the session and mark it expired.
 310	 * When a SEQUENCE operation encounters the expired session
 311	 * it will do session recovery to initialize it.
 312	 */
 313	session = nfs4_alloc_session(clp);
 314	if (!session)
 315		return -ENOMEM;
 316
 317	clp->cl_session = session;
 318
 319	/*
 320	 * The create session reply races with the server back
 321	 * channel probe. Mark the client NFS_CS_SESSION_INITING
 322	 * so that the client back channel can find the
 323	 * nfs_client struct
 324	 */
 325	nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 326	return 0;
 327}
 328
 329#endif	/* CONFIG_NFS_V4_1 */
 330
 331/*
 332 * Initialize the minor version specific parts of an NFS4 client record
 333 */
 334static int nfs4_init_client_minor_version(struct nfs_client *clp)
 335{
 336	int ret;
 337
 338	ret = clp->cl_mvops->init_client(clp);
 339	if (ret)
 340		return ret;
 341	return nfs4_init_callback(clp);
 342}
 343
 344/**
 345 * nfs4_init_client - Initialise an NFS4 client record
 346 *
 347 * @clp: nfs_client to initialise
 348 * @timeparms: timeout parameters for underlying RPC transport
 349 * @ip_addr: callback IP address in presentation format
 350 * @authflavor: authentication flavor for underlying RPC transport
 351 *
 352 * Returns pointer to an NFS client, or an ERR_PTR value.
 353 */
 354struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 355				    const struct nfs_client_initdata *cl_init)
 
 356{
 357	char buf[INET6_ADDRSTRLEN + 1];
 358	const char *ip_addr = cl_init->ip_addr;
 359	struct nfs_client *old;
 360	int error;
 361
 362	if (clp->cl_cons_state == NFS_CS_READY)
 363		/* the client is initialised already */
 
 364		return clp;
 
 365
 366	/* Check NFS protocol revision and initialize RPC op vector */
 367	clp->rpc_ops = &nfs_v4_clientops;
 368
 369	if (clp->cl_minorversion != 0)
 370		__set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 371	__set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 372	__set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
 373
 374	error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
 375	if (error == -EINVAL)
 376		error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
 377	if (error < 0)
 378		goto error;
 379
 380	/* If no clientaddr= option was specified, find a usable cb address */
 381	if (ip_addr == NULL) {
 382		struct sockaddr_storage cb_addr;
 383		struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 384
 385		error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 386		if (error < 0)
 387			goto error;
 388		error = rpc_ntop(sap, buf, sizeof(buf));
 389		if (error < 0)
 390			goto error;
 391		ip_addr = (const char *)buf;
 392	}
 393	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 394
 395	error = nfs_idmap_new(clp);
 396	if (error < 0) {
 397		dprintk("%s: failed to create idmapper. Error = %d\n",
 398			__func__, error);
 399		goto error;
 400	}
 401	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 402
 403	error = nfs4_init_client_minor_version(clp);
 404	if (error < 0)
 405		goto error;
 406
 
 
 
 407	error = nfs4_discover_server_trunking(clp, &old);
 408	if (error < 0)
 409		goto error;
 410
 411	if (clp != old) {
 412		clp->cl_preserve_clid = true;
 413		/*
 414		 * Mark the client as having failed initialization so other
 415		 * processes walking the nfs_client_list in nfs_match_client()
 416		 * won't try to use it.
 417		 */
 418		nfs_mark_client_ready(clp, -EPERM);
 419	}
 420	nfs_put_client(clp);
 421	clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
 422	return old;
 423
 424error:
 425	nfs_mark_client_ready(clp, error);
 426	nfs_put_client(clp);
 
 427	return ERR_PTR(error);
 428}
 429
 430/*
 431 * SETCLIENTID just did a callback update with the callback ident in
 432 * "drop," but server trunking discovery claims "drop" and "keep" are
 433 * actually the same server.  Swap the callback IDs so that "keep"
 434 * will continue to use the callback ident the server now knows about,
 435 * and so that "keep"'s original callback ident is destroyed when
 436 * "drop" is freed.
 437 */
 438static void nfs4_swap_callback_idents(struct nfs_client *keep,
 439				      struct nfs_client *drop)
 440{
 441	struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 442	unsigned int save = keep->cl_cb_ident;
 443
 444	if (keep->cl_cb_ident == drop->cl_cb_ident)
 445		return;
 446
 447	dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 448		__func__, keep->cl_cb_ident, drop->cl_cb_ident);
 449
 450	spin_lock(&nn->nfs_client_lock);
 451
 452	idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 453	keep->cl_cb_ident = drop->cl_cb_ident;
 454
 455	idr_replace(&nn->cb_ident_idr, drop, save);
 456	drop->cl_cb_ident = save;
 457
 458	spin_unlock(&nn->nfs_client_lock);
 459}
 460
 461static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
 462		const struct nfs_client *clp2)
 463{
 464	if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
 465		return true;
 466	return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
 467}
 468
 469static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
 470{
 471	return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
 472}
 473
 474static int nfs4_match_client(struct nfs_client  *pos,  struct nfs_client *new,
 475			     struct nfs_client **prev, struct nfs_net *nn)
 476{
 477	int status;
 478
 479	if (pos->rpc_ops != new->rpc_ops)
 480		return 1;
 481
 482	if (pos->cl_minorversion != new->cl_minorversion)
 483		return 1;
 484
 485	/* If "pos" isn't marked ready, we can't trust the
 486	 * remaining fields in "pos", especially the client
 487	 * ID and serverowner fields.  Wait for CREATE_SESSION
 488	 * to finish. */
 489	if (pos->cl_cons_state > NFS_CS_READY) {
 490		refcount_inc(&pos->cl_count);
 491		spin_unlock(&nn->nfs_client_lock);
 492
 493		nfs_put_client(*prev);
 494		*prev = pos;
 495
 496		status = nfs_wait_client_init_complete(pos);
 497		spin_lock(&nn->nfs_client_lock);
 498
 499		if (status < 0)
 500			return status;
 501	}
 502
 503	if (pos->cl_cons_state != NFS_CS_READY)
 504		return 1;
 505
 506	if (pos->cl_clientid != new->cl_clientid)
 507		return 1;
 508
 509	/* NFSv4.1 always uses the uniform string, however someone
 510	 * might switch the uniquifier string on us.
 511	 */
 512	if (!nfs4_match_client_owner_id(pos, new))
 513		return 1;
 514
 515	return 0;
 516}
 517
 518/**
 519 * nfs40_walk_client_list - Find server that recognizes a client ID
 520 *
 521 * @new: nfs_client with client ID to test
 522 * @result: OUT: found nfs_client, or new
 523 * @cred: credential to use for trunking test
 524 *
 525 * Returns zero, a negative errno, or a negative NFS4ERR status.
 526 * If zero is returned, an nfs_client pointer is planted in "result."
 527 *
 528 * NB: nfs40_walk_client_list() relies on the new nfs_client being
 529 *     the last nfs_client on the list.
 530 */
 531int nfs40_walk_client_list(struct nfs_client *new,
 532			   struct nfs_client **result,
 533			   struct rpc_cred *cred)
 534{
 535	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 536	struct nfs_client *pos, *prev = NULL;
 537	struct nfs4_setclientid_res clid = {
 538		.clientid	= new->cl_clientid,
 539		.confirm	= new->cl_confirm,
 540	};
 541	int status = -NFS4ERR_STALE_CLIENTID;
 542
 543	spin_lock(&nn->nfs_client_lock);
 544	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 545
 546		if (pos == new)
 547			goto found;
 
 
 
 548
 549		status = nfs4_match_client(pos, new, &prev, nn);
 550		if (status < 0)
 551			goto out_unlock;
 552		if (status != 0)
 553			continue;
 554		/*
 555		 * We just sent a new SETCLIENTID, which should have
 556		 * caused the server to return a new cl_confirm.  So if
 557		 * cl_confirm is the same, then this is a different
 558		 * server that just returned the same cl_confirm by
 559		 * coincidence:
 560		 */
 561		if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
 562						       &new->cl_confirm))
 563			continue;
 564		/*
 565		 * But if the cl_confirm's are different, then the only
 566		 * way that a SETCLIENTID_CONFIRM to pos can succeed is
 567		 * if new and pos point to the same server:
 568		 */
 569found:
 570		refcount_inc(&pos->cl_count);
 571		spin_unlock(&nn->nfs_client_lock);
 572
 573		nfs_put_client(prev);
 
 574		prev = pos;
 575
 576		status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 577		switch (status) {
 578		case -NFS4ERR_STALE_CLIENTID:
 579			break;
 580		case 0:
 581			nfs4_swap_callback_idents(pos, new);
 582			pos->cl_confirm = new->cl_confirm;
 583			nfs_mark_client_ready(pos, NFS_CS_READY);
 584
 585			prev = NULL;
 586			*result = pos;
 
 
 587			goto out;
 588		case -ERESTARTSYS:
 589		case -ETIMEDOUT:
 590			/* The callback path may have been inadvertently
 591			 * changed. Schedule recovery!
 592			 */
 593			nfs4_schedule_path_down_recovery(pos);
 594		default:
 595			goto out;
 596		}
 597
 598		spin_lock(&nn->nfs_client_lock);
 599	}
 600out_unlock:
 601	spin_unlock(&nn->nfs_client_lock);
 602
 603	/* No match found. The server lost our clientid */
 604out:
 605	nfs_put_client(prev);
 
 
 606	return status;
 607}
 608
 609#ifdef CONFIG_NFS_V4_1
 610/*
 611 * Returns true if the server major ids match
 612 */
 613static bool
 614nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 615				struct nfs41_server_owner *o2)
 616{
 617	if (o1->major_id_sz != o2->major_id_sz)
 
 
 618		return false;
 619	return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
 
 
 
 620}
 621
 622/*
 623 * Returns true if the server scopes match
 624 */
 625static bool
 626nfs4_check_server_scope(struct nfs41_server_scope *s1,
 627			struct nfs41_server_scope *s2)
 628{
 629	if (s1->server_scope_sz != s2->server_scope_sz)
 630		return false;
 631	return memcmp(s1->server_scope, s2->server_scope,
 632					s1->server_scope_sz) == 0;
 633}
 634
 635/**
 636 * nfs4_detect_session_trunking - Checks for session trunking.
 637 *
 638 * Called after a successful EXCHANGE_ID on a multi-addr connection.
 639 * Upon success, add the transport.
 640 *
 641 * @clp:    original mount nfs_client
 642 * @res:    result structure from an exchange_id using the original mount
 643 *          nfs_client with a new multi_addr transport
 644 *
 645 * Returns zero on success, otherwise -EINVAL
 646 *
 647 * Note: since the exchange_id for the new multi_addr transport uses the
 648 * same nfs_client from the original mount, the cl_owner_id is reused,
 649 * so eir_clientowner is the same.
 650 */
 651int nfs4_detect_session_trunking(struct nfs_client *clp,
 652				 struct nfs41_exchange_id_res *res,
 653				 struct rpc_xprt *xprt)
 654{
 655	/* Check eir_clientid */
 656	if (clp->cl_clientid != res->clientid)
 657		goto out_err;
 658
 659	/* Check eir_server_owner so_major_id */
 660	if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
 661					     res->server_owner))
 662		goto out_err;
 663
 664	/* Check eir_server_owner so_minor_id */
 665	if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
 666		goto out_err;
 667
 668	/* Check eir_server_scope */
 669	if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
 670		goto out_err;
 671
 672	pr_info("NFS:  %s: Session trunking succeeded for %s\n",
 673		clp->cl_hostname,
 674		xprt->address_strings[RPC_DISPLAY_ADDR]);
 675
 676	return 0;
 677out_err:
 678	pr_info("NFS:  %s: Session trunking failed for %s\n", clp->cl_hostname,
 679		xprt->address_strings[RPC_DISPLAY_ADDR]);
 
 680
 681	return -EINVAL;
 
 
 
 
 
 
 
 
 
 
 
 682}
 683
 684/**
 685 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 686 *
 687 * @new: nfs_client with client ID to test
 688 * @result: OUT: found nfs_client, or new
 689 * @cred: credential to use for trunking test
 690 *
 691 * Returns zero, a negative errno, or a negative NFS4ERR status.
 692 * If zero is returned, an nfs_client pointer is planted in "result."
 693 *
 694 * NB: nfs41_walk_client_list() relies on the new nfs_client being
 695 *     the last nfs_client on the list.
 696 */
 697int nfs41_walk_client_list(struct nfs_client *new,
 698			   struct nfs_client **result,
 699			   struct rpc_cred *cred)
 700{
 701	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 702	struct nfs_client *pos, *prev = NULL;
 703	int status = -NFS4ERR_STALE_CLIENTID;
 704
 705	spin_lock(&nn->nfs_client_lock);
 706	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 707
 708		if (pos == new)
 709			goto found;
 710
 711		status = nfs4_match_client(pos, new, &prev, nn);
 712		if (status < 0)
 713			goto out;
 714		if (status != 0)
 715			continue;
 716
 717		/*
 718		 * Note that session trunking is just a special subcase of
 719		 * client id trunking. In either case, we want to fall back
 720		 * to using the existing nfs_client.
 721		 */
 722		if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
 723						     new->cl_serverowner))
 724			continue;
 725
 726found:
 727		refcount_inc(&pos->cl_count);
 
 
 728		*result = pos;
 729		status = 0;
 
 
 730		break;
 731	}
 732
 733out:
 734	spin_unlock(&nn->nfs_client_lock);
 735	nfs_put_client(prev);
 
 
 736	return status;
 737}
 738#endif	/* CONFIG_NFS_V4_1 */
 739
 740static void nfs4_destroy_server(struct nfs_server *server)
 741{
 742	nfs_server_return_all_delegations(server);
 743	unset_pnfs_layoutdriver(server);
 744	nfs4_purge_state_owners(server);
 745}
 746
 747/*
 748 * NFSv4.0 callback thread helper
 749 *
 750 * Find a client by callback identifier
 751 */
 752struct nfs_client *
 753nfs4_find_client_ident(struct net *net, int cb_ident)
 754{
 755	struct nfs_client *clp;
 756	struct nfs_net *nn = net_generic(net, nfs_net_id);
 757
 758	spin_lock(&nn->nfs_client_lock);
 759	clp = idr_find(&nn->cb_ident_idr, cb_ident);
 760	if (clp)
 761		refcount_inc(&clp->cl_count);
 762	spin_unlock(&nn->nfs_client_lock);
 763	return clp;
 764}
 765
 766#if defined(CONFIG_NFS_V4_1)
 767/* Common match routine for v4.0 and v4.1 callback services */
 768static bool nfs4_cb_match_client(const struct sockaddr *addr,
 769		struct nfs_client *clp, u32 minorversion)
 770{
 771	struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 772
 773	/* Don't match clients that failed to initialise */
 774	if (!(clp->cl_cons_state == NFS_CS_READY ||
 775	    clp->cl_cons_state == NFS_CS_SESSION_INITING))
 776		return false;
 777
 778	smp_rmb();
 779
 780	/* Match the version and minorversion */
 781	if (clp->rpc_ops->version != 4 ||
 782	    clp->cl_minorversion != minorversion)
 783		return false;
 784
 785	/* Match only the IP address, not the port number */
 786	return rpc_cmp_addr(addr, clap);
 
 
 
 787}
 788
 789/*
 790 * NFSv4.1 callback thread helper
 791 * For CB_COMPOUND calls, find a client by IP address, protocol version,
 792 * minorversion, and sessionID
 793 *
 794 * Returns NULL if no such client
 795 */
 796struct nfs_client *
 797nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 798			   struct nfs4_sessionid *sid, u32 minorversion)
 799{
 800	struct nfs_client *clp;
 801	struct nfs_net *nn = net_generic(net, nfs_net_id);
 802
 803	spin_lock(&nn->nfs_client_lock);
 804	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 805		if (!nfs4_cb_match_client(addr, clp, minorversion))
 806			continue;
 807
 808		if (!nfs4_has_session(clp))
 809			continue;
 810
 811		/* Match sessionid*/
 812		if (memcmp(clp->cl_session->sess_id.data,
 813		    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 814			continue;
 815
 816		refcount_inc(&clp->cl_count);
 817		spin_unlock(&nn->nfs_client_lock);
 818		return clp;
 819	}
 820	spin_unlock(&nn->nfs_client_lock);
 821	return NULL;
 822}
 823
 824#else /* CONFIG_NFS_V4_1 */
 825
 826struct nfs_client *
 827nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 828			   struct nfs4_sessionid *sid, u32 minorversion)
 829{
 830	return NULL;
 831}
 832#endif /* CONFIG_NFS_V4_1 */
 833
 834/*
 835 * Set up an NFS4 client
 836 */
 837static int nfs4_set_client(struct nfs_server *server,
 838		const char *hostname,
 839		const struct sockaddr *addr,
 840		const size_t addrlen,
 841		const char *ip_addr,
 
 842		int proto, const struct rpc_timeout *timeparms,
 843		u32 minorversion, struct net *net)
 844{
 845	struct nfs_client_initdata cl_init = {
 846		.hostname = hostname,
 847		.addr = addr,
 848		.addrlen = addrlen,
 849		.ip_addr = ip_addr,
 850		.nfs_mod = &nfs_v4,
 851		.proto = proto,
 852		.minorversion = minorversion,
 853		.net = net,
 854		.timeparms = timeparms,
 855	};
 856	struct nfs_client *clp;
 
 
 
 857
 858	if (server->flags & NFS_MOUNT_NORESVPORT)
 859		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 860	if (server->options & NFS_OPTION_MIGRATION)
 861		set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 862	if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
 863		set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
 864	server->port = rpc_get_port(addr);
 865
 866	/* Allocate or find a client reference we can use */
 867	clp = nfs_get_client(&cl_init);
 868	if (IS_ERR(clp))
 869		return PTR_ERR(clp);
 870
 871	if (server->nfs_client == clp) {
 872		nfs_put_client(clp);
 873		return -ELOOP;
 874	}
 875
 876	/*
 877	 * Query for the lease time on clientid setup or renewal
 878	 *
 879	 * Note that this will be set on nfs_clients that were created
 880	 * only for the DS role and did not set this bit, but now will
 881	 * serve a dual role.
 882	 */
 883	set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 884
 885	server->nfs_client = clp;
 
 886	return 0;
 
 
 
 887}
 888
 889/*
 890 * Set up a pNFS Data Server client.
 891 *
 892 * Return any existing nfs_client that matches server address,port,version
 893 * and minorversion.
 894 *
 895 * For a new nfs_client, use a soft mount (default), a low retrans and a
 896 * low timeout interval so that if a connection is lost, we retry through
 897 * the MDS.
 898 */
 899struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 900		const struct sockaddr *ds_addr, int ds_addrlen,
 901		int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
 902		u32 minor_version)
 903{
 904	struct rpc_timeout ds_timeout;
 905	struct nfs_client *mds_clp = mds_srv->nfs_client;
 906	struct nfs_client_initdata cl_init = {
 907		.addr = ds_addr,
 908		.addrlen = ds_addrlen,
 909		.nodename = mds_clp->cl_rpcclient->cl_nodename,
 910		.ip_addr = mds_clp->cl_ipaddr,
 911		.nfs_mod = &nfs_v4,
 912		.proto = ds_proto,
 913		.minorversion = minor_version,
 914		.net = mds_clp->cl_net,
 915		.timeparms = &ds_timeout,
 916	};
 917	char buf[INET6_ADDRSTRLEN + 1];
 918
 919	if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
 920		return ERR_PTR(-EINVAL);
 921	cl_init.hostname = buf;
 922
 923	if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
 924		__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 925
 926	/*
 927	 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 928	 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 929	 * (section 13.1 RFC 5661).
 930	 */
 931	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 932	return nfs_get_client(&cl_init);
 
 
 
 
 933}
 934EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 935
 936/*
 937 * Session has been established, and the client marked ready.
 938 * Set the mount rsize and wsize with negotiated fore channel
 939 * attributes which will be bound checked in nfs_server_set_fsinfo.
 940 */
 941static void nfs4_session_set_rwsize(struct nfs_server *server)
 942{
 943#ifdef CONFIG_NFS_V4_1
 944	struct nfs4_session *sess;
 945	u32 server_resp_sz;
 946	u32 server_rqst_sz;
 947
 948	if (!nfs4_has_session(server->nfs_client))
 949		return;
 950	sess = server->nfs_client->cl_session;
 951	server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 952	server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 953
 954	if (!server->rsize || server->rsize > server_resp_sz)
 955		server->rsize = server_resp_sz;
 956	if (!server->wsize || server->wsize > server_rqst_sz)
 957		server->wsize = server_rqst_sz;
 958#endif /* CONFIG_NFS_V4_1 */
 959}
 960
 961static int nfs4_server_common_setup(struct nfs_server *server,
 962		struct nfs_fh *mntfh, bool auth_probe)
 963{
 964	struct nfs_fattr *fattr;
 965	int error;
 966
 967	/* data servers support only a subset of NFSv4.1 */
 968	if (is_ds_only_client(server->nfs_client))
 969		return -EPROTONOSUPPORT;
 970
 971	fattr = nfs_alloc_fattr();
 972	if (fattr == NULL)
 973		return -ENOMEM;
 974
 975	/* We must ensure the session is initialised first */
 976	error = nfs4_init_session(server->nfs_client);
 977	if (error < 0)
 978		goto out;
 979
 980	/* Set the basic capabilities */
 981	server->caps |= server->nfs_client->cl_mvops->init_caps;
 982	if (server->flags & NFS_MOUNT_NORDIRPLUS)
 983			server->caps &= ~NFS_CAP_READDIRPLUS;
 984	/*
 985	 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 986	 * authentication.
 987	 */
 988	if (nfs4_disable_idmapping &&
 989			server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
 990		server->caps |= NFS_CAP_UIDGID_NOMAP;
 991
 992
 993	/* Probe the root fh to retrieve its FSID and filehandle */
 994	error = nfs4_get_rootfh(server, mntfh, auth_probe);
 995	if (error < 0)
 996		goto out;
 997
 998	dprintk("Server FSID: %llx:%llx\n",
 999			(unsigned long long) server->fsid.major,
1000			(unsigned long long) server->fsid.minor);
1001	nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1002
1003	nfs4_session_set_rwsize(server);
1004
1005	error = nfs_probe_fsinfo(server, mntfh, fattr);
1006	if (error < 0)
1007		goto out;
1008
1009	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1010		server->namelen = NFS4_MAXNAMLEN;
1011
1012	nfs_server_insert_lists(server);
1013	server->mount_time = jiffies;
1014	server->destroy = nfs4_destroy_server;
1015out:
1016	nfs_free_fattr(fattr);
1017	return error;
1018}
1019
1020/*
1021 * Create a version 4 volume record
1022 */
1023static int nfs4_init_server(struct nfs_server *server,
1024		struct nfs_parsed_mount_data *data)
1025{
1026	struct rpc_timeout timeparms;
1027	int error;
1028
 
 
1029	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1030			data->timeo, data->retrans);
1031
1032	/* Initialise the client representation from the mount data */
1033	server->flags = data->flags;
1034	server->options = data->options;
1035	server->auth_info = data->auth_info;
1036
1037	/* Use the first specified auth flavor. If this flavor isn't
1038	 * allowed by the server, use the SECINFO path to try the
1039	 * other specified flavors */
1040	if (data->auth_info.flavor_len >= 1)
1041		data->selected_flavor = data->auth_info.flavors[0];
1042	else
1043		data->selected_flavor = RPC_AUTH_UNIX;
1044
1045	/* Get a client record */
1046	error = nfs4_set_client(server,
1047			data->nfs_server.hostname,
1048			(const struct sockaddr *)&data->nfs_server.address,
1049			data->nfs_server.addrlen,
1050			data->client_address,
 
1051			data->nfs_server.protocol,
1052			&timeparms,
1053			data->minorversion,
1054			data->net);
1055	if (error < 0)
1056		return error;
1057
1058	if (data->rsize)
1059		server->rsize = nfs_block_size(data->rsize, NULL);
1060	if (data->wsize)
1061		server->wsize = nfs_block_size(data->wsize, NULL);
1062
1063	server->acregmin = data->acregmin * HZ;
1064	server->acregmax = data->acregmax * HZ;
1065	server->acdirmin = data->acdirmin * HZ;
1066	server->acdirmax = data->acdirmax * HZ;
1067	server->port     = data->nfs_server.port;
1068
1069	return nfs_init_server_rpcclient(server, &timeparms,
1070					 data->selected_flavor);
 
 
 
 
 
 
 
1071}
1072
1073/*
1074 * Create a version 4 volume record
1075 * - keyed on server and FSID
1076 */
1077/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1078				      struct nfs_fh *mntfh)*/
1079struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1080				      struct nfs_subversion *nfs_mod)
1081{
1082	struct nfs_server *server;
1083	bool auth_probe;
1084	int error;
1085
 
 
1086	server = nfs_alloc_server();
1087	if (!server)
1088		return ERR_PTR(-ENOMEM);
1089
1090	auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1091
1092	/* set up the general RPC client */
1093	error = nfs4_init_server(server, mount_info->parsed);
1094	if (error < 0)
1095		goto error;
1096
1097	error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1098	if (error < 0)
1099		goto error;
1100
 
1101	return server;
1102
1103error:
1104	nfs_free_server(server);
 
1105	return ERR_PTR(error);
1106}
1107
1108/*
1109 * Create an NFS4 referral server record
1110 */
1111struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1112					       struct nfs_fh *mntfh)
1113{
1114	struct nfs_client *parent_client;
1115	struct nfs_server *server, *parent_server;
1116	bool auth_probe;
1117	int error;
1118
 
 
1119	server = nfs_alloc_server();
1120	if (!server)
1121		return ERR_PTR(-ENOMEM);
1122
1123	parent_server = NFS_SB(data->sb);
1124	parent_client = parent_server->nfs_client;
1125
1126	/* Initialise the client representation from the parent server */
1127	nfs_server_copy_userdata(server, parent_server);
1128
1129	/* Get a client representation */
1130#ifdef CONFIG_SUNRPC_XPRT_RDMA
1131	rpc_set_port(data->addr, NFS_RDMA_PORT);
1132	error = nfs4_set_client(server, data->hostname,
1133				data->addr,
1134				data->addrlen,
1135				parent_client->cl_ipaddr,
1136				XPRT_TRANSPORT_RDMA,
1137				parent_server->client->cl_timeout,
1138				parent_client->cl_mvops->minor_version,
1139				parent_client->cl_net);
1140	if (!error)
1141		goto init_server;
1142#endif	/* CONFIG_SUNRPC_XPRT_RDMA */
1143
1144	rpc_set_port(data->addr, NFS_PORT);
1145	error = nfs4_set_client(server, data->hostname,
1146				data->addr,
1147				data->addrlen,
1148				parent_client->cl_ipaddr,
1149				XPRT_TRANSPORT_TCP,
 
1150				parent_server->client->cl_timeout,
1151				parent_client->cl_mvops->minor_version,
1152				parent_client->cl_net);
1153	if (error < 0)
1154		goto error;
1155
1156#ifdef CONFIG_SUNRPC_XPRT_RDMA
1157init_server:
1158#endif
1159	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1160	if (error < 0)
1161		goto error;
1162
1163	auth_probe = parent_server->auth_info.flavor_len < 1;
1164
1165	error = nfs4_server_common_setup(server, mntfh, auth_probe);
1166	if (error < 0)
1167		goto error;
1168
 
1169	return server;
1170
1171error:
1172	nfs_free_server(server);
 
1173	return ERR_PTR(error);
1174}
1175
1176/*
1177 * Grab the destination's particulars, including lease expiry time.
1178 *
1179 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1180 * we have cached.
1181 */
1182static int nfs_probe_destination(struct nfs_server *server)
1183{
1184	struct inode *inode = d_inode(server->super->s_root);
1185	struct nfs_fattr *fattr;
1186	int error;
1187
1188	fattr = nfs_alloc_fattr();
1189	if (fattr == NULL)
1190		return -ENOMEM;
1191
1192	/* Sanity: the probe won't work if the destination server
1193	 * does not recognize the migrated FH. */
1194	error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1195
1196	nfs_free_fattr(fattr);
1197	return error;
1198}
1199
1200/**
1201 * nfs4_update_server - Move an nfs_server to a different nfs_client
1202 *
1203 * @server: represents FSID to be moved
1204 * @hostname: new end-point's hostname
1205 * @sap: new end-point's socket address
1206 * @salen: size of "sap"
1207 * @net: net namespace
1208 *
1209 * The nfs_server must be quiescent before this function is invoked.
1210 * Either its session is drained (NFSv4.1+), or its transport is
1211 * plugged and drained (NFSv4.0).
1212 *
1213 * Returns zero on success, or a negative errno value.
1214 */
1215int nfs4_update_server(struct nfs_server *server, const char *hostname,
1216		       struct sockaddr *sap, size_t salen, struct net *net)
1217{
1218	struct nfs_client *clp = server->nfs_client;
1219	struct rpc_clnt *clnt = server->client;
1220	struct xprt_create xargs = {
1221		.ident		= clp->cl_proto,
1222		.net		= net,
1223		.dstaddr	= sap,
1224		.addrlen	= salen,
1225		.servername	= hostname,
1226	};
1227	char buf[INET6_ADDRSTRLEN + 1];
1228	struct sockaddr_storage address;
1229	struct sockaddr *localaddr = (struct sockaddr *)&address;
1230	int error;
1231
 
 
 
 
 
1232	error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1233	if (error != 0)
1234		return error;
 
 
 
1235
1236	error = rpc_localaddr(clnt, localaddr, sizeof(address));
1237	if (error != 0)
1238		return error;
 
 
 
1239
1240	if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1241		return -EAFNOSUPPORT;
 
 
 
 
1242
1243	nfs_server_remove_lists(server);
1244	set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1245	error = nfs4_set_client(server, hostname, sap, salen, buf,
 
1246				clp->cl_proto, clnt->cl_timeout,
1247				clp->cl_minorversion, net);
1248	clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1249	if (error != 0) {
1250		nfs_server_insert_lists(server);
1251		return error;
 
 
1252	}
1253	nfs_put_client(clp);
1254
1255	if (server->nfs_client->cl_hostname == NULL)
1256		server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1257	nfs_server_insert_lists(server);
1258
1259	return nfs_probe_destination(server);
 
 
 
 
 
 
 
1260}
v3.15
   1/*
   2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   3 * Written by David Howells (dhowells@redhat.com)
   4 */
   5#include <linux/module.h>
   6#include <linux/nfs_fs.h>
   7#include <linux/nfs_idmap.h>
   8#include <linux/nfs_mount.h>
   9#include <linux/sunrpc/addr.h>
  10#include <linux/sunrpc/auth.h>
  11#include <linux/sunrpc/xprt.h>
  12#include <linux/sunrpc/bc_xprt.h>
  13#include <linux/sunrpc/rpc_pipe_fs.h>
  14#include "internal.h"
  15#include "callback.h"
  16#include "delegation.h"
  17#include "nfs4session.h"
 
  18#include "pnfs.h"
  19#include "netns.h"
  20
  21#define NFSDBG_FACILITY		NFSDBG_CLIENT
  22
  23/*
  24 * Get a unique NFSv4.0 callback identifier which will be used
  25 * by the V4.0 callback service to lookup the nfs_client struct
  26 */
  27static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  28{
  29	int ret = 0;
  30	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  31
  32	if (clp->rpc_ops->version != 4 || minorversion != 0)
  33		return ret;
  34	idr_preload(GFP_KERNEL);
  35	spin_lock(&nn->nfs_client_lock);
  36	ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
  37	if (ret >= 0)
  38		clp->cl_cb_ident = ret;
  39	spin_unlock(&nn->nfs_client_lock);
  40	idr_preload_end();
  41	return ret < 0 ? ret : 0;
  42}
  43
  44#ifdef CONFIG_NFS_V4_1
  45/**
  46 * Per auth flavor data server rpc clients
  47 */
  48struct nfs4_ds_server {
  49	struct list_head	list;   /* ds_clp->cl_ds_clients */
  50	struct rpc_clnt		*rpc_clnt;
  51};
  52
  53/**
  54 * Common lookup case for DS I/O
  55 */
  56static struct nfs4_ds_server *
  57nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  58{
  59	struct nfs4_ds_server *dss;
  60
  61	rcu_read_lock();
  62	list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
  63		if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  64			continue;
  65		goto out;
  66	}
  67	dss = NULL;
  68out:
  69	rcu_read_unlock();
  70	return dss;
  71}
  72
  73static struct nfs4_ds_server *
  74nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
  75			   struct nfs4_ds_server *new)
  76{
  77	struct nfs4_ds_server *dss;
  78
  79	spin_lock(&ds_clp->cl_lock);
  80	list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
  81		if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  82			continue;
  83		goto out;
  84	}
  85	if (new)
  86		list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
  87	dss = new;
  88out:
  89	spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
  90	return dss;
  91}
  92
  93static struct nfs4_ds_server *
  94nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  95{
  96	struct nfs4_ds_server *dss;
  97
  98	dss = kmalloc(sizeof(*dss), GFP_NOFS);
  99	if (dss == NULL)
 100		return ERR_PTR(-ENOMEM);
 101
 102	dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
 103	if (IS_ERR(dss->rpc_clnt)) {
 104		int err = PTR_ERR(dss->rpc_clnt);
 105		kfree (dss);
 106		return ERR_PTR(err);
 107	}
 108	INIT_LIST_HEAD(&dss->list);
 109
 110	return dss;
 111}
 112
 113static void
 114nfs4_free_ds_server(struct nfs4_ds_server *dss)
 115{
 116	rpc_release_client(dss->rpc_clnt);
 117	kfree(dss);
 118}
 119
 120/**
 121* Find or create a DS rpc client with th MDS server rpc client auth flavor
 122* in the nfs_client cl_ds_clients list.
 123*/
 124struct rpc_clnt *
 125nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
 126{
 127	struct nfs4_ds_server *dss, *new;
 128	rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
 129
 130	dss = nfs4_find_ds_client(ds_clp, flavor);
 131	if (dss != NULL)
 132		goto out;
 133	new = nfs4_alloc_ds_server(ds_clp, flavor);
 134	if (IS_ERR(new))
 135		return ERR_CAST(new);
 136	dss = nfs4_add_ds_client(ds_clp, flavor, new);
 137	if (dss != new)
 138		nfs4_free_ds_server(new);
 139out:
 140	return dss->rpc_clnt;
 141}
 142EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
 143
 144static void
 145nfs4_shutdown_ds_clients(struct nfs_client *clp)
 146{
 147	struct nfs4_ds_server *dss;
 148	LIST_HEAD(shutdown_list);
 149
 150	while (!list_empty(&clp->cl_ds_clients)) {
 151		dss = list_entry(clp->cl_ds_clients.next,
 152					struct nfs4_ds_server, list);
 153		list_del(&dss->list);
 154		rpc_shutdown_client(dss->rpc_clnt);
 155		kfree (dss);
 156	}
 157}
 158
 159void nfs41_shutdown_client(struct nfs_client *clp)
 160{
 161	if (nfs4_has_session(clp)) {
 162		nfs4_shutdown_ds_clients(clp);
 163		nfs4_destroy_session(clp->cl_session);
 164		nfs4_destroy_clientid(clp);
 165	}
 166
 167}
 168#endif	/* CONFIG_NFS_V4_1 */
 169
 170void nfs40_shutdown_client(struct nfs_client *clp)
 171{
 172	if (clp->cl_slot_tbl) {
 173		nfs4_shutdown_slot_table(clp->cl_slot_tbl);
 174		kfree(clp->cl_slot_tbl);
 175	}
 176}
 177
 178struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
 179{
 180	int err;
 181	struct nfs_client *clp = nfs_alloc_client(cl_init);
 182	if (IS_ERR(clp))
 183		return clp;
 184
 185	err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
 186	if (err)
 187		goto error;
 188
 189	if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
 190		err = -EINVAL;
 191		goto error;
 192	}
 193
 194	spin_lock_init(&clp->cl_lock);
 195	INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
 196	INIT_LIST_HEAD(&clp->cl_ds_clients);
 197	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
 198	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 199	clp->cl_minorversion = cl_init->minorversion;
 200	clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
 201	clp->cl_mig_gen = 1;
 
 
 
 202	return clp;
 203
 204error:
 205	nfs_free_client(clp);
 206	return ERR_PTR(err);
 207}
 208
 209/*
 210 * Destroy the NFS4 callback service
 211 */
 212static void nfs4_destroy_callback(struct nfs_client *clp)
 213{
 214	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 215		nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
 216}
 217
 218static void nfs4_shutdown_client(struct nfs_client *clp)
 219{
 220	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
 221		nfs4_kill_renewd(clp);
 222	clp->cl_mvops->shutdown_client(clp);
 223	nfs4_destroy_callback(clp);
 224	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 225		nfs_idmap_delete(clp);
 226
 227	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 228	kfree(clp->cl_serverowner);
 229	kfree(clp->cl_serverscope);
 230	kfree(clp->cl_implid);
 
 231}
 232
 233void nfs4_free_client(struct nfs_client *clp)
 234{
 235	nfs4_shutdown_client(clp);
 236	nfs_free_client(clp);
 237}
 238
 239/*
 240 * Initialize the NFS4 callback service
 241 */
 242static int nfs4_init_callback(struct nfs_client *clp)
 243{
 
 244	int error;
 245
 246	if (clp->rpc_ops->version == 4) {
 247		struct rpc_xprt *xprt;
 248
 249		xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 
 
 
 
 250
 251		if (nfs4_has_session(clp)) {
 252			error = xprt_setup_backchannel(xprt,
 253						NFS41_BC_MIN_CALLBACKS);
 254			if (error < 0)
 255				return error;
 256		}
 
 257
 258		error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 259		if (error < 0) {
 260			dprintk("%s: failed to start callback. Error = %d\n",
 261				__func__, error);
 262			return error;
 263		}
 264		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 265	}
 266	return 0;
 267}
 268
 269/**
 270 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
 271 * @clp - nfs_client to initialize
 272 *
 273 * Returns zero on success, or a negative errno if some error occurred.
 274 */
 275int nfs40_init_client(struct nfs_client *clp)
 276{
 277	struct nfs4_slot_table *tbl;
 278	int ret;
 279
 280	tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
 281	if (tbl == NULL)
 282		return -ENOMEM;
 283
 284	ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
 285					"NFSv4.0 transport Slot table");
 286	if (ret) {
 287		kfree(tbl);
 288		return ret;
 289	}
 290
 291	clp->cl_slot_tbl = tbl;
 292	return 0;
 293}
 294
 295#if defined(CONFIG_NFS_V4_1)
 296
 297/**
 298 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
 299 * @clp - nfs_client to initialize
 300 *
 301 * Returns zero on success, or a negative errno if some error occurred.
 302 */
 303int nfs41_init_client(struct nfs_client *clp)
 304{
 305	struct nfs4_session *session = NULL;
 306
 307	/*
 308	 * Create the session and mark it expired.
 309	 * When a SEQUENCE operation encounters the expired session
 310	 * it will do session recovery to initialize it.
 311	 */
 312	session = nfs4_alloc_session(clp);
 313	if (!session)
 314		return -ENOMEM;
 315
 316	clp->cl_session = session;
 317
 318	/*
 319	 * The create session reply races with the server back
 320	 * channel probe. Mark the client NFS_CS_SESSION_INITING
 321	 * so that the client back channel can find the
 322	 * nfs_client struct
 323	 */
 324	nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 325	return 0;
 326}
 327
 328#endif	/* CONFIG_NFS_V4_1 */
 329
 330/*
 331 * Initialize the minor version specific parts of an NFS4 client record
 332 */
 333static int nfs4_init_client_minor_version(struct nfs_client *clp)
 334{
 335	int ret;
 336
 337	ret = clp->cl_mvops->init_client(clp);
 338	if (ret)
 339		return ret;
 340	return nfs4_init_callback(clp);
 341}
 342
 343/**
 344 * nfs4_init_client - Initialise an NFS4 client record
 345 *
 346 * @clp: nfs_client to initialise
 347 * @timeparms: timeout parameters for underlying RPC transport
 348 * @ip_addr: callback IP address in presentation format
 349 * @authflavor: authentication flavor for underlying RPC transport
 350 *
 351 * Returns pointer to an NFS client, or an ERR_PTR value.
 352 */
 353struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 354				    const struct rpc_timeout *timeparms,
 355				    const char *ip_addr)
 356{
 357	char buf[INET6_ADDRSTRLEN + 1];
 
 358	struct nfs_client *old;
 359	int error;
 360
 361	if (clp->cl_cons_state == NFS_CS_READY) {
 362		/* the client is initialised already */
 363		dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 364		return clp;
 365	}
 366
 367	/* Check NFS protocol revision and initialize RPC op vector */
 368	clp->rpc_ops = &nfs_v4_clientops;
 369
 370	if (clp->cl_minorversion != 0)
 371		__set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 372	__set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 373	__set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
 374
 375	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
 376	if (error == -EINVAL)
 377		error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
 378	if (error < 0)
 379		goto error;
 380
 381	/* If no clientaddr= option was specified, find a usable cb address */
 382	if (ip_addr == NULL) {
 383		struct sockaddr_storage cb_addr;
 384		struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 385
 386		error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 387		if (error < 0)
 388			goto error;
 389		error = rpc_ntop(sap, buf, sizeof(buf));
 390		if (error < 0)
 391			goto error;
 392		ip_addr = (const char *)buf;
 393	}
 394	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 395
 396	error = nfs_idmap_new(clp);
 397	if (error < 0) {
 398		dprintk("%s: failed to create idmapper. Error = %d\n",
 399			__func__, error);
 400		goto error;
 401	}
 402	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 403
 404	error = nfs4_init_client_minor_version(clp);
 405	if (error < 0)
 406		goto error;
 407
 408	if (!nfs4_has_session(clp))
 409		nfs_mark_client_ready(clp, NFS_CS_READY);
 410
 411	error = nfs4_discover_server_trunking(clp, &old);
 412	if (error < 0)
 413		goto error;
 414
 415	if (clp != old)
 416		clp->cl_preserve_clid = true;
 
 
 
 
 
 
 
 417	nfs_put_client(clp);
 
 418	return old;
 419
 420error:
 421	nfs_mark_client_ready(clp, error);
 422	nfs_put_client(clp);
 423	dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 424	return ERR_PTR(error);
 425}
 426
 427/*
 428 * SETCLIENTID just did a callback update with the callback ident in
 429 * "drop," but server trunking discovery claims "drop" and "keep" are
 430 * actually the same server.  Swap the callback IDs so that "keep"
 431 * will continue to use the callback ident the server now knows about,
 432 * and so that "keep"'s original callback ident is destroyed when
 433 * "drop" is freed.
 434 */
 435static void nfs4_swap_callback_idents(struct nfs_client *keep,
 436				      struct nfs_client *drop)
 437{
 438	struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 439	unsigned int save = keep->cl_cb_ident;
 440
 441	if (keep->cl_cb_ident == drop->cl_cb_ident)
 442		return;
 443
 444	dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 445		__func__, keep->cl_cb_ident, drop->cl_cb_ident);
 446
 447	spin_lock(&nn->nfs_client_lock);
 448
 449	idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 450	keep->cl_cb_ident = drop->cl_cb_ident;
 451
 452	idr_replace(&nn->cb_ident_idr, drop, save);
 453	drop->cl_cb_ident = save;
 454
 455	spin_unlock(&nn->nfs_client_lock);
 456}
 457
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 458/**
 459 * nfs40_walk_client_list - Find server that recognizes a client ID
 460 *
 461 * @new: nfs_client with client ID to test
 462 * @result: OUT: found nfs_client, or new
 463 * @cred: credential to use for trunking test
 464 *
 465 * Returns zero, a negative errno, or a negative NFS4ERR status.
 466 * If zero is returned, an nfs_client pointer is planted in "result."
 467 *
 468 * NB: nfs40_walk_client_list() relies on the new nfs_client being
 469 *     the last nfs_client on the list.
 470 */
 471int nfs40_walk_client_list(struct nfs_client *new,
 472			   struct nfs_client **result,
 473			   struct rpc_cred *cred)
 474{
 475	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 476	struct nfs_client *pos, *prev = NULL;
 477	struct nfs4_setclientid_res clid = {
 478		.clientid	= new->cl_clientid,
 479		.confirm	= new->cl_confirm,
 480	};
 481	int status = -NFS4ERR_STALE_CLIENTID;
 482
 483	spin_lock(&nn->nfs_client_lock);
 484	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 485		/* If "pos" isn't marked ready, we can't trust the
 486		 * remaining fields in "pos" */
 487		if (pos->cl_cons_state > NFS_CS_READY) {
 488			atomic_inc(&pos->cl_count);
 489			spin_unlock(&nn->nfs_client_lock);
 490
 491			if (prev)
 492				nfs_put_client(prev);
 493			prev = pos;
 494
 495			status = nfs_wait_client_init_complete(pos);
 496			if (status < 0)
 497				goto out;
 498			status = -NFS4ERR_STALE_CLIENTID;
 499			spin_lock(&nn->nfs_client_lock);
 500		}
 501		if (pos->cl_cons_state != NFS_CS_READY)
 502			continue;
 503
 504		if (pos->rpc_ops != new->rpc_ops)
 505			continue;
 506
 507		if (pos->cl_proto != new->cl_proto)
 508			continue;
 509
 510		if (pos->cl_minorversion != new->cl_minorversion)
 
 
 
 511			continue;
 512
 513		if (pos->cl_clientid != new->cl_clientid)
 
 
 
 
 
 
 
 514			continue;
 515
 516		atomic_inc(&pos->cl_count);
 
 
 
 
 
 517		spin_unlock(&nn->nfs_client_lock);
 518
 519		if (prev)
 520			nfs_put_client(prev);
 521		prev = pos;
 522
 523		status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 524		switch (status) {
 525		case -NFS4ERR_STALE_CLIENTID:
 526			break;
 527		case 0:
 528			nfs4_swap_callback_idents(pos, new);
 
 
 529
 530			prev = NULL;
 531			*result = pos;
 532			dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 533				__func__, pos, atomic_read(&pos->cl_count));
 534			goto out;
 535		case -ERESTARTSYS:
 536		case -ETIMEDOUT:
 537			/* The callback path may have been inadvertently
 538			 * changed. Schedule recovery!
 539			 */
 540			nfs4_schedule_path_down_recovery(pos);
 541		default:
 542			goto out;
 543		}
 544
 545		spin_lock(&nn->nfs_client_lock);
 546	}
 
 547	spin_unlock(&nn->nfs_client_lock);
 548
 549	/* No match found. The server lost our clientid */
 550out:
 551	if (prev)
 552		nfs_put_client(prev);
 553	dprintk("NFS: <-- %s status = %d\n", __func__, status);
 554	return status;
 555}
 556
 557#ifdef CONFIG_NFS_V4_1
 558/*
 559 * Returns true if the client IDs match
 560 */
 561static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 
 
 562{
 563	if (a->cl_clientid != b->cl_clientid) {
 564		dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 565			__func__, a->cl_clientid, b->cl_clientid);
 566		return false;
 567	}
 568	dprintk("NFS: --> %s client ID %llx matches %llx\n",
 569		__func__, a->cl_clientid, b->cl_clientid);
 570	return true;
 571}
 572
 573/*
 574 * Returns true if the server owners match
 575 */
 576static bool
 577nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 
 578{
 579	struct nfs41_server_owner *o1 = a->cl_serverowner;
 580	struct nfs41_server_owner *o2 = b->cl_serverowner;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 581
 582	if (o1->minor_id != o2->minor_id) {
 583		dprintk("NFS: --> %s server owner minor IDs do not match\n",
 584			__func__);
 585		return false;
 586	}
 587
 588	if (o1->major_id_sz != o2->major_id_sz)
 589		goto out_major_mismatch;
 590	if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 591		goto out_major_mismatch;
 592
 593	dprintk("NFS: --> %s server owners match\n", __func__);
 594	return true;
 595
 596out_major_mismatch:
 597	dprintk("NFS: --> %s server owner major IDs do not match\n",
 598		__func__);
 599	return false;
 600}
 601
 602/**
 603 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 604 *
 605 * @new: nfs_client with client ID to test
 606 * @result: OUT: found nfs_client, or new
 607 * @cred: credential to use for trunking test
 608 *
 609 * Returns zero, a negative errno, or a negative NFS4ERR status.
 610 * If zero is returned, an nfs_client pointer is planted in "result."
 611 *
 612 * NB: nfs41_walk_client_list() relies on the new nfs_client being
 613 *     the last nfs_client on the list.
 614 */
 615int nfs41_walk_client_list(struct nfs_client *new,
 616			   struct nfs_client **result,
 617			   struct rpc_cred *cred)
 618{
 619	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 620	struct nfs_client *pos, *prev = NULL;
 621	int status = -NFS4ERR_STALE_CLIENTID;
 622
 623	spin_lock(&nn->nfs_client_lock);
 624	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 625		/* If "pos" isn't marked ready, we can't trust the
 626		 * remaining fields in "pos", especially the client
 627		 * ID and serverowner fields.  Wait for CREATE_SESSION
 628		 * to finish. */
 629		if (pos->cl_cons_state > NFS_CS_READY) {
 630			atomic_inc(&pos->cl_count);
 631			spin_unlock(&nn->nfs_client_lock);
 632
 633			if (prev)
 634				nfs_put_client(prev);
 635			prev = pos;
 636
 637			status = nfs_wait_client_init_complete(pos);
 638			if (status == 0) {
 639				nfs4_schedule_lease_recovery(pos);
 640				status = nfs4_wait_clnt_recover(pos);
 641			}
 642			spin_lock(&nn->nfs_client_lock);
 643			if (status < 0)
 644				break;
 645			status = -NFS4ERR_STALE_CLIENTID;
 646		}
 647		if (pos->cl_cons_state != NFS_CS_READY)
 648			continue;
 649
 650		if (pos->rpc_ops != new->rpc_ops)
 651			continue;
 652
 653		if (pos->cl_proto != new->cl_proto)
 654			continue;
 655
 656		if (pos->cl_minorversion != new->cl_minorversion)
 657			continue;
 658
 659		if (!nfs4_match_clientids(pos, new))
 
 
 
 
 
 
 660			continue;
 661
 662		if (!nfs4_match_serverowners(pos, new))
 663			continue;
 664
 665		atomic_inc(&pos->cl_count);
 666		*result = pos;
 667		status = 0;
 668		dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 669			__func__, pos, atomic_read(&pos->cl_count));
 670		break;
 671	}
 672
 673	/* No matching nfs_client found. */
 674	spin_unlock(&nn->nfs_client_lock);
 675	dprintk("NFS: <-- %s status = %d\n", __func__, status);
 676	if (prev)
 677		nfs_put_client(prev);
 678	return status;
 679}
 680#endif	/* CONFIG_NFS_V4_1 */
 681
 682static void nfs4_destroy_server(struct nfs_server *server)
 683{
 684	nfs_server_return_all_delegations(server);
 685	unset_pnfs_layoutdriver(server);
 686	nfs4_purge_state_owners(server);
 687}
 688
 689/*
 690 * NFSv4.0 callback thread helper
 691 *
 692 * Find a client by callback identifier
 693 */
 694struct nfs_client *
 695nfs4_find_client_ident(struct net *net, int cb_ident)
 696{
 697	struct nfs_client *clp;
 698	struct nfs_net *nn = net_generic(net, nfs_net_id);
 699
 700	spin_lock(&nn->nfs_client_lock);
 701	clp = idr_find(&nn->cb_ident_idr, cb_ident);
 702	if (clp)
 703		atomic_inc(&clp->cl_count);
 704	spin_unlock(&nn->nfs_client_lock);
 705	return clp;
 706}
 707
 708#if defined(CONFIG_NFS_V4_1)
 709/* Common match routine for v4.0 and v4.1 callback services */
 710static bool nfs4_cb_match_client(const struct sockaddr *addr,
 711		struct nfs_client *clp, u32 minorversion)
 712{
 713	struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 714
 715	/* Don't match clients that failed to initialise */
 716	if (!(clp->cl_cons_state == NFS_CS_READY ||
 717	    clp->cl_cons_state == NFS_CS_SESSION_INITING))
 718		return false;
 719
 720	smp_rmb();
 721
 722	/* Match the version and minorversion */
 723	if (clp->rpc_ops->version != 4 ||
 724	    clp->cl_minorversion != minorversion)
 725		return false;
 726
 727	/* Match only the IP address, not the port number */
 728	if (!nfs_sockaddr_match_ipaddr(addr, clap))
 729		return false;
 730
 731	return true;
 732}
 733
 734/*
 735 * NFSv4.1 callback thread helper
 736 * For CB_COMPOUND calls, find a client by IP address, protocol version,
 737 * minorversion, and sessionID
 738 *
 739 * Returns NULL if no such client
 740 */
 741struct nfs_client *
 742nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 743			   struct nfs4_sessionid *sid, u32 minorversion)
 744{
 745	struct nfs_client *clp;
 746	struct nfs_net *nn = net_generic(net, nfs_net_id);
 747
 748	spin_lock(&nn->nfs_client_lock);
 749	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 750		if (nfs4_cb_match_client(addr, clp, minorversion) == false)
 751			continue;
 752
 753		if (!nfs4_has_session(clp))
 754			continue;
 755
 756		/* Match sessionid*/
 757		if (memcmp(clp->cl_session->sess_id.data,
 758		    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 759			continue;
 760
 761		atomic_inc(&clp->cl_count);
 762		spin_unlock(&nn->nfs_client_lock);
 763		return clp;
 764	}
 765	spin_unlock(&nn->nfs_client_lock);
 766	return NULL;
 767}
 768
 769#else /* CONFIG_NFS_V4_1 */
 770
 771struct nfs_client *
 772nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 773			   struct nfs4_sessionid *sid, u32 minorversion)
 774{
 775	return NULL;
 776}
 777#endif /* CONFIG_NFS_V4_1 */
 778
 779/*
 780 * Set up an NFS4 client
 781 */
 782static int nfs4_set_client(struct nfs_server *server,
 783		const char *hostname,
 784		const struct sockaddr *addr,
 785		const size_t addrlen,
 786		const char *ip_addr,
 787		rpc_authflavor_t authflavour,
 788		int proto, const struct rpc_timeout *timeparms,
 789		u32 minorversion, struct net *net)
 790{
 791	struct nfs_client_initdata cl_init = {
 792		.hostname = hostname,
 793		.addr = addr,
 794		.addrlen = addrlen,
 
 795		.nfs_mod = &nfs_v4,
 796		.proto = proto,
 797		.minorversion = minorversion,
 798		.net = net,
 
 799	};
 800	struct nfs_client *clp;
 801	int error;
 802
 803	dprintk("--> nfs4_set_client()\n");
 804
 805	if (server->flags & NFS_MOUNT_NORESVPORT)
 806		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 807	if (server->options & NFS_OPTION_MIGRATION)
 808		set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 
 
 
 809
 810	/* Allocate or find a client reference we can use */
 811	clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 812	if (IS_ERR(clp)) {
 813		error = PTR_ERR(clp);
 814		goto error;
 
 
 
 815	}
 816
 817	/*
 818	 * Query for the lease time on clientid setup or renewal
 819	 *
 820	 * Note that this will be set on nfs_clients that were created
 821	 * only for the DS role and did not set this bit, but now will
 822	 * serve a dual role.
 823	 */
 824	set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 825
 826	server->nfs_client = clp;
 827	dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 828	return 0;
 829error:
 830	dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 831	return error;
 832}
 833
 834/*
 835 * Set up a pNFS Data Server client.
 836 *
 837 * Return any existing nfs_client that matches server address,port,version
 838 * and minorversion.
 839 *
 840 * For a new nfs_client, use a soft mount (default), a low retrans and a
 841 * low timeout interval so that if a connection is lost, we retry through
 842 * the MDS.
 843 */
 844struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 845		const struct sockaddr *ds_addr, int ds_addrlen,
 846		int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 
 847{
 
 
 848	struct nfs_client_initdata cl_init = {
 849		.addr = ds_addr,
 850		.addrlen = ds_addrlen,
 
 
 851		.nfs_mod = &nfs_v4,
 852		.proto = ds_proto,
 853		.minorversion = mds_clp->cl_minorversion,
 854		.net = mds_clp->cl_net,
 
 855	};
 856	struct rpc_timeout ds_timeout;
 857	struct nfs_client *clp;
 
 
 
 
 
 
 858
 859	/*
 860	 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 861	 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 862	 * (section 13.1 RFC 5661).
 863	 */
 864	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 865	clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 866			     mds_clp->cl_rpcclient->cl_auth->au_flavor);
 867
 868	dprintk("<-- %s %p\n", __func__, clp);
 869	return clp;
 870}
 871EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 872
 873/*
 874 * Session has been established, and the client marked ready.
 875 * Set the mount rsize and wsize with negotiated fore channel
 876 * attributes which will be bound checked in nfs_server_set_fsinfo.
 877 */
 878static void nfs4_session_set_rwsize(struct nfs_server *server)
 879{
 880#ifdef CONFIG_NFS_V4_1
 881	struct nfs4_session *sess;
 882	u32 server_resp_sz;
 883	u32 server_rqst_sz;
 884
 885	if (!nfs4_has_session(server->nfs_client))
 886		return;
 887	sess = server->nfs_client->cl_session;
 888	server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 889	server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 890
 891	if (server->rsize > server_resp_sz)
 892		server->rsize = server_resp_sz;
 893	if (server->wsize > server_rqst_sz)
 894		server->wsize = server_rqst_sz;
 895#endif /* CONFIG_NFS_V4_1 */
 896}
 897
 898static int nfs4_server_common_setup(struct nfs_server *server,
 899		struct nfs_fh *mntfh, bool auth_probe)
 900{
 901	struct nfs_fattr *fattr;
 902	int error;
 903
 904	/* data servers support only a subset of NFSv4.1 */
 905	if (is_ds_only_client(server->nfs_client))
 906		return -EPROTONOSUPPORT;
 907
 908	fattr = nfs_alloc_fattr();
 909	if (fattr == NULL)
 910		return -ENOMEM;
 911
 912	/* We must ensure the session is initialised first */
 913	error = nfs4_init_session(server->nfs_client);
 914	if (error < 0)
 915		goto out;
 916
 917	/* Set the basic capabilities */
 918	server->caps |= server->nfs_client->cl_mvops->init_caps;
 919	if (server->flags & NFS_MOUNT_NORDIRPLUS)
 920			server->caps &= ~NFS_CAP_READDIRPLUS;
 921	/*
 922	 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 923	 * authentication.
 924	 */
 925	if (nfs4_disable_idmapping &&
 926			server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
 927		server->caps |= NFS_CAP_UIDGID_NOMAP;
 928
 929
 930	/* Probe the root fh to retrieve its FSID and filehandle */
 931	error = nfs4_get_rootfh(server, mntfh, auth_probe);
 932	if (error < 0)
 933		goto out;
 934
 935	dprintk("Server FSID: %llx:%llx\n",
 936			(unsigned long long) server->fsid.major,
 937			(unsigned long long) server->fsid.minor);
 938	nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
 939
 940	nfs4_session_set_rwsize(server);
 941
 942	error = nfs_probe_fsinfo(server, mntfh, fattr);
 943	if (error < 0)
 944		goto out;
 945
 946	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 947		server->namelen = NFS4_MAXNAMLEN;
 948
 949	nfs_server_insert_lists(server);
 950	server->mount_time = jiffies;
 951	server->destroy = nfs4_destroy_server;
 952out:
 953	nfs_free_fattr(fattr);
 954	return error;
 955}
 956
 957/*
 958 * Create a version 4 volume record
 959 */
 960static int nfs4_init_server(struct nfs_server *server,
 961		struct nfs_parsed_mount_data *data)
 962{
 963	struct rpc_timeout timeparms;
 964	int error;
 965
 966	dprintk("--> nfs4_init_server()\n");
 967
 968	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 969			data->timeo, data->retrans);
 970
 971	/* Initialise the client representation from the mount data */
 972	server->flags = data->flags;
 973	server->options = data->options;
 974	server->auth_info = data->auth_info;
 975
 976	/* Use the first specified auth flavor. If this flavor isn't
 977	 * allowed by the server, use the SECINFO path to try the
 978	 * other specified flavors */
 979	if (data->auth_info.flavor_len >= 1)
 980		data->selected_flavor = data->auth_info.flavors[0];
 981	else
 982		data->selected_flavor = RPC_AUTH_UNIX;
 983
 984	/* Get a client record */
 985	error = nfs4_set_client(server,
 986			data->nfs_server.hostname,
 987			(const struct sockaddr *)&data->nfs_server.address,
 988			data->nfs_server.addrlen,
 989			data->client_address,
 990			data->selected_flavor,
 991			data->nfs_server.protocol,
 992			&timeparms,
 993			data->minorversion,
 994			data->net);
 995	if (error < 0)
 996		goto error;
 997
 998	if (data->rsize)
 999		server->rsize = nfs_block_size(data->rsize, NULL);
1000	if (data->wsize)
1001		server->wsize = nfs_block_size(data->wsize, NULL);
1002
1003	server->acregmin = data->acregmin * HZ;
1004	server->acregmax = data->acregmax * HZ;
1005	server->acdirmin = data->acdirmin * HZ;
1006	server->acdirmax = data->acdirmax * HZ;
 
1007
1008	server->port = data->nfs_server.port;
1009
1010	error = nfs_init_server_rpcclient(server, &timeparms,
1011					  data->selected_flavor);
1012
1013error:
1014	/* Done */
1015	dprintk("<-- nfs4_init_server() = %d\n", error);
1016	return error;
1017}
1018
1019/*
1020 * Create a version 4 volume record
1021 * - keyed on server and FSID
1022 */
1023/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1024				      struct nfs_fh *mntfh)*/
1025struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1026				      struct nfs_subversion *nfs_mod)
1027{
1028	struct nfs_server *server;
1029	bool auth_probe;
1030	int error;
1031
1032	dprintk("--> nfs4_create_server()\n");
1033
1034	server = nfs_alloc_server();
1035	if (!server)
1036		return ERR_PTR(-ENOMEM);
1037
1038	auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1039
1040	/* set up the general RPC client */
1041	error = nfs4_init_server(server, mount_info->parsed);
1042	if (error < 0)
1043		goto error;
1044
1045	error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1046	if (error < 0)
1047		goto error;
1048
1049	dprintk("<-- nfs4_create_server() = %p\n", server);
1050	return server;
1051
1052error:
1053	nfs_free_server(server);
1054	dprintk("<-- nfs4_create_server() = error %d\n", error);
1055	return ERR_PTR(error);
1056}
1057
1058/*
1059 * Create an NFS4 referral server record
1060 */
1061struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1062					       struct nfs_fh *mntfh)
1063{
1064	struct nfs_client *parent_client;
1065	struct nfs_server *server, *parent_server;
1066	bool auth_probe;
1067	int error;
1068
1069	dprintk("--> nfs4_create_referral_server()\n");
1070
1071	server = nfs_alloc_server();
1072	if (!server)
1073		return ERR_PTR(-ENOMEM);
1074
1075	parent_server = NFS_SB(data->sb);
1076	parent_client = parent_server->nfs_client;
1077
1078	/* Initialise the client representation from the parent server */
1079	nfs_server_copy_userdata(server, parent_server);
1080
1081	/* Get a client representation.
1082	 * Note: NFSv4 always uses TCP, */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1083	error = nfs4_set_client(server, data->hostname,
1084				data->addr,
1085				data->addrlen,
1086				parent_client->cl_ipaddr,
1087				data->authflavor,
1088				rpc_protocol(parent_server->client),
1089				parent_server->client->cl_timeout,
1090				parent_client->cl_mvops->minor_version,
1091				parent_client->cl_net);
1092	if (error < 0)
1093		goto error;
1094
 
 
 
1095	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1096	if (error < 0)
1097		goto error;
1098
1099	auth_probe = parent_server->auth_info.flavor_len < 1;
1100
1101	error = nfs4_server_common_setup(server, mntfh, auth_probe);
1102	if (error < 0)
1103		goto error;
1104
1105	dprintk("<-- nfs_create_referral_server() = %p\n", server);
1106	return server;
1107
1108error:
1109	nfs_free_server(server);
1110	dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1111	return ERR_PTR(error);
1112}
1113
1114/*
1115 * Grab the destination's particulars, including lease expiry time.
1116 *
1117 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1118 * we have cached.
1119 */
1120static int nfs_probe_destination(struct nfs_server *server)
1121{
1122	struct inode *inode = server->super->s_root->d_inode;
1123	struct nfs_fattr *fattr;
1124	int error;
1125
1126	fattr = nfs_alloc_fattr();
1127	if (fattr == NULL)
1128		return -ENOMEM;
1129
1130	/* Sanity: the probe won't work if the destination server
1131	 * does not recognize the migrated FH. */
1132	error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1133
1134	nfs_free_fattr(fattr);
1135	return error;
1136}
1137
1138/**
1139 * nfs4_update_server - Move an nfs_server to a different nfs_client
1140 *
1141 * @server: represents FSID to be moved
1142 * @hostname: new end-point's hostname
1143 * @sap: new end-point's socket address
1144 * @salen: size of "sap"
1145 * @net: net namespace
1146 *
1147 * The nfs_server must be quiescent before this function is invoked.
1148 * Either its session is drained (NFSv4.1+), or its transport is
1149 * plugged and drained (NFSv4.0).
1150 *
1151 * Returns zero on success, or a negative errno value.
1152 */
1153int nfs4_update_server(struct nfs_server *server, const char *hostname,
1154		       struct sockaddr *sap, size_t salen, struct net *net)
1155{
1156	struct nfs_client *clp = server->nfs_client;
1157	struct rpc_clnt *clnt = server->client;
1158	struct xprt_create xargs = {
1159		.ident		= clp->cl_proto,
1160		.net		= net,
1161		.dstaddr	= sap,
1162		.addrlen	= salen,
1163		.servername	= hostname,
1164	};
1165	char buf[INET6_ADDRSTRLEN + 1];
1166	struct sockaddr_storage address;
1167	struct sockaddr *localaddr = (struct sockaddr *)&address;
1168	int error;
1169
1170	dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1171			(unsigned long long)server->fsid.major,
1172			(unsigned long long)server->fsid.minor,
1173			hostname);
1174
1175	error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1176	if (error != 0) {
1177		dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1178			__func__, error);
1179		goto out;
1180	}
1181
1182	error = rpc_localaddr(clnt, localaddr, sizeof(address));
1183	if (error != 0) {
1184		dprintk("<-- %s(): rpc_localaddr returned %d\n",
1185			__func__, error);
1186		goto out;
1187	}
1188
1189	error = -EAFNOSUPPORT;
1190	if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1191		dprintk("<-- %s(): rpc_ntop returned %d\n",
1192			__func__, error);
1193		goto out;
1194	}
1195
1196	nfs_server_remove_lists(server);
 
1197	error = nfs4_set_client(server, hostname, sap, salen, buf,
1198				clp->cl_rpcclient->cl_auth->au_flavor,
1199				clp->cl_proto, clnt->cl_timeout,
1200				clp->cl_minorversion, net);
1201	nfs_put_client(clp);
1202	if (error != 0) {
1203		nfs_server_insert_lists(server);
1204		dprintk("<-- %s(): nfs4_set_client returned %d\n",
1205			__func__, error);
1206		goto out;
1207	}
 
1208
1209	if (server->nfs_client->cl_hostname == NULL)
1210		server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1211	nfs_server_insert_lists(server);
1212
1213	error = nfs_probe_destination(server);
1214	if (error < 0)
1215		goto out;
1216
1217	dprintk("<-- %s() succeeded\n", __func__);
1218
1219out:
1220	return error;
1221}