1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 */
   6#include <linux/module.h>
   7#include <linux/nfs_fs.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 "nfs4idmap.h"
  19#include "pnfs.h"
  20#include "netns.h"
  21#include "sysfs.h"
  22
  23#define NFSDBG_FACILITY		NFSDBG_CLIENT
  24
  25/*
  26 * Get a unique NFSv4.0 callback identifier which will be used
  27 * by the V4.0 callback service to lookup the nfs_client struct
  28 */
  29static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  30{
  31	int ret = 0;
  32	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  33
  34	if (clp->rpc_ops->version != 4 || minorversion != 0)
  35		return ret;
  36	idr_preload(GFP_KERNEL);
  37	spin_lock(&nn->nfs_client_lock);
  38	ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
  39	if (ret >= 0)
  40		clp->cl_cb_ident = ret;
  41	spin_unlock(&nn->nfs_client_lock);
  42	idr_preload_end();
  43	return ret < 0 ? ret : 0;
  44}
  45
  46#ifdef CONFIG_NFS_V4_1
  47/*
  48 * Per auth flavor data server rpc clients
  49 */
  50struct nfs4_ds_server {
  51	struct list_head	list;   /* ds_clp->cl_ds_clients */
  52	struct rpc_clnt		*rpc_clnt;
  53};
  54
  55/**
  56 * nfs4_find_ds_client - Common lookup case for DS I/O
  57 * @ds_clp: pointer to the DS's nfs_client
  58 * @flavor: rpc auth flavour to match
  59 */
  60static struct nfs4_ds_server *
  61nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  62{
  63	struct nfs4_ds_server *dss;
  64
  65	rcu_read_lock();
  66	list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
  67		if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  68			continue;
  69		goto out;
  70	}
  71	dss = NULL;
  72out:
  73	rcu_read_unlock();
  74	return dss;
  75}
  76
  77static struct nfs4_ds_server *
  78nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
  79			   struct nfs4_ds_server *new)
  80{
  81	struct nfs4_ds_server *dss;
  82
  83	spin_lock(&ds_clp->cl_lock);
  84	list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
  85		if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  86			continue;
  87		goto out;
  88	}
  89	if (new)
  90		list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
  91	dss = new;
  92out:
  93	spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
  94	return dss;
  95}
  96
  97static struct nfs4_ds_server *
  98nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  99{
 100	struct nfs4_ds_server *dss;
 101
 102	dss = kmalloc(sizeof(*dss), GFP_NOFS);
 103	if (dss == NULL)
 104		return ERR_PTR(-ENOMEM);
 105
 106	dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
 107	if (IS_ERR(dss->rpc_clnt)) {
 108		int err = PTR_ERR(dss->rpc_clnt);
 109		kfree (dss);
 110		return ERR_PTR(err);
 111	}
 112	INIT_LIST_HEAD(&dss->list);
 113
 114	return dss;
 115}
 116
 117static void
 118nfs4_free_ds_server(struct nfs4_ds_server *dss)
 119{
 120	rpc_release_client(dss->rpc_clnt);
 121	kfree(dss);
 122}
 123
 124/**
 125 * nfs4_find_or_create_ds_client - Find or create a DS rpc client
 126 * @ds_clp: pointer to the DS's nfs_client
 127 * @inode: pointer to the inode
 128 *
 129 * Find or create a DS rpc client with th MDS server rpc client auth flavor
 130 * in the nfs_client cl_ds_clients list.
 131 */
 132struct rpc_clnt *
 133nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
 134{
 135	struct nfs4_ds_server *dss, *new;
 136	rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
 137
 138	dss = nfs4_find_ds_client(ds_clp, flavor);
 139	if (dss != NULL)
 140		goto out;
 141	new = nfs4_alloc_ds_server(ds_clp, flavor);
 142	if (IS_ERR(new))
 143		return ERR_CAST(new);
 144	dss = nfs4_add_ds_client(ds_clp, flavor, new);
 145	if (dss != new)
 146		nfs4_free_ds_server(new);
 147out:
 148	return dss->rpc_clnt;
 149}
 150EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
 151
 152static void
 153nfs4_shutdown_ds_clients(struct nfs_client *clp)
 154{
 155	struct nfs4_ds_server *dss;
 156
 157	while (!list_empty(&clp->cl_ds_clients)) {
 158		dss = list_entry(clp->cl_ds_clients.next,
 159					struct nfs4_ds_server, list);
 160		list_del(&dss->list);
 161		rpc_shutdown_client(dss->rpc_clnt);
 162		kfree (dss);
 163	}
 164}
 165
 166static void
 167nfs4_cleanup_callback(struct nfs_client *clp)
 168{
 169	struct nfs4_copy_state *cp_state;
 170
 171	while (!list_empty(&clp->pending_cb_stateids)) {
 172		cp_state = list_entry(clp->pending_cb_stateids.next,
 173					struct nfs4_copy_state, copies);
 174		list_del(&cp_state->copies);
 175		kfree(cp_state);
 176	}
 177}
 178
 179void nfs41_shutdown_client(struct nfs_client *clp)
 180{
 181	if (nfs4_has_session(clp)) {
 182		nfs4_cleanup_callback(clp);
 183		nfs4_shutdown_ds_clients(clp);
 184		nfs4_destroy_session(clp->cl_session);
 185		nfs4_destroy_clientid(clp);
 186	}
 187
 188}
 189#endif	/* CONFIG_NFS_V4_1 */
 190
 191void nfs40_shutdown_client(struct nfs_client *clp)
 192{
 193	if (clp->cl_slot_tbl) {
 194		nfs4_shutdown_slot_table(clp->cl_slot_tbl);
 195		kfree(clp->cl_slot_tbl);
 196	}
 197}
 198
 199struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
 200{
 201	char buf[INET6_ADDRSTRLEN + 1];
 202	const char *ip_addr = cl_init->ip_addr;
 203	struct nfs_client *clp = nfs_alloc_client(cl_init);
 204	int err;
 205
 206	if (IS_ERR(clp))
 207		return clp;
 208
 209	err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
 210	if (err)
 211		goto error;
 212
 213	if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
 214		err = -EINVAL;
 215		goto error;
 216	}
 217
 218	spin_lock_init(&clp->cl_lock);
 219	INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
 220	INIT_LIST_HEAD(&clp->cl_ds_clients);
 221	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
 222	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 223	clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
 224	clp->cl_mig_gen = 1;
 225#if IS_ENABLED(CONFIG_NFS_V4_1)
 226	init_waitqueue_head(&clp->cl_lock_waitq);
 227#endif
 228	INIT_LIST_HEAD(&clp->pending_cb_stateids);
 229
 230	if (cl_init->minorversion != 0)
 231		__set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 232	__set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 233	__set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
 234
 235	if (test_bit(NFS_CS_DS, &cl_init->init_flags))
 236		__set_bit(NFS_CS_DS, &clp->cl_flags);
 237	/*
 238	 * Set up the connection to the server before we add add to the
 239	 * global list.
 240	 */
 241	err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
 242	if (err == -EINVAL)
 243		err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
 244	if (err < 0)
 245		goto error;
 246
 247	/* If no clientaddr= option was specified, find a usable cb address */
 248	if (ip_addr == NULL) {
 249		struct sockaddr_storage cb_addr;
 250		struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 251
 252		err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 253		if (err < 0)
 254			goto error;
 255		err = rpc_ntop(sap, buf, sizeof(buf));
 256		if (err < 0)
 257			goto error;
 258		ip_addr = (const char *)buf;
 259	}
 260	strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 261
 262	err = nfs_idmap_new(clp);
 263	if (err < 0) {
 264		dprintk("%s: failed to create idmapper. Error = %d\n",
 265			__func__, err);
 266		goto error;
 267	}
 268	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 269	return clp;
 270
 271error:
 272	nfs_free_client(clp);
 273	return ERR_PTR(err);
 274}
 275
 276/*
 277 * Destroy the NFS4 callback service
 278 */
 279static void nfs4_destroy_callback(struct nfs_client *clp)
 280{
 281	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 282		nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
 283}
 284
 285static void nfs4_shutdown_client(struct nfs_client *clp)
 286{
 287	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
 288		nfs4_kill_renewd(clp);
 289	clp->cl_mvops->shutdown_client(clp);
 290	nfs4_destroy_callback(clp);
 291	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 292		nfs_idmap_delete(clp);
 293
 294	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 295	kfree(clp->cl_serverowner);
 296	kfree(clp->cl_serverscope);
 297	kfree(clp->cl_implid);
 298	kfree(clp->cl_owner_id);
 299}
 300
 301void nfs4_free_client(struct nfs_client *clp)
 302{
 303	nfs4_shutdown_client(clp);
 304	nfs_free_client(clp);
 305}
 306
 307/*
 308 * Initialize the NFS4 callback service
 309 */
 310static int nfs4_init_callback(struct nfs_client *clp)
 311{
 312	struct rpc_xprt *xprt;
 313	int error;
 314
 315	xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 316
 317	if (nfs4_has_session(clp)) {
 318		error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
 319		if (error < 0)
 320			return error;
 321	}
 322
 323	error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 324	if (error < 0) {
 325		dprintk("%s: failed to start callback. Error = %d\n",
 326			__func__, error);
 327		return error;
 328	}
 329	__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 330
 331	return 0;
 332}
 333
 334/**
 335 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
 336 * @clp: nfs_client to initialize
 337 *
 338 * Returns zero on success, or a negative errno if some error occurred.
 339 */
 340int nfs40_init_client(struct nfs_client *clp)
 341{
 342	struct nfs4_slot_table *tbl;
 343	int ret;
 344
 345	tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
 346	if (tbl == NULL)
 347		return -ENOMEM;
 348
 349	ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
 350					"NFSv4.0 transport Slot table");
 351	if (ret) {
 352		nfs4_shutdown_slot_table(tbl);
 353		kfree(tbl);
 354		return ret;
 355	}
 356
 357	clp->cl_slot_tbl = tbl;
 358	return 0;
 359}
 360
 361#if defined(CONFIG_NFS_V4_1)
 362
 363/**
 364 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
 365 * @clp: nfs_client to initialize
 366 *
 367 * Returns zero on success, or a negative errno if some error occurred.
 368 */
 369int nfs41_init_client(struct nfs_client *clp)
 370{
 371	struct nfs4_session *session = NULL;
 372
 373	/*
 374	 * Create the session and mark it expired.
 375	 * When a SEQUENCE operation encounters the expired session
 376	 * it will do session recovery to initialize it.
 377	 */
 378	session = nfs4_alloc_session(clp);
 379	if (!session)
 380		return -ENOMEM;
 381
 382	clp->cl_session = session;
 383
 384	/*
 385	 * The create session reply races with the server back
 386	 * channel probe. Mark the client NFS_CS_SESSION_INITING
 387	 * so that the client back channel can find the
 388	 * nfs_client struct
 389	 */
 390	nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 391	return 0;
 392}
 393
 394#endif	/* CONFIG_NFS_V4_1 */
 395
 396/*
 397 * Initialize the minor version specific parts of an NFS4 client record
 398 */
 399static int nfs4_init_client_minor_version(struct nfs_client *clp)
 400{
 401	int ret;
 402
 403	ret = clp->cl_mvops->init_client(clp);
 404	if (ret)
 405		return ret;
 406	return nfs4_init_callback(clp);
 407}
 408
 409static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old)
 410{
 411	struct sockaddr_storage clp_addr, old_addr;
 412	struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr;
 413	struct sockaddr *old_sap = (struct sockaddr *)&old_addr;
 414	size_t clp_salen;
 415	struct xprt_create xprt_args = {
 416		.ident = old->cl_proto,
 417		.net = old->cl_net,
 418		.servername = old->cl_hostname,
 419	};
 420	int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ?
 421		clp->cl_max_connect : old->cl_max_connect;
 422
 423	if (clp->cl_proto != old->cl_proto)
 424		return;
 425	clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr));
 426	rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr));
 427
 428	if (clp_addr.ss_family != old_addr.ss_family)
 429		return;
 430
 431	xprt_args.dstaddr = clp_sap;
 432	xprt_args.addrlen = clp_salen;
 433
 434	rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args,
 435			  rpc_clnt_test_and_add_xprt, &max_connect);
 436}
 437
 438/**
 439 * nfs4_init_client - Initialise an NFS4 client record
 440 *
 441 * @clp: nfs_client to initialise
 442 * @cl_init: pointer to nfs_client_initdata
 443 *
 444 * Returns pointer to an NFS client, or an ERR_PTR value.
 445 */
 446struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 447				    const struct nfs_client_initdata *cl_init)
 448{
 449	struct nfs_client *old;
 450	int error;
 451
 452	if (clp->cl_cons_state == NFS_CS_READY)
 453		/* the client is initialised already */
 454		return clp;
 455
 456	error = nfs4_init_client_minor_version(clp);
 457	if (error < 0)
 458		goto error;
 459
 460	error = nfs4_discover_server_trunking(clp, &old);
 461	if (error < 0)
 462		goto error;
 463
 464	if (clp != old) {
 465		clp->cl_preserve_clid = true;
 466		/*
 467		 * Mark the client as having failed initialization so other
 468		 * processes walking the nfs_client_list in nfs_match_client()
 469		 * won't try to use it.
 470		 */
 471		nfs_mark_client_ready(clp, -EPERM);
 472		if (old->cl_mvops->session_trunk)
 473			nfs4_add_trunk(clp, old);
 474	}
 475	clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
 476	nfs_put_client(clp);
 477	return old;
 478
 479error:
 480	nfs_mark_client_ready(clp, error);
 481	nfs_put_client(clp);
 482	return ERR_PTR(error);
 483}
 484
 485/*
 486 * SETCLIENTID just did a callback update with the callback ident in
 487 * "drop," but server trunking discovery claims "drop" and "keep" are
 488 * actually the same server.  Swap the callback IDs so that "keep"
 489 * will continue to use the callback ident the server now knows about,
 490 * and so that "keep"'s original callback ident is destroyed when
 491 * "drop" is freed.
 492 */
 493static void nfs4_swap_callback_idents(struct nfs_client *keep,
 494				      struct nfs_client *drop)
 495{
 496	struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 497	unsigned int save = keep->cl_cb_ident;
 498
 499	if (keep->cl_cb_ident == drop->cl_cb_ident)
 500		return;
 501
 502	dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 503		__func__, keep->cl_cb_ident, drop->cl_cb_ident);
 504
 505	spin_lock(&nn->nfs_client_lock);
 506
 507	idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 508	keep->cl_cb_ident = drop->cl_cb_ident;
 509
 510	idr_replace(&nn->cb_ident_idr, drop, save);
 511	drop->cl_cb_ident = save;
 512
 513	spin_unlock(&nn->nfs_client_lock);
 514}
 515
 516static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
 517		const struct nfs_client *clp2)
 518{
 519	if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
 520		return true;
 521	return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
 522}
 523
 524static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
 525{
 526	return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
 527}
 528
 529static int nfs4_match_client(struct nfs_client  *pos,  struct nfs_client *new,
 530			     struct nfs_client **prev, struct nfs_net *nn)
 531{
 532	int status;
 533
 534	if (pos->rpc_ops != new->rpc_ops)
 535		return 1;
 536
 537	if (pos->cl_minorversion != new->cl_minorversion)
 538		return 1;
 539
 540	/* If "pos" isn't marked ready, we can't trust the
 541	 * remaining fields in "pos", especially the client
 542	 * ID and serverowner fields.  Wait for CREATE_SESSION
 543	 * to finish. */
 544	if (pos->cl_cons_state > NFS_CS_READY) {
 545		refcount_inc(&pos->cl_count);
 546		spin_unlock(&nn->nfs_client_lock);
 547
 548		nfs_put_client(*prev);
 549		*prev = pos;
 550
 551		status = nfs_wait_client_init_complete(pos);
 552		spin_lock(&nn->nfs_client_lock);
 553
 554		if (status < 0)
 555			return status;
 556	}
 557
 558	if (pos->cl_cons_state != NFS_CS_READY)
 559		return 1;
 560
 561	if (pos->cl_clientid != new->cl_clientid)
 562		return 1;
 563
 564	/* NFSv4.1 always uses the uniform string, however someone
 565	 * might switch the uniquifier string on us.
 566	 */
 567	if (!nfs4_match_client_owner_id(pos, new))
 568		return 1;
 569
 570	return 0;
 571}
 572
 573/**
 574 * nfs40_walk_client_list - Find server that recognizes a client ID
 575 *
 576 * @new: nfs_client with client ID to test
 577 * @result: OUT: found nfs_client, or new
 578 * @cred: credential to use for trunking test
 579 *
 580 * Returns zero, a negative errno, or a negative NFS4ERR status.
 581 * If zero is returned, an nfs_client pointer is planted in "result."
 582 *
 583 * NB: nfs40_walk_client_list() relies on the new nfs_client being
 584 *     the last nfs_client on the list.
 585 */
 586int nfs40_walk_client_list(struct nfs_client *new,
 587			   struct nfs_client **result,
 588			   const struct cred *cred)
 589{
 590	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 591	struct nfs_client *pos, *prev = NULL;
 592	struct nfs4_setclientid_res clid = {
 593		.clientid	= new->cl_clientid,
 594		.confirm	= new->cl_confirm,
 595	};
 596	int status = -NFS4ERR_STALE_CLIENTID;
 597
 598	spin_lock(&nn->nfs_client_lock);
 599	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 600
 601		if (pos == new)
 602			goto found;
 603
 604		status = nfs4_match_client(pos, new, &prev, nn);
 605		if (status < 0)
 606			goto out_unlock;
 607		if (status != 0)
 608			continue;
 609		/*
 610		 * We just sent a new SETCLIENTID, which should have
 611		 * caused the server to return a new cl_confirm.  So if
 612		 * cl_confirm is the same, then this is a different
 613		 * server that just returned the same cl_confirm by
 614		 * coincidence:
 615		 */
 616		if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
 617						       &new->cl_confirm))
 618			continue;
 619		/*
 620		 * But if the cl_confirm's are different, then the only
 621		 * way that a SETCLIENTID_CONFIRM to pos can succeed is
 622		 * if new and pos point to the same server:
 623		 */
 624found:
 625		refcount_inc(&pos->cl_count);
 626		spin_unlock(&nn->nfs_client_lock);
 627
 628		nfs_put_client(prev);
 629		prev = pos;
 630
 631		status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 632		switch (status) {
 633		case -NFS4ERR_STALE_CLIENTID:
 634			break;
 635		case 0:
 636			nfs4_swap_callback_idents(pos, new);
 637			pos->cl_confirm = new->cl_confirm;
 638			nfs_mark_client_ready(pos, NFS_CS_READY);
 639
 640			prev = NULL;
 641			*result = pos;
 642			goto out;
 643		case -ERESTARTSYS:
 644		case -ETIMEDOUT:
 645			/* The callback path may have been inadvertently
 646			 * changed. Schedule recovery!
 647			 */
 648			nfs4_schedule_path_down_recovery(pos);
 649			goto out;
 650		default:
 651			goto out;
 652		}
 653
 654		spin_lock(&nn->nfs_client_lock);
 655	}
 656out_unlock:
 657	spin_unlock(&nn->nfs_client_lock);
 658
 659	/* No match found. The server lost our clientid */
 660out:
 661	nfs_put_client(prev);
 662	return status;
 663}
 664
 665#ifdef CONFIG_NFS_V4_1
 666/*
 667 * Returns true if the server major ids match
 668 */
 669bool
 670nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 671				struct nfs41_server_owner *o2)
 672{
 673	if (o1->major_id_sz != o2->major_id_sz)
 674		return false;
 675	return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
 676}
 677
 678/*
 679 * Returns true if the server scopes match
 680 */
 681static bool
 682nfs4_check_server_scope(struct nfs41_server_scope *s1,
 683			struct nfs41_server_scope *s2)
 684{
 685	if (s1->server_scope_sz != s2->server_scope_sz)
 686		return false;
 687	return memcmp(s1->server_scope, s2->server_scope,
 688					s1->server_scope_sz) == 0;
 689}
 690
 691/**
 692 * nfs4_detect_session_trunking - Checks for session trunking.
 693 * @clp:    original mount nfs_client
 694 * @res:    result structure from an exchange_id using the original mount
 695 *          nfs_client with a new multi_addr transport
 696 * @xprt:   pointer to the transport to add.
 697 *
 698 * Called after a successful EXCHANGE_ID on a multi-addr connection.
 699 * Upon success, add the transport.
 700 *
 701 * Returns zero on success, otherwise -EINVAL
 702 *
 703 * Note: since the exchange_id for the new multi_addr transport uses the
 704 * same nfs_client from the original mount, the cl_owner_id is reused,
 705 * so eir_clientowner is the same.
 706 */
 707int nfs4_detect_session_trunking(struct nfs_client *clp,
 708				 struct nfs41_exchange_id_res *res,
 709				 struct rpc_xprt *xprt)
 710{
 711	/* Check eir_clientid */
 712	if (clp->cl_clientid != res->clientid)
 713		goto out_err;
 714
 715	/* Check eir_server_owner so_major_id */
 716	if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
 717					     res->server_owner))
 718		goto out_err;
 719
 720	/* Check eir_server_owner so_minor_id */
 721	if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
 722		goto out_err;
 723
 724	/* Check eir_server_scope */
 725	if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
 726		goto out_err;
 727
 728	pr_info("NFS:  %s: Session trunking succeeded for %s\n",
 729		clp->cl_hostname,
 730		xprt->address_strings[RPC_DISPLAY_ADDR]);
 731
 732	return 0;
 733out_err:
 734	pr_info("NFS:  %s: Session trunking failed for %s\n", clp->cl_hostname,
 735		xprt->address_strings[RPC_DISPLAY_ADDR]);
 736
 737	return -EINVAL;
 738}
 739
 740/**
 741 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 742 *
 743 * @new: nfs_client with client ID to test
 744 * @result: OUT: found nfs_client, or new
 745 * @cred: credential to use for trunking test
 746 *
 747 * Returns zero, a negative errno, or a negative NFS4ERR status.
 748 * If zero is returned, an nfs_client pointer is planted in "result."
 749 *
 750 * NB: nfs41_walk_client_list() relies on the new nfs_client being
 751 *     the last nfs_client on the list.
 752 */
 753int nfs41_walk_client_list(struct nfs_client *new,
 754			   struct nfs_client **result,
 755			   const struct cred *cred)
 756{
 757	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 758	struct nfs_client *pos, *prev = NULL;
 759	int status = -NFS4ERR_STALE_CLIENTID;
 760
 761	spin_lock(&nn->nfs_client_lock);
 762	list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 763
 764		if (pos == new)
 765			goto found;
 766
 767		status = nfs4_match_client(pos, new, &prev, nn);
 768		if (status < 0)
 769			goto out;
 770		if (status != 0)
 771			continue;
 772
 773		/*
 774		 * Note that session trunking is just a special subcase of
 775		 * client id trunking. In either case, we want to fall back
 776		 * to using the existing nfs_client.
 777		 */
 778		if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
 779						     new->cl_serverowner))
 780			continue;
 781
 782found:
 783		refcount_inc(&pos->cl_count);
 784		*result = pos;
 785		status = 0;
 786		break;
 787	}
 788
 789out:
 790	spin_unlock(&nn->nfs_client_lock);
 791	nfs_put_client(prev);
 792	return status;
 793}
 794#endif	/* CONFIG_NFS_V4_1 */
 795
 796static void nfs4_destroy_server(struct nfs_server *server)
 797{
 798	LIST_HEAD(freeme);
 799
 800	nfs_server_return_all_delegations(server);
 801	unset_pnfs_layoutdriver(server);
 802	nfs4_purge_state_owners(server, &freeme);
 803	nfs4_free_state_owners(&freeme);
 804}
 805
 806/*
 807 * NFSv4.0 callback thread helper
 808 *
 809 * Find a client by callback identifier
 810 */
 811struct nfs_client *
 812nfs4_find_client_ident(struct net *net, int cb_ident)
 813{
 814	struct nfs_client *clp;
 815	struct nfs_net *nn = net_generic(net, nfs_net_id);
 816
 817	spin_lock(&nn->nfs_client_lock);
 818	clp = idr_find(&nn->cb_ident_idr, cb_ident);
 819	if (clp)
 820		refcount_inc(&clp->cl_count);
 821	spin_unlock(&nn->nfs_client_lock);
 822	return clp;
 823}
 824
 825#if defined(CONFIG_NFS_V4_1)
 826/* Common match routine for v4.0 and v4.1 callback services */
 827static bool nfs4_cb_match_client(const struct sockaddr *addr,
 828		struct nfs_client *clp, u32 minorversion)
 829{
 830	struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 831
 832	/* Don't match clients that failed to initialise */
 833	if (!(clp->cl_cons_state == NFS_CS_READY ||
 834	    clp->cl_cons_state == NFS_CS_SESSION_INITING))
 835		return false;
 836
 837	smp_rmb();
 838
 839	/* Match the version and minorversion */
 840	if (clp->rpc_ops->version != 4 ||
 841	    clp->cl_minorversion != minorversion)
 842		return false;
 843
 844	/* Match only the IP address, not the port number */
 845	return rpc_cmp_addr(addr, clap);
 846}
 847
 848/*
 849 * NFSv4.1 callback thread helper
 850 * For CB_COMPOUND calls, find a client by IP address, protocol version,
 851 * minorversion, and sessionID
 852 *
 853 * Returns NULL if no such client
 854 */
 855struct nfs_client *
 856nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 857			   struct nfs4_sessionid *sid, u32 minorversion)
 858{
 859	struct nfs_client *clp;
 860	struct nfs_net *nn = net_generic(net, nfs_net_id);
 861
 862	spin_lock(&nn->nfs_client_lock);
 863	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 864		if (!nfs4_cb_match_client(addr, clp, minorversion))
 865			continue;
 866
 867		if (!nfs4_has_session(clp))
 868			continue;
 869
 870		/* Match sessionid*/
 871		if (memcmp(clp->cl_session->sess_id.data,
 872		    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 873			continue;
 874
 875		refcount_inc(&clp->cl_count);
 876		spin_unlock(&nn->nfs_client_lock);
 877		return clp;
 878	}
 879	spin_unlock(&nn->nfs_client_lock);
 880	return NULL;
 881}
 882
 883#else /* CONFIG_NFS_V4_1 */
 884
 885struct nfs_client *
 886nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 887			   struct nfs4_sessionid *sid, u32 minorversion)
 888{
 889	return NULL;
 890}
 891#endif /* CONFIG_NFS_V4_1 */
 892
 893/*
 894 * Set up an NFS4 client
 895 */
 896static int nfs4_set_client(struct nfs_server *server,
 897		const char *hostname,
 898		const struct sockaddr_storage *addr,
 899		const size_t addrlen,
 900		const char *ip_addr,
 901		int proto, const struct rpc_timeout *timeparms,
 902		u32 minorversion, unsigned int nconnect,
 903		unsigned int max_connect,
 904		struct net *net,
 905		struct xprtsec_parms *xprtsec)
 906{
 907	struct nfs_client_initdata cl_init = {
 908		.hostname = hostname,
 909		.addr = addr,
 910		.addrlen = addrlen,
 911		.ip_addr = ip_addr,
 912		.nfs_mod = &nfs_v4,
 913		.proto = proto,
 914		.minorversion = minorversion,
 915		.net = net,
 916		.timeparms = timeparms,
 917		.cred = server->cred,
 918		.xprtsec = *xprtsec,
 919	};
 920	struct nfs_client *clp;
 921
 922	if (minorversion == 0)
 923		__set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags);
 924	else
 925		cl_init.max_connect = max_connect;
 926	switch (proto) {
 927	case XPRT_TRANSPORT_RDMA:
 928	case XPRT_TRANSPORT_TCP:
 929	case XPRT_TRANSPORT_TCP_TLS:
 930		cl_init.nconnect = nconnect;
 931	}
 932
 933	if (server->flags & NFS_MOUNT_NORESVPORT)
 934		__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 935	if (server->options & NFS_OPTION_MIGRATION)
 936		__set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 937	if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
 938		__set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
 939	server->port = rpc_get_port((struct sockaddr *)addr);
 940
 941	/* Allocate or find a client reference we can use */
 942	clp = nfs_get_client(&cl_init);
 943	if (IS_ERR(clp))
 944		return PTR_ERR(clp);
 945
 946	if (server->nfs_client == clp) {
 947		nfs_put_client(clp);
 948		return -ELOOP;
 949	}
 950
 951	/*
 952	 * Query for the lease time on clientid setup or renewal
 953	 *
 954	 * Note that this will be set on nfs_clients that were created
 955	 * only for the DS role and did not set this bit, but now will
 956	 * serve a dual role.
 957	 */
 958	set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 959
 960	server->nfs_client = clp;
 961	nfs_sysfs_add_server(server);
 962	nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
 963
 964	return 0;
 965}
 966
 967/*
 968 * Set up a pNFS Data Server client.
 969 *
 970 * Return any existing nfs_client that matches server address,port,version
 971 * and minorversion.
 972 *
 973 * For a new nfs_client, use a soft mount (default), a low retrans and a
 974 * low timeout interval so that if a connection is lost, we retry through
 975 * the MDS.
 976 */
 977struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 978		const struct sockaddr_storage *ds_addr, int ds_addrlen,
 979		int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
 980		u32 minor_version)
 981{
 982	struct rpc_timeout ds_timeout;
 983	struct nfs_client *mds_clp = mds_srv->nfs_client;
 984	struct nfs_client_initdata cl_init = {
 985		.addr = ds_addr,
 986		.addrlen = ds_addrlen,
 987		.nodename = mds_clp->cl_rpcclient->cl_nodename,
 988		.ip_addr = mds_clp->cl_ipaddr,
 989		.nfs_mod = &nfs_v4,
 990		.proto = ds_proto,
 991		.minorversion = minor_version,
 992		.net = mds_clp->cl_net,
 993		.timeparms = &ds_timeout,
 994		.cred = mds_srv->cred,
 995		.xprtsec = mds_srv->nfs_client->cl_xprtsec,
 996	};
 997	char buf[INET6_ADDRSTRLEN + 1];
 998
 999	if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0)
1000		return ERR_PTR(-EINVAL);
1001	cl_init.hostname = buf;
1002
1003	switch (ds_proto) {
1004	case XPRT_TRANSPORT_RDMA:
1005	case XPRT_TRANSPORT_TCP:
1006	case XPRT_TRANSPORT_TCP_TLS:
1007		if (mds_clp->cl_nconnect > 1) {
1008			cl_init.nconnect = mds_clp->cl_nconnect;
1009			cl_init.max_connect = NFS_MAX_TRANSPORTS;
1010		}
1011	}
1012
1013	if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
1014		__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
1015
1016	__set_bit(NFS_CS_DS, &cl_init.init_flags);
1017	__set_bit(NFS_CS_PNFS, &cl_init.init_flags);
1018	cl_init.max_connect = NFS_MAX_TRANSPORTS;
1019	/*
1020	 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1021	 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1022	 * (section 13.1 RFC 5661).
1023	 */
1024	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
1025	return nfs_get_client(&cl_init);
1026}
1027EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1028
1029/*
1030 * Session has been established, and the client marked ready.
1031 * Limit the mount rsize, wsize and dtsize using negotiated fore
1032 * channel attributes.
1033 */
1034static void nfs4_session_limit_rwsize(struct nfs_server *server)
1035{
1036#ifdef CONFIG_NFS_V4_1
1037	struct nfs4_session *sess;
1038	u32 server_resp_sz;
1039	u32 server_rqst_sz;
1040
1041	if (!nfs4_has_session(server->nfs_client))
1042		return;
1043	sess = server->nfs_client->cl_session;
1044	server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1045	server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1046
1047	if (server->dtsize > server_resp_sz)
1048		server->dtsize = server_resp_sz;
1049	if (server->rsize > server_resp_sz)
1050		server->rsize = server_resp_sz;
1051	if (server->wsize > server_rqst_sz)
1052		server->wsize = server_rqst_sz;
1053#endif /* CONFIG_NFS_V4_1 */
1054}
1055
1056/*
1057 * Limit xattr sizes using the channel attributes.
1058 */
1059static void nfs4_session_limit_xasize(struct nfs_server *server)
1060{
1061#ifdef CONFIG_NFS_V4_2
1062	struct nfs4_session *sess;
1063	u32 server_gxa_sz;
1064	u32 server_sxa_sz;
1065	u32 server_lxa_sz;
1066
1067	if (!nfs4_has_session(server->nfs_client))
1068		return;
1069
1070	sess = server->nfs_client->cl_session;
1071
1072	server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead;
1073	server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead;
1074	server_lxa_sz = sess->fc_attrs.max_resp_sz -
1075	    nfs42_maxlistxattrs_overhead;
1076
1077	if (server->gxasize > server_gxa_sz)
1078		server->gxasize = server_gxa_sz;
1079	if (server->sxasize > server_sxa_sz)
1080		server->sxasize = server_sxa_sz;
1081	if (server->lxasize > server_lxa_sz)
1082		server->lxasize = server_lxa_sz;
1083#endif
1084}
1085
1086void nfs4_server_set_init_caps(struct nfs_server *server)
1087{
1088	/* Set the basic capabilities */
1089	server->caps |= server->nfs_client->cl_mvops->init_caps;
1090	if (server->flags & NFS_MOUNT_NORDIRPLUS)
1091			server->caps &= ~NFS_CAP_READDIRPLUS;
1092	if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA)
1093		server->caps &= ~NFS_CAP_READ_PLUS;
1094
1095	/*
1096	 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1097	 * authentication.
1098	 */
1099	if (nfs4_disable_idmapping &&
1100			server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1101		server->caps |= NFS_CAP_UIDGID_NOMAP;
1102}
1103
1104static int nfs4_server_common_setup(struct nfs_server *server,
1105		struct nfs_fh *mntfh, bool auth_probe)
1106{
1107	int error;
1108
1109	/* data servers support only a subset of NFSv4.1 */
1110	if (is_ds_only_client(server->nfs_client))
1111		return -EPROTONOSUPPORT;
1112
1113	/* We must ensure the session is initialised first */
1114	error = nfs4_init_session(server->nfs_client);
1115	if (error < 0)
1116		goto out;
1117
1118	nfs4_server_set_init_caps(server);
1119
1120	/* Probe the root fh to retrieve its FSID and filehandle */
1121	error = nfs4_get_rootfh(server, mntfh, auth_probe);
1122	if (error < 0)
1123		goto out;
1124
1125	dprintk("Server FSID: %llx:%llx\n",
1126			(unsigned long long) server->fsid.major,
1127			(unsigned long long) server->fsid.minor);
1128	nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1129
1130	error = nfs_probe_server(server, mntfh);
1131	if (error < 0)
1132		goto out;
1133
1134	nfs4_session_limit_rwsize(server);
1135	nfs4_session_limit_xasize(server);
1136
1137	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1138		server->namelen = NFS4_MAXNAMLEN;
1139
1140	nfs_server_insert_lists(server);
1141	server->mount_time = jiffies;
1142	server->destroy = nfs4_destroy_server;
1143out:
1144	return error;
1145}
1146
1147/*
1148 * Create a version 4 volume record
1149 */
1150static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
1151{
1152	struct nfs_fs_context *ctx = nfs_fc2context(fc);
1153	struct rpc_timeout timeparms;
1154	int error;
1155
1156	nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
1157				ctx->timeo, ctx->retrans);
1158
1159	/* Initialise the client representation from the mount data */
1160	server->flags = ctx->flags;
1161	server->options = ctx->options;
1162	server->auth_info = ctx->auth_info;
1163
1164	/* Use the first specified auth flavor. If this flavor isn't
1165	 * allowed by the server, use the SECINFO path to try the
1166	 * other specified flavors */
1167	if (ctx->auth_info.flavor_len >= 1)
1168		ctx->selected_flavor = ctx->auth_info.flavors[0];
1169	else
1170		ctx->selected_flavor = RPC_AUTH_UNIX;
1171
1172	/* Get a client record */
1173	error = nfs4_set_client(server,
1174				ctx->nfs_server.hostname,
1175				&ctx->nfs_server._address,
1176				ctx->nfs_server.addrlen,
1177				ctx->client_address,
1178				ctx->nfs_server.protocol,
1179				&timeparms,
1180				ctx->minorversion,
1181				ctx->nfs_server.nconnect,
1182				ctx->nfs_server.max_connect,
1183				fc->net_ns,
1184				&ctx->xprtsec);
1185	if (error < 0)
1186		return error;
1187
1188	if (ctx->rsize)
1189		server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto);
1190	if (ctx->wsize)
1191		server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto);
1192
1193	server->acregmin = ctx->acregmin * HZ;
1194	server->acregmax = ctx->acregmax * HZ;
1195	server->acdirmin = ctx->acdirmin * HZ;
1196	server->acdirmax = ctx->acdirmax * HZ;
1197	server->port     = ctx->nfs_server.port;
1198
1199	return nfs_init_server_rpcclient(server, &timeparms,
1200					 ctx->selected_flavor);
1201}
1202
1203/*
1204 * Create a version 4 volume record
1205 * - keyed on server and FSID
1206 */
1207struct nfs_server *nfs4_create_server(struct fs_context *fc)
1208{
1209	struct nfs_fs_context *ctx = nfs_fc2context(fc);
1210	struct nfs_server *server;
1211	bool auth_probe;
1212	int error;
1213
1214	server = nfs_alloc_server();
1215	if (!server)
1216		return ERR_PTR(-ENOMEM);
1217
1218	server->cred = get_cred(fc->cred);
1219
1220	auth_probe = ctx->auth_info.flavor_len < 1;
1221
1222	/* set up the general RPC client */
1223	error = nfs4_init_server(server, fc);
1224	if (error < 0)
1225		goto error;
1226
1227	error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1228	if (error < 0)
1229		goto error;
1230
1231	return server;
1232
1233error:
1234	nfs_free_server(server);
1235	return ERR_PTR(error);
1236}
1237
1238/*
1239 * Create an NFS4 referral server record
1240 */
1241struct nfs_server *nfs4_create_referral_server(struct fs_context *fc)
1242{
1243	struct nfs_fs_context *ctx = nfs_fc2context(fc);
1244	struct nfs_client *parent_client;
1245	struct nfs_server *server, *parent_server;
1246	int proto, error;
1247	bool auth_probe;
1248
1249	server = nfs_alloc_server();
1250	if (!server)
1251		return ERR_PTR(-ENOMEM);
1252
1253	parent_server = NFS_SB(ctx->clone_data.sb);
1254	parent_client = parent_server->nfs_client;
1255
1256	server->cred = get_cred(parent_server->cred);
1257
1258	/* Initialise the client representation from the parent server */
1259	nfs_server_copy_userdata(server, parent_server);
1260
1261	/* Get a client representation */
1262#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1263	rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT);
1264	error = nfs4_set_client(server,
1265				ctx->nfs_server.hostname,
1266				&ctx->nfs_server._address,
1267				ctx->nfs_server.addrlen,
1268				parent_client->cl_ipaddr,
1269				XPRT_TRANSPORT_RDMA,
1270				parent_server->client->cl_timeout,
1271				parent_client->cl_mvops->minor_version,
1272				parent_client->cl_nconnect,
1273				parent_client->cl_max_connect,
1274				parent_client->cl_net,
1275				&parent_client->cl_xprtsec);
1276	if (!error)
1277		goto init_server;
1278#endif	/* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */
1279
1280	proto = XPRT_TRANSPORT_TCP;
1281	if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE)
1282		proto = XPRT_TRANSPORT_TCP_TLS;
1283	rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
1284	error = nfs4_set_client(server,
1285				ctx->nfs_server.hostname,
1286				&ctx->nfs_server._address,
1287				ctx->nfs_server.addrlen,
1288				parent_client->cl_ipaddr,
1289				proto,
1290				parent_server->client->cl_timeout,
1291				parent_client->cl_mvops->minor_version,
1292				parent_client->cl_nconnect,
1293				parent_client->cl_max_connect,
1294				parent_client->cl_net,
1295				&parent_client->cl_xprtsec);
1296	if (error < 0)
1297		goto error;
1298
1299#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1300init_server:
1301#endif
1302	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
1303					  ctx->selected_flavor);
1304	if (error < 0)
1305		goto error;
1306
1307	auth_probe = parent_server->auth_info.flavor_len < 1;
1308
1309	error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1310	if (error < 0)
1311		goto error;
1312
1313	return server;
1314
1315error:
1316	nfs_free_server(server);
1317	return ERR_PTR(error);
1318}
1319
1320/**
1321 * nfs4_update_server - Move an nfs_server to a different nfs_client
1322 *
1323 * @server: represents FSID to be moved
1324 * @hostname: new end-point's hostname
1325 * @sap: new end-point's socket address
1326 * @salen: size of "sap"
1327 * @net: net namespace
1328 *
1329 * The nfs_server must be quiescent before this function is invoked.
1330 * Either its session is drained (NFSv4.1+), or its transport is
1331 * plugged and drained (NFSv4.0).
1332 *
1333 * Returns zero on success, or a negative errno value.
1334 */
1335int nfs4_update_server(struct nfs_server *server, const char *hostname,
1336		       struct sockaddr_storage *sap, size_t salen, struct net *net)
1337{
1338	struct nfs_client *clp = server->nfs_client;
1339	struct rpc_clnt *clnt = server->client;
1340	struct xprt_create xargs = {
1341		.ident		= clp->cl_proto,
1342		.net		= net,
1343		.dstaddr	= (struct sockaddr *)sap,
1344		.addrlen	= salen,
1345		.servername	= hostname,
1346		/* cel: bleh. We might need to pass TLS parameters here */
1347	};
1348	char buf[INET6_ADDRSTRLEN + 1];
1349	struct sockaddr_storage address;
1350	struct sockaddr *localaddr = (struct sockaddr *)&address;
1351	int error;
1352
1353	error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1354	if (error != 0)
1355		return error;
1356
1357	error = rpc_localaddr(clnt, localaddr, sizeof(address));
1358	if (error != 0)
1359		return error;
1360
1361	if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1362		return -EAFNOSUPPORT;
1363
1364	nfs_server_remove_lists(server);
1365	set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1366	error = nfs4_set_client(server, hostname, sap, salen, buf,
1367				clp->cl_proto, clnt->cl_timeout,
1368				clp->cl_minorversion,
1369				clp->cl_nconnect, clp->cl_max_connect,
1370				net, &clp->cl_xprtsec);
1371	clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1372	if (error != 0) {
1373		nfs_server_insert_lists(server);
1374		return error;
1375	}
1376	nfs_put_client(clp);
1377
1378	if (server->nfs_client->cl_hostname == NULL) {
1379		server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1380		if (server->nfs_client->cl_hostname == NULL)
1381			return -ENOMEM;
1382	}
1383	nfs_server_insert_lists(server);
1384
1385	return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root)));
1386}