1/*
   2*  Copyright (c) 2001 The Regents of the University of Michigan.
   3*  All rights reserved.
   4*
   5*  Kendrick Smith <kmsmith@umich.edu>
   6*  Andy Adamson <kandros@umich.edu>
   7*
   8*  Redistribution and use in source and binary forms, with or without
   9*  modification, are permitted provided that the following conditions
  10*  are met:
  11*
  12*  1. Redistributions of source code must retain the above copyright
  13*     notice, this list of conditions and the following disclaimer.
  14*  2. Redistributions in binary form must reproduce the above copyright
  15*     notice, this list of conditions and the following disclaimer in the
  16*     documentation and/or other materials provided with the distribution.
  17*  3. Neither the name of the University nor the names of its
  18*     contributors may be used to endorse or promote products derived
  19*     from this software without specific prior written permission.
  20*
  21*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23*  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24*  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25*  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28*  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29*  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30*  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32*
  33*/
  34
  35#include <linux/file.h>
  36#include <linux/fs.h>
  37#include <linux/slab.h>
  38#include <linux/namei.h>
  39#include <linux/swap.h>
  40#include <linux/pagemap.h>
  41#include <linux/ratelimit.h>
  42#include <linux/sunrpc/svcauth_gss.h>
  43#include <linux/sunrpc/addr.h>
  44#include <linux/jhash.h>
  45#include <linux/string_helpers.h>
  46#include <linux/fsnotify.h>
  47#include <linux/rhashtable.h>
  48#include <linux/nfs_ssc.h>
  49
  50#include "xdr4.h"
  51#include "xdr4cb.h"
  52#include "vfs.h"
  53#include "current_stateid.h"
  54
  55#include "netns.h"
  56#include "pnfs.h"
  57#include "filecache.h"
  58#include "trace.h"
  59
  60#define NFSDDBG_FACILITY                NFSDDBG_PROC
  61
  62#define all_ones {{ ~0, ~0}, ~0}
  63static const stateid_t one_stateid = {
  64	.si_generation = ~0,
  65	.si_opaque = all_ones,
  66};
  67static const stateid_t zero_stateid = {
  68	/* all fields zero */
  69};
  70static const stateid_t currentstateid = {
  71	.si_generation = 1,
  72};
  73static const stateid_t close_stateid = {
  74	.si_generation = 0xffffffffU,
  75};
  76
  77static u64 current_sessionid = 1;
  78
  79#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  80#define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  81#define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  82#define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
  83
  84/* forward declarations */
  85static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
  86static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
  87void nfsd4_end_grace(struct nfsd_net *nn);
  88static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
  89static void nfsd4_file_hash_remove(struct nfs4_file *fi);
  90static void deleg_reaper(struct nfsd_net *nn);
  91
  92/* Locking: */
  93
  94/*
  95 * Currently used for the del_recall_lru and file hash table.  In an
  96 * effort to decrease the scope of the client_mutex, this spinlock may
  97 * eventually cover more:
  98 */
  99static DEFINE_SPINLOCK(state_lock);
 100
 101enum nfsd4_st_mutex_lock_subclass {
 102	OPEN_STATEID_MUTEX = 0,
 103	LOCK_STATEID_MUTEX = 1,
 104};
 105
 106/*
 107 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
 108 * the refcount on the open stateid to drop.
 109 */
 110static DECLARE_WAIT_QUEUE_HEAD(close_wq);
 111
 112/*
 113 * A waitqueue where a writer to clients/#/ctl destroying a client can
 114 * wait for cl_rpc_users to drop to 0 and then for the client to be
 115 * unhashed.
 116 */
 117static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
 118
 119static struct kmem_cache *client_slab;
 120static struct kmem_cache *openowner_slab;
 121static struct kmem_cache *lockowner_slab;
 122static struct kmem_cache *file_slab;
 123static struct kmem_cache *stateid_slab;
 124static struct kmem_cache *deleg_slab;
 125static struct kmem_cache *odstate_slab;
 126
 127static void free_session(struct nfsd4_session *);
 128
 129static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
 130static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
 131static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops;
 132
 133static struct workqueue_struct *laundry_wq;
 134
 135int nfsd4_create_laundry_wq(void)
 136{
 137	int rc = 0;
 138
 139	laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
 140	if (laundry_wq == NULL)
 141		rc = -ENOMEM;
 142	return rc;
 143}
 144
 145void nfsd4_destroy_laundry_wq(void)
 146{
 147	destroy_workqueue(laundry_wq);
 148}
 149
 150static bool is_session_dead(struct nfsd4_session *ses)
 151{
 152	return ses->se_flags & NFS4_SESSION_DEAD;
 153}
 154
 155static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 156{
 157	if (atomic_read(&ses->se_ref) > ref_held_by_me)
 158		return nfserr_jukebox;
 159	ses->se_flags |= NFS4_SESSION_DEAD;
 160	return nfs_ok;
 161}
 162
 163static bool is_client_expired(struct nfs4_client *clp)
 164{
 165	return clp->cl_time == 0;
 166}
 167
 168static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
 169					struct nfs4_client *clp)
 170{
 171	if (clp->cl_state != NFSD4_ACTIVE)
 172		atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
 173}
 174
 175static __be32 get_client_locked(struct nfs4_client *clp)
 176{
 177	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 178
 179	lockdep_assert_held(&nn->client_lock);
 180
 181	if (is_client_expired(clp))
 182		return nfserr_expired;
 183	atomic_inc(&clp->cl_rpc_users);
 184	nfsd4_dec_courtesy_client_count(nn, clp);
 185	clp->cl_state = NFSD4_ACTIVE;
 186	return nfs_ok;
 187}
 188
 189/* must be called under the client_lock */
 190static inline void
 191renew_client_locked(struct nfs4_client *clp)
 192{
 193	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 194
 195	if (is_client_expired(clp)) {
 196		WARN_ON(1);
 197		printk("%s: client (clientid %08x/%08x) already expired\n",
 198			__func__,
 199			clp->cl_clientid.cl_boot,
 200			clp->cl_clientid.cl_id);
 201		return;
 202	}
 203
 
 
 
 204	list_move_tail(&clp->cl_lru, &nn->client_lru);
 205	clp->cl_time = ktime_get_boottime_seconds();
 206	nfsd4_dec_courtesy_client_count(nn, clp);
 207	clp->cl_state = NFSD4_ACTIVE;
 208}
 209
 210static void put_client_renew_locked(struct nfs4_client *clp)
 211{
 212	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 213
 214	lockdep_assert_held(&nn->client_lock);
 215
 216	if (!atomic_dec_and_test(&clp->cl_rpc_users))
 217		return;
 218	if (!is_client_expired(clp))
 219		renew_client_locked(clp);
 220	else
 221		wake_up_all(&expiry_wq);
 222}
 223
 224static void put_client_renew(struct nfs4_client *clp)
 225{
 226	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 227
 228	if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
 229		return;
 230	if (!is_client_expired(clp))
 231		renew_client_locked(clp);
 232	else
 233		wake_up_all(&expiry_wq);
 234	spin_unlock(&nn->client_lock);
 235}
 236
 237static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 238{
 239	__be32 status;
 240
 241	if (is_session_dead(ses))
 242		return nfserr_badsession;
 243	status = get_client_locked(ses->se_client);
 244	if (status)
 245		return status;
 246	atomic_inc(&ses->se_ref);
 247	return nfs_ok;
 248}
 249
 250static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 251{
 252	struct nfs4_client *clp = ses->se_client;
 253	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 254
 255	lockdep_assert_held(&nn->client_lock);
 256
 257	if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 258		free_session(ses);
 259	put_client_renew_locked(clp);
 260}
 261
 262static void nfsd4_put_session(struct nfsd4_session *ses)
 263{
 264	struct nfs4_client *clp = ses->se_client;
 265	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 266
 267	spin_lock(&nn->client_lock);
 268	nfsd4_put_session_locked(ses);
 269	spin_unlock(&nn->client_lock);
 270}
 271
 272static struct nfsd4_blocked_lock *
 273find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 274			struct nfsd_net *nn)
 275{
 276	struct nfsd4_blocked_lock *cur, *found = NULL;
 277
 278	spin_lock(&nn->blocked_locks_lock);
 279	list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
 280		if (fh_match(fh, &cur->nbl_fh)) {
 281			list_del_init(&cur->nbl_list);
 282			WARN_ON(list_empty(&cur->nbl_lru));
 283			list_del_init(&cur->nbl_lru);
 284			found = cur;
 285			break;
 286		}
 287	}
 288	spin_unlock(&nn->blocked_locks_lock);
 289	if (found)
 290		locks_delete_block(&found->nbl_lock);
 291	return found;
 292}
 293
 294static struct nfsd4_blocked_lock *
 295find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 296			struct nfsd_net *nn)
 297{
 298	struct nfsd4_blocked_lock *nbl;
 299
 300	nbl = find_blocked_lock(lo, fh, nn);
 301	if (!nbl) {
 302		nbl = kmalloc(sizeof(*nbl), GFP_KERNEL);
 303		if (nbl) {
 304			INIT_LIST_HEAD(&nbl->nbl_list);
 305			INIT_LIST_HEAD(&nbl->nbl_lru);
 306			fh_copy_shallow(&nbl->nbl_fh, fh);
 307			locks_init_lock(&nbl->nbl_lock);
 308			kref_init(&nbl->nbl_kref);
 309			nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
 310					&nfsd4_cb_notify_lock_ops,
 311					NFSPROC4_CLNT_CB_NOTIFY_LOCK);
 312		}
 313	}
 314	return nbl;
 315}
 316
 317static void
 318free_nbl(struct kref *kref)
 319{
 320	struct nfsd4_blocked_lock *nbl;
 321
 322	nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
 323	locks_release_private(&nbl->nbl_lock);
 324	kfree(nbl);
 325}
 326
 327static void
 328free_blocked_lock(struct nfsd4_blocked_lock *nbl)
 329{
 330	locks_delete_block(&nbl->nbl_lock);
 331	kref_put(&nbl->nbl_kref, free_nbl);
 332}
 333
 334static void
 335remove_blocked_locks(struct nfs4_lockowner *lo)
 336{
 337	struct nfs4_client *clp = lo->lo_owner.so_client;
 338	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 339	struct nfsd4_blocked_lock *nbl;
 340	LIST_HEAD(reaplist);
 341
 342	/* Dequeue all blocked locks */
 343	spin_lock(&nn->blocked_locks_lock);
 344	while (!list_empty(&lo->lo_blocked)) {
 345		nbl = list_first_entry(&lo->lo_blocked,
 346					struct nfsd4_blocked_lock,
 347					nbl_list);
 348		list_del_init(&nbl->nbl_list);
 349		WARN_ON(list_empty(&nbl->nbl_lru));
 350		list_move(&nbl->nbl_lru, &reaplist);
 351	}
 352	spin_unlock(&nn->blocked_locks_lock);
 353
 354	/* Now free them */
 355	while (!list_empty(&reaplist)) {
 356		nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
 357					nbl_lru);
 358		list_del_init(&nbl->nbl_lru);
 
 359		free_blocked_lock(nbl);
 360	}
 361}
 362
 363static void
 364nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
 365{
 366	struct nfsd4_blocked_lock	*nbl = container_of(cb,
 367						struct nfsd4_blocked_lock, nbl_cb);
 368	locks_delete_block(&nbl->nbl_lock);
 369}
 370
 371static int
 372nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
 373{
 374	trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
 375
 376	/*
 377	 * Since this is just an optimization, we don't try very hard if it
 378	 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
 379	 * just quit trying on anything else.
 380	 */
 381	switch (task->tk_status) {
 382	case -NFS4ERR_DELAY:
 383		rpc_delay(task, 1 * HZ);
 384		return 0;
 385	default:
 386		return 1;
 387	}
 388}
 389
 390static void
 391nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
 392{
 393	struct nfsd4_blocked_lock	*nbl = container_of(cb,
 394						struct nfsd4_blocked_lock, nbl_cb);
 395
 396	free_blocked_lock(nbl);
 397}
 398
 399static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
 400	.prepare	= nfsd4_cb_notify_lock_prepare,
 401	.done		= nfsd4_cb_notify_lock_done,
 402	.release	= nfsd4_cb_notify_lock_release,
 403};
 404
 405/*
 406 * We store the NONE, READ, WRITE, and BOTH bits separately in the
 407 * st_{access,deny}_bmap field of the stateid, in order to track not
 408 * only what share bits are currently in force, but also what
 409 * combinations of share bits previous opens have used.  This allows us
 410 * to enforce the recommendation in
 411 * https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
 412 * the server return an error if the client attempt to downgrade to a
 413 * combination of share bits not explicable by closing some of its
 414 * previous opens.
 415 *
 416 * This enforcement is arguably incomplete, since we don't keep
 417 * track of access/deny bit combinations; so, e.g., we allow:
 418 *
 419 *	OPEN allow read, deny write
 420 *	OPEN allow both, deny none
 421 *	DOWNGRADE allow read, deny none
 422 *
 423 * which we should reject.
 424 *
 425 * But you could also argue that our current code is already overkill,
 426 * since it only exists to return NFS4ERR_INVAL on incorrect client
 427 * behavior.
 428 */
 429static unsigned int
 430bmap_to_share_mode(unsigned long bmap)
 431{
 432	int i;
 433	unsigned int access = 0;
 434
 435	for (i = 1; i < 4; i++) {
 436		if (test_bit(i, &bmap))
 437			access |= i;
 438	}
 439	return access;
 440}
 441
 442/* set share access for a given stateid */
 443static inline void
 444set_access(u32 access, struct nfs4_ol_stateid *stp)
 445{
 446	unsigned char mask = 1 << access;
 447
 448	WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 449	stp->st_access_bmap |= mask;
 450}
 451
 452/* clear share access for a given stateid */
 453static inline void
 454clear_access(u32 access, struct nfs4_ol_stateid *stp)
 455{
 456	unsigned char mask = 1 << access;
 457
 458	WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 459	stp->st_access_bmap &= ~mask;
 460}
 461
 462/* test whether a given stateid has access */
 463static inline bool
 464test_access(u32 access, struct nfs4_ol_stateid *stp)
 465{
 466	unsigned char mask = 1 << access;
 467
 468	return (bool)(stp->st_access_bmap & mask);
 469}
 470
 471/* set share deny for a given stateid */
 472static inline void
 473set_deny(u32 deny, struct nfs4_ol_stateid *stp)
 474{
 475	unsigned char mask = 1 << deny;
 476
 477	WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 478	stp->st_deny_bmap |= mask;
 479}
 480
 481/* clear share deny for a given stateid */
 482static inline void
 483clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
 484{
 485	unsigned char mask = 1 << deny;
 486
 487	WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 488	stp->st_deny_bmap &= ~mask;
 489}
 490
 491/* test whether a given stateid is denying specific access */
 492static inline bool
 493test_deny(u32 deny, struct nfs4_ol_stateid *stp)
 494{
 495	unsigned char mask = 1 << deny;
 496
 497	return (bool)(stp->st_deny_bmap & mask);
 498}
 499
 500static int nfs4_access_to_omode(u32 access)
 501{
 502	switch (access & NFS4_SHARE_ACCESS_BOTH) {
 503	case NFS4_SHARE_ACCESS_READ:
 504		return O_RDONLY;
 505	case NFS4_SHARE_ACCESS_WRITE:
 506		return O_WRONLY;
 507	case NFS4_SHARE_ACCESS_BOTH:
 508		return O_RDWR;
 509	}
 510	WARN_ON_ONCE(1);
 511	return O_RDONLY;
 512}
 513
 514static inline int
 515access_permit_read(struct nfs4_ol_stateid *stp)
 516{
 517	return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
 518		test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
 519		test_access(NFS4_SHARE_ACCESS_WRITE, stp);
 520}
 521
 522static inline int
 523access_permit_write(struct nfs4_ol_stateid *stp)
 524{
 525	return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
 526		test_access(NFS4_SHARE_ACCESS_BOTH, stp);
 527}
 528
 529static inline struct nfs4_stateowner *
 530nfs4_get_stateowner(struct nfs4_stateowner *sop)
 531{
 532	atomic_inc(&sop->so_count);
 533	return sop;
 534}
 535
 536static int
 537same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
 538{
 539	return (sop->so_owner.len == owner->len) &&
 540		0 == memcmp(sop->so_owner.data, owner->data, owner->len);
 541}
 542
 543static struct nfs4_openowner *
 544find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
 545			struct nfs4_client *clp)
 546{
 547	struct nfs4_stateowner *so;
 548
 549	lockdep_assert_held(&clp->cl_lock);
 550
 551	list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
 552			    so_strhash) {
 553		if (!so->so_is_open_owner)
 554			continue;
 555		if (same_owner_str(so, &open->op_owner))
 556			return openowner(nfs4_get_stateowner(so));
 557	}
 558	return NULL;
 559}
 560
 561static struct nfs4_openowner *
 562find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
 563			struct nfs4_client *clp)
 564{
 565	struct nfs4_openowner *oo;
 566
 567	spin_lock(&clp->cl_lock);
 568	oo = find_openstateowner_str_locked(hashval, open, clp);
 569	spin_unlock(&clp->cl_lock);
 570	return oo;
 571}
 572
 573static inline u32
 574opaque_hashval(const void *ptr, int nbytes)
 575{
 576	unsigned char *cptr = (unsigned char *) ptr;
 577
 578	u32 x = 0;
 579	while (nbytes--) {
 580		x *= 37;
 581		x += *cptr++;
 582	}
 583	return x;
 584}
 585
 586static void nfsd4_free_file_rcu(struct rcu_head *rcu)
 587{
 588	struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
 589
 590	kmem_cache_free(file_slab, fp);
 591}
 592
 593void
 594put_nfs4_file(struct nfs4_file *fi)
 595{
 596	if (refcount_dec_and_test(&fi->fi_ref)) {
 597		nfsd4_file_hash_remove(fi);
 
 
 
 598		WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
 599		WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
 600		call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
 601	}
 602}
 603
 604static struct nfsd_file *
 
 
 
 
 
 
 
 
 605find_writeable_file_locked(struct nfs4_file *f)
 606{
 607	struct nfsd_file *ret;
 608
 609	lockdep_assert_held(&f->fi_lock);
 610
 611	ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
 612	if (!ret)
 613		ret = nfsd_file_get(f->fi_fds[O_RDWR]);
 614	return ret;
 615}
 616
 617static struct nfsd_file *
 618find_writeable_file(struct nfs4_file *f)
 619{
 620	struct nfsd_file *ret;
 621
 622	spin_lock(&f->fi_lock);
 623	ret = find_writeable_file_locked(f);
 624	spin_unlock(&f->fi_lock);
 625
 626	return ret;
 627}
 628
 629static struct nfsd_file *
 630find_readable_file_locked(struct nfs4_file *f)
 631{
 632	struct nfsd_file *ret;
 633
 634	lockdep_assert_held(&f->fi_lock);
 635
 636	ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
 637	if (!ret)
 638		ret = nfsd_file_get(f->fi_fds[O_RDWR]);
 639	return ret;
 640}
 641
 642static struct nfsd_file *
 643find_readable_file(struct nfs4_file *f)
 644{
 645	struct nfsd_file *ret;
 646
 647	spin_lock(&f->fi_lock);
 648	ret = find_readable_file_locked(f);
 649	spin_unlock(&f->fi_lock);
 650
 651	return ret;
 652}
 653
 654static struct nfsd_file *
 655find_rw_file(struct nfs4_file *f)
 656{
 657	struct nfsd_file *ret;
 658
 659	spin_lock(&f->fi_lock);
 660	ret = nfsd_file_get(f->fi_fds[O_RDWR]);
 661	spin_unlock(&f->fi_lock);
 662
 663	return ret;
 664}
 665
 666struct nfsd_file *
 667find_any_file(struct nfs4_file *f)
 668{
 669	struct nfsd_file *ret;
 670
 671	if (!f)
 672		return NULL;
 673	spin_lock(&f->fi_lock);
 674	ret = nfsd_file_get(f->fi_fds[O_RDWR]);
 675	if (!ret) {
 676		ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
 677		if (!ret)
 678			ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
 679	}
 680	spin_unlock(&f->fi_lock);
 681	return ret;
 682}
 683
 684static struct nfsd_file *find_any_file_locked(struct nfs4_file *f)
 685{
 686	lockdep_assert_held(&f->fi_lock);
 687
 688	if (f->fi_fds[O_RDWR])
 689		return f->fi_fds[O_RDWR];
 690	if (f->fi_fds[O_WRONLY])
 691		return f->fi_fds[O_WRONLY];
 692	if (f->fi_fds[O_RDONLY])
 693		return f->fi_fds[O_RDONLY];
 694	return NULL;
 695}
 696
 697static atomic_long_t num_delegations;
 698unsigned long max_delegations;
 699
 700/*
 701 * Open owner state (share locks)
 702 */
 703
 704/* hash tables for lock and open owners */
 705#define OWNER_HASH_BITS              8
 706#define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 707#define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 708
 709static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
 710{
 711	unsigned int ret;
 712
 713	ret = opaque_hashval(ownername->data, ownername->len);
 714	return ret & OWNER_HASH_MASK;
 715}
 716
 717static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp;
 
 
 718
 719static const struct rhashtable_params nfs4_file_rhash_params = {
 720	.key_len		= sizeof_field(struct nfs4_file, fi_inode),
 721	.key_offset		= offsetof(struct nfs4_file, fi_inode),
 722	.head_offset		= offsetof(struct nfs4_file, fi_rlist),
 723
 724	/*
 725	 * Start with a single page hash table to reduce resizing churn
 726	 * on light workloads.
 727	 */
 728	.min_size		= 256,
 729	.automatic_shrinking	= true,
 730};
 731
 732/*
 733 * Check if courtesy clients have conflicting access and resolve it if possible
 734 *
 735 * access:  is op_share_access if share_access is true.
 736 *	    Check if access mode, op_share_access, would conflict with
 737 *	    the current deny mode of the file 'fp'.
 738 * access:  is op_share_deny if share_access is false.
 739 *	    Check if the deny mode, op_share_deny, would conflict with
 740 *	    current access of the file 'fp'.
 741 * stp:     skip checking this entry.
 742 * new_stp: normal open, not open upgrade.
 743 *
 744 * Function returns:
 745 *	false - access/deny mode conflict with normal client.
 746 *	true  - no conflict or conflict with courtesy client(s) is resolved.
 747 */
 748static bool
 749nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
 750		struct nfs4_ol_stateid *stp, u32 access, bool share_access)
 751{
 752	struct nfs4_ol_stateid *st;
 753	bool resolvable = true;
 754	unsigned char bmap;
 755	struct nfsd_net *nn;
 756	struct nfs4_client *clp;
 757
 758	lockdep_assert_held(&fp->fi_lock);
 759	list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
 760		/* ignore lock stateid */
 761		if (st->st_openstp)
 762			continue;
 763		if (st == stp && new_stp)
 764			continue;
 765		/* check file access against deny mode or vice versa */
 766		bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
 767		if (!(access & bmap_to_share_mode(bmap)))
 768			continue;
 769		clp = st->st_stid.sc_client;
 770		if (try_to_expire_client(clp))
 771			continue;
 772		resolvable = false;
 773		break;
 774	}
 775	if (resolvable) {
 776		clp = stp->st_stid.sc_client;
 777		nn = net_generic(clp->net, nfsd_net_id);
 778		mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
 779	}
 780	return resolvable;
 781}
 782
 
 
 783static void
 784__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 785{
 786	lockdep_assert_held(&fp->fi_lock);
 787
 788	if (access & NFS4_SHARE_ACCESS_WRITE)
 789		atomic_inc(&fp->fi_access[O_WRONLY]);
 790	if (access & NFS4_SHARE_ACCESS_READ)
 791		atomic_inc(&fp->fi_access[O_RDONLY]);
 792}
 793
 794static __be32
 795nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 796{
 797	lockdep_assert_held(&fp->fi_lock);
 798
 799	/* Does this access mode make sense? */
 800	if (access & ~NFS4_SHARE_ACCESS_BOTH)
 801		return nfserr_inval;
 802
 803	/* Does it conflict with a deny mode already set? */
 804	if ((access & fp->fi_share_deny) != 0)
 805		return nfserr_share_denied;
 806
 807	__nfs4_file_get_access(fp, access);
 808	return nfs_ok;
 809}
 810
 811static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
 812{
 813	/* Common case is that there is no deny mode. */
 814	if (deny) {
 815		/* Does this deny mode make sense? */
 816		if (deny & ~NFS4_SHARE_DENY_BOTH)
 817			return nfserr_inval;
 818
 819		if ((deny & NFS4_SHARE_DENY_READ) &&
 820		    atomic_read(&fp->fi_access[O_RDONLY]))
 821			return nfserr_share_denied;
 822
 823		if ((deny & NFS4_SHARE_DENY_WRITE) &&
 824		    atomic_read(&fp->fi_access[O_WRONLY]))
 825			return nfserr_share_denied;
 826	}
 827	return nfs_ok;
 828}
 829
 830static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 831{
 832	might_lock(&fp->fi_lock);
 833
 834	if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
 835		struct nfsd_file *f1 = NULL;
 836		struct nfsd_file *f2 = NULL;
 837
 838		swap(f1, fp->fi_fds[oflag]);
 839		if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 840			swap(f2, fp->fi_fds[O_RDWR]);
 841		spin_unlock(&fp->fi_lock);
 842		if (f1)
 843			nfsd_file_put(f1);
 844		if (f2)
 845			nfsd_file_put(f2);
 846	}
 847}
 848
 849static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
 850{
 851	WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
 852
 853	if (access & NFS4_SHARE_ACCESS_WRITE)
 854		__nfs4_file_put_access(fp, O_WRONLY);
 855	if (access & NFS4_SHARE_ACCESS_READ)
 856		__nfs4_file_put_access(fp, O_RDONLY);
 857}
 858
 859/*
 860 * Allocate a new open/delegation state counter. This is needed for
 861 * pNFS for proper return on close semantics.
 862 *
 863 * Note that we only allocate it for pNFS-enabled exports, otherwise
 864 * all pointers to struct nfs4_clnt_odstate are always NULL.
 865 */
 866static struct nfs4_clnt_odstate *
 867alloc_clnt_odstate(struct nfs4_client *clp)
 868{
 869	struct nfs4_clnt_odstate *co;
 870
 871	co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
 872	if (co) {
 873		co->co_client = clp;
 874		refcount_set(&co->co_odcount, 1);
 875	}
 876	return co;
 877}
 878
 879static void
 880hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
 881{
 882	struct nfs4_file *fp = co->co_file;
 883
 884	lockdep_assert_held(&fp->fi_lock);
 885	list_add(&co->co_perfile, &fp->fi_clnt_odstate);
 886}
 887
 888static inline void
 889get_clnt_odstate(struct nfs4_clnt_odstate *co)
 890{
 891	if (co)
 892		refcount_inc(&co->co_odcount);
 893}
 894
 895static void
 896put_clnt_odstate(struct nfs4_clnt_odstate *co)
 897{
 898	struct nfs4_file *fp;
 899
 900	if (!co)
 901		return;
 902
 903	fp = co->co_file;
 904	if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
 905		list_del(&co->co_perfile);
 906		spin_unlock(&fp->fi_lock);
 907
 908		nfsd4_return_all_file_layouts(co->co_client, fp);
 909		kmem_cache_free(odstate_slab, co);
 910	}
 911}
 912
 913static struct nfs4_clnt_odstate *
 914find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
 915{
 916	struct nfs4_clnt_odstate *co;
 917	struct nfs4_client *cl;
 918
 919	if (!new)
 920		return NULL;
 921
 922	cl = new->co_client;
 923
 924	spin_lock(&fp->fi_lock);
 925	list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
 926		if (co->co_client == cl) {
 927			get_clnt_odstate(co);
 928			goto out;
 929		}
 930	}
 931	co = new;
 932	co->co_file = fp;
 933	hash_clnt_odstate_locked(new);
 934out:
 935	spin_unlock(&fp->fi_lock);
 936	return co;
 937}
 938
 939struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
 940				  void (*sc_free)(struct nfs4_stid *))
 941{
 942	struct nfs4_stid *stid;
 943	int new_id;
 944
 945	stid = kmem_cache_zalloc(slab, GFP_KERNEL);
 946	if (!stid)
 947		return NULL;
 948
 949	idr_preload(GFP_KERNEL);
 950	spin_lock(&cl->cl_lock);
 951	/* Reserving 0 for start of file in nfsdfs "states" file: */
 952	new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
 953	spin_unlock(&cl->cl_lock);
 954	idr_preload_end();
 955	if (new_id < 0)
 956		goto out_free;
 957
 958	stid->sc_free = sc_free;
 959	stid->sc_client = cl;
 960	stid->sc_stateid.si_opaque.so_id = new_id;
 961	stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 962	/* Will be incremented before return to client: */
 963	refcount_set(&stid->sc_count, 1);
 964	spin_lock_init(&stid->sc_lock);
 965	INIT_LIST_HEAD(&stid->sc_cp_list);
 966
 967	/*
 968	 * It shouldn't be a problem to reuse an opaque stateid value.
 969	 * I don't think it is for 4.1.  But with 4.0 I worry that, for
 970	 * example, a stray write retransmission could be accepted by
 971	 * the server when it should have been rejected.  Therefore,
 972	 * adopt a trick from the sctp code to attempt to maximize the
 973	 * amount of time until an id is reused, by ensuring they always
 974	 * "increase" (mod INT_MAX):
 975	 */
 976	return stid;
 977out_free:
 978	kmem_cache_free(slab, stid);
 979	return NULL;
 980}
 981
 982/*
 983 * Create a unique stateid_t to represent each COPY.
 984 */
 985static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
 986			      unsigned char cs_type)
 987{
 988	int new_id;
 989
 990	stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
 991	stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
 992
 993	idr_preload(GFP_KERNEL);
 994	spin_lock(&nn->s2s_cp_lock);
 995	new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
 996	stid->cs_stid.si_opaque.so_id = new_id;
 997	stid->cs_stid.si_generation = 1;
 998	spin_unlock(&nn->s2s_cp_lock);
 999	idr_preload_end();
1000	if (new_id < 0)
1001		return 0;
1002	stid->cs_type = cs_type;
1003	return 1;
1004}
1005
1006int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
1007{
1008	return nfs4_init_cp_state(nn, &copy->cp_stateid, NFS4_COPY_STID);
1009}
1010
1011struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
1012						     struct nfs4_stid *p_stid)
1013{
1014	struct nfs4_cpntf_state *cps;
1015
1016	cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
1017	if (!cps)
1018		return NULL;
1019	cps->cpntf_time = ktime_get_boottime_seconds();
1020	refcount_set(&cps->cp_stateid.cs_count, 1);
1021	if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
1022		goto out_free;
1023	spin_lock(&nn->s2s_cp_lock);
1024	list_add(&cps->cp_list, &p_stid->sc_cp_list);
1025	spin_unlock(&nn->s2s_cp_lock);
1026	return cps;
1027out_free:
1028	kfree(cps);
1029	return NULL;
1030}
1031
1032void nfs4_free_copy_state(struct nfsd4_copy *copy)
1033{
1034	struct nfsd_net *nn;
1035
1036	if (copy->cp_stateid.cs_type != NFS4_COPY_STID)
1037		return;
1038	nn = net_generic(copy->cp_clp->net, nfsd_net_id);
1039	spin_lock(&nn->s2s_cp_lock);
1040	idr_remove(&nn->s2s_cp_stateids,
1041		   copy->cp_stateid.cs_stid.si_opaque.so_id);
1042	spin_unlock(&nn->s2s_cp_lock);
1043}
1044
1045static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
1046{
1047	struct nfs4_cpntf_state *cps;
1048	struct nfsd_net *nn;
1049
1050	nn = net_generic(net, nfsd_net_id);
1051	spin_lock(&nn->s2s_cp_lock);
1052	while (!list_empty(&stid->sc_cp_list)) {
1053		cps = list_first_entry(&stid->sc_cp_list,
1054				       struct nfs4_cpntf_state, cp_list);
1055		_free_cpntf_state_locked(nn, cps);
1056	}
1057	spin_unlock(&nn->s2s_cp_lock);
1058}
1059
1060static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
1061{
1062	struct nfs4_stid *stid;
1063
1064	stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
1065	if (!stid)
1066		return NULL;
1067
1068	return openlockstateid(stid);
1069}
1070
1071static void nfs4_free_deleg(struct nfs4_stid *stid)
1072{
1073	struct nfs4_delegation *dp = delegstateid(stid);
1074
1075	WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
1076	WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
1077	WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
1078	WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
1079	kmem_cache_free(deleg_slab, stid);
1080	atomic_long_dec(&num_delegations);
1081}
1082
1083/*
1084 * When we recall a delegation, we should be careful not to hand it
1085 * out again straight away.
1086 * To ensure this we keep a pair of bloom filters ('new' and 'old')
1087 * in which the filehandles of recalled delegations are "stored".
1088 * If a filehandle appear in either filter, a delegation is blocked.
1089 * When a delegation is recalled, the filehandle is stored in the "new"
1090 * filter.
1091 * Every 30 seconds we swap the filters and clear the "new" one,
1092 * unless both are empty of course.
1093 *
1094 * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
1095 * low 3 bytes as hash-table indices.
1096 *
1097 * 'blocked_delegations_lock', which is always taken in block_delegations(),
1098 * is used to manage concurrent access.  Testing does not need the lock
1099 * except when swapping the two filters.
1100 */
1101static DEFINE_SPINLOCK(blocked_delegations_lock);
1102static struct bloom_pair {
1103	int	entries, old_entries;
1104	time64_t swap_time;
1105	int	new; /* index into 'set' */
1106	DECLARE_BITMAP(set[2], 256);
1107} blocked_delegations;
1108
1109static int delegation_blocked(struct knfsd_fh *fh)
1110{
1111	u32 hash;
1112	struct bloom_pair *bd = &blocked_delegations;
1113
1114	if (bd->entries == 0)
1115		return 0;
1116	if (ktime_get_seconds() - bd->swap_time > 30) {
1117		spin_lock(&blocked_delegations_lock);
1118		if (ktime_get_seconds() - bd->swap_time > 30) {
1119			bd->entries -= bd->old_entries;
1120			bd->old_entries = bd->entries;
1121			memset(bd->set[bd->new], 0,
1122			       sizeof(bd->set[0]));
1123			bd->new = 1-bd->new;
1124			bd->swap_time = ktime_get_seconds();
1125		}
1126		spin_unlock(&blocked_delegations_lock);
1127	}
1128	hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1129	if (test_bit(hash&255, bd->set[0]) &&
1130	    test_bit((hash>>8)&255, bd->set[0]) &&
1131	    test_bit((hash>>16)&255, bd->set[0]))
1132		return 1;
1133
1134	if (test_bit(hash&255, bd->set[1]) &&
1135	    test_bit((hash>>8)&255, bd->set[1]) &&
1136	    test_bit((hash>>16)&255, bd->set[1]))
1137		return 1;
1138
1139	return 0;
1140}
1141
1142static void block_delegations(struct knfsd_fh *fh)
1143{
1144	u32 hash;
1145	struct bloom_pair *bd = &blocked_delegations;
1146
1147	hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1148
1149	spin_lock(&blocked_delegations_lock);
1150	__set_bit(hash&255, bd->set[bd->new]);
1151	__set_bit((hash>>8)&255, bd->set[bd->new]);
1152	__set_bit((hash>>16)&255, bd->set[bd->new]);
1153	if (bd->entries == 0)
1154		bd->swap_time = ktime_get_seconds();
1155	bd->entries += 1;
1156	spin_unlock(&blocked_delegations_lock);
1157}
1158
1159static struct nfs4_delegation *
1160alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1161		 struct nfs4_clnt_odstate *odstate, u32 dl_type)
 
1162{
1163	struct nfs4_delegation *dp;
1164	struct nfs4_stid *stid;
1165	long n;
1166
1167	dprintk("NFSD alloc_init_deleg\n");
1168	n = atomic_long_inc_return(&num_delegations);
1169	if (n < 0 || n > max_delegations)
1170		goto out_dec;
1171	if (delegation_blocked(&fp->fi_fhandle))
1172		goto out_dec;
1173	stid = nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg);
1174	if (stid == NULL)
1175		goto out_dec;
1176	dp = delegstateid(stid);
1177
1178	/*
1179	 * delegation seqid's are never incremented.  The 4.1 special
1180	 * meaning of seqid 0 isn't meaningful, really, but let's avoid
1181	 * 0 anyway just for consistency and use 1:
1182	 */
1183	dp->dl_stid.sc_stateid.si_generation = 1;
1184	INIT_LIST_HEAD(&dp->dl_perfile);
1185	INIT_LIST_HEAD(&dp->dl_perclnt);
1186	INIT_LIST_HEAD(&dp->dl_recall_lru);
1187	dp->dl_clnt_odstate = odstate;
1188	get_clnt_odstate(odstate);
1189	dp->dl_type = dl_type;
1190	dp->dl_retries = 1;
1191	dp->dl_recalled = false;
1192	nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
1193		      &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
1194	nfsd4_init_cb(&dp->dl_cb_fattr.ncf_getattr, dp->dl_stid.sc_client,
1195			&nfsd4_cb_getattr_ops, NFSPROC4_CLNT_CB_GETATTR);
1196	dp->dl_cb_fattr.ncf_file_modified = false;
1197	dp->dl_cb_fattr.ncf_cb_bmap[0] = FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE;
1198	get_nfs4_file(fp);
1199	dp->dl_stid.sc_file = fp;
1200	return dp;
1201out_dec:
1202	atomic_long_dec(&num_delegations);
1203	return NULL;
1204}
1205
1206void
1207nfs4_put_stid(struct nfs4_stid *s)
1208{
1209	struct nfs4_file *fp = s->sc_file;
1210	struct nfs4_client *clp = s->sc_client;
1211
1212	might_lock(&clp->cl_lock);
1213
1214	if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
1215		wake_up_all(&close_wq);
1216		return;
1217	}
1218	idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1219	if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
1220		atomic_dec(&s->sc_client->cl_admin_revoked);
1221	nfs4_free_cpntf_statelist(clp->net, s);
1222	spin_unlock(&clp->cl_lock);
1223	s->sc_free(s);
1224	if (fp)
1225		put_nfs4_file(fp);
1226}
1227
1228void
1229nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1230{
1231	stateid_t *src = &stid->sc_stateid;
1232
1233	spin_lock(&stid->sc_lock);
1234	if (unlikely(++src->si_generation == 0))
1235		src->si_generation = 1;
1236	memcpy(dst, src, sizeof(*dst));
1237	spin_unlock(&stid->sc_lock);
1238}
1239
1240static void put_deleg_file(struct nfs4_file *fp)
1241{
1242	struct nfsd_file *nf = NULL;
1243
1244	spin_lock(&fp->fi_lock);
1245	if (--fp->fi_delegees == 0)
1246		swap(nf, fp->fi_deleg_file);
1247	spin_unlock(&fp->fi_lock);
1248
1249	if (nf)
1250		nfsd_file_put(nf);
1251}
1252
1253static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1254{
1255	struct nfs4_file *fp = dp->dl_stid.sc_file;
1256	struct nfsd_file *nf = fp->fi_deleg_file;
1257
1258	WARN_ON_ONCE(!fp->fi_delegees);
1259
1260	kernel_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1261	put_deleg_file(fp);
1262}
1263
1264static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1265{
1266	put_clnt_odstate(dp->dl_clnt_odstate);
1267	nfs4_unlock_deleg_lease(dp);
1268	nfs4_put_stid(&dp->dl_stid);
1269}
1270
 
 
 
 
 
1271/**
1272 * nfs4_delegation_exists - Discover if this delegation already exists
1273 * @clp:     a pointer to the nfs4_client we're granting a delegation to
1274 * @fp:      a pointer to the nfs4_file we're granting a delegation on
1275 *
1276 * Return:
1277 *      On success: true iff an existing delegation is found
1278 */
1279
1280static bool
1281nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1282{
1283	struct nfs4_delegation *searchdp = NULL;
1284	struct nfs4_client *searchclp = NULL;
1285
1286	lockdep_assert_held(&state_lock);
1287	lockdep_assert_held(&fp->fi_lock);
1288
1289	list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1290		searchclp = searchdp->dl_stid.sc_client;
1291		if (clp == searchclp) {
1292			return true;
1293		}
1294	}
1295	return false;
1296}
1297
1298/**
1299 * hash_delegation_locked - Add a delegation to the appropriate lists
1300 * @dp:     a pointer to the nfs4_delegation we are adding.
1301 * @fp:     a pointer to the nfs4_file we're granting a delegation on
1302 *
1303 * Return:
1304 *      On success: NULL if the delegation was successfully hashed.
1305 *
1306 *      On error: -EAGAIN if one was previously granted to this
1307 *                 nfs4_client for this nfs4_file. Delegation is not hashed.
1308 *
1309 */
1310
1311static int
1312hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1313{
1314	struct nfs4_client *clp = dp->dl_stid.sc_client;
1315
1316	lockdep_assert_held(&state_lock);
1317	lockdep_assert_held(&fp->fi_lock);
1318	lockdep_assert_held(&clp->cl_lock);
1319
1320	if (nfs4_delegation_exists(clp, fp))
1321		return -EAGAIN;
1322	refcount_inc(&dp->dl_stid.sc_count);
1323	dp->dl_stid.sc_type = SC_TYPE_DELEG;
1324	list_add(&dp->dl_perfile, &fp->fi_delegations);
1325	list_add(&dp->dl_perclnt, &clp->cl_delegations);
1326	return 0;
1327}
1328
1329static bool delegation_hashed(struct nfs4_delegation *dp)
1330{
1331	return !(list_empty(&dp->dl_perfile));
1332}
1333
1334static bool
1335unhash_delegation_locked(struct nfs4_delegation *dp, unsigned short statusmask)
1336{
1337	struct nfs4_file *fp = dp->dl_stid.sc_file;
1338
1339	lockdep_assert_held(&state_lock);
1340
1341	if (!delegation_hashed(dp))
1342		return false;
1343
1344	if (statusmask == SC_STATUS_REVOKED &&
1345	    dp->dl_stid.sc_client->cl_minorversion == 0)
1346		statusmask = SC_STATUS_CLOSED;
1347	dp->dl_stid.sc_status |= statusmask;
1348	if (statusmask & SC_STATUS_ADMIN_REVOKED)
1349		atomic_inc(&dp->dl_stid.sc_client->cl_admin_revoked);
1350
1351	/* Ensure that deleg break won't try to requeue it */
1352	++dp->dl_time;
1353	spin_lock(&fp->fi_lock);
1354	list_del_init(&dp->dl_perclnt);
1355	list_del_init(&dp->dl_recall_lru);
1356	list_del_init(&dp->dl_perfile);
1357	spin_unlock(&fp->fi_lock);
1358	return true;
1359}
1360
1361static void destroy_delegation(struct nfs4_delegation *dp)
1362{
1363	bool unhashed;
1364
1365	spin_lock(&state_lock);
1366	unhashed = unhash_delegation_locked(dp, SC_STATUS_CLOSED);
1367	spin_unlock(&state_lock);
1368	if (unhashed)
1369		destroy_unhashed_deleg(dp);
1370}
1371
1372static void revoke_delegation(struct nfs4_delegation *dp)
1373{
1374	struct nfs4_client *clp = dp->dl_stid.sc_client;
1375
1376	WARN_ON(!list_empty(&dp->dl_recall_lru));
1377
1378	trace_nfsd_stid_revoke(&dp->dl_stid);
1379
1380	if (dp->dl_stid.sc_status &
1381	    (SC_STATUS_REVOKED | SC_STATUS_ADMIN_REVOKED)) {
1382		spin_lock(&clp->cl_lock);
1383		refcount_inc(&dp->dl_stid.sc_count);
 
1384		list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1385		spin_unlock(&clp->cl_lock);
1386	}
1387	destroy_unhashed_deleg(dp);
1388}
1389
1390/*
1391 * SETCLIENTID state
1392 */
1393
1394static unsigned int clientid_hashval(u32 id)
1395{
1396	return id & CLIENT_HASH_MASK;
1397}
1398
1399static unsigned int clientstr_hashval(struct xdr_netobj name)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1400{
1401	return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
 
 
 
 
 
 
 
 
 
1402}
1403
1404/*
1405 * A stateid that had a deny mode associated with it is being released
1406 * or downgraded. Recalculate the deny mode on the file.
1407 */
1408static void
1409recalculate_deny_mode(struct nfs4_file *fp)
1410{
1411	struct nfs4_ol_stateid *stp;
1412
1413	spin_lock(&fp->fi_lock);
1414	fp->fi_share_deny = 0;
1415	list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1416		fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1417	spin_unlock(&fp->fi_lock);
1418}
1419
1420static void
1421reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1422{
1423	int i;
1424	bool change = false;
1425
1426	for (i = 1; i < 4; i++) {
1427		if ((i & deny) != i) {
1428			change = true;
1429			clear_deny(i, stp);
1430		}
1431	}
1432
1433	/* Recalculate per-file deny mode if there was a change */
1434	if (change)
1435		recalculate_deny_mode(stp->st_stid.sc_file);
1436}
1437
1438/* release all access and file references for a given stateid */
1439static void
1440release_all_access(struct nfs4_ol_stateid *stp)
1441{
1442	int i;
1443	struct nfs4_file *fp = stp->st_stid.sc_file;
1444
1445	if (fp && stp->st_deny_bmap != 0)
1446		recalculate_deny_mode(fp);
1447
1448	for (i = 1; i < 4; i++) {
1449		if (test_access(i, stp))
1450			nfs4_file_put_access(stp->st_stid.sc_file, i);
1451		clear_access(i, stp);
1452	}
1453}
1454
1455static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1456{
1457	kfree(sop->so_owner.data);
1458	sop->so_ops->so_free(sop);
1459}
1460
1461static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1462{
1463	struct nfs4_client *clp = sop->so_client;
1464
1465	might_lock(&clp->cl_lock);
1466
1467	if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1468		return;
1469	sop->so_ops->so_unhash(sop);
1470	spin_unlock(&clp->cl_lock);
1471	nfs4_free_stateowner(sop);
1472}
1473
1474static bool
1475nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1476{
1477	return list_empty(&stp->st_perfile);
1478}
1479
1480static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1481{
1482	struct nfs4_file *fp = stp->st_stid.sc_file;
1483
1484	lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1485
1486	if (list_empty(&stp->st_perfile))
1487		return false;
1488
1489	spin_lock(&fp->fi_lock);
1490	list_del_init(&stp->st_perfile);
1491	spin_unlock(&fp->fi_lock);
1492	list_del(&stp->st_perstateowner);
1493	return true;
1494}
1495
1496static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1497{
1498	struct nfs4_ol_stateid *stp = openlockstateid(stid);
1499
1500	put_clnt_odstate(stp->st_clnt_odstate);
1501	release_all_access(stp);
1502	if (stp->st_stateowner)
1503		nfs4_put_stateowner(stp->st_stateowner);
1504	WARN_ON(!list_empty(&stid->sc_cp_list));
1505	kmem_cache_free(stateid_slab, stid);
1506}
1507
1508static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1509{
1510	struct nfs4_ol_stateid *stp = openlockstateid(stid);
1511	struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1512	struct nfsd_file *nf;
1513
1514	nf = find_any_file(stp->st_stid.sc_file);
1515	if (nf) {
1516		get_file(nf->nf_file);
1517		filp_close(nf->nf_file, (fl_owner_t)lo);
1518		nfsd_file_put(nf);
1519	}
1520	nfs4_free_ol_stateid(stid);
1521}
1522
1523/*
1524 * Put the persistent reference to an already unhashed generic stateid, while
1525 * holding the cl_lock. If it's the last reference, then put it onto the
1526 * reaplist for later destruction.
1527 */
1528static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1529				       struct list_head *reaplist)
1530{
1531	struct nfs4_stid *s = &stp->st_stid;
1532	struct nfs4_client *clp = s->sc_client;
1533
1534	lockdep_assert_held(&clp->cl_lock);
1535
1536	WARN_ON_ONCE(!list_empty(&stp->st_locks));
1537
1538	if (!refcount_dec_and_test(&s->sc_count)) {
1539		wake_up_all(&close_wq);
1540		return;
1541	}
1542
1543	idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1544	if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
1545		atomic_dec(&s->sc_client->cl_admin_revoked);
1546	list_add(&stp->st_locks, reaplist);
1547}
1548
1549static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1550{
1551	lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1552
1553	if (!unhash_ol_stateid(stp))
1554		return false;
1555	list_del_init(&stp->st_locks);
1556	stp->st_stid.sc_status |= SC_STATUS_CLOSED;
1557	return true;
1558}
1559
1560static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1561{
1562	struct nfs4_client *clp = stp->st_stid.sc_client;
1563	bool unhashed;
1564
1565	spin_lock(&clp->cl_lock);
1566	unhashed = unhash_lock_stateid(stp);
1567	spin_unlock(&clp->cl_lock);
1568	if (unhashed)
1569		nfs4_put_stid(&stp->st_stid);
1570}
1571
1572static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1573{
1574	struct nfs4_client *clp = lo->lo_owner.so_client;
1575
1576	lockdep_assert_held(&clp->cl_lock);
1577
1578	list_del_init(&lo->lo_owner.so_strhash);
1579}
1580
1581/*
1582 * Free a list of generic stateids that were collected earlier after being
1583 * fully unhashed.
1584 */
1585static void
1586free_ol_stateid_reaplist(struct list_head *reaplist)
1587{
1588	struct nfs4_ol_stateid *stp;
1589	struct nfs4_file *fp;
1590
1591	might_sleep();
1592
1593	while (!list_empty(reaplist)) {
1594		stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1595				       st_locks);
1596		list_del(&stp->st_locks);
1597		fp = stp->st_stid.sc_file;
1598		stp->st_stid.sc_free(&stp->st_stid);
1599		if (fp)
1600			put_nfs4_file(fp);
1601	}
1602}
1603
1604static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1605				       struct list_head *reaplist)
1606{
1607	struct nfs4_ol_stateid *stp;
1608
1609	lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1610
1611	while (!list_empty(&open_stp->st_locks)) {
1612		stp = list_entry(open_stp->st_locks.next,
1613				struct nfs4_ol_stateid, st_locks);
1614		unhash_lock_stateid(stp);
1615		put_ol_stateid_locked(stp, reaplist);
1616	}
1617}
1618
1619static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1620				struct list_head *reaplist)
1621{
 
 
1622	lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1623
1624	if (!unhash_ol_stateid(stp))
1625		return false;
1626	release_open_stateid_locks(stp, reaplist);
1627	return true;
1628}
1629
1630static void release_open_stateid(struct nfs4_ol_stateid *stp)
1631{
1632	LIST_HEAD(reaplist);
1633
1634	spin_lock(&stp->st_stid.sc_client->cl_lock);
1635	stp->st_stid.sc_status |= SC_STATUS_CLOSED;
1636	if (unhash_open_stateid(stp, &reaplist))
1637		put_ol_stateid_locked(stp, &reaplist);
1638	spin_unlock(&stp->st_stid.sc_client->cl_lock);
1639	free_ol_stateid_reaplist(&reaplist);
1640}
1641
1642static void unhash_openowner_locked(struct nfs4_openowner *oo)
1643{
1644	struct nfs4_client *clp = oo->oo_owner.so_client;
1645
1646	lockdep_assert_held(&clp->cl_lock);
1647
1648	list_del_init(&oo->oo_owner.so_strhash);
1649	list_del_init(&oo->oo_perclient);
1650}
1651
1652static void release_last_closed_stateid(struct nfs4_openowner *oo)
1653{
1654	struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1655					  nfsd_net_id);
1656	struct nfs4_ol_stateid *s;
1657
1658	spin_lock(&nn->client_lock);
1659	s = oo->oo_last_closed_stid;
1660	if (s) {
1661		list_del_init(&oo->oo_close_lru);
1662		oo->oo_last_closed_stid = NULL;
1663	}
1664	spin_unlock(&nn->client_lock);
1665	if (s)
1666		nfs4_put_stid(&s->st_stid);
1667}
1668
1669static void release_openowner(struct nfs4_openowner *oo)
1670{
1671	struct nfs4_ol_stateid *stp;
1672	struct nfs4_client *clp = oo->oo_owner.so_client;
1673	struct list_head reaplist;
1674
1675	INIT_LIST_HEAD(&reaplist);
1676
1677	spin_lock(&clp->cl_lock);
1678	unhash_openowner_locked(oo);
1679	while (!list_empty(&oo->oo_owner.so_stateids)) {
1680		stp = list_first_entry(&oo->oo_owner.so_stateids,
1681				struct nfs4_ol_stateid, st_perstateowner);
1682		if (unhash_open_stateid(stp, &reaplist))
1683			put_ol_stateid_locked(stp, &reaplist);
1684	}
1685	spin_unlock(&clp->cl_lock);
1686	free_ol_stateid_reaplist(&reaplist);
1687	release_last_closed_stateid(oo);
1688	nfs4_put_stateowner(&oo->oo_owner);
1689}
1690
1691static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp,
1692					  struct super_block *sb,
1693					  unsigned int sc_types)
1694{
1695	unsigned long id, tmp;
1696	struct nfs4_stid *stid;
1697
1698	spin_lock(&clp->cl_lock);
1699	idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
1700		if ((stid->sc_type & sc_types) &&
1701		    stid->sc_status == 0 &&
1702		    stid->sc_file->fi_inode->i_sb == sb) {
1703			refcount_inc(&stid->sc_count);
1704			break;
1705		}
1706	spin_unlock(&clp->cl_lock);
1707	return stid;
1708}
1709
1710/**
1711 * nfsd4_revoke_states - revoke all nfsv4 states associated with given filesystem
1712 * @net:  used to identify instance of nfsd (there is one per net namespace)
1713 * @sb:   super_block used to identify target filesystem
1714 *
1715 * All nfs4 states (open, lock, delegation, layout) held by the server instance
1716 * and associated with a file on the given filesystem will be revoked resulting
1717 * in any files being closed and so all references from nfsd to the filesystem
1718 * being released.  Thus nfsd will no longer prevent the filesystem from being
1719 * unmounted.
1720 *
1721 * The clients which own the states will subsequently being notified that the
1722 * states have been "admin-revoked".
1723 */
1724void nfsd4_revoke_states(struct net *net, struct super_block *sb)
1725{
1726	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1727	unsigned int idhashval;
1728	unsigned int sc_types;
1729
1730	sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
1731
1732	spin_lock(&nn->client_lock);
1733	for (idhashval = 0; idhashval < CLIENT_HASH_MASK; idhashval++) {
1734		struct list_head *head = &nn->conf_id_hashtbl[idhashval];
1735		struct nfs4_client *clp;
1736	retry:
1737		list_for_each_entry(clp, head, cl_idhash) {
1738			struct nfs4_stid *stid = find_one_sb_stid(clp, sb,
1739								  sc_types);
1740			if (stid) {
1741				struct nfs4_ol_stateid *stp;
1742				struct nfs4_delegation *dp;
1743				struct nfs4_layout_stateid *ls;
1744
1745				spin_unlock(&nn->client_lock);
1746				switch (stid->sc_type) {
1747				case SC_TYPE_OPEN:
1748					stp = openlockstateid(stid);
1749					mutex_lock_nested(&stp->st_mutex,
1750							  OPEN_STATEID_MUTEX);
1751
1752					spin_lock(&clp->cl_lock);
1753					if (stid->sc_status == 0) {
1754						stid->sc_status |=
1755							SC_STATUS_ADMIN_REVOKED;
1756						atomic_inc(&clp->cl_admin_revoked);
1757						spin_unlock(&clp->cl_lock);
1758						release_all_access(stp);
1759					} else
1760						spin_unlock(&clp->cl_lock);
1761					mutex_unlock(&stp->st_mutex);
1762					break;
1763				case SC_TYPE_LOCK:
1764					stp = openlockstateid(stid);
1765					mutex_lock_nested(&stp->st_mutex,
1766							  LOCK_STATEID_MUTEX);
1767					spin_lock(&clp->cl_lock);
1768					if (stid->sc_status == 0) {
1769						struct nfs4_lockowner *lo =
1770							lockowner(stp->st_stateowner);
1771						struct nfsd_file *nf;
1772
1773						stid->sc_status |=
1774							SC_STATUS_ADMIN_REVOKED;
1775						atomic_inc(&clp->cl_admin_revoked);
1776						spin_unlock(&clp->cl_lock);
1777						nf = find_any_file(stp->st_stid.sc_file);
1778						if (nf) {
1779							get_file(nf->nf_file);
1780							filp_close(nf->nf_file,
1781								   (fl_owner_t)lo);
1782							nfsd_file_put(nf);
1783						}
1784						release_all_access(stp);
1785					} else
1786						spin_unlock(&clp->cl_lock);
1787					mutex_unlock(&stp->st_mutex);
1788					break;
1789				case SC_TYPE_DELEG:
1790					dp = delegstateid(stid);
1791					spin_lock(&state_lock);
1792					if (!unhash_delegation_locked(
1793						    dp, SC_STATUS_ADMIN_REVOKED))
1794						dp = NULL;
1795					spin_unlock(&state_lock);
1796					if (dp)
1797						revoke_delegation(dp);
1798					break;
1799				case SC_TYPE_LAYOUT:
1800					ls = layoutstateid(stid);
1801					nfsd4_close_layout(ls);
1802					break;
1803				}
1804				nfs4_put_stid(stid);
1805				spin_lock(&nn->client_lock);
1806				if (clp->cl_minorversion == 0)
1807					/* Allow cleanup after a lease period.
1808					 * store_release ensures cleanup will
1809					 * see any newly revoked states if it
1810					 * sees the time updated.
1811					 */
1812					nn->nfs40_last_revoke =
1813						ktime_get_boottime_seconds();
1814				goto retry;
1815			}
1816		}
1817	}
1818	spin_unlock(&nn->client_lock);
1819}
1820
1821static inline int
1822hash_sessionid(struct nfs4_sessionid *sessionid)
1823{
1824	struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1825
1826	return sid->sequence % SESSION_HASH_SIZE;
1827}
1828
1829#ifdef CONFIG_SUNRPC_DEBUG
1830static inline void
1831dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1832{
1833	u32 *ptr = (u32 *)(&sessionid->data[0]);
1834	dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1835}
1836#else
1837static inline void
1838dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1839{
1840}
1841#endif
1842
1843/*
1844 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1845 * won't be used for replay.
1846 */
1847void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1848{
1849	struct nfs4_stateowner *so = cstate->replay_owner;
1850
1851	if (nfserr == nfserr_replay_me)
1852		return;
1853
1854	if (!seqid_mutating_err(ntohl(nfserr))) {
1855		nfsd4_cstate_clear_replay(cstate);
1856		return;
1857	}
1858	if (!so)
1859		return;
1860	if (so->so_is_open_owner)
1861		release_last_closed_stateid(openowner(so));
1862	so->so_seqid++;
1863	return;
1864}
1865
1866static void
1867gen_sessionid(struct nfsd4_session *ses)
1868{
1869	struct nfs4_client *clp = ses->se_client;
1870	struct nfsd4_sessionid *sid;
1871
1872	sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1873	sid->clientid = clp->cl_clientid;
1874	sid->sequence = current_sessionid++;
1875	sid->reserved = 0;
1876}
1877
1878/*
1879 * The protocol defines ca_maxresponssize_cached to include the size of
1880 * the rpc header, but all we need to cache is the data starting after
1881 * the end of the initial SEQUENCE operation--the rest we regenerate
1882 * each time.  Therefore we can advertise a ca_maxresponssize_cached
1883 * value that is the number of bytes in our cache plus a few additional
1884 * bytes.  In order to stay on the safe side, and not promise more than
1885 * we can cache, those additional bytes must be the minimum possible: 24
1886 * bytes of rpc header (xid through accept state, with AUTH_NULL
1887 * verifier), 12 for the compound header (with zero-length tag), and 44
1888 * for the SEQUENCE op response:
1889 */
1890#define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
1891
1892static void
1893free_session_slots(struct nfsd4_session *ses)
1894{
1895	int i;
1896
1897	for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1898		free_svc_cred(&ses->se_slots[i]->sl_cred);
1899		kfree(ses->se_slots[i]);
1900	}
1901}
1902
1903/*
1904 * We don't actually need to cache the rpc and session headers, so we
1905 * can allocate a little less for each slot:
1906 */
1907static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1908{
1909	u32 size;
1910
1911	if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1912		size = 0;
1913	else
1914		size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1915	return size + sizeof(struct nfsd4_slot);
1916}
1917
1918/*
1919 * XXX: If we run out of reserved DRC memory we could (up to a point)
1920 * re-negotiate active sessions and reduce their slot usage to make
1921 * room for new connections. For now we just fail the create session.
1922 */
1923static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1924{
1925	u32 slotsize = slot_bytes(ca);
1926	u32 num = ca->maxreqs;
1927	unsigned long avail, total_avail;
1928	unsigned int scale_factor;
1929
1930	spin_lock(&nfsd_drc_lock);
1931	if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1932		total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1933	else
1934		/* We have handed out more space than we chose in
1935		 * set_max_drc() to allow.  That isn't really a
1936		 * problem as long as that doesn't make us think we
1937		 * have lots more due to integer overflow.
1938		 */
1939		total_avail = 0;
1940	avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1941	/*
1942	 * Never use more than a fraction of the remaining memory,
1943	 * unless it's the only way to give this client a slot.
1944	 * The chosen fraction is either 1/8 or 1/number of threads,
1945	 * whichever is smaller.  This ensures there are adequate
1946	 * slots to support multiple clients per thread.
1947	 * Give the client one slot even if that would require
1948	 * over-allocation--it is better than failure.
1949	 */
1950	scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1951
1952	avail = clamp_t(unsigned long, avail, slotsize,
1953			total_avail/scale_factor);
1954	num = min_t(int, num, avail / slotsize);
1955	num = max_t(int, num, 1);
1956	nfsd_drc_mem_used += num * slotsize;
1957	spin_unlock(&nfsd_drc_lock);
1958
1959	return num;
1960}
1961
1962static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1963{
1964	int slotsize = slot_bytes(ca);
1965
1966	spin_lock(&nfsd_drc_lock);
1967	nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1968	spin_unlock(&nfsd_drc_lock);
1969}
1970
1971static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1972					   struct nfsd4_channel_attrs *battrs)
1973{
1974	int numslots = fattrs->maxreqs;
1975	int slotsize = slot_bytes(fattrs);
1976	struct nfsd4_session *new;
1977	int i;
1978
1979	BUILD_BUG_ON(struct_size(new, se_slots, NFSD_MAX_SLOTS_PER_SESSION)
1980		     > PAGE_SIZE);
 
1981
1982	new = kzalloc(struct_size(new, se_slots, numslots), GFP_KERNEL);
1983	if (!new)
1984		return NULL;
1985	/* allocate each struct nfsd4_slot and data cache in one piece */
1986	for (i = 0; i < numslots; i++) {
1987		new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1988		if (!new->se_slots[i])
1989			goto out_free;
1990	}
1991
1992	memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1993	memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1994
1995	return new;
1996out_free:
1997	while (i--)
1998		kfree(new->se_slots[i]);
1999	kfree(new);
2000	return NULL;
2001}
2002
2003static void free_conn(struct nfsd4_conn *c)
2004{
2005	svc_xprt_put(c->cn_xprt);
2006	kfree(c);
2007}
2008
2009static void nfsd4_conn_lost(struct svc_xpt_user *u)
2010{
2011	struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
2012	struct nfs4_client *clp = c->cn_session->se_client;
2013
2014	trace_nfsd_cb_lost(clp);
2015
2016	spin_lock(&clp->cl_lock);
2017	if (!list_empty(&c->cn_persession)) {
2018		list_del(&c->cn_persession);
2019		free_conn(c);
2020	}
2021	nfsd4_probe_callback(clp);
2022	spin_unlock(&clp->cl_lock);
2023}
2024
2025static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
2026{
2027	struct nfsd4_conn *conn;
2028
2029	conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
2030	if (!conn)
2031		return NULL;
2032	svc_xprt_get(rqstp->rq_xprt);
2033	conn->cn_xprt = rqstp->rq_xprt;
2034	conn->cn_flags = flags;
2035	INIT_LIST_HEAD(&conn->cn_xpt_user.list);
2036	return conn;
2037}
2038
2039static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
2040{
2041	conn->cn_session = ses;
2042	list_add(&conn->cn_persession, &ses->se_conns);
2043}
2044
2045static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
2046{
2047	struct nfs4_client *clp = ses->se_client;
2048
2049	spin_lock(&clp->cl_lock);
2050	__nfsd4_hash_conn(conn, ses);
2051	spin_unlock(&clp->cl_lock);
2052}
2053
2054static int nfsd4_register_conn(struct nfsd4_conn *conn)
2055{
2056	conn->cn_xpt_user.callback = nfsd4_conn_lost;
2057	return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
2058}
2059
2060static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
2061{
2062	int ret;
2063
2064	nfsd4_hash_conn(conn, ses);
2065	ret = nfsd4_register_conn(conn);
2066	if (ret)
2067		/* oops; xprt is already down: */
2068		nfsd4_conn_lost(&conn->cn_xpt_user);
2069	/* We may have gained or lost a callback channel: */
2070	nfsd4_probe_callback_sync(ses->se_client);
2071}
2072
2073static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
2074{
2075	u32 dir = NFS4_CDFC4_FORE;
2076
2077	if (cses->flags & SESSION4_BACK_CHAN)
2078		dir |= NFS4_CDFC4_BACK;
2079	return alloc_conn(rqstp, dir);
2080}
2081
2082/* must be called under client_lock */
2083static void nfsd4_del_conns(struct nfsd4_session *s)
2084{
2085	struct nfs4_client *clp = s->se_client;
2086	struct nfsd4_conn *c;
2087
2088	spin_lock(&clp->cl_lock);
2089	while (!list_empty(&s->se_conns)) {
2090		c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
2091		list_del_init(&c->cn_persession);
2092		spin_unlock(&clp->cl_lock);
2093
2094		unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
2095		free_conn(c);
2096
2097		spin_lock(&clp->cl_lock);
2098	}
2099	spin_unlock(&clp->cl_lock);
2100}
2101
2102static void __free_session(struct nfsd4_session *ses)
2103{
2104	free_session_slots(ses);
2105	kfree(ses);
2106}
2107
2108static void free_session(struct nfsd4_session *ses)
2109{
2110	nfsd4_del_conns(ses);
2111	nfsd4_put_drc_mem(&ses->se_fchannel);
2112	__free_session(ses);
2113}
2114
2115static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
2116{
2117	int idx;
2118	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2119
2120	new->se_client = clp;
2121	gen_sessionid(new);
2122
2123	INIT_LIST_HEAD(&new->se_conns);
2124
2125	new->se_cb_seq_nr = 1;
2126	new->se_flags = cses->flags;
2127	new->se_cb_prog = cses->callback_prog;
2128	new->se_cb_sec = cses->cb_sec;
2129	atomic_set(&new->se_ref, 0);
2130	idx = hash_sessionid(&new->se_sessionid);
2131	list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
2132	spin_lock(&clp->cl_lock);
2133	list_add(&new->se_perclnt, &clp->cl_sessions);
2134	spin_unlock(&clp->cl_lock);
2135
2136	{
2137		struct sockaddr *sa = svc_addr(rqstp);
2138		/*
2139		 * This is a little silly; with sessions there's no real
2140		 * use for the callback address.  Use the peer address
2141		 * as a reasonable default for now, but consider fixing
2142		 * the rpc client not to require an address in the
2143		 * future:
2144		 */
2145		rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
2146		clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
2147	}
2148}
2149
2150/* caller must hold client_lock */
2151static struct nfsd4_session *
2152__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
2153{
2154	struct nfsd4_session *elem;
2155	int idx;
2156	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2157
2158	lockdep_assert_held(&nn->client_lock);
2159
2160	dump_sessionid(__func__, sessionid);
2161	idx = hash_sessionid(sessionid);
2162	/* Search in the appropriate list */
2163	list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
2164		if (!memcmp(elem->se_sessionid.data, sessionid->data,
2165			    NFS4_MAX_SESSIONID_LEN)) {
2166			return elem;
2167		}
2168	}
2169
2170	dprintk("%s: session not found\n", __func__);
2171	return NULL;
2172}
2173
2174static struct nfsd4_session *
2175find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
2176		__be32 *ret)
2177{
2178	struct nfsd4_session *session;
2179	__be32 status = nfserr_badsession;
2180
2181	session = __find_in_sessionid_hashtbl(sessionid, net);
2182	if (!session)
2183		goto out;
2184	status = nfsd4_get_session_locked(session);
2185	if (status)
2186		session = NULL;
2187out:
2188	*ret = status;
2189	return session;
2190}
2191
2192/* caller must hold client_lock */
2193static void
2194unhash_session(struct nfsd4_session *ses)
2195{
2196	struct nfs4_client *clp = ses->se_client;
2197	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2198
2199	lockdep_assert_held(&nn->client_lock);
2200
2201	list_del(&ses->se_hash);
2202	spin_lock(&ses->se_client->cl_lock);
2203	list_del(&ses->se_perclnt);
2204	spin_unlock(&ses->se_client->cl_lock);
2205}
2206
2207/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
2208static int
2209STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
2210{
2211	/*
2212	 * We're assuming the clid was not given out from a boot
2213	 * precisely 2^32 (about 136 years) before this one.  That seems
2214	 * a safe assumption:
2215	 */
2216	if (clid->cl_boot == (u32)nn->boot_time)
2217		return 0;
2218	trace_nfsd_clid_stale(clid);
 
2219	return 1;
2220}
2221
2222/* 
2223 * XXX Should we use a slab cache ?
2224 * This type of memory management is somewhat inefficient, but we use it
2225 * anyway since SETCLIENTID is not a common operation.
2226 */
2227static struct nfs4_client *alloc_client(struct xdr_netobj name,
2228				struct nfsd_net *nn)
2229{
2230	struct nfs4_client *clp;
2231	int i;
2232
2233	if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) {
2234		mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
2235		return NULL;
2236	}
2237	clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
2238	if (clp == NULL)
2239		return NULL;
2240	xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
2241	if (clp->cl_name.data == NULL)
2242		goto err_no_name;
2243	clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
2244						 sizeof(struct list_head),
2245						 GFP_KERNEL);
2246	if (!clp->cl_ownerstr_hashtbl)
2247		goto err_no_hashtbl;
2248	for (i = 0; i < OWNER_HASH_SIZE; i++)
2249		INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
 
2250	INIT_LIST_HEAD(&clp->cl_sessions);
2251	idr_init(&clp->cl_stateids);
2252	atomic_set(&clp->cl_rpc_users, 0);
2253	clp->cl_cb_state = NFSD4_CB_UNKNOWN;
2254	clp->cl_state = NFSD4_ACTIVE;
2255	atomic_inc(&nn->nfs4_client_count);
2256	atomic_set(&clp->cl_delegs_in_recall, 0);
2257	INIT_LIST_HEAD(&clp->cl_idhash);
2258	INIT_LIST_HEAD(&clp->cl_openowners);
2259	INIT_LIST_HEAD(&clp->cl_delegations);
2260	INIT_LIST_HEAD(&clp->cl_lru);
2261	INIT_LIST_HEAD(&clp->cl_revoked);
2262#ifdef CONFIG_NFSD_PNFS
2263	INIT_LIST_HEAD(&clp->cl_lo_states);
2264#endif
2265	INIT_LIST_HEAD(&clp->async_copies);
2266	spin_lock_init(&clp->async_lock);
2267	spin_lock_init(&clp->cl_lock);
2268	rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
2269	return clp;
2270err_no_hashtbl:
2271	kfree(clp->cl_name.data);
2272err_no_name:
2273	kmem_cache_free(client_slab, clp);
2274	return NULL;
2275}
2276
2277static void __free_client(struct kref *k)
2278{
2279	struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2280	struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2281
2282	free_svc_cred(&clp->cl_cred);
2283	kfree(clp->cl_ownerstr_hashtbl);
2284	kfree(clp->cl_name.data);
2285	kfree(clp->cl_nii_domain.data);
2286	kfree(clp->cl_nii_name.data);
2287	idr_destroy(&clp->cl_stateids);
2288	kfree(clp->cl_ra);
2289	kmem_cache_free(client_slab, clp);
2290}
2291
2292static void drop_client(struct nfs4_client *clp)
2293{
2294	kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
2295}
2296
2297static void
2298free_client(struct nfs4_client *clp)
2299{
2300	while (!list_empty(&clp->cl_sessions)) {
2301		struct nfsd4_session *ses;
2302		ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2303				se_perclnt);
2304		list_del(&ses->se_perclnt);
2305		WARN_ON_ONCE(atomic_read(&ses->se_ref));
2306		free_session(ses);
2307	}
2308	rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2309	if (clp->cl_nfsd_dentry) {
2310		nfsd_client_rmdir(clp->cl_nfsd_dentry);
2311		clp->cl_nfsd_dentry = NULL;
2312		wake_up_all(&expiry_wq);
2313	}
2314	drop_client(clp);
2315}
2316
2317/* must be called under the client_lock */
2318static void
2319unhash_client_locked(struct nfs4_client *clp)
2320{
2321	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2322	struct nfsd4_session *ses;
2323
2324	lockdep_assert_held(&nn->client_lock);
2325
2326	/* Mark the client as expired! */
2327	clp->cl_time = 0;
2328	/* Make it invisible */
2329	if (!list_empty(&clp->cl_idhash)) {
2330		list_del_init(&clp->cl_idhash);
2331		if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2332			rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2333		else
2334			rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2335	}
2336	list_del_init(&clp->cl_lru);
2337	spin_lock(&clp->cl_lock);
2338	list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2339		list_del_init(&ses->se_hash);
2340	spin_unlock(&clp->cl_lock);
2341}
2342
2343static void
2344unhash_client(struct nfs4_client *clp)
2345{
2346	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2347
2348	spin_lock(&nn->client_lock);
2349	unhash_client_locked(clp);
2350	spin_unlock(&nn->client_lock);
2351}
2352
2353static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2354{
2355	if (atomic_read(&clp->cl_rpc_users))
2356		return nfserr_jukebox;
2357	unhash_client_locked(clp);
2358	return nfs_ok;
2359}
2360
2361static void
2362__destroy_client(struct nfs4_client *clp)
2363{
2364	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2365	int i;
2366	struct nfs4_openowner *oo;
2367	struct nfs4_delegation *dp;
2368	struct list_head reaplist;
2369
2370	INIT_LIST_HEAD(&reaplist);
2371	spin_lock(&state_lock);
2372	while (!list_empty(&clp->cl_delegations)) {
2373		dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2374		unhash_delegation_locked(dp, SC_STATUS_CLOSED);
2375		list_add(&dp->dl_recall_lru, &reaplist);
2376	}
2377	spin_unlock(&state_lock);
2378	while (!list_empty(&reaplist)) {
2379		dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2380		list_del_init(&dp->dl_recall_lru);
2381		destroy_unhashed_deleg(dp);
2382	}
2383	while (!list_empty(&clp->cl_revoked)) {
2384		dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2385		list_del_init(&dp->dl_recall_lru);
2386		nfs4_put_stid(&dp->dl_stid);
2387	}
2388	while (!list_empty(&clp->cl_openowners)) {
2389		oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2390		nfs4_get_stateowner(&oo->oo_owner);
2391		release_openowner(oo);
2392	}
2393	for (i = 0; i < OWNER_HASH_SIZE; i++) {
2394		struct nfs4_stateowner *so, *tmp;
2395
2396		list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2397					 so_strhash) {
2398			/* Should be no openowners at this point */
2399			WARN_ON_ONCE(so->so_is_open_owner);
2400			remove_blocked_locks(lockowner(so));
2401		}
2402	}
2403	nfsd4_return_all_client_layouts(clp);
2404	nfsd4_shutdown_copy(clp);
2405	nfsd4_shutdown_callback(clp);
2406	if (clp->cl_cb_conn.cb_xprt)
2407		svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2408	atomic_add_unless(&nn->nfs4_client_count, -1, 0);
2409	nfsd4_dec_courtesy_client_count(nn, clp);
2410	free_client(clp);
2411	wake_up_all(&expiry_wq);
2412}
2413
2414static void
2415destroy_client(struct nfs4_client *clp)
2416{
2417	unhash_client(clp);
2418	__destroy_client(clp);
2419}
2420
2421static void inc_reclaim_complete(struct nfs4_client *clp)
2422{
2423	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2424
2425	if (!nn->track_reclaim_completes)
2426		return;
2427	if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2428		return;
2429	if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2430			nn->reclaim_str_hashtbl_size) {
2431		printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2432				clp->net->ns.inum);
2433		nfsd4_end_grace(nn);
2434	}
2435}
2436
2437static void expire_client(struct nfs4_client *clp)
2438{
2439	unhash_client(clp);
2440	nfsd4_client_record_remove(clp);
2441	__destroy_client(clp);
2442}
2443
2444static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2445{
2446	memcpy(target->cl_verifier.data, source->data,
2447			sizeof(target->cl_verifier.data));
2448}
2449
2450static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2451{
2452	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
2453	target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
2454}
2455
2456static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2457{
2458	target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2459	target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2460								GFP_KERNEL);
2461	target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2462	if ((source->cr_principal && !target->cr_principal) ||
2463	    (source->cr_raw_principal && !target->cr_raw_principal) ||
2464	    (source->cr_targ_princ && !target->cr_targ_princ))
2465		return -ENOMEM;
2466
2467	target->cr_flavor = source->cr_flavor;
2468	target->cr_uid = source->cr_uid;
2469	target->cr_gid = source->cr_gid;
2470	target->cr_group_info = source->cr_group_info;
2471	get_group_info(target->cr_group_info);
2472	target->cr_gss_mech = source->cr_gss_mech;
2473	if (source->cr_gss_mech)
2474		gss_mech_get(source->cr_gss_mech);
2475	return 0;
2476}
2477
2478static int
2479compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2480{
2481	if (o1->len < o2->len)
2482		return -1;
2483	if (o1->len > o2->len)
2484		return 1;
2485	return memcmp(o1->data, o2->data, o1->len);
2486}
2487
 
 
 
 
 
2488static int
2489same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2490{
2491	return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2492}
2493
2494static int
2495same_clid(clientid_t *cl1, clientid_t *cl2)
2496{
2497	return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2498}
2499
2500static bool groups_equal(struct group_info *g1, struct group_info *g2)
2501{
2502	int i;
2503
2504	if (g1->ngroups != g2->ngroups)
2505		return false;
2506	for (i=0; i<g1->ngroups; i++)
2507		if (!gid_eq(g1->gid[i], g2->gid[i]))
2508			return false;
2509	return true;
2510}
2511
2512/*
2513 * RFC 3530 language requires clid_inuse be returned when the
2514 * "principal" associated with a requests differs from that previously
2515 * used.  We use uid, gid's, and gss principal string as our best
2516 * approximation.  We also don't want to allow non-gss use of a client
2517 * established using gss: in theory cr_principal should catch that
2518 * change, but in practice cr_principal can be null even in the gss case
2519 * since gssd doesn't always pass down a principal string.
2520 */
2521static bool is_gss_cred(struct svc_cred *cr)
2522{
2523	/* Is cr_flavor one of the gss "pseudoflavors"?: */
2524	return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2525}
2526
2527
2528static bool
2529same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2530{
2531	if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2532		|| (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2533		|| (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2534		|| !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2535		return false;
2536	/* XXX: check that cr_targ_princ fields match ? */
2537	if (cr1->cr_principal == cr2->cr_principal)
2538		return true;
2539	if (!cr1->cr_principal || !cr2->cr_principal)
2540		return false;
2541	return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2542}
2543
2544static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2545{
2546	struct svc_cred *cr = &rqstp->rq_cred;
2547	u32 service;
2548
2549	if (!cr->cr_gss_mech)
2550		return false;
2551	service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2552	return service == RPC_GSS_SVC_INTEGRITY ||
2553	       service == RPC_GSS_SVC_PRIVACY;
2554}
2555
2556bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2557{
2558	struct svc_cred *cr = &rqstp->rq_cred;
2559
2560	if (!cl->cl_mach_cred)
2561		return true;
2562	if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2563		return false;
2564	if (!svc_rqst_integrity_protected(rqstp))
2565		return false;
2566	if (cl->cl_cred.cr_raw_principal)
2567		return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2568						cr->cr_raw_principal);
2569	if (!cr->cr_principal)
2570		return false;
2571	return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2572}
2573
2574static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2575{
2576	__be32 verf[2];
2577
2578	/*
2579	 * This is opaque to client, so no need to byte-swap. Use
2580	 * __force to keep sparse happy
2581	 */
2582	verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2583	verf[1] = (__force __be32)nn->clverifier_counter++;
2584	memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2585}
2586
2587static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2588{
2589	clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2590	clp->cl_clientid.cl_id = nn->clientid_counter++;
2591	gen_confirm(clp, nn);
2592}
2593
2594static struct nfs4_stid *
2595find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2596{
2597	struct nfs4_stid *ret;
2598
2599	ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2600	if (!ret || !ret->sc_type)
2601		return NULL;
2602	return ret;
2603}
2604
2605static struct nfs4_stid *
2606find_stateid_by_type(struct nfs4_client *cl, stateid_t *t,
2607		     unsigned short typemask, unsigned short ok_states)
2608{
2609	struct nfs4_stid *s;
2610
2611	spin_lock(&cl->cl_lock);
2612	s = find_stateid_locked(cl, t);
2613	if (s != NULL) {
2614		if ((s->sc_status & ~ok_states) == 0 &&
2615		    (typemask & s->sc_type))
2616			refcount_inc(&s->sc_count);
2617		else
2618			s = NULL;
2619	}
2620	spin_unlock(&cl->cl_lock);
2621	return s;
2622}
2623
2624static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2625{
2626	struct nfsdfs_client *nc;
2627	nc = get_nfsdfs_client(inode);
2628	if (!nc)
2629		return NULL;
2630	return container_of(nc, struct nfs4_client, cl_nfsdfs);
2631}
2632
2633static void seq_quote_mem(struct seq_file *m, char *data, int len)
2634{
2635	seq_puts(m, "\"");
2636	seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
2637	seq_puts(m, "\"");
2638}
2639
2640static const char *cb_state2str(int state)
2641{
2642	switch (state) {
2643	case NFSD4_CB_UP:
2644		return "UP";
2645	case NFSD4_CB_UNKNOWN:
2646		return "UNKNOWN";
2647	case NFSD4_CB_DOWN:
2648		return "DOWN";
2649	case NFSD4_CB_FAULT:
2650		return "FAULT";
2651	}
2652	return "UNDEFINED";
2653}
2654
2655static int client_info_show(struct seq_file *m, void *v)
2656{
2657	struct inode *inode = file_inode(m->file);
2658	struct nfs4_client *clp;
2659	u64 clid;
2660
2661	clp = get_nfsdfs_clp(inode);
2662	if (!clp)
2663		return -ENXIO;
2664	memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2665	seq_printf(m, "clientid: 0x%llx\n", clid);
2666	seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2667
2668	if (clp->cl_state == NFSD4_COURTESY)
2669		seq_puts(m, "status: courtesy\n");
2670	else if (clp->cl_state == NFSD4_EXPIRABLE)
2671		seq_puts(m, "status: expirable\n");
2672	else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2673		seq_puts(m, "status: confirmed\n");
2674	else
2675		seq_puts(m, "status: unconfirmed\n");
2676	seq_printf(m, "seconds from last renew: %lld\n",
2677		ktime_get_boottime_seconds() - clp->cl_time);
2678	seq_puts(m, "name: ");
2679	seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2680	seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2681	if (clp->cl_nii_domain.data) {
2682		seq_puts(m, "Implementation domain: ");
2683		seq_quote_mem(m, clp->cl_nii_domain.data,
2684					clp->cl_nii_domain.len);
2685		seq_puts(m, "\nImplementation name: ");
2686		seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2687		seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2688			clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2689	}
2690	seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
2691	seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
2692	seq_printf(m, "admin-revoked states: %d\n",
2693		   atomic_read(&clp->cl_admin_revoked));
2694	drop_client(clp);
2695
2696	return 0;
2697}
2698
2699DEFINE_SHOW_ATTRIBUTE(client_info);
2700
2701static void *states_start(struct seq_file *s, loff_t *pos)
2702	__acquires(&clp->cl_lock)
2703{
2704	struct nfs4_client *clp = s->private;
2705	unsigned long id = *pos;
2706	void *ret;
2707
2708	spin_lock(&clp->cl_lock);
2709	ret = idr_get_next_ul(&clp->cl_stateids, &id);
2710	*pos = id;
2711	return ret;
2712}
2713
2714static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2715{
2716	struct nfs4_client *clp = s->private;
2717	unsigned long id = *pos;
2718	void *ret;
2719
2720	id = *pos;
2721	id++;
2722	ret = idr_get_next_ul(&clp->cl_stateids, &id);
2723	*pos = id;
2724	return ret;
2725}
2726
2727static void states_stop(struct seq_file *s, void *v)
2728	__releases(&clp->cl_lock)
2729{
2730	struct nfs4_client *clp = s->private;
2731
2732	spin_unlock(&clp->cl_lock);
2733}
2734
2735static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2736{
2737         seq_printf(s, "filename: \"%pD2\"", f->nf_file);
2738}
2739
2740static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2741{
2742	struct inode *inode = file_inode(f->nf_file);
2743
2744	seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2745					MAJOR(inode->i_sb->s_dev),
2746					 MINOR(inode->i_sb->s_dev),
2747					 inode->i_ino);
2748}
2749
2750static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2751{
2752	seq_puts(s, "owner: ");
2753	seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2754}
2755
2756static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2757{
2758	seq_printf(s, "0x%.8x", stid->si_generation);
2759	seq_printf(s, "%12phN", &stid->si_opaque);
2760}
2761
2762static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2763{
2764	struct nfs4_ol_stateid *ols;
2765	struct nfs4_file *nf;
2766	struct nfsd_file *file;
2767	struct nfs4_stateowner *oo;
2768	unsigned int access, deny;
2769
2770	ols = openlockstateid(st);
2771	oo = ols->st_stateowner;
2772	nf = st->sc_file;
2773
2774	seq_puts(s, "- ");
2775	nfs4_show_stateid(s, &st->sc_stateid);
2776	seq_puts(s, ": { type: open, ");
2777
2778	access = bmap_to_share_mode(ols->st_access_bmap);
2779	deny   = bmap_to_share_mode(ols->st_deny_bmap);
2780
2781	seq_printf(s, "access: %s%s, ",
2782		access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2783		access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2784	seq_printf(s, "deny: %s%s, ",
2785		deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2786		deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2787
2788	spin_lock(&nf->fi_lock);
2789	file = find_any_file_locked(nf);
2790	if (file) {
2791		nfs4_show_superblock(s, file);
2792		seq_puts(s, ", ");
2793		nfs4_show_fname(s, file);
2794		seq_puts(s, ", ");
2795	}
2796	spin_unlock(&nf->fi_lock);
2797	nfs4_show_owner(s, oo);
2798	if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2799		seq_puts(s, ", admin-revoked");
2800	seq_puts(s, " }\n");
2801	return 0;
2802}
2803
2804static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2805{
2806	struct nfs4_ol_stateid *ols;
2807	struct nfs4_file *nf;
2808	struct nfsd_file *file;
2809	struct nfs4_stateowner *oo;
2810
2811	ols = openlockstateid(st);
2812	oo = ols->st_stateowner;
2813	nf = st->sc_file;
2814
2815	seq_puts(s, "- ");
2816	nfs4_show_stateid(s, &st->sc_stateid);
2817	seq_puts(s, ": { type: lock, ");
2818
2819	spin_lock(&nf->fi_lock);
2820	file = find_any_file_locked(nf);
2821	if (file) {
2822		/*
2823		 * Note: a lock stateid isn't really the same thing as a lock,
2824		 * it's the locking state held by one owner on a file, and there
2825		 * may be multiple (or no) lock ranges associated with it.
2826		 * (Same for the matter is true of open stateids.)
2827		 */
2828
2829		nfs4_show_superblock(s, file);
2830		/* XXX: open stateid? */
2831		seq_puts(s, ", ");
2832		nfs4_show_fname(s, file);
2833		seq_puts(s, ", ");
2834	}
2835	nfs4_show_owner(s, oo);
2836	if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2837		seq_puts(s, ", admin-revoked");
2838	seq_puts(s, " }\n");
2839	spin_unlock(&nf->fi_lock);
2840	return 0;
2841}
2842
2843static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2844{
2845	struct nfs4_delegation *ds;
2846	struct nfs4_file *nf;
2847	struct nfsd_file *file;
2848
2849	ds = delegstateid(st);
2850	nf = st->sc_file;
2851
2852	seq_puts(s, "- ");
2853	nfs4_show_stateid(s, &st->sc_stateid);
2854	seq_puts(s, ": { type: deleg, ");
2855
2856	seq_printf(s, "access: %s",
2857		   ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2858
2859	/* XXX: lease time, whether it's being recalled. */
2860
2861	spin_lock(&nf->fi_lock);
2862	file = nf->fi_deleg_file;
2863	if (file) {
2864		seq_puts(s, ", ");
2865		nfs4_show_superblock(s, file);
2866		seq_puts(s, ", ");
2867		nfs4_show_fname(s, file);
2868	}
2869	spin_unlock(&nf->fi_lock);
2870	if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2871		seq_puts(s, ", admin-revoked");
2872	seq_puts(s, " }\n");
2873	return 0;
2874}
2875
2876static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2877{
2878	struct nfs4_layout_stateid *ls;
2879	struct nfsd_file *file;
2880
2881	ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2882
2883	seq_puts(s, "- ");
2884	nfs4_show_stateid(s, &st->sc_stateid);
2885	seq_puts(s, ": { type: layout");
2886
2887	/* XXX: What else would be useful? */
2888
2889	spin_lock(&ls->ls_stid.sc_file->fi_lock);
2890	file = ls->ls_file;
2891	if (file) {
2892		seq_puts(s, ", ");
2893		nfs4_show_superblock(s, file);
2894		seq_puts(s, ", ");
2895		nfs4_show_fname(s, file);
2896	}
2897	spin_unlock(&ls->ls_stid.sc_file->fi_lock);
2898	if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2899		seq_puts(s, ", admin-revoked");
2900	seq_puts(s, " }\n");
2901
2902	return 0;
2903}
2904
2905static int states_show(struct seq_file *s, void *v)
2906{
2907	struct nfs4_stid *st = v;
2908
2909	switch (st->sc_type) {
2910	case SC_TYPE_OPEN:
2911		return nfs4_show_open(s, st);
2912	case SC_TYPE_LOCK:
2913		return nfs4_show_lock(s, st);
2914	case SC_TYPE_DELEG:
2915		return nfs4_show_deleg(s, st);
2916	case SC_TYPE_LAYOUT:
2917		return nfs4_show_layout(s, st);
2918	default:
2919		return 0; /* XXX: or SEQ_SKIP? */
2920	}
2921	/* XXX: copy stateids? */
2922}
2923
2924static struct seq_operations states_seq_ops = {
2925	.start = states_start,
2926	.next = states_next,
2927	.stop = states_stop,
2928	.show = states_show
2929};
2930
2931static int client_states_open(struct inode *inode, struct file *file)
2932{
2933	struct seq_file *s;
2934	struct nfs4_client *clp;
2935	int ret;
2936
2937	clp = get_nfsdfs_clp(inode);
2938	if (!clp)
2939		return -ENXIO;
2940
2941	ret = seq_open(file, &states_seq_ops);
2942	if (ret)
2943		return ret;
2944	s = file->private_data;
2945	s->private = clp;
2946	return 0;
2947}
2948
2949static int client_opens_release(struct inode *inode, struct file *file)
2950{
2951	struct seq_file *m = file->private_data;
2952	struct nfs4_client *clp = m->private;
2953
2954	/* XXX: alternatively, we could get/drop in seq start/stop */
2955	drop_client(clp);
2956	return seq_release(inode, file);
2957}
2958
2959static const struct file_operations client_states_fops = {
2960	.open		= client_states_open,
2961	.read		= seq_read,
2962	.llseek		= seq_lseek,
2963	.release	= client_opens_release,
2964};
2965
2966/*
2967 * Normally we refuse to destroy clients that are in use, but here the
2968 * administrator is telling us to just do it.  We also want to wait
2969 * so the caller has a guarantee that the client's locks are gone by
2970 * the time the write returns:
2971 */
2972static void force_expire_client(struct nfs4_client *clp)
2973{
2974	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2975	bool already_expired;
2976
2977	trace_nfsd_clid_admin_expired(&clp->cl_clientid);
2978
2979	spin_lock(&nn->client_lock);
2980	clp->cl_time = 0;
2981	spin_unlock(&nn->client_lock);
2982
2983	wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2984	spin_lock(&nn->client_lock);
2985	already_expired = list_empty(&clp->cl_lru);
2986	if (!already_expired)
2987		unhash_client_locked(clp);
2988	spin_unlock(&nn->client_lock);
2989
2990	if (!already_expired)
2991		expire_client(clp);
2992	else
2993		wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2994}
2995
2996static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2997				   size_t size, loff_t *pos)
2998{
2999	char *data;
3000	struct nfs4_client *clp;
3001
3002	data = simple_transaction_get(file, buf, size);
3003	if (IS_ERR(data))
3004		return PTR_ERR(data);
3005	if (size != 7 || 0 != memcmp(data, "expire\n", 7))
3006		return -EINVAL;
3007	clp = get_nfsdfs_clp(file_inode(file));
3008	if (!clp)
3009		return -ENXIO;
3010	force_expire_client(clp);
3011	drop_client(clp);
3012	return 7;
3013}
3014
3015static const struct file_operations client_ctl_fops = {
3016	.write		= client_ctl_write,
3017	.release	= simple_transaction_release,
3018};
3019
3020static const struct tree_descr client_files[] = {
3021	[0] = {"info", &client_info_fops, S_IRUSR},
3022	[1] = {"states", &client_states_fops, S_IRUSR},
3023	[2] = {"ctl", &client_ctl_fops, S_IWUSR},
3024	[3] = {""},
3025};
3026
3027static int
3028nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
3029				struct rpc_task *task)
3030{
3031	trace_nfsd_cb_recall_any_done(cb, task);
3032	switch (task->tk_status) {
3033	case -NFS4ERR_DELAY:
3034		rpc_delay(task, 2 * HZ);
3035		return 0;
3036	default:
3037		return 1;
3038	}
3039}
3040
3041static void
3042nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
3043{
3044	struct nfs4_client *clp = cb->cb_clp;
3045
3046	clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
3047	drop_client(clp);
3048}
3049
3050static int
3051nfsd4_cb_getattr_done(struct nfsd4_callback *cb, struct rpc_task *task)
3052{
3053	struct nfs4_cb_fattr *ncf =
3054			container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
3055
3056	ncf->ncf_cb_status = task->tk_status;
3057	switch (task->tk_status) {
3058	case -NFS4ERR_DELAY:
3059		rpc_delay(task, 2 * HZ);
3060		return 0;
3061	default:
3062		return 1;
3063	}
3064}
3065
3066static void
3067nfsd4_cb_getattr_release(struct nfsd4_callback *cb)
3068{
3069	struct nfs4_cb_fattr *ncf =
3070			container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
3071	struct nfs4_delegation *dp =
3072			container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3073
3074	nfs4_put_stid(&dp->dl_stid);
3075	clear_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags);
3076	wake_up_bit(&ncf->ncf_cb_flags, CB_GETATTR_BUSY);
3077}
3078
3079static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
3080	.done		= nfsd4_cb_recall_any_done,
3081	.release	= nfsd4_cb_recall_any_release,
3082};
3083
3084static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops = {
3085	.done		= nfsd4_cb_getattr_done,
3086	.release	= nfsd4_cb_getattr_release,
3087};
3088
3089static void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf)
3090{
3091	struct nfs4_delegation *dp =
3092			container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3093
3094	if (test_and_set_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags))
3095		return;
3096	/* set to proper status when nfsd4_cb_getattr_done runs */
3097	ncf->ncf_cb_status = NFS4ERR_IO;
3098
3099	refcount_inc(&dp->dl_stid.sc_count);
3100	nfsd4_run_cb(&ncf->ncf_getattr);
3101}
3102
3103static struct nfs4_client *create_client(struct xdr_netobj name,
3104		struct svc_rqst *rqstp, nfs4_verifier *verf)
3105{
3106	struct nfs4_client *clp;
3107	struct sockaddr *sa = svc_addr(rqstp);
3108	int ret;
3109	struct net *net = SVC_NET(rqstp);
3110	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3111	struct dentry *dentries[ARRAY_SIZE(client_files)];
3112
3113	clp = alloc_client(name, nn);
3114	if (clp == NULL)
3115		return NULL;
3116
3117	ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
3118	if (ret) {
3119		free_client(clp);
3120		return NULL;
3121	}
3122	gen_clid(clp, nn);
3123	kref_init(&clp->cl_nfsdfs.cl_ref);
3124	nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
3125	clp->cl_time = ktime_get_boottime_seconds();
3126	clear_bit(0, &clp->cl_cb_slot_busy);
3127	copy_verf(clp, verf);
3128	memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
3129	clp->cl_cb_session = NULL;
3130	clp->net = net;
3131	clp->cl_nfsd_dentry = nfsd_client_mkdir(
3132		nn, &clp->cl_nfsdfs,
3133		clp->cl_clientid.cl_id - nn->clientid_base,
3134		client_files, dentries);
3135	clp->cl_nfsd_info_dentry = dentries[0];
3136	if (!clp->cl_nfsd_dentry) {
3137		free_client(clp);
3138		return NULL;
3139	}
3140	clp->cl_ra = kzalloc(sizeof(*clp->cl_ra), GFP_KERNEL);
3141	if (!clp->cl_ra) {
3142		free_client(clp);
3143		return NULL;
3144	}
3145	clp->cl_ra_time = 0;
3146	nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops,
3147			NFSPROC4_CLNT_CB_RECALL_ANY);
3148	return clp;
3149}
3150
3151static void
3152add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
3153{
3154	struct rb_node **new = &(root->rb_node), *parent = NULL;
3155	struct nfs4_client *clp;
3156
3157	while (*new) {
3158		clp = rb_entry(*new, struct nfs4_client, cl_namenode);
3159		parent = *new;
3160
3161		if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
3162			new = &((*new)->rb_left);
3163		else
3164			new = &((*new)->rb_right);
3165	}
3166
3167	rb_link_node(&new_clp->cl_namenode, parent, new);
3168	rb_insert_color(&new_clp->cl_namenode, root);
3169}
3170
3171static struct nfs4_client *
3172find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
3173{
3174	int cmp;
3175	struct rb_node *node = root->rb_node;
3176	struct nfs4_client *clp;
3177
3178	while (node) {
3179		clp = rb_entry(node, struct nfs4_client, cl_namenode);
3180		cmp = compare_blob(&clp->cl_name, name);
3181		if (cmp > 0)
3182			node = node->rb_left;
3183		else if (cmp < 0)
3184			node = node->rb_right;
3185		else
3186			return clp;
3187	}
3188	return NULL;
3189}
3190
3191static void
3192add_to_unconfirmed(struct nfs4_client *clp)
3193{
3194	unsigned int idhashval;
3195	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3196
3197	lockdep_assert_held(&nn->client_lock);
3198
3199	clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
3200	add_clp_to_name_tree(clp, &nn->unconf_name_tree);
3201	idhashval = clientid_hashval(clp->cl_clientid.cl_id);
3202	list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
3203	renew_client_locked(clp);
3204}
3205
3206static void
3207move_to_confirmed(struct nfs4_client *clp)
3208{
3209	unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
3210	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3211
3212	lockdep_assert_held(&nn->client_lock);
3213
 
3214	list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
3215	rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
3216	add_clp_to_name_tree(clp, &nn->conf_name_tree);
3217	set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
3218	trace_nfsd_clid_confirmed(&clp->cl_clientid);
3219	renew_client_locked(clp);
3220}
3221
3222static struct nfs4_client *
3223find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
3224{
3225	struct nfs4_client *clp;
3226	unsigned int idhashval = clientid_hashval(clid->cl_id);
3227
3228	list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
3229		if (same_clid(&clp->cl_clientid, clid)) {
3230			if ((bool)clp->cl_minorversion != sessions)
3231				return NULL;
3232			renew_client_locked(clp);
3233			return clp;
3234		}
3235	}
3236	return NULL;
3237}
3238
3239static struct nfs4_client *
3240find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3241{
3242	struct list_head *tbl = nn->conf_id_hashtbl;
3243
3244	lockdep_assert_held(&nn->client_lock);
3245	return find_client_in_id_table(tbl, clid, sessions);
3246}
3247
3248static struct nfs4_client *
3249find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3250{
3251	struct list_head *tbl = nn->unconf_id_hashtbl;
3252
3253	lockdep_assert_held(&nn->client_lock);
3254	return find_client_in_id_table(tbl, clid, sessions);
3255}
3256
3257static bool clp_used_exchangeid(struct nfs4_client *clp)
3258{
3259	return clp->cl_exchange_flags != 0;
3260} 
3261
3262static struct nfs4_client *
3263find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3264{
3265	lockdep_assert_held(&nn->client_lock);
3266	return find_clp_in_name_tree(name, &nn->conf_name_tree);
3267}
3268
3269static struct nfs4_client *
3270find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3271{
3272	lockdep_assert_held(&nn->client_lock);
3273	return find_clp_in_name_tree(name, &nn->unconf_name_tree);
3274}
3275
3276static void
3277gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
3278{
3279	struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
3280	struct sockaddr	*sa = svc_addr(rqstp);
3281	u32 scopeid = rpc_get_scope_id(sa);
3282	unsigned short expected_family;
3283
3284	/* Currently, we only support tcp and tcp6 for the callback channel */
3285	if (se->se_callback_netid_len == 3 &&
3286	    !memcmp(se->se_callback_netid_val, "tcp", 3))
3287		expected_family = AF_INET;
3288	else if (se->se_callback_netid_len == 4 &&
3289		 !memcmp(se->se_callback_netid_val, "tcp6", 4))
3290		expected_family = AF_INET6;
3291	else
3292		goto out_err;
3293
3294	conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
3295					    se->se_callback_addr_len,
3296					    (struct sockaddr *)&conn->cb_addr,
3297					    sizeof(conn->cb_addr));
3298
3299	if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
3300		goto out_err;
3301
3302	if (conn->cb_addr.ss_family == AF_INET6)
3303		((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
3304
3305	conn->cb_prog = se->se_callback_prog;
3306	conn->cb_ident = se->se_callback_ident;
3307	memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
3308	trace_nfsd_cb_args(clp, conn);
3309	return;
3310out_err:
3311	conn->cb_addr.ss_family = AF_UNSPEC;
3312	conn->cb_addrlen = 0;
3313	trace_nfsd_cb_nodelegs(clp);
 
 
 
3314	return;
3315}
3316
3317/*
3318 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
3319 */
3320static void
3321nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
3322{
3323	struct xdr_buf *buf = resp->xdr->buf;
3324	struct nfsd4_slot *slot = resp->cstate.slot;
3325	unsigned int base;
3326
3327	dprintk("--> %s slot %p\n", __func__, slot);
3328
3329	slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
3330	slot->sl_opcnt = resp->opcnt;
3331	slot->sl_status = resp->cstate.status;
3332	free_svc_cred(&slot->sl_cred);
3333	copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
3334
3335	if (!nfsd4_cache_this(resp)) {
3336		slot->sl_flags &= ~NFSD4_SLOT_CACHED;
3337		return;
3338	}
3339	slot->sl_flags |= NFSD4_SLOT_CACHED;
3340
3341	base = resp->cstate.data_offset;
3342	slot->sl_datalen = buf->len - base;
3343	if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
3344		WARN(1, "%s: sessions DRC could not cache compound\n",
3345		     __func__);
3346	return;
3347}
3348
3349/*
3350 * Encode the replay sequence operation from the slot values.
3351 * If cachethis is FALSE encode the uncached rep error on the next
3352 * operation which sets resp->p and increments resp->opcnt for
3353 * nfs4svc_encode_compoundres.
3354 *
3355 */
3356static __be32
3357nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
3358			  struct nfsd4_compoundres *resp)
3359{
3360	struct nfsd4_op *op;
3361	struct nfsd4_slot *slot = resp->cstate.slot;
3362
3363	/* Encode the replayed sequence operation */
3364	op = &args->ops[resp->opcnt - 1];
3365	nfsd4_encode_operation(resp, op);
3366
3367	if (slot->sl_flags & NFSD4_SLOT_CACHED)
3368		return op->status;
3369	if (args->opcnt == 1) {
3370		/*
3371		 * The original operation wasn't a solo sequence--we
3372		 * always cache those--so this retry must not match the
3373		 * original:
3374		 */
3375		op->status = nfserr_seq_false_retry;
3376	} else {
3377		op = &args->ops[resp->opcnt++];
3378		op->status = nfserr_retry_uncached_rep;
3379		nfsd4_encode_operation(resp, op);
3380	}
3381	return op->status;
3382}
3383
3384/*
3385 * The sequence operation is not cached because we can use the slot and
3386 * session values.
3387 */
3388static __be32
3389nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
3390			 struct nfsd4_sequence *seq)
3391{
3392	struct nfsd4_slot *slot = resp->cstate.slot;
3393	struct xdr_stream *xdr = resp->xdr;
3394	__be32 *p;
3395	__be32 status;
3396
3397	dprintk("--> %s slot %p\n", __func__, slot);
3398
3399	status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
3400	if (status)
3401		return status;
3402
3403	p = xdr_reserve_space(xdr, slot->sl_datalen);
3404	if (!p) {
3405		WARN_ON_ONCE(1);
3406		return nfserr_serverfault;
3407	}
3408	xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
3409	xdr_commit_encode(xdr);
3410
3411	resp->opcnt = slot->sl_opcnt;
3412	return slot->sl_status;
3413}
3414
3415/*
3416 * Set the exchange_id flags returned by the server.
3417 */
3418static void
3419nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3420{
3421#ifdef CONFIG_NFSD_PNFS
3422	new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3423#else
3424	new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3425#endif
3426
3427	/* Referrals are supported, Migration is not. */
3428	new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3429
3430	/* set the wire flags to return to client. */
3431	clid->flags = new->cl_exchange_flags;
3432}
3433
3434static bool client_has_openowners(struct nfs4_client *clp)
3435{
3436	struct nfs4_openowner *oo;
3437
3438	list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3439		if (!list_empty(&oo->oo_owner.so_stateids))
3440			return true;
3441	}
3442	return false;
3443}
3444
3445static bool client_has_state(struct nfs4_client *clp)
3446{
3447	return client_has_openowners(clp)
3448#ifdef CONFIG_NFSD_PNFS
3449		|| !list_empty(&clp->cl_lo_states)
3450#endif
3451		|| !list_empty(&clp->cl_delegations)
3452		|| !list_empty(&clp->cl_sessions)
3453		|| !list_empty(&clp->async_copies);
3454}
3455
3456static __be32 copy_impl_id(struct nfs4_client *clp,
3457				struct nfsd4_exchange_id *exid)
3458{
3459	if (!exid->nii_domain.data)
3460		return 0;
3461	xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3462	if (!clp->cl_nii_domain.data)
3463		return nfserr_jukebox;
3464	xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3465	if (!clp->cl_nii_name.data)
3466		return nfserr_jukebox;
3467	clp->cl_nii_time = exid->nii_time;
3468	return 0;
3469}
3470
3471__be32
3472nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3473		union nfsd4_op_u *u)
3474{
3475	struct nfsd4_exchange_id *exid = &u->exchange_id;
3476	struct nfs4_client *conf, *new;
3477	struct nfs4_client *unconf = NULL;
3478	__be32 status;
3479	char			addr_str[INET6_ADDRSTRLEN];
3480	nfs4_verifier		verf = exid->verifier;
3481	struct sockaddr		*sa = svc_addr(rqstp);
3482	bool	update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3483	struct nfsd_net		*nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3484
3485	rpc_ntop(sa, addr_str, sizeof(addr_str));
3486	dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3487		"ip_addr=%s flags %x, spa_how %u\n",
3488		__func__, rqstp, exid, exid->clname.len, exid->clname.data,
3489		addr_str, exid->flags, exid->spa_how);
3490
3491	if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3492		return nfserr_inval;
3493
3494	new = create_client(exid->clname, rqstp, &verf);
3495	if (new == NULL)
3496		return nfserr_jukebox;
3497	status = copy_impl_id(new, exid);
3498	if (status)
3499		goto out_nolock;
3500
3501	switch (exid->spa_how) {
3502	case SP4_MACH_CRED:
3503		exid->spo_must_enforce[0] = 0;
3504		exid->spo_must_enforce[1] = (
3505			1 << (OP_BIND_CONN_TO_SESSION - 32) |
3506			1 << (OP_EXCHANGE_ID - 32) |
3507			1 << (OP_CREATE_SESSION - 32) |
3508			1 << (OP_DESTROY_SESSION - 32) |
3509			1 << (OP_DESTROY_CLIENTID - 32));
3510
3511		exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3512					1 << (OP_OPEN_DOWNGRADE) |
3513					1 << (OP_LOCKU) |
3514					1 << (OP_DELEGRETURN));
3515
3516		exid->spo_must_allow[1] &= (
3517					1 << (OP_TEST_STATEID - 32) |
3518					1 << (OP_FREE_STATEID - 32));
3519		if (!svc_rqst_integrity_protected(rqstp)) {
3520			status = nfserr_inval;
3521			goto out_nolock;
3522		}
3523		/*
3524		 * Sometimes userspace doesn't give us a principal.
3525		 * Which is a bug, really.  Anyway, we can't enforce
3526		 * MACH_CRED in that case, better to give up now:
3527		 */
3528		if (!new->cl_cred.cr_principal &&
3529					!new->cl_cred.cr_raw_principal) {
3530			status = nfserr_serverfault;
3531			goto out_nolock;
3532		}
3533		new->cl_mach_cred = true;
3534		break;
3535	case SP4_NONE:
3536		break;
3537	default:				/* checked by xdr code */
3538		WARN_ON_ONCE(1);
3539		fallthrough;
3540	case SP4_SSV:
3541		status = nfserr_encr_alg_unsupp;
3542		goto out_nolock;
3543	}
3544
3545	/* Cases below refer to rfc 5661 section 18.35.4: */
3546	spin_lock(&nn->client_lock);
3547	conf = find_confirmed_client_by_name(&exid->clname, nn);
3548	if (conf) {
3549		bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3550		bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3551
3552		if (update) {
3553			if (!clp_used_exchangeid(conf)) { /* buggy client */
3554				status = nfserr_inval;
3555				goto out;
3556			}
3557			if (!nfsd4_mach_creds_match(conf, rqstp)) {
3558				status = nfserr_wrong_cred;
3559				goto out;
3560			}
3561			if (!creds_match) { /* case 9 */
3562				status = nfserr_perm;
3563				goto out;
3564			}
3565			if (!verfs_match) { /* case 8 */
3566				status = nfserr_not_same;
3567				goto out;
3568			}
3569			/* case 6 */
3570			exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3571			trace_nfsd_clid_confirmed_r(conf);
3572			goto out_copy;
3573		}
3574		if (!creds_match) { /* case 3 */
3575			if (client_has_state(conf)) {
3576				status = nfserr_clid_inuse;
3577				trace_nfsd_clid_cred_mismatch(conf, rqstp);
3578				goto out;
3579			}
3580			goto out_new;
3581		}
3582		if (verfs_match) { /* case 2 */
3583			conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3584			trace_nfsd_clid_confirmed_r(conf);
3585			goto out_copy;
3586		}
3587		/* case 5, client reboot */
3588		trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
3589		conf = NULL;
3590		goto out_new;
3591	}
3592
3593	if (update) { /* case 7 */
3594		status = nfserr_noent;
3595		goto out;
3596	}
3597
3598	unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3599	if (unconf) /* case 4, possible retry or client restart */
3600		unhash_client_locked(unconf);
3601
3602	/* case 1, new owner ID */
3603	trace_nfsd_clid_fresh(new);
3604
3605out_new:
3606	if (conf) {
3607		status = mark_client_expired_locked(conf);
3608		if (status)
3609			goto out;
3610		trace_nfsd_clid_replaced(&conf->cl_clientid);
3611	}
3612	new->cl_minorversion = cstate->minorversion;
3613	new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3614	new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3615
3616	/* Contrived initial CREATE_SESSION response */
3617	new->cl_cs_slot.sl_status = nfserr_seq_misordered;
3618
3619	add_to_unconfirmed(new);
3620	swap(new, conf);
3621out_copy:
3622	exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3623	exid->clientid.cl_id = conf->cl_clientid.cl_id;
3624
3625	exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3626	nfsd4_set_ex_flags(conf, exid);
3627
3628	dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3629		conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3630	status = nfs_ok;
3631
3632out:
3633	spin_unlock(&nn->client_lock);
3634out_nolock:
3635	if (new)
3636		expire_client(new);
3637	if (unconf) {
3638		trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
3639		expire_client(unconf);
3640	}
3641	return status;
3642}
3643
3644static __be32
3645check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3646{
3647	dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3648		slot_seqid);
3649
3650	/* The slot is in use, and no response has been sent. */
3651	if (slot_inuse) {
3652		if (seqid == slot_seqid)
3653			return nfserr_jukebox;
3654		else
3655			return nfserr_seq_misordered;
3656	}
3657	/* Note unsigned 32-bit arithmetic handles wraparound: */
3658	if (likely(seqid == slot_seqid + 1))
3659		return nfs_ok;
3660	if (seqid == slot_seqid)
3661		return nfserr_replay_cache;
3662	return nfserr_seq_misordered;
3663}
3664
3665/*
3666 * Cache the create session result into the create session single DRC
3667 * slot cache by saving the xdr structure. sl_seqid has been set.
3668 * Do this for solo or embedded create session operations.
3669 */
3670static void
3671nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3672			   struct nfsd4_clid_slot *slot, __be32 nfserr)
3673{
3674	slot->sl_status = nfserr;
3675	memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3676}
3677
3678static __be32
3679nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3680			    struct nfsd4_clid_slot *slot)
3681{
3682	memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3683	return slot->sl_status;
3684}
3685
3686#define NFSD_MIN_REQ_HDR_SEQ_SZ	((\
3687			2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3688			1 +	/* MIN tag is length with zero, only length */ \
3689			3 +	/* version, opcount, opcode */ \
3690			XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3691				/* seqid, slotID, slotID, cache */ \
3692			4 ) * sizeof(__be32))
3693
3694#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3695			2 +	/* verifier: AUTH_NULL, length 0 */\
3696			1 +	/* status */ \
3697			1 +	/* MIN tag is length with zero, only length */ \
3698			3 +	/* opcount, opcode, opstatus*/ \
3699			XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3700				/* seqid, slotID, slotID, slotID, status */ \
3701			5 ) * sizeof(__be32))
3702
3703static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3704{
3705	u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3706
3707	if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3708		return nfserr_toosmall;
3709	if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3710		return nfserr_toosmall;
3711	ca->headerpadsz = 0;
3712	ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3713	ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3714	ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3715	ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3716			NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3717	ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3718	/*
3719	 * Note decreasing slot size below client's request may make it
3720	 * difficult for client to function correctly, whereas
3721	 * decreasing the number of slots will (just?) affect
3722	 * performance.  When short on memory we therefore prefer to
3723	 * decrease number of slots instead of their size.  Clients that
3724	 * request larger slots than they need will get poor results:
3725	 * Note that we always allow at least one slot, because our
3726	 * accounting is soft and provides no guarantees either way.
3727	 */
3728	ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
 
 
3729
3730	return nfs_ok;
3731}
3732
3733/*
3734 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3735 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3736 */
3737#define RPC_MAX_HEADER_WITH_AUTH_SYS \
3738	(RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3739
3740#define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3741	(RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3742
3743#define NFSD_CB_MAX_REQ_SZ	((NFS4_enc_cb_recall_sz + \
3744				 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3745#define NFSD_CB_MAX_RESP_SZ	((NFS4_dec_cb_recall_sz + \
3746				 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3747				 sizeof(__be32))
3748
3749static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3750{
3751	ca->headerpadsz = 0;
3752
3753	if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3754		return nfserr_toosmall;
3755	if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3756		return nfserr_toosmall;
3757	ca->maxresp_cached = 0;
3758	if (ca->maxops < 2)
3759		return nfserr_toosmall;
3760
3761	return nfs_ok;
3762}
3763
3764static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3765{
3766	switch (cbs->flavor) {
3767	case RPC_AUTH_NULL:
3768	case RPC_AUTH_UNIX:
3769		return nfs_ok;
3770	default:
3771		/*
3772		 * GSS case: the spec doesn't allow us to return this
3773		 * error.  But it also doesn't allow us not to support
3774		 * GSS.
3775		 * I'd rather this fail hard than return some error the
3776		 * client might think it can already handle:
3777		 */
3778		return nfserr_encr_alg_unsupp;
3779	}
3780}
3781
3782__be32
3783nfsd4_create_session(struct svc_rqst *rqstp,
3784		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3785{
3786	struct nfsd4_create_session *cr_ses = &u->create_session;
3787	struct sockaddr *sa = svc_addr(rqstp);
3788	struct nfs4_client *conf, *unconf;
3789	struct nfsd4_clid_slot *cs_slot;
3790	struct nfs4_client *old = NULL;
3791	struct nfsd4_session *new;
3792	struct nfsd4_conn *conn;
 
3793	__be32 status = 0;
3794	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3795
3796	if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3797		return nfserr_inval;
3798	status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3799	if (status)
3800		return status;
3801	status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3802	if (status)
3803		return status;
3804	status = check_backchannel_attrs(&cr_ses->back_channel);
3805	if (status)
3806		goto out_release_drc_mem;
3807	status = nfserr_jukebox;
3808	new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3809	if (!new)
3810		goto out_release_drc_mem;
3811	conn = alloc_conn_from_crses(rqstp, cr_ses);
3812	if (!conn)
3813		goto out_free_session;
3814
3815	spin_lock(&nn->client_lock);
3816
3817	/* RFC 8881 Section 18.36.4 Phase 1: Client record look-up. */
3818	unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3819	conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3820	if (!conf && !unconf) {
3821		status = nfserr_stale_clientid;
3822		goto out_free_conn;
3823	}
3824
3825	/* RFC 8881 Section 18.36.4 Phase 2: Sequence ID processing. */
3826	if (conf)
3827		cs_slot = &conf->cl_cs_slot;
3828	else
3829		cs_slot = &unconf->cl_cs_slot;
3830	status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3831	switch (status) {
3832	case nfs_ok:
3833		cs_slot->sl_seqid++;
3834		cr_ses->seqid = cs_slot->sl_seqid;
3835		break;
3836	case nfserr_replay_cache:
3837		status = nfsd4_replay_create_session(cr_ses, cs_slot);
3838		fallthrough;
3839	case nfserr_jukebox:
3840		/* The server MUST NOT cache NFS4ERR_DELAY */
3841		goto out_free_conn;
3842	default:
3843		goto out_cache_error;
3844	}
3845
3846	/* RFC 8881 Section 18.36.4 Phase 3: Client ID confirmation. */
3847	if (conf) {
3848		status = nfserr_wrong_cred;
3849		if (!nfsd4_mach_creds_match(conf, rqstp))
3850			goto out_cache_error;
3851	} else {
3852		status = nfserr_clid_inuse;
 
 
 
 
 
 
3853		if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3854		    !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3855			trace_nfsd_clid_cred_mismatch(unconf, rqstp);
3856			goto out_cache_error;
3857		}
3858		status = nfserr_wrong_cred;
3859		if (!nfsd4_mach_creds_match(unconf, rqstp))
3860			goto out_cache_error;
 
 
 
 
 
 
 
3861		old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3862		if (old) {
3863			status = mark_client_expired_locked(old);
3864			if (status)
3865				goto out_expired_error;
3866			trace_nfsd_clid_replaced(&old->cl_clientid);
 
3867		}
3868		move_to_confirmed(unconf);
3869		conf = unconf;
 
 
 
3870	}
3871
3872	/* RFC 8881 Section 18.36.4 Phase 4: Session creation. */
3873	status = nfs_ok;
3874	/* Persistent sessions are not supported */
3875	cr_ses->flags &= ~SESSION4_PERSIST;
3876	/* Upshifting from TCP to RDMA is not supported */
3877	cr_ses->flags &= ~SESSION4_RDMA;
3878
3879	init_session(rqstp, new, conf, cr_ses);
3880	nfsd4_get_session_locked(new);
3881
3882	memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3883	       NFS4_MAX_SESSIONID_LEN);
 
 
3884
3885	/* cache solo and embedded create sessions under the client_lock */
3886	nfsd4_cache_create_session(cr_ses, cs_slot, status);
3887	spin_unlock(&nn->client_lock);
3888	if (conf == unconf)
3889		fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
3890	/* init connection and backchannel */
3891	nfsd4_init_conn(rqstp, conn, new);
3892	nfsd4_put_session(new);
3893	if (old)
3894		expire_client(old);
3895	return status;
3896
3897out_expired_error:
3898	old = NULL;
3899	/*
3900	 * Revert the slot seq_nr change so the server will process
3901	 * the client's resend instead of returning a cached response.
3902	 */
3903	if (status == nfserr_jukebox) {
3904		cs_slot->sl_seqid--;
3905		cr_ses->seqid = cs_slot->sl_seqid;
3906		goto out_free_conn;
3907	}
3908out_cache_error:
3909	nfsd4_cache_create_session(cr_ses, cs_slot, status);
3910out_free_conn:
3911	spin_unlock(&nn->client_lock);
3912	free_conn(conn);
3913	if (old)
3914		expire_client(old);
3915out_free_session:
3916	__free_session(new);
3917out_release_drc_mem:
3918	nfsd4_put_drc_mem(&cr_ses->fore_channel);
3919	return status;
3920}
3921
3922static __be32 nfsd4_map_bcts_dir(u32 *dir)
3923{
3924	switch (*dir) {
3925	case NFS4_CDFC4_FORE:
3926	case NFS4_CDFC4_BACK:
3927		return nfs_ok;
3928	case NFS4_CDFC4_FORE_OR_BOTH:
3929	case NFS4_CDFC4_BACK_OR_BOTH:
3930		*dir = NFS4_CDFC4_BOTH;
3931		return nfs_ok;
3932	}
3933	return nfserr_inval;
3934}
3935
3936__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3937		struct nfsd4_compound_state *cstate,
3938		union nfsd4_op_u *u)
3939{
3940	struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3941	struct nfsd4_session *session = cstate->session;
3942	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3943	__be32 status;
3944
3945	status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3946	if (status)
3947		return status;
3948	spin_lock(&nn->client_lock);
3949	session->se_cb_prog = bc->bc_cb_program;
3950	session->se_cb_sec = bc->bc_cb_sec;
3951	spin_unlock(&nn->client_lock);
3952
3953	nfsd4_probe_callback(session->se_client);
3954
3955	return nfs_ok;
3956}
3957
3958static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3959{
3960	struct nfsd4_conn *c;
3961
3962	list_for_each_entry(c, &s->se_conns, cn_persession) {
3963		if (c->cn_xprt == xpt) {
3964			return c;
3965		}
3966	}
3967	return NULL;
3968}
3969
3970static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
3971		struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
3972{
3973	struct nfs4_client *clp = session->se_client;
3974	struct svc_xprt *xpt = rqst->rq_xprt;
3975	struct nfsd4_conn *c;
3976	__be32 status;
3977
3978	/* Following the last paragraph of RFC 5661 Section 18.34.3: */
3979	spin_lock(&clp->cl_lock);
3980	c = __nfsd4_find_conn(xpt, session);
3981	if (!c)
3982		status = nfserr_noent;
3983	else if (req == c->cn_flags)
3984		status = nfs_ok;
3985	else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
3986				c->cn_flags != NFS4_CDFC4_BACK)
3987		status = nfs_ok;
3988	else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
3989				c->cn_flags != NFS4_CDFC4_FORE)
3990		status = nfs_ok;
3991	else
3992		status = nfserr_inval;
3993	spin_unlock(&clp->cl_lock);
3994	if (status == nfs_ok && conn)
3995		*conn = c;
3996	return status;
3997}
3998
3999__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
4000		     struct nfsd4_compound_state *cstate,
4001		     union nfsd4_op_u *u)
4002{
4003	struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
4004	__be32 status;
4005	struct nfsd4_conn *conn;
4006	struct nfsd4_session *session;
4007	struct net *net = SVC_NET(rqstp);
4008	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4009
4010	if (!nfsd4_last_compound_op(rqstp))
4011		return nfserr_not_only_op;
4012	spin_lock(&nn->client_lock);
4013	session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
4014	spin_unlock(&nn->client_lock);
4015	if (!session)
4016		goto out_no_session;
4017	status = nfserr_wrong_cred;
4018	if (!nfsd4_mach_creds_match(session->se_client, rqstp))
4019		goto out;
4020	status = nfsd4_match_existing_connection(rqstp, session,
4021			bcts->dir, &conn);
4022	if (status == nfs_ok) {
4023		if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
4024				bcts->dir == NFS4_CDFC4_BACK)
4025			conn->cn_flags |= NFS4_CDFC4_BACK;
4026		nfsd4_probe_callback(session->se_client);
4027		goto out;
4028	}
4029	if (status == nfserr_inval)
4030		goto out;
4031	status = nfsd4_map_bcts_dir(&bcts->dir);
4032	if (status)
4033		goto out;
4034	conn = alloc_conn(rqstp, bcts->dir);
4035	status = nfserr_jukebox;
4036	if (!conn)
4037		goto out;
4038	nfsd4_init_conn(rqstp, conn, session);
4039	status = nfs_ok;
4040out:
4041	nfsd4_put_session(session);
4042out_no_session:
4043	return status;
4044}
4045
4046static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
4047{
4048	if (!cstate->session)
4049		return false;
4050	return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
4051}
4052
4053__be32
4054nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
4055		union nfsd4_op_u *u)
4056{
4057	struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
4058	struct nfsd4_session *ses;
4059	__be32 status;
4060	int ref_held_by_me = 0;
4061	struct net *net = SVC_NET(r);
4062	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4063
4064	status = nfserr_not_only_op;
4065	if (nfsd4_compound_in_session(cstate, sessionid)) {
4066		if (!nfsd4_last_compound_op(r))
4067			goto out;
4068		ref_held_by_me++;
4069	}
4070	dump_sessionid(__func__, sessionid);
4071	spin_lock(&nn->client_lock);
4072	ses = find_in_sessionid_hashtbl(sessionid, net, &status);
4073	if (!ses)
4074		goto out_client_lock;
4075	status = nfserr_wrong_cred;
4076	if (!nfsd4_mach_creds_match(ses->se_client, r))
4077		goto out_put_session;
4078	status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
4079	if (status)
4080		goto out_put_session;
4081	unhash_session(ses);
4082	spin_unlock(&nn->client_lock);
4083
4084	nfsd4_probe_callback_sync(ses->se_client);
4085
4086	spin_lock(&nn->client_lock);
4087	status = nfs_ok;
4088out_put_session:
4089	nfsd4_put_session_locked(ses);
4090out_client_lock:
4091	spin_unlock(&nn->client_lock);
4092out:
4093	return status;
4094}
4095
 
 
 
 
 
 
 
 
 
 
 
 
4096static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
4097{
4098	struct nfs4_client *clp = ses->se_client;
4099	struct nfsd4_conn *c;
4100	__be32 status = nfs_ok;
4101	int ret;
4102
4103	spin_lock(&clp->cl_lock);
4104	c = __nfsd4_find_conn(new->cn_xprt, ses);
4105	if (c)
4106		goto out_free;
4107	status = nfserr_conn_not_bound_to_session;
4108	if (clp->cl_mach_cred)
4109		goto out_free;
4110	__nfsd4_hash_conn(new, ses);
4111	spin_unlock(&clp->cl_lock);
4112	ret = nfsd4_register_conn(new);
4113	if (ret)
4114		/* oops; xprt is already down: */
4115		nfsd4_conn_lost(&new->cn_xpt_user);
4116	return nfs_ok;
4117out_free:
4118	spin_unlock(&clp->cl_lock);
4119	free_conn(new);
4120	return status;
4121}
4122
4123static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
4124{
4125	struct nfsd4_compoundargs *args = rqstp->rq_argp;
4126
4127	return args->opcnt > session->se_fchannel.maxops;
4128}
4129
4130static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
4131				  struct nfsd4_session *session)
4132{
4133	struct xdr_buf *xb = &rqstp->rq_arg;
4134
4135	return xb->len > session->se_fchannel.maxreq_sz;
4136}
4137
4138static bool replay_matches_cache(struct svc_rqst *rqstp,
4139		 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
4140{
4141	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
4142
4143	if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
4144	    (bool)seq->cachethis)
4145		return false;
4146	/*
4147	 * If there's an error then the reply can have fewer ops than
4148	 * the call.
 
 
4149	 */
4150	if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
4151		return false;
4152	/*
4153	 * But if we cached a reply with *more* ops than the call you're
4154	 * sending us now, then this new call is clearly not really a
4155	 * replay of the old one:
4156	 */
4157	if (slot->sl_opcnt > argp->opcnt)
4158		return false;
4159	/* This is the only check explicitly called by spec: */
4160	if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
4161		return false;
4162	/*
4163	 * There may be more comparisons we could actually do, but the
4164	 * spec doesn't require us to catch every case where the calls
4165	 * don't match (that would require caching the call as well as
4166	 * the reply), so we don't bother.
4167	 */
4168	return true;
4169}
4170
4171__be32
4172nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4173		union nfsd4_op_u *u)
4174{
4175	struct nfsd4_sequence *seq = &u->sequence;
4176	struct nfsd4_compoundres *resp = rqstp->rq_resp;
4177	struct xdr_stream *xdr = resp->xdr;
4178	struct nfsd4_session *session;
4179	struct nfs4_client *clp;
4180	struct nfsd4_slot *slot;
4181	struct nfsd4_conn *conn;
4182	__be32 status;
4183	int buflen;
4184	struct net *net = SVC_NET(rqstp);
4185	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4186
4187	if (resp->opcnt != 1)
4188		return nfserr_sequence_pos;
4189
4190	/*
4191	 * Will be either used or freed by nfsd4_sequence_check_conn
4192	 * below.
4193	 */
4194	conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
4195	if (!conn)
4196		return nfserr_jukebox;
4197
4198	spin_lock(&nn->client_lock);
4199	session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
4200	if (!session)
4201		goto out_no_session;
4202	clp = session->se_client;
4203
4204	status = nfserr_too_many_ops;
4205	if (nfsd4_session_too_many_ops(rqstp, session))
4206		goto out_put_session;
4207
4208	status = nfserr_req_too_big;
4209	if (nfsd4_request_too_big(rqstp, session))
4210		goto out_put_session;
4211
4212	status = nfserr_badslot;
4213	if (seq->slotid >= session->se_fchannel.maxreqs)
4214		goto out_put_session;
4215
4216	slot = session->se_slots[seq->slotid];
4217	dprintk("%s: slotid %d\n", __func__, seq->slotid);
4218
4219	/* We do not negotiate the number of slots yet, so set the
4220	 * maxslots to the session maxreqs which is used to encode
4221	 * sr_highest_slotid and the sr_target_slot id to maxslots */
4222	seq->maxslots = session->se_fchannel.maxreqs;
4223
4224	status = check_slot_seqid(seq->seqid, slot->sl_seqid,
4225					slot->sl_flags & NFSD4_SLOT_INUSE);
4226	if (status == nfserr_replay_cache) {
4227		status = nfserr_seq_misordered;
4228		if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
4229			goto out_put_session;
4230		status = nfserr_seq_false_retry;
4231		if (!replay_matches_cache(rqstp, seq, slot))
4232			goto out_put_session;
4233		cstate->slot = slot;
4234		cstate->session = session;
4235		cstate->clp = clp;
4236		/* Return the cached reply status and set cstate->status
4237		 * for nfsd4_proc_compound processing */
4238		status = nfsd4_replay_cache_entry(resp, seq);
4239		cstate->status = nfserr_replay_cache;
4240		goto out;
4241	}
4242	if (status)
4243		goto out_put_session;
4244
4245	status = nfsd4_sequence_check_conn(conn, session);
4246	conn = NULL;
4247	if (status)
4248		goto out_put_session;
4249
4250	buflen = (seq->cachethis) ?
4251			session->se_fchannel.maxresp_cached :
4252			session->se_fchannel.maxresp_sz;
4253	status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
4254				    nfserr_rep_too_big;
4255	if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
4256		goto out_put_session;
4257	svc_reserve(rqstp, buflen);
4258
4259	status = nfs_ok;
4260	/* Success! bump slot seqid */
4261	slot->sl_seqid = seq->seqid;
4262	slot->sl_flags |= NFSD4_SLOT_INUSE;
4263	if (seq->cachethis)
4264		slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
4265	else
4266		slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
4267
4268	cstate->slot = slot;
4269	cstate->session = session;
4270	cstate->clp = clp;
4271
4272out:
4273	switch (clp->cl_cb_state) {
4274	case NFSD4_CB_DOWN:
4275		seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
4276		break;
4277	case NFSD4_CB_FAULT:
4278		seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
4279		break;
4280	default:
4281		seq->status_flags = 0;
4282	}
4283	if (!list_empty(&clp->cl_revoked))
4284		seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
4285	if (atomic_read(&clp->cl_admin_revoked))
4286		seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED;
4287	trace_nfsd_seq4_status(rqstp, seq);
4288out_no_session:
4289	if (conn)
4290		free_conn(conn);
4291	spin_unlock(&nn->client_lock);
4292	return status;
4293out_put_session:
4294	nfsd4_put_session_locked(session);
4295	goto out_no_session;
4296}
4297
4298void
4299nfsd4_sequence_done(struct nfsd4_compoundres *resp)
4300{
4301	struct nfsd4_compound_state *cs = &resp->cstate;
4302
4303	if (nfsd4_has_session(cs)) {
4304		if (cs->status != nfserr_replay_cache) {
4305			nfsd4_store_cache_entry(resp);
4306			cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4307		}
4308		/* Drop session reference that was taken in nfsd4_sequence() */
4309		nfsd4_put_session(cs->session);
4310	} else if (cs->clp)
4311		put_client_renew(cs->clp);
4312}
4313
4314__be32
4315nfsd4_destroy_clientid(struct svc_rqst *rqstp,
4316		struct nfsd4_compound_state *cstate,
4317		union nfsd4_op_u *u)
4318{
4319	struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
4320	struct nfs4_client *conf, *unconf;
4321	struct nfs4_client *clp = NULL;
4322	__be32 status = 0;
4323	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4324
4325	spin_lock(&nn->client_lock);
4326	unconf = find_unconfirmed_client(&dc->clientid, true, nn);
4327	conf = find_confirmed_client(&dc->clientid, true, nn);
4328	WARN_ON_ONCE(conf && unconf);
4329
4330	if (conf) {
4331		if (client_has_state(conf)) {
4332			status = nfserr_clientid_busy;
4333			goto out;
4334		}
4335		status = mark_client_expired_locked(conf);
4336		if (status)
4337			goto out;
4338		clp = conf;
4339	} else if (unconf)
4340		clp = unconf;
4341	else {
4342		status = nfserr_stale_clientid;
4343		goto out;
4344	}
4345	if (!nfsd4_mach_creds_match(clp, rqstp)) {
4346		clp = NULL;
4347		status = nfserr_wrong_cred;
4348		goto out;
4349	}
4350	trace_nfsd_clid_destroyed(&clp->cl_clientid);
4351	unhash_client_locked(clp);
4352out:
4353	spin_unlock(&nn->client_lock);
4354	if (clp)
4355		expire_client(clp);
4356	return status;
4357}
4358
4359__be32
4360nfsd4_reclaim_complete(struct svc_rqst *rqstp,
4361		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
4362{
4363	struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
4364	struct nfs4_client *clp = cstate->clp;
4365	__be32 status = 0;
4366
4367	if (rc->rca_one_fs) {
4368		if (!cstate->current_fh.fh_dentry)
4369			return nfserr_nofilehandle;
4370		/*
4371		 * We don't take advantage of the rca_one_fs case.
4372		 * That's OK, it's optional, we can safely ignore it.
4373		 */
4374		return nfs_ok;
4375	}
4376
4377	status = nfserr_complete_already;
4378	if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
 
4379		goto out;
4380
4381	status = nfserr_stale_clientid;
4382	if (is_client_expired(clp))
4383		/*
4384		 * The following error isn't really legal.
4385		 * But we only get here if the client just explicitly
4386		 * destroyed the client.  Surely it no longer cares what
4387		 * error it gets back on an operation for the dead
4388		 * client.
4389		 */
4390		goto out;
4391
4392	status = nfs_ok;
4393	trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
4394	nfsd4_client_record_create(clp);
4395	inc_reclaim_complete(clp);
4396out:
4397	return status;
4398}
4399
4400__be32
4401nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4402		  union nfsd4_op_u *u)
4403{
4404	struct nfsd4_setclientid *setclid = &u->setclientid;
4405	struct xdr_netobj 	clname = setclid->se_name;
4406	nfs4_verifier		clverifier = setclid->se_verf;
4407	struct nfs4_client	*conf, *new;
4408	struct nfs4_client	*unconf = NULL;
4409	__be32 			status;
4410	struct nfsd_net		*nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4411
4412	new = create_client(clname, rqstp, &clverifier);
4413	if (new == NULL)
4414		return nfserr_jukebox;
 
4415	spin_lock(&nn->client_lock);
4416	conf = find_confirmed_client_by_name(&clname, nn);
4417	if (conf && client_has_state(conf)) {
 
4418		status = nfserr_clid_inuse;
4419		if (clp_used_exchangeid(conf))
4420			goto out;
4421		if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4422			trace_nfsd_clid_cred_mismatch(conf, rqstp);
 
 
 
 
4423			goto out;
4424		}
4425	}
4426	unconf = find_unconfirmed_client_by_name(&clname, nn);
4427	if (unconf)
4428		unhash_client_locked(unconf);
4429	if (conf) {
4430		if (same_verf(&conf->cl_verifier, &clverifier)) {
4431			copy_clid(new, conf);
4432			gen_confirm(new, nn);
4433		} else
4434			trace_nfsd_clid_verf_mismatch(conf, rqstp,
4435						      &clverifier);
4436	} else
4437		trace_nfsd_clid_fresh(new);
4438	new->cl_minorversion = 0;
4439	gen_callback(new, setclid, rqstp);
4440	add_to_unconfirmed(new);
4441	setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
4442	setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
4443	memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
4444	new = NULL;
4445	status = nfs_ok;
4446out:
4447	spin_unlock(&nn->client_lock);
4448	if (new)
4449		free_client(new);
4450	if (unconf) {
4451		trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
4452		expire_client(unconf);
4453	}
4454	return status;
4455}
4456
 
4457__be32
4458nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4459			struct nfsd4_compound_state *cstate,
4460			union nfsd4_op_u *u)
4461{
4462	struct nfsd4_setclientid_confirm *setclientid_confirm =
4463			&u->setclientid_confirm;
4464	struct nfs4_client *conf, *unconf;
4465	struct nfs4_client *old = NULL;
4466	nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
4467	clientid_t * clid = &setclientid_confirm->sc_clientid;
4468	__be32 status;
4469	struct nfsd_net	*nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4470
4471	if (STALE_CLIENTID(clid, nn))
4472		return nfserr_stale_clientid;
4473
4474	spin_lock(&nn->client_lock);
4475	conf = find_confirmed_client(clid, false, nn);
4476	unconf = find_unconfirmed_client(clid, false, nn);
4477	/*
4478	 * We try hard to give out unique clientid's, so if we get an
4479	 * attempt to confirm the same clientid with a different cred,
4480	 * the client may be buggy; this should never happen.
4481	 *
4482	 * Nevertheless, RFC 7530 recommends INUSE for this case:
4483	 */
4484	status = nfserr_clid_inuse;
4485	if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
4486		trace_nfsd_clid_cred_mismatch(unconf, rqstp);
4487		goto out;
4488	}
4489	if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4490		trace_nfsd_clid_cred_mismatch(conf, rqstp);
4491		goto out;
4492	}
4493	if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
4494		if (conf && same_verf(&confirm, &conf->cl_confirm)) {
 
4495			status = nfs_ok;
4496		} else
4497			status = nfserr_stale_clientid;
4498		goto out;
4499	}
4500	status = nfs_ok;
4501	if (conf) {
4502		old = unconf;
4503		unhash_client_locked(old);
4504		nfsd4_change_callback(conf, &unconf->cl_cb_conn);
4505	} else {
4506		old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4507		if (old) {
4508			status = nfserr_clid_inuse;
4509			if (client_has_state(old)
4510					&& !same_creds(&unconf->cl_cred,
4511							&old->cl_cred)) {
4512				old = NULL;
4513				goto out;
4514			}
4515			status = mark_client_expired_locked(old);
4516			if (status) {
4517				old = NULL;
4518				goto out;
4519			}
4520			trace_nfsd_clid_replaced(&old->cl_clientid);
4521		}
4522		move_to_confirmed(unconf);
4523		conf = unconf;
4524	}
4525	get_client_locked(conf);
4526	spin_unlock(&nn->client_lock);
4527	if (conf == unconf)
4528		fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
4529	nfsd4_probe_callback(conf);
4530	spin_lock(&nn->client_lock);
4531	put_client_renew_locked(conf);
4532out:
4533	spin_unlock(&nn->client_lock);
4534	if (old)
4535		expire_client(old);
4536	return status;
4537}
4538
4539static struct nfs4_file *nfsd4_alloc_file(void)
4540{
4541	return kmem_cache_alloc(file_slab, GFP_KERNEL);
4542}
4543
4544/* OPEN Share state helper functions */
4545
4546static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp)
4547{
 
 
4548	refcount_set(&fp->fi_ref, 1);
4549	spin_lock_init(&fp->fi_lock);
4550	INIT_LIST_HEAD(&fp->fi_stateids);
4551	INIT_LIST_HEAD(&fp->fi_delegations);
4552	INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4553	fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
4554	fp->fi_deleg_file = NULL;
4555	fp->fi_had_conflict = false;
4556	fp->fi_share_deny = 0;
4557	memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4558	memset(fp->fi_access, 0, sizeof(fp->fi_access));
4559	fp->fi_aliased = false;
4560	fp->fi_inode = d_inode(fh->fh_dentry);
4561#ifdef CONFIG_NFSD_PNFS
4562	INIT_LIST_HEAD(&fp->fi_lo_states);
4563	atomic_set(&fp->fi_lo_recalls, 0);
4564#endif
 
4565}
4566
4567void
4568nfsd4_free_slabs(void)
4569{
4570	kmem_cache_destroy(client_slab);
4571	kmem_cache_destroy(openowner_slab);
4572	kmem_cache_destroy(lockowner_slab);
4573	kmem_cache_destroy(file_slab);
4574	kmem_cache_destroy(stateid_slab);
4575	kmem_cache_destroy(deleg_slab);
4576	kmem_cache_destroy(odstate_slab);
4577}
4578
4579int
4580nfsd4_init_slabs(void)
4581{
4582	client_slab = KMEM_CACHE(nfs4_client, 0);
 
4583	if (client_slab == NULL)
4584		goto out;
4585	openowner_slab = KMEM_CACHE(nfs4_openowner, 0);
 
4586	if (openowner_slab == NULL)
4587		goto out_free_client_slab;
4588	lockowner_slab = KMEM_CACHE(nfs4_lockowner, 0);
 
4589	if (lockowner_slab == NULL)
4590		goto out_free_openowner_slab;
4591	file_slab = KMEM_CACHE(nfs4_file, 0);
 
4592	if (file_slab == NULL)
4593		goto out_free_lockowner_slab;
4594	stateid_slab = KMEM_CACHE(nfs4_ol_stateid, 0);
 
4595	if (stateid_slab == NULL)
4596		goto out_free_file_slab;
4597	deleg_slab = KMEM_CACHE(nfs4_delegation, 0);
 
4598	if (deleg_slab == NULL)
4599		goto out_free_stateid_slab;
4600	odstate_slab = KMEM_CACHE(nfs4_clnt_odstate, 0);
 
4601	if (odstate_slab == NULL)
4602		goto out_free_deleg_slab;
4603	return 0;
4604
4605out_free_deleg_slab:
4606	kmem_cache_destroy(deleg_slab);
4607out_free_stateid_slab:
4608	kmem_cache_destroy(stateid_slab);
4609out_free_file_slab:
4610	kmem_cache_destroy(file_slab);
4611out_free_lockowner_slab:
4612	kmem_cache_destroy(lockowner_slab);
4613out_free_openowner_slab:
4614	kmem_cache_destroy(openowner_slab);
4615out_free_client_slab:
4616	kmem_cache_destroy(client_slab);
4617out:
 
4618	return -ENOMEM;
4619}
4620
4621static unsigned long
4622nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
4623{
4624	int count;
4625	struct nfsd_net *nn = shrink->private_data;
4626
4627	count = atomic_read(&nn->nfsd_courtesy_clients);
4628	if (!count)
4629		count = atomic_long_read(&num_delegations);
4630	if (count)
4631		queue_work(laundry_wq, &nn->nfsd_shrinker_work);
4632	return (unsigned long)count;
4633}
4634
4635static unsigned long
4636nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
4637{
4638	return SHRINK_STOP;
4639}
4640
4641void
4642nfsd4_init_leases_net(struct nfsd_net *nn)
4643{
4644	struct sysinfo si;
4645	u64 max_clients;
4646
4647	nn->nfsd4_lease = 90;	/* default lease time */
4648	nn->nfsd4_grace = 90;
4649	nn->somebody_reclaimed = false;
4650	nn->track_reclaim_completes = false;
4651	nn->clverifier_counter = get_random_u32();
4652	nn->clientid_base = get_random_u32();
4653	nn->clientid_counter = nn->clientid_base + 1;
4654	nn->s2s_cp_cl_id = nn->clientid_counter++;
4655
4656	atomic_set(&nn->nfs4_client_count, 0);
4657	si_meminfo(&si);
4658	max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
4659	max_clients *= NFS4_CLIENTS_PER_GB;
4660	nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
4661
4662	atomic_set(&nn->nfsd_courtesy_clients, 0);
4663}
4664
4665static void init_nfs4_replay(struct nfs4_replay *rp)
4666{
4667	rp->rp_status = nfserr_serverfault;
4668	rp->rp_buflen = 0;
4669	rp->rp_buf = rp->rp_ibuf;
4670	mutex_init(&rp->rp_mutex);
4671}
4672
4673static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4674		struct nfs4_stateowner *so)
4675{
4676	if (!nfsd4_has_session(cstate)) {
4677		mutex_lock(&so->so_replay.rp_mutex);
4678		cstate->replay_owner = nfs4_get_stateowner(so);
4679	}
4680}
4681
4682void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4683{
4684	struct nfs4_stateowner *so = cstate->replay_owner;
4685
4686	if (so != NULL) {
4687		cstate->replay_owner = NULL;
4688		mutex_unlock(&so->so_replay.rp_mutex);
4689		nfs4_put_stateowner(so);
4690	}
4691}
4692
4693static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4694{
4695	struct nfs4_stateowner *sop;
4696
4697	sop = kmem_cache_alloc(slab, GFP_KERNEL);
4698	if (!sop)
4699		return NULL;
4700
4701	xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4702	if (!sop->so_owner.data) {
4703		kmem_cache_free(slab, sop);
4704		return NULL;
4705	}
 
4706
4707	INIT_LIST_HEAD(&sop->so_stateids);
4708	sop->so_client = clp;
4709	init_nfs4_replay(&sop->so_replay);
4710	atomic_set(&sop->so_count, 1);
4711	return sop;
4712}
4713
4714static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4715{
4716	lockdep_assert_held(&clp->cl_lock);
4717
4718	list_add(&oo->oo_owner.so_strhash,
4719		 &clp->cl_ownerstr_hashtbl[strhashval]);
4720	list_add(&oo->oo_perclient, &clp->cl_openowners);
4721}
4722
4723static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4724{
4725	unhash_openowner_locked(openowner(so));
4726}
4727
4728static void nfs4_free_openowner(struct nfs4_stateowner *so)
4729{
4730	struct nfs4_openowner *oo = openowner(so);
4731
4732	kmem_cache_free(openowner_slab, oo);
4733}
4734
4735static const struct nfs4_stateowner_operations openowner_ops = {
4736	.so_unhash =	nfs4_unhash_openowner,
4737	.so_free =	nfs4_free_openowner,
4738};
4739
4740static struct nfs4_ol_stateid *
4741nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4742{
4743	struct nfs4_ol_stateid *local, *ret = NULL;
4744	struct nfs4_openowner *oo = open->op_openowner;
4745
4746	lockdep_assert_held(&fp->fi_lock);
4747
4748	list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4749		/* ignore lock owners */
4750		if (local->st_stateowner->so_is_open_owner == 0)
4751			continue;
4752		if (local->st_stateowner != &oo->oo_owner)
4753			continue;
4754		if (local->st_stid.sc_type == SC_TYPE_OPEN &&
4755		    !local->st_stid.sc_status) {
4756			ret = local;
4757			refcount_inc(&ret->st_stid.sc_count);
4758			break;
4759		}
4760	}
4761	return ret;
4762}
4763
4764static void nfsd4_drop_revoked_stid(struct nfs4_stid *s)
4765	__releases(&s->sc_client->cl_lock)
4766{
4767	struct nfs4_client *cl = s->sc_client;
4768	LIST_HEAD(reaplist);
4769	struct nfs4_ol_stateid *stp;
4770	struct nfs4_delegation *dp;
4771	bool unhashed;
4772
4773	switch (s->sc_type) {
4774	case SC_TYPE_OPEN:
4775		stp = openlockstateid(s);
4776		if (unhash_open_stateid(stp, &reaplist))
4777			put_ol_stateid_locked(stp, &reaplist);
4778		spin_unlock(&cl->cl_lock);
4779		free_ol_stateid_reaplist(&reaplist);
4780		break;
4781	case SC_TYPE_LOCK:
4782		stp = openlockstateid(s);
4783		unhashed = unhash_lock_stateid(stp);
4784		spin_unlock(&cl->cl_lock);
4785		if (unhashed)
4786			nfs4_put_stid(s);
4787		break;
4788	case SC_TYPE_DELEG:
4789		dp = delegstateid(s);
4790		list_del_init(&dp->dl_recall_lru);
4791		spin_unlock(&cl->cl_lock);
4792		nfs4_put_stid(s);
4793		break;
4794	default:
4795		spin_unlock(&cl->cl_lock);
4796	}
4797}
4798
4799static void nfsd40_drop_revoked_stid(struct nfs4_client *cl,
4800				    stateid_t *stid)
4801{
4802	/* NFSv4.0 has no way for the client to tell the server
4803	 * that it can forget an admin-revoked stateid.
4804	 * So we keep it around until the first time that the
4805	 * client uses it, and drop it the first time
4806	 * nfserr_admin_revoked is returned.
4807	 * For v4.1 and later we wait until explicitly told
4808	 * to free the stateid.
4809	 */
4810	if (cl->cl_minorversion == 0) {
4811		struct nfs4_stid *st;
4812
4813		spin_lock(&cl->cl_lock);
4814		st = find_stateid_locked(cl, stid);
4815		if (st)
4816			nfsd4_drop_revoked_stid(st);
4817		else
4818			spin_unlock(&cl->cl_lock);
4819	}
4820}
4821
4822static __be32
4823nfsd4_verify_open_stid(struct nfs4_stid *s)
4824{
4825	__be32 ret = nfs_ok;
4826
4827	if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
4828		ret = nfserr_admin_revoked;
4829	else if (s->sc_status & SC_STATUS_REVOKED)
4830		ret = nfserr_deleg_revoked;
4831	else if (s->sc_status & SC_STATUS_CLOSED)
 
4832		ret = nfserr_bad_stateid;
 
 
 
 
4833	return ret;
4834}
4835
4836/* Lock the stateid st_mutex, and deal with races with CLOSE */
4837static __be32
4838nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4839{
4840	__be32 ret;
4841
4842	mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4843	ret = nfsd4_verify_open_stid(&stp->st_stid);
4844	if (ret == nfserr_admin_revoked)
4845		nfsd40_drop_revoked_stid(stp->st_stid.sc_client,
4846					&stp->st_stid.sc_stateid);
4847
4848	if (ret != nfs_ok)
4849		mutex_unlock(&stp->st_mutex);
4850	return ret;
4851}
4852
4853static struct nfs4_ol_stateid *
4854nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4855{
4856	struct nfs4_ol_stateid *stp;
4857	for (;;) {
4858		spin_lock(&fp->fi_lock);
4859		stp = nfsd4_find_existing_open(fp, open);
4860		spin_unlock(&fp->fi_lock);
4861		if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4862			break;
4863		nfs4_put_stid(&stp->st_stid);
4864	}
4865	return stp;
4866}
4867
4868static struct nfs4_openowner *
4869alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4870			   struct nfsd4_compound_state *cstate)
4871{
4872	struct nfs4_client *clp = cstate->clp;
4873	struct nfs4_openowner *oo, *ret;
4874
4875	oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4876	if (!oo)
4877		return NULL;
4878	oo->oo_owner.so_ops = &openowner_ops;
4879	oo->oo_owner.so_is_open_owner = 1;
4880	oo->oo_owner.so_seqid = open->op_seqid;
4881	oo->oo_flags = 0;
4882	if (nfsd4_has_session(cstate))
4883		oo->oo_flags |= NFS4_OO_CONFIRMED;
4884	oo->oo_time = 0;
4885	oo->oo_last_closed_stid = NULL;
4886	INIT_LIST_HEAD(&oo->oo_close_lru);
4887	spin_lock(&clp->cl_lock);
4888	ret = find_openstateowner_str_locked(strhashval, open, clp);
4889	if (ret == NULL) {
4890		hash_openowner(oo, clp, strhashval);
4891		ret = oo;
4892	} else
4893		nfs4_free_stateowner(&oo->oo_owner);
4894
4895	spin_unlock(&clp->cl_lock);
4896	return ret;
4897}
4898
4899static struct nfs4_ol_stateid *
4900init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4901{
4902
4903	struct nfs4_openowner *oo = open->op_openowner;
4904	struct nfs4_ol_stateid *retstp = NULL;
4905	struct nfs4_ol_stateid *stp;
4906
4907	stp = open->op_stp;
4908	/* We are moving these outside of the spinlocks to avoid the warnings */
4909	mutex_init(&stp->st_mutex);
4910	mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4911
4912retry:
4913	spin_lock(&oo->oo_owner.so_client->cl_lock);
4914	spin_lock(&fp->fi_lock);
4915
4916	retstp = nfsd4_find_existing_open(fp, open);
4917	if (retstp)
4918		goto out_unlock;
4919
4920	open->op_stp = NULL;
4921	refcount_inc(&stp->st_stid.sc_count);
4922	stp->st_stid.sc_type = SC_TYPE_OPEN;
4923	INIT_LIST_HEAD(&stp->st_locks);
4924	stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4925	get_nfs4_file(fp);
4926	stp->st_stid.sc_file = fp;
4927	stp->st_access_bmap = 0;
4928	stp->st_deny_bmap = 0;
4929	stp->st_openstp = NULL;
4930	list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4931	list_add(&stp->st_perfile, &fp->fi_stateids);
4932
4933out_unlock:
4934	spin_unlock(&fp->fi_lock);
4935	spin_unlock(&oo->oo_owner.so_client->cl_lock);
4936	if (retstp) {
4937		/* Handle races with CLOSE */
4938		if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4939			nfs4_put_stid(&retstp->st_stid);
4940			goto retry;
4941		}
4942		/* To keep mutex tracking happy */
4943		mutex_unlock(&stp->st_mutex);
4944		stp = retstp;
4945	}
4946	return stp;
4947}
4948
4949/*
4950 * In the 4.0 case we need to keep the owners around a little while to handle
4951 * CLOSE replay. We still do need to release any file access that is held by
4952 * them before returning however.
4953 */
4954static void
4955move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4956{
4957	struct nfs4_ol_stateid *last;
4958	struct nfs4_openowner *oo = openowner(s->st_stateowner);
4959	struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4960						nfsd_net_id);
4961
4962	dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4963
4964	/*
4965	 * We know that we hold one reference via nfsd4_close, and another
4966	 * "persistent" reference for the client. If the refcount is higher
4967	 * than 2, then there are still calls in progress that are using this
4968	 * stateid. We can't put the sc_file reference until they are finished.
4969	 * Wait for the refcount to drop to 2. Since it has been unhashed,
4970	 * there should be no danger of the refcount going back up again at
4971	 * this point.
4972	 */
4973	wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4974
4975	release_all_access(s);
4976	if (s->st_stid.sc_file) {
4977		put_nfs4_file(s->st_stid.sc_file);
4978		s->st_stid.sc_file = NULL;
4979	}
4980
4981	spin_lock(&nn->client_lock);
4982	last = oo->oo_last_closed_stid;
4983	oo->oo_last_closed_stid = s;
4984	list_move_tail(&oo->oo_close_lru, &nn->close_lru);
4985	oo->oo_time = ktime_get_boottime_seconds();
4986	spin_unlock(&nn->client_lock);
4987	if (last)
4988		nfs4_put_stid(&last->st_stid);
4989}
4990
4991static noinline_for_stack struct nfs4_file *
4992nfsd4_file_hash_lookup(const struct svc_fh *fhp)
 
4993{
4994	struct inode *inode = d_inode(fhp->fh_dentry);
4995	struct rhlist_head *tmp, *list;
4996	struct nfs4_file *fi;
4997
4998	rcu_read_lock();
4999	list = rhltable_lookup(&nfs4_file_rhltable, &inode,
5000			       nfs4_file_rhash_params);
5001	rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
5002		if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
5003			if (refcount_inc_not_zero(&fi->fi_ref)) {
5004				rcu_read_unlock();
5005				return fi;
5006			}
5007		}
5008	}
5009	rcu_read_unlock();
5010	return NULL;
5011}
5012
5013/*
5014 * On hash insertion, identify entries with the same inode but
5015 * distinct filehandles. They will all be on the list returned
5016 * by rhltable_lookup().
5017 *
5018 * inode->i_lock prevents racing insertions from adding an entry
5019 * for the same inode/fhp pair twice.
5020 */
5021static noinline_for_stack struct nfs4_file *
5022nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp)
5023{
5024	struct inode *inode = d_inode(fhp->fh_dentry);
5025	struct rhlist_head *tmp, *list;
5026	struct nfs4_file *ret = NULL;
5027	bool alias_found = false;
5028	struct nfs4_file *fi;
5029	int err;
5030
5031	rcu_read_lock();
5032	spin_lock(&inode->i_lock);
5033
5034	list = rhltable_lookup(&nfs4_file_rhltable, &inode,
5035			       nfs4_file_rhash_params);
5036	rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
5037		if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
5038			if (refcount_inc_not_zero(&fi->fi_ref))
5039				ret = fi;
5040		} else
5041			fi->fi_aliased = alias_found = true;
5042	}
5043	if (ret)
5044		goto out_unlock;
5045
5046	nfsd4_file_init(fhp, new);
5047	err = rhltable_insert(&nfs4_file_rhltable, &new->fi_rlist,
5048			      nfs4_file_rhash_params);
5049	if (err)
5050		goto out_unlock;
5051
5052	new->fi_aliased = alias_found;
5053	ret = new;
5054
5055out_unlock:
5056	spin_unlock(&inode->i_lock);
5057	rcu_read_unlock();
5058	return ret;
5059}
5060
5061static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi)
 
5062{
5063	rhltable_remove(&nfs4_file_rhltable, &fi->fi_rlist,
5064			nfs4_file_rhash_params);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5065}
5066
5067/*
5068 * Called to check deny when READ with all zero stateid or
5069 * WRITE with all zero or all one stateid
5070 */
5071static __be32
5072nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
5073{
5074	struct nfs4_file *fp;
5075	__be32 ret = nfs_ok;
5076
5077	fp = nfsd4_file_hash_lookup(current_fh);
5078	if (!fp)
5079		return ret;
5080
5081	/* Check for conflicting share reservations */
5082	spin_lock(&fp->fi_lock);
5083	if (fp->fi_share_deny & deny_type)
5084		ret = nfserr_locked;
5085	spin_unlock(&fp->fi_lock);
5086	put_nfs4_file(fp);
5087	return ret;
5088}
5089
5090static bool nfsd4_deleg_present(const struct inode *inode)
5091{
5092	struct file_lock_context *ctx = locks_inode_context(inode);
5093
5094	return ctx && !list_empty_careful(&ctx->flc_lease);
5095}
5096
5097/**
5098 * nfsd_wait_for_delegreturn - wait for delegations to be returned
5099 * @rqstp: the RPC transaction being executed
5100 * @inode: in-core inode of the file being waited for
5101 *
5102 * The timeout prevents deadlock if all nfsd threads happen to be
5103 * tied up waiting for returning delegations.
5104 *
5105 * Return values:
5106 *   %true: delegation was returned
5107 *   %false: timed out waiting for delegreturn
5108 */
5109bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
5110{
5111	long __maybe_unused timeo;
5112
5113	timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
5114				       NFSD_DELEGRETURN_TIMEOUT);
5115	trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
5116	return timeo > 0;
5117}
5118
5119static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
5120{
5121	struct nfs4_delegation *dp = cb_to_delegation(cb);
5122	struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
5123					  nfsd_net_id);
5124
5125	block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
5126
5127	/*
5128	 * We can't do this in nfsd_break_deleg_cb because it is
5129	 * already holding inode->i_lock.
5130	 *
5131	 * If the dl_time != 0, then we know that it has already been
5132	 * queued for a lease break. Don't queue it again.
5133	 */
5134	spin_lock(&state_lock);
5135	if (delegation_hashed(dp) && dp->dl_time == 0) {
5136		dp->dl_time = ktime_get_boottime_seconds();
5137		list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
5138	}
5139	spin_unlock(&state_lock);
5140}
5141
5142static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
5143		struct rpc_task *task)
5144{
5145	struct nfs4_delegation *dp = cb_to_delegation(cb);
5146
5147	trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
5148
5149	if (dp->dl_stid.sc_status)
5150		/* CLOSED or REVOKED */
5151		return 1;
5152
5153	switch (task->tk_status) {
5154	case 0:
5155		return 1;
5156	case -NFS4ERR_DELAY:
5157		rpc_delay(task, 2 * HZ);
5158		return 0;
5159	case -EBADHANDLE:
5160	case -NFS4ERR_BAD_STATEID:
5161		/*
5162		 * Race: client probably got cb_recall before open reply
5163		 * granting delegation.
5164		 */
5165		if (dp->dl_retries--) {
5166			rpc_delay(task, 2 * HZ);
5167			return 0;
5168		}
5169		fallthrough;
5170	default:
5171		return 1;
5172	}
5173}
5174
5175static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
5176{
5177	struct nfs4_delegation *dp = cb_to_delegation(cb);
5178
5179	nfs4_put_stid(&dp->dl_stid);
5180}
5181
5182static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
5183	.prepare	= nfsd4_cb_recall_prepare,
5184	.done		= nfsd4_cb_recall_done,
5185	.release	= nfsd4_cb_recall_release,
5186};
5187
5188static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
5189{
5190	/*
5191	 * We're assuming the state code never drops its reference
5192	 * without first removing the lease.  Since we're in this lease
5193	 * callback (and since the lease code is serialized by the
5194	 * flc_lock) we know the server hasn't removed the lease yet, and
5195	 * we know it's safe to take a reference.
5196	 */
5197	refcount_inc(&dp->dl_stid.sc_count);
5198	WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
5199}
5200
5201/* Called from break_lease() with flc_lock held. */
5202static bool
5203nfsd_break_deleg_cb(struct file_lease *fl)
5204{
5205	struct nfs4_delegation *dp = (struct nfs4_delegation *) fl->c.flc_owner;
 
5206	struct nfs4_file *fp = dp->dl_stid.sc_file;
5207	struct nfs4_client *clp = dp->dl_stid.sc_client;
5208	struct nfsd_net *nn;
5209
5210	trace_nfsd_cb_recall(&dp->dl_stid);
5211
5212	dp->dl_recalled = true;
5213	atomic_inc(&clp->cl_delegs_in_recall);
5214	if (try_to_expire_client(clp)) {
5215		nn = net_generic(clp->net, nfsd_net_id);
5216		mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
5217	}
5218
5219	/*
5220	 * We don't want the locks code to timeout the lease for us;
5221	 * we'll remove it ourself if a delegation isn't returned
5222	 * in time:
5223	 */
5224	fl->fl_break_time = 0;
5225
 
5226	fp->fi_had_conflict = true;
5227	nfsd_break_one_deleg(dp);
5228	return false;
5229}
5230
5231/**
5232 * nfsd_breaker_owns_lease - Check if lease conflict was resolved
5233 * @fl: Lock state to check
5234 *
5235 * Return values:
5236 *   %true: Lease conflict was resolved
5237 *   %false: Lease conflict was not resolved.
5238 */
5239static bool nfsd_breaker_owns_lease(struct file_lease *fl)
5240{
5241	struct nfs4_delegation *dl = fl->c.flc_owner;
5242	struct svc_rqst *rqst;
5243	struct nfs4_client *clp;
5244
5245	if (!i_am_nfsd())
5246		return false;
5247	rqst = kthread_data(current);
5248	/* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
5249	if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
5250		return false;
5251	clp = *(rqst->rq_lease_breaker);
5252	return dl->dl_stid.sc_client == clp;
5253}
5254
5255static int
5256nfsd_change_deleg_cb(struct file_lease *onlist, int arg,
5257		     struct list_head *dispose)
5258{
5259	struct nfs4_delegation *dp = (struct nfs4_delegation *) onlist->c.flc_owner;
5260	struct nfs4_client *clp = dp->dl_stid.sc_client;
5261
5262	if (arg & F_UNLCK) {
5263		if (dp->dl_recalled)
5264			atomic_dec(&clp->cl_delegs_in_recall);
5265		return lease_modify(onlist, arg, dispose);
5266	} else
5267		return -EAGAIN;
5268}
5269
5270static const struct lease_manager_operations nfsd_lease_mng_ops = {
5271	.lm_breaker_owns_lease = nfsd_breaker_owns_lease,
5272	.lm_break = nfsd_break_deleg_cb,
5273	.lm_change = nfsd_change_deleg_cb,
5274};
5275
5276static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
5277{
5278	if (nfsd4_has_session(cstate))
5279		return nfs_ok;
5280	if (seqid == so->so_seqid - 1)
5281		return nfserr_replay_me;
5282	if (seqid == so->so_seqid)
5283		return nfs_ok;
5284	return nfserr_bad_seqid;
5285}
5286
5287static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
5288						struct nfsd_net *nn)
5289{
5290	struct nfs4_client *found;
5291
5292	spin_lock(&nn->client_lock);
5293	found = find_confirmed_client(clid, sessions, nn);
5294	if (found)
5295		atomic_inc(&found->cl_rpc_users);
5296	spin_unlock(&nn->client_lock);
5297	return found;
5298}
5299
5300static __be32 set_client(clientid_t *clid,
5301		struct nfsd4_compound_state *cstate,
5302		struct nfsd_net *nn)
5303{
 
 
5304	if (cstate->clp) {
5305		if (!same_clid(&cstate->clp->cl_clientid, clid))
 
5306			return nfserr_stale_clientid;
5307		return nfs_ok;
5308	}
 
5309	if (STALE_CLIENTID(clid, nn))
5310		return nfserr_stale_clientid;
 
5311	/*
5312	 * We're in the 4.0 case (otherwise the SEQUENCE op would have
5313	 * set cstate->clp), so session = false:
 
5314	 */
5315	cstate->clp = lookup_clientid(clid, false, nn);
5316	if (!cstate->clp)
 
 
 
5317		return nfserr_expired;
 
 
 
 
 
 
5318	return nfs_ok;
5319}
5320
5321__be32
5322nfsd4_process_open1(struct nfsd4_compound_state *cstate,
5323		    struct nfsd4_open *open, struct nfsd_net *nn)
5324{
5325	clientid_t *clientid = &open->op_clientid;
5326	struct nfs4_client *clp = NULL;
5327	unsigned int strhashval;
5328	struct nfs4_openowner *oo = NULL;
5329	__be32 status;
5330
 
 
5331	/*
5332	 * In case we need it later, after we've already created the
5333	 * file and don't want to risk a further failure:
5334	 */
5335	open->op_file = nfsd4_alloc_file();
5336	if (open->op_file == NULL)
5337		return nfserr_jukebox;
5338
5339	status = set_client(clientid, cstate, nn);
5340	if (status)
5341		return status;
5342	clp = cstate->clp;
5343
5344	strhashval = ownerstr_hashval(&open->op_owner);
5345	oo = find_openstateowner_str(strhashval, open, clp);
5346	open->op_openowner = oo;
5347	if (!oo) {
5348		goto new_owner;
5349	}
5350	if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5351		/* Replace unconfirmed owners without checking for replay. */
5352		release_openowner(oo);
5353		open->op_openowner = NULL;
5354		goto new_owner;
5355	}
5356	status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
5357	if (status)
5358		return status;
5359	goto alloc_stateid;
5360new_owner:
5361	oo = alloc_init_open_stateowner(strhashval, open, cstate);
5362	if (oo == NULL)
5363		return nfserr_jukebox;
5364	open->op_openowner = oo;
5365alloc_stateid:
5366	open->op_stp = nfs4_alloc_open_stateid(clp);
5367	if (!open->op_stp)
5368		return nfserr_jukebox;
5369
5370	if (nfsd4_has_session(cstate) &&
5371	    (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
5372		open->op_odstate = alloc_clnt_odstate(clp);
5373		if (!open->op_odstate)
5374			return nfserr_jukebox;
5375	}
5376
5377	return nfs_ok;
5378}
5379
5380static inline __be32
5381nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
5382{
5383	if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
5384		return nfserr_openmode;
5385	else
5386		return nfs_ok;
5387}
5388
5389static int share_access_to_flags(u32 share_access)
5390{
5391	return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
5392}
5393
5394static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl,
5395						  stateid_t *s)
5396{
5397	struct nfs4_stid *ret;
5398
5399	ret = find_stateid_by_type(cl, s, SC_TYPE_DELEG, SC_STATUS_REVOKED);
 
5400	if (!ret)
5401		return NULL;
5402	return delegstateid(ret);
5403}
5404
5405static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
5406{
5407	return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
5408	       open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
5409}
5410
5411static __be32
5412nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
5413		struct nfs4_delegation **dp)
5414{
5415	int flags;
5416	__be32 status = nfserr_bad_stateid;
5417	struct nfs4_delegation *deleg;
5418
5419	deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
5420	if (deleg == NULL)
5421		goto out;
5422	if (deleg->dl_stid.sc_status & SC_STATUS_ADMIN_REVOKED) {
5423		nfs4_put_stid(&deleg->dl_stid);
5424		status = nfserr_admin_revoked;
5425		goto out;
5426	}
5427	if (deleg->dl_stid.sc_status & SC_STATUS_REVOKED) {
5428		nfs4_put_stid(&deleg->dl_stid);
5429		nfsd40_drop_revoked_stid(cl, &open->op_delegate_stateid);
5430		status = nfserr_deleg_revoked;
5431		goto out;
5432	}
5433	flags = share_access_to_flags(open->op_share_access);
5434	status = nfs4_check_delegmode(deleg, flags);
5435	if (status) {
5436		nfs4_put_stid(&deleg->dl_stid);
5437		goto out;
5438	}
5439	*dp = deleg;
5440out:
5441	if (!nfsd4_is_deleg_cur(open))
5442		return nfs_ok;
5443	if (status)
5444		return status;
5445	open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5446	return nfs_ok;
5447}
5448
5449static inline int nfs4_access_to_access(u32 nfs4_access)
5450{
5451	int flags = 0;
5452
5453	if (nfs4_access & NFS4_SHARE_ACCESS_READ)
5454		flags |= NFSD_MAY_READ;
5455	if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
5456		flags |= NFSD_MAY_WRITE;
5457	return flags;
5458}
5459
5460static inline __be32
5461nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
5462		struct nfsd4_open *open)
5463{
5464	struct iattr iattr = {
5465		.ia_valid = ATTR_SIZE,
5466		.ia_size = 0,
5467	};
5468	struct nfsd_attrs attrs = {
5469		.na_iattr	= &iattr,
5470	};
5471	if (!open->op_truncate)
5472		return 0;
5473	if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
5474		return nfserr_inval;
5475	return nfsd_setattr(rqstp, fh, &attrs, NULL);
5476}
5477
5478static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
5479		struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5480		struct nfsd4_open *open, bool new_stp)
5481{
5482	struct nfsd_file *nf = NULL;
5483	__be32 status;
5484	int oflag = nfs4_access_to_omode(open->op_share_access);
5485	int access = nfs4_access_to_access(open->op_share_access);
5486	unsigned char old_access_bmap, old_deny_bmap;
5487
5488	spin_lock(&fp->fi_lock);
5489
5490	/*
5491	 * Are we trying to set a deny mode that would conflict with
5492	 * current access?
5493	 */
5494	status = nfs4_file_check_deny(fp, open->op_share_deny);
5495	if (status != nfs_ok) {
5496		if (status != nfserr_share_denied) {
5497			spin_unlock(&fp->fi_lock);
5498			goto out;
5499		}
5500		if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5501				stp, open->op_share_deny, false))
5502			status = nfserr_jukebox;
5503		spin_unlock(&fp->fi_lock);
5504		goto out;
5505	}
5506
5507	/* set access to the file */
5508	status = nfs4_file_get_access(fp, open->op_share_access);
5509	if (status != nfs_ok) {
5510		if (status != nfserr_share_denied) {
5511			spin_unlock(&fp->fi_lock);
5512			goto out;
5513		}
5514		if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5515				stp, open->op_share_access, true))
5516			status = nfserr_jukebox;
5517		spin_unlock(&fp->fi_lock);
5518		goto out;
5519	}
5520
5521	/* Set access bits in stateid */
5522	old_access_bmap = stp->st_access_bmap;
5523	set_access(open->op_share_access, stp);
5524
5525	/* Set new deny mask */
5526	old_deny_bmap = stp->st_deny_bmap;
5527	set_deny(open->op_share_deny, stp);
5528	fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5529
5530	if (!fp->fi_fds[oflag]) {
5531		spin_unlock(&fp->fi_lock);
5532
5533		status = nfsd_file_acquire_opened(rqstp, cur_fh, access,
5534						  open->op_filp, &nf);
5535		if (status != nfs_ok)
5536			goto out_put_access;
5537
5538		spin_lock(&fp->fi_lock);
5539		if (!fp->fi_fds[oflag]) {
5540			fp->fi_fds[oflag] = nf;
5541			nf = NULL;
5542		}
5543	}
5544	spin_unlock(&fp->fi_lock);
5545	if (nf)
5546		nfsd_file_put(nf);
5547
5548	status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
5549								access));
5550	if (status)
5551		goto out_put_access;
5552
5553	status = nfsd4_truncate(rqstp, cur_fh, open);
5554	if (status)
5555		goto out_put_access;
5556out:
5557	return status;
5558out_put_access:
5559	stp->st_access_bmap = old_access_bmap;
5560	nfs4_file_put_access(fp, open->op_share_access);
5561	reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
5562	goto out;
5563}
5564
5565static __be32
5566nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
5567		struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5568		struct nfsd4_open *open)
5569{
5570	__be32 status;
5571	unsigned char old_deny_bmap = stp->st_deny_bmap;
5572
5573	if (!test_access(open->op_share_access, stp))
5574		return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
5575
5576	/* test and set deny mode */
5577	spin_lock(&fp->fi_lock);
5578	status = nfs4_file_check_deny(fp, open->op_share_deny);
5579	switch (status) {
5580	case nfs_ok:
5581		set_deny(open->op_share_deny, stp);
5582		fp->fi_share_deny |=
5583			(open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5584		break;
5585	case nfserr_share_denied:
5586		if (nfs4_resolve_deny_conflicts_locked(fp, false,
5587				stp, open->op_share_deny, false))
5588			status = nfserr_jukebox;
5589		break;
5590	}
5591	spin_unlock(&fp->fi_lock);
5592
5593	if (status != nfs_ok)
5594		return status;
5595
5596	status = nfsd4_truncate(rqstp, cur_fh, open);
5597	if (status != nfs_ok)
5598		reset_union_bmap_deny(old_deny_bmap, stp);
5599	return status;
5600}
5601
5602/* Should we give out recallable state?: */
5603static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
5604{
5605	if (clp->cl_cb_state == NFSD4_CB_UP)
5606		return true;
5607	/*
5608	 * In the sessions case, since we don't have to establish a
5609	 * separate connection for callbacks, we assume it's OK
5610	 * until we hear otherwise:
5611	 */
5612	return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
5613}
5614
5615static struct file_lease *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
5616						int flag)
5617{
5618	struct file_lease *fl;
5619
5620	fl = locks_alloc_lease();
5621	if (!fl)
5622		return NULL;
5623	fl->fl_lmops = &nfsd_lease_mng_ops;
5624	fl->c.flc_flags = FL_DELEG;
5625	fl->c.flc_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
5626	fl->c.flc_owner = (fl_owner_t)dp;
5627	fl->c.flc_pid = current->tgid;
5628	fl->c.flc_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
 
5629	return fl;
5630}
5631
5632static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
5633					 struct nfs4_file *fp)
5634{
5635	struct nfs4_ol_stateid *st;
5636	struct file *f = fp->fi_deleg_file->nf_file;
5637	struct inode *ino = file_inode(f);
5638	int writes;
5639
5640	writes = atomic_read(&ino->i_writecount);
5641	if (!writes)
5642		return 0;
5643	/*
5644	 * There could be multiple filehandles (hence multiple
5645	 * nfs4_files) referencing this file, but that's not too
5646	 * common; let's just give up in that case rather than
5647	 * trying to go look up all the clients using that other
5648	 * nfs4_file as well:
5649	 */
5650	if (fp->fi_aliased)
5651		return -EAGAIN;
5652	/*
5653	 * If there's a close in progress, make sure that we see it
5654	 * clear any fi_fds[] entries before we see it decrement
5655	 * i_writecount:
5656	 */
5657	smp_mb__after_atomic();
5658
5659	if (fp->fi_fds[O_WRONLY])
5660		writes--;
5661	if (fp->fi_fds[O_RDWR])
5662		writes--;
5663	if (writes > 0)
5664		return -EAGAIN; /* There may be non-NFSv4 writers */
5665	/*
5666	 * It's possible there are non-NFSv4 write opens in progress,
5667	 * but if they haven't incremented i_writecount yet then they
5668	 * also haven't called break lease yet; so, they'll break this
5669	 * lease soon enough.  So, all that's left to check for is NFSv4
5670	 * opens:
5671	 */
5672	spin_lock(&fp->fi_lock);
5673	list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5674		if (st->st_openstp == NULL /* it's an open */ &&
5675		    access_permit_write(st) &&
5676		    st->st_stid.sc_client != clp) {
5677			spin_unlock(&fp->fi_lock);
5678			return -EAGAIN;
5679		}
5680	}
5681	spin_unlock(&fp->fi_lock);
5682	/*
5683	 * There's a small chance that we could be racing with another
5684	 * NFSv4 open.  However, any open that hasn't added itself to
5685	 * the fi_stateids list also hasn't called break_lease yet; so,
5686	 * they'll break this lease soon enough.
5687	 */
5688	return 0;
5689}
5690
5691/*
5692 * It's possible that between opening the dentry and setting the delegation,
5693 * that it has been renamed or unlinked. Redo the lookup to verify that this
5694 * hasn't happened.
5695 */
5696static int
5697nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
5698			  struct svc_fh *parent)
5699{
5700	struct svc_export *exp;
5701	struct dentry *child;
5702	__be32 err;
5703
5704	err = nfsd_lookup_dentry(open->op_rqstp, parent,
5705				 open->op_fname, open->op_fnamelen,
5706				 &exp, &child);
5707
5708	if (err)
5709		return -EAGAIN;
5710
5711	exp_put(exp);
5712	dput(child);
5713	if (child != file_dentry(fp->fi_deleg_file->nf_file))
5714		return -EAGAIN;
5715
5716	return 0;
5717}
5718
5719/*
5720 * We avoid breaking delegations held by a client due to its own activity, but
5721 * clearing setuid/setgid bits on a write is an implicit activity and the client
5722 * may not notice and continue using the old mode. Avoid giving out a delegation
5723 * on setuid/setgid files when the client is requesting an open for write.
5724 */
5725static int
5726nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf)
5727{
5728	struct inode *inode = file_inode(nf->nf_file);
5729
5730	if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) &&
5731	    (inode->i_mode & (S_ISUID|S_ISGID)))
5732		return -EAGAIN;
5733	return 0;
5734}
5735
5736static struct nfs4_delegation *
5737nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5738		    struct svc_fh *parent)
5739{
5740	int status = 0;
5741	struct nfs4_client *clp = stp->st_stid.sc_client;
5742	struct nfs4_file *fp = stp->st_stid.sc_file;
5743	struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
5744	struct nfs4_delegation *dp;
5745	struct nfsd_file *nf = NULL;
5746	struct file_lease *fl;
5747	u32 dl_type;
5748
5749	/*
5750	 * The fi_had_conflict and nfs_get_existing_delegation checks
5751	 * here are just optimizations; we'll need to recheck them at
5752	 * the end:
5753	 */
5754	if (fp->fi_had_conflict)
5755		return ERR_PTR(-EAGAIN);
5756
5757	/*
5758	 * Try for a write delegation first. RFC8881 section 10.4 says:
5759	 *
5760	 *  "An OPEN_DELEGATE_WRITE delegation allows the client to handle,
5761	 *   on its own, all opens."
5762	 *
5763	 * Furthermore the client can use a write delegation for most READ
5764	 * operations as well, so we require a O_RDWR file here.
5765	 *
5766	 * Offer a write delegation in the case of a BOTH open, and ensure
5767	 * we get the O_RDWR descriptor.
5768	 */
5769	if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) == NFS4_SHARE_ACCESS_BOTH) {
5770		nf = find_rw_file(fp);
5771		dl_type = NFS4_OPEN_DELEGATE_WRITE;
5772	}
5773
5774	/*
5775	 * If the file is being opened O_RDONLY or we couldn't get a O_RDWR
5776	 * file for some reason, then try for a read delegation instead.
5777	 */
5778	if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) {
5779		nf = find_readable_file(fp);
5780		dl_type = NFS4_OPEN_DELEGATE_READ;
5781	}
5782
5783	if (!nf)
5784		return ERR_PTR(-EAGAIN);
5785
5786	spin_lock(&state_lock);
5787	spin_lock(&fp->fi_lock);
5788	if (nfs4_delegation_exists(clp, fp))
5789		status = -EAGAIN;
5790	else if (nfsd4_verify_setuid_write(open, nf))
5791		status = -EAGAIN;
5792	else if (!fp->fi_deleg_file) {
5793		fp->fi_deleg_file = nf;
5794		/* increment early to prevent fi_deleg_file from being
5795		 * cleared */
5796		fp->fi_delegees = 1;
5797		nf = NULL;
5798	} else
5799		fp->fi_delegees++;
5800	spin_unlock(&fp->fi_lock);
5801	spin_unlock(&state_lock);
5802	if (nf)
5803		nfsd_file_put(nf);
5804	if (status)
5805		return ERR_PTR(status);
5806
5807	status = -ENOMEM;
5808	dp = alloc_init_deleg(clp, fp, odstate, dl_type);
5809	if (!dp)
5810		goto out_delegees;
5811
5812	fl = nfs4_alloc_init_lease(dp, dl_type);
5813	if (!fl)
5814		goto out_clnt_odstate;
5815
5816	status = kernel_setlease(fp->fi_deleg_file->nf_file,
5817				      fl->c.flc_type, &fl, NULL);
5818	if (fl)
5819		locks_free_lease(fl);
5820	if (status)
5821		goto out_clnt_odstate;
5822
5823	if (parent) {
5824		status = nfsd4_verify_deleg_dentry(open, fp, parent);
5825		if (status)
5826			goto out_unlock;
5827	}
5828
5829	status = nfsd4_check_conflicting_opens(clp, fp);
5830	if (status)
5831		goto out_unlock;
5832
5833	/*
5834	 * Now that the deleg is set, check again to ensure that nothing
5835	 * raced in and changed the mode while we weren't lookng.
5836	 */
5837	status = nfsd4_verify_setuid_write(open, fp->fi_deleg_file);
5838	if (status)
5839		goto out_unlock;
5840
5841	status = -EAGAIN;
5842	if (fp->fi_had_conflict)
5843		goto out_unlock;
5844
5845	spin_lock(&state_lock);
5846	spin_lock(&clp->cl_lock);
5847	spin_lock(&fp->fi_lock);
5848	status = hash_delegation_locked(dp, fp);
 
 
 
5849	spin_unlock(&fp->fi_lock);
5850	spin_unlock(&clp->cl_lock);
5851	spin_unlock(&state_lock);
5852
5853	if (status)
5854		goto out_unlock;
5855
5856	return dp;
5857out_unlock:
5858	kernel_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
5859out_clnt_odstate:
5860	put_clnt_odstate(dp->dl_clnt_odstate);
 
5861	nfs4_put_stid(&dp->dl_stid);
5862out_delegees:
5863	put_deleg_file(fp);
5864	return ERR_PTR(status);
5865}
5866
5867static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
5868{
5869	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5870	if (status == -EAGAIN)
5871		open->op_why_no_deleg = WND4_CONTENTION;
5872	else {
5873		open->op_why_no_deleg = WND4_RESOURCE;
5874		switch (open->op_deleg_want) {
5875		case NFS4_SHARE_WANT_READ_DELEG:
5876		case NFS4_SHARE_WANT_WRITE_DELEG:
5877		case NFS4_SHARE_WANT_ANY_DELEG:
5878			break;
5879		case NFS4_SHARE_WANT_CANCEL:
5880			open->op_why_no_deleg = WND4_CANCELLED;
5881			break;
5882		case NFS4_SHARE_WANT_NO_DELEG:
5883			WARN_ON_ONCE(1);
5884		}
5885	}
5886}
5887
5888/*
5889 * The Linux NFS server does not offer write delegations to NFSv4.0
5890 * clients in order to avoid conflicts between write delegations and
5891 * GETATTRs requesting CHANGE or SIZE attributes.
5892 *
5893 * With NFSv4.1 and later minorversions, the SEQUENCE operation that
5894 * begins each COMPOUND contains a client ID. Delegation recall can
5895 * be avoided when the server recognizes the client sending a
5896 * GETATTR also holds write delegation it conflicts with.
5897 *
5898 * However, the NFSv4.0 protocol does not enable a server to
5899 * determine that a GETATTR originated from the client holding the
5900 * conflicting delegation versus coming from some other client. Per
5901 * RFC 7530 Section 16.7.5, the server must recall or send a
5902 * CB_GETATTR even when the GETATTR originates from the client that
5903 * holds the conflicting delegation.
5904 *
5905 * An NFSv4.0 client can trigger a pathological situation if it
5906 * always sends a DELEGRETURN preceded by a conflicting GETATTR in
5907 * the same COMPOUND. COMPOUND execution will always stop at the
5908 * GETATTR and the DELEGRETURN will never get executed. The server
5909 * eventually revokes the delegation, which can result in loss of
5910 * open or lock state.
5911 */
5912static void
5913nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5914		     struct svc_fh *currentfh)
5915{
5916	struct nfs4_delegation *dp;
5917	struct nfs4_openowner *oo = openowner(stp->st_stateowner);
5918	struct nfs4_client *clp = stp->st_stid.sc_client;
5919	struct svc_fh *parent = NULL;
5920	int cb_up;
5921	int status = 0;
5922	struct kstat stat;
5923	struct path path;
5924
5925	cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
5926	open->op_recall = false;
5927	switch (open->op_claim_type) {
5928		case NFS4_OPEN_CLAIM_PREVIOUS:
5929			if (!cb_up)
5930				open->op_recall = true;
 
 
5931			break;
5932		case NFS4_OPEN_CLAIM_NULL:
5933			parent = currentfh;
5934			fallthrough;
5935		case NFS4_OPEN_CLAIM_FH:
5936			/*
5937			 * Let's not give out any delegations till everyone's
5938			 * had the chance to reclaim theirs, *and* until
5939			 * NLM locks have all been reclaimed:
5940			 */
5941			if (locks_in_grace(clp->net))
5942				goto out_no_deleg;
5943			if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5944				goto out_no_deleg;
5945			if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE &&
5946					!clp->cl_minorversion)
 
 
 
 
 
 
 
 
5947				goto out_no_deleg;
5948			break;
5949		default:
5950			goto out_no_deleg;
5951	}
5952	dp = nfs4_set_delegation(open, stp, parent);
5953	if (IS_ERR(dp))
5954		goto out_no_deleg;
5955
5956	memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5957
5958	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
5959		open->op_delegate_type = NFS4_OPEN_DELEGATE_WRITE;
5960		trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid);
5961		path.mnt = currentfh->fh_export->ex_path.mnt;
5962		path.dentry = currentfh->fh_dentry;
5963		if (vfs_getattr(&path, &stat,
5964				(STATX_SIZE | STATX_CTIME | STATX_CHANGE_COOKIE),
5965				AT_STATX_SYNC_AS_STAT)) {
5966			nfs4_put_stid(&dp->dl_stid);
5967			destroy_delegation(dp);
5968			goto out_no_deleg;
5969		}
5970		dp->dl_cb_fattr.ncf_cur_fsize = stat.size;
5971		dp->dl_cb_fattr.ncf_initial_cinfo =
5972			nfsd4_change_attribute(&stat, d_inode(currentfh->fh_dentry));
5973	} else {
5974		open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5975		trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
5976	}
5977	nfs4_put_stid(&dp->dl_stid);
5978	return;
5979out_no_deleg:
5980	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
5981	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
5982	    open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
5983		dprintk("NFSD: WARNING: refusing delegation reclaim\n");
5984		open->op_recall = true;
5985	}
5986
5987	/* 4.1 client asking for a delegation? */
5988	if (open->op_deleg_want)
5989		nfsd4_open_deleg_none_ext(open, status);
5990	return;
5991}
5992
5993static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
5994					struct nfs4_delegation *dp)
5995{
5996	if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
5997	    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5998		open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5999		open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
6000	} else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
6001		   dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
6002		open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
6003		open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
6004	}
6005	/* Otherwise the client must be confused wanting a delegation
6006	 * it already has, therefore we don't return
6007	 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
6008	 */
6009}
6010
6011/**
6012 * nfsd4_process_open2 - finish open processing
6013 * @rqstp: the RPC transaction being executed
6014 * @current_fh: NFSv4 COMPOUND's current filehandle
6015 * @open: OPEN arguments
6016 *
6017 * If successful, (1) truncate the file if open->op_truncate was
6018 * set, (2) set open->op_stateid, (3) set open->op_delegation.
6019 *
6020 * Returns %nfs_ok on success; otherwise an nfs4stat value in
6021 * network byte order is returned.
6022 */
6023__be32
6024nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
6025{
6026	struct nfsd4_compoundres *resp = rqstp->rq_resp;
6027	struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
6028	struct nfs4_file *fp = NULL;
6029	struct nfs4_ol_stateid *stp = NULL;
6030	struct nfs4_delegation *dp = NULL;
6031	__be32 status;
6032	bool new_stp = false;
6033
6034	/*
6035	 * Lookup file; if found, lookup stateid and check open request,
6036	 * and check for delegations in the process of being recalled.
6037	 * If not found, create the nfs4_file struct
6038	 */
6039	fp = nfsd4_file_hash_insert(open->op_file, current_fh);
6040	if (unlikely(!fp))
6041		return nfserr_jukebox;
6042	if (fp != open->op_file) {
6043		status = nfs4_check_deleg(cl, open, &dp);
6044		if (status)
6045			goto out;
6046		stp = nfsd4_find_and_lock_existing_open(fp, open);
6047	} else {
6048		open->op_file = NULL;
6049		status = nfserr_bad_stateid;
6050		if (nfsd4_is_deleg_cur(open))
6051			goto out;
6052	}
6053
6054	if (!stp) {
6055		stp = init_open_stateid(fp, open);
6056		if (!open->op_stp)
6057			new_stp = true;
6058	}
6059
6060	/*
6061	 * OPEN the file, or upgrade an existing OPEN.
6062	 * If truncate fails, the OPEN fails.
6063	 *
6064	 * stp is already locked.
6065	 */
6066	if (!new_stp) {
6067		/* Stateid was found, this is an OPEN upgrade */
6068		status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
6069		if (status) {
6070			mutex_unlock(&stp->st_mutex);
6071			goto out;
6072		}
6073	} else {
6074		status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
6075		if (status) {
 
6076			release_open_stateid(stp);
6077			mutex_unlock(&stp->st_mutex);
6078			goto out;
6079		}
6080
6081		stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
6082							open->op_odstate);
6083		if (stp->st_clnt_odstate == open->op_odstate)
6084			open->op_odstate = NULL;
6085	}
6086
6087	nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
6088	mutex_unlock(&stp->st_mutex);
6089
6090	if (nfsd4_has_session(&resp->cstate)) {
6091		if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
6092			open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
6093			open->op_why_no_deleg = WND4_NOT_WANTED;
6094			goto nodeleg;
6095		}
6096	}
6097
6098	/*
6099	* Attempt to hand out a delegation. No error return, because the
6100	* OPEN succeeds even if we fail.
6101	*/
6102	nfs4_open_delegation(open, stp, &resp->cstate.current_fh);
6103nodeleg:
6104	status = nfs_ok;
6105	trace_nfsd_open(&stp->st_stid.sc_stateid);
 
 
6106out:
6107	/* 4.1 client trying to upgrade/downgrade delegation? */
6108	if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
6109	    open->op_deleg_want)
6110		nfsd4_deleg_xgrade_none_ext(open, dp);
6111
6112	if (fp)
6113		put_nfs4_file(fp);
6114	if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
6115		open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
6116	/*
6117	* To finish the open response, we just need to set the rflags.
6118	*/
6119	open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6120	if (nfsd4_has_session(&resp->cstate))
6121		open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
6122	else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
6123		open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
6124
6125	if (dp)
6126		nfs4_put_stid(&dp->dl_stid);
6127	if (stp)
6128		nfs4_put_stid(&stp->st_stid);
6129
6130	return status;
6131}
6132
6133void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
6134			      struct nfsd4_open *open)
6135{
6136	if (open->op_openowner) {
6137		struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
6138
6139		nfsd4_cstate_assign_replay(cstate, so);
6140		nfs4_put_stateowner(so);
6141	}
6142	if (open->op_file)
6143		kmem_cache_free(file_slab, open->op_file);
6144	if (open->op_stp)
6145		nfs4_put_stid(&open->op_stp->st_stid);
6146	if (open->op_odstate)
6147		kmem_cache_free(odstate_slab, open->op_odstate);
6148}
6149
6150__be32
6151nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6152	    union nfsd4_op_u *u)
6153{
6154	clientid_t *clid = &u->renew;
6155	struct nfs4_client *clp;
6156	__be32 status;
6157	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6158
6159	trace_nfsd_clid_renew(clid);
6160	status = set_client(clid, cstate, nn);
 
6161	if (status)
6162		return status;
6163	clp = cstate->clp;
 
6164	if (!list_empty(&clp->cl_delegations)
6165			&& clp->cl_cb_state != NFSD4_CB_UP)
6166		return nfserr_cb_path_down;
6167	return nfs_ok;
 
 
6168}
6169
6170void
6171nfsd4_end_grace(struct nfsd_net *nn)
6172{
6173	/* do nothing if grace period already ended */
6174	if (nn->grace_ended)
6175		return;
6176
6177	trace_nfsd_grace_complete(nn);
6178	nn->grace_ended = true;
6179	/*
6180	 * If the server goes down again right now, an NFSv4
6181	 * client will still be allowed to reclaim after it comes back up,
6182	 * even if it hasn't yet had a chance to reclaim state this time.
6183	 *
6184	 */
6185	nfsd4_record_grace_done(nn);
6186	/*
6187	 * At this point, NFSv4 clients can still reclaim.  But if the
6188	 * server crashes, any that have not yet reclaimed will be out
6189	 * of luck on the next boot.
6190	 *
6191	 * (NFSv4.1+ clients are considered to have reclaimed once they
6192	 * call RECLAIM_COMPLETE.  NFSv4.0 clients are considered to
6193	 * have reclaimed after their first OPEN.)
6194	 */
6195	locks_end_grace(&nn->nfsd4_manager);
6196	/*
6197	 * At this point, and once lockd and/or any other containers
6198	 * exit their grace period, further reclaims will fail and
6199	 * regular locking can resume.
6200	 */
6201}
6202
6203/*
6204 * If we've waited a lease period but there are still clients trying to
6205 * reclaim, wait a little longer to give them a chance to finish.
6206 */
6207static bool clients_still_reclaiming(struct nfsd_net *nn)
6208{
6209	time64_t double_grace_period_end = nn->boot_time +
6210					   2 * nn->nfsd4_lease;
6211
6212	if (nn->track_reclaim_completes &&
6213			atomic_read(&nn->nr_reclaim_complete) ==
6214			nn->reclaim_str_hashtbl_size)
6215		return false;
6216	if (!nn->somebody_reclaimed)
6217		return false;
6218	nn->somebody_reclaimed = false;
6219	/*
6220	 * If we've given them *two* lease times to reclaim, and they're
6221	 * still not done, give up:
6222	 */
6223	if (ktime_get_boottime_seconds() > double_grace_period_end)
6224		return false;
6225	return true;
6226}
6227
6228struct laundry_time {
6229	time64_t cutoff;
6230	time64_t new_timeo;
6231};
6232
6233static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
6234{
6235	time64_t time_remaining;
6236
6237	if (last_refresh < lt->cutoff)
6238		return true;
6239	time_remaining = last_refresh - lt->cutoff;
6240	lt->new_timeo = min(lt->new_timeo, time_remaining);
6241	return false;
6242}
6243
6244#ifdef CONFIG_NFSD_V4_2_INTER_SSC
6245void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
6246{
6247	spin_lock_init(&nn->nfsd_ssc_lock);
6248	INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
6249	init_waitqueue_head(&nn->nfsd_ssc_waitq);
6250}
6251EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
6252
6253/*
6254 * This is called when nfsd is being shutdown, after all inter_ssc
6255 * cleanup were done, to destroy the ssc delayed unmount list.
6256 */
6257static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
6258{
6259	struct nfsd4_ssc_umount_item *ni = NULL;
6260	struct nfsd4_ssc_umount_item *tmp;
6261
6262	spin_lock(&nn->nfsd_ssc_lock);
6263	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6264		list_del(&ni->nsui_list);
6265		spin_unlock(&nn->nfsd_ssc_lock);
6266		mntput(ni->nsui_vfsmount);
6267		kfree(ni);
6268		spin_lock(&nn->nfsd_ssc_lock);
6269	}
6270	spin_unlock(&nn->nfsd_ssc_lock);
6271}
6272
6273static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
6274{
6275	bool do_wakeup = false;
6276	struct nfsd4_ssc_umount_item *ni = NULL;
6277	struct nfsd4_ssc_umount_item *tmp;
6278
6279	spin_lock(&nn->nfsd_ssc_lock);
6280	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6281		if (time_after(jiffies, ni->nsui_expire)) {
6282			if (refcount_read(&ni->nsui_refcnt) > 1)
6283				continue;
6284
6285			/* mark being unmount */
6286			ni->nsui_busy = true;
6287			spin_unlock(&nn->nfsd_ssc_lock);
6288			mntput(ni->nsui_vfsmount);
6289			spin_lock(&nn->nfsd_ssc_lock);
6290
6291			/* waiters need to start from begin of list */
6292			list_del(&ni->nsui_list);
6293			kfree(ni);
6294
6295			/* wakeup ssc_connect waiters */
6296			do_wakeup = true;
6297			continue;
6298		}
6299		break;
6300	}
6301	if (do_wakeup)
6302		wake_up_all(&nn->nfsd_ssc_waitq);
6303	spin_unlock(&nn->nfsd_ssc_lock);
6304}
6305#endif
6306
6307/* Check if any lock belonging to this lockowner has any blockers */
6308static bool
6309nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
6310{
6311	struct file_lock_context *ctx;
6312	struct nfs4_ol_stateid *stp;
6313	struct nfs4_file *nf;
6314
6315	list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
6316		nf = stp->st_stid.sc_file;
6317		ctx = locks_inode_context(nf->fi_inode);
6318		if (!ctx)
6319			continue;
6320		if (locks_owner_has_blockers(ctx, lo))
6321			return true;
6322	}
6323	return false;
6324}
6325
6326static bool
6327nfs4_anylock_blockers(struct nfs4_client *clp)
6328{
6329	int i;
6330	struct nfs4_stateowner *so;
6331	struct nfs4_lockowner *lo;
6332
6333	if (atomic_read(&clp->cl_delegs_in_recall))
6334		return true;
6335	spin_lock(&clp->cl_lock);
6336	for (i = 0; i < OWNER_HASH_SIZE; i++) {
6337		list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
6338				so_strhash) {
6339			if (so->so_is_open_owner)
6340				continue;
6341			lo = lockowner(so);
6342			if (nfs4_lockowner_has_blockers(lo)) {
6343				spin_unlock(&clp->cl_lock);
6344				return true;
6345			}
6346		}
6347	}
6348	spin_unlock(&clp->cl_lock);
6349	return false;
6350}
6351
6352static void
6353nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
6354				struct laundry_time *lt)
6355{
6356	unsigned int maxreap, reapcnt = 0;
6357	struct list_head *pos, *next;
6358	struct nfs4_client *clp;
 
 
 
 
 
 
 
6359
6360	maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
6361			NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
6362	INIT_LIST_HEAD(reaplist);
6363	spin_lock(&nn->client_lock);
6364	list_for_each_safe(pos, next, &nn->client_lru) {
6365		clp = list_entry(pos, struct nfs4_client, cl_lru);
6366		if (clp->cl_state == NFSD4_EXPIRABLE)
6367			goto exp_client;
6368		if (!state_expired(lt, clp->cl_time))
6369			break;
6370		if (!atomic_read(&clp->cl_rpc_users)) {
6371			if (clp->cl_state == NFSD4_ACTIVE)
6372				atomic_inc(&nn->nfsd_courtesy_clients);
6373			clp->cl_state = NFSD4_COURTESY;
6374		}
6375		if (!client_has_state(clp))
6376			goto exp_client;
6377		if (!nfs4_anylock_blockers(clp))
6378			if (reapcnt >= maxreap)
6379				continue;
6380exp_client:
6381		if (!mark_client_expired_locked(clp)) {
6382			list_add(&clp->cl_lru, reaplist);
6383			reapcnt++;
6384		}
6385	}
6386	spin_unlock(&nn->client_lock);
6387}
6388
6389static void
6390nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
6391				struct list_head *reaplist)
6392{
6393	unsigned int maxreap = 0, reapcnt = 0;
6394	struct list_head *pos, *next;
6395	struct nfs4_client *clp;
6396
6397	maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
6398	INIT_LIST_HEAD(reaplist);
6399
6400	spin_lock(&nn->client_lock);
6401	list_for_each_safe(pos, next, &nn->client_lru) {
6402		clp = list_entry(pos, struct nfs4_client, cl_lru);
6403		if (clp->cl_state == NFSD4_ACTIVE)
6404			break;
6405		if (reapcnt >= maxreap)
6406			break;
6407		if (!mark_client_expired_locked(clp)) {
6408			list_add(&clp->cl_lru, reaplist);
6409			reapcnt++;
6410		}
 
6411	}
6412	spin_unlock(&nn->client_lock);
6413}
6414
6415static void
6416nfs4_process_client_reaplist(struct list_head *reaplist)
6417{
6418	struct list_head *pos, *next;
6419	struct nfs4_client *clp;
6420
6421	list_for_each_safe(pos, next, reaplist) {
6422		clp = list_entry(pos, struct nfs4_client, cl_lru);
6423		trace_nfsd_clid_purged(&clp->cl_clientid);
 
6424		list_del_init(&clp->cl_lru);
6425		expire_client(clp);
6426	}
6427}
6428
6429static void nfs40_clean_admin_revoked(struct nfsd_net *nn,
6430				      struct laundry_time *lt)
6431{
6432	struct nfs4_client *clp;
6433
6434	spin_lock(&nn->client_lock);
6435	if (nn->nfs40_last_revoke == 0 ||
6436	    nn->nfs40_last_revoke > lt->cutoff) {
6437		spin_unlock(&nn->client_lock);
6438		return;
6439	}
6440	nn->nfs40_last_revoke = 0;
6441
6442retry:
6443	list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6444		unsigned long id, tmp;
6445		struct nfs4_stid *stid;
6446
6447		if (atomic_read(&clp->cl_admin_revoked) == 0)
6448			continue;
6449
6450		spin_lock(&clp->cl_lock);
6451		idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
6452			if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
6453				refcount_inc(&stid->sc_count);
6454				spin_unlock(&nn->client_lock);
6455				/* this function drops ->cl_lock */
6456				nfsd4_drop_revoked_stid(stid);
6457				nfs4_put_stid(stid);
6458				spin_lock(&nn->client_lock);
6459				goto retry;
6460			}
6461		spin_unlock(&clp->cl_lock);
6462	}
6463	spin_unlock(&nn->client_lock);
6464}
6465
6466static time64_t
6467nfs4_laundromat(struct nfsd_net *nn)
6468{
6469	struct nfs4_openowner *oo;
6470	struct nfs4_delegation *dp;
6471	struct nfs4_ol_stateid *stp;
6472	struct nfsd4_blocked_lock *nbl;
6473	struct list_head *pos, *next, reaplist;
6474	struct laundry_time lt = {
6475		.cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
6476		.new_timeo = nn->nfsd4_lease
6477	};
6478	struct nfs4_cpntf_state *cps;
6479	copy_stateid_t *cps_t;
6480	int i;
6481
6482	if (clients_still_reclaiming(nn)) {
6483		lt.new_timeo = 0;
6484		goto out;
6485	}
6486	nfsd4_end_grace(nn);
6487
6488	spin_lock(&nn->s2s_cp_lock);
6489	idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
6490		cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
6491		if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
6492				state_expired(&lt, cps->cpntf_time))
6493			_free_cpntf_state_locked(nn, cps);
6494	}
6495	spin_unlock(&nn->s2s_cp_lock);
6496	nfs4_get_client_reaplist(nn, &reaplist, &lt);
6497	nfs4_process_client_reaplist(&reaplist);
6498
6499	nfs40_clean_admin_revoked(nn, &lt);
6500
6501	spin_lock(&state_lock);
6502	list_for_each_safe(pos, next, &nn->del_recall_lru) {
6503		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6504		if (!state_expired(&lt, dp->dl_time))
 
 
6505			break;
6506		unhash_delegation_locked(dp, SC_STATUS_REVOKED);
 
6507		list_add(&dp->dl_recall_lru, &reaplist);
6508	}
6509	spin_unlock(&state_lock);
6510	while (!list_empty(&reaplist)) {
6511		dp = list_first_entry(&reaplist, struct nfs4_delegation,
6512					dl_recall_lru);
6513		list_del_init(&dp->dl_recall_lru);
6514		revoke_delegation(dp);
6515	}
6516
6517	spin_lock(&nn->client_lock);
6518	while (!list_empty(&nn->close_lru)) {
6519		oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
6520					oo_close_lru);
6521		if (!state_expired(&lt, oo->oo_time))
 
 
 
6522			break;
 
6523		list_del_init(&oo->oo_close_lru);
6524		stp = oo->oo_last_closed_stid;
6525		oo->oo_last_closed_stid = NULL;
6526		spin_unlock(&nn->client_lock);
6527		nfs4_put_stid(&stp->st_stid);
6528		spin_lock(&nn->client_lock);
6529	}
6530	spin_unlock(&nn->client_lock);
6531
6532	/*
6533	 * It's possible for a client to try and acquire an already held lock
6534	 * that is being held for a long time, and then lose interest in it.
6535	 * So, we clean out any un-revisited request after a lease period
6536	 * under the assumption that the client is no longer interested.
6537	 *
6538	 * RFC5661, sec. 9.6 states that the client must not rely on getting
6539	 * notifications and must continue to poll for locks, even when the
6540	 * server supports them. Thus this shouldn't lead to clients blocking
6541	 * indefinitely once the lock does become free.
6542	 */
6543	BUG_ON(!list_empty(&reaplist));
6544	spin_lock(&nn->blocked_locks_lock);
6545	while (!list_empty(&nn->blocked_locks_lru)) {
6546		nbl = list_first_entry(&nn->blocked_locks_lru,
6547					struct nfsd4_blocked_lock, nbl_lru);
6548		if (!state_expired(&lt, nbl->nbl_time))
 
 
 
6549			break;
 
6550		list_move(&nbl->nbl_lru, &reaplist);
6551		list_del_init(&nbl->nbl_list);
6552	}
6553	spin_unlock(&nn->blocked_locks_lock);
6554
6555	while (!list_empty(&reaplist)) {
6556		nbl = list_first_entry(&reaplist,
6557					struct nfsd4_blocked_lock, nbl_lru);
6558		list_del_init(&nbl->nbl_lru);
 
6559		free_blocked_lock(nbl);
6560	}
6561#ifdef CONFIG_NFSD_V4_2_INTER_SSC
6562	/* service the server-to-server copy delayed unmount list */
6563	nfsd4_ssc_expire_umount(nn);
6564#endif
6565	if (atomic_long_read(&num_delegations) >= max_delegations)
6566		deleg_reaper(nn);
6567out:
6568	return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
6569}
6570
 
6571static void laundromat_main(struct work_struct *);
6572
6573static void
6574laundromat_main(struct work_struct *laundry)
6575{
6576	time64_t t;
6577	struct delayed_work *dwork = to_delayed_work(laundry);
6578	struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6579					   laundromat_work);
6580
6581	t = nfs4_laundromat(nn);
 
6582	queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
6583}
6584
6585static void
6586courtesy_client_reaper(struct nfsd_net *nn)
6587{
6588	struct list_head reaplist;
6589
6590	nfs4_get_courtesy_client_reaplist(nn, &reaplist);
6591	nfs4_process_client_reaplist(&reaplist);
6592}
6593
6594static void
6595deleg_reaper(struct nfsd_net *nn)
6596{
6597	struct list_head *pos, *next;
6598	struct nfs4_client *clp;
6599	struct list_head cblist;
6600
6601	INIT_LIST_HEAD(&cblist);
6602	spin_lock(&nn->client_lock);
6603	list_for_each_safe(pos, next, &nn->client_lru) {
6604		clp = list_entry(pos, struct nfs4_client, cl_lru);
6605		if (clp->cl_state != NFSD4_ACTIVE ||
6606			list_empty(&clp->cl_delegations) ||
6607			atomic_read(&clp->cl_delegs_in_recall) ||
6608			test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) ||
6609			(ktime_get_boottime_seconds() -
6610				clp->cl_ra_time < 5)) {
6611			continue;
6612		}
6613		list_add(&clp->cl_ra_cblist, &cblist);
6614
6615		/* release in nfsd4_cb_recall_any_release */
6616		kref_get(&clp->cl_nfsdfs.cl_ref);
6617		set_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
6618		clp->cl_ra_time = ktime_get_boottime_seconds();
6619	}
6620	spin_unlock(&nn->client_lock);
6621
6622	while (!list_empty(&cblist)) {
6623		clp = list_first_entry(&cblist, struct nfs4_client,
6624					cl_ra_cblist);
6625		list_del_init(&clp->cl_ra_cblist);
6626		clp->cl_ra->ra_keep = 0;
6627		clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG);
6628		clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG) |
6629						BIT(RCA4_TYPE_MASK_WDATA_DLG);
6630		trace_nfsd_cb_recall_any(clp->cl_ra);
6631		nfsd4_run_cb(&clp->cl_ra->ra_cb);
6632	}
6633}
6634
6635static void
6636nfsd4_state_shrinker_worker(struct work_struct *work)
6637{
6638	struct nfsd_net *nn = container_of(work, struct nfsd_net,
6639				nfsd_shrinker_work);
6640
6641	courtesy_client_reaper(nn);
6642	deleg_reaper(nn);
6643}
6644
6645static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
 
6646{
6647	if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
6648		return nfserr_bad_stateid;
6649	return nfs_ok;
6650}
6651
6652static
6653__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
6654{
6655        __be32 status = nfserr_openmode;
6656
6657	/* For lock stateid's, we test the parent open, not the lock: */
6658	if (stp->st_openstp)
6659		stp = stp->st_openstp;
6660	if ((flags & WR_STATE) && !access_permit_write(stp))
6661                goto out;
6662	if ((flags & RD_STATE) && !access_permit_read(stp))
6663                goto out;
6664	status = nfs_ok;
6665out:
6666	return status;
6667}
6668
6669static inline __be32
6670check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
6671{
6672	if (ONE_STATEID(stateid) && (flags & RD_STATE))
6673		return nfs_ok;
6674	else if (opens_in_grace(net)) {
6675		/* Answer in remaining cases depends on existence of
6676		 * conflicting state; so we must wait out the grace period. */
6677		return nfserr_grace;
6678	} else if (flags & WR_STATE)
6679		return nfs4_share_conflict(current_fh,
6680				NFS4_SHARE_DENY_WRITE);
6681	else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
6682		return nfs4_share_conflict(current_fh,
6683				NFS4_SHARE_DENY_READ);
6684}
6685
 
 
 
 
 
 
 
 
 
 
6686static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
6687{
6688	/*
6689	 * When sessions are used the stateid generation number is ignored
6690	 * when it is zero.
6691	 */
6692	if (has_session && in->si_generation == 0)
6693		return nfs_ok;
6694
6695	if (in->si_generation == ref->si_generation)
6696		return nfs_ok;
6697
6698	/* If the client sends us a stateid from the future, it's buggy: */
6699	if (nfsd4_stateid_generation_after(in, ref))
6700		return nfserr_bad_stateid;
6701	/*
6702	 * However, we could see a stateid from the past, even from a
6703	 * non-buggy client.  For example, if the client sends a lock
6704	 * while some IO is outstanding, the lock may bump si_generation
6705	 * while the IO is still in flight.  The client could avoid that
6706	 * situation by waiting for responses on all the IO requests,
6707	 * but better performance may result in retrying IO that
6708	 * receives an old_stateid error if requests are rarely
6709	 * reordered in flight:
6710	 */
6711	return nfserr_old_stateid;
6712}
6713
6714static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
6715{
6716	__be32 ret;
6717
6718	spin_lock(&s->sc_lock);
6719	ret = nfsd4_verify_open_stid(s);
6720	if (ret == nfs_ok)
6721		ret = check_stateid_generation(in, &s->sc_stateid, has_session);
6722	spin_unlock(&s->sc_lock);
6723	if (ret == nfserr_admin_revoked)
6724		nfsd40_drop_revoked_stid(s->sc_client,
6725					&s->sc_stateid);
6726	return ret;
6727}
6728
6729static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
6730{
6731	if (ols->st_stateowner->so_is_open_owner &&
6732	    !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
6733		return nfserr_bad_stateid;
6734	return nfs_ok;
6735}
6736
6737static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
6738{
6739	struct nfs4_stid *s;
6740	__be32 status = nfserr_bad_stateid;
6741
6742	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6743		CLOSE_STATEID(stateid))
6744		return status;
 
 
 
 
 
 
 
 
 
6745	spin_lock(&cl->cl_lock);
6746	s = find_stateid_locked(cl, stateid);
6747	if (!s)
6748		goto out_unlock;
6749	status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
6750	if (status)
6751		goto out_unlock;
6752	status = nfsd4_verify_open_stid(s);
6753	if (status)
6754		goto out_unlock;
6755
6756	switch (s->sc_type) {
6757	case SC_TYPE_DELEG:
6758		status = nfs_ok;
6759		break;
6760	case SC_TYPE_OPEN:
6761	case SC_TYPE_LOCK:
 
 
 
6762		status = nfsd4_check_openowner_confirmed(openlockstateid(s));
6763		break;
6764	default:
6765		printk("unknown stateid type %x\n", s->sc_type);
 
 
 
6766		status = nfserr_bad_stateid;
6767	}
6768out_unlock:
6769	spin_unlock(&cl->cl_lock);
6770	if (status == nfserr_admin_revoked)
6771		nfsd40_drop_revoked_stid(cl, stateid);
6772	return status;
6773}
6774
6775__be32
6776nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
6777		     stateid_t *stateid,
6778		     unsigned short typemask, unsigned short statusmask,
6779		     struct nfs4_stid **s, struct nfsd_net *nn)
6780{
6781	__be32 status;
6782	struct nfs4_stid *stid;
6783	bool return_revoked = false;
6784
6785	/*
6786	 *  only return revoked delegations if explicitly asked.
6787	 *  otherwise we report revoked or bad_stateid status.
6788	 */
6789	if (statusmask & SC_STATUS_REVOKED)
6790		return_revoked = true;
6791	if (typemask & SC_TYPE_DELEG)
6792		/* Always allow REVOKED for DELEG so we can
6793		 * retturn the appropriate error.
6794		 */
6795		statusmask |= SC_STATUS_REVOKED;
6796
6797	statusmask |= SC_STATUS_ADMIN_REVOKED;
6798
6799	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6800		CLOSE_STATEID(stateid))
6801		return nfserr_bad_stateid;
6802	status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
6803	if (status == nfserr_stale_clientid) {
6804		if (cstate->session)
6805			return nfserr_bad_stateid;
6806		return nfserr_stale_stateid;
6807	}
6808	if (status)
6809		return status;
6810	stid = find_stateid_by_type(cstate->clp, stateid, typemask, statusmask);
6811	if (!stid)
 
 
 
 
 
6812		return nfserr_bad_stateid;
6813	if ((stid->sc_status & SC_STATUS_REVOKED) && !return_revoked) {
6814		nfs4_put_stid(stid);
6815		return nfserr_deleg_revoked;
6816	}
6817	if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
6818		nfsd40_drop_revoked_stid(cstate->clp, stateid);
6819		nfs4_put_stid(stid);
6820		return nfserr_admin_revoked;
6821	}
6822	*s = stid;
6823	return nfs_ok;
6824}
6825
6826static struct nfsd_file *
6827nfs4_find_file(struct nfs4_stid *s, int flags)
6828{
6829	struct nfsd_file *ret = NULL;
6830
6831	if (!s || s->sc_status)
6832		return NULL;
6833
6834	switch (s->sc_type) {
6835	case SC_TYPE_DELEG:
6836		spin_lock(&s->sc_file->fi_lock);
6837		ret = nfsd_file_get(s->sc_file->fi_deleg_file);
6838		spin_unlock(&s->sc_file->fi_lock);
6839		break;
6840	case SC_TYPE_OPEN:
6841	case SC_TYPE_LOCK:
6842		if (flags & RD_STATE)
6843			ret = find_readable_file(s->sc_file);
6844		else
6845			ret = find_writeable_file(s->sc_file);
 
6846	}
6847
6848	return ret;
6849}
6850
6851static __be32
6852nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
6853{
6854	__be32 status;
6855
6856	status = nfsd4_check_openowner_confirmed(ols);
6857	if (status)
6858		return status;
6859	return nfs4_check_openmode(ols, flags);
6860}
6861
6862static __be32
6863nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
6864		struct nfsd_file **nfp, int flags)
6865{
6866	int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
6867	struct nfsd_file *nf;
6868	__be32 status;
6869
6870	nf = nfs4_find_file(s, flags);
6871	if (nf) {
6872		status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
6873				acc | NFSD_MAY_OWNER_OVERRIDE);
6874		if (status) {
6875			nfsd_file_put(nf);
6876			goto out;
6877		}
 
 
6878	} else {
6879		status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
6880		if (status)
6881			return status;
6882	}
6883	*nfp = nf;
6884out:
6885	return status;
6886}
6887static void
6888_free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6889{
6890	WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
6891	if (!refcount_dec_and_test(&cps->cp_stateid.cs_count))
6892		return;
6893	list_del(&cps->cp_list);
6894	idr_remove(&nn->s2s_cp_stateids,
6895		   cps->cp_stateid.cs_stid.si_opaque.so_id);
6896	kfree(cps);
6897}
6898/*
6899 * A READ from an inter server to server COPY will have a
6900 * copy stateid. Look up the copy notify stateid from the
6901 * idr structure and take a reference on it.
6902 */
6903__be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6904			  struct nfs4_client *clp,
6905			  struct nfs4_cpntf_state **cps)
6906{
6907	copy_stateid_t *cps_t;
6908	struct nfs4_cpntf_state *state = NULL;
6909
6910	if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
6911		return nfserr_bad_stateid;
6912	spin_lock(&nn->s2s_cp_lock);
6913	cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
6914	if (cps_t) {
6915		state = container_of(cps_t, struct nfs4_cpntf_state,
6916				     cp_stateid);
6917		if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
6918			state = NULL;
6919			goto unlock;
6920		}
6921		if (!clp)
6922			refcount_inc(&state->cp_stateid.cs_count);
6923		else
6924			_free_cpntf_state_locked(nn, state);
6925	}
6926unlock:
6927	spin_unlock(&nn->s2s_cp_lock);
6928	if (!state)
6929		return nfserr_bad_stateid;
6930	if (!clp)
6931		*cps = state;
6932	return 0;
6933}
6934
6935static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6936			       struct nfs4_stid **stid)
6937{
6938	__be32 status;
6939	struct nfs4_cpntf_state *cps = NULL;
6940	struct nfs4_client *found;
6941
6942	status = manage_cpntf_state(nn, st, NULL, &cps);
6943	if (status)
6944		return status;
6945
6946	cps->cpntf_time = ktime_get_boottime_seconds();
6947
6948	status = nfserr_expired;
6949	found = lookup_clientid(&cps->cp_p_clid, true, nn);
6950	if (!found)
6951		goto out;
6952
6953	*stid = find_stateid_by_type(found, &cps->cp_p_stateid,
6954				     SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
6955				     0);
6956	if (*stid)
6957		status = nfs_ok;
6958	else
6959		status = nfserr_bad_stateid;
6960
6961	put_client_renew(found);
6962out:
6963	nfs4_put_cpntf_state(nn, cps);
6964	return status;
6965}
6966
6967void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6968{
6969	spin_lock(&nn->s2s_cp_lock);
6970	_free_cpntf_state_locked(nn, cps);
6971	spin_unlock(&nn->s2s_cp_lock);
6972}
6973
6974/**
6975 * nfs4_preprocess_stateid_op - find and prep stateid for an operation
6976 * @rqstp: incoming request from client
6977 * @cstate: current compound state
6978 * @fhp: filehandle associated with requested stateid
6979 * @stateid: stateid (provided by client)
6980 * @flags: flags describing type of operation to be done
6981 * @nfp: optional nfsd_file return pointer (may be NULL)
6982 * @cstid: optional returned nfs4_stid pointer (may be NULL)
6983 *
6984 * Given info from the client, look up a nfs4_stid for the operation. On
6985 * success, it returns a reference to the nfs4_stid and/or the nfsd_file
6986 * associated with it.
6987 */
6988__be32
6989nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
6990		struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
6991		stateid_t *stateid, int flags, struct nfsd_file **nfp,
6992		struct nfs4_stid **cstid)
6993{
 
6994	struct net *net = SVC_NET(rqstp);
6995	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6996	struct nfs4_stid *s = NULL;
6997	__be32 status;
6998
6999	if (nfp)
7000		*nfp = NULL;
 
 
 
 
 
7001
7002	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
7003		if (cstid)
7004			status = nfserr_bad_stateid;
7005		else
7006			status = check_special_stateids(net, fhp, stateid,
7007									flags);
7008		goto done;
7009	}
7010
7011	status = nfsd4_lookup_stateid(cstate, stateid,
7012				SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
7013				0, &s, nn);
7014	if (status == nfserr_bad_stateid)
7015		status = find_cpntf_state(nn, stateid, &s);
7016	if (status)
7017		return status;
7018	status = nfsd4_stid_check_stateid_generation(stateid, s,
7019			nfsd4_has_session(cstate));
7020	if (status)
7021		goto out;
7022
7023	switch (s->sc_type) {
7024	case SC_TYPE_DELEG:
7025		status = nfs4_check_delegmode(delegstateid(s), flags);
7026		break;
7027	case SC_TYPE_OPEN:
7028	case SC_TYPE_LOCK:
7029		status = nfs4_check_olstateid(openlockstateid(s), flags);
 
 
 
7030		break;
7031	}
7032	if (status)
7033		goto out;
7034	status = nfs4_check_fh(fhp, s);
7035
7036done:
7037	if (status == nfs_ok && nfp)
7038		status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
7039out:
7040	if (s) {
7041		if (!status && cstid)
7042			*cstid = s;
7043		else
7044			nfs4_put_stid(s);
7045	}
7046	return status;
7047}
7048
7049/*
7050 * Test if the stateid is valid
7051 */
7052__be32
7053nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7054		   union nfsd4_op_u *u)
7055{
7056	struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
7057	struct nfsd4_test_stateid_id *stateid;
7058	struct nfs4_client *cl = cstate->clp;
7059
7060	list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
7061		stateid->ts_id_status =
7062			nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
7063
7064	return nfs_ok;
7065}
7066
7067static __be32
7068nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
7069{
7070	struct nfs4_ol_stateid *stp = openlockstateid(s);
7071	__be32 ret;
7072
7073	ret = nfsd4_lock_ol_stateid(stp);
7074	if (ret)
7075		goto out_put_stid;
7076
7077	ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
7078	if (ret)
7079		goto out;
7080
7081	ret = nfserr_locks_held;
7082	if (check_for_locks(stp->st_stid.sc_file,
7083			    lockowner(stp->st_stateowner)))
7084		goto out;
7085
7086	release_lock_stateid(stp);
7087	ret = nfs_ok;
7088
7089out:
7090	mutex_unlock(&stp->st_mutex);
7091out_put_stid:
7092	nfs4_put_stid(s);
7093	return ret;
7094}
7095
7096__be32
7097nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7098		   union nfsd4_op_u *u)
7099{
7100	struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
7101	stateid_t *stateid = &free_stateid->fr_stateid;
7102	struct nfs4_stid *s;
7103	struct nfs4_delegation *dp;
7104	struct nfs4_client *cl = cstate->clp;
7105	__be32 ret = nfserr_bad_stateid;
7106
7107	spin_lock(&cl->cl_lock);
7108	s = find_stateid_locked(cl, stateid);
7109	if (!s || s->sc_status & SC_STATUS_CLOSED)
7110		goto out_unlock;
7111	if (s->sc_status & SC_STATUS_ADMIN_REVOKED) {
7112		nfsd4_drop_revoked_stid(s);
7113		ret = nfs_ok;
7114		goto out;
7115	}
7116	spin_lock(&s->sc_lock);
7117	switch (s->sc_type) {
7118	case SC_TYPE_DELEG:
7119		if (s->sc_status & SC_STATUS_REVOKED) {
7120			spin_unlock(&s->sc_lock);
7121			dp = delegstateid(s);
7122			list_del_init(&dp->dl_recall_lru);
7123			spin_unlock(&cl->cl_lock);
7124			nfs4_put_stid(s);
7125			ret = nfs_ok;
7126			goto out;
7127		}
7128		ret = nfserr_locks_held;
7129		break;
7130	case SC_TYPE_OPEN:
7131		ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
7132		if (ret)
7133			break;
7134		ret = nfserr_locks_held;
7135		break;
7136	case SC_TYPE_LOCK:
7137		spin_unlock(&s->sc_lock);
7138		refcount_inc(&s->sc_count);
7139		spin_unlock(&cl->cl_lock);
7140		ret = nfsd4_free_lock_stateid(stateid, s);
7141		goto out;
 
 
 
 
 
 
 
 
 
7142	}
7143	spin_unlock(&s->sc_lock);
7144out_unlock:
7145	spin_unlock(&cl->cl_lock);
7146out:
7147	return ret;
7148}
7149
7150static inline int
7151setlkflg (int type)
7152{
7153	return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
7154		RD_STATE : WR_STATE;
7155}
7156
7157static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
7158{
7159	struct svc_fh *current_fh = &cstate->current_fh;
7160	struct nfs4_stateowner *sop = stp->st_stateowner;
7161	__be32 status;
7162
7163	status = nfsd4_check_seqid(cstate, sop, seqid);
7164	if (status)
7165		return status;
7166	status = nfsd4_lock_ol_stateid(stp);
7167	if (status != nfs_ok)
7168		return status;
7169	status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
7170	if (status == nfs_ok)
7171		status = nfs4_check_fh(current_fh, &stp->st_stid);
7172	if (status != nfs_ok)
7173		mutex_unlock(&stp->st_mutex);
7174	return status;
7175}
7176
7177/**
7178 * nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op
7179 * @cstate: compund state
7180 * @seqid: seqid (provided by client)
7181 * @stateid: stateid (provided by client)
7182 * @typemask: mask of allowable types for this operation
7183 * @statusmask: mask of allowed states: 0 or STID_CLOSED
7184 * @stpp: return pointer for the stateid found
7185 * @nn: net namespace for request
7186 *
7187 * Given a stateid+seqid from a client, look up an nfs4_ol_stateid and
7188 * return it in @stpp. On a nfs_ok return, the returned stateid will
7189 * have its st_mutex locked.
7190 */
7191static __be32
7192nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
7193			 stateid_t *stateid,
7194			 unsigned short typemask, unsigned short statusmask,
7195			 struct nfs4_ol_stateid **stpp,
7196			 struct nfsd_net *nn)
7197{
7198	__be32 status;
7199	struct nfs4_stid *s;
7200	struct nfs4_ol_stateid *stp = NULL;
7201
7202	trace_nfsd_preprocess(seqid, stateid);
 
7203
7204	*stpp = NULL;
7205	status = nfsd4_lookup_stateid(cstate, stateid,
7206				      typemask, statusmask, &s, nn);
7207	if (status)
7208		return status;
7209	stp = openlockstateid(s);
7210	nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
7211
7212	status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
7213	if (!status)
7214		*stpp = stp;
7215	else
7216		nfs4_put_stid(&stp->st_stid);
7217	return status;
7218}
7219
7220static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
7221						 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
7222{
7223	__be32 status;
7224	struct nfs4_openowner *oo;
7225	struct nfs4_ol_stateid *stp;
7226
7227	status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
7228					  SC_TYPE_OPEN, 0, &stp, nn);
7229	if (status)
7230		return status;
7231	oo = openowner(stp->st_stateowner);
7232	if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
7233		mutex_unlock(&stp->st_mutex);
7234		nfs4_put_stid(&stp->st_stid);
7235		return nfserr_bad_stateid;
7236	}
7237	*stpp = stp;
7238	return nfs_ok;
7239}
7240
7241__be32
7242nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7243		   union nfsd4_op_u *u)
7244{
7245	struct nfsd4_open_confirm *oc = &u->open_confirm;
7246	__be32 status;
7247	struct nfs4_openowner *oo;
7248	struct nfs4_ol_stateid *stp;
7249	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7250
7251	dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
7252			cstate->current_fh.fh_dentry);
7253
7254	status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
7255	if (status)
7256		return status;
7257
7258	status = nfs4_preprocess_seqid_op(cstate,
7259					  oc->oc_seqid, &oc->oc_req_stateid,
7260					  SC_TYPE_OPEN, 0, &stp, nn);
7261	if (status)
7262		goto out;
7263	oo = openowner(stp->st_stateowner);
7264	status = nfserr_bad_stateid;
7265	if (oo->oo_flags & NFS4_OO_CONFIRMED) {
7266		mutex_unlock(&stp->st_mutex);
7267		goto put_stateid;
7268	}
7269	oo->oo_flags |= NFS4_OO_CONFIRMED;
7270	nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
7271	mutex_unlock(&stp->st_mutex);
7272	trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
 
 
7273	nfsd4_client_record_create(oo->oo_owner.so_client);
7274	status = nfs_ok;
7275put_stateid:
7276	nfs4_put_stid(&stp->st_stid);
7277out:
7278	nfsd4_bump_seqid(cstate, status);
7279	return status;
7280}
7281
7282static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
7283{
7284	if (!test_access(access, stp))
7285		return;
7286	nfs4_file_put_access(stp->st_stid.sc_file, access);
7287	clear_access(access, stp);
7288}
7289
7290static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
7291{
7292	switch (to_access) {
7293	case NFS4_SHARE_ACCESS_READ:
7294		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
7295		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7296		break;
7297	case NFS4_SHARE_ACCESS_WRITE:
7298		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
7299		nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7300		break;
7301	case NFS4_SHARE_ACCESS_BOTH:
7302		break;
7303	default:
7304		WARN_ON_ONCE(1);
7305	}
7306}
7307
7308__be32
7309nfsd4_open_downgrade(struct svc_rqst *rqstp,
7310		     struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
7311{
7312	struct nfsd4_open_downgrade *od = &u->open_downgrade;
7313	__be32 status;
7314	struct nfs4_ol_stateid *stp;
7315	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7316
7317	dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", 
7318			cstate->current_fh.fh_dentry);
7319
7320	/* We don't yet support WANT bits: */
7321	if (od->od_deleg_want)
7322		dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
7323			od->od_deleg_want);
7324
7325	status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
7326					&od->od_stateid, &stp, nn);
7327	if (status)
7328		goto out; 
7329	status = nfserr_inval;
7330	if (!test_access(od->od_share_access, stp)) {
7331		dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
7332			stp->st_access_bmap, od->od_share_access);
7333		goto put_stateid;
7334	}
7335	if (!test_deny(od->od_share_deny, stp)) {
7336		dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
7337			stp->st_deny_bmap, od->od_share_deny);
7338		goto put_stateid;
7339	}
7340	nfs4_stateid_downgrade(stp, od->od_share_access);
7341	reset_union_bmap_deny(od->od_share_deny, stp);
7342	nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
7343	status = nfs_ok;
7344put_stateid:
7345	mutex_unlock(&stp->st_mutex);
7346	nfs4_put_stid(&stp->st_stid);
7347out:
7348	nfsd4_bump_seqid(cstate, status);
7349	return status;
7350}
7351
7352static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
7353{
7354	struct nfs4_client *clp = s->st_stid.sc_client;
7355	bool unhashed;
7356	LIST_HEAD(reaplist);
7357	struct nfs4_ol_stateid *stp;
7358
7359	spin_lock(&clp->cl_lock);
7360	unhashed = unhash_open_stateid(s, &reaplist);
7361
7362	if (clp->cl_minorversion) {
7363		if (unhashed)
7364			put_ol_stateid_locked(s, &reaplist);
7365		spin_unlock(&clp->cl_lock);
7366		list_for_each_entry(stp, &reaplist, st_locks)
7367			nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
7368		free_ol_stateid_reaplist(&reaplist);
7369	} else {
7370		spin_unlock(&clp->cl_lock);
7371		free_ol_stateid_reaplist(&reaplist);
7372		if (unhashed)
7373			move_to_close_lru(s, clp->net);
7374	}
7375}
7376
7377/*
7378 * nfs4_unlock_state() called after encode
7379 */
7380__be32
7381nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7382		union nfsd4_op_u *u)
7383{
7384	struct nfsd4_close *close = &u->close;
7385	__be32 status;
7386	struct nfs4_ol_stateid *stp;
7387	struct net *net = SVC_NET(rqstp);
7388	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7389
7390	dprintk("NFSD: nfsd4_close on file %pd\n",
7391			cstate->current_fh.fh_dentry);
7392
7393	status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
7394					  &close->cl_stateid,
7395					  SC_TYPE_OPEN, SC_STATUS_CLOSED,
7396					  &stp, nn);
7397	nfsd4_bump_seqid(cstate, status);
7398	if (status)
7399		goto out;
7400
7401	spin_lock(&stp->st_stid.sc_client->cl_lock);
7402	stp->st_stid.sc_status |= SC_STATUS_CLOSED;
7403	spin_unlock(&stp->st_stid.sc_client->cl_lock);
7404
7405	/*
7406	 * Technically we don't _really_ have to increment or copy it, since
7407	 * it should just be gone after this operation and we clobber the
7408	 * copied value below, but we continue to do so here just to ensure
7409	 * that racing ops see that there was a state change.
7410	 */
7411	nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
7412
7413	nfsd4_close_open_stateid(stp);
7414	mutex_unlock(&stp->st_mutex);
7415
7416	/* v4.1+ suggests that we send a special stateid in here, since the
7417	 * clients should just ignore this anyway. Since this is not useful
7418	 * for v4.0 clients either, we set it to the special close_stateid
7419	 * universally.
7420	 *
7421	 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
7422	 */
7423	memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
7424
7425	/* put reference from nfs4_preprocess_seqid_op */
7426	nfs4_put_stid(&stp->st_stid);
7427out:
7428	return status;
7429}
7430
7431__be32
7432nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7433		  union nfsd4_op_u *u)
7434{
7435	struct nfsd4_delegreturn *dr = &u->delegreturn;
7436	struct nfs4_delegation *dp;
7437	stateid_t *stateid = &dr->dr_stateid;
7438	struct nfs4_stid *s;
7439	__be32 status;
7440	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7441
7442	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7443		return status;
7444
7445	status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG, 0, &s, nn);
7446	if (status)
7447		goto out;
7448	dp = delegstateid(s);
7449	status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
7450	if (status)
7451		goto put_stateid;
7452
7453	trace_nfsd_deleg_return(stateid);
7454	wake_up_var(d_inode(cstate->current_fh.fh_dentry));
7455	destroy_delegation(dp);
7456put_stateid:
7457	nfs4_put_stid(&dp->dl_stid);
7458out:
7459	return status;
7460}
7461
 
 
 
 
 
 
 
 
 
7462/* last octet in a range */
7463static inline u64
7464last_byte_offset(u64 start, u64 len)
7465{
7466	u64 end;
7467
7468	WARN_ON_ONCE(!len);
7469	end = start + len;
7470	return end > start ? end - 1: NFS4_MAX_UINT64;
7471}
7472
7473/*
7474 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
7475 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
7476 * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
7477 * locking, this prevents us from being completely protocol-compliant.  The
7478 * real solution to this problem is to start using unsigned file offsets in
7479 * the VFS, but this is a very deep change!
7480 */
7481static inline void
7482nfs4_transform_lock_offset(struct file_lock *lock)
7483{
7484	if (lock->fl_start < 0)
7485		lock->fl_start = OFFSET_MAX;
7486	if (lock->fl_end < 0)
7487		lock->fl_end = OFFSET_MAX;
7488}
7489
7490static fl_owner_t
7491nfsd4_lm_get_owner(fl_owner_t owner)
7492{
7493	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7494
7495	nfs4_get_stateowner(&lo->lo_owner);
7496	return owner;
7497}
7498
7499static void
7500nfsd4_lm_put_owner(fl_owner_t owner)
7501{
7502	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7503
7504	if (lo)
7505		nfs4_put_stateowner(&lo->lo_owner);
7506}
7507
7508/* return pointer to struct nfs4_client if client is expirable */
7509static bool
7510nfsd4_lm_lock_expirable(struct file_lock *cfl)
7511{
7512	struct nfs4_lockowner *lo = (struct nfs4_lockowner *) cfl->c.flc_owner;
7513	struct nfs4_client *clp = lo->lo_owner.so_client;
7514	struct nfsd_net *nn;
7515
7516	if (try_to_expire_client(clp)) {
7517		nn = net_generic(clp->net, nfsd_net_id);
7518		mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
7519		return true;
7520	}
7521	return false;
7522}
7523
7524/* schedule laundromat to run immediately and wait for it to complete */
7525static void
7526nfsd4_lm_expire_lock(void)
7527{
7528	flush_workqueue(laundry_wq);
7529}
7530
7531static void
7532nfsd4_lm_notify(struct file_lock *fl)
7533{
7534	struct nfs4_lockowner		*lo = (struct nfs4_lockowner *) fl->c.flc_owner;
7535	struct net			*net = lo->lo_owner.so_client->net;
7536	struct nfsd_net			*nn = net_generic(net, nfsd_net_id);
7537	struct nfsd4_blocked_lock	*nbl = container_of(fl,
7538						struct nfsd4_blocked_lock, nbl_lock);
7539	bool queue = false;
7540
7541	/* An empty list means that something else is going to be using it */
7542	spin_lock(&nn->blocked_locks_lock);
7543	if (!list_empty(&nbl->nbl_list)) {
7544		list_del_init(&nbl->nbl_list);
7545		list_del_init(&nbl->nbl_lru);
7546		queue = true;
7547	}
7548	spin_unlock(&nn->blocked_locks_lock);
7549
7550	if (queue) {
7551		trace_nfsd_cb_notify_lock(lo, nbl);
7552		nfsd4_run_cb(&nbl->nbl_cb);
7553	}
7554}
7555
7556static const struct lock_manager_operations nfsd_posix_mng_ops  = {
7557	.lm_mod_owner = THIS_MODULE,
7558	.lm_notify = nfsd4_lm_notify,
7559	.lm_get_owner = nfsd4_lm_get_owner,
7560	.lm_put_owner = nfsd4_lm_put_owner,
7561	.lm_lock_expirable = nfsd4_lm_lock_expirable,
7562	.lm_expire_lock = nfsd4_lm_expire_lock,
7563};
7564
7565static inline void
7566nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
7567{
7568	struct nfs4_lockowner *lo;
7569
7570	if (fl->fl_lmops == &nfsd_posix_mng_ops) {
7571		lo = (struct nfs4_lockowner *) fl->c.flc_owner;
7572		xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
7573						GFP_KERNEL);
7574		if (!deny->ld_owner.data)
7575			/* We just don't care that much */
7576			goto nevermind;
 
7577		deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
7578	} else {
7579nevermind:
7580		deny->ld_owner.len = 0;
7581		deny->ld_owner.data = NULL;
7582		deny->ld_clientid.cl_boot = 0;
7583		deny->ld_clientid.cl_id = 0;
7584	}
7585	deny->ld_start = fl->fl_start;
7586	deny->ld_length = NFS4_MAX_UINT64;
7587	if (fl->fl_end != NFS4_MAX_UINT64)
7588		deny->ld_length = fl->fl_end - fl->fl_start + 1;        
7589	deny->ld_type = NFS4_READ_LT;
7590	if (fl->c.flc_type != F_RDLCK)
7591		deny->ld_type = NFS4_WRITE_LT;
7592}
7593
7594static struct nfs4_lockowner *
7595find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
7596{
7597	unsigned int strhashval = ownerstr_hashval(owner);
7598	struct nfs4_stateowner *so;
7599
7600	lockdep_assert_held(&clp->cl_lock);
7601
7602	list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
7603			    so_strhash) {
7604		if (so->so_is_open_owner)
7605			continue;
7606		if (same_owner_str(so, owner))
7607			return lockowner(nfs4_get_stateowner(so));
7608	}
7609	return NULL;
7610}
7611
7612static struct nfs4_lockowner *
7613find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
7614{
7615	struct nfs4_lockowner *lo;
7616
7617	spin_lock(&clp->cl_lock);
7618	lo = find_lockowner_str_locked(clp, owner);
7619	spin_unlock(&clp->cl_lock);
7620	return lo;
7621}
7622
7623static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
7624{
7625	unhash_lockowner_locked(lockowner(sop));
7626}
7627
7628static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
7629{
7630	struct nfs4_lockowner *lo = lockowner(sop);
7631
7632	kmem_cache_free(lockowner_slab, lo);
7633}
7634
7635static const struct nfs4_stateowner_operations lockowner_ops = {
7636	.so_unhash =	nfs4_unhash_lockowner,
7637	.so_free =	nfs4_free_lockowner,
7638};
7639
7640/*
7641 * Alloc a lock owner structure.
7642 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
7643 * occurred. 
7644 *
7645 * strhashval = ownerstr_hashval
7646 */
7647static struct nfs4_lockowner *
7648alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
7649			   struct nfs4_ol_stateid *open_stp,
7650			   struct nfsd4_lock *lock)
7651{
7652	struct nfs4_lockowner *lo, *ret;
7653
7654	lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
7655	if (!lo)
7656		return NULL;
7657	INIT_LIST_HEAD(&lo->lo_blocked);
7658	INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
7659	lo->lo_owner.so_is_open_owner = 0;
7660	lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
7661	lo->lo_owner.so_ops = &lockowner_ops;
7662	spin_lock(&clp->cl_lock);
7663	ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
7664	if (ret == NULL) {
7665		list_add(&lo->lo_owner.so_strhash,
7666			 &clp->cl_ownerstr_hashtbl[strhashval]);
7667		ret = lo;
7668	} else
7669		nfs4_free_stateowner(&lo->lo_owner);
7670
7671	spin_unlock(&clp->cl_lock);
7672	return ret;
7673}
7674
7675static struct nfs4_ol_stateid *
7676find_lock_stateid(const struct nfs4_lockowner *lo,
7677		  const struct nfs4_ol_stateid *ost)
7678{
7679	struct nfs4_ol_stateid *lst;
 
7680
7681	lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
7682
7683	/* If ost is not hashed, ost->st_locks will not be valid */
7684	if (!nfs4_ol_stateid_unhashed(ost))
7685		list_for_each_entry(lst, &ost->st_locks, st_locks) {
7686			if (lst->st_stateowner == &lo->lo_owner) {
7687				refcount_inc(&lst->st_stid.sc_count);
7688				return lst;
7689			}
7690		}
 
7691	return NULL;
7692}
7693
7694static struct nfs4_ol_stateid *
7695init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
7696		  struct nfs4_file *fp, struct inode *inode,
7697		  struct nfs4_ol_stateid *open_stp)
7698{
7699	struct nfs4_client *clp = lo->lo_owner.so_client;
7700	struct nfs4_ol_stateid *retstp;
7701
7702	mutex_init(&stp->st_mutex);
7703	mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
7704retry:
7705	spin_lock(&clp->cl_lock);
7706	if (nfs4_ol_stateid_unhashed(open_stp))
7707		goto out_close;
7708	retstp = find_lock_stateid(lo, open_stp);
7709	if (retstp)
7710		goto out_found;
 
7711	refcount_inc(&stp->st_stid.sc_count);
7712	stp->st_stid.sc_type = SC_TYPE_LOCK;
7713	stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
7714	get_nfs4_file(fp);
7715	stp->st_stid.sc_file = fp;
7716	stp->st_access_bmap = 0;
7717	stp->st_deny_bmap = open_stp->st_deny_bmap;
7718	stp->st_openstp = open_stp;
7719	spin_lock(&fp->fi_lock);
7720	list_add(&stp->st_locks, &open_stp->st_locks);
7721	list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
7722	list_add(&stp->st_perfile, &fp->fi_stateids);
 
7723	spin_unlock(&fp->fi_lock);
7724	spin_unlock(&clp->cl_lock);
7725	return stp;
7726out_found:
7727	spin_unlock(&clp->cl_lock);
7728	if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
7729		nfs4_put_stid(&retstp->st_stid);
7730		goto retry;
 
 
7731	}
7732	/* To keep mutex tracking happy */
7733	mutex_unlock(&stp->st_mutex);
7734	return retstp;
7735out_close:
7736	spin_unlock(&clp->cl_lock);
7737	mutex_unlock(&stp->st_mutex);
7738	return NULL;
7739}
7740
7741static struct nfs4_ol_stateid *
7742find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
7743			    struct inode *inode, struct nfs4_ol_stateid *ost,
7744			    bool *new)
7745{
7746	struct nfs4_stid *ns = NULL;
7747	struct nfs4_ol_stateid *lst;
7748	struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7749	struct nfs4_client *clp = oo->oo_owner.so_client;
7750
7751	*new = false;
7752	spin_lock(&clp->cl_lock);
7753	lst = find_lock_stateid(lo, ost);
7754	spin_unlock(&clp->cl_lock);
7755	if (lst != NULL) {
7756		if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
7757			goto out;
7758		nfs4_put_stid(&lst->st_stid);
7759	}
7760	ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
7761	if (ns == NULL)
7762		return NULL;
7763
7764	lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
7765	if (lst == openlockstateid(ns))
7766		*new = true;
7767	else
7768		nfs4_put_stid(ns);
7769out:
7770	return lst;
7771}
7772
7773static int
7774check_lock_length(u64 offset, u64 length)
7775{
7776	return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
7777		(length > ~offset)));
7778}
7779
7780static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
7781{
7782	struct nfs4_file *fp = lock_stp->st_stid.sc_file;
7783
7784	lockdep_assert_held(&fp->fi_lock);
7785
7786	if (test_access(access, lock_stp))
7787		return;
7788	__nfs4_file_get_access(fp, access);
7789	set_access(access, lock_stp);
7790}
7791
7792static __be32
7793lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
7794			    struct nfs4_ol_stateid *ost,
7795			    struct nfsd4_lock *lock,
7796			    struct nfs4_ol_stateid **plst, bool *new)
7797{
7798	__be32 status;
7799	struct nfs4_file *fi = ost->st_stid.sc_file;
7800	struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7801	struct nfs4_client *cl = oo->oo_owner.so_client;
7802	struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
7803	struct nfs4_lockowner *lo;
7804	struct nfs4_ol_stateid *lst;
7805	unsigned int strhashval;
7806
7807	lo = find_lockowner_str(cl, &lock->lk_new_owner);
7808	if (!lo) {
7809		strhashval = ownerstr_hashval(&lock->lk_new_owner);
7810		lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
7811		if (lo == NULL)
7812			return nfserr_jukebox;
7813	} else {
7814		/* with an existing lockowner, seqids must be the same */
7815		status = nfserr_bad_seqid;
7816		if (!cstate->minorversion &&
7817		    lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
7818			goto out;
7819	}
7820
7821	lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
7822	if (lst == NULL) {
7823		status = nfserr_jukebox;
7824		goto out;
7825	}
7826
7827	status = nfs_ok;
7828	*plst = lst;
7829out:
7830	nfs4_put_stateowner(&lo->lo_owner);
7831	return status;
7832}
7833
7834/*
7835 *  LOCK operation 
7836 */
7837__be32
7838nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7839	   union nfsd4_op_u *u)
7840{
7841	struct nfsd4_lock *lock = &u->lock;
7842	struct nfs4_openowner *open_sop = NULL;
7843	struct nfs4_lockowner *lock_sop = NULL;
7844	struct nfs4_ol_stateid *lock_stp = NULL;
7845	struct nfs4_ol_stateid *open_stp = NULL;
7846	struct nfs4_file *fp;
7847	struct nfsd_file *nf = NULL;
7848	struct nfsd4_blocked_lock *nbl = NULL;
7849	struct file_lock *file_lock = NULL;
7850	struct file_lock *conflock = NULL;
7851	struct super_block *sb;
7852	__be32 status = 0;
7853	int lkflg;
7854	int err;
7855	bool new = false;
7856	unsigned char type;
7857	unsigned int flags = FL_POSIX;
7858	struct net *net = SVC_NET(rqstp);
7859	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7860
7861	dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
7862		(long long) lock->lk_offset,
7863		(long long) lock->lk_length);
7864
7865	if (check_lock_length(lock->lk_offset, lock->lk_length))
7866		 return nfserr_inval;
7867
7868	if ((status = fh_verify(rqstp, &cstate->current_fh,
7869				S_IFREG, NFSD_MAY_LOCK))) {
7870		dprintk("NFSD: nfsd4_lock: permission denied!\n");
7871		return status;
7872	}
7873	sb = cstate->current_fh.fh_dentry->d_sb;
7874
7875	if (lock->lk_is_new) {
7876		if (nfsd4_has_session(cstate))
7877			/* See rfc 5661 18.10.3: given clientid is ignored: */
7878			memcpy(&lock->lk_new_clientid,
7879				&cstate->clp->cl_clientid,
7880				sizeof(clientid_t));
7881
 
 
 
 
7882		/* validate and update open stateid and open seqid */
7883		status = nfs4_preprocess_confirmed_seqid_op(cstate,
7884				        lock->lk_new_open_seqid,
7885		                        &lock->lk_new_open_stateid,
7886					&open_stp, nn);
7887		if (status)
7888			goto out;
7889		mutex_unlock(&open_stp->st_mutex);
7890		open_sop = openowner(open_stp->st_stateowner);
7891		status = nfserr_bad_stateid;
7892		if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
7893						&lock->lk_new_clientid))
7894			goto out;
7895		status = lookup_or_create_lock_state(cstate, open_stp, lock,
7896							&lock_stp, &new);
7897	} else {
7898		status = nfs4_preprocess_seqid_op(cstate,
7899						  lock->lk_old_lock_seqid,
7900						  &lock->lk_old_lock_stateid,
7901						  SC_TYPE_LOCK, 0, &lock_stp,
7902						  nn);
7903	}
7904	if (status)
7905		goto out;
7906	lock_sop = lockowner(lock_stp->st_stateowner);
7907
7908	lkflg = setlkflg(lock->lk_type);
7909	status = nfs4_check_openmode(lock_stp, lkflg);
7910	if (status)
7911		goto out;
7912
7913	status = nfserr_grace;
7914	if (locks_in_grace(net) && !lock->lk_reclaim)
7915		goto out;
7916	status = nfserr_no_grace;
7917	if (!locks_in_grace(net) && lock->lk_reclaim)
7918		goto out;
7919
7920	if (lock->lk_reclaim)
7921		flags |= FL_RECLAIM;
7922
7923	fp = lock_stp->st_stid.sc_file;
7924	switch (lock->lk_type) {
7925		case NFS4_READW_LT:
7926			if (nfsd4_has_session(cstate) ||
7927			    exportfs_lock_op_is_async(sb->s_export_op))
7928				flags |= FL_SLEEP;
7929			fallthrough;
7930		case NFS4_READ_LT:
7931			spin_lock(&fp->fi_lock);
7932			nf = find_readable_file_locked(fp);
7933			if (nf)
7934				get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
7935			spin_unlock(&fp->fi_lock);
7936			type = F_RDLCK;
7937			break;
7938		case NFS4_WRITEW_LT:
7939			if (nfsd4_has_session(cstate) ||
7940			    exportfs_lock_op_is_async(sb->s_export_op))
7941				flags |= FL_SLEEP;
7942			fallthrough;
7943		case NFS4_WRITE_LT:
7944			spin_lock(&fp->fi_lock);
7945			nf = find_writeable_file_locked(fp);
7946			if (nf)
7947				get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
7948			spin_unlock(&fp->fi_lock);
7949			type = F_WRLCK;
7950			break;
7951		default:
7952			status = nfserr_inval;
7953		goto out;
7954	}
7955
7956	if (!nf) {
7957		status = nfserr_openmode;
7958		goto out;
7959	}
7960
7961	/*
7962	 * Most filesystems with their own ->lock operations will block
7963	 * the nfsd thread waiting to acquire the lock.  That leads to
7964	 * deadlocks (we don't want every nfsd thread tied up waiting
7965	 * for file locks), so don't attempt blocking lock notifications
7966	 * on those filesystems:
7967	 */
7968	if (!exportfs_lock_op_is_async(sb->s_export_op))
7969		flags &= ~FL_SLEEP;
7970
7971	nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
7972	if (!nbl) {
7973		dprintk("NFSD: %s: unable to allocate block!\n", __func__);
7974		status = nfserr_jukebox;
7975		goto out;
7976	}
7977
7978	file_lock = &nbl->nbl_lock;
7979	file_lock->c.flc_type = type;
7980	file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
7981	file_lock->c.flc_pid = current->tgid;
7982	file_lock->c.flc_file = nf->nf_file;
7983	file_lock->c.flc_flags = flags;
7984	file_lock->fl_lmops = &nfsd_posix_mng_ops;
7985	file_lock->fl_start = lock->lk_offset;
7986	file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
7987	nfs4_transform_lock_offset(file_lock);
7988
7989	conflock = locks_alloc_lock();
7990	if (!conflock) {
7991		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7992		status = nfserr_jukebox;
7993		goto out;
7994	}
7995
7996	if (flags & FL_SLEEP) {
7997		nbl->nbl_time = ktime_get_boottime_seconds();
7998		spin_lock(&nn->blocked_locks_lock);
7999		list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
8000		list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
8001		kref_get(&nbl->nbl_kref);
8002		spin_unlock(&nn->blocked_locks_lock);
8003	}
8004
8005	err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
8006	switch (err) {
8007	case 0: /* success! */
8008		nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
8009		status = 0;
8010		if (lock->lk_reclaim)
8011			nn->somebody_reclaimed = true;
8012		break;
8013	case FILE_LOCK_DEFERRED:
8014		kref_put(&nbl->nbl_kref, free_nbl);
8015		nbl = NULL;
8016		fallthrough;
8017	case -EAGAIN:		/* conflock holds conflicting lock */
8018		status = nfserr_denied;
8019		dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
8020		nfs4_set_lock_denied(conflock, &lock->lk_denied);
8021		break;
8022	case -EDEADLK:
8023		status = nfserr_deadlock;
8024		break;
8025	default:
8026		dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
8027		status = nfserrno(err);
8028		break;
8029	}
8030out:
8031	if (nbl) {
8032		/* dequeue it if we queued it before */
8033		if (flags & FL_SLEEP) {
8034			spin_lock(&nn->blocked_locks_lock);
8035			if (!list_empty(&nbl->nbl_list) &&
8036			    !list_empty(&nbl->nbl_lru)) {
8037				list_del_init(&nbl->nbl_list);
8038				list_del_init(&nbl->nbl_lru);
8039				kref_put(&nbl->nbl_kref, free_nbl);
8040			}
8041			/* nbl can use one of lists to be linked to reaplist */
8042			spin_unlock(&nn->blocked_locks_lock);
8043		}
8044		free_blocked_lock(nbl);
8045	}
8046	if (nf)
8047		nfsd_file_put(nf);
8048	if (lock_stp) {
8049		/* Bump seqid manually if the 4.0 replay owner is openowner */
8050		if (cstate->replay_owner &&
8051		    cstate->replay_owner != &lock_sop->lo_owner &&
8052		    seqid_mutating_err(ntohl(status)))
8053			lock_sop->lo_owner.so_seqid++;
8054
8055		/*
8056		 * If this is a new, never-before-used stateid, and we are
8057		 * returning an error, then just go ahead and release it.
8058		 */
8059		if (status && new)
8060			release_lock_stateid(lock_stp);
8061
8062		mutex_unlock(&lock_stp->st_mutex);
8063
8064		nfs4_put_stid(&lock_stp->st_stid);
8065	}
8066	if (open_stp)
8067		nfs4_put_stid(&open_stp->st_stid);
8068	nfsd4_bump_seqid(cstate, status);
8069	if (conflock)
8070		locks_free_lock(conflock);
8071	return status;
8072}
8073
8074void nfsd4_lock_release(union nfsd4_op_u *u)
8075{
8076	struct nfsd4_lock *lock = &u->lock;
8077	struct nfsd4_lock_denied *deny = &lock->lk_denied;
8078
8079	kfree(deny->ld_owner.data);
8080}
8081
8082/*
8083 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
8084 * so we do a temporary open here just to get an open file to pass to
8085 * vfs_test_lock.
 
8086 */
8087static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
8088{
8089	struct nfsd_file *nf;
8090	struct inode *inode;
8091	__be32 err;
8092
8093	err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
8094	if (err)
8095		return err;
8096	inode = fhp->fh_dentry->d_inode;
8097	inode_lock(inode); /* to block new leases till after test_lock: */
8098	err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
8099	if (err)
8100		goto out;
8101	lock->c.flc_file = nf->nf_file;
8102	err = nfserrno(vfs_test_lock(nf->nf_file, lock));
8103	lock->c.flc_file = NULL;
8104out:
8105	inode_unlock(inode);
8106	nfsd_file_put(nf);
8107	return err;
8108}
8109
8110/*
8111 * LOCKT operation
8112 */
8113__be32
8114nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8115	    union nfsd4_op_u *u)
8116{
8117	struct nfsd4_lockt *lockt = &u->lockt;
8118	struct file_lock *file_lock = NULL;
8119	struct nfs4_lockowner *lo = NULL;
8120	__be32 status;
8121	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8122
8123	if (locks_in_grace(SVC_NET(rqstp)))
8124		return nfserr_grace;
8125
8126	if (check_lock_length(lockt->lt_offset, lockt->lt_length))
8127		 return nfserr_inval;
8128
8129	if (!nfsd4_has_session(cstate)) {
8130		status = set_client(&lockt->lt_clientid, cstate, nn);
8131		if (status)
8132			goto out;
8133	}
8134
8135	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
8136		goto out;
8137
8138	file_lock = locks_alloc_lock();
8139	if (!file_lock) {
8140		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8141		status = nfserr_jukebox;
8142		goto out;
8143	}
8144
8145	switch (lockt->lt_type) {
8146		case NFS4_READ_LT:
8147		case NFS4_READW_LT:
8148			file_lock->c.flc_type = F_RDLCK;
8149			break;
8150		case NFS4_WRITE_LT:
8151		case NFS4_WRITEW_LT:
8152			file_lock->c.flc_type = F_WRLCK;
8153			break;
8154		default:
8155			dprintk("NFSD: nfs4_lockt: bad lock type!\n");
8156			status = nfserr_inval;
8157			goto out;
8158	}
8159
8160	lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
8161	if (lo)
8162		file_lock->c.flc_owner = (fl_owner_t)lo;
8163	file_lock->c.flc_pid = current->tgid;
8164	file_lock->c.flc_flags = FL_POSIX;
8165
8166	file_lock->fl_start = lockt->lt_offset;
8167	file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
8168
8169	nfs4_transform_lock_offset(file_lock);
8170
8171	status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
8172	if (status)
8173		goto out;
8174
8175	if (file_lock->c.flc_type != F_UNLCK) {
8176		status = nfserr_denied;
8177		nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
8178	}
8179out:
8180	if (lo)
8181		nfs4_put_stateowner(&lo->lo_owner);
8182	if (file_lock)
8183		locks_free_lock(file_lock);
8184	return status;
8185}
8186
8187void nfsd4_lockt_release(union nfsd4_op_u *u)
8188{
8189	struct nfsd4_lockt *lockt = &u->lockt;
8190	struct nfsd4_lock_denied *deny = &lockt->lt_denied;
8191
8192	kfree(deny->ld_owner.data);
8193}
8194
8195__be32
8196nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8197	    union nfsd4_op_u *u)
8198{
8199	struct nfsd4_locku *locku = &u->locku;
8200	struct nfs4_ol_stateid *stp;
8201	struct nfsd_file *nf = NULL;
8202	struct file_lock *file_lock = NULL;
8203	__be32 status;
8204	int err;
8205	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8206
8207	dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
8208		(long long) locku->lu_offset,
8209		(long long) locku->lu_length);
8210
8211	if (check_lock_length(locku->lu_offset, locku->lu_length))
8212		 return nfserr_inval;
8213
8214	status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
8215					  &locku->lu_stateid, SC_TYPE_LOCK, 0,
8216					  &stp, nn);
8217	if (status)
8218		goto out;
8219	nf = find_any_file(stp->st_stid.sc_file);
8220	if (!nf) {
8221		status = nfserr_lock_range;
8222		goto put_stateid;
8223	}
8224	file_lock = locks_alloc_lock();
8225	if (!file_lock) {
8226		dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8227		status = nfserr_jukebox;
8228		goto put_file;
8229	}
8230
8231	file_lock->c.flc_type = F_UNLCK;
8232	file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
8233	file_lock->c.flc_pid = current->tgid;
8234	file_lock->c.flc_file = nf->nf_file;
8235	file_lock->c.flc_flags = FL_POSIX;
8236	file_lock->fl_lmops = &nfsd_posix_mng_ops;
8237	file_lock->fl_start = locku->lu_offset;
8238
8239	file_lock->fl_end = last_byte_offset(locku->lu_offset,
8240						locku->lu_length);
8241	nfs4_transform_lock_offset(file_lock);
8242
8243	err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
8244	if (err) {
8245		dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
8246		goto out_nfserr;
8247	}
8248	nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
8249put_file:
8250	nfsd_file_put(nf);
8251put_stateid:
8252	mutex_unlock(&stp->st_mutex);
8253	nfs4_put_stid(&stp->st_stid);
8254out:
8255	nfsd4_bump_seqid(cstate, status);
8256	if (file_lock)
8257		locks_free_lock(file_lock);
8258	return status;
8259
8260out_nfserr:
8261	status = nfserrno(err);
8262	goto put_file;
8263}
8264
8265/*
8266 * returns
8267 * 	true:  locks held by lockowner
8268 * 	false: no locks held by lockowner
8269 */
8270static bool
8271check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
8272{
8273	struct file_lock *fl;
8274	int status = false;
8275	struct nfsd_file *nf;
8276	struct inode *inode;
8277	struct file_lock_context *flctx;
8278
8279	spin_lock(&fp->fi_lock);
8280	nf = find_any_file_locked(fp);
8281	if (!nf) {
8282		/* Any valid lock stateid should have some sort of access */
8283		WARN_ON_ONCE(1);
8284		goto out;
8285	}
8286
8287	inode = file_inode(nf->nf_file);
8288	flctx = locks_inode_context(inode);
8289
8290	if (flctx && !list_empty_careful(&flctx->flc_posix)) {
8291		spin_lock(&flctx->flc_lock);
8292		for_each_file_lock(fl, &flctx->flc_posix) {
8293			if (fl->c.flc_owner == (fl_owner_t)lowner) {
8294				status = true;
8295				break;
8296			}
8297		}
8298		spin_unlock(&flctx->flc_lock);
8299	}
8300out:
8301	spin_unlock(&fp->fi_lock);
8302	return status;
8303}
8304
8305/**
8306 * nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
8307 * @rqstp: RPC transaction
8308 * @cstate: NFSv4 COMPOUND state
8309 * @u: RELEASE_LOCKOWNER arguments
8310 *
8311 * Check if theree are any locks still held and if not - free the lockowner
8312 * and any lock state that is owned.
8313 *
8314 * Return values:
8315 *   %nfs_ok: lockowner released or not found
8316 *   %nfserr_locks_held: lockowner still in use
8317 *   %nfserr_stale_clientid: clientid no longer active
8318 *   %nfserr_expired: clientid not recognized
8319 */
8320__be32
8321nfsd4_release_lockowner(struct svc_rqst *rqstp,
8322			struct nfsd4_compound_state *cstate,
8323			union nfsd4_op_u *u)
8324{
8325	struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
8326	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8327	clientid_t *clid = &rlockowner->rl_clientid;
 
 
8328	struct nfs4_ol_stateid *stp;
8329	struct nfs4_lockowner *lo;
8330	struct nfs4_client *clp;
8331	LIST_HEAD(reaplist);
8332	__be32 status;
 
 
 
8333
8334	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
8335		clid->cl_boot, clid->cl_id);
8336
8337	status = set_client(clid, cstate, nn);
8338	if (status)
8339		return status;
8340	clp = cstate->clp;
8341
 
 
8342	spin_lock(&clp->cl_lock);
8343	lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8344	if (!lo) {
8345		spin_unlock(&clp->cl_lock);
8346		return nfs_ok;
8347	}
8348
8349	list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
8350		if (check_for_locks(stp->st_stid.sc_file, lo)) {
8351			spin_unlock(&clp->cl_lock);
8352			nfs4_put_stateowner(&lo->lo_owner);
8353			return nfserr_locks_held;
8354		}
8355	}
8356	unhash_lockowner_locked(lo);
8357	while (!list_empty(&lo->lo_owner.so_stateids)) {
8358		stp = list_first_entry(&lo->lo_owner.so_stateids,
8359				       struct nfs4_ol_stateid,
8360				       st_perstateowner);
8361		unhash_lock_stateid(stp);
8362		put_ol_stateid_locked(stp, &reaplist);
8363	}
8364	spin_unlock(&clp->cl_lock);
8365
8366	free_ol_stateid_reaplist(&reaplist);
8367	remove_blocked_locks(lo);
8368	nfs4_put_stateowner(&lo->lo_owner);
8369	return nfs_ok;
 
8370}
8371
8372static inline struct nfs4_client_reclaim *
8373alloc_reclaim(void)
8374{
8375	return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
8376}
8377
8378bool
8379nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
8380{
8381	struct nfs4_client_reclaim *crp;
8382
8383	crp = nfsd4_find_reclaim_client(name, nn);
8384	return (crp && crp->cr_clp);
8385}
8386
8387/*
8388 * failure => all reset bets are off, nfserr_no_grace...
8389 *
8390 * The caller is responsible for freeing name.data if NULL is returned (it
8391 * will be freed in nfs4_remove_reclaim_record in the normal case).
8392 */
8393struct nfs4_client_reclaim *
8394nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
8395		struct nfsd_net *nn)
8396{
8397	unsigned int strhashval;
8398	struct nfs4_client_reclaim *crp;
8399
 
8400	crp = alloc_reclaim();
8401	if (crp) {
8402		strhashval = clientstr_hashval(name);
8403		INIT_LIST_HEAD(&crp->cr_strhash);
8404		list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
8405		crp->cr_name.data = name.data;
8406		crp->cr_name.len = name.len;
8407		crp->cr_princhash.data = princhash.data;
8408		crp->cr_princhash.len = princhash.len;
8409		crp->cr_clp = NULL;
8410		nn->reclaim_str_hashtbl_size++;
8411	}
8412	return crp;
8413}
8414
8415void
8416nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
8417{
8418	list_del(&crp->cr_strhash);
8419	kfree(crp->cr_name.data);
8420	kfree(crp->cr_princhash.data);
8421	kfree(crp);
8422	nn->reclaim_str_hashtbl_size--;
8423}
8424
8425void
8426nfs4_release_reclaim(struct nfsd_net *nn)
8427{
8428	struct nfs4_client_reclaim *crp = NULL;
8429	int i;
8430
8431	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8432		while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
8433			crp = list_entry(nn->reclaim_str_hashtbl[i].next,
8434			                struct nfs4_client_reclaim, cr_strhash);
8435			nfs4_remove_reclaim_record(crp, nn);
8436		}
8437	}
8438	WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
8439}
8440
8441/*
8442 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
8443struct nfs4_client_reclaim *
8444nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
8445{
8446	unsigned int strhashval;
8447	struct nfs4_client_reclaim *crp = NULL;
8448
8449	strhashval = clientstr_hashval(name);
 
 
8450	list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
8451		if (compare_blob(&crp->cr_name, &name) == 0) {
8452			return crp;
8453		}
8454	}
8455	return NULL;
8456}
8457
 
 
 
8458__be32
8459nfs4_check_open_reclaim(struct nfs4_client *clp)
 
 
8460{
8461	if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
 
 
 
 
 
 
 
8462		return nfserr_no_grace;
8463
8464	if (nfsd4_client_record_check(clp))
8465		return nfserr_reclaim_bad;
8466
8467	return nfs_ok;
8468}
8469
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8470/*
8471 * Since the lifetime of a delegation isn't limited to that of an open, a
8472 * client may quite reasonably hang on to a delegation as long as it has
8473 * the inode cached.  This becomes an obvious problem the first time a
8474 * client's inode cache approaches the size of the server's total memory.
8475 *
8476 * For now we avoid this problem by imposing a hard limit on the number
8477 * of delegations, which varies according to the server's memory size.
8478 */
8479static void
8480set_max_delegations(void)
8481{
8482	/*
8483	 * Allow at most 4 delegations per megabyte of RAM.  Quick
8484	 * estimates suggest that in the worst case (where every delegation
8485	 * is for a different inode), a delegation could take about 1.5K,
8486	 * giving a worst case usage of about 6% of memory.
8487	 */
8488	max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
8489}
8490
8491static int nfs4_state_create_net(struct net *net)
8492{
8493	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8494	int i;
8495
8496	nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8497					    sizeof(struct list_head),
8498					    GFP_KERNEL);
8499	if (!nn->conf_id_hashtbl)
8500		goto err;
8501	nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8502					      sizeof(struct list_head),
8503					      GFP_KERNEL);
8504	if (!nn->unconf_id_hashtbl)
8505		goto err_unconf_id;
8506	nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
8507					      sizeof(struct list_head),
8508					      GFP_KERNEL);
8509	if (!nn->sessionid_hashtbl)
8510		goto err_sessionid;
8511
8512	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8513		INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
8514		INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
8515	}
8516	for (i = 0; i < SESSION_HASH_SIZE; i++)
8517		INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
8518	nn->conf_name_tree = RB_ROOT;
8519	nn->unconf_name_tree = RB_ROOT;
8520	nn->boot_time = ktime_get_real_seconds();
8521	nn->grace_ended = false;
8522	nn->nfsd4_manager.block_opens = true;
8523	INIT_LIST_HEAD(&nn->nfsd4_manager.list);
8524	INIT_LIST_HEAD(&nn->client_lru);
8525	INIT_LIST_HEAD(&nn->close_lru);
8526	INIT_LIST_HEAD(&nn->del_recall_lru);
8527	spin_lock_init(&nn->client_lock);
8528	spin_lock_init(&nn->s2s_cp_lock);
8529	idr_init(&nn->s2s_cp_stateids);
8530
8531	spin_lock_init(&nn->blocked_locks_lock);
8532	INIT_LIST_HEAD(&nn->blocked_locks_lru);
8533
8534	INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
8535	INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
8536	get_net(net);
8537
8538	nn->nfsd_client_shrinker = shrinker_alloc(0, "nfsd-client");
8539	if (!nn->nfsd_client_shrinker)
8540		goto err_shrinker;
8541
8542	nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan;
8543	nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count;
8544	nn->nfsd_client_shrinker->private_data = nn;
8545
8546	shrinker_register(nn->nfsd_client_shrinker);
8547
8548	return 0;
8549
8550err_shrinker:
8551	put_net(net);
8552	kfree(nn->sessionid_hashtbl);
8553err_sessionid:
8554	kfree(nn->unconf_id_hashtbl);
8555err_unconf_id:
8556	kfree(nn->conf_id_hashtbl);
8557err:
8558	return -ENOMEM;
8559}
8560
8561static void
8562nfs4_state_destroy_net(struct net *net)
8563{
8564	int i;
8565	struct nfs4_client *clp = NULL;
8566	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8567
8568	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8569		while (!list_empty(&nn->conf_id_hashtbl[i])) {
8570			clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8571			destroy_client(clp);
8572		}
8573	}
8574
8575	WARN_ON(!list_empty(&nn->blocked_locks_lru));
8576
8577	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8578		while (!list_empty(&nn->unconf_id_hashtbl[i])) {
8579			clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8580			destroy_client(clp);
8581		}
8582	}
8583
8584	kfree(nn->sessionid_hashtbl);
8585	kfree(nn->unconf_id_hashtbl);
8586	kfree(nn->conf_id_hashtbl);
8587	put_net(net);
8588}
8589
8590int
8591nfs4_state_start_net(struct net *net)
8592{
8593	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8594	int ret;
8595
8596	ret = nfs4_state_create_net(net);
8597	if (ret)
8598		return ret;
8599	locks_start_grace(net, &nn->nfsd4_manager);
8600	nfsd4_client_tracking_init(net);
8601	if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
8602		goto skip_grace;
8603	printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
8604	       nn->nfsd4_grace, net->ns.inum);
8605	trace_nfsd_grace_start(nn);
8606	queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
8607	return 0;
8608
8609skip_grace:
8610	printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
8611			net->ns.inum);
8612	queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
8613	nfsd4_end_grace(nn);
8614	return 0;
8615}
8616
8617/* initialization to perform when the nfsd service is started: */
8618
8619int
8620nfs4_state_start(void)
8621{
8622	int ret;
8623
8624	ret = rhltable_init(&nfs4_file_rhltable, &nfs4_file_rhash_params);
8625	if (ret)
8626		return ret;
8627
8628	ret = nfsd4_create_callback_queue();
8629	if (ret) {
8630		rhltable_destroy(&nfs4_file_rhltable);
8631		return ret;
8632	}
 
 
 
8633
8634	set_max_delegations();
8635	return 0;
 
 
 
 
 
 
8636}
8637
8638void
8639nfs4_state_shutdown_net(struct net *net)
8640{
8641	struct nfs4_delegation *dp = NULL;
8642	struct list_head *pos, *next, reaplist;
8643	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8644
8645	shrinker_free(nn->nfsd_client_shrinker);
8646	cancel_work(&nn->nfsd_shrinker_work);
8647	cancel_delayed_work_sync(&nn->laundromat_work);
8648	locks_end_grace(&nn->nfsd4_manager);
8649
8650	INIT_LIST_HEAD(&reaplist);
8651	spin_lock(&state_lock);
8652	list_for_each_safe(pos, next, &nn->del_recall_lru) {
8653		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8654		unhash_delegation_locked(dp, SC_STATUS_CLOSED);
8655		list_add(&dp->dl_recall_lru, &reaplist);
8656	}
8657	spin_unlock(&state_lock);
8658	list_for_each_safe(pos, next, &reaplist) {
8659		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8660		list_del_init(&dp->dl_recall_lru);
8661		destroy_unhashed_deleg(dp);
8662	}
8663
8664	nfsd4_client_tracking_exit(net);
8665	nfs4_state_destroy_net(net);
8666#ifdef CONFIG_NFSD_V4_2_INTER_SSC
8667	nfsd4_ssc_shutdown_umount(nn);
8668#endif
8669}
8670
8671void
8672nfs4_state_shutdown(void)
8673{
 
8674	nfsd4_destroy_callback_queue();
8675	rhltable_destroy(&nfs4_file_rhltable);
8676}
8677
8678static void
8679get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8680{
8681	if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
8682	    CURRENT_STATEID(stateid))
8683		memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8684}
8685
8686static void
8687put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8688{
8689	if (cstate->minorversion) {
8690		memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
8691		SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8692	}
8693}
8694
8695void
8696clear_current_stateid(struct nfsd4_compound_state *cstate)
8697{
8698	CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8699}
8700
8701/*
8702 * functions to set current state id
8703 */
8704void
8705nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
8706		union nfsd4_op_u *u)
8707{
8708	put_stateid(cstate, &u->open_downgrade.od_stateid);
8709}
8710
8711void
8712nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
8713		union nfsd4_op_u *u)
8714{
8715	put_stateid(cstate, &u->open.op_stateid);
8716}
8717
8718void
8719nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
8720		union nfsd4_op_u *u)
8721{
8722	put_stateid(cstate, &u->close.cl_stateid);
8723}
8724
8725void
8726nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
8727		union nfsd4_op_u *u)
8728{
8729	put_stateid(cstate, &u->lock.lk_resp_stateid);
8730}
8731
8732/*
8733 * functions to consume current state id
8734 */
8735
8736void
8737nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8738		union nfsd4_op_u *u)
8739{
8740	get_stateid(cstate, &u->open_downgrade.od_stateid);
8741}
8742
8743void
8744nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
8745		union nfsd4_op_u *u)
8746{
8747	get_stateid(cstate, &u->delegreturn.dr_stateid);
8748}
8749
8750void
8751nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
8752		union nfsd4_op_u *u)
8753{
8754	get_stateid(cstate, &u->free_stateid.fr_stateid);
8755}
8756
8757void
8758nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
8759		union nfsd4_op_u *u)
8760{
8761	get_stateid(cstate, &u->setattr.sa_stateid);
8762}
8763
8764void
8765nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
8766		union nfsd4_op_u *u)
8767{
8768	get_stateid(cstate, &u->close.cl_stateid);
8769}
8770
8771void
8772nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
8773		union nfsd4_op_u *u)
8774{
8775	get_stateid(cstate, &u->locku.lu_stateid);
8776}
8777
8778void
8779nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
8780		union nfsd4_op_u *u)
8781{
8782	get_stateid(cstate, &u->read.rd_stateid);
8783}
8784
8785void
8786nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
8787		union nfsd4_op_u *u)
8788{
8789	get_stateid(cstate, &u->write.wr_stateid);
8790}
8791
8792/**
8793 * nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict
8794 * @rqstp: RPC transaction context
8795 * @inode: file to be checked for a conflict
8796 * @modified: return true if file was modified
8797 * @size: new size of file if modified is true
8798 *
8799 * This function is called when there is a conflict between a write
8800 * delegation and a change/size GETATTR from another client. The server
8801 * must either use the CB_GETATTR to get the current values of the
8802 * attributes from the client that holds the delegation or recall the
8803 * delegation before replying to the GETATTR. See RFC 8881 section
8804 * 18.7.4.
8805 *
8806 * Returns 0 if there is no conflict; otherwise an nfs_stat
8807 * code is returned.
8808 */
8809__be32
8810nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode,
8811				bool *modified, u64 *size)
8812{
8813	__be32 status;
8814	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8815	struct file_lock_context *ctx;
8816	struct file_lease *fl;
8817	struct nfs4_delegation *dp;
8818	struct iattr attrs;
8819	struct nfs4_cb_fattr *ncf;
8820
8821	*modified = false;
8822	ctx = locks_inode_context(inode);
8823	if (!ctx)
8824		return 0;
8825	spin_lock(&ctx->flc_lock);
8826	for_each_file_lock(fl, &ctx->flc_lease) {
8827		unsigned char type = fl->c.flc_type;
8828
8829		if (fl->c.flc_flags == FL_LAYOUT)
8830			continue;
8831		if (fl->fl_lmops != &nfsd_lease_mng_ops) {
8832			/*
8833			 * non-nfs lease, if it's a lease with F_RDLCK then
8834			 * we are done; there isn't any write delegation
8835			 * on this inode
8836			 */
8837			if (type == F_RDLCK)
8838				break;
8839			goto break_lease;
8840		}
8841		if (type == F_WRLCK) {
8842			dp = fl->c.flc_owner;
8843			if (dp->dl_recall.cb_clp == *(rqstp->rq_lease_breaker)) {
8844				spin_unlock(&ctx->flc_lock);
8845				return 0;
8846			}
8847break_lease:
8848			nfsd_stats_wdeleg_getattr_inc(nn);
8849			dp = fl->c.flc_owner;
8850			ncf = &dp->dl_cb_fattr;
8851			nfs4_cb_getattr(&dp->dl_cb_fattr);
8852			spin_unlock(&ctx->flc_lock);
8853			wait_on_bit_timeout(&ncf->ncf_cb_flags, CB_GETATTR_BUSY,
8854					TASK_INTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT);
8855			if (ncf->ncf_cb_status) {
8856				/* Recall delegation only if client didn't respond */
8857				status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
8858				if (status != nfserr_jukebox ||
8859						!nfsd_wait_for_delegreturn(rqstp, inode))
8860					return status;
8861			}
8862			if (!ncf->ncf_file_modified &&
8863					(ncf->ncf_initial_cinfo != ncf->ncf_cb_change ||
8864					ncf->ncf_cur_fsize != ncf->ncf_cb_fsize))
8865				ncf->ncf_file_modified = true;
8866			if (ncf->ncf_file_modified) {
8867				/*
8868				 * Per section 10.4.3 of RFC 8881, the server would
8869				 * not update the file's metadata with the client's
8870				 * modified size
8871				 */
8872				attrs.ia_mtime = attrs.ia_ctime = current_time(inode);
8873				attrs.ia_valid = ATTR_MTIME | ATTR_CTIME;
8874				setattr_copy(&nop_mnt_idmap, inode, &attrs);
8875				mark_inode_dirty(inode);
8876				ncf->ncf_cur_fsize = ncf->ncf_cb_fsize;
8877				*size = ncf->ncf_cur_fsize;
8878				*modified = true;
8879			}
8880			return 0;
8881		}
8882		break;
8883	}
8884	spin_unlock(&ctx->flc_lock);
8885	return 0;
8886}