fs/nfsd/nfs4state.c

   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/nfs_ssc.h>
  48 #include "xdr4.h"
  49 #include "xdr4cb.h"
  50 #include "vfs.h"
  51 #include "current_stateid.h"
  52
  53 #include "netns.h"
  54 #include "pnfs.h"
  55 #include "filecache.h"
  56 #include "trace.h"
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  59
  60 #define all_ones {{~0,~0},~0}
  61 static const stateid_t one_stateid = {
  62         .si_generation = ~0,
  63         .si_opaque = all_ones,
  64 };
  65 static const stateid_t zero_stateid = {
  66         /* all fields zero */
  67 };
  68 static const stateid_t currentstateid = {
  69         .si_generation = 1,
  70 };
  71 static const stateid_t close_stateid = {
  72         .si_generation = 0xffffffffU,
  73 };
  74
  75 static u64 current_sessionid = 1;
  76
  77 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  78 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  79 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  80 #define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
  81
  82 /* forward declarations */
  83 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
  84 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
  85 void nfsd4_end_grace(struct nfsd_net *nn);
  86 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
  87
  88 /* Locking: */
  89
  90 /*
  91  * Currently used for the del_recall_lru and file hash table.  In an
  92  * effort to decrease the scope of the client_mutex, this spinlock may
  93  * eventually cover more:
  94  */
  95 static DEFINE_SPINLOCK(state_lock);
  96
  97 enum nfsd4_st_mutex_lock_subclass {
  98         OPEN_STATEID_MUTEX = 0,
  99         LOCK_STATEID_MUTEX = 1,
 100 };
 101
 102 /*
 103  * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
 104  * the refcount on the open stateid to drop.
 105  */
 106 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
 107
 108 /*
 109  * A waitqueue where a writer to clients/#/ctl destroying a client can
 110  * wait for cl_rpc_users to drop to 0 and then for the client to be
 111  * unhashed.
 112  */
 113 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
 114
 115 static struct kmem_cache *client_slab;
 116 static struct kmem_cache *openowner_slab;
 117 static struct kmem_cache *lockowner_slab;
 118 static struct kmem_cache *file_slab;
 119 static struct kmem_cache *stateid_slab;
 120 static struct kmem_cache *deleg_slab;
 121 static struct kmem_cache *odstate_slab;
 122
 123 static void free_session(struct nfsd4_session *);
 124
 125 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
 126 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
 127
 128 static struct workqueue_struct *laundry_wq;
 129
 130 int nfsd4_create_laundry_wq(void)
 131 {
 132         int rc = 0;
 133
 134         laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
 135         if (laundry_wq == NULL)
 136                 rc = -ENOMEM;
 137         return rc;
 138 }
 139
 140 void nfsd4_destroy_laundry_wq(void)
 141 {
 142         destroy_workqueue(laundry_wq);
 143 }
 144
 145 static bool is_session_dead(struct nfsd4_session *ses)
 146 {
 147         return ses->se_flags & NFS4_SESSION_DEAD;
 148 }
 149
 150 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 151 {
 152         if (atomic_read(&ses->se_ref) > ref_held_by_me)
 153                 return nfserr_jukebox;
 154         ses->se_flags |= NFS4_SESSION_DEAD;
 155         return nfs_ok;
 156 }
 157
 158 static bool is_client_expired(struct nfs4_client *clp)
 159 {
 160         return clp->cl_time == 0;
 161 }
 162
 163 static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
 164                                         struct nfs4_client *clp)
 165 {
 166         if (clp->cl_state != NFSD4_ACTIVE)
 167                 atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
 168 }
 169
 170 static __be32 get_client_locked(struct nfs4_client *clp)
 171 {
 172         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 173
 174         lockdep_assert_held(&nn->client_lock);
 175
 176         if (is_client_expired(clp))
 177                 return nfserr_expired;
 178         atomic_inc(&clp->cl_rpc_users);
 179         nfsd4_dec_courtesy_client_count(nn, clp);
 180         clp->cl_state = NFSD4_ACTIVE;
 181         return nfs_ok;
 182 }
 183
 184 /* must be called under the client_lock */
 185 static inline void
 186 renew_client_locked(struct nfs4_client *clp)
 187 {
 188         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 189
 190         if (is_client_expired(clp)) {
 191                 WARN_ON(1);
 192                 printk("%s: client (clientid %08x/%08x) already expired\n",
 193                         __func__,
 194                         clp->cl_clientid.cl_boot,
 195                         clp->cl_clientid.cl_id);
 196                 return;
 197         }
 198
 199         list_move_tail(&clp->cl_lru, &nn->client_lru);
 200         clp->cl_time = ktime_get_boottime_seconds();
 201         nfsd4_dec_courtesy_client_count(nn, clp);
 202         clp->cl_state = NFSD4_ACTIVE;
 203 }
 204
 205 static void put_client_renew_locked(struct nfs4_client *clp)
 206 {
 207         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 208
 209         lockdep_assert_held(&nn->client_lock);
 210
 211         if (!atomic_dec_and_test(&clp->cl_rpc_users))
 212                 return;
 213         if (!is_client_expired(clp))
 214                 renew_client_locked(clp);
 215         else
 216                 wake_up_all(&expiry_wq);
 217 }
 218
 219 static void put_client_renew(struct nfs4_client *clp)
 220 {
 221         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 222
 223         if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
 224                 return;
 225         if (!is_client_expired(clp))
 226                 renew_client_locked(clp);
 227         else
 228                 wake_up_all(&expiry_wq);
 229         spin_unlock(&nn->client_lock);
 230 }
 231
 232 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 233 {
 234         __be32 status;
 235
 236         if (is_session_dead(ses))
 237                 return nfserr_badsession;
 238         status = get_client_locked(ses->se_client);
 239         if (status)
 240                 return status;
 241         atomic_inc(&ses->se_ref);
 242         return nfs_ok;
 243 }
 244
 245 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 246 {
 247         struct nfs4_client *clp = ses->se_client;
 248         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 249
 250         lockdep_assert_held(&nn->client_lock);
 251
 252         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 253                 free_session(ses);
 254         put_client_renew_locked(clp);
 255 }
 256
 257 static void nfsd4_put_session(struct nfsd4_session *ses)
 258 {
 259         struct nfs4_client *clp = ses->se_client;
 260         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 261
 262         spin_lock(&nn->client_lock);
 263         nfsd4_put_session_locked(ses);
 264         spin_unlock(&nn->client_lock);
 265 }
 266
 267 static struct nfsd4_blocked_lock *
 268 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 269                         struct nfsd_net *nn)
 270 {
 271         struct nfsd4_blocked_lock *cur, *found = NULL;
 272
 273         spin_lock(&nn->blocked_locks_lock);
 274         list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
 275                 if (fh_match(fh, &cur->nbl_fh)) {
 276                         list_del_init(&cur->nbl_list);
 277                         WARN_ON(list_empty(&cur->nbl_lru));
 278                         list_del_init(&cur->nbl_lru);
 279                         found = cur;
 280                         break;
 281                 }
 282         }
 283         spin_unlock(&nn->blocked_locks_lock);
 284         if (found)
 285                 locks_delete_block(&found->nbl_lock);
 286         return found;
 287 }
 288
 289 static struct nfsd4_blocked_lock *
 290 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 291                         struct nfsd_net *nn)
 292 {
 293         struct nfsd4_blocked_lock *nbl;
 294
 295         nbl = find_blocked_lock(lo, fh, nn);
 296         if (!nbl) {
 297                 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
 298                 if (nbl) {
 299                         INIT_LIST_HEAD(&nbl->nbl_list);
 300                         INIT_LIST_HEAD(&nbl->nbl_lru);
 301                         fh_copy_shallow(&nbl->nbl_fh, fh);
 302                         locks_init_lock(&nbl->nbl_lock);
 303                         kref_init(&nbl->nbl_kref);
 304                         nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
 305                                         &nfsd4_cb_notify_lock_ops,
 306                                         NFSPROC4_CLNT_CB_NOTIFY_LOCK);
 307                 }
 308         }
 309         return nbl;
 310 }
 311
 312 static void
 313 free_nbl(struct kref *kref)
 314 {
 315         struct nfsd4_blocked_lock *nbl;
 316
 317         nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
 318         kfree(nbl);
 319 }
 320
 321 static void
 322 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
 323 {
 324         locks_delete_block(&nbl->nbl_lock);
 325         locks_release_private(&nbl->nbl_lock);
 326         kref_put(&nbl->nbl_kref, free_nbl);
 327 }
 328
 329 static void
 330 remove_blocked_locks(struct nfs4_lockowner *lo)
 331 {
 332         struct nfs4_client *clp = lo->lo_owner.so_client;
 333         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 334         struct nfsd4_blocked_lock *nbl;
 335         LIST_HEAD(reaplist);
 336
 337         /* Dequeue all blocked locks */
 338         spin_lock(&nn->blocked_locks_lock);
 339         while (!list_empty(&lo->lo_blocked)) {
 340                 nbl = list_first_entry(&lo->lo_blocked,
 341                                         struct nfsd4_blocked_lock,
 342                                         nbl_list);
 343                 list_del_init(&nbl->nbl_list);
 344                 WARN_ON(list_empty(&nbl->nbl_lru));
 345                 list_move(&nbl->nbl_lru, &reaplist);
 346         }
 347         spin_unlock(&nn->blocked_locks_lock);
 348
 349         /* Now free them */
 350         while (!list_empty(&reaplist)) {
 351                 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
 352                                         nbl_lru);
 353                 list_del_init(&nbl->nbl_lru);
 354                 free_blocked_lock(nbl);
 355         }
 356 }
 357
 358 static void
 359 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
 360 {
 361         struct nfsd4_blocked_lock       *nbl = container_of(cb,
 362                                                 struct nfsd4_blocked_lock, nbl_cb);
 363         locks_delete_block(&nbl->nbl_lock);
 364 }
 365
 366 static int
 367 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
 368 {
 369         trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
 370
 371         /*
 372          * Since this is just an optimization, we don't try very hard if it
 373          * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
 374          * just quit trying on anything else.
 375          */
 376         switch (task->tk_status) {
 377         case -NFS4ERR_DELAY:
 378                 rpc_delay(task, 1 * HZ);
 379                 return 0;
 380         default:
 381                 return 1;
 382         }
 383 }
 384
 385 static void
 386 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
 387 {
 388         struct nfsd4_blocked_lock       *nbl = container_of(cb,
 389                                                 struct nfsd4_blocked_lock, nbl_cb);
 390
 391         free_blocked_lock(nbl);
 392 }
 393
 394 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
 395         .prepare        = nfsd4_cb_notify_lock_prepare,
 396         .done           = nfsd4_cb_notify_lock_done,
 397         .release        = nfsd4_cb_notify_lock_release,
 398 };
 399
 400 /*
 401  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 402  * st_{access,deny}_bmap field of the stateid, in order to track not
 403  * only what share bits are currently in force, but also what
 404  * combinations of share bits previous opens have used.  This allows us
 405  * to enforce the recommendation in
 406  * https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
 407  * the server return an error if the client attempt to downgrade to a
 408  * combination of share bits not explicable by closing some of its
 409  * previous opens.
 410  *
 411  * This enforcement is arguably incomplete, since we don't keep
 412  * track of access/deny bit combinations; so, e.g., we allow:
 413  *
 414  *      OPEN allow read, deny write
 415  *      OPEN allow both, deny none
 416  *      DOWNGRADE allow read, deny none
 417  *
 418  * which we should reject.
 419  *
 420  * But you could also argue that our current code is already overkill,
 421  * since it only exists to return NFS4ERR_INVAL on incorrect client
 422  * behavior.
 423  */
 424 static unsigned int
 425 bmap_to_share_mode(unsigned long bmap)
 426 {
 427         int i;
 428         unsigned int access = 0;
 429
 430         for (i = 1; i < 4; i++) {
 431                 if (test_bit(i, &bmap))
 432                         access |= i;
 433         }
 434         return access;
 435 }
 436
 437 /* set share access for a given stateid */
 438 static inline void
 439 set_access(u32 access, struct nfs4_ol_stateid *stp)
 440 {
 441         unsigned char mask = 1 << access;
 442
 443         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 444         stp->st_access_bmap |= mask;
 445 }
 446
 447 /* clear share access for a given stateid */
 448 static inline void
 449 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 450 {
 451         unsigned char mask = 1 << access;
 452
 453         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 454         stp->st_access_bmap &= ~mask;
 455 }
 456
 457 /* test whether a given stateid has access */
 458 static inline bool
 459 test_access(u32 access, struct nfs4_ol_stateid *stp)
 460 {
 461         unsigned char mask = 1 << access;
 462
 463         return (bool)(stp->st_access_bmap & mask);
 464 }
 465
 466 /* set share deny for a given stateid */
 467 static inline void
 468 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
 469 {
 470         unsigned char mask = 1 << deny;
 471
 472         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 473         stp->st_deny_bmap |= mask;
 474 }
 475
 476 /* clear share deny for a given stateid */
 477 static inline void
 478 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
 479 {
 480         unsigned char mask = 1 << deny;
 481
 482         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 483         stp->st_deny_bmap &= ~mask;
 484 }
 485
 486 /* test whether a given stateid is denying specific access */
 487 static inline bool
 488 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
 489 {
 490         unsigned char mask = 1 << deny;
 491
 492         return (bool)(stp->st_deny_bmap & mask);
 493 }
 494
 495 static int nfs4_access_to_omode(u32 access)
 496 {
 497         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 498         case NFS4_SHARE_ACCESS_READ:
 499                 return O_RDONLY;
 500         case NFS4_SHARE_ACCESS_WRITE:
 501                 return O_WRONLY;
 502         case NFS4_SHARE_ACCESS_BOTH:
 503                 return O_RDWR;
 504         }
 505         WARN_ON_ONCE(1);
 506         return O_RDONLY;
 507 }
 508
 509 static inline int
 510 access_permit_read(struct nfs4_ol_stateid *stp)
 511 {
 512         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
 513                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
 514                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
 515 }
 516
 517 static inline int
 518 access_permit_write(struct nfs4_ol_stateid *stp)
 519 {
 520         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
 521                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
 522 }
 523
 524 static inline struct nfs4_stateowner *
 525 nfs4_get_stateowner(struct nfs4_stateowner *sop)
 526 {
 527         atomic_inc(&sop->so_count);
 528         return sop;
 529 }
 530
 531 static int
 532 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
 533 {
 534         return (sop->so_owner.len == owner->len) &&
 535                 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
 536 }
 537
 538 static struct nfs4_openowner *
 539 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
 540                         struct nfs4_client *clp)
 541 {
 542         struct nfs4_stateowner *so;
 543
 544         lockdep_assert_held(&clp->cl_lock);
 545
 546         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
 547                             so_strhash) {
 548                 if (!so->so_is_open_owner)
 549                         continue;
 550                 if (same_owner_str(so, &open->op_owner))
 551                         return openowner(nfs4_get_stateowner(so));
 552         }
 553         return NULL;
 554 }
 555
 556 static struct nfs4_openowner *
 557 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
 558                         struct nfs4_client *clp)
 559 {
 560         struct nfs4_openowner *oo;
 561
 562         spin_lock(&clp->cl_lock);
 563         oo = find_openstateowner_str_locked(hashval, open, clp);
 564         spin_unlock(&clp->cl_lock);
 565         return oo;
 566 }
 567
 568 static inline u32
 569 opaque_hashval(const void *ptr, int nbytes)
 570 {
 571         unsigned char *cptr = (unsigned char *) ptr;
 572
 573         u32 x = 0;
 574         while (nbytes--) {
 575                 x *= 37;
 576                 x += *cptr++;
 577         }
 578         return x;
 579 }
 580
 581 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
 582 {
 583         struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
 584
 585         kmem_cache_free(file_slab, fp);
 586 }
 587
 588 void
 589 put_nfs4_file(struct nfs4_file *fi)
 590 {
 591         might_lock(&state_lock);
 592
 593         if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
 594                 hlist_del_rcu(&fi->fi_hash);
 595                 spin_unlock(&state_lock);
 596                 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
 597                 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
 598                 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
 599         }
 600 }
 601
 602 static struct nfsd_file *
 603 __nfs4_get_fd(struct nfs4_file *f, int oflag)
 604 {
 605         if (f->fi_fds[oflag])
 606                 return nfsd_file_get(f->fi_fds[oflag]);
 607         return NULL;
 608 }
 609
 610 static struct nfsd_file *
 611 find_writeable_file_locked(struct nfs4_file *f)
 612 {
 613         struct nfsd_file *ret;
 614
 615         lockdep_assert_held(&f->fi_lock);
 616
 617         ret = __nfs4_get_fd(f, O_WRONLY);
 618         if (!ret)
 619                 ret = __nfs4_get_fd(f, O_RDWR);
 620         return ret;
 621 }
 622
 623 static struct nfsd_file *
 624 find_writeable_file(struct nfs4_file *f)
 625 {
 626         struct nfsd_file *ret;
 627
 628         spin_lock(&f->fi_lock);
 629         ret = find_writeable_file_locked(f);
 630         spin_unlock(&f->fi_lock);
 631
 632         return ret;
 633 }
 634
 635 static struct nfsd_file *
 636 find_readable_file_locked(struct nfs4_file *f)
 637 {
 638         struct nfsd_file *ret;
 639
 640         lockdep_assert_held(&f->fi_lock);
 641
 642         ret = __nfs4_get_fd(f, O_RDONLY);
 643         if (!ret)
 644                 ret = __nfs4_get_fd(f, O_RDWR);
 645         return ret;
 646 }
 647
 648 static struct nfsd_file *
 649 find_readable_file(struct nfs4_file *f)
 650 {
 651         struct nfsd_file *ret;
 652
 653         spin_lock(&f->fi_lock);
 654         ret = find_readable_file_locked(f);
 655         spin_unlock(&f->fi_lock);
 656
 657         return ret;
 658 }
 659
 660 struct nfsd_file *
 661 find_any_file(struct nfs4_file *f)
 662 {
 663         struct nfsd_file *ret;
 664
 665         if (!f)
 666                 return NULL;
 667         spin_lock(&f->fi_lock);
 668         ret = __nfs4_get_fd(f, O_RDWR);
 669         if (!ret) {
 670                 ret = __nfs4_get_fd(f, O_WRONLY);
 671                 if (!ret)
 672                         ret = __nfs4_get_fd(f, O_RDONLY);
 673         }
 674         spin_unlock(&f->fi_lock);
 675         return ret;
 676 }
 677
 678 static struct nfsd_file *find_deleg_file(struct nfs4_file *f)
 679 {
 680         struct nfsd_file *ret = NULL;
 681
 682         spin_lock(&f->fi_lock);
 683         if (f->fi_deleg_file)
 684                 ret = nfsd_file_get(f->fi_deleg_file);
 685         spin_unlock(&f->fi_lock);
 686         return ret;
 687 }
 688
 689 static atomic_long_t num_delegations;
 690 unsigned long max_delegations;
 691
 692 /*
 693  * Open owner state (share locks)
 694  */
 695
 696 /* hash tables for lock and open owners */
 697 #define OWNER_HASH_BITS              8
 698 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 699 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 700
 701 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
 702 {
 703         unsigned int ret;
 704
 705         ret = opaque_hashval(ownername->data, ownername->len);
 706         return ret & OWNER_HASH_MASK;
 707 }
 708
 709 /* hash table for nfs4_file */
 710 #define FILE_HASH_BITS                   8
 711 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 712
 713 static unsigned int file_hashval(struct svc_fh *fh)
 714 {
 715         struct inode *inode = d_inode(fh->fh_dentry);
 716
 717         /* XXX: why not (here & in file cache) use inode? */
 718         return (unsigned int)hash_long(inode->i_ino, FILE_HASH_BITS);
 719 }
 720
 721 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 722
 723 /*
 724  * Check if courtesy clients have conflicting access and resolve it if possible
 725  *
 726  * access:  is op_share_access if share_access is true.
 727  *          Check if access mode, op_share_access, would conflict with
 728  *          the current deny mode of the file 'fp'.
 729  * access:  is op_share_deny if share_access is false.
 730  *          Check if the deny mode, op_share_deny, would conflict with
 731  *          current access of the file 'fp'.
 732  * stp:     skip checking this entry.
 733  * new_stp: normal open, not open upgrade.
 734  *
 735  * Function returns:
 736  *      false - access/deny mode conflict with normal client.
 737  *      true  - no conflict or conflict with courtesy client(s) is resolved.
 738  */
 739 static bool
 740 nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
 741                 struct nfs4_ol_stateid *stp, u32 access, bool share_access)
 742 {
 743         struct nfs4_ol_stateid *st;
 744         bool resolvable = true;
 745         unsigned char bmap;
 746         struct nfsd_net *nn;
 747         struct nfs4_client *clp;
 748
 749         lockdep_assert_held(&fp->fi_lock);
 750         list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
 751                 /* ignore lock stateid */
 752                 if (st->st_openstp)
 753                         continue;
 754                 if (st == stp && new_stp)
 755                         continue;
 756                 /* check file access against deny mode or vice versa */
 757                 bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
 758                 if (!(access & bmap_to_share_mode(bmap)))
 759                         continue;
 760                 clp = st->st_stid.sc_client;
 761                 if (try_to_expire_client(clp))
 762                         continue;
 763                 resolvable = false;
 764                 break;
 765         }
 766         if (resolvable) {
 767                 clp = stp->st_stid.sc_client;
 768                 nn = net_generic(clp->net, nfsd_net_id);
 769                 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
 770         }
 771         return resolvable;
 772 }
 773
 774 static void
 775 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 776 {
 777         lockdep_assert_held(&fp->fi_lock);
 778
 779         if (access & NFS4_SHARE_ACCESS_WRITE)
 780                 atomic_inc(&fp->fi_access[O_WRONLY]);
 781         if (access & NFS4_SHARE_ACCESS_READ)
 782                 atomic_inc(&fp->fi_access[O_RDONLY]);
 783 }
 784
 785 static __be32
 786 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 787 {
 788         lockdep_assert_held(&fp->fi_lock);
 789
 790         /* Does this access mode make sense? */
 791         if (access & ~NFS4_SHARE_ACCESS_BOTH)
 792                 return nfserr_inval;
 793
 794         /* Does it conflict with a deny mode already set? */
 795         if ((access & fp->fi_share_deny) != 0)
 796                 return nfserr_share_denied;
 797
 798         __nfs4_file_get_access(fp, access);
 799         return nfs_ok;
 800 }
 801
 802 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
 803 {
 804         /* Common case is that there is no deny mode. */
 805         if (deny) {
 806                 /* Does this deny mode make sense? */
 807                 if (deny & ~NFS4_SHARE_DENY_BOTH)
 808                         return nfserr_inval;
 809
 810                 if ((deny & NFS4_SHARE_DENY_READ) &&
 811                     atomic_read(&fp->fi_access[O_RDONLY]))
 812                         return nfserr_share_denied;
 813
 814                 if ((deny & NFS4_SHARE_DENY_WRITE) &&
 815                     atomic_read(&fp->fi_access[O_WRONLY]))
 816                         return nfserr_share_denied;
 817         }
 818         return nfs_ok;
 819 }
 820
 821 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 822 {
 823         might_lock(&fp->fi_lock);
 824
 825         if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
 826                 struct nfsd_file *f1 = NULL;
 827                 struct nfsd_file *f2 = NULL;
 828
 829                 swap(f1, fp->fi_fds[oflag]);
 830                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 831                         swap(f2, fp->fi_fds[O_RDWR]);
 832                 spin_unlock(&fp->fi_lock);
 833                 if (f1)
 834                         nfsd_file_close(f1);
 835                 if (f2)
 836                         nfsd_file_close(f2);
 837         }
 838 }
 839
 840 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
 841 {
 842         WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
 843
 844         if (access & NFS4_SHARE_ACCESS_WRITE)
 845                 __nfs4_file_put_access(fp, O_WRONLY);
 846         if (access & NFS4_SHARE_ACCESS_READ)
 847                 __nfs4_file_put_access(fp, O_RDONLY);
 848 }
 849
 850 /*
 851  * Allocate a new open/delegation state counter. This is needed for
 852  * pNFS for proper return on close semantics.
 853  *
 854  * Note that we only allocate it for pNFS-enabled exports, otherwise
 855  * all pointers to struct nfs4_clnt_odstate are always NULL.
 856  */
 857 static struct nfs4_clnt_odstate *
 858 alloc_clnt_odstate(struct nfs4_client *clp)
 859 {
 860         struct nfs4_clnt_odstate *co;
 861
 862         co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
 863         if (co) {
 864                 co->co_client = clp;
 865                 refcount_set(&co->co_odcount, 1);
 866         }
 867         return co;
 868 }
 869
 870 static void
 871 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
 872 {
 873         struct nfs4_file *fp = co->co_file;
 874
 875         lockdep_assert_held(&fp->fi_lock);
 876         list_add(&co->co_perfile, &fp->fi_clnt_odstate);
 877 }
 878
 879 static inline void
 880 get_clnt_odstate(struct nfs4_clnt_odstate *co)
 881 {
 882         if (co)
 883                 refcount_inc(&co->co_odcount);
 884 }
 885
 886 static void
 887 put_clnt_odstate(struct nfs4_clnt_odstate *co)
 888 {
 889         struct nfs4_file *fp;
 890
 891         if (!co)
 892                 return;
 893
 894         fp = co->co_file;
 895         if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
 896                 list_del(&co->co_perfile);
 897                 spin_unlock(&fp->fi_lock);
 898
 899                 nfsd4_return_all_file_layouts(co->co_client, fp);
 900                 kmem_cache_free(odstate_slab, co);
 901         }
 902 }
 903
 904 static struct nfs4_clnt_odstate *
 905 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
 906 {
 907         struct nfs4_clnt_odstate *co;
 908         struct nfs4_client *cl;
 909
 910         if (!new)
 911                 return NULL;
 912
 913         cl = new->co_client;
 914
 915         spin_lock(&fp->fi_lock);
 916         list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
 917                 if (co->co_client == cl) {
 918                         get_clnt_odstate(co);
 919                         goto out;
 920                 }
 921         }
 922         co = new;
 923         co->co_file = fp;
 924         hash_clnt_odstate_locked(new);
 925 out:
 926         spin_unlock(&fp->fi_lock);
 927         return co;
 928 }
 929
 930 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
 931                                   void (*sc_free)(struct nfs4_stid *))
 932 {
 933         struct nfs4_stid *stid;
 934         int new_id;
 935
 936         stid = kmem_cache_zalloc(slab, GFP_KERNEL);
 937         if (!stid)
 938                 return NULL;
 939
 940         idr_preload(GFP_KERNEL);
 941         spin_lock(&cl->cl_lock);
 942         /* Reserving 0 for start of file in nfsdfs "states" file: */
 943         new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
 944         spin_unlock(&cl->cl_lock);
 945         idr_preload_end();
 946         if (new_id < 0)
 947                 goto out_free;
 948
 949         stid->sc_free = sc_free;
 950         stid->sc_client = cl;
 951         stid->sc_stateid.si_opaque.so_id = new_id;
 952         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 953         /* Will be incremented before return to client: */
 954         refcount_set(&stid->sc_count, 1);
 955         spin_lock_init(&stid->sc_lock);
 956         INIT_LIST_HEAD(&stid->sc_cp_list);
 957
 958         /*
 959          * It shouldn't be a problem to reuse an opaque stateid value.
 960          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 961          * example, a stray write retransmission could be accepted by
 962          * the server when it should have been rejected.  Therefore,
 963          * adopt a trick from the sctp code to attempt to maximize the
 964          * amount of time until an id is reused, by ensuring they always
 965          * "increase" (mod INT_MAX):
 966          */
 967         return stid;
 968 out_free:
 969         kmem_cache_free(slab, stid);
 970         return NULL;
 971 }
 972
 973 /*
 974  * Create a unique stateid_t to represent each COPY.
 975  */
 976 static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
 977                               unsigned char cs_type)
 978 {
 979         int new_id;
 980
 981         stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
 982         stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
 983         stid->cs_type = cs_type;
 984
 985         idr_preload(GFP_KERNEL);
 986         spin_lock(&nn->s2s_cp_lock);
 987         new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
 988         stid->cs_stid.si_opaque.so_id = new_id;
 989         stid->cs_stid.si_generation = 1;
 990         spin_unlock(&nn->s2s_cp_lock);
 991         idr_preload_end();
 992         if (new_id < 0)
 993                 return 0;
 994         return 1;
 995 }
 996
 997 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
 998 {
 999         return nfs4_init_cp_state(nn, &copy->cp_stateid, NFS4_COPY_STID);
1000 }
1001
1002 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
1003                                                      struct nfs4_stid *p_stid)
1004 {
1005         struct nfs4_cpntf_state *cps;
1006
1007         cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
1008         if (!cps)
1009                 return NULL;
1010         cps->cpntf_time = ktime_get_boottime_seconds();
1011         refcount_set(&cps->cp_stateid.cs_count, 1);
1012         if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
1013                 goto out_free;
1014         spin_lock(&nn->s2s_cp_lock);
1015         list_add(&cps->cp_list, &p_stid->sc_cp_list);
1016         spin_unlock(&nn->s2s_cp_lock);
1017         return cps;
1018 out_free:
1019         kfree(cps);
1020         return NULL;
1021 }
1022
1023 void nfs4_free_copy_state(struct nfsd4_copy *copy)
1024 {
1025         struct nfsd_net *nn;
1026
1027         WARN_ON_ONCE(copy->cp_stateid.cs_type != NFS4_COPY_STID);
1028         nn = net_generic(copy->cp_clp->net, nfsd_net_id);
1029         spin_lock(&nn->s2s_cp_lock);
1030         idr_remove(&nn->s2s_cp_stateids,
1031                    copy->cp_stateid.cs_stid.si_opaque.so_id);
1032         spin_unlock(&nn->s2s_cp_lock);
1033 }
1034
1035 static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
1036 {
1037         struct nfs4_cpntf_state *cps;
1038         struct nfsd_net *nn;
1039
1040         nn = net_generic(net, nfsd_net_id);
1041         spin_lock(&nn->s2s_cp_lock);
1042         while (!list_empty(&stid->sc_cp_list)) {
1043                 cps = list_first_entry(&stid->sc_cp_list,
1044                                        struct nfs4_cpntf_state, cp_list);
1045                 _free_cpntf_state_locked(nn, cps);
1046         }
1047         spin_unlock(&nn->s2s_cp_lock);
1048 }
1049
1050 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
1051 {
1052         struct nfs4_stid *stid;
1053
1054         stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
1055         if (!stid)
1056                 return NULL;
1057
1058         return openlockstateid(stid);
1059 }
1060
1061 static void nfs4_free_deleg(struct nfs4_stid *stid)
1062 {
1063         struct nfs4_delegation *dp = delegstateid(stid);
1064
1065         WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
1066         WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
1067         WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
1068         WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
1069         kmem_cache_free(deleg_slab, stid);
1070         atomic_long_dec(&num_delegations);
1071 }
1072
1073 /*
1074  * When we recall a delegation, we should be careful not to hand it
1075  * out again straight away.
1076  * To ensure this we keep a pair of bloom filters ('new' and 'old')
1077  * in which the filehandles of recalled delegations are "stored".
1078  * If a filehandle appear in either filter, a delegation is blocked.
1079  * When a delegation is recalled, the filehandle is stored in the "new"
1080  * filter.
1081  * Every 30 seconds we swap the filters and clear the "new" one,
1082  * unless both are empty of course.
1083  *
1084  * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
1085  * low 3 bytes as hash-table indices.
1086  *
1087  * 'blocked_delegations_lock', which is always taken in block_delegations(),
1088  * is used to manage concurrent access.  Testing does not need the lock
1089  * except when swapping the two filters.
1090  */
1091 static DEFINE_SPINLOCK(blocked_delegations_lock);
1092 static struct bloom_pair {
1093         int     entries, old_entries;
1094         time64_t swap_time;
1095         int     new; /* index into 'set' */
1096         DECLARE_BITMAP(set[2], 256);
1097 } blocked_delegations;
1098
1099 static int delegation_blocked(struct knfsd_fh *fh)
1100 {
1101         u32 hash;
1102         struct bloom_pair *bd = &blocked_delegations;
1103
1104         if (bd->entries == 0)
1105                 return 0;
1106         if (ktime_get_seconds() - bd->swap_time > 30) {
1107                 spin_lock(&blocked_delegations_lock);
1108                 if (ktime_get_seconds() - bd->swap_time > 30) {
1109                         bd->entries -= bd->old_entries;
1110                         bd->old_entries = bd->entries;
1111                         memset(bd->set[bd->new], 0,
1112                                sizeof(bd->set[0]));
1113                         bd->new = 1-bd->new;
1114                         bd->swap_time = ktime_get_seconds();
1115                 }
1116                 spin_unlock(&blocked_delegations_lock);
1117         }
1118         hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1119         if (test_bit(hash&255, bd->set[0]) &&
1120             test_bit((hash>>8)&255, bd->set[0]) &&
1121             test_bit((hash>>16)&255, bd->set[0]))
1122                 return 1;
1123
1124         if (test_bit(hash&255, bd->set[1]) &&
1125             test_bit((hash>>8)&255, bd->set[1]) &&
1126             test_bit((hash>>16)&255, bd->set[1]))
1127                 return 1;
1128
1129         return 0;
1130 }
1131
1132 static void block_delegations(struct knfsd_fh *fh)
1133 {
1134         u32 hash;
1135         struct bloom_pair *bd = &blocked_delegations;
1136
1137         hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1138
1139         spin_lock(&blocked_delegations_lock);
1140         __set_bit(hash&255, bd->set[bd->new]);
1141         __set_bit((hash>>8)&255, bd->set[bd->new]);
1142         __set_bit((hash>>16)&255, bd->set[bd->new]);
1143         if (bd->entries == 0)
1144                 bd->swap_time = ktime_get_seconds();
1145         bd->entries += 1;
1146         spin_unlock(&blocked_delegations_lock);
1147 }
1148
1149 static struct nfs4_delegation *
1150 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1151                  struct nfs4_clnt_odstate *odstate)
1152 {
1153         struct nfs4_delegation *dp;
1154         long n;
1155
1156         dprintk("NFSD alloc_init_deleg\n");
1157         n = atomic_long_inc_return(&num_delegations);
1158         if (n < 0 || n > max_delegations)
1159                 goto out_dec;
1160         if (delegation_blocked(&fp->fi_fhandle))
1161                 goto out_dec;
1162         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
1163         if (dp == NULL)
1164                 goto out_dec;
1165
1166         /*
1167          * delegation seqid's are never incremented.  The 4.1 special
1168          * meaning of seqid 0 isn't meaningful, really, but let's avoid
1169          * 0 anyway just for consistency and use 1:
1170          */
1171         dp->dl_stid.sc_stateid.si_generation = 1;
1172         INIT_LIST_HEAD(&dp->dl_perfile);
1173         INIT_LIST_HEAD(&dp->dl_perclnt);
1174         INIT_LIST_HEAD(&dp->dl_recall_lru);
1175         dp->dl_clnt_odstate = odstate;
1176         get_clnt_odstate(odstate);
1177         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
1178         dp->dl_retries = 1;
1179         dp->dl_recalled = false;
1180         nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
1181                       &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
1182         get_nfs4_file(fp);
1183         dp->dl_stid.sc_file = fp;
1184         return dp;
1185 out_dec:
1186         atomic_long_dec(&num_delegations);
1187         return NULL;
1188 }
1189
1190 void
1191 nfs4_put_stid(struct nfs4_stid *s)
1192 {
1193         struct nfs4_file *fp = s->sc_file;
1194         struct nfs4_client *clp = s->sc_client;
1195
1196         might_lock(&clp->cl_lock);
1197
1198         if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
1199                 wake_up_all(&close_wq);
1200                 return;
1201         }
1202         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1203         nfs4_free_cpntf_statelist(clp->net, s);
1204         spin_unlock(&clp->cl_lock);
1205         s->sc_free(s);
1206         if (fp)
1207                 put_nfs4_file(fp);
1208 }
1209
1210 void
1211 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1212 {
1213         stateid_t *src = &stid->sc_stateid;
1214
1215         spin_lock(&stid->sc_lock);
1216         if (unlikely(++src->si_generation == 0))
1217                 src->si_generation = 1;
1218         memcpy(dst, src, sizeof(*dst));
1219         spin_unlock(&stid->sc_lock);
1220 }
1221
1222 static void put_deleg_file(struct nfs4_file *fp)
1223 {
1224         struct nfsd_file *nf = NULL;
1225
1226         spin_lock(&fp->fi_lock);
1227         if (--fp->fi_delegees == 0)
1228                 swap(nf, fp->fi_deleg_file);
1229         spin_unlock(&fp->fi_lock);
1230
1231         if (nf)
1232                 nfsd_file_put(nf);
1233 }
1234
1235 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1236 {
1237         struct nfs4_file *fp = dp->dl_stid.sc_file;
1238         struct nfsd_file *nf = fp->fi_deleg_file;
1239
1240         WARN_ON_ONCE(!fp->fi_delegees);
1241
1242         vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1243         put_deleg_file(fp);
1244 }
1245
1246 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1247 {
1248         put_clnt_odstate(dp->dl_clnt_odstate);
1249         nfs4_unlock_deleg_lease(dp);
1250         nfs4_put_stid(&dp->dl_stid);
1251 }
1252
1253 void nfs4_unhash_stid(struct nfs4_stid *s)
1254 {
1255         s->sc_type = 0;
1256 }
1257
1258 /**
1259  * nfs4_delegation_exists - Discover if this delegation already exists
1260  * @clp:     a pointer to the nfs4_client we're granting a delegation to
1261  * @fp:      a pointer to the nfs4_file we're granting a delegation on
1262  *
1263  * Return:
1264  *      On success: true iff an existing delegation is found
1265  */
1266
1267 static bool
1268 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1269 {
1270         struct nfs4_delegation *searchdp = NULL;
1271         struct nfs4_client *searchclp = NULL;
1272
1273         lockdep_assert_held(&state_lock);
1274         lockdep_assert_held(&fp->fi_lock);
1275
1276         list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1277                 searchclp = searchdp->dl_stid.sc_client;
1278                 if (clp == searchclp) {
1279                         return true;
1280                 }
1281         }
1282         return false;
1283 }
1284
1285 /**
1286  * hash_delegation_locked - Add a delegation to the appropriate lists
1287  * @dp:     a pointer to the nfs4_delegation we are adding.
1288  * @fp:     a pointer to the nfs4_file we're granting a delegation on
1289  *
1290  * Return:
1291  *      On success: NULL if the delegation was successfully hashed.
1292  *
1293  *      On error: -EAGAIN if one was previously granted to this
1294  *                 nfs4_client for this nfs4_file. Delegation is not hashed.
1295  *
1296  */
1297
1298 static int
1299 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1300 {
1301         struct nfs4_client *clp = dp->dl_stid.sc_client;
1302
1303         lockdep_assert_held(&state_lock);
1304         lockdep_assert_held(&fp->fi_lock);
1305
1306         if (nfs4_delegation_exists(clp, fp))
1307                 return -EAGAIN;
1308         refcount_inc(&dp->dl_stid.sc_count);
1309         dp->dl_stid.sc_type = NFS4_DELEG_STID;
1310         list_add(&dp->dl_perfile, &fp->fi_delegations);
1311         list_add(&dp->dl_perclnt, &clp->cl_delegations);
1312         return 0;
1313 }
1314
1315 static bool delegation_hashed(struct nfs4_delegation *dp)
1316 {
1317         return !(list_empty(&dp->dl_perfile));
1318 }
1319
1320 static bool
1321 unhash_delegation_locked(struct nfs4_delegation *dp)
1322 {
1323         struct nfs4_file *fp = dp->dl_stid.sc_file;
1324
1325         lockdep_assert_held(&state_lock);
1326
1327         if (!delegation_hashed(dp))
1328                 return false;
1329
1330         dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
1331         /* Ensure that deleg break won't try to requeue it */
1332         ++dp->dl_time;
1333         spin_lock(&fp->fi_lock);
1334         list_del_init(&dp->dl_perclnt);
1335         list_del_init(&dp->dl_recall_lru);
1336         list_del_init(&dp->dl_perfile);
1337         spin_unlock(&fp->fi_lock);
1338         return true;
1339 }
1340
1341 static void destroy_delegation(struct nfs4_delegation *dp)
1342 {
1343         bool unhashed;
1344
1345         spin_lock(&state_lock);
1346         unhashed = unhash_delegation_locked(dp);
1347         spin_unlock(&state_lock);
1348         if (unhashed)
1349                 destroy_unhashed_deleg(dp);
1350 }
1351
1352 static void revoke_delegation(struct nfs4_delegation *dp)
1353 {
1354         struct nfs4_client *clp = dp->dl_stid.sc_client;
1355
1356         WARN_ON(!list_empty(&dp->dl_recall_lru));
1357
1358         if (clp->cl_minorversion) {
1359                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1360                 refcount_inc(&dp->dl_stid.sc_count);
1361                 spin_lock(&clp->cl_lock);
1362                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1363                 spin_unlock(&clp->cl_lock);
1364         }
1365         destroy_unhashed_deleg(dp);
1366 }
1367
1368 /*
1369  * SETCLIENTID state
1370  */
1371
1372 static unsigned int clientid_hashval(u32 id)
1373 {
1374         return id & CLIENT_HASH_MASK;
1375 }
1376
1377 static unsigned int clientstr_hashval(struct xdr_netobj name)
1378 {
1379         return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1380 }
1381
1382 /*
1383  * A stateid that had a deny mode associated with it is being released
1384  * or downgraded. Recalculate the deny mode on the file.
1385  */
1386 static void
1387 recalculate_deny_mode(struct nfs4_file *fp)
1388 {
1389         struct nfs4_ol_stateid *stp;
1390
1391         spin_lock(&fp->fi_lock);
1392         fp->fi_share_deny = 0;
1393         list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1394                 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1395         spin_unlock(&fp->fi_lock);
1396 }
1397
1398 static void
1399 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1400 {
1401         int i;
1402         bool change = false;
1403
1404         for (i = 1; i < 4; i++) {
1405                 if ((i & deny) != i) {
1406                         change = true;
1407                         clear_deny(i, stp);
1408                 }
1409         }
1410
1411         /* Recalculate per-file deny mode if there was a change */
1412         if (change)
1413                 recalculate_deny_mode(stp->st_stid.sc_file);
1414 }
1415
1416 /* release all access and file references for a given stateid */
1417 static void
1418 release_all_access(struct nfs4_ol_stateid *stp)
1419 {
1420         int i;
1421         struct nfs4_file *fp = stp->st_stid.sc_file;
1422
1423         if (fp && stp->st_deny_bmap != 0)
1424                 recalculate_deny_mode(fp);
1425
1426         for (i = 1; i < 4; i++) {
1427                 if (test_access(i, stp))
1428                         nfs4_file_put_access(stp->st_stid.sc_file, i);
1429                 clear_access(i, stp);
1430         }
1431 }
1432
1433 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1434 {
1435         kfree(sop->so_owner.data);
1436         sop->so_ops->so_free(sop);
1437 }
1438
1439 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1440 {
1441         struct nfs4_client *clp = sop->so_client;
1442
1443         might_lock(&clp->cl_lock);
1444
1445         if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1446                 return;
1447         sop->so_ops->so_unhash(sop);
1448         spin_unlock(&clp->cl_lock);
1449         nfs4_free_stateowner(sop);
1450 }
1451
1452 static bool
1453 nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1454 {
1455         return list_empty(&stp->st_perfile);
1456 }
1457
1458 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1459 {
1460         struct nfs4_file *fp = stp->st_stid.sc_file;
1461
1462         lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1463
1464         if (list_empty(&stp->st_perfile))
1465                 return false;
1466
1467         spin_lock(&fp->fi_lock);
1468         list_del_init(&stp->st_perfile);
1469         spin_unlock(&fp->fi_lock);
1470         list_del(&stp->st_perstateowner);
1471         return true;
1472 }
1473
1474 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1475 {
1476         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1477
1478         put_clnt_odstate(stp->st_clnt_odstate);
1479         release_all_access(stp);
1480         if (stp->st_stateowner)
1481                 nfs4_put_stateowner(stp->st_stateowner);
1482         WARN_ON(!list_empty(&stid->sc_cp_list));
1483         kmem_cache_free(stateid_slab, stid);
1484 }
1485
1486 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1487 {
1488         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1489         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1490         struct nfsd_file *nf;
1491
1492         nf = find_any_file(stp->st_stid.sc_file);
1493         if (nf) {
1494                 get_file(nf->nf_file);
1495                 filp_close(nf->nf_file, (fl_owner_t)lo);
1496                 nfsd_file_put(nf);
1497         }
1498         nfs4_free_ol_stateid(stid);
1499 }
1500
1501 /*
1502  * Put the persistent reference to an already unhashed generic stateid, while
1503  * holding the cl_lock. If it's the last reference, then put it onto the
1504  * reaplist for later destruction.
1505  */
1506 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1507                                        struct list_head *reaplist)
1508 {
1509         struct nfs4_stid *s = &stp->st_stid;
1510         struct nfs4_client *clp = s->sc_client;
1511
1512         lockdep_assert_held(&clp->cl_lock);
1513
1514         WARN_ON_ONCE(!list_empty(&stp->st_locks));
1515
1516         if (!refcount_dec_and_test(&s->sc_count)) {
1517                 wake_up_all(&close_wq);
1518                 return;
1519         }
1520
1521         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1522         list_add(&stp->st_locks, reaplist);
1523 }
1524
1525 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1526 {
1527         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1528
1529         if (!unhash_ol_stateid(stp))
1530                 return false;
1531         list_del_init(&stp->st_locks);
1532         nfs4_unhash_stid(&stp->st_stid);
1533         return true;
1534 }
1535
1536 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1537 {
1538         struct nfs4_client *clp = stp->st_stid.sc_client;
1539         bool unhashed;
1540
1541         spin_lock(&clp->cl_lock);
1542         unhashed = unhash_lock_stateid(stp);
1543         spin_unlock(&clp->cl_lock);
1544         if (unhashed)
1545                 nfs4_put_stid(&stp->st_stid);
1546 }
1547
1548 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1549 {
1550         struct nfs4_client *clp = lo->lo_owner.so_client;
1551
1552         lockdep_assert_held(&clp->cl_lock);
1553
1554         list_del_init(&lo->lo_owner.so_strhash);
1555 }
1556
1557 /*
1558  * Free a list of generic stateids that were collected earlier after being
1559  * fully unhashed.
1560  */
1561 static void
1562 free_ol_stateid_reaplist(struct list_head *reaplist)
1563 {
1564         struct nfs4_ol_stateid *stp;
1565         struct nfs4_file *fp;
1566
1567         might_sleep();
1568
1569         while (!list_empty(reaplist)) {
1570                 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1571                                        st_locks);
1572                 list_del(&stp->st_locks);
1573                 fp = stp->st_stid.sc_file;
1574                 stp->st_stid.sc_free(&stp->st_stid);
1575                 if (fp)
1576                         put_nfs4_file(fp);
1577         }
1578 }
1579
1580 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1581                                        struct list_head *reaplist)
1582 {
1583         struct nfs4_ol_stateid *stp;
1584
1585         lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1586
1587         while (!list_empty(&open_stp->st_locks)) {
1588                 stp = list_entry(open_stp->st_locks.next,
1589                                 struct nfs4_ol_stateid, st_locks);
1590                 WARN_ON(!unhash_lock_stateid(stp));
1591                 put_ol_stateid_locked(stp, reaplist);
1592         }
1593 }
1594
1595 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1596                                 struct list_head *reaplist)
1597 {
1598         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1599
1600         if (!unhash_ol_stateid(stp))
1601                 return false;
1602         release_open_stateid_locks(stp, reaplist);
1603         return true;
1604 }
1605
1606 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1607 {
1608         LIST_HEAD(reaplist);
1609
1610         spin_lock(&stp->st_stid.sc_client->cl_lock);
1611         if (unhash_open_stateid(stp, &reaplist))
1612                 put_ol_stateid_locked(stp, &reaplist);
1613         spin_unlock(&stp->st_stid.sc_client->cl_lock);
1614         free_ol_stateid_reaplist(&reaplist);
1615 }
1616
1617 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1618 {
1619         struct nfs4_client *clp = oo->oo_owner.so_client;
1620
1621         lockdep_assert_held(&clp->cl_lock);
1622
1623         list_del_init(&oo->oo_owner.so_strhash);
1624         list_del_init(&oo->oo_perclient);
1625 }
1626
1627 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1628 {
1629         struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1630                                           nfsd_net_id);
1631         struct nfs4_ol_stateid *s;
1632
1633         spin_lock(&nn->client_lock);
1634         s = oo->oo_last_closed_stid;
1635         if (s) {
1636                 list_del_init(&oo->oo_close_lru);
1637                 oo->oo_last_closed_stid = NULL;
1638         }
1639         spin_unlock(&nn->client_lock);
1640         if (s)
1641                 nfs4_put_stid(&s->st_stid);
1642 }
1643
1644 static void release_openowner(struct nfs4_openowner *oo)
1645 {
1646         struct nfs4_ol_stateid *stp;
1647         struct nfs4_client *clp = oo->oo_owner.so_client;
1648         struct list_head reaplist;
1649
1650         INIT_LIST_HEAD(&reaplist);
1651
1652         spin_lock(&clp->cl_lock);
1653         unhash_openowner_locked(oo);
1654         while (!list_empty(&oo->oo_owner.so_stateids)) {
1655                 stp = list_first_entry(&oo->oo_owner.so_stateids,
1656                                 struct nfs4_ol_stateid, st_perstateowner);
1657                 if (unhash_open_stateid(stp, &reaplist))
1658                         put_ol_stateid_locked(stp, &reaplist);
1659         }
1660         spin_unlock(&clp->cl_lock);
1661         free_ol_stateid_reaplist(&reaplist);
1662         release_last_closed_stateid(oo);
1663         nfs4_put_stateowner(&oo->oo_owner);
1664 }
1665
1666 static inline int
1667 hash_sessionid(struct nfs4_sessionid *sessionid)
1668 {
1669         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1670
1671         return sid->sequence % SESSION_HASH_SIZE;
1672 }
1673
1674 #ifdef CONFIG_SUNRPC_DEBUG
1675 static inline void
1676 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1677 {
1678         u32 *ptr = (u32 *)(&sessionid->data[0]);
1679         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1680 }
1681 #else
1682 static inline void
1683 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1684 {
1685 }
1686 #endif
1687
1688 /*
1689  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1690  * won't be used for replay.
1691  */
1692 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1693 {
1694         struct nfs4_stateowner *so = cstate->replay_owner;
1695
1696         if (nfserr == nfserr_replay_me)
1697                 return;
1698
1699         if (!seqid_mutating_err(ntohl(nfserr))) {
1700                 nfsd4_cstate_clear_replay(cstate);
1701                 return;
1702         }
1703         if (!so)
1704                 return;
1705         if (so->so_is_open_owner)
1706                 release_last_closed_stateid(openowner(so));
1707         so->so_seqid++;
1708         return;
1709 }
1710
1711 static void
1712 gen_sessionid(struct nfsd4_session *ses)
1713 {
1714         struct nfs4_client *clp = ses->se_client;
1715         struct nfsd4_sessionid *sid;
1716
1717         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1718         sid->clientid = clp->cl_clientid;
1719         sid->sequence = current_sessionid++;
1720         sid->reserved = 0;
1721 }
1722
1723 /*
1724  * The protocol defines ca_maxresponssize_cached to include the size of
1725  * the rpc header, but all we need to cache is the data starting after
1726  * the end of the initial SEQUENCE operation--the rest we regenerate
1727  * each time.  Therefore we can advertise a ca_maxresponssize_cached
1728  * value that is the number of bytes in our cache plus a few additional
1729  * bytes.  In order to stay on the safe side, and not promise more than
1730  * we can cache, those additional bytes must be the minimum possible: 24
1731  * bytes of rpc header (xid through accept state, with AUTH_NULL
1732  * verifier), 12 for the compound header (with zero-length tag), and 44
1733  * for the SEQUENCE op response:
1734  */
1735 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
1736
1737 static void
1738 free_session_slots(struct nfsd4_session *ses)
1739 {
1740         int i;
1741
1742         for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1743                 free_svc_cred(&ses->se_slots[i]->sl_cred);
1744                 kfree(ses->se_slots[i]);
1745         }
1746 }
1747
1748 /*
1749  * We don't actually need to cache the rpc and session headers, so we
1750  * can allocate a little less for each slot:
1751  */
1752 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1753 {
1754         u32 size;
1755
1756         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1757                 size = 0;
1758         else
1759                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1760         return size + sizeof(struct nfsd4_slot);
1761 }
1762
1763 /*
1764  * XXX: If we run out of reserved DRC memory we could (up to a point)
1765  * re-negotiate active sessions and reduce their slot usage to make
1766  * room for new connections. For now we just fail the create session.
1767  */
1768 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1769 {
1770         u32 slotsize = slot_bytes(ca);
1771         u32 num = ca->maxreqs;
1772         unsigned long avail, total_avail;
1773         unsigned int scale_factor;
1774
1775         spin_lock(&nfsd_drc_lock);
1776         if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1777                 total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1778         else
1779                 /* We have handed out more space than we chose in
1780                  * set_max_drc() to allow.  That isn't really a
1781                  * problem as long as that doesn't make us think we
1782                  * have lots more due to integer overflow.
1783                  */
1784                 total_avail = 0;
1785         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1786         /*
1787          * Never use more than a fraction of the remaining memory,
1788          * unless it's the only way to give this client a slot.
1789          * The chosen fraction is either 1/8 or 1/number of threads,
1790          * whichever is smaller.  This ensures there are adequate
1791          * slots to support multiple clients per thread.
1792          * Give the client one slot even if that would require
1793          * over-allocation--it is better than failure.
1794          */
1795         scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1796
1797         avail = clamp_t(unsigned long, avail, slotsize,
1798                         total_avail/scale_factor);
1799         num = min_t(int, num, avail / slotsize);
1800         num = max_t(int, num, 1);
1801         nfsd_drc_mem_used += num * slotsize;
1802         spin_unlock(&nfsd_drc_lock);
1803
1804         return num;
1805 }
1806
1807 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1808 {
1809         int slotsize = slot_bytes(ca);
1810
1811         spin_lock(&nfsd_drc_lock);
1812         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1813         spin_unlock(&nfsd_drc_lock);
1814 }
1815
1816 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1817                                            struct nfsd4_channel_attrs *battrs)
1818 {
1819         int numslots = fattrs->maxreqs;
1820         int slotsize = slot_bytes(fattrs);
1821         struct nfsd4_session *new;
1822         int mem, i;
1823
1824         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1825                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
1826         mem = numslots * sizeof(struct nfsd4_slot *);
1827
1828         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1829         if (!new)
1830                 return NULL;
1831         /* allocate each struct nfsd4_slot and data cache in one piece */
1832         for (i = 0; i < numslots; i++) {
1833                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1834                 if (!new->se_slots[i])
1835                         goto out_free;
1836         }
1837
1838         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1839         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1840
1841         return new;
1842 out_free:
1843         while (i--)
1844                 kfree(new->se_slots[i]);
1845         kfree(new);
1846         return NULL;
1847 }
1848
1849 static void free_conn(struct nfsd4_conn *c)
1850 {
1851         svc_xprt_put(c->cn_xprt);
1852         kfree(c);
1853 }
1854
1855 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1856 {
1857         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1858         struct nfs4_client *clp = c->cn_session->se_client;
1859
1860         trace_nfsd_cb_lost(clp);
1861
1862         spin_lock(&clp->cl_lock);
1863         if (!list_empty(&c->cn_persession)) {
1864                 list_del(&c->cn_persession);
1865                 free_conn(c);
1866         }
1867         nfsd4_probe_callback(clp);
1868         spin_unlock(&clp->cl_lock);
1869 }
1870
1871 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1872 {
1873         struct nfsd4_conn *conn;
1874
1875         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1876         if (!conn)
1877                 return NULL;
1878         svc_xprt_get(rqstp->rq_xprt);
1879         conn->cn_xprt = rqstp->rq_xprt;
1880         conn->cn_flags = flags;
1881         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1882         return conn;
1883 }
1884
1885 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1886 {
1887         conn->cn_session = ses;
1888         list_add(&conn->cn_persession, &ses->se_conns);
1889 }
1890
1891 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1892 {
1893         struct nfs4_client *clp = ses->se_client;
1894
1895         spin_lock(&clp->cl_lock);
1896         __nfsd4_hash_conn(conn, ses);
1897         spin_unlock(&clp->cl_lock);
1898 }
1899
1900 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1901 {
1902         conn->cn_xpt_user.callback = nfsd4_conn_lost;
1903         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1904 }
1905
1906 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1907 {
1908         int ret;
1909
1910         nfsd4_hash_conn(conn, ses);
1911         ret = nfsd4_register_conn(conn);
1912         if (ret)
1913                 /* oops; xprt is already down: */
1914                 nfsd4_conn_lost(&conn->cn_xpt_user);
1915         /* We may have gained or lost a callback channel: */
1916         nfsd4_probe_callback_sync(ses->se_client);
1917 }
1918
1919 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1920 {
1921         u32 dir = NFS4_CDFC4_FORE;
1922
1923         if (cses->flags & SESSION4_BACK_CHAN)
1924                 dir |= NFS4_CDFC4_BACK;
1925         return alloc_conn(rqstp, dir);
1926 }
1927
1928 /* must be called under client_lock */
1929 static void nfsd4_del_conns(struct nfsd4_session *s)
1930 {
1931         struct nfs4_client *clp = s->se_client;
1932         struct nfsd4_conn *c;
1933
1934         spin_lock(&clp->cl_lock);
1935         while (!list_empty(&s->se_conns)) {
1936                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1937                 list_del_init(&c->cn_persession);
1938                 spin_unlock(&clp->cl_lock);
1939
1940                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1941                 free_conn(c);
1942
1943                 spin_lock(&clp->cl_lock);
1944         }
1945         spin_unlock(&clp->cl_lock);
1946 }
1947
1948 static void __free_session(struct nfsd4_session *ses)
1949 {
1950         free_session_slots(ses);
1951         kfree(ses);
1952 }
1953
1954 static void free_session(struct nfsd4_session *ses)
1955 {
1956         nfsd4_del_conns(ses);
1957         nfsd4_put_drc_mem(&ses->se_fchannel);
1958         __free_session(ses);
1959 }
1960
1961 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1962 {
1963         int idx;
1964         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1965
1966         new->se_client = clp;
1967         gen_sessionid(new);
1968
1969         INIT_LIST_HEAD(&new->se_conns);
1970
1971         new->se_cb_seq_nr = 1;
1972         new->se_flags = cses->flags;
1973         new->se_cb_prog = cses->callback_prog;
1974         new->se_cb_sec = cses->cb_sec;
1975         atomic_set(&new->se_ref, 0);
1976         idx = hash_sessionid(&new->se_sessionid);
1977         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1978         spin_lock(&clp->cl_lock);
1979         list_add(&new->se_perclnt, &clp->cl_sessions);
1980         spin_unlock(&clp->cl_lock);
1981
1982         {
1983                 struct sockaddr *sa = svc_addr(rqstp);
1984                 /*
1985                  * This is a little silly; with sessions there's no real
1986                  * use for the callback address.  Use the peer address
1987                  * as a reasonable default for now, but consider fixing
1988                  * the rpc client not to require an address in the
1989                  * future:
1990                  */
1991                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1992                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1993         }
1994 }
1995
1996 /* caller must hold client_lock */
1997 static struct nfsd4_session *
1998 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1999 {
2000         struct nfsd4_session *elem;
2001         int idx;
2002         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2003
2004         lockdep_assert_held(&nn->client_lock);
2005
2006         dump_sessionid(__func__, sessionid);
2007         idx = hash_sessionid(sessionid);
2008         /* Search in the appropriate list */
2009         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
2010                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
2011                             NFS4_MAX_SESSIONID_LEN)) {
2012                         return elem;
2013                 }
2014         }
2015
2016         dprintk("%s: session not found\n", __func__);
2017         return NULL;
2018 }
2019
2020 static struct nfsd4_session *
2021 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
2022                 __be32 *ret)
2023 {
2024         struct nfsd4_session *session;
2025         __be32 status = nfserr_badsession;
2026
2027         session = __find_in_sessionid_hashtbl(sessionid, net);
2028         if (!session)
2029                 goto out;
2030         status = nfsd4_get_session_locked(session);
2031         if (status)
2032                 session = NULL;
2033 out:
2034         *ret = status;
2035         return session;
2036 }
2037
2038 /* caller must hold client_lock */
2039 static void
2040 unhash_session(struct nfsd4_session *ses)
2041 {
2042         struct nfs4_client *clp = ses->se_client;
2043         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2044
2045         lockdep_assert_held(&nn->client_lock);
2046
2047         list_del(&ses->se_hash);
2048         spin_lock(&ses->se_client->cl_lock);
2049         list_del(&ses->se_perclnt);
2050         spin_unlock(&ses->se_client->cl_lock);
2051 }
2052
2053 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
2054 static int
2055 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
2056 {
2057         /*
2058          * We're assuming the clid was not given out from a boot
2059          * precisely 2^32 (about 136 years) before this one.  That seems
2060          * a safe assumption:
2061          */
2062         if (clid->cl_boot == (u32)nn->boot_time)
2063                 return 0;
2064         trace_nfsd_clid_stale(clid);
2065         return 1;
2066 }
2067
2068 /*
2069  * XXX Should we use a slab cache ?
2070  * This type of memory management is somewhat inefficient, but we use it
2071  * anyway since SETCLIENTID is not a common operation.
2072  */
2073 static struct nfs4_client *alloc_client(struct xdr_netobj name,
2074                                 struct nfsd_net *nn)
2075 {
2076         struct nfs4_client *clp;
2077         int i;
2078
2079         if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) {
2080                 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
2081                 return NULL;
2082         }
2083         clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
2084         if (clp == NULL)
2085                 return NULL;
2086         xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
2087         if (clp->cl_name.data == NULL)
2088                 goto err_no_name;
2089         clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
2090                                                  sizeof(struct list_head),
2091                                                  GFP_KERNEL);
2092         if (!clp->cl_ownerstr_hashtbl)
2093                 goto err_no_hashtbl;
2094         for (i = 0; i < OWNER_HASH_SIZE; i++)
2095                 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
2096         INIT_LIST_HEAD(&clp->cl_sessions);
2097         idr_init(&clp->cl_stateids);
2098         atomic_set(&clp->cl_rpc_users, 0);
2099         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
2100         clp->cl_state = NFSD4_ACTIVE;
2101         atomic_inc(&nn->nfs4_client_count);
2102         atomic_set(&clp->cl_delegs_in_recall, 0);
2103         INIT_LIST_HEAD(&clp->cl_idhash);
2104         INIT_LIST_HEAD(&clp->cl_openowners);
2105         INIT_LIST_HEAD(&clp->cl_delegations);
2106         INIT_LIST_HEAD(&clp->cl_lru);
2107         INIT_LIST_HEAD(&clp->cl_revoked);
2108 #ifdef CONFIG_NFSD_PNFS
2109         INIT_LIST_HEAD(&clp->cl_lo_states);
2110 #endif
2111         INIT_LIST_HEAD(&clp->async_copies);
2112         spin_lock_init(&clp->async_lock);
2113         spin_lock_init(&clp->cl_lock);
2114         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
2115         return clp;
2116 err_no_hashtbl:
2117         kfree(clp->cl_name.data);
2118 err_no_name:
2119         kmem_cache_free(client_slab, clp);
2120         return NULL;
2121 }
2122
2123 static void __free_client(struct kref *k)
2124 {
2125         struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2126         struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2127
2128         free_svc_cred(&clp->cl_cred);
2129         kfree(clp->cl_ownerstr_hashtbl);
2130         kfree(clp->cl_name.data);
2131         kfree(clp->cl_nii_domain.data);
2132         kfree(clp->cl_nii_name.data);
2133         idr_destroy(&clp->cl_stateids);
2134         kmem_cache_free(client_slab, clp);
2135 }
2136
2137 static void drop_client(struct nfs4_client *clp)
2138 {
2139         kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
2140 }
2141
2142 static void
2143 free_client(struct nfs4_client *clp)
2144 {
2145         while (!list_empty(&clp->cl_sessions)) {
2146                 struct nfsd4_session *ses;
2147                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2148                                 se_perclnt);
2149                 list_del(&ses->se_perclnt);
2150                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
2151                 free_session(ses);
2152         }
2153         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2154         if (clp->cl_nfsd_dentry) {
2155                 nfsd_client_rmdir(clp->cl_nfsd_dentry);
2156                 clp->cl_nfsd_dentry = NULL;
2157                 wake_up_all(&expiry_wq);
2158         }
2159         drop_client(clp);
2160 }
2161
2162 /* must be called under the client_lock */
2163 static void
2164 unhash_client_locked(struct nfs4_client *clp)
2165 {
2166         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2167         struct nfsd4_session *ses;
2168
2169         lockdep_assert_held(&nn->client_lock);
2170
2171         /* Mark the client as expired! */
2172         clp->cl_time = 0;
2173         /* Make it invisible */
2174         if (!list_empty(&clp->cl_idhash)) {
2175                 list_del_init(&clp->cl_idhash);
2176                 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2177                         rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2178                 else
2179                         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2180         }
2181         list_del_init(&clp->cl_lru);
2182         spin_lock(&clp->cl_lock);
2183         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2184                 list_del_init(&ses->se_hash);
2185         spin_unlock(&clp->cl_lock);
2186 }
2187
2188 static void
2189 unhash_client(struct nfs4_client *clp)
2190 {
2191         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2192
2193         spin_lock(&nn->client_lock);
2194         unhash_client_locked(clp);
2195         spin_unlock(&nn->client_lock);
2196 }
2197
2198 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2199 {
2200         if (atomic_read(&clp->cl_rpc_users))
2201                 return nfserr_jukebox;
2202         unhash_client_locked(clp);
2203         return nfs_ok;
2204 }
2205
2206 static void
2207 __destroy_client(struct nfs4_client *clp)
2208 {
2209         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2210         int i;
2211         struct nfs4_openowner *oo;
2212         struct nfs4_delegation *dp;
2213         struct list_head reaplist;
2214
2215         INIT_LIST_HEAD(&reaplist);
2216         spin_lock(&state_lock);
2217         while (!list_empty(&clp->cl_delegations)) {
2218                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2219                 WARN_ON(!unhash_delegation_locked(dp));
2220                 list_add(&dp->dl_recall_lru, &reaplist);
2221         }
2222         spin_unlock(&state_lock);
2223         while (!list_empty(&reaplist)) {
2224                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2225                 list_del_init(&dp->dl_recall_lru);
2226                 destroy_unhashed_deleg(dp);
2227         }
2228         while (!list_empty(&clp->cl_revoked)) {
2229                 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2230                 list_del_init(&dp->dl_recall_lru);
2231                 nfs4_put_stid(&dp->dl_stid);
2232         }
2233         while (!list_empty(&clp->cl_openowners)) {
2234                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2235                 nfs4_get_stateowner(&oo->oo_owner);
2236                 release_openowner(oo);
2237         }
2238         for (i = 0; i < OWNER_HASH_SIZE; i++) {
2239                 struct nfs4_stateowner *so, *tmp;
2240
2241                 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2242                                          so_strhash) {
2243                         /* Should be no openowners at this point */
2244                         WARN_ON_ONCE(so->so_is_open_owner);
2245                         remove_blocked_locks(lockowner(so));
2246                 }
2247         }
2248         nfsd4_return_all_client_layouts(clp);
2249         nfsd4_shutdown_copy(clp);
2250         nfsd4_shutdown_callback(clp);
2251         if (clp->cl_cb_conn.cb_xprt)
2252                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2253         atomic_add_unless(&nn->nfs4_client_count, -1, 0);
2254         nfsd4_dec_courtesy_client_count(nn, clp);
2255         free_client(clp);
2256         wake_up_all(&expiry_wq);
2257 }
2258
2259 static void
2260 destroy_client(struct nfs4_client *clp)
2261 {
2262         unhash_client(clp);
2263         __destroy_client(clp);
2264 }
2265
2266 static void inc_reclaim_complete(struct nfs4_client *clp)
2267 {
2268         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2269
2270         if (!nn->track_reclaim_completes)
2271                 return;
2272         if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2273                 return;
2274         if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2275                         nn->reclaim_str_hashtbl_size) {
2276                 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2277                                 clp->net->ns.inum);
2278                 nfsd4_end_grace(nn);
2279         }
2280 }
2281
2282 static void expire_client(struct nfs4_client *clp)
2283 {
2284         unhash_client(clp);
2285         nfsd4_client_record_remove(clp);
2286         __destroy_client(clp);
2287 }
2288
2289 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2290 {
2291         memcpy(target->cl_verifier.data, source->data,
2292                         sizeof(target->cl_verifier.data));
2293 }
2294
2295 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2296 {
2297         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2298         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2299 }
2300
2301 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2302 {
2303         target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2304         target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2305                                                                 GFP_KERNEL);
2306         target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2307         if ((source->cr_principal && !target->cr_principal) ||
2308             (source->cr_raw_principal && !target->cr_raw_principal) ||
2309             (source->cr_targ_princ && !target->cr_targ_princ))
2310                 return -ENOMEM;
2311
2312         target->cr_flavor = source->cr_flavor;
2313         target->cr_uid = source->cr_uid;
2314         target->cr_gid = source->cr_gid;
2315         target->cr_group_info = source->cr_group_info;
2316         get_group_info(target->cr_group_info);
2317         target->cr_gss_mech = source->cr_gss_mech;
2318         if (source->cr_gss_mech)
2319                 gss_mech_get(source->cr_gss_mech);
2320         return 0;
2321 }
2322
2323 static int
2324 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2325 {
2326         if (o1->len < o2->len)
2327                 return -1;
2328         if (o1->len > o2->len)
2329                 return 1;
2330         return memcmp(o1->data, o2->data, o1->len);
2331 }
2332
2333 static int
2334 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2335 {
2336         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2337 }
2338
2339 static int
2340 same_clid(clientid_t *cl1, clientid_t *cl2)
2341 {
2342         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2343 }
2344
2345 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2346 {
2347         int i;
2348
2349         if (g1->ngroups != g2->ngroups)
2350                 return false;
2351         for (i=0; i<g1->ngroups; i++)
2352                 if (!gid_eq(g1->gid[i], g2->gid[i]))
2353                         return false;
2354         return true;
2355 }
2356
2357 /*
2358  * RFC 3530 language requires clid_inuse be returned when the
2359  * "principal" associated with a requests differs from that previously
2360  * used.  We use uid, gid's, and gss principal string as our best
2361  * approximation.  We also don't want to allow non-gss use of a client
2362  * established using gss: in theory cr_principal should catch that
2363  * change, but in practice cr_principal can be null even in the gss case
2364  * since gssd doesn't always pass down a principal string.
2365  */
2366 static bool is_gss_cred(struct svc_cred *cr)
2367 {
2368         /* Is cr_flavor one of the gss "pseudoflavors"?: */
2369         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2370 }
2371
2372
2373 static bool
2374 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2375 {
2376         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2377                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2378                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2379                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2380                 return false;
2381         /* XXX: check that cr_targ_princ fields match ? */
2382         if (cr1->cr_principal == cr2->cr_principal)
2383                 return true;
2384         if (!cr1->cr_principal || !cr2->cr_principal)
2385                 return false;
2386         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2387 }
2388
2389 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2390 {
2391         struct svc_cred *cr = &rqstp->rq_cred;
2392         u32 service;
2393
2394         if (!cr->cr_gss_mech)
2395                 return false;
2396         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2397         return service == RPC_GSS_SVC_INTEGRITY ||
2398                service == RPC_GSS_SVC_PRIVACY;
2399 }
2400
2401 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2402 {
2403         struct svc_cred *cr = &rqstp->rq_cred;
2404
2405         if (!cl->cl_mach_cred)
2406                 return true;
2407         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2408                 return false;
2409         if (!svc_rqst_integrity_protected(rqstp))
2410                 return false;
2411         if (cl->cl_cred.cr_raw_principal)
2412                 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2413                                                 cr->cr_raw_principal);
2414         if (!cr->cr_principal)
2415                 return false;
2416         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2417 }
2418
2419 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2420 {
2421         __be32 verf[2];
2422
2423         /*
2424          * This is opaque to client, so no need to byte-swap. Use
2425          * __force to keep sparse happy
2426          */
2427         verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2428         verf[1] = (__force __be32)nn->clverifier_counter++;
2429         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2430 }
2431
2432 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2433 {
2434         clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2435         clp->cl_clientid.cl_id = nn->clientid_counter++;
2436         gen_confirm(clp, nn);
2437 }
2438
2439 static struct nfs4_stid *
2440 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2441 {
2442         struct nfs4_stid *ret;
2443
2444         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2445         if (!ret || !ret->sc_type)
2446                 return NULL;
2447         return ret;
2448 }
2449
2450 static struct nfs4_stid *
2451 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2452 {
2453         struct nfs4_stid *s;
2454
2455         spin_lock(&cl->cl_lock);
2456         s = find_stateid_locked(cl, t);
2457         if (s != NULL) {
2458                 if (typemask & s->sc_type)
2459                         refcount_inc(&s->sc_count);
2460                 else
2461                         s = NULL;
2462         }
2463         spin_unlock(&cl->cl_lock);
2464         return s;
2465 }
2466
2467 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2468 {
2469         struct nfsdfs_client *nc;
2470         nc = get_nfsdfs_client(inode);
2471         if (!nc)
2472                 return NULL;
2473         return container_of(nc, struct nfs4_client, cl_nfsdfs);
2474 }
2475
2476 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2477 {
2478         seq_printf(m, "\"");
2479         seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
2480         seq_printf(m, "\"");
2481 }
2482
2483 static const char *cb_state2str(int state)
2484 {
2485         switch (state) {
2486         case NFSD4_CB_UP:
2487                 return "UP";
2488         case NFSD4_CB_UNKNOWN:
2489                 return "UNKNOWN";
2490         case NFSD4_CB_DOWN:
2491                 return "DOWN";
2492         case NFSD4_CB_FAULT:
2493                 return "FAULT";
2494         }
2495         return "UNDEFINED";
2496 }
2497
2498 static int client_info_show(struct seq_file *m, void *v)
2499 {
2500         struct inode *inode = file_inode(m->file);
2501         struct nfs4_client *clp;
2502         u64 clid;
2503
2504         clp = get_nfsdfs_clp(inode);
2505         if (!clp)
2506                 return -ENXIO;
2507         memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2508         seq_printf(m, "clientid: 0x%llx\n", clid);
2509         seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2510
2511         if (clp->cl_state == NFSD4_COURTESY)
2512                 seq_puts(m, "status: courtesy\n");
2513         else if (clp->cl_state == NFSD4_EXPIRABLE)
2514                 seq_puts(m, "status: expirable\n");
2515         else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2516                 seq_puts(m, "status: confirmed\n");
2517         else
2518                 seq_puts(m, "status: unconfirmed\n");
2519         seq_printf(m, "seconds from last renew: %lld\n",
2520                 ktime_get_boottime_seconds() - clp->cl_time);
2521         seq_printf(m, "name: ");
2522         seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2523         seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2524         if (clp->cl_nii_domain.data) {
2525                 seq_printf(m, "Implementation domain: ");
2526                 seq_quote_mem(m, clp->cl_nii_domain.data,
2527                                         clp->cl_nii_domain.len);
2528                 seq_printf(m, "\nImplementation name: ");
2529                 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2530                 seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2531                         clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2532         }
2533         seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
2534         seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
2535         drop_client(clp);
2536
2537         return 0;
2538 }
2539
2540 DEFINE_SHOW_ATTRIBUTE(client_info);
2541
2542 static void *states_start(struct seq_file *s, loff_t *pos)
2543         __acquires(&clp->cl_lock)
2544 {
2545         struct nfs4_client *clp = s->private;
2546         unsigned long id = *pos;
2547         void *ret;
2548
2549         spin_lock(&clp->cl_lock);
2550         ret = idr_get_next_ul(&clp->cl_stateids, &id);
2551         *pos = id;
2552         return ret;
2553 }
2554
2555 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2556 {
2557         struct nfs4_client *clp = s->private;
2558         unsigned long id = *pos;
2559         void *ret;
2560
2561         id = *pos;
2562         id++;
2563         ret = idr_get_next_ul(&clp->cl_stateids, &id);
2564         *pos = id;
2565         return ret;
2566 }
2567
2568 static void states_stop(struct seq_file *s, void *v)
2569         __releases(&clp->cl_lock)
2570 {
2571         struct nfs4_client *clp = s->private;
2572
2573         spin_unlock(&clp->cl_lock);
2574 }
2575
2576 static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2577 {
2578          seq_printf(s, "filename: \"%pD2\"", f->nf_file);
2579 }
2580
2581 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2582 {
2583         struct inode *inode = file_inode(f->nf_file);
2584
2585         seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2586                                         MAJOR(inode->i_sb->s_dev),
2587                                          MINOR(inode->i_sb->s_dev),
2588                                          inode->i_ino);
2589 }
2590
2591 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2592 {
2593         seq_printf(s, "owner: ");
2594         seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2595 }
2596
2597 static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2598 {
2599         seq_printf(s, "0x%.8x", stid->si_generation);
2600         seq_printf(s, "%12phN", &stid->si_opaque);
2601 }
2602
2603 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2604 {
2605         struct nfs4_ol_stateid *ols;
2606         struct nfs4_file *nf;
2607         struct nfsd_file *file;
2608         struct nfs4_stateowner *oo;
2609         unsigned int access, deny;
2610
2611         if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
2612                 return 0; /* XXX: or SEQ_SKIP? */
2613         ols = openlockstateid(st);
2614         oo = ols->st_stateowner;
2615         nf = st->sc_file;
2616         file = find_any_file(nf);
2617         if (!file)
2618                 return 0;
2619
2620         seq_printf(s, "- ");
2621         nfs4_show_stateid(s, &st->sc_stateid);
2622         seq_printf(s, ": { type: open, ");
2623
2624         access = bmap_to_share_mode(ols->st_access_bmap);
2625         deny   = bmap_to_share_mode(ols->st_deny_bmap);
2626
2627         seq_printf(s, "access: %s%s, ",
2628                 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2629                 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2630         seq_printf(s, "deny: %s%s, ",
2631                 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2632                 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2633
2634         nfs4_show_superblock(s, file);
2635         seq_printf(s, ", ");
2636         nfs4_show_fname(s, file);
2637         seq_printf(s, ", ");
2638         nfs4_show_owner(s, oo);
2639         seq_printf(s, " }\n");
2640         nfsd_file_put(file);
2641
2642         return 0;
2643 }
2644
2645 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2646 {
2647         struct nfs4_ol_stateid *ols;
2648         struct nfs4_file *nf;
2649         struct nfsd_file *file;
2650         struct nfs4_stateowner *oo;
2651
2652         ols = openlockstateid(st);
2653         oo = ols->st_stateowner;
2654         nf = st->sc_file;
2655         file = find_any_file(nf);
2656         if (!file)
2657                 return 0;
2658
2659         seq_printf(s, "- ");
2660         nfs4_show_stateid(s, &st->sc_stateid);
2661         seq_printf(s, ": { type: lock, ");
2662
2663         /*
2664          * Note: a lock stateid isn't really the same thing as a lock,
2665          * it's the locking state held by one owner on a file, and there
2666          * may be multiple (or no) lock ranges associated with it.
2667          * (Same for the matter is true of open stateids.)
2668          */
2669
2670         nfs4_show_superblock(s, file);
2671         /* XXX: open stateid? */
2672         seq_printf(s, ", ");
2673         nfs4_show_fname(s, file);
2674         seq_printf(s, ", ");
2675         nfs4_show_owner(s, oo);
2676         seq_printf(s, " }\n");
2677         nfsd_file_put(file);
2678
2679         return 0;
2680 }
2681
2682 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2683 {
2684         struct nfs4_delegation *ds;
2685         struct nfs4_file *nf;
2686         struct nfsd_file *file;
2687
2688         ds = delegstateid(st);
2689         nf = st->sc_file;
2690         file = find_deleg_file(nf);
2691         if (!file)
2692                 return 0;
2693
2694         seq_printf(s, "- ");
2695         nfs4_show_stateid(s, &st->sc_stateid);
2696         seq_printf(s, ": { type: deleg, ");
2697
2698         /* Kinda dead code as long as we only support read delegs: */
2699         seq_printf(s, "access: %s, ",
2700                 ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2701
2702         /* XXX: lease time, whether it's being recalled. */
2703
2704         nfs4_show_superblock(s, file);
2705         seq_printf(s, ", ");
2706         nfs4_show_fname(s, file);
2707         seq_printf(s, " }\n");
2708         nfsd_file_put(file);
2709
2710         return 0;
2711 }
2712
2713 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2714 {
2715         struct nfs4_layout_stateid *ls;
2716         struct nfsd_file *file;
2717
2718         ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2719         file = ls->ls_file;
2720
2721         seq_printf(s, "- ");
2722         nfs4_show_stateid(s, &st->sc_stateid);
2723         seq_printf(s, ": { type: layout, ");
2724
2725         /* XXX: What else would be useful? */
2726
2727         nfs4_show_superblock(s, file);
2728         seq_printf(s, ", ");
2729         nfs4_show_fname(s, file);
2730         seq_printf(s, " }\n");
2731
2732         return 0;
2733 }
2734
2735 static int states_show(struct seq_file *s, void *v)
2736 {
2737         struct nfs4_stid *st = v;
2738
2739         switch (st->sc_type) {
2740         case NFS4_OPEN_STID:
2741                 return nfs4_show_open(s, st);
2742         case NFS4_LOCK_STID:
2743                 return nfs4_show_lock(s, st);
2744         case NFS4_DELEG_STID:
2745                 return nfs4_show_deleg(s, st);
2746         case NFS4_LAYOUT_STID:
2747                 return nfs4_show_layout(s, st);
2748         default:
2749                 return 0; /* XXX: or SEQ_SKIP? */
2750         }
2751         /* XXX: copy stateids? */
2752 }
2753
2754 static struct seq_operations states_seq_ops = {
2755         .start = states_start,
2756         .next = states_next,
2757         .stop = states_stop,
2758         .show = states_show
2759 };
2760
2761 static int client_states_open(struct inode *inode, struct file *file)
2762 {
2763         struct seq_file *s;
2764         struct nfs4_client *clp;
2765         int ret;
2766
2767         clp = get_nfsdfs_clp(inode);
2768         if (!clp)
2769                 return -ENXIO;
2770
2771         ret = seq_open(file, &states_seq_ops);
2772         if (ret)
2773                 return ret;
2774         s = file->private_data;
2775         s->private = clp;
2776         return 0;
2777 }
2778
2779 static int client_opens_release(struct inode *inode, struct file *file)
2780 {
2781         struct seq_file *m = file->private_data;
2782         struct nfs4_client *clp = m->private;
2783
2784         /* XXX: alternatively, we could get/drop in seq start/stop */
2785         drop_client(clp);
2786         return 0;
2787 }
2788
2789 static const struct file_operations client_states_fops = {
2790         .open           = client_states_open,
2791         .read           = seq_read,
2792         .llseek         = seq_lseek,
2793         .release        = client_opens_release,
2794 };
2795
2796 /*
2797  * Normally we refuse to destroy clients that are in use, but here the
2798  * administrator is telling us to just do it.  We also want to wait
2799  * so the caller has a guarantee that the client's locks are gone by
2800  * the time the write returns:
2801  */
2802 static void force_expire_client(struct nfs4_client *clp)
2803 {
2804         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2805         bool already_expired;
2806
2807         trace_nfsd_clid_admin_expired(&clp->cl_clientid);
2808
2809         spin_lock(&nn->client_lock);
2810         clp->cl_time = 0;
2811         spin_unlock(&nn->client_lock);
2812
2813         wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2814         spin_lock(&nn->client_lock);
2815         already_expired = list_empty(&clp->cl_lru);
2816         if (!already_expired)
2817                 unhash_client_locked(clp);
2818         spin_unlock(&nn->client_lock);
2819
2820         if (!already_expired)
2821                 expire_client(clp);
2822         else
2823                 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2824 }
2825
2826 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2827                                    size_t size, loff_t *pos)
2828 {
2829         char *data;
2830         struct nfs4_client *clp;
2831
2832         data = simple_transaction_get(file, buf, size);
2833         if (IS_ERR(data))
2834                 return PTR_ERR(data);
2835         if (size != 7 || 0 != memcmp(data, "expire\n", 7))
2836                 return -EINVAL;
2837         clp = get_nfsdfs_clp(file_inode(file));
2838         if (!clp)
2839                 return -ENXIO;
2840         force_expire_client(clp);
2841         drop_client(clp);
2842         return 7;
2843 }
2844
2845 static const struct file_operations client_ctl_fops = {
2846         .write          = client_ctl_write,
2847         .release        = simple_transaction_release,
2848 };
2849
2850 static const struct tree_descr client_files[] = {
2851         [0] = {"info", &client_info_fops, S_IRUSR},
2852         [1] = {"states", &client_states_fops, S_IRUSR},
2853         [2] = {"ctl", &client_ctl_fops, S_IWUSR},
2854         [3] = {""},
2855 };
2856
2857 static struct nfs4_client *create_client(struct xdr_netobj name,
2858                 struct svc_rqst *rqstp, nfs4_verifier *verf)
2859 {
2860         struct nfs4_client *clp;
2861         struct sockaddr *sa = svc_addr(rqstp);
2862         int ret;
2863         struct net *net = SVC_NET(rqstp);
2864         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2865         struct dentry *dentries[ARRAY_SIZE(client_files)];
2866
2867         clp = alloc_client(name, nn);
2868         if (clp == NULL)
2869                 return NULL;
2870
2871         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2872         if (ret) {
2873                 free_client(clp);
2874                 return NULL;
2875         }
2876         gen_clid(clp, nn);
2877         kref_init(&clp->cl_nfsdfs.cl_ref);
2878         nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2879         clp->cl_time = ktime_get_boottime_seconds();
2880         clear_bit(0, &clp->cl_cb_slot_busy);
2881         copy_verf(clp, verf);
2882         memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
2883         clp->cl_cb_session = NULL;
2884         clp->net = net;
2885         clp->cl_nfsd_dentry = nfsd_client_mkdir(
2886                 nn, &clp->cl_nfsdfs,
2887                 clp->cl_clientid.cl_id - nn->clientid_base,
2888                 client_files, dentries);
2889         clp->cl_nfsd_info_dentry = dentries[0];
2890         if (!clp->cl_nfsd_dentry) {
2891                 free_client(clp);
2892                 return NULL;
2893         }
2894         return clp;
2895 }
2896
2897 static void
2898 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2899 {
2900         struct rb_node **new = &(root->rb_node), *parent = NULL;
2901         struct nfs4_client *clp;
2902
2903         while (*new) {
2904                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2905                 parent = *new;
2906
2907                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2908                         new = &((*new)->rb_left);
2909                 else
2910                         new = &((*new)->rb_right);
2911         }
2912
2913         rb_link_node(&new_clp->cl_namenode, parent, new);
2914         rb_insert_color(&new_clp->cl_namenode, root);
2915 }
2916
2917 static struct nfs4_client *
2918 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2919 {
2920         int cmp;
2921         struct rb_node *node = root->rb_node;
2922         struct nfs4_client *clp;
2923
2924         while (node) {
2925                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2926                 cmp = compare_blob(&clp->cl_name, name);
2927                 if (cmp > 0)
2928                         node = node->rb_left;
2929                 else if (cmp < 0)
2930                         node = node->rb_right;
2931                 else
2932                         return clp;
2933         }
2934         return NULL;
2935 }
2936
2937 static void
2938 add_to_unconfirmed(struct nfs4_client *clp)
2939 {
2940         unsigned int idhashval;
2941         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2942
2943         lockdep_assert_held(&nn->client_lock);
2944
2945         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2946         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2947         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2948         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2949         renew_client_locked(clp);
2950 }
2951
2952 static void
2953 move_to_confirmed(struct nfs4_client *clp)
2954 {
2955         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2956         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2957
2958         lockdep_assert_held(&nn->client_lock);
2959
2960         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2961         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2962         add_clp_to_name_tree(clp, &nn->conf_name_tree);
2963         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2964         trace_nfsd_clid_confirmed(&clp->cl_clientid);
2965         renew_client_locked(clp);
2966 }
2967
2968 static struct nfs4_client *
2969 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2970 {
2971         struct nfs4_client *clp;
2972         unsigned int idhashval = clientid_hashval(clid->cl_id);
2973
2974         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2975                 if (same_clid(&clp->cl_clientid, clid)) {
2976                         if ((bool)clp->cl_minorversion != sessions)
2977                                 return NULL;
2978                         renew_client_locked(clp);
2979                         return clp;
2980                 }
2981         }
2982         return NULL;
2983 }
2984
2985 static struct nfs4_client *
2986 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2987 {
2988         struct list_head *tbl = nn->conf_id_hashtbl;
2989
2990         lockdep_assert_held(&nn->client_lock);
2991         return find_client_in_id_table(tbl, clid, sessions);
2992 }
2993
2994 static struct nfs4_client *
2995 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2996 {
2997         struct list_head *tbl = nn->unconf_id_hashtbl;
2998
2999         lockdep_assert_held(&nn->client_lock);
3000         return find_client_in_id_table(tbl, clid, sessions);
3001 }
3002
3003 static bool clp_used_exchangeid(struct nfs4_client *clp)
3004 {
3005         return clp->cl_exchange_flags != 0;
3006 }
3007
3008 static struct nfs4_client *
3009 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3010 {
3011         lockdep_assert_held(&nn->client_lock);
3012         return find_clp_in_name_tree(name, &nn->conf_name_tree);
3013 }
3014
3015 static struct nfs4_client *
3016 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3017 {
3018         lockdep_assert_held(&nn->client_lock);
3019         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
3020 }
3021
3022 static void
3023 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
3024 {
3025         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
3026         struct sockaddr *sa = svc_addr(rqstp);
3027         u32 scopeid = rpc_get_scope_id(sa);
3028         unsigned short expected_family;
3029
3030         /* Currently, we only support tcp and tcp6 for the callback channel */
3031         if (se->se_callback_netid_len == 3 &&
3032             !memcmp(se->se_callback_netid_val, "tcp", 3))
3033                 expected_family = AF_INET;
3034         else if (se->se_callback_netid_len == 4 &&
3035                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
3036                 expected_family = AF_INET6;
3037         else
3038                 goto out_err;
3039
3040         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
3041                                             se->se_callback_addr_len,
3042                                             (struct sockaddr *)&conn->cb_addr,
3043                                             sizeof(conn->cb_addr));
3044
3045         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
3046                 goto out_err;
3047
3048         if (conn->cb_addr.ss_family == AF_INET6)
3049                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
3050
3051         conn->cb_prog = se->se_callback_prog;
3052         conn->cb_ident = se->se_callback_ident;
3053         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
3054         trace_nfsd_cb_args(clp, conn);
3055         return;
3056 out_err:
3057         conn->cb_addr.ss_family = AF_UNSPEC;
3058         conn->cb_addrlen = 0;
3059         trace_nfsd_cb_nodelegs(clp);
3060         return;
3061 }
3062
3063 /*
3064  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
3065  */
3066 static void
3067 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
3068 {
3069         struct xdr_buf *buf = resp->xdr->buf;
3070         struct nfsd4_slot *slot = resp->cstate.slot;
3071         unsigned int base;
3072
3073         dprintk("--> %s slot %p\n", __func__, slot);
3074
3075         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
3076         slot->sl_opcnt = resp->opcnt;
3077         slot->sl_status = resp->cstate.status;
3078         free_svc_cred(&slot->sl_cred);
3079         copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
3080
3081         if (!nfsd4_cache_this(resp)) {
3082                 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
3083                 return;
3084         }
3085         slot->sl_flags |= NFSD4_SLOT_CACHED;
3086
3087         base = resp->cstate.data_offset;
3088         slot->sl_datalen = buf->len - base;
3089         if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
3090                 WARN(1, "%s: sessions DRC could not cache compound\n",
3091                      __func__);
3092         return;
3093 }
3094
3095 /*
3096  * Encode the replay sequence operation from the slot values.
3097  * If cachethis is FALSE encode the uncached rep error on the next
3098  * operation which sets resp->p and increments resp->opcnt for
3099  * nfs4svc_encode_compoundres.
3100  *
3101  */
3102 static __be32
3103 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
3104                           struct nfsd4_compoundres *resp)
3105 {
3106         struct nfsd4_op *op;
3107         struct nfsd4_slot *slot = resp->cstate.slot;
3108
3109         /* Encode the replayed sequence operation */
3110         op = &args->ops[resp->opcnt - 1];
3111         nfsd4_encode_operation(resp, op);
3112
3113         if (slot->sl_flags & NFSD4_SLOT_CACHED)
3114                 return op->status;
3115         if (args->opcnt == 1) {
3116                 /*
3117                  * The original operation wasn't a solo sequence--we
3118                  * always cache those--so this retry must not match the
3119                  * original:
3120                  */
3121                 op->status = nfserr_seq_false_retry;
3122         } else {
3123                 op = &args->ops[resp->opcnt++];
3124                 op->status = nfserr_retry_uncached_rep;
3125                 nfsd4_encode_operation(resp, op);
3126         }
3127         return op->status;
3128 }
3129
3130 /*
3131  * The sequence operation is not cached because we can use the slot and
3132  * session values.
3133  */
3134 static __be32
3135 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
3136                          struct nfsd4_sequence *seq)
3137 {
3138         struct nfsd4_slot *slot = resp->cstate.slot;
3139         struct xdr_stream *xdr = resp->xdr;
3140         __be32 *p;
3141         __be32 status;
3142
3143         dprintk("--> %s slot %p\n", __func__, slot);
3144
3145         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
3146         if (status)
3147                 return status;
3148
3149         p = xdr_reserve_space(xdr, slot->sl_datalen);
3150         if (!p) {
3151                 WARN_ON_ONCE(1);
3152                 return nfserr_serverfault;
3153         }
3154         xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
3155         xdr_commit_encode(xdr);
3156
3157         resp->opcnt = slot->sl_opcnt;
3158         return slot->sl_status;
3159 }
3160
3161 /*
3162  * Set the exchange_id flags returned by the server.
3163  */
3164 static void
3165 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3166 {
3167 #ifdef CONFIG_NFSD_PNFS
3168         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3169 #else
3170         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3171 #endif
3172
3173         /* Referrals are supported, Migration is not. */
3174         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3175
3176         /* set the wire flags to return to client. */
3177         clid->flags = new->cl_exchange_flags;
3178 }
3179
3180 static bool client_has_openowners(struct nfs4_client *clp)
3181 {
3182         struct nfs4_openowner *oo;
3183
3184         list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3185                 if (!list_empty(&oo->oo_owner.so_stateids))
3186                         return true;
3187         }
3188         return false;
3189 }
3190
3191 static bool client_has_state(struct nfs4_client *clp)
3192 {
3193         return client_has_openowners(clp)
3194 #ifdef CONFIG_NFSD_PNFS
3195                 || !list_empty(&clp->cl_lo_states)
3196 #endif
3197                 || !list_empty(&clp->cl_delegations)
3198                 || !list_empty(&clp->cl_sessions)
3199                 || !list_empty(&clp->async_copies);
3200 }
3201
3202 static __be32 copy_impl_id(struct nfs4_client *clp,
3203                                 struct nfsd4_exchange_id *exid)
3204 {
3205         if (!exid->nii_domain.data)
3206                 return 0;
3207         xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3208         if (!clp->cl_nii_domain.data)
3209                 return nfserr_jukebox;
3210         xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3211         if (!clp->cl_nii_name.data)
3212                 return nfserr_jukebox;
3213         clp->cl_nii_time = exid->nii_time;
3214         return 0;
3215 }
3216
3217 __be32
3218 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3219                 union nfsd4_op_u *u)
3220 {
3221         struct nfsd4_exchange_id *exid = &u->exchange_id;
3222         struct nfs4_client *conf, *new;
3223         struct nfs4_client *unconf = NULL;
3224         __be32 status;
3225         char                    addr_str[INET6_ADDRSTRLEN];
3226         nfs4_verifier           verf = exid->verifier;
3227         struct sockaddr         *sa = svc_addr(rqstp);
3228         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3229         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3230
3231         rpc_ntop(sa, addr_str, sizeof(addr_str));
3232         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3233                 "ip_addr=%s flags %x, spa_how %u\n",
3234                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
3235                 addr_str, exid->flags, exid->spa_how);
3236
3237         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3238                 return nfserr_inval;
3239
3240         new = create_client(exid->clname, rqstp, &verf);
3241         if (new == NULL)
3242                 return nfserr_jukebox;
3243         status = copy_impl_id(new, exid);
3244         if (status)
3245                 goto out_nolock;
3246
3247         switch (exid->spa_how) {
3248         case SP4_MACH_CRED:
3249                 exid->spo_must_enforce[0] = 0;
3250                 exid->spo_must_enforce[1] = (
3251                         1 << (OP_BIND_CONN_TO_SESSION - 32) |
3252                         1 << (OP_EXCHANGE_ID - 32) |
3253                         1 << (OP_CREATE_SESSION - 32) |
3254                         1 << (OP_DESTROY_SESSION - 32) |
3255                         1 << (OP_DESTROY_CLIENTID - 32));
3256
3257                 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3258                                         1 << (OP_OPEN_DOWNGRADE) |
3259                                         1 << (OP_LOCKU) |
3260                                         1 << (OP_DELEGRETURN));
3261
3262                 exid->spo_must_allow[1] &= (
3263                                         1 << (OP_TEST_STATEID - 32) |
3264                                         1 << (OP_FREE_STATEID - 32));
3265                 if (!svc_rqst_integrity_protected(rqstp)) {
3266                         status = nfserr_inval;
3267                         goto out_nolock;
3268                 }
3269                 /*
3270                  * Sometimes userspace doesn't give us a principal.
3271                  * Which is a bug, really.  Anyway, we can't enforce
3272                  * MACH_CRED in that case, better to give up now:
3273                  */
3274                 if (!new->cl_cred.cr_principal &&
3275                                         !new->cl_cred.cr_raw_principal) {
3276                         status = nfserr_serverfault;
3277                         goto out_nolock;
3278                 }
3279                 new->cl_mach_cred = true;
3280                 break;
3281         case SP4_NONE:
3282                 break;
3283         default:                                /* checked by xdr code */
3284                 WARN_ON_ONCE(1);
3285                 fallthrough;
3286         case SP4_SSV:
3287                 status = nfserr_encr_alg_unsupp;
3288                 goto out_nolock;
3289         }
3290
3291         /* Cases below refer to rfc 5661 section 18.35.4: */
3292         spin_lock(&nn->client_lock);
3293         conf = find_confirmed_client_by_name(&exid->clname, nn);
3294         if (conf) {
3295                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3296                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3297
3298                 if (update) {
3299                         if (!clp_used_exchangeid(conf)) { /* buggy client */
3300                                 status = nfserr_inval;
3301                                 goto out;
3302                         }
3303                         if (!nfsd4_mach_creds_match(conf, rqstp)) {
3304                                 status = nfserr_wrong_cred;
3305                                 goto out;
3306                         }
3307                         if (!creds_match) { /* case 9 */
3308                                 status = nfserr_perm;
3309                                 goto out;
3310                         }
3311                         if (!verfs_match) { /* case 8 */
3312                                 status = nfserr_not_same;
3313                                 goto out;
3314                         }
3315                         /* case 6 */
3316                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3317                         trace_nfsd_clid_confirmed_r(conf);
3318                         goto out_copy;
3319                 }
3320                 if (!creds_match) { /* case 3 */
3321                         if (client_has_state(conf)) {
3322                                 status = nfserr_clid_inuse;
3323                                 trace_nfsd_clid_cred_mismatch(conf, rqstp);
3324                                 goto out;
3325                         }
3326                         goto out_new;
3327                 }
3328                 if (verfs_match) { /* case 2 */
3329                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3330                         trace_nfsd_clid_confirmed_r(conf);
3331                         goto out_copy;
3332                 }
3333                 /* case 5, client reboot */
3334                 trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
3335                 conf = NULL;
3336                 goto out_new;
3337         }
3338
3339         if (update) { /* case 7 */
3340                 status = nfserr_noent;
3341                 goto out;
3342         }
3343
3344         unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3345         if (unconf) /* case 4, possible retry or client restart */
3346                 unhash_client_locked(unconf);
3347
3348         /* case 1, new owner ID */
3349         trace_nfsd_clid_fresh(new);
3350
3351 out_new:
3352         if (conf) {
3353                 status = mark_client_expired_locked(conf);
3354                 if (status)
3355                         goto out;
3356                 trace_nfsd_clid_replaced(&conf->cl_clientid);
3357         }
3358         new->cl_minorversion = cstate->minorversion;
3359         new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3360         new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3361
3362         add_to_unconfirmed(new);
3363         swap(new, conf);
3364 out_copy:
3365         exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3366         exid->clientid.cl_id = conf->cl_clientid.cl_id;
3367
3368         exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3369         nfsd4_set_ex_flags(conf, exid);
3370
3371         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3372                 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3373         status = nfs_ok;
3374
3375 out:
3376         spin_unlock(&nn->client_lock);
3377 out_nolock:
3378         if (new)
3379                 expire_client(new);
3380         if (unconf) {
3381                 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
3382                 expire_client(unconf);
3383         }
3384         return status;
3385 }
3386
3387 static __be32
3388 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3389 {
3390         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3391                 slot_seqid);
3392
3393         /* The slot is in use, and no response has been sent. */
3394         if (slot_inuse) {
3395                 if (seqid == slot_seqid)
3396                         return nfserr_jukebox;
3397                 else
3398                         return nfserr_seq_misordered;
3399         }
3400         /* Note unsigned 32-bit arithmetic handles wraparound: */
3401         if (likely(seqid == slot_seqid + 1))
3402                 return nfs_ok;
3403         if (seqid == slot_seqid)
3404                 return nfserr_replay_cache;
3405         return nfserr_seq_misordered;
3406 }
3407
3408 /*
3409  * Cache the create session result into the create session single DRC
3410  * slot cache by saving the xdr structure. sl_seqid has been set.
3411  * Do this for solo or embedded create session operations.
3412  */
3413 static void
3414 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3415                            struct nfsd4_clid_slot *slot, __be32 nfserr)
3416 {
3417         slot->sl_status = nfserr;
3418         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3419 }
3420
3421 static __be32
3422 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3423                             struct nfsd4_clid_slot *slot)
3424 {
3425         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3426         return slot->sl_status;
3427 }
3428
3429 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3430                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3431                         1 +     /* MIN tag is length with zero, only length */ \
3432                         3 +     /* version, opcount, opcode */ \
3433                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3434                                 /* seqid, slotID, slotID, cache */ \
3435                         4 ) * sizeof(__be32))
3436
3437 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3438                         2 +     /* verifier: AUTH_NULL, length 0 */\
3439                         1 +     /* status */ \
3440                         1 +     /* MIN tag is length with zero, only length */ \
3441                         3 +     /* opcount, opcode, opstatus*/ \
3442                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3443                                 /* seqid, slotID, slotID, slotID, status */ \
3444                         5 ) * sizeof(__be32))
3445
3446 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3447 {
3448         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3449
3450         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3451                 return nfserr_toosmall;
3452         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3453                 return nfserr_toosmall;
3454         ca->headerpadsz = 0;
3455         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3456         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3457         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3458         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3459                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3460         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3461         /*
3462          * Note decreasing slot size below client's request may make it
3463          * difficult for client to function correctly, whereas
3464          * decreasing the number of slots will (just?) affect
3465          * performance.  When short on memory we therefore prefer to
3466          * decrease number of slots instead of their size.  Clients that
3467          * request larger slots than they need will get poor results:
3468          * Note that we always allow at least one slot, because our
3469          * accounting is soft and provides no guarantees either way.
3470          */
3471         ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3472
3473         return nfs_ok;
3474 }
3475
3476 /*
3477  * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3478  * These are based on similar macros in linux/sunrpc/msg_prot.h .
3479  */
3480 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3481         (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3482
3483 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3484         (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3485
3486 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
3487                                  RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3488 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
3489                                  RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3490                                  sizeof(__be32))
3491
3492 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3493 {
3494         ca->headerpadsz = 0;
3495
3496         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3497                 return nfserr_toosmall;
3498         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3499                 return nfserr_toosmall;
3500         ca->maxresp_cached = 0;
3501         if (ca->maxops < 2)
3502                 return nfserr_toosmall;
3503
3504         return nfs_ok;
3505 }
3506
3507 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3508 {
3509         switch (cbs->flavor) {
3510         case RPC_AUTH_NULL:
3511         case RPC_AUTH_UNIX:
3512                 return nfs_ok;
3513         default:
3514                 /*
3515                  * GSS case: the spec doesn't allow us to return this
3516                  * error.  But it also doesn't allow us not to support
3517                  * GSS.
3518                  * I'd rather this fail hard than return some error the
3519                  * client might think it can already handle:
3520                  */
3521                 return nfserr_encr_alg_unsupp;
3522         }
3523 }
3524
3525 __be32
3526 nfsd4_create_session(struct svc_rqst *rqstp,
3527                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3528 {
3529         struct nfsd4_create_session *cr_ses = &u->create_session;
3530         struct sockaddr *sa = svc_addr(rqstp);
3531         struct nfs4_client *conf, *unconf;
3532         struct nfs4_client *old = NULL;
3533         struct nfsd4_session *new;
3534         struct nfsd4_conn *conn;
3535         struct nfsd4_clid_slot *cs_slot = NULL;
3536         __be32 status = 0;
3537         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3538
3539         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3540                 return nfserr_inval;
3541         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3542         if (status)
3543                 return status;
3544         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3545         if (status)
3546                 return status;
3547         status = check_backchannel_attrs(&cr_ses->back_channel);
3548         if (status)
3549                 goto out_release_drc_mem;
3550         status = nfserr_jukebox;
3551         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3552         if (!new)
3553                 goto out_release_drc_mem;
3554         conn = alloc_conn_from_crses(rqstp, cr_ses);
3555         if (!conn)
3556                 goto out_free_session;
3557
3558         spin_lock(&nn->client_lock);
3559         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3560         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3561         WARN_ON_ONCE(conf && unconf);
3562
3563         if (conf) {
3564                 status = nfserr_wrong_cred;
3565                 if (!nfsd4_mach_creds_match(conf, rqstp))
3566                         goto out_free_conn;
3567                 cs_slot = &conf->cl_cs_slot;
3568                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3569                 if (status) {
3570                         if (status == nfserr_replay_cache)
3571                                 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3572                         goto out_free_conn;
3573                 }
3574         } else if (unconf) {
3575                 status = nfserr_clid_inuse;
3576                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3577                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3578                         trace_nfsd_clid_cred_mismatch(unconf, rqstp);
3579                         goto out_free_conn;
3580                 }
3581                 status = nfserr_wrong_cred;
3582                 if (!nfsd4_mach_creds_match(unconf, rqstp))
3583                         goto out_free_conn;
3584                 cs_slot = &unconf->cl_cs_slot;
3585                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3586                 if (status) {
3587                         /* an unconfirmed replay returns misordered */
3588                         status = nfserr_seq_misordered;
3589                         goto out_free_conn;
3590                 }
3591                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3592                 if (old) {
3593                         status = mark_client_expired_locked(old);
3594                         if (status) {
3595                                 old = NULL;
3596                                 goto out_free_conn;
3597                         }
3598                         trace_nfsd_clid_replaced(&old->cl_clientid);
3599                 }
3600                 move_to_confirmed(unconf);
3601                 conf = unconf;
3602         } else {
3603                 status = nfserr_stale_clientid;
3604                 goto out_free_conn;
3605         }
3606         status = nfs_ok;
3607         /* Persistent sessions are not supported */
3608         cr_ses->flags &= ~SESSION4_PERSIST;
3609         /* Upshifting from TCP to RDMA is not supported */
3610         cr_ses->flags &= ~SESSION4_RDMA;
3611
3612         init_session(rqstp, new, conf, cr_ses);
3613         nfsd4_get_session_locked(new);
3614
3615         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3616                NFS4_MAX_SESSIONID_LEN);
3617         cs_slot->sl_seqid++;
3618         cr_ses->seqid = cs_slot->sl_seqid;
3619
3620         /* cache solo and embedded create sessions under the client_lock */
3621         nfsd4_cache_create_session(cr_ses, cs_slot, status);
3622         spin_unlock(&nn->client_lock);
3623         if (conf == unconf)
3624                 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
3625         /* init connection and backchannel */
3626         nfsd4_init_conn(rqstp, conn, new);
3627         nfsd4_put_session(new);
3628         if (old)
3629                 expire_client(old);
3630         return status;
3631 out_free_conn:
3632         spin_unlock(&nn->client_lock);
3633         free_conn(conn);
3634         if (old)
3635                 expire_client(old);
3636 out_free_session:
3637         __free_session(new);
3638 out_release_drc_mem:
3639         nfsd4_put_drc_mem(&cr_ses->fore_channel);
3640         return status;
3641 }
3642
3643 static __be32 nfsd4_map_bcts_dir(u32 *dir)
3644 {
3645         switch (*dir) {
3646         case NFS4_CDFC4_FORE:
3647         case NFS4_CDFC4_BACK:
3648                 return nfs_ok;
3649         case NFS4_CDFC4_FORE_OR_BOTH:
3650         case NFS4_CDFC4_BACK_OR_BOTH:
3651                 *dir = NFS4_CDFC4_BOTH;
3652                 return nfs_ok;
3653         }
3654         return nfserr_inval;
3655 }
3656
3657 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3658                 struct nfsd4_compound_state *cstate,
3659                 union nfsd4_op_u *u)
3660 {
3661         struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3662         struct nfsd4_session *session = cstate->session;
3663         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3664         __be32 status;
3665
3666         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3667         if (status)
3668                 return status;
3669         spin_lock(&nn->client_lock);
3670         session->se_cb_prog = bc->bc_cb_program;
3671         session->se_cb_sec = bc->bc_cb_sec;
3672         spin_unlock(&nn->client_lock);
3673
3674         nfsd4_probe_callback(session->se_client);
3675
3676         return nfs_ok;
3677 }
3678
3679 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3680 {
3681         struct nfsd4_conn *c;
3682
3683         list_for_each_entry(c, &s->se_conns, cn_persession) {
3684                 if (c->cn_xprt == xpt) {
3685                         return c;
3686                 }
3687         }
3688         return NULL;
3689 }
3690
3691 static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
3692                 struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
3693 {
3694         struct nfs4_client *clp = session->se_client;
3695         struct svc_xprt *xpt = rqst->rq_xprt;
3696         struct nfsd4_conn *c;
3697         __be32 status;
3698
3699         /* Following the last paragraph of RFC 5661 Section 18.34.3: */
3700         spin_lock(&clp->cl_lock);
3701         c = __nfsd4_find_conn(xpt, session);
3702         if (!c)
3703                 status = nfserr_noent;
3704         else if (req == c->cn_flags)
3705                 status = nfs_ok;
3706         else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
3707                                 c->cn_flags != NFS4_CDFC4_BACK)
3708                 status = nfs_ok;
3709         else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
3710                                 c->cn_flags != NFS4_CDFC4_FORE)
3711                 status = nfs_ok;
3712         else
3713                 status = nfserr_inval;
3714         spin_unlock(&clp->cl_lock);
3715         if (status == nfs_ok && conn)
3716                 *conn = c;
3717         return status;
3718 }
3719
3720 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
3721                      struct nfsd4_compound_state *cstate,
3722                      union nfsd4_op_u *u)
3723 {
3724         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3725         __be32 status;
3726         struct nfsd4_conn *conn;
3727         struct nfsd4_session *session;
3728         struct net *net = SVC_NET(rqstp);
3729         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3730
3731         if (!nfsd4_last_compound_op(rqstp))
3732                 return nfserr_not_only_op;
3733         spin_lock(&nn->client_lock);
3734         session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
3735         spin_unlock(&nn->client_lock);
3736         if (!session)
3737                 goto out_no_session;
3738         status = nfserr_wrong_cred;
3739         if (!nfsd4_mach_creds_match(session->se_client, rqstp))
3740                 goto out;
3741         status = nfsd4_match_existing_connection(rqstp, session,
3742                         bcts->dir, &conn);
3743         if (status == nfs_ok) {
3744                 if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
3745                                 bcts->dir == NFS4_CDFC4_BACK)
3746                         conn->cn_flags |= NFS4_CDFC4_BACK;
3747                 nfsd4_probe_callback(session->se_client);
3748                 goto out;
3749         }
3750         if (status == nfserr_inval)
3751                 goto out;
3752         status = nfsd4_map_bcts_dir(&bcts->dir);
3753         if (status)
3754                 goto out;
3755         conn = alloc_conn(rqstp, bcts->dir);
3756         status = nfserr_jukebox;
3757         if (!conn)
3758                 goto out;
3759         nfsd4_init_conn(rqstp, conn, session);
3760         status = nfs_ok;
3761 out:
3762         nfsd4_put_session(session);
3763 out_no_session:
3764         return status;
3765 }
3766
3767 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
3768 {
3769         if (!cstate->session)
3770                 return false;
3771         return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
3772 }
3773
3774 __be32
3775 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
3776                 union nfsd4_op_u *u)
3777 {
3778         struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
3779         struct nfsd4_session *ses;
3780         __be32 status;
3781         int ref_held_by_me = 0;
3782         struct net *net = SVC_NET(r);
3783         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3784
3785         status = nfserr_not_only_op;
3786         if (nfsd4_compound_in_session(cstate, sessionid)) {
3787                 if (!nfsd4_last_compound_op(r))
3788                         goto out;
3789                 ref_held_by_me++;
3790         }
3791         dump_sessionid(__func__, sessionid);
3792         spin_lock(&nn->client_lock);
3793         ses = find_in_sessionid_hashtbl(sessionid, net, &status);
3794         if (!ses)
3795                 goto out_client_lock;
3796         status = nfserr_wrong_cred;
3797         if (!nfsd4_mach_creds_match(ses->se_client, r))
3798                 goto out_put_session;
3799         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
3800         if (status)
3801                 goto out_put_session;
3802         unhash_session(ses);
3803         spin_unlock(&nn->client_lock);
3804
3805         nfsd4_probe_callback_sync(ses->se_client);
3806
3807         spin_lock(&nn->client_lock);
3808         status = nfs_ok;
3809 out_put_session:
3810         nfsd4_put_session_locked(ses);
3811 out_client_lock:
3812         spin_unlock(&nn->client_lock);
3813 out:
3814         return status;
3815 }
3816
3817 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3818 {
3819         struct nfs4_client *clp = ses->se_client;
3820         struct nfsd4_conn *c;
3821         __be32 status = nfs_ok;
3822         int ret;
3823
3824         spin_lock(&clp->cl_lock);
3825         c = __nfsd4_find_conn(new->cn_xprt, ses);
3826         if (c)
3827                 goto out_free;
3828         status = nfserr_conn_not_bound_to_session;
3829         if (clp->cl_mach_cred)
3830                 goto out_free;
3831         __nfsd4_hash_conn(new, ses);
3832         spin_unlock(&clp->cl_lock);
3833         ret = nfsd4_register_conn(new);
3834         if (ret)
3835                 /* oops; xprt is already down: */
3836                 nfsd4_conn_lost(&new->cn_xpt_user);
3837         return nfs_ok;
3838 out_free:
3839         spin_unlock(&clp->cl_lock);
3840         free_conn(new);
3841         return status;
3842 }
3843
3844 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3845 {
3846         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3847
3848         return args->opcnt > session->se_fchannel.maxops;
3849 }
3850
3851 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3852                                   struct nfsd4_session *session)
3853 {
3854         struct xdr_buf *xb = &rqstp->rq_arg;
3855
3856         return xb->len > session->se_fchannel.maxreq_sz;
3857 }
3858
3859 static bool replay_matches_cache(struct svc_rqst *rqstp,
3860                  struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3861 {
3862         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3863
3864         if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3865             (bool)seq->cachethis)
3866                 return false;
3867         /*
3868          * If there's an error then the reply can have fewer ops than
3869          * the call.
3870          */
3871         if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
3872                 return false;
3873         /*
3874          * But if we cached a reply with *more* ops than the call you're
3875          * sending us now, then this new call is clearly not really a
3876          * replay of the old one:
3877          */
3878         if (slot->sl_opcnt > argp->opcnt)
3879                 return false;
3880         /* This is the only check explicitly called by spec: */
3881         if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3882                 return false;
3883         /*
3884          * There may be more comparisons we could actually do, but the
3885          * spec doesn't require us to catch every case where the calls
3886          * don't match (that would require caching the call as well as
3887          * the reply), so we don't bother.
3888          */
3889         return true;
3890 }
3891
3892 __be32
3893 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3894                 union nfsd4_op_u *u)
3895 {
3896         struct nfsd4_sequence *seq = &u->sequence;
3897         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3898         struct xdr_stream *xdr = resp->xdr;
3899         struct nfsd4_session *session;
3900         struct nfs4_client *clp;
3901         struct nfsd4_slot *slot;
3902         struct nfsd4_conn *conn;
3903         __be32 status;
3904         int buflen;
3905         struct net *net = SVC_NET(rqstp);
3906         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3907
3908         if (resp->opcnt != 1)
3909                 return nfserr_sequence_pos;
3910
3911         /*
3912          * Will be either used or freed by nfsd4_sequence_check_conn
3913          * below.
3914          */
3915         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3916         if (!conn)
3917                 return nfserr_jukebox;
3918
3919         spin_lock(&nn->client_lock);
3920         session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3921         if (!session)
3922                 goto out_no_session;
3923         clp = session->se_client;
3924
3925         status = nfserr_too_many_ops;
3926         if (nfsd4_session_too_many_ops(rqstp, session))
3927                 goto out_put_session;
3928
3929         status = nfserr_req_too_big;
3930         if (nfsd4_request_too_big(rqstp, session))
3931                 goto out_put_session;
3932
3933         status = nfserr_badslot;
3934         if (seq->slotid >= session->se_fchannel.maxreqs)
3935                 goto out_put_session;
3936
3937         slot = session->se_slots[seq->slotid];
3938         dprintk("%s: slotid %d\n", __func__, seq->slotid);
3939
3940         /* We do not negotiate the number of slots yet, so set the
3941          * maxslots to the session maxreqs which is used to encode
3942          * sr_highest_slotid and the sr_target_slot id to maxslots */
3943         seq->maxslots = session->se_fchannel.maxreqs;
3944
3945         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3946                                         slot->sl_flags & NFSD4_SLOT_INUSE);
3947         if (status == nfserr_replay_cache) {
3948                 status = nfserr_seq_misordered;
3949                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3950                         goto out_put_session;
3951                 status = nfserr_seq_false_retry;
3952                 if (!replay_matches_cache(rqstp, seq, slot))
3953                         goto out_put_session;
3954                 cstate->slot = slot;
3955                 cstate->session = session;
3956                 cstate->clp = clp;
3957                 /* Return the cached reply status and set cstate->status
3958                  * for nfsd4_proc_compound processing */
3959                 status = nfsd4_replay_cache_entry(resp, seq);
3960                 cstate->status = nfserr_replay_cache;
3961                 goto out;
3962         }
3963         if (status)
3964                 goto out_put_session;
3965
3966         status = nfsd4_sequence_check_conn(conn, session);
3967         conn = NULL;
3968         if (status)
3969                 goto out_put_session;
3970
3971         buflen = (seq->cachethis) ?
3972                         session->se_fchannel.maxresp_cached :
3973                         session->se_fchannel.maxresp_sz;
3974         status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3975                                     nfserr_rep_too_big;
3976         if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3977                 goto out_put_session;
3978         svc_reserve(rqstp, buflen);
3979
3980         status = nfs_ok;
3981         /* Success! bump slot seqid */
3982         slot->sl_seqid = seq->seqid;
3983         slot->sl_flags |= NFSD4_SLOT_INUSE;
3984         if (seq->cachethis)
3985                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3986         else
3987                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3988
3989         cstate->slot = slot;
3990         cstate->session = session;
3991         cstate->clp = clp;
3992
3993 out:
3994         switch (clp->cl_cb_state) {
3995         case NFSD4_CB_DOWN:
3996                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3997                 break;
3998         case NFSD4_CB_FAULT:
3999                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
4000                 break;
4001         default:
4002                 seq->status_flags = 0;
4003         }
4004         if (!list_empty(&clp->cl_revoked))
4005                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
4006 out_no_session:
4007         if (conn)
4008                 free_conn(conn);
4009         spin_unlock(&nn->client_lock);
4010         return status;
4011 out_put_session:
4012         nfsd4_put_session_locked(session);
4013         goto out_no_session;
4014 }
4015
4016 void
4017 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
4018 {
4019         struct nfsd4_compound_state *cs = &resp->cstate;
4020
4021         if (nfsd4_has_session(cs)) {
4022                 if (cs->status != nfserr_replay_cache) {
4023                         nfsd4_store_cache_entry(resp);
4024                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4025                 }
4026                 /* Drop session reference that was taken in nfsd4_sequence() */
4027                 nfsd4_put_session(cs->session);
4028         } else if (cs->clp)
4029                 put_client_renew(cs->clp);
4030 }
4031
4032 __be32
4033 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
4034                 struct nfsd4_compound_state *cstate,
4035                 union nfsd4_op_u *u)
4036 {
4037         struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
4038         struct nfs4_client *conf, *unconf;
4039         struct nfs4_client *clp = NULL;
4040         __be32 status = 0;
4041         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4042
4043         spin_lock(&nn->client_lock);
4044         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
4045         conf = find_confirmed_client(&dc->clientid, true, nn);
4046         WARN_ON_ONCE(conf && unconf);
4047
4048         if (conf) {
4049                 if (client_has_state(conf)) {
4050                         status = nfserr_clientid_busy;
4051                         goto out;
4052                 }
4053                 status = mark_client_expired_locked(conf);
4054                 if (status)
4055                         goto out;
4056                 clp = conf;
4057         } else if (unconf)
4058                 clp = unconf;
4059         else {
4060                 status = nfserr_stale_clientid;
4061                 goto out;
4062         }
4063         if (!nfsd4_mach_creds_match(clp, rqstp)) {
4064                 clp = NULL;
4065                 status = nfserr_wrong_cred;
4066                 goto out;
4067         }
4068         trace_nfsd_clid_destroyed(&clp->cl_clientid);
4069         unhash_client_locked(clp);
4070 out:
4071         spin_unlock(&nn->client_lock);
4072         if (clp)
4073                 expire_client(clp);
4074         return status;
4075 }
4076
4077 __be32
4078 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
4079                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
4080 {
4081         struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
4082         struct nfs4_client *clp = cstate->clp;
4083         __be32 status = 0;
4084
4085         if (rc->rca_one_fs) {
4086                 if (!cstate->current_fh.fh_dentry)
4087                         return nfserr_nofilehandle;
4088                 /*
4089                  * We don't take advantage of the rca_one_fs case.
4090                  * That's OK, it's optional, we can safely ignore it.
4091                  */
4092                 return nfs_ok;
4093         }
4094
4095         status = nfserr_complete_already;
4096         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
4097                 goto out;
4098
4099         status = nfserr_stale_clientid;
4100         if (is_client_expired(clp))
4101                 /*
4102                  * The following error isn't really legal.
4103                  * But we only get here if the client just explicitly
4104                  * destroyed the client.  Surely it no longer cares what
4105                  * error it gets back on an operation for the dead
4106                  * client.
4107                  */
4108                 goto out;
4109
4110         status = nfs_ok;
4111         trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
4112         nfsd4_client_record_create(clp);
4113         inc_reclaim_complete(clp);
4114 out:
4115         return status;
4116 }
4117
4118 __be32
4119 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4120                   union nfsd4_op_u *u)
4121 {
4122         struct nfsd4_setclientid *setclid = &u->setclientid;
4123         struct xdr_netobj       clname = setclid->se_name;
4124         nfs4_verifier           clverifier = setclid->se_verf;
4125         struct nfs4_client      *conf, *new;
4126         struct nfs4_client      *unconf = NULL;
4127         __be32                  status;
4128         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4129
4130         new = create_client(clname, rqstp, &clverifier);
4131         if (new == NULL)
4132                 return nfserr_jukebox;
4133         spin_lock(&nn->client_lock);
4134         conf = find_confirmed_client_by_name(&clname, nn);
4135         if (conf && client_has_state(conf)) {
4136                 status = nfserr_clid_inuse;
4137                 if (clp_used_exchangeid(conf))
4138                         goto out;
4139                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4140                         trace_nfsd_clid_cred_mismatch(conf, rqstp);
4141                         goto out;
4142                 }
4143         }
4144         unconf = find_unconfirmed_client_by_name(&clname, nn);
4145         if (unconf)
4146                 unhash_client_locked(unconf);
4147         if (conf) {
4148                 if (same_verf(&conf->cl_verifier, &clverifier)) {
4149                         copy_clid(new, conf);
4150                         gen_confirm(new, nn);
4151                 } else
4152                         trace_nfsd_clid_verf_mismatch(conf, rqstp,
4153                                                       &clverifier);
4154         } else
4155                 trace_nfsd_clid_fresh(new);
4156         new->cl_minorversion = 0;
4157         gen_callback(new, setclid, rqstp);
4158         add_to_unconfirmed(new);
4159         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
4160         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
4161         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
4162         new = NULL;
4163         status = nfs_ok;
4164 out:
4165         spin_unlock(&nn->client_lock);
4166         if (new)
4167                 free_client(new);
4168         if (unconf) {
4169                 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
4170                 expire_client(unconf);
4171         }
4172         return status;
4173 }
4174
4175 __be32
4176 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4177                         struct nfsd4_compound_state *cstate,
4178                         union nfsd4_op_u *u)
4179 {
4180         struct nfsd4_setclientid_confirm *setclientid_confirm =
4181                         &u->setclientid_confirm;
4182         struct nfs4_client *conf, *unconf;
4183         struct nfs4_client *old = NULL;
4184         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
4185         clientid_t * clid = &setclientid_confirm->sc_clientid;
4186         __be32 status;
4187         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4188
4189         if (STALE_CLIENTID(clid, nn))
4190                 return nfserr_stale_clientid;
4191
4192         spin_lock(&nn->client_lock);
4193         conf = find_confirmed_client(clid, false, nn);
4194         unconf = find_unconfirmed_client(clid, false, nn);
4195         /*
4196          * We try hard to give out unique clientid's, so if we get an
4197          * attempt to confirm the same clientid with a different cred,
4198          * the client may be buggy; this should never happen.
4199          *
4200          * Nevertheless, RFC 7530 recommends INUSE for this case:
4201          */
4202         status = nfserr_clid_inuse;
4203         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
4204                 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
4205                 goto out;
4206         }
4207         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4208                 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4209                 goto out;
4210         }
4211         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
4212                 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
4213                         status = nfs_ok;
4214                 } else
4215                         status = nfserr_stale_clientid;
4216                 goto out;
4217         }
4218         status = nfs_ok;
4219         if (conf) {
4220                 old = unconf;
4221                 unhash_client_locked(old);
4222                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
4223         } else {
4224                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4225                 if (old) {
4226                         status = nfserr_clid_inuse;
4227                         if (client_has_state(old)
4228                                         && !same_creds(&unconf->cl_cred,
4229                                                         &old->cl_cred)) {
4230                                 old = NULL;
4231                                 goto out;
4232                         }
4233                         status = mark_client_expired_locked(old);
4234                         if (status) {
4235                                 old = NULL;
4236                                 goto out;
4237                         }
4238                         trace_nfsd_clid_replaced(&old->cl_clientid);
4239                 }
4240                 move_to_confirmed(unconf);
4241                 conf = unconf;
4242         }
4243         get_client_locked(conf);
4244         spin_unlock(&nn->client_lock);
4245         if (conf == unconf)
4246                 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
4247         nfsd4_probe_callback(conf);
4248         spin_lock(&nn->client_lock);
4249         put_client_renew_locked(conf);
4250 out:
4251         spin_unlock(&nn->client_lock);
4252         if (old)
4253                 expire_client(old);
4254         return status;
4255 }
4256
4257 static struct nfs4_file *nfsd4_alloc_file(void)
4258 {
4259         return kmem_cache_alloc(file_slab, GFP_KERNEL);
4260 }
4261
4262 /* OPEN Share state helper functions */
4263 static void nfsd4_init_file(struct svc_fh *fh, unsigned int hashval,
4264                                 struct nfs4_file *fp)
4265 {
4266         lockdep_assert_held(&state_lock);
4267
4268         refcount_set(&fp->fi_ref, 1);
4269         spin_lock_init(&fp->fi_lock);
4270         INIT_LIST_HEAD(&fp->fi_stateids);
4271         INIT_LIST_HEAD(&fp->fi_delegations);
4272         INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4273         fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
4274         fp->fi_deleg_file = NULL;
4275         fp->fi_had_conflict = false;
4276         fp->fi_share_deny = 0;
4277         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4278         memset(fp->fi_access, 0, sizeof(fp->fi_access));
4279         fp->fi_aliased = false;
4280         fp->fi_inode = d_inode(fh->fh_dentry);
4281 #ifdef CONFIG_NFSD_PNFS
4282         INIT_LIST_HEAD(&fp->fi_lo_states);
4283         atomic_set(&fp->fi_lo_recalls, 0);
4284 #endif
4285         hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
4286 }
4287
4288 void
4289 nfsd4_free_slabs(void)
4290 {
4291         kmem_cache_destroy(client_slab);
4292         kmem_cache_destroy(openowner_slab);
4293         kmem_cache_destroy(lockowner_slab);
4294         kmem_cache_destroy(file_slab);
4295         kmem_cache_destroy(stateid_slab);
4296         kmem_cache_destroy(deleg_slab);
4297         kmem_cache_destroy(odstate_slab);
4298 }
4299
4300 int
4301 nfsd4_init_slabs(void)
4302 {
4303         client_slab = kmem_cache_create("nfsd4_clients",
4304                         sizeof(struct nfs4_client), 0, 0, NULL);
4305         if (client_slab == NULL)
4306                 goto out;
4307         openowner_slab = kmem_cache_create("nfsd4_openowners",
4308                         sizeof(struct nfs4_openowner), 0, 0, NULL);
4309         if (openowner_slab == NULL)
4310                 goto out_free_client_slab;
4311         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
4312                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
4313         if (lockowner_slab == NULL)
4314                 goto out_free_openowner_slab;
4315         file_slab = kmem_cache_create("nfsd4_files",
4316                         sizeof(struct nfs4_file), 0, 0, NULL);
4317         if (file_slab == NULL)
4318                 goto out_free_lockowner_slab;
4319         stateid_slab = kmem_cache_create("nfsd4_stateids",
4320                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
4321         if (stateid_slab == NULL)
4322                 goto out_free_file_slab;
4323         deleg_slab = kmem_cache_create("nfsd4_delegations",
4324                         sizeof(struct nfs4_delegation), 0, 0, NULL);
4325         if (deleg_slab == NULL)
4326                 goto out_free_stateid_slab;
4327         odstate_slab = kmem_cache_create("nfsd4_odstate",
4328                         sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
4329         if (odstate_slab == NULL)
4330                 goto out_free_deleg_slab;
4331         return 0;
4332
4333 out_free_deleg_slab:
4334         kmem_cache_destroy(deleg_slab);
4335 out_free_stateid_slab:
4336         kmem_cache_destroy(stateid_slab);
4337 out_free_file_slab:
4338         kmem_cache_destroy(file_slab);
4339 out_free_lockowner_slab:
4340         kmem_cache_destroy(lockowner_slab);
4341 out_free_openowner_slab:
4342         kmem_cache_destroy(openowner_slab);
4343 out_free_client_slab:
4344         kmem_cache_destroy(client_slab);
4345 out:
4346         return -ENOMEM;
4347 }
4348
4349 static unsigned long
4350 nfsd_courtesy_client_count(struct shrinker *shrink, struct shrink_control *sc)
4351 {
4352         int cnt;
4353         struct nfsd_net *nn = container_of(shrink,
4354                         struct nfsd_net, nfsd_client_shrinker);
4355
4356         cnt = atomic_read(&nn->nfsd_courtesy_clients);
4357         if (cnt > 0)
4358                 mod_delayed_work(laundry_wq, &nn->nfsd_shrinker_work, 0);
4359         return (unsigned long)cnt;
4360 }
4361
4362 static unsigned long
4363 nfsd_courtesy_client_scan(struct shrinker *shrink, struct shrink_control *sc)
4364 {
4365         return SHRINK_STOP;
4366 }
4367
4368 int
4369 nfsd4_init_leases_net(struct nfsd_net *nn)
4370 {
4371         struct sysinfo si;
4372         u64 max_clients;
4373
4374         nn->nfsd4_lease = 90;   /* default lease time */
4375         nn->nfsd4_grace = 90;
4376         nn->somebody_reclaimed = false;
4377         nn->track_reclaim_completes = false;
4378         nn->clverifier_counter = get_random_u32();
4379         nn->clientid_base = get_random_u32();
4380         nn->clientid_counter = nn->clientid_base + 1;
4381         nn->s2s_cp_cl_id = nn->clientid_counter++;
4382
4383         atomic_set(&nn->nfs4_client_count, 0);
4384         si_meminfo(&si);
4385         max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
4386         max_clients *= NFS4_CLIENTS_PER_GB;
4387         nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
4388
4389         atomic_set(&nn->nfsd_courtesy_clients, 0);
4390         nn->nfsd_client_shrinker.scan_objects = nfsd_courtesy_client_scan;
4391         nn->nfsd_client_shrinker.count_objects = nfsd_courtesy_client_count;
4392         nn->nfsd_client_shrinker.seeks = DEFAULT_SEEKS;
4393         return register_shrinker(&nn->nfsd_client_shrinker, "nfsd-client");
4394 }
4395
4396 void
4397 nfsd4_leases_net_shutdown(struct nfsd_net *nn)
4398 {
4399         unregister_shrinker(&nn->nfsd_client_shrinker);
4400 }
4401
4402 static void init_nfs4_replay(struct nfs4_replay *rp)
4403 {
4404         rp->rp_status = nfserr_serverfault;
4405         rp->rp_buflen = 0;
4406         rp->rp_buf = rp->rp_ibuf;
4407         mutex_init(&rp->rp_mutex);
4408 }
4409
4410 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4411                 struct nfs4_stateowner *so)
4412 {
4413         if (!nfsd4_has_session(cstate)) {
4414                 mutex_lock(&so->so_replay.rp_mutex);
4415                 cstate->replay_owner = nfs4_get_stateowner(so);
4416         }
4417 }
4418
4419 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4420 {
4421         struct nfs4_stateowner *so = cstate->replay_owner;
4422
4423         if (so != NULL) {
4424                 cstate->replay_owner = NULL;
4425                 mutex_unlock(&so->so_replay.rp_mutex);
4426                 nfs4_put_stateowner(so);
4427         }
4428 }
4429
4430 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4431 {
4432         struct nfs4_stateowner *sop;
4433
4434         sop = kmem_cache_alloc(slab, GFP_KERNEL);
4435         if (!sop)
4436                 return NULL;
4437
4438         xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4439         if (!sop->so_owner.data) {
4440                 kmem_cache_free(slab, sop);
4441                 return NULL;
4442         }
4443
4444         INIT_LIST_HEAD(&sop->so_stateids);
4445         sop->so_client = clp;
4446         init_nfs4_replay(&sop->so_replay);
4447         atomic_set(&sop->so_count, 1);
4448         return sop;
4449 }
4450
4451 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4452 {
4453         lockdep_assert_held(&clp->cl_lock);
4454
4455         list_add(&oo->oo_owner.so_strhash,
4456                  &clp->cl_ownerstr_hashtbl[strhashval]);
4457         list_add(&oo->oo_perclient, &clp->cl_openowners);
4458 }
4459
4460 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4461 {
4462         unhash_openowner_locked(openowner(so));
4463 }
4464
4465 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4466 {
4467         struct nfs4_openowner *oo = openowner(so);
4468
4469         kmem_cache_free(openowner_slab, oo);
4470 }
4471
4472 static const struct nfs4_stateowner_operations openowner_ops = {
4473         .so_unhash =    nfs4_unhash_openowner,
4474         .so_free =      nfs4_free_openowner,
4475 };
4476
4477 static struct nfs4_ol_stateid *
4478 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4479 {
4480         struct nfs4_ol_stateid *local, *ret = NULL;
4481         struct nfs4_openowner *oo = open->op_openowner;
4482
4483         lockdep_assert_held(&fp->fi_lock);
4484
4485         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4486                 /* ignore lock owners */
4487                 if (local->st_stateowner->so_is_open_owner == 0)
4488                         continue;
4489                 if (local->st_stateowner != &oo->oo_owner)
4490                         continue;
4491                 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
4492                         ret = local;
4493                         refcount_inc(&ret->st_stid.sc_count);
4494                         break;
4495                 }
4496         }
4497         return ret;
4498 }
4499
4500 static __be32
4501 nfsd4_verify_open_stid(struct nfs4_stid *s)
4502 {
4503         __be32 ret = nfs_ok;
4504
4505         switch (s->sc_type) {
4506         default:
4507                 break;
4508         case 0:
4509         case NFS4_CLOSED_STID:
4510         case NFS4_CLOSED_DELEG_STID:
4511                 ret = nfserr_bad_stateid;
4512                 break;
4513         case NFS4_REVOKED_DELEG_STID:
4514                 ret = nfserr_deleg_revoked;
4515         }
4516         return ret;
4517 }
4518
4519 /* Lock the stateid st_mutex, and deal with races with CLOSE */
4520 static __be32
4521 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4522 {
4523         __be32 ret;
4524
4525         mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4526         ret = nfsd4_verify_open_stid(&stp->st_stid);
4527         if (ret != nfs_ok)
4528                 mutex_unlock(&stp->st_mutex);
4529         return ret;
4530 }
4531
4532 static struct nfs4_ol_stateid *
4533 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4534 {
4535         struct nfs4_ol_stateid *stp;
4536         for (;;) {
4537                 spin_lock(&fp->fi_lock);
4538                 stp = nfsd4_find_existing_open(fp, open);
4539                 spin_unlock(&fp->fi_lock);
4540                 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4541                         break;
4542                 nfs4_put_stid(&stp->st_stid);
4543         }
4544         return stp;
4545 }
4546
4547 static struct nfs4_openowner *
4548 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4549                            struct nfsd4_compound_state *cstate)
4550 {
4551         struct nfs4_client *clp = cstate->clp;
4552         struct nfs4_openowner *oo, *ret;
4553
4554         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4555         if (!oo)
4556                 return NULL;
4557         oo->oo_owner.so_ops = &openowner_ops;
4558         oo->oo_owner.so_is_open_owner = 1;
4559         oo->oo_owner.so_seqid = open->op_seqid;
4560         oo->oo_flags = 0;
4561         if (nfsd4_has_session(cstate))
4562                 oo->oo_flags |= NFS4_OO_CONFIRMED;
4563         oo->oo_time = 0;
4564         oo->oo_last_closed_stid = NULL;
4565         INIT_LIST_HEAD(&oo->oo_close_lru);
4566         spin_lock(&clp->cl_lock);
4567         ret = find_openstateowner_str_locked(strhashval, open, clp);
4568         if (ret == NULL) {
4569                 hash_openowner(oo, clp, strhashval);
4570                 ret = oo;
4571         } else
4572                 nfs4_free_stateowner(&oo->oo_owner);
4573
4574         spin_unlock(&clp->cl_lock);
4575         return ret;
4576 }
4577
4578 static struct nfs4_ol_stateid *
4579 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4580 {
4581
4582         struct nfs4_openowner *oo = open->op_openowner;
4583         struct nfs4_ol_stateid *retstp = NULL;
4584         struct nfs4_ol_stateid *stp;
4585
4586         stp = open->op_stp;
4587         /* We are moving these outside of the spinlocks to avoid the warnings */
4588         mutex_init(&stp->st_mutex);
4589         mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4590
4591 retry:
4592         spin_lock(&oo->oo_owner.so_client->cl_lock);
4593         spin_lock(&fp->fi_lock);
4594
4595         retstp = nfsd4_find_existing_open(fp, open);
4596         if (retstp)
4597                 goto out_unlock;
4598
4599         open->op_stp = NULL;
4600         refcount_inc(&stp->st_stid.sc_count);
4601         stp->st_stid.sc_type = NFS4_OPEN_STID;
4602         INIT_LIST_HEAD(&stp->st_locks);
4603         stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4604         get_nfs4_file(fp);
4605         stp->st_stid.sc_file = fp;
4606         stp->st_access_bmap = 0;
4607         stp->st_deny_bmap = 0;
4608         stp->st_openstp = NULL;
4609         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4610         list_add(&stp->st_perfile, &fp->fi_stateids);
4611
4612 out_unlock:
4613         spin_unlock(&fp->fi_lock);
4614         spin_unlock(&oo->oo_owner.so_client->cl_lock);
4615         if (retstp) {
4616                 /* Handle races with CLOSE */
4617                 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4618                         nfs4_put_stid(&retstp->st_stid);
4619                         goto retry;
4620                 }
4621                 /* To keep mutex tracking happy */
4622                 mutex_unlock(&stp->st_mutex);
4623                 stp = retstp;
4624         }
4625         return stp;
4626 }
4627
4628 /*
4629  * In the 4.0 case we need to keep the owners around a little while to handle
4630  * CLOSE replay. We still do need to release any file access that is held by
4631  * them before returning however.
4632  */
4633 static void
4634 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4635 {
4636         struct nfs4_ol_stateid *last;
4637         struct nfs4_openowner *oo = openowner(s->st_stateowner);
4638         struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4639                                                 nfsd_net_id);
4640
4641         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4642
4643         /*
4644          * We know that we hold one reference via nfsd4_close, and another
4645          * "persistent" reference for the client. If the refcount is higher
4646          * than 2, then there are still calls in progress that are using this
4647          * stateid. We can't put the sc_file reference until they are finished.
4648          * Wait for the refcount to drop to 2. Since it has been unhashed,
4649          * there should be no danger of the refcount going back up again at
4650          * this point.
4651          */
4652         wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4653
4654         release_all_access(s);
4655         if (s->st_stid.sc_file) {
4656                 put_nfs4_file(s->st_stid.sc_file);
4657                 s->st_stid.sc_file = NULL;
4658         }
4659
4660         spin_lock(&nn->client_lock);
4661         last = oo->oo_last_closed_stid;
4662         oo->oo_last_closed_stid = s;
4663         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
4664         oo->oo_time = ktime_get_boottime_seconds();
4665         spin_unlock(&nn->client_lock);
4666         if (last)
4667                 nfs4_put_stid(&last->st_stid);
4668 }
4669
4670 /* search file_hashtbl[] for file */
4671 static struct nfs4_file *
4672 find_file_locked(struct svc_fh *fh, unsigned int hashval)
4673 {
4674         struct nfs4_file *fp;
4675
4676         hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4677                                 lockdep_is_held(&state_lock)) {
4678                 if (fh_match(&fp->fi_fhandle, &fh->fh_handle)) {
4679                         if (refcount_inc_not_zero(&fp->fi_ref))
4680                                 return fp;
4681                 }
4682         }
4683         return NULL;
4684 }
4685
4686 static struct nfs4_file *insert_file(struct nfs4_file *new, struct svc_fh *fh,
4687                                      unsigned int hashval)
4688 {
4689         struct nfs4_file *fp;
4690         struct nfs4_file *ret = NULL;
4691         bool alias_found = false;
4692
4693         spin_lock(&state_lock);
4694         hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4695                                  lockdep_is_held(&state_lock)) {
4696                 if (fh_match(&fp->fi_fhandle, &fh->fh_handle)) {
4697                         if (refcount_inc_not_zero(&fp->fi_ref))
4698                                 ret = fp;
4699                 } else if (d_inode(fh->fh_dentry) == fp->fi_inode)
4700                         fp->fi_aliased = alias_found = true;
4701         }
4702         if (likely(ret == NULL)) {
4703                 nfsd4_init_file(fh, hashval, new);
4704                 new->fi_aliased = alias_found;
4705                 ret = new;
4706         }
4707         spin_unlock(&state_lock);
4708         return ret;
4709 }
4710
4711 static struct nfs4_file * find_file(struct svc_fh *fh)
4712 {
4713         struct nfs4_file *fp;
4714         unsigned int hashval = file_hashval(fh);
4715
4716         rcu_read_lock();
4717         fp = find_file_locked(fh, hashval);
4718         rcu_read_unlock();
4719         return fp;
4720 }
4721
4722 static struct nfs4_file *
4723 find_or_add_file(struct nfs4_file *new, struct svc_fh *fh)
4724 {
4725         struct nfs4_file *fp;
4726         unsigned int hashval = file_hashval(fh);
4727
4728         rcu_read_lock();
4729         fp = find_file_locked(fh, hashval);
4730         rcu_read_unlock();
4731         if (fp)
4732                 return fp;
4733
4734         return insert_file(new, fh, hashval);
4735 }
4736
4737 /*
4738  * Called to check deny when READ with all zero stateid or
4739  * WRITE with all zero or all one stateid
4740  */
4741 static __be32
4742 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
4743 {
4744         struct nfs4_file *fp;
4745         __be32 ret = nfs_ok;
4746
4747         fp = find_file(current_fh);
4748         if (!fp)
4749                 return ret;
4750         /* Check for conflicting share reservations */
4751         spin_lock(&fp->fi_lock);
4752         if (fp->fi_share_deny & deny_type)
4753                 ret = nfserr_locked;
4754         spin_unlock(&fp->fi_lock);
4755         put_nfs4_file(fp);
4756         return ret;
4757 }
4758
4759 static bool nfsd4_deleg_present(const struct inode *inode)
4760 {
4761         struct file_lock_context *ctx = smp_load_acquire(&inode->i_flctx);
4762
4763         return ctx && !list_empty_careful(&ctx->flc_lease);
4764 }
4765
4766 /**
4767  * nfsd_wait_for_delegreturn - wait for delegations to be returned
4768  * @rqstp: the RPC transaction being executed
4769  * @inode: in-core inode of the file being waited for
4770  *
4771  * The timeout prevents deadlock if all nfsd threads happen to be
4772  * tied up waiting for returning delegations.
4773  *
4774  * Return values:
4775  *   %true: delegation was returned
4776  *   %false: timed out waiting for delegreturn
4777  */
4778 bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
4779 {
4780         long __maybe_unused timeo;
4781
4782         timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
4783                                        NFSD_DELEGRETURN_TIMEOUT);
4784         trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
4785         return timeo > 0;
4786 }
4787
4788 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
4789 {
4790         struct nfs4_delegation *dp = cb_to_delegation(cb);
4791         struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
4792                                           nfsd_net_id);
4793
4794         block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
4795
4796         /*
4797          * We can't do this in nfsd_break_deleg_cb because it is
4798          * already holding inode->i_lock.
4799          *
4800          * If the dl_time != 0, then we know that it has already been
4801          * queued for a lease break. Don't queue it again.
4802          */
4803         spin_lock(&state_lock);
4804         if (delegation_hashed(dp) && dp->dl_time == 0) {
4805                 dp->dl_time = ktime_get_boottime_seconds();
4806                 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
4807         }
4808         spin_unlock(&state_lock);
4809 }
4810
4811 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
4812                 struct rpc_task *task)
4813 {
4814         struct nfs4_delegation *dp = cb_to_delegation(cb);
4815
4816         trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
4817
4818         if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID ||
4819             dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4820                 return 1;
4821
4822         switch (task->tk_status) {
4823         case 0:
4824                 return 1;
4825         case -NFS4ERR_DELAY:
4826                 rpc_delay(task, 2 * HZ);
4827                 return 0;
4828         case -EBADHANDLE:
4829         case -NFS4ERR_BAD_STATEID:
4830                 /*
4831                  * Race: client probably got cb_recall before open reply
4832                  * granting delegation.
4833                  */
4834                 if (dp->dl_retries--) {
4835                         rpc_delay(task, 2 * HZ);
4836                         return 0;
4837                 }
4838                 fallthrough;
4839         default:
4840                 return 1;
4841         }
4842 }
4843
4844 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
4845 {
4846         struct nfs4_delegation *dp = cb_to_delegation(cb);
4847
4848         nfs4_put_stid(&dp->dl_stid);
4849 }
4850
4851 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
4852         .prepare        = nfsd4_cb_recall_prepare,
4853         .done           = nfsd4_cb_recall_done,
4854         .release        = nfsd4_cb_recall_release,
4855 };
4856
4857 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
4858 {
4859         /*
4860          * We're assuming the state code never drops its reference
4861          * without first removing the lease.  Since we're in this lease
4862          * callback (and since the lease code is serialized by the
4863          * flc_lock) we know the server hasn't removed the lease yet, and
4864          * we know it's safe to take a reference.
4865          */
4866         refcount_inc(&dp->dl_stid.sc_count);
4867         WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
4868 }
4869
4870 /* Called from break_lease() with flc_lock held. */
4871 static bool
4872 nfsd_break_deleg_cb(struct file_lock *fl)
4873 {
4874         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
4875         struct nfs4_file *fp = dp->dl_stid.sc_file;
4876         struct nfs4_client *clp = dp->dl_stid.sc_client;
4877         struct nfsd_net *nn;
4878
4879         trace_nfsd_cb_recall(&dp->dl_stid);
4880
4881         dp->dl_recalled = true;
4882         atomic_inc(&clp->cl_delegs_in_recall);
4883         if (try_to_expire_client(clp)) {
4884                 nn = net_generic(clp->net, nfsd_net_id);
4885                 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
4886         }
4887
4888         /*
4889          * We don't want the locks code to timeout the lease for us;
4890          * we'll remove it ourself if a delegation isn't returned
4891          * in time:
4892          */
4893         fl->fl_break_time = 0;
4894
4895         spin_lock(&fp->fi_lock);
4896         fp->fi_had_conflict = true;
4897         nfsd_break_one_deleg(dp);
4898         spin_unlock(&fp->fi_lock);
4899         return false;
4900 }
4901
4902 /**
4903  * nfsd_breaker_owns_lease - Check if lease conflict was resolved
4904  * @fl: Lock state to check
4905  *
4906  * Return values:
4907  *   %true: Lease conflict was resolved
4908  *   %false: Lease conflict was not resolved.
4909  */
4910 static bool nfsd_breaker_owns_lease(struct file_lock *fl)
4911 {
4912         struct nfs4_delegation *dl = fl->fl_owner;
4913         struct svc_rqst *rqst;
4914         struct nfs4_client *clp;
4915
4916         if (!i_am_nfsd())
4917                 return false;
4918         rqst = kthread_data(current);
4919         /* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
4920         if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
4921                 return false;
4922         clp = *(rqst->rq_lease_breaker);
4923         return dl->dl_stid.sc_client == clp;
4924 }
4925
4926 static int
4927 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
4928                      struct list_head *dispose)
4929 {
4930         struct nfs4_delegation *dp = (struct nfs4_delegation *)onlist->fl_owner;
4931         struct nfs4_client *clp = dp->dl_stid.sc_client;
4932
4933         if (arg & F_UNLCK) {
4934                 if (dp->dl_recalled)
4935                         atomic_dec(&clp->cl_delegs_in_recall);
4936                 return lease_modify(onlist, arg, dispose);
4937         } else
4938                 return -EAGAIN;
4939 }
4940
4941 static const struct lock_manager_operations nfsd_lease_mng_ops = {
4942         .lm_breaker_owns_lease = nfsd_breaker_owns_lease,
4943         .lm_break = nfsd_break_deleg_cb,
4944         .lm_change = nfsd_change_deleg_cb,
4945 };
4946
4947 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
4948 {
4949         if (nfsd4_has_session(cstate))
4950                 return nfs_ok;
4951         if (seqid == so->so_seqid - 1)
4952                 return nfserr_replay_me;
4953         if (seqid == so->so_seqid)
4954                 return nfs_ok;
4955         return nfserr_bad_seqid;
4956 }
4957
4958 static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
4959                                                 struct nfsd_net *nn)
4960 {
4961         struct nfs4_client *found;
4962
4963         spin_lock(&nn->client_lock);
4964         found = find_confirmed_client(clid, sessions, nn);
4965         if (found)
4966                 atomic_inc(&found->cl_rpc_users);
4967         spin_unlock(&nn->client_lock);
4968         return found;
4969 }
4970
4971 static __be32 set_client(clientid_t *clid,
4972                 struct nfsd4_compound_state *cstate,
4973                 struct nfsd_net *nn)
4974 {
4975         if (cstate->clp) {
4976                 if (!same_clid(&cstate->clp->cl_clientid, clid))
4977                         return nfserr_stale_clientid;
4978                 return nfs_ok;
4979         }
4980         if (STALE_CLIENTID(clid, nn))
4981                 return nfserr_stale_clientid;
4982         /*
4983          * We're in the 4.0 case (otherwise the SEQUENCE op would have
4984          * set cstate->clp), so session = false:
4985          */
4986         cstate->clp = lookup_clientid(clid, false, nn);
4987         if (!cstate->clp)
4988                 return nfserr_expired;
4989         return nfs_ok;
4990 }
4991
4992 __be32
4993 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4994                     struct nfsd4_open *open, struct nfsd_net *nn)
4995 {
4996         clientid_t *clientid = &open->op_clientid;
4997         struct nfs4_client *clp = NULL;
4998         unsigned int strhashval;
4999         struct nfs4_openowner *oo = NULL;
5000         __be32 status;
5001
5002         /*
5003          * In case we need it later, after we've already created the
5004          * file and don't want to risk a further failure:
5005          */
5006         open->op_file = nfsd4_alloc_file();
5007         if (open->op_file == NULL)
5008                 return nfserr_jukebox;
5009
5010         status = set_client(clientid, cstate, nn);
5011         if (status)
5012                 return status;
5013         clp = cstate->clp;
5014
5015         strhashval = ownerstr_hashval(&open->op_owner);
5016         oo = find_openstateowner_str(strhashval, open, clp);
5017         open->op_openowner = oo;
5018         if (!oo) {
5019                 goto new_owner;
5020         }
5021         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5022                 /* Replace unconfirmed owners without checking for replay. */
5023                 release_openowner(oo);
5024                 open->op_openowner = NULL;
5025                 goto new_owner;
5026         }
5027         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
5028         if (status)
5029                 return status;
5030         goto alloc_stateid;
5031 new_owner:
5032         oo = alloc_init_open_stateowner(strhashval, open, cstate);
5033         if (oo == NULL)
5034                 return nfserr_jukebox;
5035         open->op_openowner = oo;
5036 alloc_stateid:
5037         open->op_stp = nfs4_alloc_open_stateid(clp);
5038         if (!open->op_stp)
5039                 return nfserr_jukebox;
5040
5041         if (nfsd4_has_session(cstate) &&
5042             (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
5043                 open->op_odstate = alloc_clnt_odstate(clp);
5044                 if (!open->op_odstate)
5045                         return nfserr_jukebox;
5046         }
5047
5048         return nfs_ok;
5049 }
5050
5051 static inline __be32
5052 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
5053 {
5054         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
5055                 return nfserr_openmode;
5056         else
5057                 return nfs_ok;
5058 }
5059
5060 static int share_access_to_flags(u32 share_access)
5061 {
5062         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
5063 }
5064
5065 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
5066 {
5067         struct nfs4_stid *ret;
5068
5069         ret = find_stateid_by_type(cl, s,
5070                                 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
5071         if (!ret)
5072                 return NULL;
5073         return delegstateid(ret);
5074 }
5075
5076 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
5077 {
5078         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
5079                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
5080 }
5081
5082 static __be32
5083 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
5084                 struct nfs4_delegation **dp)
5085 {
5086         int flags;
5087         __be32 status = nfserr_bad_stateid;
5088         struct nfs4_delegation *deleg;
5089
5090         deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
5091         if (deleg == NULL)
5092                 goto out;
5093         if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
5094                 nfs4_put_stid(&deleg->dl_stid);
5095                 if (cl->cl_minorversion)
5096                         status = nfserr_deleg_revoked;
5097                 goto out;
5098         }
5099         flags = share_access_to_flags(open->op_share_access);
5100         status = nfs4_check_delegmode(deleg, flags);
5101         if (status) {
5102                 nfs4_put_stid(&deleg->dl_stid);
5103                 goto out;
5104         }
5105         *dp = deleg;
5106 out:
5107         if (!nfsd4_is_deleg_cur(open))
5108                 return nfs_ok;
5109         if (status)
5110                 return status;
5111         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5112         return nfs_ok;
5113 }
5114
5115 static inline int nfs4_access_to_access(u32 nfs4_access)
5116 {
5117         int flags = 0;
5118
5119         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
5120                 flags |= NFSD_MAY_READ;
5121         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
5122                 flags |= NFSD_MAY_WRITE;
5123         return flags;
5124 }
5125
5126 static inline __be32
5127 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
5128                 struct nfsd4_open *open)
5129 {
5130         struct iattr iattr = {
5131                 .ia_valid = ATTR_SIZE,
5132                 .ia_size = 0,
5133         };
5134         struct nfsd_attrs attrs = {
5135                 .na_iattr       = &iattr,
5136         };
5137         if (!open->op_truncate)
5138                 return 0;
5139         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
5140                 return nfserr_inval;
5141         return nfsd_setattr(rqstp, fh, &attrs, 0, (time64_t)0);
5142 }
5143
5144 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
5145                 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5146                 struct nfsd4_open *open, bool new_stp)
5147 {
5148         struct nfsd_file *nf = NULL;
5149         __be32 status;
5150         int oflag = nfs4_access_to_omode(open->op_share_access);
5151         int access = nfs4_access_to_access(open->op_share_access);
5152         unsigned char old_access_bmap, old_deny_bmap;
5153
5154         spin_lock(&fp->fi_lock);
5155
5156         /*
5157          * Are we trying to set a deny mode that would conflict with
5158          * current access?
5159          */
5160         status = nfs4_file_check_deny(fp, open->op_share_deny);
5161         if (status != nfs_ok) {
5162                 if (status != nfserr_share_denied) {
5163                         spin_unlock(&fp->fi_lock);
5164                         goto out;
5165                 }
5166                 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5167                                 stp, open->op_share_deny, false))
5168                         status = nfserr_jukebox;
5169                 spin_unlock(&fp->fi_lock);
5170                 goto out;
5171         }
5172
5173         /* set access to the file */
5174         status = nfs4_file_get_access(fp, open->op_share_access);
5175         if (status != nfs_ok) {
5176                 if (status != nfserr_share_denied) {
5177                         spin_unlock(&fp->fi_lock);
5178                         goto out;
5179                 }
5180                 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5181                                 stp, open->op_share_access, true))
5182                         status = nfserr_jukebox;
5183                 spin_unlock(&fp->fi_lock);
5184                 goto out;
5185         }
5186
5187         /* Set access bits in stateid */
5188         old_access_bmap = stp->st_access_bmap;
5189         set_access(open->op_share_access, stp);
5190
5191         /* Set new deny mask */
5192         old_deny_bmap = stp->st_deny_bmap;
5193         set_deny(open->op_share_deny, stp);
5194         fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5195
5196         if (!fp->fi_fds[oflag]) {
5197                 spin_unlock(&fp->fi_lock);
5198
5199                 if (!open->op_filp) {
5200                         status = nfsd_file_acquire(rqstp, cur_fh, access, &nf);
5201                         if (status != nfs_ok)
5202                                 goto out_put_access;
5203                 } else {
5204                         status = nfsd_file_create(rqstp, cur_fh, access, &nf);
5205                         if (status != nfs_ok)
5206                                 goto out_put_access;
5207                         nf->nf_file = open->op_filp;
5208                         open->op_filp = NULL;
5209                         trace_nfsd_file_create(rqstp, access, nf);
5210                 }
5211
5212                 spin_lock(&fp->fi_lock);
5213                 if (!fp->fi_fds[oflag]) {
5214                         fp->fi_fds[oflag] = nf;
5215                         nf = NULL;
5216                 }
5217         }
5218         spin_unlock(&fp->fi_lock);
5219         if (nf)
5220                 nfsd_file_put(nf);
5221
5222         status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
5223                                                                 access));
5224         if (status)
5225                 goto out_put_access;
5226
5227         status = nfsd4_truncate(rqstp, cur_fh, open);
5228         if (status)
5229                 goto out_put_access;
5230 out:
5231         return status;
5232 out_put_access:
5233         stp->st_access_bmap = old_access_bmap;
5234         nfs4_file_put_access(fp, open->op_share_access);
5235         reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
5236         goto out;
5237 }
5238
5239 static __be32
5240 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
5241                 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5242                 struct nfsd4_open *open)
5243 {
5244         __be32 status;
5245         unsigned char old_deny_bmap = stp->st_deny_bmap;
5246
5247         if (!test_access(open->op_share_access, stp))
5248                 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
5249
5250         /* test and set deny mode */
5251         spin_lock(&fp->fi_lock);
5252         status = nfs4_file_check_deny(fp, open->op_share_deny);
5253         if (status == nfs_ok) {
5254                 if (status != nfserr_share_denied) {
5255                         set_deny(open->op_share_deny, stp);
5256                         fp->fi_share_deny |=
5257                                 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5258                 } else {
5259                         if (nfs4_resolve_deny_conflicts_locked(fp, false,
5260                                         stp, open->op_share_deny, false))
5261                                 status = nfserr_jukebox;
5262                 }
5263         }
5264         spin_unlock(&fp->fi_lock);
5265
5266         if (status != nfs_ok)
5267                 return status;
5268
5269         status = nfsd4_truncate(rqstp, cur_fh, open);
5270         if (status != nfs_ok)
5271                 reset_union_bmap_deny(old_deny_bmap, stp);
5272         return status;
5273 }
5274
5275 /* Should we give out recallable state?: */
5276 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
5277 {
5278         if (clp->cl_cb_state == NFSD4_CB_UP)
5279                 return true;
5280         /*
5281          * In the sessions case, since we don't have to establish a
5282          * separate connection for callbacks, we assume it's OK
5283          * until we hear otherwise:
5284          */
5285         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
5286 }
5287
5288 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
5289                                                 int flag)
5290 {
5291         struct file_lock *fl;
5292
5293         fl = locks_alloc_lock();
5294         if (!fl)
5295                 return NULL;
5296         fl->fl_lmops = &nfsd_lease_mng_ops;
5297         fl->fl_flags = FL_DELEG;
5298         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
5299         fl->fl_end = OFFSET_MAX;
5300         fl->fl_owner = (fl_owner_t)dp;
5301         fl->fl_pid = current->tgid;
5302         fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
5303         return fl;
5304 }
5305
5306 static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
5307                                          struct nfs4_file *fp)
5308 {
5309         struct nfs4_ol_stateid *st;
5310         struct file *f = fp->fi_deleg_file->nf_file;
5311         struct inode *ino = locks_inode(f);
5312         int writes;
5313
5314         writes = atomic_read(&ino->i_writecount);
5315         if (!writes)
5316                 return 0;
5317         /*
5318          * There could be multiple filehandles (hence multiple
5319          * nfs4_files) referencing this file, but that's not too
5320          * common; let's just give up in that case rather than
5321          * trying to go look up all the clients using that other
5322          * nfs4_file as well:
5323          */
5324         if (fp->fi_aliased)
5325                 return -EAGAIN;
5326         /*
5327          * If there's a close in progress, make sure that we see it
5328          * clear any fi_fds[] entries before we see it decrement
5329          * i_writecount:
5330          */
5331         smp_mb__after_atomic();
5332
5333         if (fp->fi_fds[O_WRONLY])
5334                 writes--;
5335         if (fp->fi_fds[O_RDWR])
5336                 writes--;
5337         if (writes > 0)
5338                 return -EAGAIN; /* There may be non-NFSv4 writers */
5339         /*
5340          * It's possible there are non-NFSv4 write opens in progress,
5341          * but if they haven't incremented i_writecount yet then they
5342          * also haven't called break lease yet; so, they'll break this
5343          * lease soon enough.  So, all that's left to check for is NFSv4
5344          * opens:
5345          */
5346         spin_lock(&fp->fi_lock);
5347         list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5348                 if (st->st_openstp == NULL /* it's an open */ &&
5349                     access_permit_write(st) &&
5350                     st->st_stid.sc_client != clp) {
5351                         spin_unlock(&fp->fi_lock);
5352                         return -EAGAIN;
5353                 }
5354         }
5355         spin_unlock(&fp->fi_lock);
5356         /*
5357          * There's a small chance that we could be racing with another
5358          * NFSv4 open.  However, any open that hasn't added itself to
5359          * the fi_stateids list also hasn't called break_lease yet; so,
5360          * they'll break this lease soon enough.
5361          */
5362         return 0;
5363 }
5364
5365 /*
5366  * It's possible that between opening the dentry and setting the delegation,
5367  * that it has been renamed or unlinked. Redo the lookup to verify that this
5368  * hasn't happened.
5369  */
5370 static int
5371 nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
5372                           struct svc_fh *parent)
5373 {
5374         struct svc_export *exp;
5375         struct dentry *child;
5376         __be32 err;
5377
5378         err = nfsd_lookup_dentry(open->op_rqstp, parent,
5379                                  open->op_fname, open->op_fnamelen,
5380                                  &exp, &child);
5381
5382         if (err)
5383                 return -EAGAIN;
5384
5385         exp_put(exp);
5386         dput(child);
5387         if (child != file_dentry(fp->fi_deleg_file->nf_file))
5388                 return -EAGAIN;
5389
5390         return 0;
5391 }
5392
5393 static struct nfs4_delegation *
5394 nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5395                     struct svc_fh *parent)
5396 {
5397         int status = 0;
5398         struct nfs4_client *clp = stp->st_stid.sc_client;
5399         struct nfs4_file *fp = stp->st_stid.sc_file;
5400         struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
5401         struct nfs4_delegation *dp;
5402         struct nfsd_file *nf;
5403         struct file_lock *fl;
5404
5405         /*
5406          * The fi_had_conflict and nfs_get_existing_delegation checks
5407          * here are just optimizations; we'll need to recheck them at
5408          * the end:
5409          */
5410         if (fp->fi_had_conflict)
5411                 return ERR_PTR(-EAGAIN);
5412
5413         nf = find_readable_file(fp);
5414         if (!nf) {
5415                 /*
5416                  * We probably could attempt another open and get a read
5417                  * delegation, but for now, don't bother until the
5418                  * client actually sends us one.
5419                  */
5420                 return ERR_PTR(-EAGAIN);
5421         }
5422         spin_lock(&state_lock);
5423         spin_lock(&fp->fi_lock);
5424         if (nfs4_delegation_exists(clp, fp))
5425                 status = -EAGAIN;
5426         else if (!fp->fi_deleg_file) {
5427                 fp->fi_deleg_file = nf;
5428                 /* increment early to prevent fi_deleg_file from being
5429                  * cleared */
5430                 fp->fi_delegees = 1;
5431                 nf = NULL;
5432         } else
5433                 fp->fi_delegees++;
5434         spin_unlock(&fp->fi_lock);
5435         spin_unlock(&state_lock);
5436         if (nf)
5437                 nfsd_file_put(nf);
5438         if (status)
5439                 return ERR_PTR(status);
5440
5441         status = -ENOMEM;
5442         dp = alloc_init_deleg(clp, fp, odstate);
5443         if (!dp)
5444                 goto out_delegees;
5445
5446         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
5447         if (!fl)
5448                 goto out_clnt_odstate;
5449
5450         status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
5451         if (fl)
5452                 locks_free_lock(fl);
5453         if (status)
5454                 goto out_clnt_odstate;
5455
5456         if (parent) {
5457                 status = nfsd4_verify_deleg_dentry(open, fp, parent);
5458                 if (status)
5459                         goto out_unlock;
5460         }
5461
5462         status = nfsd4_check_conflicting_opens(clp, fp);
5463         if (status)
5464                 goto out_unlock;
5465
5466         spin_lock(&state_lock);
5467         spin_lock(&fp->fi_lock);
5468         if (fp->fi_had_conflict)
5469                 status = -EAGAIN;
5470         else
5471                 status = hash_delegation_locked(dp, fp);
5472         spin_unlock(&fp->fi_lock);
5473         spin_unlock(&state_lock);
5474
5475         if (status)
5476                 goto out_unlock;
5477
5478         return dp;
5479 out_unlock:
5480         vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
5481 out_clnt_odstate:
5482         put_clnt_odstate(dp->dl_clnt_odstate);
5483         nfs4_put_stid(&dp->dl_stid);
5484 out_delegees:
5485         put_deleg_file(fp);
5486         return ERR_PTR(status);
5487 }
5488
5489 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
5490 {
5491         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5492         if (status == -EAGAIN)
5493                 open->op_why_no_deleg = WND4_CONTENTION;
5494         else {
5495                 open->op_why_no_deleg = WND4_RESOURCE;
5496                 switch (open->op_deleg_want) {
5497                 case NFS4_SHARE_WANT_READ_DELEG:
5498                 case NFS4_SHARE_WANT_WRITE_DELEG:
5499                 case NFS4_SHARE_WANT_ANY_DELEG:
5500                         break;
5501                 case NFS4_SHARE_WANT_CANCEL:
5502                         open->op_why_no_deleg = WND4_CANCELLED;
5503                         break;
5504                 case NFS4_SHARE_WANT_NO_DELEG:
5505                         WARN_ON_ONCE(1);
5506                 }
5507         }
5508 }
5509
5510 /*
5511  * Attempt to hand out a delegation.
5512  *
5513  * Note we don't support write delegations, and won't until the vfs has
5514  * proper support for them.
5515  */
5516 static void
5517 nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5518                      struct svc_fh *currentfh)
5519 {
5520         struct nfs4_delegation *dp;
5521         struct nfs4_openowner *oo = openowner(stp->st_stateowner);
5522         struct nfs4_client *clp = stp->st_stid.sc_client;
5523         struct svc_fh *parent = NULL;
5524         int cb_up;
5525         int status = 0;
5526
5527         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
5528         open->op_recall = 0;
5529         switch (open->op_claim_type) {
5530                 case NFS4_OPEN_CLAIM_PREVIOUS:
5531                         if (!cb_up)
5532                                 open->op_recall = 1;
5533                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
5534                                 goto out_no_deleg;
5535                         break;
5536                 case NFS4_OPEN_CLAIM_NULL:
5537                         parent = currentfh;
5538                         fallthrough;
5539                 case NFS4_OPEN_CLAIM_FH:
5540                         /*
5541                          * Let's not give out any delegations till everyone's
5542                          * had the chance to reclaim theirs, *and* until
5543                          * NLM locks have all been reclaimed:
5544                          */
5545                         if (locks_in_grace(clp->net))
5546                                 goto out_no_deleg;
5547                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5548                                 goto out_no_deleg;
5549                         break;
5550                 default:
5551                         goto out_no_deleg;
5552         }
5553         dp = nfs4_set_delegation(open, stp, parent);
5554         if (IS_ERR(dp))
5555                 goto out_no_deleg;
5556
5557         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5558
5559         trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
5560         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5561         nfs4_put_stid(&dp->dl_stid);
5562         return;
5563 out_no_deleg:
5564         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
5565         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
5566             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
5567                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
5568                 open->op_recall = 1;
5569         }
5570
5571         /* 4.1 client asking for a delegation? */
5572         if (open->op_deleg_want)
5573                 nfsd4_open_deleg_none_ext(open, status);
5574         return;
5575 }
5576
5577 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
5578                                         struct nfs4_delegation *dp)
5579 {
5580         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
5581             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5582                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5583                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
5584         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
5585                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5586                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5587                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
5588         }
5589         /* Otherwise the client must be confused wanting a delegation
5590          * it already has, therefore we don't return
5591          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
5592          */
5593 }
5594
5595 /**
5596  * nfsd4_process_open2 - finish open processing
5597  * @rqstp: the RPC transaction being executed
5598  * @current_fh: NFSv4 COMPOUND's current filehandle
5599  * @open: OPEN arguments
5600  *
5601  * If successful, (1) truncate the file if open->op_truncate was
5602  * set, (2) set open->op_stateid, (3) set open->op_delegation.
5603  *
5604  * Returns %nfs_ok on success; otherwise an nfs4stat value in
5605  * network byte order is returned.
5606  */
5607 __be32
5608 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
5609 {
5610         struct nfsd4_compoundres *resp = rqstp->rq_resp;
5611         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
5612         struct nfs4_file *fp = NULL;
5613         struct nfs4_ol_stateid *stp = NULL;
5614         struct nfs4_delegation *dp = NULL;
5615         __be32 status;
5616         bool new_stp = false;
5617
5618         /*
5619          * Lookup file; if found, lookup stateid and check open request,
5620          * and check for delegations in the process of being recalled.
5621          * If not found, create the nfs4_file struct
5622          */
5623         fp = find_or_add_file(open->op_file, current_fh);
5624         if (fp != open->op_file) {
5625                 status = nfs4_check_deleg(cl, open, &dp);
5626                 if (status)
5627                         goto out;
5628                 stp = nfsd4_find_and_lock_existing_open(fp, open);
5629         } else {
5630                 open->op_file = NULL;
5631                 status = nfserr_bad_stateid;
5632                 if (nfsd4_is_deleg_cur(open))
5633                         goto out;
5634         }
5635
5636         if (!stp) {
5637                 stp = init_open_stateid(fp, open);
5638                 if (!open->op_stp)
5639                         new_stp = true;
5640         }
5641
5642         /*
5643          * OPEN the file, or upgrade an existing OPEN.
5644          * If truncate fails, the OPEN fails.
5645          *
5646          * stp is already locked.
5647          */
5648         if (!new_stp) {
5649                 /* Stateid was found, this is an OPEN upgrade */
5650                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
5651                 if (status) {
5652                         mutex_unlock(&stp->st_mutex);
5653                         goto out;
5654                 }
5655         } else {
5656                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
5657                 if (status) {
5658                         stp->st_stid.sc_type = NFS4_CLOSED_STID;
5659                         release_open_stateid(stp);
5660                         mutex_unlock(&stp->st_mutex);
5661                         goto out;
5662                 }
5663
5664                 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
5665                                                         open->op_odstate);
5666                 if (stp->st_clnt_odstate == open->op_odstate)
5667                         open->op_odstate = NULL;
5668         }
5669
5670         nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
5671         mutex_unlock(&stp->st_mutex);
5672
5673         if (nfsd4_has_session(&resp->cstate)) {
5674                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
5675                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5676                         open->op_why_no_deleg = WND4_NOT_WANTED;
5677                         goto nodeleg;
5678                 }
5679         }
5680
5681         /*
5682         * Attempt to hand out a delegation. No error return, because the
5683         * OPEN succeeds even if we fail.
5684         */
5685         nfs4_open_delegation(open, stp, &resp->cstate.current_fh);
5686 nodeleg:
5687         status = nfs_ok;
5688         trace_nfsd_open(&stp->st_stid.sc_stateid);
5689 out:
5690         /* 4.1 client trying to upgrade/downgrade delegation? */
5691         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
5692             open->op_deleg_want)
5693                 nfsd4_deleg_xgrade_none_ext(open, dp);
5694
5695         if (fp)
5696                 put_nfs4_file(fp);
5697         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
5698                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5699         /*
5700         * To finish the open response, we just need to set the rflags.
5701         */
5702         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
5703         if (nfsd4_has_session(&resp->cstate))
5704                 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
5705         else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
5706                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
5707
5708         if (dp)
5709                 nfs4_put_stid(&dp->dl_stid);
5710         if (stp)
5711                 nfs4_put_stid(&stp->st_stid);
5712
5713         return status;
5714 }
5715
5716 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
5717                               struct nfsd4_open *open)
5718 {
5719         if (open->op_openowner) {
5720                 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
5721
5722                 nfsd4_cstate_assign_replay(cstate, so);
5723                 nfs4_put_stateowner(so);
5724         }
5725         if (open->op_file)
5726                 kmem_cache_free(file_slab, open->op_file);
5727         if (open->op_stp)
5728                 nfs4_put_stid(&open->op_stp->st_stid);
5729         if (open->op_odstate)
5730                 kmem_cache_free(odstate_slab, open->op_odstate);
5731 }
5732
5733 __be32
5734 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5735             union nfsd4_op_u *u)
5736 {
5737         clientid_t *clid = &u->renew;
5738         struct nfs4_client *clp;
5739         __be32 status;
5740         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5741
5742         trace_nfsd_clid_renew(clid);
5743         status = set_client(clid, cstate, nn);
5744         if (status)
5745                 return status;
5746         clp = cstate->clp;
5747         if (!list_empty(&clp->cl_delegations)
5748                         && clp->cl_cb_state != NFSD4_CB_UP)
5749                 return nfserr_cb_path_down;
5750         return nfs_ok;
5751 }
5752
5753 void
5754 nfsd4_end_grace(struct nfsd_net *nn)
5755 {
5756         /* do nothing if grace period already ended */
5757         if (nn->grace_ended)
5758                 return;
5759
5760         trace_nfsd_grace_complete(nn);
5761         nn->grace_ended = true;
5762         /*
5763          * If the server goes down again right now, an NFSv4
5764          * client will still be allowed to reclaim after it comes back up,
5765          * even if it hasn't yet had a chance to reclaim state this time.
5766          *
5767          */
5768         nfsd4_record_grace_done(nn);
5769         /*
5770          * At this point, NFSv4 clients can still reclaim.  But if the
5771          * server crashes, any that have not yet reclaimed will be out
5772          * of luck on the next boot.
5773          *
5774          * (NFSv4.1+ clients are considered to have reclaimed once they
5775          * call RECLAIM_COMPLETE.  NFSv4.0 clients are considered to
5776          * have reclaimed after their first OPEN.)
5777          */
5778         locks_end_grace(&nn->nfsd4_manager);
5779         /*
5780          * At this point, and once lockd and/or any other containers
5781          * exit their grace period, further reclaims will fail and
5782          * regular locking can resume.
5783          */
5784 }
5785
5786 /*
5787  * If we've waited a lease period but there are still clients trying to
5788  * reclaim, wait a little longer to give them a chance to finish.
5789  */
5790 static bool clients_still_reclaiming(struct nfsd_net *nn)
5791 {
5792         time64_t double_grace_period_end = nn->boot_time +
5793                                            2 * nn->nfsd4_lease;
5794
5795         if (nn->track_reclaim_completes &&
5796                         atomic_read(&nn->nr_reclaim_complete) ==
5797                         nn->reclaim_str_hashtbl_size)
5798                 return false;
5799         if (!nn->somebody_reclaimed)
5800                 return false;
5801         nn->somebody_reclaimed = false;
5802         /*
5803          * If we've given them *two* lease times to reclaim, and they're
5804          * still not done, give up:
5805          */
5806         if (ktime_get_boottime_seconds() > double_grace_period_end)
5807                 return false;
5808         return true;
5809 }
5810
5811 struct laundry_time {
5812         time64_t cutoff;
5813         time64_t new_timeo;
5814 };
5815
5816 static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
5817 {
5818         time64_t time_remaining;
5819
5820         if (last_refresh < lt->cutoff)
5821                 return true;
5822         time_remaining = last_refresh - lt->cutoff;
5823         lt->new_timeo = min(lt->new_timeo, time_remaining);
5824         return false;
5825 }
5826
5827 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
5828 void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
5829 {
5830         spin_lock_init(&nn->nfsd_ssc_lock);
5831         INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
5832         init_waitqueue_head(&nn->nfsd_ssc_waitq);
5833 }
5834 EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
5835
5836 /*
5837  * This is called when nfsd is being shutdown, after all inter_ssc
5838  * cleanup were done, to destroy the ssc delayed unmount list.
5839  */
5840 static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
5841 {
5842         struct nfsd4_ssc_umount_item *ni = NULL;
5843         struct nfsd4_ssc_umount_item *tmp;
5844
5845         spin_lock(&nn->nfsd_ssc_lock);
5846         list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
5847                 list_del(&ni->nsui_list);
5848                 spin_unlock(&nn->nfsd_ssc_lock);
5849                 mntput(ni->nsui_vfsmount);
5850                 kfree(ni);
5851                 spin_lock(&nn->nfsd_ssc_lock);
5852         }
5853         spin_unlock(&nn->nfsd_ssc_lock);
5854 }
5855
5856 static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
5857 {
5858         bool do_wakeup = false;
5859         struct nfsd4_ssc_umount_item *ni = NULL;
5860         struct nfsd4_ssc_umount_item *tmp;
5861
5862         spin_lock(&nn->nfsd_ssc_lock);
5863         list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
5864                 if (time_after(jiffies, ni->nsui_expire)) {
5865                         if (refcount_read(&ni->nsui_refcnt) > 1)
5866                                 continue;
5867
5868                         /* mark being unmount */
5869                         ni->nsui_busy = true;
5870                         spin_unlock(&nn->nfsd_ssc_lock);
5871                         mntput(ni->nsui_vfsmount);
5872                         spin_lock(&nn->nfsd_ssc_lock);
5873
5874                         /* waiters need to start from begin of list */
5875                         list_del(&ni->nsui_list);
5876                         kfree(ni);
5877
5878                         /* wakeup ssc_connect waiters */
5879                         do_wakeup = true;
5880                         continue;
5881                 }
5882                 break;
5883         }
5884         if (do_wakeup)
5885                 wake_up_all(&nn->nfsd_ssc_waitq);
5886         spin_unlock(&nn->nfsd_ssc_lock);
5887 }
5888 #endif
5889
5890 /* Check if any lock belonging to this lockowner has any blockers */
5891 static bool
5892 nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
5893 {
5894         struct file_lock_context *ctx;
5895         struct nfs4_ol_stateid *stp;
5896         struct nfs4_file *nf;
5897
5898         list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
5899                 nf = stp->st_stid.sc_file;
5900                 ctx = nf->fi_inode->i_flctx;
5901                 if (!ctx)
5902                         continue;
5903                 if (locks_owner_has_blockers(ctx, lo))
5904                         return true;
5905         }
5906         return false;
5907 }
5908
5909 static bool
5910 nfs4_anylock_blockers(struct nfs4_client *clp)
5911 {
5912         int i;
5913         struct nfs4_stateowner *so;
5914         struct nfs4_lockowner *lo;
5915
5916         if (atomic_read(&clp->cl_delegs_in_recall))
5917                 return true;
5918         spin_lock(&clp->cl_lock);
5919         for (i = 0; i < OWNER_HASH_SIZE; i++) {
5920                 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
5921                                 so_strhash) {
5922                         if (so->so_is_open_owner)
5923                                 continue;
5924                         lo = lockowner(so);
5925                         if (nfs4_lockowner_has_blockers(lo)) {
5926                                 spin_unlock(&clp->cl_lock);
5927                                 return true;
5928                         }
5929                 }
5930         }
5931         spin_unlock(&clp->cl_lock);
5932         return false;
5933 }
5934
5935 static void
5936 nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
5937                                 struct laundry_time *lt)
5938 {
5939         unsigned int maxreap, reapcnt = 0;
5940         struct list_head *pos, *next;
5941         struct nfs4_client *clp;
5942
5943         maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
5944                         NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
5945         INIT_LIST_HEAD(reaplist);
5946         spin_lock(&nn->client_lock);
5947         list_for_each_safe(pos, next, &nn->client_lru) {
5948                 clp = list_entry(pos, struct nfs4_client, cl_lru);
5949                 if (clp->cl_state == NFSD4_EXPIRABLE)
5950                         goto exp_client;
5951                 if (!state_expired(lt, clp->cl_time))
5952                         break;
5953                 if (!atomic_read(&clp->cl_rpc_users)) {
5954                         if (clp->cl_state == NFSD4_ACTIVE)
5955                                 atomic_inc(&nn->nfsd_courtesy_clients);
5956                         clp->cl_state = NFSD4_COURTESY;
5957                 }
5958                 if (!client_has_state(clp))
5959                         goto exp_client;
5960                 if (!nfs4_anylock_blockers(clp))
5961                         if (reapcnt >= maxreap)
5962                                 continue;
5963 exp_client:
5964                 if (!mark_client_expired_locked(clp)) {
5965                         list_add(&clp->cl_lru, reaplist);
5966                         reapcnt++;
5967                 }
5968         }
5969         spin_unlock(&nn->client_lock);
5970 }
5971
5972 static void
5973 nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
5974                                 struct list_head *reaplist)
5975 {
5976         unsigned int maxreap = 0, reapcnt = 0;
5977         struct list_head *pos, *next;
5978         struct nfs4_client *clp;
5979
5980         maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
5981         INIT_LIST_HEAD(reaplist);
5982
5983         spin_lock(&nn->client_lock);
5984         list_for_each_safe(pos, next, &nn->client_lru) {
5985                 clp = list_entry(pos, struct nfs4_client, cl_lru);
5986                 if (clp->cl_state == NFSD4_ACTIVE)
5987                         break;
5988                 if (reapcnt >= maxreap)
5989                         break;
5990                 if (!mark_client_expired_locked(clp)) {
5991                         list_add(&clp->cl_lru, reaplist);
5992                         reapcnt++;
5993                 }
5994         }
5995         spin_unlock(&nn->client_lock);
5996 }
5997
5998 static void
5999 nfs4_process_client_reaplist(struct list_head *reaplist)
6000 {
6001         struct list_head *pos, *next;
6002         struct nfs4_client *clp;
6003
6004         list_for_each_safe(pos, next, reaplist) {
6005                 clp = list_entry(pos, struct nfs4_client, cl_lru);
6006                 trace_nfsd_clid_purged(&clp->cl_clientid);
6007                 list_del_init(&clp->cl_lru);
6008                 expire_client(clp);
6009         }
6010 }
6011
6012 static time64_t
6013 nfs4_laundromat(struct nfsd_net *nn)
6014 {
6015         struct nfs4_openowner *oo;
6016         struct nfs4_delegation *dp;
6017         struct nfs4_ol_stateid *stp;
6018         struct nfsd4_blocked_lock *nbl;
6019         struct list_head *pos, *next, reaplist;
6020         struct laundry_time lt = {
6021                 .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
6022                 .new_timeo = nn->nfsd4_lease
6023         };
6024         struct nfs4_cpntf_state *cps;
6025         copy_stateid_t *cps_t;
6026         int i;
6027
6028         if (clients_still_reclaiming(nn)) {
6029                 lt.new_timeo = 0;
6030                 goto out;
6031         }
6032         nfsd4_end_grace(nn);
6033
6034         spin_lock(&nn->s2s_cp_lock);
6035         idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
6036                 cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
6037                 if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
6038                                 state_expired(&lt, cps->cpntf_time))
6039                         _free_cpntf_state_locked(nn, cps);
6040         }
6041         spin_unlock(&nn->s2s_cp_lock);
6042         nfs4_get_client_reaplist(nn, &reaplist, &lt);
6043         nfs4_process_client_reaplist(&reaplist);
6044
6045         spin_lock(&state_lock);
6046         list_for_each_safe(pos, next, &nn->del_recall_lru) {
6047                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6048                 if (!state_expired(&lt, dp->dl_time))
6049                         break;
6050                 WARN_ON(!unhash_delegation_locked(dp));
6051                 list_add(&dp->dl_recall_lru, &reaplist);
6052         }
6053         spin_unlock(&state_lock);
6054         while (!list_empty(&reaplist)) {
6055                 dp = list_first_entry(&reaplist, struct nfs4_delegation,
6056                                         dl_recall_lru);
6057                 list_del_init(&dp->dl_recall_lru);
6058                 revoke_delegation(dp);
6059         }
6060
6061         spin_lock(&nn->client_lock);
6062         while (!list_empty(&nn->close_lru)) {
6063                 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
6064                                         oo_close_lru);
6065                 if (!state_expired(&lt, oo->oo_time))
6066                         break;
6067                 list_del_init(&oo->oo_close_lru);
6068                 stp = oo->oo_last_closed_stid;
6069                 oo->oo_last_closed_stid = NULL;
6070                 spin_unlock(&nn->client_lock);
6071                 nfs4_put_stid(&stp->st_stid);
6072                 spin_lock(&nn->client_lock);
6073         }
6074         spin_unlock(&nn->client_lock);
6075
6076         /*
6077          * It's possible for a client to try and acquire an already held lock
6078          * that is being held for a long time, and then lose interest in it.
6079          * So, we clean out any un-revisited request after a lease period
6080          * under the assumption that the client is no longer interested.
6081          *
6082          * RFC5661, sec. 9.6 states that the client must not rely on getting
6083          * notifications and must continue to poll for locks, even when the
6084          * server supports them. Thus this shouldn't lead to clients blocking
6085          * indefinitely once the lock does become free.
6086          */
6087         BUG_ON(!list_empty(&reaplist));
6088         spin_lock(&nn->blocked_locks_lock);
6089         while (!list_empty(&nn->blocked_locks_lru)) {
6090                 nbl = list_first_entry(&nn->blocked_locks_lru,
6091                                         struct nfsd4_blocked_lock, nbl_lru);
6092                 if (!state_expired(&lt, nbl->nbl_time))
6093                         break;
6094                 list_move(&nbl->nbl_lru, &reaplist);
6095                 list_del_init(&nbl->nbl_list);
6096         }
6097         spin_unlock(&nn->blocked_locks_lock);
6098
6099         while (!list_empty(&reaplist)) {
6100                 nbl = list_first_entry(&reaplist,
6101                                         struct nfsd4_blocked_lock, nbl_lru);
6102                 list_del_init(&nbl->nbl_lru);
6103                 free_blocked_lock(nbl);
6104         }
6105 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
6106         /* service the server-to-server copy delayed unmount list */
6107         nfsd4_ssc_expire_umount(nn);
6108 #endif
6109 out:
6110         return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
6111 }
6112
6113 static void laundromat_main(struct work_struct *);
6114
6115 static void
6116 laundromat_main(struct work_struct *laundry)
6117 {
6118         time64_t t;
6119         struct delayed_work *dwork = to_delayed_work(laundry);
6120         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6121                                            laundromat_work);
6122
6123         t = nfs4_laundromat(nn);
6124         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
6125 }
6126
6127 static void
6128 courtesy_client_reaper(struct work_struct *reaper)
6129 {
6130         struct list_head reaplist;
6131         struct delayed_work *dwork = to_delayed_work(reaper);
6132         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6133                                         nfsd_shrinker_work);
6134
6135         nfs4_get_courtesy_client_reaplist(nn, &reaplist);
6136         nfs4_process_client_reaplist(&reaplist);
6137 }
6138
6139 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
6140 {
6141         if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
6142                 return nfserr_bad_stateid;
6143         return nfs_ok;
6144 }
6145
6146 static
6147 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
6148 {
6149         __be32 status = nfserr_openmode;
6150
6151         /* For lock stateid's, we test the parent open, not the lock: */
6152         if (stp->st_openstp)
6153                 stp = stp->st_openstp;
6154         if ((flags & WR_STATE) && !access_permit_write(stp))
6155                 goto out;
6156         if ((flags & RD_STATE) && !access_permit_read(stp))
6157                 goto out;
6158         status = nfs_ok;
6159 out:
6160         return status;
6161 }
6162
6163 static inline __be32
6164 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
6165 {
6166         if (ONE_STATEID(stateid) && (flags & RD_STATE))
6167                 return nfs_ok;
6168         else if (opens_in_grace(net)) {
6169                 /* Answer in remaining cases depends on existence of
6170                  * conflicting state; so we must wait out the grace period. */
6171                 return nfserr_grace;
6172         } else if (flags & WR_STATE)
6173                 return nfs4_share_conflict(current_fh,
6174                                 NFS4_SHARE_DENY_WRITE);
6175         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
6176                 return nfs4_share_conflict(current_fh,
6177                                 NFS4_SHARE_DENY_READ);
6178 }
6179
6180 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
6181 {
6182         /*
6183          * When sessions are used the stateid generation number is ignored
6184          * when it is zero.
6185          */
6186         if (has_session && in->si_generation == 0)
6187                 return nfs_ok;
6188
6189         if (in->si_generation == ref->si_generation)
6190                 return nfs_ok;
6191
6192         /* If the client sends us a stateid from the future, it's buggy: */
6193         if (nfsd4_stateid_generation_after(in, ref))
6194                 return nfserr_bad_stateid;
6195         /*
6196          * However, we could see a stateid from the past, even from a
6197          * non-buggy client.  For example, if the client sends a lock
6198          * while some IO is outstanding, the lock may bump si_generation
6199          * while the IO is still in flight.  The client could avoid that
6200          * situation by waiting for responses on all the IO requests,
6201          * but better performance may result in retrying IO that
6202          * receives an old_stateid error if requests are rarely
6203          * reordered in flight:
6204          */
6205         return nfserr_old_stateid;
6206 }
6207
6208 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
6209 {
6210         __be32 ret;
6211
6212         spin_lock(&s->sc_lock);
6213         ret = nfsd4_verify_open_stid(s);
6214         if (ret == nfs_ok)
6215                 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
6216         spin_unlock(&s->sc_lock);
6217         return ret;
6218 }
6219
6220 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
6221 {
6222         if (ols->st_stateowner->so_is_open_owner &&
6223             !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
6224                 return nfserr_bad_stateid;
6225         return nfs_ok;
6226 }
6227
6228 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
6229 {
6230         struct nfs4_stid *s;
6231         __be32 status = nfserr_bad_stateid;
6232
6233         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6234                 CLOSE_STATEID(stateid))
6235                 return status;
6236         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid))
6237                 return status;
6238         spin_lock(&cl->cl_lock);
6239         s = find_stateid_locked(cl, stateid);
6240         if (!s)
6241                 goto out_unlock;
6242         status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
6243         if (status)
6244                 goto out_unlock;
6245         switch (s->sc_type) {
6246         case NFS4_DELEG_STID:
6247                 status = nfs_ok;
6248                 break;
6249         case NFS4_REVOKED_DELEG_STID:
6250                 status = nfserr_deleg_revoked;
6251                 break;
6252         case NFS4_OPEN_STID:
6253         case NFS4_LOCK_STID:
6254                 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
6255                 break;
6256         default:
6257                 printk("unknown stateid type %x\n", s->sc_type);
6258                 fallthrough;
6259         case NFS4_CLOSED_STID:
6260         case NFS4_CLOSED_DELEG_STID:
6261                 status = nfserr_bad_stateid;
6262         }
6263 out_unlock:
6264         spin_unlock(&cl->cl_lock);
6265         return status;
6266 }
6267
6268 __be32
6269 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
6270                      stateid_t *stateid, unsigned char typemask,
6271                      struct nfs4_stid **s, struct nfsd_net *nn)
6272 {
6273         __be32 status;
6274         struct nfs4_stid *stid;
6275         bool return_revoked = false;
6276
6277         /*
6278          *  only return revoked delegations if explicitly asked.
6279          *  otherwise we report revoked or bad_stateid status.
6280          */
6281         if (typemask & NFS4_REVOKED_DELEG_STID)
6282                 return_revoked = true;
6283         else if (typemask & NFS4_DELEG_STID)
6284                 typemask |= NFS4_REVOKED_DELEG_STID;
6285
6286         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6287                 CLOSE_STATEID(stateid))
6288                 return nfserr_bad_stateid;
6289         status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
6290         if (status == nfserr_stale_clientid) {
6291                 if (cstate->session)
6292                         return nfserr_bad_stateid;
6293                 return nfserr_stale_stateid;
6294         }
6295         if (status)
6296                 return status;
6297         stid = find_stateid_by_type(cstate->clp, stateid, typemask);
6298         if (!stid)
6299                 return nfserr_bad_stateid;
6300         if ((stid->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
6301                 nfs4_put_stid(stid);
6302                 if (cstate->minorversion)
6303                         return nfserr_deleg_revoked;
6304                 return nfserr_bad_stateid;
6305         }
6306         *s = stid;
6307         return nfs_ok;
6308 }
6309
6310 static struct nfsd_file *
6311 nfs4_find_file(struct nfs4_stid *s, int flags)
6312 {
6313         if (!s)
6314                 return NULL;
6315
6316         switch (s->sc_type) {
6317         case NFS4_DELEG_STID:
6318                 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
6319                         return NULL;
6320                 return nfsd_file_get(s->sc_file->fi_deleg_file);
6321         case NFS4_OPEN_STID:
6322         case NFS4_LOCK_STID:
6323                 if (flags & RD_STATE)
6324                         return find_readable_file(s->sc_file);
6325                 else
6326                         return find_writeable_file(s->sc_file);
6327         }
6328
6329         return NULL;
6330 }
6331
6332 static __be32
6333 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
6334 {
6335         __be32 status;
6336
6337         status = nfsd4_check_openowner_confirmed(ols);
6338         if (status)
6339                 return status;
6340         return nfs4_check_openmode(ols, flags);
6341 }
6342
6343 static __be32
6344 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
6345                 struct nfsd_file **nfp, int flags)
6346 {
6347         int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
6348         struct nfsd_file *nf;
6349         __be32 status;
6350
6351         nf = nfs4_find_file(s, flags);
6352         if (nf) {
6353                 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
6354                                 acc | NFSD_MAY_OWNER_OVERRIDE);
6355                 if (status) {
6356                         nfsd_file_put(nf);
6357                         goto out;
6358                 }
6359         } else {
6360                 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
6361                 if (status)
6362                         return status;
6363         }
6364         *nfp = nf;
6365 out:
6366         return status;
6367 }
6368 static void
6369 _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6370 {
6371         WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
6372         if (!refcount_dec_and_test(&cps->cp_stateid.cs_count))
6373                 return;
6374         list_del(&cps->cp_list);
6375         idr_remove(&nn->s2s_cp_stateids,
6376                    cps->cp_stateid.cs_stid.si_opaque.so_id);
6377         kfree(cps);
6378 }
6379 /*
6380  * A READ from an inter server to server COPY will have a
6381  * copy stateid. Look up the copy notify stateid from the
6382  * idr structure and take a reference on it.
6383  */
6384 __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6385                           struct nfs4_client *clp,
6386                           struct nfs4_cpntf_state **cps)
6387 {
6388         copy_stateid_t *cps_t;
6389         struct nfs4_cpntf_state *state = NULL;
6390
6391         if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
6392                 return nfserr_bad_stateid;
6393         spin_lock(&nn->s2s_cp_lock);
6394         cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
6395         if (cps_t) {
6396                 state = container_of(cps_t, struct nfs4_cpntf_state,
6397                                      cp_stateid);
6398                 if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
6399                         state = NULL;
6400                         goto unlock;
6401                 }
6402                 if (!clp)
6403                         refcount_inc(&state->cp_stateid.cs_count);
6404                 else
6405                         _free_cpntf_state_locked(nn, state);
6406         }
6407 unlock:
6408         spin_unlock(&nn->s2s_cp_lock);
6409         if (!state)
6410                 return nfserr_bad_stateid;
6411         if (!clp && state)
6412                 *cps = state;
6413         return 0;
6414 }
6415
6416 static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6417                                struct nfs4_stid **stid)
6418 {
6419         __be32 status;
6420         struct nfs4_cpntf_state *cps = NULL;
6421         struct nfs4_client *found;
6422
6423         status = manage_cpntf_state(nn, st, NULL, &cps);
6424         if (status)
6425                 return status;
6426
6427         cps->cpntf_time = ktime_get_boottime_seconds();
6428
6429         status = nfserr_expired;
6430         found = lookup_clientid(&cps->cp_p_clid, true, nn);
6431         if (!found)
6432                 goto out;
6433
6434         *stid = find_stateid_by_type(found, &cps->cp_p_stateid,
6435                         NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID);
6436         if (*stid)
6437                 status = nfs_ok;
6438         else
6439                 status = nfserr_bad_stateid;
6440
6441         put_client_renew(found);
6442 out:
6443         nfs4_put_cpntf_state(nn, cps);
6444         return status;
6445 }
6446
6447 void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6448 {
6449         spin_lock(&nn->s2s_cp_lock);
6450         _free_cpntf_state_locked(nn, cps);
6451         spin_unlock(&nn->s2s_cp_lock);
6452 }
6453
6454 /*
6455  * Checks for stateid operations
6456  */
6457 __be32
6458 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
6459                 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
6460                 stateid_t *stateid, int flags, struct nfsd_file **nfp,
6461                 struct nfs4_stid **cstid)
6462 {
6463         struct net *net = SVC_NET(rqstp);
6464         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6465         struct nfs4_stid *s = NULL;
6466         __be32 status;
6467
6468         if (nfp)
6469                 *nfp = NULL;
6470
6471         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
6472                 if (cstid)
6473                         status = nfserr_bad_stateid;
6474                 else
6475                         status = check_special_stateids(net, fhp, stateid,
6476                                                                         flags);
6477                 goto done;
6478         }
6479
6480         status = nfsd4_lookup_stateid(cstate, stateid,
6481                                 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
6482                                 &s, nn);
6483         if (status == nfserr_bad_stateid)
6484                 status = find_cpntf_state(nn, stateid, &s);
6485         if (status)
6486                 return status;
6487         status = nfsd4_stid_check_stateid_generation(stateid, s,
6488                         nfsd4_has_session(cstate));
6489         if (status)
6490                 goto out;
6491
6492         switch (s->sc_type) {
6493         case NFS4_DELEG_STID:
6494                 status = nfs4_check_delegmode(delegstateid(s), flags);
6495                 break;
6496         case NFS4_OPEN_STID:
6497         case NFS4_LOCK_STID:
6498                 status = nfs4_check_olstateid(openlockstateid(s), flags);
6499                 break;
6500         default:
6501                 status = nfserr_bad_stateid;
6502                 break;
6503         }
6504         if (status)
6505                 goto out;
6506         status = nfs4_check_fh(fhp, s);
6507
6508 done:
6509         if (status == nfs_ok && nfp)
6510                 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
6511 out:
6512         if (s) {
6513                 if (!status && cstid)
6514                         *cstid = s;
6515                 else
6516                         nfs4_put_stid(s);
6517         }
6518         return status;
6519 }
6520
6521 /*
6522  * Test if the stateid is valid
6523  */
6524 __be32
6525 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6526                    union nfsd4_op_u *u)
6527 {
6528         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
6529         struct nfsd4_test_stateid_id *stateid;
6530         struct nfs4_client *cl = cstate->clp;
6531
6532         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
6533                 stateid->ts_id_status =
6534                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
6535
6536         return nfs_ok;
6537 }
6538
6539 static __be32
6540 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
6541 {
6542         struct nfs4_ol_stateid *stp = openlockstateid(s);
6543         __be32 ret;
6544
6545         ret = nfsd4_lock_ol_stateid(stp);
6546         if (ret)
6547                 goto out_put_stid;
6548
6549         ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
6550         if (ret)
6551                 goto out;
6552
6553         ret = nfserr_locks_held;
6554         if (check_for_locks(stp->st_stid.sc_file,
6555                             lockowner(stp->st_stateowner)))
6556                 goto out;
6557
6558         release_lock_stateid(stp);
6559         ret = nfs_ok;
6560
6561 out:
6562         mutex_unlock(&stp->st_mutex);
6563 out_put_stid:
6564         nfs4_put_stid(s);
6565         return ret;
6566 }
6567
6568 __be32
6569 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6570                    union nfsd4_op_u *u)
6571 {
6572         struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
6573         stateid_t *stateid = &free_stateid->fr_stateid;
6574         struct nfs4_stid *s;
6575         struct nfs4_delegation *dp;
6576         struct nfs4_client *cl = cstate->clp;
6577         __be32 ret = nfserr_bad_stateid;
6578
6579         spin_lock(&cl->cl_lock);
6580         s = find_stateid_locked(cl, stateid);
6581         if (!s)
6582                 goto out_unlock;
6583         spin_lock(&s->sc_lock);
6584         switch (s->sc_type) {
6585         case NFS4_DELEG_STID:
6586                 ret = nfserr_locks_held;
6587                 break;
6588         case NFS4_OPEN_STID:
6589                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
6590                 if (ret)
6591                         break;
6592                 ret = nfserr_locks_held;
6593                 break;
6594         case NFS4_LOCK_STID:
6595                 spin_unlock(&s->sc_lock);
6596                 refcount_inc(&s->sc_count);
6597                 spin_unlock(&cl->cl_lock);
6598                 ret = nfsd4_free_lock_stateid(stateid, s);
6599                 goto out;
6600         case NFS4_REVOKED_DELEG_STID:
6601                 spin_unlock(&s->sc_lock);
6602                 dp = delegstateid(s);
6603                 list_del_init(&dp->dl_recall_lru);
6604                 spin_unlock(&cl->cl_lock);
6605                 nfs4_put_stid(s);
6606                 ret = nfs_ok;
6607                 goto out;
6608         /* Default falls through and returns nfserr_bad_stateid */
6609         }
6610         spin_unlock(&s->sc_lock);
6611 out_unlock:
6612         spin_unlock(&cl->cl_lock);
6613 out:
6614         return ret;
6615 }
6616
6617 static inline int
6618 setlkflg (int type)
6619 {
6620         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
6621                 RD_STATE : WR_STATE;
6622 }
6623
6624 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
6625 {
6626         struct svc_fh *current_fh = &cstate->current_fh;
6627         struct nfs4_stateowner *sop = stp->st_stateowner;
6628         __be32 status;
6629
6630         status = nfsd4_check_seqid(cstate, sop, seqid);
6631         if (status)
6632                 return status;
6633         status = nfsd4_lock_ol_stateid(stp);
6634         if (status != nfs_ok)
6635                 return status;
6636         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
6637         if (status == nfs_ok)
6638                 status = nfs4_check_fh(current_fh, &stp->st_stid);
6639         if (status != nfs_ok)
6640                 mutex_unlock(&stp->st_mutex);
6641         return status;
6642 }
6643
6644 /*
6645  * Checks for sequence id mutating operations.
6646  */
6647 static __be32
6648 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6649                          stateid_t *stateid, char typemask,
6650                          struct nfs4_ol_stateid **stpp,
6651                          struct nfsd_net *nn)
6652 {
6653         __be32 status;
6654         struct nfs4_stid *s;
6655         struct nfs4_ol_stateid *stp = NULL;
6656
6657         trace_nfsd_preprocess(seqid, stateid);
6658
6659         *stpp = NULL;
6660         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
6661         if (status)
6662                 return status;
6663         stp = openlockstateid(s);
6664         nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
6665
6666         status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
6667         if (!status)
6668                 *stpp = stp;
6669         else
6670                 nfs4_put_stid(&stp->st_stid);
6671         return status;
6672 }
6673
6674 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6675                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
6676 {
6677         __be32 status;
6678         struct nfs4_openowner *oo;
6679         struct nfs4_ol_stateid *stp;
6680
6681         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
6682                                                 NFS4_OPEN_STID, &stp, nn);
6683         if (status)
6684                 return status;
6685         oo = openowner(stp->st_stateowner);
6686         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
6687                 mutex_unlock(&stp->st_mutex);
6688                 nfs4_put_stid(&stp->st_stid);
6689                 return nfserr_bad_stateid;
6690         }
6691         *stpp = stp;
6692         return nfs_ok;
6693 }
6694
6695 __be32
6696 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6697                    union nfsd4_op_u *u)
6698 {
6699         struct nfsd4_open_confirm *oc = &u->open_confirm;
6700         __be32 status;
6701         struct nfs4_openowner *oo;
6702         struct nfs4_ol_stateid *stp;
6703         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6704
6705         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
6706                         cstate->current_fh.fh_dentry);
6707
6708         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
6709         if (status)
6710                 return status;
6711
6712         status = nfs4_preprocess_seqid_op(cstate,
6713                                         oc->oc_seqid, &oc->oc_req_stateid,
6714                                         NFS4_OPEN_STID, &stp, nn);
6715         if (status)
6716                 goto out;
6717         oo = openowner(stp->st_stateowner);
6718         status = nfserr_bad_stateid;
6719         if (oo->oo_flags & NFS4_OO_CONFIRMED) {
6720                 mutex_unlock(&stp->st_mutex);
6721                 goto put_stateid;
6722         }
6723         oo->oo_flags |= NFS4_OO_CONFIRMED;
6724         nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
6725         mutex_unlock(&stp->st_mutex);
6726         trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
6727         nfsd4_client_record_create(oo->oo_owner.so_client);
6728         status = nfs_ok;
6729 put_stateid:
6730         nfs4_put_stid(&stp->st_stid);
6731 out:
6732         nfsd4_bump_seqid(cstate, status);
6733         return status;
6734 }
6735
6736 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
6737 {
6738         if (!test_access(access, stp))
6739                 return;
6740         nfs4_file_put_access(stp->st_stid.sc_file, access);
6741         clear_access(access, stp);
6742 }
6743
6744 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
6745 {
6746         switch (to_access) {
6747         case NFS4_SHARE_ACCESS_READ:
6748                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
6749                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6750                 break;
6751         case NFS4_SHARE_ACCESS_WRITE:
6752                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
6753                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6754                 break;
6755         case NFS4_SHARE_ACCESS_BOTH:
6756                 break;
6757         default:
6758                 WARN_ON_ONCE(1);
6759         }
6760 }
6761
6762 __be32
6763 nfsd4_open_downgrade(struct svc_rqst *rqstp,
6764                      struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
6765 {
6766         struct nfsd4_open_downgrade *od = &u->open_downgrade;
6767         __be32 status;
6768         struct nfs4_ol_stateid *stp;
6769         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6770
6771         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
6772                         cstate->current_fh.fh_dentry);
6773
6774         /* We don't yet support WANT bits: */
6775         if (od->od_deleg_want)
6776                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
6777                         od->od_deleg_want);
6778
6779         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
6780                                         &od->od_stateid, &stp, nn);
6781         if (status)
6782                 goto out;
6783         status = nfserr_inval;
6784         if (!test_access(od->od_share_access, stp)) {
6785                 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
6786                         stp->st_access_bmap, od->od_share_access);
6787                 goto put_stateid;
6788         }
6789         if (!test_deny(od->od_share_deny, stp)) {
6790                 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
6791                         stp->st_deny_bmap, od->od_share_deny);
6792                 goto put_stateid;
6793         }
6794         nfs4_stateid_downgrade(stp, od->od_share_access);
6795         reset_union_bmap_deny(od->od_share_deny, stp);
6796         nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
6797         status = nfs_ok;
6798 put_stateid:
6799         mutex_unlock(&stp->st_mutex);
6800         nfs4_put_stid(&stp->st_stid);
6801 out:
6802         nfsd4_bump_seqid(cstate, status);
6803         return status;
6804 }
6805
6806 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
6807 {
6808         struct nfs4_client *clp = s->st_stid.sc_client;
6809         bool unhashed;
6810         LIST_HEAD(reaplist);
6811         struct nfs4_ol_stateid *stp;
6812
6813         spin_lock(&clp->cl_lock);
6814         unhashed = unhash_open_stateid(s, &reaplist);
6815
6816         if (clp->cl_minorversion) {
6817                 if (unhashed)
6818                         put_ol_stateid_locked(s, &reaplist);
6819                 spin_unlock(&clp->cl_lock);
6820                 list_for_each_entry(stp, &reaplist, st_locks)
6821                         nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
6822                 free_ol_stateid_reaplist(&reaplist);
6823         } else {
6824                 spin_unlock(&clp->cl_lock);
6825                 free_ol_stateid_reaplist(&reaplist);
6826                 if (unhashed)
6827                         move_to_close_lru(s, clp->net);
6828         }
6829 }
6830
6831 /*
6832  * nfs4_unlock_state() called after encode
6833  */
6834 __be32
6835 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6836                 union nfsd4_op_u *u)
6837 {
6838         struct nfsd4_close *close = &u->close;
6839         __be32 status;
6840         struct nfs4_ol_stateid *stp;
6841         struct net *net = SVC_NET(rqstp);
6842         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6843
6844         dprintk("NFSD: nfsd4_close on file %pd\n",
6845                         cstate->current_fh.fh_dentry);
6846
6847         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
6848                                         &close->cl_stateid,
6849                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
6850                                         &stp, nn);
6851         nfsd4_bump_seqid(cstate, status);
6852         if (status)
6853                 goto out;
6854
6855         stp->st_stid.sc_type = NFS4_CLOSED_STID;
6856
6857         /*
6858          * Technically we don't _really_ have to increment or copy it, since
6859          * it should just be gone after this operation and we clobber the
6860          * copied value below, but we continue to do so here just to ensure
6861          * that racing ops see that there was a state change.
6862          */
6863         nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
6864
6865         nfsd4_close_open_stateid(stp);
6866         mutex_unlock(&stp->st_mutex);
6867
6868         /* v4.1+ suggests that we send a special stateid in here, since the
6869          * clients should just ignore this anyway. Since this is not useful
6870          * for v4.0 clients either, we set it to the special close_stateid
6871          * universally.
6872          *
6873          * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
6874          */
6875         memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
6876
6877         /* put reference from nfs4_preprocess_seqid_op */
6878         nfs4_put_stid(&stp->st_stid);
6879 out:
6880         return status;
6881 }
6882
6883 __be32
6884 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6885                   union nfsd4_op_u *u)
6886 {
6887         struct nfsd4_delegreturn *dr = &u->delegreturn;
6888         struct nfs4_delegation *dp;
6889         stateid_t *stateid = &dr->dr_stateid;
6890         struct nfs4_stid *s;
6891         __be32 status;
6892         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6893
6894         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6895                 return status;
6896
6897         status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
6898         if (status)
6899                 goto out;
6900         dp = delegstateid(s);
6901         status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
6902         if (status)
6903                 goto put_stateid;
6904
6905         wake_up_var(d_inode(cstate->current_fh.fh_dentry));
6906         destroy_delegation(dp);
6907 put_stateid:
6908         nfs4_put_stid(&dp->dl_stid);
6909 out:
6910         return status;
6911 }
6912
6913 /* last octet in a range */
6914 static inline u64
6915 last_byte_offset(u64 start, u64 len)
6916 {
6917         u64 end;
6918
6919         WARN_ON_ONCE(!len);
6920         end = start + len;
6921         return end > start ? end - 1: NFS4_MAX_UINT64;
6922 }
6923
6924 /*
6925  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
6926  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
6927  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
6928  * locking, this prevents us from being completely protocol-compliant.  The
6929  * real solution to this problem is to start using unsigned file offsets in
6930  * the VFS, but this is a very deep change!
6931  */
6932 static inline void
6933 nfs4_transform_lock_offset(struct file_lock *lock)
6934 {
6935         if (lock->fl_start < 0)
6936                 lock->fl_start = OFFSET_MAX;
6937         if (lock->fl_end < 0)
6938                 lock->fl_end = OFFSET_MAX;
6939 }
6940
6941 static fl_owner_t
6942 nfsd4_lm_get_owner(fl_owner_t owner)
6943 {
6944         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6945
6946         nfs4_get_stateowner(&lo->lo_owner);
6947         return owner;
6948 }
6949
6950 static void
6951 nfsd4_lm_put_owner(fl_owner_t owner)
6952 {
6953         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6954
6955         if (lo)
6956                 nfs4_put_stateowner(&lo->lo_owner);
6957 }
6958
6959 /* return pointer to struct nfs4_client if client is expirable */
6960 static bool
6961 nfsd4_lm_lock_expirable(struct file_lock *cfl)
6962 {
6963         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)cfl->fl_owner;
6964         struct nfs4_client *clp = lo->lo_owner.so_client;
6965         struct nfsd_net *nn;
6966
6967         if (try_to_expire_client(clp)) {
6968                 nn = net_generic(clp->net, nfsd_net_id);
6969                 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
6970                 return true;
6971         }
6972         return false;
6973 }
6974
6975 /* schedule laundromat to run immediately and wait for it to complete */
6976 static void
6977 nfsd4_lm_expire_lock(void)
6978 {
6979         flush_workqueue(laundry_wq);
6980 }
6981
6982 static void
6983 nfsd4_lm_notify(struct file_lock *fl)
6984 {
6985         struct nfs4_lockowner           *lo = (struct nfs4_lockowner *)fl->fl_owner;
6986         struct net                      *net = lo->lo_owner.so_client->net;
6987         struct nfsd_net                 *nn = net_generic(net, nfsd_net_id);
6988         struct nfsd4_blocked_lock       *nbl = container_of(fl,
6989                                                 struct nfsd4_blocked_lock, nbl_lock);
6990         bool queue = false;
6991
6992         /* An empty list means that something else is going to be using it */
6993         spin_lock(&nn->blocked_locks_lock);
6994         if (!list_empty(&nbl->nbl_list)) {
6995                 list_del_init(&nbl->nbl_list);
6996                 list_del_init(&nbl->nbl_lru);
6997                 queue = true;
6998         }
6999         spin_unlock(&nn->blocked_locks_lock);
7000
7001         if (queue) {
7002                 trace_nfsd_cb_notify_lock(lo, nbl);
7003                 nfsd4_run_cb(&nbl->nbl_cb);
7004         }
7005 }
7006
7007 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
7008         .lm_mod_owner = THIS_MODULE,
7009         .lm_notify = nfsd4_lm_notify,
7010         .lm_get_owner = nfsd4_lm_get_owner,
7011         .lm_put_owner = nfsd4_lm_put_owner,
7012         .lm_lock_expirable = nfsd4_lm_lock_expirable,
7013         .lm_expire_lock = nfsd4_lm_expire_lock,
7014 };
7015
7016 static inline void
7017 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
7018 {
7019         struct nfs4_lockowner *lo;
7020
7021         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
7022                 lo = (struct nfs4_lockowner *) fl->fl_owner;
7023                 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
7024                                                 GFP_KERNEL);
7025                 if (!deny->ld_owner.data)
7026                         /* We just don't care that much */
7027                         goto nevermind;
7028                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
7029         } else {
7030 nevermind:
7031                 deny->ld_owner.len = 0;
7032                 deny->ld_owner.data = NULL;
7033                 deny->ld_clientid.cl_boot = 0;
7034                 deny->ld_clientid.cl_id = 0;
7035         }
7036         deny->ld_start = fl->fl_start;
7037         deny->ld_length = NFS4_MAX_UINT64;
7038         if (fl->fl_end != NFS4_MAX_UINT64)
7039                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
7040         deny->ld_type = NFS4_READ_LT;
7041         if (fl->fl_type != F_RDLCK)
7042                 deny->ld_type = NFS4_WRITE_LT;
7043 }
7044
7045 static struct nfs4_lockowner *
7046 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
7047 {
7048         unsigned int strhashval = ownerstr_hashval(owner);
7049         struct nfs4_stateowner *so;
7050
7051         lockdep_assert_held(&clp->cl_lock);
7052
7053         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
7054                             so_strhash) {
7055                 if (so->so_is_open_owner)
7056                         continue;
7057                 if (same_owner_str(so, owner))
7058                         return lockowner(nfs4_get_stateowner(so));
7059         }
7060         return NULL;
7061 }
7062
7063 static struct nfs4_lockowner *
7064 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
7065 {
7066         struct nfs4_lockowner *lo;
7067
7068         spin_lock(&clp->cl_lock);
7069         lo = find_lockowner_str_locked(clp, owner);
7070         spin_unlock(&clp->cl_lock);
7071         return lo;
7072 }
7073
7074 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
7075 {
7076         unhash_lockowner_locked(lockowner(sop));
7077 }
7078
7079 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
7080 {
7081         struct nfs4_lockowner *lo = lockowner(sop);
7082
7083         kmem_cache_free(lockowner_slab, lo);
7084 }
7085
7086 static const struct nfs4_stateowner_operations lockowner_ops = {
7087         .so_unhash =    nfs4_unhash_lockowner,
7088         .so_free =      nfs4_free_lockowner,
7089 };
7090
7091 /*
7092  * Alloc a lock owner structure.
7093  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
7094  * occurred.
7095  *
7096  * strhashval = ownerstr_hashval
7097  */
7098 static struct nfs4_lockowner *
7099 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
7100                            struct nfs4_ol_stateid *open_stp,
7101                            struct nfsd4_lock *lock)
7102 {
7103         struct nfs4_lockowner *lo, *ret;
7104
7105         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
7106         if (!lo)
7107                 return NULL;
7108         INIT_LIST_HEAD(&lo->lo_blocked);
7109         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
7110         lo->lo_owner.so_is_open_owner = 0;
7111         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
7112         lo->lo_owner.so_ops = &lockowner_ops;
7113         spin_lock(&clp->cl_lock);
7114         ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
7115         if (ret == NULL) {
7116                 list_add(&lo->lo_owner.so_strhash,
7117                          &clp->cl_ownerstr_hashtbl[strhashval]);
7118                 ret = lo;
7119         } else
7120                 nfs4_free_stateowner(&lo->lo_owner);
7121
7122         spin_unlock(&clp->cl_lock);
7123         return ret;
7124 }
7125
7126 static struct nfs4_ol_stateid *
7127 find_lock_stateid(const struct nfs4_lockowner *lo,
7128                   const struct nfs4_ol_stateid *ost)
7129 {
7130         struct nfs4_ol_stateid *lst;
7131
7132         lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
7133
7134         /* If ost is not hashed, ost->st_locks will not be valid */
7135         if (!nfs4_ol_stateid_unhashed(ost))
7136                 list_for_each_entry(lst, &ost->st_locks, st_locks) {
7137                         if (lst->st_stateowner == &lo->lo_owner) {
7138                                 refcount_inc(&lst->st_stid.sc_count);
7139                                 return lst;
7140                         }
7141                 }
7142         return NULL;
7143 }
7144
7145 static struct nfs4_ol_stateid *
7146 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
7147                   struct nfs4_file *fp, struct inode *inode,
7148                   struct nfs4_ol_stateid *open_stp)
7149 {
7150         struct nfs4_client *clp = lo->lo_owner.so_client;
7151         struct nfs4_ol_stateid *retstp;
7152
7153         mutex_init(&stp->st_mutex);
7154         mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
7155 retry:
7156         spin_lock(&clp->cl_lock);
7157         if (nfs4_ol_stateid_unhashed(open_stp))
7158                 goto out_close;
7159         retstp = find_lock_stateid(lo, open_stp);
7160         if (retstp)
7161                 goto out_found;
7162         refcount_inc(&stp->st_stid.sc_count);
7163         stp->st_stid.sc_type = NFS4_LOCK_STID;
7164         stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
7165         get_nfs4_file(fp);
7166         stp->st_stid.sc_file = fp;
7167         stp->st_access_bmap = 0;
7168         stp->st_deny_bmap = open_stp->st_deny_bmap;
7169         stp->st_openstp = open_stp;
7170         spin_lock(&fp->fi_lock);
7171         list_add(&stp->st_locks, &open_stp->st_locks);
7172         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
7173         list_add(&stp->st_perfile, &fp->fi_stateids);
7174         spin_unlock(&fp->fi_lock);
7175         spin_unlock(&clp->cl_lock);
7176         return stp;
7177 out_found:
7178         spin_unlock(&clp->cl_lock);
7179         if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
7180                 nfs4_put_stid(&retstp->st_stid);
7181                 goto retry;
7182         }
7183         /* To keep mutex tracking happy */
7184         mutex_unlock(&stp->st_mutex);
7185         return retstp;
7186 out_close:
7187         spin_unlock(&clp->cl_lock);
7188         mutex_unlock(&stp->st_mutex);
7189         return NULL;
7190 }
7191
7192 static struct nfs4_ol_stateid *
7193 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
7194                             struct inode *inode, struct nfs4_ol_stateid *ost,
7195                             bool *new)
7196 {
7197         struct nfs4_stid *ns = NULL;
7198         struct nfs4_ol_stateid *lst;
7199         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7200         struct nfs4_client *clp = oo->oo_owner.so_client;
7201
7202         *new = false;
7203         spin_lock(&clp->cl_lock);
7204         lst = find_lock_stateid(lo, ost);
7205         spin_unlock(&clp->cl_lock);
7206         if (lst != NULL) {
7207                 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
7208                         goto out;
7209                 nfs4_put_stid(&lst->st_stid);
7210         }
7211         ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
7212         if (ns == NULL)
7213                 return NULL;
7214
7215         lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
7216         if (lst == openlockstateid(ns))
7217                 *new = true;
7218         else
7219                 nfs4_put_stid(ns);
7220 out:
7221         return lst;
7222 }
7223
7224 static int
7225 check_lock_length(u64 offset, u64 length)
7226 {
7227         return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
7228                 (length > ~offset)));
7229 }
7230
7231 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
7232 {
7233         struct nfs4_file *fp = lock_stp->st_stid.sc_file;
7234
7235         lockdep_assert_held(&fp->fi_lock);
7236
7237         if (test_access(access, lock_stp))
7238                 return;
7239         __nfs4_file_get_access(fp, access);
7240         set_access(access, lock_stp);
7241 }
7242
7243 static __be32
7244 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
7245                             struct nfs4_ol_stateid *ost,
7246                             struct nfsd4_lock *lock,
7247                             struct nfs4_ol_stateid **plst, bool *new)
7248 {
7249         __be32 status;
7250         struct nfs4_file *fi = ost->st_stid.sc_file;
7251         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7252         struct nfs4_client *cl = oo->oo_owner.so_client;
7253         struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
7254         struct nfs4_lockowner *lo;
7255         struct nfs4_ol_stateid *lst;
7256         unsigned int strhashval;
7257
7258         lo = find_lockowner_str(cl, &lock->lk_new_owner);
7259         if (!lo) {
7260                 strhashval = ownerstr_hashval(&lock->lk_new_owner);
7261                 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
7262                 if (lo == NULL)
7263                         return nfserr_jukebox;
7264         } else {
7265                 /* with an existing lockowner, seqids must be the same */
7266                 status = nfserr_bad_seqid;
7267                 if (!cstate->minorversion &&
7268                     lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
7269                         goto out;
7270         }
7271
7272         lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
7273         if (lst == NULL) {
7274                 status = nfserr_jukebox;
7275                 goto out;
7276         }
7277
7278         status = nfs_ok;
7279         *plst = lst;
7280 out:
7281         nfs4_put_stateowner(&lo->lo_owner);
7282         return status;
7283 }
7284
7285 /*
7286  *  LOCK operation
7287  */
7288 __be32
7289 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7290            union nfsd4_op_u *u)
7291 {
7292         struct nfsd4_lock *lock = &u->lock;
7293         struct nfs4_openowner *open_sop = NULL;
7294         struct nfs4_lockowner *lock_sop = NULL;
7295         struct nfs4_ol_stateid *lock_stp = NULL;
7296         struct nfs4_ol_stateid *open_stp = NULL;
7297         struct nfs4_file *fp;
7298         struct nfsd_file *nf = NULL;
7299         struct nfsd4_blocked_lock *nbl = NULL;
7300         struct file_lock *file_lock = NULL;
7301         struct file_lock *conflock = NULL;
7302         __be32 status = 0;
7303         int lkflg;
7304         int err;
7305         bool new = false;
7306         unsigned char fl_type;
7307         unsigned int fl_flags = FL_POSIX;
7308         struct net *net = SVC_NET(rqstp);
7309         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7310
7311         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
7312                 (long long) lock->lk_offset,
7313                 (long long) lock->lk_length);
7314
7315         if (check_lock_length(lock->lk_offset, lock->lk_length))
7316                  return nfserr_inval;
7317
7318         if ((status = fh_verify(rqstp, &cstate->current_fh,
7319                                 S_IFREG, NFSD_MAY_LOCK))) {
7320                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
7321                 return status;
7322         }
7323
7324         if (lock->lk_is_new) {
7325                 if (nfsd4_has_session(cstate))
7326                         /* See rfc 5661 18.10.3: given clientid is ignored: */
7327                         memcpy(&lock->lk_new_clientid,
7328                                 &cstate->clp->cl_clientid,
7329                                 sizeof(clientid_t));
7330
7331                 /* validate and update open stateid and open seqid */
7332                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
7333                                         lock->lk_new_open_seqid,
7334                                         &lock->lk_new_open_stateid,
7335                                         &open_stp, nn);
7336                 if (status)
7337                         goto out;
7338                 mutex_unlock(&open_stp->st_mutex);
7339                 open_sop = openowner(open_stp->st_stateowner);
7340                 status = nfserr_bad_stateid;
7341                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
7342                                                 &lock->lk_new_clientid))
7343                         goto out;
7344                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
7345                                                         &lock_stp, &new);
7346         } else {
7347                 status = nfs4_preprocess_seqid_op(cstate,
7348                                        lock->lk_old_lock_seqid,
7349                                        &lock->lk_old_lock_stateid,
7350                                        NFS4_LOCK_STID, &lock_stp, nn);
7351         }
7352         if (status)
7353                 goto out;
7354         lock_sop = lockowner(lock_stp->st_stateowner);
7355
7356         lkflg = setlkflg(lock->lk_type);
7357         status = nfs4_check_openmode(lock_stp, lkflg);
7358         if (status)
7359                 goto out;
7360
7361         status = nfserr_grace;
7362         if (locks_in_grace(net) && !lock->lk_reclaim)
7363                 goto out;
7364         status = nfserr_no_grace;
7365         if (!locks_in_grace(net) && lock->lk_reclaim)
7366                 goto out;
7367
7368         if (lock->lk_reclaim)
7369                 fl_flags |= FL_RECLAIM;
7370
7371         fp = lock_stp->st_stid.sc_file;
7372         switch (lock->lk_type) {
7373                 case NFS4_READW_LT:
7374                         if (nfsd4_has_session(cstate))
7375                                 fl_flags |= FL_SLEEP;
7376                         fallthrough;
7377                 case NFS4_READ_LT:
7378                         spin_lock(&fp->fi_lock);
7379                         nf = find_readable_file_locked(fp);
7380                         if (nf)
7381                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
7382                         spin_unlock(&fp->fi_lock);
7383                         fl_type = F_RDLCK;
7384                         break;
7385                 case NFS4_WRITEW_LT:
7386                         if (nfsd4_has_session(cstate))
7387                                 fl_flags |= FL_SLEEP;
7388                         fallthrough;
7389                 case NFS4_WRITE_LT:
7390                         spin_lock(&fp->fi_lock);
7391                         nf = find_writeable_file_locked(fp);
7392                         if (nf)
7393                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
7394                         spin_unlock(&fp->fi_lock);
7395                         fl_type = F_WRLCK;
7396                         break;
7397                 default:
7398                         status = nfserr_inval;
7399                 goto out;
7400         }
7401
7402         if (!nf) {
7403                 status = nfserr_openmode;
7404                 goto out;
7405         }
7406
7407         /*
7408          * Most filesystems with their own ->lock operations will block
7409          * the nfsd thread waiting to acquire the lock.  That leads to
7410          * deadlocks (we don't want every nfsd thread tied up waiting
7411          * for file locks), so don't attempt blocking lock notifications
7412          * on those filesystems:
7413          */
7414         if (nf->nf_file->f_op->lock)
7415                 fl_flags &= ~FL_SLEEP;
7416
7417         nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
7418         if (!nbl) {
7419                 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
7420                 status = nfserr_jukebox;
7421                 goto out;
7422         }
7423
7424         file_lock = &nbl->nbl_lock;
7425         file_lock->fl_type = fl_type;
7426         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
7427         file_lock->fl_pid = current->tgid;
7428         file_lock->fl_file = nf->nf_file;
7429         file_lock->fl_flags = fl_flags;
7430         file_lock->fl_lmops = &nfsd_posix_mng_ops;
7431         file_lock->fl_start = lock->lk_offset;
7432         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
7433         nfs4_transform_lock_offset(file_lock);
7434
7435         conflock = locks_alloc_lock();
7436         if (!conflock) {
7437                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7438                 status = nfserr_jukebox;
7439                 goto out;
7440         }
7441
7442         if (fl_flags & FL_SLEEP) {
7443                 nbl->nbl_time = ktime_get_boottime_seconds();
7444                 spin_lock(&nn->blocked_locks_lock);
7445                 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
7446                 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
7447                 kref_get(&nbl->nbl_kref);
7448                 spin_unlock(&nn->blocked_locks_lock);
7449         }
7450
7451         err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
7452         switch (err) {
7453         case 0: /* success! */
7454                 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
7455                 status = 0;
7456                 if (lock->lk_reclaim)
7457                         nn->somebody_reclaimed = true;
7458                 break;
7459         case FILE_LOCK_DEFERRED:
7460                 kref_put(&nbl->nbl_kref, free_nbl);
7461                 nbl = NULL;
7462                 fallthrough;
7463         case -EAGAIN:           /* conflock holds conflicting lock */
7464                 status = nfserr_denied;
7465                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
7466                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
7467                 break;
7468         case -EDEADLK:
7469                 status = nfserr_deadlock;
7470                 break;
7471         default:
7472                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
7473                 status = nfserrno(err);
7474                 break;
7475         }
7476 out:
7477         if (nbl) {
7478                 /* dequeue it if we queued it before */
7479                 if (fl_flags & FL_SLEEP) {
7480                         spin_lock(&nn->blocked_locks_lock);
7481                         if (!list_empty(&nbl->nbl_list) &&
7482                             !list_empty(&nbl->nbl_lru)) {
7483                                 list_del_init(&nbl->nbl_list);
7484                                 list_del_init(&nbl->nbl_lru);
7485                                 kref_put(&nbl->nbl_kref, free_nbl);
7486                         }
7487                         /* nbl can use one of lists to be linked to reaplist */
7488                         spin_unlock(&nn->blocked_locks_lock);
7489                 }
7490                 free_blocked_lock(nbl);
7491         }
7492         if (nf)
7493                 nfsd_file_put(nf);
7494         if (lock_stp) {
7495                 /* Bump seqid manually if the 4.0 replay owner is openowner */
7496                 if (cstate->replay_owner &&
7497                     cstate->replay_owner != &lock_sop->lo_owner &&
7498                     seqid_mutating_err(ntohl(status)))
7499                         lock_sop->lo_owner.so_seqid++;
7500
7501                 /*
7502                  * If this is a new, never-before-used stateid, and we are
7503                  * returning an error, then just go ahead and release it.
7504                  */
7505                 if (status && new)
7506                         release_lock_stateid(lock_stp);
7507
7508                 mutex_unlock(&lock_stp->st_mutex);
7509
7510                 nfs4_put_stid(&lock_stp->st_stid);
7511         }
7512         if (open_stp)
7513                 nfs4_put_stid(&open_stp->st_stid);
7514         nfsd4_bump_seqid(cstate, status);
7515         if (conflock)
7516                 locks_free_lock(conflock);
7517         return status;
7518 }
7519
7520 /*
7521  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
7522  * so we do a temporary open here just to get an open file to pass to
7523  * vfs_test_lock.
7524  */
7525 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
7526 {
7527         struct nfsd_file *nf;
7528         struct inode *inode;
7529         __be32 err;
7530
7531         err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
7532         if (err)
7533                 return err;
7534         inode = fhp->fh_dentry->d_inode;
7535         inode_lock(inode); /* to block new leases till after test_lock: */
7536         err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
7537         if (err)
7538                 goto out;
7539         lock->fl_file = nf->nf_file;
7540         err = nfserrno(vfs_test_lock(nf->nf_file, lock));
7541         lock->fl_file = NULL;
7542 out:
7543         inode_unlock(inode);
7544         nfsd_file_put(nf);
7545         return err;
7546 }
7547
7548 /*
7549  * LOCKT operation
7550  */
7551 __be32
7552 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7553             union nfsd4_op_u *u)
7554 {
7555         struct nfsd4_lockt *lockt = &u->lockt;
7556         struct file_lock *file_lock = NULL;
7557         struct nfs4_lockowner *lo = NULL;
7558         __be32 status;
7559         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7560
7561         if (locks_in_grace(SVC_NET(rqstp)))
7562                 return nfserr_grace;
7563
7564         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
7565                  return nfserr_inval;
7566
7567         if (!nfsd4_has_session(cstate)) {
7568                 status = set_client(&lockt->lt_clientid, cstate, nn);
7569                 if (status)
7570                         goto out;
7571         }
7572
7573         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7574                 goto out;
7575
7576         file_lock = locks_alloc_lock();
7577         if (!file_lock) {
7578                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7579                 status = nfserr_jukebox;
7580                 goto out;
7581         }
7582
7583         switch (lockt->lt_type) {
7584                 case NFS4_READ_LT:
7585                 case NFS4_READW_LT:
7586                         file_lock->fl_type = F_RDLCK;
7587                         break;
7588                 case NFS4_WRITE_LT:
7589                 case NFS4_WRITEW_LT:
7590                         file_lock->fl_type = F_WRLCK;
7591                         break;
7592                 default:
7593                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
7594                         status = nfserr_inval;
7595                         goto out;
7596         }
7597
7598         lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
7599         if (lo)
7600                 file_lock->fl_owner = (fl_owner_t)lo;
7601         file_lock->fl_pid = current->tgid;
7602         file_lock->fl_flags = FL_POSIX;
7603
7604         file_lock->fl_start = lockt->lt_offset;
7605         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
7606
7607         nfs4_transform_lock_offset(file_lock);
7608
7609         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
7610         if (status)
7611                 goto out;
7612
7613         if (file_lock->fl_type != F_UNLCK) {
7614                 status = nfserr_denied;
7615                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
7616         }
7617 out:
7618         if (lo)
7619                 nfs4_put_stateowner(&lo->lo_owner);
7620         if (file_lock)
7621                 locks_free_lock(file_lock);
7622         return status;
7623 }
7624
7625 __be32
7626 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7627             union nfsd4_op_u *u)
7628 {
7629         struct nfsd4_locku *locku = &u->locku;
7630         struct nfs4_ol_stateid *stp;
7631         struct nfsd_file *nf = NULL;
7632         struct file_lock *file_lock = NULL;
7633         __be32 status;
7634         int err;
7635         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7636
7637         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
7638                 (long long) locku->lu_offset,
7639                 (long long) locku->lu_length);
7640
7641         if (check_lock_length(locku->lu_offset, locku->lu_length))
7642                  return nfserr_inval;
7643
7644         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
7645                                         &locku->lu_stateid, NFS4_LOCK_STID,
7646                                         &stp, nn);
7647         if (status)
7648                 goto out;
7649         nf = find_any_file(stp->st_stid.sc_file);
7650         if (!nf) {
7651                 status = nfserr_lock_range;
7652                 goto put_stateid;
7653         }
7654         file_lock = locks_alloc_lock();
7655         if (!file_lock) {
7656                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7657                 status = nfserr_jukebox;
7658                 goto put_file;
7659         }
7660
7661         file_lock->fl_type = F_UNLCK;
7662         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
7663         file_lock->fl_pid = current->tgid;
7664         file_lock->fl_file = nf->nf_file;
7665         file_lock->fl_flags = FL_POSIX;
7666         file_lock->fl_lmops = &nfsd_posix_mng_ops;
7667         file_lock->fl_start = locku->lu_offset;
7668
7669         file_lock->fl_end = last_byte_offset(locku->lu_offset,
7670                                                 locku->lu_length);
7671         nfs4_transform_lock_offset(file_lock);
7672
7673         err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
7674         if (err) {
7675                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
7676                 goto out_nfserr;
7677         }
7678         nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
7679 put_file:
7680         nfsd_file_put(nf);
7681 put_stateid:
7682         mutex_unlock(&stp->st_mutex);
7683         nfs4_put_stid(&stp->st_stid);
7684 out:
7685         nfsd4_bump_seqid(cstate, status);
7686         if (file_lock)
7687                 locks_free_lock(file_lock);
7688         return status;
7689
7690 out_nfserr:
7691         status = nfserrno(err);
7692         goto put_file;
7693 }
7694
7695 /*
7696  * returns
7697  *      true:  locks held by lockowner
7698  *      false: no locks held by lockowner
7699  */
7700 static bool
7701 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
7702 {
7703         struct file_lock *fl;
7704         int status = false;
7705         struct nfsd_file *nf = find_any_file(fp);
7706         struct inode *inode;
7707         struct file_lock_context *flctx;
7708
7709         if (!nf) {
7710                 /* Any valid lock stateid should have some sort of access */
7711                 WARN_ON_ONCE(1);
7712                 return status;
7713         }
7714
7715         inode = locks_inode(nf->nf_file);
7716         flctx = inode->i_flctx;
7717
7718         if (flctx && !list_empty_careful(&flctx->flc_posix)) {
7719                 spin_lock(&flctx->flc_lock);
7720                 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
7721                         if (fl->fl_owner == (fl_owner_t)lowner) {
7722                                 status = true;
7723                                 break;
7724                         }
7725                 }
7726                 spin_unlock(&flctx->flc_lock);
7727         }
7728         nfsd_file_put(nf);
7729         return status;
7730 }
7731
7732 /**
7733  * nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
7734  * @rqstp: RPC transaction
7735  * @cstate: NFSv4 COMPOUND state
7736  * @u: RELEASE_LOCKOWNER arguments
7737  *
7738  * The lockowner's so_count is bumped when a lock record is added
7739  * or when copying a conflicting lock. The latter case is brief,
7740  * but can lead to fleeting false positives when looking for
7741  * locks-in-use.
7742  *
7743  * Return values:
7744  *   %nfs_ok: lockowner released or not found
7745  *   %nfserr_locks_held: lockowner still in use
7746  *   %nfserr_stale_clientid: clientid no longer active
7747  *   %nfserr_expired: clientid not recognized
7748  */
7749 __be32
7750 nfsd4_release_lockowner(struct svc_rqst *rqstp,
7751                         struct nfsd4_compound_state *cstate,
7752                         union nfsd4_op_u *u)
7753 {
7754         struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
7755         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7756         clientid_t *clid = &rlockowner->rl_clientid;
7757         struct nfs4_ol_stateid *stp;
7758         struct nfs4_lockowner *lo;
7759         struct nfs4_client *clp;
7760         LIST_HEAD(reaplist);
7761         __be32 status;
7762
7763         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
7764                 clid->cl_boot, clid->cl_id);
7765
7766         status = set_client(clid, cstate, nn);
7767         if (status)
7768                 return status;
7769         clp = cstate->clp;
7770
7771         spin_lock(&clp->cl_lock);
7772         lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
7773         if (!lo) {
7774                 spin_unlock(&clp->cl_lock);
7775                 return nfs_ok;
7776         }
7777         if (atomic_read(&lo->lo_owner.so_count) != 2) {
7778                 spin_unlock(&clp->cl_lock);
7779                 nfs4_put_stateowner(&lo->lo_owner);
7780                 return nfserr_locks_held;
7781         }
7782         unhash_lockowner_locked(lo);
7783         while (!list_empty(&lo->lo_owner.so_stateids)) {
7784                 stp = list_first_entry(&lo->lo_owner.so_stateids,
7785                                        struct nfs4_ol_stateid,
7786                                        st_perstateowner);
7787                 WARN_ON(!unhash_lock_stateid(stp));
7788                 put_ol_stateid_locked(stp, &reaplist);
7789         }
7790         spin_unlock(&clp->cl_lock);
7791
7792         free_ol_stateid_reaplist(&reaplist);
7793         remove_blocked_locks(lo);
7794         nfs4_put_stateowner(&lo->lo_owner);
7795         return nfs_ok;
7796 }
7797
7798 static inline struct nfs4_client_reclaim *
7799 alloc_reclaim(void)
7800 {
7801         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
7802 }
7803
7804 bool
7805 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
7806 {
7807         struct nfs4_client_reclaim *crp;
7808
7809         crp = nfsd4_find_reclaim_client(name, nn);
7810         return (crp && crp->cr_clp);
7811 }
7812
7813 /*
7814  * failure => all reset bets are off, nfserr_no_grace...
7815  *
7816  * The caller is responsible for freeing name.data if NULL is returned (it
7817  * will be freed in nfs4_remove_reclaim_record in the normal case).
7818  */
7819 struct nfs4_client_reclaim *
7820 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
7821                 struct nfsd_net *nn)
7822 {
7823         unsigned int strhashval;
7824         struct nfs4_client_reclaim *crp;
7825
7826         crp = alloc_reclaim();
7827         if (crp) {
7828                 strhashval = clientstr_hashval(name);
7829                 INIT_LIST_HEAD(&crp->cr_strhash);
7830                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
7831                 crp->cr_name.data = name.data;
7832                 crp->cr_name.len = name.len;
7833                 crp->cr_princhash.data = princhash.data;
7834                 crp->cr_princhash.len = princhash.len;
7835                 crp->cr_clp = NULL;
7836                 nn->reclaim_str_hashtbl_size++;
7837         }
7838         return crp;
7839 }
7840
7841 void
7842 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
7843 {
7844         list_del(&crp->cr_strhash);
7845         kfree(crp->cr_name.data);
7846         kfree(crp->cr_princhash.data);
7847         kfree(crp);
7848         nn->reclaim_str_hashtbl_size--;
7849 }
7850
7851 void
7852 nfs4_release_reclaim(struct nfsd_net *nn)
7853 {
7854         struct nfs4_client_reclaim *crp = NULL;
7855         int i;
7856
7857         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7858                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
7859                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
7860                                         struct nfs4_client_reclaim, cr_strhash);
7861                         nfs4_remove_reclaim_record(crp, nn);
7862                 }
7863         }
7864         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
7865 }
7866
7867 /*
7868  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
7869 struct nfs4_client_reclaim *
7870 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
7871 {
7872         unsigned int strhashval;
7873         struct nfs4_client_reclaim *crp = NULL;
7874
7875         strhashval = clientstr_hashval(name);
7876         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
7877                 if (compare_blob(&crp->cr_name, &name) == 0) {
7878                         return crp;
7879                 }
7880         }
7881         return NULL;
7882 }
7883
7884 __be32
7885 nfs4_check_open_reclaim(struct nfs4_client *clp)
7886 {
7887         if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
7888                 return nfserr_no_grace;
7889
7890         if (nfsd4_client_record_check(clp))
7891                 return nfserr_reclaim_bad;
7892
7893         return nfs_ok;
7894 }
7895
7896 /*
7897  * Since the lifetime of a delegation isn't limited to that of an open, a
7898  * client may quite reasonably hang on to a delegation as long as it has
7899  * the inode cached.  This becomes an obvious problem the first time a
7900  * client's inode cache approaches the size of the server's total memory.
7901  *
7902  * For now we avoid this problem by imposing a hard limit on the number
7903  * of delegations, which varies according to the server's memory size.
7904  */
7905 static void
7906 set_max_delegations(void)
7907 {
7908         /*
7909          * Allow at most 4 delegations per megabyte of RAM.  Quick
7910          * estimates suggest that in the worst case (where every delegation
7911          * is for a different inode), a delegation could take about 1.5K,
7912          * giving a worst case usage of about 6% of memory.
7913          */
7914         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7915 }
7916
7917 static int nfs4_state_create_net(struct net *net)
7918 {
7919         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7920         int i;
7921
7922         nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7923                                             sizeof(struct list_head),
7924                                             GFP_KERNEL);
7925         if (!nn->conf_id_hashtbl)
7926                 goto err;
7927         nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7928                                               sizeof(struct list_head),
7929                                               GFP_KERNEL);
7930         if (!nn->unconf_id_hashtbl)
7931                 goto err_unconf_id;
7932         nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
7933                                               sizeof(struct list_head),
7934                                               GFP_KERNEL);
7935         if (!nn->sessionid_hashtbl)
7936                 goto err_sessionid;
7937
7938         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7939                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7940                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7941         }
7942         for (i = 0; i < SESSION_HASH_SIZE; i++)
7943                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7944         nn->conf_name_tree = RB_ROOT;
7945         nn->unconf_name_tree = RB_ROOT;
7946         nn->boot_time = ktime_get_real_seconds();
7947         nn->grace_ended = false;
7948         nn->nfsd4_manager.block_opens = true;
7949         INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7950         INIT_LIST_HEAD(&nn->client_lru);
7951         INIT_LIST_HEAD(&nn->close_lru);
7952         INIT_LIST_HEAD(&nn->del_recall_lru);
7953         spin_lock_init(&nn->client_lock);
7954         spin_lock_init(&nn->s2s_cp_lock);
7955         idr_init(&nn->s2s_cp_stateids);
7956
7957         spin_lock_init(&nn->blocked_locks_lock);
7958         INIT_LIST_HEAD(&nn->blocked_locks_lru);
7959
7960         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7961         INIT_DELAYED_WORK(&nn->nfsd_shrinker_work, courtesy_client_reaper);
7962         get_net(net);
7963
7964         return 0;
7965
7966 err_sessionid:
7967         kfree(nn->unconf_id_hashtbl);
7968 err_unconf_id:
7969         kfree(nn->conf_id_hashtbl);
7970 err:
7971         return -ENOMEM;
7972 }
7973
7974 static void
7975 nfs4_state_destroy_net(struct net *net)
7976 {
7977         int i;
7978         struct nfs4_client *clp = NULL;
7979         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7980
7981         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7982                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7983                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7984                         destroy_client(clp);
7985                 }
7986         }
7987
7988         WARN_ON(!list_empty(&nn->blocked_locks_lru));
7989
7990         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7991                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7992                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7993                         destroy_client(clp);
7994                 }
7995         }
7996
7997         kfree(nn->sessionid_hashtbl);
7998         kfree(nn->unconf_id_hashtbl);
7999         kfree(nn->conf_id_hashtbl);
8000         put_net(net);
8001 }
8002
8003 int
8004 nfs4_state_start_net(struct net *net)
8005 {
8006         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8007         int ret;
8008
8009         ret = nfs4_state_create_net(net);
8010         if (ret)
8011                 return ret;
8012         locks_start_grace(net, &nn->nfsd4_manager);
8013         nfsd4_client_tracking_init(net);
8014         if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
8015                 goto skip_grace;
8016         printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
8017                nn->nfsd4_grace, net->ns.inum);
8018         trace_nfsd_grace_start(nn);
8019         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
8020         return 0;
8021
8022 skip_grace:
8023         printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
8024                         net->ns.inum);
8025         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
8026         nfsd4_end_grace(nn);
8027         return 0;
8028 }
8029
8030 /* initialization to perform when the nfsd service is started: */
8031
8032 int
8033 nfs4_state_start(void)
8034 {
8035         int ret;
8036
8037         ret = nfsd4_create_callback_queue();
8038         if (ret)
8039                 return ret;
8040
8041         set_max_delegations();
8042         return 0;
8043 }
8044
8045 void
8046 nfs4_state_shutdown_net(struct net *net)
8047 {
8048         struct nfs4_delegation *dp = NULL;
8049         struct list_head *pos, *next, reaplist;
8050         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8051
8052         cancel_delayed_work_sync(&nn->laundromat_work);
8053         locks_end_grace(&nn->nfsd4_manager);
8054
8055         INIT_LIST_HEAD(&reaplist);
8056         spin_lock(&state_lock);
8057         list_for_each_safe(pos, next, &nn->del_recall_lru) {
8058                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8059                 WARN_ON(!unhash_delegation_locked(dp));
8060                 list_add(&dp->dl_recall_lru, &reaplist);
8061         }
8062         spin_unlock(&state_lock);
8063         list_for_each_safe(pos, next, &reaplist) {
8064                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8065                 list_del_init(&dp->dl_recall_lru);
8066                 destroy_unhashed_deleg(dp);
8067         }
8068
8069         nfsd4_client_tracking_exit(net);
8070         nfs4_state_destroy_net(net);
8071 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
8072         nfsd4_ssc_shutdown_umount(nn);
8073 #endif
8074 }
8075
8076 void
8077 nfs4_state_shutdown(void)
8078 {
8079         nfsd4_destroy_callback_queue();
8080 }
8081
8082 static void
8083 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8084 {
8085         if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
8086             CURRENT_STATEID(stateid))
8087                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8088 }
8089
8090 static void
8091 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8092 {
8093         if (cstate->minorversion) {
8094                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
8095                 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8096         }
8097 }
8098
8099 void
8100 clear_current_stateid(struct nfsd4_compound_state *cstate)
8101 {
8102         CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8103 }
8104
8105 /*
8106  * functions to set current state id
8107  */
8108 void
8109 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
8110                 union nfsd4_op_u *u)
8111 {
8112         put_stateid(cstate, &u->open_downgrade.od_stateid);
8113 }
8114
8115 void
8116 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
8117                 union nfsd4_op_u *u)
8118 {
8119         put_stateid(cstate, &u->open.op_stateid);
8120 }
8121
8122 void
8123 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
8124                 union nfsd4_op_u *u)
8125 {
8126         put_stateid(cstate, &u->close.cl_stateid);
8127 }
8128
8129 void
8130 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
8131                 union nfsd4_op_u *u)
8132 {
8133         put_stateid(cstate, &u->lock.lk_resp_stateid);
8134 }
8135
8136 /*
8137  * functions to consume current state id
8138  */
8139
8140 void
8141 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8142                 union nfsd4_op_u *u)
8143 {
8144         get_stateid(cstate, &u->open_downgrade.od_stateid);
8145 }
8146
8147 void
8148 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
8149                 union nfsd4_op_u *u)
8150 {
8151         get_stateid(cstate, &u->delegreturn.dr_stateid);
8152 }
8153
8154 void
8155 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
8156                 union nfsd4_op_u *u)
8157 {
8158         get_stateid(cstate, &u->free_stateid.fr_stateid);
8159 }
8160
8161 void
8162 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
8163                 union nfsd4_op_u *u)
8164 {
8165         get_stateid(cstate, &u->setattr.sa_stateid);
8166 }
8167
8168 void
8169 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
8170                 union nfsd4_op_u *u)
8171 {
8172         get_stateid(cstate, &u->close.cl_stateid);
8173 }
8174
8175 void
8176 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
8177                 union nfsd4_op_u *u)
8178 {
8179         get_stateid(cstate, &u->locku.lu_stateid);
8180 }
8181
8182 void
8183 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
8184                 union nfsd4_op_u *u)
8185 {
8186         get_stateid(cstate, &u->read.rd_stateid);
8187 }
8188
8189 void
8190 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
8191                 union nfsd4_op_u *u)
8192 {
8193         get_stateid(cstate, &u->write.wr_stateid);
8194 }