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