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 "xdr4.h"
  46 #include "xdr4cb.h"
  47 #include "vfs.h"
  48 #include "current_stateid.h"
  49
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  54
  55 #define all_ones {{~0,~0},~0}
  56 static const stateid_t one_stateid = {
  57         .si_generation = ~0,
  58         .si_opaque = all_ones,
  59 };
  60 static const stateid_t zero_stateid = {
  61         /* all fields zero */
  62 };
  63 static const stateid_t currentstateid = {
  64         .si_generation = 1,
  65 };
  66 static const stateid_t close_stateid = {
  67         .si_generation = 0xffffffffU,
  68 };
  69
  70 static u64 current_sessionid = 1;
  71
  72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  73 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  74 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  75 #define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
  76
  77 /* forward declarations */
  78 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
  79 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
  80
  81 /* Locking: */
  82
  83 /*
  84  * Currently used for the del_recall_lru and file hash table.  In an
  85  * effort to decrease the scope of the client_mutex, this spinlock may
  86  * eventually cover more:
  87  */
  88 static DEFINE_SPINLOCK(state_lock);
  89
  90 /*
  91  * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
  92  * the refcount on the open stateid to drop.
  93  */
  94 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
  95
  96 static struct kmem_cache *openowner_slab;
  97 static struct kmem_cache *lockowner_slab;
  98 static struct kmem_cache *file_slab;
  99 static struct kmem_cache *stateid_slab;
 100 static struct kmem_cache *deleg_slab;
 101 static struct kmem_cache *odstate_slab;
 102
 103 static void free_session(struct nfsd4_session *);
 104
 105 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
 106 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
 107
 108 static bool is_session_dead(struct nfsd4_session *ses)
 109 {
 110         return ses->se_flags & NFS4_SESSION_DEAD;
 111 }
 112
 113 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 114 {
 115         if (atomic_read(&ses->se_ref) > ref_held_by_me)
 116                 return nfserr_jukebox;
 117         ses->se_flags |= NFS4_SESSION_DEAD;
 118         return nfs_ok;
 119 }
 120
 121 static bool is_client_expired(struct nfs4_client *clp)
 122 {
 123         return clp->cl_time == 0;
 124 }
 125
 126 static __be32 get_client_locked(struct nfs4_client *clp)
 127 {
 128         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 129
 130         lockdep_assert_held(&nn->client_lock);
 131
 132         if (is_client_expired(clp))
 133                 return nfserr_expired;
 134         atomic_inc(&clp->cl_refcount);
 135         return nfs_ok;
 136 }
 137
 138 /* must be called under the client_lock */
 139 static inline void
 140 renew_client_locked(struct nfs4_client *clp)
 141 {
 142         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 143
 144         if (is_client_expired(clp)) {
 145                 WARN_ON(1);
 146                 printk("%s: client (clientid %08x/%08x) already expired\n",
 147                         __func__,
 148                         clp->cl_clientid.cl_boot,
 149                         clp->cl_clientid.cl_id);
 150                 return;
 151         }
 152
 153         dprintk("renewing client (clientid %08x/%08x)\n",
 154                         clp->cl_clientid.cl_boot,
 155                         clp->cl_clientid.cl_id);
 156         list_move_tail(&clp->cl_lru, &nn->client_lru);
 157         clp->cl_time = get_seconds();
 158 }
 159
 160 static void put_client_renew_locked(struct nfs4_client *clp)
 161 {
 162         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 163
 164         lockdep_assert_held(&nn->client_lock);
 165
 166         if (!atomic_dec_and_test(&clp->cl_refcount))
 167                 return;
 168         if (!is_client_expired(clp))
 169                 renew_client_locked(clp);
 170 }
 171
 172 static void put_client_renew(struct nfs4_client *clp)
 173 {
 174         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 175
 176         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
 177                 return;
 178         if (!is_client_expired(clp))
 179                 renew_client_locked(clp);
 180         spin_unlock(&nn->client_lock);
 181 }
 182
 183 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 184 {
 185         __be32 status;
 186
 187         if (is_session_dead(ses))
 188                 return nfserr_badsession;
 189         status = get_client_locked(ses->se_client);
 190         if (status)
 191                 return status;
 192         atomic_inc(&ses->se_ref);
 193         return nfs_ok;
 194 }
 195
 196 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 197 {
 198         struct nfs4_client *clp = ses->se_client;
 199         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 200
 201         lockdep_assert_held(&nn->client_lock);
 202
 203         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 204                 free_session(ses);
 205         put_client_renew_locked(clp);
 206 }
 207
 208 static void nfsd4_put_session(struct nfsd4_session *ses)
 209 {
 210         struct nfs4_client *clp = ses->se_client;
 211         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 212
 213         spin_lock(&nn->client_lock);
 214         nfsd4_put_session_locked(ses);
 215         spin_unlock(&nn->client_lock);
 216 }
 217
 218 static struct nfsd4_blocked_lock *
 219 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 220                         struct nfsd_net *nn)
 221 {
 222         struct nfsd4_blocked_lock *cur, *found = NULL;
 223
 224         spin_lock(&nn->blocked_locks_lock);
 225         list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
 226                 if (fh_match(fh, &cur->nbl_fh)) {
 227                         list_del_init(&cur->nbl_list);
 228                         list_del_init(&cur->nbl_lru);
 229                         found = cur;
 230                         break;
 231                 }
 232         }
 233         spin_unlock(&nn->blocked_locks_lock);
 234         if (found)
 235                 posix_unblock_lock(&found->nbl_lock);
 236         return found;
 237 }
 238
 239 static struct nfsd4_blocked_lock *
 240 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
 241                         struct nfsd_net *nn)
 242 {
 243         struct nfsd4_blocked_lock *nbl;
 244
 245         nbl = find_blocked_lock(lo, fh, nn);
 246         if (!nbl) {
 247                 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
 248                 if (nbl) {
 249                         INIT_LIST_HEAD(&nbl->nbl_list);
 250                         INIT_LIST_HEAD(&nbl->nbl_lru);
 251                         fh_copy_shallow(&nbl->nbl_fh, fh);
 252                         locks_init_lock(&nbl->nbl_lock);
 253                         nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
 254                                         &nfsd4_cb_notify_lock_ops,
 255                                         NFSPROC4_CLNT_CB_NOTIFY_LOCK);
 256                 }
 257         }
 258         return nbl;
 259 }
 260
 261 static void
 262 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
 263 {
 264         locks_release_private(&nbl->nbl_lock);
 265         kfree(nbl);
 266 }
 267
 268 static void
 269 remove_blocked_locks(struct nfs4_lockowner *lo)
 270 {
 271         struct nfs4_client *clp = lo->lo_owner.so_client;
 272         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 273         struct nfsd4_blocked_lock *nbl;
 274         LIST_HEAD(reaplist);
 275
 276         /* Dequeue all blocked locks */
 277         spin_lock(&nn->blocked_locks_lock);
 278         while (!list_empty(&lo->lo_blocked)) {
 279                 nbl = list_first_entry(&lo->lo_blocked,
 280                                         struct nfsd4_blocked_lock,
 281                                         nbl_list);
 282                 list_del_init(&nbl->nbl_list);
 283                 list_move(&nbl->nbl_lru, &reaplist);
 284         }
 285         spin_unlock(&nn->blocked_locks_lock);
 286
 287         /* Now free them */
 288         while (!list_empty(&reaplist)) {
 289                 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
 290                                         nbl_lru);
 291                 list_del_init(&nbl->nbl_lru);
 292                 posix_unblock_lock(&nbl->nbl_lock);
 293                 free_blocked_lock(nbl);
 294         }
 295 }
 296
 297 static int
 298 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
 299 {
 300         /*
 301          * Since this is just an optimization, we don't try very hard if it
 302          * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
 303          * just quit trying on anything else.
 304          */
 305         switch (task->tk_status) {
 306         case -NFS4ERR_DELAY:
 307                 rpc_delay(task, 1 * HZ);
 308                 return 0;
 309         default:
 310                 return 1;
 311         }
 312 }
 313
 314 static void
 315 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
 316 {
 317         struct nfsd4_blocked_lock       *nbl = container_of(cb,
 318                                                 struct nfsd4_blocked_lock, nbl_cb);
 319
 320         free_blocked_lock(nbl);
 321 }
 322
 323 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
 324         .done           = nfsd4_cb_notify_lock_done,
 325         .release        = nfsd4_cb_notify_lock_release,
 326 };
 327
 328 static inline struct nfs4_stateowner *
 329 nfs4_get_stateowner(struct nfs4_stateowner *sop)
 330 {
 331         atomic_inc(&sop->so_count);
 332         return sop;
 333 }
 334
 335 static int
 336 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
 337 {
 338         return (sop->so_owner.len == owner->len) &&
 339                 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
 340 }
 341
 342 static struct nfs4_openowner *
 343 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
 344                         struct nfs4_client *clp)
 345 {
 346         struct nfs4_stateowner *so;
 347
 348         lockdep_assert_held(&clp->cl_lock);
 349
 350         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
 351                             so_strhash) {
 352                 if (!so->so_is_open_owner)
 353                         continue;
 354                 if (same_owner_str(so, &open->op_owner))
 355                         return openowner(nfs4_get_stateowner(so));
 356         }
 357         return NULL;
 358 }
 359
 360 static struct nfs4_openowner *
 361 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
 362                         struct nfs4_client *clp)
 363 {
 364         struct nfs4_openowner *oo;
 365
 366         spin_lock(&clp->cl_lock);
 367         oo = find_openstateowner_str_locked(hashval, open, clp);
 368         spin_unlock(&clp->cl_lock);
 369         return oo;
 370 }
 371
 372 static inline u32
 373 opaque_hashval(const void *ptr, int nbytes)
 374 {
 375         unsigned char *cptr = (unsigned char *) ptr;
 376
 377         u32 x = 0;
 378         while (nbytes--) {
 379                 x *= 37;
 380                 x += *cptr++;
 381         }
 382         return x;
 383 }
 384
 385 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
 386 {
 387         struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
 388
 389         kmem_cache_free(file_slab, fp);
 390 }
 391
 392 void
 393 put_nfs4_file(struct nfs4_file *fi)
 394 {
 395         might_lock(&state_lock);
 396
 397         if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
 398                 hlist_del_rcu(&fi->fi_hash);
 399                 spin_unlock(&state_lock);
 400                 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
 401                 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
 402                 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
 403         }
 404 }
 405
 406 static struct file *
 407 __nfs4_get_fd(struct nfs4_file *f, int oflag)
 408 {
 409         if (f->fi_fds[oflag])
 410                 return get_file(f->fi_fds[oflag]);
 411         return NULL;
 412 }
 413
 414 static struct file *
 415 find_writeable_file_locked(struct nfs4_file *f)
 416 {
 417         struct file *ret;
 418
 419         lockdep_assert_held(&f->fi_lock);
 420
 421         ret = __nfs4_get_fd(f, O_WRONLY);
 422         if (!ret)
 423                 ret = __nfs4_get_fd(f, O_RDWR);
 424         return ret;
 425 }
 426
 427 static struct file *
 428 find_writeable_file(struct nfs4_file *f)
 429 {
 430         struct file *ret;
 431
 432         spin_lock(&f->fi_lock);
 433         ret = find_writeable_file_locked(f);
 434         spin_unlock(&f->fi_lock);
 435
 436         return ret;
 437 }
 438
 439 static struct file *find_readable_file_locked(struct nfs4_file *f)
 440 {
 441         struct file *ret;
 442
 443         lockdep_assert_held(&f->fi_lock);
 444
 445         ret = __nfs4_get_fd(f, O_RDONLY);
 446         if (!ret)
 447                 ret = __nfs4_get_fd(f, O_RDWR);
 448         return ret;
 449 }
 450
 451 static struct file *
 452 find_readable_file(struct nfs4_file *f)
 453 {
 454         struct file *ret;
 455
 456         spin_lock(&f->fi_lock);
 457         ret = find_readable_file_locked(f);
 458         spin_unlock(&f->fi_lock);
 459
 460         return ret;
 461 }
 462
 463 struct file *
 464 find_any_file(struct nfs4_file *f)
 465 {
 466         struct file *ret;
 467
 468         spin_lock(&f->fi_lock);
 469         ret = __nfs4_get_fd(f, O_RDWR);
 470         if (!ret) {
 471                 ret = __nfs4_get_fd(f, O_WRONLY);
 472                 if (!ret)
 473                         ret = __nfs4_get_fd(f, O_RDONLY);
 474         }
 475         spin_unlock(&f->fi_lock);
 476         return ret;
 477 }
 478
 479 static atomic_long_t num_delegations;
 480 unsigned long max_delegations;
 481
 482 /*
 483  * Open owner state (share locks)
 484  */
 485
 486 /* hash tables for lock and open owners */
 487 #define OWNER_HASH_BITS              8
 488 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 489 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 490
 491 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
 492 {
 493         unsigned int ret;
 494
 495         ret = opaque_hashval(ownername->data, ownername->len);
 496         return ret & OWNER_HASH_MASK;
 497 }
 498
 499 /* hash table for nfs4_file */
 500 #define FILE_HASH_BITS                   8
 501 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 502
 503 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
 504 {
 505         return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
 506 }
 507
 508 static unsigned int file_hashval(struct knfsd_fh *fh)
 509 {
 510         return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
 511 }
 512
 513 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 514
 515 static void
 516 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 517 {
 518         lockdep_assert_held(&fp->fi_lock);
 519
 520         if (access & NFS4_SHARE_ACCESS_WRITE)
 521                 atomic_inc(&fp->fi_access[O_WRONLY]);
 522         if (access & NFS4_SHARE_ACCESS_READ)
 523                 atomic_inc(&fp->fi_access[O_RDONLY]);
 524 }
 525
 526 static __be32
 527 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 528 {
 529         lockdep_assert_held(&fp->fi_lock);
 530
 531         /* Does this access mode make sense? */
 532         if (access & ~NFS4_SHARE_ACCESS_BOTH)
 533                 return nfserr_inval;
 534
 535         /* Does it conflict with a deny mode already set? */
 536         if ((access & fp->fi_share_deny) != 0)
 537                 return nfserr_share_denied;
 538
 539         __nfs4_file_get_access(fp, access);
 540         return nfs_ok;
 541 }
 542
 543 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
 544 {
 545         /* Common case is that there is no deny mode. */
 546         if (deny) {
 547                 /* Does this deny mode make sense? */
 548                 if (deny & ~NFS4_SHARE_DENY_BOTH)
 549                         return nfserr_inval;
 550
 551                 if ((deny & NFS4_SHARE_DENY_READ) &&
 552                     atomic_read(&fp->fi_access[O_RDONLY]))
 553                         return nfserr_share_denied;
 554
 555                 if ((deny & NFS4_SHARE_DENY_WRITE) &&
 556                     atomic_read(&fp->fi_access[O_WRONLY]))
 557                         return nfserr_share_denied;
 558         }
 559         return nfs_ok;
 560 }
 561
 562 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 563 {
 564         might_lock(&fp->fi_lock);
 565
 566         if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
 567                 struct file *f1 = NULL;
 568                 struct file *f2 = NULL;
 569
 570                 swap(f1, fp->fi_fds[oflag]);
 571                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 572                         swap(f2, fp->fi_fds[O_RDWR]);
 573                 spin_unlock(&fp->fi_lock);
 574                 if (f1)
 575                         fput(f1);
 576                 if (f2)
 577                         fput(f2);
 578         }
 579 }
 580
 581 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
 582 {
 583         WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
 584
 585         if (access & NFS4_SHARE_ACCESS_WRITE)
 586                 __nfs4_file_put_access(fp, O_WRONLY);
 587         if (access & NFS4_SHARE_ACCESS_READ)
 588                 __nfs4_file_put_access(fp, O_RDONLY);
 589 }
 590
 591 /*
 592  * Allocate a new open/delegation state counter. This is needed for
 593  * pNFS for proper return on close semantics.
 594  *
 595  * Note that we only allocate it for pNFS-enabled exports, otherwise
 596  * all pointers to struct nfs4_clnt_odstate are always NULL.
 597  */
 598 static struct nfs4_clnt_odstate *
 599 alloc_clnt_odstate(struct nfs4_client *clp)
 600 {
 601         struct nfs4_clnt_odstate *co;
 602
 603         co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
 604         if (co) {
 605                 co->co_client = clp;
 606                 atomic_set(&co->co_odcount, 1);
 607         }
 608         return co;
 609 }
 610
 611 static void
 612 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
 613 {
 614         struct nfs4_file *fp = co->co_file;
 615
 616         lockdep_assert_held(&fp->fi_lock);
 617         list_add(&co->co_perfile, &fp->fi_clnt_odstate);
 618 }
 619
 620 static inline void
 621 get_clnt_odstate(struct nfs4_clnt_odstate *co)
 622 {
 623         if (co)
 624                 atomic_inc(&co->co_odcount);
 625 }
 626
 627 static void
 628 put_clnt_odstate(struct nfs4_clnt_odstate *co)
 629 {
 630         struct nfs4_file *fp;
 631
 632         if (!co)
 633                 return;
 634
 635         fp = co->co_file;
 636         if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
 637                 list_del(&co->co_perfile);
 638                 spin_unlock(&fp->fi_lock);
 639
 640                 nfsd4_return_all_file_layouts(co->co_client, fp);
 641                 kmem_cache_free(odstate_slab, co);
 642         }
 643 }
 644
 645 static struct nfs4_clnt_odstate *
 646 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
 647 {
 648         struct nfs4_clnt_odstate *co;
 649         struct nfs4_client *cl;
 650
 651         if (!new)
 652                 return NULL;
 653
 654         cl = new->co_client;
 655
 656         spin_lock(&fp->fi_lock);
 657         list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
 658                 if (co->co_client == cl) {
 659                         get_clnt_odstate(co);
 660                         goto out;
 661                 }
 662         }
 663         co = new;
 664         co->co_file = fp;
 665         hash_clnt_odstate_locked(new);
 666 out:
 667         spin_unlock(&fp->fi_lock);
 668         return co;
 669 }
 670
 671 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
 672                                   void (*sc_free)(struct nfs4_stid *))
 673 {
 674         struct nfs4_stid *stid;
 675         int new_id;
 676
 677         stid = kmem_cache_zalloc(slab, GFP_KERNEL);
 678         if (!stid)
 679                 return NULL;
 680
 681         idr_preload(GFP_KERNEL);
 682         spin_lock(&cl->cl_lock);
 683         new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
 684         spin_unlock(&cl->cl_lock);
 685         idr_preload_end();
 686         if (new_id < 0)
 687                 goto out_free;
 688
 689         stid->sc_free = sc_free;
 690         stid->sc_client = cl;
 691         stid->sc_stateid.si_opaque.so_id = new_id;
 692         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 693         /* Will be incremented before return to client: */
 694         atomic_set(&stid->sc_count, 1);
 695         spin_lock_init(&stid->sc_lock);
 696
 697         /*
 698          * It shouldn't be a problem to reuse an opaque stateid value.
 699          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 700          * example, a stray write retransmission could be accepted by
 701          * the server when it should have been rejected.  Therefore,
 702          * adopt a trick from the sctp code to attempt to maximize the
 703          * amount of time until an id is reused, by ensuring they always
 704          * "increase" (mod INT_MAX):
 705          */
 706         return stid;
 707 out_free:
 708         kmem_cache_free(slab, stid);
 709         return NULL;
 710 }
 711
 712 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
 713 {
 714         struct nfs4_stid *stid;
 715
 716         stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
 717         if (!stid)
 718                 return NULL;
 719
 720         return openlockstateid(stid);
 721 }
 722
 723 static void nfs4_free_deleg(struct nfs4_stid *stid)
 724 {
 725         kmem_cache_free(deleg_slab, stid);
 726         atomic_long_dec(&num_delegations);
 727 }
 728
 729 /*
 730  * When we recall a delegation, we should be careful not to hand it
 731  * out again straight away.
 732  * To ensure this we keep a pair of bloom filters ('new' and 'old')
 733  * in which the filehandles of recalled delegations are "stored".
 734  * If a filehandle appear in either filter, a delegation is blocked.
 735  * When a delegation is recalled, the filehandle is stored in the "new"
 736  * filter.
 737  * Every 30 seconds we swap the filters and clear the "new" one,
 738  * unless both are empty of course.
 739  *
 740  * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
 741  * low 3 bytes as hash-table indices.
 742  *
 743  * 'blocked_delegations_lock', which is always taken in block_delegations(),
 744  * is used to manage concurrent access.  Testing does not need the lock
 745  * except when swapping the two filters.
 746  */
 747 static DEFINE_SPINLOCK(blocked_delegations_lock);
 748 static struct bloom_pair {
 749         int     entries, old_entries;
 750         time_t  swap_time;
 751         int     new; /* index into 'set' */
 752         DECLARE_BITMAP(set[2], 256);
 753 } blocked_delegations;
 754
 755 static int delegation_blocked(struct knfsd_fh *fh)
 756 {
 757         u32 hash;
 758         struct bloom_pair *bd = &blocked_delegations;
 759
 760         if (bd->entries == 0)
 761                 return 0;
 762         if (seconds_since_boot() - bd->swap_time > 30) {
 763                 spin_lock(&blocked_delegations_lock);
 764                 if (seconds_since_boot() - bd->swap_time > 30) {
 765                         bd->entries -= bd->old_entries;
 766                         bd->old_entries = bd->entries;
 767                         memset(bd->set[bd->new], 0,
 768                                sizeof(bd->set[0]));
 769                         bd->new = 1-bd->new;
 770                         bd->swap_time = seconds_since_boot();
 771                 }
 772                 spin_unlock(&blocked_delegations_lock);
 773         }
 774         hash = jhash(&fh->fh_base, fh->fh_size, 0);
 775         if (test_bit(hash&255, bd->set[0]) &&
 776             test_bit((hash>>8)&255, bd->set[0]) &&
 777             test_bit((hash>>16)&255, bd->set[0]))
 778                 return 1;
 779
 780         if (test_bit(hash&255, bd->set[1]) &&
 781             test_bit((hash>>8)&255, bd->set[1]) &&
 782             test_bit((hash>>16)&255, bd->set[1]))
 783                 return 1;
 784
 785         return 0;
 786 }
 787
 788 static void block_delegations(struct knfsd_fh *fh)
 789 {
 790         u32 hash;
 791         struct bloom_pair *bd = &blocked_delegations;
 792
 793         hash = jhash(&fh->fh_base, fh->fh_size, 0);
 794
 795         spin_lock(&blocked_delegations_lock);
 796         __set_bit(hash&255, bd->set[bd->new]);
 797         __set_bit((hash>>8)&255, bd->set[bd->new]);
 798         __set_bit((hash>>16)&255, bd->set[bd->new]);
 799         if (bd->entries == 0)
 800                 bd->swap_time = seconds_since_boot();
 801         bd->entries += 1;
 802         spin_unlock(&blocked_delegations_lock);
 803 }
 804
 805 static struct nfs4_delegation *
 806 alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh,
 807                  struct nfs4_clnt_odstate *odstate)
 808 {
 809         struct nfs4_delegation *dp;
 810         long n;
 811
 812         dprintk("NFSD alloc_init_deleg\n");
 813         n = atomic_long_inc_return(&num_delegations);
 814         if (n < 0 || n > max_delegations)
 815                 goto out_dec;
 816         if (delegation_blocked(&current_fh->fh_handle))
 817                 goto out_dec;
 818         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
 819         if (dp == NULL)
 820                 goto out_dec;
 821
 822         /*
 823          * delegation seqid's are never incremented.  The 4.1 special
 824          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 825          * 0 anyway just for consistency and use 1:
 826          */
 827         dp->dl_stid.sc_stateid.si_generation = 1;
 828         INIT_LIST_HEAD(&dp->dl_perfile);
 829         INIT_LIST_HEAD(&dp->dl_perclnt);
 830         INIT_LIST_HEAD(&dp->dl_recall_lru);
 831         dp->dl_clnt_odstate = odstate;
 832         get_clnt_odstate(odstate);
 833         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
 834         dp->dl_retries = 1;
 835         nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
 836                       &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
 837         return dp;
 838 out_dec:
 839         atomic_long_dec(&num_delegations);
 840         return NULL;
 841 }
 842
 843 void
 844 nfs4_put_stid(struct nfs4_stid *s)
 845 {
 846         struct nfs4_file *fp = s->sc_file;
 847         struct nfs4_client *clp = s->sc_client;
 848
 849         might_lock(&clp->cl_lock);
 850
 851         if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
 852                 wake_up_all(&close_wq);
 853                 return;
 854         }
 855         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
 856         spin_unlock(&clp->cl_lock);
 857         s->sc_free(s);
 858         if (fp)
 859                 put_nfs4_file(fp);
 860 }
 861
 862 void
 863 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
 864 {
 865         stateid_t *src = &stid->sc_stateid;
 866
 867         spin_lock(&stid->sc_lock);
 868         if (unlikely(++src->si_generation == 0))
 869                 src->si_generation = 1;
 870         memcpy(dst, src, sizeof(*dst));
 871         spin_unlock(&stid->sc_lock);
 872 }
 873
 874 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 875 {
 876         struct file *filp = NULL;
 877
 878         spin_lock(&fp->fi_lock);
 879         if (fp->fi_deleg_file && --fp->fi_delegees == 0)
 880                 swap(filp, fp->fi_deleg_file);
 881         spin_unlock(&fp->fi_lock);
 882
 883         if (filp) {
 884                 vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
 885                 fput(filp);
 886         }
 887 }
 888
 889 void nfs4_unhash_stid(struct nfs4_stid *s)
 890 {
 891         s->sc_type = 0;
 892 }
 893
 894 /**
 895  * nfs4_get_existing_delegation - Discover if this delegation already exists
 896  * @clp:     a pointer to the nfs4_client we're granting a delegation to
 897  * @fp:      a pointer to the nfs4_file we're granting a delegation on
 898  *
 899  * Return:
 900  *      On success: NULL if an existing delegation was not found.
 901  *
 902  *      On error: -EAGAIN if one was previously granted to this nfs4_client
 903  *                 for this nfs4_file.
 904  *
 905  */
 906
 907 static int
 908 nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
 909 {
 910         struct nfs4_delegation *searchdp = NULL;
 911         struct nfs4_client *searchclp = NULL;
 912
 913         lockdep_assert_held(&state_lock);
 914         lockdep_assert_held(&fp->fi_lock);
 915
 916         list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
 917                 searchclp = searchdp->dl_stid.sc_client;
 918                 if (clp == searchclp) {
 919                         return -EAGAIN;
 920                 }
 921         }
 922         return 0;
 923 }
 924
 925 /**
 926  * hash_delegation_locked - Add a delegation to the appropriate lists
 927  * @dp:     a pointer to the nfs4_delegation we are adding.
 928  * @fp:     a pointer to the nfs4_file we're granting a delegation on
 929  *
 930  * Return:
 931  *      On success: NULL if the delegation was successfully hashed.
 932  *
 933  *      On error: -EAGAIN if one was previously granted to this
 934  *                 nfs4_client for this nfs4_file. Delegation is not hashed.
 935  *
 936  */
 937
 938 static int
 939 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 940 {
 941         int status;
 942         struct nfs4_client *clp = dp->dl_stid.sc_client;
 943
 944         lockdep_assert_held(&state_lock);
 945         lockdep_assert_held(&fp->fi_lock);
 946
 947         status = nfs4_get_existing_delegation(clp, fp);
 948         if (status)
 949                 return status;
 950         ++fp->fi_delegees;
 951         atomic_inc(&dp->dl_stid.sc_count);
 952         dp->dl_stid.sc_type = NFS4_DELEG_STID;
 953         list_add(&dp->dl_perfile, &fp->fi_delegations);
 954         list_add(&dp->dl_perclnt, &clp->cl_delegations);
 955         return 0;
 956 }
 957
 958 static bool delegation_hashed(struct nfs4_delegation *dp)
 959 {
 960         return !(list_empty(&dp->dl_perfile));
 961 }
 962
 963 static bool
 964 unhash_delegation_locked(struct nfs4_delegation *dp)
 965 {
 966         struct nfs4_file *fp = dp->dl_stid.sc_file;
 967
 968         lockdep_assert_held(&state_lock);
 969
 970         if (!delegation_hashed(dp))
 971                 return false;
 972
 973         dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
 974         /* Ensure that deleg break won't try to requeue it */
 975         ++dp->dl_time;
 976         spin_lock(&fp->fi_lock);
 977         list_del_init(&dp->dl_perclnt);
 978         list_del_init(&dp->dl_recall_lru);
 979         list_del_init(&dp->dl_perfile);
 980         spin_unlock(&fp->fi_lock);
 981         return true;
 982 }
 983
 984 static void destroy_delegation(struct nfs4_delegation *dp)
 985 {
 986         bool unhashed;
 987
 988         spin_lock(&state_lock);
 989         unhashed = unhash_delegation_locked(dp);
 990         spin_unlock(&state_lock);
 991         if (unhashed) {
 992                 put_clnt_odstate(dp->dl_clnt_odstate);
 993                 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
 994                 nfs4_put_stid(&dp->dl_stid);
 995         }
 996 }
 997
 998 static void revoke_delegation(struct nfs4_delegation *dp)
 999 {
1000         struct nfs4_client *clp = dp->dl_stid.sc_client;
1001
1002         WARN_ON(!list_empty(&dp->dl_recall_lru));
1003
1004         put_clnt_odstate(dp->dl_clnt_odstate);
1005         nfs4_put_deleg_lease(dp->dl_stid.sc_file);
1006
1007         if (clp->cl_minorversion == 0)
1008                 nfs4_put_stid(&dp->dl_stid);
1009         else {
1010                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1011                 spin_lock(&clp->cl_lock);
1012                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1013                 spin_unlock(&clp->cl_lock);
1014         }
1015 }
1016
1017 /*
1018  * SETCLIENTID state
1019  */
1020
1021 static unsigned int clientid_hashval(u32 id)
1022 {
1023         return id & CLIENT_HASH_MASK;
1024 }
1025
1026 static unsigned int clientstr_hashval(const char *name)
1027 {
1028         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
1029 }
1030
1031 /*
1032  * We store the NONE, READ, WRITE, and BOTH bits separately in the
1033  * st_{access,deny}_bmap field of the stateid, in order to track not
1034  * only what share bits are currently in force, but also what
1035  * combinations of share bits previous opens have used.  This allows us
1036  * to enforce the recommendation of rfc 3530 14.2.19 that the server
1037  * return an error if the client attempt to downgrade to a combination
1038  * of share bits not explicable by closing some of its previous opens.
1039  *
1040  * XXX: This enforcement is actually incomplete, since we don't keep
1041  * track of access/deny bit combinations; so, e.g., we allow:
1042  *
1043  *      OPEN allow read, deny write
1044  *      OPEN allow both, deny none
1045  *      DOWNGRADE allow read, deny none
1046  *
1047  * which we should reject.
1048  */
1049 static unsigned int
1050 bmap_to_share_mode(unsigned long bmap) {
1051         int i;
1052         unsigned int access = 0;
1053
1054         for (i = 1; i < 4; i++) {
1055                 if (test_bit(i, &bmap))
1056                         access |= i;
1057         }
1058         return access;
1059 }
1060
1061 /* set share access for a given stateid */
1062 static inline void
1063 set_access(u32 access, struct nfs4_ol_stateid *stp)
1064 {
1065         unsigned char mask = 1 << access;
1066
1067         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1068         stp->st_access_bmap |= mask;
1069 }
1070
1071 /* clear share access for a given stateid */
1072 static inline void
1073 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1074 {
1075         unsigned char mask = 1 << access;
1076
1077         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1078         stp->st_access_bmap &= ~mask;
1079 }
1080
1081 /* test whether a given stateid has access */
1082 static inline bool
1083 test_access(u32 access, struct nfs4_ol_stateid *stp)
1084 {
1085         unsigned char mask = 1 << access;
1086
1087         return (bool)(stp->st_access_bmap & mask);
1088 }
1089
1090 /* set share deny for a given stateid */
1091 static inline void
1092 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1093 {
1094         unsigned char mask = 1 << deny;
1095
1096         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1097         stp->st_deny_bmap |= mask;
1098 }
1099
1100 /* clear share deny for a given stateid */
1101 static inline void
1102 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1103 {
1104         unsigned char mask = 1 << deny;
1105
1106         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1107         stp->st_deny_bmap &= ~mask;
1108 }
1109
1110 /* test whether a given stateid is denying specific access */
1111 static inline bool
1112 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1113 {
1114         unsigned char mask = 1 << deny;
1115
1116         return (bool)(stp->st_deny_bmap & mask);
1117 }
1118
1119 static int nfs4_access_to_omode(u32 access)
1120 {
1121         switch (access & NFS4_SHARE_ACCESS_BOTH) {
1122         case NFS4_SHARE_ACCESS_READ:
1123                 return O_RDONLY;
1124         case NFS4_SHARE_ACCESS_WRITE:
1125                 return O_WRONLY;
1126         case NFS4_SHARE_ACCESS_BOTH:
1127                 return O_RDWR;
1128         }
1129         WARN_ON_ONCE(1);
1130         return O_RDONLY;
1131 }
1132
1133 /*
1134  * A stateid that had a deny mode associated with it is being released
1135  * or downgraded. Recalculate the deny mode on the file.
1136  */
1137 static void
1138 recalculate_deny_mode(struct nfs4_file *fp)
1139 {
1140         struct nfs4_ol_stateid *stp;
1141
1142         spin_lock(&fp->fi_lock);
1143         fp->fi_share_deny = 0;
1144         list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1145                 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1146         spin_unlock(&fp->fi_lock);
1147 }
1148
1149 static void
1150 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1151 {
1152         int i;
1153         bool change = false;
1154
1155         for (i = 1; i < 4; i++) {
1156                 if ((i & deny) != i) {
1157                         change = true;
1158                         clear_deny(i, stp);
1159                 }
1160         }
1161
1162         /* Recalculate per-file deny mode if there was a change */
1163         if (change)
1164                 recalculate_deny_mode(stp->st_stid.sc_file);
1165 }
1166
1167 /* release all access and file references for a given stateid */
1168 static void
1169 release_all_access(struct nfs4_ol_stateid *stp)
1170 {
1171         int i;
1172         struct nfs4_file *fp = stp->st_stid.sc_file;
1173
1174         if (fp && stp->st_deny_bmap != 0)
1175                 recalculate_deny_mode(fp);
1176
1177         for (i = 1; i < 4; i++) {
1178                 if (test_access(i, stp))
1179                         nfs4_file_put_access(stp->st_stid.sc_file, i);
1180                 clear_access(i, stp);
1181         }
1182 }
1183
1184 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1185 {
1186         kfree(sop->so_owner.data);
1187         sop->so_ops->so_free(sop);
1188 }
1189
1190 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1191 {
1192         struct nfs4_client *clp = sop->so_client;
1193
1194         might_lock(&clp->cl_lock);
1195
1196         if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1197                 return;
1198         sop->so_ops->so_unhash(sop);
1199         spin_unlock(&clp->cl_lock);
1200         nfs4_free_stateowner(sop);
1201 }
1202
1203 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1204 {
1205         struct nfs4_file *fp = stp->st_stid.sc_file;
1206
1207         lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1208
1209         if (list_empty(&stp->st_perfile))
1210                 return false;
1211
1212         spin_lock(&fp->fi_lock);
1213         list_del_init(&stp->st_perfile);
1214         spin_unlock(&fp->fi_lock);
1215         list_del(&stp->st_perstateowner);
1216         return true;
1217 }
1218
1219 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1220 {
1221         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1222
1223         put_clnt_odstate(stp->st_clnt_odstate);
1224         release_all_access(stp);
1225         if (stp->st_stateowner)
1226                 nfs4_put_stateowner(stp->st_stateowner);
1227         kmem_cache_free(stateid_slab, stid);
1228 }
1229
1230 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1231 {
1232         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1233         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1234         struct file *file;
1235
1236         file = find_any_file(stp->st_stid.sc_file);
1237         if (file)
1238                 filp_close(file, (fl_owner_t)lo);
1239         nfs4_free_ol_stateid(stid);
1240 }
1241
1242 /*
1243  * Put the persistent reference to an already unhashed generic stateid, while
1244  * holding the cl_lock. If it's the last reference, then put it onto the
1245  * reaplist for later destruction.
1246  */
1247 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1248                                        struct list_head *reaplist)
1249 {
1250         struct nfs4_stid *s = &stp->st_stid;
1251         struct nfs4_client *clp = s->sc_client;
1252
1253         lockdep_assert_held(&clp->cl_lock);
1254
1255         WARN_ON_ONCE(!list_empty(&stp->st_locks));
1256
1257         if (!atomic_dec_and_test(&s->sc_count)) {
1258                 wake_up_all(&close_wq);
1259                 return;
1260         }
1261
1262         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1263         list_add(&stp->st_locks, reaplist);
1264 }
1265
1266 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1267 {
1268         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1269
1270         list_del_init(&stp->st_locks);
1271         nfs4_unhash_stid(&stp->st_stid);
1272         return unhash_ol_stateid(stp);
1273 }
1274
1275 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1276 {
1277         struct nfs4_client *clp = stp->st_stid.sc_client;
1278         bool unhashed;
1279
1280         spin_lock(&clp->cl_lock);
1281         unhashed = unhash_lock_stateid(stp);
1282         spin_unlock(&clp->cl_lock);
1283         if (unhashed)
1284                 nfs4_put_stid(&stp->st_stid);
1285 }
1286
1287 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1288 {
1289         struct nfs4_client *clp = lo->lo_owner.so_client;
1290
1291         lockdep_assert_held(&clp->cl_lock);
1292
1293         list_del_init(&lo->lo_owner.so_strhash);
1294 }
1295
1296 /*
1297  * Free a list of generic stateids that were collected earlier after being
1298  * fully unhashed.
1299  */
1300 static void
1301 free_ol_stateid_reaplist(struct list_head *reaplist)
1302 {
1303         struct nfs4_ol_stateid *stp;
1304         struct nfs4_file *fp;
1305
1306         might_sleep();
1307
1308         while (!list_empty(reaplist)) {
1309                 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1310                                        st_locks);
1311                 list_del(&stp->st_locks);
1312                 fp = stp->st_stid.sc_file;
1313                 stp->st_stid.sc_free(&stp->st_stid);
1314                 if (fp)
1315                         put_nfs4_file(fp);
1316         }
1317 }
1318
1319 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1320                                        struct list_head *reaplist)
1321 {
1322         struct nfs4_ol_stateid *stp;
1323
1324         lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1325
1326         while (!list_empty(&open_stp->st_locks)) {
1327                 stp = list_entry(open_stp->st_locks.next,
1328                                 struct nfs4_ol_stateid, st_locks);
1329                 WARN_ON(!unhash_lock_stateid(stp));
1330                 put_ol_stateid_locked(stp, reaplist);
1331         }
1332 }
1333
1334 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1335                                 struct list_head *reaplist)
1336 {
1337         bool unhashed;
1338
1339         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1340
1341         unhashed = unhash_ol_stateid(stp);
1342         release_open_stateid_locks(stp, reaplist);
1343         return unhashed;
1344 }
1345
1346 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1347 {
1348         LIST_HEAD(reaplist);
1349
1350         spin_lock(&stp->st_stid.sc_client->cl_lock);
1351         if (unhash_open_stateid(stp, &reaplist))
1352                 put_ol_stateid_locked(stp, &reaplist);
1353         spin_unlock(&stp->st_stid.sc_client->cl_lock);
1354         free_ol_stateid_reaplist(&reaplist);
1355 }
1356
1357 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1358 {
1359         struct nfs4_client *clp = oo->oo_owner.so_client;
1360
1361         lockdep_assert_held(&clp->cl_lock);
1362
1363         list_del_init(&oo->oo_owner.so_strhash);
1364         list_del_init(&oo->oo_perclient);
1365 }
1366
1367 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1368 {
1369         struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1370                                           nfsd_net_id);
1371         struct nfs4_ol_stateid *s;
1372
1373         spin_lock(&nn->client_lock);
1374         s = oo->oo_last_closed_stid;
1375         if (s) {
1376                 list_del_init(&oo->oo_close_lru);
1377                 oo->oo_last_closed_stid = NULL;
1378         }
1379         spin_unlock(&nn->client_lock);
1380         if (s)
1381                 nfs4_put_stid(&s->st_stid);
1382 }
1383
1384 static void release_openowner(struct nfs4_openowner *oo)
1385 {
1386         struct nfs4_ol_stateid *stp;
1387         struct nfs4_client *clp = oo->oo_owner.so_client;
1388         struct list_head reaplist;
1389
1390         INIT_LIST_HEAD(&reaplist);
1391
1392         spin_lock(&clp->cl_lock);
1393         unhash_openowner_locked(oo);
1394         while (!list_empty(&oo->oo_owner.so_stateids)) {
1395                 stp = list_first_entry(&oo->oo_owner.so_stateids,
1396                                 struct nfs4_ol_stateid, st_perstateowner);
1397                 if (unhash_open_stateid(stp, &reaplist))
1398                         put_ol_stateid_locked(stp, &reaplist);
1399         }
1400         spin_unlock(&clp->cl_lock);
1401         free_ol_stateid_reaplist(&reaplist);
1402         release_last_closed_stateid(oo);
1403         nfs4_put_stateowner(&oo->oo_owner);
1404 }
1405
1406 static inline int
1407 hash_sessionid(struct nfs4_sessionid *sessionid)
1408 {
1409         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1410
1411         return sid->sequence % SESSION_HASH_SIZE;
1412 }
1413
1414 #ifdef CONFIG_SUNRPC_DEBUG
1415 static inline void
1416 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1417 {
1418         u32 *ptr = (u32 *)(&sessionid->data[0]);
1419         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1420 }
1421 #else
1422 static inline void
1423 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1424 {
1425 }
1426 #endif
1427
1428 /*
1429  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1430  * won't be used for replay.
1431  */
1432 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1433 {
1434         struct nfs4_stateowner *so = cstate->replay_owner;
1435
1436         if (nfserr == nfserr_replay_me)
1437                 return;
1438
1439         if (!seqid_mutating_err(ntohl(nfserr))) {
1440                 nfsd4_cstate_clear_replay(cstate);
1441                 return;
1442         }
1443         if (!so)
1444                 return;
1445         if (so->so_is_open_owner)
1446                 release_last_closed_stateid(openowner(so));
1447         so->so_seqid++;
1448         return;
1449 }
1450
1451 static void
1452 gen_sessionid(struct nfsd4_session *ses)
1453 {
1454         struct nfs4_client *clp = ses->se_client;
1455         struct nfsd4_sessionid *sid;
1456
1457         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1458         sid->clientid = clp->cl_clientid;
1459         sid->sequence = current_sessionid++;
1460         sid->reserved = 0;
1461 }
1462
1463 /*
1464  * The protocol defines ca_maxresponssize_cached to include the size of
1465  * the rpc header, but all we need to cache is the data starting after
1466  * the end of the initial SEQUENCE operation--the rest we regenerate
1467  * each time.  Therefore we can advertise a ca_maxresponssize_cached
1468  * value that is the number of bytes in our cache plus a few additional
1469  * bytes.  In order to stay on the safe side, and not promise more than
1470  * we can cache, those additional bytes must be the minimum possible: 24
1471  * bytes of rpc header (xid through accept state, with AUTH_NULL
1472  * verifier), 12 for the compound header (with zero-length tag), and 44
1473  * for the SEQUENCE op response:
1474  */
1475 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
1476
1477 static void
1478 free_session_slots(struct nfsd4_session *ses)
1479 {
1480         int i;
1481
1482         for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1483                 free_svc_cred(&ses->se_slots[i]->sl_cred);
1484                 kfree(ses->se_slots[i]);
1485         }
1486 }
1487
1488 /*
1489  * We don't actually need to cache the rpc and session headers, so we
1490  * can allocate a little less for each slot:
1491  */
1492 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1493 {
1494         u32 size;
1495
1496         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1497                 size = 0;
1498         else
1499                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1500         return size + sizeof(struct nfsd4_slot);
1501 }
1502
1503 /*
1504  * XXX: If we run out of reserved DRC memory we could (up to a point)
1505  * re-negotiate active sessions and reduce their slot usage to make
1506  * room for new connections. For now we just fail the create session.
1507  */
1508 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1509 {
1510         u32 slotsize = slot_bytes(ca);
1511         u32 num = ca->maxreqs;
1512         unsigned long avail, total_avail;
1513
1514         spin_lock(&nfsd_drc_lock);
1515         total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1516         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1517         /*
1518          * Never use more than a third of the remaining memory,
1519          * unless it's the only way to give this client a slot:
1520          */
1521         avail = clamp_t(unsigned long, avail, slotsize, total_avail/3);
1522         num = min_t(int, num, avail / slotsize);
1523         nfsd_drc_mem_used += num * slotsize;
1524         spin_unlock(&nfsd_drc_lock);
1525
1526         return num;
1527 }
1528
1529 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1530 {
1531         int slotsize = slot_bytes(ca);
1532
1533         spin_lock(&nfsd_drc_lock);
1534         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1535         spin_unlock(&nfsd_drc_lock);
1536 }
1537
1538 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1539                                            struct nfsd4_channel_attrs *battrs)
1540 {
1541         int numslots = fattrs->maxreqs;
1542         int slotsize = slot_bytes(fattrs);
1543         struct nfsd4_session *new;
1544         int mem, i;
1545
1546         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1547                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
1548         mem = numslots * sizeof(struct nfsd4_slot *);
1549
1550         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1551         if (!new)
1552                 return NULL;
1553         /* allocate each struct nfsd4_slot and data cache in one piece */
1554         for (i = 0; i < numslots; i++) {
1555                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1556                 if (!new->se_slots[i])
1557                         goto out_free;
1558         }
1559
1560         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1561         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1562
1563         return new;
1564 out_free:
1565         while (i--)
1566                 kfree(new->se_slots[i]);
1567         kfree(new);
1568         return NULL;
1569 }
1570
1571 static void free_conn(struct nfsd4_conn *c)
1572 {
1573         svc_xprt_put(c->cn_xprt);
1574         kfree(c);
1575 }
1576
1577 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1578 {
1579         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1580         struct nfs4_client *clp = c->cn_session->se_client;
1581
1582         spin_lock(&clp->cl_lock);
1583         if (!list_empty(&c->cn_persession)) {
1584                 list_del(&c->cn_persession);
1585                 free_conn(c);
1586         }
1587         nfsd4_probe_callback(clp);
1588         spin_unlock(&clp->cl_lock);
1589 }
1590
1591 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1592 {
1593         struct nfsd4_conn *conn;
1594
1595         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1596         if (!conn)
1597                 return NULL;
1598         svc_xprt_get(rqstp->rq_xprt);
1599         conn->cn_xprt = rqstp->rq_xprt;
1600         conn->cn_flags = flags;
1601         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1602         return conn;
1603 }
1604
1605 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1606 {
1607         conn->cn_session = ses;
1608         list_add(&conn->cn_persession, &ses->se_conns);
1609 }
1610
1611 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1612 {
1613         struct nfs4_client *clp = ses->se_client;
1614
1615         spin_lock(&clp->cl_lock);
1616         __nfsd4_hash_conn(conn, ses);
1617         spin_unlock(&clp->cl_lock);
1618 }
1619
1620 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1621 {
1622         conn->cn_xpt_user.callback = nfsd4_conn_lost;
1623         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1624 }
1625
1626 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1627 {
1628         int ret;
1629
1630         nfsd4_hash_conn(conn, ses);
1631         ret = nfsd4_register_conn(conn);
1632         if (ret)
1633                 /* oops; xprt is already down: */
1634                 nfsd4_conn_lost(&conn->cn_xpt_user);
1635         /* We may have gained or lost a callback channel: */
1636         nfsd4_probe_callback_sync(ses->se_client);
1637 }
1638
1639 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1640 {
1641         u32 dir = NFS4_CDFC4_FORE;
1642
1643         if (cses->flags & SESSION4_BACK_CHAN)
1644                 dir |= NFS4_CDFC4_BACK;
1645         return alloc_conn(rqstp, dir);
1646 }
1647
1648 /* must be called under client_lock */
1649 static void nfsd4_del_conns(struct nfsd4_session *s)
1650 {
1651         struct nfs4_client *clp = s->se_client;
1652         struct nfsd4_conn *c;
1653
1654         spin_lock(&clp->cl_lock);
1655         while (!list_empty(&s->se_conns)) {
1656                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1657                 list_del_init(&c->cn_persession);
1658                 spin_unlock(&clp->cl_lock);
1659
1660                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1661                 free_conn(c);
1662
1663                 spin_lock(&clp->cl_lock);
1664         }
1665         spin_unlock(&clp->cl_lock);
1666 }
1667
1668 static void __free_session(struct nfsd4_session *ses)
1669 {
1670         free_session_slots(ses);
1671         kfree(ses);
1672 }
1673
1674 static void free_session(struct nfsd4_session *ses)
1675 {
1676         nfsd4_del_conns(ses);
1677         nfsd4_put_drc_mem(&ses->se_fchannel);
1678         __free_session(ses);
1679 }
1680
1681 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1682 {
1683         int idx;
1684         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1685
1686         new->se_client = clp;
1687         gen_sessionid(new);
1688
1689         INIT_LIST_HEAD(&new->se_conns);
1690
1691         new->se_cb_seq_nr = 1;
1692         new->se_flags = cses->flags;
1693         new->se_cb_prog = cses->callback_prog;
1694         new->se_cb_sec = cses->cb_sec;
1695         atomic_set(&new->se_ref, 0);
1696         idx = hash_sessionid(&new->se_sessionid);
1697         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1698         spin_lock(&clp->cl_lock);
1699         list_add(&new->se_perclnt, &clp->cl_sessions);
1700         spin_unlock(&clp->cl_lock);
1701
1702         {
1703                 struct sockaddr *sa = svc_addr(rqstp);
1704                 /*
1705                  * This is a little silly; with sessions there's no real
1706                  * use for the callback address.  Use the peer address
1707                  * as a reasonable default for now, but consider fixing
1708                  * the rpc client not to require an address in the
1709                  * future:
1710                  */
1711                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1712                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1713         }
1714 }
1715
1716 /* caller must hold client_lock */
1717 static struct nfsd4_session *
1718 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1719 {
1720         struct nfsd4_session *elem;
1721         int idx;
1722         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1723
1724         lockdep_assert_held(&nn->client_lock);
1725
1726         dump_sessionid(__func__, sessionid);
1727         idx = hash_sessionid(sessionid);
1728         /* Search in the appropriate list */
1729         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1730                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1731                             NFS4_MAX_SESSIONID_LEN)) {
1732                         return elem;
1733                 }
1734         }
1735
1736         dprintk("%s: session not found\n", __func__);
1737         return NULL;
1738 }
1739
1740 static struct nfsd4_session *
1741 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1742                 __be32 *ret)
1743 {
1744         struct nfsd4_session *session;
1745         __be32 status = nfserr_badsession;
1746
1747         session = __find_in_sessionid_hashtbl(sessionid, net);
1748         if (!session)
1749                 goto out;
1750         status = nfsd4_get_session_locked(session);
1751         if (status)
1752                 session = NULL;
1753 out:
1754         *ret = status;
1755         return session;
1756 }
1757
1758 /* caller must hold client_lock */
1759 static void
1760 unhash_session(struct nfsd4_session *ses)
1761 {
1762         struct nfs4_client *clp = ses->se_client;
1763         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1764
1765         lockdep_assert_held(&nn->client_lock);
1766
1767         list_del(&ses->se_hash);
1768         spin_lock(&ses->se_client->cl_lock);
1769         list_del(&ses->se_perclnt);
1770         spin_unlock(&ses->se_client->cl_lock);
1771 }
1772
1773 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1774 static int
1775 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1776 {
1777         /*
1778          * We're assuming the clid was not given out from a boot
1779          * precisely 2^32 (about 136 years) before this one.  That seems
1780          * a safe assumption:
1781          */
1782         if (clid->cl_boot == (u32)nn->boot_time)
1783                 return 0;
1784         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1785                 clid->cl_boot, clid->cl_id, nn->boot_time);
1786         return 1;
1787 }
1788
1789 /*
1790  * XXX Should we use a slab cache ?
1791  * This type of memory management is somewhat inefficient, but we use it
1792  * anyway since SETCLIENTID is not a common operation.
1793  */
1794 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1795 {
1796         struct nfs4_client *clp;
1797         int i;
1798
1799         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1800         if (clp == NULL)
1801                 return NULL;
1802         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1803         if (clp->cl_name.data == NULL)
1804                 goto err_no_name;
1805         clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
1806                         OWNER_HASH_SIZE, GFP_KERNEL);
1807         if (!clp->cl_ownerstr_hashtbl)
1808                 goto err_no_hashtbl;
1809         for (i = 0; i < OWNER_HASH_SIZE; i++)
1810                 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1811         clp->cl_name.len = name.len;
1812         INIT_LIST_HEAD(&clp->cl_sessions);
1813         idr_init(&clp->cl_stateids);
1814         atomic_set(&clp->cl_refcount, 0);
1815         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1816         INIT_LIST_HEAD(&clp->cl_idhash);
1817         INIT_LIST_HEAD(&clp->cl_openowners);
1818         INIT_LIST_HEAD(&clp->cl_delegations);
1819         INIT_LIST_HEAD(&clp->cl_lru);
1820         INIT_LIST_HEAD(&clp->cl_revoked);
1821 #ifdef CONFIG_NFSD_PNFS
1822         INIT_LIST_HEAD(&clp->cl_lo_states);
1823 #endif
1824         spin_lock_init(&clp->cl_lock);
1825         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1826         return clp;
1827 err_no_hashtbl:
1828         kfree(clp->cl_name.data);
1829 err_no_name:
1830         kfree(clp);
1831         return NULL;
1832 }
1833
1834 static void
1835 free_client(struct nfs4_client *clp)
1836 {
1837         while (!list_empty(&clp->cl_sessions)) {
1838                 struct nfsd4_session *ses;
1839                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1840                                 se_perclnt);
1841                 list_del(&ses->se_perclnt);
1842                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1843                 free_session(ses);
1844         }
1845         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1846         free_svc_cred(&clp->cl_cred);
1847         kfree(clp->cl_ownerstr_hashtbl);
1848         kfree(clp->cl_name.data);
1849         idr_destroy(&clp->cl_stateids);
1850         kfree(clp);
1851 }
1852
1853 /* must be called under the client_lock */
1854 static void
1855 unhash_client_locked(struct nfs4_client *clp)
1856 {
1857         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1858         struct nfsd4_session *ses;
1859
1860         lockdep_assert_held(&nn->client_lock);
1861
1862         /* Mark the client as expired! */
1863         clp->cl_time = 0;
1864         /* Make it invisible */
1865         if (!list_empty(&clp->cl_idhash)) {
1866                 list_del_init(&clp->cl_idhash);
1867                 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1868                         rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1869                 else
1870                         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1871         }
1872         list_del_init(&clp->cl_lru);
1873         spin_lock(&clp->cl_lock);
1874         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1875                 list_del_init(&ses->se_hash);
1876         spin_unlock(&clp->cl_lock);
1877 }
1878
1879 static void
1880 unhash_client(struct nfs4_client *clp)
1881 {
1882         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1883
1884         spin_lock(&nn->client_lock);
1885         unhash_client_locked(clp);
1886         spin_unlock(&nn->client_lock);
1887 }
1888
1889 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1890 {
1891         if (atomic_read(&clp->cl_refcount))
1892                 return nfserr_jukebox;
1893         unhash_client_locked(clp);
1894         return nfs_ok;
1895 }
1896
1897 static void
1898 __destroy_client(struct nfs4_client *clp)
1899 {
1900         int i;
1901         struct nfs4_openowner *oo;
1902         struct nfs4_delegation *dp;
1903         struct list_head reaplist;
1904
1905         INIT_LIST_HEAD(&reaplist);
1906         spin_lock(&state_lock);
1907         while (!list_empty(&clp->cl_delegations)) {
1908                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1909                 WARN_ON(!unhash_delegation_locked(dp));
1910                 list_add(&dp->dl_recall_lru, &reaplist);
1911         }
1912         spin_unlock(&state_lock);
1913         while (!list_empty(&reaplist)) {
1914                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1915                 list_del_init(&dp->dl_recall_lru);
1916                 put_clnt_odstate(dp->dl_clnt_odstate);
1917                 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
1918                 nfs4_put_stid(&dp->dl_stid);
1919         }
1920         while (!list_empty(&clp->cl_revoked)) {
1921                 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
1922                 list_del_init(&dp->dl_recall_lru);
1923                 nfs4_put_stid(&dp->dl_stid);
1924         }
1925         while (!list_empty(&clp->cl_openowners)) {
1926                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1927                 nfs4_get_stateowner(&oo->oo_owner);
1928                 release_openowner(oo);
1929         }
1930         for (i = 0; i < OWNER_HASH_SIZE; i++) {
1931                 struct nfs4_stateowner *so, *tmp;
1932
1933                 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
1934                                          so_strhash) {
1935                         /* Should be no openowners at this point */
1936                         WARN_ON_ONCE(so->so_is_open_owner);
1937                         remove_blocked_locks(lockowner(so));
1938                 }
1939         }
1940         nfsd4_return_all_client_layouts(clp);
1941         nfsd4_shutdown_callback(clp);
1942         if (clp->cl_cb_conn.cb_xprt)
1943                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1944         free_client(clp);
1945 }
1946
1947 static void
1948 destroy_client(struct nfs4_client *clp)
1949 {
1950         unhash_client(clp);
1951         __destroy_client(clp);
1952 }
1953
1954 static void expire_client(struct nfs4_client *clp)
1955 {
1956         unhash_client(clp);
1957         nfsd4_client_record_remove(clp);
1958         __destroy_client(clp);
1959 }
1960
1961 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1962 {
1963         memcpy(target->cl_verifier.data, source->data,
1964                         sizeof(target->cl_verifier.data));
1965 }
1966
1967 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1968 {
1969         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1970         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1971 }
1972
1973 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1974 {
1975         target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
1976         target->cr_raw_principal = kstrdup(source->cr_raw_principal,
1977                                                                 GFP_KERNEL);
1978         if ((source->cr_principal && ! target->cr_principal) ||
1979             (source->cr_raw_principal && ! target->cr_raw_principal))
1980                 return -ENOMEM;
1981
1982         target->cr_flavor = source->cr_flavor;
1983         target->cr_uid = source->cr_uid;
1984         target->cr_gid = source->cr_gid;
1985         target->cr_group_info = source->cr_group_info;
1986         get_group_info(target->cr_group_info);
1987         target->cr_gss_mech = source->cr_gss_mech;
1988         if (source->cr_gss_mech)
1989                 gss_mech_get(source->cr_gss_mech);
1990         return 0;
1991 }
1992
1993 static int
1994 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1995 {
1996         if (o1->len < o2->len)
1997                 return -1;
1998         if (o1->len > o2->len)
1999                 return 1;
2000         return memcmp(o1->data, o2->data, o1->len);
2001 }
2002
2003 static int same_name(const char *n1, const char *n2)
2004 {
2005         return 0 == memcmp(n1, n2, HEXDIR_LEN);
2006 }
2007
2008 static int
2009 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2010 {
2011         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2012 }
2013
2014 static int
2015 same_clid(clientid_t *cl1, clientid_t *cl2)
2016 {
2017         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2018 }
2019
2020 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2021 {
2022         int i;
2023
2024         if (g1->ngroups != g2->ngroups)
2025                 return false;
2026         for (i=0; i<g1->ngroups; i++)
2027                 if (!gid_eq(g1->gid[i], g2->gid[i]))
2028                         return false;
2029         return true;
2030 }
2031
2032 /*
2033  * RFC 3530 language requires clid_inuse be returned when the
2034  * "principal" associated with a requests differs from that previously
2035  * used.  We use uid, gid's, and gss principal string as our best
2036  * approximation.  We also don't want to allow non-gss use of a client
2037  * established using gss: in theory cr_principal should catch that
2038  * change, but in practice cr_principal can be null even in the gss case
2039  * since gssd doesn't always pass down a principal string.
2040  */
2041 static bool is_gss_cred(struct svc_cred *cr)
2042 {
2043         /* Is cr_flavor one of the gss "pseudoflavors"?: */
2044         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2045 }
2046
2047
2048 static bool
2049 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2050 {
2051         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2052                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2053                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2054                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2055                 return false;
2056         if (cr1->cr_principal == cr2->cr_principal)
2057                 return true;
2058         if (!cr1->cr_principal || !cr2->cr_principal)
2059                 return false;
2060         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2061 }
2062
2063 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2064 {
2065         struct svc_cred *cr = &rqstp->rq_cred;
2066         u32 service;
2067
2068         if (!cr->cr_gss_mech)
2069                 return false;
2070         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2071         return service == RPC_GSS_SVC_INTEGRITY ||
2072                service == RPC_GSS_SVC_PRIVACY;
2073 }
2074
2075 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2076 {
2077         struct svc_cred *cr = &rqstp->rq_cred;
2078
2079         if (!cl->cl_mach_cred)
2080                 return true;
2081         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2082                 return false;
2083         if (!svc_rqst_integrity_protected(rqstp))
2084                 return false;
2085         if (cl->cl_cred.cr_raw_principal)
2086                 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2087                                                 cr->cr_raw_principal);
2088         if (!cr->cr_principal)
2089                 return false;
2090         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2091 }
2092
2093 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2094 {
2095         __be32 verf[2];
2096
2097         /*
2098          * This is opaque to client, so no need to byte-swap. Use
2099          * __force to keep sparse happy
2100          */
2101         verf[0] = (__force __be32)get_seconds();
2102         verf[1] = (__force __be32)nn->clverifier_counter++;
2103         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2104 }
2105
2106 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2107 {
2108         clp->cl_clientid.cl_boot = nn->boot_time;
2109         clp->cl_clientid.cl_id = nn->clientid_counter++;
2110         gen_confirm(clp, nn);
2111 }
2112
2113 static struct nfs4_stid *
2114 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2115 {
2116         struct nfs4_stid *ret;
2117
2118         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2119         if (!ret || !ret->sc_type)
2120                 return NULL;
2121         return ret;
2122 }
2123
2124 static struct nfs4_stid *
2125 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2126 {
2127         struct nfs4_stid *s;
2128
2129         spin_lock(&cl->cl_lock);
2130         s = find_stateid_locked(cl, t);
2131         if (s != NULL) {
2132                 if (typemask & s->sc_type)
2133                         atomic_inc(&s->sc_count);
2134                 else
2135                         s = NULL;
2136         }
2137         spin_unlock(&cl->cl_lock);
2138         return s;
2139 }
2140
2141 static struct nfs4_client *create_client(struct xdr_netobj name,
2142                 struct svc_rqst *rqstp, nfs4_verifier *verf)
2143 {
2144         struct nfs4_client *clp;
2145         struct sockaddr *sa = svc_addr(rqstp);
2146         int ret;
2147         struct net *net = SVC_NET(rqstp);
2148
2149         clp = alloc_client(name);
2150         if (clp == NULL)
2151                 return NULL;
2152
2153         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2154         if (ret) {
2155                 free_client(clp);
2156                 return NULL;
2157         }
2158         nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2159         clp->cl_time = get_seconds();
2160         clear_bit(0, &clp->cl_cb_slot_busy);
2161         copy_verf(clp, verf);
2162         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
2163         clp->cl_cb_session = NULL;
2164         clp->net = net;
2165         return clp;
2166 }
2167
2168 static void
2169 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2170 {
2171         struct rb_node **new = &(root->rb_node), *parent = NULL;
2172         struct nfs4_client *clp;
2173
2174         while (*new) {
2175                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2176                 parent = *new;
2177
2178                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2179                         new = &((*new)->rb_left);
2180                 else
2181                         new = &((*new)->rb_right);
2182         }
2183
2184         rb_link_node(&new_clp->cl_namenode, parent, new);
2185         rb_insert_color(&new_clp->cl_namenode, root);
2186 }
2187
2188 static struct nfs4_client *
2189 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2190 {
2191         int cmp;
2192         struct rb_node *node = root->rb_node;
2193         struct nfs4_client *clp;
2194
2195         while (node) {
2196                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2197                 cmp = compare_blob(&clp->cl_name, name);
2198                 if (cmp > 0)
2199                         node = node->rb_left;
2200                 else if (cmp < 0)
2201                         node = node->rb_right;
2202                 else
2203                         return clp;
2204         }
2205         return NULL;
2206 }
2207
2208 static void
2209 add_to_unconfirmed(struct nfs4_client *clp)
2210 {
2211         unsigned int idhashval;
2212         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2213
2214         lockdep_assert_held(&nn->client_lock);
2215
2216         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2217         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2218         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2219         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2220         renew_client_locked(clp);
2221 }
2222
2223 static void
2224 move_to_confirmed(struct nfs4_client *clp)
2225 {
2226         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2227         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2228
2229         lockdep_assert_held(&nn->client_lock);
2230
2231         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2232         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2233         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2234         add_clp_to_name_tree(clp, &nn->conf_name_tree);
2235         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2236         renew_client_locked(clp);
2237 }
2238
2239 static struct nfs4_client *
2240 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2241 {
2242         struct nfs4_client *clp;
2243         unsigned int idhashval = clientid_hashval(clid->cl_id);
2244
2245         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2246                 if (same_clid(&clp->cl_clientid, clid)) {
2247                         if ((bool)clp->cl_minorversion != sessions)
2248                                 return NULL;
2249                         renew_client_locked(clp);
2250                         return clp;
2251                 }
2252         }
2253         return NULL;
2254 }
2255
2256 static struct nfs4_client *
2257 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2258 {
2259         struct list_head *tbl = nn->conf_id_hashtbl;
2260
2261         lockdep_assert_held(&nn->client_lock);
2262         return find_client_in_id_table(tbl, clid, sessions);
2263 }
2264
2265 static struct nfs4_client *
2266 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2267 {
2268         struct list_head *tbl = nn->unconf_id_hashtbl;
2269
2270         lockdep_assert_held(&nn->client_lock);
2271         return find_client_in_id_table(tbl, clid, sessions);
2272 }
2273
2274 static bool clp_used_exchangeid(struct nfs4_client *clp)
2275 {
2276         return clp->cl_exchange_flags != 0;
2277 }
2278
2279 static struct nfs4_client *
2280 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2281 {
2282         lockdep_assert_held(&nn->client_lock);
2283         return find_clp_in_name_tree(name, &nn->conf_name_tree);
2284 }
2285
2286 static struct nfs4_client *
2287 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2288 {
2289         lockdep_assert_held(&nn->client_lock);
2290         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2291 }
2292
2293 static void
2294 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2295 {
2296         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2297         struct sockaddr *sa = svc_addr(rqstp);
2298         u32 scopeid = rpc_get_scope_id(sa);
2299         unsigned short expected_family;
2300
2301         /* Currently, we only support tcp and tcp6 for the callback channel */
2302         if (se->se_callback_netid_len == 3 &&
2303             !memcmp(se->se_callback_netid_val, "tcp", 3))
2304                 expected_family = AF_INET;
2305         else if (se->se_callback_netid_len == 4 &&
2306                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
2307                 expected_family = AF_INET6;
2308         else
2309                 goto out_err;
2310
2311         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2312                                             se->se_callback_addr_len,
2313                                             (struct sockaddr *)&conn->cb_addr,
2314                                             sizeof(conn->cb_addr));
2315
2316         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2317                 goto out_err;
2318
2319         if (conn->cb_addr.ss_family == AF_INET6)
2320                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2321
2322         conn->cb_prog = se->se_callback_prog;
2323         conn->cb_ident = se->se_callback_ident;
2324         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2325         return;
2326 out_err:
2327         conn->cb_addr.ss_family = AF_UNSPEC;
2328         conn->cb_addrlen = 0;
2329         dprintk("NFSD: this client (clientid %08x/%08x) "
2330                 "will not receive delegations\n",
2331                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2332
2333         return;
2334 }
2335
2336 /*
2337  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2338  */
2339 static void
2340 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2341 {
2342         struct xdr_buf *buf = resp->xdr.buf;
2343         struct nfsd4_slot *slot = resp->cstate.slot;
2344         unsigned int base;
2345
2346         dprintk("--> %s slot %p\n", __func__, slot);
2347
2348         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2349         slot->sl_opcnt = resp->opcnt;
2350         slot->sl_status = resp->cstate.status;
2351         free_svc_cred(&slot->sl_cred);
2352         copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2353
2354         if (!nfsd4_cache_this(resp)) {
2355                 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2356                 return;
2357         }
2358         slot->sl_flags |= NFSD4_SLOT_CACHED;
2359
2360         base = resp->cstate.data_offset;
2361         slot->sl_datalen = buf->len - base;
2362         if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2363                 WARN(1, "%s: sessions DRC could not cache compound\n",
2364                      __func__);
2365         return;
2366 }
2367
2368 /*
2369  * Encode the replay sequence operation from the slot values.
2370  * If cachethis is FALSE encode the uncached rep error on the next
2371  * operation which sets resp->p and increments resp->opcnt for
2372  * nfs4svc_encode_compoundres.
2373  *
2374  */
2375 static __be32
2376 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2377                           struct nfsd4_compoundres *resp)
2378 {
2379         struct nfsd4_op *op;
2380         struct nfsd4_slot *slot = resp->cstate.slot;
2381
2382         /* Encode the replayed sequence operation */
2383         op = &args->ops[resp->opcnt - 1];
2384         nfsd4_encode_operation(resp, op);
2385
2386         if (slot->sl_flags & NFSD4_SLOT_CACHED)
2387                 return op->status;
2388         if (args->opcnt == 1) {
2389                 /*
2390                  * The original operation wasn't a solo sequence--we
2391                  * always cache those--so this retry must not match the
2392                  * original:
2393                  */
2394                 op->status = nfserr_seq_false_retry;
2395         } else {
2396                 op = &args->ops[resp->opcnt++];
2397                 op->status = nfserr_retry_uncached_rep;
2398                 nfsd4_encode_operation(resp, op);
2399         }
2400         return op->status;
2401 }
2402
2403 /*
2404  * The sequence operation is not cached because we can use the slot and
2405  * session values.
2406  */
2407 static __be32
2408 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2409                          struct nfsd4_sequence *seq)
2410 {
2411         struct nfsd4_slot *slot = resp->cstate.slot;
2412         struct xdr_stream *xdr = &resp->xdr;
2413         __be32 *p;
2414         __be32 status;
2415
2416         dprintk("--> %s slot %p\n", __func__, slot);
2417
2418         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2419         if (status)
2420                 return status;
2421
2422         p = xdr_reserve_space(xdr, slot->sl_datalen);
2423         if (!p) {
2424                 WARN_ON_ONCE(1);
2425                 return nfserr_serverfault;
2426         }
2427         xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2428         xdr_commit_encode(xdr);
2429
2430         resp->opcnt = slot->sl_opcnt;
2431         return slot->sl_status;
2432 }
2433
2434 /*
2435  * Set the exchange_id flags returned by the server.
2436  */
2437 static void
2438 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2439 {
2440 #ifdef CONFIG_NFSD_PNFS
2441         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2442 #else
2443         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2444 #endif
2445
2446         /* Referrals are supported, Migration is not. */
2447         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2448
2449         /* set the wire flags to return to client. */
2450         clid->flags = new->cl_exchange_flags;
2451 }
2452
2453 static bool client_has_openowners(struct nfs4_client *clp)
2454 {
2455         struct nfs4_openowner *oo;
2456
2457         list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2458                 if (!list_empty(&oo->oo_owner.so_stateids))
2459                         return true;
2460         }
2461         return false;
2462 }
2463
2464 static bool client_has_state(struct nfs4_client *clp)
2465 {
2466         return client_has_openowners(clp)
2467 #ifdef CONFIG_NFSD_PNFS
2468                 || !list_empty(&clp->cl_lo_states)
2469 #endif
2470                 || !list_empty(&clp->cl_delegations)
2471                 || !list_empty(&clp->cl_sessions);
2472 }
2473
2474 __be32
2475 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2476                 union nfsd4_op_u *u)
2477 {
2478         struct nfsd4_exchange_id *exid = &u->exchange_id;
2479         struct nfs4_client *conf, *new;
2480         struct nfs4_client *unconf = NULL;
2481         __be32 status;
2482         char                    addr_str[INET6_ADDRSTRLEN];
2483         nfs4_verifier           verf = exid->verifier;
2484         struct sockaddr         *sa = svc_addr(rqstp);
2485         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2486         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2487
2488         rpc_ntop(sa, addr_str, sizeof(addr_str));
2489         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2490                 "ip_addr=%s flags %x, spa_how %d\n",
2491                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2492                 addr_str, exid->flags, exid->spa_how);
2493
2494         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2495                 return nfserr_inval;
2496
2497         new = create_client(exid->clname, rqstp, &verf);
2498         if (new == NULL)
2499                 return nfserr_jukebox;
2500
2501         switch (exid->spa_how) {
2502         case SP4_MACH_CRED:
2503                 exid->spo_must_enforce[0] = 0;
2504                 exid->spo_must_enforce[1] = (
2505                         1 << (OP_BIND_CONN_TO_SESSION - 32) |
2506                         1 << (OP_EXCHANGE_ID - 32) |
2507                         1 << (OP_CREATE_SESSION - 32) |
2508                         1 << (OP_DESTROY_SESSION - 32) |
2509                         1 << (OP_DESTROY_CLIENTID - 32));
2510
2511                 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
2512                                         1 << (OP_OPEN_DOWNGRADE) |
2513                                         1 << (OP_LOCKU) |
2514                                         1 << (OP_DELEGRETURN));
2515
2516                 exid->spo_must_allow[1] &= (
2517                                         1 << (OP_TEST_STATEID - 32) |
2518                                         1 << (OP_FREE_STATEID - 32));
2519                 if (!svc_rqst_integrity_protected(rqstp)) {
2520                         status = nfserr_inval;
2521                         goto out_nolock;
2522                 }
2523                 /*
2524                  * Sometimes userspace doesn't give us a principal.
2525                  * Which is a bug, really.  Anyway, we can't enforce
2526                  * MACH_CRED in that case, better to give up now:
2527                  */
2528                 if (!new->cl_cred.cr_principal &&
2529                                         !new->cl_cred.cr_raw_principal) {
2530                         status = nfserr_serverfault;
2531                         goto out_nolock;
2532                 }
2533                 new->cl_mach_cred = true;
2534         case SP4_NONE:
2535                 break;
2536         default:                                /* checked by xdr code */
2537                 WARN_ON_ONCE(1);
2538         case SP4_SSV:
2539                 status = nfserr_encr_alg_unsupp;
2540                 goto out_nolock;
2541         }
2542
2543         /* Cases below refer to rfc 5661 section 18.35.4: */
2544         spin_lock(&nn->client_lock);
2545         conf = find_confirmed_client_by_name(&exid->clname, nn);
2546         if (conf) {
2547                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2548                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2549
2550                 if (update) {
2551                         if (!clp_used_exchangeid(conf)) { /* buggy client */
2552                                 status = nfserr_inval;
2553                                 goto out;
2554                         }
2555                         if (!nfsd4_mach_creds_match(conf, rqstp)) {
2556                                 status = nfserr_wrong_cred;
2557                                 goto out;
2558                         }
2559                         if (!creds_match) { /* case 9 */
2560                                 status = nfserr_perm;
2561                                 goto out;
2562                         }
2563                         if (!verfs_match) { /* case 8 */
2564                                 status = nfserr_not_same;
2565                                 goto out;
2566                         }
2567                         /* case 6 */
2568                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2569                         goto out_copy;
2570                 }
2571                 if (!creds_match) { /* case 3 */
2572                         if (client_has_state(conf)) {
2573                                 status = nfserr_clid_inuse;
2574                                 goto out;
2575                         }
2576                         goto out_new;
2577                 }
2578                 if (verfs_match) { /* case 2 */
2579                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2580                         goto out_copy;
2581                 }
2582                 /* case 5, client reboot */
2583                 conf = NULL;
2584                 goto out_new;
2585         }
2586
2587         if (update) { /* case 7 */
2588                 status = nfserr_noent;
2589                 goto out;
2590         }
2591
2592         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
2593         if (unconf) /* case 4, possible retry or client restart */
2594                 unhash_client_locked(unconf);
2595
2596         /* case 1 (normal case) */
2597 out_new:
2598         if (conf) {
2599                 status = mark_client_expired_locked(conf);
2600                 if (status)
2601                         goto out;
2602         }
2603         new->cl_minorversion = cstate->minorversion;
2604         new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
2605         new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
2606
2607         gen_clid(new, nn);
2608         add_to_unconfirmed(new);
2609         swap(new, conf);
2610 out_copy:
2611         exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2612         exid->clientid.cl_id = conf->cl_clientid.cl_id;
2613
2614         exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2615         nfsd4_set_ex_flags(conf, exid);
2616
2617         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2618                 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2619         status = nfs_ok;
2620
2621 out:
2622         spin_unlock(&nn->client_lock);
2623 out_nolock:
2624         if (new)
2625                 expire_client(new);
2626         if (unconf)
2627                 expire_client(unconf);
2628         return status;
2629 }
2630
2631 static __be32
2632 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2633 {
2634         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2635                 slot_seqid);
2636
2637         /* The slot is in use, and no response has been sent. */
2638         if (slot_inuse) {
2639                 if (seqid == slot_seqid)
2640                         return nfserr_jukebox;
2641                 else
2642                         return nfserr_seq_misordered;
2643         }
2644         /* Note unsigned 32-bit arithmetic handles wraparound: */
2645         if (likely(seqid == slot_seqid + 1))
2646                 return nfs_ok;
2647         if (seqid == slot_seqid)
2648                 return nfserr_replay_cache;
2649         return nfserr_seq_misordered;
2650 }
2651
2652 /*
2653  * Cache the create session result into the create session single DRC
2654  * slot cache by saving the xdr structure. sl_seqid has been set.
2655  * Do this for solo or embedded create session operations.
2656  */
2657 static void
2658 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2659                            struct nfsd4_clid_slot *slot, __be32 nfserr)
2660 {
2661         slot->sl_status = nfserr;
2662         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2663 }
2664
2665 static __be32
2666 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2667                             struct nfsd4_clid_slot *slot)
2668 {
2669         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2670         return slot->sl_status;
2671 }
2672
2673 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2674                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2675                         1 +     /* MIN tag is length with zero, only length */ \
2676                         3 +     /* version, opcount, opcode */ \
2677                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2678                                 /* seqid, slotID, slotID, cache */ \
2679                         4 ) * sizeof(__be32))
2680
2681 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2682                         2 +     /* verifier: AUTH_NULL, length 0 */\
2683                         1 +     /* status */ \
2684                         1 +     /* MIN tag is length with zero, only length */ \
2685                         3 +     /* opcount, opcode, opstatus*/ \
2686                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2687                                 /* seqid, slotID, slotID, slotID, status */ \
2688                         5 ) * sizeof(__be32))
2689
2690 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2691 {
2692         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2693
2694         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2695                 return nfserr_toosmall;
2696         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2697                 return nfserr_toosmall;
2698         ca->headerpadsz = 0;
2699         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2700         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2701         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2702         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2703                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2704         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2705         /*
2706          * Note decreasing slot size below client's request may make it
2707          * difficult for client to function correctly, whereas
2708          * decreasing the number of slots will (just?) affect
2709          * performance.  When short on memory we therefore prefer to
2710          * decrease number of slots instead of their size.  Clients that
2711          * request larger slots than they need will get poor results:
2712          */
2713         ca->maxreqs = nfsd4_get_drc_mem(ca);
2714         if (!ca->maxreqs)
2715                 return nfserr_jukebox;
2716
2717         return nfs_ok;
2718 }
2719
2720 /*
2721  * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2722  * These are based on similar macros in linux/sunrpc/msg_prot.h .
2723  */
2724 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2725         (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2726
2727 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2728         (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2729
2730 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
2731                                  RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2732 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
2733                                  RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2734                                  sizeof(__be32))
2735
2736 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2737 {
2738         ca->headerpadsz = 0;
2739
2740         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2741                 return nfserr_toosmall;
2742         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2743                 return nfserr_toosmall;
2744         ca->maxresp_cached = 0;
2745         if (ca->maxops < 2)
2746                 return nfserr_toosmall;
2747
2748         return nfs_ok;
2749 }
2750
2751 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2752 {
2753         switch (cbs->flavor) {
2754         case RPC_AUTH_NULL:
2755         case RPC_AUTH_UNIX:
2756                 return nfs_ok;
2757         default:
2758                 /*
2759                  * GSS case: the spec doesn't allow us to return this
2760                  * error.  But it also doesn't allow us not to support
2761                  * GSS.
2762                  * I'd rather this fail hard than return some error the
2763                  * client might think it can already handle:
2764                  */
2765                 return nfserr_encr_alg_unsupp;
2766         }
2767 }
2768
2769 __be32
2770 nfsd4_create_session(struct svc_rqst *rqstp,
2771                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2772 {
2773         struct nfsd4_create_session *cr_ses = &u->create_session;
2774         struct sockaddr *sa = svc_addr(rqstp);
2775         struct nfs4_client *conf, *unconf;
2776         struct nfs4_client *old = NULL;
2777         struct nfsd4_session *new;
2778         struct nfsd4_conn *conn;
2779         struct nfsd4_clid_slot *cs_slot = NULL;
2780         __be32 status = 0;
2781         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2782
2783         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2784                 return nfserr_inval;
2785         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2786         if (status)
2787                 return status;
2788         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2789         if (status)
2790                 return status;
2791         status = check_backchannel_attrs(&cr_ses->back_channel);
2792         if (status)
2793                 goto out_release_drc_mem;
2794         status = nfserr_jukebox;
2795         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2796         if (!new)
2797                 goto out_release_drc_mem;
2798         conn = alloc_conn_from_crses(rqstp, cr_ses);
2799         if (!conn)
2800                 goto out_free_session;
2801
2802         spin_lock(&nn->client_lock);
2803         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2804         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2805         WARN_ON_ONCE(conf && unconf);
2806
2807         if (conf) {
2808                 status = nfserr_wrong_cred;
2809                 if (!nfsd4_mach_creds_match(conf, rqstp))
2810                         goto out_free_conn;
2811                 cs_slot = &conf->cl_cs_slot;
2812                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2813                 if (status) {
2814                         if (status == nfserr_replay_cache)
2815                                 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2816                         goto out_free_conn;
2817                 }
2818         } else if (unconf) {
2819                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2820                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2821                         status = nfserr_clid_inuse;
2822                         goto out_free_conn;
2823                 }
2824                 status = nfserr_wrong_cred;
2825                 if (!nfsd4_mach_creds_match(unconf, rqstp))
2826                         goto out_free_conn;
2827                 cs_slot = &unconf->cl_cs_slot;
2828                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2829                 if (status) {
2830                         /* an unconfirmed replay returns misordered */
2831                         status = nfserr_seq_misordered;
2832                         goto out_free_conn;
2833                 }
2834                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2835                 if (old) {
2836                         status = mark_client_expired_locked(old);
2837                         if (status) {
2838                                 old = NULL;
2839                                 goto out_free_conn;
2840                         }
2841                 }
2842                 move_to_confirmed(unconf);
2843                 conf = unconf;
2844         } else {
2845                 status = nfserr_stale_clientid;
2846                 goto out_free_conn;
2847         }
2848         status = nfs_ok;
2849         /* Persistent sessions are not supported */
2850         cr_ses->flags &= ~SESSION4_PERSIST;
2851         /* Upshifting from TCP to RDMA is not supported */
2852         cr_ses->flags &= ~SESSION4_RDMA;
2853
2854         init_session(rqstp, new, conf, cr_ses);
2855         nfsd4_get_session_locked(new);
2856
2857         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2858                NFS4_MAX_SESSIONID_LEN);
2859         cs_slot->sl_seqid++;
2860         cr_ses->seqid = cs_slot->sl_seqid;
2861
2862         /* cache solo and embedded create sessions under the client_lock */
2863         nfsd4_cache_create_session(cr_ses, cs_slot, status);
2864         spin_unlock(&nn->client_lock);
2865         /* init connection and backchannel */
2866         nfsd4_init_conn(rqstp, conn, new);
2867         nfsd4_put_session(new);
2868         if (old)
2869                 expire_client(old);
2870         return status;
2871 out_free_conn:
2872         spin_unlock(&nn->client_lock);
2873         free_conn(conn);
2874         if (old)
2875                 expire_client(old);
2876 out_free_session:
2877         __free_session(new);
2878 out_release_drc_mem:
2879         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2880         return status;
2881 }
2882
2883 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2884 {
2885         switch (*dir) {
2886         case NFS4_CDFC4_FORE:
2887         case NFS4_CDFC4_BACK:
2888                 return nfs_ok;
2889         case NFS4_CDFC4_FORE_OR_BOTH:
2890         case NFS4_CDFC4_BACK_OR_BOTH:
2891                 *dir = NFS4_CDFC4_BOTH;
2892                 return nfs_ok;
2893         };
2894         return nfserr_inval;
2895 }
2896
2897 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
2898                 struct nfsd4_compound_state *cstate,
2899                 union nfsd4_op_u *u)
2900 {
2901         struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
2902         struct nfsd4_session *session = cstate->session;
2903         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2904         __be32 status;
2905
2906         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2907         if (status)
2908                 return status;
2909         spin_lock(&nn->client_lock);
2910         session->se_cb_prog = bc->bc_cb_program;
2911         session->se_cb_sec = bc->bc_cb_sec;
2912         spin_unlock(&nn->client_lock);
2913
2914         nfsd4_probe_callback(session->se_client);
2915
2916         return nfs_ok;
2917 }
2918
2919 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2920                      struct nfsd4_compound_state *cstate,
2921                      union nfsd4_op_u *u)
2922 {
2923         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
2924         __be32 status;
2925         struct nfsd4_conn *conn;
2926         struct nfsd4_session *session;
2927         struct net *net = SVC_NET(rqstp);
2928         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2929
2930         if (!nfsd4_last_compound_op(rqstp))
2931                 return nfserr_not_only_op;
2932         spin_lock(&nn->client_lock);
2933         session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2934         spin_unlock(&nn->client_lock);
2935         if (!session)
2936                 goto out_no_session;
2937         status = nfserr_wrong_cred;
2938         if (!nfsd4_mach_creds_match(session->se_client, rqstp))
2939                 goto out;
2940         status = nfsd4_map_bcts_dir(&bcts->dir);
2941         if (status)
2942                 goto out;
2943         conn = alloc_conn(rqstp, bcts->dir);
2944         status = nfserr_jukebox;
2945         if (!conn)
2946                 goto out;
2947         nfsd4_init_conn(rqstp, conn, session);
2948         status = nfs_ok;
2949 out:
2950         nfsd4_put_session(session);
2951 out_no_session:
2952         return status;
2953 }
2954
2955 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2956 {
2957         if (!session)
2958                 return 0;
2959         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2960 }
2961
2962 __be32
2963 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
2964                 union nfsd4_op_u *u)
2965 {
2966         struct nfsd4_destroy_session *sessionid = &u->destroy_session;
2967         struct nfsd4_session *ses;
2968         __be32 status;
2969         int ref_held_by_me = 0;
2970         struct net *net = SVC_NET(r);
2971         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2972
2973         status = nfserr_not_only_op;
2974         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2975                 if (!nfsd4_last_compound_op(r))
2976                         goto out;
2977                 ref_held_by_me++;
2978         }
2979         dump_sessionid(__func__, &sessionid->sessionid);
2980         spin_lock(&nn->client_lock);
2981         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2982         if (!ses)
2983                 goto out_client_lock;
2984         status = nfserr_wrong_cred;
2985         if (!nfsd4_mach_creds_match(ses->se_client, r))
2986                 goto out_put_session;
2987         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2988         if (status)
2989                 goto out_put_session;
2990         unhash_session(ses);
2991         spin_unlock(&nn->client_lock);
2992
2993         nfsd4_probe_callback_sync(ses->se_client);
2994
2995         spin_lock(&nn->client_lock);
2996         status = nfs_ok;
2997 out_put_session:
2998         nfsd4_put_session_locked(ses);
2999 out_client_lock:
3000         spin_unlock(&nn->client_lock);
3001 out:
3002         return status;
3003 }
3004
3005 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3006 {
3007         struct nfsd4_conn *c;
3008
3009         list_for_each_entry(c, &s->se_conns, cn_persession) {
3010                 if (c->cn_xprt == xpt) {
3011                         return c;
3012                 }
3013         }
3014         return NULL;
3015 }
3016
3017 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3018 {
3019         struct nfs4_client *clp = ses->se_client;
3020         struct nfsd4_conn *c;
3021         __be32 status = nfs_ok;
3022         int ret;
3023
3024         spin_lock(&clp->cl_lock);
3025         c = __nfsd4_find_conn(new->cn_xprt, ses);
3026         if (c)
3027                 goto out_free;
3028         status = nfserr_conn_not_bound_to_session;
3029         if (clp->cl_mach_cred)
3030                 goto out_free;
3031         __nfsd4_hash_conn(new, ses);
3032         spin_unlock(&clp->cl_lock);
3033         ret = nfsd4_register_conn(new);
3034         if (ret)
3035                 /* oops; xprt is already down: */
3036                 nfsd4_conn_lost(&new->cn_xpt_user);
3037         return nfs_ok;
3038 out_free:
3039         spin_unlock(&clp->cl_lock);
3040         free_conn(new);
3041         return status;
3042 }
3043
3044 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3045 {
3046         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3047
3048         return args->opcnt > session->se_fchannel.maxops;
3049 }
3050
3051 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3052                                   struct nfsd4_session *session)
3053 {
3054         struct xdr_buf *xb = &rqstp->rq_arg;
3055
3056         return xb->len > session->se_fchannel.maxreq_sz;
3057 }
3058
3059 static bool replay_matches_cache(struct svc_rqst *rqstp,
3060                  struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3061 {
3062         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3063
3064         if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3065             (bool)seq->cachethis)
3066                 return false;
3067         /*
3068          * If there's an error then the reply can have fewer ops than
3069          * the call.
3070          */
3071         if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
3072                 return false;
3073         /*
3074          * But if we cached a reply with *more* ops than the call you're
3075          * sending us now, then this new call is clearly not really a
3076          * replay of the old one:
3077          */
3078         if (slot->sl_opcnt > argp->opcnt)
3079                 return false;
3080         /* This is the only check explicitly called by spec: */
3081         if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3082                 return false;
3083         /*
3084          * There may be more comparisons we could actually do, but the
3085          * spec doesn't require us to catch every case where the calls
3086          * don't match (that would require caching the call as well as
3087          * the reply), so we don't bother.
3088          */
3089         return true;
3090 }
3091
3092 __be32
3093 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3094                 union nfsd4_op_u *u)
3095 {
3096         struct nfsd4_sequence *seq = &u->sequence;
3097         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3098         struct xdr_stream *xdr = &resp->xdr;
3099         struct nfsd4_session *session;
3100         struct nfs4_client *clp;
3101         struct nfsd4_slot *slot;
3102         struct nfsd4_conn *conn;
3103         __be32 status;
3104         int buflen;
3105         struct net *net = SVC_NET(rqstp);
3106         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3107
3108         if (resp->opcnt != 1)
3109                 return nfserr_sequence_pos;
3110
3111         /*
3112          * Will be either used or freed by nfsd4_sequence_check_conn
3113          * below.
3114          */
3115         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3116         if (!conn)
3117                 return nfserr_jukebox;
3118
3119         spin_lock(&nn->client_lock);
3120         session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3121         if (!session)
3122                 goto out_no_session;
3123         clp = session->se_client;
3124
3125         status = nfserr_too_many_ops;
3126         if (nfsd4_session_too_many_ops(rqstp, session))
3127                 goto out_put_session;
3128
3129         status = nfserr_req_too_big;
3130         if (nfsd4_request_too_big(rqstp, session))
3131                 goto out_put_session;
3132
3133         status = nfserr_badslot;
3134         if (seq->slotid >= session->se_fchannel.maxreqs)
3135                 goto out_put_session;
3136
3137         slot = session->se_slots[seq->slotid];
3138         dprintk("%s: slotid %d\n", __func__, seq->slotid);
3139
3140         /* We do not negotiate the number of slots yet, so set the
3141          * maxslots to the session maxreqs which is used to encode
3142          * sr_highest_slotid and the sr_target_slot id to maxslots */
3143         seq->maxslots = session->se_fchannel.maxreqs;
3144
3145         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3146                                         slot->sl_flags & NFSD4_SLOT_INUSE);
3147         if (status == nfserr_replay_cache) {
3148                 status = nfserr_seq_misordered;
3149                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3150                         goto out_put_session;
3151                 status = nfserr_seq_false_retry;
3152                 if (!replay_matches_cache(rqstp, seq, slot))
3153                         goto out_put_session;
3154                 cstate->slot = slot;
3155                 cstate->session = session;
3156                 cstate->clp = clp;
3157                 /* Return the cached reply status and set cstate->status
3158                  * for nfsd4_proc_compound processing */
3159                 status = nfsd4_replay_cache_entry(resp, seq);
3160                 cstate->status = nfserr_replay_cache;
3161                 goto out;
3162         }
3163         if (status)
3164                 goto out_put_session;
3165
3166         status = nfsd4_sequence_check_conn(conn, session);
3167         conn = NULL;
3168         if (status)
3169                 goto out_put_session;
3170
3171         buflen = (seq->cachethis) ?
3172                         session->se_fchannel.maxresp_cached :
3173                         session->se_fchannel.maxresp_sz;
3174         status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3175                                     nfserr_rep_too_big;
3176         if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3177                 goto out_put_session;
3178         svc_reserve(rqstp, buflen);
3179
3180         status = nfs_ok;
3181         /* Success! bump slot seqid */
3182         slot->sl_seqid = seq->seqid;
3183         slot->sl_flags |= NFSD4_SLOT_INUSE;
3184         if (seq->cachethis)
3185                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3186         else
3187                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3188
3189         cstate->slot = slot;
3190         cstate->session = session;
3191         cstate->clp = clp;
3192
3193 out:
3194         switch (clp->cl_cb_state) {
3195         case NFSD4_CB_DOWN:
3196                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3197                 break;
3198         case NFSD4_CB_FAULT:
3199                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3200                 break;
3201         default:
3202                 seq->status_flags = 0;
3203         }
3204         if (!list_empty(&clp->cl_revoked))
3205                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3206 out_no_session:
3207         if (conn)
3208                 free_conn(conn);
3209         spin_unlock(&nn->client_lock);
3210         return status;
3211 out_put_session:
3212         nfsd4_put_session_locked(session);
3213         goto out_no_session;
3214 }
3215
3216 void
3217 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3218 {
3219         struct nfsd4_compound_state *cs = &resp->cstate;
3220
3221         if (nfsd4_has_session(cs)) {
3222                 if (cs->status != nfserr_replay_cache) {
3223                         nfsd4_store_cache_entry(resp);
3224                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3225                 }
3226                 /* Drop session reference that was taken in nfsd4_sequence() */
3227                 nfsd4_put_session(cs->session);
3228         } else if (cs->clp)
3229                 put_client_renew(cs->clp);
3230 }
3231
3232 __be32
3233 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3234                 struct nfsd4_compound_state *cstate,
3235                 union nfsd4_op_u *u)
3236 {
3237         struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3238         struct nfs4_client *conf, *unconf;
3239         struct nfs4_client *clp = NULL;
3240         __be32 status = 0;
3241         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3242
3243         spin_lock(&nn->client_lock);
3244         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3245         conf = find_confirmed_client(&dc->clientid, true, nn);
3246         WARN_ON_ONCE(conf && unconf);
3247
3248         if (conf) {
3249                 if (client_has_state(conf)) {
3250                         status = nfserr_clientid_busy;
3251                         goto out;
3252                 }
3253                 status = mark_client_expired_locked(conf);
3254                 if (status)
3255                         goto out;
3256                 clp = conf;
3257         } else if (unconf)
3258                 clp = unconf;
3259         else {
3260                 status = nfserr_stale_clientid;
3261                 goto out;
3262         }
3263         if (!nfsd4_mach_creds_match(clp, rqstp)) {
3264                 clp = NULL;
3265                 status = nfserr_wrong_cred;
3266                 goto out;
3267         }
3268         unhash_client_locked(clp);
3269 out:
3270         spin_unlock(&nn->client_lock);
3271         if (clp)
3272                 expire_client(clp);
3273         return status;
3274 }
3275
3276 __be32
3277 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3278                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3279 {
3280         struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3281         __be32 status = 0;
3282
3283         if (rc->rca_one_fs) {
3284                 if (!cstate->current_fh.fh_dentry)
3285                         return nfserr_nofilehandle;
3286                 /*
3287                  * We don't take advantage of the rca_one_fs case.
3288                  * That's OK, it's optional, we can safely ignore it.
3289                  */
3290                 return nfs_ok;
3291         }
3292
3293         status = nfserr_complete_already;
3294         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3295                              &cstate->session->se_client->cl_flags))
3296                 goto out;
3297
3298         status = nfserr_stale_clientid;
3299         if (is_client_expired(cstate->session->se_client))
3300                 /*
3301                  * The following error isn't really legal.
3302                  * But we only get here if the client just explicitly
3303                  * destroyed the client.  Surely it no longer cares what
3304                  * error it gets back on an operation for the dead
3305                  * client.
3306                  */
3307                 goto out;
3308
3309         status = nfs_ok;
3310         nfsd4_client_record_create(cstate->session->se_client);
3311 out:
3312         return status;
3313 }
3314
3315 __be32
3316 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3317                   union nfsd4_op_u *u)
3318 {
3319         struct nfsd4_setclientid *setclid = &u->setclientid;
3320         struct xdr_netobj       clname = setclid->se_name;
3321         nfs4_verifier           clverifier = setclid->se_verf;
3322         struct nfs4_client      *conf, *new;
3323         struct nfs4_client      *unconf = NULL;
3324         __be32                  status;
3325         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3326
3327         new = create_client(clname, rqstp, &clverifier);
3328         if (new == NULL)
3329                 return nfserr_jukebox;
3330         /* Cases below refer to rfc 3530 section 14.2.33: */
3331         spin_lock(&nn->client_lock);
3332         conf = find_confirmed_client_by_name(&clname, nn);
3333         if (conf && client_has_state(conf)) {
3334                 /* case 0: */
3335                 status = nfserr_clid_inuse;
3336                 if (clp_used_exchangeid(conf))
3337                         goto out;
3338                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3339                         char addr_str[INET6_ADDRSTRLEN];
3340                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3341                                  sizeof(addr_str));
3342                         dprintk("NFSD: setclientid: string in use by client "
3343                                 "at %s\n", addr_str);
3344                         goto out;
3345                 }
3346         }
3347         unconf = find_unconfirmed_client_by_name(&clname, nn);
3348         if (unconf)
3349                 unhash_client_locked(unconf);
3350         if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3351                 /* case 1: probable callback update */
3352                 copy_clid(new, conf);
3353                 gen_confirm(new, nn);
3354         } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3355                 gen_clid(new, nn);
3356         new->cl_minorversion = 0;
3357         gen_callback(new, setclid, rqstp);
3358         add_to_unconfirmed(new);
3359         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3360         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3361         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3362         new = NULL;
3363         status = nfs_ok;
3364 out:
3365         spin_unlock(&nn->client_lock);
3366         if (new)
3367                 free_client(new);
3368         if (unconf)
3369                 expire_client(unconf);
3370         return status;
3371 }
3372
3373
3374 __be32
3375 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3376                         struct nfsd4_compound_state *cstate,
3377                         union nfsd4_op_u *u)
3378 {
3379         struct nfsd4_setclientid_confirm *setclientid_confirm =
3380                         &u->setclientid_confirm;
3381         struct nfs4_client *conf, *unconf;
3382         struct nfs4_client *old = NULL;
3383         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3384         clientid_t * clid = &setclientid_confirm->sc_clientid;
3385         __be32 status;
3386         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3387
3388         if (STALE_CLIENTID(clid, nn))
3389                 return nfserr_stale_clientid;
3390
3391         spin_lock(&nn->client_lock);
3392         conf = find_confirmed_client(clid, false, nn);
3393         unconf = find_unconfirmed_client(clid, false, nn);
3394         /*
3395          * We try hard to give out unique clientid's, so if we get an
3396          * attempt to confirm the same clientid with a different cred,
3397          * the client may be buggy; this should never happen.
3398          *
3399          * Nevertheless, RFC 7530 recommends INUSE for this case:
3400          */
3401         status = nfserr_clid_inuse;
3402         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3403                 goto out;
3404         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3405                 goto out;
3406         /* cases below refer to rfc 3530 section 14.2.34: */
3407         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3408                 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3409                         /* case 2: probable retransmit */
3410                         status = nfs_ok;
3411                 } else /* case 4: client hasn't noticed we rebooted yet? */
3412                         status = nfserr_stale_clientid;
3413                 goto out;
3414         }
3415         status = nfs_ok;
3416         if (conf) { /* case 1: callback update */
3417                 old = unconf;
3418                 unhash_client_locked(old);
3419                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3420         } else { /* case 3: normal case; new or rebooted client */
3421                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3422                 if (old) {
3423                         status = nfserr_clid_inuse;
3424                         if (client_has_state(old)
3425                                         && !same_creds(&unconf->cl_cred,
3426                                                         &old->cl_cred)) {
3427                                 old = NULL;
3428                                 goto out;
3429                         }
3430                         status = mark_client_expired_locked(old);
3431                         if (status) {
3432                                 old = NULL;
3433                                 goto out;
3434                         }
3435                 }
3436                 move_to_confirmed(unconf);
3437                 conf = unconf;
3438         }
3439         get_client_locked(conf);
3440         spin_unlock(&nn->client_lock);
3441         nfsd4_probe_callback(conf);
3442         spin_lock(&nn->client_lock);
3443         put_client_renew_locked(conf);
3444 out:
3445         spin_unlock(&nn->client_lock);
3446         if (old)
3447                 expire_client(old);
3448         return status;
3449 }
3450
3451 static struct nfs4_file *nfsd4_alloc_file(void)
3452 {
3453         return kmem_cache_alloc(file_slab, GFP_KERNEL);
3454 }
3455
3456 /* OPEN Share state helper functions */
3457 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3458                                 struct nfs4_file *fp)
3459 {
3460         lockdep_assert_held(&state_lock);
3461
3462         atomic_set(&fp->fi_ref, 1);
3463         spin_lock_init(&fp->fi_lock);
3464         INIT_LIST_HEAD(&fp->fi_stateids);
3465         INIT_LIST_HEAD(&fp->fi_delegations);
3466         INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3467         fh_copy_shallow(&fp->fi_fhandle, fh);
3468         fp->fi_deleg_file = NULL;
3469         fp->fi_had_conflict = false;
3470         fp->fi_share_deny = 0;
3471         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3472         memset(fp->fi_access, 0, sizeof(fp->fi_access));
3473 #ifdef CONFIG_NFSD_PNFS
3474         INIT_LIST_HEAD(&fp->fi_lo_states);
3475         atomic_set(&fp->fi_lo_recalls, 0);
3476 #endif
3477         hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3478 }
3479
3480 void
3481 nfsd4_free_slabs(void)
3482 {
3483         kmem_cache_destroy(odstate_slab);
3484         kmem_cache_destroy(openowner_slab);
3485         kmem_cache_destroy(lockowner_slab);
3486         kmem_cache_destroy(file_slab);
3487         kmem_cache_destroy(stateid_slab);
3488         kmem_cache_destroy(deleg_slab);
3489 }
3490
3491 int
3492 nfsd4_init_slabs(void)
3493 {
3494         openowner_slab = kmem_cache_create("nfsd4_openowners",
3495                         sizeof(struct nfs4_openowner), 0, 0, NULL);
3496         if (openowner_slab == NULL)
3497                 goto out;
3498         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3499                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
3500         if (lockowner_slab == NULL)
3501                 goto out_free_openowner_slab;
3502         file_slab = kmem_cache_create("nfsd4_files",
3503                         sizeof(struct nfs4_file), 0, 0, NULL);
3504         if (file_slab == NULL)
3505                 goto out_free_lockowner_slab;
3506         stateid_slab = kmem_cache_create("nfsd4_stateids",
3507                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3508         if (stateid_slab == NULL)
3509                 goto out_free_file_slab;
3510         deleg_slab = kmem_cache_create("nfsd4_delegations",
3511                         sizeof(struct nfs4_delegation), 0, 0, NULL);
3512         if (deleg_slab == NULL)
3513                 goto out_free_stateid_slab;
3514         odstate_slab = kmem_cache_create("nfsd4_odstate",
3515                         sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3516         if (odstate_slab == NULL)
3517                 goto out_free_deleg_slab;
3518         return 0;
3519
3520 out_free_deleg_slab:
3521         kmem_cache_destroy(deleg_slab);
3522 out_free_stateid_slab:
3523         kmem_cache_destroy(stateid_slab);
3524 out_free_file_slab:
3525         kmem_cache_destroy(file_slab);
3526 out_free_lockowner_slab:
3527         kmem_cache_destroy(lockowner_slab);
3528 out_free_openowner_slab:
3529         kmem_cache_destroy(openowner_slab);
3530 out:
3531         dprintk("nfsd4: out of memory while initializing nfsv4\n");
3532         return -ENOMEM;
3533 }
3534
3535 static void init_nfs4_replay(struct nfs4_replay *rp)
3536 {
3537         rp->rp_status = nfserr_serverfault;
3538         rp->rp_buflen = 0;
3539         rp->rp_buf = rp->rp_ibuf;
3540         mutex_init(&rp->rp_mutex);
3541 }
3542
3543 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3544                 struct nfs4_stateowner *so)
3545 {
3546         if (!nfsd4_has_session(cstate)) {
3547                 mutex_lock(&so->so_replay.rp_mutex);
3548                 cstate->replay_owner = nfs4_get_stateowner(so);
3549         }
3550 }
3551
3552 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3553 {
3554         struct nfs4_stateowner *so = cstate->replay_owner;
3555
3556         if (so != NULL) {
3557                 cstate->replay_owner = NULL;
3558                 mutex_unlock(&so->so_replay.rp_mutex);
3559                 nfs4_put_stateowner(so);
3560         }
3561 }
3562
3563 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3564 {
3565         struct nfs4_stateowner *sop;
3566
3567         sop = kmem_cache_alloc(slab, GFP_KERNEL);
3568         if (!sop)
3569                 return NULL;
3570
3571         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3572         if (!sop->so_owner.data) {
3573                 kmem_cache_free(slab, sop);
3574                 return NULL;
3575         }
3576         sop->so_owner.len = owner->len;
3577
3578         INIT_LIST_HEAD(&sop->so_stateids);
3579         sop->so_client = clp;
3580         init_nfs4_replay(&sop->so_replay);
3581         atomic_set(&sop->so_count, 1);
3582         return sop;
3583 }
3584
3585 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3586 {
3587         lockdep_assert_held(&clp->cl_lock);
3588
3589         list_add(&oo->oo_owner.so_strhash,
3590                  &clp->cl_ownerstr_hashtbl[strhashval]);
3591         list_add(&oo->oo_perclient, &clp->cl_openowners);
3592 }
3593
3594 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3595 {
3596         unhash_openowner_locked(openowner(so));
3597 }
3598
3599 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3600 {
3601         struct nfs4_openowner *oo = openowner(so);
3602
3603         kmem_cache_free(openowner_slab, oo);
3604 }
3605
3606 static const struct nfs4_stateowner_operations openowner_ops = {
3607         .so_unhash =    nfs4_unhash_openowner,
3608         .so_free =      nfs4_free_openowner,
3609 };
3610
3611 static struct nfs4_ol_stateid *
3612 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3613 {
3614         struct nfs4_ol_stateid *local, *ret = NULL;
3615         struct nfs4_openowner *oo = open->op_openowner;
3616
3617         lockdep_assert_held(&fp->fi_lock);
3618
3619         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3620                 /* ignore lock owners */
3621                 if (local->st_stateowner->so_is_open_owner == 0)
3622                         continue;
3623                 if (local->st_stateowner != &oo->oo_owner)
3624                         continue;
3625                 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
3626                         ret = local;
3627                         atomic_inc(&ret->st_stid.sc_count);
3628                         break;
3629                 }
3630         }
3631         return ret;
3632 }
3633
3634 static __be32
3635 nfsd4_verify_open_stid(struct nfs4_stid *s)
3636 {
3637         __be32 ret = nfs_ok;
3638
3639         switch (s->sc_type) {
3640         default:
3641                 break;
3642         case NFS4_CLOSED_STID:
3643         case NFS4_CLOSED_DELEG_STID:
3644                 ret = nfserr_bad_stateid;
3645                 break;
3646         case NFS4_REVOKED_DELEG_STID:
3647                 ret = nfserr_deleg_revoked;
3648         }
3649         return ret;
3650 }
3651
3652 /* Lock the stateid st_mutex, and deal with races with CLOSE */
3653 static __be32
3654 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
3655 {
3656         __be32 ret;
3657
3658         mutex_lock(&stp->st_mutex);
3659         ret = nfsd4_verify_open_stid(&stp->st_stid);
3660         if (ret != nfs_ok)
3661                 mutex_unlock(&stp->st_mutex);
3662         return ret;
3663 }
3664
3665 static struct nfs4_ol_stateid *
3666 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3667 {
3668         struct nfs4_ol_stateid *stp;
3669         for (;;) {
3670                 spin_lock(&fp->fi_lock);
3671                 stp = nfsd4_find_existing_open(fp, open);
3672                 spin_unlock(&fp->fi_lock);
3673                 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
3674                         break;
3675                 nfs4_put_stid(&stp->st_stid);
3676         }
3677         return stp;
3678 }
3679
3680 static struct nfs4_openowner *
3681 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3682                            struct nfsd4_compound_state *cstate)
3683 {
3684         struct nfs4_client *clp = cstate->clp;
3685         struct nfs4_openowner *oo, *ret;
3686
3687         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3688         if (!oo)
3689                 return NULL;
3690         oo->oo_owner.so_ops = &openowner_ops;
3691         oo->oo_owner.so_is_open_owner = 1;
3692         oo->oo_owner.so_seqid = open->op_seqid;
3693         oo->oo_flags = 0;
3694         if (nfsd4_has_session(cstate))
3695                 oo->oo_flags |= NFS4_OO_CONFIRMED;
3696         oo->oo_time = 0;
3697         oo->oo_last_closed_stid = NULL;
3698         INIT_LIST_HEAD(&oo->oo_close_lru);
3699         spin_lock(&clp->cl_lock);
3700         ret = find_openstateowner_str_locked(strhashval, open, clp);
3701         if (ret == NULL) {
3702                 hash_openowner(oo, clp, strhashval);
3703                 ret = oo;
3704         } else
3705                 nfs4_free_stateowner(&oo->oo_owner);
3706
3707         spin_unlock(&clp->cl_lock);
3708         return ret;
3709 }
3710
3711 static struct nfs4_ol_stateid *
3712 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
3713 {
3714
3715         struct nfs4_openowner *oo = open->op_openowner;
3716         struct nfs4_ol_stateid *retstp = NULL;
3717         struct nfs4_ol_stateid *stp;
3718
3719         stp = open->op_stp;
3720         /* We are moving these outside of the spinlocks to avoid the warnings */
3721         mutex_init(&stp->st_mutex);
3722         mutex_lock(&stp->st_mutex);
3723
3724 retry:
3725         spin_lock(&oo->oo_owner.so_client->cl_lock);
3726         spin_lock(&fp->fi_lock);
3727
3728         retstp = nfsd4_find_existing_open(fp, open);
3729         if (retstp)
3730                 goto out_unlock;
3731
3732         open->op_stp = NULL;
3733         atomic_inc(&stp->st_stid.sc_count);
3734         stp->st_stid.sc_type = NFS4_OPEN_STID;
3735         INIT_LIST_HEAD(&stp->st_locks);
3736         stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
3737         get_nfs4_file(fp);
3738         stp->st_stid.sc_file = fp;
3739         stp->st_access_bmap = 0;
3740         stp->st_deny_bmap = 0;
3741         stp->st_openstp = NULL;
3742         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3743         list_add(&stp->st_perfile, &fp->fi_stateids);
3744
3745 out_unlock:
3746         spin_unlock(&fp->fi_lock);
3747         spin_unlock(&oo->oo_owner.so_client->cl_lock);
3748         if (retstp) {
3749                 /* Handle races with CLOSE */
3750                 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
3751                         nfs4_put_stid(&retstp->st_stid);
3752                         goto retry;
3753                 }
3754                 /* To keep mutex tracking happy */
3755                 mutex_unlock(&stp->st_mutex);
3756                 stp = retstp;
3757         }
3758         return stp;
3759 }
3760
3761 /*
3762  * In the 4.0 case we need to keep the owners around a little while to handle
3763  * CLOSE replay. We still do need to release any file access that is held by
3764  * them before returning however.
3765  */
3766 static void
3767 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3768 {
3769         struct nfs4_ol_stateid *last;
3770         struct nfs4_openowner *oo = openowner(s->st_stateowner);
3771         struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3772                                                 nfsd_net_id);
3773
3774         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3775
3776         /*
3777          * We know that we hold one reference via nfsd4_close, and another
3778          * "persistent" reference for the client. If the refcount is higher
3779          * than 2, then there are still calls in progress that are using this
3780          * stateid. We can't put the sc_file reference until they are finished.
3781          * Wait for the refcount to drop to 2. Since it has been unhashed,
3782          * there should be no danger of the refcount going back up again at
3783          * this point.
3784          */
3785         wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2);
3786
3787         release_all_access(s);
3788         if (s->st_stid.sc_file) {
3789                 put_nfs4_file(s->st_stid.sc_file);
3790                 s->st_stid.sc_file = NULL;
3791         }
3792
3793         spin_lock(&nn->client_lock);
3794         last = oo->oo_last_closed_stid;
3795         oo->oo_last_closed_stid = s;
3796         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3797         oo->oo_time = get_seconds();
3798         spin_unlock(&nn->client_lock);
3799         if (last)
3800                 nfs4_put_stid(&last->st_stid);
3801 }
3802
3803 /* search file_hashtbl[] for file */
3804 static struct nfs4_file *
3805 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
3806 {
3807         struct nfs4_file *fp;
3808
3809         hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
3810                 if (fh_match(&fp->fi_fhandle, fh)) {
3811                         if (atomic_inc_not_zero(&fp->fi_ref))
3812                                 return fp;
3813                 }
3814         }
3815         return NULL;
3816 }
3817
3818 struct nfs4_file *
3819 find_file(struct knfsd_fh *fh)
3820 {
3821         struct nfs4_file *fp;
3822         unsigned int hashval = file_hashval(fh);
3823
3824         rcu_read_lock();
3825         fp = find_file_locked(fh, hashval);
3826         rcu_read_unlock();
3827         return fp;
3828 }
3829
3830 static struct nfs4_file *
3831 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3832 {
3833         struct nfs4_file *fp;
3834         unsigned int hashval = file_hashval(fh);
3835
3836         rcu_read_lock();
3837         fp = find_file_locked(fh, hashval);
3838         rcu_read_unlock();
3839         if (fp)
3840                 return fp;
3841
3842         spin_lock(&state_lock);
3843         fp = find_file_locked(fh, hashval);
3844         if (likely(fp == NULL)) {
3845                 nfsd4_init_file(fh, hashval, new);
3846                 fp = new;
3847         }
3848         spin_unlock(&state_lock);
3849
3850         return fp;
3851 }
3852
3853 /*
3854  * Called to check deny when READ with all zero stateid or
3855  * WRITE with all zero or all one stateid
3856  */
3857 static __be32
3858 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3859 {
3860         struct nfs4_file *fp;
3861         __be32 ret = nfs_ok;
3862
3863         fp = find_file(&current_fh->fh_handle);
3864         if (!fp)
3865                 return ret;
3866         /* Check for conflicting share reservations */
3867         spin_lock(&fp->fi_lock);
3868         if (fp->fi_share_deny & deny_type)
3869                 ret = nfserr_locked;
3870         spin_unlock(&fp->fi_lock);
3871         put_nfs4_file(fp);
3872         return ret;
3873 }
3874
3875 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
3876 {
3877         struct nfs4_delegation *dp = cb_to_delegation(cb);
3878         struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3879                                           nfsd_net_id);
3880
3881         block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3882
3883         /*
3884          * We can't do this in nfsd_break_deleg_cb because it is
3885          * already holding inode->i_lock.
3886          *
3887          * If the dl_time != 0, then we know that it has already been
3888          * queued for a lease break. Don't queue it again.
3889          */
3890         spin_lock(&state_lock);
3891         if (delegation_hashed(dp) && dp->dl_time == 0) {
3892                 dp->dl_time = get_seconds();
3893                 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3894         }
3895         spin_unlock(&state_lock);
3896 }
3897
3898 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
3899                 struct rpc_task *task)
3900 {
3901         struct nfs4_delegation *dp = cb_to_delegation(cb);
3902
3903         if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
3904                 return 1;
3905
3906         switch (task->tk_status) {
3907         case 0:
3908                 return 1;
3909         case -EBADHANDLE:
3910         case -NFS4ERR_BAD_STATEID:
3911                 /*
3912                  * Race: client probably got cb_recall before open reply
3913                  * granting delegation.
3914                  */
3915                 if (dp->dl_retries--) {
3916                         rpc_delay(task, 2 * HZ);
3917                         return 0;
3918                 }
3919                 /*FALLTHRU*/
3920         default:
3921                 return -1;
3922         }
3923 }
3924
3925 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
3926 {
3927         struct nfs4_delegation *dp = cb_to_delegation(cb);
3928
3929         nfs4_put_stid(&dp->dl_stid);
3930 }
3931
3932 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
3933         .prepare        = nfsd4_cb_recall_prepare,
3934         .done           = nfsd4_cb_recall_done,
3935         .release        = nfsd4_cb_recall_release,
3936 };
3937
3938 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3939 {
3940         /*
3941          * We're assuming the state code never drops its reference
3942          * without first removing the lease.  Since we're in this lease
3943          * callback (and since the lease code is serialized by the kernel
3944          * lock) we know the server hasn't removed the lease yet, we know
3945          * it's safe to take a reference.
3946          */
3947         atomic_inc(&dp->dl_stid.sc_count);
3948         nfsd4_run_cb(&dp->dl_recall);
3949 }
3950
3951 /* Called from break_lease() with i_lock held. */
3952 static bool
3953 nfsd_break_deleg_cb(struct file_lock *fl)
3954 {
3955         bool ret = false;
3956         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
3957         struct nfs4_delegation *dp;
3958
3959         if (!fp) {
3960                 WARN(1, "(%p)->fl_owner NULL\n", fl);
3961                 return ret;
3962         }
3963         if (fp->fi_had_conflict) {
3964                 WARN(1, "duplicate break on %p\n", fp);
3965                 return ret;
3966         }
3967         /*
3968          * We don't want the locks code to timeout the lease for us;
3969          * we'll remove it ourself if a delegation isn't returned
3970          * in time:
3971          */
3972         fl->fl_break_time = 0;
3973
3974         spin_lock(&fp->fi_lock);
3975         fp->fi_had_conflict = true;
3976         /*
3977          * If there are no delegations on the list, then return true
3978          * so that the lease code will go ahead and delete it.
3979          */
3980         if (list_empty(&fp->fi_delegations))
3981                 ret = true;
3982         else
3983                 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
3984                         nfsd_break_one_deleg(dp);
3985         spin_unlock(&fp->fi_lock);
3986         return ret;
3987 }
3988
3989 static int
3990 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
3991                      struct list_head *dispose)
3992 {
3993         if (arg & F_UNLCK)
3994                 return lease_modify(onlist, arg, dispose);
3995         else
3996                 return -EAGAIN;
3997 }
3998
3999 static const struct lock_manager_operations nfsd_lease_mng_ops = {
4000         .lm_break = nfsd_break_deleg_cb,
4001         .lm_change = nfsd_change_deleg_cb,
4002 };
4003
4004 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
4005 {
4006         if (nfsd4_has_session(cstate))
4007                 return nfs_ok;
4008         if (seqid == so->so_seqid - 1)
4009                 return nfserr_replay_me;
4010         if (seqid == so->so_seqid)
4011                 return nfs_ok;
4012         return nfserr_bad_seqid;
4013 }
4014
4015 static __be32 lookup_clientid(clientid_t *clid,
4016                 struct nfsd4_compound_state *cstate,
4017                 struct nfsd_net *nn)
4018 {
4019         struct nfs4_client *found;
4020
4021         if (cstate->clp) {
4022                 found = cstate->clp;
4023                 if (!same_clid(&found->cl_clientid, clid))
4024                         return nfserr_stale_clientid;
4025                 return nfs_ok;
4026         }
4027
4028         if (STALE_CLIENTID(clid, nn))
4029                 return nfserr_stale_clientid;
4030
4031         /*
4032          * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4033          * cached already then we know this is for is for v4.0 and "sessions"
4034          * will be false.
4035          */
4036         WARN_ON_ONCE(cstate->session);
4037         spin_lock(&nn->client_lock);
4038         found = find_confirmed_client(clid, false, nn);
4039         if (!found) {
4040                 spin_unlock(&nn->client_lock);
4041                 return nfserr_expired;
4042         }
4043         atomic_inc(&found->cl_refcount);
4044         spin_unlock(&nn->client_lock);
4045
4046         /* Cache the nfs4_client in cstate! */
4047         cstate->clp = found;
4048         return nfs_ok;
4049 }
4050
4051 __be32
4052 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4053                     struct nfsd4_open *open, struct nfsd_net *nn)
4054 {
4055         clientid_t *clientid = &open->op_clientid;
4056         struct nfs4_client *clp = NULL;
4057         unsigned int strhashval;
4058         struct nfs4_openowner *oo = NULL;
4059         __be32 status;
4060
4061         if (STALE_CLIENTID(&open->op_clientid, nn))
4062                 return nfserr_stale_clientid;
4063         /*
4064          * In case we need it later, after we've already created the
4065          * file and don't want to risk a further failure:
4066          */
4067         open->op_file = nfsd4_alloc_file();
4068         if (open->op_file == NULL)
4069                 return nfserr_jukebox;
4070
4071         status = lookup_clientid(clientid, cstate, nn);
4072         if (status)
4073                 return status;
4074         clp = cstate->clp;
4075
4076         strhashval = ownerstr_hashval(&open->op_owner);
4077         oo = find_openstateowner_str(strhashval, open, clp);
4078         open->op_openowner = oo;
4079         if (!oo) {
4080                 goto new_owner;
4081         }
4082         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4083                 /* Replace unconfirmed owners without checking for replay. */
4084                 release_openowner(oo);
4085                 open->op_openowner = NULL;
4086                 goto new_owner;
4087         }
4088         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4089         if (status)
4090                 return status;
4091         goto alloc_stateid;
4092 new_owner:
4093         oo = alloc_init_open_stateowner(strhashval, open, cstate);
4094         if (oo == NULL)
4095                 return nfserr_jukebox;
4096         open->op_openowner = oo;
4097 alloc_stateid:
4098         open->op_stp = nfs4_alloc_open_stateid(clp);
4099         if (!open->op_stp)
4100                 return nfserr_jukebox;
4101
4102         if (nfsd4_has_session(cstate) &&
4103             (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4104                 open->op_odstate = alloc_clnt_odstate(clp);
4105                 if (!open->op_odstate)
4106                         return nfserr_jukebox;
4107         }
4108
4109         return nfs_ok;
4110 }
4111
4112 static inline __be32
4113 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4114 {
4115         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4116                 return nfserr_openmode;
4117         else
4118                 return nfs_ok;
4119 }
4120
4121 static int share_access_to_flags(u32 share_access)
4122 {
4123         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4124 }
4125
4126 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4127 {
4128         struct nfs4_stid *ret;
4129
4130         ret = find_stateid_by_type(cl, s,
4131                                 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4132         if (!ret)
4133                 return NULL;
4134         return delegstateid(ret);
4135 }
4136
4137 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4138 {
4139         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4140                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4141 }
4142
4143 static __be32
4144 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4145                 struct nfs4_delegation **dp)
4146 {
4147         int flags;
4148         __be32 status = nfserr_bad_stateid;
4149         struct nfs4_delegation *deleg;
4150
4151         deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4152         if (deleg == NULL)
4153                 goto out;
4154         if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4155                 nfs4_put_stid(&deleg->dl_stid);
4156                 if (cl->cl_minorversion)
4157                         status = nfserr_deleg_revoked;
4158                 goto out;
4159         }
4160         flags = share_access_to_flags(open->op_share_access);
4161         status = nfs4_check_delegmode(deleg, flags);
4162         if (status) {
4163                 nfs4_put_stid(&deleg->dl_stid);
4164                 goto out;
4165         }
4166         *dp = deleg;
4167 out:
4168         if (!nfsd4_is_deleg_cur(open))
4169                 return nfs_ok;
4170         if (status)
4171                 return status;
4172         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4173         return nfs_ok;
4174 }
4175
4176 static inline int nfs4_access_to_access(u32 nfs4_access)
4177 {
4178         int flags = 0;
4179
4180         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4181                 flags |= NFSD_MAY_READ;
4182         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4183                 flags |= NFSD_MAY_WRITE;
4184         return flags;
4185 }
4186
4187 static inline __be32
4188 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4189                 struct nfsd4_open *open)
4190 {
4191         struct iattr iattr = {
4192                 .ia_valid = ATTR_SIZE,
4193                 .ia_size = 0,
4194         };
4195         if (!open->op_truncate)
4196                 return 0;
4197         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4198                 return nfserr_inval;
4199         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
4200 }
4201
4202 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4203                 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4204                 struct nfsd4_open *open)
4205 {
4206         struct file *filp = NULL;
4207         __be32 status;
4208         int oflag = nfs4_access_to_omode(open->op_share_access);
4209         int access = nfs4_access_to_access(open->op_share_access);
4210         unsigned char old_access_bmap, old_deny_bmap;
4211
4212         spin_lock(&fp->fi_lock);
4213
4214         /*
4215          * Are we trying to set a deny mode that would conflict with
4216          * current access?
4217          */
4218         status = nfs4_file_check_deny(fp, open->op_share_deny);
4219         if (status != nfs_ok) {
4220                 spin_unlock(&fp->fi_lock);
4221                 goto out;
4222         }
4223
4224         /* set access to the file */
4225         status = nfs4_file_get_access(fp, open->op_share_access);
4226         if (status != nfs_ok) {
4227                 spin_unlock(&fp->fi_lock);
4228                 goto out;
4229         }
4230
4231         /* Set access bits in stateid */
4232         old_access_bmap = stp->st_access_bmap;
4233         set_access(open->op_share_access, stp);
4234
4235         /* Set new deny mask */
4236         old_deny_bmap = stp->st_deny_bmap;
4237         set_deny(open->op_share_deny, stp);
4238         fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4239
4240         if (!fp->fi_fds[oflag]) {
4241                 spin_unlock(&fp->fi_lock);
4242                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
4243                 if (status)
4244                         goto out_put_access;
4245                 spin_lock(&fp->fi_lock);
4246                 if (!fp->fi_fds[oflag]) {
4247                         fp->fi_fds[oflag] = filp;
4248                         filp = NULL;
4249                 }
4250         }
4251         spin_unlock(&fp->fi_lock);
4252         if (filp)
4253                 fput(filp);
4254
4255         status = nfsd4_truncate(rqstp, cur_fh, open);
4256         if (status)
4257                 goto out_put_access;
4258 out:
4259         return status;
4260 out_put_access:
4261         stp->st_access_bmap = old_access_bmap;
4262         nfs4_file_put_access(fp, open->op_share_access);
4263         reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4264         goto out;
4265 }
4266
4267 static __be32
4268 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
4269 {
4270         __be32 status;
4271         unsigned char old_deny_bmap = stp->st_deny_bmap;
4272
4273         if (!test_access(open->op_share_access, stp))
4274                 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4275
4276         /* test and set deny mode */
4277         spin_lock(&fp->fi_lock);
4278         status = nfs4_file_check_deny(fp, open->op_share_deny);
4279         if (status == nfs_ok) {
4280                 set_deny(open->op_share_deny, stp);
4281                 fp->fi_share_deny |=
4282                                 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4283         }
4284         spin_unlock(&fp->fi_lock);
4285
4286         if (status != nfs_ok)
4287                 return status;
4288
4289         status = nfsd4_truncate(rqstp, cur_fh, open);
4290         if (status != nfs_ok)
4291                 reset_union_bmap_deny(old_deny_bmap, stp);
4292         return status;
4293 }
4294
4295 /* Should we give out recallable state?: */
4296 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4297 {
4298         if (clp->cl_cb_state == NFSD4_CB_UP)
4299                 return true;
4300         /*
4301          * In the sessions case, since we don't have to establish a
4302          * separate connection for callbacks, we assume it's OK
4303          * until we hear otherwise:
4304          */
4305         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4306 }
4307
4308 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
4309 {
4310         struct file_lock *fl;
4311
4312         fl = locks_alloc_lock();
4313         if (!fl)
4314                 return NULL;
4315         fl->fl_lmops = &nfsd_lease_mng_ops;
4316         fl->fl_flags = FL_DELEG;
4317         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4318         fl->fl_end = OFFSET_MAX;
4319         fl->fl_owner = (fl_owner_t)fp;
4320         fl->fl_pid = current->tgid;
4321         return fl;
4322 }
4323
4324 /**
4325  * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
4326  * @dp:   a pointer to the nfs4_delegation we're adding.
4327  *
4328  * Return:
4329  *      On success: Return code will be 0 on success.
4330  *
4331  *      On error: -EAGAIN if there was an existing delegation.
4332  *                 nonzero if there is an error in other cases.
4333  *
4334  */
4335
4336 static int nfs4_setlease(struct nfs4_delegation *dp)
4337 {
4338         struct nfs4_file *fp = dp->dl_stid.sc_file;
4339         struct file_lock *fl;
4340         struct file *filp;
4341         int status = 0;
4342
4343         fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
4344         if (!fl)
4345                 return -ENOMEM;
4346         filp = find_readable_file(fp);
4347         if (!filp) {
4348                 /* We should always have a readable file here */
4349                 WARN_ON_ONCE(1);
4350                 locks_free_lock(fl);
4351                 return -EBADF;
4352         }
4353         fl->fl_file = filp;
4354         status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
4355         if (fl)
4356                 locks_free_lock(fl);
4357         if (status)
4358                 goto out_fput;
4359         spin_lock(&state_lock);
4360         spin_lock(&fp->fi_lock);
4361         /* Did the lease get broken before we took the lock? */
4362         status = -EAGAIN;
4363         if (fp->fi_had_conflict)
4364                 goto out_unlock;
4365         /* Race breaker */
4366         if (fp->fi_deleg_file) {
4367                 status = hash_delegation_locked(dp, fp);
4368                 goto out_unlock;
4369         }
4370         fp->fi_deleg_file = filp;
4371         fp->fi_delegees = 0;
4372         status = hash_delegation_locked(dp, fp);
4373         spin_unlock(&fp->fi_lock);
4374         spin_unlock(&state_lock);
4375         if (status) {
4376                 /* Should never happen, this is a new fi_deleg_file  */
4377                 WARN_ON_ONCE(1);
4378                 goto out_fput;
4379         }
4380         return 0;
4381 out_unlock:
4382         spin_unlock(&fp->fi_lock);
4383         spin_unlock(&state_lock);
4384 out_fput:
4385         fput(filp);
4386         return status;
4387 }
4388
4389 static struct nfs4_delegation *
4390 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4391                     struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4392 {
4393         int status;
4394         struct nfs4_delegation *dp;
4395
4396         if (fp->fi_had_conflict)
4397                 return ERR_PTR(-EAGAIN);
4398
4399         spin_lock(&state_lock);
4400         spin_lock(&fp->fi_lock);
4401         status = nfs4_get_existing_delegation(clp, fp);
4402         spin_unlock(&fp->fi_lock);
4403         spin_unlock(&state_lock);
4404
4405         if (status)
4406                 return ERR_PTR(status);
4407
4408         dp = alloc_init_deleg(clp, fh, odstate);
4409         if (!dp)
4410                 return ERR_PTR(-ENOMEM);
4411
4412         get_nfs4_file(fp);
4413         spin_lock(&state_lock);
4414         spin_lock(&fp->fi_lock);
4415         dp->dl_stid.sc_file = fp;
4416         if (!fp->fi_deleg_file) {
4417                 spin_unlock(&fp->fi_lock);
4418                 spin_unlock(&state_lock);
4419                 status = nfs4_setlease(dp);
4420                 goto out;
4421         }
4422         if (fp->fi_had_conflict) {
4423                 status = -EAGAIN;
4424                 goto out_unlock;
4425         }
4426         status = hash_delegation_locked(dp, fp);
4427 out_unlock:
4428         spin_unlock(&fp->fi_lock);
4429         spin_unlock(&state_lock);
4430 out:
4431         if (status) {
4432                 put_clnt_odstate(dp->dl_clnt_odstate);
4433                 nfs4_put_stid(&dp->dl_stid);
4434                 return ERR_PTR(status);
4435         }
4436         return dp;
4437 }
4438
4439 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4440 {
4441         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4442         if (status == -EAGAIN)
4443                 open->op_why_no_deleg = WND4_CONTENTION;
4444         else {
4445                 open->op_why_no_deleg = WND4_RESOURCE;
4446                 switch (open->op_deleg_want) {
4447                 case NFS4_SHARE_WANT_READ_DELEG:
4448                 case NFS4_SHARE_WANT_WRITE_DELEG:
4449                 case NFS4_SHARE_WANT_ANY_DELEG:
4450                         break;
4451                 case NFS4_SHARE_WANT_CANCEL:
4452                         open->op_why_no_deleg = WND4_CANCELLED;
4453                         break;
4454                 case NFS4_SHARE_WANT_NO_DELEG:
4455                         WARN_ON_ONCE(1);
4456                 }
4457         }
4458 }
4459
4460 /*
4461  * Attempt to hand out a delegation.
4462  *
4463  * Note we don't support write delegations, and won't until the vfs has
4464  * proper support for them.
4465  */
4466 static void
4467 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4468                         struct nfs4_ol_stateid *stp)
4469 {
4470         struct nfs4_delegation *dp;
4471         struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4472         struct nfs4_client *clp = stp->st_stid.sc_client;
4473         int cb_up;
4474         int status = 0;
4475
4476         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4477         open->op_recall = 0;
4478         switch (open->op_claim_type) {
4479                 case NFS4_OPEN_CLAIM_PREVIOUS:
4480                         if (!cb_up)
4481                                 open->op_recall = 1;
4482                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4483                                 goto out_no_deleg;
4484                         break;
4485                 case NFS4_OPEN_CLAIM_NULL:
4486                 case NFS4_OPEN_CLAIM_FH:
4487                         /*
4488                          * Let's not give out any delegations till everyone's
4489                          * had the chance to reclaim theirs, *and* until
4490                          * NLM locks have all been reclaimed:
4491                          */
4492                         if (locks_in_grace(clp->net))
4493                                 goto out_no_deleg;
4494                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4495                                 goto out_no_deleg;
4496                         /*
4497                          * Also, if the file was opened for write or
4498                          * create, there's a good chance the client's
4499                          * about to write to it, resulting in an
4500                          * immediate recall (since we don't support
4501                          * write delegations):
4502                          */
4503                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4504                                 goto out_no_deleg;
4505                         if (open->op_create == NFS4_OPEN_CREATE)
4506                                 goto out_no_deleg;
4507                         break;
4508                 default:
4509                         goto out_no_deleg;
4510         }
4511         dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4512         if (IS_ERR(dp))
4513                 goto out_no_deleg;
4514
4515         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4516
4517         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4518                 STATEID_VAL(&dp->dl_stid.sc_stateid));
4519         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4520         nfs4_put_stid(&dp->dl_stid);
4521         return;
4522 out_no_deleg:
4523         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4524         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4525             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4526                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4527                 open->op_recall = 1;
4528         }
4529
4530         /* 4.1 client asking for a delegation? */
4531         if (open->op_deleg_want)
4532                 nfsd4_open_deleg_none_ext(open, status);
4533         return;
4534 }
4535
4536 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4537                                         struct nfs4_delegation *dp)
4538 {
4539         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4540             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4541                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4542                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4543         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4544                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4545                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4546                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4547         }
4548         /* Otherwise the client must be confused wanting a delegation
4549          * it already has, therefore we don't return
4550          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4551          */
4552 }
4553
4554 __be32
4555 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4556 {
4557         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4558         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4559         struct nfs4_file *fp = NULL;
4560         struct nfs4_ol_stateid *stp = NULL;
4561         struct nfs4_delegation *dp = NULL;
4562         __be32 status;
4563         bool new_stp = false;
4564
4565         /*
4566          * Lookup file; if found, lookup stateid and check open request,
4567          * and check for delegations in the process of being recalled.
4568          * If not found, create the nfs4_file struct
4569          */
4570         fp = find_or_add_file(open->op_file, &current_fh->fh_handle);
4571         if (fp != open->op_file) {
4572                 status = nfs4_check_deleg(cl, open, &dp);
4573                 if (status)
4574                         goto out;
4575                 stp = nfsd4_find_and_lock_existing_open(fp, open);
4576         } else {
4577                 open->op_file = NULL;
4578                 status = nfserr_bad_stateid;
4579                 if (nfsd4_is_deleg_cur(open))
4580                         goto out;
4581         }
4582
4583         if (!stp) {
4584                 stp = init_open_stateid(fp, open);
4585                 if (!open->op_stp)
4586                         new_stp = true;
4587         }
4588
4589         /*
4590          * OPEN the file, or upgrade an existing OPEN.
4591          * If truncate fails, the OPEN fails.
4592          *
4593          * stp is already locked.
4594          */
4595         if (!new_stp) {
4596                 /* Stateid was found, this is an OPEN upgrade */
4597                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4598                 if (status) {
4599                         mutex_unlock(&stp->st_mutex);
4600                         goto out;
4601                 }
4602         } else {
4603                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4604                 if (status) {
4605                         stp->st_stid.sc_type = NFS4_CLOSED_STID;
4606                         release_open_stateid(stp);
4607                         mutex_unlock(&stp->st_mutex);
4608                         goto out;
4609                 }
4610
4611                 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
4612                                                         open->op_odstate);
4613                 if (stp->st_clnt_odstate == open->op_odstate)
4614                         open->op_odstate = NULL;
4615         }
4616
4617         nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
4618         mutex_unlock(&stp->st_mutex);
4619
4620         if (nfsd4_has_session(&resp->cstate)) {
4621                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4622                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4623                         open->op_why_no_deleg = WND4_NOT_WANTED;
4624                         goto nodeleg;
4625                 }
4626         }
4627
4628         /*
4629         * Attempt to hand out a delegation. No error return, because the
4630         * OPEN succeeds even if we fail.
4631         */
4632         nfs4_open_delegation(current_fh, open, stp);
4633 nodeleg:
4634         status = nfs_ok;
4635
4636         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4637                 STATEID_VAL(&stp->st_stid.sc_stateid));
4638 out:
4639         /* 4.1 client trying to upgrade/downgrade delegation? */
4640         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4641             open->op_deleg_want)
4642                 nfsd4_deleg_xgrade_none_ext(open, dp);
4643
4644         if (fp)
4645                 put_nfs4_file(fp);
4646         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4647                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4648         /*
4649         * To finish the open response, we just need to set the rflags.
4650         */
4651         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4652         if (nfsd4_has_session(&resp->cstate))
4653                 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
4654         else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
4655                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4656
4657         if (dp)
4658                 nfs4_put_stid(&dp->dl_stid);
4659         if (stp)
4660                 nfs4_put_stid(&stp->st_stid);
4661
4662         return status;
4663 }
4664
4665 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4666                               struct nfsd4_open *open)
4667 {
4668         if (open->op_openowner) {
4669                 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4670
4671                 nfsd4_cstate_assign_replay(cstate, so);
4672                 nfs4_put_stateowner(so);
4673         }
4674         if (open->op_file)
4675                 kmem_cache_free(file_slab, open->op_file);
4676         if (open->op_stp)
4677                 nfs4_put_stid(&open->op_stp->st_stid);
4678         if (open->op_odstate)
4679                 kmem_cache_free(odstate_slab, open->op_odstate);
4680 }
4681
4682 __be32
4683 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4684             union nfsd4_op_u *u)
4685 {
4686         clientid_t *clid = &u->renew;
4687         struct nfs4_client *clp;
4688         __be32 status;
4689         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4690
4691         dprintk("process_renew(%08x/%08x): starting\n",
4692                         clid->cl_boot, clid->cl_id);
4693         status = lookup_clientid(clid, cstate, nn);
4694         if (status)
4695                 goto out;
4696         clp = cstate->clp;
4697         status = nfserr_cb_path_down;
4698         if (!list_empty(&clp->cl_delegations)
4699                         && clp->cl_cb_state != NFSD4_CB_UP)
4700                 goto out;
4701         status = nfs_ok;
4702 out:
4703         return status;
4704 }
4705
4706 void
4707 nfsd4_end_grace(struct nfsd_net *nn)
4708 {
4709         /* do nothing if grace period already ended */
4710         if (nn->grace_ended)
4711                 return;
4712
4713         dprintk("NFSD: end of grace period\n");
4714         nn->grace_ended = true;
4715         /*
4716          * If the server goes down again right now, an NFSv4
4717          * client will still be allowed to reclaim after it comes back up,
4718          * even if it hasn't yet had a chance to reclaim state this time.
4719          *
4720          */
4721         nfsd4_record_grace_done(nn);
4722         /*
4723          * At this point, NFSv4 clients can still reclaim.  But if the
4724          * server crashes, any that have not yet reclaimed will be out
4725          * of luck on the next boot.
4726          *
4727          * (NFSv4.1+ clients are considered to have reclaimed once they
4728          * call RECLAIM_COMPLETE.  NFSv4.0 clients are considered to
4729          * have reclaimed after their first OPEN.)
4730          */
4731         locks_end_grace(&nn->nfsd4_manager);
4732         /*
4733          * At this point, and once lockd and/or any other containers
4734          * exit their grace period, further reclaims will fail and
4735          * regular locking can resume.
4736          */
4737 }
4738
4739 static time_t
4740 nfs4_laundromat(struct nfsd_net *nn)
4741 {
4742         struct nfs4_client *clp;
4743         struct nfs4_openowner *oo;
4744         struct nfs4_delegation *dp;
4745         struct nfs4_ol_stateid *stp;
4746         struct nfsd4_blocked_lock *nbl;
4747         struct list_head *pos, *next, reaplist;
4748         time_t cutoff = get_seconds() - nn->nfsd4_lease;
4749         time_t t, new_timeo = nn->nfsd4_lease;
4750
4751         dprintk("NFSD: laundromat service - starting\n");
4752         nfsd4_end_grace(nn);
4753         INIT_LIST_HEAD(&reaplist);
4754         spin_lock(&nn->client_lock);
4755         list_for_each_safe(pos, next, &nn->client_lru) {
4756                 clp = list_entry(pos, struct nfs4_client, cl_lru);
4757                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4758                         t = clp->cl_time - cutoff;
4759                         new_timeo = min(new_timeo, t);
4760                         break;
4761                 }
4762                 if (mark_client_expired_locked(clp)) {
4763                         dprintk("NFSD: client in use (clientid %08x)\n",
4764                                 clp->cl_clientid.cl_id);
4765                         continue;
4766                 }
4767                 list_add(&clp->cl_lru, &reaplist);
4768         }
4769         spin_unlock(&nn->client_lock);
4770         list_for_each_safe(pos, next, &reaplist) {
4771                 clp = list_entry(pos, struct nfs4_client, cl_lru);
4772                 dprintk("NFSD: purging unused client (clientid %08x)\n",
4773                         clp->cl_clientid.cl_id);
4774                 list_del_init(&clp->cl_lru);
4775                 expire_client(clp);
4776         }
4777         spin_lock(&state_lock);
4778         list_for_each_safe(pos, next, &nn->del_recall_lru) {
4779                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4780                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4781                         t = dp->dl_time - cutoff;
4782                         new_timeo = min(new_timeo, t);
4783                         break;
4784                 }
4785                 WARN_ON(!unhash_delegation_locked(dp));
4786                 list_add(&dp->dl_recall_lru, &reaplist);
4787         }
4788         spin_unlock(&state_lock);
4789         while (!list_empty(&reaplist)) {
4790                 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4791                                         dl_recall_lru);
4792                 list_del_init(&dp->dl_recall_lru);
4793                 revoke_delegation(dp);
4794         }
4795
4796         spin_lock(&nn->client_lock);
4797         while (!list_empty(&nn->close_lru)) {
4798                 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4799                                         oo_close_lru);
4800                 if (time_after((unsigned long)oo->oo_time,
4801                                (unsigned long)cutoff)) {
4802                         t = oo->oo_time - cutoff;
4803                         new_timeo = min(new_timeo, t);
4804                         break;
4805                 }
4806                 list_del_init(&oo->oo_close_lru);
4807                 stp = oo->oo_last_closed_stid;
4808                 oo->oo_last_closed_stid = NULL;
4809                 spin_unlock(&nn->client_lock);
4810                 nfs4_put_stid(&stp->st_stid);
4811                 spin_lock(&nn->client_lock);
4812         }
4813         spin_unlock(&nn->client_lock);
4814
4815         /*
4816          * It's possible for a client to try and acquire an already held lock
4817          * that is being held for a long time, and then lose interest in it.
4818          * So, we clean out any un-revisited request after a lease period
4819          * under the assumption that the client is no longer interested.
4820          *
4821          * RFC5661, sec. 9.6 states that the client must not rely on getting
4822          * notifications and must continue to poll for locks, even when the
4823          * server supports them. Thus this shouldn't lead to clients blocking
4824          * indefinitely once the lock does become free.
4825          */
4826         BUG_ON(!list_empty(&reaplist));
4827         spin_lock(&nn->blocked_locks_lock);
4828         while (!list_empty(&nn->blocked_locks_lru)) {
4829                 nbl = list_first_entry(&nn->blocked_locks_lru,
4830                                         struct nfsd4_blocked_lock, nbl_lru);
4831                 if (time_after((unsigned long)nbl->nbl_time,
4832                                (unsigned long)cutoff)) {
4833                         t = nbl->nbl_time - cutoff;
4834                         new_timeo = min(new_timeo, t);
4835                         break;
4836                 }
4837                 list_move(&nbl->nbl_lru, &reaplist);
4838                 list_del_init(&nbl->nbl_list);
4839         }
4840         spin_unlock(&nn->blocked_locks_lock);
4841
4842         while (!list_empty(&reaplist)) {
4843                 nbl = list_first_entry(&reaplist,
4844                                         struct nfsd4_blocked_lock, nbl_lru);
4845                 list_del_init(&nbl->nbl_lru);
4846                 posix_unblock_lock(&nbl->nbl_lock);
4847                 free_blocked_lock(nbl);
4848         }
4849
4850         new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4851         return new_timeo;
4852 }
4853
4854 static struct workqueue_struct *laundry_wq;
4855 static void laundromat_main(struct work_struct *);
4856
4857 static void
4858 laundromat_main(struct work_struct *laundry)
4859 {
4860         time_t t;
4861         struct delayed_work *dwork = to_delayed_work(laundry);
4862         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4863                                            laundromat_work);
4864
4865         t = nfs4_laundromat(nn);
4866         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4867         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4868 }
4869
4870 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
4871 {
4872         if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
4873                 return nfserr_bad_stateid;
4874         return nfs_ok;
4875 }
4876
4877 static inline int
4878 access_permit_read(struct nfs4_ol_stateid *stp)
4879 {
4880         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4881                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4882                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4883 }
4884
4885 static inline int
4886 access_permit_write(struct nfs4_ol_stateid *stp)
4887 {
4888         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4889                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4890 }
4891
4892 static
4893 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4894 {
4895         __be32 status = nfserr_openmode;
4896
4897         /* For lock stateid's, we test the parent open, not the lock: */
4898         if (stp->st_openstp)
4899                 stp = stp->st_openstp;
4900         if ((flags & WR_STATE) && !access_permit_write(stp))
4901                 goto out;
4902         if ((flags & RD_STATE) && !access_permit_read(stp))
4903                 goto out;
4904         status = nfs_ok;
4905 out:
4906         return status;
4907 }
4908
4909 static inline __be32
4910 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4911 {
4912         if (ONE_STATEID(stateid) && (flags & RD_STATE))
4913                 return nfs_ok;
4914         else if (opens_in_grace(net)) {
4915                 /* Answer in remaining cases depends on existence of
4916                  * conflicting state; so we must wait out the grace period. */
4917                 return nfserr_grace;
4918         } else if (flags & WR_STATE)
4919                 return nfs4_share_conflict(current_fh,
4920                                 NFS4_SHARE_DENY_WRITE);
4921         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4922                 return nfs4_share_conflict(current_fh,
4923                                 NFS4_SHARE_DENY_READ);
4924 }
4925
4926 /*
4927  * Allow READ/WRITE during grace period on recovered state only for files
4928  * that are not able to provide mandatory locking.
4929  */
4930 static inline int
4931 grace_disallows_io(struct net *net, struct inode *inode)
4932 {
4933         return opens_in_grace(net) && mandatory_lock(inode);
4934 }
4935
4936 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4937 {
4938         /*
4939          * When sessions are used the stateid generation number is ignored
4940          * when it is zero.
4941          */
4942         if (has_session && in->si_generation == 0)
4943                 return nfs_ok;
4944
4945         if (in->si_generation == ref->si_generation)
4946                 return nfs_ok;
4947
4948         /* If the client sends us a stateid from the future, it's buggy: */
4949         if (nfsd4_stateid_generation_after(in, ref))
4950                 return nfserr_bad_stateid;
4951         /*
4952          * However, we could see a stateid from the past, even from a
4953          * non-buggy client.  For example, if the client sends a lock
4954          * while some IO is outstanding, the lock may bump si_generation
4955          * while the IO is still in flight.  The client could avoid that
4956          * situation by waiting for responses on all the IO requests,
4957          * but better performance may result in retrying IO that
4958          * receives an old_stateid error if requests are rarely
4959          * reordered in flight:
4960          */
4961         return nfserr_old_stateid;
4962 }
4963
4964 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
4965 {
4966         if (ols->st_stateowner->so_is_open_owner &&
4967             !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4968                 return nfserr_bad_stateid;
4969         return nfs_ok;
4970 }
4971
4972 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4973 {
4974         struct nfs4_stid *s;
4975         __be32 status = nfserr_bad_stateid;
4976
4977         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
4978                 CLOSE_STATEID(stateid))
4979                 return status;
4980         /* Client debugging aid. */
4981         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4982                 char addr_str[INET6_ADDRSTRLEN];
4983                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4984                                  sizeof(addr_str));
4985                 pr_warn_ratelimited("NFSD: client %s testing state ID "
4986                                         "with incorrect client ID\n", addr_str);
4987                 return status;
4988         }
4989         spin_lock(&cl->cl_lock);
4990         s = find_stateid_locked(cl, stateid);
4991         if (!s)
4992                 goto out_unlock;
4993         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
4994         if (status)
4995                 goto out_unlock;
4996         switch (s->sc_type) {
4997         case NFS4_DELEG_STID:
4998                 status = nfs_ok;
4999                 break;
5000         case NFS4_REVOKED_DELEG_STID:
5001                 status = nfserr_deleg_revoked;
5002                 break;
5003         case NFS4_OPEN_STID:
5004         case NFS4_LOCK_STID:
5005                 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
5006                 break;
5007         default:
5008                 printk("unknown stateid type %x\n", s->sc_type);
5009                 /* Fallthrough */
5010         case NFS4_CLOSED_STID:
5011         case NFS4_CLOSED_DELEG_STID:
5012                 status = nfserr_bad_stateid;
5013         }
5014 out_unlock:
5015         spin_unlock(&cl->cl_lock);
5016         return status;
5017 }
5018
5019 __be32
5020 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
5021                      stateid_t *stateid, unsigned char typemask,
5022                      struct nfs4_stid **s, struct nfsd_net *nn)
5023 {
5024         __be32 status;
5025         bool return_revoked = false;
5026
5027         /*
5028          *  only return revoked delegations if explicitly asked.
5029          *  otherwise we report revoked or bad_stateid status.
5030          */
5031         if (typemask & NFS4_REVOKED_DELEG_STID)
5032                 return_revoked = true;
5033         else if (typemask & NFS4_DELEG_STID)
5034                 typemask |= NFS4_REVOKED_DELEG_STID;
5035
5036         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5037                 CLOSE_STATEID(stateid))
5038                 return nfserr_bad_stateid;
5039         status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
5040         if (status == nfserr_stale_clientid) {
5041                 if (cstate->session)
5042                         return nfserr_bad_stateid;
5043                 return nfserr_stale_stateid;
5044         }
5045         if (status)
5046                 return status;
5047         *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5048         if (!*s)
5049                 return nfserr_bad_stateid;
5050         if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5051                 nfs4_put_stid(*s);
5052                 if (cstate->minorversion)
5053                         return nfserr_deleg_revoked;
5054                 return nfserr_bad_stateid;
5055         }
5056         return nfs_ok;
5057 }
5058
5059 static struct file *
5060 nfs4_find_file(struct nfs4_stid *s, int flags)
5061 {
5062         if (!s)
5063                 return NULL;
5064
5065         switch (s->sc_type) {
5066         case NFS4_DELEG_STID:
5067                 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5068                         return NULL;
5069                 return get_file(s->sc_file->fi_deleg_file);
5070         case NFS4_OPEN_STID:
5071         case NFS4_LOCK_STID:
5072                 if (flags & RD_STATE)
5073                         return find_readable_file(s->sc_file);
5074                 else
5075                         return find_writeable_file(s->sc_file);
5076                 break;
5077         }
5078
5079         return NULL;
5080 }
5081
5082 static __be32
5083 nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
5084 {
5085         __be32 status;
5086
5087         status = nfsd4_check_openowner_confirmed(ols);
5088         if (status)
5089                 return status;
5090         return nfs4_check_openmode(ols, flags);
5091 }
5092
5093 static __be32
5094 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5095                 struct file **filpp, bool *tmp_file, int flags)
5096 {
5097         int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5098         struct file *file;
5099         __be32 status;
5100
5101         file = nfs4_find_file(s, flags);
5102         if (file) {
5103                 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5104                                 acc | NFSD_MAY_OWNER_OVERRIDE);
5105                 if (status) {
5106                         fput(file);
5107                         return status;
5108                 }
5109
5110                 *filpp = file;
5111         } else {
5112                 status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
5113                 if (status)
5114                         return status;
5115
5116                 if (tmp_file)
5117                         *tmp_file = true;
5118         }
5119
5120         return 0;
5121 }
5122
5123 /*
5124  * Checks for stateid operations
5125  */
5126 __be32
5127 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5128                 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5129                 stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
5130 {
5131         struct inode *ino = d_inode(fhp->fh_dentry);
5132         struct net *net = SVC_NET(rqstp);
5133         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5134         struct nfs4_stid *s = NULL;
5135         __be32 status;
5136
5137         if (filpp)
5138                 *filpp = NULL;
5139         if (tmp_file)
5140                 *tmp_file = false;
5141
5142         if (grace_disallows_io(net, ino))
5143                 return nfserr_grace;
5144
5145         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5146                 status = check_special_stateids(net, fhp, stateid, flags);
5147                 goto done;
5148         }
5149
5150         status = nfsd4_lookup_stateid(cstate, stateid,
5151                                 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5152                                 &s, nn);
5153         if (status)
5154                 return status;
5155         status = check_stateid_generation(stateid, &s->sc_stateid,
5156                         nfsd4_has_session(cstate));
5157         if (status)
5158                 goto out;
5159
5160         switch (s->sc_type) {
5161         case NFS4_DELEG_STID:
5162                 status = nfs4_check_delegmode(delegstateid(s), flags);
5163                 break;
5164         case NFS4_OPEN_STID:
5165         case NFS4_LOCK_STID:
5166                 status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
5167                 break;
5168         default:
5169                 status = nfserr_bad_stateid;
5170                 break;
5171         }
5172         if (status)
5173                 goto out;
5174         status = nfs4_check_fh(fhp, s);
5175
5176 done:
5177         if (!status && filpp)
5178                 status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
5179 out:
5180         if (s)
5181                 nfs4_put_stid(s);
5182         return status;
5183 }
5184
5185 /*
5186  * Test if the stateid is valid
5187  */
5188 __be32
5189 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5190                    union nfsd4_op_u *u)
5191 {
5192         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5193         struct nfsd4_test_stateid_id *stateid;
5194         struct nfs4_client *cl = cstate->session->se_client;
5195
5196         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5197                 stateid->ts_id_status =
5198                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5199
5200         return nfs_ok;
5201 }
5202
5203 static __be32
5204 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5205 {
5206         struct nfs4_ol_stateid *stp = openlockstateid(s);
5207         __be32 ret;
5208
5209         mutex_lock(&stp->st_mutex);
5210
5211         ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5212         if (ret)
5213                 goto out;
5214
5215         ret = nfserr_locks_held;
5216         if (check_for_locks(stp->st_stid.sc_file,
5217                             lockowner(stp->st_stateowner)))
5218                 goto out;
5219
5220         release_lock_stateid(stp);
5221         ret = nfs_ok;
5222
5223 out:
5224         mutex_unlock(&stp->st_mutex);
5225         nfs4_put_stid(s);
5226         return ret;
5227 }
5228
5229 __be32
5230 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5231                    union nfsd4_op_u *u)
5232 {
5233         struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
5234         stateid_t *stateid = &free_stateid->fr_stateid;
5235         struct nfs4_stid *s;
5236         struct nfs4_delegation *dp;
5237         struct nfs4_client *cl = cstate->session->se_client;
5238         __be32 ret = nfserr_bad_stateid;
5239
5240         spin_lock(&cl->cl_lock);
5241         s = find_stateid_locked(cl, stateid);
5242         if (!s)
5243                 goto out_unlock;
5244         switch (s->sc_type) {
5245         case NFS4_DELEG_STID:
5246                 ret = nfserr_locks_held;
5247                 break;
5248         case NFS4_OPEN_STID:
5249                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5250                 if (ret)
5251                         break;
5252                 ret = nfserr_locks_held;
5253                 break;
5254         case NFS4_LOCK_STID:
5255                 atomic_inc(&s->sc_count);
5256                 spin_unlock(&cl->cl_lock);
5257                 ret = nfsd4_free_lock_stateid(stateid, s);
5258                 goto out;
5259         case NFS4_REVOKED_DELEG_STID:
5260                 dp = delegstateid(s);
5261                 list_del_init(&dp->dl_recall_lru);
5262                 spin_unlock(&cl->cl_lock);
5263                 nfs4_put_stid(s);
5264                 ret = nfs_ok;
5265                 goto out;
5266         /* Default falls through and returns nfserr_bad_stateid */
5267         }
5268 out_unlock:
5269         spin_unlock(&cl->cl_lock);
5270 out:
5271         return ret;
5272 }
5273
5274 static inline int
5275 setlkflg (int type)
5276 {
5277         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5278                 RD_STATE : WR_STATE;
5279 }
5280
5281 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5282 {
5283         struct svc_fh *current_fh = &cstate->current_fh;
5284         struct nfs4_stateowner *sop = stp->st_stateowner;
5285         __be32 status;
5286
5287         status = nfsd4_check_seqid(cstate, sop, seqid);
5288         if (status)
5289                 return status;
5290         status = nfsd4_lock_ol_stateid(stp);
5291         if (status != nfs_ok)
5292                 return status;
5293         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5294         if (status == nfs_ok)
5295                 status = nfs4_check_fh(current_fh, &stp->st_stid);
5296         if (status != nfs_ok)
5297                 mutex_unlock(&stp->st_mutex);
5298         return status;
5299 }
5300
5301 /*
5302  * Checks for sequence id mutating operations.
5303  */
5304 static __be32
5305 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5306                          stateid_t *stateid, char typemask,
5307                          struct nfs4_ol_stateid **stpp,
5308                          struct nfsd_net *nn)
5309 {
5310         __be32 status;
5311         struct nfs4_stid *s;
5312         struct nfs4_ol_stateid *stp = NULL;
5313
5314         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5315                 seqid, STATEID_VAL(stateid));
5316
5317         *stpp = NULL;
5318         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5319         if (status)
5320                 return status;
5321         stp = openlockstateid(s);
5322         nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5323
5324         status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5325         if (!status)
5326                 *stpp = stp;
5327         else
5328                 nfs4_put_stid(&stp->st_stid);
5329         return status;
5330 }
5331
5332 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5333                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5334 {
5335         __be32 status;
5336         struct nfs4_openowner *oo;
5337         struct nfs4_ol_stateid *stp;
5338
5339         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5340                                                 NFS4_OPEN_STID, &stp, nn);
5341         if (status)
5342                 return status;
5343         oo = openowner(stp->st_stateowner);
5344         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5345                 mutex_unlock(&stp->st_mutex);
5346                 nfs4_put_stid(&stp->st_stid);
5347                 return nfserr_bad_stateid;
5348         }
5349         *stpp = stp;
5350         return nfs_ok;
5351 }
5352
5353 __be32
5354 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5355                    union nfsd4_op_u *u)
5356 {
5357         struct nfsd4_open_confirm *oc = &u->open_confirm;
5358         __be32 status;
5359         struct nfs4_openowner *oo;
5360         struct nfs4_ol_stateid *stp;
5361         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5362
5363         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5364                         cstate->current_fh.fh_dentry);
5365
5366         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5367         if (status)
5368                 return status;
5369
5370         status = nfs4_preprocess_seqid_op(cstate,
5371                                         oc->oc_seqid, &oc->oc_req_stateid,
5372                                         NFS4_OPEN_STID, &stp, nn);
5373         if (status)
5374                 goto out;
5375         oo = openowner(stp->st_stateowner);
5376         status = nfserr_bad_stateid;
5377         if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5378                 mutex_unlock(&stp->st_mutex);
5379                 goto put_stateid;
5380         }
5381         oo->oo_flags |= NFS4_OO_CONFIRMED;
5382         nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5383         mutex_unlock(&stp->st_mutex);
5384         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5385                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5386
5387         nfsd4_client_record_create(oo->oo_owner.so_client);
5388         status = nfs_ok;
5389 put_stateid:
5390         nfs4_put_stid(&stp->st_stid);
5391 out:
5392         nfsd4_bump_seqid(cstate, status);
5393         return status;
5394 }
5395
5396 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5397 {
5398         if (!test_access(access, stp))
5399                 return;
5400         nfs4_file_put_access(stp->st_stid.sc_file, access);
5401         clear_access(access, stp);
5402 }
5403
5404 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5405 {
5406         switch (to_access) {
5407         case NFS4_SHARE_ACCESS_READ:
5408                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5409                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5410                 break;
5411         case NFS4_SHARE_ACCESS_WRITE:
5412                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5413                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5414                 break;
5415         case NFS4_SHARE_ACCESS_BOTH:
5416                 break;
5417         default:
5418                 WARN_ON_ONCE(1);
5419         }
5420 }
5421
5422 __be32
5423 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5424                      struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
5425 {
5426         struct nfsd4_open_downgrade *od = &u->open_downgrade;
5427         __be32 status;
5428         struct nfs4_ol_stateid *stp;
5429         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5430
5431         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5432                         cstate->current_fh.fh_dentry);
5433
5434         /* We don't yet support WANT bits: */
5435         if (od->od_deleg_want)
5436                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5437                         od->od_deleg_want);
5438
5439         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5440                                         &od->od_stateid, &stp, nn);
5441         if (status)
5442                 goto out;
5443         status = nfserr_inval;
5444         if (!test_access(od->od_share_access, stp)) {
5445                 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5446                         stp->st_access_bmap, od->od_share_access);
5447                 goto put_stateid;
5448         }
5449         if (!test_deny(od->od_share_deny, stp)) {
5450                 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5451                         stp->st_deny_bmap, od->od_share_deny);
5452                 goto put_stateid;
5453         }
5454         nfs4_stateid_downgrade(stp, od->od_share_access);
5455         reset_union_bmap_deny(od->od_share_deny, stp);
5456         nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5457         status = nfs_ok;
5458 put_stateid:
5459         mutex_unlock(&stp->st_mutex);
5460         nfs4_put_stid(&stp->st_stid);
5461 out:
5462         nfsd4_bump_seqid(cstate, status);
5463         return status;
5464 }
5465
5466 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5467 {
5468         struct nfs4_client *clp = s->st_stid.sc_client;
5469         bool unhashed;
5470         LIST_HEAD(reaplist);
5471
5472         spin_lock(&clp->cl_lock);
5473         unhashed = unhash_open_stateid(s, &reaplist);
5474
5475         if (clp->cl_minorversion) {
5476                 if (unhashed)
5477                         put_ol_stateid_locked(s, &reaplist);
5478                 spin_unlock(&clp->cl_lock);
5479                 free_ol_stateid_reaplist(&reaplist);
5480         } else {
5481                 spin_unlock(&clp->cl_lock);
5482                 free_ol_stateid_reaplist(&reaplist);
5483                 if (unhashed)
5484                         move_to_close_lru(s, clp->net);
5485         }
5486 }
5487
5488 /*
5489  * nfs4_unlock_state() called after encode
5490  */
5491 __be32
5492 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5493                 union nfsd4_op_u *u)
5494 {
5495         struct nfsd4_close *close = &u->close;
5496         __be32 status;
5497         struct nfs4_ol_stateid *stp;
5498         struct net *net = SVC_NET(rqstp);
5499         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5500
5501         dprintk("NFSD: nfsd4_close on file %pd\n",
5502                         cstate->current_fh.fh_dentry);
5503
5504         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5505                                         &close->cl_stateid,
5506                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
5507                                         &stp, nn);
5508         nfsd4_bump_seqid(cstate, status);
5509         if (status)
5510                 goto out;
5511
5512         stp->st_stid.sc_type = NFS4_CLOSED_STID;
5513         nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
5514
5515         nfsd4_close_open_stateid(stp);
5516         mutex_unlock(&stp->st_mutex);
5517
5518         /* See RFC5661 sectionm 18.2.4 */
5519         if (stp->st_stid.sc_client->cl_minorversion)
5520                 memcpy(&close->cl_stateid, &close_stateid,
5521                                 sizeof(close->cl_stateid));
5522
5523         /* put reference from nfs4_preprocess_seqid_op */
5524         nfs4_put_stid(&stp->st_stid);
5525 out:
5526         return status;
5527 }
5528
5529 __be32
5530 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5531                   union nfsd4_op_u *u)
5532 {
5533         struct nfsd4_delegreturn *dr = &u->delegreturn;
5534         struct nfs4_delegation *dp;
5535         stateid_t *stateid = &dr->dr_stateid;
5536         struct nfs4_stid *s;
5537         __be32 status;
5538         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5539
5540         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5541                 return status;
5542
5543         status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
5544         if (status)
5545                 goto out;
5546         dp = delegstateid(s);
5547         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
5548         if (status)
5549                 goto put_stateid;
5550
5551         destroy_delegation(dp);
5552 put_stateid:
5553         nfs4_put_stid(&dp->dl_stid);
5554 out:
5555         return status;
5556 }
5557
5558 static inline u64
5559 end_offset(u64 start, u64 len)
5560 {
5561         u64 end;
5562
5563         end = start + len;
5564         return end >= start ? end: NFS4_MAX_UINT64;
5565 }
5566
5567 /* last octet in a range */
5568 static inline u64
5569 last_byte_offset(u64 start, u64 len)
5570 {
5571         u64 end;
5572
5573         WARN_ON_ONCE(!len);
5574         end = start + len;
5575         return end > start ? end - 1: NFS4_MAX_UINT64;
5576 }
5577
5578 /*
5579  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5580  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5581  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
5582  * locking, this prevents us from being completely protocol-compliant.  The
5583  * real solution to this problem is to start using unsigned file offsets in
5584  * the VFS, but this is a very deep change!
5585  */
5586 static inline void
5587 nfs4_transform_lock_offset(struct file_lock *lock)
5588 {
5589         if (lock->fl_start < 0)
5590                 lock->fl_start = OFFSET_MAX;
5591         if (lock->fl_end < 0)
5592                 lock->fl_end = OFFSET_MAX;
5593 }
5594
5595 static fl_owner_t
5596 nfsd4_fl_get_owner(fl_owner_t owner)
5597 {
5598         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5599
5600         nfs4_get_stateowner(&lo->lo_owner);
5601         return owner;
5602 }
5603
5604 static void
5605 nfsd4_fl_put_owner(fl_owner_t owner)
5606 {
5607         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5608
5609         if (lo)
5610                 nfs4_put_stateowner(&lo->lo_owner);
5611 }
5612
5613 static void
5614 nfsd4_lm_notify(struct file_lock *fl)
5615 {
5616         struct nfs4_lockowner           *lo = (struct nfs4_lockowner *)fl->fl_owner;
5617         struct net                      *net = lo->lo_owner.so_client->net;
5618         struct nfsd_net                 *nn = net_generic(net, nfsd_net_id);
5619         struct nfsd4_blocked_lock       *nbl = container_of(fl,
5620                                                 struct nfsd4_blocked_lock, nbl_lock);
5621         bool queue = false;
5622
5623         /* An empty list means that something else is going to be using it */
5624         spin_lock(&nn->blocked_locks_lock);
5625         if (!list_empty(&nbl->nbl_list)) {
5626                 list_del_init(&nbl->nbl_list);
5627                 list_del_init(&nbl->nbl_lru);
5628                 queue = true;
5629         }
5630         spin_unlock(&nn->blocked_locks_lock);
5631
5632         if (queue)
5633                 nfsd4_run_cb(&nbl->nbl_cb);
5634 }
5635
5636 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
5637         .lm_notify = nfsd4_lm_notify,
5638         .lm_get_owner = nfsd4_fl_get_owner,
5639         .lm_put_owner = nfsd4_fl_put_owner,
5640 };
5641
5642 static inline void
5643 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
5644 {
5645         struct nfs4_lockowner *lo;
5646
5647         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
5648                 lo = (struct nfs4_lockowner *) fl->fl_owner;
5649                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
5650                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
5651                 if (!deny->ld_owner.data)
5652                         /* We just don't care that much */
5653                         goto nevermind;
5654                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
5655                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
5656         } else {
5657 nevermind:
5658                 deny->ld_owner.len = 0;
5659                 deny->ld_owner.data = NULL;
5660                 deny->ld_clientid.cl_boot = 0;
5661                 deny->ld_clientid.cl_id = 0;
5662         }
5663         deny->ld_start = fl->fl_start;
5664         deny->ld_length = NFS4_MAX_UINT64;
5665         if (fl->fl_end != NFS4_MAX_UINT64)
5666                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
5667         deny->ld_type = NFS4_READ_LT;
5668         if (fl->fl_type != F_RDLCK)
5669                 deny->ld_type = NFS4_WRITE_LT;
5670 }
5671
5672 static struct nfs4_lockowner *
5673 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
5674 {
5675         unsigned int strhashval = ownerstr_hashval(owner);
5676         struct nfs4_stateowner *so;
5677
5678         lockdep_assert_held(&clp->cl_lock);
5679
5680         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
5681                             so_strhash) {
5682                 if (so->so_is_open_owner)
5683                         continue;
5684                 if (same_owner_str(so, owner))
5685                         return lockowner(nfs4_get_stateowner(so));
5686         }
5687         return NULL;
5688 }
5689
5690 static struct nfs4_lockowner *
5691 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
5692 {
5693         struct nfs4_lockowner *lo;
5694
5695         spin_lock(&clp->cl_lock);
5696         lo = find_lockowner_str_locked(clp, owner);
5697         spin_unlock(&clp->cl_lock);
5698         return lo;
5699 }
5700
5701 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
5702 {
5703         unhash_lockowner_locked(lockowner(sop));
5704 }
5705
5706 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
5707 {
5708         struct nfs4_lockowner *lo = lockowner(sop);
5709
5710         kmem_cache_free(lockowner_slab, lo);
5711 }
5712
5713 static const struct nfs4_stateowner_operations lockowner_ops = {
5714         .so_unhash =    nfs4_unhash_lockowner,
5715         .so_free =      nfs4_free_lockowner,
5716 };
5717
5718 /*
5719  * Alloc a lock owner structure.
5720  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5721  * occurred.
5722  *
5723  * strhashval = ownerstr_hashval
5724  */
5725 static struct nfs4_lockowner *
5726 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5727                            struct nfs4_ol_stateid *open_stp,
5728                            struct nfsd4_lock *lock)
5729 {
5730         struct nfs4_lockowner *lo, *ret;
5731
5732         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5733         if (!lo)
5734                 return NULL;
5735         INIT_LIST_HEAD(&lo->lo_blocked);
5736         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5737         lo->lo_owner.so_is_open_owner = 0;
5738         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5739         lo->lo_owner.so_ops = &lockowner_ops;
5740         spin_lock(&clp->cl_lock);
5741         ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
5742         if (ret == NULL) {
5743                 list_add(&lo->lo_owner.so_strhash,
5744                          &clp->cl_ownerstr_hashtbl[strhashval]);
5745                 ret = lo;
5746         } else
5747                 nfs4_free_stateowner(&lo->lo_owner);
5748
5749         spin_unlock(&clp->cl_lock);
5750         return ret;
5751 }
5752
5753 static void
5754 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5755                   struct nfs4_file *fp, struct inode *inode,
5756                   struct nfs4_ol_stateid *open_stp)
5757 {
5758         struct nfs4_client *clp = lo->lo_owner.so_client;
5759
5760         lockdep_assert_held(&clp->cl_lock);
5761
5762         atomic_inc(&stp->st_stid.sc_count);
5763         stp->st_stid.sc_type = NFS4_LOCK_STID;
5764         stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
5765         get_nfs4_file(fp);
5766         stp->st_stid.sc_file = fp;
5767         stp->st_access_bmap = 0;
5768         stp->st_deny_bmap = open_stp->st_deny_bmap;
5769         stp->st_openstp = open_stp;
5770         mutex_init(&stp->st_mutex);
5771         list_add(&stp->st_locks, &open_stp->st_locks);
5772         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5773         spin_lock(&fp->fi_lock);
5774         list_add(&stp->st_perfile, &fp->fi_stateids);
5775         spin_unlock(&fp->fi_lock);
5776 }
5777
5778 static struct nfs4_ol_stateid *
5779 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5780 {
5781         struct nfs4_ol_stateid *lst;
5782         struct nfs4_client *clp = lo->lo_owner.so_client;
5783
5784         lockdep_assert_held(&clp->cl_lock);
5785
5786         list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5787                 if (lst->st_stid.sc_file == fp) {
5788                         atomic_inc(&lst->st_stid.sc_count);
5789                         return lst;
5790                 }
5791         }
5792         return NULL;
5793 }
5794
5795 static struct nfs4_ol_stateid *
5796 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5797                             struct inode *inode, struct nfs4_ol_stateid *ost,
5798                             bool *new)
5799 {
5800         struct nfs4_stid *ns = NULL;
5801         struct nfs4_ol_stateid *lst;
5802         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5803         struct nfs4_client *clp = oo->oo_owner.so_client;
5804
5805         spin_lock(&clp->cl_lock);
5806         lst = find_lock_stateid(lo, fi);
5807         if (lst == NULL) {
5808                 spin_unlock(&clp->cl_lock);
5809                 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
5810                 if (ns == NULL)
5811                         return NULL;
5812
5813                 spin_lock(&clp->cl_lock);
5814                 lst = find_lock_stateid(lo, fi);
5815                 if (likely(!lst)) {
5816                         lst = openlockstateid(ns);
5817                         init_lock_stateid(lst, lo, fi, inode, ost);
5818                         ns = NULL;
5819                         *new = true;
5820                 }
5821         }
5822         spin_unlock(&clp->cl_lock);
5823         if (ns)
5824                 nfs4_put_stid(ns);
5825         return lst;
5826 }
5827
5828 static int
5829 check_lock_length(u64 offset, u64 length)
5830 {
5831         return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5832                 (length > ~offset)));
5833 }
5834
5835 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5836 {
5837         struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5838
5839         lockdep_assert_held(&fp->fi_lock);
5840
5841         if (test_access(access, lock_stp))
5842                 return;
5843         __nfs4_file_get_access(fp, access);
5844         set_access(access, lock_stp);
5845 }
5846
5847 static __be32
5848 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5849                             struct nfs4_ol_stateid *ost,
5850                             struct nfsd4_lock *lock,
5851                             struct nfs4_ol_stateid **plst, bool *new)
5852 {
5853         __be32 status;
5854         struct nfs4_file *fi = ost->st_stid.sc_file;
5855         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5856         struct nfs4_client *cl = oo->oo_owner.so_client;
5857         struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
5858         struct nfs4_lockowner *lo;
5859         struct nfs4_ol_stateid *lst;
5860         unsigned int strhashval;
5861         bool hashed;
5862
5863         lo = find_lockowner_str(cl, &lock->lk_new_owner);
5864         if (!lo) {
5865                 strhashval = ownerstr_hashval(&lock->lk_new_owner);
5866                 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5867                 if (lo == NULL)
5868                         return nfserr_jukebox;
5869         } else {
5870                 /* with an existing lockowner, seqids must be the same */
5871                 status = nfserr_bad_seqid;
5872                 if (!cstate->minorversion &&
5873                     lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5874                         goto out;
5875         }
5876
5877 retry:
5878         lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5879         if (lst == NULL) {
5880                 status = nfserr_jukebox;
5881                 goto out;
5882         }
5883
5884         mutex_lock(&lst->st_mutex);
5885
5886         /* See if it's still hashed to avoid race with FREE_STATEID */
5887         spin_lock(&cl->cl_lock);
5888         hashed = !list_empty(&lst->st_perfile);
5889         spin_unlock(&cl->cl_lock);
5890
5891         if (!hashed) {
5892                 mutex_unlock(&lst->st_mutex);
5893                 nfs4_put_stid(&lst->st_stid);
5894                 goto retry;
5895         }
5896         status = nfs_ok;
5897         *plst = lst;
5898 out:
5899         nfs4_put_stateowner(&lo->lo_owner);
5900         return status;
5901 }
5902
5903 /*
5904  *  LOCK operation
5905  */
5906 __be32
5907 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5908            union nfsd4_op_u *u)
5909 {
5910         struct nfsd4_lock *lock = &u->lock;
5911         struct nfs4_openowner *open_sop = NULL;
5912         struct nfs4_lockowner *lock_sop = NULL;
5913         struct nfs4_ol_stateid *lock_stp = NULL;
5914         struct nfs4_ol_stateid *open_stp = NULL;
5915         struct nfs4_file *fp;
5916         struct file *filp = NULL;
5917         struct nfsd4_blocked_lock *nbl = NULL;
5918         struct file_lock *file_lock = NULL;
5919         struct file_lock *conflock = NULL;
5920         __be32 status = 0;
5921         int lkflg;
5922         int err;
5923         bool new = false;
5924         unsigned char fl_type;
5925         unsigned int fl_flags = FL_POSIX;
5926         struct net *net = SVC_NET(rqstp);
5927         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5928
5929         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5930                 (long long) lock->lk_offset,
5931                 (long long) lock->lk_length);
5932
5933         if (check_lock_length(lock->lk_offset, lock->lk_length))
5934                  return nfserr_inval;
5935
5936         if ((status = fh_verify(rqstp, &cstate->current_fh,
5937                                 S_IFREG, NFSD_MAY_LOCK))) {
5938                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5939                 return status;
5940         }
5941
5942         if (lock->lk_is_new) {
5943                 if (nfsd4_has_session(cstate))
5944                         /* See rfc 5661 18.10.3: given clientid is ignored: */
5945                         memcpy(&lock->lk_new_clientid,
5946                                 &cstate->session->se_client->cl_clientid,
5947                                 sizeof(clientid_t));
5948
5949                 status = nfserr_stale_clientid;
5950                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5951                         goto out;
5952
5953                 /* validate and update open stateid and open seqid */
5954                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5955                                         lock->lk_new_open_seqid,
5956                                         &lock->lk_new_open_stateid,
5957                                         &open_stp, nn);
5958                 if (status)
5959                         goto out;
5960                 mutex_unlock(&open_stp->st_mutex);
5961                 open_sop = openowner(open_stp->st_stateowner);
5962                 status = nfserr_bad_stateid;
5963                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5964                                                 &lock->lk_new_clientid))
5965                         goto out;
5966                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5967                                                         &lock_stp, &new);
5968         } else {
5969                 status = nfs4_preprocess_seqid_op(cstate,
5970                                        lock->lk_old_lock_seqid,
5971                                        &lock->lk_old_lock_stateid,
5972                                        NFS4_LOCK_STID, &lock_stp, nn);
5973         }
5974         if (status)
5975                 goto out;
5976         lock_sop = lockowner(lock_stp->st_stateowner);
5977
5978         lkflg = setlkflg(lock->lk_type);
5979         status = nfs4_check_openmode(lock_stp, lkflg);
5980         if (status)
5981                 goto out;
5982
5983         status = nfserr_grace;
5984         if (locks_in_grace(net) && !lock->lk_reclaim)
5985                 goto out;
5986         status = nfserr_no_grace;
5987         if (!locks_in_grace(net) && lock->lk_reclaim)
5988                 goto out;
5989
5990         fp = lock_stp->st_stid.sc_file;
5991         switch (lock->lk_type) {
5992                 case NFS4_READW_LT:
5993                         if (nfsd4_has_session(cstate))
5994                                 fl_flags |= FL_SLEEP;
5995                         /* Fallthrough */
5996                 case NFS4_READ_LT:
5997                         spin_lock(&fp->fi_lock);
5998                         filp = find_readable_file_locked(fp);
5999                         if (filp)
6000                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
6001                         spin_unlock(&fp->fi_lock);
6002                         fl_type = F_RDLCK;
6003                         break;
6004                 case NFS4_WRITEW_LT:
6005                         if (nfsd4_has_session(cstate))
6006                                 fl_flags |= FL_SLEEP;
6007                         /* Fallthrough */
6008                 case NFS4_WRITE_LT:
6009                         spin_lock(&fp->fi_lock);
6010                         filp = find_writeable_file_locked(fp);
6011                         if (filp)
6012                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
6013                         spin_unlock(&fp->fi_lock);
6014                         fl_type = F_WRLCK;
6015                         break;
6016                 default:
6017                         status = nfserr_inval;
6018                 goto out;
6019         }
6020
6021         if (!filp) {
6022                 status = nfserr_openmode;
6023                 goto out;
6024         }
6025
6026         nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6027         if (!nbl) {
6028                 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6029                 status = nfserr_jukebox;
6030                 goto out;
6031         }
6032
6033         file_lock = &nbl->nbl_lock;
6034         file_lock->fl_type = fl_type;
6035         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6036         file_lock->fl_pid = current->tgid;
6037         file_lock->fl_file = filp;
6038         file_lock->fl_flags = fl_flags;
6039         file_lock->fl_lmops = &nfsd_posix_mng_ops;
6040         file_lock->fl_start = lock->lk_offset;
6041         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6042         nfs4_transform_lock_offset(file_lock);
6043
6044         conflock = locks_alloc_lock();
6045         if (!conflock) {
6046                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6047                 status = nfserr_jukebox;
6048                 goto out;
6049         }
6050
6051         if (fl_flags & FL_SLEEP) {
6052                 nbl->nbl_time = get_seconds();
6053                 spin_lock(&nn->blocked_locks_lock);
6054                 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6055                 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6056                 spin_unlock(&nn->blocked_locks_lock);
6057         }
6058
6059         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
6060         switch (err) {
6061         case 0: /* success! */
6062                 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6063                 status = 0;
6064                 break;
6065         case FILE_LOCK_DEFERRED:
6066                 nbl = NULL;
6067                 /* Fallthrough */
6068         case -EAGAIN:           /* conflock holds conflicting lock */
6069                 status = nfserr_denied;
6070                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6071                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6072                 break;
6073         case -EDEADLK:
6074                 status = nfserr_deadlock;
6075                 break;
6076         default:
6077                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6078                 status = nfserrno(err);
6079                 break;
6080         }
6081 out:
6082         if (nbl) {
6083                 /* dequeue it if we queued it before */
6084                 if (fl_flags & FL_SLEEP) {
6085                         spin_lock(&nn->blocked_locks_lock);
6086                         list_del_init(&nbl->nbl_list);
6087                         list_del_init(&nbl->nbl_lru);
6088                         spin_unlock(&nn->blocked_locks_lock);
6089                 }
6090                 free_blocked_lock(nbl);
6091         }
6092         if (filp)
6093                 fput(filp);
6094         if (lock_stp) {
6095                 /* Bump seqid manually if the 4.0 replay owner is openowner */
6096                 if (cstate->replay_owner &&
6097                     cstate->replay_owner != &lock_sop->lo_owner &&
6098                     seqid_mutating_err(ntohl(status)))
6099                         lock_sop->lo_owner.so_seqid++;
6100
6101                 mutex_unlock(&lock_stp->st_mutex);
6102
6103                 /*
6104                  * If this is a new, never-before-used stateid, and we are
6105                  * returning an error, then just go ahead and release it.
6106                  */
6107                 if (status && new)
6108                         release_lock_stateid(lock_stp);
6109
6110                 nfs4_put_stid(&lock_stp->st_stid);
6111         }
6112         if (open_stp)
6113                 nfs4_put_stid(&open_stp->st_stid);
6114         nfsd4_bump_seqid(cstate, status);
6115         if (conflock)
6116                 locks_free_lock(conflock);
6117         return status;
6118 }
6119
6120 /*
6121  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6122  * so we do a temporary open here just to get an open file to pass to
6123  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
6124  * inode operation.)
6125  */
6126 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6127 {
6128         struct file *file;
6129         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
6130         if (!err) {
6131                 err = nfserrno(vfs_test_lock(file, lock));
6132                 fput(file);
6133         }
6134         return err;
6135 }
6136
6137 /*
6138  * LOCKT operation
6139  */
6140 __be32
6141 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6142             union nfsd4_op_u *u)
6143 {
6144         struct nfsd4_lockt *lockt = &u->lockt;
6145         struct file_lock *file_lock = NULL;
6146         struct nfs4_lockowner *lo = NULL;
6147         __be32 status;
6148         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6149
6150         if (locks_in_grace(SVC_NET(rqstp)))
6151                 return nfserr_grace;
6152
6153         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6154                  return nfserr_inval;
6155
6156         if (!nfsd4_has_session(cstate)) {
6157                 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
6158                 if (status)
6159                         goto out;
6160         }
6161
6162         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6163                 goto out;
6164
6165         file_lock = locks_alloc_lock();
6166         if (!file_lock) {
6167                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6168                 status = nfserr_jukebox;
6169                 goto out;
6170         }
6171
6172         switch (lockt->lt_type) {
6173                 case NFS4_READ_LT:
6174                 case NFS4_READW_LT:
6175                         file_lock->fl_type = F_RDLCK;
6176                 break;
6177                 case NFS4_WRITE_LT:
6178                 case NFS4_WRITEW_LT:
6179                         file_lock->fl_type = F_WRLCK;
6180                 break;
6181                 default:
6182                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6183                         status = nfserr_inval;
6184                 goto out;
6185         }
6186
6187         lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6188         if (lo)
6189                 file_lock->fl_owner = (fl_owner_t)lo;
6190         file_lock->fl_pid = current->tgid;
6191         file_lock->fl_flags = FL_POSIX;
6192
6193         file_lock->fl_start = lockt->lt_offset;
6194         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6195
6196         nfs4_transform_lock_offset(file_lock);
6197
6198         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6199         if (status)
6200                 goto out;
6201
6202         if (file_lock->fl_type != F_UNLCK) {
6203                 status = nfserr_denied;
6204                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6205         }
6206 out:
6207         if (lo)
6208                 nfs4_put_stateowner(&lo->lo_owner);
6209         if (file_lock)
6210                 locks_free_lock(file_lock);
6211         return status;
6212 }
6213
6214 __be32
6215 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6216             union nfsd4_op_u *u)
6217 {
6218         struct nfsd4_locku *locku = &u->locku;
6219         struct nfs4_ol_stateid *stp;
6220         struct file *filp = NULL;
6221         struct file_lock *file_lock = NULL;
6222         __be32 status;
6223         int err;
6224         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6225
6226         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6227                 (long long) locku->lu_offset,
6228                 (long long) locku->lu_length);
6229
6230         if (check_lock_length(locku->lu_offset, locku->lu_length))
6231                  return nfserr_inval;
6232
6233         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6234                                         &locku->lu_stateid, NFS4_LOCK_STID,
6235                                         &stp, nn);
6236         if (status)
6237                 goto out;
6238         filp = find_any_file(stp->st_stid.sc_file);
6239         if (!filp) {
6240                 status = nfserr_lock_range;
6241                 goto put_stateid;
6242         }
6243         file_lock = locks_alloc_lock();
6244         if (!file_lock) {
6245                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6246                 status = nfserr_jukebox;
6247                 goto fput;
6248         }
6249
6250         file_lock->fl_type = F_UNLCK;
6251         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6252         file_lock->fl_pid = current->tgid;
6253         file_lock->fl_file = filp;
6254         file_lock->fl_flags = FL_POSIX;
6255         file_lock->fl_lmops = &nfsd_posix_mng_ops;
6256         file_lock->fl_start = locku->lu_offset;
6257
6258         file_lock->fl_end = last_byte_offset(locku->lu_offset,
6259                                                 locku->lu_length);
6260         nfs4_transform_lock_offset(file_lock);
6261
6262         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
6263         if (err) {
6264                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6265                 goto out_nfserr;
6266         }
6267         nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6268 fput:
6269         fput(filp);
6270 put_stateid:
6271         mutex_unlock(&stp->st_mutex);
6272         nfs4_put_stid(&stp->st_stid);
6273 out:
6274         nfsd4_bump_seqid(cstate, status);
6275         if (file_lock)
6276                 locks_free_lock(file_lock);
6277         return status;
6278
6279 out_nfserr:
6280         status = nfserrno(err);
6281         goto fput;
6282 }
6283
6284 /*
6285  * returns
6286  *      true:  locks held by lockowner
6287  *      false: no locks held by lockowner
6288  */
6289 static bool
6290 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6291 {
6292         struct file_lock *fl;
6293         int status = false;
6294         struct file *filp = find_any_file(fp);
6295         struct inode *inode;
6296         struct file_lock_context *flctx;
6297
6298         if (!filp) {
6299                 /* Any valid lock stateid should have some sort of access */
6300                 WARN_ON_ONCE(1);
6301                 return status;
6302         }
6303
6304         inode = file_inode(filp);
6305         flctx = inode->i_flctx;
6306
6307         if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6308                 spin_lock(&flctx->flc_lock);
6309                 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6310                         if (fl->fl_owner == (fl_owner_t)lowner) {
6311                                 status = true;
6312                                 break;
6313                         }
6314                 }
6315                 spin_unlock(&flctx->flc_lock);
6316         }
6317         fput(filp);
6318         return status;
6319 }
6320
6321 __be32
6322 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6323                         struct nfsd4_compound_state *cstate,
6324                         union nfsd4_op_u *u)
6325 {
6326         struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
6327         clientid_t *clid = &rlockowner->rl_clientid;
6328         struct nfs4_stateowner *sop;
6329         struct nfs4_lockowner *lo = NULL;
6330         struct nfs4_ol_stateid *stp;
6331         struct xdr_netobj *owner = &rlockowner->rl_owner;
6332         unsigned int hashval = ownerstr_hashval(owner);
6333         __be32 status;
6334         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6335         struct nfs4_client *clp;
6336         LIST_HEAD (reaplist);
6337
6338         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6339                 clid->cl_boot, clid->cl_id);
6340
6341         status = lookup_clientid(clid, cstate, nn);
6342         if (status)
6343                 return status;
6344
6345         clp = cstate->clp;
6346         /* Find the matching lock stateowner */
6347         spin_lock(&clp->cl_lock);
6348         list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
6349                             so_strhash) {
6350
6351                 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
6352                         continue;
6353
6354                 /* see if there are still any locks associated with it */
6355                 lo = lockowner(sop);
6356                 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
6357                         if (check_for_locks(stp->st_stid.sc_file, lo)) {
6358                                 status = nfserr_locks_held;
6359                                 spin_unlock(&clp->cl_lock);
6360                                 return status;
6361                         }
6362                 }
6363
6364                 nfs4_get_stateowner(sop);
6365                 break;
6366         }
6367         if (!lo) {
6368                 spin_unlock(&clp->cl_lock);
6369                 return status;
6370         }
6371
6372         unhash_lockowner_locked(lo);
6373         while (!list_empty(&lo->lo_owner.so_stateids)) {
6374                 stp = list_first_entry(&lo->lo_owner.so_stateids,
6375                                        struct nfs4_ol_stateid,
6376                                        st_perstateowner);
6377                 WARN_ON(!unhash_lock_stateid(stp));
6378                 put_ol_stateid_locked(stp, &reaplist);
6379         }
6380         spin_unlock(&clp->cl_lock);
6381         free_ol_stateid_reaplist(&reaplist);
6382         remove_blocked_locks(lo);
6383         nfs4_put_stateowner(&lo->lo_owner);
6384
6385         return status;
6386 }
6387
6388 static inline struct nfs4_client_reclaim *
6389 alloc_reclaim(void)
6390 {
6391         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
6392 }
6393
6394 bool
6395 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
6396 {
6397         struct nfs4_client_reclaim *crp;
6398
6399         crp = nfsd4_find_reclaim_client(name, nn);
6400         return (crp && crp->cr_clp);
6401 }
6402
6403 /*
6404  * failure => all reset bets are off, nfserr_no_grace...
6405  */
6406 struct nfs4_client_reclaim *
6407 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
6408 {
6409         unsigned int strhashval;
6410         struct nfs4_client_reclaim *crp;
6411
6412         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
6413         crp = alloc_reclaim();
6414         if (crp) {
6415                 strhashval = clientstr_hashval(name);
6416                 INIT_LIST_HEAD(&crp->cr_strhash);
6417                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
6418                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
6419                 crp->cr_clp = NULL;
6420                 nn->reclaim_str_hashtbl_size++;
6421         }
6422         return crp;
6423 }
6424
6425 void
6426 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
6427 {
6428         list_del(&crp->cr_strhash);
6429         kfree(crp);
6430         nn->reclaim_str_hashtbl_size--;
6431 }
6432
6433 void
6434 nfs4_release_reclaim(struct nfsd_net *nn)
6435 {
6436         struct nfs4_client_reclaim *crp = NULL;
6437         int i;
6438
6439         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6440                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6441                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6442                                         struct nfs4_client_reclaim, cr_strhash);
6443                         nfs4_remove_reclaim_record(crp, nn);
6444                 }
6445         }
6446         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6447 }
6448
6449 /*
6450  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6451 struct nfs4_client_reclaim *
6452 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
6453 {
6454         unsigned int strhashval;
6455         struct nfs4_client_reclaim *crp = NULL;
6456
6457         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
6458
6459         strhashval = clientstr_hashval(recdir);
6460         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6461                 if (same_name(crp->cr_recdir, recdir)) {
6462                         return crp;
6463                 }
6464         }
6465         return NULL;
6466 }
6467
6468 /*
6469 * Called from OPEN. Look for clientid in reclaim list.
6470 */
6471 __be32
6472 nfs4_check_open_reclaim(clientid_t *clid,
6473                 struct nfsd4_compound_state *cstate,
6474                 struct nfsd_net *nn)
6475 {
6476         __be32 status;
6477
6478         /* find clientid in conf_id_hashtbl */
6479         status = lookup_clientid(clid, cstate, nn);
6480         if (status)
6481                 return nfserr_reclaim_bad;
6482
6483         if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6484                 return nfserr_no_grace;
6485
6486         if (nfsd4_client_record_check(cstate->clp))
6487                 return nfserr_reclaim_bad;
6488
6489         return nfs_ok;
6490 }
6491
6492 #ifdef CONFIG_NFSD_FAULT_INJECTION
6493 static inline void
6494 put_client(struct nfs4_client *clp)
6495 {
6496         atomic_dec(&clp->cl_refcount);
6497 }
6498
6499 static struct nfs4_client *
6500 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
6501 {
6502         struct nfs4_client *clp;
6503         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6504                                           nfsd_net_id);
6505
6506         if (!nfsd_netns_ready(nn))
6507                 return NULL;
6508
6509         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6510                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
6511                         return clp;
6512         }
6513         return NULL;
6514 }
6515
6516 u64
6517 nfsd_inject_print_clients(void)
6518 {
6519         struct nfs4_client *clp;
6520         u64 count = 0;
6521         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6522                                           nfsd_net_id);
6523         char buf[INET6_ADDRSTRLEN];
6524
6525         if (!nfsd_netns_ready(nn))
6526                 return 0;
6527
6528         spin_lock(&nn->client_lock);
6529         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6530                 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6531                 pr_info("NFS Client: %s\n", buf);
6532                 ++count;
6533         }
6534         spin_unlock(&nn->client_lock);
6535
6536         return count;
6537 }
6538
6539 u64
6540 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
6541 {
6542         u64 count = 0;
6543         struct nfs4_client *clp;
6544         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6545                                           nfsd_net_id);
6546
6547         if (!nfsd_netns_ready(nn))
6548                 return count;
6549
6550         spin_lock(&nn->client_lock);
6551         clp = nfsd_find_client(addr, addr_size);
6552         if (clp) {
6553                 if (mark_client_expired_locked(clp) == nfs_ok)
6554                         ++count;
6555                 else
6556                         clp = NULL;
6557         }
6558         spin_unlock(&nn->client_lock);
6559
6560         if (clp)
6561                 expire_client(clp);
6562
6563         return count;
6564 }
6565
6566 u64
6567 nfsd_inject_forget_clients(u64 max)
6568 {
6569         u64 count = 0;
6570         struct nfs4_client *clp, *next;
6571         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6572                                                 nfsd_net_id);
6573         LIST_HEAD(reaplist);
6574
6575         if (!nfsd_netns_ready(nn))
6576                 return count;
6577
6578         spin_lock(&nn->client_lock);
6579         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6580                 if (mark_client_expired_locked(clp) == nfs_ok) {
6581                         list_add(&clp->cl_lru, &reaplist);
6582                         if (max != 0 && ++count >= max)
6583                                 break;
6584                 }
6585         }
6586         spin_unlock(&nn->client_lock);
6587
6588         list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
6589                 expire_client(clp);
6590
6591         return count;
6592 }
6593
6594 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
6595                              const char *type)
6596 {
6597         char buf[INET6_ADDRSTRLEN];
6598         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6599         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
6600 }
6601
6602 static void
6603 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
6604                              struct list_head *collect)
6605 {
6606         struct nfs4_client *clp = lst->st_stid.sc_client;
6607         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6608                                           nfsd_net_id);
6609
6610         if (!collect)
6611                 return;
6612
6613         lockdep_assert_held(&nn->client_lock);
6614         atomic_inc(&clp->cl_refcount);
6615         list_add(&lst->st_locks, collect);
6616 }
6617
6618 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
6619                                     struct list_head *collect,
6620                                     bool (*func)(struct nfs4_ol_stateid *))
6621 {
6622         struct nfs4_openowner *oop;
6623         struct nfs4_ol_stateid *stp, *st_next;
6624         struct nfs4_ol_stateid *lst, *lst_next;
6625         u64 count = 0;
6626
6627         spin_lock(&clp->cl_lock);
6628         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
6629                 list_for_each_entry_safe(stp, st_next,
6630                                 &oop->oo_owner.so_stateids, st_perstateowner) {
6631                         list_for_each_entry_safe(lst, lst_next,
6632                                         &stp->st_locks, st_locks) {
6633                                 if (func) {
6634                                         if (func(lst))
6635                                                 nfsd_inject_add_lock_to_list(lst,
6636                                                                         collect);
6637                                 }
6638                                 ++count;
6639                                 /*
6640                                  * Despite the fact that these functions deal
6641                                  * with 64-bit integers for "count", we must
6642                                  * ensure that it doesn't blow up the
6643                                  * clp->cl_refcount. Throw a warning if we
6644                                  * start to approach INT_MAX here.
6645                                  */
6646                                 WARN_ON_ONCE(count == (INT_MAX / 2));
6647                                 if (count == max)
6648                                         goto out;
6649                         }
6650                 }
6651         }
6652 out:
6653         spin_unlock(&clp->cl_lock);
6654
6655         return count;
6656 }
6657
6658 static u64
6659 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
6660                           u64 max)
6661 {
6662         return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
6663 }
6664
6665 static u64
6666 nfsd_print_client_locks(struct nfs4_client *clp)
6667 {
6668         u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
6669         nfsd_print_count(clp, count, "locked files");
6670         return count;
6671 }
6672
6673 u64
6674 nfsd_inject_print_locks(void)
6675 {
6676         struct nfs4_client *clp;
6677         u64 count = 0;
6678         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6679                                                 nfsd_net_id);
6680
6681         if (!nfsd_netns_ready(nn))
6682                 return 0;
6683
6684         spin_lock(&nn->client_lock);
6685         list_for_each_entry(clp, &nn->client_lru, cl_lru)
6686                 count += nfsd_print_client_locks(clp);
6687         spin_unlock(&nn->client_lock);
6688
6689         return count;
6690 }
6691
6692 static void
6693 nfsd_reap_locks(struct list_head *reaplist)
6694 {
6695         struct nfs4_client *clp;
6696         struct nfs4_ol_stateid *stp, *next;
6697
6698         list_for_each_entry_safe(stp, next, reaplist, st_locks) {
6699                 list_del_init(&stp->st_locks);
6700                 clp = stp->st_stid.sc_client;
6701                 nfs4_put_stid(&stp->st_stid);
6702                 put_client(clp);
6703         }
6704 }
6705
6706 u64
6707 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
6708 {
6709         unsigned int count = 0;
6710         struct nfs4_client *clp;
6711         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6712                                                 nfsd_net_id);
6713         LIST_HEAD(reaplist);
6714
6715         if (!nfsd_netns_ready(nn))
6716                 return count;
6717
6718         spin_lock(&nn->client_lock);
6719         clp = nfsd_find_client(addr, addr_size);
6720         if (clp)
6721                 count = nfsd_collect_client_locks(clp, &reaplist, 0);
6722         spin_unlock(&nn->client_lock);
6723         nfsd_reap_locks(&reaplist);
6724         return count;
6725 }
6726
6727 u64
6728 nfsd_inject_forget_locks(u64 max)
6729 {
6730         u64 count = 0;
6731         struct nfs4_client *clp;
6732         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6733                                                 nfsd_net_id);
6734         LIST_HEAD(reaplist);
6735
6736         if (!nfsd_netns_ready(nn))
6737                 return count;
6738
6739         spin_lock(&nn->client_lock);
6740         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6741                 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
6742                 if (max != 0 && count >= max)
6743                         break;
6744         }
6745         spin_unlock(&nn->client_lock);
6746         nfsd_reap_locks(&reaplist);
6747         return count;
6748 }
6749
6750 static u64
6751 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
6752                               struct list_head *collect,
6753                               void (*func)(struct nfs4_openowner *))
6754 {
6755         struct nfs4_openowner *oop, *next;
6756         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6757                                                 nfsd_net_id);
6758         u64 count = 0;
6759
6760         lockdep_assert_held(&nn->client_lock);
6761
6762         spin_lock(&clp->cl_lock);
6763         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
6764                 if (func) {
6765                         func(oop);
6766                         if (collect) {
6767                                 atomic_inc(&clp->cl_refcount);
6768                                 list_add(&oop->oo_perclient, collect);
6769                         }
6770                 }
6771                 ++count;
6772                 /*
6773                  * Despite the fact that these functions deal with
6774                  * 64-bit integers for "count", we must ensure that
6775                  * it doesn't blow up the clp->cl_refcount. Throw a
6776                  * warning if we start to approach INT_MAX here.
6777                  */
6778                 WARN_ON_ONCE(count == (INT_MAX / 2));
6779                 if (count == max)
6780                         break;
6781         }
6782         spin_unlock(&clp->cl_lock);
6783
6784         return count;
6785 }
6786
6787 static u64
6788 nfsd_print_client_openowners(struct nfs4_client *clp)
6789 {
6790         u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
6791
6792         nfsd_print_count(clp, count, "openowners");
6793         return count;
6794 }
6795
6796 static u64
6797 nfsd_collect_client_openowners(struct nfs4_client *clp,
6798                                struct list_head *collect, u64 max)
6799 {
6800         return nfsd_foreach_client_openowner(clp, max, collect,
6801                                                 unhash_openowner_locked);
6802 }
6803
6804 u64
6805 nfsd_inject_print_openowners(void)
6806 {
6807         struct nfs4_client *clp;
6808         u64 count = 0;
6809         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6810                                                 nfsd_net_id);
6811
6812         if (!nfsd_netns_ready(nn))
6813                 return 0;
6814
6815         spin_lock(&nn->client_lock);
6816         list_for_each_entry(clp, &nn->client_lru, cl_lru)
6817                 count += nfsd_print_client_openowners(clp);
6818         spin_unlock(&nn->client_lock);
6819
6820         return count;
6821 }
6822
6823 static void
6824 nfsd_reap_openowners(struct list_head *reaplist)
6825 {
6826         struct nfs4_client *clp;
6827         struct nfs4_openowner *oop, *next;
6828
6829         list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
6830                 list_del_init(&oop->oo_perclient);
6831                 clp = oop->oo_owner.so_client;
6832                 release_openowner(oop);
6833                 put_client(clp);
6834         }
6835 }
6836
6837 u64
6838 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
6839                                      size_t addr_size)
6840 {
6841         unsigned int count = 0;
6842         struct nfs4_client *clp;
6843         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6844                                                 nfsd_net_id);
6845         LIST_HEAD(reaplist);
6846
6847         if (!nfsd_netns_ready(nn))
6848                 return count;
6849
6850         spin_lock(&nn->client_lock);
6851         clp = nfsd_find_client(addr, addr_size);
6852         if (clp)
6853                 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
6854         spin_unlock(&nn->client_lock);
6855         nfsd_reap_openowners(&reaplist);
6856         return count;
6857 }
6858
6859 u64
6860 nfsd_inject_forget_openowners(u64 max)
6861 {
6862         u64 count = 0;
6863         struct nfs4_client *clp;
6864         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6865                                                 nfsd_net_id);
6866         LIST_HEAD(reaplist);
6867
6868         if (!nfsd_netns_ready(nn))
6869                 return count;
6870
6871         spin_lock(&nn->client_lock);
6872         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6873                 count += nfsd_collect_client_openowners(clp, &reaplist,
6874                                                         max - count);
6875                 if (max != 0 && count >= max)
6876                         break;
6877         }
6878         spin_unlock(&nn->client_lock);
6879         nfsd_reap_openowners(&reaplist);
6880         return count;
6881 }
6882
6883 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
6884                                      struct list_head *victims)
6885 {
6886         struct nfs4_delegation *dp, *next;
6887         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6888                                                 nfsd_net_id);
6889         u64 count = 0;
6890
6891         lockdep_assert_held(&nn->client_lock);
6892
6893         spin_lock(&state_lock);
6894         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
6895                 if (victims) {
6896                         /*
6897                          * It's not safe to mess with delegations that have a
6898                          * non-zero dl_time. They might have already been broken
6899                          * and could be processed by the laundromat outside of
6900                          * the state_lock. Just leave them be.
6901                          */
6902                         if (dp->dl_time != 0)
6903                                 continue;
6904
6905                         atomic_inc(&clp->cl_refcount);
6906                         WARN_ON(!unhash_delegation_locked(dp));
6907                         list_add(&dp->dl_recall_lru, victims);
6908                 }
6909                 ++count;
6910                 /*
6911                  * Despite the fact that these functions deal with
6912                  * 64-bit integers for "count", we must ensure that
6913                  * it doesn't blow up the clp->cl_refcount. Throw a
6914                  * warning if we start to approach INT_MAX here.
6915                  */
6916                 WARN_ON_ONCE(count == (INT_MAX / 2));
6917                 if (count == max)
6918                         break;
6919         }
6920         spin_unlock(&state_lock);
6921         return count;
6922 }
6923
6924 static u64
6925 nfsd_print_client_delegations(struct nfs4_client *clp)
6926 {
6927         u64 count = nfsd_find_all_delegations(clp, 0, NULL);
6928
6929         nfsd_print_count(clp, count, "delegations");
6930         return count;
6931 }
6932
6933 u64
6934 nfsd_inject_print_delegations(void)
6935 {
6936         struct nfs4_client *clp;
6937         u64 count = 0;
6938         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6939                                                 nfsd_net_id);
6940
6941         if (!nfsd_netns_ready(nn))
6942                 return 0;
6943
6944         spin_lock(&nn->client_lock);
6945         list_for_each_entry(clp, &nn->client_lru, cl_lru)
6946                 count += nfsd_print_client_delegations(clp);
6947         spin_unlock(&nn->client_lock);
6948
6949         return count;
6950 }
6951
6952 static void
6953 nfsd_forget_delegations(struct list_head *reaplist)
6954 {
6955         struct nfs4_client *clp;
6956         struct nfs4_delegation *dp, *next;
6957
6958         list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6959                 list_del_init(&dp->dl_recall_lru);
6960                 clp = dp->dl_stid.sc_client;
6961                 revoke_delegation(dp);
6962                 put_client(clp);
6963         }
6964 }
6965
6966 u64
6967 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
6968                                       size_t addr_size)
6969 {
6970         u64 count = 0;
6971         struct nfs4_client *clp;
6972         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6973                                                 nfsd_net_id);
6974         LIST_HEAD(reaplist);
6975
6976         if (!nfsd_netns_ready(nn))
6977                 return count;
6978
6979         spin_lock(&nn->client_lock);
6980         clp = nfsd_find_client(addr, addr_size);
6981         if (clp)
6982                 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6983         spin_unlock(&nn->client_lock);
6984
6985         nfsd_forget_delegations(&reaplist);
6986         return count;
6987 }
6988
6989 u64
6990 nfsd_inject_forget_delegations(u64 max)
6991 {
6992         u64 count = 0;
6993         struct nfs4_client *clp;
6994         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6995                                                 nfsd_net_id);
6996         LIST_HEAD(reaplist);
6997
6998         if (!nfsd_netns_ready(nn))
6999                 return count;
7000
7001         spin_lock(&nn->client_lock);
7002         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7003                 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7004                 if (max != 0 && count >= max)
7005                         break;
7006         }
7007         spin_unlock(&nn->client_lock);
7008         nfsd_forget_delegations(&reaplist);
7009         return count;
7010 }
7011
7012 static void
7013 nfsd_recall_delegations(struct list_head *reaplist)
7014 {
7015         struct nfs4_client *clp;
7016         struct nfs4_delegation *dp, *next;
7017
7018         list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
7019                 list_del_init(&dp->dl_recall_lru);
7020                 clp = dp->dl_stid.sc_client;
7021                 /*
7022                  * We skipped all entries that had a zero dl_time before,
7023                  * so we can now reset the dl_time back to 0. If a delegation
7024                  * break comes in now, then it won't make any difference since
7025                  * we're recalling it either way.
7026                  */
7027                 spin_lock(&state_lock);
7028                 dp->dl_time = 0;
7029                 spin_unlock(&state_lock);
7030                 nfsd_break_one_deleg(dp);
7031                 put_client(clp);
7032         }
7033 }
7034
7035 u64
7036 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
7037                                       size_t addr_size)
7038 {
7039         u64 count = 0;
7040         struct nfs4_client *clp;
7041         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7042                                                 nfsd_net_id);
7043         LIST_HEAD(reaplist);
7044
7045         if (!nfsd_netns_ready(nn))
7046                 return count;
7047
7048         spin_lock(&nn->client_lock);
7049         clp = nfsd_find_client(addr, addr_size);
7050         if (clp)
7051                 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7052         spin_unlock(&nn->client_lock);
7053
7054         nfsd_recall_delegations(&reaplist);
7055         return count;
7056 }
7057
7058 u64
7059 nfsd_inject_recall_delegations(u64 max)
7060 {
7061         u64 count = 0;
7062         struct nfs4_client *clp, *next;
7063         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7064                                                 nfsd_net_id);
7065         LIST_HEAD(reaplist);
7066
7067         if (!nfsd_netns_ready(nn))
7068                 return count;
7069
7070         spin_lock(&nn->client_lock);
7071         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7072                 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7073                 if (max != 0 && ++count >= max)
7074                         break;
7075         }
7076         spin_unlock(&nn->client_lock);
7077         nfsd_recall_delegations(&reaplist);
7078         return count;
7079 }
7080 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7081
7082 /*
7083  * Since the lifetime of a delegation isn't limited to that of an open, a
7084  * client may quite reasonably hang on to a delegation as long as it has
7085  * the inode cached.  This becomes an obvious problem the first time a
7086  * client's inode cache approaches the size of the server's total memory.
7087  *
7088  * For now we avoid this problem by imposing a hard limit on the number
7089  * of delegations, which varies according to the server's memory size.
7090  */
7091 static void
7092 set_max_delegations(void)
7093 {
7094         /*
7095          * Allow at most 4 delegations per megabyte of RAM.  Quick
7096          * estimates suggest that in the worst case (where every delegation
7097          * is for a different inode), a delegation could take about 1.5K,
7098          * giving a worst case usage of about 6% of memory.
7099          */
7100         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7101 }
7102
7103 static int nfs4_state_create_net(struct net *net)
7104 {
7105         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7106         int i;
7107
7108         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
7109                         CLIENT_HASH_SIZE, GFP_KERNEL);
7110         if (!nn->conf_id_hashtbl)
7111                 goto err;
7112         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
7113                         CLIENT_HASH_SIZE, GFP_KERNEL);
7114         if (!nn->unconf_id_hashtbl)
7115                 goto err_unconf_id;
7116         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
7117                         SESSION_HASH_SIZE, GFP_KERNEL);
7118         if (!nn->sessionid_hashtbl)
7119                 goto err_sessionid;
7120
7121         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7122                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7123                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7124         }
7125         for (i = 0; i < SESSION_HASH_SIZE; i++)
7126                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7127         nn->conf_name_tree = RB_ROOT;
7128         nn->unconf_name_tree = RB_ROOT;
7129         nn->boot_time = get_seconds();
7130         nn->grace_ended = false;
7131         nn->nfsd4_manager.block_opens = true;
7132         INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7133         INIT_LIST_HEAD(&nn->client_lru);
7134         INIT_LIST_HEAD(&nn->close_lru);
7135         INIT_LIST_HEAD(&nn->del_recall_lru);
7136         spin_lock_init(&nn->client_lock);
7137
7138         spin_lock_init(&nn->blocked_locks_lock);
7139         INIT_LIST_HEAD(&nn->blocked_locks_lru);
7140
7141         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7142         get_net(net);
7143
7144         return 0;
7145
7146 err_sessionid:
7147         kfree(nn->unconf_id_hashtbl);
7148 err_unconf_id:
7149         kfree(nn->conf_id_hashtbl);
7150 err:
7151         return -ENOMEM;
7152 }
7153
7154 static void
7155 nfs4_state_destroy_net(struct net *net)
7156 {
7157         int i;
7158         struct nfs4_client *clp = NULL;
7159         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7160
7161         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7162                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7163                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7164                         destroy_client(clp);
7165                 }
7166         }
7167
7168         WARN_ON(!list_empty(&nn->blocked_locks_lru));
7169
7170         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7171                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7172                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7173                         destroy_client(clp);
7174                 }
7175         }
7176
7177         kfree(nn->sessionid_hashtbl);
7178         kfree(nn->unconf_id_hashtbl);
7179         kfree(nn->conf_id_hashtbl);
7180         put_net(net);
7181 }
7182
7183 int
7184 nfs4_state_start_net(struct net *net)
7185 {
7186         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7187         int ret;
7188
7189         ret = nfs4_state_create_net(net);
7190         if (ret)
7191                 return ret;
7192         locks_start_grace(net, &nn->nfsd4_manager);
7193         nfsd4_client_tracking_init(net);
7194         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
7195                nn->nfsd4_grace, net);
7196         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7197         return 0;
7198 }
7199
7200 /* initialization to perform when the nfsd service is started: */
7201
7202 int
7203 nfs4_state_start(void)
7204 {
7205         int ret;
7206
7207         ret = set_callback_cred();
7208         if (ret)
7209                 return ret;
7210
7211         laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7212         if (laundry_wq == NULL) {
7213                 ret = -ENOMEM;
7214                 goto out_cleanup_cred;
7215         }
7216         ret = nfsd4_create_callback_queue();
7217         if (ret)
7218                 goto out_free_laundry;
7219
7220         set_max_delegations();
7221         return 0;
7222
7223 out_free_laundry:
7224         destroy_workqueue(laundry_wq);
7225 out_cleanup_cred:
7226         cleanup_callback_cred();
7227         return ret;
7228 }
7229
7230 void
7231 nfs4_state_shutdown_net(struct net *net)
7232 {
7233         struct nfs4_delegation *dp = NULL;
7234         struct list_head *pos, *next, reaplist;
7235         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7236
7237         cancel_delayed_work_sync(&nn->laundromat_work);
7238         locks_end_grace(&nn->nfsd4_manager);
7239
7240         INIT_LIST_HEAD(&reaplist);
7241         spin_lock(&state_lock);
7242         list_for_each_safe(pos, next, &nn->del_recall_lru) {
7243                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7244                 WARN_ON(!unhash_delegation_locked(dp));
7245                 list_add(&dp->dl_recall_lru, &reaplist);
7246         }
7247         spin_unlock(&state_lock);
7248         list_for_each_safe(pos, next, &reaplist) {
7249                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7250                 list_del_init(&dp->dl_recall_lru);
7251                 put_clnt_odstate(dp->dl_clnt_odstate);
7252                 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
7253                 nfs4_put_stid(&dp->dl_stid);
7254         }
7255
7256         nfsd4_client_tracking_exit(net);
7257         nfs4_state_destroy_net(net);
7258 }
7259
7260 void
7261 nfs4_state_shutdown(void)
7262 {
7263         destroy_workqueue(laundry_wq);
7264         nfsd4_destroy_callback_queue();
7265         cleanup_callback_cred();
7266 }
7267
7268 static void
7269 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7270 {
7271         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
7272                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7273 }
7274
7275 static void
7276 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7277 {
7278         if (cstate->minorversion) {
7279                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7280                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7281         }
7282 }
7283
7284 void
7285 clear_current_stateid(struct nfsd4_compound_state *cstate)
7286 {
7287         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7288 }
7289
7290 /*
7291  * functions to set current state id
7292  */
7293 void
7294 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
7295                 union nfsd4_op_u *u)
7296 {
7297         put_stateid(cstate, &u->open_downgrade.od_stateid);
7298 }
7299
7300 void
7301 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
7302                 union nfsd4_op_u *u)
7303 {
7304         put_stateid(cstate, &u->open.op_stateid);
7305 }
7306
7307 void
7308 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
7309                 union nfsd4_op_u *u)
7310 {
7311         put_stateid(cstate, &u->close.cl_stateid);
7312 }
7313
7314 void
7315 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
7316                 union nfsd4_op_u *u)
7317 {
7318         put_stateid(cstate, &u->lock.lk_resp_stateid);
7319 }
7320
7321 /*
7322  * functions to consume current state id
7323  */
7324
7325 void
7326 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
7327                 union nfsd4_op_u *u)
7328 {
7329         get_stateid(cstate, &u->open_downgrade.od_stateid);
7330 }
7331
7332 void
7333 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
7334                 union nfsd4_op_u *u)
7335 {
7336         get_stateid(cstate, &u->delegreturn.dr_stateid);
7337 }
7338
7339 void
7340 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
7341                 union nfsd4_op_u *u)
7342 {
7343         get_stateid(cstate, &u->free_stateid.fr_stateid);
7344 }
7345
7346 void
7347 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
7348                 union nfsd4_op_u *u)
7349 {
7350         get_stateid(cstate, &u->setattr.sa_stateid);
7351 }
7352
7353 void
7354 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
7355                 union nfsd4_op_u *u)
7356 {
7357         get_stateid(cstate, &u->close.cl_stateid);
7358 }
7359
7360 void
7361 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
7362                 union nfsd4_op_u *u)
7363 {
7364         get_stateid(cstate, &u->locku.lu_stateid);
7365 }
7366
7367 void
7368 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
7369                 union nfsd4_op_u *u)
7370 {
7371         get_stateid(cstate, &u->read.rd_stateid);
7372 }
7373
7374 void
7375 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
7376                 union nfsd4_op_u *u)
7377 {
7378         get_stateid(cstate, &u->write.wr_stateid);
7379 }