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/hash.h>
  45 #include "xdr4.h"
  46 #include "xdr4cb.h"
  47 #include "vfs.h"
  48 #include "current_stateid.h"
  49
  50 #include "netns.h"
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 #define all_ones {{~0,~0},~0}
  55 static const stateid_t one_stateid = {
  56         .si_generation = ~0,
  57         .si_opaque = all_ones,
  58 };
  59 static const stateid_t zero_stateid = {
  60         /* all fields zero */
  61 };
  62 static const stateid_t currentstateid = {
  63         .si_generation = 1,
  64 };
  65
  66 static u64 current_sessionid = 1;
  67
  68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  70 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  71
  72 /* forward declarations */
  73 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  74
  75 /* Locking: */
  76
  77 /* Currently used for almost all code touching nfsv4 state: */
  78 static DEFINE_MUTEX(client_mutex);
  79
  80 /*
  81  * Currently used for the del_recall_lru and file hash table.  In an
  82  * effort to decrease the scope of the client_mutex, this spinlock may
  83  * eventually cover more:
  84  */
  85 static DEFINE_SPINLOCK(state_lock);
  86
  87 static struct kmem_cache *openowner_slab;
  88 static struct kmem_cache *lockowner_slab;
  89 static struct kmem_cache *file_slab;
  90 static struct kmem_cache *stateid_slab;
  91 static struct kmem_cache *deleg_slab;
  92
  93 void
  94 nfs4_lock_state(void)
  95 {
  96         mutex_lock(&client_mutex);
  97 }
  98
  99 static void free_session(struct nfsd4_session *);
 100
 101 static bool is_session_dead(struct nfsd4_session *ses)
 102 {
 103         return ses->se_flags & NFS4_SESSION_DEAD;
 104 }
 105
 106 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 107 {
 108         if (atomic_read(&ses->se_ref) > ref_held_by_me)
 109                 return nfserr_jukebox;
 110         ses->se_flags |= NFS4_SESSION_DEAD;
 111         return nfs_ok;
 112 }
 113
 114 void
 115 nfs4_unlock_state(void)
 116 {
 117         mutex_unlock(&client_mutex);
 118 }
 119
 120 static bool is_client_expired(struct nfs4_client *clp)
 121 {
 122         return clp->cl_time == 0;
 123 }
 124
 125 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
 126 {
 127         if (atomic_read(&clp->cl_refcount))
 128                 return nfserr_jukebox;
 129         clp->cl_time = 0;
 130         return nfs_ok;
 131 }
 132
 133 static __be32 mark_client_expired(struct nfs4_client *clp)
 134 {
 135         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 136         __be32 ret;
 137
 138         spin_lock(&nn->client_lock);
 139         ret = mark_client_expired_locked(clp);
 140         spin_unlock(&nn->client_lock);
 141         return ret;
 142 }
 143
 144 static __be32 get_client_locked(struct nfs4_client *clp)
 145 {
 146         if (is_client_expired(clp))
 147                 return nfserr_expired;
 148         atomic_inc(&clp->cl_refcount);
 149         return nfs_ok;
 150 }
 151
 152 /* must be called under the client_lock */
 153 static inline void
 154 renew_client_locked(struct nfs4_client *clp)
 155 {
 156         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 157
 158         if (is_client_expired(clp)) {
 159                 WARN_ON(1);
 160                 printk("%s: client (clientid %08x/%08x) already expired\n",
 161                         __func__,
 162                         clp->cl_clientid.cl_boot,
 163                         clp->cl_clientid.cl_id);
 164                 return;
 165         }
 166
 167         dprintk("renewing client (clientid %08x/%08x)\n",
 168                         clp->cl_clientid.cl_boot,
 169                         clp->cl_clientid.cl_id);
 170         list_move_tail(&clp->cl_lru, &nn->client_lru);
 171         clp->cl_time = get_seconds();
 172 }
 173
 174 static inline void
 175 renew_client(struct nfs4_client *clp)
 176 {
 177         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 178
 179         spin_lock(&nn->client_lock);
 180         renew_client_locked(clp);
 181         spin_unlock(&nn->client_lock);
 182 }
 183
 184 static void put_client_renew_locked(struct nfs4_client *clp)
 185 {
 186         if (!atomic_dec_and_test(&clp->cl_refcount))
 187                 return;
 188         if (!is_client_expired(clp))
 189                 renew_client_locked(clp);
 190 }
 191
 192 static void put_client_renew(struct nfs4_client *clp)
 193 {
 194         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 195
 196         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
 197                 return;
 198         if (!is_client_expired(clp))
 199                 renew_client_locked(clp);
 200         spin_unlock(&nn->client_lock);
 201 }
 202
 203 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 204 {
 205         __be32 status;
 206
 207         if (is_session_dead(ses))
 208                 return nfserr_badsession;
 209         status = get_client_locked(ses->se_client);
 210         if (status)
 211                 return status;
 212         atomic_inc(&ses->se_ref);
 213         return nfs_ok;
 214 }
 215
 216 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 217 {
 218         struct nfs4_client *clp = ses->se_client;
 219
 220         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 221                 free_session(ses);
 222         put_client_renew_locked(clp);
 223 }
 224
 225 static void nfsd4_put_session(struct nfsd4_session *ses)
 226 {
 227         struct nfs4_client *clp = ses->se_client;
 228         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 229
 230         spin_lock(&nn->client_lock);
 231         nfsd4_put_session_locked(ses);
 232         spin_unlock(&nn->client_lock);
 233 }
 234
 235
 236 static inline u32
 237 opaque_hashval(const void *ptr, int nbytes)
 238 {
 239         unsigned char *cptr = (unsigned char *) ptr;
 240
 241         u32 x = 0;
 242         while (nbytes--) {
 243                 x *= 37;
 244                 x += *cptr++;
 245         }
 246         return x;
 247 }
 248
 249 static void nfsd4_free_file(struct nfs4_file *f)
 250 {
 251         kmem_cache_free(file_slab, f);
 252 }
 253
 254 static inline void
 255 put_nfs4_file(struct nfs4_file *fi)
 256 {
 257         if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
 258                 hlist_del(&fi->fi_hash);
 259                 spin_unlock(&state_lock);
 260                 iput(fi->fi_inode);
 261                 nfsd4_free_file(fi);
 262         }
 263 }
 264
 265 static inline void
 266 get_nfs4_file(struct nfs4_file *fi)
 267 {
 268         atomic_inc(&fi->fi_ref);
 269 }
 270
 271 static struct file *
 272 __nfs4_get_fd(struct nfs4_file *f, int oflag)
 273 {
 274         if (f->fi_fds[oflag])
 275                 return get_file(f->fi_fds[oflag]);
 276         return NULL;
 277 }
 278
 279 static struct file *
 280 find_writeable_file_locked(struct nfs4_file *f)
 281 {
 282         struct file *ret;
 283
 284         lockdep_assert_held(&f->fi_lock);
 285
 286         ret = __nfs4_get_fd(f, O_WRONLY);
 287         if (!ret)
 288                 ret = __nfs4_get_fd(f, O_RDWR);
 289         return ret;
 290 }
 291
 292 static struct file *
 293 find_writeable_file(struct nfs4_file *f)
 294 {
 295         struct file *ret;
 296
 297         spin_lock(&f->fi_lock);
 298         ret = find_writeable_file_locked(f);
 299         spin_unlock(&f->fi_lock);
 300
 301         return ret;
 302 }
 303
 304 static struct file *find_readable_file_locked(struct nfs4_file *f)
 305 {
 306         struct file *ret;
 307
 308         lockdep_assert_held(&f->fi_lock);
 309
 310         ret = __nfs4_get_fd(f, O_RDONLY);
 311         if (!ret)
 312                 ret = __nfs4_get_fd(f, O_RDWR);
 313         return ret;
 314 }
 315
 316 static struct file *
 317 find_readable_file(struct nfs4_file *f)
 318 {
 319         struct file *ret;
 320
 321         spin_lock(&f->fi_lock);
 322         ret = find_readable_file_locked(f);
 323         spin_unlock(&f->fi_lock);
 324
 325         return ret;
 326 }
 327
 328 static struct file *
 329 find_any_file(struct nfs4_file *f)
 330 {
 331         struct file *ret;
 332
 333         spin_lock(&f->fi_lock);
 334         ret = __nfs4_get_fd(f, O_RDWR);
 335         if (!ret) {
 336                 ret = __nfs4_get_fd(f, O_WRONLY);
 337                 if (!ret)
 338                         ret = __nfs4_get_fd(f, O_RDONLY);
 339         }
 340         spin_unlock(&f->fi_lock);
 341         return ret;
 342 }
 343
 344 static int num_delegations;
 345 unsigned long max_delegations;
 346
 347 /*
 348  * Open owner state (share locks)
 349  */
 350
 351 /* hash tables for lock and open owners */
 352 #define OWNER_HASH_BITS              8
 353 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 354 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 355
 356 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 357 {
 358         unsigned int ret;
 359
 360         ret = opaque_hashval(ownername->data, ownername->len);
 361         ret += clientid;
 362         return ret & OWNER_HASH_MASK;
 363 }
 364
 365 /* hash table for nfs4_file */
 366 #define FILE_HASH_BITS                   8
 367 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 368
 369 static unsigned int file_hashval(struct inode *ino)
 370 {
 371         /* XXX: why are we hashing on inode pointer, anyway? */
 372         return hash_ptr(ino, FILE_HASH_BITS);
 373 }
 374
 375 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 376
 377 static void
 378 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 379 {
 380         if (access & NFS4_SHARE_ACCESS_WRITE)
 381                 atomic_inc(&fp->fi_access[O_WRONLY]);
 382         if (access & NFS4_SHARE_ACCESS_READ)
 383                 atomic_inc(&fp->fi_access[O_RDONLY]);
 384 }
 385
 386 static __be32
 387 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 388 {
 389         /* Does this access mode make sense? */
 390         if (access & ~NFS4_SHARE_ACCESS_BOTH)
 391                 return nfserr_inval;
 392
 393         __nfs4_file_get_access(fp, access);
 394         return nfs_ok;
 395 }
 396
 397 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 398 {
 399         might_lock(&fp->fi_lock);
 400
 401         if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
 402                 struct file *f1 = NULL;
 403                 struct file *f2 = NULL;
 404
 405                 swap(f1, fp->fi_fds[oflag]);
 406                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 407                         swap(f2, fp->fi_fds[O_RDWR]);
 408                 spin_unlock(&fp->fi_lock);
 409                 if (f1)
 410                         fput(f1);
 411                 if (f2)
 412                         fput(f2);
 413         }
 414 }
 415
 416 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
 417 {
 418         WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
 419
 420         if (access & NFS4_SHARE_ACCESS_WRITE)
 421                 __nfs4_file_put_access(fp, O_WRONLY);
 422         if (access & NFS4_SHARE_ACCESS_READ)
 423                 __nfs4_file_put_access(fp, O_RDONLY);
 424 }
 425
 426 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
 427 kmem_cache *slab)
 428 {
 429         struct idr *stateids = &cl->cl_stateids;
 430         struct nfs4_stid *stid;
 431         int new_id;
 432
 433         stid = kmem_cache_alloc(slab, GFP_KERNEL);
 434         if (!stid)
 435                 return NULL;
 436
 437         new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
 438         if (new_id < 0)
 439                 goto out_free;
 440         stid->sc_client = cl;
 441         stid->sc_type = 0;
 442         stid->sc_stateid.si_opaque.so_id = new_id;
 443         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 444         /* Will be incremented before return to client: */
 445         stid->sc_stateid.si_generation = 0;
 446
 447         /*
 448          * It shouldn't be a problem to reuse an opaque stateid value.
 449          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 450          * example, a stray write retransmission could be accepted by
 451          * the server when it should have been rejected.  Therefore,
 452          * adopt a trick from the sctp code to attempt to maximize the
 453          * amount of time until an id is reused, by ensuring they always
 454          * "increase" (mod INT_MAX):
 455          */
 456         return stid;
 457 out_free:
 458         kmem_cache_free(slab, stid);
 459         return NULL;
 460 }
 461
 462 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 463 {
 464         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 465 }
 466
 467 /*
 468  * When we recall a delegation, we should be careful not to hand it
 469  * out again straight away.
 470  * To ensure this we keep a pair of bloom filters ('new' and 'old')
 471  * in which the filehandles of recalled delegations are "stored".
 472  * If a filehandle appear in either filter, a delegation is blocked.
 473  * When a delegation is recalled, the filehandle is stored in the "new"
 474  * filter.
 475  * Every 30 seconds we swap the filters and clear the "new" one,
 476  * unless both are empty of course.
 477  *
 478  * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
 479  * low 3 bytes as hash-table indices.
 480  *
 481  * 'state_lock', which is always held when block_delegations() is called,
 482  * is used to manage concurrent access.  Testing does not need the lock
 483  * except when swapping the two filters.
 484  */
 485 static struct bloom_pair {
 486         int     entries, old_entries;
 487         time_t  swap_time;
 488         int     new; /* index into 'set' */
 489         DECLARE_BITMAP(set[2], 256);
 490 } blocked_delegations;
 491
 492 static int delegation_blocked(struct knfsd_fh *fh)
 493 {
 494         u32 hash;
 495         struct bloom_pair *bd = &blocked_delegations;
 496
 497         if (bd->entries == 0)
 498                 return 0;
 499         if (seconds_since_boot() - bd->swap_time > 30) {
 500                 spin_lock(&state_lock);
 501                 if (seconds_since_boot() - bd->swap_time > 30) {
 502                         bd->entries -= bd->old_entries;
 503                         bd->old_entries = bd->entries;
 504                         memset(bd->set[bd->new], 0,
 505                                sizeof(bd->set[0]));
 506                         bd->new = 1-bd->new;
 507                         bd->swap_time = seconds_since_boot();
 508                 }
 509                 spin_unlock(&state_lock);
 510         }
 511         hash = arch_fast_hash(&fh->fh_base, fh->fh_size, 0);
 512         if (test_bit(hash&255, bd->set[0]) &&
 513             test_bit((hash>>8)&255, bd->set[0]) &&
 514             test_bit((hash>>16)&255, bd->set[0]))
 515                 return 1;
 516
 517         if (test_bit(hash&255, bd->set[1]) &&
 518             test_bit((hash>>8)&255, bd->set[1]) &&
 519             test_bit((hash>>16)&255, bd->set[1]))
 520                 return 1;
 521
 522         return 0;
 523 }
 524
 525 static void block_delegations(struct knfsd_fh *fh)
 526 {
 527         u32 hash;
 528         struct bloom_pair *bd = &blocked_delegations;
 529
 530         hash = arch_fast_hash(&fh->fh_base, fh->fh_size, 0);
 531
 532         __set_bit(hash&255, bd->set[bd->new]);
 533         __set_bit((hash>>8)&255, bd->set[bd->new]);
 534         __set_bit((hash>>16)&255, bd->set[bd->new]);
 535         if (bd->entries == 0)
 536                 bd->swap_time = seconds_since_boot();
 537         bd->entries += 1;
 538 }
 539
 540 static struct nfs4_delegation *
 541 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
 542 {
 543         struct nfs4_delegation *dp;
 544
 545         dprintk("NFSD alloc_init_deleg\n");
 546         if (num_delegations > max_delegations)
 547                 return NULL;
 548         if (delegation_blocked(&current_fh->fh_handle))
 549                 return NULL;
 550         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 551         if (dp == NULL)
 552                 return dp;
 553         /*
 554          * delegation seqid's are never incremented.  The 4.1 special
 555          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 556          * 0 anyway just for consistency and use 1:
 557          */
 558         dp->dl_stid.sc_stateid.si_generation = 1;
 559         num_delegations++;
 560         INIT_LIST_HEAD(&dp->dl_perfile);
 561         INIT_LIST_HEAD(&dp->dl_perclnt);
 562         INIT_LIST_HEAD(&dp->dl_recall_lru);
 563         dp->dl_file = NULL;
 564         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
 565         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 566         dp->dl_time = 0;
 567         atomic_set(&dp->dl_count, 1);
 568         nfsd4_init_callback(&dp->dl_recall);
 569         return dp;
 570 }
 571
 572 static void remove_stid(struct nfs4_stid *s)
 573 {
 574         struct idr *stateids = &s->sc_client->cl_stateids;
 575
 576         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 577 }
 578
 579 static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
 580 {
 581         kmem_cache_free(slab, s);
 582 }
 583
 584 void
 585 nfs4_put_delegation(struct nfs4_delegation *dp)
 586 {
 587         if (atomic_dec_and_test(&dp->dl_count)) {
 588                 nfs4_free_stid(deleg_slab, &dp->dl_stid);
 589                 num_delegations--;
 590         }
 591 }
 592
 593 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 594 {
 595         if (!fp->fi_lease)
 596                 return;
 597         if (atomic_dec_and_test(&fp->fi_delegees)) {
 598                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 599                 fp->fi_lease = NULL;
 600                 fput(fp->fi_deleg_file);
 601                 fp->fi_deleg_file = NULL;
 602         }
 603 }
 604
 605 static void unhash_stid(struct nfs4_stid *s)
 606 {
 607         s->sc_type = 0;
 608 }
 609
 610 static void
 611 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 612 {
 613         lockdep_assert_held(&state_lock);
 614
 615         dp->dl_stid.sc_type = NFS4_DELEG_STID;
 616         list_add(&dp->dl_perfile, &fp->fi_delegations);
 617         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
 618 }
 619
 620 /* Called under the state lock. */
 621 static void
 622 unhash_delegation(struct nfs4_delegation *dp)
 623 {
 624         spin_lock(&state_lock);
 625         list_del_init(&dp->dl_perclnt);
 626         list_del_init(&dp->dl_perfile);
 627         list_del_init(&dp->dl_recall_lru);
 628         spin_unlock(&state_lock);
 629         if (dp->dl_file) {
 630                 nfs4_put_deleg_lease(dp->dl_file);
 631                 put_nfs4_file(dp->dl_file);
 632                 dp->dl_file = NULL;
 633         }
 634 }
 635
 636
 637
 638 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
 639 {
 640         list_del_init(&dp->dl_recall_lru);
 641         remove_stid(&dp->dl_stid);
 642         nfs4_put_delegation(dp);
 643 }
 644
 645 static void destroy_delegation(struct nfs4_delegation *dp)
 646 {
 647         unhash_delegation(dp);
 648         remove_stid(&dp->dl_stid);
 649         nfs4_put_delegation(dp);
 650 }
 651
 652 static void revoke_delegation(struct nfs4_delegation *dp)
 653 {
 654         struct nfs4_client *clp = dp->dl_stid.sc_client;
 655
 656         if (clp->cl_minorversion == 0)
 657                 destroy_delegation(dp);
 658         else {
 659                 unhash_delegation(dp);
 660                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
 661                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
 662         }
 663 }
 664
 665 /*
 666  * SETCLIENTID state
 667  */
 668
 669 static unsigned int clientid_hashval(u32 id)
 670 {
 671         return id & CLIENT_HASH_MASK;
 672 }
 673
 674 static unsigned int clientstr_hashval(const char *name)
 675 {
 676         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 677 }
 678
 679 /*
 680  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 681  * st_{access,deny}_bmap field of the stateid, in order to track not
 682  * only what share bits are currently in force, but also what
 683  * combinations of share bits previous opens have used.  This allows us
 684  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 685  * return an error if the client attempt to downgrade to a combination
 686  * of share bits not explicable by closing some of its previous opens.
 687  *
 688  * XXX: This enforcement is actually incomplete, since we don't keep
 689  * track of access/deny bit combinations; so, e.g., we allow:
 690  *
 691  *      OPEN allow read, deny write
 692  *      OPEN allow both, deny none
 693  *      DOWNGRADE allow read, deny none
 694  *
 695  * which we should reject.
 696  */
 697 static unsigned int
 698 bmap_to_share_mode(unsigned long bmap) {
 699         int i;
 700         unsigned int access = 0;
 701
 702         for (i = 1; i < 4; i++) {
 703                 if (test_bit(i, &bmap))
 704                         access |= i;
 705         }
 706         return access;
 707 }
 708
 709 static bool
 710 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 711         unsigned int access, deny;
 712
 713         access = bmap_to_share_mode(stp->st_access_bmap);
 714         deny = bmap_to_share_mode(stp->st_deny_bmap);
 715         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 716                 return false;
 717         return true;
 718 }
 719
 720 /* set share access for a given stateid */
 721 static inline void
 722 set_access(u32 access, struct nfs4_ol_stateid *stp)
 723 {
 724         unsigned char mask = 1 << access;
 725
 726         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 727         stp->st_access_bmap |= mask;
 728 }
 729
 730 /* clear share access for a given stateid */
 731 static inline void
 732 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 733 {
 734         unsigned char mask = 1 << access;
 735
 736         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 737         stp->st_access_bmap &= ~mask;
 738 }
 739
 740 /* test whether a given stateid has access */
 741 static inline bool
 742 test_access(u32 access, struct nfs4_ol_stateid *stp)
 743 {
 744         unsigned char mask = 1 << access;
 745
 746         return (bool)(stp->st_access_bmap & mask);
 747 }
 748
 749 /* set share deny for a given stateid */
 750 static inline void
 751 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
 752 {
 753         unsigned char mask = 1 << deny;
 754
 755         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 756         stp->st_deny_bmap |= mask;
 757 }
 758
 759 /* clear share deny for a given stateid */
 760 static inline void
 761 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
 762 {
 763         unsigned char mask = 1 << deny;
 764
 765         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 766         stp->st_deny_bmap &= ~mask;
 767 }
 768
 769 /* test whether a given stateid is denying specific access */
 770 static inline bool
 771 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
 772 {
 773         unsigned char mask = 1 << deny;
 774
 775         return (bool)(stp->st_deny_bmap & mask);
 776 }
 777
 778 static int nfs4_access_to_omode(u32 access)
 779 {
 780         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 781         case NFS4_SHARE_ACCESS_READ:
 782                 return O_RDONLY;
 783         case NFS4_SHARE_ACCESS_WRITE:
 784                 return O_WRONLY;
 785         case NFS4_SHARE_ACCESS_BOTH:
 786                 return O_RDWR;
 787         }
 788         WARN_ON_ONCE(1);
 789         return O_RDONLY;
 790 }
 791
 792 /* release all access and file references for a given stateid */
 793 static void
 794 release_all_access(struct nfs4_ol_stateid *stp)
 795 {
 796         int i;
 797
 798         for (i = 1; i < 4; i++) {
 799                 if (test_access(i, stp))
 800                         nfs4_file_put_access(stp->st_file, i);
 801                 clear_access(i, stp);
 802         }
 803 }
 804
 805 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 806 {
 807         struct nfs4_file *fp = stp->st_file;
 808
 809         spin_lock(&fp->fi_lock);
 810         list_del(&stp->st_perfile);
 811         spin_unlock(&fp->fi_lock);
 812         list_del(&stp->st_perstateowner);
 813 }
 814
 815 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 816 {
 817         release_all_access(stp);
 818         put_nfs4_file(stp->st_file);
 819         stp->st_file = NULL;
 820 }
 821
 822 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 823 {
 824         remove_stid(&stp->st_stid);
 825         nfs4_free_stid(stateid_slab, &stp->st_stid);
 826 }
 827
 828 static void __release_lock_stateid(struct nfs4_ol_stateid *stp)
 829 {
 830         struct file *file;
 831
 832         list_del(&stp->st_locks);
 833         unhash_generic_stateid(stp);
 834         unhash_stid(&stp->st_stid);
 835         file = find_any_file(stp->st_file);
 836         if (file)
 837                 filp_close(file, (fl_owner_t)lockowner(stp->st_stateowner));
 838         close_generic_stateid(stp);
 839         free_generic_stateid(stp);
 840 }
 841
 842 static void unhash_lockowner(struct nfs4_lockowner *lo)
 843 {
 844         struct nfs4_ol_stateid *stp;
 845
 846         list_del(&lo->lo_owner.so_strhash);
 847         while (!list_empty(&lo->lo_owner.so_stateids)) {
 848                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 849                                 struct nfs4_ol_stateid, st_perstateowner);
 850                 __release_lock_stateid(stp);
 851         }
 852 }
 853
 854 static void nfs4_free_lockowner(struct nfs4_lockowner *lo)
 855 {
 856         kfree(lo->lo_owner.so_owner.data);
 857         kmem_cache_free(lockowner_slab, lo);
 858 }
 859
 860 static void release_lockowner(struct nfs4_lockowner *lo)
 861 {
 862         unhash_lockowner(lo);
 863         nfs4_free_lockowner(lo);
 864 }
 865
 866 static void release_lockowner_if_empty(struct nfs4_lockowner *lo)
 867 {
 868         if (list_empty(&lo->lo_owner.so_stateids))
 869                 release_lockowner(lo);
 870 }
 871
 872 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 873 {
 874         struct nfs4_lockowner *lo;
 875
 876         lo = lockowner(stp->st_stateowner);
 877         __release_lock_stateid(stp);
 878         release_lockowner_if_empty(lo);
 879 }
 880
 881 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp)
 882 {
 883         struct nfs4_ol_stateid *stp;
 884
 885         while (!list_empty(&open_stp->st_locks)) {
 886                 stp = list_entry(open_stp->st_locks.next,
 887                                 struct nfs4_ol_stateid, st_locks);
 888                 release_lock_stateid(stp);
 889         }
 890 }
 891
 892 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 893 {
 894         unhash_generic_stateid(stp);
 895         release_open_stateid_locks(stp);
 896         close_generic_stateid(stp);
 897 }
 898
 899 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 900 {
 901         unhash_open_stateid(stp);
 902         free_generic_stateid(stp);
 903 }
 904
 905 static void unhash_openowner(struct nfs4_openowner *oo)
 906 {
 907         struct nfs4_ol_stateid *stp;
 908
 909         list_del(&oo->oo_owner.so_strhash);
 910         list_del(&oo->oo_perclient);
 911         while (!list_empty(&oo->oo_owner.so_stateids)) {
 912                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 913                                 struct nfs4_ol_stateid, st_perstateowner);
 914                 release_open_stateid(stp);
 915         }
 916 }
 917
 918 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 919 {
 920         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 921
 922         if (s) {
 923                 free_generic_stateid(s);
 924                 oo->oo_last_closed_stid = NULL;
 925         }
 926 }
 927
 928 static void nfs4_free_openowner(struct nfs4_openowner *oo)
 929 {
 930         kfree(oo->oo_owner.so_owner.data);
 931         kmem_cache_free(openowner_slab, oo);
 932 }
 933
 934 static void release_openowner(struct nfs4_openowner *oo)
 935 {
 936         unhash_openowner(oo);
 937         list_del(&oo->oo_close_lru);
 938         release_last_closed_stateid(oo);
 939         nfs4_free_openowner(oo);
 940 }
 941
 942 static inline int
 943 hash_sessionid(struct nfs4_sessionid *sessionid)
 944 {
 945         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 946
 947         return sid->sequence % SESSION_HASH_SIZE;
 948 }
 949
 950 #ifdef NFSD_DEBUG
 951 static inline void
 952 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 953 {
 954         u32 *ptr = (u32 *)(&sessionid->data[0]);
 955         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 956 }
 957 #else
 958 static inline void
 959 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 960 {
 961 }
 962 #endif
 963
 964 /*
 965  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
 966  * won't be used for replay.
 967  */
 968 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
 969 {
 970         struct nfs4_stateowner *so = cstate->replay_owner;
 971
 972         if (nfserr == nfserr_replay_me)
 973                 return;
 974
 975         if (!seqid_mutating_err(ntohl(nfserr))) {
 976                 cstate->replay_owner = NULL;
 977                 return;
 978         }
 979         if (!so)
 980                 return;
 981         if (so->so_is_open_owner)
 982                 release_last_closed_stateid(openowner(so));
 983         so->so_seqid++;
 984         return;
 985 }
 986
 987 static void
 988 gen_sessionid(struct nfsd4_session *ses)
 989 {
 990         struct nfs4_client *clp = ses->se_client;
 991         struct nfsd4_sessionid *sid;
 992
 993         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 994         sid->clientid = clp->cl_clientid;
 995         sid->sequence = current_sessionid++;
 996         sid->reserved = 0;
 997 }
 998
 999 /*
1000  * The protocol defines ca_maxresponssize_cached to include the size of
1001  * the rpc header, but all we need to cache is the data starting after
1002  * the end of the initial SEQUENCE operation--the rest we regenerate
1003  * each time.  Therefore we can advertise a ca_maxresponssize_cached
1004  * value that is the number of bytes in our cache plus a few additional
1005  * bytes.  In order to stay on the safe side, and not promise more than
1006  * we can cache, those additional bytes must be the minimum possible: 24
1007  * bytes of rpc header (xid through accept state, with AUTH_NULL
1008  * verifier), 12 for the compound header (with zero-length tag), and 44
1009  * for the SEQUENCE op response:
1010  */
1011 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
1012
1013 static void
1014 free_session_slots(struct nfsd4_session *ses)
1015 {
1016         int i;
1017
1018         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
1019                 kfree(ses->se_slots[i]);
1020 }
1021
1022 /*
1023  * We don't actually need to cache the rpc and session headers, so we
1024  * can allocate a little less for each slot:
1025  */
1026 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1027 {
1028         u32 size;
1029
1030         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1031                 size = 0;
1032         else
1033                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1034         return size + sizeof(struct nfsd4_slot);
1035 }
1036
1037 /*
1038  * XXX: If we run out of reserved DRC memory we could (up to a point)
1039  * re-negotiate active sessions and reduce their slot usage to make
1040  * room for new connections. For now we just fail the create session.
1041  */
1042 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1043 {
1044         u32 slotsize = slot_bytes(ca);
1045         u32 num = ca->maxreqs;
1046         int avail;
1047
1048         spin_lock(&nfsd_drc_lock);
1049         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1050                     nfsd_drc_max_mem - nfsd_drc_mem_used);
1051         num = min_t(int, num, avail / slotsize);
1052         nfsd_drc_mem_used += num * slotsize;
1053         spin_unlock(&nfsd_drc_lock);
1054
1055         return num;
1056 }
1057
1058 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1059 {
1060         int slotsize = slot_bytes(ca);
1061
1062         spin_lock(&nfsd_drc_lock);
1063         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1064         spin_unlock(&nfsd_drc_lock);
1065 }
1066
1067 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1068                                            struct nfsd4_channel_attrs *battrs)
1069 {
1070         int numslots = fattrs->maxreqs;
1071         int slotsize = slot_bytes(fattrs);
1072         struct nfsd4_session *new;
1073         int mem, i;
1074
1075         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1076                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
1077         mem = numslots * sizeof(struct nfsd4_slot *);
1078
1079         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1080         if (!new)
1081                 return NULL;
1082         /* allocate each struct nfsd4_slot and data cache in one piece */
1083         for (i = 0; i < numslots; i++) {
1084                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1085                 if (!new->se_slots[i])
1086                         goto out_free;
1087         }
1088
1089         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1090         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1091
1092         return new;
1093 out_free:
1094         while (i--)
1095                 kfree(new->se_slots[i]);
1096         kfree(new);
1097         return NULL;
1098 }
1099
1100 static void free_conn(struct nfsd4_conn *c)
1101 {
1102         svc_xprt_put(c->cn_xprt);
1103         kfree(c);
1104 }
1105
1106 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1107 {
1108         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1109         struct nfs4_client *clp = c->cn_session->se_client;
1110
1111         spin_lock(&clp->cl_lock);
1112         if (!list_empty(&c->cn_persession)) {
1113                 list_del(&c->cn_persession);
1114                 free_conn(c);
1115         }
1116         nfsd4_probe_callback(clp);
1117         spin_unlock(&clp->cl_lock);
1118 }
1119
1120 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1121 {
1122         struct nfsd4_conn *conn;
1123
1124         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1125         if (!conn)
1126                 return NULL;
1127         svc_xprt_get(rqstp->rq_xprt);
1128         conn->cn_xprt = rqstp->rq_xprt;
1129         conn->cn_flags = flags;
1130         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1131         return conn;
1132 }
1133
1134 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1135 {
1136         conn->cn_session = ses;
1137         list_add(&conn->cn_persession, &ses->se_conns);
1138 }
1139
1140 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1141 {
1142         struct nfs4_client *clp = ses->se_client;
1143
1144         spin_lock(&clp->cl_lock);
1145         __nfsd4_hash_conn(conn, ses);
1146         spin_unlock(&clp->cl_lock);
1147 }
1148
1149 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1150 {
1151         conn->cn_xpt_user.callback = nfsd4_conn_lost;
1152         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1153 }
1154
1155 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1156 {
1157         int ret;
1158
1159         nfsd4_hash_conn(conn, ses);
1160         ret = nfsd4_register_conn(conn);
1161         if (ret)
1162                 /* oops; xprt is already down: */
1163                 nfsd4_conn_lost(&conn->cn_xpt_user);
1164         if (conn->cn_flags & NFS4_CDFC4_BACK) {
1165                 /* callback channel may be back up */
1166                 nfsd4_probe_callback(ses->se_client);
1167         }
1168 }
1169
1170 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1171 {
1172         u32 dir = NFS4_CDFC4_FORE;
1173
1174         if (cses->flags & SESSION4_BACK_CHAN)
1175                 dir |= NFS4_CDFC4_BACK;
1176         return alloc_conn(rqstp, dir);
1177 }
1178
1179 /* must be called under client_lock */
1180 static void nfsd4_del_conns(struct nfsd4_session *s)
1181 {
1182         struct nfs4_client *clp = s->se_client;
1183         struct nfsd4_conn *c;
1184
1185         spin_lock(&clp->cl_lock);
1186         while (!list_empty(&s->se_conns)) {
1187                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1188                 list_del_init(&c->cn_persession);
1189                 spin_unlock(&clp->cl_lock);
1190
1191                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1192                 free_conn(c);
1193
1194                 spin_lock(&clp->cl_lock);
1195         }
1196         spin_unlock(&clp->cl_lock);
1197 }
1198
1199 static void __free_session(struct nfsd4_session *ses)
1200 {
1201         free_session_slots(ses);
1202         kfree(ses);
1203 }
1204
1205 static void free_session(struct nfsd4_session *ses)
1206 {
1207         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
1208
1209         lockdep_assert_held(&nn->client_lock);
1210         nfsd4_del_conns(ses);
1211         nfsd4_put_drc_mem(&ses->se_fchannel);
1212         __free_session(ses);
1213 }
1214
1215 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1216 {
1217         int idx;
1218         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1219
1220         new->se_client = clp;
1221         gen_sessionid(new);
1222
1223         INIT_LIST_HEAD(&new->se_conns);
1224
1225         new->se_cb_seq_nr = 1;
1226         new->se_flags = cses->flags;
1227         new->se_cb_prog = cses->callback_prog;
1228         new->se_cb_sec = cses->cb_sec;
1229         atomic_set(&new->se_ref, 0);
1230         idx = hash_sessionid(&new->se_sessionid);
1231         spin_lock(&nn->client_lock);
1232         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1233         spin_lock(&clp->cl_lock);
1234         list_add(&new->se_perclnt, &clp->cl_sessions);
1235         spin_unlock(&clp->cl_lock);
1236         spin_unlock(&nn->client_lock);
1237
1238         if (cses->flags & SESSION4_BACK_CHAN) {
1239                 struct sockaddr *sa = svc_addr(rqstp);
1240                 /*
1241                  * This is a little silly; with sessions there's no real
1242                  * use for the callback address.  Use the peer address
1243                  * as a reasonable default for now, but consider fixing
1244                  * the rpc client not to require an address in the
1245                  * future:
1246                  */
1247                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1248                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1249         }
1250 }
1251
1252 /* caller must hold client_lock */
1253 static struct nfsd4_session *
1254 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1255 {
1256         struct nfsd4_session *elem;
1257         int idx;
1258         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1259
1260         dump_sessionid(__func__, sessionid);
1261         idx = hash_sessionid(sessionid);
1262         /* Search in the appropriate list */
1263         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1264                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1265                             NFS4_MAX_SESSIONID_LEN)) {
1266                         return elem;
1267                 }
1268         }
1269
1270         dprintk("%s: session not found\n", __func__);
1271         return NULL;
1272 }
1273
1274 static struct nfsd4_session *
1275 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1276                 __be32 *ret)
1277 {
1278         struct nfsd4_session *session;
1279         __be32 status = nfserr_badsession;
1280
1281         session = __find_in_sessionid_hashtbl(sessionid, net);
1282         if (!session)
1283                 goto out;
1284         status = nfsd4_get_session_locked(session);
1285         if (status)
1286                 session = NULL;
1287 out:
1288         *ret = status;
1289         return session;
1290 }
1291
1292 /* caller must hold client_lock */
1293 static void
1294 unhash_session(struct nfsd4_session *ses)
1295 {
1296         list_del(&ses->se_hash);
1297         spin_lock(&ses->se_client->cl_lock);
1298         list_del(&ses->se_perclnt);
1299         spin_unlock(&ses->se_client->cl_lock);
1300 }
1301
1302 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1303 static int
1304 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1305 {
1306         if (clid->cl_boot == nn->boot_time)
1307                 return 0;
1308         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1309                 clid->cl_boot, clid->cl_id, nn->boot_time);
1310         return 1;
1311 }
1312
1313 /*
1314  * XXX Should we use a slab cache ?
1315  * This type of memory management is somewhat inefficient, but we use it
1316  * anyway since SETCLIENTID is not a common operation.
1317  */
1318 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1319 {
1320         struct nfs4_client *clp;
1321
1322         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1323         if (clp == NULL)
1324                 return NULL;
1325         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1326         if (clp->cl_name.data == NULL) {
1327                 kfree(clp);
1328                 return NULL;
1329         }
1330         clp->cl_name.len = name.len;
1331         INIT_LIST_HEAD(&clp->cl_sessions);
1332         idr_init(&clp->cl_stateids);
1333         atomic_set(&clp->cl_refcount, 0);
1334         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1335         INIT_LIST_HEAD(&clp->cl_idhash);
1336         INIT_LIST_HEAD(&clp->cl_openowners);
1337         INIT_LIST_HEAD(&clp->cl_delegations);
1338         INIT_LIST_HEAD(&clp->cl_lru);
1339         INIT_LIST_HEAD(&clp->cl_callbacks);
1340         INIT_LIST_HEAD(&clp->cl_revoked);
1341         spin_lock_init(&clp->cl_lock);
1342         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1343         return clp;
1344 }
1345
1346 static void
1347 free_client(struct nfs4_client *clp)
1348 {
1349         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1350
1351         lockdep_assert_held(&nn->client_lock);
1352         while (!list_empty(&clp->cl_sessions)) {
1353                 struct nfsd4_session *ses;
1354                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1355                                 se_perclnt);
1356                 list_del(&ses->se_perclnt);
1357                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1358                 free_session(ses);
1359         }
1360         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1361         free_svc_cred(&clp->cl_cred);
1362         kfree(clp->cl_name.data);
1363         idr_destroy(&clp->cl_stateids);
1364         kfree(clp);
1365 }
1366
1367 /* must be called under the client_lock */
1368 static inline void
1369 unhash_client_locked(struct nfs4_client *clp)
1370 {
1371         struct nfsd4_session *ses;
1372
1373         list_del(&clp->cl_lru);
1374         spin_lock(&clp->cl_lock);
1375         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1376                 list_del_init(&ses->se_hash);
1377         spin_unlock(&clp->cl_lock);
1378 }
1379
1380 static void
1381 destroy_client(struct nfs4_client *clp)
1382 {
1383         struct nfs4_openowner *oo;
1384         struct nfs4_delegation *dp;
1385         struct list_head reaplist;
1386         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1387
1388         INIT_LIST_HEAD(&reaplist);
1389         spin_lock(&state_lock);
1390         while (!list_empty(&clp->cl_delegations)) {
1391                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1392                 list_del_init(&dp->dl_perclnt);
1393                 /* Ensure that deleg break won't try to requeue it */
1394                 ++dp->dl_time;
1395                 list_move(&dp->dl_recall_lru, &reaplist);
1396         }
1397         spin_unlock(&state_lock);
1398         while (!list_empty(&reaplist)) {
1399                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1400                 destroy_delegation(dp);
1401         }
1402         list_splice_init(&clp->cl_revoked, &reaplist);
1403         while (!list_empty(&reaplist)) {
1404                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1405                 destroy_revoked_delegation(dp);
1406         }
1407         while (!list_empty(&clp->cl_openowners)) {
1408                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1409                 release_openowner(oo);
1410         }
1411         nfsd4_shutdown_callback(clp);
1412         if (clp->cl_cb_conn.cb_xprt)
1413                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1414         list_del(&clp->cl_idhash);
1415         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1416                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1417         else
1418                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1419         spin_lock(&nn->client_lock);
1420         unhash_client_locked(clp);
1421         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1422         free_client(clp);
1423         spin_unlock(&nn->client_lock);
1424 }
1425
1426 static void expire_client(struct nfs4_client *clp)
1427 {
1428         nfsd4_client_record_remove(clp);
1429         destroy_client(clp);
1430 }
1431
1432 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1433 {
1434         memcpy(target->cl_verifier.data, source->data,
1435                         sizeof(target->cl_verifier.data));
1436 }
1437
1438 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1439 {
1440         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1441         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1442 }
1443
1444 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1445 {
1446         if (source->cr_principal) {
1447                 target->cr_principal =
1448                                 kstrdup(source->cr_principal, GFP_KERNEL);
1449                 if (target->cr_principal == NULL)
1450                         return -ENOMEM;
1451         } else
1452                 target->cr_principal = NULL;
1453         target->cr_flavor = source->cr_flavor;
1454         target->cr_uid = source->cr_uid;
1455         target->cr_gid = source->cr_gid;
1456         target->cr_group_info = source->cr_group_info;
1457         get_group_info(target->cr_group_info);
1458         target->cr_gss_mech = source->cr_gss_mech;
1459         if (source->cr_gss_mech)
1460                 gss_mech_get(source->cr_gss_mech);
1461         return 0;
1462 }
1463
1464 static long long
1465 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1466 {
1467         long long res;
1468
1469         res = o1->len - o2->len;
1470         if (res)
1471                 return res;
1472         return (long long)memcmp(o1->data, o2->data, o1->len);
1473 }
1474
1475 static int same_name(const char *n1, const char *n2)
1476 {
1477         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1478 }
1479
1480 static int
1481 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1482 {
1483         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1484 }
1485
1486 static int
1487 same_clid(clientid_t *cl1, clientid_t *cl2)
1488 {
1489         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1490 }
1491
1492 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1493 {
1494         int i;
1495
1496         if (g1->ngroups != g2->ngroups)
1497                 return false;
1498         for (i=0; i<g1->ngroups; i++)
1499                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1500                         return false;
1501         return true;
1502 }
1503
1504 /*
1505  * RFC 3530 language requires clid_inuse be returned when the
1506  * "principal" associated with a requests differs from that previously
1507  * used.  We use uid, gid's, and gss principal string as our best
1508  * approximation.  We also don't want to allow non-gss use of a client
1509  * established using gss: in theory cr_principal should catch that
1510  * change, but in practice cr_principal can be null even in the gss case
1511  * since gssd doesn't always pass down a principal string.
1512  */
1513 static bool is_gss_cred(struct svc_cred *cr)
1514 {
1515         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1516         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1517 }
1518
1519
1520 static bool
1521 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1522 {
1523         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1524                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1525                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1526                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1527                 return false;
1528         if (cr1->cr_principal == cr2->cr_principal)
1529                 return true;
1530         if (!cr1->cr_principal || !cr2->cr_principal)
1531                 return false;
1532         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1533 }
1534
1535 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1536 {
1537         struct svc_cred *cr = &rqstp->rq_cred;
1538         u32 service;
1539
1540         if (!cr->cr_gss_mech)
1541                 return false;
1542         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1543         return service == RPC_GSS_SVC_INTEGRITY ||
1544                service == RPC_GSS_SVC_PRIVACY;
1545 }
1546
1547 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1548 {
1549         struct svc_cred *cr = &rqstp->rq_cred;
1550
1551         if (!cl->cl_mach_cred)
1552                 return true;
1553         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1554                 return false;
1555         if (!svc_rqst_integrity_protected(rqstp))
1556                 return false;
1557         if (!cr->cr_principal)
1558                 return false;
1559         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1560 }
1561
1562 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1563 {
1564         static u32 current_clientid = 1;
1565
1566         clp->cl_clientid.cl_boot = nn->boot_time;
1567         clp->cl_clientid.cl_id = current_clientid++;
1568 }
1569
1570 static void gen_confirm(struct nfs4_client *clp)
1571 {
1572         __be32 verf[2];
1573         static u32 i;
1574
1575         /*
1576          * This is opaque to client, so no need to byte-swap. Use
1577          * __force to keep sparse happy
1578          */
1579         verf[0] = (__force __be32)get_seconds();
1580         verf[1] = (__force __be32)i++;
1581         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1582 }
1583
1584 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1585 {
1586         struct nfs4_stid *ret;
1587
1588         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1589         if (!ret || !ret->sc_type)
1590                 return NULL;
1591         return ret;
1592 }
1593
1594 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1595 {
1596         struct nfs4_stid *s;
1597
1598         s = find_stateid(cl, t);
1599         if (!s)
1600                 return NULL;
1601         if (typemask & s->sc_type)
1602                 return s;
1603         return NULL;
1604 }
1605
1606 static struct nfs4_client *create_client(struct xdr_netobj name,
1607                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1608 {
1609         struct nfs4_client *clp;
1610         struct sockaddr *sa = svc_addr(rqstp);
1611         int ret;
1612         struct net *net = SVC_NET(rqstp);
1613         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1614
1615         clp = alloc_client(name);
1616         if (clp == NULL)
1617                 return NULL;
1618
1619         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1620         if (ret) {
1621                 spin_lock(&nn->client_lock);
1622                 free_client(clp);
1623                 spin_unlock(&nn->client_lock);
1624                 return NULL;
1625         }
1626         nfsd4_init_callback(&clp->cl_cb_null);
1627         clp->cl_time = get_seconds();
1628         clear_bit(0, &clp->cl_cb_slot_busy);
1629         copy_verf(clp, verf);
1630         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1631         gen_confirm(clp);
1632         clp->cl_cb_session = NULL;
1633         clp->net = net;
1634         return clp;
1635 }
1636
1637 static void
1638 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1639 {
1640         struct rb_node **new = &(root->rb_node), *parent = NULL;
1641         struct nfs4_client *clp;
1642
1643         while (*new) {
1644                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1645                 parent = *new;
1646
1647                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1648                         new = &((*new)->rb_left);
1649                 else
1650                         new = &((*new)->rb_right);
1651         }
1652
1653         rb_link_node(&new_clp->cl_namenode, parent, new);
1654         rb_insert_color(&new_clp->cl_namenode, root);
1655 }
1656
1657 static struct nfs4_client *
1658 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1659 {
1660         long long cmp;
1661         struct rb_node *node = root->rb_node;
1662         struct nfs4_client *clp;
1663
1664         while (node) {
1665                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1666                 cmp = compare_blob(&clp->cl_name, name);
1667                 if (cmp > 0)
1668                         node = node->rb_left;
1669                 else if (cmp < 0)
1670                         node = node->rb_right;
1671                 else
1672                         return clp;
1673         }
1674         return NULL;
1675 }
1676
1677 static void
1678 add_to_unconfirmed(struct nfs4_client *clp)
1679 {
1680         unsigned int idhashval;
1681         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1682
1683         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1684         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1685         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1686         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1687         renew_client(clp);
1688 }
1689
1690 static void
1691 move_to_confirmed(struct nfs4_client *clp)
1692 {
1693         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1694         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1695
1696         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1697         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1698         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1699         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1700         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1701         renew_client(clp);
1702 }
1703
1704 static struct nfs4_client *
1705 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1706 {
1707         struct nfs4_client *clp;
1708         unsigned int idhashval = clientid_hashval(clid->cl_id);
1709
1710         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1711                 if (same_clid(&clp->cl_clientid, clid)) {
1712                         if ((bool)clp->cl_minorversion != sessions)
1713                                 return NULL;
1714                         renew_client(clp);
1715                         return clp;
1716                 }
1717         }
1718         return NULL;
1719 }
1720
1721 static struct nfs4_client *
1722 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1723 {
1724         struct list_head *tbl = nn->conf_id_hashtbl;
1725
1726         return find_client_in_id_table(tbl, clid, sessions);
1727 }
1728
1729 static struct nfs4_client *
1730 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1731 {
1732         struct list_head *tbl = nn->unconf_id_hashtbl;
1733
1734         return find_client_in_id_table(tbl, clid, sessions);
1735 }
1736
1737 static bool clp_used_exchangeid(struct nfs4_client *clp)
1738 {
1739         return clp->cl_exchange_flags != 0;
1740 }
1741
1742 static struct nfs4_client *
1743 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1744 {
1745         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1746 }
1747
1748 static struct nfs4_client *
1749 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1750 {
1751         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1752 }
1753
1754 static void
1755 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1756 {
1757         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1758         struct sockaddr *sa = svc_addr(rqstp);
1759         u32 scopeid = rpc_get_scope_id(sa);
1760         unsigned short expected_family;
1761
1762         /* Currently, we only support tcp and tcp6 for the callback channel */
1763         if (se->se_callback_netid_len == 3 &&
1764             !memcmp(se->se_callback_netid_val, "tcp", 3))
1765                 expected_family = AF_INET;
1766         else if (se->se_callback_netid_len == 4 &&
1767                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1768                 expected_family = AF_INET6;
1769         else
1770                 goto out_err;
1771
1772         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1773                                             se->se_callback_addr_len,
1774                                             (struct sockaddr *)&conn->cb_addr,
1775                                             sizeof(conn->cb_addr));
1776
1777         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1778                 goto out_err;
1779
1780         if (conn->cb_addr.ss_family == AF_INET6)
1781                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1782
1783         conn->cb_prog = se->se_callback_prog;
1784         conn->cb_ident = se->se_callback_ident;
1785         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1786         return;
1787 out_err:
1788         conn->cb_addr.ss_family = AF_UNSPEC;
1789         conn->cb_addrlen = 0;
1790         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1791                 "will not receive delegations\n",
1792                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1793
1794         return;
1795 }
1796
1797 /*
1798  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1799  */
1800 static void
1801 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1802 {
1803         struct xdr_buf *buf = resp->xdr.buf;
1804         struct nfsd4_slot *slot = resp->cstate.slot;
1805         unsigned int base;
1806
1807         dprintk("--> %s slot %p\n", __func__, slot);
1808
1809         slot->sl_opcnt = resp->opcnt;
1810         slot->sl_status = resp->cstate.status;
1811
1812         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1813         if (nfsd4_not_cached(resp)) {
1814                 slot->sl_datalen = 0;
1815                 return;
1816         }
1817         base = resp->cstate.data_offset;
1818         slot->sl_datalen = buf->len - base;
1819         if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
1820                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1821         return;
1822 }
1823
1824 /*
1825  * Encode the replay sequence operation from the slot values.
1826  * If cachethis is FALSE encode the uncached rep error on the next
1827  * operation which sets resp->p and increments resp->opcnt for
1828  * nfs4svc_encode_compoundres.
1829  *
1830  */
1831 static __be32
1832 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1833                           struct nfsd4_compoundres *resp)
1834 {
1835         struct nfsd4_op *op;
1836         struct nfsd4_slot *slot = resp->cstate.slot;
1837
1838         /* Encode the replayed sequence operation */
1839         op = &args->ops[resp->opcnt - 1];
1840         nfsd4_encode_operation(resp, op);
1841
1842         /* Return nfserr_retry_uncached_rep in next operation. */
1843         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1844                 op = &args->ops[resp->opcnt++];
1845                 op->status = nfserr_retry_uncached_rep;
1846                 nfsd4_encode_operation(resp, op);
1847         }
1848         return op->status;
1849 }
1850
1851 /*
1852  * The sequence operation is not cached because we can use the slot and
1853  * session values.
1854  */
1855 static __be32
1856 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1857                          struct nfsd4_sequence *seq)
1858 {
1859         struct nfsd4_slot *slot = resp->cstate.slot;
1860         struct xdr_stream *xdr = &resp->xdr;
1861         __be32 *p;
1862         __be32 status;
1863
1864         dprintk("--> %s slot %p\n", __func__, slot);
1865
1866         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1867         if (status)
1868                 return status;
1869
1870         p = xdr_reserve_space(xdr, slot->sl_datalen);
1871         if (!p) {
1872                 WARN_ON_ONCE(1);
1873                 return nfserr_serverfault;
1874         }
1875         xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
1876         xdr_commit_encode(xdr);
1877
1878         resp->opcnt = slot->sl_opcnt;
1879         return slot->sl_status;
1880 }
1881
1882 /*
1883  * Set the exchange_id flags returned by the server.
1884  */
1885 static void
1886 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1887 {
1888         /* pNFS is not supported */
1889         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1890
1891         /* Referrals are supported, Migration is not. */
1892         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1893
1894         /* set the wire flags to return to client. */
1895         clid->flags = new->cl_exchange_flags;
1896 }
1897
1898 static bool client_has_state(struct nfs4_client *clp)
1899 {
1900         /*
1901          * Note clp->cl_openowners check isn't quite right: there's no
1902          * need to count owners without stateid's.
1903          *
1904          * Also note we should probably be using this in 4.0 case too.
1905          */
1906         return !list_empty(&clp->cl_openowners)
1907                 || !list_empty(&clp->cl_delegations)
1908                 || !list_empty(&clp->cl_sessions);
1909 }
1910
1911 __be32
1912 nfsd4_exchange_id(struct svc_rqst *rqstp,
1913                   struct nfsd4_compound_state *cstate,
1914                   struct nfsd4_exchange_id *exid)
1915 {
1916         struct nfs4_client *unconf, *conf, *new;
1917         __be32 status;
1918         char                    addr_str[INET6_ADDRSTRLEN];
1919         nfs4_verifier           verf = exid->verifier;
1920         struct sockaddr         *sa = svc_addr(rqstp);
1921         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1922         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1923
1924         rpc_ntop(sa, addr_str, sizeof(addr_str));
1925         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1926                 "ip_addr=%s flags %x, spa_how %d\n",
1927                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1928                 addr_str, exid->flags, exid->spa_how);
1929
1930         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1931                 return nfserr_inval;
1932
1933         switch (exid->spa_how) {
1934         case SP4_MACH_CRED:
1935                 if (!svc_rqst_integrity_protected(rqstp))
1936                         return nfserr_inval;
1937         case SP4_NONE:
1938                 break;
1939         default:                                /* checked by xdr code */
1940                 WARN_ON_ONCE(1);
1941         case SP4_SSV:
1942                 return nfserr_encr_alg_unsupp;
1943         }
1944
1945         /* Cases below refer to rfc 5661 section 18.35.4: */
1946         nfs4_lock_state();
1947         conf = find_confirmed_client_by_name(&exid->clname, nn);
1948         if (conf) {
1949                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1950                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1951
1952                 if (update) {
1953                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1954                                 status = nfserr_inval;
1955                                 goto out;
1956                         }
1957                         if (!mach_creds_match(conf, rqstp)) {
1958                                 status = nfserr_wrong_cred;
1959                                 goto out;
1960                         }
1961                         if (!creds_match) { /* case 9 */
1962                                 status = nfserr_perm;
1963                                 goto out;
1964                         }
1965                         if (!verfs_match) { /* case 8 */
1966                                 status = nfserr_not_same;
1967                                 goto out;
1968                         }
1969                         /* case 6 */
1970                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1971                         new = conf;
1972                         goto out_copy;
1973                 }
1974                 if (!creds_match) { /* case 3 */
1975                         if (client_has_state(conf)) {
1976                                 status = nfserr_clid_inuse;
1977                                 goto out;
1978                         }
1979                         expire_client(conf);
1980                         goto out_new;
1981                 }
1982                 if (verfs_match) { /* case 2 */
1983                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1984                         new = conf;
1985                         goto out_copy;
1986                 }
1987                 /* case 5, client reboot */
1988                 goto out_new;
1989         }
1990
1991         if (update) { /* case 7 */
1992                 status = nfserr_noent;
1993                 goto out;
1994         }
1995
1996         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1997         if (unconf) /* case 4, possible retry or client restart */
1998                 expire_client(unconf);
1999
2000         /* case 1 (normal case) */
2001 out_new:
2002         new = create_client(exid->clname, rqstp, &verf);
2003         if (new == NULL) {
2004                 status = nfserr_jukebox;
2005                 goto out;
2006         }
2007         new->cl_minorversion = cstate->minorversion;
2008         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
2009
2010         gen_clid(new, nn);
2011         add_to_unconfirmed(new);
2012 out_copy:
2013         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
2014         exid->clientid.cl_id = new->cl_clientid.cl_id;
2015
2016         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
2017         nfsd4_set_ex_flags(new, exid);
2018
2019         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2020                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
2021         status = nfs_ok;
2022
2023 out:
2024         nfs4_unlock_state();
2025         return status;
2026 }
2027
2028 static __be32
2029 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2030 {
2031         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2032                 slot_seqid);
2033
2034         /* The slot is in use, and no response has been sent. */
2035         if (slot_inuse) {
2036                 if (seqid == slot_seqid)
2037                         return nfserr_jukebox;
2038                 else
2039                         return nfserr_seq_misordered;
2040         }
2041         /* Note unsigned 32-bit arithmetic handles wraparound: */
2042         if (likely(seqid == slot_seqid + 1))
2043                 return nfs_ok;
2044         if (seqid == slot_seqid)
2045                 return nfserr_replay_cache;
2046         return nfserr_seq_misordered;
2047 }
2048
2049 /*
2050  * Cache the create session result into the create session single DRC
2051  * slot cache by saving the xdr structure. sl_seqid has been set.
2052  * Do this for solo or embedded create session operations.
2053  */
2054 static void
2055 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2056                            struct nfsd4_clid_slot *slot, __be32 nfserr)
2057 {
2058         slot->sl_status = nfserr;
2059         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2060 }
2061
2062 static __be32
2063 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2064                             struct nfsd4_clid_slot *slot)
2065 {
2066         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2067         return slot->sl_status;
2068 }
2069
2070 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2071                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2072                         1 +     /* MIN tag is length with zero, only length */ \
2073                         3 +     /* version, opcount, opcode */ \
2074                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2075                                 /* seqid, slotID, slotID, cache */ \
2076                         4 ) * sizeof(__be32))
2077
2078 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2079                         2 +     /* verifier: AUTH_NULL, length 0 */\
2080                         1 +     /* status */ \
2081                         1 +     /* MIN tag is length with zero, only length */ \
2082                         3 +     /* opcount, opcode, opstatus*/ \
2083                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2084                                 /* seqid, slotID, slotID, slotID, status */ \
2085                         5 ) * sizeof(__be32))
2086
2087 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2088 {
2089         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2090
2091         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2092                 return nfserr_toosmall;
2093         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2094                 return nfserr_toosmall;
2095         ca->headerpadsz = 0;
2096         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2097         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2098         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2099         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2100                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2101         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2102         /*
2103          * Note decreasing slot size below client's request may make it
2104          * difficult for client to function correctly, whereas
2105          * decreasing the number of slots will (just?) affect
2106          * performance.  When short on memory we therefore prefer to
2107          * decrease number of slots instead of their size.  Clients that
2108          * request larger slots than they need will get poor results:
2109          */
2110         ca->maxreqs = nfsd4_get_drc_mem(ca);
2111         if (!ca->maxreqs)
2112                 return nfserr_jukebox;
2113
2114         return nfs_ok;
2115 }
2116
2117 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
2118                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
2119 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
2120                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
2121
2122 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2123 {
2124         ca->headerpadsz = 0;
2125
2126         /*
2127          * These RPC_MAX_HEADER macros are overkill, especially since we
2128          * don't even do gss on the backchannel yet.  But this is still
2129          * less than 1k.  Tighten up this estimate in the unlikely event
2130          * it turns out to be a problem for some client:
2131          */
2132         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2133                 return nfserr_toosmall;
2134         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2135                 return nfserr_toosmall;
2136         ca->maxresp_cached = 0;
2137         if (ca->maxops < 2)
2138                 return nfserr_toosmall;
2139
2140         return nfs_ok;
2141 }
2142
2143 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2144 {
2145         switch (cbs->flavor) {
2146         case RPC_AUTH_NULL:
2147         case RPC_AUTH_UNIX:
2148                 return nfs_ok;
2149         default:
2150                 /*
2151                  * GSS case: the spec doesn't allow us to return this
2152                  * error.  But it also doesn't allow us not to support
2153                  * GSS.
2154                  * I'd rather this fail hard than return some error the
2155                  * client might think it can already handle:
2156                  */
2157                 return nfserr_encr_alg_unsupp;
2158         }
2159 }
2160
2161 __be32
2162 nfsd4_create_session(struct svc_rqst *rqstp,
2163                      struct nfsd4_compound_state *cstate,
2164                      struct nfsd4_create_session *cr_ses)
2165 {
2166         struct sockaddr *sa = svc_addr(rqstp);
2167         struct nfs4_client *conf, *unconf;
2168         struct nfsd4_session *new;
2169         struct nfsd4_conn *conn;
2170         struct nfsd4_clid_slot *cs_slot = NULL;
2171         __be32 status = 0;
2172         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2173
2174         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2175                 return nfserr_inval;
2176         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2177         if (status)
2178                 return status;
2179         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2180         if (status)
2181                 return status;
2182         status = check_backchannel_attrs(&cr_ses->back_channel);
2183         if (status)
2184                 goto out_release_drc_mem;
2185         status = nfserr_jukebox;
2186         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2187         if (!new)
2188                 goto out_release_drc_mem;
2189         conn = alloc_conn_from_crses(rqstp, cr_ses);
2190         if (!conn)
2191                 goto out_free_session;
2192
2193         nfs4_lock_state();
2194         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2195         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2196         WARN_ON_ONCE(conf && unconf);
2197
2198         if (conf) {
2199                 status = nfserr_wrong_cred;
2200                 if (!mach_creds_match(conf, rqstp))
2201                         goto out_free_conn;
2202                 cs_slot = &conf->cl_cs_slot;
2203                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2204                 if (status == nfserr_replay_cache) {
2205                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
2206                         goto out_free_conn;
2207                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
2208                         status = nfserr_seq_misordered;
2209                         goto out_free_conn;
2210                 }
2211         } else if (unconf) {
2212                 struct nfs4_client *old;
2213                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2214                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2215                         status = nfserr_clid_inuse;
2216                         goto out_free_conn;
2217                 }
2218                 status = nfserr_wrong_cred;
2219                 if (!mach_creds_match(unconf, rqstp))
2220                         goto out_free_conn;
2221                 cs_slot = &unconf->cl_cs_slot;
2222                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2223                 if (status) {
2224                         /* an unconfirmed replay returns misordered */
2225                         status = nfserr_seq_misordered;
2226                         goto out_free_conn;
2227                 }
2228                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2229                 if (old) {
2230                         status = mark_client_expired(old);
2231                         if (status)
2232                                 goto out_free_conn;
2233                         expire_client(old);
2234                 }
2235                 move_to_confirmed(unconf);
2236                 conf = unconf;
2237         } else {
2238                 status = nfserr_stale_clientid;
2239                 goto out_free_conn;
2240         }
2241         status = nfs_ok;
2242         /*
2243          * We do not support RDMA or persistent sessions
2244          */
2245         cr_ses->flags &= ~SESSION4_PERSIST;
2246         cr_ses->flags &= ~SESSION4_RDMA;
2247
2248         init_session(rqstp, new, conf, cr_ses);
2249         nfsd4_init_conn(rqstp, conn, new);
2250
2251         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2252                NFS4_MAX_SESSIONID_LEN);
2253         cs_slot->sl_seqid++;
2254         cr_ses->seqid = cs_slot->sl_seqid;
2255
2256         /* cache solo and embedded create sessions under the state lock */
2257         nfsd4_cache_create_session(cr_ses, cs_slot, status);
2258         nfs4_unlock_state();
2259         return status;
2260 out_free_conn:
2261         nfs4_unlock_state();
2262         free_conn(conn);
2263 out_free_session:
2264         __free_session(new);
2265 out_release_drc_mem:
2266         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2267         return status;
2268 }
2269
2270 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2271 {
2272         switch (*dir) {
2273         case NFS4_CDFC4_FORE:
2274         case NFS4_CDFC4_BACK:
2275                 return nfs_ok;
2276         case NFS4_CDFC4_FORE_OR_BOTH:
2277         case NFS4_CDFC4_BACK_OR_BOTH:
2278                 *dir = NFS4_CDFC4_BOTH;
2279                 return nfs_ok;
2280         };
2281         return nfserr_inval;
2282 }
2283
2284 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2285 {
2286         struct nfsd4_session *session = cstate->session;
2287         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2288         __be32 status;
2289
2290         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2291         if (status)
2292                 return status;
2293         spin_lock(&nn->client_lock);
2294         session->se_cb_prog = bc->bc_cb_program;
2295         session->se_cb_sec = bc->bc_cb_sec;
2296         spin_unlock(&nn->client_lock);
2297
2298         nfsd4_probe_callback(session->se_client);
2299
2300         return nfs_ok;
2301 }
2302
2303 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2304                      struct nfsd4_compound_state *cstate,
2305                      struct nfsd4_bind_conn_to_session *bcts)
2306 {
2307         __be32 status;
2308         struct nfsd4_conn *conn;
2309         struct nfsd4_session *session;
2310         struct net *net = SVC_NET(rqstp);
2311         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2312
2313         if (!nfsd4_last_compound_op(rqstp))
2314                 return nfserr_not_only_op;
2315         nfs4_lock_state();
2316         spin_lock(&nn->client_lock);
2317         session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2318         spin_unlock(&nn->client_lock);
2319         if (!session)
2320                 goto out_no_session;
2321         status = nfserr_wrong_cred;
2322         if (!mach_creds_match(session->se_client, rqstp))
2323                 goto out;
2324         status = nfsd4_map_bcts_dir(&bcts->dir);
2325         if (status)
2326                 goto out;
2327         conn = alloc_conn(rqstp, bcts->dir);
2328         status = nfserr_jukebox;
2329         if (!conn)
2330                 goto out;
2331         nfsd4_init_conn(rqstp, conn, session);
2332         status = nfs_ok;
2333 out:
2334         nfsd4_put_session(session);
2335 out_no_session:
2336         nfs4_unlock_state();
2337         return status;
2338 }
2339
2340 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2341 {
2342         if (!session)
2343                 return 0;
2344         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2345 }
2346
2347 __be32
2348 nfsd4_destroy_session(struct svc_rqst *r,
2349                       struct nfsd4_compound_state *cstate,
2350                       struct nfsd4_destroy_session *sessionid)
2351 {
2352         struct nfsd4_session *ses;
2353         __be32 status;
2354         int ref_held_by_me = 0;
2355         struct net *net = SVC_NET(r);
2356         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2357
2358         nfs4_lock_state();
2359         status = nfserr_not_only_op;
2360         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2361                 if (!nfsd4_last_compound_op(r))
2362                         goto out;
2363                 ref_held_by_me++;
2364         }
2365         dump_sessionid(__func__, &sessionid->sessionid);
2366         spin_lock(&nn->client_lock);
2367         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2368         if (!ses)
2369                 goto out_client_lock;
2370         status = nfserr_wrong_cred;
2371         if (!mach_creds_match(ses->se_client, r))
2372                 goto out_put_session;
2373         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2374         if (status)
2375                 goto out_put_session;
2376         unhash_session(ses);
2377         spin_unlock(&nn->client_lock);
2378
2379         nfsd4_probe_callback_sync(ses->se_client);
2380
2381         spin_lock(&nn->client_lock);
2382         status = nfs_ok;
2383 out_put_session:
2384         nfsd4_put_session_locked(ses);
2385 out_client_lock:
2386         spin_unlock(&nn->client_lock);
2387 out:
2388         nfs4_unlock_state();
2389         return status;
2390 }
2391
2392 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2393 {
2394         struct nfsd4_conn *c;
2395
2396         list_for_each_entry(c, &s->se_conns, cn_persession) {
2397                 if (c->cn_xprt == xpt) {
2398                         return c;
2399                 }
2400         }
2401         return NULL;
2402 }
2403
2404 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2405 {
2406         struct nfs4_client *clp = ses->se_client;
2407         struct nfsd4_conn *c;
2408         __be32 status = nfs_ok;
2409         int ret;
2410
2411         spin_lock(&clp->cl_lock);
2412         c = __nfsd4_find_conn(new->cn_xprt, ses);
2413         if (c)
2414                 goto out_free;
2415         status = nfserr_conn_not_bound_to_session;
2416         if (clp->cl_mach_cred)
2417                 goto out_free;
2418         __nfsd4_hash_conn(new, ses);
2419         spin_unlock(&clp->cl_lock);
2420         ret = nfsd4_register_conn(new);
2421         if (ret)
2422                 /* oops; xprt is already down: */
2423                 nfsd4_conn_lost(&new->cn_xpt_user);
2424         return nfs_ok;
2425 out_free:
2426         spin_unlock(&clp->cl_lock);
2427         free_conn(new);
2428         return status;
2429 }
2430
2431 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2432 {
2433         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2434
2435         return args->opcnt > session->se_fchannel.maxops;
2436 }
2437
2438 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2439                                   struct nfsd4_session *session)
2440 {
2441         struct xdr_buf *xb = &rqstp->rq_arg;
2442
2443         return xb->len > session->se_fchannel.maxreq_sz;
2444 }
2445
2446 __be32
2447 nfsd4_sequence(struct svc_rqst *rqstp,
2448                struct nfsd4_compound_state *cstate,
2449                struct nfsd4_sequence *seq)
2450 {
2451         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2452         struct xdr_stream *xdr = &resp->xdr;
2453         struct nfsd4_session *session;
2454         struct nfs4_client *clp;
2455         struct nfsd4_slot *slot;
2456         struct nfsd4_conn *conn;
2457         __be32 status;
2458         int buflen;
2459         struct net *net = SVC_NET(rqstp);
2460         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2461
2462         if (resp->opcnt != 1)
2463                 return nfserr_sequence_pos;
2464
2465         /*
2466          * Will be either used or freed by nfsd4_sequence_check_conn
2467          * below.
2468          */
2469         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2470         if (!conn)
2471                 return nfserr_jukebox;
2472
2473         spin_lock(&nn->client_lock);
2474         session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
2475         if (!session)
2476                 goto out_no_session;
2477         clp = session->se_client;
2478
2479         status = nfserr_too_many_ops;
2480         if (nfsd4_session_too_many_ops(rqstp, session))
2481                 goto out_put_session;
2482
2483         status = nfserr_req_too_big;
2484         if (nfsd4_request_too_big(rqstp, session))
2485                 goto out_put_session;
2486
2487         status = nfserr_badslot;
2488         if (seq->slotid >= session->se_fchannel.maxreqs)
2489                 goto out_put_session;
2490
2491         slot = session->se_slots[seq->slotid];
2492         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2493
2494         /* We do not negotiate the number of slots yet, so set the
2495          * maxslots to the session maxreqs which is used to encode
2496          * sr_highest_slotid and the sr_target_slot id to maxslots */
2497         seq->maxslots = session->se_fchannel.maxreqs;
2498
2499         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2500                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2501         if (status == nfserr_replay_cache) {
2502                 status = nfserr_seq_misordered;
2503                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2504                         goto out_put_session;
2505                 cstate->slot = slot;
2506                 cstate->session = session;
2507                 cstate->clp = clp;
2508                 /* Return the cached reply status and set cstate->status
2509                  * for nfsd4_proc_compound processing */
2510                 status = nfsd4_replay_cache_entry(resp, seq);
2511                 cstate->status = nfserr_replay_cache;
2512                 goto out;
2513         }
2514         if (status)
2515                 goto out_put_session;
2516
2517         status = nfsd4_sequence_check_conn(conn, session);
2518         conn = NULL;
2519         if (status)
2520                 goto out_put_session;
2521
2522         buflen = (seq->cachethis) ?
2523                         session->se_fchannel.maxresp_cached :
2524                         session->se_fchannel.maxresp_sz;
2525         status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
2526                                     nfserr_rep_too_big;
2527         if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
2528                 goto out_put_session;
2529         svc_reserve(rqstp, buflen);
2530
2531         status = nfs_ok;
2532         /* Success! bump slot seqid */
2533         slot->sl_seqid = seq->seqid;
2534         slot->sl_flags |= NFSD4_SLOT_INUSE;
2535         if (seq->cachethis)
2536                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2537         else
2538                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2539
2540         cstate->slot = slot;
2541         cstate->session = session;
2542         cstate->clp = clp;
2543
2544 out:
2545         switch (clp->cl_cb_state) {
2546         case NFSD4_CB_DOWN:
2547                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2548                 break;
2549         case NFSD4_CB_FAULT:
2550                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2551                 break;
2552         default:
2553                 seq->status_flags = 0;
2554         }
2555         if (!list_empty(&clp->cl_revoked))
2556                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2557 out_no_session:
2558         if (conn)
2559                 free_conn(conn);
2560         spin_unlock(&nn->client_lock);
2561         return status;
2562 out_put_session:
2563         nfsd4_put_session_locked(session);
2564         goto out_no_session;
2565 }
2566
2567 void
2568 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
2569 {
2570         struct nfsd4_compound_state *cs = &resp->cstate;
2571
2572         if (nfsd4_has_session(cs)) {
2573                 if (cs->status != nfserr_replay_cache) {
2574                         nfsd4_store_cache_entry(resp);
2575                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
2576                 }
2577                 /* Drop session reference that was taken in nfsd4_sequence() */
2578                 nfsd4_put_session(cs->session);
2579         } else if (cs->clp)
2580                 put_client_renew(cs->clp);
2581 }
2582
2583 __be32
2584 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2585 {
2586         struct nfs4_client *conf, *unconf, *clp;
2587         __be32 status = 0;
2588         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2589
2590         nfs4_lock_state();
2591         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2592         conf = find_confirmed_client(&dc->clientid, true, nn);
2593         WARN_ON_ONCE(conf && unconf);
2594
2595         if (conf) {
2596                 clp = conf;
2597
2598                 if (client_has_state(conf)) {
2599                         status = nfserr_clientid_busy;
2600                         goto out;
2601                 }
2602         } else if (unconf)
2603                 clp = unconf;
2604         else {
2605                 status = nfserr_stale_clientid;
2606                 goto out;
2607         }
2608         if (!mach_creds_match(clp, rqstp)) {
2609                 status = nfserr_wrong_cred;
2610                 goto out;
2611         }
2612         expire_client(clp);
2613 out:
2614         nfs4_unlock_state();
2615         return status;
2616 }
2617
2618 __be32
2619 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2620 {
2621         __be32 status = 0;
2622
2623         if (rc->rca_one_fs) {
2624                 if (!cstate->current_fh.fh_dentry)
2625                         return nfserr_nofilehandle;
2626                 /*
2627                  * We don't take advantage of the rca_one_fs case.
2628                  * That's OK, it's optional, we can safely ignore it.
2629                  */
2630                  return nfs_ok;
2631         }
2632
2633         nfs4_lock_state();
2634         status = nfserr_complete_already;
2635         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2636                              &cstate->session->se_client->cl_flags))
2637                 goto out;
2638
2639         status = nfserr_stale_clientid;
2640         if (is_client_expired(cstate->session->se_client))
2641                 /*
2642                  * The following error isn't really legal.
2643                  * But we only get here if the client just explicitly
2644                  * destroyed the client.  Surely it no longer cares what
2645                  * error it gets back on an operation for the dead
2646                  * client.
2647                  */
2648                 goto out;
2649
2650         status = nfs_ok;
2651         nfsd4_client_record_create(cstate->session->se_client);
2652 out:
2653         nfs4_unlock_state();
2654         return status;
2655 }
2656
2657 __be32
2658 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2659                   struct nfsd4_setclientid *setclid)
2660 {
2661         struct xdr_netobj       clname = setclid->se_name;
2662         nfs4_verifier           clverifier = setclid->se_verf;
2663         struct nfs4_client      *conf, *unconf, *new;
2664         __be32                  status;
2665         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2666
2667         /* Cases below refer to rfc 3530 section 14.2.33: */
2668         nfs4_lock_state();
2669         conf = find_confirmed_client_by_name(&clname, nn);
2670         if (conf) {
2671                 /* case 0: */
2672                 status = nfserr_clid_inuse;
2673                 if (clp_used_exchangeid(conf))
2674                         goto out;
2675                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2676                         char addr_str[INET6_ADDRSTRLEN];
2677                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2678                                  sizeof(addr_str));
2679                         dprintk("NFSD: setclientid: string in use by client "
2680                                 "at %s\n", addr_str);
2681                         goto out;
2682                 }
2683         }
2684         unconf = find_unconfirmed_client_by_name(&clname, nn);
2685         if (unconf)
2686                 expire_client(unconf);
2687         status = nfserr_jukebox;
2688         new = create_client(clname, rqstp, &clverifier);
2689         if (new == NULL)
2690                 goto out;
2691         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2692                 /* case 1: probable callback update */
2693                 copy_clid(new, conf);
2694         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2695                 gen_clid(new, nn);
2696         new->cl_minorversion = 0;
2697         gen_callback(new, setclid, rqstp);
2698         add_to_unconfirmed(new);
2699         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2700         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2701         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2702         status = nfs_ok;
2703 out:
2704         nfs4_unlock_state();
2705         return status;
2706 }
2707
2708
2709 __be32
2710 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2711                          struct nfsd4_compound_state *cstate,
2712                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2713 {
2714         struct nfs4_client *conf, *unconf;
2715         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2716         clientid_t * clid = &setclientid_confirm->sc_clientid;
2717         __be32 status;
2718         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2719
2720         if (STALE_CLIENTID(clid, nn))
2721                 return nfserr_stale_clientid;
2722         nfs4_lock_state();
2723
2724         conf = find_confirmed_client(clid, false, nn);
2725         unconf = find_unconfirmed_client(clid, false, nn);
2726         /*
2727          * We try hard to give out unique clientid's, so if we get an
2728          * attempt to confirm the same clientid with a different cred,
2729          * there's a bug somewhere.  Let's charitably assume it's our
2730          * bug.
2731          */
2732         status = nfserr_serverfault;
2733         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2734                 goto out;
2735         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2736                 goto out;
2737         /* cases below refer to rfc 3530 section 14.2.34: */
2738         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2739                 if (conf && !unconf) /* case 2: probable retransmit */
2740                         status = nfs_ok;
2741                 else /* case 4: client hasn't noticed we rebooted yet? */
2742                         status = nfserr_stale_clientid;
2743                 goto out;
2744         }
2745         status = nfs_ok;
2746         if (conf) { /* case 1: callback update */
2747                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2748                 nfsd4_probe_callback(conf);
2749                 expire_client(unconf);
2750         } else { /* case 3: normal case; new or rebooted client */
2751                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2752                 if (conf) {
2753                         status = mark_client_expired(conf);
2754                         if (status)
2755                                 goto out;
2756                         expire_client(conf);
2757                 }
2758                 move_to_confirmed(unconf);
2759                 nfsd4_probe_callback(unconf);
2760         }
2761 out:
2762         nfs4_unlock_state();
2763         return status;
2764 }
2765
2766 static struct nfs4_file *nfsd4_alloc_file(void)
2767 {
2768         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2769 }
2770
2771 /* OPEN Share state helper functions */
2772 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2773 {
2774         unsigned int hashval = file_hashval(ino);
2775
2776         lockdep_assert_held(&state_lock);
2777
2778         atomic_set(&fp->fi_ref, 1);
2779         spin_lock_init(&fp->fi_lock);
2780         INIT_LIST_HEAD(&fp->fi_stateids);
2781         INIT_LIST_HEAD(&fp->fi_delegations);
2782         ihold(ino);
2783         fp->fi_inode = ino;
2784         fp->fi_had_conflict = false;
2785         fp->fi_lease = NULL;
2786         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2787         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2788         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2789 }
2790
2791 void
2792 nfsd4_free_slabs(void)
2793 {
2794         kmem_cache_destroy(openowner_slab);
2795         kmem_cache_destroy(lockowner_slab);
2796         kmem_cache_destroy(file_slab);
2797         kmem_cache_destroy(stateid_slab);
2798         kmem_cache_destroy(deleg_slab);
2799 }
2800
2801 int
2802 nfsd4_init_slabs(void)
2803 {
2804         openowner_slab = kmem_cache_create("nfsd4_openowners",
2805                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2806         if (openowner_slab == NULL)
2807                 goto out;
2808         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2809                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2810         if (lockowner_slab == NULL)
2811                 goto out_free_openowner_slab;
2812         file_slab = kmem_cache_create("nfsd4_files",
2813                         sizeof(struct nfs4_file), 0, 0, NULL);
2814         if (file_slab == NULL)
2815                 goto out_free_lockowner_slab;
2816         stateid_slab = kmem_cache_create("nfsd4_stateids",
2817                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2818         if (stateid_slab == NULL)
2819                 goto out_free_file_slab;
2820         deleg_slab = kmem_cache_create("nfsd4_delegations",
2821                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2822         if (deleg_slab == NULL)
2823                 goto out_free_stateid_slab;
2824         return 0;
2825
2826 out_free_stateid_slab:
2827         kmem_cache_destroy(stateid_slab);
2828 out_free_file_slab:
2829         kmem_cache_destroy(file_slab);
2830 out_free_lockowner_slab:
2831         kmem_cache_destroy(lockowner_slab);
2832 out_free_openowner_slab:
2833         kmem_cache_destroy(openowner_slab);
2834 out:
2835         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2836         return -ENOMEM;
2837 }
2838
2839 static void init_nfs4_replay(struct nfs4_replay *rp)
2840 {
2841         rp->rp_status = nfserr_serverfault;
2842         rp->rp_buflen = 0;
2843         rp->rp_buf = rp->rp_ibuf;
2844 }
2845
2846 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2847 {
2848         struct nfs4_stateowner *sop;
2849
2850         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2851         if (!sop)
2852                 return NULL;
2853
2854         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2855         if (!sop->so_owner.data) {
2856                 kmem_cache_free(slab, sop);
2857                 return NULL;
2858         }
2859         sop->so_owner.len = owner->len;
2860
2861         INIT_LIST_HEAD(&sop->so_stateids);
2862         sop->so_client = clp;
2863         init_nfs4_replay(&sop->so_replay);
2864         return sop;
2865 }
2866
2867 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2868 {
2869         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2870
2871         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2872         list_add(&oo->oo_perclient, &clp->cl_openowners);
2873 }
2874
2875 static struct nfs4_openowner *
2876 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
2877                            struct nfsd4_compound_state *cstate)
2878 {
2879         struct nfs4_client *clp = cstate->clp;
2880         struct nfs4_openowner *oo;
2881
2882         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2883         if (!oo)
2884                 return NULL;
2885         oo->oo_owner.so_is_open_owner = 1;
2886         oo->oo_owner.so_seqid = open->op_seqid;
2887         oo->oo_flags = NFS4_OO_NEW;
2888         if (nfsd4_has_session(cstate))
2889                 oo->oo_flags |= NFS4_OO_CONFIRMED;
2890         oo->oo_time = 0;
2891         oo->oo_last_closed_stid = NULL;
2892         INIT_LIST_HEAD(&oo->oo_close_lru);
2893         hash_openowner(oo, clp, strhashval);
2894         return oo;
2895 }
2896
2897 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2898         struct nfs4_openowner *oo = open->op_openowner;
2899
2900         stp->st_stid.sc_type = NFS4_OPEN_STID;
2901         INIT_LIST_HEAD(&stp->st_locks);
2902         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2903         stp->st_stateowner = &oo->oo_owner;
2904         get_nfs4_file(fp);
2905         stp->st_file = fp;
2906         stp->st_access_bmap = 0;
2907         stp->st_deny_bmap = 0;
2908         set_access(open->op_share_access, stp);
2909         set_deny(open->op_share_deny, stp);
2910         stp->st_openstp = NULL;
2911         spin_lock(&fp->fi_lock);
2912         list_add(&stp->st_perfile, &fp->fi_stateids);
2913         spin_unlock(&fp->fi_lock);
2914 }
2915
2916 static void
2917 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2918 {
2919         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2920
2921         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2922
2923         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2924         oo->oo_time = get_seconds();
2925 }
2926
2927 static int
2928 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2929                                                         clientid_t *clid)
2930 {
2931         return (sop->so_owner.len == owner->len) &&
2932                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2933                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2934 }
2935
2936 static struct nfs4_openowner *
2937 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2938                         bool sessions, struct nfsd_net *nn)
2939 {
2940         struct nfs4_stateowner *so;
2941         struct nfs4_openowner *oo;
2942         struct nfs4_client *clp;
2943
2944         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2945                 if (!so->so_is_open_owner)
2946                         continue;
2947                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2948                         oo = openowner(so);
2949                         clp = oo->oo_owner.so_client;
2950                         if ((bool)clp->cl_minorversion != sessions)
2951                                 return NULL;
2952                         renew_client(oo->oo_owner.so_client);
2953                         return oo;
2954                 }
2955         }
2956         return NULL;
2957 }
2958
2959 /* search file_hashtbl[] for file */
2960 static struct nfs4_file *
2961 find_file_locked(struct inode *ino)
2962 {
2963         unsigned int hashval = file_hashval(ino);
2964         struct nfs4_file *fp;
2965
2966         lockdep_assert_held(&state_lock);
2967
2968         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2969                 if (fp->fi_inode == ino) {
2970                         get_nfs4_file(fp);
2971                         return fp;
2972                 }
2973         }
2974         return NULL;
2975 }
2976
2977 static struct nfs4_file *
2978 find_file(struct inode *ino)
2979 {
2980         struct nfs4_file *fp;
2981
2982         spin_lock(&state_lock);
2983         fp = find_file_locked(ino);
2984         spin_unlock(&state_lock);
2985         return fp;
2986 }
2987
2988 static struct nfs4_file *
2989 find_or_add_file(struct inode *ino, struct nfs4_file *new)
2990 {
2991         struct nfs4_file *fp;
2992
2993         spin_lock(&state_lock);
2994         fp = find_file_locked(ino);
2995         if (fp == NULL) {
2996                 nfsd4_init_file(new, ino);
2997                 fp = new;
2998         }
2999         spin_unlock(&state_lock);
3000
3001         return fp;
3002 }
3003
3004 /*
3005  * Called to check deny when READ with all zero stateid or
3006  * WRITE with all zero or all one stateid
3007  */
3008 static __be32
3009 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3010 {
3011         struct inode *ino = current_fh->fh_dentry->d_inode;
3012         struct nfs4_file *fp;
3013         struct nfs4_ol_stateid *stp;
3014         __be32 ret;
3015
3016         fp = find_file(ino);
3017         if (!fp)
3018                 return nfs_ok;
3019         ret = nfserr_locked;
3020         /* Search for conflicting share reservations */
3021         spin_lock(&fp->fi_lock);
3022         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
3023                 if (test_deny(deny_type, stp) ||
3024                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
3025                         goto out;
3026         }
3027         ret = nfs_ok;
3028 out:
3029         spin_unlock(&fp->fi_lock);
3030         put_nfs4_file(fp);
3031         return ret;
3032 }
3033
3034 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3035 {
3036         struct nfs4_client *clp = dp->dl_stid.sc_client;
3037         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3038
3039         lockdep_assert_held(&state_lock);
3040         /* We're assuming the state code never drops its reference
3041          * without first removing the lease.  Since we're in this lease
3042          * callback (and since the lease code is serialized by the kernel
3043          * lock) we know the server hasn't removed the lease yet, we know
3044          * it's safe to take a reference: */
3045         atomic_inc(&dp->dl_count);
3046
3047         /*
3048          * If the dl_time != 0, then we know that it has already been
3049          * queued for a lease break. Don't queue it again.
3050          */
3051         if (dp->dl_time == 0) {
3052                 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3053                 dp->dl_time = get_seconds();
3054         }
3055
3056         block_delegations(&dp->dl_fh);
3057
3058         nfsd4_cb_recall(dp);
3059 }
3060
3061 /* Called from break_lease() with i_lock held. */
3062 static void nfsd_break_deleg_cb(struct file_lock *fl)
3063 {
3064         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
3065         struct nfs4_delegation *dp;
3066
3067         if (!fp) {
3068                 WARN(1, "(%p)->fl_owner NULL\n", fl);
3069                 return;
3070         }
3071         if (fp->fi_had_conflict) {
3072                 WARN(1, "duplicate break on %p\n", fp);
3073                 return;
3074         }
3075         /*
3076          * We don't want the locks code to timeout the lease for us;
3077          * we'll remove it ourself if a delegation isn't returned
3078          * in time:
3079          */
3080         fl->fl_break_time = 0;
3081
3082         spin_lock(&state_lock);
3083         fp->fi_had_conflict = true;
3084         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
3085                 nfsd_break_one_deleg(dp);
3086         spin_unlock(&state_lock);
3087 }
3088
3089 static
3090 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
3091 {
3092         if (arg & F_UNLCK)
3093                 return lease_modify(onlist, arg);
3094         else
3095                 return -EAGAIN;
3096 }
3097
3098 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3099         .lm_break = nfsd_break_deleg_cb,
3100         .lm_change = nfsd_change_deleg_cb,
3101 };
3102
3103 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3104 {
3105         if (nfsd4_has_session(cstate))
3106                 return nfs_ok;
3107         if (seqid == so->so_seqid - 1)
3108                 return nfserr_replay_me;
3109         if (seqid == so->so_seqid)
3110                 return nfs_ok;
3111         return nfserr_bad_seqid;
3112 }
3113
3114 static __be32 lookup_clientid(clientid_t *clid,
3115                 struct nfsd4_compound_state *cstate,
3116                 struct nfsd_net *nn)
3117 {
3118         struct nfs4_client *found;
3119
3120         if (cstate->clp) {
3121                 found = cstate->clp;
3122                 if (!same_clid(&found->cl_clientid, clid))
3123                         return nfserr_stale_clientid;
3124                 return nfs_ok;
3125         }
3126
3127         if (STALE_CLIENTID(clid, nn))
3128                 return nfserr_stale_clientid;
3129
3130         /*
3131          * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
3132          * cached already then we know this is for is for v4.0 and "sessions"
3133          * will be false.
3134          */
3135         WARN_ON_ONCE(cstate->session);
3136         found = find_confirmed_client(clid, false, nn);
3137         if (!found)
3138                 return nfserr_expired;
3139
3140         /* Cache the nfs4_client in cstate! */
3141         cstate->clp = found;
3142         atomic_inc(&found->cl_refcount);
3143         return nfs_ok;
3144 }
3145
3146 __be32
3147 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
3148                     struct nfsd4_open *open, struct nfsd_net *nn)
3149 {
3150         clientid_t *clientid = &open->op_clientid;
3151         struct nfs4_client *clp = NULL;
3152         unsigned int strhashval;
3153         struct nfs4_openowner *oo = NULL;
3154         __be32 status;
3155
3156         if (STALE_CLIENTID(&open->op_clientid, nn))
3157                 return nfserr_stale_clientid;
3158         /*
3159          * In case we need it later, after we've already created the
3160          * file and don't want to risk a further failure:
3161          */
3162         open->op_file = nfsd4_alloc_file();
3163         if (open->op_file == NULL)
3164                 return nfserr_jukebox;
3165
3166         status = lookup_clientid(clientid, cstate, nn);
3167         if (status)
3168                 return status;
3169         clp = cstate->clp;
3170
3171         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
3172         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
3173         open->op_openowner = oo;
3174         if (!oo) {
3175                 goto new_owner;
3176         }
3177         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
3178                 /* Replace unconfirmed owners without checking for replay. */
3179                 release_openowner(oo);
3180                 open->op_openowner = NULL;
3181                 goto new_owner;
3182         }
3183         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
3184         if (status)
3185                 return status;
3186         goto alloc_stateid;
3187 new_owner:
3188         oo = alloc_init_open_stateowner(strhashval, open, cstate);
3189         if (oo == NULL)
3190                 return nfserr_jukebox;
3191         open->op_openowner = oo;
3192 alloc_stateid:
3193         open->op_stp = nfs4_alloc_stateid(clp);
3194         if (!open->op_stp)
3195                 return nfserr_jukebox;
3196         return nfs_ok;
3197 }
3198
3199 static inline __be32
3200 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
3201 {
3202         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
3203                 return nfserr_openmode;
3204         else
3205                 return nfs_ok;
3206 }
3207
3208 static int share_access_to_flags(u32 share_access)
3209 {
3210         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
3211 }
3212
3213 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
3214 {
3215         struct nfs4_stid *ret;
3216
3217         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
3218         if (!ret)
3219                 return NULL;
3220         return delegstateid(ret);
3221 }
3222
3223 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
3224 {
3225         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
3226                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
3227 }
3228
3229 static __be32
3230 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
3231                 struct nfs4_delegation **dp)
3232 {
3233         int flags;
3234         __be32 status = nfserr_bad_stateid;
3235
3236         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
3237         if (*dp == NULL)
3238                 goto out;
3239         flags = share_access_to_flags(open->op_share_access);
3240         status = nfs4_check_delegmode(*dp, flags);
3241         if (status)
3242                 *dp = NULL;
3243 out:
3244         if (!nfsd4_is_deleg_cur(open))
3245                 return nfs_ok;
3246         if (status)
3247                 return status;
3248         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3249         return nfs_ok;
3250 }
3251
3252 static __be32
3253 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
3254 {
3255         struct nfs4_ol_stateid *local;
3256         struct nfs4_openowner *oo = open->op_openowner;
3257
3258         spin_lock(&fp->fi_lock);
3259         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3260                 /* ignore lock owners */
3261                 if (local->st_stateowner->so_is_open_owner == 0)
3262                         continue;
3263                 /* remember if we have seen this open owner */
3264                 if (local->st_stateowner == &oo->oo_owner)
3265                         *stpp = local;
3266                 /* check for conflicting share reservations */
3267                 if (!test_share(local, open)) {
3268                         spin_unlock(&fp->fi_lock);
3269                         return nfserr_share_denied;
3270                 }
3271         }
3272         spin_unlock(&fp->fi_lock);
3273         return nfs_ok;
3274 }
3275
3276 static inline int nfs4_access_to_access(u32 nfs4_access)
3277 {
3278         int flags = 0;
3279
3280         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
3281                 flags |= NFSD_MAY_READ;
3282         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
3283                 flags |= NFSD_MAY_WRITE;
3284         return flags;
3285 }
3286
3287 static inline __be32
3288 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
3289                 struct nfsd4_open *open)
3290 {
3291         struct iattr iattr = {
3292                 .ia_valid = ATTR_SIZE,
3293                 .ia_size = 0,
3294         };
3295         if (!open->op_truncate)
3296                 return 0;
3297         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
3298                 return nfserr_inval;
3299         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
3300 }
3301
3302 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
3303                 struct svc_fh *cur_fh, struct nfsd4_open *open)
3304 {
3305         struct file *filp = NULL;
3306         __be32 status;
3307         int oflag = nfs4_access_to_omode(open->op_share_access);
3308         int access = nfs4_access_to_access(open->op_share_access);
3309
3310         spin_lock(&fp->fi_lock);
3311         if (!fp->fi_fds[oflag]) {
3312                 spin_unlock(&fp->fi_lock);
3313                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
3314                 if (status)
3315                         goto out;
3316                 spin_lock(&fp->fi_lock);
3317                 if (!fp->fi_fds[oflag]) {
3318                         fp->fi_fds[oflag] = filp;
3319                         filp = NULL;
3320                 }
3321         }
3322         status = nfs4_file_get_access(fp, open->op_share_access);
3323         spin_unlock(&fp->fi_lock);
3324         if (filp)
3325                 fput(filp);
3326         if (status)
3327                 goto out_put_access;
3328
3329         status = nfsd4_truncate(rqstp, cur_fh, open);
3330         if (status)
3331                 goto out_put_access;
3332
3333         return nfs_ok;
3334
3335 out_put_access:
3336         nfs4_file_put_access(fp, open->op_share_access);
3337 out:
3338         return status;
3339 }
3340
3341 static __be32
3342 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)
3343 {
3344         u32 op_share_access = open->op_share_access;
3345         __be32 status;
3346
3347         if (!test_access(op_share_access, stp))
3348                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
3349         else
3350                 status = nfsd4_truncate(rqstp, cur_fh, open);
3351
3352         if (status)
3353                 return status;
3354
3355         /* remember the open */
3356         set_access(op_share_access, stp);
3357         set_deny(open->op_share_deny, stp);
3358         return nfs_ok;
3359 }
3360
3361
3362 static void
3363 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3364 {
3365         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3366 }
3367
3368 /* Should we give out recallable state?: */
3369 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3370 {
3371         if (clp->cl_cb_state == NFSD4_CB_UP)
3372                 return true;
3373         /*
3374          * In the sessions case, since we don't have to establish a
3375          * separate connection for callbacks, we assume it's OK
3376          * until we hear otherwise:
3377          */
3378         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3379 }
3380
3381 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3382 {
3383         struct file_lock *fl;
3384
3385         fl = locks_alloc_lock();
3386         if (!fl)
3387                 return NULL;
3388         locks_init_lock(fl);
3389         fl->fl_lmops = &nfsd_lease_mng_ops;
3390         fl->fl_flags = FL_DELEG;
3391         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3392         fl->fl_end = OFFSET_MAX;
3393         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3394         fl->fl_pid = current->tgid;
3395         return fl;
3396 }
3397
3398 static int nfs4_setlease(struct nfs4_delegation *dp)
3399 {
3400         struct nfs4_file *fp = dp->dl_file;
3401         struct file_lock *fl;
3402         int status;
3403
3404         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3405         if (!fl)
3406                 return -ENOMEM;
3407         fl->fl_file = find_readable_file(fp);
3408         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3409         if (status)
3410                 goto out_free;
3411         fp->fi_lease = fl;
3412         fp->fi_deleg_file = fl->fl_file;
3413         atomic_set(&fp->fi_delegees, 1);
3414         spin_lock(&state_lock);
3415         hash_delegation_locked(dp, fp);
3416         spin_unlock(&state_lock);
3417         return 0;
3418 out_free:
3419         if (fl->fl_file)
3420                 fput(fl->fl_file);
3421         locks_free_lock(fl);
3422         return status;
3423 }
3424
3425 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3426 {
3427         if (fp->fi_had_conflict)
3428                 return -EAGAIN;
3429         get_nfs4_file(fp);
3430         dp->dl_file = fp;
3431         if (!fp->fi_lease)
3432                 return nfs4_setlease(dp);
3433         spin_lock(&state_lock);
3434         atomic_inc(&fp->fi_delegees);
3435         if (fp->fi_had_conflict) {
3436                 spin_unlock(&state_lock);
3437                 return -EAGAIN;
3438         }
3439         hash_delegation_locked(dp, fp);
3440         spin_unlock(&state_lock);
3441         return 0;
3442 }
3443
3444 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3445 {
3446         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3447         if (status == -EAGAIN)
3448                 open->op_why_no_deleg = WND4_CONTENTION;
3449         else {
3450                 open->op_why_no_deleg = WND4_RESOURCE;
3451                 switch (open->op_deleg_want) {
3452                 case NFS4_SHARE_WANT_READ_DELEG:
3453                 case NFS4_SHARE_WANT_WRITE_DELEG:
3454                 case NFS4_SHARE_WANT_ANY_DELEG:
3455                         break;
3456                 case NFS4_SHARE_WANT_CANCEL:
3457                         open->op_why_no_deleg = WND4_CANCELLED;
3458                         break;
3459                 case NFS4_SHARE_WANT_NO_DELEG:
3460                         WARN_ON_ONCE(1);
3461                 }
3462         }
3463 }
3464
3465 /*
3466  * Attempt to hand out a delegation.
3467  *
3468  * Note we don't support write delegations, and won't until the vfs has
3469  * proper support for them.
3470  */
3471 static void
3472 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3473                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3474 {
3475         struct nfs4_delegation *dp;
3476         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3477         int cb_up;
3478         int status = 0;
3479
3480         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3481         open->op_recall = 0;
3482         switch (open->op_claim_type) {
3483                 case NFS4_OPEN_CLAIM_PREVIOUS:
3484                         if (!cb_up)
3485                                 open->op_recall = 1;
3486                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3487                                 goto out_no_deleg;
3488                         break;
3489                 case NFS4_OPEN_CLAIM_NULL:
3490                 case NFS4_OPEN_CLAIM_FH:
3491                         /*
3492                          * Let's not give out any delegations till everyone's
3493                          * had the chance to reclaim theirs....
3494                          */
3495                         if (locks_in_grace(net))
3496                                 goto out_no_deleg;
3497                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3498                                 goto out_no_deleg;
3499                         /*
3500                          * Also, if the file was opened for write or
3501                          * create, there's a good chance the client's
3502                          * about to write to it, resulting in an
3503                          * immediate recall (since we don't support
3504                          * write delegations):
3505                          */
3506                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3507                                 goto out_no_deleg;
3508                         if (open->op_create == NFS4_OPEN_CREATE)
3509                                 goto out_no_deleg;
3510                         break;
3511                 default:
3512                         goto out_no_deleg;
3513         }
3514         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3515         if (dp == NULL)
3516                 goto out_no_deleg;
3517         status = nfs4_set_delegation(dp, stp->st_file);
3518         if (status)
3519                 goto out_free;
3520
3521         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3522
3523         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3524                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3525         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3526         return;
3527 out_free:
3528         destroy_delegation(dp);
3529 out_no_deleg:
3530         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3531         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3532             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3533                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3534                 open->op_recall = 1;
3535         }
3536
3537         /* 4.1 client asking for a delegation? */
3538         if (open->op_deleg_want)
3539                 nfsd4_open_deleg_none_ext(open, status);
3540         return;
3541 }
3542
3543 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3544                                         struct nfs4_delegation *dp)
3545 {
3546         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3547             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3548                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3549                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3550         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3551                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3552                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3553                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3554         }
3555         /* Otherwise the client must be confused wanting a delegation
3556          * it already has, therefore we don't return
3557          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3558          */
3559 }
3560
3561 /*
3562  * called with nfs4_lock_state() held.
3563  */
3564 __be32
3565 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3566 {
3567         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3568         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3569         struct nfs4_file *fp = NULL;
3570         struct inode *ino = current_fh->fh_dentry->d_inode;
3571         struct nfs4_ol_stateid *stp = NULL;
3572         struct nfs4_delegation *dp = NULL;
3573         __be32 status;
3574
3575         /*
3576          * Lookup file; if found, lookup stateid and check open request,
3577          * and check for delegations in the process of being recalled.
3578          * If not found, create the nfs4_file struct
3579          */
3580         fp = find_or_add_file(ino, open->op_file);
3581         if (fp != open->op_file) {
3582                 if ((status = nfs4_check_open(fp, open, &stp)))
3583                         goto out;
3584                 status = nfs4_check_deleg(cl, open, &dp);
3585                 if (status)
3586                         goto out;
3587         } else {
3588                 open->op_file = NULL;
3589                 status = nfserr_bad_stateid;
3590                 if (nfsd4_is_deleg_cur(open))
3591                         goto out;
3592                 status = nfserr_jukebox;
3593         }
3594
3595         /*
3596          * OPEN the file, or upgrade an existing OPEN.
3597          * If truncate fails, the OPEN fails.
3598          */
3599         if (stp) {
3600                 /* Stateid was found, this is an OPEN upgrade */
3601                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3602                 if (status)
3603                         goto out;
3604         } else {
3605                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3606                 if (status)
3607                         goto out;
3608                 stp = open->op_stp;
3609                 open->op_stp = NULL;
3610                 init_open_stateid(stp, fp, open);
3611         }
3612         update_stateid(&stp->st_stid.sc_stateid);
3613         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3614
3615         if (nfsd4_has_session(&resp->cstate)) {
3616                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3617                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3618                         open->op_why_no_deleg = WND4_NOT_WANTED;
3619                         goto nodeleg;
3620                 }
3621         }
3622
3623         /*
3624         * Attempt to hand out a delegation. No error return, because the
3625         * OPEN succeeds even if we fail.
3626         */
3627         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3628 nodeleg:
3629         status = nfs_ok;
3630
3631         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3632                 STATEID_VAL(&stp->st_stid.sc_stateid));
3633 out:
3634         /* 4.1 client trying to upgrade/downgrade delegation? */
3635         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3636             open->op_deleg_want)
3637                 nfsd4_deleg_xgrade_none_ext(open, dp);
3638
3639         if (fp)
3640                 put_nfs4_file(fp);
3641         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3642                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3643         /*
3644         * To finish the open response, we just need to set the rflags.
3645         */
3646         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3647         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3648             !nfsd4_has_session(&resp->cstate))
3649                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3650
3651         return status;
3652 }
3653
3654 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3655 {
3656         if (open->op_openowner) {
3657                 struct nfs4_openowner *oo = open->op_openowner;
3658
3659                 if (!list_empty(&oo->oo_owner.so_stateids))
3660                         list_del_init(&oo->oo_close_lru);
3661                 if (oo->oo_flags & NFS4_OO_NEW) {
3662                         if (status) {
3663                                 release_openowner(oo);
3664                                 open->op_openowner = NULL;
3665                         } else
3666                                 oo->oo_flags &= ~NFS4_OO_NEW;
3667                 }
3668         }
3669         if (open->op_file)
3670                 nfsd4_free_file(open->op_file);
3671         if (open->op_stp)
3672                 free_generic_stateid(open->op_stp);
3673 }
3674
3675 __be32
3676 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3677             clientid_t *clid)
3678 {
3679         struct nfs4_client *clp;
3680         __be32 status;
3681         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3682
3683         nfs4_lock_state();
3684         dprintk("process_renew(%08x/%08x): starting\n",
3685                         clid->cl_boot, clid->cl_id);
3686         status = lookup_clientid(clid, cstate, nn);
3687         if (status)
3688                 goto out;
3689         clp = cstate->clp;
3690         status = nfserr_cb_path_down;
3691         if (!list_empty(&clp->cl_delegations)
3692                         && clp->cl_cb_state != NFSD4_CB_UP)
3693                 goto out;
3694         status = nfs_ok;
3695 out:
3696         nfs4_unlock_state();
3697         return status;
3698 }
3699
3700 static void
3701 nfsd4_end_grace(struct nfsd_net *nn)
3702 {
3703         /* do nothing if grace period already ended */
3704         if (nn->grace_ended)
3705                 return;
3706
3707         dprintk("NFSD: end of grace period\n");
3708         nn->grace_ended = true;
3709         nfsd4_record_grace_done(nn, nn->boot_time);
3710         locks_end_grace(&nn->nfsd4_manager);
3711         /*
3712          * Now that every NFSv4 client has had the chance to recover and
3713          * to see the (possibly new, possibly shorter) lease time, we
3714          * can safely set the next grace time to the current lease time:
3715          */
3716         nn->nfsd4_grace = nn->nfsd4_lease;
3717 }
3718
3719 static time_t
3720 nfs4_laundromat(struct nfsd_net *nn)
3721 {
3722         struct nfs4_client *clp;
3723         struct nfs4_openowner *oo;
3724         struct nfs4_delegation *dp;
3725         struct list_head *pos, *next, reaplist;
3726         time_t cutoff = get_seconds() - nn->nfsd4_lease;
3727         time_t t, new_timeo = nn->nfsd4_lease;
3728
3729         nfs4_lock_state();
3730
3731         dprintk("NFSD: laundromat service - starting\n");
3732         nfsd4_end_grace(nn);
3733         INIT_LIST_HEAD(&reaplist);
3734         spin_lock(&nn->client_lock);
3735         list_for_each_safe(pos, next, &nn->client_lru) {
3736                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3737                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3738                         t = clp->cl_time - cutoff;
3739                         new_timeo = min(new_timeo, t);
3740                         break;
3741                 }
3742                 if (mark_client_expired_locked(clp)) {
3743                         dprintk("NFSD: client in use (clientid %08x)\n",
3744                                 clp->cl_clientid.cl_id);
3745                         continue;
3746                 }
3747                 list_move(&clp->cl_lru, &reaplist);
3748         }
3749         spin_unlock(&nn->client_lock);
3750         list_for_each_safe(pos, next, &reaplist) {
3751                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3752                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3753                         clp->cl_clientid.cl_id);
3754                 expire_client(clp);
3755         }
3756         spin_lock(&state_lock);
3757         list_for_each_safe(pos, next, &nn->del_recall_lru) {
3758                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3759                 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3760                         continue;
3761                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3762                         t = dp->dl_time - cutoff;
3763                         new_timeo = min(new_timeo, t);
3764                         break;
3765                 }
3766                 list_move(&dp->dl_recall_lru, &reaplist);
3767         }
3768         spin_unlock(&state_lock);
3769         list_for_each_safe(pos, next, &reaplist) {
3770                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3771                 revoke_delegation(dp);
3772         }
3773         list_for_each_safe(pos, next, &nn->close_lru) {
3774                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3775                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3776                         t = oo->oo_time - cutoff;
3777                         new_timeo = min(new_timeo, t);
3778                         break;
3779                 }
3780                 release_openowner(oo);
3781         }
3782         new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
3783         nfs4_unlock_state();
3784         return new_timeo;
3785 }
3786
3787 static struct workqueue_struct *laundry_wq;
3788 static void laundromat_main(struct work_struct *);
3789
3790 static void
3791 laundromat_main(struct work_struct *laundry)
3792 {
3793         time_t t;
3794         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3795                                                   work);
3796         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3797                                            laundromat_work);
3798
3799         t = nfs4_laundromat(nn);
3800         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3801         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3802 }
3803
3804 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3805 {
3806         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3807                 return nfserr_bad_stateid;
3808         return nfs_ok;
3809 }
3810
3811 static inline int
3812 access_permit_read(struct nfs4_ol_stateid *stp)
3813 {
3814         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3815                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3816                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3817 }
3818
3819 static inline int
3820 access_permit_write(struct nfs4_ol_stateid *stp)
3821 {
3822         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3823                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3824 }
3825
3826 static
3827 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3828 {
3829         __be32 status = nfserr_openmode;
3830
3831         /* For lock stateid's, we test the parent open, not the lock: */
3832         if (stp->st_openstp)
3833                 stp = stp->st_openstp;
3834         if ((flags & WR_STATE) && !access_permit_write(stp))
3835                 goto out;
3836         if ((flags & RD_STATE) && !access_permit_read(stp))
3837                 goto out;
3838         status = nfs_ok;
3839 out:
3840         return status;
3841 }
3842
3843 static inline __be32
3844 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3845 {
3846         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3847                 return nfs_ok;
3848         else if (locks_in_grace(net)) {
3849                 /* Answer in remaining cases depends on existence of
3850                  * conflicting state; so we must wait out the grace period. */
3851                 return nfserr_grace;
3852         } else if (flags & WR_STATE)
3853                 return nfs4_share_conflict(current_fh,
3854                                 NFS4_SHARE_DENY_WRITE);
3855         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3856                 return nfs4_share_conflict(current_fh,
3857                                 NFS4_SHARE_DENY_READ);
3858 }
3859
3860 /*
3861  * Allow READ/WRITE during grace period on recovered state only for files
3862  * that are not able to provide mandatory locking.
3863  */
3864 static inline int
3865 grace_disallows_io(struct net *net, struct inode *inode)
3866 {
3867         return locks_in_grace(net) && mandatory_lock(inode);
3868 }
3869
3870 /* Returns true iff a is later than b: */
3871 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3872 {
3873         return (s32)(a->si_generation - b->si_generation) > 0;
3874 }
3875
3876 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3877 {
3878         /*
3879          * When sessions are used the stateid generation number is ignored
3880          * when it is zero.
3881          */
3882         if (has_session && in->si_generation == 0)
3883                 return nfs_ok;
3884
3885         if (in->si_generation == ref->si_generation)
3886                 return nfs_ok;
3887
3888         /* If the client sends us a stateid from the future, it's buggy: */
3889         if (stateid_generation_after(in, ref))
3890                 return nfserr_bad_stateid;
3891         /*
3892          * However, we could see a stateid from the past, even from a
3893          * non-buggy client.  For example, if the client sends a lock
3894          * while some IO is outstanding, the lock may bump si_generation
3895          * while the IO is still in flight.  The client could avoid that
3896          * situation by waiting for responses on all the IO requests,
3897          * but better performance may result in retrying IO that
3898          * receives an old_stateid error if requests are rarely
3899          * reordered in flight:
3900          */
3901         return nfserr_old_stateid;
3902 }
3903
3904 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3905 {
3906         struct nfs4_stid *s;
3907         struct nfs4_ol_stateid *ols;
3908         __be32 status;
3909
3910         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3911                 return nfserr_bad_stateid;
3912         /* Client debugging aid. */
3913         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3914                 char addr_str[INET6_ADDRSTRLEN];
3915                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3916                                  sizeof(addr_str));
3917                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3918                                         "with incorrect client ID\n", addr_str);
3919                 return nfserr_bad_stateid;
3920         }
3921         s = find_stateid(cl, stateid);
3922         if (!s)
3923                 return nfserr_bad_stateid;
3924         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3925         if (status)
3926                 return status;
3927         switch (s->sc_type) {
3928         case NFS4_DELEG_STID:
3929                 return nfs_ok;
3930         case NFS4_REVOKED_DELEG_STID:
3931                 return nfserr_deleg_revoked;
3932         case NFS4_OPEN_STID:
3933         case NFS4_LOCK_STID:
3934                 ols = openlockstateid(s);
3935                 if (ols->st_stateowner->so_is_open_owner
3936                                 && !(openowner(ols->st_stateowner)->oo_flags
3937                                                 & NFS4_OO_CONFIRMED))
3938                         return nfserr_bad_stateid;
3939                 return nfs_ok;
3940         default:
3941                 printk("unknown stateid type %x\n", s->sc_type);
3942         case NFS4_CLOSED_STID:
3943                 return nfserr_bad_stateid;
3944         }
3945 }
3946
3947 static __be32
3948 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
3949                      stateid_t *stateid, unsigned char typemask,
3950                      struct nfs4_stid **s, struct nfsd_net *nn)
3951 {
3952         __be32 status;
3953
3954         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3955                 return nfserr_bad_stateid;
3956         status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
3957         if (status == nfserr_stale_clientid) {
3958                 if (cstate->session)
3959                         return nfserr_bad_stateid;
3960                 return nfserr_stale_stateid;
3961         }
3962         if (status)
3963                 return status;
3964         *s = find_stateid_by_type(cstate->clp, stateid, typemask);
3965         if (!*s)
3966                 return nfserr_bad_stateid;
3967         return nfs_ok;
3968 }
3969
3970 /*
3971 * Checks for stateid operations
3972 */
3973 __be32
3974 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3975                            stateid_t *stateid, int flags, struct file **filpp)
3976 {
3977         struct nfs4_stid *s;
3978         struct nfs4_ol_stateid *stp = NULL;
3979         struct nfs4_delegation *dp = NULL;
3980         struct svc_fh *current_fh = &cstate->current_fh;
3981         struct inode *ino = current_fh->fh_dentry->d_inode;
3982         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3983         struct file *file = NULL;
3984         __be32 status;
3985
3986         if (filpp)
3987                 *filpp = NULL;
3988
3989         if (grace_disallows_io(net, ino))
3990                 return nfserr_grace;
3991
3992         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3993                 return check_special_stateids(net, current_fh, stateid, flags);
3994
3995         nfs4_lock_state();
3996
3997         status = nfsd4_lookup_stateid(cstate, stateid,
3998                                 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3999                                 &s, nn);
4000         if (status)
4001                 goto out;
4002         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
4003         if (status)
4004                 goto out;
4005         switch (s->sc_type) {
4006         case NFS4_DELEG_STID:
4007                 dp = delegstateid(s);
4008                 status = nfs4_check_delegmode(dp, flags);
4009                 if (status)
4010                         goto out;
4011                 if (filpp) {
4012                         file = dp->dl_file->fi_deleg_file;
4013                         if (!file) {
4014                                 WARN_ON_ONCE(1);
4015                                 status = nfserr_serverfault;
4016                                 goto out;
4017                         }
4018                         get_file(file);
4019                 }
4020                 break;
4021         case NFS4_OPEN_STID:
4022         case NFS4_LOCK_STID:
4023                 stp = openlockstateid(s);
4024                 status = nfs4_check_fh(current_fh, stp);
4025                 if (status)
4026                         goto out;
4027                 if (stp->st_stateowner->so_is_open_owner
4028                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4029                         goto out;
4030                 status = nfs4_check_openmode(stp, flags);
4031                 if (status)
4032                         goto out;
4033                 if (filpp) {
4034                         if (flags & RD_STATE)
4035                                 file = find_readable_file(stp->st_file);
4036                         else
4037                                 file = find_writeable_file(stp->st_file);
4038                 }
4039                 break;
4040         default:
4041                 status = nfserr_bad_stateid;
4042                 goto out;
4043         }
4044         status = nfs_ok;
4045         if (file)
4046                 *filpp = file;
4047 out:
4048         nfs4_unlock_state();
4049         return status;
4050 }
4051
4052 static __be32
4053 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
4054 {
4055         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
4056
4057         if (check_for_locks(stp->st_file, lo))
4058                 return nfserr_locks_held;
4059         release_lockowner_if_empty(lo);
4060         return nfs_ok;
4061 }
4062
4063 /*
4064  * Test if the stateid is valid
4065  */
4066 __be32
4067 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4068                    struct nfsd4_test_stateid *test_stateid)
4069 {
4070         struct nfsd4_test_stateid_id *stateid;
4071         struct nfs4_client *cl = cstate->session->se_client;
4072
4073         nfs4_lock_state();
4074         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
4075                 stateid->ts_id_status =
4076                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
4077         nfs4_unlock_state();
4078
4079         return nfs_ok;
4080 }
4081
4082 __be32
4083 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4084                    struct nfsd4_free_stateid *free_stateid)
4085 {
4086         stateid_t *stateid = &free_stateid->fr_stateid;
4087         struct nfs4_stid *s;
4088         struct nfs4_delegation *dp;
4089         struct nfs4_client *cl = cstate->session->se_client;
4090         __be32 ret = nfserr_bad_stateid;
4091
4092         nfs4_lock_state();
4093         s = find_stateid(cl, stateid);
4094         if (!s)
4095                 goto out;
4096         switch (s->sc_type) {
4097         case NFS4_DELEG_STID:
4098                 ret = nfserr_locks_held;
4099                 goto out;
4100         case NFS4_OPEN_STID:
4101         case NFS4_LOCK_STID:
4102                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
4103                 if (ret)
4104                         goto out;
4105                 if (s->sc_type == NFS4_LOCK_STID)
4106                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
4107                 else
4108                         ret = nfserr_locks_held;
4109                 break;
4110         case NFS4_REVOKED_DELEG_STID:
4111                 dp = delegstateid(s);
4112                 destroy_revoked_delegation(dp);
4113                 ret = nfs_ok;
4114                 break;
4115         default:
4116                 ret = nfserr_bad_stateid;
4117         }
4118 out:
4119         nfs4_unlock_state();
4120         return ret;
4121 }
4122
4123 static inline int
4124 setlkflg (int type)
4125 {
4126         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
4127                 RD_STATE : WR_STATE;
4128 }
4129
4130 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
4131 {
4132         struct svc_fh *current_fh = &cstate->current_fh;
4133         struct nfs4_stateowner *sop = stp->st_stateowner;
4134         __be32 status;
4135
4136         status = nfsd4_check_seqid(cstate, sop, seqid);
4137         if (status)
4138                 return status;
4139         if (stp->st_stid.sc_type == NFS4_CLOSED_STID
4140                 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4141                 /*
4142                  * "Closed" stateid's exist *only* to return
4143                  * nfserr_replay_me from the previous step, and
4144                  * revoked delegations are kept only for free_stateid.
4145                  */
4146                 return nfserr_bad_stateid;
4147         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
4148         if (status)
4149                 return status;
4150         return nfs4_check_fh(current_fh, stp);
4151 }
4152
4153 /*
4154  * Checks for sequence id mutating operations.
4155  */
4156 static __be32
4157 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
4158                          stateid_t *stateid, char typemask,
4159                          struct nfs4_ol_stateid **stpp,
4160                          struct nfsd_net *nn)
4161 {
4162         __be32 status;
4163         struct nfs4_stid *s;
4164         struct nfs4_ol_stateid *stp = NULL;
4165
4166         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
4167                 seqid, STATEID_VAL(stateid));
4168
4169         *stpp = NULL;
4170         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
4171         if (status)
4172                 return status;
4173         stp = openlockstateid(s);
4174         if (!nfsd4_has_session(cstate))
4175                 cstate->replay_owner = stp->st_stateowner;
4176
4177         status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
4178         if (!status)
4179                 *stpp = stp;
4180         return status;
4181 }
4182
4183 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
4184                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
4185 {
4186         __be32 status;
4187         struct nfs4_openowner *oo;
4188
4189         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
4190                                                 NFS4_OPEN_STID, stpp, nn);
4191         if (status)
4192                 return status;
4193         oo = openowner((*stpp)->st_stateowner);
4194         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
4195                 return nfserr_bad_stateid;
4196         return nfs_ok;
4197 }
4198
4199 __be32
4200 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4201                    struct nfsd4_open_confirm *oc)
4202 {
4203         __be32 status;
4204         struct nfs4_openowner *oo;
4205         struct nfs4_ol_stateid *stp;
4206         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4207
4208         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
4209                         cstate->current_fh.fh_dentry);
4210
4211         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
4212         if (status)
4213                 return status;
4214
4215         nfs4_lock_state();
4216
4217         status = nfs4_preprocess_seqid_op(cstate,
4218                                         oc->oc_seqid, &oc->oc_req_stateid,
4219                                         NFS4_OPEN_STID, &stp, nn);
4220         if (status)
4221                 goto out;
4222         oo = openowner(stp->st_stateowner);
4223         status = nfserr_bad_stateid;
4224         if (oo->oo_flags & NFS4_OO_CONFIRMED)
4225                 goto out;
4226         oo->oo_flags |= NFS4_OO_CONFIRMED;
4227         update_stateid(&stp->st_stid.sc_stateid);
4228         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4229         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
4230                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
4231
4232         nfsd4_client_record_create(oo->oo_owner.so_client);
4233         status = nfs_ok;
4234 out:
4235         nfsd4_bump_seqid(cstate, status);
4236         if (!cstate->replay_owner)
4237                 nfs4_unlock_state();
4238         return status;
4239 }
4240
4241 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
4242 {
4243         if (!test_access(access, stp))
4244                 return;
4245         nfs4_file_put_access(stp->st_file, access);
4246         clear_access(access, stp);
4247 }
4248
4249 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
4250 {
4251         switch (to_access) {
4252         case NFS4_SHARE_ACCESS_READ:
4253                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
4254                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
4255                 break;
4256         case NFS4_SHARE_ACCESS_WRITE:
4257                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
4258                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
4259                 break;
4260         case NFS4_SHARE_ACCESS_BOTH:
4261                 break;
4262         default:
4263                 WARN_ON_ONCE(1);
4264         }
4265 }
4266
4267 static void
4268 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
4269 {
4270         int i;
4271         for (i = 0; i < 4; i++) {
4272                 if ((i & deny) != i)
4273                         clear_deny(i, stp);
4274         }
4275 }
4276
4277 __be32
4278 nfsd4_open_downgrade(struct svc_rqst *rqstp,
4279                      struct nfsd4_compound_state *cstate,
4280                      struct nfsd4_open_downgrade *od)
4281 {
4282         __be32 status;
4283         struct nfs4_ol_stateid *stp;
4284         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4285
4286         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
4287                         cstate->current_fh.fh_dentry);
4288
4289         /* We don't yet support WANT bits: */
4290         if (od->od_deleg_want)
4291                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
4292                         od->od_deleg_want);
4293
4294         nfs4_lock_state();
4295         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
4296                                         &od->od_stateid, &stp, nn);
4297         if (status)
4298                 goto out;
4299         status = nfserr_inval;
4300         if (!test_access(od->od_share_access, stp)) {
4301                 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
4302                         stp->st_access_bmap, od->od_share_access);
4303                 goto out;
4304         }
4305         if (!test_deny(od->od_share_deny, stp)) {
4306                 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
4307                         stp->st_deny_bmap, od->od_share_deny);
4308                 goto out;
4309         }
4310         nfs4_stateid_downgrade(stp, od->od_share_access);
4311
4312         reset_union_bmap_deny(od->od_share_deny, stp);
4313
4314         update_stateid(&stp->st_stid.sc_stateid);
4315         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4316         status = nfs_ok;
4317 out:
4318         nfsd4_bump_seqid(cstate, status);
4319         if (!cstate->replay_owner)
4320                 nfs4_unlock_state();
4321         return status;
4322 }
4323
4324 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
4325 {
4326         struct nfs4_client *clp = s->st_stid.sc_client;
4327         struct nfs4_openowner *oo = openowner(s->st_stateowner);
4328
4329         s->st_stid.sc_type = NFS4_CLOSED_STID;
4330         unhash_open_stateid(s);
4331
4332         if (clp->cl_minorversion) {
4333                 free_generic_stateid(s);
4334                 if (list_empty(&oo->oo_owner.so_stateids))
4335                         release_openowner(oo);
4336         } else {
4337                 oo->oo_last_closed_stid = s;
4338                 /*
4339                  * In the 4.0 case we need to keep the owners around a
4340                  * little while to handle CLOSE replay.
4341                  */
4342                 if (list_empty(&oo->oo_owner.so_stateids))
4343                         move_to_close_lru(oo, clp->net);
4344         }
4345 }
4346
4347 /*
4348  * nfs4_unlock_state() called after encode
4349  */
4350 __be32
4351 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4352             struct nfsd4_close *close)
4353 {
4354         __be32 status;
4355         struct nfs4_ol_stateid *stp;
4356         struct net *net = SVC_NET(rqstp);
4357         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4358
4359         dprintk("NFSD: nfsd4_close on file %pd\n",
4360                         cstate->current_fh.fh_dentry);
4361
4362         nfs4_lock_state();
4363         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4364                                         &close->cl_stateid,
4365                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
4366                                         &stp, nn);
4367         nfsd4_bump_seqid(cstate, status);
4368         if (status)
4369                 goto out;
4370         update_stateid(&stp->st_stid.sc_stateid);
4371         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4372
4373         nfsd4_close_open_stateid(stp);
4374 out:
4375         if (!cstate->replay_owner)
4376                 nfs4_unlock_state();
4377         return status;
4378 }
4379
4380 __be32
4381 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4382                   struct nfsd4_delegreturn *dr)
4383 {
4384         struct nfs4_delegation *dp;
4385         stateid_t *stateid = &dr->dr_stateid;
4386         struct nfs4_stid *s;
4387         __be32 status;
4388         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4389
4390         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4391                 return status;
4392
4393         nfs4_lock_state();
4394         status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
4395         if (status)
4396                 goto out;
4397         dp = delegstateid(s);
4398         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4399         if (status)
4400                 goto out;
4401
4402         destroy_delegation(dp);
4403 out:
4404         nfs4_unlock_state();
4405
4406         return status;
4407 }
4408
4409
4410 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
4411
4412 static inline u64
4413 end_offset(u64 start, u64 len)
4414 {
4415         u64 end;
4416
4417         end = start + len;
4418         return end >= start ? end: NFS4_MAX_UINT64;
4419 }
4420
4421 /* last octet in a range */
4422 static inline u64
4423 last_byte_offset(u64 start, u64 len)
4424 {
4425         u64 end;
4426
4427         WARN_ON_ONCE(!len);
4428         end = start + len;
4429         return end > start ? end - 1: NFS4_MAX_UINT64;
4430 }
4431
4432 /*
4433  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4434  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4435  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
4436  * locking, this prevents us from being completely protocol-compliant.  The
4437  * real solution to this problem is to start using unsigned file offsets in
4438  * the VFS, but this is a very deep change!
4439  */
4440 static inline void
4441 nfs4_transform_lock_offset(struct file_lock *lock)
4442 {
4443         if (lock->fl_start < 0)
4444                 lock->fl_start = OFFSET_MAX;
4445         if (lock->fl_end < 0)
4446                 lock->fl_end = OFFSET_MAX;
4447 }
4448
4449 /* Hack!: For now, we're defining this just so we can use a pointer to it
4450  * as a unique cookie to identify our (NFSv4's) posix locks. */
4451 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
4452 };
4453
4454 static inline void
4455 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4456 {
4457         struct nfs4_lockowner *lo;
4458
4459         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4460                 lo = (struct nfs4_lockowner *) fl->fl_owner;
4461                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4462                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
4463                 if (!deny->ld_owner.data)
4464                         /* We just don't care that much */
4465                         goto nevermind;
4466                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4467                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4468         } else {
4469 nevermind:
4470                 deny->ld_owner.len = 0;
4471                 deny->ld_owner.data = NULL;
4472                 deny->ld_clientid.cl_boot = 0;
4473                 deny->ld_clientid.cl_id = 0;
4474         }
4475         deny->ld_start = fl->fl_start;
4476         deny->ld_length = NFS4_MAX_UINT64;
4477         if (fl->fl_end != NFS4_MAX_UINT64)
4478                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
4479         deny->ld_type = NFS4_READ_LT;
4480         if (fl->fl_type != F_RDLCK)
4481                 deny->ld_type = NFS4_WRITE_LT;
4482 }
4483
4484 static struct nfs4_lockowner *
4485 find_lockowner_str(clientid_t *clid, struct xdr_netobj *owner,
4486                 struct nfsd_net *nn)
4487 {
4488         unsigned int strhashval = ownerstr_hashval(clid->cl_id, owner);
4489         struct nfs4_stateowner *so;
4490
4491         list_for_each_entry(so, &nn->ownerstr_hashtbl[strhashval], so_strhash) {
4492                 if (so->so_is_open_owner)
4493                         continue;
4494                 if (!same_owner_str(so, owner, clid))
4495                         continue;
4496                 return lockowner(so);
4497         }
4498         return NULL;
4499 }
4500
4501 /*
4502  * Alloc a lock owner structure.
4503  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
4504  * occurred.
4505  *
4506  * strhashval = ownerstr_hashval
4507  */
4508 static struct nfs4_lockowner *
4509 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4510         struct nfs4_lockowner *lo;
4511         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4512
4513         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4514         if (!lo)
4515                 return NULL;
4516         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4517         lo->lo_owner.so_is_open_owner = 0;
4518         /* It is the openowner seqid that will be incremented in encode in the
4519          * case of new lockowners; so increment the lock seqid manually: */
4520         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4521         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4522         return lo;
4523 }
4524
4525 static struct nfs4_ol_stateid *
4526 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4527 {
4528         struct nfs4_ol_stateid *stp;
4529         struct nfs4_client *clp = lo->lo_owner.so_client;
4530
4531         stp = nfs4_alloc_stateid(clp);
4532         if (stp == NULL)
4533                 return NULL;
4534         stp->st_stid.sc_type = NFS4_LOCK_STID;
4535         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4536         stp->st_stateowner = &lo->lo_owner;
4537         get_nfs4_file(fp);
4538         stp->st_file = fp;
4539         stp->st_access_bmap = 0;
4540         stp->st_deny_bmap = open_stp->st_deny_bmap;
4541         stp->st_openstp = open_stp;
4542         list_add(&stp->st_locks, &open_stp->st_locks);
4543         spin_lock(&fp->fi_lock);
4544         list_add(&stp->st_perfile, &fp->fi_stateids);
4545         spin_unlock(&fp->fi_lock);
4546         return stp;
4547 }
4548
4549 static struct nfs4_ol_stateid *
4550 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
4551 {
4552         struct nfs4_ol_stateid *lst;
4553
4554         list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
4555                 if (lst->st_file == fp)
4556                         return lst;
4557         }
4558         return NULL;
4559 }
4560
4561
4562 static int
4563 check_lock_length(u64 offset, u64 length)
4564 {
4565         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4566              LOFF_OVERFLOW(offset, length)));
4567 }
4568
4569 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4570 {
4571         struct nfs4_file *fp = lock_stp->st_file;
4572
4573         if (test_access(access, lock_stp))
4574                 return;
4575         __nfs4_file_get_access(fp, access);
4576         set_access(access, lock_stp);
4577 }
4578
4579 static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
4580 {
4581         struct nfs4_file *fi = ost->st_file;
4582         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4583         struct nfs4_client *cl = oo->oo_owner.so_client;
4584         struct nfs4_lockowner *lo;
4585         unsigned int strhashval;
4586         struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4587
4588         lo = find_lockowner_str(&cl->cl_clientid, &lock->v.new.owner, nn);
4589         if (!lo) {
4590                 strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4591                                 &lock->v.new.owner);
4592                 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4593                 if (lo == NULL)
4594                         return nfserr_jukebox;
4595         } else {
4596                 /* with an existing lockowner, seqids must be the same */
4597                 if (!cstate->minorversion &&
4598                     lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
4599                         return nfserr_bad_seqid;
4600         }
4601
4602         *lst = find_lock_stateid(lo, fi);
4603         if (*lst == NULL) {
4604                 *lst = alloc_init_lock_stateid(lo, fi, ost);
4605                 if (*lst == NULL) {
4606                         release_lockowner_if_empty(lo);
4607                         return nfserr_jukebox;
4608                 }
4609                 *new = true;
4610         }
4611         return nfs_ok;
4612 }
4613
4614 /*
4615  *  LOCK operation
4616  */
4617 __be32
4618 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4619            struct nfsd4_lock *lock)
4620 {
4621         struct nfs4_openowner *open_sop = NULL;
4622         struct nfs4_lockowner *lock_sop = NULL;
4623         struct nfs4_ol_stateid *lock_stp;
4624         struct file *filp = NULL;
4625         struct file_lock *file_lock = NULL;
4626         struct file_lock *conflock = NULL;
4627         __be32 status = 0;
4628         bool new_state = false;
4629         int lkflg;
4630         int err;
4631         struct net *net = SVC_NET(rqstp);
4632         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4633
4634         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4635                 (long long) lock->lk_offset,
4636                 (long long) lock->lk_length);
4637
4638         if (check_lock_length(lock->lk_offset, lock->lk_length))
4639                  return nfserr_inval;
4640
4641         if ((status = fh_verify(rqstp, &cstate->current_fh,
4642                                 S_IFREG, NFSD_MAY_LOCK))) {
4643                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4644                 return status;
4645         }
4646
4647         nfs4_lock_state();
4648
4649         if (lock->lk_is_new) {
4650                 struct nfs4_ol_stateid *open_stp = NULL;
4651
4652                 if (nfsd4_has_session(cstate))
4653                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4654                         memcpy(&lock->v.new.clientid,
4655                                 &cstate->session->se_client->cl_clientid,
4656                                 sizeof(clientid_t));
4657
4658                 status = nfserr_stale_clientid;
4659                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4660                         goto out;
4661
4662                 /* validate and update open stateid and open seqid */
4663                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4664                                         lock->lk_new_open_seqid,
4665                                         &lock->lk_new_open_stateid,
4666                                         &open_stp, nn);
4667                 if (status)
4668                         goto out;
4669                 open_sop = openowner(open_stp->st_stateowner);
4670                 status = nfserr_bad_stateid;
4671                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4672                                                 &lock->v.new.clientid))
4673                         goto out;
4674                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4675                                                         &lock_stp, &new_state);
4676         } else
4677                 status = nfs4_preprocess_seqid_op(cstate,
4678                                        lock->lk_old_lock_seqid,
4679                                        &lock->lk_old_lock_stateid,
4680                                        NFS4_LOCK_STID, &lock_stp, nn);
4681         if (status)
4682                 goto out;
4683         lock_sop = lockowner(lock_stp->st_stateowner);
4684
4685         lkflg = setlkflg(lock->lk_type);
4686         status = nfs4_check_openmode(lock_stp, lkflg);
4687         if (status)
4688                 goto out;
4689
4690         status = nfserr_grace;
4691         if (locks_in_grace(net) && !lock->lk_reclaim)
4692                 goto out;
4693         status = nfserr_no_grace;
4694         if (!locks_in_grace(net) && lock->lk_reclaim)
4695                 goto out;
4696
4697         file_lock = locks_alloc_lock();
4698         if (!file_lock) {
4699                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4700                 status = nfserr_jukebox;
4701                 goto out;
4702         }
4703
4704         locks_init_lock(file_lock);
4705         switch (lock->lk_type) {
4706                 case NFS4_READ_LT:
4707                 case NFS4_READW_LT:
4708                         filp = find_readable_file(lock_stp->st_file);
4709                         if (filp)
4710                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4711                         file_lock->fl_type = F_RDLCK;
4712                         break;
4713                 case NFS4_WRITE_LT:
4714                 case NFS4_WRITEW_LT:
4715                         filp = find_writeable_file(lock_stp->st_file);
4716                         if (filp)
4717                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4718                         file_lock->fl_type = F_WRLCK;
4719                         break;
4720                 default:
4721                         status = nfserr_inval;
4722                 goto out;
4723         }
4724         if (!filp) {
4725                 status = nfserr_openmode;
4726                 goto out;
4727         }
4728         file_lock->fl_owner = (fl_owner_t)lock_sop;
4729         file_lock->fl_pid = current->tgid;
4730         file_lock->fl_file = filp;
4731         file_lock->fl_flags = FL_POSIX;
4732         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4733         file_lock->fl_start = lock->lk_offset;
4734         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4735         nfs4_transform_lock_offset(file_lock);
4736
4737         conflock = locks_alloc_lock();
4738         if (!conflock) {
4739                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4740                 status = nfserr_jukebox;
4741                 goto out;
4742         }
4743
4744         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4745         switch (-err) {
4746         case 0: /* success! */
4747                 update_stateid(&lock_stp->st_stid.sc_stateid);
4748                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4749                                 sizeof(stateid_t));
4750                 status = 0;
4751                 break;
4752         case (EAGAIN):          /* conflock holds conflicting lock */
4753                 status = nfserr_denied;
4754                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4755                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4756                 break;
4757         case (EDEADLK):
4758                 status = nfserr_deadlock;
4759                 break;
4760         default:
4761                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4762                 status = nfserrno(err);
4763                 break;
4764         }
4765 out:
4766         if (filp)
4767                 fput(filp);
4768         if (status && new_state)
4769                 release_lock_stateid(lock_stp);
4770         nfsd4_bump_seqid(cstate, status);
4771         if (!cstate->replay_owner)
4772                 nfs4_unlock_state();
4773         if (file_lock)
4774                 locks_free_lock(file_lock);
4775         if (conflock)
4776                 locks_free_lock(conflock);
4777         return status;
4778 }
4779
4780 /*
4781  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4782  * so we do a temporary open here just to get an open file to pass to
4783  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4784  * inode operation.)
4785  */
4786 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4787 {
4788         struct file *file;
4789         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4790         if (!err) {
4791                 err = nfserrno(vfs_test_lock(file, lock));
4792                 nfsd_close(file);
4793         }
4794         return err;
4795 }
4796
4797 /*
4798  * LOCKT operation
4799  */
4800 __be32
4801 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4802             struct nfsd4_lockt *lockt)
4803 {
4804         struct file_lock *file_lock = NULL;
4805         struct nfs4_lockowner *lo;
4806         __be32 status;
4807         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4808
4809         if (locks_in_grace(SVC_NET(rqstp)))
4810                 return nfserr_grace;
4811
4812         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4813                  return nfserr_inval;
4814
4815         nfs4_lock_state();
4816
4817         if (!nfsd4_has_session(cstate)) {
4818                 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
4819                 if (status)
4820                         goto out;
4821         }
4822
4823         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4824                 goto out;
4825
4826         file_lock = locks_alloc_lock();
4827         if (!file_lock) {
4828                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4829                 status = nfserr_jukebox;
4830                 goto out;
4831         }
4832         locks_init_lock(file_lock);
4833         switch (lockt->lt_type) {
4834                 case NFS4_READ_LT:
4835                 case NFS4_READW_LT:
4836                         file_lock->fl_type = F_RDLCK;
4837                 break;
4838                 case NFS4_WRITE_LT:
4839                 case NFS4_WRITEW_LT:
4840                         file_lock->fl_type = F_WRLCK;
4841                 break;
4842                 default:
4843                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4844                         status = nfserr_inval;
4845                 goto out;
4846         }
4847
4848         lo = find_lockowner_str(&lockt->lt_clientid, &lockt->lt_owner, nn);
4849         if (lo)
4850                 file_lock->fl_owner = (fl_owner_t)lo;
4851         file_lock->fl_pid = current->tgid;
4852         file_lock->fl_flags = FL_POSIX;
4853
4854         file_lock->fl_start = lockt->lt_offset;
4855         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4856
4857         nfs4_transform_lock_offset(file_lock);
4858
4859         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4860         if (status)
4861                 goto out;
4862
4863         if (file_lock->fl_type != F_UNLCK) {
4864                 status = nfserr_denied;
4865                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4866         }
4867 out:
4868         nfs4_unlock_state();
4869         if (file_lock)
4870                 locks_free_lock(file_lock);
4871         return status;
4872 }
4873
4874 __be32
4875 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4876             struct nfsd4_locku *locku)
4877 {
4878         struct nfs4_ol_stateid *stp;
4879         struct file *filp = NULL;
4880         struct file_lock *file_lock = NULL;
4881         __be32 status;
4882         int err;
4883         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4884
4885         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4886                 (long long) locku->lu_offset,
4887                 (long long) locku->lu_length);
4888
4889         if (check_lock_length(locku->lu_offset, locku->lu_length))
4890                  return nfserr_inval;
4891
4892         nfs4_lock_state();
4893
4894         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4895                                         &locku->lu_stateid, NFS4_LOCK_STID,
4896                                         &stp, nn);
4897         if (status)
4898                 goto out;
4899         filp = find_any_file(stp->st_file);
4900         if (!filp) {
4901                 status = nfserr_lock_range;
4902                 goto out;
4903         }
4904         file_lock = locks_alloc_lock();
4905         if (!file_lock) {
4906                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4907                 status = nfserr_jukebox;
4908                 goto fput;
4909         }
4910         locks_init_lock(file_lock);
4911         file_lock->fl_type = F_UNLCK;
4912         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4913         file_lock->fl_pid = current->tgid;
4914         file_lock->fl_file = filp;
4915         file_lock->fl_flags = FL_POSIX;
4916         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4917         file_lock->fl_start = locku->lu_offset;
4918
4919         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4920                                                 locku->lu_length);
4921         nfs4_transform_lock_offset(file_lock);
4922
4923         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4924         if (err) {
4925                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4926                 goto out_nfserr;
4927         }
4928         update_stateid(&stp->st_stid.sc_stateid);
4929         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4930 fput:
4931         fput(filp);
4932 out:
4933         nfsd4_bump_seqid(cstate, status);
4934         if (!cstate->replay_owner)
4935                 nfs4_unlock_state();
4936         if (file_lock)
4937                 locks_free_lock(file_lock);
4938         return status;
4939
4940 out_nfserr:
4941         status = nfserrno(err);
4942         goto fput;
4943 }
4944
4945 /*
4946  * returns
4947  *      1: locks held by lockowner
4948  *      0: no locks held by lockowner
4949  */
4950 static int
4951 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4952 {
4953         struct file_lock **flpp;
4954         struct inode *inode = filp->fi_inode;
4955         int status = 0;
4956
4957         spin_lock(&inode->i_lock);
4958         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4959                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4960                         status = 1;
4961                         goto out;
4962                 }
4963         }
4964 out:
4965         spin_unlock(&inode->i_lock);
4966         return status;
4967 }
4968
4969 __be32
4970 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4971                         struct nfsd4_compound_state *cstate,
4972                         struct nfsd4_release_lockowner *rlockowner)
4973 {
4974         clientid_t *clid = &rlockowner->rl_clientid;
4975         struct nfs4_stateowner *sop = NULL, *tmp;
4976         struct nfs4_lockowner *lo;
4977         struct nfs4_ol_stateid *stp;
4978         struct xdr_netobj *owner = &rlockowner->rl_owner;
4979         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4980         __be32 status;
4981         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4982
4983         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4984                 clid->cl_boot, clid->cl_id);
4985
4986         nfs4_lock_state();
4987
4988         status = lookup_clientid(clid, cstate, nn);
4989         if (status)
4990                 goto out;
4991
4992         status = nfserr_locks_held;
4993
4994         /* Find the matching lock stateowner */
4995         list_for_each_entry(tmp, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4996                 if (tmp->so_is_open_owner)
4997                         continue;
4998                 if (same_owner_str(tmp, owner, clid)) {
4999                         sop = tmp;
5000                         break;
5001                 }
5002         }
5003
5004         /* No matching owner found, maybe a replay? Just declare victory... */
5005         if (!sop) {
5006                 status = nfs_ok;
5007                 goto out;
5008         }
5009
5010         lo = lockowner(sop);
5011         /* see if there are still any locks associated with it */
5012         list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
5013                 if (check_for_locks(stp->st_file, lo))
5014                         goto out;
5015         }
5016
5017         status = nfs_ok;
5018         release_lockowner(lo);
5019 out:
5020         nfs4_unlock_state();
5021         return status;
5022 }
5023
5024 static inline struct nfs4_client_reclaim *
5025 alloc_reclaim(void)
5026 {
5027         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
5028 }
5029
5030 bool
5031 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
5032 {
5033         struct nfs4_client_reclaim *crp;
5034
5035         crp = nfsd4_find_reclaim_client(name, nn);
5036         return (crp && crp->cr_clp);
5037 }
5038
5039 /*
5040  * failure => all reset bets are off, nfserr_no_grace...
5041  */
5042 struct nfs4_client_reclaim *
5043 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
5044 {
5045         unsigned int strhashval;
5046         struct nfs4_client_reclaim *crp;
5047
5048         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
5049         crp = alloc_reclaim();
5050         if (crp) {
5051                 strhashval = clientstr_hashval(name);
5052                 INIT_LIST_HEAD(&crp->cr_strhash);
5053                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
5054                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
5055                 crp->cr_clp = NULL;
5056                 nn->reclaim_str_hashtbl_size++;
5057         }
5058         return crp;
5059 }
5060
5061 void
5062 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
5063 {
5064         list_del(&crp->cr_strhash);
5065         kfree(crp);
5066         nn->reclaim_str_hashtbl_size--;
5067 }
5068
5069 void
5070 nfs4_release_reclaim(struct nfsd_net *nn)
5071 {
5072         struct nfs4_client_reclaim *crp = NULL;
5073         int i;
5074
5075         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5076                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
5077                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
5078                                         struct nfs4_client_reclaim, cr_strhash);
5079                         nfs4_remove_reclaim_record(crp, nn);
5080                 }
5081         }
5082         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
5083 }
5084
5085 /*
5086  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
5087 struct nfs4_client_reclaim *
5088 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
5089 {
5090         unsigned int strhashval;
5091         struct nfs4_client_reclaim *crp = NULL;
5092
5093         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
5094
5095         strhashval = clientstr_hashval(recdir);
5096         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
5097                 if (same_name(crp->cr_recdir, recdir)) {
5098                         return crp;
5099                 }
5100         }
5101         return NULL;
5102 }
5103
5104 /*
5105 * Called from OPEN. Look for clientid in reclaim list.
5106 */
5107 __be32
5108 nfs4_check_open_reclaim(clientid_t *clid,
5109                 struct nfsd4_compound_state *cstate,
5110                 struct nfsd_net *nn)
5111 {
5112         __be32 status;
5113
5114         /* find clientid in conf_id_hashtbl */
5115         status = lookup_clientid(clid, cstate, nn);
5116         if (status)
5117                 return nfserr_reclaim_bad;
5118
5119         if (nfsd4_client_record_check(cstate->clp))
5120                 return nfserr_reclaim_bad;
5121
5122         return nfs_ok;
5123 }
5124
5125 #ifdef CONFIG_NFSD_FAULT_INJECTION
5126
5127 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
5128 {
5129         if (mark_client_expired(clp))
5130                 return 0;
5131         expire_client(clp);
5132         return 1;
5133 }
5134
5135 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
5136 {
5137         char buf[INET6_ADDRSTRLEN];
5138         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
5139         printk(KERN_INFO "NFS Client: %s\n", buf);
5140         return 1;
5141 }
5142
5143 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
5144                              const char *type)
5145 {
5146         char buf[INET6_ADDRSTRLEN];
5147         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
5148         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
5149 }
5150
5151 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
5152                                     void (*func)(struct nfs4_ol_stateid *))
5153 {
5154         struct nfs4_openowner *oop;
5155         struct nfs4_ol_stateid *stp, *st_next;
5156         struct nfs4_ol_stateid *lst, *lst_next;
5157         u64 count = 0;
5158
5159         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
5160                 list_for_each_entry_safe(stp, st_next,
5161                                 &oop->oo_owner.so_stateids, st_perstateowner) {
5162                         list_for_each_entry_safe(lst, lst_next,
5163                                         &stp->st_locks, st_locks) {
5164                                 if (func)
5165                                         func(lst);
5166                                 if (++count == max)
5167                                         return count;
5168                         }
5169                 }
5170         }
5171
5172         return count;
5173 }
5174
5175 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
5176 {
5177         return nfsd_foreach_client_lock(clp, max, release_lock_stateid);
5178 }
5179
5180 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
5181 {
5182         u64 count = nfsd_foreach_client_lock(clp, max, NULL);
5183         nfsd_print_count(clp, count, "locked files");
5184         return count;
5185 }
5186
5187 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
5188 {
5189         struct nfs4_openowner *oop, *next;
5190         u64 count = 0;
5191
5192         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
5193                 if (func)
5194                         func(oop);
5195                 if (++count == max)
5196                         break;
5197         }
5198
5199         return count;
5200 }
5201
5202 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
5203 {
5204         return nfsd_foreach_client_open(clp, max, release_openowner);
5205 }
5206
5207 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
5208 {
5209         u64 count = nfsd_foreach_client_open(clp, max, NULL);
5210         nfsd_print_count(clp, count, "open files");
5211         return count;
5212 }
5213
5214 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
5215                                      struct list_head *victims)
5216 {
5217         struct nfs4_delegation *dp, *next;
5218         u64 count = 0;
5219
5220         lockdep_assert_held(&state_lock);
5221         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
5222                 if (victims) {
5223                         /*
5224                          * It's not safe to mess with delegations that have a
5225                          * non-zero dl_time. They might have already been broken
5226                          * and could be processed by the laundromat outside of
5227                          * the state_lock. Just leave them be.
5228                          */
5229                         if (dp->dl_time != 0)
5230                                 continue;
5231
5232                         /*
5233                          * Increment dl_time to ensure that delegation breaks
5234                          * don't monkey with it now that we are.
5235                          */
5236                         ++dp->dl_time;
5237                         list_move(&dp->dl_recall_lru, victims);
5238                 }
5239                 if (++count == max)
5240                         break;
5241         }
5242         return count;
5243 }
5244
5245 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
5246 {
5247         struct nfs4_delegation *dp, *next;
5248         LIST_HEAD(victims);
5249         u64 count;
5250
5251         spin_lock(&state_lock);
5252         count = nfsd_find_all_delegations(clp, max, &victims);
5253         spin_unlock(&state_lock);
5254
5255         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
5256                 revoke_delegation(dp);
5257
5258         return count;
5259 }
5260
5261 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
5262 {
5263         struct nfs4_delegation *dp;
5264         LIST_HEAD(victims);
5265         u64 count;
5266
5267         spin_lock(&state_lock);
5268         count = nfsd_find_all_delegations(clp, max, &victims);
5269         while (!list_empty(&victims)) {
5270                 dp = list_first_entry(&victims, struct nfs4_delegation,
5271                                         dl_recall_lru);
5272                 list_del_init(&dp->dl_recall_lru);
5273                 dp->dl_time = 0;
5274                 nfsd_break_one_deleg(dp);
5275         }
5276         spin_unlock(&state_lock);
5277
5278         return count;
5279 }
5280
5281 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
5282 {
5283         u64 count = 0;
5284
5285         spin_lock(&state_lock);
5286         count = nfsd_find_all_delegations(clp, max, NULL);
5287         spin_unlock(&state_lock);
5288
5289         nfsd_print_count(clp, count, "delegations");
5290         return count;
5291 }
5292
5293 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
5294 {
5295         struct nfs4_client *clp, *next;
5296         u64 count = 0;
5297         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
5298
5299         if (!nfsd_netns_ready(nn))
5300                 return 0;
5301
5302         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
5303                 count += func(clp, max - count);
5304                 if ((max != 0) && (count >= max))
5305                         break;
5306         }
5307
5308         return count;
5309 }
5310
5311 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
5312 {
5313         struct nfs4_client *clp;
5314         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
5315
5316         if (!nfsd_netns_ready(nn))
5317                 return NULL;
5318
5319         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
5320                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
5321                         return clp;
5322         }
5323         return NULL;
5324 }
5325
5326 #endif /* CONFIG_NFSD_FAULT_INJECTION */
5327
5328 /*
5329  * Since the lifetime of a delegation isn't limited to that of an open, a
5330  * client may quite reasonably hang on to a delegation as long as it has
5331  * the inode cached.  This becomes an obvious problem the first time a
5332  * client's inode cache approaches the size of the server's total memory.
5333  *
5334  * For now we avoid this problem by imposing a hard limit on the number
5335  * of delegations, which varies according to the server's memory size.
5336  */
5337 static void
5338 set_max_delegations(void)
5339 {
5340         /*
5341          * Allow at most 4 delegations per megabyte of RAM.  Quick
5342          * estimates suggest that in the worst case (where every delegation
5343          * is for a different inode), a delegation could take about 1.5K,
5344          * giving a worst case usage of about 6% of memory.
5345          */
5346         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
5347 }
5348
5349 static int nfs4_state_create_net(struct net *net)
5350 {
5351         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5352         int i;
5353
5354         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5355                         CLIENT_HASH_SIZE, GFP_KERNEL);
5356         if (!nn->conf_id_hashtbl)
5357                 goto err;
5358         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5359                         CLIENT_HASH_SIZE, GFP_KERNEL);
5360         if (!nn->unconf_id_hashtbl)
5361                 goto err_unconf_id;
5362         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5363                         OWNER_HASH_SIZE, GFP_KERNEL);
5364         if (!nn->ownerstr_hashtbl)
5365                 goto err_ownerstr;
5366         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5367                         SESSION_HASH_SIZE, GFP_KERNEL);
5368         if (!nn->sessionid_hashtbl)
5369                 goto err_sessionid;
5370
5371         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5372                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5373                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5374         }
5375         for (i = 0; i < OWNER_HASH_SIZE; i++)
5376                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5377         for (i = 0; i < SESSION_HASH_SIZE; i++)
5378                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5379         nn->conf_name_tree = RB_ROOT;
5380         nn->unconf_name_tree = RB_ROOT;
5381         INIT_LIST_HEAD(&nn->client_lru);
5382         INIT_LIST_HEAD(&nn->close_lru);
5383         INIT_LIST_HEAD(&nn->del_recall_lru);
5384         spin_lock_init(&nn->client_lock);
5385
5386         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
5387         get_net(net);
5388
5389         return 0;
5390
5391 err_sessionid:
5392         kfree(nn->ownerstr_hashtbl);
5393 err_ownerstr:
5394         kfree(nn->unconf_id_hashtbl);
5395 err_unconf_id:
5396         kfree(nn->conf_id_hashtbl);
5397 err:
5398         return -ENOMEM;
5399 }
5400
5401 static void
5402 nfs4_state_destroy_net(struct net *net)
5403 {
5404         int i;
5405         struct nfs4_client *clp = NULL;
5406         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5407
5408         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5409                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
5410                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5411                         destroy_client(clp);
5412                 }
5413         }
5414
5415         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5416                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5417                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5418                         destroy_client(clp);
5419                 }
5420         }
5421
5422         kfree(nn->sessionid_hashtbl);
5423         kfree(nn->ownerstr_hashtbl);
5424         kfree(nn->unconf_id_hashtbl);
5425         kfree(nn->conf_id_hashtbl);
5426         put_net(net);
5427 }
5428
5429 int
5430 nfs4_state_start_net(struct net *net)
5431 {
5432         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5433         int ret;
5434
5435         ret = nfs4_state_create_net(net);
5436         if (ret)
5437                 return ret;
5438         nfsd4_client_tracking_init(net);
5439         nn->boot_time = get_seconds();
5440         locks_start_grace(net, &nn->nfsd4_manager);
5441         nn->grace_ended = false;
5442         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5443                nn->nfsd4_grace, net);
5444         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5445         return 0;
5446 }
5447
5448 /* initialization to perform when the nfsd service is started: */
5449
5450 int
5451 nfs4_state_start(void)
5452 {
5453         int ret;
5454
5455         ret = set_callback_cred();
5456         if (ret)
5457                 return -ENOMEM;
5458         laundry_wq = create_singlethread_workqueue("nfsd4");
5459         if (laundry_wq == NULL) {
5460                 ret = -ENOMEM;
5461                 goto out_recovery;
5462         }
5463         ret = nfsd4_create_callback_queue();
5464         if (ret)
5465                 goto out_free_laundry;
5466
5467         set_max_delegations();
5468
5469         return 0;
5470
5471 out_free_laundry:
5472         destroy_workqueue(laundry_wq);
5473 out_recovery:
5474         return ret;
5475 }
5476
5477 void
5478 nfs4_state_shutdown_net(struct net *net)
5479 {
5480         struct nfs4_delegation *dp = NULL;
5481         struct list_head *pos, *next, reaplist;
5482         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5483
5484         cancel_delayed_work_sync(&nn->laundromat_work);
5485         locks_end_grace(&nn->nfsd4_manager);
5486
5487         nfs4_lock_state();
5488         INIT_LIST_HEAD(&reaplist);
5489         spin_lock(&state_lock);
5490         list_for_each_safe(pos, next, &nn->del_recall_lru) {
5491                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5492                 list_move(&dp->dl_recall_lru, &reaplist);
5493         }
5494         spin_unlock(&state_lock);
5495         list_for_each_safe(pos, next, &reaplist) {
5496                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5497                 destroy_delegation(dp);
5498         }
5499
5500         nfsd4_client_tracking_exit(net);
5501         nfs4_state_destroy_net(net);
5502         nfs4_unlock_state();
5503 }
5504
5505 void
5506 nfs4_state_shutdown(void)
5507 {
5508         destroy_workqueue(laundry_wq);
5509         nfsd4_destroy_callback_queue();
5510 }
5511
5512 static void
5513 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5514 {
5515         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5516                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5517 }
5518
5519 static void
5520 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5521 {
5522         if (cstate->minorversion) {
5523                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5524                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5525         }
5526 }
5527
5528 void
5529 clear_current_stateid(struct nfsd4_compound_state *cstate)
5530 {
5531         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5532 }
5533
5534 /*
5535  * functions to set current state id
5536  */
5537 void
5538 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5539 {
5540         put_stateid(cstate, &odp->od_stateid);
5541 }
5542
5543 void
5544 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5545 {
5546         put_stateid(cstate, &open->op_stateid);
5547 }
5548
5549 void
5550 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5551 {
5552         put_stateid(cstate, &close->cl_stateid);
5553 }
5554
5555 void
5556 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5557 {
5558         put_stateid(cstate, &lock->lk_resp_stateid);
5559 }
5560
5561 /*
5562  * functions to consume current state id
5563  */
5564
5565 void
5566 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5567 {
5568         get_stateid(cstate, &odp->od_stateid);
5569 }
5570
5571 void
5572 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5573 {
5574         get_stateid(cstate, &drp->dr_stateid);
5575 }
5576
5577 void
5578 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5579 {
5580         get_stateid(cstate, &fsp->fr_stateid);
5581 }
5582
5583 void
5584 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5585 {
5586         get_stateid(cstate, &setattr->sa_stateid);
5587 }
5588
5589 void
5590 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5591 {
5592         get_stateid(cstate, &close->cl_stateid);
5593 }
5594
5595 void
5596 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5597 {
5598         get_stateid(cstate, &locku->lu_stateid);
5599 }
5600
5601 void
5602 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5603 {
5604         get_stateid(cstate, &read->rd_stateid);
5605 }
5606
5607 void
5608 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5609 {
5610         get_stateid(cstate, &write->wr_stateid);
5611 }