kernel/fs/nfsd/nfs4state.c

   1 /*
   2 *  Copyright (c) 2001 The Regents of the University of Michigan.
   3 *  All rights reserved.
   4 *
   5 *  Kendrick Smith <kmsmith@umich.edu>
   6 *  Andy Adamson <kandros@umich.edu>
   7 *
   8 *  Redistribution and use in source and binary forms, with or without
   9 *  modification, are permitted provided that the following conditions
  10 *  are met:
  11 *
  12 *  1. Redistributions of source code must retain the above copyright
  13 *     notice, this list of conditions and the following disclaimer.
  14 *  2. Redistributions in binary form must reproduce the above copyright
  15 *     notice, this list of conditions and the following disclaimer in the
  16 *     documentation and/or other materials provided with the distribution.
  17 *  3. Neither the name of the University nor the names of its
  18 *     contributors may be used to endorse or promote products derived
  19 *     from this software without specific prior written permission.
  20 *
  21 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32 *
  33 */
  34
  35 #include <linux/file.h>
  36 #include <linux/fs.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/swap.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/ratelimit.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43 #include <linux/sunrpc/addr.h>
  44 #include <linux/jhash.h>
  45 #include "xdr4.h"
  46 #include "xdr4cb.h"
  47 #include "vfs.h"
  48 #include "current_stateid.h"
  49
  50 #include "netns.h"
  51 #include "pnfs.h"
  52
  53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  54
  55 #define all_ones {{~0,~0},~0}
  56 static const stateid_t one_stateid = {
  57         .si_generation = ~0,
  58         .si_opaque = all_ones,
  59 };
  60 static const stateid_t zero_stateid = {
  61         /* all fields zero */
  62 };
  63 static const stateid_t currentstateid = {
  64         .si_generation = 1,
  65 };
  66
  67 static u64 current_sessionid = 1;
  68
  69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  70 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  71 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  72
  73 /* forward declarations */
  74 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
  75 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
  76
  77 /* Locking: */
  78
  79 /*
  80  * Currently used for the del_recall_lru and file hash table.  In an
  81  * effort to decrease the scope of the client_mutex, this spinlock may
  82  * eventually cover more:
  83  */
  84 static DEFINE_SPINLOCK(state_lock);
  85
  86 /*
  87  * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
  88  * the refcount on the open stateid to drop.
  89  */
  90 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
  91
  92 static struct kmem_cache *openowner_slab;
  93 static struct kmem_cache *lockowner_slab;
  94 static struct kmem_cache *file_slab;
  95 static struct kmem_cache *stateid_slab;
  96 static struct kmem_cache *deleg_slab;
  97 static struct kmem_cache *odstate_slab;
  98
  99 static void free_session(struct nfsd4_session *);
 100
 101 static struct nfsd4_callback_ops nfsd4_cb_recall_ops;
 102
 103 static bool is_session_dead(struct nfsd4_session *ses)
 104 {
 105         return ses->se_flags & NFS4_SESSION_DEAD;
 106 }
 107
 108 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 109 {
 110         if (atomic_read(&ses->se_ref) > ref_held_by_me)
 111                 return nfserr_jukebox;
 112         ses->se_flags |= NFS4_SESSION_DEAD;
 113         return nfs_ok;
 114 }
 115
 116 static bool is_client_expired(struct nfs4_client *clp)
 117 {
 118         return clp->cl_time == 0;
 119 }
 120
 121 static __be32 get_client_locked(struct nfs4_client *clp)
 122 {
 123         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 124
 125         lockdep_assert_held(&nn->client_lock);
 126
 127         if (is_client_expired(clp))
 128                 return nfserr_expired;
 129         atomic_inc(&clp->cl_refcount);
 130         return nfs_ok;
 131 }
 132
 133 /* must be called under the client_lock */
 134 static inline void
 135 renew_client_locked(struct nfs4_client *clp)
 136 {
 137         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 138
 139         if (is_client_expired(clp)) {
 140                 WARN_ON(1);
 141                 printk("%s: client (clientid %08x/%08x) already expired\n",
 142                         __func__,
 143                         clp->cl_clientid.cl_boot,
 144                         clp->cl_clientid.cl_id);
 145                 return;
 146         }
 147
 148         dprintk("renewing client (clientid %08x/%08x)\n",
 149                         clp->cl_clientid.cl_boot,
 150                         clp->cl_clientid.cl_id);
 151         list_move_tail(&clp->cl_lru, &nn->client_lru);
 152         clp->cl_time = get_seconds();
 153 }
 154
 155 static void put_client_renew_locked(struct nfs4_client *clp)
 156 {
 157         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 158
 159         lockdep_assert_held(&nn->client_lock);
 160
 161         if (!atomic_dec_and_test(&clp->cl_refcount))
 162                 return;
 163         if (!is_client_expired(clp))
 164                 renew_client_locked(clp);
 165 }
 166
 167 static void put_client_renew(struct nfs4_client *clp)
 168 {
 169         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 170
 171         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
 172                 return;
 173         if (!is_client_expired(clp))
 174                 renew_client_locked(clp);
 175         spin_unlock(&nn->client_lock);
 176 }
 177
 178 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 179 {
 180         __be32 status;
 181
 182         if (is_session_dead(ses))
 183                 return nfserr_badsession;
 184         status = get_client_locked(ses->se_client);
 185         if (status)
 186                 return status;
 187         atomic_inc(&ses->se_ref);
 188         return nfs_ok;
 189 }
 190
 191 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 192 {
 193         struct nfs4_client *clp = ses->se_client;
 194         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 195
 196         lockdep_assert_held(&nn->client_lock);
 197
 198         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 199                 free_session(ses);
 200         put_client_renew_locked(clp);
 201 }
 202
 203 static void nfsd4_put_session(struct nfsd4_session *ses)
 204 {
 205         struct nfs4_client *clp = ses->se_client;
 206         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 207
 208         spin_lock(&nn->client_lock);
 209         nfsd4_put_session_locked(ses);
 210         spin_unlock(&nn->client_lock);
 211 }
 212
 213 static inline struct nfs4_stateowner *
 214 nfs4_get_stateowner(struct nfs4_stateowner *sop)
 215 {
 216         atomic_inc(&sop->so_count);
 217         return sop;
 218 }
 219
 220 static int
 221 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
 222 {
 223         return (sop->so_owner.len == owner->len) &&
 224                 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
 225 }
 226
 227 static struct nfs4_openowner *
 228 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
 229                         struct nfs4_client *clp)
 230 {
 231         struct nfs4_stateowner *so;
 232
 233         lockdep_assert_held(&clp->cl_lock);
 234
 235         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
 236                             so_strhash) {
 237                 if (!so->so_is_open_owner)
 238                         continue;
 239                 if (same_owner_str(so, &open->op_owner))
 240                         return openowner(nfs4_get_stateowner(so));
 241         }
 242         return NULL;
 243 }
 244
 245 static struct nfs4_openowner *
 246 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
 247                         struct nfs4_client *clp)
 248 {
 249         struct nfs4_openowner *oo;
 250
 251         spin_lock(&clp->cl_lock);
 252         oo = find_openstateowner_str_locked(hashval, open, clp);
 253         spin_unlock(&clp->cl_lock);
 254         return oo;
 255 }
 256
 257 static inline u32
 258 opaque_hashval(const void *ptr, int nbytes)
 259 {
 260         unsigned char *cptr = (unsigned char *) ptr;
 261
 262         u32 x = 0;
 263         while (nbytes--) {
 264                 x *= 37;
 265                 x += *cptr++;
 266         }
 267         return x;
 268 }
 269
 270 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
 271 {
 272         struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
 273
 274         kmem_cache_free(file_slab, fp);
 275 }
 276
 277 void
 278 put_nfs4_file(struct nfs4_file *fi)
 279 {
 280         might_lock(&state_lock);
 281
 282         if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
 283                 hlist_del_rcu(&fi->fi_hash);
 284                 spin_unlock(&state_lock);
 285                 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
 286                 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
 287                 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
 288         }
 289 }
 290
 291 static struct file *
 292 __nfs4_get_fd(struct nfs4_file *f, int oflag)
 293 {
 294         if (f->fi_fds[oflag])
 295                 return get_file(f->fi_fds[oflag]);
 296         return NULL;
 297 }
 298
 299 static struct file *
 300 find_writeable_file_locked(struct nfs4_file *f)
 301 {
 302         struct file *ret;
 303
 304         lockdep_assert_held(&f->fi_lock);
 305
 306         ret = __nfs4_get_fd(f, O_WRONLY);
 307         if (!ret)
 308                 ret = __nfs4_get_fd(f, O_RDWR);
 309         return ret;
 310 }
 311
 312 static struct file *
 313 find_writeable_file(struct nfs4_file *f)
 314 {
 315         struct file *ret;
 316
 317         spin_lock(&f->fi_lock);
 318         ret = find_writeable_file_locked(f);
 319         spin_unlock(&f->fi_lock);
 320
 321         return ret;
 322 }
 323
 324 static struct file *find_readable_file_locked(struct nfs4_file *f)
 325 {
 326         struct file *ret;
 327
 328         lockdep_assert_held(&f->fi_lock);
 329
 330         ret = __nfs4_get_fd(f, O_RDONLY);
 331         if (!ret)
 332                 ret = __nfs4_get_fd(f, O_RDWR);
 333         return ret;
 334 }
 335
 336 static struct file *
 337 find_readable_file(struct nfs4_file *f)
 338 {
 339         struct file *ret;
 340
 341         spin_lock(&f->fi_lock);
 342         ret = find_readable_file_locked(f);
 343         spin_unlock(&f->fi_lock);
 344
 345         return ret;
 346 }
 347
 348 struct file *
 349 find_any_file(struct nfs4_file *f)
 350 {
 351         struct file *ret;
 352
 353         spin_lock(&f->fi_lock);
 354         ret = __nfs4_get_fd(f, O_RDWR);
 355         if (!ret) {
 356                 ret = __nfs4_get_fd(f, O_WRONLY);
 357                 if (!ret)
 358                         ret = __nfs4_get_fd(f, O_RDONLY);
 359         }
 360         spin_unlock(&f->fi_lock);
 361         return ret;
 362 }
 363
 364 static atomic_long_t num_delegations;
 365 unsigned long max_delegations;
 366
 367 /*
 368  * Open owner state (share locks)
 369  */
 370
 371 /* hash tables for lock and open owners */
 372 #define OWNER_HASH_BITS              8
 373 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 374 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 375
 376 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
 377 {
 378         unsigned int ret;
 379
 380         ret = opaque_hashval(ownername->data, ownername->len);
 381         return ret & OWNER_HASH_MASK;
 382 }
 383
 384 /* hash table for nfs4_file */
 385 #define FILE_HASH_BITS                   8
 386 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 387
 388 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
 389 {
 390         return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
 391 }
 392
 393 static unsigned int file_hashval(struct knfsd_fh *fh)
 394 {
 395         return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
 396 }
 397
 398 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 399
 400 static void
 401 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 402 {
 403         lockdep_assert_held(&fp->fi_lock);
 404
 405         if (access & NFS4_SHARE_ACCESS_WRITE)
 406                 atomic_inc(&fp->fi_access[O_WRONLY]);
 407         if (access & NFS4_SHARE_ACCESS_READ)
 408                 atomic_inc(&fp->fi_access[O_RDONLY]);
 409 }
 410
 411 static __be32
 412 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
 413 {
 414         lockdep_assert_held(&fp->fi_lock);
 415
 416         /* Does this access mode make sense? */
 417         if (access & ~NFS4_SHARE_ACCESS_BOTH)
 418                 return nfserr_inval;
 419
 420         /* Does it conflict with a deny mode already set? */
 421         if ((access & fp->fi_share_deny) != 0)
 422                 return nfserr_share_denied;
 423
 424         __nfs4_file_get_access(fp, access);
 425         return nfs_ok;
 426 }
 427
 428 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
 429 {
 430         /* Common case is that there is no deny mode. */
 431         if (deny) {
 432                 /* Does this deny mode make sense? */
 433                 if (deny & ~NFS4_SHARE_DENY_BOTH)
 434                         return nfserr_inval;
 435
 436                 if ((deny & NFS4_SHARE_DENY_READ) &&
 437                     atomic_read(&fp->fi_access[O_RDONLY]))
 438                         return nfserr_share_denied;
 439
 440                 if ((deny & NFS4_SHARE_DENY_WRITE) &&
 441                     atomic_read(&fp->fi_access[O_WRONLY]))
 442                         return nfserr_share_denied;
 443         }
 444         return nfs_ok;
 445 }
 446
 447 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 448 {
 449         might_lock(&fp->fi_lock);
 450
 451         if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
 452                 struct file *f1 = NULL;
 453                 struct file *f2 = NULL;
 454
 455                 swap(f1, fp->fi_fds[oflag]);
 456                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 457                         swap(f2, fp->fi_fds[O_RDWR]);
 458                 spin_unlock(&fp->fi_lock);
 459                 if (f1)
 460                         fput(f1);
 461                 if (f2)
 462                         fput(f2);
 463         }
 464 }
 465
 466 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
 467 {
 468         WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
 469
 470         if (access & NFS4_SHARE_ACCESS_WRITE)
 471                 __nfs4_file_put_access(fp, O_WRONLY);
 472         if (access & NFS4_SHARE_ACCESS_READ)
 473                 __nfs4_file_put_access(fp, O_RDONLY);
 474 }
 475
 476 /*
 477  * Allocate a new open/delegation state counter. This is needed for
 478  * pNFS for proper return on close semantics.
 479  *
 480  * Note that we only allocate it for pNFS-enabled exports, otherwise
 481  * all pointers to struct nfs4_clnt_odstate are always NULL.
 482  */
 483 static struct nfs4_clnt_odstate *
 484 alloc_clnt_odstate(struct nfs4_client *clp)
 485 {
 486         struct nfs4_clnt_odstate *co;
 487
 488         co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
 489         if (co) {
 490                 co->co_client = clp;
 491                 atomic_set(&co->co_odcount, 1);
 492         }
 493         return co;
 494 }
 495
 496 static void
 497 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
 498 {
 499         struct nfs4_file *fp = co->co_file;
 500
 501         lockdep_assert_held(&fp->fi_lock);
 502         list_add(&co->co_perfile, &fp->fi_clnt_odstate);
 503 }
 504
 505 static inline void
 506 get_clnt_odstate(struct nfs4_clnt_odstate *co)
 507 {
 508         if (co)
 509                 atomic_inc(&co->co_odcount);
 510 }
 511
 512 static void
 513 put_clnt_odstate(struct nfs4_clnt_odstate *co)
 514 {
 515         struct nfs4_file *fp;
 516
 517         if (!co)
 518                 return;
 519
 520         fp = co->co_file;
 521         if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
 522                 list_del(&co->co_perfile);
 523                 spin_unlock(&fp->fi_lock);
 524
 525                 nfsd4_return_all_file_layouts(co->co_client, fp);
 526                 kmem_cache_free(odstate_slab, co);
 527         }
 528 }
 529
 530 static struct nfs4_clnt_odstate *
 531 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
 532 {
 533         struct nfs4_clnt_odstate *co;
 534         struct nfs4_client *cl;
 535
 536         if (!new)
 537                 return NULL;
 538
 539         cl = new->co_client;
 540
 541         spin_lock(&fp->fi_lock);
 542         list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
 543                 if (co->co_client == cl) {
 544                         get_clnt_odstate(co);
 545                         goto out;
 546                 }
 547         }
 548         co = new;
 549         co->co_file = fp;
 550         hash_clnt_odstate_locked(new);
 551 out:
 552         spin_unlock(&fp->fi_lock);
 553         return co;
 554 }
 555
 556 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl,
 557                                          struct kmem_cache *slab)
 558 {
 559         struct nfs4_stid *stid;
 560         int new_id;
 561
 562         stid = kmem_cache_zalloc(slab, GFP_KERNEL);
 563         if (!stid)
 564                 return NULL;
 565
 566         idr_preload(GFP_KERNEL);
 567         spin_lock(&cl->cl_lock);
 568         new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
 569         spin_unlock(&cl->cl_lock);
 570         idr_preload_end();
 571         if (new_id < 0)
 572                 goto out_free;
 573         stid->sc_client = cl;
 574         stid->sc_stateid.si_opaque.so_id = new_id;
 575         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 576         /* Will be incremented before return to client: */
 577         atomic_set(&stid->sc_count, 1);
 578         spin_lock_init(&stid->sc_lock);
 579
 580         /*
 581          * It shouldn't be a problem to reuse an opaque stateid value.
 582          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 583          * example, a stray write retransmission could be accepted by
 584          * the server when it should have been rejected.  Therefore,
 585          * adopt a trick from the sctp code to attempt to maximize the
 586          * amount of time until an id is reused, by ensuring they always
 587          * "increase" (mod INT_MAX):
 588          */
 589         return stid;
 590 out_free:
 591         kmem_cache_free(slab, stid);
 592         return NULL;
 593 }
 594
 595 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
 596 {
 597         struct nfs4_stid *stid;
 598         struct nfs4_ol_stateid *stp;
 599
 600         stid = nfs4_alloc_stid(clp, stateid_slab);
 601         if (!stid)
 602                 return NULL;
 603
 604         stp = openlockstateid(stid);
 605         stp->st_stid.sc_free = nfs4_free_ol_stateid;
 606         return stp;
 607 }
 608
 609 static void nfs4_free_deleg(struct nfs4_stid *stid)
 610 {
 611         kmem_cache_free(deleg_slab, stid);
 612         atomic_long_dec(&num_delegations);
 613 }
 614
 615 /*
 616  * When we recall a delegation, we should be careful not to hand it
 617  * out again straight away.
 618  * To ensure this we keep a pair of bloom filters ('new' and 'old')
 619  * in which the filehandles of recalled delegations are "stored".
 620  * If a filehandle appear in either filter, a delegation is blocked.
 621  * When a delegation is recalled, the filehandle is stored in the "new"
 622  * filter.
 623  * Every 30 seconds we swap the filters and clear the "new" one,
 624  * unless both are empty of course.
 625  *
 626  * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
 627  * low 3 bytes as hash-table indices.
 628  *
 629  * 'blocked_delegations_lock', which is always taken in block_delegations(),
 630  * is used to manage concurrent access.  Testing does not need the lock
 631  * except when swapping the two filters.
 632  */
 633 static DEFINE_SPINLOCK(blocked_delegations_lock);
 634 static struct bloom_pair {
 635         int     entries, old_entries;
 636         time_t  swap_time;
 637         int     new; /* index into 'set' */
 638         DECLARE_BITMAP(set[2], 256);
 639 } blocked_delegations;
 640
 641 static int delegation_blocked(struct knfsd_fh *fh)
 642 {
 643         u32 hash;
 644         struct bloom_pair *bd = &blocked_delegations;
 645
 646         if (bd->entries == 0)
 647                 return 0;
 648         if (seconds_since_boot() - bd->swap_time > 30) {
 649                 spin_lock(&blocked_delegations_lock);
 650                 if (seconds_since_boot() - bd->swap_time > 30) {
 651                         bd->entries -= bd->old_entries;
 652                         bd->old_entries = bd->entries;
 653                         memset(bd->set[bd->new], 0,
 654                                sizeof(bd->set[0]));
 655                         bd->new = 1-bd->new;
 656                         bd->swap_time = seconds_since_boot();
 657                 }
 658                 spin_unlock(&blocked_delegations_lock);
 659         }
 660         hash = jhash(&fh->fh_base, fh->fh_size, 0);
 661         if (test_bit(hash&255, bd->set[0]) &&
 662             test_bit((hash>>8)&255, bd->set[0]) &&
 663             test_bit((hash>>16)&255, bd->set[0]))
 664                 return 1;
 665
 666         if (test_bit(hash&255, bd->set[1]) &&
 667             test_bit((hash>>8)&255, bd->set[1]) &&
 668             test_bit((hash>>16)&255, bd->set[1]))
 669                 return 1;
 670
 671         return 0;
 672 }
 673
 674 static void block_delegations(struct knfsd_fh *fh)
 675 {
 676         u32 hash;
 677         struct bloom_pair *bd = &blocked_delegations;
 678
 679         hash = jhash(&fh->fh_base, fh->fh_size, 0);
 680
 681         spin_lock(&blocked_delegations_lock);
 682         __set_bit(hash&255, bd->set[bd->new]);
 683         __set_bit((hash>>8)&255, bd->set[bd->new]);
 684         __set_bit((hash>>16)&255, bd->set[bd->new]);
 685         if (bd->entries == 0)
 686                 bd->swap_time = seconds_since_boot();
 687         bd->entries += 1;
 688         spin_unlock(&blocked_delegations_lock);
 689 }
 690
 691 static struct nfs4_delegation *
 692 alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh,
 693                  struct nfs4_clnt_odstate *odstate)
 694 {
 695         struct nfs4_delegation *dp;
 696         long n;
 697
 698         dprintk("NFSD alloc_init_deleg\n");
 699         n = atomic_long_inc_return(&num_delegations);
 700         if (n < 0 || n > max_delegations)
 701                 goto out_dec;
 702         if (delegation_blocked(&current_fh->fh_handle))
 703                 goto out_dec;
 704         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 705         if (dp == NULL)
 706                 goto out_dec;
 707
 708         dp->dl_stid.sc_free = nfs4_free_deleg;
 709         /*
 710          * delegation seqid's are never incremented.  The 4.1 special
 711          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 712          * 0 anyway just for consistency and use 1:
 713          */
 714         dp->dl_stid.sc_stateid.si_generation = 1;
 715         INIT_LIST_HEAD(&dp->dl_perfile);
 716         INIT_LIST_HEAD(&dp->dl_perclnt);
 717         INIT_LIST_HEAD(&dp->dl_recall_lru);
 718         dp->dl_clnt_odstate = odstate;
 719         get_clnt_odstate(odstate);
 720         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
 721         dp->dl_retries = 1;
 722         nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
 723                       &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
 724         return dp;
 725 out_dec:
 726         atomic_long_dec(&num_delegations);
 727         return NULL;
 728 }
 729
 730 void
 731 nfs4_put_stid(struct nfs4_stid *s)
 732 {
 733         struct nfs4_file *fp = s->sc_file;
 734         struct nfs4_client *clp = s->sc_client;
 735
 736         might_lock(&clp->cl_lock);
 737
 738         if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
 739                 wake_up_all(&close_wq);
 740                 return;
 741         }
 742         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
 743         spin_unlock(&clp->cl_lock);
 744         s->sc_free(s);
 745         if (fp)
 746                 put_nfs4_file(fp);
 747 }
 748
 749 void
 750 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
 751 {
 752         stateid_t *src = &stid->sc_stateid;
 753
 754         spin_lock(&stid->sc_lock);
 755         if (unlikely(++src->si_generation == 0))
 756                 src->si_generation = 1;
 757         memcpy(dst, src, sizeof(*dst));
 758         spin_unlock(&stid->sc_lock);
 759 }
 760
 761 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 762 {
 763         struct file *filp = NULL;
 764
 765         spin_lock(&fp->fi_lock);
 766         if (fp->fi_deleg_file && --fp->fi_delegees == 0)
 767                 swap(filp, fp->fi_deleg_file);
 768         spin_unlock(&fp->fi_lock);
 769
 770         if (filp) {
 771                 vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
 772                 fput(filp);
 773         }
 774 }
 775
 776 void nfs4_unhash_stid(struct nfs4_stid *s)
 777 {
 778         s->sc_type = 0;
 779 }
 780
 781 /**
 782  * nfs4_get_existing_delegation - Discover if this delegation already exists
 783  * @clp:     a pointer to the nfs4_client we're granting a delegation to
 784  * @fp:      a pointer to the nfs4_file we're granting a delegation on
 785  *
 786  * Return:
 787  *      On success: NULL if an existing delegation was not found.
 788  *
 789  *      On error: -EAGAIN if one was previously granted to this nfs4_client
 790  *                 for this nfs4_file.
 791  *
 792  */
 793
 794 static int
 795 nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
 796 {
 797         struct nfs4_delegation *searchdp = NULL;
 798         struct nfs4_client *searchclp = NULL;
 799
 800         lockdep_assert_held(&state_lock);
 801         lockdep_assert_held(&fp->fi_lock);
 802
 803         list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
 804                 searchclp = searchdp->dl_stid.sc_client;
 805                 if (clp == searchclp) {
 806                         return -EAGAIN;
 807                 }
 808         }
 809         return 0;
 810 }
 811
 812 /**
 813  * hash_delegation_locked - Add a delegation to the appropriate lists
 814  * @dp:     a pointer to the nfs4_delegation we are adding.
 815  * @fp:     a pointer to the nfs4_file we're granting a delegation on
 816  *
 817  * Return:
 818  *      On success: NULL if the delegation was successfully hashed.
 819  *
 820  *      On error: -EAGAIN if one was previously granted to this
 821  *                 nfs4_client for this nfs4_file. Delegation is not hashed.
 822  *
 823  */
 824
 825 static int
 826 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 827 {
 828         int status;
 829         struct nfs4_client *clp = dp->dl_stid.sc_client;
 830
 831         lockdep_assert_held(&state_lock);
 832         lockdep_assert_held(&fp->fi_lock);
 833
 834         status = nfs4_get_existing_delegation(clp, fp);
 835         if (status)
 836                 return status;
 837         ++fp->fi_delegees;
 838         atomic_inc(&dp->dl_stid.sc_count);
 839         dp->dl_stid.sc_type = NFS4_DELEG_STID;
 840         list_add(&dp->dl_perfile, &fp->fi_delegations);
 841         list_add(&dp->dl_perclnt, &clp->cl_delegations);
 842         return 0;
 843 }
 844
 845 static bool
 846 unhash_delegation_locked(struct nfs4_delegation *dp)
 847 {
 848         struct nfs4_file *fp = dp->dl_stid.sc_file;
 849
 850         lockdep_assert_held(&state_lock);
 851
 852         if (list_empty(&dp->dl_perfile))
 853                 return false;
 854
 855         dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
 856         /* Ensure that deleg break won't try to requeue it */
 857         ++dp->dl_time;
 858         spin_lock(&fp->fi_lock);
 859         list_del_init(&dp->dl_perclnt);
 860         list_del_init(&dp->dl_recall_lru);
 861         list_del_init(&dp->dl_perfile);
 862         spin_unlock(&fp->fi_lock);
 863         return true;
 864 }
 865
 866 static void destroy_delegation(struct nfs4_delegation *dp)
 867 {
 868         bool unhashed;
 869
 870         spin_lock(&state_lock);
 871         unhashed = unhash_delegation_locked(dp);
 872         spin_unlock(&state_lock);
 873         if (unhashed) {
 874                 put_clnt_odstate(dp->dl_clnt_odstate);
 875                 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
 876                 nfs4_put_stid(&dp->dl_stid);
 877         }
 878 }
 879
 880 static void revoke_delegation(struct nfs4_delegation *dp)
 881 {
 882         struct nfs4_client *clp = dp->dl_stid.sc_client;
 883
 884         WARN_ON(!list_empty(&dp->dl_recall_lru));
 885
 886         put_clnt_odstate(dp->dl_clnt_odstate);
 887         nfs4_put_deleg_lease(dp->dl_stid.sc_file);
 888
 889         if (clp->cl_minorversion == 0)
 890                 nfs4_put_stid(&dp->dl_stid);
 891         else {
 892                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
 893                 spin_lock(&clp->cl_lock);
 894                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
 895                 spin_unlock(&clp->cl_lock);
 896         }
 897 }
 898
 899 /*
 900  * SETCLIENTID state
 901  */
 902
 903 static unsigned int clientid_hashval(u32 id)
 904 {
 905         return id & CLIENT_HASH_MASK;
 906 }
 907
 908 static unsigned int clientstr_hashval(const char *name)
 909 {
 910         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 911 }
 912
 913 /*
 914  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 915  * st_{access,deny}_bmap field of the stateid, in order to track not
 916  * only what share bits are currently in force, but also what
 917  * combinations of share bits previous opens have used.  This allows us
 918  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 919  * return an error if the client attempt to downgrade to a combination
 920  * of share bits not explicable by closing some of its previous opens.
 921  *
 922  * XXX: This enforcement is actually incomplete, since we don't keep
 923  * track of access/deny bit combinations; so, e.g., we allow:
 924  *
 925  *      OPEN allow read, deny write
 926  *      OPEN allow both, deny none
 927  *      DOWNGRADE allow read, deny none
 928  *
 929  * which we should reject.
 930  */
 931 static unsigned int
 932 bmap_to_share_mode(unsigned long bmap) {
 933         int i;
 934         unsigned int access = 0;
 935
 936         for (i = 1; i < 4; i++) {
 937                 if (test_bit(i, &bmap))
 938                         access |= i;
 939         }
 940         return access;
 941 }
 942
 943 /* set share access for a given stateid */
 944 static inline void
 945 set_access(u32 access, struct nfs4_ol_stateid *stp)
 946 {
 947         unsigned char mask = 1 << access;
 948
 949         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 950         stp->st_access_bmap |= mask;
 951 }
 952
 953 /* clear share access for a given stateid */
 954 static inline void
 955 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 956 {
 957         unsigned char mask = 1 << access;
 958
 959         WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
 960         stp->st_access_bmap &= ~mask;
 961 }
 962
 963 /* test whether a given stateid has access */
 964 static inline bool
 965 test_access(u32 access, struct nfs4_ol_stateid *stp)
 966 {
 967         unsigned char mask = 1 << access;
 968
 969         return (bool)(stp->st_access_bmap & mask);
 970 }
 971
 972 /* set share deny for a given stateid */
 973 static inline void
 974 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
 975 {
 976         unsigned char mask = 1 << deny;
 977
 978         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 979         stp->st_deny_bmap |= mask;
 980 }
 981
 982 /* clear share deny for a given stateid */
 983 static inline void
 984 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
 985 {
 986         unsigned char mask = 1 << deny;
 987
 988         WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
 989         stp->st_deny_bmap &= ~mask;
 990 }
 991
 992 /* test whether a given stateid is denying specific access */
 993 static inline bool
 994 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
 995 {
 996         unsigned char mask = 1 << deny;
 997
 998         return (bool)(stp->st_deny_bmap & mask);
 999 }
1000
1001 static int nfs4_access_to_omode(u32 access)
1002 {
1003         switch (access & NFS4_SHARE_ACCESS_BOTH) {
1004         case NFS4_SHARE_ACCESS_READ:
1005                 return O_RDONLY;
1006         case NFS4_SHARE_ACCESS_WRITE:
1007                 return O_WRONLY;
1008         case NFS4_SHARE_ACCESS_BOTH:
1009                 return O_RDWR;
1010         }
1011         WARN_ON_ONCE(1);
1012         return O_RDONLY;
1013 }
1014
1015 /*
1016  * A stateid that had a deny mode associated with it is being released
1017  * or downgraded. Recalculate the deny mode on the file.
1018  */
1019 static void
1020 recalculate_deny_mode(struct nfs4_file *fp)
1021 {
1022         struct nfs4_ol_stateid *stp;
1023
1024         spin_lock(&fp->fi_lock);
1025         fp->fi_share_deny = 0;
1026         list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1027                 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1028         spin_unlock(&fp->fi_lock);
1029 }
1030
1031 static void
1032 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1033 {
1034         int i;
1035         bool change = false;
1036
1037         for (i = 1; i < 4; i++) {
1038                 if ((i & deny) != i) {
1039                         change = true;
1040                         clear_deny(i, stp);
1041                 }
1042         }
1043
1044         /* Recalculate per-file deny mode if there was a change */
1045         if (change)
1046                 recalculate_deny_mode(stp->st_stid.sc_file);
1047 }
1048
1049 /* release all access and file references for a given stateid */
1050 static void
1051 release_all_access(struct nfs4_ol_stateid *stp)
1052 {
1053         int i;
1054         struct nfs4_file *fp = stp->st_stid.sc_file;
1055
1056         if (fp && stp->st_deny_bmap != 0)
1057                 recalculate_deny_mode(fp);
1058
1059         for (i = 1; i < 4; i++) {
1060                 if (test_access(i, stp))
1061                         nfs4_file_put_access(stp->st_stid.sc_file, i);
1062                 clear_access(i, stp);
1063         }
1064 }
1065
1066 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1067 {
1068         kfree(sop->so_owner.data);
1069         sop->so_ops->so_free(sop);
1070 }
1071
1072 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1073 {
1074         struct nfs4_client *clp = sop->so_client;
1075
1076         might_lock(&clp->cl_lock);
1077
1078         if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1079                 return;
1080         sop->so_ops->so_unhash(sop);
1081         spin_unlock(&clp->cl_lock);
1082         nfs4_free_stateowner(sop);
1083 }
1084
1085 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1086 {
1087         struct nfs4_file *fp = stp->st_stid.sc_file;
1088
1089         lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1090
1091         if (list_empty(&stp->st_perfile))
1092                 return false;
1093
1094         spin_lock(&fp->fi_lock);
1095         list_del_init(&stp->st_perfile);
1096         spin_unlock(&fp->fi_lock);
1097         list_del(&stp->st_perstateowner);
1098         return true;
1099 }
1100
1101 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1102 {
1103         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1104
1105         put_clnt_odstate(stp->st_clnt_odstate);
1106         release_all_access(stp);
1107         if (stp->st_stateowner)
1108                 nfs4_put_stateowner(stp->st_stateowner);
1109         kmem_cache_free(stateid_slab, stid);
1110 }
1111
1112 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1113 {
1114         struct nfs4_ol_stateid *stp = openlockstateid(stid);
1115         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1116         struct file *file;
1117
1118         file = find_any_file(stp->st_stid.sc_file);
1119         if (file)
1120                 filp_close(file, (fl_owner_t)lo);
1121         nfs4_free_ol_stateid(stid);
1122 }
1123
1124 /*
1125  * Put the persistent reference to an already unhashed generic stateid, while
1126  * holding the cl_lock. If it's the last reference, then put it onto the
1127  * reaplist for later destruction.
1128  */
1129 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1130                                        struct list_head *reaplist)
1131 {
1132         struct nfs4_stid *s = &stp->st_stid;
1133         struct nfs4_client *clp = s->sc_client;
1134
1135         lockdep_assert_held(&clp->cl_lock);
1136
1137         WARN_ON_ONCE(!list_empty(&stp->st_locks));
1138
1139         if (!atomic_dec_and_test(&s->sc_count)) {
1140                 wake_up_all(&close_wq);
1141                 return;
1142         }
1143
1144         idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1145         list_add(&stp->st_locks, reaplist);
1146 }
1147
1148 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1149 {
1150         struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
1151
1152         lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
1153
1154         list_del_init(&stp->st_locks);
1155         nfs4_unhash_stid(&stp->st_stid);
1156         return unhash_ol_stateid(stp);
1157 }
1158
1159 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1160 {
1161         struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
1162         bool unhashed;
1163
1164         spin_lock(&oo->oo_owner.so_client->cl_lock);
1165         unhashed = unhash_lock_stateid(stp);
1166         spin_unlock(&oo->oo_owner.so_client->cl_lock);
1167         if (unhashed)
1168                 nfs4_put_stid(&stp->st_stid);
1169 }
1170
1171 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1172 {
1173         struct nfs4_client *clp = lo->lo_owner.so_client;
1174
1175         lockdep_assert_held(&clp->cl_lock);
1176
1177         list_del_init(&lo->lo_owner.so_strhash);
1178 }
1179
1180 /*
1181  * Free a list of generic stateids that were collected earlier after being
1182  * fully unhashed.
1183  */
1184 static void
1185 free_ol_stateid_reaplist(struct list_head *reaplist)
1186 {
1187         struct nfs4_ol_stateid *stp;
1188         struct nfs4_file *fp;
1189
1190         might_sleep();
1191
1192         while (!list_empty(reaplist)) {
1193                 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1194                                        st_locks);
1195                 list_del(&stp->st_locks);
1196                 fp = stp->st_stid.sc_file;
1197                 stp->st_stid.sc_free(&stp->st_stid);
1198                 if (fp)
1199                         put_nfs4_file(fp);
1200         }
1201 }
1202
1203 static void release_lockowner(struct nfs4_lockowner *lo)
1204 {
1205         struct nfs4_client *clp = lo->lo_owner.so_client;
1206         struct nfs4_ol_stateid *stp;
1207         struct list_head reaplist;
1208
1209         INIT_LIST_HEAD(&reaplist);
1210
1211         spin_lock(&clp->cl_lock);
1212         unhash_lockowner_locked(lo);
1213         while (!list_empty(&lo->lo_owner.so_stateids)) {
1214                 stp = list_first_entry(&lo->lo_owner.so_stateids,
1215                                 struct nfs4_ol_stateid, st_perstateowner);
1216                 WARN_ON(!unhash_lock_stateid(stp));
1217                 put_ol_stateid_locked(stp, &reaplist);
1218         }
1219         spin_unlock(&clp->cl_lock);
1220         free_ol_stateid_reaplist(&reaplist);
1221         nfs4_put_stateowner(&lo->lo_owner);
1222 }
1223
1224 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1225                                        struct list_head *reaplist)
1226 {
1227         struct nfs4_ol_stateid *stp;
1228
1229         lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1230
1231         while (!list_empty(&open_stp->st_locks)) {
1232                 stp = list_entry(open_stp->st_locks.next,
1233                                 struct nfs4_ol_stateid, st_locks);
1234                 WARN_ON(!unhash_lock_stateid(stp));
1235                 put_ol_stateid_locked(stp, reaplist);
1236         }
1237 }
1238
1239 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1240                                 struct list_head *reaplist)
1241 {
1242         bool unhashed;
1243
1244         lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1245
1246         unhashed = unhash_ol_stateid(stp);
1247         release_open_stateid_locks(stp, reaplist);
1248         return unhashed;
1249 }
1250
1251 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1252 {
1253         LIST_HEAD(reaplist);
1254
1255         spin_lock(&stp->st_stid.sc_client->cl_lock);
1256         if (unhash_open_stateid(stp, &reaplist))
1257                 put_ol_stateid_locked(stp, &reaplist);
1258         spin_unlock(&stp->st_stid.sc_client->cl_lock);
1259         free_ol_stateid_reaplist(&reaplist);
1260 }
1261
1262 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1263 {
1264         struct nfs4_client *clp = oo->oo_owner.so_client;
1265
1266         lockdep_assert_held(&clp->cl_lock);
1267
1268         list_del_init(&oo->oo_owner.so_strhash);
1269         list_del_init(&oo->oo_perclient);
1270 }
1271
1272 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1273 {
1274         struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1275                                           nfsd_net_id);
1276         struct nfs4_ol_stateid *s;
1277
1278         spin_lock(&nn->client_lock);
1279         s = oo->oo_last_closed_stid;
1280         if (s) {
1281                 list_del_init(&oo->oo_close_lru);
1282                 oo->oo_last_closed_stid = NULL;
1283         }
1284         spin_unlock(&nn->client_lock);
1285         if (s)
1286                 nfs4_put_stid(&s->st_stid);
1287 }
1288
1289 static void release_openowner(struct nfs4_openowner *oo)
1290 {
1291         struct nfs4_ol_stateid *stp;
1292         struct nfs4_client *clp = oo->oo_owner.so_client;
1293         struct list_head reaplist;
1294
1295         INIT_LIST_HEAD(&reaplist);
1296
1297         spin_lock(&clp->cl_lock);
1298         unhash_openowner_locked(oo);
1299         while (!list_empty(&oo->oo_owner.so_stateids)) {
1300                 stp = list_first_entry(&oo->oo_owner.so_stateids,
1301                                 struct nfs4_ol_stateid, st_perstateowner);
1302                 if (unhash_open_stateid(stp, &reaplist))
1303                         put_ol_stateid_locked(stp, &reaplist);
1304         }
1305         spin_unlock(&clp->cl_lock);
1306         free_ol_stateid_reaplist(&reaplist);
1307         release_last_closed_stateid(oo);
1308         nfs4_put_stateowner(&oo->oo_owner);
1309 }
1310
1311 static inline int
1312 hash_sessionid(struct nfs4_sessionid *sessionid)
1313 {
1314         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1315
1316         return sid->sequence % SESSION_HASH_SIZE;
1317 }
1318
1319 #ifdef CONFIG_SUNRPC_DEBUG
1320 static inline void
1321 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1322 {
1323         u32 *ptr = (u32 *)(&sessionid->data[0]);
1324         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1325 }
1326 #else
1327 static inline void
1328 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1329 {
1330 }
1331 #endif
1332
1333 /*
1334  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1335  * won't be used for replay.
1336  */
1337 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1338 {
1339         struct nfs4_stateowner *so = cstate->replay_owner;
1340
1341         if (nfserr == nfserr_replay_me)
1342                 return;
1343
1344         if (!seqid_mutating_err(ntohl(nfserr))) {
1345                 nfsd4_cstate_clear_replay(cstate);
1346                 return;
1347         }
1348         if (!so)
1349                 return;
1350         if (so->so_is_open_owner)
1351                 release_last_closed_stateid(openowner(so));
1352         so->so_seqid++;
1353         return;
1354 }
1355
1356 static void
1357 gen_sessionid(struct nfsd4_session *ses)
1358 {
1359         struct nfs4_client *clp = ses->se_client;
1360         struct nfsd4_sessionid *sid;
1361
1362         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1363         sid->clientid = clp->cl_clientid;
1364         sid->sequence = current_sessionid++;
1365         sid->reserved = 0;
1366 }
1367
1368 /*
1369  * The protocol defines ca_maxresponssize_cached to include the size of
1370  * the rpc header, but all we need to cache is the data starting after
1371  * the end of the initial SEQUENCE operation--the rest we regenerate
1372  * each time.  Therefore we can advertise a ca_maxresponssize_cached
1373  * value that is the number of bytes in our cache plus a few additional
1374  * bytes.  In order to stay on the safe side, and not promise more than
1375  * we can cache, those additional bytes must be the minimum possible: 24
1376  * bytes of rpc header (xid through accept state, with AUTH_NULL
1377  * verifier), 12 for the compound header (with zero-length tag), and 44
1378  * for the SEQUENCE op response:
1379  */
1380 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
1381
1382 static void
1383 free_session_slots(struct nfsd4_session *ses)
1384 {
1385         int i;
1386
1387         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
1388                 kfree(ses->se_slots[i]);
1389 }
1390
1391 /*
1392  * We don't actually need to cache the rpc and session headers, so we
1393  * can allocate a little less for each slot:
1394  */
1395 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1396 {
1397         u32 size;
1398
1399         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1400                 size = 0;
1401         else
1402                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1403         return size + sizeof(struct nfsd4_slot);
1404 }
1405
1406 /*
1407  * XXX: If we run out of reserved DRC memory we could (up to a point)
1408  * re-negotiate active sessions and reduce their slot usage to make
1409  * room for new connections. For now we just fail the create session.
1410  */
1411 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1412 {
1413         u32 slotsize = slot_bytes(ca);
1414         u32 num = ca->maxreqs;
1415         int avail;
1416
1417         spin_lock(&nfsd_drc_lock);
1418         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1419                     nfsd_drc_max_mem - nfsd_drc_mem_used);
1420         num = min_t(int, num, avail / slotsize);
1421         nfsd_drc_mem_used += num * slotsize;
1422         spin_unlock(&nfsd_drc_lock);
1423
1424         return num;
1425 }
1426
1427 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1428 {
1429         int slotsize = slot_bytes(ca);
1430
1431         spin_lock(&nfsd_drc_lock);
1432         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1433         spin_unlock(&nfsd_drc_lock);
1434 }
1435
1436 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1437                                            struct nfsd4_channel_attrs *battrs)
1438 {
1439         int numslots = fattrs->maxreqs;
1440         int slotsize = slot_bytes(fattrs);
1441         struct nfsd4_session *new;
1442         int mem, i;
1443
1444         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1445                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
1446         mem = numslots * sizeof(struct nfsd4_slot *);
1447
1448         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1449         if (!new)
1450                 return NULL;
1451         /* allocate each struct nfsd4_slot and data cache in one piece */
1452         for (i = 0; i < numslots; i++) {
1453                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1454                 if (!new->se_slots[i])
1455                         goto out_free;
1456         }
1457
1458         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1459         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1460
1461         return new;
1462 out_free:
1463         while (i--)
1464                 kfree(new->se_slots[i]);
1465         kfree(new);
1466         return NULL;
1467 }
1468
1469 static void free_conn(struct nfsd4_conn *c)
1470 {
1471         svc_xprt_put(c->cn_xprt);
1472         kfree(c);
1473 }
1474
1475 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1476 {
1477         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1478         struct nfs4_client *clp = c->cn_session->se_client;
1479
1480         spin_lock(&clp->cl_lock);
1481         if (!list_empty(&c->cn_persession)) {
1482                 list_del(&c->cn_persession);
1483                 free_conn(c);
1484         }
1485         nfsd4_probe_callback(clp);
1486         spin_unlock(&clp->cl_lock);
1487 }
1488
1489 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1490 {
1491         struct nfsd4_conn *conn;
1492
1493         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1494         if (!conn)
1495                 return NULL;
1496         svc_xprt_get(rqstp->rq_xprt);
1497         conn->cn_xprt = rqstp->rq_xprt;
1498         conn->cn_flags = flags;
1499         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1500         return conn;
1501 }
1502
1503 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1504 {
1505         conn->cn_session = ses;
1506         list_add(&conn->cn_persession, &ses->se_conns);
1507 }
1508
1509 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1510 {
1511         struct nfs4_client *clp = ses->se_client;
1512
1513         spin_lock(&clp->cl_lock);
1514         __nfsd4_hash_conn(conn, ses);
1515         spin_unlock(&clp->cl_lock);
1516 }
1517
1518 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1519 {
1520         conn->cn_xpt_user.callback = nfsd4_conn_lost;
1521         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1522 }
1523
1524 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1525 {
1526         int ret;
1527
1528         nfsd4_hash_conn(conn, ses);
1529         ret = nfsd4_register_conn(conn);
1530         if (ret)
1531                 /* oops; xprt is already down: */
1532                 nfsd4_conn_lost(&conn->cn_xpt_user);
1533         /* We may have gained or lost a callback channel: */
1534         nfsd4_probe_callback_sync(ses->se_client);
1535 }
1536
1537 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1538 {
1539         u32 dir = NFS4_CDFC4_FORE;
1540
1541         if (cses->flags & SESSION4_BACK_CHAN)
1542                 dir |= NFS4_CDFC4_BACK;
1543         return alloc_conn(rqstp, dir);
1544 }
1545
1546 /* must be called under client_lock */
1547 static void nfsd4_del_conns(struct nfsd4_session *s)
1548 {
1549         struct nfs4_client *clp = s->se_client;
1550         struct nfsd4_conn *c;
1551
1552         spin_lock(&clp->cl_lock);
1553         while (!list_empty(&s->se_conns)) {
1554                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1555                 list_del_init(&c->cn_persession);
1556                 spin_unlock(&clp->cl_lock);
1557
1558                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1559                 free_conn(c);
1560
1561                 spin_lock(&clp->cl_lock);
1562         }
1563         spin_unlock(&clp->cl_lock);
1564 }
1565
1566 static void __free_session(struct nfsd4_session *ses)
1567 {
1568         free_session_slots(ses);
1569         kfree(ses);
1570 }
1571
1572 static void free_session(struct nfsd4_session *ses)
1573 {
1574         nfsd4_del_conns(ses);
1575         nfsd4_put_drc_mem(&ses->se_fchannel);
1576         __free_session(ses);
1577 }
1578
1579 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1580 {
1581         int idx;
1582         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1583
1584         new->se_client = clp;
1585         gen_sessionid(new);
1586
1587         INIT_LIST_HEAD(&new->se_conns);
1588
1589         new->se_cb_seq_nr = 1;
1590         new->se_flags = cses->flags;
1591         new->se_cb_prog = cses->callback_prog;
1592         new->se_cb_sec = cses->cb_sec;
1593         atomic_set(&new->se_ref, 0);
1594         idx = hash_sessionid(&new->se_sessionid);
1595         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1596         spin_lock(&clp->cl_lock);
1597         list_add(&new->se_perclnt, &clp->cl_sessions);
1598         spin_unlock(&clp->cl_lock);
1599
1600         {
1601                 struct sockaddr *sa = svc_addr(rqstp);
1602                 /*
1603                  * This is a little silly; with sessions there's no real
1604                  * use for the callback address.  Use the peer address
1605                  * as a reasonable default for now, but consider fixing
1606                  * the rpc client not to require an address in the
1607                  * future:
1608                  */
1609                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1610                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1611         }
1612 }
1613
1614 /* caller must hold client_lock */
1615 static struct nfsd4_session *
1616 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1617 {
1618         struct nfsd4_session *elem;
1619         int idx;
1620         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1621
1622         lockdep_assert_held(&nn->client_lock);
1623
1624         dump_sessionid(__func__, sessionid);
1625         idx = hash_sessionid(sessionid);
1626         /* Search in the appropriate list */
1627         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1628                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1629                             NFS4_MAX_SESSIONID_LEN)) {
1630                         return elem;
1631                 }
1632         }
1633
1634         dprintk("%s: session not found\n", __func__);
1635         return NULL;
1636 }
1637
1638 static struct nfsd4_session *
1639 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1640                 __be32 *ret)
1641 {
1642         struct nfsd4_session *session;
1643         __be32 status = nfserr_badsession;
1644
1645         session = __find_in_sessionid_hashtbl(sessionid, net);
1646         if (!session)
1647                 goto out;
1648         status = nfsd4_get_session_locked(session);
1649         if (status)
1650                 session = NULL;
1651 out:
1652         *ret = status;
1653         return session;
1654 }
1655
1656 /* caller must hold client_lock */
1657 static void
1658 unhash_session(struct nfsd4_session *ses)
1659 {
1660         struct nfs4_client *clp = ses->se_client;
1661         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1662
1663         lockdep_assert_held(&nn->client_lock);
1664
1665         list_del(&ses->se_hash);
1666         spin_lock(&ses->se_client->cl_lock);
1667         list_del(&ses->se_perclnt);
1668         spin_unlock(&ses->se_client->cl_lock);
1669 }
1670
1671 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1672 static int
1673 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1674 {
1675         /*
1676          * We're assuming the clid was not given out from a boot
1677          * precisely 2^32 (about 136 years) before this one.  That seems
1678          * a safe assumption:
1679          */
1680         if (clid->cl_boot == (u32)nn->boot_time)
1681                 return 0;
1682         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1683                 clid->cl_boot, clid->cl_id, nn->boot_time);
1684         return 1;
1685 }
1686
1687 /*
1688  * XXX Should we use a slab cache ?
1689  * This type of memory management is somewhat inefficient, but we use it
1690  * anyway since SETCLIENTID is not a common operation.
1691  */
1692 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1693 {
1694         struct nfs4_client *clp;
1695         int i;
1696
1697         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1698         if (clp == NULL)
1699                 return NULL;
1700         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1701         if (clp->cl_name.data == NULL)
1702                 goto err_no_name;
1703         clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
1704                         OWNER_HASH_SIZE, GFP_KERNEL);
1705         if (!clp->cl_ownerstr_hashtbl)
1706                 goto err_no_hashtbl;
1707         for (i = 0; i < OWNER_HASH_SIZE; i++)
1708                 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1709         clp->cl_name.len = name.len;
1710         INIT_LIST_HEAD(&clp->cl_sessions);
1711         idr_init(&clp->cl_stateids);
1712         atomic_set(&clp->cl_refcount, 0);
1713         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1714         INIT_LIST_HEAD(&clp->cl_idhash);
1715         INIT_LIST_HEAD(&clp->cl_openowners);
1716         INIT_LIST_HEAD(&clp->cl_delegations);
1717         INIT_LIST_HEAD(&clp->cl_lru);
1718         INIT_LIST_HEAD(&clp->cl_revoked);
1719 #ifdef CONFIG_NFSD_PNFS
1720         INIT_LIST_HEAD(&clp->cl_lo_states);
1721 #endif
1722         spin_lock_init(&clp->cl_lock);
1723         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1724         return clp;
1725 err_no_hashtbl:
1726         kfree(clp->cl_name.data);
1727 err_no_name:
1728         kfree(clp);
1729         return NULL;
1730 }
1731
1732 static void
1733 free_client(struct nfs4_client *clp)
1734 {
1735         while (!list_empty(&clp->cl_sessions)) {
1736                 struct nfsd4_session *ses;
1737                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1738                                 se_perclnt);
1739                 list_del(&ses->se_perclnt);
1740                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1741                 free_session(ses);
1742         }
1743         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1744         free_svc_cred(&clp->cl_cred);
1745         kfree(clp->cl_ownerstr_hashtbl);
1746         kfree(clp->cl_name.data);
1747         idr_destroy(&clp->cl_stateids);
1748         kfree(clp);
1749 }
1750
1751 /* must be called under the client_lock */
1752 static void
1753 unhash_client_locked(struct nfs4_client *clp)
1754 {
1755         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1756         struct nfsd4_session *ses;
1757
1758         lockdep_assert_held(&nn->client_lock);
1759
1760         /* Mark the client as expired! */
1761         clp->cl_time = 0;
1762         /* Make it invisible */
1763         if (!list_empty(&clp->cl_idhash)) {
1764                 list_del_init(&clp->cl_idhash);
1765                 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1766                         rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1767                 else
1768                         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1769         }
1770         list_del_init(&clp->cl_lru);
1771         spin_lock(&clp->cl_lock);
1772         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1773                 list_del_init(&ses->se_hash);
1774         spin_unlock(&clp->cl_lock);
1775 }
1776
1777 static void
1778 unhash_client(struct nfs4_client *clp)
1779 {
1780         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1781
1782         spin_lock(&nn->client_lock);
1783         unhash_client_locked(clp);
1784         spin_unlock(&nn->client_lock);
1785 }
1786
1787 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1788 {
1789         if (atomic_read(&clp->cl_refcount))
1790                 return nfserr_jukebox;
1791         unhash_client_locked(clp);
1792         return nfs_ok;
1793 }
1794
1795 static void
1796 __destroy_client(struct nfs4_client *clp)
1797 {
1798         struct nfs4_openowner *oo;
1799         struct nfs4_delegation *dp;
1800         struct list_head reaplist;
1801
1802         INIT_LIST_HEAD(&reaplist);
1803         spin_lock(&state_lock);
1804         while (!list_empty(&clp->cl_delegations)) {
1805                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1806                 WARN_ON(!unhash_delegation_locked(dp));
1807                 list_add(&dp->dl_recall_lru, &reaplist);
1808         }
1809         spin_unlock(&state_lock);
1810         while (!list_empty(&reaplist)) {
1811                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1812                 list_del_init(&dp->dl_recall_lru);
1813                 put_clnt_odstate(dp->dl_clnt_odstate);
1814                 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
1815                 nfs4_put_stid(&dp->dl_stid);
1816         }
1817         while (!list_empty(&clp->cl_revoked)) {
1818                 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
1819                 list_del_init(&dp->dl_recall_lru);
1820                 nfs4_put_stid(&dp->dl_stid);
1821         }
1822         while (!list_empty(&clp->cl_openowners)) {
1823                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1824                 nfs4_get_stateowner(&oo->oo_owner);
1825                 release_openowner(oo);
1826         }
1827         nfsd4_return_all_client_layouts(clp);
1828         nfsd4_shutdown_callback(clp);
1829         if (clp->cl_cb_conn.cb_xprt)
1830                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1831         free_client(clp);
1832 }
1833
1834 static void
1835 destroy_client(struct nfs4_client *clp)
1836 {
1837         unhash_client(clp);
1838         __destroy_client(clp);
1839 }
1840
1841 static void expire_client(struct nfs4_client *clp)
1842 {
1843         unhash_client(clp);
1844         nfsd4_client_record_remove(clp);
1845         __destroy_client(clp);
1846 }
1847
1848 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1849 {
1850         memcpy(target->cl_verifier.data, source->data,
1851                         sizeof(target->cl_verifier.data));
1852 }
1853
1854 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1855 {
1856         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1857         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1858 }
1859
1860 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1861 {
1862         if (source->cr_principal) {
1863                 target->cr_principal =
1864                                 kstrdup(source->cr_principal, GFP_KERNEL);
1865                 if (target->cr_principal == NULL)
1866                         return -ENOMEM;
1867         } else
1868                 target->cr_principal = NULL;
1869         target->cr_flavor = source->cr_flavor;
1870         target->cr_uid = source->cr_uid;
1871         target->cr_gid = source->cr_gid;
1872         target->cr_group_info = source->cr_group_info;
1873         get_group_info(target->cr_group_info);
1874         target->cr_gss_mech = source->cr_gss_mech;
1875         if (source->cr_gss_mech)
1876                 gss_mech_get(source->cr_gss_mech);
1877         return 0;
1878 }
1879
1880 static int
1881 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1882 {
1883         if (o1->len < o2->len)
1884                 return -1;
1885         if (o1->len > o2->len)
1886                 return 1;
1887         return memcmp(o1->data, o2->data, o1->len);
1888 }
1889
1890 static int same_name(const char *n1, const char *n2)
1891 {
1892         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1893 }
1894
1895 static int
1896 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1897 {
1898         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1899 }
1900
1901 static int
1902 same_clid(clientid_t *cl1, clientid_t *cl2)
1903 {
1904         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1905 }
1906
1907 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1908 {
1909         int i;
1910
1911         if (g1->ngroups != g2->ngroups)
1912                 return false;
1913         for (i=0; i<g1->ngroups; i++)
1914                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1915                         return false;
1916         return true;
1917 }
1918
1919 /*
1920  * RFC 3530 language requires clid_inuse be returned when the
1921  * "principal" associated with a requests differs from that previously
1922  * used.  We use uid, gid's, and gss principal string as our best
1923  * approximation.  We also don't want to allow non-gss use of a client
1924  * established using gss: in theory cr_principal should catch that
1925  * change, but in practice cr_principal can be null even in the gss case
1926  * since gssd doesn't always pass down a principal string.
1927  */
1928 static bool is_gss_cred(struct svc_cred *cr)
1929 {
1930         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1931         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1932 }
1933
1934
1935 static bool
1936 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1937 {
1938         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1939                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1940                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1941                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1942                 return false;
1943         if (cr1->cr_principal == cr2->cr_principal)
1944                 return true;
1945         if (!cr1->cr_principal || !cr2->cr_principal)
1946                 return false;
1947         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1948 }
1949
1950 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1951 {
1952         struct svc_cred *cr = &rqstp->rq_cred;
1953         u32 service;
1954
1955         if (!cr->cr_gss_mech)
1956                 return false;
1957         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1958         return service == RPC_GSS_SVC_INTEGRITY ||
1959                service == RPC_GSS_SVC_PRIVACY;
1960 }
1961
1962 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1963 {
1964         struct svc_cred *cr = &rqstp->rq_cred;
1965
1966         if (!cl->cl_mach_cred)
1967                 return true;
1968         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1969                 return false;
1970         if (!svc_rqst_integrity_protected(rqstp))
1971                 return false;
1972         if (!cr->cr_principal)
1973                 return false;
1974         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1975 }
1976
1977 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
1978 {
1979         __be32 verf[2];
1980
1981         /*
1982          * This is opaque to client, so no need to byte-swap. Use
1983          * __force to keep sparse happy
1984          */
1985         verf[0] = (__force __be32)get_seconds();
1986         verf[1] = (__force __be32)nn->clverifier_counter++;
1987         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1988 }
1989
1990 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1991 {
1992         clp->cl_clientid.cl_boot = nn->boot_time;
1993         clp->cl_clientid.cl_id = nn->clientid_counter++;
1994         gen_confirm(clp, nn);
1995 }
1996
1997 static struct nfs4_stid *
1998 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
1999 {
2000         struct nfs4_stid *ret;
2001
2002         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2003         if (!ret || !ret->sc_type)
2004                 return NULL;
2005         return ret;
2006 }
2007
2008 static struct nfs4_stid *
2009 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2010 {
2011         struct nfs4_stid *s;
2012
2013         spin_lock(&cl->cl_lock);
2014         s = find_stateid_locked(cl, t);
2015         if (s != NULL) {
2016                 if (typemask & s->sc_type)
2017                         atomic_inc(&s->sc_count);
2018                 else
2019                         s = NULL;
2020         }
2021         spin_unlock(&cl->cl_lock);
2022         return s;
2023 }
2024
2025 static struct nfs4_client *create_client(struct xdr_netobj name,
2026                 struct svc_rqst *rqstp, nfs4_verifier *verf)
2027 {
2028         struct nfs4_client *clp;
2029         struct sockaddr *sa = svc_addr(rqstp);
2030         int ret;
2031         struct net *net = SVC_NET(rqstp);
2032
2033         clp = alloc_client(name);
2034         if (clp == NULL)
2035                 return NULL;
2036
2037         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2038         if (ret) {
2039                 free_client(clp);
2040                 return NULL;
2041         }
2042         nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2043         clp->cl_time = get_seconds();
2044         clear_bit(0, &clp->cl_cb_slot_busy);
2045         copy_verf(clp, verf);
2046         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
2047         clp->cl_cb_session = NULL;
2048         clp->net = net;
2049         return clp;
2050 }
2051
2052 static void
2053 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2054 {
2055         struct rb_node **new = &(root->rb_node), *parent = NULL;
2056         struct nfs4_client *clp;
2057
2058         while (*new) {
2059                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2060                 parent = *new;
2061
2062                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2063                         new = &((*new)->rb_left);
2064                 else
2065                         new = &((*new)->rb_right);
2066         }
2067
2068         rb_link_node(&new_clp->cl_namenode, parent, new);
2069         rb_insert_color(&new_clp->cl_namenode, root);
2070 }
2071
2072 static struct nfs4_client *
2073 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2074 {
2075         int cmp;
2076         struct rb_node *node = root->rb_node;
2077         struct nfs4_client *clp;
2078
2079         while (node) {
2080                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2081                 cmp = compare_blob(&clp->cl_name, name);
2082                 if (cmp > 0)
2083                         node = node->rb_left;
2084                 else if (cmp < 0)
2085                         node = node->rb_right;
2086                 else
2087                         return clp;
2088         }
2089         return NULL;
2090 }
2091
2092 static void
2093 add_to_unconfirmed(struct nfs4_client *clp)
2094 {
2095         unsigned int idhashval;
2096         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2097
2098         lockdep_assert_held(&nn->client_lock);
2099
2100         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2101         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2102         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2103         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2104         renew_client_locked(clp);
2105 }
2106
2107 static void
2108 move_to_confirmed(struct nfs4_client *clp)
2109 {
2110         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2111         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2112
2113         lockdep_assert_held(&nn->client_lock);
2114
2115         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2116         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2117         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2118         add_clp_to_name_tree(clp, &nn->conf_name_tree);
2119         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2120         renew_client_locked(clp);
2121 }
2122
2123 static struct nfs4_client *
2124 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2125 {
2126         struct nfs4_client *clp;
2127         unsigned int idhashval = clientid_hashval(clid->cl_id);
2128
2129         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2130                 if (same_clid(&clp->cl_clientid, clid)) {
2131                         if ((bool)clp->cl_minorversion != sessions)
2132                                 return NULL;
2133                         renew_client_locked(clp);
2134                         return clp;
2135                 }
2136         }
2137         return NULL;
2138 }
2139
2140 static struct nfs4_client *
2141 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2142 {
2143         struct list_head *tbl = nn->conf_id_hashtbl;
2144
2145         lockdep_assert_held(&nn->client_lock);
2146         return find_client_in_id_table(tbl, clid, sessions);
2147 }
2148
2149 static struct nfs4_client *
2150 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2151 {
2152         struct list_head *tbl = nn->unconf_id_hashtbl;
2153
2154         lockdep_assert_held(&nn->client_lock);
2155         return find_client_in_id_table(tbl, clid, sessions);
2156 }
2157
2158 static bool clp_used_exchangeid(struct nfs4_client *clp)
2159 {
2160         return clp->cl_exchange_flags != 0;
2161 }
2162
2163 static struct nfs4_client *
2164 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2165 {
2166         lockdep_assert_held(&nn->client_lock);
2167         return find_clp_in_name_tree(name, &nn->conf_name_tree);
2168 }
2169
2170 static struct nfs4_client *
2171 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2172 {
2173         lockdep_assert_held(&nn->client_lock);
2174         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2175 }
2176
2177 static void
2178 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2179 {
2180         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2181         struct sockaddr *sa = svc_addr(rqstp);
2182         u32 scopeid = rpc_get_scope_id(sa);
2183         unsigned short expected_family;
2184
2185         /* Currently, we only support tcp and tcp6 for the callback channel */
2186         if (se->se_callback_netid_len == 3 &&
2187             !memcmp(se->se_callback_netid_val, "tcp", 3))
2188                 expected_family = AF_INET;
2189         else if (se->se_callback_netid_len == 4 &&
2190                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
2191                 expected_family = AF_INET6;
2192         else
2193                 goto out_err;
2194
2195         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2196                                             se->se_callback_addr_len,
2197                                             (struct sockaddr *)&conn->cb_addr,
2198                                             sizeof(conn->cb_addr));
2199
2200         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2201                 goto out_err;
2202
2203         if (conn->cb_addr.ss_family == AF_INET6)
2204                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2205
2206         conn->cb_prog = se->se_callback_prog;
2207         conn->cb_ident = se->se_callback_ident;
2208         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2209         return;
2210 out_err:
2211         conn->cb_addr.ss_family = AF_UNSPEC;
2212         conn->cb_addrlen = 0;
2213         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
2214                 "will not receive delegations\n",
2215                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2216
2217         return;
2218 }
2219
2220 /*
2221  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2222  */
2223 static void
2224 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2225 {
2226         struct xdr_buf *buf = resp->xdr.buf;
2227         struct nfsd4_slot *slot = resp->cstate.slot;
2228         unsigned int base;
2229
2230         dprintk("--> %s slot %p\n", __func__, slot);
2231
2232         slot->sl_opcnt = resp->opcnt;
2233         slot->sl_status = resp->cstate.status;
2234
2235         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2236         if (nfsd4_not_cached(resp)) {
2237                 slot->sl_datalen = 0;
2238                 return;
2239         }
2240         base = resp->cstate.data_offset;
2241         slot->sl_datalen = buf->len - base;
2242         if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2243                 WARN("%s: sessions DRC could not cache compound\n", __func__);
2244         return;
2245 }
2246
2247 /*
2248  * Encode the replay sequence operation from the slot values.
2249  * If cachethis is FALSE encode the uncached rep error on the next
2250  * operation which sets resp->p and increments resp->opcnt for
2251  * nfs4svc_encode_compoundres.
2252  *
2253  */
2254 static __be32
2255 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2256                           struct nfsd4_compoundres *resp)
2257 {
2258         struct nfsd4_op *op;
2259         struct nfsd4_slot *slot = resp->cstate.slot;
2260
2261         /* Encode the replayed sequence operation */
2262         op = &args->ops[resp->opcnt - 1];
2263         nfsd4_encode_operation(resp, op);
2264
2265         /* Return nfserr_retry_uncached_rep in next operation. */
2266         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
2267                 op = &args->ops[resp->opcnt++];
2268                 op->status = nfserr_retry_uncached_rep;
2269                 nfsd4_encode_operation(resp, op);
2270         }
2271         return op->status;
2272 }
2273
2274 /*
2275  * The sequence operation is not cached because we can use the slot and
2276  * session values.
2277  */
2278 static __be32
2279 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2280                          struct nfsd4_sequence *seq)
2281 {
2282         struct nfsd4_slot *slot = resp->cstate.slot;
2283         struct xdr_stream *xdr = &resp->xdr;
2284         __be32 *p;
2285         __be32 status;
2286
2287         dprintk("--> %s slot %p\n", __func__, slot);
2288
2289         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2290         if (status)
2291                 return status;
2292
2293         p = xdr_reserve_space(xdr, slot->sl_datalen);
2294         if (!p) {
2295                 WARN_ON_ONCE(1);
2296                 return nfserr_serverfault;
2297         }
2298         xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2299         xdr_commit_encode(xdr);
2300
2301         resp->opcnt = slot->sl_opcnt;
2302         return slot->sl_status;
2303 }
2304
2305 /*
2306  * Set the exchange_id flags returned by the server.
2307  */
2308 static void
2309 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2310 {
2311 #ifdef CONFIG_NFSD_PNFS
2312         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2313 #else
2314         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2315 #endif
2316
2317         /* Referrals are supported, Migration is not. */
2318         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2319
2320         /* set the wire flags to return to client. */
2321         clid->flags = new->cl_exchange_flags;
2322 }
2323
2324 static bool client_has_openowners(struct nfs4_client *clp)
2325 {
2326         struct nfs4_openowner *oo;
2327
2328         list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2329                 if (!list_empty(&oo->oo_owner.so_stateids))
2330                         return true;
2331         }
2332         return false;
2333 }
2334
2335 static bool client_has_state(struct nfs4_client *clp)
2336 {
2337         return client_has_openowners(clp)
2338 #ifdef CONFIG_NFSD_PNFS
2339                 || !list_empty(&clp->cl_lo_states)
2340 #endif
2341                 || !list_empty(&clp->cl_delegations)
2342                 || !list_empty(&clp->cl_sessions);
2343 }
2344
2345 __be32
2346 nfsd4_exchange_id(struct svc_rqst *rqstp,
2347                   struct nfsd4_compound_state *cstate,
2348                   struct nfsd4_exchange_id *exid)
2349 {
2350         struct nfs4_client *conf, *new;
2351         struct nfs4_client *unconf = NULL;
2352         __be32 status;
2353         char                    addr_str[INET6_ADDRSTRLEN];
2354         nfs4_verifier           verf = exid->verifier;
2355         struct sockaddr         *sa = svc_addr(rqstp);
2356         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2357         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2358
2359         rpc_ntop(sa, addr_str, sizeof(addr_str));
2360         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2361                 "ip_addr=%s flags %x, spa_how %d\n",
2362                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2363                 addr_str, exid->flags, exid->spa_how);
2364
2365         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2366                 return nfserr_inval;
2367
2368         switch (exid->spa_how) {
2369         case SP4_MACH_CRED:
2370                 if (!svc_rqst_integrity_protected(rqstp))
2371                         return nfserr_inval;
2372         case SP4_NONE:
2373                 break;
2374         default:                                /* checked by xdr code */
2375                 WARN_ON_ONCE(1);
2376         case SP4_SSV:
2377                 return nfserr_encr_alg_unsupp;
2378         }
2379
2380         new = create_client(exid->clname, rqstp, &verf);
2381         if (new == NULL)
2382                 return nfserr_jukebox;
2383
2384         /* Cases below refer to rfc 5661 section 18.35.4: */
2385         spin_lock(&nn->client_lock);
2386         conf = find_confirmed_client_by_name(&exid->clname, nn);
2387         if (conf) {
2388                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2389                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2390
2391                 if (update) {
2392                         if (!clp_used_exchangeid(conf)) { /* buggy client */
2393                                 status = nfserr_inval;
2394                                 goto out;
2395                         }
2396                         if (!mach_creds_match(conf, rqstp)) {
2397                                 status = nfserr_wrong_cred;
2398                                 goto out;
2399                         }
2400                         if (!creds_match) { /* case 9 */
2401                                 status = nfserr_perm;
2402                                 goto out;
2403                         }
2404                         if (!verfs_match) { /* case 8 */
2405                                 status = nfserr_not_same;
2406                                 goto out;
2407                         }
2408                         /* case 6 */
2409                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2410                         goto out_copy;
2411                 }
2412                 if (!creds_match) { /* case 3 */
2413                         if (client_has_state(conf)) {
2414                                 status = nfserr_clid_inuse;
2415                                 goto out;
2416                         }
2417                         goto out_new;
2418                 }
2419                 if (verfs_match) { /* case 2 */
2420                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2421                         goto out_copy;
2422                 }
2423                 /* case 5, client reboot */
2424                 conf = NULL;
2425                 goto out_new;
2426         }
2427
2428         if (update) { /* case 7 */
2429                 status = nfserr_noent;
2430                 goto out;
2431         }
2432
2433         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
2434         if (unconf) /* case 4, possible retry or client restart */
2435                 unhash_client_locked(unconf);
2436
2437         /* case 1 (normal case) */
2438 out_new:
2439         if (conf) {
2440                 status = mark_client_expired_locked(conf);
2441                 if (status)
2442                         goto out;
2443         }
2444         new->cl_minorversion = cstate->minorversion;
2445         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
2446
2447         gen_clid(new, nn);
2448         add_to_unconfirmed(new);
2449         swap(new, conf);
2450 out_copy:
2451         exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2452         exid->clientid.cl_id = conf->cl_clientid.cl_id;
2453
2454         exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2455         nfsd4_set_ex_flags(conf, exid);
2456
2457         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2458                 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2459         status = nfs_ok;
2460
2461 out:
2462         spin_unlock(&nn->client_lock);
2463         if (new)
2464                 expire_client(new);
2465         if (unconf)
2466                 expire_client(unconf);
2467         return status;
2468 }
2469
2470 static __be32
2471 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2472 {
2473         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2474                 slot_seqid);
2475
2476         /* The slot is in use, and no response has been sent. */
2477         if (slot_inuse) {
2478                 if (seqid == slot_seqid)
2479                         return nfserr_jukebox;
2480                 else
2481                         return nfserr_seq_misordered;
2482         }
2483         /* Note unsigned 32-bit arithmetic handles wraparound: */
2484         if (likely(seqid == slot_seqid + 1))
2485                 return nfs_ok;
2486         if (seqid == slot_seqid)
2487                 return nfserr_replay_cache;
2488         return nfserr_seq_misordered;
2489 }
2490
2491 /*
2492  * Cache the create session result into the create session single DRC
2493  * slot cache by saving the xdr structure. sl_seqid has been set.
2494  * Do this for solo or embedded create session operations.
2495  */
2496 static void
2497 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2498                            struct nfsd4_clid_slot *slot, __be32 nfserr)
2499 {
2500         slot->sl_status = nfserr;
2501         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2502 }
2503
2504 static __be32
2505 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2506                             struct nfsd4_clid_slot *slot)
2507 {
2508         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2509         return slot->sl_status;
2510 }
2511
2512 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2513                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2514                         1 +     /* MIN tag is length with zero, only length */ \
2515                         3 +     /* version, opcount, opcode */ \
2516                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2517                                 /* seqid, slotID, slotID, cache */ \
2518                         4 ) * sizeof(__be32))
2519
2520 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2521                         2 +     /* verifier: AUTH_NULL, length 0 */\
2522                         1 +     /* status */ \
2523                         1 +     /* MIN tag is length with zero, only length */ \
2524                         3 +     /* opcount, opcode, opstatus*/ \
2525                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2526                                 /* seqid, slotID, slotID, slotID, status */ \
2527                         5 ) * sizeof(__be32))
2528
2529 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2530 {
2531         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2532
2533         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2534                 return nfserr_toosmall;
2535         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2536                 return nfserr_toosmall;
2537         ca->headerpadsz = 0;
2538         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2539         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2540         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2541         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2542                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2543         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2544         /*
2545          * Note decreasing slot size below client's request may make it
2546          * difficult for client to function correctly, whereas
2547          * decreasing the number of slots will (just?) affect
2548          * performance.  When short on memory we therefore prefer to
2549          * decrease number of slots instead of their size.  Clients that
2550          * request larger slots than they need will get poor results:
2551          */
2552         ca->maxreqs = nfsd4_get_drc_mem(ca);
2553         if (!ca->maxreqs)
2554                 return nfserr_jukebox;
2555
2556         return nfs_ok;
2557 }
2558
2559 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
2560                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
2561 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
2562                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
2563
2564 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2565 {
2566         ca->headerpadsz = 0;
2567
2568         /*
2569          * These RPC_MAX_HEADER macros are overkill, especially since we
2570          * don't even do gss on the backchannel yet.  But this is still
2571          * less than 1k.  Tighten up this estimate in the unlikely event
2572          * it turns out to be a problem for some client:
2573          */
2574         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2575                 return nfserr_toosmall;
2576         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2577                 return nfserr_toosmall;
2578         ca->maxresp_cached = 0;
2579         if (ca->maxops < 2)
2580                 return nfserr_toosmall;
2581
2582         return nfs_ok;
2583 }
2584
2585 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2586 {
2587         switch (cbs->flavor) {
2588         case RPC_AUTH_NULL:
2589         case RPC_AUTH_UNIX:
2590                 return nfs_ok;
2591         default:
2592                 /*
2593                  * GSS case: the spec doesn't allow us to return this
2594                  * error.  But it also doesn't allow us not to support
2595                  * GSS.
2596                  * I'd rather this fail hard than return some error the
2597                  * client might think it can already handle:
2598                  */
2599                 return nfserr_encr_alg_unsupp;
2600         }
2601 }
2602
2603 __be32
2604 nfsd4_create_session(struct svc_rqst *rqstp,
2605                      struct nfsd4_compound_state *cstate,
2606                      struct nfsd4_create_session *cr_ses)
2607 {
2608         struct sockaddr *sa = svc_addr(rqstp);
2609         struct nfs4_client *conf, *unconf;
2610         struct nfs4_client *old = NULL;
2611         struct nfsd4_session *new;
2612         struct nfsd4_conn *conn;
2613         struct nfsd4_clid_slot *cs_slot = NULL;
2614         __be32 status = 0;
2615         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2616
2617         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2618                 return nfserr_inval;
2619         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2620         if (status)
2621                 return status;
2622         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2623         if (status)
2624                 return status;
2625         status = check_backchannel_attrs(&cr_ses->back_channel);
2626         if (status)
2627                 goto out_release_drc_mem;
2628         status = nfserr_jukebox;
2629         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2630         if (!new)
2631                 goto out_release_drc_mem;
2632         conn = alloc_conn_from_crses(rqstp, cr_ses);
2633         if (!conn)
2634                 goto out_free_session;
2635
2636         spin_lock(&nn->client_lock);
2637         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2638         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2639         WARN_ON_ONCE(conf && unconf);
2640
2641         if (conf) {
2642                 status = nfserr_wrong_cred;
2643                 if (!mach_creds_match(conf, rqstp))
2644                         goto out_free_conn;
2645                 cs_slot = &conf->cl_cs_slot;
2646                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2647                 if (status) {
2648                         if (status == nfserr_replay_cache)
2649                                 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2650                         goto out_free_conn;
2651                 }
2652         } else if (unconf) {
2653                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2654                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2655                         status = nfserr_clid_inuse;
2656                         goto out_free_conn;
2657                 }
2658                 status = nfserr_wrong_cred;
2659                 if (!mach_creds_match(unconf, rqstp))
2660                         goto out_free_conn;
2661                 cs_slot = &unconf->cl_cs_slot;
2662                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2663                 if (status) {
2664                         /* an unconfirmed replay returns misordered */
2665                         status = nfserr_seq_misordered;
2666                         goto out_free_conn;
2667                 }
2668                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2669                 if (old) {
2670                         status = mark_client_expired_locked(old);
2671                         if (status) {
2672                                 old = NULL;
2673                                 goto out_free_conn;
2674                         }
2675                 }
2676                 move_to_confirmed(unconf);
2677                 conf = unconf;
2678         } else {
2679                 status = nfserr_stale_clientid;
2680                 goto out_free_conn;
2681         }
2682         status = nfs_ok;
2683         /*
2684          * We do not support RDMA or persistent sessions
2685          */
2686         cr_ses->flags &= ~SESSION4_PERSIST;
2687         cr_ses->flags &= ~SESSION4_RDMA;
2688
2689         init_session(rqstp, new, conf, cr_ses);
2690         nfsd4_get_session_locked(new);
2691
2692         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2693                NFS4_MAX_SESSIONID_LEN);
2694         cs_slot->sl_seqid++;
2695         cr_ses->seqid = cs_slot->sl_seqid;
2696
2697         /* cache solo and embedded create sessions under the client_lock */
2698         nfsd4_cache_create_session(cr_ses, cs_slot, status);
2699         spin_unlock(&nn->client_lock);
2700         /* init connection and backchannel */
2701         nfsd4_init_conn(rqstp, conn, new);
2702         nfsd4_put_session(new);
2703         if (old)
2704                 expire_client(old);
2705         return status;
2706 out_free_conn:
2707         spin_unlock(&nn->client_lock);
2708         free_conn(conn);
2709         if (old)
2710                 expire_client(old);
2711 out_free_session:
2712         __free_session(new);
2713 out_release_drc_mem:
2714         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2715         return status;
2716 }
2717
2718 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2719 {
2720         switch (*dir) {
2721         case NFS4_CDFC4_FORE:
2722         case NFS4_CDFC4_BACK:
2723                 return nfs_ok;
2724         case NFS4_CDFC4_FORE_OR_BOTH:
2725         case NFS4_CDFC4_BACK_OR_BOTH:
2726                 *dir = NFS4_CDFC4_BOTH;
2727                 return nfs_ok;
2728         };
2729         return nfserr_inval;
2730 }
2731
2732 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2733 {
2734         struct nfsd4_session *session = cstate->session;
2735         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2736         __be32 status;
2737
2738         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2739         if (status)
2740                 return status;
2741         spin_lock(&nn->client_lock);
2742         session->se_cb_prog = bc->bc_cb_program;
2743         session->se_cb_sec = bc->bc_cb_sec;
2744         spin_unlock(&nn->client_lock);
2745
2746         nfsd4_probe_callback(session->se_client);
2747
2748         return nfs_ok;
2749 }
2750
2751 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2752                      struct nfsd4_compound_state *cstate,
2753                      struct nfsd4_bind_conn_to_session *bcts)
2754 {
2755         __be32 status;
2756         struct nfsd4_conn *conn;
2757         struct nfsd4_session *session;
2758         struct net *net = SVC_NET(rqstp);
2759         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2760
2761         if (!nfsd4_last_compound_op(rqstp))
2762                 return nfserr_not_only_op;
2763         spin_lock(&nn->client_lock);
2764         session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2765         spin_unlock(&nn->client_lock);
2766         if (!session)
2767                 goto out_no_session;
2768         status = nfserr_wrong_cred;
2769         if (!mach_creds_match(session->se_client, rqstp))
2770                 goto out;
2771         status = nfsd4_map_bcts_dir(&bcts->dir);
2772         if (status)
2773                 goto out;
2774         conn = alloc_conn(rqstp, bcts->dir);
2775         status = nfserr_jukebox;
2776         if (!conn)
2777                 goto out;
2778         nfsd4_init_conn(rqstp, conn, session);
2779         status = nfs_ok;
2780 out:
2781         nfsd4_put_session(session);
2782 out_no_session:
2783         return status;
2784 }
2785
2786 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2787 {
2788         if (!session)
2789                 return 0;
2790         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2791 }
2792
2793 __be32
2794 nfsd4_destroy_session(struct svc_rqst *r,
2795                       struct nfsd4_compound_state *cstate,
2796                       struct nfsd4_destroy_session *sessionid)
2797 {
2798         struct nfsd4_session *ses;
2799         __be32 status;
2800         int ref_held_by_me = 0;
2801         struct net *net = SVC_NET(r);
2802         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2803
2804         status = nfserr_not_only_op;
2805         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2806                 if (!nfsd4_last_compound_op(r))
2807                         goto out;
2808                 ref_held_by_me++;
2809         }
2810         dump_sessionid(__func__, &sessionid->sessionid);
2811         spin_lock(&nn->client_lock);
2812         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2813         if (!ses)
2814                 goto out_client_lock;
2815         status = nfserr_wrong_cred;
2816         if (!mach_creds_match(ses->se_client, r))
2817                 goto out_put_session;
2818         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2819         if (status)
2820                 goto out_put_session;
2821         unhash_session(ses);
2822         spin_unlock(&nn->client_lock);
2823
2824         nfsd4_probe_callback_sync(ses->se_client);
2825
2826         spin_lock(&nn->client_lock);
2827         status = nfs_ok;
2828 out_put_session:
2829         nfsd4_put_session_locked(ses);
2830 out_client_lock:
2831         spin_unlock(&nn->client_lock);
2832 out:
2833         return status;
2834 }
2835
2836 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2837 {
2838         struct nfsd4_conn *c;
2839
2840         list_for_each_entry(c, &s->se_conns, cn_persession) {
2841                 if (c->cn_xprt == xpt) {
2842                         return c;
2843                 }
2844         }
2845         return NULL;
2846 }
2847
2848 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2849 {
2850         struct nfs4_client *clp = ses->se_client;
2851         struct nfsd4_conn *c;
2852         __be32 status = nfs_ok;
2853         int ret;
2854
2855         spin_lock(&clp->cl_lock);
2856         c = __nfsd4_find_conn(new->cn_xprt, ses);
2857         if (c)
2858                 goto out_free;
2859         status = nfserr_conn_not_bound_to_session;
2860         if (clp->cl_mach_cred)
2861                 goto out_free;
2862         __nfsd4_hash_conn(new, ses);
2863         spin_unlock(&clp->cl_lock);
2864         ret = nfsd4_register_conn(new);
2865         if (ret)
2866                 /* oops; xprt is already down: */
2867                 nfsd4_conn_lost(&new->cn_xpt_user);
2868         return nfs_ok;
2869 out_free:
2870         spin_unlock(&clp->cl_lock);
2871         free_conn(new);
2872         return status;
2873 }
2874
2875 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2876 {
2877         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2878
2879         return args->opcnt > session->se_fchannel.maxops;
2880 }
2881
2882 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2883                                   struct nfsd4_session *session)
2884 {
2885         struct xdr_buf *xb = &rqstp->rq_arg;
2886
2887         return xb->len > session->se_fchannel.maxreq_sz;
2888 }
2889
2890 __be32
2891 nfsd4_sequence(struct svc_rqst *rqstp,
2892                struct nfsd4_compound_state *cstate,
2893                struct nfsd4_sequence *seq)
2894 {
2895         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2896         struct xdr_stream *xdr = &resp->xdr;
2897         struct nfsd4_session *session;
2898         struct nfs4_client *clp;
2899         struct nfsd4_slot *slot;
2900         struct nfsd4_conn *conn;
2901         __be32 status;
2902         int buflen;
2903         struct net *net = SVC_NET(rqstp);
2904         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2905
2906         if (resp->opcnt != 1)
2907                 return nfserr_sequence_pos;
2908
2909         /*
2910          * Will be either used or freed by nfsd4_sequence_check_conn
2911          * below.
2912          */
2913         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2914         if (!conn)
2915                 return nfserr_jukebox;
2916
2917         spin_lock(&nn->client_lock);
2918         session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
2919         if (!session)
2920                 goto out_no_session;
2921         clp = session->se_client;
2922
2923         status = nfserr_too_many_ops;
2924         if (nfsd4_session_too_many_ops(rqstp, session))
2925                 goto out_put_session;
2926
2927         status = nfserr_req_too_big;
2928         if (nfsd4_request_too_big(rqstp, session))
2929                 goto out_put_session;
2930
2931         status = nfserr_badslot;
2932         if (seq->slotid >= session->se_fchannel.maxreqs)
2933                 goto out_put_session;
2934
2935         slot = session->se_slots[seq->slotid];
2936         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2937
2938         /* We do not negotiate the number of slots yet, so set the
2939          * maxslots to the session maxreqs which is used to encode
2940          * sr_highest_slotid and the sr_target_slot id to maxslots */
2941         seq->maxslots = session->se_fchannel.maxreqs;
2942
2943         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2944                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2945         if (status == nfserr_replay_cache) {
2946                 status = nfserr_seq_misordered;
2947                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2948                         goto out_put_session;
2949                 cstate->slot = slot;
2950                 cstate->session = session;
2951                 cstate->clp = clp;
2952                 /* Return the cached reply status and set cstate->status
2953                  * for nfsd4_proc_compound processing */
2954                 status = nfsd4_replay_cache_entry(resp, seq);
2955                 cstate->status = nfserr_replay_cache;
2956                 goto out;
2957         }
2958         if (status)
2959                 goto out_put_session;
2960
2961         status = nfsd4_sequence_check_conn(conn, session);
2962         conn = NULL;
2963         if (status)
2964                 goto out_put_session;
2965
2966         buflen = (seq->cachethis) ?
2967                         session->se_fchannel.maxresp_cached :
2968                         session->se_fchannel.maxresp_sz;
2969         status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
2970                                     nfserr_rep_too_big;
2971         if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
2972                 goto out_put_session;
2973         svc_reserve(rqstp, buflen);
2974
2975         status = nfs_ok;
2976         /* Success! bump slot seqid */
2977         slot->sl_seqid = seq->seqid;
2978         slot->sl_flags |= NFSD4_SLOT_INUSE;
2979         if (seq->cachethis)
2980                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2981         else
2982                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2983
2984         cstate->slot = slot;
2985         cstate->session = session;
2986         cstate->clp = clp;
2987
2988 out:
2989         switch (clp->cl_cb_state) {
2990         case NFSD4_CB_DOWN:
2991                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2992                 break;
2993         case NFSD4_CB_FAULT:
2994                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2995                 break;
2996         default:
2997                 seq->status_flags = 0;
2998         }
2999         if (!list_empty(&clp->cl_revoked))
3000                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3001 out_no_session:
3002         if (conn)
3003                 free_conn(conn);
3004         spin_unlock(&nn->client_lock);
3005         return status;
3006 out_put_session:
3007         nfsd4_put_session_locked(session);
3008         goto out_no_session;
3009 }
3010
3011 void
3012 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3013 {
3014         struct nfsd4_compound_state *cs = &resp->cstate;
3015
3016         if (nfsd4_has_session(cs)) {
3017                 if (cs->status != nfserr_replay_cache) {
3018                         nfsd4_store_cache_entry(resp);
3019                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3020                 }
3021                 /* Drop session reference that was taken in nfsd4_sequence() */
3022                 nfsd4_put_session(cs->session);
3023         } else if (cs->clp)
3024                 put_client_renew(cs->clp);
3025 }
3026
3027 __be32
3028 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
3029 {
3030         struct nfs4_client *conf, *unconf;
3031         struct nfs4_client *clp = NULL;
3032         __be32 status = 0;
3033         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3034
3035         spin_lock(&nn->client_lock);
3036         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3037         conf = find_confirmed_client(&dc->clientid, true, nn);
3038         WARN_ON_ONCE(conf && unconf);
3039
3040         if (conf) {
3041                 if (client_has_state(conf)) {
3042                         status = nfserr_clientid_busy;
3043                         goto out;
3044                 }
3045                 status = mark_client_expired_locked(conf);
3046                 if (status)
3047                         goto out;
3048                 clp = conf;
3049         } else if (unconf)
3050                 clp = unconf;
3051         else {
3052                 status = nfserr_stale_clientid;
3053                 goto out;
3054         }
3055         if (!mach_creds_match(clp, rqstp)) {
3056                 clp = NULL;
3057                 status = nfserr_wrong_cred;
3058                 goto out;
3059         }
3060         unhash_client_locked(clp);
3061 out:
3062         spin_unlock(&nn->client_lock);
3063         if (clp)
3064                 expire_client(clp);
3065         return status;
3066 }
3067
3068 __be32
3069 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
3070 {
3071         __be32 status = 0;
3072
3073         if (rc->rca_one_fs) {
3074                 if (!cstate->current_fh.fh_dentry)
3075                         return nfserr_nofilehandle;
3076                 /*
3077                  * We don't take advantage of the rca_one_fs case.
3078                  * That's OK, it's optional, we can safely ignore it.
3079                  */
3080                  return nfs_ok;
3081         }
3082
3083         status = nfserr_complete_already;
3084         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3085                              &cstate->session->se_client->cl_flags))
3086                 goto out;
3087
3088         status = nfserr_stale_clientid;
3089         if (is_client_expired(cstate->session->se_client))
3090                 /*
3091                  * The following error isn't really legal.
3092                  * But we only get here if the client just explicitly
3093                  * destroyed the client.  Surely it no longer cares what
3094                  * error it gets back on an operation for the dead
3095                  * client.
3096                  */
3097                 goto out;
3098
3099         status = nfs_ok;
3100         nfsd4_client_record_create(cstate->session->se_client);
3101 out:
3102         return status;
3103 }
3104
3105 __be32
3106 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3107                   struct nfsd4_setclientid *setclid)
3108 {
3109         struct xdr_netobj       clname = setclid->se_name;
3110         nfs4_verifier           clverifier = setclid->se_verf;
3111         struct nfs4_client      *conf, *new;
3112         struct nfs4_client      *unconf = NULL;
3113         __be32                  status;
3114         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3115
3116         new = create_client(clname, rqstp, &clverifier);
3117         if (new == NULL)
3118                 return nfserr_jukebox;
3119         /* Cases below refer to rfc 3530 section 14.2.33: */
3120         spin_lock(&nn->client_lock);
3121         conf = find_confirmed_client_by_name(&clname, nn);
3122         if (conf && client_has_state(conf)) {
3123                 /* case 0: */
3124                 status = nfserr_clid_inuse;
3125                 if (clp_used_exchangeid(conf))
3126                         goto out;
3127                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3128                         char addr_str[INET6_ADDRSTRLEN];
3129                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3130                                  sizeof(addr_str));
3131                         dprintk("NFSD: setclientid: string in use by client "
3132                                 "at %s\n", addr_str);
3133                         goto out;
3134                 }
3135         }
3136         unconf = find_unconfirmed_client_by_name(&clname, nn);
3137         if (unconf)
3138                 unhash_client_locked(unconf);
3139         if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3140                 /* case 1: probable callback update */
3141                 copy_clid(new, conf);
3142                 gen_confirm(new, nn);
3143         } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3144                 gen_clid(new, nn);
3145         new->cl_minorversion = 0;
3146         gen_callback(new, setclid, rqstp);
3147         add_to_unconfirmed(new);
3148         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3149         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3150         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3151         new = NULL;
3152         status = nfs_ok;
3153 out:
3154         spin_unlock(&nn->client_lock);
3155         if (new)
3156                 free_client(new);
3157         if (unconf)
3158                 expire_client(unconf);
3159         return status;
3160 }
3161
3162
3163 __be32
3164 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3165                          struct nfsd4_compound_state *cstate,
3166                          struct nfsd4_setclientid_confirm *setclientid_confirm)
3167 {
3168         struct nfs4_client *conf, *unconf;
3169         struct nfs4_client *old = NULL;
3170         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3171         clientid_t * clid = &setclientid_confirm->sc_clientid;
3172         __be32 status;
3173         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3174
3175         if (STALE_CLIENTID(clid, nn))
3176                 return nfserr_stale_clientid;
3177
3178         spin_lock(&nn->client_lock);
3179         conf = find_confirmed_client(clid, false, nn);
3180         unconf = find_unconfirmed_client(clid, false, nn);
3181         /*
3182          * We try hard to give out unique clientid's, so if we get an
3183          * attempt to confirm the same clientid with a different cred,
3184          * the client may be buggy; this should never happen.
3185          *
3186          * Nevertheless, RFC 7530 recommends INUSE for this case:
3187          */
3188         status = nfserr_clid_inuse;
3189         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3190                 goto out;
3191         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3192                 goto out;
3193         /* cases below refer to rfc 3530 section 14.2.34: */
3194         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3195                 if (conf && !unconf) /* case 2: probable retransmit */
3196                         status = nfs_ok;
3197                 else /* case 4: client hasn't noticed we rebooted yet? */
3198                         status = nfserr_stale_clientid;
3199                 goto out;
3200         }
3201         status = nfs_ok;
3202         if (conf) { /* case 1: callback update */
3203                 old = unconf;
3204                 unhash_client_locked(old);
3205                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3206         } else { /* case 3: normal case; new or rebooted client */
3207                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3208                 if (old) {
3209                         status = nfserr_clid_inuse;
3210                         if (client_has_state(old)
3211                                         && !same_creds(&unconf->cl_cred,
3212                                                         &old->cl_cred))
3213                                 goto out;
3214                         status = mark_client_expired_locked(old);
3215                         if (status) {
3216                                 old = NULL;
3217                                 goto out;
3218                         }
3219                 }
3220                 move_to_confirmed(unconf);
3221                 conf = unconf;
3222         }
3223         get_client_locked(conf);
3224         spin_unlock(&nn->client_lock);
3225         nfsd4_probe_callback(conf);
3226         spin_lock(&nn->client_lock);
3227         put_client_renew_locked(conf);
3228 out:
3229         spin_unlock(&nn->client_lock);
3230         if (old)
3231                 expire_client(old);
3232         return status;
3233 }
3234
3235 static struct nfs4_file *nfsd4_alloc_file(void)
3236 {
3237         return kmem_cache_alloc(file_slab, GFP_KERNEL);
3238 }
3239
3240 /* OPEN Share state helper functions */
3241 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3242                                 struct nfs4_file *fp)
3243 {
3244         lockdep_assert_held(&state_lock);
3245
3246         atomic_set(&fp->fi_ref, 1);
3247         spin_lock_init(&fp->fi_lock);
3248         INIT_LIST_HEAD(&fp->fi_stateids);
3249         INIT_LIST_HEAD(&fp->fi_delegations);
3250         INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3251         fh_copy_shallow(&fp->fi_fhandle, fh);
3252         fp->fi_deleg_file = NULL;
3253         fp->fi_had_conflict = false;
3254         fp->fi_share_deny = 0;
3255         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3256         memset(fp->fi_access, 0, sizeof(fp->fi_access));
3257 #ifdef CONFIG_NFSD_PNFS
3258         INIT_LIST_HEAD(&fp->fi_lo_states);
3259         atomic_set(&fp->fi_lo_recalls, 0);
3260 #endif
3261         hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3262 }
3263
3264 void
3265 nfsd4_free_slabs(void)
3266 {
3267         kmem_cache_destroy(odstate_slab);
3268         kmem_cache_destroy(openowner_slab);
3269         kmem_cache_destroy(lockowner_slab);
3270         kmem_cache_destroy(file_slab);
3271         kmem_cache_destroy(stateid_slab);
3272         kmem_cache_destroy(deleg_slab);
3273 }
3274
3275 int
3276 nfsd4_init_slabs(void)
3277 {
3278         openowner_slab = kmem_cache_create("nfsd4_openowners",
3279                         sizeof(struct nfs4_openowner), 0, 0, NULL);
3280         if (openowner_slab == NULL)
3281                 goto out;
3282         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3283                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
3284         if (lockowner_slab == NULL)
3285                 goto out_free_openowner_slab;
3286         file_slab = kmem_cache_create("nfsd4_files",
3287                         sizeof(struct nfs4_file), 0, 0, NULL);
3288         if (file_slab == NULL)
3289                 goto out_free_lockowner_slab;
3290         stateid_slab = kmem_cache_create("nfsd4_stateids",
3291                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3292         if (stateid_slab == NULL)
3293                 goto out_free_file_slab;
3294         deleg_slab = kmem_cache_create("nfsd4_delegations",
3295                         sizeof(struct nfs4_delegation), 0, 0, NULL);
3296         if (deleg_slab == NULL)
3297                 goto out_free_stateid_slab;
3298         odstate_slab = kmem_cache_create("nfsd4_odstate",
3299                         sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3300         if (odstate_slab == NULL)
3301                 goto out_free_deleg_slab;
3302         return 0;
3303
3304 out_free_deleg_slab:
3305         kmem_cache_destroy(deleg_slab);
3306 out_free_stateid_slab:
3307         kmem_cache_destroy(stateid_slab);
3308 out_free_file_slab:
3309         kmem_cache_destroy(file_slab);
3310 out_free_lockowner_slab:
3311         kmem_cache_destroy(lockowner_slab);
3312 out_free_openowner_slab:
3313         kmem_cache_destroy(openowner_slab);
3314 out:
3315         dprintk("nfsd4: out of memory while initializing nfsv4\n");
3316         return -ENOMEM;
3317 }
3318
3319 static void init_nfs4_replay(struct nfs4_replay *rp)
3320 {
3321         rp->rp_status = nfserr_serverfault;
3322         rp->rp_buflen = 0;
3323         rp->rp_buf = rp->rp_ibuf;
3324         mutex_init(&rp->rp_mutex);
3325 }
3326
3327 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3328                 struct nfs4_stateowner *so)
3329 {
3330         if (!nfsd4_has_session(cstate)) {
3331                 mutex_lock(&so->so_replay.rp_mutex);
3332                 cstate->replay_owner = nfs4_get_stateowner(so);
3333         }
3334 }
3335
3336 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3337 {
3338         struct nfs4_stateowner *so = cstate->replay_owner;
3339
3340         if (so != NULL) {
3341                 cstate->replay_owner = NULL;
3342                 mutex_unlock(&so->so_replay.rp_mutex);
3343                 nfs4_put_stateowner(so);
3344         }
3345 }
3346
3347 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3348 {
3349         struct nfs4_stateowner *sop;
3350
3351         sop = kmem_cache_alloc(slab, GFP_KERNEL);
3352         if (!sop)
3353                 return NULL;
3354
3355         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3356         if (!sop->so_owner.data) {
3357                 kmem_cache_free(slab, sop);
3358                 return NULL;
3359         }
3360         sop->so_owner.len = owner->len;
3361
3362         INIT_LIST_HEAD(&sop->so_stateids);
3363         sop->so_client = clp;
3364         init_nfs4_replay(&sop->so_replay);
3365         atomic_set(&sop->so_count, 1);
3366         return sop;
3367 }
3368
3369 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3370 {
3371         lockdep_assert_held(&clp->cl_lock);
3372
3373         list_add(&oo->oo_owner.so_strhash,
3374                  &clp->cl_ownerstr_hashtbl[strhashval]);
3375         list_add(&oo->oo_perclient, &clp->cl_openowners);
3376 }
3377
3378 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3379 {
3380         unhash_openowner_locked(openowner(so));
3381 }
3382
3383 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3384 {
3385         struct nfs4_openowner *oo = openowner(so);
3386
3387         kmem_cache_free(openowner_slab, oo);
3388 }
3389
3390 static const struct nfs4_stateowner_operations openowner_ops = {
3391         .so_unhash =    nfs4_unhash_openowner,
3392         .so_free =      nfs4_free_openowner,
3393 };
3394
3395 static struct nfs4_ol_stateid *
3396 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3397 {
3398         struct nfs4_ol_stateid *local, *ret = NULL;
3399         struct nfs4_openowner *oo = open->op_openowner;
3400
3401         lockdep_assert_held(&fp->fi_lock);
3402
3403         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3404                 /* ignore lock owners */
3405                 if (local->st_stateowner->so_is_open_owner == 0)
3406                         continue;
3407                 if (local->st_stateowner == &oo->oo_owner) {
3408                         ret = local;
3409                         atomic_inc(&ret->st_stid.sc_count);
3410                         break;
3411                 }
3412         }
3413         return ret;
3414 }
3415
3416 static struct nfs4_openowner *
3417 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3418                            struct nfsd4_compound_state *cstate)
3419 {
3420         struct nfs4_client *clp = cstate->clp;
3421         struct nfs4_openowner *oo, *ret;
3422
3423         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3424         if (!oo)
3425                 return NULL;
3426         oo->oo_owner.so_ops = &openowner_ops;
3427         oo->oo_owner.so_is_open_owner = 1;
3428         oo->oo_owner.so_seqid = open->op_seqid;
3429         oo->oo_flags = 0;
3430         if (nfsd4_has_session(cstate))
3431                 oo->oo_flags |= NFS4_OO_CONFIRMED;
3432         oo->oo_time = 0;
3433         oo->oo_last_closed_stid = NULL;
3434         INIT_LIST_HEAD(&oo->oo_close_lru);
3435         spin_lock(&clp->cl_lock);
3436         ret = find_openstateowner_str_locked(strhashval, open, clp);
3437         if (ret == NULL) {
3438                 hash_openowner(oo, clp, strhashval);
3439                 ret = oo;
3440         } else
3441                 nfs4_free_stateowner(&oo->oo_owner);
3442
3443         spin_unlock(&clp->cl_lock);
3444         return ret;
3445 }
3446
3447 static struct nfs4_ol_stateid *
3448 init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
3449                 struct nfsd4_open *open)
3450 {
3451
3452         struct nfs4_openowner *oo = open->op_openowner;
3453         struct nfs4_ol_stateid *retstp = NULL;
3454
3455         spin_lock(&oo->oo_owner.so_client->cl_lock);
3456         spin_lock(&fp->fi_lock);
3457
3458         retstp = nfsd4_find_existing_open(fp, open);
3459         if (retstp)
3460                 goto out_unlock;
3461         atomic_inc(&stp->st_stid.sc_count);
3462         stp->st_stid.sc_type = NFS4_OPEN_STID;
3463         INIT_LIST_HEAD(&stp->st_locks);
3464         stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
3465         get_nfs4_file(fp);
3466         stp->st_stid.sc_file = fp;
3467         stp->st_access_bmap = 0;
3468         stp->st_deny_bmap = 0;
3469         stp->st_openstp = NULL;
3470         init_rwsem(&stp->st_rwsem);
3471         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3472         list_add(&stp->st_perfile, &fp->fi_stateids);
3473
3474 out_unlock:
3475         spin_unlock(&fp->fi_lock);
3476         spin_unlock(&oo->oo_owner.so_client->cl_lock);
3477         return retstp;
3478 }
3479
3480 /*
3481  * In the 4.0 case we need to keep the owners around a little while to handle
3482  * CLOSE replay. We still do need to release any file access that is held by
3483  * them before returning however.
3484  */
3485 static void
3486 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3487 {
3488         struct nfs4_ol_stateid *last;
3489         struct nfs4_openowner *oo = openowner(s->st_stateowner);
3490         struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3491                                                 nfsd_net_id);
3492
3493         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3494
3495         /*
3496          * We know that we hold one reference via nfsd4_close, and another
3497          * "persistent" reference for the client. If the refcount is higher
3498          * than 2, then there are still calls in progress that are using this
3499          * stateid. We can't put the sc_file reference until they are finished.
3500          * Wait for the refcount to drop to 2. Since it has been unhashed,
3501          * there should be no danger of the refcount going back up again at
3502          * this point.
3503          */
3504         wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2);
3505
3506         release_all_access(s);
3507         if (s->st_stid.sc_file) {
3508                 put_nfs4_file(s->st_stid.sc_file);
3509                 s->st_stid.sc_file = NULL;
3510         }
3511
3512         spin_lock(&nn->client_lock);
3513         last = oo->oo_last_closed_stid;
3514         oo->oo_last_closed_stid = s;
3515         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3516         oo->oo_time = get_seconds();
3517         spin_unlock(&nn->client_lock);
3518         if (last)
3519                 nfs4_put_stid(&last->st_stid);
3520 }
3521
3522 /* search file_hashtbl[] for file */
3523 static struct nfs4_file *
3524 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
3525 {
3526         struct nfs4_file *fp;
3527
3528         hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
3529                 if (fh_match(&fp->fi_fhandle, fh)) {
3530                         if (atomic_inc_not_zero(&fp->fi_ref))
3531                                 return fp;
3532                 }
3533         }
3534         return NULL;
3535 }
3536
3537 struct nfs4_file *
3538 find_file(struct knfsd_fh *fh)
3539 {
3540         struct nfs4_file *fp;
3541         unsigned int hashval = file_hashval(fh);
3542
3543         rcu_read_lock();
3544         fp = find_file_locked(fh, hashval);
3545         rcu_read_unlock();
3546         return fp;
3547 }
3548
3549 static struct nfs4_file *
3550 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3551 {
3552         struct nfs4_file *fp;
3553         unsigned int hashval = file_hashval(fh);
3554
3555         rcu_read_lock();
3556         fp = find_file_locked(fh, hashval);
3557         rcu_read_unlock();
3558         if (fp)
3559                 return fp;
3560
3561         spin_lock(&state_lock);
3562         fp = find_file_locked(fh, hashval);
3563         if (likely(fp == NULL)) {
3564                 nfsd4_init_file(fh, hashval, new);
3565                 fp = new;
3566         }
3567         spin_unlock(&state_lock);
3568
3569         return fp;
3570 }
3571
3572 /*
3573  * Called to check deny when READ with all zero stateid or
3574  * WRITE with all zero or all one stateid
3575  */
3576 static __be32
3577 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3578 {
3579         struct nfs4_file *fp;
3580         __be32 ret = nfs_ok;
3581
3582         fp = find_file(&current_fh->fh_handle);
3583         if (!fp)
3584                 return ret;
3585         /* Check for conflicting share reservations */
3586         spin_lock(&fp->fi_lock);
3587         if (fp->fi_share_deny & deny_type)
3588                 ret = nfserr_locked;
3589         spin_unlock(&fp->fi_lock);
3590         put_nfs4_file(fp);
3591         return ret;
3592 }
3593
3594 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
3595 {
3596         struct nfs4_delegation *dp = cb_to_delegation(cb);
3597         struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3598                                           nfsd_net_id);
3599
3600         block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3601
3602         /*
3603          * We can't do this in nfsd_break_deleg_cb because it is
3604          * already holding inode->i_lock.
3605          *
3606          * If the dl_time != 0, then we know that it has already been
3607          * queued for a lease break. Don't queue it again.
3608          */
3609         spin_lock(&state_lock);
3610         if (dp->dl_time == 0) {
3611                 dp->dl_time = get_seconds();
3612                 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3613         }
3614         spin_unlock(&state_lock);
3615 }
3616
3617 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
3618                 struct rpc_task *task)
3619 {
3620         struct nfs4_delegation *dp = cb_to_delegation(cb);
3621
3622         if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
3623                 return 1;
3624
3625         switch (task->tk_status) {
3626         case 0:
3627                 return 1;
3628         case -EBADHANDLE:
3629         case -NFS4ERR_BAD_STATEID:
3630                 /*
3631                  * Race: client probably got cb_recall before open reply
3632                  * granting delegation.
3633                  */
3634                 if (dp->dl_retries--) {
3635                         rpc_delay(task, 2 * HZ);
3636                         return 0;
3637                 }
3638                 /*FALLTHRU*/
3639         default:
3640                 return -1;
3641         }
3642 }
3643
3644 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
3645 {
3646         struct nfs4_delegation *dp = cb_to_delegation(cb);
3647
3648         nfs4_put_stid(&dp->dl_stid);
3649 }
3650
3651 static struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
3652         .prepare        = nfsd4_cb_recall_prepare,
3653         .done           = nfsd4_cb_recall_done,
3654         .release        = nfsd4_cb_recall_release,
3655 };
3656
3657 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3658 {
3659         /*
3660          * We're assuming the state code never drops its reference
3661          * without first removing the lease.  Since we're in this lease
3662          * callback (and since the lease code is serialized by the kernel
3663          * lock) we know the server hasn't removed the lease yet, we know
3664          * it's safe to take a reference.
3665          */
3666         atomic_inc(&dp->dl_stid.sc_count);
3667         nfsd4_run_cb(&dp->dl_recall);
3668 }
3669
3670 /* Called from break_lease() with i_lock held. */
3671 static bool
3672 nfsd_break_deleg_cb(struct file_lock *fl)
3673 {
3674         bool ret = false;
3675         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
3676         struct nfs4_delegation *dp;
3677
3678         if (!fp) {
3679                 WARN(1, "(%p)->fl_owner NULL\n", fl);
3680                 return ret;
3681         }
3682         if (fp->fi_had_conflict) {
3683                 WARN(1, "duplicate break on %p\n", fp);
3684                 return ret;
3685         }
3686         /*
3687          * We don't want the locks code to timeout the lease for us;
3688          * we'll remove it ourself if a delegation isn't returned
3689          * in time:
3690          */
3691         fl->fl_break_time = 0;
3692
3693         spin_lock(&fp->fi_lock);
3694         fp->fi_had_conflict = true;
3695         /*
3696          * If there are no delegations on the list, then return true
3697          * so that the lease code will go ahead and delete it.
3698          */
3699         if (list_empty(&fp->fi_delegations))
3700                 ret = true;
3701         else
3702                 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
3703                         nfsd_break_one_deleg(dp);
3704         spin_unlock(&fp->fi_lock);
3705         return ret;
3706 }
3707
3708 static int
3709 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
3710                      struct list_head *dispose)
3711 {
3712         if (arg & F_UNLCK)
3713                 return lease_modify(onlist, arg, dispose);
3714         else
3715                 return -EAGAIN;
3716 }
3717
3718 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3719         .lm_break = nfsd_break_deleg_cb,
3720         .lm_change = nfsd_change_deleg_cb,
3721 };
3722
3723 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3724 {
3725         if (nfsd4_has_session(cstate))
3726                 return nfs_ok;
3727         if (seqid == so->so_seqid - 1)
3728                 return nfserr_replay_me;
3729         if (seqid == so->so_seqid)
3730                 return nfs_ok;
3731         return nfserr_bad_seqid;
3732 }
3733
3734 static __be32 lookup_clientid(clientid_t *clid,
3735                 struct nfsd4_compound_state *cstate,
3736                 struct nfsd_net *nn)
3737 {
3738         struct nfs4_client *found;
3739
3740         if (cstate->clp) {
3741                 found = cstate->clp;
3742                 if (!same_clid(&found->cl_clientid, clid))
3743                         return nfserr_stale_clientid;
3744                 return nfs_ok;
3745         }
3746
3747         if (STALE_CLIENTID(clid, nn))
3748                 return nfserr_stale_clientid;
3749
3750         /*
3751          * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
3752          * cached already then we know this is for is for v4.0 and "sessions"
3753          * will be false.
3754          */
3755         WARN_ON_ONCE(cstate->session);
3756         spin_lock(&nn->client_lock);
3757         found = find_confirmed_client(clid, false, nn);
3758         if (!found) {
3759                 spin_unlock(&nn->client_lock);
3760                 return nfserr_expired;
3761         }
3762         atomic_inc(&found->cl_refcount);
3763         spin_unlock(&nn->client_lock);
3764
3765         /* Cache the nfs4_client in cstate! */
3766         cstate->clp = found;
3767         return nfs_ok;
3768 }
3769
3770 __be32
3771 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
3772                     struct nfsd4_open *open, struct nfsd_net *nn)
3773 {
3774         clientid_t *clientid = &open->op_clientid;
3775         struct nfs4_client *clp = NULL;
3776         unsigned int strhashval;
3777         struct nfs4_openowner *oo = NULL;
3778         __be32 status;
3779
3780         if (STALE_CLIENTID(&open->op_clientid, nn))
3781                 return nfserr_stale_clientid;
3782         /*
3783          * In case we need it later, after we've already created the
3784          * file and don't want to risk a further failure:
3785          */
3786         open->op_file = nfsd4_alloc_file();
3787         if (open->op_file == NULL)
3788                 return nfserr_jukebox;
3789
3790         status = lookup_clientid(clientid, cstate, nn);
3791         if (status)
3792                 return status;
3793         clp = cstate->clp;
3794
3795         strhashval = ownerstr_hashval(&open->op_owner);
3796         oo = find_openstateowner_str(strhashval, open, clp);
3797         open->op_openowner = oo;
3798         if (!oo) {
3799                 goto new_owner;
3800         }
3801         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
3802                 /* Replace unconfirmed owners without checking for replay. */
3803                 release_openowner(oo);
3804                 open->op_openowner = NULL;
3805                 goto new_owner;
3806         }
3807         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
3808         if (status)
3809                 return status;
3810         goto alloc_stateid;
3811 new_owner:
3812         oo = alloc_init_open_stateowner(strhashval, open, cstate);
3813         if (oo == NULL)
3814                 return nfserr_jukebox;
3815         open->op_openowner = oo;
3816 alloc_stateid:
3817         open->op_stp = nfs4_alloc_open_stateid(clp);
3818         if (!open->op_stp)
3819                 return nfserr_jukebox;
3820
3821         if (nfsd4_has_session(cstate) &&
3822             (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
3823                 open->op_odstate = alloc_clnt_odstate(clp);
3824                 if (!open->op_odstate)
3825                         return nfserr_jukebox;
3826         }
3827
3828         return nfs_ok;
3829 }
3830
3831 static inline __be32
3832 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
3833 {
3834         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
3835                 return nfserr_openmode;
3836         else
3837                 return nfs_ok;
3838 }
3839
3840 static int share_access_to_flags(u32 share_access)
3841 {
3842         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
3843 }
3844
3845 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
3846 {
3847         struct nfs4_stid *ret;
3848
3849         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
3850         if (!ret)
3851                 return NULL;
3852         return delegstateid(ret);
3853 }
3854
3855 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
3856 {
3857         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
3858                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
3859 }
3860
3861 static __be32
3862 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
3863                 struct nfs4_delegation **dp)
3864 {
3865         int flags;
3866         __be32 status = nfserr_bad_stateid;
3867         struct nfs4_delegation *deleg;
3868
3869         deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
3870         if (deleg == NULL)
3871                 goto out;
3872         flags = share_access_to_flags(open->op_share_access);
3873         status = nfs4_check_delegmode(deleg, flags);
3874         if (status) {
3875                 nfs4_put_stid(&deleg->dl_stid);
3876                 goto out;
3877         }
3878         *dp = deleg;
3879 out:
3880         if (!nfsd4_is_deleg_cur(open))
3881                 return nfs_ok;
3882         if (status)
3883                 return status;
3884         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3885         return nfs_ok;
3886 }
3887
3888 static inline int nfs4_access_to_access(u32 nfs4_access)
3889 {
3890         int flags = 0;
3891
3892         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
3893                 flags |= NFSD_MAY_READ;
3894         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
3895                 flags |= NFSD_MAY_WRITE;
3896         return flags;
3897 }
3898
3899 static inline __be32
3900 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
3901                 struct nfsd4_open *open)
3902 {
3903         struct iattr iattr = {
3904                 .ia_valid = ATTR_SIZE,
3905                 .ia_size = 0,
3906         };
3907         if (!open->op_truncate)
3908                 return 0;
3909         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
3910                 return nfserr_inval;
3911         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
3912 }
3913
3914 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
3915                 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
3916                 struct nfsd4_open *open)
3917 {
3918         struct file *filp = NULL;
3919         __be32 status;
3920         int oflag = nfs4_access_to_omode(open->op_share_access);
3921         int access = nfs4_access_to_access(open->op_share_access);
3922         unsigned char old_access_bmap, old_deny_bmap;
3923
3924         spin_lock(&fp->fi_lock);
3925
3926         /*
3927          * Are we trying to set a deny mode that would conflict with
3928          * current access?
3929          */
3930         status = nfs4_file_check_deny(fp, open->op_share_deny);
3931         if (status != nfs_ok) {
3932                 spin_unlock(&fp->fi_lock);
3933                 goto out;
3934         }
3935
3936         /* set access to the file */
3937         status = nfs4_file_get_access(fp, open->op_share_access);
3938         if (status != nfs_ok) {
3939                 spin_unlock(&fp->fi_lock);
3940                 goto out;
3941         }
3942
3943         /* Set access bits in stateid */
3944         old_access_bmap = stp->st_access_bmap;
3945         set_access(open->op_share_access, stp);
3946
3947         /* Set new deny mask */
3948         old_deny_bmap = stp->st_deny_bmap;
3949         set_deny(open->op_share_deny, stp);
3950         fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
3951
3952         if (!fp->fi_fds[oflag]) {
3953                 spin_unlock(&fp->fi_lock);
3954                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
3955                 if (status)
3956                         goto out_put_access;
3957                 spin_lock(&fp->fi_lock);
3958                 if (!fp->fi_fds[oflag]) {
3959                         fp->fi_fds[oflag] = filp;
3960                         filp = NULL;
3961                 }
3962         }
3963         spin_unlock(&fp->fi_lock);
3964         if (filp)
3965                 fput(filp);
3966
3967         status = nfsd4_truncate(rqstp, cur_fh, open);
3968         if (status)
3969                 goto out_put_access;
3970 out:
3971         return status;
3972 out_put_access:
3973         stp->st_access_bmap = old_access_bmap;
3974         nfs4_file_put_access(fp, open->op_share_access);
3975         reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
3976         goto out;
3977 }
3978
3979 static __be32
3980 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)
3981 {
3982         __be32 status;
3983         unsigned char old_deny_bmap = stp->st_deny_bmap;
3984
3985         if (!test_access(open->op_share_access, stp))
3986                 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
3987
3988         /* test and set deny mode */
3989         spin_lock(&fp->fi_lock);
3990         status = nfs4_file_check_deny(fp, open->op_share_deny);
3991         if (status == nfs_ok) {
3992                 set_deny(open->op_share_deny, stp);
3993                 fp->fi_share_deny |=
3994                                 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
3995         }
3996         spin_unlock(&fp->fi_lock);
3997
3998         if (status != nfs_ok)
3999                 return status;
4000
4001         status = nfsd4_truncate(rqstp, cur_fh, open);
4002         if (status != nfs_ok)
4003                 reset_union_bmap_deny(old_deny_bmap, stp);
4004         return status;
4005 }
4006
4007 /* Should we give out recallable state?: */
4008 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4009 {
4010         if (clp->cl_cb_state == NFSD4_CB_UP)
4011                 return true;
4012         /*
4013          * In the sessions case, since we don't have to establish a
4014          * separate connection for callbacks, we assume it's OK
4015          * until we hear otherwise:
4016          */
4017         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4018 }
4019
4020 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
4021 {
4022         struct file_lock *fl;
4023
4024         fl = locks_alloc_lock();
4025         if (!fl)
4026                 return NULL;
4027         fl->fl_lmops = &nfsd_lease_mng_ops;
4028         fl->fl_flags = FL_DELEG;
4029         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4030         fl->fl_end = OFFSET_MAX;
4031         fl->fl_owner = (fl_owner_t)fp;
4032         fl->fl_pid = current->tgid;
4033         return fl;
4034 }
4035
4036 /**
4037  * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
4038  * @dp:   a pointer to the nfs4_delegation we're adding.
4039  *
4040  * Return:
4041  *      On success: Return code will be 0 on success.
4042  *
4043  *      On error: -EAGAIN if there was an existing delegation.
4044  *                 nonzero if there is an error in other cases.
4045  *
4046  */
4047
4048 static int nfs4_setlease(struct nfs4_delegation *dp)
4049 {
4050         struct nfs4_file *fp = dp->dl_stid.sc_file;
4051         struct file_lock *fl;
4052         struct file *filp;
4053         int status = 0;
4054
4055         fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
4056         if (!fl)
4057                 return -ENOMEM;
4058         filp = find_readable_file(fp);
4059         if (!filp) {
4060                 /* We should always have a readable file here */
4061                 WARN_ON_ONCE(1);
4062                 locks_free_lock(fl);
4063                 return -EBADF;
4064         }
4065         fl->fl_file = filp;
4066         status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
4067         if (fl)
4068                 locks_free_lock(fl);
4069         if (status)
4070                 goto out_fput;
4071         spin_lock(&state_lock);
4072         spin_lock(&fp->fi_lock);
4073         /* Did the lease get broken before we took the lock? */
4074         status = -EAGAIN;
4075         if (fp->fi_had_conflict)
4076                 goto out_unlock;
4077         /* Race breaker */
4078         if (fp->fi_deleg_file) {
4079                 status = hash_delegation_locked(dp, fp);
4080                 goto out_unlock;
4081         }
4082         fp->fi_deleg_file = filp;
4083         fp->fi_delegees = 0;
4084         status = hash_delegation_locked(dp, fp);
4085         spin_unlock(&fp->fi_lock);
4086         spin_unlock(&state_lock);
4087         if (status) {
4088                 /* Should never happen, this is a new fi_deleg_file  */
4089                 WARN_ON_ONCE(1);
4090                 goto out_fput;
4091         }
4092         return 0;
4093 out_unlock:
4094         spin_unlock(&fp->fi_lock);
4095         spin_unlock(&state_lock);
4096 out_fput:
4097         fput(filp);
4098         return status;
4099 }
4100
4101 static struct nfs4_delegation *
4102 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4103                     struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4104 {
4105         int status;
4106         struct nfs4_delegation *dp;
4107
4108         if (fp->fi_had_conflict)
4109                 return ERR_PTR(-EAGAIN);
4110
4111         spin_lock(&state_lock);
4112         spin_lock(&fp->fi_lock);
4113         status = nfs4_get_existing_delegation(clp, fp);
4114         spin_unlock(&fp->fi_lock);
4115         spin_unlock(&state_lock);
4116
4117         if (status)
4118                 return ERR_PTR(status);
4119
4120         dp = alloc_init_deleg(clp, fh, odstate);
4121         if (!dp)
4122                 return ERR_PTR(-ENOMEM);
4123
4124         get_nfs4_file(fp);
4125         spin_lock(&state_lock);
4126         spin_lock(&fp->fi_lock);
4127         dp->dl_stid.sc_file = fp;
4128         if (!fp->fi_deleg_file) {
4129                 spin_unlock(&fp->fi_lock);
4130                 spin_unlock(&state_lock);
4131                 status = nfs4_setlease(dp);
4132                 goto out;
4133         }
4134         if (fp->fi_had_conflict) {
4135                 status = -EAGAIN;
4136                 goto out_unlock;
4137         }
4138         status = hash_delegation_locked(dp, fp);
4139 out_unlock:
4140         spin_unlock(&fp->fi_lock);
4141         spin_unlock(&state_lock);
4142 out:
4143         if (status) {
4144                 put_clnt_odstate(dp->dl_clnt_odstate);
4145                 nfs4_put_stid(&dp->dl_stid);
4146                 return ERR_PTR(status);
4147         }
4148         return dp;
4149 }
4150
4151 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4152 {
4153         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4154         if (status == -EAGAIN)
4155                 open->op_why_no_deleg = WND4_CONTENTION;
4156         else {
4157                 open->op_why_no_deleg = WND4_RESOURCE;
4158                 switch (open->op_deleg_want) {
4159                 case NFS4_SHARE_WANT_READ_DELEG:
4160                 case NFS4_SHARE_WANT_WRITE_DELEG:
4161                 case NFS4_SHARE_WANT_ANY_DELEG:
4162                         break;
4163                 case NFS4_SHARE_WANT_CANCEL:
4164                         open->op_why_no_deleg = WND4_CANCELLED;
4165                         break;
4166                 case NFS4_SHARE_WANT_NO_DELEG:
4167                         WARN_ON_ONCE(1);
4168                 }
4169         }
4170 }
4171
4172 /*
4173  * Attempt to hand out a delegation.
4174  *
4175  * Note we don't support write delegations, and won't until the vfs has
4176  * proper support for them.
4177  */
4178 static void
4179 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4180                         struct nfs4_ol_stateid *stp)
4181 {
4182         struct nfs4_delegation *dp;
4183         struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4184         struct nfs4_client *clp = stp->st_stid.sc_client;
4185         int cb_up;
4186         int status = 0;
4187
4188         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4189         open->op_recall = 0;
4190         switch (open->op_claim_type) {
4191                 case NFS4_OPEN_CLAIM_PREVIOUS:
4192                         if (!cb_up)
4193                                 open->op_recall = 1;
4194                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4195                                 goto out_no_deleg;
4196                         break;
4197                 case NFS4_OPEN_CLAIM_NULL:
4198                 case NFS4_OPEN_CLAIM_FH:
4199                         /*
4200                          * Let's not give out any delegations till everyone's
4201                          * had the chance to reclaim theirs, *and* until
4202                          * NLM locks have all been reclaimed:
4203                          */
4204                         if (locks_in_grace(clp->net))
4205                                 goto out_no_deleg;
4206                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4207                                 goto out_no_deleg;
4208                         /*
4209                          * Also, if the file was opened for write or
4210                          * create, there's a good chance the client's
4211                          * about to write to it, resulting in an
4212                          * immediate recall (since we don't support
4213                          * write delegations):
4214                          */
4215                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4216                                 goto out_no_deleg;
4217                         if (open->op_create == NFS4_OPEN_CREATE)
4218                                 goto out_no_deleg;
4219                         break;
4220                 default:
4221                         goto out_no_deleg;
4222         }
4223         dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4224         if (IS_ERR(dp))
4225                 goto out_no_deleg;
4226
4227         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4228
4229         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4230                 STATEID_VAL(&dp->dl_stid.sc_stateid));
4231         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4232         nfs4_put_stid(&dp->dl_stid);
4233         return;
4234 out_no_deleg:
4235         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4236         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4237             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4238                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4239                 open->op_recall = 1;
4240         }
4241
4242         /* 4.1 client asking for a delegation? */
4243         if (open->op_deleg_want)
4244                 nfsd4_open_deleg_none_ext(open, status);
4245         return;
4246 }
4247
4248 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4249                                         struct nfs4_delegation *dp)
4250 {
4251         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4252             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4253                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4254                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4255         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4256                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4257                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4258                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4259         }
4260         /* Otherwise the client must be confused wanting a delegation
4261          * it already has, therefore we don't return
4262          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4263          */
4264 }
4265
4266 __be32
4267 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4268 {
4269         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4270         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4271         struct nfs4_file *fp = NULL;
4272         struct nfs4_ol_stateid *stp = NULL;
4273         struct nfs4_ol_stateid *swapstp = NULL;
4274         struct nfs4_delegation *dp = NULL;
4275         __be32 status;
4276
4277         /*
4278          * Lookup file; if found, lookup stateid and check open request,
4279          * and check for delegations in the process of being recalled.
4280          * If not found, create the nfs4_file struct
4281          */
4282         fp = find_or_add_file(open->op_file, &current_fh->fh_handle);
4283         if (fp != open->op_file) {
4284                 status = nfs4_check_deleg(cl, open, &dp);
4285                 if (status)
4286                         goto out;
4287                 spin_lock(&fp->fi_lock);
4288                 stp = nfsd4_find_existing_open(fp, open);
4289                 spin_unlock(&fp->fi_lock);
4290         } else {
4291                 open->op_file = NULL;
4292                 status = nfserr_bad_stateid;
4293                 if (nfsd4_is_deleg_cur(open))
4294                         goto out;
4295         }
4296
4297         /*
4298          * OPEN the file, or upgrade an existing OPEN.
4299          * If truncate fails, the OPEN fails.
4300          */
4301         if (stp) {
4302                 /* Stateid was found, this is an OPEN upgrade */
4303                 down_read(&stp->st_rwsem);
4304                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4305                 if (status) {
4306                         up_read(&stp->st_rwsem);
4307                         goto out;
4308                 }
4309         } else {
4310                 stp = open->op_stp;
4311                 open->op_stp = NULL;
4312                 swapstp = init_open_stateid(stp, fp, open);
4313                 if (swapstp) {
4314                         nfs4_put_stid(&stp->st_stid);
4315                         stp = swapstp;
4316                         down_read(&stp->st_rwsem);
4317                         status = nfs4_upgrade_open(rqstp, fp, current_fh,
4318                                                 stp, open);
4319                         if (status) {
4320                                 up_read(&stp->st_rwsem);
4321                                 goto out;
4322                         }
4323                         goto upgrade_out;
4324                 }
4325                 down_read(&stp->st_rwsem);
4326                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4327                 if (status) {
4328                         up_read(&stp->st_rwsem);
4329                         release_open_stateid(stp);
4330                         goto out;
4331                 }
4332
4333                 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
4334                                                         open->op_odstate);
4335                 if (stp->st_clnt_odstate == open->op_odstate)
4336                         open->op_odstate = NULL;
4337         }
4338 upgrade_out:
4339         nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
4340         up_read(&stp->st_rwsem);
4341
4342         if (nfsd4_has_session(&resp->cstate)) {
4343                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4344                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4345                         open->op_why_no_deleg = WND4_NOT_WANTED;
4346                         goto nodeleg;
4347                 }
4348         }
4349
4350         /*
4351         * Attempt to hand out a delegation. No error return, because the
4352         * OPEN succeeds even if we fail.
4353         */
4354         nfs4_open_delegation(current_fh, open, stp);
4355 nodeleg:
4356         status = nfs_ok;
4357
4358         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4359                 STATEID_VAL(&stp->st_stid.sc_stateid));
4360 out:
4361         /* 4.1 client trying to upgrade/downgrade delegation? */
4362         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4363             open->op_deleg_want)
4364                 nfsd4_deleg_xgrade_none_ext(open, dp);
4365
4366         if (fp)
4367                 put_nfs4_file(fp);
4368         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4369                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4370         /*
4371         * To finish the open response, we just need to set the rflags.
4372         */
4373         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4374         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
4375             !nfsd4_has_session(&resp->cstate))
4376                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4377         if (dp)
4378                 nfs4_put_stid(&dp->dl_stid);
4379         if (stp)
4380                 nfs4_put_stid(&stp->st_stid);
4381
4382         return status;
4383 }
4384
4385 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4386                               struct nfsd4_open *open)
4387 {
4388         if (open->op_openowner) {
4389                 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4390
4391                 nfsd4_cstate_assign_replay(cstate, so);
4392                 nfs4_put_stateowner(so);
4393         }
4394         if (open->op_file)
4395                 kmem_cache_free(file_slab, open->op_file);
4396         if (open->op_stp)
4397                 nfs4_put_stid(&open->op_stp->st_stid);
4398         if (open->op_odstate)
4399                 kmem_cache_free(odstate_slab, open->op_odstate);
4400 }
4401
4402 __be32
4403 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4404             clientid_t *clid)
4405 {
4406         struct nfs4_client *clp;
4407         __be32 status;
4408         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4409
4410         dprintk("process_renew(%08x/%08x): starting\n",
4411                         clid->cl_boot, clid->cl_id);
4412         status = lookup_clientid(clid, cstate, nn);
4413         if (status)
4414                 goto out;
4415         clp = cstate->clp;
4416         status = nfserr_cb_path_down;
4417         if (!list_empty(&clp->cl_delegations)
4418                         && clp->cl_cb_state != NFSD4_CB_UP)
4419                 goto out;
4420         status = nfs_ok;
4421 out:
4422         return status;
4423 }
4424
4425 void
4426 nfsd4_end_grace(struct nfsd_net *nn)
4427 {
4428         /* do nothing if grace period already ended */
4429         if (nn->grace_ended)
4430                 return;
4431
4432         dprintk("NFSD: end of grace period\n");
4433         nn->grace_ended = true;
4434         /*
4435          * If the server goes down again right now, an NFSv4
4436          * client will still be allowed to reclaim after it comes back up,
4437          * even if it hasn't yet had a chance to reclaim state this time.
4438          *
4439          */
4440         nfsd4_record_grace_done(nn);
4441         /*
4442          * At this point, NFSv4 clients can still reclaim.  But if the
4443          * server crashes, any that have not yet reclaimed will be out
4444          * of luck on the next boot.
4445          *
4446          * (NFSv4.1+ clients are considered to have reclaimed once they
4447          * call RECLAIM_COMPLETE.  NFSv4.0 clients are considered to
4448          * have reclaimed after their first OPEN.)
4449          */
4450         locks_end_grace(&nn->nfsd4_manager);
4451         /*
4452          * At this point, and once lockd and/or any other containers
4453          * exit their grace period, further reclaims will fail and
4454          * regular locking can resume.
4455          */
4456 }
4457
4458 static time_t
4459 nfs4_laundromat(struct nfsd_net *nn)
4460 {
4461         struct nfs4_client *clp;
4462         struct nfs4_openowner *oo;
4463         struct nfs4_delegation *dp;
4464         struct nfs4_ol_stateid *stp;
4465         struct list_head *pos, *next, reaplist;
4466         time_t cutoff = get_seconds() - nn->nfsd4_lease;
4467         time_t t, new_timeo = nn->nfsd4_lease;
4468
4469         dprintk("NFSD: laundromat service - starting\n");
4470         nfsd4_end_grace(nn);
4471         INIT_LIST_HEAD(&reaplist);
4472         spin_lock(&nn->client_lock);
4473         list_for_each_safe(pos, next, &nn->client_lru) {
4474                 clp = list_entry(pos, struct nfs4_client, cl_lru);
4475                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4476                         t = clp->cl_time - cutoff;
4477                         new_timeo = min(new_timeo, t);
4478                         break;
4479                 }
4480                 if (mark_client_expired_locked(clp)) {
4481                         dprintk("NFSD: client in use (clientid %08x)\n",
4482                                 clp->cl_clientid.cl_id);
4483                         continue;
4484                 }
4485                 list_add(&clp->cl_lru, &reaplist);
4486         }
4487         spin_unlock(&nn->client_lock);
4488         list_for_each_safe(pos, next, &reaplist) {
4489                 clp = list_entry(pos, struct nfs4_client, cl_lru);
4490                 dprintk("NFSD: purging unused client (clientid %08x)\n",
4491                         clp->cl_clientid.cl_id);
4492                 list_del_init(&clp->cl_lru);
4493                 expire_client(clp);
4494         }
4495         spin_lock(&state_lock);
4496         list_for_each_safe(pos, next, &nn->del_recall_lru) {
4497                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4498                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4499                         t = dp->dl_time - cutoff;
4500                         new_timeo = min(new_timeo, t);
4501                         break;
4502                 }
4503                 WARN_ON(!unhash_delegation_locked(dp));
4504                 list_add(&dp->dl_recall_lru, &reaplist);
4505         }
4506         spin_unlock(&state_lock);
4507         while (!list_empty(&reaplist)) {
4508                 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4509                                         dl_recall_lru);
4510                 list_del_init(&dp->dl_recall_lru);
4511                 revoke_delegation(dp);
4512         }
4513
4514         spin_lock(&nn->client_lock);
4515         while (!list_empty(&nn->close_lru)) {
4516                 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4517                                         oo_close_lru);
4518                 if (time_after((unsigned long)oo->oo_time,
4519                                (unsigned long)cutoff)) {
4520                         t = oo->oo_time - cutoff;
4521                         new_timeo = min(new_timeo, t);
4522                         break;
4523                 }
4524                 list_del_init(&oo->oo_close_lru);
4525                 stp = oo->oo_last_closed_stid;
4526                 oo->oo_last_closed_stid = NULL;
4527                 spin_unlock(&nn->client_lock);
4528                 nfs4_put_stid(&stp->st_stid);
4529                 spin_lock(&nn->client_lock);
4530         }
4531         spin_unlock(&nn->client_lock);
4532
4533         new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4534         return new_timeo;
4535 }
4536
4537 static struct workqueue_struct *laundry_wq;
4538 static void laundromat_main(struct work_struct *);
4539
4540 static void
4541 laundromat_main(struct work_struct *laundry)
4542 {
4543         time_t t;
4544         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
4545                                                   work);
4546         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4547                                            laundromat_work);
4548
4549         t = nfs4_laundromat(nn);
4550         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4551         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4552 }
4553
4554 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
4555 {
4556         if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
4557                 return nfserr_bad_stateid;
4558         return nfs_ok;
4559 }
4560
4561 static inline int
4562 access_permit_read(struct nfs4_ol_stateid *stp)
4563 {
4564         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4565                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4566                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4567 }
4568
4569 static inline int
4570 access_permit_write(struct nfs4_ol_stateid *stp)
4571 {
4572         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4573                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4574 }
4575
4576 static
4577 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4578 {
4579         __be32 status = nfserr_openmode;
4580
4581         /* For lock stateid's, we test the parent open, not the lock: */
4582         if (stp->st_openstp)
4583                 stp = stp->st_openstp;
4584         if ((flags & WR_STATE) && !access_permit_write(stp))
4585                 goto out;
4586         if ((flags & RD_STATE) && !access_permit_read(stp))
4587                 goto out;
4588         status = nfs_ok;
4589 out:
4590         return status;
4591 }
4592
4593 static inline __be32
4594 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4595 {
4596         if (ONE_STATEID(stateid) && (flags & RD_STATE))
4597                 return nfs_ok;
4598         else if (opens_in_grace(net)) {
4599                 /* Answer in remaining cases depends on existence of
4600                  * conflicting state; so we must wait out the grace period. */
4601                 return nfserr_grace;
4602         } else if (flags & WR_STATE)
4603                 return nfs4_share_conflict(current_fh,
4604                                 NFS4_SHARE_DENY_WRITE);
4605         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4606                 return nfs4_share_conflict(current_fh,
4607                                 NFS4_SHARE_DENY_READ);
4608 }
4609
4610 /*
4611  * Allow READ/WRITE during grace period on recovered state only for files
4612  * that are not able to provide mandatory locking.
4613  */
4614 static inline int
4615 grace_disallows_io(struct net *net, struct inode *inode)
4616 {
4617         return opens_in_grace(net) && mandatory_lock(inode);
4618 }
4619
4620 /* Returns true iff a is later than b: */
4621 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
4622 {
4623         return (s32)(a->si_generation - b->si_generation) > 0;
4624 }
4625
4626 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4627 {
4628         /*
4629          * When sessions are used the stateid generation number is ignored
4630          * when it is zero.
4631          */
4632         if (has_session && in->si_generation == 0)
4633                 return nfs_ok;
4634
4635         if (in->si_generation == ref->si_generation)
4636                 return nfs_ok;
4637
4638         /* If the client sends us a stateid from the future, it's buggy: */
4639         if (stateid_generation_after(in, ref))
4640                 return nfserr_bad_stateid;
4641         /*
4642          * However, we could see a stateid from the past, even from a
4643          * non-buggy client.  For example, if the client sends a lock
4644          * while some IO is outstanding, the lock may bump si_generation
4645          * while the IO is still in flight.  The client could avoid that
4646          * situation by waiting for responses on all the IO requests,
4647          * but better performance may result in retrying IO that
4648          * receives an old_stateid error if requests are rarely
4649          * reordered in flight:
4650          */
4651         return nfserr_old_stateid;
4652 }
4653
4654 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
4655 {
4656         if (ols->st_stateowner->so_is_open_owner &&
4657             !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4658                 return nfserr_bad_stateid;
4659         return nfs_ok;
4660 }
4661
4662 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4663 {
4664         struct nfs4_stid *s;
4665         __be32 status = nfserr_bad_stateid;
4666
4667         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4668                 return status;
4669         /* Client debugging aid. */
4670         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4671                 char addr_str[INET6_ADDRSTRLEN];
4672                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4673                                  sizeof(addr_str));
4674                 pr_warn_ratelimited("NFSD: client %s testing state ID "
4675                                         "with incorrect client ID\n", addr_str);
4676                 return status;
4677         }
4678         spin_lock(&cl->cl_lock);
4679         s = find_stateid_locked(cl, stateid);
4680         if (!s)
4681                 goto out_unlock;
4682         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
4683         if (status)
4684                 goto out_unlock;
4685         switch (s->sc_type) {
4686         case NFS4_DELEG_STID:
4687                 status = nfs_ok;
4688                 break;
4689         case NFS4_REVOKED_DELEG_STID:
4690                 status = nfserr_deleg_revoked;
4691                 break;
4692         case NFS4_OPEN_STID:
4693         case NFS4_LOCK_STID:
4694                 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
4695                 break;
4696         default:
4697                 printk("unknown stateid type %x\n", s->sc_type);
4698                 /* Fallthrough */
4699         case NFS4_CLOSED_STID:
4700         case NFS4_CLOSED_DELEG_STID:
4701                 status = nfserr_bad_stateid;
4702         }
4703 out_unlock:
4704         spin_unlock(&cl->cl_lock);
4705         return status;
4706 }
4707
4708 __be32
4709 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
4710                      stateid_t *stateid, unsigned char typemask,
4711                      struct nfs4_stid **s, struct nfsd_net *nn)
4712 {
4713         __be32 status;
4714
4715         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4716                 return nfserr_bad_stateid;
4717         status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
4718         if (status == nfserr_stale_clientid) {
4719                 if (cstate->session)
4720                         return nfserr_bad_stateid;
4721                 return nfserr_stale_stateid;
4722         }
4723         if (status)
4724                 return status;
4725         *s = find_stateid_by_type(cstate->clp, stateid, typemask);
4726         if (!*s)
4727                 return nfserr_bad_stateid;
4728         return nfs_ok;
4729 }
4730
4731 static struct file *
4732 nfs4_find_file(struct nfs4_stid *s, int flags)
4733 {
4734         if (!s)
4735                 return NULL;
4736
4737         switch (s->sc_type) {
4738         case NFS4_DELEG_STID:
4739                 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
4740                         return NULL;
4741                 return get_file(s->sc_file->fi_deleg_file);
4742         case NFS4_OPEN_STID:
4743         case NFS4_LOCK_STID:
4744                 if (flags & RD_STATE)
4745                         return find_readable_file(s->sc_file);
4746                 else
4747                         return find_writeable_file(s->sc_file);
4748                 break;
4749         }
4750
4751         return NULL;
4752 }
4753
4754 static __be32
4755 nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
4756 {
4757         __be32 status;
4758
4759         status = nfsd4_check_openowner_confirmed(ols);
4760         if (status)
4761                 return status;
4762         return nfs4_check_openmode(ols, flags);
4763 }
4764
4765 static __be32
4766 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
4767                 struct file **filpp, bool *tmp_file, int flags)
4768 {
4769         int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
4770         struct file *file;
4771         __be32 status;
4772
4773         file = nfs4_find_file(s, flags);
4774         if (file) {
4775                 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
4776                                 acc | NFSD_MAY_OWNER_OVERRIDE);
4777                 if (status) {
4778                         fput(file);
4779                         return status;
4780                 }
4781
4782                 *filpp = file;
4783         } else {
4784                 status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
4785                 if (status)
4786                         return status;
4787
4788                 if (tmp_file)
4789                         *tmp_file = true;
4790         }
4791
4792         return 0;
4793 }
4794
4795 /*
4796  * Checks for stateid operations
4797  */
4798 __be32
4799 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
4800                 struct nfsd4_compound_state *cstate, stateid_t *stateid,
4801                 int flags, struct file **filpp, bool *tmp_file)
4802 {
4803         struct svc_fh *fhp = &cstate->current_fh;
4804         struct inode *ino = d_inode(fhp->fh_dentry);
4805         struct net *net = SVC_NET(rqstp);
4806         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4807         struct nfs4_stid *s = NULL;
4808         __be32 status;
4809
4810         if (filpp)
4811                 *filpp = NULL;
4812         if (tmp_file)
4813                 *tmp_file = false;
4814
4815         if (grace_disallows_io(net, ino))
4816                 return nfserr_grace;
4817
4818         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
4819                 status = check_special_stateids(net, fhp, stateid, flags);
4820                 goto done;
4821         }
4822
4823         status = nfsd4_lookup_stateid(cstate, stateid,
4824                                 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
4825                                 &s, nn);
4826         if (status)
4827                 return status;
4828         status = check_stateid_generation(stateid, &s->sc_stateid,
4829                         nfsd4_has_session(cstate));
4830         if (status)
4831                 goto out;
4832
4833         switch (s->sc_type) {
4834         case NFS4_DELEG_STID:
4835                 status = nfs4_check_delegmode(delegstateid(s), flags);
4836                 break;
4837         case NFS4_OPEN_STID:
4838         case NFS4_LOCK_STID:
4839                 status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
4840                 break;
4841         default:
4842                 status = nfserr_bad_stateid;
4843                 break;
4844         }
4845         if (status)
4846                 goto out;
4847         status = nfs4_check_fh(fhp, s);
4848
4849 done:
4850         if (!status && filpp)
4851                 status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
4852 out:
4853         if (s)
4854                 nfs4_put_stid(s);
4855         return status;
4856 }
4857
4858 /*
4859  * Test if the stateid is valid
4860  */
4861 __be32
4862 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4863                    struct nfsd4_test_stateid *test_stateid)
4864 {
4865         struct nfsd4_test_stateid_id *stateid;
4866         struct nfs4_client *cl = cstate->session->se_client;
4867
4868         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
4869                 stateid->ts_id_status =
4870                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
4871
4872         return nfs_ok;
4873 }
4874
4875 __be32
4876 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4877                    struct nfsd4_free_stateid *free_stateid)
4878 {
4879         stateid_t *stateid = &free_stateid->fr_stateid;
4880         struct nfs4_stid *s;
4881         struct nfs4_delegation *dp;
4882         struct nfs4_ol_stateid *stp;
4883         struct nfs4_client *cl = cstate->session->se_client;
4884         __be32 ret = nfserr_bad_stateid;
4885
4886         spin_lock(&cl->cl_lock);
4887         s = find_stateid_locked(cl, stateid);
4888         if (!s)
4889                 goto out_unlock;
4890         switch (s->sc_type) {
4891         case NFS4_DELEG_STID:
4892                 ret = nfserr_locks_held;
4893                 break;
4894         case NFS4_OPEN_STID:
4895                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
4896                 if (ret)
4897                         break;
4898                 ret = nfserr_locks_held;
4899                 break;
4900         case NFS4_LOCK_STID:
4901                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
4902                 if (ret)
4903                         break;
4904                 stp = openlockstateid(s);
4905                 ret = nfserr_locks_held;
4906                 if (check_for_locks(stp->st_stid.sc_file,
4907                                     lockowner(stp->st_stateowner)))
4908                         break;
4909                 WARN_ON(!unhash_lock_stateid(stp));
4910                 spin_unlock(&cl->cl_lock);
4911                 nfs4_put_stid(s);
4912                 ret = nfs_ok;
4913                 goto out;
4914         case NFS4_REVOKED_DELEG_STID:
4915                 dp = delegstateid(s);
4916                 list_del_init(&dp->dl_recall_lru);
4917                 spin_unlock(&cl->cl_lock);
4918                 nfs4_put_stid(s);
4919                 ret = nfs_ok;
4920                 goto out;
4921         /* Default falls through and returns nfserr_bad_stateid */
4922         }
4923 out_unlock:
4924         spin_unlock(&cl->cl_lock);
4925 out:
4926         return ret;
4927 }
4928
4929 static inline int
4930 setlkflg (int type)
4931 {
4932         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
4933                 RD_STATE : WR_STATE;
4934 }
4935
4936 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
4937 {
4938         struct svc_fh *current_fh = &cstate->current_fh;
4939         struct nfs4_stateowner *sop = stp->st_stateowner;
4940         __be32 status;
4941
4942         status = nfsd4_check_seqid(cstate, sop, seqid);
4943         if (status)
4944                 return status;
4945         if (stp->st_stid.sc_type == NFS4_CLOSED_STID
4946                 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4947                 /*
4948                  * "Closed" stateid's exist *only* to return
4949                  * nfserr_replay_me from the previous step, and
4950                  * revoked delegations are kept only for free_stateid.
4951                  */
4952                 return nfserr_bad_stateid;
4953         down_write(&stp->st_rwsem);
4954         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
4955         if (status == nfs_ok)
4956                 status = nfs4_check_fh(current_fh, &stp->st_stid);
4957         if (status != nfs_ok)
4958                 up_write(&stp->st_rwsem);
4959         return status;
4960 }
4961
4962 /*
4963  * Checks for sequence id mutating operations.
4964  */
4965 static __be32
4966 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
4967                          stateid_t *stateid, char typemask,
4968                          struct nfs4_ol_stateid **stpp,
4969                          struct nfsd_net *nn)
4970 {
4971         __be32 status;
4972         struct nfs4_stid *s;
4973         struct nfs4_ol_stateid *stp = NULL;
4974
4975         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
4976                 seqid, STATEID_VAL(stateid));
4977
4978         *stpp = NULL;
4979         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
4980         if (status)
4981                 return status;
4982         stp = openlockstateid(s);
4983         nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
4984
4985         status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
4986         if (!status)
4987                 *stpp = stp;
4988         else
4989                 nfs4_put_stid(&stp->st_stid);
4990         return status;
4991 }
4992
4993 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
4994                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
4995 {
4996         __be32 status;
4997         struct nfs4_openowner *oo;
4998         struct nfs4_ol_stateid *stp;
4999
5000         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5001                                                 NFS4_OPEN_STID, &stp, nn);
5002         if (status)
5003                 return status;
5004         oo = openowner(stp->st_stateowner);
5005         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5006                 up_write(&stp->st_rwsem);
5007                 nfs4_put_stid(&stp->st_stid);
5008                 return nfserr_bad_stateid;
5009         }
5010         *stpp = stp;
5011         return nfs_ok;
5012 }
5013
5014 __be32
5015 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5016                    struct nfsd4_open_confirm *oc)
5017 {
5018         __be32 status;
5019         struct nfs4_openowner *oo;
5020         struct nfs4_ol_stateid *stp;
5021         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5022
5023         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5024                         cstate->current_fh.fh_dentry);
5025
5026         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5027         if (status)
5028                 return status;
5029
5030         status = nfs4_preprocess_seqid_op(cstate,
5031                                         oc->oc_seqid, &oc->oc_req_stateid,
5032                                         NFS4_OPEN_STID, &stp, nn);
5033         if (status)
5034                 goto out;
5035         oo = openowner(stp->st_stateowner);
5036         status = nfserr_bad_stateid;
5037         if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5038                 up_write(&stp->st_rwsem);
5039                 goto put_stateid;
5040         }
5041         oo->oo_flags |= NFS4_OO_CONFIRMED;
5042         nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5043         up_write(&stp->st_rwsem);
5044         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5045                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5046
5047         nfsd4_client_record_create(oo->oo_owner.so_client);
5048         status = nfs_ok;
5049 put_stateid:
5050         nfs4_put_stid(&stp->st_stid);
5051 out:
5052         nfsd4_bump_seqid(cstate, status);
5053         return status;
5054 }
5055
5056 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5057 {
5058         if (!test_access(access, stp))
5059                 return;
5060         nfs4_file_put_access(stp->st_stid.sc_file, access);
5061         clear_access(access, stp);
5062 }
5063
5064 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5065 {
5066         switch (to_access) {
5067         case NFS4_SHARE_ACCESS_READ:
5068                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5069                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5070                 break;
5071         case NFS4_SHARE_ACCESS_WRITE:
5072                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5073                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5074                 break;
5075         case NFS4_SHARE_ACCESS_BOTH:
5076                 break;
5077         default:
5078                 WARN_ON_ONCE(1);
5079         }
5080 }
5081
5082 __be32
5083 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5084                      struct nfsd4_compound_state *cstate,
5085                      struct nfsd4_open_downgrade *od)
5086 {
5087         __be32 status;
5088         struct nfs4_ol_stateid *stp;
5089         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5090
5091         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5092                         cstate->current_fh.fh_dentry);
5093
5094         /* We don't yet support WANT bits: */
5095         if (od->od_deleg_want)
5096                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5097                         od->od_deleg_want);
5098
5099         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5100                                         &od->od_stateid, &stp, nn);
5101         if (status)
5102                 goto out;
5103         status = nfserr_inval;
5104         if (!test_access(od->od_share_access, stp)) {
5105                 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5106                         stp->st_access_bmap, od->od_share_access);
5107                 goto put_stateid;
5108         }
5109         if (!test_deny(od->od_share_deny, stp)) {
5110                 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5111                         stp->st_deny_bmap, od->od_share_deny);
5112                 goto put_stateid;
5113         }
5114         nfs4_stateid_downgrade(stp, od->od_share_access);
5115         reset_union_bmap_deny(od->od_share_deny, stp);
5116         nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5117         status = nfs_ok;
5118 put_stateid:
5119         up_write(&stp->st_rwsem);
5120         nfs4_put_stid(&stp->st_stid);
5121 out:
5122         nfsd4_bump_seqid(cstate, status);
5123         return status;
5124 }
5125
5126 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5127 {
5128         struct nfs4_client *clp = s->st_stid.sc_client;
5129         bool unhashed;
5130         LIST_HEAD(reaplist);
5131
5132         s->st_stid.sc_type = NFS4_CLOSED_STID;
5133         spin_lock(&clp->cl_lock);
5134         unhashed = unhash_open_stateid(s, &reaplist);
5135
5136         if (clp->cl_minorversion) {
5137                 if (unhashed)
5138                         put_ol_stateid_locked(s, &reaplist);
5139                 spin_unlock(&clp->cl_lock);
5140                 free_ol_stateid_reaplist(&reaplist);
5141         } else {
5142                 spin_unlock(&clp->cl_lock);
5143                 free_ol_stateid_reaplist(&reaplist);
5144                 if (unhashed)
5145                         move_to_close_lru(s, clp->net);
5146         }
5147 }
5148
5149 /*
5150  * nfs4_unlock_state() called after encode
5151  */
5152 __be32
5153 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5154             struct nfsd4_close *close)
5155 {
5156         __be32 status;
5157         struct nfs4_ol_stateid *stp;
5158         struct net *net = SVC_NET(rqstp);
5159         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5160
5161         dprintk("NFSD: nfsd4_close on file %pd\n",
5162                         cstate->current_fh.fh_dentry);
5163
5164         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5165                                         &close->cl_stateid,
5166                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
5167                                         &stp, nn);
5168         nfsd4_bump_seqid(cstate, status);
5169         if (status)
5170                 goto out;
5171         nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
5172         up_write(&stp->st_rwsem);
5173
5174         nfsd4_close_open_stateid(stp);
5175
5176         /* put reference from nfs4_preprocess_seqid_op */
5177         nfs4_put_stid(&stp->st_stid);
5178 out:
5179         return status;
5180 }
5181
5182 __be32
5183 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5184                   struct nfsd4_delegreturn *dr)
5185 {
5186         struct nfs4_delegation *dp;
5187         stateid_t *stateid = &dr->dr_stateid;
5188         struct nfs4_stid *s;
5189         __be32 status;
5190         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5191
5192         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5193                 return status;
5194
5195         status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
5196         if (status)
5197                 goto out;
5198         dp = delegstateid(s);
5199         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
5200         if (status)
5201                 goto put_stateid;
5202
5203         destroy_delegation(dp);
5204 put_stateid:
5205         nfs4_put_stid(&dp->dl_stid);
5206 out:
5207         return status;
5208 }
5209
5210 static inline u64
5211 end_offset(u64 start, u64 len)
5212 {
5213         u64 end;
5214
5215         end = start + len;
5216         return end >= start ? end: NFS4_MAX_UINT64;
5217 }
5218
5219 /* last octet in a range */
5220 static inline u64
5221 last_byte_offset(u64 start, u64 len)
5222 {
5223         u64 end;
5224
5225         WARN_ON_ONCE(!len);
5226         end = start + len;
5227         return end > start ? end - 1: NFS4_MAX_UINT64;
5228 }
5229
5230 /*
5231  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5232  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5233  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
5234  * locking, this prevents us from being completely protocol-compliant.  The
5235  * real solution to this problem is to start using unsigned file offsets in
5236  * the VFS, but this is a very deep change!
5237  */
5238 static inline void
5239 nfs4_transform_lock_offset(struct file_lock *lock)
5240 {
5241         if (lock->fl_start < 0)
5242                 lock->fl_start = OFFSET_MAX;
5243         if (lock->fl_end < 0)
5244                 lock->fl_end = OFFSET_MAX;
5245 }
5246
5247 static fl_owner_t
5248 nfsd4_fl_get_owner(fl_owner_t owner)
5249 {
5250         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5251
5252         nfs4_get_stateowner(&lo->lo_owner);
5253         return owner;
5254 }
5255
5256 static void
5257 nfsd4_fl_put_owner(fl_owner_t owner)
5258 {
5259         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5260
5261         if (lo)
5262                 nfs4_put_stateowner(&lo->lo_owner);
5263 }
5264
5265 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
5266         .lm_get_owner = nfsd4_fl_get_owner,
5267         .lm_put_owner = nfsd4_fl_put_owner,
5268 };
5269
5270 static inline void
5271 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
5272 {
5273         struct nfs4_lockowner *lo;
5274
5275         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
5276                 lo = (struct nfs4_lockowner *) fl->fl_owner;
5277                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
5278                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
5279                 if (!deny->ld_owner.data)
5280                         /* We just don't care that much */
5281                         goto nevermind;
5282                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
5283                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
5284         } else {
5285 nevermind:
5286                 deny->ld_owner.len = 0;
5287                 deny->ld_owner.data = NULL;
5288                 deny->ld_clientid.cl_boot = 0;
5289                 deny->ld_clientid.cl_id = 0;
5290         }
5291         deny->ld_start = fl->fl_start;
5292         deny->ld_length = NFS4_MAX_UINT64;
5293         if (fl->fl_end != NFS4_MAX_UINT64)
5294                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
5295         deny->ld_type = NFS4_READ_LT;
5296         if (fl->fl_type != F_RDLCK)
5297                 deny->ld_type = NFS4_WRITE_LT;
5298 }
5299
5300 static struct nfs4_lockowner *
5301 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
5302 {
5303         unsigned int strhashval = ownerstr_hashval(owner);
5304         struct nfs4_stateowner *so;
5305
5306         lockdep_assert_held(&clp->cl_lock);
5307
5308         list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
5309                             so_strhash) {
5310                 if (so->so_is_open_owner)
5311                         continue;
5312                 if (same_owner_str(so, owner))
5313                         return lockowner(nfs4_get_stateowner(so));
5314         }
5315         return NULL;
5316 }
5317
5318 static struct nfs4_lockowner *
5319 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
5320 {
5321         struct nfs4_lockowner *lo;
5322
5323         spin_lock(&clp->cl_lock);
5324         lo = find_lockowner_str_locked(clp, owner);
5325         spin_unlock(&clp->cl_lock);
5326         return lo;
5327 }
5328
5329 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
5330 {
5331         unhash_lockowner_locked(lockowner(sop));
5332 }
5333
5334 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
5335 {
5336         struct nfs4_lockowner *lo = lockowner(sop);
5337
5338         kmem_cache_free(lockowner_slab, lo);
5339 }
5340
5341 static const struct nfs4_stateowner_operations lockowner_ops = {
5342         .so_unhash =    nfs4_unhash_lockowner,
5343         .so_free =      nfs4_free_lockowner,
5344 };
5345
5346 /*
5347  * Alloc a lock owner structure.
5348  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5349  * occurred.
5350  *
5351  * strhashval = ownerstr_hashval
5352  */
5353 static struct nfs4_lockowner *
5354 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5355                            struct nfs4_ol_stateid *open_stp,
5356                            struct nfsd4_lock *lock)
5357 {
5358         struct nfs4_lockowner *lo, *ret;
5359
5360         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5361         if (!lo)
5362                 return NULL;
5363         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5364         lo->lo_owner.so_is_open_owner = 0;
5365         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5366         lo->lo_owner.so_ops = &lockowner_ops;
5367         spin_lock(&clp->cl_lock);
5368         ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
5369         if (ret == NULL) {
5370                 list_add(&lo->lo_owner.so_strhash,
5371                          &clp->cl_ownerstr_hashtbl[strhashval]);
5372                 ret = lo;
5373         } else
5374                 nfs4_free_stateowner(&lo->lo_owner);
5375
5376         spin_unlock(&clp->cl_lock);
5377         return ret;
5378 }
5379
5380 static void
5381 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5382                   struct nfs4_file *fp, struct inode *inode,
5383                   struct nfs4_ol_stateid *open_stp)
5384 {
5385         struct nfs4_client *clp = lo->lo_owner.so_client;
5386
5387         lockdep_assert_held(&clp->cl_lock);
5388
5389         atomic_inc(&stp->st_stid.sc_count);
5390         stp->st_stid.sc_type = NFS4_LOCK_STID;
5391         stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
5392         get_nfs4_file(fp);
5393         stp->st_stid.sc_file = fp;
5394         stp->st_stid.sc_free = nfs4_free_lock_stateid;
5395         stp->st_access_bmap = 0;
5396         stp->st_deny_bmap = open_stp->st_deny_bmap;
5397         stp->st_openstp = open_stp;
5398         init_rwsem(&stp->st_rwsem);
5399         list_add(&stp->st_locks, &open_stp->st_locks);
5400         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5401         spin_lock(&fp->fi_lock);
5402         list_add(&stp->st_perfile, &fp->fi_stateids);
5403         spin_unlock(&fp->fi_lock);
5404 }
5405
5406 static struct nfs4_ol_stateid *
5407 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5408 {
5409         struct nfs4_ol_stateid *lst;
5410         struct nfs4_client *clp = lo->lo_owner.so_client;
5411
5412         lockdep_assert_held(&clp->cl_lock);
5413
5414         list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5415                 if (lst->st_stid.sc_file == fp) {
5416                         atomic_inc(&lst->st_stid.sc_count);
5417                         return lst;
5418                 }
5419         }
5420         return NULL;
5421 }
5422
5423 static struct nfs4_ol_stateid *
5424 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5425                             struct inode *inode, struct nfs4_ol_stateid *ost,
5426                             bool *new)
5427 {
5428         struct nfs4_stid *ns = NULL;
5429         struct nfs4_ol_stateid *lst;
5430         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5431         struct nfs4_client *clp = oo->oo_owner.so_client;
5432
5433         spin_lock(&clp->cl_lock);
5434         lst = find_lock_stateid(lo, fi);
5435         if (lst == NULL) {
5436                 spin_unlock(&clp->cl_lock);
5437                 ns = nfs4_alloc_stid(clp, stateid_slab);
5438                 if (ns == NULL)
5439                         return NULL;
5440
5441                 spin_lock(&clp->cl_lock);
5442                 lst = find_lock_stateid(lo, fi);
5443                 if (likely(!lst)) {
5444                         lst = openlockstateid(ns);
5445                         init_lock_stateid(lst, lo, fi, inode, ost);
5446                         ns = NULL;
5447                         *new = true;
5448                 }
5449         }
5450         spin_unlock(&clp->cl_lock);
5451         if (ns)
5452                 nfs4_put_stid(ns);
5453         return lst;
5454 }
5455
5456 static int
5457 check_lock_length(u64 offset, u64 length)
5458 {
5459         return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5460                 (length > ~offset)));
5461 }
5462
5463 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5464 {
5465         struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5466
5467         lockdep_assert_held(&fp->fi_lock);
5468
5469         if (test_access(access, lock_stp))
5470                 return;
5471         __nfs4_file_get_access(fp, access);
5472         set_access(access, lock_stp);
5473 }
5474
5475 static __be32
5476 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5477                             struct nfs4_ol_stateid *ost,
5478                             struct nfsd4_lock *lock,
5479                             struct nfs4_ol_stateid **lst, bool *new)
5480 {
5481         __be32 status;
5482         struct nfs4_file *fi = ost->st_stid.sc_file;
5483         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5484         struct nfs4_client *cl = oo->oo_owner.so_client;
5485         struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
5486         struct nfs4_lockowner *lo;
5487         unsigned int strhashval;
5488
5489         lo = find_lockowner_str(cl, &lock->lk_new_owner);
5490         if (!lo) {
5491                 strhashval = ownerstr_hashval(&lock->lk_new_owner);
5492                 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5493                 if (lo == NULL)
5494                         return nfserr_jukebox;
5495         } else {
5496                 /* with an existing lockowner, seqids must be the same */
5497                 status = nfserr_bad_seqid;
5498                 if (!cstate->minorversion &&
5499                     lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5500                         goto out;
5501         }
5502
5503         *lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5504         if (*lst == NULL) {
5505                 status = nfserr_jukebox;
5506                 goto out;
5507         }
5508         status = nfs_ok;
5509 out:
5510         nfs4_put_stateowner(&lo->lo_owner);
5511         return status;
5512 }
5513
5514 /*
5515  *  LOCK operation
5516  */
5517 __be32
5518 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5519            struct nfsd4_lock *lock)
5520 {
5521         struct nfs4_openowner *open_sop = NULL;
5522         struct nfs4_lockowner *lock_sop = NULL;
5523         struct nfs4_ol_stateid *lock_stp = NULL;
5524         struct nfs4_ol_stateid *open_stp = NULL;
5525         struct nfs4_file *fp;
5526         struct file *filp = NULL;
5527         struct file_lock *file_lock = NULL;
5528         struct file_lock *conflock = NULL;
5529         __be32 status = 0;
5530         int lkflg;
5531         int err;
5532         bool new = false;
5533         struct net *net = SVC_NET(rqstp);
5534         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5535
5536         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5537                 (long long) lock->lk_offset,
5538                 (long long) lock->lk_length);
5539
5540         if (check_lock_length(lock->lk_offset, lock->lk_length))
5541                  return nfserr_inval;
5542
5543         if ((status = fh_verify(rqstp, &cstate->current_fh,
5544                                 S_IFREG, NFSD_MAY_LOCK))) {
5545                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5546                 return status;
5547         }
5548
5549         if (lock->lk_is_new) {
5550                 if (nfsd4_has_session(cstate))
5551                         /* See rfc 5661 18.10.3: given clientid is ignored: */
5552                         memcpy(&lock->lk_new_clientid,
5553                                 &cstate->session->se_client->cl_clientid,
5554                                 sizeof(clientid_t));
5555
5556                 status = nfserr_stale_clientid;
5557                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5558                         goto out;
5559
5560                 /* validate and update open stateid and open seqid */
5561                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5562                                         lock->lk_new_open_seqid,
5563                                         &lock->lk_new_open_stateid,
5564                                         &open_stp, nn);
5565                 if (status)
5566                         goto out;
5567                 up_write(&open_stp->st_rwsem);
5568                 open_sop = openowner(open_stp->st_stateowner);
5569                 status = nfserr_bad_stateid;
5570                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5571                                                 &lock->lk_new_clientid))
5572                         goto out;
5573                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5574                                                         &lock_stp, &new);
5575                 if (status == nfs_ok)
5576                         down_write(&lock_stp->st_rwsem);
5577         } else {
5578                 status = nfs4_preprocess_seqid_op(cstate,
5579                                        lock->lk_old_lock_seqid,
5580                                        &lock->lk_old_lock_stateid,
5581                                        NFS4_LOCK_STID, &lock_stp, nn);
5582         }
5583         if (status)
5584                 goto out;
5585         lock_sop = lockowner(lock_stp->st_stateowner);
5586
5587         lkflg = setlkflg(lock->lk_type);
5588         status = nfs4_check_openmode(lock_stp, lkflg);
5589         if (status)
5590                 goto out;
5591
5592         status = nfserr_grace;
5593         if (locks_in_grace(net) && !lock->lk_reclaim)
5594                 goto out;
5595         status = nfserr_no_grace;
5596         if (!locks_in_grace(net) && lock->lk_reclaim)
5597                 goto out;
5598
5599         file_lock = locks_alloc_lock();
5600         if (!file_lock) {
5601                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5602                 status = nfserr_jukebox;
5603                 goto out;
5604         }
5605
5606         fp = lock_stp->st_stid.sc_file;
5607         switch (lock->lk_type) {
5608                 case NFS4_READ_LT:
5609                 case NFS4_READW_LT:
5610                         spin_lock(&fp->fi_lock);
5611                         filp = find_readable_file_locked(fp);
5612                         if (filp)
5613                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
5614                         spin_unlock(&fp->fi_lock);
5615                         file_lock->fl_type = F_RDLCK;
5616                         break;
5617                 case NFS4_WRITE_LT:
5618                 case NFS4_WRITEW_LT:
5619                         spin_lock(&fp->fi_lock);
5620                         filp = find_writeable_file_locked(fp);
5621                         if (filp)
5622                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
5623                         spin_unlock(&fp->fi_lock);
5624                         file_lock->fl_type = F_WRLCK;
5625                         break;
5626                 default:
5627                         status = nfserr_inval;
5628                 goto out;
5629         }
5630         if (!filp) {
5631                 status = nfserr_openmode;
5632                 goto out;
5633         }
5634
5635         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
5636         file_lock->fl_pid = current->tgid;
5637         file_lock->fl_file = filp;
5638         file_lock->fl_flags = FL_POSIX;
5639         file_lock->fl_lmops = &nfsd_posix_mng_ops;
5640         file_lock->fl_start = lock->lk_offset;
5641         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
5642         nfs4_transform_lock_offset(file_lock);
5643
5644         conflock = locks_alloc_lock();
5645         if (!conflock) {
5646                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5647                 status = nfserr_jukebox;
5648                 goto out;
5649         }
5650
5651         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
5652         switch (-err) {
5653         case 0: /* success! */
5654                 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
5655                 status = 0;
5656                 break;
5657         case (EAGAIN):          /* conflock holds conflicting lock */
5658                 status = nfserr_denied;
5659                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
5660                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
5661                 break;
5662         case (EDEADLK):
5663                 status = nfserr_deadlock;
5664                 break;
5665         default:
5666                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
5667                 status = nfserrno(err);
5668                 break;
5669         }
5670 out:
5671         if (filp)
5672                 fput(filp);
5673         if (lock_stp) {
5674                 /* Bump seqid manually if the 4.0 replay owner is openowner */
5675                 if (cstate->replay_owner &&
5676                     cstate->replay_owner != &lock_sop->lo_owner &&
5677                     seqid_mutating_err(ntohl(status)))
5678                         lock_sop->lo_owner.so_seqid++;
5679
5680                 up_write(&lock_stp->st_rwsem);
5681
5682                 /*
5683                  * If this is a new, never-before-used stateid, and we are
5684                  * returning an error, then just go ahead and release it.
5685                  */
5686                 if (status && new)
5687                         release_lock_stateid(lock_stp);
5688
5689                 nfs4_put_stid(&lock_stp->st_stid);
5690         }
5691         if (open_stp)
5692                 nfs4_put_stid(&open_stp->st_stid);
5693         nfsd4_bump_seqid(cstate, status);
5694         if (file_lock)
5695                 locks_free_lock(file_lock);
5696         if (conflock)
5697                 locks_free_lock(conflock);
5698         return status;
5699 }
5700
5701 /*
5702  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
5703  * so we do a temporary open here just to get an open file to pass to
5704  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
5705  * inode operation.)
5706  */
5707 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
5708 {
5709         struct file *file;
5710         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
5711         if (!err) {
5712                 err = nfserrno(vfs_test_lock(file, lock));
5713                 fput(file);
5714         }
5715         return err;
5716 }
5717
5718 /*
5719  * LOCKT operation
5720  */
5721 __be32
5722 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5723             struct nfsd4_lockt *lockt)
5724 {
5725         struct file_lock *file_lock = NULL;
5726         struct nfs4_lockowner *lo = NULL;
5727         __be32 status;
5728         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5729
5730         if (locks_in_grace(SVC_NET(rqstp)))
5731                 return nfserr_grace;
5732
5733         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
5734                  return nfserr_inval;
5735
5736         if (!nfsd4_has_session(cstate)) {
5737                 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
5738                 if (status)
5739                         goto out;
5740         }
5741
5742         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5743                 goto out;
5744
5745         file_lock = locks_alloc_lock();
5746         if (!file_lock) {
5747                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5748                 status = nfserr_jukebox;
5749                 goto out;
5750         }
5751
5752         switch (lockt->lt_type) {
5753                 case NFS4_READ_LT:
5754                 case NFS4_READW_LT:
5755                         file_lock->fl_type = F_RDLCK;
5756                 break;
5757                 case NFS4_WRITE_LT:
5758                 case NFS4_WRITEW_LT:
5759                         file_lock->fl_type = F_WRLCK;
5760                 break;
5761                 default:
5762                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
5763                         status = nfserr_inval;
5764                 goto out;
5765         }
5766
5767         lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
5768         if (lo)
5769                 file_lock->fl_owner = (fl_owner_t)lo;
5770         file_lock->fl_pid = current->tgid;
5771         file_lock->fl_flags = FL_POSIX;
5772
5773         file_lock->fl_start = lockt->lt_offset;
5774         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
5775
5776         nfs4_transform_lock_offset(file_lock);
5777
5778         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
5779         if (status)
5780                 goto out;
5781
5782         if (file_lock->fl_type != F_UNLCK) {
5783                 status = nfserr_denied;
5784                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
5785         }
5786 out:
5787         if (lo)
5788                 nfs4_put_stateowner(&lo->lo_owner);
5789         if (file_lock)
5790                 locks_free_lock(file_lock);
5791         return status;
5792 }
5793
5794 __be32
5795 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5796             struct nfsd4_locku *locku)
5797 {
5798         struct nfs4_ol_stateid *stp;
5799         struct file *filp = NULL;
5800         struct file_lock *file_lock = NULL;
5801         __be32 status;
5802         int err;
5803         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5804
5805         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
5806                 (long long) locku->lu_offset,
5807                 (long long) locku->lu_length);
5808
5809         if (check_lock_length(locku->lu_offset, locku->lu_length))
5810                  return nfserr_inval;
5811
5812         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
5813                                         &locku->lu_stateid, NFS4_LOCK_STID,
5814                                         &stp, nn);
5815         if (status)
5816                 goto out;
5817         filp = find_any_file(stp->st_stid.sc_file);
5818         if (!filp) {
5819                 status = nfserr_lock_range;
5820                 goto put_stateid;
5821         }
5822         file_lock = locks_alloc_lock();
5823         if (!file_lock) {
5824                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5825                 status = nfserr_jukebox;
5826                 goto fput;
5827         }
5828
5829         file_lock->fl_type = F_UNLCK;
5830         file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
5831         file_lock->fl_pid = current->tgid;
5832         file_lock->fl_file = filp;
5833         file_lock->fl_flags = FL_POSIX;
5834         file_lock->fl_lmops = &nfsd_posix_mng_ops;
5835         file_lock->fl_start = locku->lu_offset;
5836
5837         file_lock->fl_end = last_byte_offset(locku->lu_offset,
5838                                                 locku->lu_length);
5839         nfs4_transform_lock_offset(file_lock);
5840
5841         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
5842         if (err) {
5843                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
5844                 goto out_nfserr;
5845         }
5846         nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
5847 fput:
5848         fput(filp);
5849 put_stateid:
5850         up_write(&stp->st_rwsem);
5851         nfs4_put_stid(&stp->st_stid);
5852 out:
5853         nfsd4_bump_seqid(cstate, status);
5854         if (file_lock)
5855                 locks_free_lock(file_lock);
5856         return status;
5857
5858 out_nfserr:
5859         status = nfserrno(err);
5860         goto fput;
5861 }
5862
5863 /*
5864  * returns
5865  *      true:  locks held by lockowner
5866  *      false: no locks held by lockowner
5867  */
5868 static bool
5869 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
5870 {
5871         struct file_lock *fl;
5872         int status = false;
5873         struct file *filp = find_any_file(fp);
5874         struct inode *inode;
5875         struct file_lock_context *flctx;
5876
5877         if (!filp) {
5878                 /* Any valid lock stateid should have some sort of access */
5879                 WARN_ON_ONCE(1);
5880                 return status;
5881         }
5882
5883         inode = file_inode(filp);
5884         flctx = inode->i_flctx;
5885
5886         if (flctx && !list_empty_careful(&flctx->flc_posix)) {
5887                 spin_lock(&flctx->flc_lock);
5888                 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
5889                         if (fl->fl_owner == (fl_owner_t)lowner) {
5890                                 status = true;
5891                                 break;
5892                         }
5893                 }
5894                 spin_unlock(&flctx->flc_lock);
5895         }
5896         fput(filp);
5897         return status;
5898 }
5899
5900 __be32
5901 nfsd4_release_lockowner(struct svc_rqst *rqstp,
5902                         struct nfsd4_compound_state *cstate,
5903                         struct nfsd4_release_lockowner *rlockowner)
5904 {
5905         clientid_t *clid = &rlockowner->rl_clientid;
5906         struct nfs4_stateowner *sop;
5907         struct nfs4_lockowner *lo = NULL;
5908         struct nfs4_ol_stateid *stp;
5909         struct xdr_netobj *owner = &rlockowner->rl_owner;
5910         unsigned int hashval = ownerstr_hashval(owner);
5911         __be32 status;
5912         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5913         struct nfs4_client *clp;
5914
5915         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
5916                 clid->cl_boot, clid->cl_id);
5917
5918         status = lookup_clientid(clid, cstate, nn);
5919         if (status)
5920                 return status;
5921
5922         clp = cstate->clp;
5923         /* Find the matching lock stateowner */
5924         spin_lock(&clp->cl_lock);
5925         list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
5926                             so_strhash) {
5927
5928                 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
5929                         continue;
5930
5931                 /* see if there are still any locks associated with it */
5932                 lo = lockowner(sop);
5933                 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
5934                         if (check_for_locks(stp->st_stid.sc_file, lo)) {
5935                                 status = nfserr_locks_held;
5936                                 spin_unlock(&clp->cl_lock);
5937                                 return status;
5938                         }
5939                 }
5940
5941                 nfs4_get_stateowner(sop);
5942                 break;
5943         }
5944         spin_unlock(&clp->cl_lock);
5945         if (lo)
5946                 release_lockowner(lo);
5947         return status;
5948 }
5949
5950 static inline struct nfs4_client_reclaim *
5951 alloc_reclaim(void)
5952 {
5953         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
5954 }
5955
5956 bool
5957 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
5958 {
5959         struct nfs4_client_reclaim *crp;
5960
5961         crp = nfsd4_find_reclaim_client(name, nn);
5962         return (crp && crp->cr_clp);
5963 }
5964
5965 /*
5966  * failure => all reset bets are off, nfserr_no_grace...
5967  */
5968 struct nfs4_client_reclaim *
5969 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
5970 {
5971         unsigned int strhashval;
5972         struct nfs4_client_reclaim *crp;
5973
5974         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
5975         crp = alloc_reclaim();
5976         if (crp) {
5977                 strhashval = clientstr_hashval(name);
5978                 INIT_LIST_HEAD(&crp->cr_strhash);
5979                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
5980                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
5981                 crp->cr_clp = NULL;
5982                 nn->reclaim_str_hashtbl_size++;
5983         }
5984         return crp;
5985 }
5986
5987 void
5988 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
5989 {
5990         list_del(&crp->cr_strhash);
5991         kfree(crp);
5992         nn->reclaim_str_hashtbl_size--;
5993 }
5994
5995 void
5996 nfs4_release_reclaim(struct nfsd_net *nn)
5997 {
5998         struct nfs4_client_reclaim *crp = NULL;
5999         int i;
6000
6001         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6002                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6003                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6004                                         struct nfs4_client_reclaim, cr_strhash);
6005                         nfs4_remove_reclaim_record(crp, nn);
6006                 }
6007         }
6008         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6009 }
6010
6011 /*
6012  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6013 struct nfs4_client_reclaim *
6014 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
6015 {
6016         unsigned int strhashval;
6017         struct nfs4_client_reclaim *crp = NULL;
6018
6019         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
6020
6021         strhashval = clientstr_hashval(recdir);
6022         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6023                 if (same_name(crp->cr_recdir, recdir)) {
6024                         return crp;
6025                 }
6026         }
6027         return NULL;
6028 }
6029
6030 /*
6031 * Called from OPEN. Look for clientid in reclaim list.
6032 */
6033 __be32
6034 nfs4_check_open_reclaim(clientid_t *clid,
6035                 struct nfsd4_compound_state *cstate,
6036                 struct nfsd_net *nn)
6037 {
6038         __be32 status;
6039
6040         /* find clientid in conf_id_hashtbl */
6041         status = lookup_clientid(clid, cstate, nn);
6042         if (status)
6043                 return nfserr_reclaim_bad;
6044
6045         if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6046                 return nfserr_no_grace;
6047
6048         if (nfsd4_client_record_check(cstate->clp))
6049                 return nfserr_reclaim_bad;
6050
6051         return nfs_ok;
6052 }
6053
6054 #ifdef CONFIG_NFSD_FAULT_INJECTION
6055 static inline void
6056 put_client(struct nfs4_client *clp)
6057 {
6058         atomic_dec(&clp->cl_refcount);
6059 }
6060
6061 static struct nfs4_client *
6062 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
6063 {
6064         struct nfs4_client *clp;
6065         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6066                                           nfsd_net_id);
6067
6068         if (!nfsd_netns_ready(nn))
6069                 return NULL;
6070
6071         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6072                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
6073                         return clp;
6074         }
6075         return NULL;
6076 }
6077
6078 u64
6079 nfsd_inject_print_clients(void)
6080 {
6081         struct nfs4_client *clp;
6082         u64 count = 0;
6083         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6084                                           nfsd_net_id);
6085         char buf[INET6_ADDRSTRLEN];
6086
6087         if (!nfsd_netns_ready(nn))
6088                 return 0;
6089
6090         spin_lock(&nn->client_lock);
6091         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6092                 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6093                 pr_info("NFS Client: %s\n", buf);
6094                 ++count;
6095         }
6096         spin_unlock(&nn->client_lock);
6097
6098         return count;
6099 }
6100
6101 u64
6102 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
6103 {
6104         u64 count = 0;
6105         struct nfs4_client *clp;
6106         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6107                                           nfsd_net_id);
6108
6109         if (!nfsd_netns_ready(nn))
6110                 return count;
6111
6112         spin_lock(&nn->client_lock);
6113         clp = nfsd_find_client(addr, addr_size);
6114         if (clp) {
6115                 if (mark_client_expired_locked(clp) == nfs_ok)
6116                         ++count;
6117                 else
6118                         clp = NULL;
6119         }
6120         spin_unlock(&nn->client_lock);
6121
6122         if (clp)
6123                 expire_client(clp);
6124
6125         return count;
6126 }
6127
6128 u64
6129 nfsd_inject_forget_clients(u64 max)
6130 {
6131         u64 count = 0;
6132         struct nfs4_client *clp, *next;
6133         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6134                                                 nfsd_net_id);
6135         LIST_HEAD(reaplist);
6136
6137         if (!nfsd_netns_ready(nn))
6138                 return count;
6139
6140         spin_lock(&nn->client_lock);
6141         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6142                 if (mark_client_expired_locked(clp) == nfs_ok) {
6143                         list_add(&clp->cl_lru, &reaplist);
6144                         if (max != 0 && ++count >= max)
6145                                 break;
6146                 }
6147         }
6148         spin_unlock(&nn->client_lock);
6149
6150         list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
6151                 expire_client(clp);
6152
6153         return count;
6154 }
6155
6156 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
6157                              const char *type)
6158 {
6159         char buf[INET6_ADDRSTRLEN];
6160         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6161         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
6162 }
6163
6164 static void
6165 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
6166                              struct list_head *collect)
6167 {
6168         struct nfs4_client *clp = lst->st_stid.sc_client;
6169         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6170                                           nfsd_net_id);
6171
6172         if (!collect)
6173                 return;
6174
6175         lockdep_assert_held(&nn->client_lock);
6176         atomic_inc(&clp->cl_refcount);
6177         list_add(&lst->st_locks, collect);
6178 }
6179
6180 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
6181                                     struct list_head *collect,
6182                                     bool (*func)(struct nfs4_ol_stateid *))
6183 {
6184         struct nfs4_openowner *oop;
6185         struct nfs4_ol_stateid *stp, *st_next;
6186         struct nfs4_ol_stateid *lst, *lst_next;
6187         u64 count = 0;
6188
6189         spin_lock(&clp->cl_lock);
6190         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
6191                 list_for_each_entry_safe(stp, st_next,
6192                                 &oop->oo_owner.so_stateids, st_perstateowner) {
6193                         list_for_each_entry_safe(lst, lst_next,
6194                                         &stp->st_locks, st_locks) {
6195                                 if (func) {
6196                                         if (func(lst))
6197                                                 nfsd_inject_add_lock_to_list(lst,
6198                                                                         collect);
6199                                 }
6200                                 ++count;
6201                                 /*
6202                                  * Despite the fact that these functions deal
6203                                  * with 64-bit integers for "count", we must
6204                                  * ensure that it doesn't blow up the
6205                                  * clp->cl_refcount. Throw a warning if we
6206                                  * start to approach INT_MAX here.
6207                                  */
6208                                 WARN_ON_ONCE(count == (INT_MAX / 2));
6209                                 if (count == max)
6210                                         goto out;
6211                         }
6212                 }
6213         }
6214 out:
6215         spin_unlock(&clp->cl_lock);
6216
6217         return count;
6218 }
6219
6220 static u64
6221 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
6222                           u64 max)
6223 {
6224         return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
6225 }
6226
6227 static u64
6228 nfsd_print_client_locks(struct nfs4_client *clp)
6229 {
6230         u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
6231         nfsd_print_count(clp, count, "locked files");
6232         return count;
6233 }
6234
6235 u64
6236 nfsd_inject_print_locks(void)
6237 {
6238         struct nfs4_client *clp;
6239         u64 count = 0;
6240         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6241                                                 nfsd_net_id);
6242
6243         if (!nfsd_netns_ready(nn))
6244                 return 0;
6245
6246         spin_lock(&nn->client_lock);
6247         list_for_each_entry(clp, &nn->client_lru, cl_lru)
6248                 count += nfsd_print_client_locks(clp);
6249         spin_unlock(&nn->client_lock);
6250
6251         return count;
6252 }
6253
6254 static void
6255 nfsd_reap_locks(struct list_head *reaplist)
6256 {
6257         struct nfs4_client *clp;
6258         struct nfs4_ol_stateid *stp, *next;
6259
6260         list_for_each_entry_safe(stp, next, reaplist, st_locks) {
6261                 list_del_init(&stp->st_locks);
6262                 clp = stp->st_stid.sc_client;
6263                 nfs4_put_stid(&stp->st_stid);
6264                 put_client(clp);
6265         }
6266 }
6267
6268 u64
6269 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
6270 {
6271         unsigned int count = 0;
6272         struct nfs4_client *clp;
6273         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6274                                                 nfsd_net_id);
6275         LIST_HEAD(reaplist);
6276
6277         if (!nfsd_netns_ready(nn))
6278                 return count;
6279
6280         spin_lock(&nn->client_lock);
6281         clp = nfsd_find_client(addr, addr_size);
6282         if (clp)
6283                 count = nfsd_collect_client_locks(clp, &reaplist, 0);
6284         spin_unlock(&nn->client_lock);
6285         nfsd_reap_locks(&reaplist);
6286         return count;
6287 }
6288
6289 u64
6290 nfsd_inject_forget_locks(u64 max)
6291 {
6292         u64 count = 0;
6293         struct nfs4_client *clp;
6294         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6295                                                 nfsd_net_id);
6296         LIST_HEAD(reaplist);
6297
6298         if (!nfsd_netns_ready(nn))
6299                 return count;
6300
6301         spin_lock(&nn->client_lock);
6302         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6303                 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
6304                 if (max != 0 && count >= max)
6305                         break;
6306         }
6307         spin_unlock(&nn->client_lock);
6308         nfsd_reap_locks(&reaplist);
6309         return count;
6310 }
6311
6312 static u64
6313 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
6314                               struct list_head *collect,
6315                               void (*func)(struct nfs4_openowner *))
6316 {
6317         struct nfs4_openowner *oop, *next;
6318         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6319                                                 nfsd_net_id);
6320         u64 count = 0;
6321
6322         lockdep_assert_held(&nn->client_lock);
6323
6324         spin_lock(&clp->cl_lock);
6325         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
6326                 if (func) {
6327                         func(oop);
6328                         if (collect) {
6329                                 atomic_inc(&clp->cl_refcount);
6330                                 list_add(&oop->oo_perclient, collect);
6331                         }
6332                 }
6333                 ++count;
6334                 /*
6335                  * Despite the fact that these functions deal with
6336                  * 64-bit integers for "count", we must ensure that
6337                  * it doesn't blow up the clp->cl_refcount. Throw a
6338                  * warning if we start to approach INT_MAX here.
6339                  */
6340                 WARN_ON_ONCE(count == (INT_MAX / 2));
6341                 if (count == max)
6342                         break;
6343         }
6344         spin_unlock(&clp->cl_lock);
6345
6346         return count;
6347 }
6348
6349 static u64
6350 nfsd_print_client_openowners(struct nfs4_client *clp)
6351 {
6352         u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
6353
6354         nfsd_print_count(clp, count, "openowners");
6355         return count;
6356 }
6357
6358 static u64
6359 nfsd_collect_client_openowners(struct nfs4_client *clp,
6360                                struct list_head *collect, u64 max)
6361 {
6362         return nfsd_foreach_client_openowner(clp, max, collect,
6363                                                 unhash_openowner_locked);
6364 }
6365
6366 u64
6367 nfsd_inject_print_openowners(void)
6368 {
6369         struct nfs4_client *clp;
6370         u64 count = 0;
6371         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6372                                                 nfsd_net_id);
6373
6374         if (!nfsd_netns_ready(nn))
6375                 return 0;
6376
6377         spin_lock(&nn->client_lock);
6378         list_for_each_entry(clp, &nn->client_lru, cl_lru)
6379                 count += nfsd_print_client_openowners(clp);
6380         spin_unlock(&nn->client_lock);
6381
6382         return count;
6383 }
6384
6385 static void
6386 nfsd_reap_openowners(struct list_head *reaplist)
6387 {
6388         struct nfs4_client *clp;
6389         struct nfs4_openowner *oop, *next;
6390
6391         list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
6392                 list_del_init(&oop->oo_perclient);
6393                 clp = oop->oo_owner.so_client;
6394                 release_openowner(oop);
6395                 put_client(clp);
6396         }
6397 }
6398
6399 u64
6400 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
6401                                      size_t addr_size)
6402 {
6403         unsigned int count = 0;
6404         struct nfs4_client *clp;
6405         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6406                                                 nfsd_net_id);
6407         LIST_HEAD(reaplist);
6408
6409         if (!nfsd_netns_ready(nn))
6410                 return count;
6411
6412         spin_lock(&nn->client_lock);
6413         clp = nfsd_find_client(addr, addr_size);
6414         if (clp)
6415                 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
6416         spin_unlock(&nn->client_lock);
6417         nfsd_reap_openowners(&reaplist);
6418         return count;
6419 }
6420
6421 u64
6422 nfsd_inject_forget_openowners(u64 max)
6423 {
6424         u64 count = 0;
6425         struct nfs4_client *clp;
6426         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6427                                                 nfsd_net_id);
6428         LIST_HEAD(reaplist);
6429
6430         if (!nfsd_netns_ready(nn))
6431                 return count;
6432
6433         spin_lock(&nn->client_lock);
6434         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6435                 count += nfsd_collect_client_openowners(clp, &reaplist,
6436                                                         max - count);
6437                 if (max != 0 && count >= max)
6438                         break;
6439         }
6440         spin_unlock(&nn->client_lock);
6441         nfsd_reap_openowners(&reaplist);
6442         return count;
6443 }
6444
6445 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
6446                                      struct list_head *victims)
6447 {
6448         struct nfs4_delegation *dp, *next;
6449         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6450                                                 nfsd_net_id);
6451         u64 count = 0;
6452
6453         lockdep_assert_held(&nn->client_lock);
6454
6455         spin_lock(&state_lock);
6456         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
6457                 if (victims) {
6458                         /*
6459                          * It's not safe to mess with delegations that have a
6460                          * non-zero dl_time. They might have already been broken
6461                          * and could be processed by the laundromat outside of
6462                          * the state_lock. Just leave them be.
6463                          */
6464                         if (dp->dl_time != 0)
6465                                 continue;
6466
6467                         atomic_inc(&clp->cl_refcount);
6468                         WARN_ON(!unhash_delegation_locked(dp));
6469                         list_add(&dp->dl_recall_lru, victims);
6470                 }
6471                 ++count;
6472                 /*
6473                  * Despite the fact that these functions deal with
6474                  * 64-bit integers for "count", we must ensure that
6475                  * it doesn't blow up the clp->cl_refcount. Throw a
6476                  * warning if we start to approach INT_MAX here.
6477                  */
6478                 WARN_ON_ONCE(count == (INT_MAX / 2));
6479                 if (count == max)
6480                         break;
6481         }
6482         spin_unlock(&state_lock);
6483         return count;
6484 }
6485
6486 static u64
6487 nfsd_print_client_delegations(struct nfs4_client *clp)
6488 {
6489         u64 count = nfsd_find_all_delegations(clp, 0, NULL);
6490
6491         nfsd_print_count(clp, count, "delegations");
6492         return count;
6493 }
6494
6495 u64
6496 nfsd_inject_print_delegations(void)
6497 {
6498         struct nfs4_client *clp;
6499         u64 count = 0;
6500         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6501                                                 nfsd_net_id);
6502
6503         if (!nfsd_netns_ready(nn))
6504                 return 0;
6505
6506         spin_lock(&nn->client_lock);
6507         list_for_each_entry(clp, &nn->client_lru, cl_lru)
6508                 count += nfsd_print_client_delegations(clp);
6509         spin_unlock(&nn->client_lock);
6510
6511         return count;
6512 }
6513
6514 static void
6515 nfsd_forget_delegations(struct list_head *reaplist)
6516 {
6517         struct nfs4_client *clp;
6518         struct nfs4_delegation *dp, *next;
6519
6520         list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6521                 list_del_init(&dp->dl_recall_lru);
6522                 clp = dp->dl_stid.sc_client;
6523                 revoke_delegation(dp);
6524                 put_client(clp);
6525         }
6526 }
6527
6528 u64
6529 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
6530                                       size_t addr_size)
6531 {
6532         u64 count = 0;
6533         struct nfs4_client *clp;
6534         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6535                                                 nfsd_net_id);
6536         LIST_HEAD(reaplist);
6537
6538         if (!nfsd_netns_ready(nn))
6539                 return count;
6540
6541         spin_lock(&nn->client_lock);
6542         clp = nfsd_find_client(addr, addr_size);
6543         if (clp)
6544                 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6545         spin_unlock(&nn->client_lock);
6546
6547         nfsd_forget_delegations(&reaplist);
6548         return count;
6549 }
6550
6551 u64
6552 nfsd_inject_forget_delegations(u64 max)
6553 {
6554         u64 count = 0;
6555         struct nfs4_client *clp;
6556         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6557                                                 nfsd_net_id);
6558         LIST_HEAD(reaplist);
6559
6560         if (!nfsd_netns_ready(nn))
6561                 return count;
6562
6563         spin_lock(&nn->client_lock);
6564         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6565                 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6566                 if (max != 0 && count >= max)
6567                         break;
6568         }
6569         spin_unlock(&nn->client_lock);
6570         nfsd_forget_delegations(&reaplist);
6571         return count;
6572 }
6573
6574 static void
6575 nfsd_recall_delegations(struct list_head *reaplist)
6576 {
6577         struct nfs4_client *clp;
6578         struct nfs4_delegation *dp, *next;
6579
6580         list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6581                 list_del_init(&dp->dl_recall_lru);
6582                 clp = dp->dl_stid.sc_client;
6583                 /*
6584                  * We skipped all entries that had a zero dl_time before,
6585                  * so we can now reset the dl_time back to 0. If a delegation
6586                  * break comes in now, then it won't make any difference since
6587                  * we're recalling it either way.
6588                  */
6589                 spin_lock(&state_lock);
6590                 dp->dl_time = 0;
6591                 spin_unlock(&state_lock);
6592                 nfsd_break_one_deleg(dp);
6593                 put_client(clp);
6594         }
6595 }
6596
6597 u64
6598 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
6599                                       size_t addr_size)
6600 {
6601         u64 count = 0;
6602         struct nfs4_client *clp;
6603         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6604                                                 nfsd_net_id);
6605         LIST_HEAD(reaplist);
6606
6607         if (!nfsd_netns_ready(nn))
6608                 return count;
6609
6610         spin_lock(&nn->client_lock);
6611         clp = nfsd_find_client(addr, addr_size);
6612         if (clp)
6613                 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6614         spin_unlock(&nn->client_lock);
6615
6616         nfsd_recall_delegations(&reaplist);
6617         return count;
6618 }
6619
6620 u64
6621 nfsd_inject_recall_delegations(u64 max)
6622 {
6623         u64 count = 0;
6624         struct nfs4_client *clp, *next;
6625         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6626                                                 nfsd_net_id);
6627         LIST_HEAD(reaplist);
6628
6629         if (!nfsd_netns_ready(nn))
6630                 return count;
6631
6632         spin_lock(&nn->client_lock);
6633         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6634                 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6635                 if (max != 0 && ++count >= max)
6636                         break;
6637         }
6638         spin_unlock(&nn->client_lock);
6639         nfsd_recall_delegations(&reaplist);
6640         return count;
6641 }
6642 #endif /* CONFIG_NFSD_FAULT_INJECTION */
6643
6644 /*
6645  * Since the lifetime of a delegation isn't limited to that of an open, a
6646  * client may quite reasonably hang on to a delegation as long as it has
6647  * the inode cached.  This becomes an obvious problem the first time a
6648  * client's inode cache approaches the size of the server's total memory.
6649  *
6650  * For now we avoid this problem by imposing a hard limit on the number
6651  * of delegations, which varies according to the server's memory size.
6652  */
6653 static void
6654 set_max_delegations(void)
6655 {
6656         /*
6657          * Allow at most 4 delegations per megabyte of RAM.  Quick
6658          * estimates suggest that in the worst case (where every delegation
6659          * is for a different inode), a delegation could take about 1.5K,
6660          * giving a worst case usage of about 6% of memory.
6661          */
6662         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
6663 }
6664
6665 static int nfs4_state_create_net(struct net *net)
6666 {
6667         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6668         int i;
6669
6670         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
6671                         CLIENT_HASH_SIZE, GFP_KERNEL);
6672         if (!nn->conf_id_hashtbl)
6673                 goto err;
6674         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
6675                         CLIENT_HASH_SIZE, GFP_KERNEL);
6676         if (!nn->unconf_id_hashtbl)
6677                 goto err_unconf_id;
6678         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
6679                         SESSION_HASH_SIZE, GFP_KERNEL);
6680         if (!nn->sessionid_hashtbl)
6681                 goto err_sessionid;
6682
6683         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6684                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
6685                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
6686         }
6687         for (i = 0; i < SESSION_HASH_SIZE; i++)
6688                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
6689         nn->conf_name_tree = RB_ROOT;
6690         nn->unconf_name_tree = RB_ROOT;
6691         INIT_LIST_HEAD(&nn->client_lru);
6692         INIT_LIST_HEAD(&nn->close_lru);
6693         INIT_LIST_HEAD(&nn->del_recall_lru);
6694         spin_lock_init(&nn->client_lock);
6695
6696         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
6697         get_net(net);
6698
6699         return 0;
6700
6701 err_sessionid:
6702         kfree(nn->unconf_id_hashtbl);
6703 err_unconf_id:
6704         kfree(nn->conf_id_hashtbl);
6705 err:
6706         return -ENOMEM;
6707 }
6708
6709 static void
6710 nfs4_state_destroy_net(struct net *net)
6711 {
6712         int i;
6713         struct nfs4_client *clp = NULL;
6714         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6715
6716         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6717                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
6718                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
6719                         destroy_client(clp);
6720                 }
6721         }
6722
6723         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6724                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
6725                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
6726                         destroy_client(clp);
6727                 }
6728         }
6729
6730         kfree(nn->sessionid_hashtbl);
6731         kfree(nn->unconf_id_hashtbl);
6732         kfree(nn->conf_id_hashtbl);
6733         put_net(net);
6734 }
6735
6736 int
6737 nfs4_state_start_net(struct net *net)
6738 {
6739         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6740         int ret;
6741
6742         ret = nfs4_state_create_net(net);
6743         if (ret)
6744                 return ret;
6745         nn->boot_time = get_seconds();
6746         nn->grace_ended = false;
6747         nn->nfsd4_manager.block_opens = true;
6748         locks_start_grace(net, &nn->nfsd4_manager);
6749         nfsd4_client_tracking_init(net);
6750         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
6751                nn->nfsd4_grace, net);
6752         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
6753         return 0;
6754 }
6755
6756 /* initialization to perform when the nfsd service is started: */
6757
6758 int
6759 nfs4_state_start(void)
6760 {
6761         int ret;
6762
6763         ret = set_callback_cred();
6764         if (ret)
6765                 return -ENOMEM;
6766         laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
6767         if (laundry_wq == NULL) {
6768                 ret = -ENOMEM;
6769                 goto out_recovery;
6770         }
6771         ret = nfsd4_create_callback_queue();
6772         if (ret)
6773                 goto out_free_laundry;
6774
6775         set_max_delegations();
6776
6777         return 0;
6778
6779 out_free_laundry:
6780         destroy_workqueue(laundry_wq);
6781 out_recovery:
6782         return ret;
6783 }
6784
6785 void
6786 nfs4_state_shutdown_net(struct net *net)
6787 {
6788         struct nfs4_delegation *dp = NULL;
6789         struct list_head *pos, *next, reaplist;
6790         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6791
6792         cancel_delayed_work_sync(&nn->laundromat_work);
6793         locks_end_grace(&nn->nfsd4_manager);
6794
6795         INIT_LIST_HEAD(&reaplist);
6796         spin_lock(&state_lock);
6797         list_for_each_safe(pos, next, &nn->del_recall_lru) {
6798                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6799                 WARN_ON(!unhash_delegation_locked(dp));
6800                 list_add(&dp->dl_recall_lru, &reaplist);
6801         }
6802         spin_unlock(&state_lock);
6803         list_for_each_safe(pos, next, &reaplist) {
6804                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6805                 list_del_init(&dp->dl_recall_lru);
6806                 put_clnt_odstate(dp->dl_clnt_odstate);
6807                 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
6808                 nfs4_put_stid(&dp->dl_stid);
6809         }
6810
6811         nfsd4_client_tracking_exit(net);
6812         nfs4_state_destroy_net(net);
6813 }
6814
6815 void
6816 nfs4_state_shutdown(void)
6817 {
6818         destroy_workqueue(laundry_wq);
6819         nfsd4_destroy_callback_queue();
6820 }
6821
6822 static void
6823 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
6824 {
6825         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
6826                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
6827 }
6828
6829 static void
6830 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
6831 {
6832         if (cstate->minorversion) {
6833                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
6834                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
6835         }
6836 }
6837
6838 void
6839 clear_current_stateid(struct nfsd4_compound_state *cstate)
6840 {
6841         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
6842 }
6843
6844 /*
6845  * functions to set current state id
6846  */
6847 void
6848 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
6849 {
6850         put_stateid(cstate, &odp->od_stateid);
6851 }
6852
6853 void
6854 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
6855 {
6856         put_stateid(cstate, &open->op_stateid);
6857 }
6858
6859 void
6860 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
6861 {
6862         put_stateid(cstate, &close->cl_stateid);
6863 }
6864
6865 void
6866 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
6867 {
6868         put_stateid(cstate, &lock->lk_resp_stateid);
6869 }
6870
6871 /*
6872  * functions to consume current state id
6873  */
6874
6875 void
6876 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
6877 {
6878         get_stateid(cstate, &odp->od_stateid);
6879 }
6880
6881 void
6882 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
6883 {
6884         get_stateid(cstate, &drp->dr_stateid);
6885 }
6886
6887 void
6888 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
6889 {
6890         get_stateid(cstate, &fsp->fr_stateid);
6891 }
6892
6893 void
6894 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
6895 {
6896         get_stateid(cstate, &setattr->sa_stateid);
6897 }
6898
6899 void
6900 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
6901 {
6902         get_stateid(cstate, &close->cl_stateid);
6903 }
6904
6905 void
6906 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
6907 {
6908         get_stateid(cstate, &locku->lu_stateid);
6909 }
6910
6911 void
6912 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
6913 {
6914         get_stateid(cstate, &read->rd_stateid);
6915 }
6916
6917 void
6918 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
6919 {
6920         get_stateid(cstate, &write->wr_stateid);
6921 }