fs/nfsd/nfs4state.c

   1 /*
   2 *  Copyright (c) 2001 The Regents of the University of Michigan.
   3 *  All rights reserved.
   4 *
   5 *  Kendrick Smith <kmsmith@umich.edu>
   6 *  Andy Adamson <kandros@umich.edu>
   7 *
   8 *  Redistribution and use in source and binary forms, with or without
   9 *  modification, are permitted provided that the following conditions
  10 *  are met:
  11 *
  12 *  1. Redistributions of source code must retain the above copyright
  13 *     notice, this list of conditions and the following disclaimer.
  14 *  2. Redistributions in binary form must reproduce the above copyright
  15 *     notice, this list of conditions and the following disclaimer in the
  16 *     documentation and/or other materials provided with the distribution.
  17 *  3. Neither the name of the University nor the names of its
  18 *     contributors may be used to endorse or promote products derived
  19 *     from this software without specific prior written permission.
  20 *
  21 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32 *
  33 */
  34
  35 #include <linux/file.h>
  36 #include <linux/fs.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/swap.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/ratelimit.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43 #include <linux/sunrpc/addr.h>
  44 #include <linux/hash.h>
  45 #include "xdr4.h"
  46 #include "xdr4cb.h"
  47 #include "vfs.h"
  48 #include "current_stateid.h"
  49
  50 #include "netns.h"
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 #define all_ones {{~0,~0},~0}
  55 static const stateid_t one_stateid = {
  56         .si_generation = ~0,
  57         .si_opaque = all_ones,
  58 };
  59 static const stateid_t zero_stateid = {
  60         /* all fields zero */
  61 };
  62 static const stateid_t currentstateid = {
  63         .si_generation = 1,
  64 };
  65
  66 static u64 current_sessionid = 1;
  67
  68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  70 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  71
  72 /* forward declarations */
  73 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  74
  75 /* Locking: */
  76
  77 /* Currently used for almost all code touching nfsv4 state: */
  78 static DEFINE_MUTEX(client_mutex);
  79
  80 /*
  81  * Currently used for the del_recall_lru and file hash table.  In an
  82  * effort to decrease the scope of the client_mutex, this spinlock may
  83  * eventually cover more:
  84  */
  85 static DEFINE_SPINLOCK(state_lock);
  86
  87 static struct kmem_cache *openowner_slab;
  88 static struct kmem_cache *lockowner_slab;
  89 static struct kmem_cache *file_slab;
  90 static struct kmem_cache *stateid_slab;
  91 static struct kmem_cache *deleg_slab;
  92
  93 void
  94 nfs4_lock_state(void)
  95 {
  96         mutex_lock(&client_mutex);
  97 }
  98
  99 static void free_session(struct nfsd4_session *);
 100
 101 static bool is_session_dead(struct nfsd4_session *ses)
 102 {
 103         return ses->se_flags & NFS4_SESSION_DEAD;
 104 }
 105
 106 void nfsd4_put_session(struct nfsd4_session *ses)
 107 {
 108         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 109                 free_session(ses);
 110 }
 111
 112 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 113 {
 114         if (atomic_read(&ses->se_ref) > ref_held_by_me)
 115                 return nfserr_jukebox;
 116         ses->se_flags |= NFS4_SESSION_DEAD;
 117         return nfs_ok;
 118 }
 119
 120 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 121 {
 122         if (is_session_dead(ses))
 123                 return nfserr_badsession;
 124         atomic_inc(&ses->se_ref);
 125         return nfs_ok;
 126 }
 127
 128 void
 129 nfs4_unlock_state(void)
 130 {
 131         mutex_unlock(&client_mutex);
 132 }
 133
 134 static bool is_client_expired(struct nfs4_client *clp)
 135 {
 136         return clp->cl_time == 0;
 137 }
 138
 139 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
 140 {
 141         if (atomic_read(&clp->cl_refcount))
 142                 return nfserr_jukebox;
 143         clp->cl_time = 0;
 144         return nfs_ok;
 145 }
 146
 147 static __be32 mark_client_expired(struct nfs4_client *clp)
 148 {
 149         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 150         __be32 ret;
 151
 152         spin_lock(&nn->client_lock);
 153         ret = mark_client_expired_locked(clp);
 154         spin_unlock(&nn->client_lock);
 155         return ret;
 156 }
 157
 158 static __be32 get_client_locked(struct nfs4_client *clp)
 159 {
 160         if (is_client_expired(clp))
 161                 return nfserr_expired;
 162         atomic_inc(&clp->cl_refcount);
 163         return nfs_ok;
 164 }
 165
 166 /* must be called under the client_lock */
 167 static inline void
 168 renew_client_locked(struct nfs4_client *clp)
 169 {
 170         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 171
 172         if (is_client_expired(clp)) {
 173                 WARN_ON(1);
 174                 printk("%s: client (clientid %08x/%08x) already expired\n",
 175                         __func__,
 176                         clp->cl_clientid.cl_boot,
 177                         clp->cl_clientid.cl_id);
 178                 return;
 179         }
 180
 181         dprintk("renewing client (clientid %08x/%08x)\n",
 182                         clp->cl_clientid.cl_boot,
 183                         clp->cl_clientid.cl_id);
 184         list_move_tail(&clp->cl_lru, &nn->client_lru);
 185         clp->cl_time = get_seconds();
 186 }
 187
 188 static inline void
 189 renew_client(struct nfs4_client *clp)
 190 {
 191         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 192
 193         spin_lock(&nn->client_lock);
 194         renew_client_locked(clp);
 195         spin_unlock(&nn->client_lock);
 196 }
 197
 198 static void put_client_renew_locked(struct nfs4_client *clp)
 199 {
 200         if (!atomic_dec_and_test(&clp->cl_refcount))
 201                 return;
 202         if (!is_client_expired(clp))
 203                 renew_client_locked(clp);
 204 }
 205
 206 void put_client_renew(struct nfs4_client *clp)
 207 {
 208         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 209
 210         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
 211                 return;
 212         if (!is_client_expired(clp))
 213                 renew_client_locked(clp);
 214         spin_unlock(&nn->client_lock);
 215 }
 216
 217
 218 static inline u32
 219 opaque_hashval(const void *ptr, int nbytes)
 220 {
 221         unsigned char *cptr = (unsigned char *) ptr;
 222
 223         u32 x = 0;
 224         while (nbytes--) {
 225                 x *= 37;
 226                 x += *cptr++;
 227         }
 228         return x;
 229 }
 230
 231 static void nfsd4_free_file(struct nfs4_file *f)
 232 {
 233         kmem_cache_free(file_slab, f);
 234 }
 235
 236 static inline void
 237 put_nfs4_file(struct nfs4_file *fi)
 238 {
 239         if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
 240                 hlist_del(&fi->fi_hash);
 241                 spin_unlock(&state_lock);
 242                 iput(fi->fi_inode);
 243                 nfsd4_free_file(fi);
 244         }
 245 }
 246
 247 static inline void
 248 get_nfs4_file(struct nfs4_file *fi)
 249 {
 250         atomic_inc(&fi->fi_ref);
 251 }
 252
 253 static int num_delegations;
 254 unsigned long max_delegations;
 255
 256 /*
 257  * Open owner state (share locks)
 258  */
 259
 260 /* hash tables for lock and open owners */
 261 #define OWNER_HASH_BITS              8
 262 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 263 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 264
 265 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 266 {
 267         unsigned int ret;
 268
 269         ret = opaque_hashval(ownername->data, ownername->len);
 270         ret += clientid;
 271         return ret & OWNER_HASH_MASK;
 272 }
 273
 274 /* hash table for nfs4_file */
 275 #define FILE_HASH_BITS                   8
 276 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 277
 278 static unsigned int file_hashval(struct inode *ino)
 279 {
 280         /* XXX: why are we hashing on inode pointer, anyway? */
 281         return hash_ptr(ino, FILE_HASH_BITS);
 282 }
 283
 284 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 285
 286 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 287 {
 288         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 289         atomic_inc(&fp->fi_access[oflag]);
 290 }
 291
 292 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 293 {
 294         if (oflag == O_RDWR) {
 295                 __nfs4_file_get_access(fp, O_RDONLY);
 296                 __nfs4_file_get_access(fp, O_WRONLY);
 297         } else
 298                 __nfs4_file_get_access(fp, oflag);
 299 }
 300
 301 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 302 {
 303         if (fp->fi_fds[oflag]) {
 304                 fput(fp->fi_fds[oflag]);
 305                 fp->fi_fds[oflag] = NULL;
 306         }
 307 }
 308
 309 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 310 {
 311         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 312                 nfs4_file_put_fd(fp, oflag);
 313                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 314                         nfs4_file_put_fd(fp, O_RDWR);
 315         }
 316 }
 317
 318 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 319 {
 320         if (oflag == O_RDWR) {
 321                 __nfs4_file_put_access(fp, O_RDONLY);
 322                 __nfs4_file_put_access(fp, O_WRONLY);
 323         } else
 324                 __nfs4_file_put_access(fp, oflag);
 325 }
 326
 327 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
 328 kmem_cache *slab)
 329 {
 330         struct idr *stateids = &cl->cl_stateids;
 331         struct nfs4_stid *stid;
 332         int new_id;
 333
 334         stid = kmem_cache_alloc(slab, GFP_KERNEL);
 335         if (!stid)
 336                 return NULL;
 337
 338         new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
 339         if (new_id < 0)
 340                 goto out_free;
 341         stid->sc_client = cl;
 342         stid->sc_type = 0;
 343         stid->sc_stateid.si_opaque.so_id = new_id;
 344         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 345         /* Will be incremented before return to client: */
 346         stid->sc_stateid.si_generation = 0;
 347
 348         /*
 349          * It shouldn't be a problem to reuse an opaque stateid value.
 350          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 351          * example, a stray write retransmission could be accepted by
 352          * the server when it should have been rejected.  Therefore,
 353          * adopt a trick from the sctp code to attempt to maximize the
 354          * amount of time until an id is reused, by ensuring they always
 355          * "increase" (mod INT_MAX):
 356          */
 357         return stid;
 358 out_free:
 359         kmem_cache_free(slab, stid);
 360         return NULL;
 361 }
 362
 363 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 364 {
 365         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 366 }
 367
 368 /*
 369  * When we recall a delegation, we should be careful not to hand it
 370  * out again straight away.
 371  * To ensure this we keep a pair of bloom filters ('new' and 'old')
 372  * in which the filehandles of recalled delegations are "stored".
 373  * If a filehandle appear in either filter, a delegation is blocked.
 374  * When a delegation is recalled, the filehandle is stored in the "new"
 375  * filter.
 376  * Every 30 seconds we swap the filters and clear the "new" one,
 377  * unless both are empty of course.
 378  *
 379  * Each filter is 256 bits.  We hash the filehandle to 32bit and use the
 380  * low 3 bytes as hash-table indices.
 381  *
 382  * 'state_lock', which is always held when block_delegations() is called,
 383  * is used to manage concurrent access.  Testing does not need the lock
 384  * except when swapping the two filters.
 385  */
 386 static struct bloom_pair {
 387         int     entries, old_entries;
 388         time_t  swap_time;
 389         int     new; /* index into 'set' */
 390         DECLARE_BITMAP(set[2], 256);
 391 } blocked_delegations;
 392
 393 static int delegation_blocked(struct knfsd_fh *fh)
 394 {
 395         u32 hash;
 396         struct bloom_pair *bd = &blocked_delegations;
 397
 398         if (bd->entries == 0)
 399                 return 0;
 400         if (seconds_since_boot() - bd->swap_time > 30) {
 401                 spin_lock(&state_lock);
 402                 if (seconds_since_boot() - bd->swap_time > 30) {
 403                         bd->entries -= bd->old_entries;
 404                         bd->old_entries = bd->entries;
 405                         memset(bd->set[bd->new], 0,
 406                                sizeof(bd->set[0]));
 407                         bd->new = 1-bd->new;
 408                         bd->swap_time = seconds_since_boot();
 409                 }
 410                 spin_unlock(&state_lock);
 411         }
 412         hash = arch_fast_hash(&fh->fh_base, fh->fh_size, 0);
 413         if (test_bit(hash&255, bd->set[0]) &&
 414             test_bit((hash>>8)&255, bd->set[0]) &&
 415             test_bit((hash>>16)&255, bd->set[0]))
 416                 return 1;
 417
 418         if (test_bit(hash&255, bd->set[1]) &&
 419             test_bit((hash>>8)&255, bd->set[1]) &&
 420             test_bit((hash>>16)&255, bd->set[1]))
 421                 return 1;
 422
 423         return 0;
 424 }
 425
 426 static void block_delegations(struct knfsd_fh *fh)
 427 {
 428         u32 hash;
 429         struct bloom_pair *bd = &blocked_delegations;
 430
 431         hash = arch_fast_hash(&fh->fh_base, fh->fh_size, 0);
 432
 433         __set_bit(hash&255, bd->set[bd->new]);
 434         __set_bit((hash>>8)&255, bd->set[bd->new]);
 435         __set_bit((hash>>16)&255, bd->set[bd->new]);
 436         if (bd->entries == 0)
 437                 bd->swap_time = seconds_since_boot();
 438         bd->entries += 1;
 439 }
 440
 441 static struct nfs4_delegation *
 442 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
 443 {
 444         struct nfs4_delegation *dp;
 445
 446         dprintk("NFSD alloc_init_deleg\n");
 447         if (num_delegations > max_delegations)
 448                 return NULL;
 449         if (delegation_blocked(&current_fh->fh_handle))
 450                 return NULL;
 451         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 452         if (dp == NULL)
 453                 return dp;
 454         /*
 455          * delegation seqid's are never incremented.  The 4.1 special
 456          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 457          * 0 anyway just for consistency and use 1:
 458          */
 459         dp->dl_stid.sc_stateid.si_generation = 1;
 460         num_delegations++;
 461         INIT_LIST_HEAD(&dp->dl_perfile);
 462         INIT_LIST_HEAD(&dp->dl_perclnt);
 463         INIT_LIST_HEAD(&dp->dl_recall_lru);
 464         dp->dl_file = NULL;
 465         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
 466         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 467         dp->dl_time = 0;
 468         atomic_set(&dp->dl_count, 1);
 469         nfsd4_init_callback(&dp->dl_recall);
 470         return dp;
 471 }
 472
 473 static void remove_stid(struct nfs4_stid *s)
 474 {
 475         struct idr *stateids = &s->sc_client->cl_stateids;
 476
 477         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 478 }
 479
 480 static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
 481 {
 482         kmem_cache_free(slab, s);
 483 }
 484
 485 void
 486 nfs4_put_delegation(struct nfs4_delegation *dp)
 487 {
 488         if (atomic_dec_and_test(&dp->dl_count)) {
 489                 nfs4_free_stid(deleg_slab, &dp->dl_stid);
 490                 num_delegations--;
 491         }
 492 }
 493
 494 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 495 {
 496         if (!fp->fi_lease)
 497                 return;
 498         if (atomic_dec_and_test(&fp->fi_delegees)) {
 499                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 500                 fp->fi_lease = NULL;
 501                 fput(fp->fi_deleg_file);
 502                 fp->fi_deleg_file = NULL;
 503         }
 504 }
 505
 506 static void unhash_stid(struct nfs4_stid *s)
 507 {
 508         s->sc_type = 0;
 509 }
 510
 511 static void
 512 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 513 {
 514         lockdep_assert_held(&state_lock);
 515
 516         dp->dl_stid.sc_type = NFS4_DELEG_STID;
 517         list_add(&dp->dl_perfile, &fp->fi_delegations);
 518         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
 519 }
 520
 521 /* Called under the state lock. */
 522 static void
 523 unhash_delegation(struct nfs4_delegation *dp)
 524 {
 525         spin_lock(&state_lock);
 526         list_del_init(&dp->dl_perclnt);
 527         list_del_init(&dp->dl_perfile);
 528         list_del_init(&dp->dl_recall_lru);
 529         spin_unlock(&state_lock);
 530         if (dp->dl_file) {
 531                 nfs4_put_deleg_lease(dp->dl_file);
 532                 put_nfs4_file(dp->dl_file);
 533                 dp->dl_file = NULL;
 534         }
 535 }
 536
 537
 538
 539 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
 540 {
 541         list_del_init(&dp->dl_recall_lru);
 542         remove_stid(&dp->dl_stid);
 543         nfs4_put_delegation(dp);
 544 }
 545
 546 static void destroy_delegation(struct nfs4_delegation *dp)
 547 {
 548         unhash_delegation(dp);
 549         remove_stid(&dp->dl_stid);
 550         nfs4_put_delegation(dp);
 551 }
 552
 553 static void revoke_delegation(struct nfs4_delegation *dp)
 554 {
 555         struct nfs4_client *clp = dp->dl_stid.sc_client;
 556
 557         if (clp->cl_minorversion == 0)
 558                 destroy_delegation(dp);
 559         else {
 560                 unhash_delegation(dp);
 561                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
 562                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
 563         }
 564 }
 565
 566 /*
 567  * SETCLIENTID state
 568  */
 569
 570 static unsigned int clientid_hashval(u32 id)
 571 {
 572         return id & CLIENT_HASH_MASK;
 573 }
 574
 575 static unsigned int clientstr_hashval(const char *name)
 576 {
 577         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 578 }
 579
 580 /*
 581  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 582  * st_{access,deny}_bmap field of the stateid, in order to track not
 583  * only what share bits are currently in force, but also what
 584  * combinations of share bits previous opens have used.  This allows us
 585  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 586  * return an error if the client attempt to downgrade to a combination
 587  * of share bits not explicable by closing some of its previous opens.
 588  *
 589  * XXX: This enforcement is actually incomplete, since we don't keep
 590  * track of access/deny bit combinations; so, e.g., we allow:
 591  *
 592  *      OPEN allow read, deny write
 593  *      OPEN allow both, deny none
 594  *      DOWNGRADE allow read, deny none
 595  *
 596  * which we should reject.
 597  */
 598 static unsigned int
 599 bmap_to_share_mode(unsigned long bmap) {
 600         int i;
 601         unsigned int access = 0;
 602
 603         for (i = 1; i < 4; i++) {
 604                 if (test_bit(i, &bmap))
 605                         access |= i;
 606         }
 607         return access;
 608 }
 609
 610 static bool
 611 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 612         unsigned int access, deny;
 613
 614         access = bmap_to_share_mode(stp->st_access_bmap);
 615         deny = bmap_to_share_mode(stp->st_deny_bmap);
 616         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 617                 return false;
 618         return true;
 619 }
 620
 621 /* set share access for a given stateid */
 622 static inline void
 623 set_access(u32 access, struct nfs4_ol_stateid *stp)
 624 {
 625         __set_bit(access, &stp->st_access_bmap);
 626 }
 627
 628 /* clear share access for a given stateid */
 629 static inline void
 630 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 631 {
 632         __clear_bit(access, &stp->st_access_bmap);
 633 }
 634
 635 /* test whether a given stateid has access */
 636 static inline bool
 637 test_access(u32 access, struct nfs4_ol_stateid *stp)
 638 {
 639         return test_bit(access, &stp->st_access_bmap);
 640 }
 641
 642 /* set share deny for a given stateid */
 643 static inline void
 644 set_deny(u32 access, struct nfs4_ol_stateid *stp)
 645 {
 646         __set_bit(access, &stp->st_deny_bmap);
 647 }
 648
 649 /* clear share deny for a given stateid */
 650 static inline void
 651 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 652 {
 653         __clear_bit(access, &stp->st_deny_bmap);
 654 }
 655
 656 /* test whether a given stateid is denying specific access */
 657 static inline bool
 658 test_deny(u32 access, struct nfs4_ol_stateid *stp)
 659 {
 660         return test_bit(access, &stp->st_deny_bmap);
 661 }
 662
 663 static int nfs4_access_to_omode(u32 access)
 664 {
 665         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 666         case NFS4_SHARE_ACCESS_READ:
 667                 return O_RDONLY;
 668         case NFS4_SHARE_ACCESS_WRITE:
 669                 return O_WRONLY;
 670         case NFS4_SHARE_ACCESS_BOTH:
 671                 return O_RDWR;
 672         }
 673         WARN_ON_ONCE(1);
 674         return O_RDONLY;
 675 }
 676
 677 /* release all access and file references for a given stateid */
 678 static void
 679 release_all_access(struct nfs4_ol_stateid *stp)
 680 {
 681         int i;
 682
 683         for (i = 1; i < 4; i++) {
 684                 if (test_access(i, stp))
 685                         nfs4_file_put_access(stp->st_file,
 686                                              nfs4_access_to_omode(i));
 687                 clear_access(i, stp);
 688         }
 689 }
 690
 691 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 692 {
 693         list_del(&stp->st_perfile);
 694         list_del(&stp->st_perstateowner);
 695 }
 696
 697 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 698 {
 699         release_all_access(stp);
 700         put_nfs4_file(stp->st_file);
 701         stp->st_file = NULL;
 702 }
 703
 704 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 705 {
 706         remove_stid(&stp->st_stid);
 707         nfs4_free_stid(stateid_slab, &stp->st_stid);
 708 }
 709
 710 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 711 {
 712         struct file *file;
 713
 714         unhash_generic_stateid(stp);
 715         unhash_stid(&stp->st_stid);
 716         file = find_any_file(stp->st_file);
 717         if (file)
 718                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 719         close_generic_stateid(stp);
 720         free_generic_stateid(stp);
 721 }
 722
 723 static void unhash_lockowner(struct nfs4_lockowner *lo)
 724 {
 725         struct nfs4_ol_stateid *stp;
 726
 727         list_del(&lo->lo_owner.so_strhash);
 728         list_del(&lo->lo_perstateid);
 729         list_del(&lo->lo_owner_ino_hash);
 730         while (!list_empty(&lo->lo_owner.so_stateids)) {
 731                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 732                                 struct nfs4_ol_stateid, st_perstateowner);
 733                 release_lock_stateid(stp);
 734         }
 735 }
 736
 737 static void nfs4_free_lockowner(struct nfs4_lockowner *lo)
 738 {
 739         kfree(lo->lo_owner.so_owner.data);
 740         kmem_cache_free(lockowner_slab, lo);
 741 }
 742
 743 static void release_lockowner(struct nfs4_lockowner *lo)
 744 {
 745         unhash_lockowner(lo);
 746         nfs4_free_lockowner(lo);
 747 }
 748
 749 static void
 750 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 751 {
 752         struct nfs4_lockowner *lo;
 753
 754         while (!list_empty(&open_stp->st_lockowners)) {
 755                 lo = list_entry(open_stp->st_lockowners.next,
 756                                 struct nfs4_lockowner, lo_perstateid);
 757                 release_lockowner(lo);
 758         }
 759 }
 760
 761 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 762 {
 763         unhash_generic_stateid(stp);
 764         release_stateid_lockowners(stp);
 765         close_generic_stateid(stp);
 766 }
 767
 768 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 769 {
 770         unhash_open_stateid(stp);
 771         free_generic_stateid(stp);
 772 }
 773
 774 static void unhash_openowner(struct nfs4_openowner *oo)
 775 {
 776         struct nfs4_ol_stateid *stp;
 777
 778         list_del(&oo->oo_owner.so_strhash);
 779         list_del(&oo->oo_perclient);
 780         while (!list_empty(&oo->oo_owner.so_stateids)) {
 781                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 782                                 struct nfs4_ol_stateid, st_perstateowner);
 783                 release_open_stateid(stp);
 784         }
 785 }
 786
 787 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 788 {
 789         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 790
 791         if (s) {
 792                 free_generic_stateid(s);
 793                 oo->oo_last_closed_stid = NULL;
 794         }
 795 }
 796
 797 static void nfs4_free_openowner(struct nfs4_openowner *oo)
 798 {
 799         kfree(oo->oo_owner.so_owner.data);
 800         kmem_cache_free(openowner_slab, oo);
 801 }
 802
 803 static void release_openowner(struct nfs4_openowner *oo)
 804 {
 805         unhash_openowner(oo);
 806         list_del(&oo->oo_close_lru);
 807         release_last_closed_stateid(oo);
 808         nfs4_free_openowner(oo);
 809 }
 810
 811 static inline int
 812 hash_sessionid(struct nfs4_sessionid *sessionid)
 813 {
 814         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 815
 816         return sid->sequence % SESSION_HASH_SIZE;
 817 }
 818
 819 #ifdef NFSD_DEBUG
 820 static inline void
 821 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 822 {
 823         u32 *ptr = (u32 *)(&sessionid->data[0]);
 824         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 825 }
 826 #else
 827 static inline void
 828 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 829 {
 830 }
 831 #endif
 832
 833 /*
 834  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
 835  * won't be used for replay.
 836  */
 837 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
 838 {
 839         struct nfs4_stateowner *so = cstate->replay_owner;
 840
 841         if (nfserr == nfserr_replay_me)
 842                 return;
 843
 844         if (!seqid_mutating_err(ntohl(nfserr))) {
 845                 cstate->replay_owner = NULL;
 846                 return;
 847         }
 848         if (!so)
 849                 return;
 850         if (so->so_is_open_owner)
 851                 release_last_closed_stateid(openowner(so));
 852         so->so_seqid++;
 853         return;
 854 }
 855
 856 static void
 857 gen_sessionid(struct nfsd4_session *ses)
 858 {
 859         struct nfs4_client *clp = ses->se_client;
 860         struct nfsd4_sessionid *sid;
 861
 862         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 863         sid->clientid = clp->cl_clientid;
 864         sid->sequence = current_sessionid++;
 865         sid->reserved = 0;
 866 }
 867
 868 /*
 869  * The protocol defines ca_maxresponssize_cached to include the size of
 870  * the rpc header, but all we need to cache is the data starting after
 871  * the end of the initial SEQUENCE operation--the rest we regenerate
 872  * each time.  Therefore we can advertise a ca_maxresponssize_cached
 873  * value that is the number of bytes in our cache plus a few additional
 874  * bytes.  In order to stay on the safe side, and not promise more than
 875  * we can cache, those additional bytes must be the minimum possible: 24
 876  * bytes of rpc header (xid through accept state, with AUTH_NULL
 877  * verifier), 12 for the compound header (with zero-length tag), and 44
 878  * for the SEQUENCE op response:
 879  */
 880 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 881
 882 static void
 883 free_session_slots(struct nfsd4_session *ses)
 884 {
 885         int i;
 886
 887         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 888                 kfree(ses->se_slots[i]);
 889 }
 890
 891 /*
 892  * We don't actually need to cache the rpc and session headers, so we
 893  * can allocate a little less for each slot:
 894  */
 895 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
 896 {
 897         u32 size;
 898
 899         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
 900                 size = 0;
 901         else
 902                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 903         return size + sizeof(struct nfsd4_slot);
 904 }
 905
 906 /*
 907  * XXX: If we run out of reserved DRC memory we could (up to a point)
 908  * re-negotiate active sessions and reduce their slot usage to make
 909  * room for new connections. For now we just fail the create session.
 910  */
 911 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
 912 {
 913         u32 slotsize = slot_bytes(ca);
 914         u32 num = ca->maxreqs;
 915         int avail;
 916
 917         spin_lock(&nfsd_drc_lock);
 918         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
 919                     nfsd_drc_max_mem - nfsd_drc_mem_used);
 920         num = min_t(int, num, avail / slotsize);
 921         nfsd_drc_mem_used += num * slotsize;
 922         spin_unlock(&nfsd_drc_lock);
 923
 924         return num;
 925 }
 926
 927 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
 928 {
 929         int slotsize = slot_bytes(ca);
 930
 931         spin_lock(&nfsd_drc_lock);
 932         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
 933         spin_unlock(&nfsd_drc_lock);
 934 }
 935
 936 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
 937                                            struct nfsd4_channel_attrs *battrs)
 938 {
 939         int numslots = fattrs->maxreqs;
 940         int slotsize = slot_bytes(fattrs);
 941         struct nfsd4_session *new;
 942         int mem, i;
 943
 944         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 945                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
 946         mem = numslots * sizeof(struct nfsd4_slot *);
 947
 948         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 949         if (!new)
 950                 return NULL;
 951         /* allocate each struct nfsd4_slot and data cache in one piece */
 952         for (i = 0; i < numslots; i++) {
 953                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
 954                 if (!new->se_slots[i])
 955                         goto out_free;
 956         }
 957
 958         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
 959         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
 960
 961         return new;
 962 out_free:
 963         while (i--)
 964                 kfree(new->se_slots[i]);
 965         kfree(new);
 966         return NULL;
 967 }
 968
 969 static void free_conn(struct nfsd4_conn *c)
 970 {
 971         svc_xprt_put(c->cn_xprt);
 972         kfree(c);
 973 }
 974
 975 static void nfsd4_conn_lost(struct svc_xpt_user *u)
 976 {
 977         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 978         struct nfs4_client *clp = c->cn_session->se_client;
 979
 980         spin_lock(&clp->cl_lock);
 981         if (!list_empty(&c->cn_persession)) {
 982                 list_del(&c->cn_persession);
 983                 free_conn(c);
 984         }
 985         nfsd4_probe_callback(clp);
 986         spin_unlock(&clp->cl_lock);
 987 }
 988
 989 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 990 {
 991         struct nfsd4_conn *conn;
 992
 993         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 994         if (!conn)
 995                 return NULL;
 996         svc_xprt_get(rqstp->rq_xprt);
 997         conn->cn_xprt = rqstp->rq_xprt;
 998         conn->cn_flags = flags;
 999         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1000         return conn;
1001 }
1002
1003 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1004 {
1005         conn->cn_session = ses;
1006         list_add(&conn->cn_persession, &ses->se_conns);
1007 }
1008
1009 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1010 {
1011         struct nfs4_client *clp = ses->se_client;
1012
1013         spin_lock(&clp->cl_lock);
1014         __nfsd4_hash_conn(conn, ses);
1015         spin_unlock(&clp->cl_lock);
1016 }
1017
1018 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1019 {
1020         conn->cn_xpt_user.callback = nfsd4_conn_lost;
1021         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1022 }
1023
1024 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1025 {
1026         int ret;
1027
1028         nfsd4_hash_conn(conn, ses);
1029         ret = nfsd4_register_conn(conn);
1030         if (ret)
1031                 /* oops; xprt is already down: */
1032                 nfsd4_conn_lost(&conn->cn_xpt_user);
1033         if (conn->cn_flags & NFS4_CDFC4_BACK) {
1034                 /* callback channel may be back up */
1035                 nfsd4_probe_callback(ses->se_client);
1036         }
1037 }
1038
1039 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1040 {
1041         u32 dir = NFS4_CDFC4_FORE;
1042
1043         if (cses->flags & SESSION4_BACK_CHAN)
1044                 dir |= NFS4_CDFC4_BACK;
1045         return alloc_conn(rqstp, dir);
1046 }
1047
1048 /* must be called under client_lock */
1049 static void nfsd4_del_conns(struct nfsd4_session *s)
1050 {
1051         struct nfs4_client *clp = s->se_client;
1052         struct nfsd4_conn *c;
1053
1054         spin_lock(&clp->cl_lock);
1055         while (!list_empty(&s->se_conns)) {
1056                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1057                 list_del_init(&c->cn_persession);
1058                 spin_unlock(&clp->cl_lock);
1059
1060                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1061                 free_conn(c);
1062
1063                 spin_lock(&clp->cl_lock);
1064         }
1065         spin_unlock(&clp->cl_lock);
1066 }
1067
1068 static void __free_session(struct nfsd4_session *ses)
1069 {
1070         free_session_slots(ses);
1071         kfree(ses);
1072 }
1073
1074 static void free_session(struct nfsd4_session *ses)
1075 {
1076         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
1077
1078         lockdep_assert_held(&nn->client_lock);
1079         nfsd4_del_conns(ses);
1080         nfsd4_put_drc_mem(&ses->se_fchannel);
1081         __free_session(ses);
1082 }
1083
1084 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1085 {
1086         int idx;
1087         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1088
1089         new->se_client = clp;
1090         gen_sessionid(new);
1091
1092         INIT_LIST_HEAD(&new->se_conns);
1093
1094         new->se_cb_seq_nr = 1;
1095         new->se_flags = cses->flags;
1096         new->se_cb_prog = cses->callback_prog;
1097         new->se_cb_sec = cses->cb_sec;
1098         atomic_set(&new->se_ref, 0);
1099         idx = hash_sessionid(&new->se_sessionid);
1100         spin_lock(&nn->client_lock);
1101         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1102         spin_lock(&clp->cl_lock);
1103         list_add(&new->se_perclnt, &clp->cl_sessions);
1104         spin_unlock(&clp->cl_lock);
1105         spin_unlock(&nn->client_lock);
1106
1107         if (cses->flags & SESSION4_BACK_CHAN) {
1108                 struct sockaddr *sa = svc_addr(rqstp);
1109                 /*
1110                  * This is a little silly; with sessions there's no real
1111                  * use for the callback address.  Use the peer address
1112                  * as a reasonable default for now, but consider fixing
1113                  * the rpc client not to require an address in the
1114                  * future:
1115                  */
1116                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1117                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1118         }
1119 }
1120
1121 /* caller must hold client_lock */
1122 static struct nfsd4_session *
1123 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1124 {
1125         struct nfsd4_session *elem;
1126         int idx;
1127         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1128
1129         dump_sessionid(__func__, sessionid);
1130         idx = hash_sessionid(sessionid);
1131         /* Search in the appropriate list */
1132         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1133                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1134                             NFS4_MAX_SESSIONID_LEN)) {
1135                         return elem;
1136                 }
1137         }
1138
1139         dprintk("%s: session not found\n", __func__);
1140         return NULL;
1141 }
1142
1143 /* caller must hold client_lock */
1144 static void
1145 unhash_session(struct nfsd4_session *ses)
1146 {
1147         list_del(&ses->se_hash);
1148         spin_lock(&ses->se_client->cl_lock);
1149         list_del(&ses->se_perclnt);
1150         spin_unlock(&ses->se_client->cl_lock);
1151 }
1152
1153 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1154 static int
1155 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1156 {
1157         if (clid->cl_boot == nn->boot_time)
1158                 return 0;
1159         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1160                 clid->cl_boot, clid->cl_id, nn->boot_time);
1161         return 1;
1162 }
1163
1164 /*
1165  * XXX Should we use a slab cache ?
1166  * This type of memory management is somewhat inefficient, but we use it
1167  * anyway since SETCLIENTID is not a common operation.
1168  */
1169 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1170 {
1171         struct nfs4_client *clp;
1172
1173         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1174         if (clp == NULL)
1175                 return NULL;
1176         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1177         if (clp->cl_name.data == NULL) {
1178                 kfree(clp);
1179                 return NULL;
1180         }
1181         clp->cl_name.len = name.len;
1182         INIT_LIST_HEAD(&clp->cl_sessions);
1183         idr_init(&clp->cl_stateids);
1184         atomic_set(&clp->cl_refcount, 0);
1185         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1186         INIT_LIST_HEAD(&clp->cl_idhash);
1187         INIT_LIST_HEAD(&clp->cl_openowners);
1188         INIT_LIST_HEAD(&clp->cl_delegations);
1189         INIT_LIST_HEAD(&clp->cl_lru);
1190         INIT_LIST_HEAD(&clp->cl_callbacks);
1191         INIT_LIST_HEAD(&clp->cl_revoked);
1192         spin_lock_init(&clp->cl_lock);
1193         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1194         return clp;
1195 }
1196
1197 static void
1198 free_client(struct nfs4_client *clp)
1199 {
1200         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1201
1202         lockdep_assert_held(&nn->client_lock);
1203         while (!list_empty(&clp->cl_sessions)) {
1204                 struct nfsd4_session *ses;
1205                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1206                                 se_perclnt);
1207                 list_del(&ses->se_perclnt);
1208                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1209                 free_session(ses);
1210         }
1211         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1212         free_svc_cred(&clp->cl_cred);
1213         kfree(clp->cl_name.data);
1214         idr_destroy(&clp->cl_stateids);
1215         kfree(clp);
1216 }
1217
1218 /* must be called under the client_lock */
1219 static inline void
1220 unhash_client_locked(struct nfs4_client *clp)
1221 {
1222         struct nfsd4_session *ses;
1223
1224         list_del(&clp->cl_lru);
1225         spin_lock(&clp->cl_lock);
1226         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1227                 list_del_init(&ses->se_hash);
1228         spin_unlock(&clp->cl_lock);
1229 }
1230
1231 static void
1232 destroy_client(struct nfs4_client *clp)
1233 {
1234         struct nfs4_openowner *oo;
1235         struct nfs4_delegation *dp;
1236         struct list_head reaplist;
1237         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1238
1239         INIT_LIST_HEAD(&reaplist);
1240         spin_lock(&state_lock);
1241         while (!list_empty(&clp->cl_delegations)) {
1242                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1243                 list_del_init(&dp->dl_perclnt);
1244                 list_move(&dp->dl_recall_lru, &reaplist);
1245         }
1246         spin_unlock(&state_lock);
1247         while (!list_empty(&reaplist)) {
1248                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1249                 destroy_delegation(dp);
1250         }
1251         list_splice_init(&clp->cl_revoked, &reaplist);
1252         while (!list_empty(&reaplist)) {
1253                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1254                 destroy_revoked_delegation(dp);
1255         }
1256         while (!list_empty(&clp->cl_openowners)) {
1257                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1258                 release_openowner(oo);
1259         }
1260         nfsd4_shutdown_callback(clp);
1261         if (clp->cl_cb_conn.cb_xprt)
1262                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1263         list_del(&clp->cl_idhash);
1264         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1265                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1266         else
1267                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1268         spin_lock(&nn->client_lock);
1269         unhash_client_locked(clp);
1270         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1271         free_client(clp);
1272         spin_unlock(&nn->client_lock);
1273 }
1274
1275 static void expire_client(struct nfs4_client *clp)
1276 {
1277         nfsd4_client_record_remove(clp);
1278         destroy_client(clp);
1279 }
1280
1281 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1282 {
1283         memcpy(target->cl_verifier.data, source->data,
1284                         sizeof(target->cl_verifier.data));
1285 }
1286
1287 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1288 {
1289         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1290         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1291 }
1292
1293 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1294 {
1295         if (source->cr_principal) {
1296                 target->cr_principal =
1297                                 kstrdup(source->cr_principal, GFP_KERNEL);
1298                 if (target->cr_principal == NULL)
1299                         return -ENOMEM;
1300         } else
1301                 target->cr_principal = NULL;
1302         target->cr_flavor = source->cr_flavor;
1303         target->cr_uid = source->cr_uid;
1304         target->cr_gid = source->cr_gid;
1305         target->cr_group_info = source->cr_group_info;
1306         get_group_info(target->cr_group_info);
1307         target->cr_gss_mech = source->cr_gss_mech;
1308         if (source->cr_gss_mech)
1309                 gss_mech_get(source->cr_gss_mech);
1310         return 0;
1311 }
1312
1313 static long long
1314 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1315 {
1316         long long res;
1317
1318         res = o1->len - o2->len;
1319         if (res)
1320                 return res;
1321         return (long long)memcmp(o1->data, o2->data, o1->len);
1322 }
1323
1324 static int same_name(const char *n1, const char *n2)
1325 {
1326         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1327 }
1328
1329 static int
1330 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1331 {
1332         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1333 }
1334
1335 static int
1336 same_clid(clientid_t *cl1, clientid_t *cl2)
1337 {
1338         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1339 }
1340
1341 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1342 {
1343         int i;
1344
1345         if (g1->ngroups != g2->ngroups)
1346                 return false;
1347         for (i=0; i<g1->ngroups; i++)
1348                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1349                         return false;
1350         return true;
1351 }
1352
1353 /*
1354  * RFC 3530 language requires clid_inuse be returned when the
1355  * "principal" associated with a requests differs from that previously
1356  * used.  We use uid, gid's, and gss principal string as our best
1357  * approximation.  We also don't want to allow non-gss use of a client
1358  * established using gss: in theory cr_principal should catch that
1359  * change, but in practice cr_principal can be null even in the gss case
1360  * since gssd doesn't always pass down a principal string.
1361  */
1362 static bool is_gss_cred(struct svc_cred *cr)
1363 {
1364         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1365         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1366 }
1367
1368
1369 static bool
1370 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1371 {
1372         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1373                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1374                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1375                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1376                 return false;
1377         if (cr1->cr_principal == cr2->cr_principal)
1378                 return true;
1379         if (!cr1->cr_principal || !cr2->cr_principal)
1380                 return false;
1381         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1382 }
1383
1384 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1385 {
1386         struct svc_cred *cr = &rqstp->rq_cred;
1387         u32 service;
1388
1389         if (!cr->cr_gss_mech)
1390                 return false;
1391         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1392         return service == RPC_GSS_SVC_INTEGRITY ||
1393                service == RPC_GSS_SVC_PRIVACY;
1394 }
1395
1396 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1397 {
1398         struct svc_cred *cr = &rqstp->rq_cred;
1399
1400         if (!cl->cl_mach_cred)
1401                 return true;
1402         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1403                 return false;
1404         if (!svc_rqst_integrity_protected(rqstp))
1405                 return false;
1406         if (!cr->cr_principal)
1407                 return false;
1408         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1409 }
1410
1411 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1412 {
1413         static u32 current_clientid = 1;
1414
1415         clp->cl_clientid.cl_boot = nn->boot_time;
1416         clp->cl_clientid.cl_id = current_clientid++;
1417 }
1418
1419 static void gen_confirm(struct nfs4_client *clp)
1420 {
1421         __be32 verf[2];
1422         static u32 i;
1423
1424         verf[0] = (__be32)get_seconds();
1425         verf[1] = (__be32)i++;
1426         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1427 }
1428
1429 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1430 {
1431         struct nfs4_stid *ret;
1432
1433         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1434         if (!ret || !ret->sc_type)
1435                 return NULL;
1436         return ret;
1437 }
1438
1439 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1440 {
1441         struct nfs4_stid *s;
1442
1443         s = find_stateid(cl, t);
1444         if (!s)
1445                 return NULL;
1446         if (typemask & s->sc_type)
1447                 return s;
1448         return NULL;
1449 }
1450
1451 static struct nfs4_client *create_client(struct xdr_netobj name,
1452                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1453 {
1454         struct nfs4_client *clp;
1455         struct sockaddr *sa = svc_addr(rqstp);
1456         int ret;
1457         struct net *net = SVC_NET(rqstp);
1458         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1459
1460         clp = alloc_client(name);
1461         if (clp == NULL)
1462                 return NULL;
1463
1464         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1465         if (ret) {
1466                 spin_lock(&nn->client_lock);
1467                 free_client(clp);
1468                 spin_unlock(&nn->client_lock);
1469                 return NULL;
1470         }
1471         nfsd4_init_callback(&clp->cl_cb_null);
1472         clp->cl_time = get_seconds();
1473         clear_bit(0, &clp->cl_cb_slot_busy);
1474         copy_verf(clp, verf);
1475         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1476         gen_confirm(clp);
1477         clp->cl_cb_session = NULL;
1478         clp->net = net;
1479         return clp;
1480 }
1481
1482 static void
1483 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1484 {
1485         struct rb_node **new = &(root->rb_node), *parent = NULL;
1486         struct nfs4_client *clp;
1487
1488         while (*new) {
1489                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1490                 parent = *new;
1491
1492                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1493                         new = &((*new)->rb_left);
1494                 else
1495                         new = &((*new)->rb_right);
1496         }
1497
1498         rb_link_node(&new_clp->cl_namenode, parent, new);
1499         rb_insert_color(&new_clp->cl_namenode, root);
1500 }
1501
1502 static struct nfs4_client *
1503 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1504 {
1505         long long cmp;
1506         struct rb_node *node = root->rb_node;
1507         struct nfs4_client *clp;
1508
1509         while (node) {
1510                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1511                 cmp = compare_blob(&clp->cl_name, name);
1512                 if (cmp > 0)
1513                         node = node->rb_left;
1514                 else if (cmp < 0)
1515                         node = node->rb_right;
1516                 else
1517                         return clp;
1518         }
1519         return NULL;
1520 }
1521
1522 static void
1523 add_to_unconfirmed(struct nfs4_client *clp)
1524 {
1525         unsigned int idhashval;
1526         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1527
1528         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1529         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1530         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1531         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1532         renew_client(clp);
1533 }
1534
1535 static void
1536 move_to_confirmed(struct nfs4_client *clp)
1537 {
1538         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1539         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1540
1541         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1542         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1543         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1544         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1545         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1546         renew_client(clp);
1547 }
1548
1549 static struct nfs4_client *
1550 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1551 {
1552         struct nfs4_client *clp;
1553         unsigned int idhashval = clientid_hashval(clid->cl_id);
1554
1555         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1556                 if (same_clid(&clp->cl_clientid, clid)) {
1557                         if ((bool)clp->cl_minorversion != sessions)
1558                                 return NULL;
1559                         renew_client(clp);
1560                         return clp;
1561                 }
1562         }
1563         return NULL;
1564 }
1565
1566 static struct nfs4_client *
1567 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1568 {
1569         struct list_head *tbl = nn->conf_id_hashtbl;
1570
1571         return find_client_in_id_table(tbl, clid, sessions);
1572 }
1573
1574 static struct nfs4_client *
1575 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1576 {
1577         struct list_head *tbl = nn->unconf_id_hashtbl;
1578
1579         return find_client_in_id_table(tbl, clid, sessions);
1580 }
1581
1582 static bool clp_used_exchangeid(struct nfs4_client *clp)
1583 {
1584         return clp->cl_exchange_flags != 0;
1585 }
1586
1587 static struct nfs4_client *
1588 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1589 {
1590         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1591 }
1592
1593 static struct nfs4_client *
1594 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1595 {
1596         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1597 }
1598
1599 static void
1600 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1601 {
1602         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1603         struct sockaddr *sa = svc_addr(rqstp);
1604         u32 scopeid = rpc_get_scope_id(sa);
1605         unsigned short expected_family;
1606
1607         /* Currently, we only support tcp and tcp6 for the callback channel */
1608         if (se->se_callback_netid_len == 3 &&
1609             !memcmp(se->se_callback_netid_val, "tcp", 3))
1610                 expected_family = AF_INET;
1611         else if (se->se_callback_netid_len == 4 &&
1612                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1613                 expected_family = AF_INET6;
1614         else
1615                 goto out_err;
1616
1617         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1618                                             se->se_callback_addr_len,
1619                                             (struct sockaddr *)&conn->cb_addr,
1620                                             sizeof(conn->cb_addr));
1621
1622         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1623                 goto out_err;
1624
1625         if (conn->cb_addr.ss_family == AF_INET6)
1626                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1627
1628         conn->cb_prog = se->se_callback_prog;
1629         conn->cb_ident = se->se_callback_ident;
1630         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1631         return;
1632 out_err:
1633         conn->cb_addr.ss_family = AF_UNSPEC;
1634         conn->cb_addrlen = 0;
1635         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1636                 "will not receive delegations\n",
1637                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1638
1639         return;
1640 }
1641
1642 /*
1643  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1644  */
1645 void
1646 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1647 {
1648         struct xdr_buf *buf = resp->xdr.buf;
1649         struct nfsd4_slot *slot = resp->cstate.slot;
1650         unsigned int base;
1651
1652         dprintk("--> %s slot %p\n", __func__, slot);
1653
1654         slot->sl_opcnt = resp->opcnt;
1655         slot->sl_status = resp->cstate.status;
1656
1657         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1658         if (nfsd4_not_cached(resp)) {
1659                 slot->sl_datalen = 0;
1660                 return;
1661         }
1662         base = resp->cstate.data_offset;
1663         slot->sl_datalen = buf->len - base;
1664         if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
1665                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1666         return;
1667 }
1668
1669 /*
1670  * Encode the replay sequence operation from the slot values.
1671  * If cachethis is FALSE encode the uncached rep error on the next
1672  * operation which sets resp->p and increments resp->opcnt for
1673  * nfs4svc_encode_compoundres.
1674  *
1675  */
1676 static __be32
1677 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1678                           struct nfsd4_compoundres *resp)
1679 {
1680         struct nfsd4_op *op;
1681         struct nfsd4_slot *slot = resp->cstate.slot;
1682
1683         /* Encode the replayed sequence operation */
1684         op = &args->ops[resp->opcnt - 1];
1685         nfsd4_encode_operation(resp, op);
1686
1687         /* Return nfserr_retry_uncached_rep in next operation. */
1688         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1689                 op = &args->ops[resp->opcnt++];
1690                 op->status = nfserr_retry_uncached_rep;
1691                 nfsd4_encode_operation(resp, op);
1692         }
1693         return op->status;
1694 }
1695
1696 /*
1697  * The sequence operation is not cached because we can use the slot and
1698  * session values.
1699  */
1700 static __be32
1701 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1702                          struct nfsd4_sequence *seq)
1703 {
1704         struct nfsd4_slot *slot = resp->cstate.slot;
1705         struct xdr_stream *xdr = &resp->xdr;
1706         __be32 *p;
1707         __be32 status;
1708
1709         dprintk("--> %s slot %p\n", __func__, slot);
1710
1711         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1712         if (status)
1713                 return status;
1714
1715         p = xdr_reserve_space(xdr, slot->sl_datalen);
1716         if (!p) {
1717                 WARN_ON_ONCE(1);
1718                 return nfserr_serverfault;
1719         }
1720         xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
1721         xdr_commit_encode(xdr);
1722
1723         resp->opcnt = slot->sl_opcnt;
1724         return slot->sl_status;
1725 }
1726
1727 /*
1728  * Set the exchange_id flags returned by the server.
1729  */
1730 static void
1731 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1732 {
1733         /* pNFS is not supported */
1734         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1735
1736         /* Referrals are supported, Migration is not. */
1737         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1738
1739         /* set the wire flags to return to client. */
1740         clid->flags = new->cl_exchange_flags;
1741 }
1742
1743 static bool client_has_state(struct nfs4_client *clp)
1744 {
1745         /*
1746          * Note clp->cl_openowners check isn't quite right: there's no
1747          * need to count owners without stateid's.
1748          *
1749          * Also note we should probably be using this in 4.0 case too.
1750          */
1751         return !list_empty(&clp->cl_openowners)
1752                 || !list_empty(&clp->cl_delegations)
1753                 || !list_empty(&clp->cl_sessions);
1754 }
1755
1756 __be32
1757 nfsd4_exchange_id(struct svc_rqst *rqstp,
1758                   struct nfsd4_compound_state *cstate,
1759                   struct nfsd4_exchange_id *exid)
1760 {
1761         struct nfs4_client *unconf, *conf, *new;
1762         __be32 status;
1763         char                    addr_str[INET6_ADDRSTRLEN];
1764         nfs4_verifier           verf = exid->verifier;
1765         struct sockaddr         *sa = svc_addr(rqstp);
1766         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1767         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1768
1769         rpc_ntop(sa, addr_str, sizeof(addr_str));
1770         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1771                 "ip_addr=%s flags %x, spa_how %d\n",
1772                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1773                 addr_str, exid->flags, exid->spa_how);
1774
1775         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1776                 return nfserr_inval;
1777
1778         switch (exid->spa_how) {
1779         case SP4_MACH_CRED:
1780                 if (!svc_rqst_integrity_protected(rqstp))
1781                         return nfserr_inval;
1782         case SP4_NONE:
1783                 break;
1784         default:                                /* checked by xdr code */
1785                 WARN_ON_ONCE(1);
1786         case SP4_SSV:
1787                 return nfserr_encr_alg_unsupp;
1788         }
1789
1790         /* Cases below refer to rfc 5661 section 18.35.4: */
1791         nfs4_lock_state();
1792         conf = find_confirmed_client_by_name(&exid->clname, nn);
1793         if (conf) {
1794                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1795                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1796
1797                 if (update) {
1798                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1799                                 status = nfserr_inval;
1800                                 goto out;
1801                         }
1802                         if (!mach_creds_match(conf, rqstp)) {
1803                                 status = nfserr_wrong_cred;
1804                                 goto out;
1805                         }
1806                         if (!creds_match) { /* case 9 */
1807                                 status = nfserr_perm;
1808                                 goto out;
1809                         }
1810                         if (!verfs_match) { /* case 8 */
1811                                 status = nfserr_not_same;
1812                                 goto out;
1813                         }
1814                         /* case 6 */
1815                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1816                         new = conf;
1817                         goto out_copy;
1818                 }
1819                 if (!creds_match) { /* case 3 */
1820                         if (client_has_state(conf)) {
1821                                 status = nfserr_clid_inuse;
1822                                 goto out;
1823                         }
1824                         expire_client(conf);
1825                         goto out_new;
1826                 }
1827                 if (verfs_match) { /* case 2 */
1828                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1829                         new = conf;
1830                         goto out_copy;
1831                 }
1832                 /* case 5, client reboot */
1833                 goto out_new;
1834         }
1835
1836         if (update) { /* case 7 */
1837                 status = nfserr_noent;
1838                 goto out;
1839         }
1840
1841         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1842         if (unconf) /* case 4, possible retry or client restart */
1843                 expire_client(unconf);
1844
1845         /* case 1 (normal case) */
1846 out_new:
1847         new = create_client(exid->clname, rqstp, &verf);
1848         if (new == NULL) {
1849                 status = nfserr_jukebox;
1850                 goto out;
1851         }
1852         new->cl_minorversion = cstate->minorversion;
1853         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1854
1855         gen_clid(new, nn);
1856         add_to_unconfirmed(new);
1857 out_copy:
1858         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1859         exid->clientid.cl_id = new->cl_clientid.cl_id;
1860
1861         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1862         nfsd4_set_ex_flags(new, exid);
1863
1864         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1865                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1866         status = nfs_ok;
1867
1868 out:
1869         nfs4_unlock_state();
1870         return status;
1871 }
1872
1873 static __be32
1874 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1875 {
1876         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1877                 slot_seqid);
1878
1879         /* The slot is in use, and no response has been sent. */
1880         if (slot_inuse) {
1881                 if (seqid == slot_seqid)
1882                         return nfserr_jukebox;
1883                 else
1884                         return nfserr_seq_misordered;
1885         }
1886         /* Note unsigned 32-bit arithmetic handles wraparound: */
1887         if (likely(seqid == slot_seqid + 1))
1888                 return nfs_ok;
1889         if (seqid == slot_seqid)
1890                 return nfserr_replay_cache;
1891         return nfserr_seq_misordered;
1892 }
1893
1894 /*
1895  * Cache the create session result into the create session single DRC
1896  * slot cache by saving the xdr structure. sl_seqid has been set.
1897  * Do this for solo or embedded create session operations.
1898  */
1899 static void
1900 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1901                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1902 {
1903         slot->sl_status = nfserr;
1904         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1905 }
1906
1907 static __be32
1908 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1909                             struct nfsd4_clid_slot *slot)
1910 {
1911         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1912         return slot->sl_status;
1913 }
1914
1915 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1916                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1917                         1 +     /* MIN tag is length with zero, only length */ \
1918                         3 +     /* version, opcount, opcode */ \
1919                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1920                                 /* seqid, slotID, slotID, cache */ \
1921                         4 ) * sizeof(__be32))
1922
1923 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1924                         2 +     /* verifier: AUTH_NULL, length 0 */\
1925                         1 +     /* status */ \
1926                         1 +     /* MIN tag is length with zero, only length */ \
1927                         3 +     /* opcount, opcode, opstatus*/ \
1928                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1929                                 /* seqid, slotID, slotID, slotID, status */ \
1930                         5 ) * sizeof(__be32))
1931
1932 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1933 {
1934         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1935
1936         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1937                 return nfserr_toosmall;
1938         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1939                 return nfserr_toosmall;
1940         ca->headerpadsz = 0;
1941         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1942         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1943         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1944         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1945                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1946         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1947         /*
1948          * Note decreasing slot size below client's request may make it
1949          * difficult for client to function correctly, whereas
1950          * decreasing the number of slots will (just?) affect
1951          * performance.  When short on memory we therefore prefer to
1952          * decrease number of slots instead of their size.  Clients that
1953          * request larger slots than they need will get poor results:
1954          */
1955         ca->maxreqs = nfsd4_get_drc_mem(ca);
1956         if (!ca->maxreqs)
1957                 return nfserr_jukebox;
1958
1959         return nfs_ok;
1960 }
1961
1962 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
1963                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1964 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
1965                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
1966
1967 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1968 {
1969         ca->headerpadsz = 0;
1970
1971         /*
1972          * These RPC_MAX_HEADER macros are overkill, especially since we
1973          * don't even do gss on the backchannel yet.  But this is still
1974          * less than 1k.  Tighten up this estimate in the unlikely event
1975          * it turns out to be a problem for some client:
1976          */
1977         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1978                 return nfserr_toosmall;
1979         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1980                 return nfserr_toosmall;
1981         ca->maxresp_cached = 0;
1982         if (ca->maxops < 2)
1983                 return nfserr_toosmall;
1984
1985         return nfs_ok;
1986 }
1987
1988 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1989 {
1990         switch (cbs->flavor) {
1991         case RPC_AUTH_NULL:
1992         case RPC_AUTH_UNIX:
1993                 return nfs_ok;
1994         default:
1995                 /*
1996                  * GSS case: the spec doesn't allow us to return this
1997                  * error.  But it also doesn't allow us not to support
1998                  * GSS.
1999                  * I'd rather this fail hard than return some error the
2000                  * client might think it can already handle:
2001                  */
2002                 return nfserr_encr_alg_unsupp;
2003         }
2004 }
2005
2006 __be32
2007 nfsd4_create_session(struct svc_rqst *rqstp,
2008                      struct nfsd4_compound_state *cstate,
2009                      struct nfsd4_create_session *cr_ses)
2010 {
2011         struct sockaddr *sa = svc_addr(rqstp);
2012         struct nfs4_client *conf, *unconf;
2013         struct nfsd4_session *new;
2014         struct nfsd4_conn *conn;
2015         struct nfsd4_clid_slot *cs_slot = NULL;
2016         __be32 status = 0;
2017         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2018
2019         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2020                 return nfserr_inval;
2021         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2022         if (status)
2023                 return status;
2024         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2025         if (status)
2026                 return status;
2027         status = check_backchannel_attrs(&cr_ses->back_channel);
2028         if (status)
2029                 goto out_release_drc_mem;
2030         status = nfserr_jukebox;
2031         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2032         if (!new)
2033                 goto out_release_drc_mem;
2034         conn = alloc_conn_from_crses(rqstp, cr_ses);
2035         if (!conn)
2036                 goto out_free_session;
2037
2038         nfs4_lock_state();
2039         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2040         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2041         WARN_ON_ONCE(conf && unconf);
2042
2043         if (conf) {
2044                 status = nfserr_wrong_cred;
2045                 if (!mach_creds_match(conf, rqstp))
2046                         goto out_free_conn;
2047                 cs_slot = &conf->cl_cs_slot;
2048                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2049                 if (status == nfserr_replay_cache) {
2050                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
2051                         goto out_free_conn;
2052                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
2053                         status = nfserr_seq_misordered;
2054                         goto out_free_conn;
2055                 }
2056         } else if (unconf) {
2057                 struct nfs4_client *old;
2058                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2059                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2060                         status = nfserr_clid_inuse;
2061                         goto out_free_conn;
2062                 }
2063                 status = nfserr_wrong_cred;
2064                 if (!mach_creds_match(unconf, rqstp))
2065                         goto out_free_conn;
2066                 cs_slot = &unconf->cl_cs_slot;
2067                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2068                 if (status) {
2069                         /* an unconfirmed replay returns misordered */
2070                         status = nfserr_seq_misordered;
2071                         goto out_free_conn;
2072                 }
2073                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2074                 if (old) {
2075                         status = mark_client_expired(old);
2076                         if (status)
2077                                 goto out_free_conn;
2078                         expire_client(old);
2079                 }
2080                 move_to_confirmed(unconf);
2081                 conf = unconf;
2082         } else {
2083                 status = nfserr_stale_clientid;
2084                 goto out_free_conn;
2085         }
2086         status = nfs_ok;
2087         /*
2088          * We do not support RDMA or persistent sessions
2089          */
2090         cr_ses->flags &= ~SESSION4_PERSIST;
2091         cr_ses->flags &= ~SESSION4_RDMA;
2092
2093         init_session(rqstp, new, conf, cr_ses);
2094         nfsd4_init_conn(rqstp, conn, new);
2095
2096         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2097                NFS4_MAX_SESSIONID_LEN);
2098         cs_slot->sl_seqid++;
2099         cr_ses->seqid = cs_slot->sl_seqid;
2100
2101         /* cache solo and embedded create sessions under the state lock */
2102         nfsd4_cache_create_session(cr_ses, cs_slot, status);
2103         nfs4_unlock_state();
2104         return status;
2105 out_free_conn:
2106         nfs4_unlock_state();
2107         free_conn(conn);
2108 out_free_session:
2109         __free_session(new);
2110 out_release_drc_mem:
2111         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2112         return status;
2113 }
2114
2115 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2116 {
2117         switch (*dir) {
2118         case NFS4_CDFC4_FORE:
2119         case NFS4_CDFC4_BACK:
2120                 return nfs_ok;
2121         case NFS4_CDFC4_FORE_OR_BOTH:
2122         case NFS4_CDFC4_BACK_OR_BOTH:
2123                 *dir = NFS4_CDFC4_BOTH;
2124                 return nfs_ok;
2125         };
2126         return nfserr_inval;
2127 }
2128
2129 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2130 {
2131         struct nfsd4_session *session = cstate->session;
2132         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2133         __be32 status;
2134
2135         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2136         if (status)
2137                 return status;
2138         spin_lock(&nn->client_lock);
2139         session->se_cb_prog = bc->bc_cb_program;
2140         session->se_cb_sec = bc->bc_cb_sec;
2141         spin_unlock(&nn->client_lock);
2142
2143         nfsd4_probe_callback(session->se_client);
2144
2145         return nfs_ok;
2146 }
2147
2148 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2149                      struct nfsd4_compound_state *cstate,
2150                      struct nfsd4_bind_conn_to_session *bcts)
2151 {
2152         __be32 status;
2153         struct nfsd4_conn *conn;
2154         struct nfsd4_session *session;
2155         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2156
2157         if (!nfsd4_last_compound_op(rqstp))
2158                 return nfserr_not_only_op;
2159         nfs4_lock_state();
2160         spin_lock(&nn->client_lock);
2161         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2162         spin_unlock(&nn->client_lock);
2163         status = nfserr_badsession;
2164         if (!session)
2165                 goto out;
2166         status = nfserr_wrong_cred;
2167         if (!mach_creds_match(session->se_client, rqstp))
2168                 goto out;
2169         status = nfsd4_map_bcts_dir(&bcts->dir);
2170         if (status)
2171                 goto out;
2172         conn = alloc_conn(rqstp, bcts->dir);
2173         status = nfserr_jukebox;
2174         if (!conn)
2175                 goto out;
2176         nfsd4_init_conn(rqstp, conn, session);
2177         status = nfs_ok;
2178 out:
2179         nfs4_unlock_state();
2180         return status;
2181 }
2182
2183 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2184 {
2185         if (!session)
2186                 return 0;
2187         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2188 }
2189
2190 __be32
2191 nfsd4_destroy_session(struct svc_rqst *r,
2192                       struct nfsd4_compound_state *cstate,
2193                       struct nfsd4_destroy_session *sessionid)
2194 {
2195         struct nfsd4_session *ses;
2196         __be32 status;
2197         int ref_held_by_me = 0;
2198         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2199
2200         nfs4_lock_state();
2201         status = nfserr_not_only_op;
2202         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2203                 if (!nfsd4_last_compound_op(r))
2204                         goto out;
2205                 ref_held_by_me++;
2206         }
2207         dump_sessionid(__func__, &sessionid->sessionid);
2208         spin_lock(&nn->client_lock);
2209         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2210         status = nfserr_badsession;
2211         if (!ses)
2212                 goto out_client_lock;
2213         status = nfserr_wrong_cred;
2214         if (!mach_creds_match(ses->se_client, r))
2215                 goto out_client_lock;
2216         nfsd4_get_session_locked(ses);
2217         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2218         if (status)
2219                 goto out_put_session;
2220         unhash_session(ses);
2221         spin_unlock(&nn->client_lock);
2222
2223         nfsd4_probe_callback_sync(ses->se_client);
2224
2225         spin_lock(&nn->client_lock);
2226         status = nfs_ok;
2227 out_put_session:
2228         nfsd4_put_session(ses);
2229 out_client_lock:
2230         spin_unlock(&nn->client_lock);
2231 out:
2232         nfs4_unlock_state();
2233         return status;
2234 }
2235
2236 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2237 {
2238         struct nfsd4_conn *c;
2239
2240         list_for_each_entry(c, &s->se_conns, cn_persession) {
2241                 if (c->cn_xprt == xpt) {
2242                         return c;
2243                 }
2244         }
2245         return NULL;
2246 }
2247
2248 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2249 {
2250         struct nfs4_client *clp = ses->se_client;
2251         struct nfsd4_conn *c;
2252         __be32 status = nfs_ok;
2253         int ret;
2254
2255         spin_lock(&clp->cl_lock);
2256         c = __nfsd4_find_conn(new->cn_xprt, ses);
2257         if (c)
2258                 goto out_free;
2259         status = nfserr_conn_not_bound_to_session;
2260         if (clp->cl_mach_cred)
2261                 goto out_free;
2262         __nfsd4_hash_conn(new, ses);
2263         spin_unlock(&clp->cl_lock);
2264         ret = nfsd4_register_conn(new);
2265         if (ret)
2266                 /* oops; xprt is already down: */
2267                 nfsd4_conn_lost(&new->cn_xpt_user);
2268         return nfs_ok;
2269 out_free:
2270         spin_unlock(&clp->cl_lock);
2271         free_conn(new);
2272         return status;
2273 }
2274
2275 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2276 {
2277         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2278
2279         return args->opcnt > session->se_fchannel.maxops;
2280 }
2281
2282 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2283                                   struct nfsd4_session *session)
2284 {
2285         struct xdr_buf *xb = &rqstp->rq_arg;
2286
2287         return xb->len > session->se_fchannel.maxreq_sz;
2288 }
2289
2290 __be32
2291 nfsd4_sequence(struct svc_rqst *rqstp,
2292                struct nfsd4_compound_state *cstate,
2293                struct nfsd4_sequence *seq)
2294 {
2295         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2296         struct xdr_stream *xdr = &resp->xdr;
2297         struct nfsd4_session *session;
2298         struct nfs4_client *clp;
2299         struct nfsd4_slot *slot;
2300         struct nfsd4_conn *conn;
2301         __be32 status;
2302         int buflen;
2303         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2304
2305         if (resp->opcnt != 1)
2306                 return nfserr_sequence_pos;
2307
2308         /*
2309          * Will be either used or freed by nfsd4_sequence_check_conn
2310          * below.
2311          */
2312         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2313         if (!conn)
2314                 return nfserr_jukebox;
2315
2316         spin_lock(&nn->client_lock);
2317         status = nfserr_badsession;
2318         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2319         if (!session)
2320                 goto out_no_session;
2321         clp = session->se_client;
2322         status = get_client_locked(clp);
2323         if (status)
2324                 goto out_no_session;
2325         status = nfsd4_get_session_locked(session);
2326         if (status)
2327                 goto out_put_client;
2328
2329         status = nfserr_too_many_ops;
2330         if (nfsd4_session_too_many_ops(rqstp, session))
2331                 goto out_put_session;
2332
2333         status = nfserr_req_too_big;
2334         if (nfsd4_request_too_big(rqstp, session))
2335                 goto out_put_session;
2336
2337         status = nfserr_badslot;
2338         if (seq->slotid >= session->se_fchannel.maxreqs)
2339                 goto out_put_session;
2340
2341         slot = session->se_slots[seq->slotid];
2342         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2343
2344         /* We do not negotiate the number of slots yet, so set the
2345          * maxslots to the session maxreqs which is used to encode
2346          * sr_highest_slotid and the sr_target_slot id to maxslots */
2347         seq->maxslots = session->se_fchannel.maxreqs;
2348
2349         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2350                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2351         if (status == nfserr_replay_cache) {
2352                 status = nfserr_seq_misordered;
2353                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2354                         goto out_put_session;
2355                 cstate->slot = slot;
2356                 cstate->session = session;
2357                 /* Return the cached reply status and set cstate->status
2358                  * for nfsd4_proc_compound processing */
2359                 status = nfsd4_replay_cache_entry(resp, seq);
2360                 cstate->status = nfserr_replay_cache;
2361                 goto out;
2362         }
2363         if (status)
2364                 goto out_put_session;
2365
2366         status = nfsd4_sequence_check_conn(conn, session);
2367         conn = NULL;
2368         if (status)
2369                 goto out_put_session;
2370
2371         buflen = (seq->cachethis) ?
2372                         session->se_fchannel.maxresp_cached :
2373                         session->se_fchannel.maxresp_sz;
2374         status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
2375                                     nfserr_rep_too_big;
2376         if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
2377                 goto out_put_session;
2378         svc_reserve(rqstp, buflen);
2379
2380         status = nfs_ok;
2381         /* Success! bump slot seqid */
2382         slot->sl_seqid = seq->seqid;
2383         slot->sl_flags |= NFSD4_SLOT_INUSE;
2384         if (seq->cachethis)
2385                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2386         else
2387                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2388
2389         cstate->slot = slot;
2390         cstate->session = session;
2391
2392 out:
2393         switch (clp->cl_cb_state) {
2394         case NFSD4_CB_DOWN:
2395                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2396                 break;
2397         case NFSD4_CB_FAULT:
2398                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2399                 break;
2400         default:
2401                 seq->status_flags = 0;
2402         }
2403         if (!list_empty(&clp->cl_revoked))
2404                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2405 out_no_session:
2406         if (conn)
2407                 free_conn(conn);
2408         spin_unlock(&nn->client_lock);
2409         return status;
2410 out_put_session:
2411         nfsd4_put_session(session);
2412 out_put_client:
2413         put_client_renew_locked(clp);
2414         goto out_no_session;
2415 }
2416
2417 __be32
2418 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2419 {
2420         struct nfs4_client *conf, *unconf, *clp;
2421         __be32 status = 0;
2422         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2423
2424         nfs4_lock_state();
2425         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2426         conf = find_confirmed_client(&dc->clientid, true, nn);
2427         WARN_ON_ONCE(conf && unconf);
2428
2429         if (conf) {
2430                 clp = conf;
2431
2432                 if (client_has_state(conf)) {
2433                         status = nfserr_clientid_busy;
2434                         goto out;
2435                 }
2436         } else if (unconf)
2437                 clp = unconf;
2438         else {
2439                 status = nfserr_stale_clientid;
2440                 goto out;
2441         }
2442         if (!mach_creds_match(clp, rqstp)) {
2443                 status = nfserr_wrong_cred;
2444                 goto out;
2445         }
2446         expire_client(clp);
2447 out:
2448         nfs4_unlock_state();
2449         return status;
2450 }
2451
2452 __be32
2453 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2454 {
2455         __be32 status = 0;
2456
2457         if (rc->rca_one_fs) {
2458                 if (!cstate->current_fh.fh_dentry)
2459                         return nfserr_nofilehandle;
2460                 /*
2461                  * We don't take advantage of the rca_one_fs case.
2462                  * That's OK, it's optional, we can safely ignore it.
2463                  */
2464                  return nfs_ok;
2465         }
2466
2467         nfs4_lock_state();
2468         status = nfserr_complete_already;
2469         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2470                              &cstate->session->se_client->cl_flags))
2471                 goto out;
2472
2473         status = nfserr_stale_clientid;
2474         if (is_client_expired(cstate->session->se_client))
2475                 /*
2476                  * The following error isn't really legal.
2477                  * But we only get here if the client just explicitly
2478                  * destroyed the client.  Surely it no longer cares what
2479                  * error it gets back on an operation for the dead
2480                  * client.
2481                  */
2482                 goto out;
2483
2484         status = nfs_ok;
2485         nfsd4_client_record_create(cstate->session->se_client);
2486 out:
2487         nfs4_unlock_state();
2488         return status;
2489 }
2490
2491 __be32
2492 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2493                   struct nfsd4_setclientid *setclid)
2494 {
2495         struct xdr_netobj       clname = setclid->se_name;
2496         nfs4_verifier           clverifier = setclid->se_verf;
2497         struct nfs4_client      *conf, *unconf, *new;
2498         __be32                  status;
2499         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2500
2501         /* Cases below refer to rfc 3530 section 14.2.33: */
2502         nfs4_lock_state();
2503         conf = find_confirmed_client_by_name(&clname, nn);
2504         if (conf) {
2505                 /* case 0: */
2506                 status = nfserr_clid_inuse;
2507                 if (clp_used_exchangeid(conf))
2508                         goto out;
2509                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2510                         char addr_str[INET6_ADDRSTRLEN];
2511                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2512                                  sizeof(addr_str));
2513                         dprintk("NFSD: setclientid: string in use by client "
2514                                 "at %s\n", addr_str);
2515                         goto out;
2516                 }
2517         }
2518         unconf = find_unconfirmed_client_by_name(&clname, nn);
2519         if (unconf)
2520                 expire_client(unconf);
2521         status = nfserr_jukebox;
2522         new = create_client(clname, rqstp, &clverifier);
2523         if (new == NULL)
2524                 goto out;
2525         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2526                 /* case 1: probable callback update */
2527                 copy_clid(new, conf);
2528         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2529                 gen_clid(new, nn);
2530         new->cl_minorversion = 0;
2531         gen_callback(new, setclid, rqstp);
2532         add_to_unconfirmed(new);
2533         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2534         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2535         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2536         status = nfs_ok;
2537 out:
2538         nfs4_unlock_state();
2539         return status;
2540 }
2541
2542
2543 __be32
2544 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2545                          struct nfsd4_compound_state *cstate,
2546                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2547 {
2548         struct nfs4_client *conf, *unconf;
2549         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2550         clientid_t * clid = &setclientid_confirm->sc_clientid;
2551         __be32 status;
2552         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2553
2554         if (STALE_CLIENTID(clid, nn))
2555                 return nfserr_stale_clientid;
2556         nfs4_lock_state();
2557
2558         conf = find_confirmed_client(clid, false, nn);
2559         unconf = find_unconfirmed_client(clid, false, nn);
2560         /*
2561          * We try hard to give out unique clientid's, so if we get an
2562          * attempt to confirm the same clientid with a different cred,
2563          * there's a bug somewhere.  Let's charitably assume it's our
2564          * bug.
2565          */
2566         status = nfserr_serverfault;
2567         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2568                 goto out;
2569         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2570                 goto out;
2571         /* cases below refer to rfc 3530 section 14.2.34: */
2572         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2573                 if (conf && !unconf) /* case 2: probable retransmit */
2574                         status = nfs_ok;
2575                 else /* case 4: client hasn't noticed we rebooted yet? */
2576                         status = nfserr_stale_clientid;
2577                 goto out;
2578         }
2579         status = nfs_ok;
2580         if (conf) { /* case 1: callback update */
2581                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2582                 nfsd4_probe_callback(conf);
2583                 expire_client(unconf);
2584         } else { /* case 3: normal case; new or rebooted client */
2585                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2586                 if (conf) {
2587                         status = mark_client_expired(conf);
2588                         if (status)
2589                                 goto out;
2590                         expire_client(conf);
2591                 }
2592                 move_to_confirmed(unconf);
2593                 nfsd4_probe_callback(unconf);
2594         }
2595 out:
2596         nfs4_unlock_state();
2597         return status;
2598 }
2599
2600 static struct nfs4_file *nfsd4_alloc_file(void)
2601 {
2602         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2603 }
2604
2605 /* OPEN Share state helper functions */
2606 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2607 {
2608         unsigned int hashval = file_hashval(ino);
2609
2610         atomic_set(&fp->fi_ref, 1);
2611         INIT_LIST_HEAD(&fp->fi_stateids);
2612         INIT_LIST_HEAD(&fp->fi_delegations);
2613         fp->fi_inode = igrab(ino);
2614         fp->fi_had_conflict = false;
2615         fp->fi_lease = NULL;
2616         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2617         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2618         spin_lock(&state_lock);
2619         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2620         spin_unlock(&state_lock);
2621 }
2622
2623 void
2624 nfsd4_free_slabs(void)
2625 {
2626         kmem_cache_destroy(openowner_slab);
2627         kmem_cache_destroy(lockowner_slab);
2628         kmem_cache_destroy(file_slab);
2629         kmem_cache_destroy(stateid_slab);
2630         kmem_cache_destroy(deleg_slab);
2631 }
2632
2633 int
2634 nfsd4_init_slabs(void)
2635 {
2636         openowner_slab = kmem_cache_create("nfsd4_openowners",
2637                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2638         if (openowner_slab == NULL)
2639                 goto out;
2640         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2641                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2642         if (lockowner_slab == NULL)
2643                 goto out_free_openowner_slab;
2644         file_slab = kmem_cache_create("nfsd4_files",
2645                         sizeof(struct nfs4_file), 0, 0, NULL);
2646         if (file_slab == NULL)
2647                 goto out_free_lockowner_slab;
2648         stateid_slab = kmem_cache_create("nfsd4_stateids",
2649                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2650         if (stateid_slab == NULL)
2651                 goto out_free_file_slab;
2652         deleg_slab = kmem_cache_create("nfsd4_delegations",
2653                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2654         if (deleg_slab == NULL)
2655                 goto out_free_stateid_slab;
2656         return 0;
2657
2658 out_free_stateid_slab:
2659         kmem_cache_destroy(stateid_slab);
2660 out_free_file_slab:
2661         kmem_cache_destroy(file_slab);
2662 out_free_lockowner_slab:
2663         kmem_cache_destroy(lockowner_slab);
2664 out_free_openowner_slab:
2665         kmem_cache_destroy(openowner_slab);
2666 out:
2667         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2668         return -ENOMEM;
2669 }
2670
2671 static void init_nfs4_replay(struct nfs4_replay *rp)
2672 {
2673         rp->rp_status = nfserr_serverfault;
2674         rp->rp_buflen = 0;
2675         rp->rp_buf = rp->rp_ibuf;
2676 }
2677
2678 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2679 {
2680         struct nfs4_stateowner *sop;
2681
2682         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2683         if (!sop)
2684                 return NULL;
2685
2686         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2687         if (!sop->so_owner.data) {
2688                 kmem_cache_free(slab, sop);
2689                 return NULL;
2690         }
2691         sop->so_owner.len = owner->len;
2692
2693         INIT_LIST_HEAD(&sop->so_stateids);
2694         sop->so_client = clp;
2695         init_nfs4_replay(&sop->so_replay);
2696         return sop;
2697 }
2698
2699 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2700 {
2701         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2702
2703         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2704         list_add(&oo->oo_perclient, &clp->cl_openowners);
2705 }
2706
2707 static struct nfs4_openowner *
2708 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2709         struct nfs4_openowner *oo;
2710
2711         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2712         if (!oo)
2713                 return NULL;
2714         oo->oo_owner.so_is_open_owner = 1;
2715         oo->oo_owner.so_seqid = open->op_seqid;
2716         oo->oo_flags = NFS4_OO_NEW;
2717         oo->oo_time = 0;
2718         oo->oo_last_closed_stid = NULL;
2719         INIT_LIST_HEAD(&oo->oo_close_lru);
2720         hash_openowner(oo, clp, strhashval);
2721         return oo;
2722 }
2723
2724 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2725         struct nfs4_openowner *oo = open->op_openowner;
2726
2727         stp->st_stid.sc_type = NFS4_OPEN_STID;
2728         INIT_LIST_HEAD(&stp->st_lockowners);
2729         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2730         list_add(&stp->st_perfile, &fp->fi_stateids);
2731         stp->st_stateowner = &oo->oo_owner;
2732         get_nfs4_file(fp);
2733         stp->st_file = fp;
2734         stp->st_access_bmap = 0;
2735         stp->st_deny_bmap = 0;
2736         set_access(open->op_share_access, stp);
2737         set_deny(open->op_share_deny, stp);
2738         stp->st_openstp = NULL;
2739 }
2740
2741 static void
2742 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2743 {
2744         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2745
2746         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2747
2748         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2749         oo->oo_time = get_seconds();
2750 }
2751
2752 static int
2753 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2754                                                         clientid_t *clid)
2755 {
2756         return (sop->so_owner.len == owner->len) &&
2757                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2758                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2759 }
2760
2761 static struct nfs4_openowner *
2762 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2763                         bool sessions, struct nfsd_net *nn)
2764 {
2765         struct nfs4_stateowner *so;
2766         struct nfs4_openowner *oo;
2767         struct nfs4_client *clp;
2768
2769         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2770                 if (!so->so_is_open_owner)
2771                         continue;
2772                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2773                         oo = openowner(so);
2774                         clp = oo->oo_owner.so_client;
2775                         if ((bool)clp->cl_minorversion != sessions)
2776                                 return NULL;
2777                         renew_client(oo->oo_owner.so_client);
2778                         return oo;
2779                 }
2780         }
2781         return NULL;
2782 }
2783
2784 /* search file_hashtbl[] for file */
2785 static struct nfs4_file *
2786 find_file(struct inode *ino)
2787 {
2788         unsigned int hashval = file_hashval(ino);
2789         struct nfs4_file *fp;
2790
2791         spin_lock(&state_lock);
2792         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2793                 if (fp->fi_inode == ino) {
2794                         get_nfs4_file(fp);
2795                         spin_unlock(&state_lock);
2796                         return fp;
2797                 }
2798         }
2799         spin_unlock(&state_lock);
2800         return NULL;
2801 }
2802
2803 /*
2804  * Called to check deny when READ with all zero stateid or
2805  * WRITE with all zero or all one stateid
2806  */
2807 static __be32
2808 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2809 {
2810         struct inode *ino = current_fh->fh_dentry->d_inode;
2811         struct nfs4_file *fp;
2812         struct nfs4_ol_stateid *stp;
2813         __be32 ret;
2814
2815         fp = find_file(ino);
2816         if (!fp)
2817                 return nfs_ok;
2818         ret = nfserr_locked;
2819         /* Search for conflicting share reservations */
2820         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2821                 if (test_deny(deny_type, stp) ||
2822                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2823                         goto out;
2824         }
2825         ret = nfs_ok;
2826 out:
2827         put_nfs4_file(fp);
2828         return ret;
2829 }
2830
2831 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2832 {
2833         struct nfs4_client *clp = dp->dl_stid.sc_client;
2834         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2835
2836         lockdep_assert_held(&state_lock);
2837         /* We're assuming the state code never drops its reference
2838          * without first removing the lease.  Since we're in this lease
2839          * callback (and since the lease code is serialized by the kernel
2840          * lock) we know the server hasn't removed the lease yet, we know
2841          * it's safe to take a reference: */
2842         atomic_inc(&dp->dl_count);
2843
2844         list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2845
2846         /* Only place dl_time is set; protected by i_lock: */
2847         dp->dl_time = get_seconds();
2848
2849         block_delegations(&dp->dl_fh);
2850
2851         nfsd4_cb_recall(dp);
2852 }
2853
2854 /* Called from break_lease() with i_lock held. */
2855 static void nfsd_break_deleg_cb(struct file_lock *fl)
2856 {
2857         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2858         struct nfs4_delegation *dp;
2859
2860         if (!fp) {
2861                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2862                 return;
2863         }
2864         if (fp->fi_had_conflict) {
2865                 WARN(1, "duplicate break on %p\n", fp);
2866                 return;
2867         }
2868         /*
2869          * We don't want the locks code to timeout the lease for us;
2870          * we'll remove it ourself if a delegation isn't returned
2871          * in time:
2872          */
2873         fl->fl_break_time = 0;
2874
2875         spin_lock(&state_lock);
2876         fp->fi_had_conflict = true;
2877         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2878                 nfsd_break_one_deleg(dp);
2879         spin_unlock(&state_lock);
2880 }
2881
2882 static
2883 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2884 {
2885         if (arg & F_UNLCK)
2886                 return lease_modify(onlist, arg);
2887         else
2888                 return -EAGAIN;
2889 }
2890
2891 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2892         .lm_break = nfsd_break_deleg_cb,
2893         .lm_change = nfsd_change_deleg_cb,
2894 };
2895
2896 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2897 {
2898         if (nfsd4_has_session(cstate))
2899                 return nfs_ok;
2900         if (seqid == so->so_seqid - 1)
2901                 return nfserr_replay_me;
2902         if (seqid == so->so_seqid)
2903                 return nfs_ok;
2904         return nfserr_bad_seqid;
2905 }
2906
2907 __be32
2908 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2909                     struct nfsd4_open *open, struct nfsd_net *nn)
2910 {
2911         clientid_t *clientid = &open->op_clientid;
2912         struct nfs4_client *clp = NULL;
2913         unsigned int strhashval;
2914         struct nfs4_openowner *oo = NULL;
2915         __be32 status;
2916
2917         if (STALE_CLIENTID(&open->op_clientid, nn))
2918                 return nfserr_stale_clientid;
2919         /*
2920          * In case we need it later, after we've already created the
2921          * file and don't want to risk a further failure:
2922          */
2923         open->op_file = nfsd4_alloc_file();
2924         if (open->op_file == NULL)
2925                 return nfserr_jukebox;
2926
2927         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2928         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2929         open->op_openowner = oo;
2930         if (!oo) {
2931                 clp = find_confirmed_client(clientid, cstate->minorversion,
2932                                             nn);
2933                 if (clp == NULL)
2934                         return nfserr_expired;
2935                 goto new_owner;
2936         }
2937         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2938                 /* Replace unconfirmed owners without checking for replay. */
2939                 clp = oo->oo_owner.so_client;
2940                 release_openowner(oo);
2941                 open->op_openowner = NULL;
2942                 goto new_owner;
2943         }
2944         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2945         if (status)
2946                 return status;
2947         clp = oo->oo_owner.so_client;
2948         goto alloc_stateid;
2949 new_owner:
2950         oo = alloc_init_open_stateowner(strhashval, clp, open);
2951         if (oo == NULL)
2952                 return nfserr_jukebox;
2953         open->op_openowner = oo;
2954 alloc_stateid:
2955         open->op_stp = nfs4_alloc_stateid(clp);
2956         if (!open->op_stp)
2957                 return nfserr_jukebox;
2958         return nfs_ok;
2959 }
2960
2961 static inline __be32
2962 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2963 {
2964         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2965                 return nfserr_openmode;
2966         else
2967                 return nfs_ok;
2968 }
2969
2970 static int share_access_to_flags(u32 share_access)
2971 {
2972         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2973 }
2974
2975 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2976 {
2977         struct nfs4_stid *ret;
2978
2979         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2980         if (!ret)
2981                 return NULL;
2982         return delegstateid(ret);
2983 }
2984
2985 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2986 {
2987         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2988                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2989 }
2990
2991 static __be32
2992 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2993                 struct nfs4_delegation **dp)
2994 {
2995         int flags;
2996         __be32 status = nfserr_bad_stateid;
2997
2998         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2999         if (*dp == NULL)
3000                 goto out;
3001         flags = share_access_to_flags(open->op_share_access);
3002         status = nfs4_check_delegmode(*dp, flags);
3003         if (status)
3004                 *dp = NULL;
3005 out:
3006         if (!nfsd4_is_deleg_cur(open))
3007                 return nfs_ok;
3008         if (status)
3009                 return status;
3010         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3011         return nfs_ok;
3012 }
3013
3014 static __be32
3015 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
3016 {
3017         struct nfs4_ol_stateid *local;
3018         struct nfs4_openowner *oo = open->op_openowner;
3019
3020         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3021                 /* ignore lock owners */
3022                 if (local->st_stateowner->so_is_open_owner == 0)
3023                         continue;
3024                 /* remember if we have seen this open owner */
3025                 if (local->st_stateowner == &oo->oo_owner)
3026                         *stpp = local;
3027                 /* check for conflicting share reservations */
3028                 if (!test_share(local, open))
3029                         return nfserr_share_denied;
3030         }
3031         return nfs_ok;
3032 }
3033
3034 static inline int nfs4_access_to_access(u32 nfs4_access)
3035 {
3036         int flags = 0;
3037
3038         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
3039                 flags |= NFSD_MAY_READ;
3040         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
3041                 flags |= NFSD_MAY_WRITE;
3042         return flags;
3043 }
3044
3045 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
3046                 struct svc_fh *cur_fh, struct nfsd4_open *open)
3047 {
3048         __be32 status;
3049         int oflag = nfs4_access_to_omode(open->op_share_access);
3050         int access = nfs4_access_to_access(open->op_share_access);
3051
3052         if (!fp->fi_fds[oflag]) {
3053                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
3054                         &fp->fi_fds[oflag]);
3055                 if (status)
3056                         return status;
3057         }
3058         nfs4_file_get_access(fp, oflag);
3059
3060         return nfs_ok;
3061 }
3062
3063 static inline __be32
3064 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
3065                 struct nfsd4_open *open)
3066 {
3067         struct iattr iattr = {
3068                 .ia_valid = ATTR_SIZE,
3069                 .ia_size = 0,
3070         };
3071         if (!open->op_truncate)
3072                 return 0;
3073         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
3074                 return nfserr_inval;
3075         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
3076 }
3077
3078 static __be32
3079 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)
3080 {
3081         u32 op_share_access = open->op_share_access;
3082         bool new_access;
3083         __be32 status;
3084
3085         new_access = !test_access(op_share_access, stp);
3086         if (new_access) {
3087                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
3088                 if (status)
3089                         return status;
3090         }
3091         status = nfsd4_truncate(rqstp, cur_fh, open);
3092         if (status) {
3093                 if (new_access) {
3094                         int oflag = nfs4_access_to_omode(op_share_access);
3095                         nfs4_file_put_access(fp, oflag);
3096                 }
3097                 return status;
3098         }
3099         /* remember the open */
3100         set_access(op_share_access, stp);
3101         set_deny(open->op_share_deny, stp);
3102
3103         return nfs_ok;
3104 }
3105
3106
3107 static void
3108 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3109 {
3110         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3111 }
3112
3113 /* Should we give out recallable state?: */
3114 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3115 {
3116         if (clp->cl_cb_state == NFSD4_CB_UP)
3117                 return true;
3118         /*
3119          * In the sessions case, since we don't have to establish a
3120          * separate connection for callbacks, we assume it's OK
3121          * until we hear otherwise:
3122          */
3123         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3124 }
3125
3126 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3127 {
3128         struct file_lock *fl;
3129
3130         fl = locks_alloc_lock();
3131         if (!fl)
3132                 return NULL;
3133         locks_init_lock(fl);
3134         fl->fl_lmops = &nfsd_lease_mng_ops;
3135         fl->fl_flags = FL_DELEG;
3136         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3137         fl->fl_end = OFFSET_MAX;
3138         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3139         fl->fl_pid = current->tgid;
3140         return fl;
3141 }
3142
3143 static int nfs4_setlease(struct nfs4_delegation *dp)
3144 {
3145         struct nfs4_file *fp = dp->dl_file;
3146         struct file_lock *fl;
3147         int status;
3148
3149         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3150         if (!fl)
3151                 return -ENOMEM;
3152         fl->fl_file = find_readable_file(fp);
3153         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3154         if (status)
3155                 goto out_free;
3156         fp->fi_lease = fl;
3157         fp->fi_deleg_file = get_file(fl->fl_file);
3158         atomic_set(&fp->fi_delegees, 1);
3159         spin_lock(&state_lock);
3160         hash_delegation_locked(dp, fp);
3161         spin_unlock(&state_lock);
3162         return 0;
3163 out_free:
3164         locks_free_lock(fl);
3165         return status;
3166 }
3167
3168 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3169 {
3170         if (fp->fi_had_conflict)
3171                 return -EAGAIN;
3172         get_nfs4_file(fp);
3173         dp->dl_file = fp;
3174         if (!fp->fi_lease)
3175                 return nfs4_setlease(dp);
3176         spin_lock(&state_lock);
3177         atomic_inc(&fp->fi_delegees);
3178         if (fp->fi_had_conflict) {
3179                 spin_unlock(&state_lock);
3180                 return -EAGAIN;
3181         }
3182         hash_delegation_locked(dp, fp);
3183         spin_unlock(&state_lock);
3184         return 0;
3185 }
3186
3187 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3188 {
3189         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3190         if (status == -EAGAIN)
3191                 open->op_why_no_deleg = WND4_CONTENTION;
3192         else {
3193                 open->op_why_no_deleg = WND4_RESOURCE;
3194                 switch (open->op_deleg_want) {
3195                 case NFS4_SHARE_WANT_READ_DELEG:
3196                 case NFS4_SHARE_WANT_WRITE_DELEG:
3197                 case NFS4_SHARE_WANT_ANY_DELEG:
3198                         break;
3199                 case NFS4_SHARE_WANT_CANCEL:
3200                         open->op_why_no_deleg = WND4_CANCELLED;
3201                         break;
3202                 case NFS4_SHARE_WANT_NO_DELEG:
3203                         WARN_ON_ONCE(1);
3204                 }
3205         }
3206 }
3207
3208 /*
3209  * Attempt to hand out a delegation.
3210  *
3211  * Note we don't support write delegations, and won't until the vfs has
3212  * proper support for them.
3213  */
3214 static void
3215 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3216                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3217 {
3218         struct nfs4_delegation *dp;
3219         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3220         int cb_up;
3221         int status = 0;
3222
3223         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3224         open->op_recall = 0;
3225         switch (open->op_claim_type) {
3226                 case NFS4_OPEN_CLAIM_PREVIOUS:
3227                         if (!cb_up)
3228                                 open->op_recall = 1;
3229                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3230                                 goto out_no_deleg;
3231                         break;
3232                 case NFS4_OPEN_CLAIM_NULL:
3233                 case NFS4_OPEN_CLAIM_FH:
3234                         /*
3235                          * Let's not give out any delegations till everyone's
3236                          * had the chance to reclaim theirs....
3237                          */
3238                         if (locks_in_grace(net))
3239                                 goto out_no_deleg;
3240                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3241                                 goto out_no_deleg;
3242                         /*
3243                          * Also, if the file was opened for write or
3244                          * create, there's a good chance the client's
3245                          * about to write to it, resulting in an
3246                          * immediate recall (since we don't support
3247                          * write delegations):
3248                          */
3249                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3250                                 goto out_no_deleg;
3251                         if (open->op_create == NFS4_OPEN_CREATE)
3252                                 goto out_no_deleg;
3253                         break;
3254                 default:
3255                         goto out_no_deleg;
3256         }
3257         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3258         if (dp == NULL)
3259                 goto out_no_deleg;
3260         status = nfs4_set_delegation(dp, stp->st_file);
3261         if (status)
3262                 goto out_free;
3263
3264         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3265
3266         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3267                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3268         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3269         return;
3270 out_free:
3271         destroy_delegation(dp);
3272 out_no_deleg:
3273         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3274         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3275             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3276                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3277                 open->op_recall = 1;
3278         }
3279
3280         /* 4.1 client asking for a delegation? */
3281         if (open->op_deleg_want)
3282                 nfsd4_open_deleg_none_ext(open, status);
3283         return;
3284 }
3285
3286 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3287                                         struct nfs4_delegation *dp)
3288 {
3289         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3290             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3291                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3292                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3293         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3294                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3295                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3296                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3297         }
3298         /* Otherwise the client must be confused wanting a delegation
3299          * it already has, therefore we don't return
3300          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3301          */
3302 }
3303
3304 /*
3305  * called with nfs4_lock_state() held.
3306  */
3307 __be32
3308 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3309 {
3310         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3311         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3312         struct nfs4_file *fp = NULL;
3313         struct inode *ino = current_fh->fh_dentry->d_inode;
3314         struct nfs4_ol_stateid *stp = NULL;
3315         struct nfs4_delegation *dp = NULL;
3316         __be32 status;
3317
3318         /*
3319          * Lookup file; if found, lookup stateid and check open request,
3320          * and check for delegations in the process of being recalled.
3321          * If not found, create the nfs4_file struct
3322          */
3323         fp = find_file(ino);
3324         if (fp) {
3325                 if ((status = nfs4_check_open(fp, open, &stp)))
3326                         goto out;
3327                 status = nfs4_check_deleg(cl, open, &dp);
3328                 if (status)
3329                         goto out;
3330         } else {
3331                 status = nfserr_bad_stateid;
3332                 if (nfsd4_is_deleg_cur(open))
3333                         goto out;
3334                 status = nfserr_jukebox;
3335                 fp = open->op_file;
3336                 open->op_file = NULL;
3337                 nfsd4_init_file(fp, ino);
3338         }
3339
3340         /*
3341          * OPEN the file, or upgrade an existing OPEN.
3342          * If truncate fails, the OPEN fails.
3343          */
3344         if (stp) {
3345                 /* Stateid was found, this is an OPEN upgrade */
3346                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3347                 if (status)
3348                         goto out;
3349         } else {
3350                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3351                 if (status)
3352                         goto out;
3353                 status = nfsd4_truncate(rqstp, current_fh, open);
3354                 if (status)
3355                         goto out;
3356                 stp = open->op_stp;
3357                 open->op_stp = NULL;
3358                 init_open_stateid(stp, fp, open);
3359         }
3360         update_stateid(&stp->st_stid.sc_stateid);
3361         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3362
3363         if (nfsd4_has_session(&resp->cstate)) {
3364                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3365
3366                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3367                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3368                         open->op_why_no_deleg = WND4_NOT_WANTED;
3369                         goto nodeleg;
3370                 }
3371         }
3372
3373         /*
3374         * Attempt to hand out a delegation. No error return, because the
3375         * OPEN succeeds even if we fail.
3376         */
3377         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3378 nodeleg:
3379         status = nfs_ok;
3380
3381         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3382                 STATEID_VAL(&stp->st_stid.sc_stateid));
3383 out:
3384         /* 4.1 client trying to upgrade/downgrade delegation? */
3385         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3386             open->op_deleg_want)
3387                 nfsd4_deleg_xgrade_none_ext(open, dp);
3388
3389         if (fp)
3390                 put_nfs4_file(fp);
3391         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3392                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3393         /*
3394         * To finish the open response, we just need to set the rflags.
3395         */
3396         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3397         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3398             !nfsd4_has_session(&resp->cstate))
3399                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3400
3401         return status;
3402 }
3403
3404 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3405 {
3406         if (open->op_openowner) {
3407                 struct nfs4_openowner *oo = open->op_openowner;
3408
3409                 if (!list_empty(&oo->oo_owner.so_stateids))
3410                         list_del_init(&oo->oo_close_lru);
3411                 if (oo->oo_flags & NFS4_OO_NEW) {
3412                         if (status) {
3413                                 release_openowner(oo);
3414                                 open->op_openowner = NULL;
3415                         } else
3416                                 oo->oo_flags &= ~NFS4_OO_NEW;
3417                 }
3418         }
3419         if (open->op_file)
3420                 nfsd4_free_file(open->op_file);
3421         if (open->op_stp)
3422                 free_generic_stateid(open->op_stp);
3423 }
3424
3425 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3426 {
3427         struct nfs4_client *found;
3428
3429         if (STALE_CLIENTID(clid, nn))
3430                 return nfserr_stale_clientid;
3431         found = find_confirmed_client(clid, session, nn);
3432         if (clp)
3433                 *clp = found;
3434         return found ? nfs_ok : nfserr_expired;
3435 }
3436
3437 __be32
3438 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3439             clientid_t *clid)
3440 {
3441         struct nfs4_client *clp;
3442         __be32 status;
3443         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3444
3445         nfs4_lock_state();
3446         dprintk("process_renew(%08x/%08x): starting\n",
3447                         clid->cl_boot, clid->cl_id);
3448         status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3449         if (status)
3450                 goto out;
3451         status = nfserr_cb_path_down;
3452         if (!list_empty(&clp->cl_delegations)
3453                         && clp->cl_cb_state != NFSD4_CB_UP)
3454                 goto out;
3455         status = nfs_ok;
3456 out:
3457         nfs4_unlock_state();
3458         return status;
3459 }
3460
3461 static void
3462 nfsd4_end_grace(struct nfsd_net *nn)
3463 {
3464         /* do nothing if grace period already ended */
3465         if (nn->grace_ended)
3466                 return;
3467
3468         dprintk("NFSD: end of grace period\n");
3469         nn->grace_ended = true;
3470         nfsd4_record_grace_done(nn, nn->boot_time);
3471         locks_end_grace(&nn->nfsd4_manager);
3472         /*
3473          * Now that every NFSv4 client has had the chance to recover and
3474          * to see the (possibly new, possibly shorter) lease time, we
3475          * can safely set the next grace time to the current lease time:
3476          */
3477         nn->nfsd4_grace = nn->nfsd4_lease;
3478 }
3479
3480 static time_t
3481 nfs4_laundromat(struct nfsd_net *nn)
3482 {
3483         struct nfs4_client *clp;
3484         struct nfs4_openowner *oo;
3485         struct nfs4_delegation *dp;
3486         struct list_head *pos, *next, reaplist;
3487         time_t cutoff = get_seconds() - nn->nfsd4_lease;
3488         time_t t, new_timeo = nn->nfsd4_lease;
3489
3490         nfs4_lock_state();
3491
3492         dprintk("NFSD: laundromat service - starting\n");
3493         nfsd4_end_grace(nn);
3494         INIT_LIST_HEAD(&reaplist);
3495         spin_lock(&nn->client_lock);
3496         list_for_each_safe(pos, next, &nn->client_lru) {
3497                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3498                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3499                         t = clp->cl_time - cutoff;
3500                         new_timeo = min(new_timeo, t);
3501                         break;
3502                 }
3503                 if (mark_client_expired_locked(clp)) {
3504                         dprintk("NFSD: client in use (clientid %08x)\n",
3505                                 clp->cl_clientid.cl_id);
3506                         continue;
3507                 }
3508                 list_move(&clp->cl_lru, &reaplist);
3509         }
3510         spin_unlock(&nn->client_lock);
3511         list_for_each_safe(pos, next, &reaplist) {
3512                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3513                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3514                         clp->cl_clientid.cl_id);
3515                 expire_client(clp);
3516         }
3517         spin_lock(&state_lock);
3518         list_for_each_safe(pos, next, &nn->del_recall_lru) {
3519                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3520                 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3521                         continue;
3522                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3523                         t = dp->dl_time - cutoff;
3524                         new_timeo = min(new_timeo, t);
3525                         break;
3526                 }
3527                 list_move(&dp->dl_recall_lru, &reaplist);
3528         }
3529         spin_unlock(&state_lock);
3530         list_for_each_safe(pos, next, &reaplist) {
3531                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3532                 revoke_delegation(dp);
3533         }
3534         list_for_each_safe(pos, next, &nn->close_lru) {
3535                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3536                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3537                         t = oo->oo_time - cutoff;
3538                         new_timeo = min(new_timeo, t);
3539                         break;
3540                 }
3541                 release_openowner(oo);
3542         }
3543         new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
3544         nfs4_unlock_state();
3545         return new_timeo;
3546 }
3547
3548 static struct workqueue_struct *laundry_wq;
3549 static void laundromat_main(struct work_struct *);
3550
3551 static void
3552 laundromat_main(struct work_struct *laundry)
3553 {
3554         time_t t;
3555         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3556                                                   work);
3557         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3558                                            laundromat_work);
3559
3560         t = nfs4_laundromat(nn);
3561         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3562         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3563 }
3564
3565 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3566 {
3567         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3568                 return nfserr_bad_stateid;
3569         return nfs_ok;
3570 }
3571
3572 static inline int
3573 access_permit_read(struct nfs4_ol_stateid *stp)
3574 {
3575         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3576                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3577                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3578 }
3579
3580 static inline int
3581 access_permit_write(struct nfs4_ol_stateid *stp)
3582 {
3583         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3584                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3585 }
3586
3587 static
3588 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3589 {
3590         __be32 status = nfserr_openmode;
3591
3592         /* For lock stateid's, we test the parent open, not the lock: */
3593         if (stp->st_openstp)
3594                 stp = stp->st_openstp;
3595         if ((flags & WR_STATE) && !access_permit_write(stp))
3596                 goto out;
3597         if ((flags & RD_STATE) && !access_permit_read(stp))
3598                 goto out;
3599         status = nfs_ok;
3600 out:
3601         return status;
3602 }
3603
3604 static inline __be32
3605 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3606 {
3607         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3608                 return nfs_ok;
3609         else if (locks_in_grace(net)) {
3610                 /* Answer in remaining cases depends on existence of
3611                  * conflicting state; so we must wait out the grace period. */
3612                 return nfserr_grace;
3613         } else if (flags & WR_STATE)
3614                 return nfs4_share_conflict(current_fh,
3615                                 NFS4_SHARE_DENY_WRITE);
3616         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3617                 return nfs4_share_conflict(current_fh,
3618                                 NFS4_SHARE_DENY_READ);
3619 }
3620
3621 /*
3622  * Allow READ/WRITE during grace period on recovered state only for files
3623  * that are not able to provide mandatory locking.
3624  */
3625 static inline int
3626 grace_disallows_io(struct net *net, struct inode *inode)
3627 {
3628         return locks_in_grace(net) && mandatory_lock(inode);
3629 }
3630
3631 /* Returns true iff a is later than b: */
3632 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3633 {
3634         return (s32)(a->si_generation - b->si_generation) > 0;
3635 }
3636
3637 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3638 {
3639         /*
3640          * When sessions are used the stateid generation number is ignored
3641          * when it is zero.
3642          */
3643         if (has_session && in->si_generation == 0)
3644                 return nfs_ok;
3645
3646         if (in->si_generation == ref->si_generation)
3647                 return nfs_ok;
3648
3649         /* If the client sends us a stateid from the future, it's buggy: */
3650         if (stateid_generation_after(in, ref))
3651                 return nfserr_bad_stateid;
3652         /*
3653          * However, we could see a stateid from the past, even from a
3654          * non-buggy client.  For example, if the client sends a lock
3655          * while some IO is outstanding, the lock may bump si_generation
3656          * while the IO is still in flight.  The client could avoid that
3657          * situation by waiting for responses on all the IO requests,
3658          * but better performance may result in retrying IO that
3659          * receives an old_stateid error if requests are rarely
3660          * reordered in flight:
3661          */
3662         return nfserr_old_stateid;
3663 }
3664
3665 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3666 {
3667         struct nfs4_stid *s;
3668         struct nfs4_ol_stateid *ols;
3669         __be32 status;
3670
3671         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3672                 return nfserr_bad_stateid;
3673         /* Client debugging aid. */
3674         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3675                 char addr_str[INET6_ADDRSTRLEN];
3676                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3677                                  sizeof(addr_str));
3678                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3679                                         "with incorrect client ID\n", addr_str);
3680                 return nfserr_bad_stateid;
3681         }
3682         s = find_stateid(cl, stateid);
3683         if (!s)
3684                 return nfserr_bad_stateid;
3685         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3686         if (status)
3687                 return status;
3688         switch (s->sc_type) {
3689         case NFS4_DELEG_STID:
3690                 return nfs_ok;
3691         case NFS4_REVOKED_DELEG_STID:
3692                 return nfserr_deleg_revoked;
3693         case NFS4_OPEN_STID:
3694         case NFS4_LOCK_STID:
3695                 ols = openlockstateid(s);
3696                 if (ols->st_stateowner->so_is_open_owner
3697                                 && !(openowner(ols->st_stateowner)->oo_flags
3698                                                 & NFS4_OO_CONFIRMED))
3699                         return nfserr_bad_stateid;
3700                 return nfs_ok;
3701         default:
3702                 printk("unknown stateid type %x\n", s->sc_type);
3703         case NFS4_CLOSED_STID:
3704                 return nfserr_bad_stateid;
3705         }
3706 }
3707
3708 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3709                                    struct nfs4_stid **s, bool sessions,
3710                                    struct nfsd_net *nn)
3711 {
3712         struct nfs4_client *cl;
3713         __be32 status;
3714
3715         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3716                 return nfserr_bad_stateid;
3717         status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3718                                                         nn, &cl);
3719         if (status == nfserr_stale_clientid) {
3720                 if (sessions)
3721                         return nfserr_bad_stateid;
3722                 return nfserr_stale_stateid;
3723         }
3724         if (status)
3725                 return status;
3726         *s = find_stateid_by_type(cl, stateid, typemask);
3727         if (!*s)
3728                 return nfserr_bad_stateid;
3729         return nfs_ok;
3730 }
3731
3732 /*
3733 * Checks for stateid operations
3734 */
3735 __be32
3736 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3737                            stateid_t *stateid, int flags, struct file **filpp)
3738 {
3739         struct nfs4_stid *s;
3740         struct nfs4_ol_stateid *stp = NULL;
3741         struct nfs4_delegation *dp = NULL;
3742         struct svc_fh *current_fh = &cstate->current_fh;
3743         struct inode *ino = current_fh->fh_dentry->d_inode;
3744         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3745         struct file *file = NULL;
3746         __be32 status;
3747
3748         if (filpp)
3749                 *filpp = NULL;
3750
3751         if (grace_disallows_io(net, ino))
3752                 return nfserr_grace;
3753
3754         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3755                 return check_special_stateids(net, current_fh, stateid, flags);
3756
3757         nfs4_lock_state();
3758
3759         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3760                                       &s, cstate->minorversion, nn);
3761         if (status)
3762                 goto out;
3763         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3764         if (status)
3765                 goto out;
3766         switch (s->sc_type) {
3767         case NFS4_DELEG_STID:
3768                 dp = delegstateid(s);
3769                 status = nfs4_check_delegmode(dp, flags);
3770                 if (status)
3771                         goto out;
3772                 if (filpp) {
3773                         file = dp->dl_file->fi_deleg_file;
3774                         if (!file) {
3775                                 WARN_ON_ONCE(1);
3776                                 status = nfserr_serverfault;
3777                                 goto out;
3778                         }
3779                 }
3780                 break;
3781         case NFS4_OPEN_STID:
3782         case NFS4_LOCK_STID:
3783                 stp = openlockstateid(s);
3784                 status = nfs4_check_fh(current_fh, stp);
3785                 if (status)
3786                         goto out;
3787                 if (stp->st_stateowner->so_is_open_owner
3788                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3789                         goto out;
3790                 status = nfs4_check_openmode(stp, flags);
3791                 if (status)
3792                         goto out;
3793                 if (filpp) {
3794                         if (flags & RD_STATE)
3795                                 file = find_readable_file(stp->st_file);
3796                         else
3797                                 file = find_writeable_file(stp->st_file);
3798                 }
3799                 break;
3800         default:
3801                 status = nfserr_bad_stateid;
3802                 goto out;
3803         }
3804         status = nfs_ok;
3805         if (file)
3806                 *filpp = get_file(file);
3807 out:
3808         nfs4_unlock_state();
3809         return status;
3810 }
3811
3812 static __be32
3813 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3814 {
3815         struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
3816
3817         if (check_for_locks(stp->st_file, lo))
3818                 return nfserr_locks_held;
3819         /*
3820          * Currently there's a 1-1 lock stateid<->lockowner
3821          * correspondance, and we have to delete the lockowner when we
3822          * delete the lock stateid:
3823          */
3824         release_lockowner(lo);
3825         return nfs_ok;
3826 }
3827
3828 /*
3829  * Test if the stateid is valid
3830  */
3831 __be32
3832 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3833                    struct nfsd4_test_stateid *test_stateid)
3834 {
3835         struct nfsd4_test_stateid_id *stateid;
3836         struct nfs4_client *cl = cstate->session->se_client;
3837
3838         nfs4_lock_state();
3839         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3840                 stateid->ts_id_status =
3841                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3842         nfs4_unlock_state();
3843
3844         return nfs_ok;
3845 }
3846
3847 __be32
3848 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3849                    struct nfsd4_free_stateid *free_stateid)
3850 {
3851         stateid_t *stateid = &free_stateid->fr_stateid;
3852         struct nfs4_stid *s;
3853         struct nfs4_delegation *dp;
3854         struct nfs4_client *cl = cstate->session->se_client;
3855         __be32 ret = nfserr_bad_stateid;
3856
3857         nfs4_lock_state();
3858         s = find_stateid(cl, stateid);
3859         if (!s)
3860                 goto out;
3861         switch (s->sc_type) {
3862         case NFS4_DELEG_STID:
3863                 ret = nfserr_locks_held;
3864                 goto out;
3865         case NFS4_OPEN_STID:
3866         case NFS4_LOCK_STID:
3867                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3868                 if (ret)
3869                         goto out;
3870                 if (s->sc_type == NFS4_LOCK_STID)
3871                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3872                 else
3873                         ret = nfserr_locks_held;
3874                 break;
3875         case NFS4_REVOKED_DELEG_STID:
3876                 dp = delegstateid(s);
3877                 destroy_revoked_delegation(dp);
3878                 ret = nfs_ok;
3879                 break;
3880         default:
3881                 ret = nfserr_bad_stateid;
3882         }
3883 out:
3884         nfs4_unlock_state();
3885         return ret;
3886 }
3887
3888 static inline int
3889 setlkflg (int type)
3890 {
3891         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3892                 RD_STATE : WR_STATE;
3893 }
3894
3895 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3896 {
3897         struct svc_fh *current_fh = &cstate->current_fh;
3898         struct nfs4_stateowner *sop = stp->st_stateowner;
3899         __be32 status;
3900
3901         status = nfsd4_check_seqid(cstate, sop, seqid);
3902         if (status)
3903                 return status;
3904         if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3905                 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3906                 /*
3907                  * "Closed" stateid's exist *only* to return
3908                  * nfserr_replay_me from the previous step, and
3909                  * revoked delegations are kept only for free_stateid.
3910                  */
3911                 return nfserr_bad_stateid;
3912         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3913         if (status)
3914                 return status;
3915         return nfs4_check_fh(current_fh, stp);
3916 }
3917
3918 /*
3919  * Checks for sequence id mutating operations.
3920  */
3921 static __be32
3922 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3923                          stateid_t *stateid, char typemask,
3924                          struct nfs4_ol_stateid **stpp,
3925                          struct nfsd_net *nn)
3926 {
3927         __be32 status;
3928         struct nfs4_stid *s;
3929
3930         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3931                 seqid, STATEID_VAL(stateid));
3932
3933         *stpp = NULL;
3934         status = nfsd4_lookup_stateid(stateid, typemask, &s,
3935                                       cstate->minorversion, nn);
3936         if (status)
3937                 return status;
3938         *stpp = openlockstateid(s);
3939         if (!nfsd4_has_session(cstate))
3940                 cstate->replay_owner = (*stpp)->st_stateowner;
3941
3942         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3943 }
3944
3945 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3946                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3947 {
3948         __be32 status;
3949         struct nfs4_openowner *oo;
3950
3951         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3952                                                 NFS4_OPEN_STID, stpp, nn);
3953         if (status)
3954                 return status;
3955         oo = openowner((*stpp)->st_stateowner);
3956         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3957                 return nfserr_bad_stateid;
3958         return nfs_ok;
3959 }
3960
3961 __be32
3962 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3963                    struct nfsd4_open_confirm *oc)
3964 {
3965         __be32 status;
3966         struct nfs4_openowner *oo;
3967         struct nfs4_ol_stateid *stp;
3968         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3969
3970         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
3971                         cstate->current_fh.fh_dentry);
3972
3973         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3974         if (status)
3975                 return status;
3976
3977         nfs4_lock_state();
3978
3979         status = nfs4_preprocess_seqid_op(cstate,
3980                                         oc->oc_seqid, &oc->oc_req_stateid,
3981                                         NFS4_OPEN_STID, &stp, nn);
3982         if (status)
3983                 goto out;
3984         oo = openowner(stp->st_stateowner);
3985         status = nfserr_bad_stateid;
3986         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3987                 goto out;
3988         oo->oo_flags |= NFS4_OO_CONFIRMED;
3989         update_stateid(&stp->st_stid.sc_stateid);
3990         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3991         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3992                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3993
3994         nfsd4_client_record_create(oo->oo_owner.so_client);
3995         status = nfs_ok;
3996 out:
3997         nfsd4_bump_seqid(cstate, status);
3998         if (!cstate->replay_owner)
3999                 nfs4_unlock_state();
4000         return status;
4001 }
4002
4003 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
4004 {
4005         if (!test_access(access, stp))
4006                 return;
4007         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
4008         clear_access(access, stp);
4009 }
4010
4011 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
4012 {
4013         switch (to_access) {
4014         case NFS4_SHARE_ACCESS_READ:
4015                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
4016                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
4017                 break;
4018         case NFS4_SHARE_ACCESS_WRITE:
4019                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
4020                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
4021                 break;
4022         case NFS4_SHARE_ACCESS_BOTH:
4023                 break;
4024         default:
4025                 WARN_ON_ONCE(1);
4026         }
4027 }
4028
4029 static void
4030 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
4031 {
4032         int i;
4033         for (i = 0; i < 4; i++) {
4034                 if ((i & deny) != i)
4035                         clear_deny(i, stp);
4036         }
4037 }
4038
4039 __be32
4040 nfsd4_open_downgrade(struct svc_rqst *rqstp,
4041                      struct nfsd4_compound_state *cstate,
4042                      struct nfsd4_open_downgrade *od)
4043 {
4044         __be32 status;
4045         struct nfs4_ol_stateid *stp;
4046         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4047
4048         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
4049                         cstate->current_fh.fh_dentry);
4050
4051         /* We don't yet support WANT bits: */
4052         if (od->od_deleg_want)
4053                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
4054                         od->od_deleg_want);
4055
4056         nfs4_lock_state();
4057         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
4058                                         &od->od_stateid, &stp, nn);
4059         if (status)
4060                 goto out;
4061         status = nfserr_inval;
4062         if (!test_access(od->od_share_access, stp)) {
4063                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
4064                         stp->st_access_bmap, od->od_share_access);
4065                 goto out;
4066         }
4067         if (!test_deny(od->od_share_deny, stp)) {
4068                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
4069                         stp->st_deny_bmap, od->od_share_deny);
4070                 goto out;
4071         }
4072         nfs4_stateid_downgrade(stp, od->od_share_access);
4073
4074         reset_union_bmap_deny(od->od_share_deny, stp);
4075
4076         update_stateid(&stp->st_stid.sc_stateid);
4077         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4078         status = nfs_ok;
4079 out:
4080         nfsd4_bump_seqid(cstate, status);
4081         if (!cstate->replay_owner)
4082                 nfs4_unlock_state();
4083         return status;
4084 }
4085
4086 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
4087 {
4088         unhash_open_stateid(s);
4089         s->st_stid.sc_type = NFS4_CLOSED_STID;
4090 }
4091
4092 /*
4093  * nfs4_unlock_state() called after encode
4094  */
4095 __be32
4096 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4097             struct nfsd4_close *close)
4098 {
4099         __be32 status;
4100         struct nfs4_openowner *oo;
4101         struct nfs4_ol_stateid *stp;
4102         struct net *net = SVC_NET(rqstp);
4103         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4104
4105         dprintk("NFSD: nfsd4_close on file %pd\n",
4106                         cstate->current_fh.fh_dentry);
4107
4108         nfs4_lock_state();
4109         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4110                                         &close->cl_stateid,
4111                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
4112                                         &stp, nn);
4113         nfsd4_bump_seqid(cstate, status);
4114         if (status)
4115                 goto out;
4116         oo = openowner(stp->st_stateowner);
4117         update_stateid(&stp->st_stid.sc_stateid);
4118         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4119
4120         nfsd4_close_open_stateid(stp);
4121
4122         if (cstate->minorversion)
4123                 free_generic_stateid(stp);
4124         else
4125                 oo->oo_last_closed_stid = stp;
4126
4127         if (list_empty(&oo->oo_owner.so_stateids)) {
4128                 if (cstate->minorversion)
4129                         release_openowner(oo);
4130                 else {
4131                         /*
4132                          * In the 4.0 case we need to keep the owners around a
4133                          * little while to handle CLOSE replay.
4134                          */
4135                         move_to_close_lru(oo, SVC_NET(rqstp));
4136                 }
4137         }
4138 out:
4139         if (!cstate->replay_owner)
4140                 nfs4_unlock_state();
4141         return status;
4142 }
4143
4144 __be32
4145 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4146                   struct nfsd4_delegreturn *dr)
4147 {
4148         struct nfs4_delegation *dp;
4149         stateid_t *stateid = &dr->dr_stateid;
4150         struct nfs4_stid *s;
4151         __be32 status;
4152         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4153
4154         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4155                 return status;
4156
4157         nfs4_lock_state();
4158         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
4159                                       cstate->minorversion, nn);
4160         if (status)
4161                 goto out;
4162         dp = delegstateid(s);
4163         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4164         if (status)
4165                 goto out;
4166
4167         destroy_delegation(dp);
4168 out:
4169         nfs4_unlock_state();
4170
4171         return status;
4172 }
4173
4174
4175 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
4176
4177 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
4178
4179 static inline u64
4180 end_offset(u64 start, u64 len)
4181 {
4182         u64 end;
4183
4184         end = start + len;
4185         return end >= start ? end: NFS4_MAX_UINT64;
4186 }
4187
4188 /* last octet in a range */
4189 static inline u64
4190 last_byte_offset(u64 start, u64 len)
4191 {
4192         u64 end;
4193
4194         WARN_ON_ONCE(!len);
4195         end = start + len;
4196         return end > start ? end - 1: NFS4_MAX_UINT64;
4197 }
4198
4199 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4200 {
4201         return (file_hashval(inode) + cl_id
4202                         + opaque_hashval(ownername->data, ownername->len))
4203                 & LOCKOWNER_INO_HASH_MASK;
4204 }
4205
4206 /*
4207  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4208  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4209  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
4210  * locking, this prevents us from being completely protocol-compliant.  The
4211  * real solution to this problem is to start using unsigned file offsets in
4212  * the VFS, but this is a very deep change!
4213  */
4214 static inline void
4215 nfs4_transform_lock_offset(struct file_lock *lock)
4216 {
4217         if (lock->fl_start < 0)
4218                 lock->fl_start = OFFSET_MAX;
4219         if (lock->fl_end < 0)
4220                 lock->fl_end = OFFSET_MAX;
4221 }
4222
4223 /* Hack!: For now, we're defining this just so we can use a pointer to it
4224  * as a unique cookie to identify our (NFSv4's) posix locks. */
4225 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
4226 };
4227
4228 static inline void
4229 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4230 {
4231         struct nfs4_lockowner *lo;
4232
4233         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4234                 lo = (struct nfs4_lockowner *) fl->fl_owner;
4235                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4236                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
4237                 if (!deny->ld_owner.data)
4238                         /* We just don't care that much */
4239                         goto nevermind;
4240                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4241                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4242         } else {
4243 nevermind:
4244                 deny->ld_owner.len = 0;
4245                 deny->ld_owner.data = NULL;
4246                 deny->ld_clientid.cl_boot = 0;
4247                 deny->ld_clientid.cl_id = 0;
4248         }
4249         deny->ld_start = fl->fl_start;
4250         deny->ld_length = NFS4_MAX_UINT64;
4251         if (fl->fl_end != NFS4_MAX_UINT64)
4252                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
4253         deny->ld_type = NFS4_READ_LT;
4254         if (fl->fl_type != F_RDLCK)
4255                 deny->ld_type = NFS4_WRITE_LT;
4256 }
4257
4258 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
4259 {
4260         struct nfs4_ol_stateid *lst;
4261
4262         if (!same_owner_str(&lo->lo_owner, owner, clid))
4263                 return false;
4264         if (list_empty(&lo->lo_owner.so_stateids)) {
4265                 WARN_ON_ONCE(1);
4266                 return false;
4267         }
4268         lst = list_first_entry(&lo->lo_owner.so_stateids,
4269                                struct nfs4_ol_stateid, st_perstateowner);
4270         return lst->st_file->fi_inode == inode;
4271 }
4272
4273 static struct nfs4_lockowner *
4274 find_lockowner_str(struct inode *inode, clientid_t *clid,
4275                    struct xdr_netobj *owner, struct nfsd_net *nn)
4276 {
4277         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4278         struct nfs4_lockowner *lo;
4279
4280         list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4281                 if (same_lockowner_ino(lo, inode, clid, owner))
4282                         return lo;
4283         }
4284         return NULL;
4285 }
4286
4287 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4288 {
4289         struct inode *inode = open_stp->st_file->fi_inode;
4290         unsigned int inohash = lockowner_ino_hashval(inode,
4291                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4292         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4293
4294         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4295         list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4296         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
4297 }
4298
4299 /*
4300  * Alloc a lock owner structure.
4301  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
4302  * occurred.
4303  *
4304  * strhashval = ownerstr_hashval
4305  */
4306
4307 static struct nfs4_lockowner *
4308 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4309         struct nfs4_lockowner *lo;
4310
4311         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4312         if (!lo)
4313                 return NULL;
4314         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4315         lo->lo_owner.so_is_open_owner = 0;
4316         /* It is the openowner seqid that will be incremented in encode in the
4317          * case of new lockowners; so increment the lock seqid manually: */
4318         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4319         hash_lockowner(lo, strhashval, clp, open_stp);
4320         return lo;
4321 }
4322
4323 static struct nfs4_ol_stateid *
4324 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4325 {
4326         struct nfs4_ol_stateid *stp;
4327         struct nfs4_client *clp = lo->lo_owner.so_client;
4328
4329         stp = nfs4_alloc_stateid(clp);
4330         if (stp == NULL)
4331                 return NULL;
4332         stp->st_stid.sc_type = NFS4_LOCK_STID;
4333         list_add(&stp->st_perfile, &fp->fi_stateids);
4334         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4335         stp->st_stateowner = &lo->lo_owner;
4336         get_nfs4_file(fp);
4337         stp->st_file = fp;
4338         stp->st_access_bmap = 0;
4339         stp->st_deny_bmap = open_stp->st_deny_bmap;
4340         stp->st_openstp = open_stp;
4341         return stp;
4342 }
4343
4344 static int
4345 check_lock_length(u64 offset, u64 length)
4346 {
4347         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4348              LOFF_OVERFLOW(offset, length)));
4349 }
4350
4351 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4352 {
4353         struct nfs4_file *fp = lock_stp->st_file;
4354         int oflag = nfs4_access_to_omode(access);
4355
4356         if (test_access(access, lock_stp))
4357                 return;
4358         nfs4_file_get_access(fp, oflag);
4359         set_access(access, lock_stp);
4360 }
4361
4362 static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
4363 {
4364         struct nfs4_file *fi = ost->st_file;
4365         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4366         struct nfs4_client *cl = oo->oo_owner.so_client;
4367         struct nfs4_lockowner *lo;
4368         unsigned int strhashval;
4369         struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4370
4371         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4372                                 &lock->v.new.owner, nn);
4373         if (lo) {
4374                 if (!cstate->minorversion)
4375                         return nfserr_bad_seqid;
4376                 /* XXX: a lockowner always has exactly one stateid: */
4377                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4378                                 struct nfs4_ol_stateid, st_perstateowner);
4379                 return nfs_ok;
4380         }
4381         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4382                         &lock->v.new.owner);
4383         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4384         if (lo == NULL)
4385                 return nfserr_jukebox;
4386         *lst = alloc_init_lock_stateid(lo, fi, ost);
4387         if (*lst == NULL) {
4388                 release_lockowner(lo);
4389                 return nfserr_jukebox;
4390         }
4391         *new = true;
4392         return nfs_ok;
4393 }
4394
4395 /*
4396  *  LOCK operation
4397  */
4398 __be32
4399 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4400            struct nfsd4_lock *lock)
4401 {
4402         struct nfs4_openowner *open_sop = NULL;
4403         struct nfs4_lockowner *lock_sop = NULL;
4404         struct nfs4_ol_stateid *lock_stp;
4405         struct file *filp = NULL;
4406         struct file_lock *file_lock = NULL;
4407         struct file_lock *conflock = NULL;
4408         __be32 status = 0;
4409         bool new_state = false;
4410         int lkflg;
4411         int err;
4412         struct net *net = SVC_NET(rqstp);
4413         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4414
4415         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4416                 (long long) lock->lk_offset,
4417                 (long long) lock->lk_length);
4418
4419         if (check_lock_length(lock->lk_offset, lock->lk_length))
4420                  return nfserr_inval;
4421
4422         if ((status = fh_verify(rqstp, &cstate->current_fh,
4423                                 S_IFREG, NFSD_MAY_LOCK))) {
4424                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4425                 return status;
4426         }
4427
4428         nfs4_lock_state();
4429
4430         if (lock->lk_is_new) {
4431                 struct nfs4_ol_stateid *open_stp = NULL;
4432
4433                 if (nfsd4_has_session(cstate))
4434                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4435                         memcpy(&lock->v.new.clientid,
4436                                 &cstate->session->se_client->cl_clientid,
4437                                 sizeof(clientid_t));
4438
4439                 status = nfserr_stale_clientid;
4440                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4441                         goto out;
4442
4443                 /* validate and update open stateid and open seqid */
4444                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4445                                         lock->lk_new_open_seqid,
4446                                         &lock->lk_new_open_stateid,
4447                                         &open_stp, nn);
4448                 if (status)
4449                         goto out;
4450                 open_sop = openowner(open_stp->st_stateowner);
4451                 status = nfserr_bad_stateid;
4452                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4453                                                 &lock->v.new.clientid))
4454                         goto out;
4455                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4456                                                         &lock_stp, &new_state);
4457         } else
4458                 status = nfs4_preprocess_seqid_op(cstate,
4459                                        lock->lk_old_lock_seqid,
4460                                        &lock->lk_old_lock_stateid,
4461                                        NFS4_LOCK_STID, &lock_stp, nn);
4462         if (status)
4463                 goto out;
4464         lock_sop = lockowner(lock_stp->st_stateowner);
4465
4466         lkflg = setlkflg(lock->lk_type);
4467         status = nfs4_check_openmode(lock_stp, lkflg);
4468         if (status)
4469                 goto out;
4470
4471         status = nfserr_grace;
4472         if (locks_in_grace(net) && !lock->lk_reclaim)
4473                 goto out;
4474         status = nfserr_no_grace;
4475         if (!locks_in_grace(net) && lock->lk_reclaim)
4476                 goto out;
4477
4478         file_lock = locks_alloc_lock();
4479         if (!file_lock) {
4480                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4481                 status = nfserr_jukebox;
4482                 goto out;
4483         }
4484
4485         locks_init_lock(file_lock);
4486         switch (lock->lk_type) {
4487                 case NFS4_READ_LT:
4488                 case NFS4_READW_LT:
4489                         filp = find_readable_file(lock_stp->st_file);
4490                         if (filp)
4491                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4492                         file_lock->fl_type = F_RDLCK;
4493                         break;
4494                 case NFS4_WRITE_LT:
4495                 case NFS4_WRITEW_LT:
4496                         filp = find_writeable_file(lock_stp->st_file);
4497                         if (filp)
4498                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4499                         file_lock->fl_type = F_WRLCK;
4500                         break;
4501                 default:
4502                         status = nfserr_inval;
4503                 goto out;
4504         }
4505         if (!filp) {
4506                 status = nfserr_openmode;
4507                 goto out;
4508         }
4509         file_lock->fl_owner = (fl_owner_t)lock_sop;
4510         file_lock->fl_pid = current->tgid;
4511         file_lock->fl_file = filp;
4512         file_lock->fl_flags = FL_POSIX;
4513         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4514         file_lock->fl_start = lock->lk_offset;
4515         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4516         nfs4_transform_lock_offset(file_lock);
4517
4518         conflock = locks_alloc_lock();
4519         if (!conflock) {
4520                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4521                 status = nfserr_jukebox;
4522                 goto out;
4523         }
4524
4525         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4526         switch (-err) {
4527         case 0: /* success! */
4528                 update_stateid(&lock_stp->st_stid.sc_stateid);
4529                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4530                                 sizeof(stateid_t));
4531                 status = 0;
4532                 break;
4533         case (EAGAIN):          /* conflock holds conflicting lock */
4534                 status = nfserr_denied;
4535                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4536                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4537                 break;
4538         case (EDEADLK):
4539                 status = nfserr_deadlock;
4540                 break;
4541         default:
4542                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4543                 status = nfserrno(err);
4544                 break;
4545         }
4546 out:
4547         if (status && new_state)
4548                 release_lockowner(lock_sop);
4549         nfsd4_bump_seqid(cstate, status);
4550         if (!cstate->replay_owner)
4551                 nfs4_unlock_state();
4552         if (file_lock)
4553                 locks_free_lock(file_lock);
4554         if (conflock)
4555                 locks_free_lock(conflock);
4556         return status;
4557 }
4558
4559 /*
4560  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4561  * so we do a temporary open here just to get an open file to pass to
4562  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4563  * inode operation.)
4564  */
4565 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4566 {
4567         struct file *file;
4568         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4569         if (!err) {
4570                 err = nfserrno(vfs_test_lock(file, lock));
4571                 nfsd_close(file);
4572         }
4573         return err;
4574 }
4575
4576 /*
4577  * LOCKT operation
4578  */
4579 __be32
4580 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4581             struct nfsd4_lockt *lockt)
4582 {
4583         struct inode *inode;
4584         struct file_lock *file_lock = NULL;
4585         struct nfs4_lockowner *lo;
4586         __be32 status;
4587         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4588
4589         if (locks_in_grace(SVC_NET(rqstp)))
4590                 return nfserr_grace;
4591
4592         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4593                  return nfserr_inval;
4594
4595         nfs4_lock_state();
4596
4597         if (!nfsd4_has_session(cstate)) {
4598                 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4599                 if (status)
4600                         goto out;
4601         }
4602
4603         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4604                 goto out;
4605
4606         inode = cstate->current_fh.fh_dentry->d_inode;
4607         file_lock = locks_alloc_lock();
4608         if (!file_lock) {
4609                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4610                 status = nfserr_jukebox;
4611                 goto out;
4612         }
4613         locks_init_lock(file_lock);
4614         switch (lockt->lt_type) {
4615                 case NFS4_READ_LT:
4616                 case NFS4_READW_LT:
4617                         file_lock->fl_type = F_RDLCK;
4618                 break;
4619                 case NFS4_WRITE_LT:
4620                 case NFS4_WRITEW_LT:
4621                         file_lock->fl_type = F_WRLCK;
4622                 break;
4623                 default:
4624                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4625                         status = nfserr_inval;
4626                 goto out;
4627         }
4628
4629         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4630         if (lo)
4631                 file_lock->fl_owner = (fl_owner_t)lo;
4632         file_lock->fl_pid = current->tgid;
4633         file_lock->fl_flags = FL_POSIX;
4634
4635         file_lock->fl_start = lockt->lt_offset;
4636         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4637
4638         nfs4_transform_lock_offset(file_lock);
4639
4640         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4641         if (status)
4642                 goto out;
4643
4644         if (file_lock->fl_type != F_UNLCK) {
4645                 status = nfserr_denied;
4646                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4647         }
4648 out:
4649         nfs4_unlock_state();
4650         if (file_lock)
4651                 locks_free_lock(file_lock);
4652         return status;
4653 }
4654
4655 __be32
4656 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4657             struct nfsd4_locku *locku)
4658 {
4659         struct nfs4_ol_stateid *stp;
4660         struct file *filp = NULL;
4661         struct file_lock *file_lock = NULL;
4662         __be32 status;
4663         int err;
4664         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4665
4666         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4667                 (long long) locku->lu_offset,
4668                 (long long) locku->lu_length);
4669
4670         if (check_lock_length(locku->lu_offset, locku->lu_length))
4671                  return nfserr_inval;
4672
4673         nfs4_lock_state();
4674
4675         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4676                                         &locku->lu_stateid, NFS4_LOCK_STID,
4677                                         &stp, nn);
4678         if (status)
4679                 goto out;
4680         filp = find_any_file(stp->st_file);
4681         if (!filp) {
4682                 status = nfserr_lock_range;
4683                 goto out;
4684         }
4685         file_lock = locks_alloc_lock();
4686         if (!file_lock) {
4687                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4688                 status = nfserr_jukebox;
4689                 goto out;
4690         }
4691         locks_init_lock(file_lock);
4692         file_lock->fl_type = F_UNLCK;
4693         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4694         file_lock->fl_pid = current->tgid;
4695         file_lock->fl_file = filp;
4696         file_lock->fl_flags = FL_POSIX;
4697         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4698         file_lock->fl_start = locku->lu_offset;
4699
4700         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4701                                                 locku->lu_length);
4702         nfs4_transform_lock_offset(file_lock);
4703
4704         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4705         if (err) {
4706                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4707                 goto out_nfserr;
4708         }
4709         update_stateid(&stp->st_stid.sc_stateid);
4710         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4711
4712 out:
4713         nfsd4_bump_seqid(cstate, status);
4714         if (!cstate->replay_owner)
4715                 nfs4_unlock_state();
4716         if (file_lock)
4717                 locks_free_lock(file_lock);
4718         return status;
4719
4720 out_nfserr:
4721         status = nfserrno(err);
4722         goto out;
4723 }
4724
4725 /*
4726  * returns
4727  *      1: locks held by lockowner
4728  *      0: no locks held by lockowner
4729  */
4730 static int
4731 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4732 {
4733         struct file_lock **flpp;
4734         struct inode *inode = filp->fi_inode;
4735         int status = 0;
4736
4737         spin_lock(&inode->i_lock);
4738         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4739                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4740                         status = 1;
4741                         goto out;
4742                 }
4743         }
4744 out:
4745         spin_unlock(&inode->i_lock);
4746         return status;
4747 }
4748
4749 __be32
4750 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4751                         struct nfsd4_compound_state *cstate,
4752                         struct nfsd4_release_lockowner *rlockowner)
4753 {
4754         clientid_t *clid = &rlockowner->rl_clientid;
4755         struct nfs4_stateowner *sop;
4756         struct nfs4_lockowner *lo;
4757         struct nfs4_ol_stateid *stp;
4758         struct xdr_netobj *owner = &rlockowner->rl_owner;
4759         struct list_head matches;
4760         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4761         __be32 status;
4762         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4763
4764         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4765                 clid->cl_boot, clid->cl_id);
4766
4767         nfs4_lock_state();
4768
4769         status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4770         if (status)
4771                 goto out;
4772
4773         status = nfserr_locks_held;
4774         INIT_LIST_HEAD(&matches);
4775
4776         list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4777                 if (sop->so_is_open_owner)
4778                         continue;
4779                 if (!same_owner_str(sop, owner, clid))
4780                         continue;
4781                 list_for_each_entry(stp, &sop->so_stateids,
4782                                 st_perstateowner) {
4783                         lo = lockowner(sop);
4784                         if (check_for_locks(stp->st_file, lo))
4785                                 goto out;
4786                         list_add(&lo->lo_list, &matches);
4787                 }
4788         }
4789         /* Clients probably won't expect us to return with some (but not all)
4790          * of the lockowner state released; so don't release any until all
4791          * have been checked. */
4792         status = nfs_ok;
4793         while (!list_empty(&matches)) {
4794                 lo = list_entry(matches.next, struct nfs4_lockowner,
4795                                                                 lo_list);
4796                 /* unhash_stateowner deletes so_perclient only
4797                  * for openowners. */
4798                 list_del(&lo->lo_list);
4799                 release_lockowner(lo);
4800         }
4801 out:
4802         nfs4_unlock_state();
4803         return status;
4804 }
4805
4806 static inline struct nfs4_client_reclaim *
4807 alloc_reclaim(void)
4808 {
4809         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4810 }
4811
4812 bool
4813 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4814 {
4815         struct nfs4_client_reclaim *crp;
4816
4817         crp = nfsd4_find_reclaim_client(name, nn);
4818         return (crp && crp->cr_clp);
4819 }
4820
4821 /*
4822  * failure => all reset bets are off, nfserr_no_grace...
4823  */
4824 struct nfs4_client_reclaim *
4825 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4826 {
4827         unsigned int strhashval;
4828         struct nfs4_client_reclaim *crp;
4829
4830         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4831         crp = alloc_reclaim();
4832         if (crp) {
4833                 strhashval = clientstr_hashval(name);
4834                 INIT_LIST_HEAD(&crp->cr_strhash);
4835                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4836                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4837                 crp->cr_clp = NULL;
4838                 nn->reclaim_str_hashtbl_size++;
4839         }
4840         return crp;
4841 }
4842
4843 void
4844 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4845 {
4846         list_del(&crp->cr_strhash);
4847         kfree(crp);
4848         nn->reclaim_str_hashtbl_size--;
4849 }
4850
4851 void
4852 nfs4_release_reclaim(struct nfsd_net *nn)
4853 {
4854         struct nfs4_client_reclaim *crp = NULL;
4855         int i;
4856
4857         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4858                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4859                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4860                                         struct nfs4_client_reclaim, cr_strhash);
4861                         nfs4_remove_reclaim_record(crp, nn);
4862                 }
4863         }
4864         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4865 }
4866
4867 /*
4868  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4869 struct nfs4_client_reclaim *
4870 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4871 {
4872         unsigned int strhashval;
4873         struct nfs4_client_reclaim *crp = NULL;
4874
4875         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4876
4877         strhashval = clientstr_hashval(recdir);
4878         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4879                 if (same_name(crp->cr_recdir, recdir)) {
4880                         return crp;
4881                 }
4882         }
4883         return NULL;
4884 }
4885
4886 /*
4887 * Called from OPEN. Look for clientid in reclaim list.
4888 */
4889 __be32
4890 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4891 {
4892         struct nfs4_client *clp;
4893
4894         /* find clientid in conf_id_hashtbl */
4895         clp = find_confirmed_client(clid, sessions, nn);
4896         if (clp == NULL)
4897                 return nfserr_reclaim_bad;
4898
4899         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4900 }
4901
4902 #ifdef CONFIG_NFSD_FAULT_INJECTION
4903
4904 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4905 {
4906         if (mark_client_expired(clp))
4907                 return 0;
4908         expire_client(clp);
4909         return 1;
4910 }
4911
4912 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4913 {
4914         char buf[INET6_ADDRSTRLEN];
4915         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4916         printk(KERN_INFO "NFS Client: %s\n", buf);
4917         return 1;
4918 }
4919
4920 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4921                              const char *type)
4922 {
4923         char buf[INET6_ADDRSTRLEN];
4924         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4925         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4926 }
4927
4928 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4929 {
4930         struct nfs4_openowner *oop;
4931         struct nfs4_lockowner *lop, *lo_next;
4932         struct nfs4_ol_stateid *stp, *st_next;
4933         u64 count = 0;
4934
4935         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4936                 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4937                         list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4938                                 if (func)
4939                                         func(lop);
4940                                 if (++count == max)
4941                                         return count;
4942                         }
4943                 }
4944         }
4945
4946         return count;
4947 }
4948
4949 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4950 {
4951         return nfsd_foreach_client_lock(clp, max, release_lockowner);
4952 }
4953
4954 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4955 {
4956         u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4957         nfsd_print_count(clp, count, "locked files");
4958         return count;
4959 }
4960
4961 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4962 {
4963         struct nfs4_openowner *oop, *next;
4964         u64 count = 0;
4965
4966         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4967                 if (func)
4968                         func(oop);
4969                 if (++count == max)
4970                         break;
4971         }
4972
4973         return count;
4974 }
4975
4976 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4977 {
4978         return nfsd_foreach_client_open(clp, max, release_openowner);
4979 }
4980
4981 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4982 {
4983         u64 count = nfsd_foreach_client_open(clp, max, NULL);
4984         nfsd_print_count(clp, count, "open files");
4985         return count;
4986 }
4987
4988 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4989                                      struct list_head *victims)
4990 {
4991         struct nfs4_delegation *dp, *next;
4992         u64 count = 0;
4993
4994         lockdep_assert_held(&state_lock);
4995         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4996                 if (victims)
4997                         list_move(&dp->dl_recall_lru, victims);
4998                 if (++count == max)
4999                         break;
5000         }
5001         return count;
5002 }
5003
5004 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
5005 {
5006         struct nfs4_delegation *dp, *next;
5007         LIST_HEAD(victims);
5008         u64 count;
5009
5010         spin_lock(&state_lock);
5011         count = nfsd_find_all_delegations(clp, max, &victims);
5012         spin_unlock(&state_lock);
5013
5014         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
5015                 revoke_delegation(dp);
5016
5017         return count;
5018 }
5019
5020 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
5021 {
5022         struct nfs4_delegation *dp, *next;
5023         LIST_HEAD(victims);
5024         u64 count;
5025
5026         spin_lock(&state_lock);
5027         count = nfsd_find_all_delegations(clp, max, &victims);
5028         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
5029                 nfsd_break_one_deleg(dp);
5030         spin_unlock(&state_lock);
5031
5032         return count;
5033 }
5034
5035 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
5036 {
5037         u64 count = 0;
5038
5039         spin_lock(&state_lock);
5040         count = nfsd_find_all_delegations(clp, max, NULL);
5041         spin_unlock(&state_lock);
5042
5043         nfsd_print_count(clp, count, "delegations");
5044         return count;
5045 }
5046
5047 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
5048 {
5049         struct nfs4_client *clp, *next;
5050         u64 count = 0;
5051         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
5052
5053         if (!nfsd_netns_ready(nn))
5054                 return 0;
5055
5056         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
5057                 count += func(clp, max - count);
5058                 if ((max != 0) && (count >= max))
5059                         break;
5060         }
5061
5062         return count;
5063 }
5064
5065 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
5066 {
5067         struct nfs4_client *clp;
5068         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
5069
5070         if (!nfsd_netns_ready(nn))
5071                 return NULL;
5072
5073         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
5074                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
5075                         return clp;
5076         }
5077         return NULL;
5078 }
5079
5080 #endif /* CONFIG_NFSD_FAULT_INJECTION */
5081
5082 /*
5083  * Since the lifetime of a delegation isn't limited to that of an open, a
5084  * client may quite reasonably hang on to a delegation as long as it has
5085  * the inode cached.  This becomes an obvious problem the first time a
5086  * client's inode cache approaches the size of the server's total memory.
5087  *
5088  * For now we avoid this problem by imposing a hard limit on the number
5089  * of delegations, which varies according to the server's memory size.
5090  */
5091 static void
5092 set_max_delegations(void)
5093 {
5094         /*
5095          * Allow at most 4 delegations per megabyte of RAM.  Quick
5096          * estimates suggest that in the worst case (where every delegation
5097          * is for a different inode), a delegation could take about 1.5K,
5098          * giving a worst case usage of about 6% of memory.
5099          */
5100         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
5101 }
5102
5103 static int nfs4_state_create_net(struct net *net)
5104 {
5105         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5106         int i;
5107
5108         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5109                         CLIENT_HASH_SIZE, GFP_KERNEL);
5110         if (!nn->conf_id_hashtbl)
5111                 goto err;
5112         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5113                         CLIENT_HASH_SIZE, GFP_KERNEL);
5114         if (!nn->unconf_id_hashtbl)
5115                 goto err_unconf_id;
5116         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5117                         OWNER_HASH_SIZE, GFP_KERNEL);
5118         if (!nn->ownerstr_hashtbl)
5119                 goto err_ownerstr;
5120         nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
5121                         LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
5122         if (!nn->lockowner_ino_hashtbl)
5123                 goto err_lockowner_ino;
5124         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5125                         SESSION_HASH_SIZE, GFP_KERNEL);
5126         if (!nn->sessionid_hashtbl)
5127                 goto err_sessionid;
5128
5129         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5130                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5131                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5132         }
5133         for (i = 0; i < OWNER_HASH_SIZE; i++)
5134                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5135         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
5136                 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
5137         for (i = 0; i < SESSION_HASH_SIZE; i++)
5138                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5139         nn->conf_name_tree = RB_ROOT;
5140         nn->unconf_name_tree = RB_ROOT;
5141         INIT_LIST_HEAD(&nn->client_lru);
5142         INIT_LIST_HEAD(&nn->close_lru);
5143         INIT_LIST_HEAD(&nn->del_recall_lru);
5144         spin_lock_init(&nn->client_lock);
5145
5146         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
5147         get_net(net);
5148
5149         return 0;
5150
5151 err_sessionid:
5152         kfree(nn->lockowner_ino_hashtbl);
5153 err_lockowner_ino:
5154         kfree(nn->ownerstr_hashtbl);
5155 err_ownerstr:
5156         kfree(nn->unconf_id_hashtbl);
5157 err_unconf_id:
5158         kfree(nn->conf_id_hashtbl);
5159 err:
5160         return -ENOMEM;
5161 }
5162
5163 static void
5164 nfs4_state_destroy_net(struct net *net)
5165 {
5166         int i;
5167         struct nfs4_client *clp = NULL;
5168         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5169
5170         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5171                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
5172                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5173                         destroy_client(clp);
5174                 }
5175         }
5176
5177         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5178                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5179                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5180                         destroy_client(clp);
5181                 }
5182         }
5183
5184         kfree(nn->sessionid_hashtbl);
5185         kfree(nn->lockowner_ino_hashtbl);
5186         kfree(nn->ownerstr_hashtbl);
5187         kfree(nn->unconf_id_hashtbl);
5188         kfree(nn->conf_id_hashtbl);
5189         put_net(net);
5190 }
5191
5192 int
5193 nfs4_state_start_net(struct net *net)
5194 {
5195         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5196         int ret;
5197
5198         ret = nfs4_state_create_net(net);
5199         if (ret)
5200                 return ret;
5201         nfsd4_client_tracking_init(net);
5202         nn->boot_time = get_seconds();
5203         locks_start_grace(net, &nn->nfsd4_manager);
5204         nn->grace_ended = false;
5205         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5206                nn->nfsd4_grace, net);
5207         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5208         return 0;
5209 }
5210
5211 /* initialization to perform when the nfsd service is started: */
5212
5213 int
5214 nfs4_state_start(void)
5215 {
5216         int ret;
5217
5218         ret = set_callback_cred();
5219         if (ret)
5220                 return -ENOMEM;
5221         laundry_wq = create_singlethread_workqueue("nfsd4");
5222         if (laundry_wq == NULL) {
5223                 ret = -ENOMEM;
5224                 goto out_recovery;
5225         }
5226         ret = nfsd4_create_callback_queue();
5227         if (ret)
5228                 goto out_free_laundry;
5229
5230         set_max_delegations();
5231
5232         return 0;
5233
5234 out_free_laundry:
5235         destroy_workqueue(laundry_wq);
5236 out_recovery:
5237         return ret;
5238 }
5239
5240 void
5241 nfs4_state_shutdown_net(struct net *net)
5242 {
5243         struct nfs4_delegation *dp = NULL;
5244         struct list_head *pos, *next, reaplist;
5245         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5246
5247         cancel_delayed_work_sync(&nn->laundromat_work);
5248         locks_end_grace(&nn->nfsd4_manager);
5249
5250         nfs4_lock_state();
5251         INIT_LIST_HEAD(&reaplist);
5252         spin_lock(&state_lock);
5253         list_for_each_safe(pos, next, &nn->del_recall_lru) {
5254                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5255                 list_move(&dp->dl_recall_lru, &reaplist);
5256         }
5257         spin_unlock(&state_lock);
5258         list_for_each_safe(pos, next, &reaplist) {
5259                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5260                 destroy_delegation(dp);
5261         }
5262
5263         nfsd4_client_tracking_exit(net);
5264         nfs4_state_destroy_net(net);
5265         nfs4_unlock_state();
5266 }
5267
5268 void
5269 nfs4_state_shutdown(void)
5270 {
5271         destroy_workqueue(laundry_wq);
5272         nfsd4_destroy_callback_queue();
5273 }
5274
5275 static void
5276 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5277 {
5278         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5279                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5280 }
5281
5282 static void
5283 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5284 {
5285         if (cstate->minorversion) {
5286                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5287                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5288         }
5289 }
5290
5291 void
5292 clear_current_stateid(struct nfsd4_compound_state *cstate)
5293 {
5294         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5295 }
5296
5297 /*
5298  * functions to set current state id
5299  */
5300 void
5301 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5302 {
5303         put_stateid(cstate, &odp->od_stateid);
5304 }
5305
5306 void
5307 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5308 {
5309         put_stateid(cstate, &open->op_stateid);
5310 }
5311
5312 void
5313 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5314 {
5315         put_stateid(cstate, &close->cl_stateid);
5316 }
5317
5318 void
5319 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5320 {
5321         put_stateid(cstate, &lock->lk_resp_stateid);
5322 }
5323
5324 /*
5325  * functions to consume current state id
5326  */
5327
5328 void
5329 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5330 {
5331         get_stateid(cstate, &odp->od_stateid);
5332 }
5333
5334 void
5335 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5336 {
5337         get_stateid(cstate, &drp->dr_stateid);
5338 }
5339
5340 void
5341 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5342 {
5343         get_stateid(cstate, &fsp->fr_stateid);
5344 }
5345
5346 void
5347 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5348 {
5349         get_stateid(cstate, &setattr->sa_stateid);
5350 }
5351
5352 void
5353 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5354 {
5355         get_stateid(cstate, &close->cl_stateid);
5356 }
5357
5358 void
5359 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5360 {
5361         get_stateid(cstate, &locku->lu_stateid);
5362 }
5363
5364 void
5365 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5366 {
5367         get_stateid(cstate, &read->rd_stateid);
5368 }
5369
5370 void
5371 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5372 {
5373         get_stateid(cstate, &write->wr_stateid);
5374 }