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 "xdr4.h"
  45 #include "vfs.h"
  46 #include "current_stateid.h"
  47
  48 #include "netns.h"
  49
  50 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  51
  52 #define all_ones {{~0,~0},~0}
  53 static const stateid_t one_stateid = {
  54         .si_generation = ~0,
  55         .si_opaque = all_ones,
  56 };
  57 static const stateid_t zero_stateid = {
  58         /* all fields zero */
  59 };
  60 static const stateid_t currentstateid = {
  61         .si_generation = 1,
  62 };
  63
  64 static u64 current_sessionid = 1;
  65
  66 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  67 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  68 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  69
  70 /* forward declarations */
  71 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  72
  73 /* Locking: */
  74
  75 /* Currently used for almost all code touching nfsv4 state: */
  76 static DEFINE_MUTEX(client_mutex);
  77
  78 /*
  79  * Currently used for the del_recall_lru and file hash table.  In an
  80  * effort to decrease the scope of the client_mutex, this spinlock may
  81  * eventually cover more:
  82  */
  83 static DEFINE_SPINLOCK(recall_lock);
  84
  85 static struct kmem_cache *openowner_slab = NULL;
  86 static struct kmem_cache *lockowner_slab = NULL;
  87 static struct kmem_cache *file_slab = NULL;
  88 static struct kmem_cache *stateid_slab = NULL;
  89 static struct kmem_cache *deleg_slab = NULL;
  90
  91 void
  92 nfs4_lock_state(void)
  93 {
  94         mutex_lock(&client_mutex);
  95 }
  96
  97 static void free_session(struct kref *);
  98
  99 /* Must be called under the client_lock */
 100 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 101 {
 102         kref_put(&ses->se_ref, free_session);
 103 }
 104
 105 static void nfsd4_get_session(struct nfsd4_session *ses)
 106 {
 107         kref_get(&ses->se_ref);
 108 }
 109
 110 void
 111 nfs4_unlock_state(void)
 112 {
 113         mutex_unlock(&client_mutex);
 114 }
 115
 116 static inline u32
 117 opaque_hashval(const void *ptr, int nbytes)
 118 {
 119         unsigned char *cptr = (unsigned char *) ptr;
 120
 121         u32 x = 0;
 122         while (nbytes--) {
 123                 x *= 37;
 124                 x += *cptr++;
 125         }
 126         return x;
 127 }
 128
 129 static struct list_head del_recall_lru;
 130
 131 static void nfsd4_free_file(struct nfs4_file *f)
 132 {
 133         kmem_cache_free(file_slab, f);
 134 }
 135
 136 static inline void
 137 put_nfs4_file(struct nfs4_file *fi)
 138 {
 139         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
 140                 list_del(&fi->fi_hash);
 141                 spin_unlock(&recall_lock);
 142                 iput(fi->fi_inode);
 143                 nfsd4_free_file(fi);
 144         }
 145 }
 146
 147 static inline void
 148 get_nfs4_file(struct nfs4_file *fi)
 149 {
 150         atomic_inc(&fi->fi_ref);
 151 }
 152
 153 static int num_delegations;
 154 unsigned long max_delegations;
 155
 156 /*
 157  * Open owner state (share locks)
 158  */
 159
 160 /* hash tables for lock and open owners */
 161 #define OWNER_HASH_BITS              8
 162 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 163 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 164
 165 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 166 {
 167         unsigned int ret;
 168
 169         ret = opaque_hashval(ownername->data, ownername->len);
 170         ret += clientid;
 171         return ret & OWNER_HASH_MASK;
 172 }
 173
 174 /* hash table for nfs4_file */
 175 #define FILE_HASH_BITS                   8
 176 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 177
 178 static unsigned int file_hashval(struct inode *ino)
 179 {
 180         /* XXX: why are we hashing on inode pointer, anyway? */
 181         return hash_ptr(ino, FILE_HASH_BITS);
 182 }
 183
 184 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 185
 186 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 187 {
 188         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 189         atomic_inc(&fp->fi_access[oflag]);
 190 }
 191
 192 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 193 {
 194         if (oflag == O_RDWR) {
 195                 __nfs4_file_get_access(fp, O_RDONLY);
 196                 __nfs4_file_get_access(fp, O_WRONLY);
 197         } else
 198                 __nfs4_file_get_access(fp, oflag);
 199 }
 200
 201 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 202 {
 203         if (fp->fi_fds[oflag]) {
 204                 fput(fp->fi_fds[oflag]);
 205                 fp->fi_fds[oflag] = NULL;
 206         }
 207 }
 208
 209 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 210 {
 211         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 212                 nfs4_file_put_fd(fp, oflag);
 213                 /*
 214                  * It's also safe to get rid of the RDWR open *if*
 215                  * we no longer have need of the other kind of access
 216                  * or if we already have the other kind of open:
 217                  */
 218                 if (fp->fi_fds[1-oflag]
 219                         || atomic_read(&fp->fi_access[1 - oflag]) == 0)
 220                         nfs4_file_put_fd(fp, O_RDWR);
 221         }
 222 }
 223
 224 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 225 {
 226         if (oflag == O_RDWR) {
 227                 __nfs4_file_put_access(fp, O_RDONLY);
 228                 __nfs4_file_put_access(fp, O_WRONLY);
 229         } else
 230                 __nfs4_file_put_access(fp, oflag);
 231 }
 232
 233 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
 234 kmem_cache *slab)
 235 {
 236         struct idr *stateids = &cl->cl_stateids;
 237         static int min_stateid = 0;
 238         struct nfs4_stid *stid;
 239         int new_id;
 240
 241         stid = kmem_cache_alloc(slab, GFP_KERNEL);
 242         if (!stid)
 243                 return NULL;
 244
 245         new_id = idr_alloc(stateids, stid, min_stateid, 0, GFP_KERNEL);
 246         if (new_id < 0)
 247                 goto out_free;
 248         stid->sc_client = cl;
 249         stid->sc_type = 0;
 250         stid->sc_stateid.si_opaque.so_id = new_id;
 251         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 252         /* Will be incremented before return to client: */
 253         stid->sc_stateid.si_generation = 0;
 254
 255         /*
 256          * It shouldn't be a problem to reuse an opaque stateid value.
 257          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 258          * example, a stray write retransmission could be accepted by
 259          * the server when it should have been rejected.  Therefore,
 260          * adopt a trick from the sctp code to attempt to maximize the
 261          * amount of time until an id is reused, by ensuring they always
 262          * "increase" (mod INT_MAX):
 263          */
 264
 265         min_stateid = new_id+1;
 266         if (min_stateid == INT_MAX)
 267                 min_stateid = 0;
 268         return stid;
 269 out_free:
 270         kfree(stid);
 271         return NULL;
 272 }
 273
 274 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 275 {
 276         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 277 }
 278
 279 static struct nfs4_delegation *
 280 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
 281 {
 282         struct nfs4_delegation *dp;
 283         struct nfs4_file *fp = stp->st_file;
 284
 285         dprintk("NFSD alloc_init_deleg\n");
 286         /*
 287          * Major work on the lease subsystem (for example, to support
 288          * calbacks on stat) will be required before we can support
 289          * write delegations properly.
 290          */
 291         if (type != NFS4_OPEN_DELEGATE_READ)
 292                 return NULL;
 293         if (fp->fi_had_conflict)
 294                 return NULL;
 295         if (num_delegations > max_delegations)
 296                 return NULL;
 297         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 298         if (dp == NULL)
 299                 return dp;
 300         dp->dl_stid.sc_type = NFS4_DELEG_STID;
 301         /*
 302          * delegation seqid's are never incremented.  The 4.1 special
 303          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 304          * 0 anyway just for consistency and use 1:
 305          */
 306         dp->dl_stid.sc_stateid.si_generation = 1;
 307         num_delegations++;
 308         INIT_LIST_HEAD(&dp->dl_perfile);
 309         INIT_LIST_HEAD(&dp->dl_perclnt);
 310         INIT_LIST_HEAD(&dp->dl_recall_lru);
 311         get_nfs4_file(fp);
 312         dp->dl_file = fp;
 313         dp->dl_type = type;
 314         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 315         dp->dl_time = 0;
 316         atomic_set(&dp->dl_count, 1);
 317         nfsd4_init_callback(&dp->dl_recall);
 318         return dp;
 319 }
 320
 321 static void free_stid(struct nfs4_stid *s, struct kmem_cache *slab)
 322 {
 323         struct idr *stateids = &s->sc_client->cl_stateids;
 324
 325         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 326         kmem_cache_free(slab, s);
 327 }
 328
 329 void
 330 nfs4_put_delegation(struct nfs4_delegation *dp)
 331 {
 332         if (atomic_dec_and_test(&dp->dl_count)) {
 333                 dprintk("NFSD: freeing dp %p\n",dp);
 334                 put_nfs4_file(dp->dl_file);
 335                 free_stid(&dp->dl_stid, deleg_slab);
 336                 num_delegations--;
 337         }
 338 }
 339
 340 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 341 {
 342         if (atomic_dec_and_test(&fp->fi_delegees)) {
 343                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 344                 fp->fi_lease = NULL;
 345                 fput(fp->fi_deleg_file);
 346                 fp->fi_deleg_file = NULL;
 347         }
 348 }
 349
 350 static void unhash_stid(struct nfs4_stid *s)
 351 {
 352         s->sc_type = 0;
 353 }
 354
 355 /* Called under the state lock. */
 356 static void
 357 unhash_delegation(struct nfs4_delegation *dp)
 358 {
 359         unhash_stid(&dp->dl_stid);
 360         list_del_init(&dp->dl_perclnt);
 361         spin_lock(&recall_lock);
 362         list_del_init(&dp->dl_perfile);
 363         list_del_init(&dp->dl_recall_lru);
 364         spin_unlock(&recall_lock);
 365         nfs4_put_deleg_lease(dp->dl_file);
 366         nfs4_put_delegation(dp);
 367 }
 368
 369 /*
 370  * SETCLIENTID state
 371  */
 372
 373 static unsigned int clientid_hashval(u32 id)
 374 {
 375         return id & CLIENT_HASH_MASK;
 376 }
 377
 378 static unsigned int clientstr_hashval(const char *name)
 379 {
 380         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 381 }
 382
 383 /*
 384  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 385  * st_{access,deny}_bmap field of the stateid, in order to track not
 386  * only what share bits are currently in force, but also what
 387  * combinations of share bits previous opens have used.  This allows us
 388  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 389  * return an error if the client attempt to downgrade to a combination
 390  * of share bits not explicable by closing some of its previous opens.
 391  *
 392  * XXX: This enforcement is actually incomplete, since we don't keep
 393  * track of access/deny bit combinations; so, e.g., we allow:
 394  *
 395  *      OPEN allow read, deny write
 396  *      OPEN allow both, deny none
 397  *      DOWNGRADE allow read, deny none
 398  *
 399  * which we should reject.
 400  */
 401 static unsigned int
 402 bmap_to_share_mode(unsigned long bmap) {
 403         int i;
 404         unsigned int access = 0;
 405
 406         for (i = 1; i < 4; i++) {
 407                 if (test_bit(i, &bmap))
 408                         access |= i;
 409         }
 410         return access;
 411 }
 412
 413 static bool
 414 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 415         unsigned int access, deny;
 416
 417         access = bmap_to_share_mode(stp->st_access_bmap);
 418         deny = bmap_to_share_mode(stp->st_deny_bmap);
 419         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 420                 return false;
 421         return true;
 422 }
 423
 424 /* set share access for a given stateid */
 425 static inline void
 426 set_access(u32 access, struct nfs4_ol_stateid *stp)
 427 {
 428         __set_bit(access, &stp->st_access_bmap);
 429 }
 430
 431 /* clear share access for a given stateid */
 432 static inline void
 433 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 434 {
 435         __clear_bit(access, &stp->st_access_bmap);
 436 }
 437
 438 /* test whether a given stateid has access */
 439 static inline bool
 440 test_access(u32 access, struct nfs4_ol_stateid *stp)
 441 {
 442         return test_bit(access, &stp->st_access_bmap);
 443 }
 444
 445 /* set share deny for a given stateid */
 446 static inline void
 447 set_deny(u32 access, struct nfs4_ol_stateid *stp)
 448 {
 449         __set_bit(access, &stp->st_deny_bmap);
 450 }
 451
 452 /* clear share deny for a given stateid */
 453 static inline void
 454 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 455 {
 456         __clear_bit(access, &stp->st_deny_bmap);
 457 }
 458
 459 /* test whether a given stateid is denying specific access */
 460 static inline bool
 461 test_deny(u32 access, struct nfs4_ol_stateid *stp)
 462 {
 463         return test_bit(access, &stp->st_deny_bmap);
 464 }
 465
 466 static int nfs4_access_to_omode(u32 access)
 467 {
 468         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 469         case NFS4_SHARE_ACCESS_READ:
 470                 return O_RDONLY;
 471         case NFS4_SHARE_ACCESS_WRITE:
 472                 return O_WRONLY;
 473         case NFS4_SHARE_ACCESS_BOTH:
 474                 return O_RDWR;
 475         }
 476         WARN_ON_ONCE(1);
 477         return O_RDONLY;
 478 }
 479
 480 /* release all access and file references for a given stateid */
 481 static void
 482 release_all_access(struct nfs4_ol_stateid *stp)
 483 {
 484         int i;
 485
 486         for (i = 1; i < 4; i++) {
 487                 if (test_access(i, stp))
 488                         nfs4_file_put_access(stp->st_file,
 489                                              nfs4_access_to_omode(i));
 490                 clear_access(i, stp);
 491         }
 492 }
 493
 494 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 495 {
 496         list_del(&stp->st_perfile);
 497         list_del(&stp->st_perstateowner);
 498 }
 499
 500 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 501 {
 502         release_all_access(stp);
 503         put_nfs4_file(stp->st_file);
 504         stp->st_file = NULL;
 505 }
 506
 507 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 508 {
 509         free_stid(&stp->st_stid, stateid_slab);
 510 }
 511
 512 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 513 {
 514         struct file *file;
 515
 516         unhash_generic_stateid(stp);
 517         unhash_stid(&stp->st_stid);
 518         file = find_any_file(stp->st_file);
 519         if (file)
 520                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 521         close_generic_stateid(stp);
 522         free_generic_stateid(stp);
 523 }
 524
 525 static void unhash_lockowner(struct nfs4_lockowner *lo)
 526 {
 527         struct nfs4_ol_stateid *stp;
 528
 529         list_del(&lo->lo_owner.so_strhash);
 530         list_del(&lo->lo_perstateid);
 531         list_del(&lo->lo_owner_ino_hash);
 532         while (!list_empty(&lo->lo_owner.so_stateids)) {
 533                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 534                                 struct nfs4_ol_stateid, st_perstateowner);
 535                 release_lock_stateid(stp);
 536         }
 537 }
 538
 539 static void release_lockowner(struct nfs4_lockowner *lo)
 540 {
 541         unhash_lockowner(lo);
 542         nfs4_free_lockowner(lo);
 543 }
 544
 545 static void
 546 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 547 {
 548         struct nfs4_lockowner *lo;
 549
 550         while (!list_empty(&open_stp->st_lockowners)) {
 551                 lo = list_entry(open_stp->st_lockowners.next,
 552                                 struct nfs4_lockowner, lo_perstateid);
 553                 release_lockowner(lo);
 554         }
 555 }
 556
 557 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 558 {
 559         unhash_generic_stateid(stp);
 560         release_stateid_lockowners(stp);
 561         close_generic_stateid(stp);
 562 }
 563
 564 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 565 {
 566         unhash_open_stateid(stp);
 567         unhash_stid(&stp->st_stid);
 568         free_generic_stateid(stp);
 569 }
 570
 571 static void unhash_openowner(struct nfs4_openowner *oo)
 572 {
 573         struct nfs4_ol_stateid *stp;
 574
 575         list_del(&oo->oo_owner.so_strhash);
 576         list_del(&oo->oo_perclient);
 577         while (!list_empty(&oo->oo_owner.so_stateids)) {
 578                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 579                                 struct nfs4_ol_stateid, st_perstateowner);
 580                 release_open_stateid(stp);
 581         }
 582 }
 583
 584 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 585 {
 586         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 587
 588         if (s) {
 589                 unhash_stid(&s->st_stid);
 590                 free_generic_stateid(s);
 591                 oo->oo_last_closed_stid = NULL;
 592         }
 593 }
 594
 595 static void release_openowner(struct nfs4_openowner *oo)
 596 {
 597         unhash_openowner(oo);
 598         list_del(&oo->oo_close_lru);
 599         release_last_closed_stateid(oo);
 600         nfs4_free_openowner(oo);
 601 }
 602
 603 static inline int
 604 hash_sessionid(struct nfs4_sessionid *sessionid)
 605 {
 606         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 607
 608         return sid->sequence % SESSION_HASH_SIZE;
 609 }
 610
 611 #ifdef NFSD_DEBUG
 612 static inline void
 613 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 614 {
 615         u32 *ptr = (u32 *)(&sessionid->data[0]);
 616         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 617 }
 618 #else
 619 static inline void
 620 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 621 {
 622 }
 623 #endif
 624
 625
 626 static void
 627 gen_sessionid(struct nfsd4_session *ses)
 628 {
 629         struct nfs4_client *clp = ses->se_client;
 630         struct nfsd4_sessionid *sid;
 631
 632         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 633         sid->clientid = clp->cl_clientid;
 634         sid->sequence = current_sessionid++;
 635         sid->reserved = 0;
 636 }
 637
 638 /*
 639  * The protocol defines ca_maxresponssize_cached to include the size of
 640  * the rpc header, but all we need to cache is the data starting after
 641  * the end of the initial SEQUENCE operation--the rest we regenerate
 642  * each time.  Therefore we can advertise a ca_maxresponssize_cached
 643  * value that is the number of bytes in our cache plus a few additional
 644  * bytes.  In order to stay on the safe side, and not promise more than
 645  * we can cache, those additional bytes must be the minimum possible: 24
 646  * bytes of rpc header (xid through accept state, with AUTH_NULL
 647  * verifier), 12 for the compound header (with zero-length tag), and 44
 648  * for the SEQUENCE op response:
 649  */
 650 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 651
 652 static void
 653 free_session_slots(struct nfsd4_session *ses)
 654 {
 655         int i;
 656
 657         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 658                 kfree(ses->se_slots[i]);
 659 }
 660
 661 /*
 662  * We don't actually need to cache the rpc and session headers, so we
 663  * can allocate a little less for each slot:
 664  */
 665 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
 666 {
 667         return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 668 }
 669
 670 static int nfsd4_sanitize_slot_size(u32 size)
 671 {
 672         size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
 673         size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
 674
 675         return size;
 676 }
 677
 678 /*
 679  * XXX: If we run out of reserved DRC memory we could (up to a point)
 680  * re-negotiate active sessions and reduce their slot usage to make
 681  * room for new connections. For now we just fail the create session.
 682  */
 683 static int nfsd4_get_drc_mem(int slotsize, u32 num)
 684 {
 685         int avail;
 686
 687         num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
 688
 689         spin_lock(&nfsd_drc_lock);
 690         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
 691                     nfsd_drc_max_mem - nfsd_drc_mem_used);
 692         num = min_t(int, num, avail / slotsize);
 693         nfsd_drc_mem_used += num * slotsize;
 694         spin_unlock(&nfsd_drc_lock);
 695
 696         return num;
 697 }
 698
 699 static void nfsd4_put_drc_mem(int slotsize, int num)
 700 {
 701         spin_lock(&nfsd_drc_lock);
 702         nfsd_drc_mem_used -= slotsize * num;
 703         spin_unlock(&nfsd_drc_lock);
 704 }
 705
 706 static struct nfsd4_session *__alloc_session(int slotsize, int numslots)
 707 {
 708         struct nfsd4_session *new;
 709         int mem, i;
 710
 711         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 712                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
 713         mem = numslots * sizeof(struct nfsd4_slot *);
 714
 715         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 716         if (!new)
 717                 return NULL;
 718         /* allocate each struct nfsd4_slot and data cache in one piece */
 719         for (i = 0; i < numslots; i++) {
 720                 mem = sizeof(struct nfsd4_slot) + slotsize;
 721                 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
 722                 if (!new->se_slots[i])
 723                         goto out_free;
 724         }
 725         return new;
 726 out_free:
 727         while (i--)
 728                 kfree(new->se_slots[i]);
 729         kfree(new);
 730         return NULL;
 731 }
 732
 733 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new,
 734                                    struct nfsd4_channel_attrs *req,
 735                                    int numslots, int slotsize,
 736                                    struct nfsd_net *nn)
 737 {
 738         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
 739
 740         new->maxreqs = numslots;
 741         new->maxresp_cached = min_t(u32, req->maxresp_cached,
 742                                         slotsize + NFSD_MIN_HDR_SEQ_SZ);
 743         new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
 744         new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
 745         new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
 746 }
 747
 748 static void free_conn(struct nfsd4_conn *c)
 749 {
 750         svc_xprt_put(c->cn_xprt);
 751         kfree(c);
 752 }
 753
 754 static void nfsd4_conn_lost(struct svc_xpt_user *u)
 755 {
 756         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 757         struct nfs4_client *clp = c->cn_session->se_client;
 758
 759         spin_lock(&clp->cl_lock);
 760         if (!list_empty(&c->cn_persession)) {
 761                 list_del(&c->cn_persession);
 762                 free_conn(c);
 763         }
 764         nfsd4_probe_callback(clp);
 765         spin_unlock(&clp->cl_lock);
 766 }
 767
 768 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 769 {
 770         struct nfsd4_conn *conn;
 771
 772         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 773         if (!conn)
 774                 return NULL;
 775         svc_xprt_get(rqstp->rq_xprt);
 776         conn->cn_xprt = rqstp->rq_xprt;
 777         conn->cn_flags = flags;
 778         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
 779         return conn;
 780 }
 781
 782 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 783 {
 784         conn->cn_session = ses;
 785         list_add(&conn->cn_persession, &ses->se_conns);
 786 }
 787
 788 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 789 {
 790         struct nfs4_client *clp = ses->se_client;
 791
 792         spin_lock(&clp->cl_lock);
 793         __nfsd4_hash_conn(conn, ses);
 794         spin_unlock(&clp->cl_lock);
 795 }
 796
 797 static int nfsd4_register_conn(struct nfsd4_conn *conn)
 798 {
 799         conn->cn_xpt_user.callback = nfsd4_conn_lost;
 800         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
 801 }
 802
 803 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
 804 {
 805         int ret;
 806
 807         nfsd4_hash_conn(conn, ses);
 808         ret = nfsd4_register_conn(conn);
 809         if (ret)
 810                 /* oops; xprt is already down: */
 811                 nfsd4_conn_lost(&conn->cn_xpt_user);
 812         if (conn->cn_flags & NFS4_CDFC4_BACK) {
 813                 /* callback channel may be back up */
 814                 nfsd4_probe_callback(ses->se_client);
 815         }
 816 }
 817
 818 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
 819 {
 820         u32 dir = NFS4_CDFC4_FORE;
 821
 822         if (cses->flags & SESSION4_BACK_CHAN)
 823                 dir |= NFS4_CDFC4_BACK;
 824         return alloc_conn(rqstp, dir);
 825 }
 826
 827 /* must be called under client_lock */
 828 static void nfsd4_del_conns(struct nfsd4_session *s)
 829 {
 830         struct nfs4_client *clp = s->se_client;
 831         struct nfsd4_conn *c;
 832
 833         spin_lock(&clp->cl_lock);
 834         while (!list_empty(&s->se_conns)) {
 835                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
 836                 list_del_init(&c->cn_persession);
 837                 spin_unlock(&clp->cl_lock);
 838
 839                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
 840                 free_conn(c);
 841
 842                 spin_lock(&clp->cl_lock);
 843         }
 844         spin_unlock(&clp->cl_lock);
 845 }
 846
 847 static void __free_session(struct nfsd4_session *ses)
 848 {
 849         nfsd4_put_drc_mem(slot_bytes(&ses->se_fchannel), ses->se_fchannel.maxreqs);
 850         free_session_slots(ses);
 851         kfree(ses);
 852 }
 853
 854 static void free_session(struct kref *kref)
 855 {
 856         struct nfsd4_session *ses;
 857         struct nfsd_net *nn;
 858
 859         ses = container_of(kref, struct nfsd4_session, se_ref);
 860         nn = net_generic(ses->se_client->net, nfsd_net_id);
 861
 862         lockdep_assert_held(&nn->client_lock);
 863         nfsd4_del_conns(ses);
 864         __free_session(ses);
 865 }
 866
 867 static void nfsd4_put_session(struct nfsd4_session *ses)
 868 {
 869         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
 870
 871         spin_lock(&nn->client_lock);
 872         nfsd4_put_session_locked(ses);
 873         spin_unlock(&nn->client_lock);
 874 }
 875
 876 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan,
 877                                            struct nfsd_net *nn)
 878 {
 879         struct nfsd4_session *new;
 880         int numslots, slotsize;
 881         /*
 882          * Note decreasing slot size below client's request may
 883          * make it difficult for client to function correctly, whereas
 884          * decreasing the number of slots will (just?) affect
 885          * performance.  When short on memory we therefore prefer to
 886          * decrease number of slots instead of their size.
 887          */
 888         slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
 889         numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
 890         if (numslots < 1)
 891                 return NULL;
 892
 893         new = __alloc_session(slotsize, numslots);
 894         if (!new) {
 895                 nfsd4_put_drc_mem(slotsize, numslots);
 896                 return NULL;
 897         }
 898         init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize, nn);
 899         return new;
 900 }
 901
 902 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 903 {
 904         int idx;
 905         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 906
 907         new->se_client = clp;
 908         gen_sessionid(new);
 909
 910         INIT_LIST_HEAD(&new->se_conns);
 911
 912         new->se_cb_seq_nr = 1;
 913         new->se_flags = cses->flags;
 914         new->se_cb_prog = cses->callback_prog;
 915         new->se_cb_sec = cses->cb_sec;
 916         kref_init(&new->se_ref);
 917         idx = hash_sessionid(&new->se_sessionid);
 918         spin_lock(&nn->client_lock);
 919         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
 920         spin_lock(&clp->cl_lock);
 921         list_add(&new->se_perclnt, &clp->cl_sessions);
 922         spin_unlock(&clp->cl_lock);
 923         spin_unlock(&nn->client_lock);
 924
 925         if (cses->flags & SESSION4_BACK_CHAN) {
 926                 struct sockaddr *sa = svc_addr(rqstp);
 927                 /*
 928                  * This is a little silly; with sessions there's no real
 929                  * use for the callback address.  Use the peer address
 930                  * as a reasonable default for now, but consider fixing
 931                  * the rpc client not to require an address in the
 932                  * future:
 933                  */
 934                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
 935                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
 936         }
 937 }
 938
 939 /* caller must hold client_lock */
 940 static struct nfsd4_session *
 941 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
 942 {
 943         struct nfsd4_session *elem;
 944         int idx;
 945         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 946
 947         dump_sessionid(__func__, sessionid);
 948         idx = hash_sessionid(sessionid);
 949         /* Search in the appropriate list */
 950         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
 951                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
 952                             NFS4_MAX_SESSIONID_LEN)) {
 953                         return elem;
 954                 }
 955         }
 956
 957         dprintk("%s: session not found\n", __func__);
 958         return NULL;
 959 }
 960
 961 /* caller must hold client_lock */
 962 static void
 963 unhash_session(struct nfsd4_session *ses)
 964 {
 965         list_del(&ses->se_hash);
 966         spin_lock(&ses->se_client->cl_lock);
 967         list_del(&ses->se_perclnt);
 968         spin_unlock(&ses->se_client->cl_lock);
 969 }
 970
 971 /* must be called under the client_lock */
 972 static inline void
 973 renew_client_locked(struct nfs4_client *clp)
 974 {
 975         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 976
 977         if (is_client_expired(clp)) {
 978                 WARN_ON(1);
 979                 printk("%s: client (clientid %08x/%08x) already expired\n",
 980                         __func__,
 981                         clp->cl_clientid.cl_boot,
 982                         clp->cl_clientid.cl_id);
 983                 return;
 984         }
 985
 986         dprintk("renewing client (clientid %08x/%08x)\n",
 987                         clp->cl_clientid.cl_boot,
 988                         clp->cl_clientid.cl_id);
 989         list_move_tail(&clp->cl_lru, &nn->client_lru);
 990         clp->cl_time = get_seconds();
 991 }
 992
 993 static inline void
 994 renew_client(struct nfs4_client *clp)
 995 {
 996         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 997
 998         spin_lock(&nn->client_lock);
 999         renew_client_locked(clp);
1000         spin_unlock(&nn->client_lock);
1001 }
1002
1003 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1004 static int
1005 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1006 {
1007         if (clid->cl_boot == nn->boot_time)
1008                 return 0;
1009         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1010                 clid->cl_boot, clid->cl_id, nn->boot_time);
1011         return 1;
1012 }
1013
1014 /*
1015  * XXX Should we use a slab cache ?
1016  * This type of memory management is somewhat inefficient, but we use it
1017  * anyway since SETCLIENTID is not a common operation.
1018  */
1019 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1020 {
1021         struct nfs4_client *clp;
1022
1023         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1024         if (clp == NULL)
1025                 return NULL;
1026         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1027         if (clp->cl_name.data == NULL) {
1028                 kfree(clp);
1029                 return NULL;
1030         }
1031         clp->cl_name.len = name.len;
1032         return clp;
1033 }
1034
1035 static inline void
1036 free_client(struct nfs4_client *clp)
1037 {
1038         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1039
1040         lockdep_assert_held(&nn->client_lock);
1041         while (!list_empty(&clp->cl_sessions)) {
1042                 struct nfsd4_session *ses;
1043                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1044                                 se_perclnt);
1045                 list_del(&ses->se_perclnt);
1046                 nfsd4_put_session_locked(ses);
1047         }
1048         free_svc_cred(&clp->cl_cred);
1049         kfree(clp->cl_name.data);
1050         idr_destroy(&clp->cl_stateids);
1051         kfree(clp);
1052 }
1053
1054 void
1055 release_session_client(struct nfsd4_session *session)
1056 {
1057         struct nfs4_client *clp = session->se_client;
1058         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1059
1060         nfsd4_put_session(session);
1061         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
1062                 return;
1063         /*
1064          * At this point we also know all sessions have refcnt 1,
1065          * so free_client will delete them all if necessary:
1066          */
1067         if (is_client_expired(clp))
1068                 free_client(clp);
1069         else
1070                 renew_client_locked(clp);
1071         spin_unlock(&nn->client_lock);
1072 }
1073
1074 /* must be called under the client_lock */
1075 static inline void
1076 unhash_client_locked(struct nfs4_client *clp)
1077 {
1078         struct nfsd4_session *ses;
1079
1080         mark_client_expired(clp);
1081         list_del(&clp->cl_lru);
1082         spin_lock(&clp->cl_lock);
1083         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1084                 list_del_init(&ses->se_hash);
1085         spin_unlock(&clp->cl_lock);
1086 }
1087
1088 static void
1089 destroy_client(struct nfs4_client *clp)
1090 {
1091         struct nfs4_openowner *oo;
1092         struct nfs4_delegation *dp;
1093         struct list_head reaplist;
1094         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1095
1096         INIT_LIST_HEAD(&reaplist);
1097         spin_lock(&recall_lock);
1098         while (!list_empty(&clp->cl_delegations)) {
1099                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1100                 list_del_init(&dp->dl_perclnt);
1101                 list_move(&dp->dl_recall_lru, &reaplist);
1102         }
1103         spin_unlock(&recall_lock);
1104         while (!list_empty(&reaplist)) {
1105                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1106                 unhash_delegation(dp);
1107         }
1108         while (!list_empty(&clp->cl_openowners)) {
1109                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1110                 release_openowner(oo);
1111         }
1112         nfsd4_shutdown_callback(clp);
1113         if (clp->cl_cb_conn.cb_xprt)
1114                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1115         list_del(&clp->cl_idhash);
1116         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1117                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1118         else
1119                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1120         spin_lock(&nn->client_lock);
1121         unhash_client_locked(clp);
1122         if (atomic_read(&clp->cl_refcount) == 0)
1123                 free_client(clp);
1124         spin_unlock(&nn->client_lock);
1125 }
1126
1127 static void expire_client(struct nfs4_client *clp)
1128 {
1129         nfsd4_client_record_remove(clp);
1130         destroy_client(clp);
1131 }
1132
1133 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1134 {
1135         memcpy(target->cl_verifier.data, source->data,
1136                         sizeof(target->cl_verifier.data));
1137 }
1138
1139 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1140 {
1141         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1142         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1143 }
1144
1145 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1146 {
1147         if (source->cr_principal) {
1148                 target->cr_principal =
1149                                 kstrdup(source->cr_principal, GFP_KERNEL);
1150                 if (target->cr_principal == NULL)
1151                         return -ENOMEM;
1152         } else
1153                 target->cr_principal = NULL;
1154         target->cr_flavor = source->cr_flavor;
1155         target->cr_uid = source->cr_uid;
1156         target->cr_gid = source->cr_gid;
1157         target->cr_group_info = source->cr_group_info;
1158         get_group_info(target->cr_group_info);
1159         return 0;
1160 }
1161
1162 static long long
1163 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1164 {
1165         long long res;
1166
1167         res = o1->len - o2->len;
1168         if (res)
1169                 return res;
1170         return (long long)memcmp(o1->data, o2->data, o1->len);
1171 }
1172
1173 static int same_name(const char *n1, const char *n2)
1174 {
1175         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1176 }
1177
1178 static int
1179 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1180 {
1181         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1182 }
1183
1184 static int
1185 same_clid(clientid_t *cl1, clientid_t *cl2)
1186 {
1187         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1188 }
1189
1190 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1191 {
1192         int i;
1193
1194         if (g1->ngroups != g2->ngroups)
1195                 return false;
1196         for (i=0; i<g1->ngroups; i++)
1197                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1198                         return false;
1199         return true;
1200 }
1201
1202 /*
1203  * RFC 3530 language requires clid_inuse be returned when the
1204  * "principal" associated with a requests differs from that previously
1205  * used.  We use uid, gid's, and gss principal string as our best
1206  * approximation.  We also don't want to allow non-gss use of a client
1207  * established using gss: in theory cr_principal should catch that
1208  * change, but in practice cr_principal can be null even in the gss case
1209  * since gssd doesn't always pass down a principal string.
1210  */
1211 static bool is_gss_cred(struct svc_cred *cr)
1212 {
1213         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1214         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1215 }
1216
1217
1218 static bool
1219 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1220 {
1221         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1222                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1223                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1224                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1225                 return false;
1226         if (cr1->cr_principal == cr2->cr_principal)
1227                 return true;
1228         if (!cr1->cr_principal || !cr2->cr_principal)
1229                 return false;
1230         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1231 }
1232
1233 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1234 {
1235         static u32 current_clientid = 1;
1236
1237         clp->cl_clientid.cl_boot = nn->boot_time;
1238         clp->cl_clientid.cl_id = current_clientid++;
1239 }
1240
1241 static void gen_confirm(struct nfs4_client *clp)
1242 {
1243         __be32 verf[2];
1244         static u32 i;
1245
1246         verf[0] = (__be32)get_seconds();
1247         verf[1] = (__be32)i++;
1248         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1249 }
1250
1251 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1252 {
1253         struct nfs4_stid *ret;
1254
1255         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1256         if (!ret || !ret->sc_type)
1257                 return NULL;
1258         return ret;
1259 }
1260
1261 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1262 {
1263         struct nfs4_stid *s;
1264
1265         s = find_stateid(cl, t);
1266         if (!s)
1267                 return NULL;
1268         if (typemask & s->sc_type)
1269                 return s;
1270         return NULL;
1271 }
1272
1273 static struct nfs4_client *create_client(struct xdr_netobj name,
1274                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1275 {
1276         struct nfs4_client *clp;
1277         struct sockaddr *sa = svc_addr(rqstp);
1278         int ret;
1279         struct net *net = SVC_NET(rqstp);
1280         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1281
1282         clp = alloc_client(name);
1283         if (clp == NULL)
1284                 return NULL;
1285
1286         INIT_LIST_HEAD(&clp->cl_sessions);
1287         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1288         if (ret) {
1289                 spin_lock(&nn->client_lock);
1290                 free_client(clp);
1291                 spin_unlock(&nn->client_lock);
1292                 return NULL;
1293         }
1294         idr_init(&clp->cl_stateids);
1295         atomic_set(&clp->cl_refcount, 0);
1296         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1297         INIT_LIST_HEAD(&clp->cl_idhash);
1298         INIT_LIST_HEAD(&clp->cl_openowners);
1299         INIT_LIST_HEAD(&clp->cl_delegations);
1300         INIT_LIST_HEAD(&clp->cl_lru);
1301         INIT_LIST_HEAD(&clp->cl_callbacks);
1302         spin_lock_init(&clp->cl_lock);
1303         nfsd4_init_callback(&clp->cl_cb_null);
1304         clp->cl_time = get_seconds();
1305         clear_bit(0, &clp->cl_cb_slot_busy);
1306         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1307         copy_verf(clp, verf);
1308         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1309         gen_confirm(clp);
1310         clp->cl_cb_session = NULL;
1311         clp->net = net;
1312         return clp;
1313 }
1314
1315 static void
1316 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1317 {
1318         struct rb_node **new = &(root->rb_node), *parent = NULL;
1319         struct nfs4_client *clp;
1320
1321         while (*new) {
1322                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1323                 parent = *new;
1324
1325                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1326                         new = &((*new)->rb_left);
1327                 else
1328                         new = &((*new)->rb_right);
1329         }
1330
1331         rb_link_node(&new_clp->cl_namenode, parent, new);
1332         rb_insert_color(&new_clp->cl_namenode, root);
1333 }
1334
1335 static struct nfs4_client *
1336 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1337 {
1338         long long cmp;
1339         struct rb_node *node = root->rb_node;
1340         struct nfs4_client *clp;
1341
1342         while (node) {
1343                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1344                 cmp = compare_blob(&clp->cl_name, name);
1345                 if (cmp > 0)
1346                         node = node->rb_left;
1347                 else if (cmp < 0)
1348                         node = node->rb_right;
1349                 else
1350                         return clp;
1351         }
1352         return NULL;
1353 }
1354
1355 static void
1356 add_to_unconfirmed(struct nfs4_client *clp)
1357 {
1358         unsigned int idhashval;
1359         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1360
1361         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1362         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1363         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1364         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1365         renew_client(clp);
1366 }
1367
1368 static void
1369 move_to_confirmed(struct nfs4_client *clp)
1370 {
1371         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1372         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1373
1374         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1375         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1376         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1377         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1378         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1379         renew_client(clp);
1380 }
1381
1382 static struct nfs4_client *
1383 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1384 {
1385         struct nfs4_client *clp;
1386         unsigned int idhashval = clientid_hashval(clid->cl_id);
1387
1388         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1389                 if (same_clid(&clp->cl_clientid, clid)) {
1390                         if ((bool)clp->cl_minorversion != sessions)
1391                                 return NULL;
1392                         renew_client(clp);
1393                         return clp;
1394                 }
1395         }
1396         return NULL;
1397 }
1398
1399 static struct nfs4_client *
1400 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1401 {
1402         struct list_head *tbl = nn->conf_id_hashtbl;
1403
1404         return find_client_in_id_table(tbl, clid, sessions);
1405 }
1406
1407 static struct nfs4_client *
1408 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1409 {
1410         struct list_head *tbl = nn->unconf_id_hashtbl;
1411
1412         return find_client_in_id_table(tbl, clid, sessions);
1413 }
1414
1415 static bool clp_used_exchangeid(struct nfs4_client *clp)
1416 {
1417         return clp->cl_exchange_flags != 0;
1418 }
1419
1420 static struct nfs4_client *
1421 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1422 {
1423         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1424 }
1425
1426 static struct nfs4_client *
1427 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1428 {
1429         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1430 }
1431
1432 static void
1433 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1434 {
1435         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1436         struct sockaddr *sa = svc_addr(rqstp);
1437         u32 scopeid = rpc_get_scope_id(sa);
1438         unsigned short expected_family;
1439
1440         /* Currently, we only support tcp and tcp6 for the callback channel */
1441         if (se->se_callback_netid_len == 3 &&
1442             !memcmp(se->se_callback_netid_val, "tcp", 3))
1443                 expected_family = AF_INET;
1444         else if (se->se_callback_netid_len == 4 &&
1445                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1446                 expected_family = AF_INET6;
1447         else
1448                 goto out_err;
1449
1450         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1451                                             se->se_callback_addr_len,
1452                                             (struct sockaddr *)&conn->cb_addr,
1453                                             sizeof(conn->cb_addr));
1454
1455         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1456                 goto out_err;
1457
1458         if (conn->cb_addr.ss_family == AF_INET6)
1459                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1460
1461         conn->cb_prog = se->se_callback_prog;
1462         conn->cb_ident = se->se_callback_ident;
1463         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1464         return;
1465 out_err:
1466         conn->cb_addr.ss_family = AF_UNSPEC;
1467         conn->cb_addrlen = 0;
1468         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1469                 "will not receive delegations\n",
1470                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1471
1472         return;
1473 }
1474
1475 /*
1476  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1477  */
1478 void
1479 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1480 {
1481         struct nfsd4_slot *slot = resp->cstate.slot;
1482         unsigned int base;
1483
1484         dprintk("--> %s slot %p\n", __func__, slot);
1485
1486         slot->sl_opcnt = resp->opcnt;
1487         slot->sl_status = resp->cstate.status;
1488
1489         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1490         if (nfsd4_not_cached(resp)) {
1491                 slot->sl_datalen = 0;
1492                 return;
1493         }
1494         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1495         base = (char *)resp->cstate.datap -
1496                                         (char *)resp->xbuf->head[0].iov_base;
1497         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1498                                     slot->sl_datalen))
1499                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1500         return;
1501 }
1502
1503 /*
1504  * Encode the replay sequence operation from the slot values.
1505  * If cachethis is FALSE encode the uncached rep error on the next
1506  * operation which sets resp->p and increments resp->opcnt for
1507  * nfs4svc_encode_compoundres.
1508  *
1509  */
1510 static __be32
1511 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1512                           struct nfsd4_compoundres *resp)
1513 {
1514         struct nfsd4_op *op;
1515         struct nfsd4_slot *slot = resp->cstate.slot;
1516
1517         /* Encode the replayed sequence operation */
1518         op = &args->ops[resp->opcnt - 1];
1519         nfsd4_encode_operation(resp, op);
1520
1521         /* Return nfserr_retry_uncached_rep in next operation. */
1522         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1523                 op = &args->ops[resp->opcnt++];
1524                 op->status = nfserr_retry_uncached_rep;
1525                 nfsd4_encode_operation(resp, op);
1526         }
1527         return op->status;
1528 }
1529
1530 /*
1531  * The sequence operation is not cached because we can use the slot and
1532  * session values.
1533  */
1534 __be32
1535 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1536                          struct nfsd4_sequence *seq)
1537 {
1538         struct nfsd4_slot *slot = resp->cstate.slot;
1539         __be32 status;
1540
1541         dprintk("--> %s slot %p\n", __func__, slot);
1542
1543         /* Either returns 0 or nfserr_retry_uncached */
1544         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1545         if (status == nfserr_retry_uncached_rep)
1546                 return status;
1547
1548         /* The sequence operation has been encoded, cstate->datap set. */
1549         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1550
1551         resp->opcnt = slot->sl_opcnt;
1552         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1553         status = slot->sl_status;
1554
1555         return status;
1556 }
1557
1558 /*
1559  * Set the exchange_id flags returned by the server.
1560  */
1561 static void
1562 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1563 {
1564         /* pNFS is not supported */
1565         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1566
1567         /* Referrals are supported, Migration is not. */
1568         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1569
1570         /* set the wire flags to return to client. */
1571         clid->flags = new->cl_exchange_flags;
1572 }
1573
1574 static bool client_has_state(struct nfs4_client *clp)
1575 {
1576         /*
1577          * Note clp->cl_openowners check isn't quite right: there's no
1578          * need to count owners without stateid's.
1579          *
1580          * Also note we should probably be using this in 4.0 case too.
1581          */
1582         return !list_empty(&clp->cl_openowners)
1583                 || !list_empty(&clp->cl_delegations)
1584                 || !list_empty(&clp->cl_sessions);
1585 }
1586
1587 __be32
1588 nfsd4_exchange_id(struct svc_rqst *rqstp,
1589                   struct nfsd4_compound_state *cstate,
1590                   struct nfsd4_exchange_id *exid)
1591 {
1592         struct nfs4_client *unconf, *conf, *new;
1593         __be32 status;
1594         char                    addr_str[INET6_ADDRSTRLEN];
1595         nfs4_verifier           verf = exid->verifier;
1596         struct sockaddr         *sa = svc_addr(rqstp);
1597         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1598         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1599
1600         rpc_ntop(sa, addr_str, sizeof(addr_str));
1601         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1602                 "ip_addr=%s flags %x, spa_how %d\n",
1603                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1604                 addr_str, exid->flags, exid->spa_how);
1605
1606         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1607                 return nfserr_inval;
1608
1609         /* Currently only support SP4_NONE */
1610         switch (exid->spa_how) {
1611         case SP4_NONE:
1612                 break;
1613         default:                                /* checked by xdr code */
1614                 WARN_ON_ONCE(1);
1615         case SP4_SSV:
1616         case SP4_MACH_CRED:
1617                 return nfserr_serverfault;      /* no excuse :-/ */
1618         }
1619
1620         /* Cases below refer to rfc 5661 section 18.35.4: */
1621         nfs4_lock_state();
1622         conf = find_confirmed_client_by_name(&exid->clname, nn);
1623         if (conf) {
1624                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1625                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1626
1627                 if (update) {
1628                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1629                                 status = nfserr_inval;
1630                                 goto out;
1631                         }
1632                         if (!creds_match) { /* case 9 */
1633                                 status = nfserr_perm;
1634                                 goto out;
1635                         }
1636                         if (!verfs_match) { /* case 8 */
1637                                 status = nfserr_not_same;
1638                                 goto out;
1639                         }
1640                         /* case 6 */
1641                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1642                         new = conf;
1643                         goto out_copy;
1644                 }
1645                 if (!creds_match) { /* case 3 */
1646                         if (client_has_state(conf)) {
1647                                 status = nfserr_clid_inuse;
1648                                 goto out;
1649                         }
1650                         expire_client(conf);
1651                         goto out_new;
1652                 }
1653                 if (verfs_match) { /* case 2 */
1654                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1655                         new = conf;
1656                         goto out_copy;
1657                 }
1658                 /* case 5, client reboot */
1659                 goto out_new;
1660         }
1661
1662         if (update) { /* case 7 */
1663                 status = nfserr_noent;
1664                 goto out;
1665         }
1666
1667         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1668         if (unconf) /* case 4, possible retry or client restart */
1669                 expire_client(unconf);
1670
1671         /* case 1 (normal case) */
1672 out_new:
1673         new = create_client(exid->clname, rqstp, &verf);
1674         if (new == NULL) {
1675                 status = nfserr_jukebox;
1676                 goto out;
1677         }
1678         new->cl_minorversion = 1;
1679
1680         gen_clid(new, nn);
1681         add_to_unconfirmed(new);
1682 out_copy:
1683         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1684         exid->clientid.cl_id = new->cl_clientid.cl_id;
1685
1686         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1687         nfsd4_set_ex_flags(new, exid);
1688
1689         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1690                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1691         status = nfs_ok;
1692
1693 out:
1694         nfs4_unlock_state();
1695         return status;
1696 }
1697
1698 static __be32
1699 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1700 {
1701         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1702                 slot_seqid);
1703
1704         /* The slot is in use, and no response has been sent. */
1705         if (slot_inuse) {
1706                 if (seqid == slot_seqid)
1707                         return nfserr_jukebox;
1708                 else
1709                         return nfserr_seq_misordered;
1710         }
1711         /* Note unsigned 32-bit arithmetic handles wraparound: */
1712         if (likely(seqid == slot_seqid + 1))
1713                 return nfs_ok;
1714         if (seqid == slot_seqid)
1715                 return nfserr_replay_cache;
1716         return nfserr_seq_misordered;
1717 }
1718
1719 /*
1720  * Cache the create session result into the create session single DRC
1721  * slot cache by saving the xdr structure. sl_seqid has been set.
1722  * Do this for solo or embedded create session operations.
1723  */
1724 static void
1725 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1726                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1727 {
1728         slot->sl_status = nfserr;
1729         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1730 }
1731
1732 static __be32
1733 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1734                             struct nfsd4_clid_slot *slot)
1735 {
1736         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1737         return slot->sl_status;
1738 }
1739
1740 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1741                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1742                         1 +     /* MIN tag is length with zero, only length */ \
1743                         3 +     /* version, opcount, opcode */ \
1744                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1745                                 /* seqid, slotID, slotID, cache */ \
1746                         4 ) * sizeof(__be32))
1747
1748 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1749                         2 +     /* verifier: AUTH_NULL, length 0 */\
1750                         1 +     /* status */ \
1751                         1 +     /* MIN tag is length with zero, only length */ \
1752                         3 +     /* opcount, opcode, opstatus*/ \
1753                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1754                                 /* seqid, slotID, slotID, slotID, status */ \
1755                         5 ) * sizeof(__be32))
1756
1757 static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1758 {
1759         return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1760                 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1761 }
1762
1763 __be32
1764 nfsd4_create_session(struct svc_rqst *rqstp,
1765                      struct nfsd4_compound_state *cstate,
1766                      struct nfsd4_create_session *cr_ses)
1767 {
1768         struct sockaddr *sa = svc_addr(rqstp);
1769         struct nfs4_client *conf, *unconf;
1770         struct nfsd4_session *new;
1771         struct nfsd4_conn *conn;
1772         struct nfsd4_clid_slot *cs_slot = NULL;
1773         __be32 status = 0;
1774         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1775
1776         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1777                 return nfserr_inval;
1778         if (check_forechannel_attrs(cr_ses->fore_channel))
1779                 return nfserr_toosmall;
1780         new = alloc_session(&cr_ses->fore_channel, nn);
1781         if (!new)
1782                 return nfserr_jukebox;
1783         status = nfserr_jukebox;
1784         conn = alloc_conn_from_crses(rqstp, cr_ses);
1785         if (!conn)
1786                 goto out_free_session;
1787
1788         nfs4_lock_state();
1789         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1790         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1791         WARN_ON_ONCE(conf && unconf);
1792
1793         if (conf) {
1794                 cs_slot = &conf->cl_cs_slot;
1795                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1796                 if (status == nfserr_replay_cache) {
1797                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1798                         goto out_free_conn;
1799                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1800                         status = nfserr_seq_misordered;
1801                         goto out_free_conn;
1802                 }
1803         } else if (unconf) {
1804                 struct nfs4_client *old;
1805                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1806                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1807                         status = nfserr_clid_inuse;
1808                         goto out_free_conn;
1809                 }
1810                 cs_slot = &unconf->cl_cs_slot;
1811                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1812                 if (status) {
1813                         /* an unconfirmed replay returns misordered */
1814                         status = nfserr_seq_misordered;
1815                         goto out_free_conn;
1816                 }
1817                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1818                 if (old)
1819                         expire_client(old);
1820                 move_to_confirmed(unconf);
1821                 conf = unconf;
1822         } else {
1823                 status = nfserr_stale_clientid;
1824                 goto out_free_conn;
1825         }
1826         status = nfs_ok;
1827         /*
1828          * We do not support RDMA or persistent sessions
1829          */
1830         cr_ses->flags &= ~SESSION4_PERSIST;
1831         cr_ses->flags &= ~SESSION4_RDMA;
1832
1833         init_session(rqstp, new, conf, cr_ses);
1834         nfsd4_init_conn(rqstp, conn, new);
1835
1836         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1837                NFS4_MAX_SESSIONID_LEN);
1838         memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1839                 sizeof(struct nfsd4_channel_attrs));
1840         cs_slot->sl_seqid++;
1841         cr_ses->seqid = cs_slot->sl_seqid;
1842
1843         /* cache solo and embedded create sessions under the state lock */
1844         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1845         nfs4_unlock_state();
1846         return status;
1847 out_free_conn:
1848         nfs4_unlock_state();
1849         free_conn(conn);
1850 out_free_session:
1851         __free_session(new);
1852         return status;
1853 }
1854
1855 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1856 {
1857         switch (*dir) {
1858         case NFS4_CDFC4_FORE:
1859         case NFS4_CDFC4_BACK:
1860                 return nfs_ok;
1861         case NFS4_CDFC4_FORE_OR_BOTH:
1862         case NFS4_CDFC4_BACK_OR_BOTH:
1863                 *dir = NFS4_CDFC4_BOTH;
1864                 return nfs_ok;
1865         };
1866         return nfserr_inval;
1867 }
1868
1869 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
1870 {
1871         struct nfsd4_session *session = cstate->session;
1872         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1873
1874         spin_lock(&nn->client_lock);
1875         session->se_cb_prog = bc->bc_cb_program;
1876         session->se_cb_sec = bc->bc_cb_sec;
1877         spin_unlock(&nn->client_lock);
1878
1879         nfsd4_probe_callback(session->se_client);
1880
1881         return nfs_ok;
1882 }
1883
1884 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1885                      struct nfsd4_compound_state *cstate,
1886                      struct nfsd4_bind_conn_to_session *bcts)
1887 {
1888         __be32 status;
1889         struct nfsd4_conn *conn;
1890         struct nfsd4_session *session;
1891         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1892
1893         if (!nfsd4_last_compound_op(rqstp))
1894                 return nfserr_not_only_op;
1895         nfs4_lock_state();
1896         spin_lock(&nn->client_lock);
1897         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
1898         spin_unlock(&nn->client_lock);
1899         status = nfserr_badsession;
1900         if (!session)
1901                 goto out;
1902         status = nfsd4_map_bcts_dir(&bcts->dir);
1903         if (status)
1904                 goto out;
1905         conn = alloc_conn(rqstp, bcts->dir);
1906         status = nfserr_jukebox;
1907         if (!conn)
1908                 goto out;
1909         nfsd4_init_conn(rqstp, conn, session);
1910         status = nfs_ok;
1911 out:
1912         nfs4_unlock_state();
1913         return status;
1914 }
1915
1916 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1917 {
1918         if (!session)
1919                 return 0;
1920         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1921 }
1922
1923 __be32
1924 nfsd4_destroy_session(struct svc_rqst *r,
1925                       struct nfsd4_compound_state *cstate,
1926                       struct nfsd4_destroy_session *sessionid)
1927 {
1928         struct nfsd4_session *ses;
1929         __be32 status;
1930         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
1931
1932         nfs4_lock_state();
1933         status = nfserr_not_only_op;
1934         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1935                 if (!nfsd4_last_compound_op(r))
1936                         goto out;
1937         }
1938         dump_sessionid(__func__, &sessionid->sessionid);
1939         spin_lock(&nn->client_lock);
1940         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
1941         status = nfserr_badsession;
1942         if (!ses)
1943                 goto out_client_lock;
1944
1945         unhash_session(ses);
1946         spin_unlock(&nn->client_lock);
1947
1948         nfsd4_probe_callback_sync(ses->se_client);
1949
1950         spin_lock(&nn->client_lock);
1951         nfsd4_del_conns(ses);
1952         nfsd4_put_session_locked(ses);
1953         status = nfs_ok;
1954 out_client_lock:
1955         spin_unlock(&nn->client_lock);
1956 out:
1957         nfs4_unlock_state();
1958         return status;
1959 }
1960
1961 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1962 {
1963         struct nfsd4_conn *c;
1964
1965         list_for_each_entry(c, &s->se_conns, cn_persession) {
1966                 if (c->cn_xprt == xpt) {
1967                         return c;
1968                 }
1969         }
1970         return NULL;
1971 }
1972
1973 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1974 {
1975         struct nfs4_client *clp = ses->se_client;
1976         struct nfsd4_conn *c;
1977         int ret;
1978
1979         spin_lock(&clp->cl_lock);
1980         c = __nfsd4_find_conn(new->cn_xprt, ses);
1981         if (c) {
1982                 spin_unlock(&clp->cl_lock);
1983                 free_conn(new);
1984                 return;
1985         }
1986         __nfsd4_hash_conn(new, ses);
1987         spin_unlock(&clp->cl_lock);
1988         ret = nfsd4_register_conn(new);
1989         if (ret)
1990                 /* oops; xprt is already down: */
1991                 nfsd4_conn_lost(&new->cn_xpt_user);
1992         return;
1993 }
1994
1995 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
1996 {
1997         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1998
1999         return args->opcnt > session->se_fchannel.maxops;
2000 }
2001
2002 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2003                                   struct nfsd4_session *session)
2004 {
2005         struct xdr_buf *xb = &rqstp->rq_arg;
2006
2007         return xb->len > session->se_fchannel.maxreq_sz;
2008 }
2009
2010 __be32
2011 nfsd4_sequence(struct svc_rqst *rqstp,
2012                struct nfsd4_compound_state *cstate,
2013                struct nfsd4_sequence *seq)
2014 {
2015         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2016         struct nfsd4_session *session;
2017         struct nfsd4_slot *slot;
2018         struct nfsd4_conn *conn;
2019         __be32 status;
2020         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2021
2022         if (resp->opcnt != 1)
2023                 return nfserr_sequence_pos;
2024
2025         /*
2026          * Will be either used or freed by nfsd4_sequence_check_conn
2027          * below.
2028          */
2029         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2030         if (!conn)
2031                 return nfserr_jukebox;
2032
2033         spin_lock(&nn->client_lock);
2034         status = nfserr_badsession;
2035         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2036         if (!session)
2037                 goto out;
2038
2039         status = nfserr_too_many_ops;
2040         if (nfsd4_session_too_many_ops(rqstp, session))
2041                 goto out;
2042
2043         status = nfserr_req_too_big;
2044         if (nfsd4_request_too_big(rqstp, session))
2045                 goto out;
2046
2047         status = nfserr_badslot;
2048         if (seq->slotid >= session->se_fchannel.maxreqs)
2049                 goto out;
2050
2051         slot = session->se_slots[seq->slotid];
2052         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2053
2054         /* We do not negotiate the number of slots yet, so set the
2055          * maxslots to the session maxreqs which is used to encode
2056          * sr_highest_slotid and the sr_target_slot id to maxslots */
2057         seq->maxslots = session->se_fchannel.maxreqs;
2058
2059         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2060                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2061         if (status == nfserr_replay_cache) {
2062                 status = nfserr_seq_misordered;
2063                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2064                         goto out;
2065                 cstate->slot = slot;
2066                 cstate->session = session;
2067                 /* Return the cached reply status and set cstate->status
2068                  * for nfsd4_proc_compound processing */
2069                 status = nfsd4_replay_cache_entry(resp, seq);
2070                 cstate->status = nfserr_replay_cache;
2071                 goto out;
2072         }
2073         if (status)
2074                 goto out;
2075
2076         nfsd4_sequence_check_conn(conn, session);
2077         conn = NULL;
2078
2079         /* Success! bump slot seqid */
2080         slot->sl_seqid = seq->seqid;
2081         slot->sl_flags |= NFSD4_SLOT_INUSE;
2082         if (seq->cachethis)
2083                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2084         else
2085                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2086
2087         cstate->slot = slot;
2088         cstate->session = session;
2089
2090 out:
2091         /* Hold a session reference until done processing the compound. */
2092         if (cstate->session) {
2093                 struct nfs4_client *clp = session->se_client;
2094
2095                 nfsd4_get_session(cstate->session);
2096                 atomic_inc(&clp->cl_refcount);
2097                 switch (clp->cl_cb_state) {
2098                 case NFSD4_CB_DOWN:
2099                         seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2100                         break;
2101                 case NFSD4_CB_FAULT:
2102                         seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2103                         break;
2104                 default:
2105                         seq->status_flags = 0;
2106                 }
2107         }
2108         kfree(conn);
2109         spin_unlock(&nn->client_lock);
2110         return status;
2111 }
2112
2113 __be32
2114 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2115 {
2116         struct nfs4_client *conf, *unconf, *clp;
2117         __be32 status = 0;
2118         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2119
2120         nfs4_lock_state();
2121         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2122         conf = find_confirmed_client(&dc->clientid, true, nn);
2123         WARN_ON_ONCE(conf && unconf);
2124
2125         if (conf) {
2126                 clp = conf;
2127
2128                 if (client_has_state(conf)) {
2129                         status = nfserr_clientid_busy;
2130                         goto out;
2131                 }
2132         } else if (unconf)
2133                 clp = unconf;
2134         else {
2135                 status = nfserr_stale_clientid;
2136                 goto out;
2137         }
2138
2139         expire_client(clp);
2140 out:
2141         nfs4_unlock_state();
2142         return status;
2143 }
2144
2145 __be32
2146 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2147 {
2148         __be32 status = 0;
2149
2150         if (rc->rca_one_fs) {
2151                 if (!cstate->current_fh.fh_dentry)
2152                         return nfserr_nofilehandle;
2153                 /*
2154                  * We don't take advantage of the rca_one_fs case.
2155                  * That's OK, it's optional, we can safely ignore it.
2156                  */
2157                  return nfs_ok;
2158         }
2159
2160         nfs4_lock_state();
2161         status = nfserr_complete_already;
2162         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2163                              &cstate->session->se_client->cl_flags))
2164                 goto out;
2165
2166         status = nfserr_stale_clientid;
2167         if (is_client_expired(cstate->session->se_client))
2168                 /*
2169                  * The following error isn't really legal.
2170                  * But we only get here if the client just explicitly
2171                  * destroyed the client.  Surely it no longer cares what
2172                  * error it gets back on an operation for the dead
2173                  * client.
2174                  */
2175                 goto out;
2176
2177         status = nfs_ok;
2178         nfsd4_client_record_create(cstate->session->se_client);
2179 out:
2180         nfs4_unlock_state();
2181         return status;
2182 }
2183
2184 __be32
2185 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2186                   struct nfsd4_setclientid *setclid)
2187 {
2188         struct xdr_netobj       clname = setclid->se_name;
2189         nfs4_verifier           clverifier = setclid->se_verf;
2190         struct nfs4_client      *conf, *unconf, *new;
2191         __be32                  status;
2192         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2193
2194         /* Cases below refer to rfc 3530 section 14.2.33: */
2195         nfs4_lock_state();
2196         conf = find_confirmed_client_by_name(&clname, nn);
2197         if (conf) {
2198                 /* case 0: */
2199                 status = nfserr_clid_inuse;
2200                 if (clp_used_exchangeid(conf))
2201                         goto out;
2202                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2203                         char addr_str[INET6_ADDRSTRLEN];
2204                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2205                                  sizeof(addr_str));
2206                         dprintk("NFSD: setclientid: string in use by client "
2207                                 "at %s\n", addr_str);
2208                         goto out;
2209                 }
2210         }
2211         unconf = find_unconfirmed_client_by_name(&clname, nn);
2212         if (unconf)
2213                 expire_client(unconf);
2214         status = nfserr_jukebox;
2215         new = create_client(clname, rqstp, &clverifier);
2216         if (new == NULL)
2217                 goto out;
2218         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2219                 /* case 1: probable callback update */
2220                 copy_clid(new, conf);
2221         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2222                 gen_clid(new, nn);
2223         new->cl_minorversion = 0;
2224         gen_callback(new, setclid, rqstp);
2225         add_to_unconfirmed(new);
2226         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2227         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2228         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2229         status = nfs_ok;
2230 out:
2231         nfs4_unlock_state();
2232         return status;
2233 }
2234
2235
2236 __be32
2237 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2238                          struct nfsd4_compound_state *cstate,
2239                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2240 {
2241         struct nfs4_client *conf, *unconf;
2242         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2243         clientid_t * clid = &setclientid_confirm->sc_clientid;
2244         __be32 status;
2245         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2246
2247         if (STALE_CLIENTID(clid, nn))
2248                 return nfserr_stale_clientid;
2249         nfs4_lock_state();
2250
2251         conf = find_confirmed_client(clid, false, nn);
2252         unconf = find_unconfirmed_client(clid, false, nn);
2253         /*
2254          * We try hard to give out unique clientid's, so if we get an
2255          * attempt to confirm the same clientid with a different cred,
2256          * there's a bug somewhere.  Let's charitably assume it's our
2257          * bug.
2258          */
2259         status = nfserr_serverfault;
2260         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2261                 goto out;
2262         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2263                 goto out;
2264         /* cases below refer to rfc 3530 section 14.2.34: */
2265         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2266                 if (conf && !unconf) /* case 2: probable retransmit */
2267                         status = nfs_ok;
2268                 else /* case 4: client hasn't noticed we rebooted yet? */
2269                         status = nfserr_stale_clientid;
2270                 goto out;
2271         }
2272         status = nfs_ok;
2273         if (conf) { /* case 1: callback update */
2274                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2275                 nfsd4_probe_callback(conf);
2276                 expire_client(unconf);
2277         } else { /* case 3: normal case; new or rebooted client */
2278                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2279                 if (conf)
2280                         expire_client(conf);
2281                 move_to_confirmed(unconf);
2282                 nfsd4_probe_callback(unconf);
2283         }
2284 out:
2285         nfs4_unlock_state();
2286         return status;
2287 }
2288
2289 static struct nfs4_file *nfsd4_alloc_file(void)
2290 {
2291         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2292 }
2293
2294 /* OPEN Share state helper functions */
2295 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2296 {
2297         unsigned int hashval = file_hashval(ino);
2298
2299         atomic_set(&fp->fi_ref, 1);
2300         INIT_LIST_HEAD(&fp->fi_hash);
2301         INIT_LIST_HEAD(&fp->fi_stateids);
2302         INIT_LIST_HEAD(&fp->fi_delegations);
2303         fp->fi_inode = igrab(ino);
2304         fp->fi_had_conflict = false;
2305         fp->fi_lease = NULL;
2306         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2307         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2308         spin_lock(&recall_lock);
2309         list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2310         spin_unlock(&recall_lock);
2311 }
2312
2313 static void
2314 nfsd4_free_slab(struct kmem_cache **slab)
2315 {
2316         if (*slab == NULL)
2317                 return;
2318         kmem_cache_destroy(*slab);
2319         *slab = NULL;
2320 }
2321
2322 void
2323 nfsd4_free_slabs(void)
2324 {
2325         nfsd4_free_slab(&openowner_slab);
2326         nfsd4_free_slab(&lockowner_slab);
2327         nfsd4_free_slab(&file_slab);
2328         nfsd4_free_slab(&stateid_slab);
2329         nfsd4_free_slab(&deleg_slab);
2330 }
2331
2332 int
2333 nfsd4_init_slabs(void)
2334 {
2335         openowner_slab = kmem_cache_create("nfsd4_openowners",
2336                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2337         if (openowner_slab == NULL)
2338                 goto out_nomem;
2339         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2340                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2341         if (lockowner_slab == NULL)
2342                 goto out_nomem;
2343         file_slab = kmem_cache_create("nfsd4_files",
2344                         sizeof(struct nfs4_file), 0, 0, NULL);
2345         if (file_slab == NULL)
2346                 goto out_nomem;
2347         stateid_slab = kmem_cache_create("nfsd4_stateids",
2348                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2349         if (stateid_slab == NULL)
2350                 goto out_nomem;
2351         deleg_slab = kmem_cache_create("nfsd4_delegations",
2352                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2353         if (deleg_slab == NULL)
2354                 goto out_nomem;
2355         return 0;
2356 out_nomem:
2357         nfsd4_free_slabs();
2358         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2359         return -ENOMEM;
2360 }
2361
2362 void nfs4_free_openowner(struct nfs4_openowner *oo)
2363 {
2364         kfree(oo->oo_owner.so_owner.data);
2365         kmem_cache_free(openowner_slab, oo);
2366 }
2367
2368 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2369 {
2370         kfree(lo->lo_owner.so_owner.data);
2371         kmem_cache_free(lockowner_slab, lo);
2372 }
2373
2374 static void init_nfs4_replay(struct nfs4_replay *rp)
2375 {
2376         rp->rp_status = nfserr_serverfault;
2377         rp->rp_buflen = 0;
2378         rp->rp_buf = rp->rp_ibuf;
2379 }
2380
2381 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2382 {
2383         struct nfs4_stateowner *sop;
2384
2385         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2386         if (!sop)
2387                 return NULL;
2388
2389         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2390         if (!sop->so_owner.data) {
2391                 kmem_cache_free(slab, sop);
2392                 return NULL;
2393         }
2394         sop->so_owner.len = owner->len;
2395
2396         INIT_LIST_HEAD(&sop->so_stateids);
2397         sop->so_client = clp;
2398         init_nfs4_replay(&sop->so_replay);
2399         return sop;
2400 }
2401
2402 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2403 {
2404         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2405
2406         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2407         list_add(&oo->oo_perclient, &clp->cl_openowners);
2408 }
2409
2410 static struct nfs4_openowner *
2411 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2412         struct nfs4_openowner *oo;
2413
2414         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2415         if (!oo)
2416                 return NULL;
2417         oo->oo_owner.so_is_open_owner = 1;
2418         oo->oo_owner.so_seqid = open->op_seqid;
2419         oo->oo_flags = NFS4_OO_NEW;
2420         oo->oo_time = 0;
2421         oo->oo_last_closed_stid = NULL;
2422         INIT_LIST_HEAD(&oo->oo_close_lru);
2423         hash_openowner(oo, clp, strhashval);
2424         return oo;
2425 }
2426
2427 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2428         struct nfs4_openowner *oo = open->op_openowner;
2429
2430         stp->st_stid.sc_type = NFS4_OPEN_STID;
2431         INIT_LIST_HEAD(&stp->st_lockowners);
2432         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2433         list_add(&stp->st_perfile, &fp->fi_stateids);
2434         stp->st_stateowner = &oo->oo_owner;
2435         get_nfs4_file(fp);
2436         stp->st_file = fp;
2437         stp->st_access_bmap = 0;
2438         stp->st_deny_bmap = 0;
2439         set_access(open->op_share_access, stp);
2440         set_deny(open->op_share_deny, stp);
2441         stp->st_openstp = NULL;
2442 }
2443
2444 static void
2445 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2446 {
2447         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2448
2449         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2450
2451         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2452         oo->oo_time = get_seconds();
2453 }
2454
2455 static int
2456 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2457                                                         clientid_t *clid)
2458 {
2459         return (sop->so_owner.len == owner->len) &&
2460                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2461                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2462 }
2463
2464 static struct nfs4_openowner *
2465 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2466                         bool sessions, struct nfsd_net *nn)
2467 {
2468         struct nfs4_stateowner *so;
2469         struct nfs4_openowner *oo;
2470         struct nfs4_client *clp;
2471
2472         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2473                 if (!so->so_is_open_owner)
2474                         continue;
2475                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2476                         oo = openowner(so);
2477                         clp = oo->oo_owner.so_client;
2478                         if ((bool)clp->cl_minorversion != sessions)
2479                                 return NULL;
2480                         renew_client(oo->oo_owner.so_client);
2481                         return oo;
2482                 }
2483         }
2484         return NULL;
2485 }
2486
2487 /* search file_hashtbl[] for file */
2488 static struct nfs4_file *
2489 find_file(struct inode *ino)
2490 {
2491         unsigned int hashval = file_hashval(ino);
2492         struct nfs4_file *fp;
2493
2494         spin_lock(&recall_lock);
2495         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2496                 if (fp->fi_inode == ino) {
2497                         get_nfs4_file(fp);
2498                         spin_unlock(&recall_lock);
2499                         return fp;
2500                 }
2501         }
2502         spin_unlock(&recall_lock);
2503         return NULL;
2504 }
2505
2506 /*
2507  * Called to check deny when READ with all zero stateid or
2508  * WRITE with all zero or all one stateid
2509  */
2510 static __be32
2511 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2512 {
2513         struct inode *ino = current_fh->fh_dentry->d_inode;
2514         struct nfs4_file *fp;
2515         struct nfs4_ol_stateid *stp;
2516         __be32 ret;
2517
2518         fp = find_file(ino);
2519         if (!fp)
2520                 return nfs_ok;
2521         ret = nfserr_locked;
2522         /* Search for conflicting share reservations */
2523         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2524                 if (test_deny(deny_type, stp) ||
2525                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2526                         goto out;
2527         }
2528         ret = nfs_ok;
2529 out:
2530         put_nfs4_file(fp);
2531         return ret;
2532 }
2533
2534 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2535 {
2536         /* We're assuming the state code never drops its reference
2537          * without first removing the lease.  Since we're in this lease
2538          * callback (and since the lease code is serialized by the kernel
2539          * lock) we know the server hasn't removed the lease yet, we know
2540          * it's safe to take a reference: */
2541         atomic_inc(&dp->dl_count);
2542
2543         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2544
2545         /* only place dl_time is set. protected by lock_flocks*/
2546         dp->dl_time = get_seconds();
2547
2548         nfsd4_cb_recall(dp);
2549 }
2550
2551 /* Called from break_lease() with lock_flocks() held. */
2552 static void nfsd_break_deleg_cb(struct file_lock *fl)
2553 {
2554         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2555         struct nfs4_delegation *dp;
2556
2557         if (!fp) {
2558                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2559                 return;
2560         }
2561         if (fp->fi_had_conflict) {
2562                 WARN(1, "duplicate break on %p\n", fp);
2563                 return;
2564         }
2565         /*
2566          * We don't want the locks code to timeout the lease for us;
2567          * we'll remove it ourself if a delegation isn't returned
2568          * in time:
2569          */
2570         fl->fl_break_time = 0;
2571
2572         spin_lock(&recall_lock);
2573         fp->fi_had_conflict = true;
2574         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2575                 nfsd_break_one_deleg(dp);
2576         spin_unlock(&recall_lock);
2577 }
2578
2579 static
2580 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2581 {
2582         if (arg & F_UNLCK)
2583                 return lease_modify(onlist, arg);
2584         else
2585                 return -EAGAIN;
2586 }
2587
2588 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2589         .lm_break = nfsd_break_deleg_cb,
2590         .lm_change = nfsd_change_deleg_cb,
2591 };
2592
2593 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2594 {
2595         if (nfsd4_has_session(cstate))
2596                 return nfs_ok;
2597         if (seqid == so->so_seqid - 1)
2598                 return nfserr_replay_me;
2599         if (seqid == so->so_seqid)
2600                 return nfs_ok;
2601         return nfserr_bad_seqid;
2602 }
2603
2604 __be32
2605 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2606                     struct nfsd4_open *open, struct nfsd_net *nn)
2607 {
2608         clientid_t *clientid = &open->op_clientid;
2609         struct nfs4_client *clp = NULL;
2610         unsigned int strhashval;
2611         struct nfs4_openowner *oo = NULL;
2612         __be32 status;
2613
2614         if (STALE_CLIENTID(&open->op_clientid, nn))
2615                 return nfserr_stale_clientid;
2616         /*
2617          * In case we need it later, after we've already created the
2618          * file and don't want to risk a further failure:
2619          */
2620         open->op_file = nfsd4_alloc_file();
2621         if (open->op_file == NULL)
2622                 return nfserr_jukebox;
2623
2624         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2625         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2626         open->op_openowner = oo;
2627         if (!oo) {
2628                 clp = find_confirmed_client(clientid, cstate->minorversion,
2629                                             nn);
2630                 if (clp == NULL)
2631                         return nfserr_expired;
2632                 goto new_owner;
2633         }
2634         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2635                 /* Replace unconfirmed owners without checking for replay. */
2636                 clp = oo->oo_owner.so_client;
2637                 release_openowner(oo);
2638                 open->op_openowner = NULL;
2639                 goto new_owner;
2640         }
2641         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2642         if (status)
2643                 return status;
2644         clp = oo->oo_owner.so_client;
2645         goto alloc_stateid;
2646 new_owner:
2647         oo = alloc_init_open_stateowner(strhashval, clp, open);
2648         if (oo == NULL)
2649                 return nfserr_jukebox;
2650         open->op_openowner = oo;
2651 alloc_stateid:
2652         open->op_stp = nfs4_alloc_stateid(clp);
2653         if (!open->op_stp)
2654                 return nfserr_jukebox;
2655         return nfs_ok;
2656 }
2657
2658 static inline __be32
2659 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2660 {
2661         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2662                 return nfserr_openmode;
2663         else
2664                 return nfs_ok;
2665 }
2666
2667 static int share_access_to_flags(u32 share_access)
2668 {
2669         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2670 }
2671
2672 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2673 {
2674         struct nfs4_stid *ret;
2675
2676         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2677         if (!ret)
2678                 return NULL;
2679         return delegstateid(ret);
2680 }
2681
2682 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2683 {
2684         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2685                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2686 }
2687
2688 static __be32
2689 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2690                 struct nfs4_delegation **dp)
2691 {
2692         int flags;
2693         __be32 status = nfserr_bad_stateid;
2694
2695         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2696         if (*dp == NULL)
2697                 goto out;
2698         flags = share_access_to_flags(open->op_share_access);
2699         status = nfs4_check_delegmode(*dp, flags);
2700         if (status)
2701                 *dp = NULL;
2702 out:
2703         if (!nfsd4_is_deleg_cur(open))
2704                 return nfs_ok;
2705         if (status)
2706                 return status;
2707         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2708         return nfs_ok;
2709 }
2710
2711 static __be32
2712 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2713 {
2714         struct nfs4_ol_stateid *local;
2715         struct nfs4_openowner *oo = open->op_openowner;
2716
2717         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2718                 /* ignore lock owners */
2719                 if (local->st_stateowner->so_is_open_owner == 0)
2720                         continue;
2721                 /* remember if we have seen this open owner */
2722                 if (local->st_stateowner == &oo->oo_owner)
2723                         *stpp = local;
2724                 /* check for conflicting share reservations */
2725                 if (!test_share(local, open))
2726                         return nfserr_share_denied;
2727         }
2728         return nfs_ok;
2729 }
2730
2731 static inline int nfs4_access_to_access(u32 nfs4_access)
2732 {
2733         int flags = 0;
2734
2735         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2736                 flags |= NFSD_MAY_READ;
2737         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2738                 flags |= NFSD_MAY_WRITE;
2739         return flags;
2740 }
2741
2742 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2743                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2744 {
2745         __be32 status;
2746         int oflag = nfs4_access_to_omode(open->op_share_access);
2747         int access = nfs4_access_to_access(open->op_share_access);
2748
2749         if (!fp->fi_fds[oflag]) {
2750                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2751                         &fp->fi_fds[oflag]);
2752                 if (status)
2753                         return status;
2754         }
2755         nfs4_file_get_access(fp, oflag);
2756
2757         return nfs_ok;
2758 }
2759
2760 static inline __be32
2761 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2762                 struct nfsd4_open *open)
2763 {
2764         struct iattr iattr = {
2765                 .ia_valid = ATTR_SIZE,
2766                 .ia_size = 0,
2767         };
2768         if (!open->op_truncate)
2769                 return 0;
2770         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2771                 return nfserr_inval;
2772         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2773 }
2774
2775 static __be32
2776 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)
2777 {
2778         u32 op_share_access = open->op_share_access;
2779         bool new_access;
2780         __be32 status;
2781
2782         new_access = !test_access(op_share_access, stp);
2783         if (new_access) {
2784                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2785                 if (status)
2786                         return status;
2787         }
2788         status = nfsd4_truncate(rqstp, cur_fh, open);
2789         if (status) {
2790                 if (new_access) {
2791                         int oflag = nfs4_access_to_omode(op_share_access);
2792                         nfs4_file_put_access(fp, oflag);
2793                 }
2794                 return status;
2795         }
2796         /* remember the open */
2797         set_access(op_share_access, stp);
2798         set_deny(open->op_share_deny, stp);
2799
2800         return nfs_ok;
2801 }
2802
2803
2804 static void
2805 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2806 {
2807         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2808 }
2809
2810 /* Should we give out recallable state?: */
2811 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2812 {
2813         if (clp->cl_cb_state == NFSD4_CB_UP)
2814                 return true;
2815         /*
2816          * In the sessions case, since we don't have to establish a
2817          * separate connection for callbacks, we assume it's OK
2818          * until we hear otherwise:
2819          */
2820         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2821 }
2822
2823 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2824 {
2825         struct file_lock *fl;
2826
2827         fl = locks_alloc_lock();
2828         if (!fl)
2829                 return NULL;
2830         locks_init_lock(fl);
2831         fl->fl_lmops = &nfsd_lease_mng_ops;
2832         fl->fl_flags = FL_LEASE;
2833         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2834         fl->fl_end = OFFSET_MAX;
2835         fl->fl_owner = (fl_owner_t)(dp->dl_file);
2836         fl->fl_pid = current->tgid;
2837         return fl;
2838 }
2839
2840 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2841 {
2842         struct nfs4_file *fp = dp->dl_file;
2843         struct file_lock *fl;
2844         int status;
2845
2846         fl = nfs4_alloc_init_lease(dp, flag);
2847         if (!fl)
2848                 return -ENOMEM;
2849         fl->fl_file = find_readable_file(fp);
2850         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2851         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2852         if (status) {
2853                 list_del_init(&dp->dl_perclnt);
2854                 locks_free_lock(fl);
2855                 return -ENOMEM;
2856         }
2857         fp->fi_lease = fl;
2858         fp->fi_deleg_file = get_file(fl->fl_file);
2859         atomic_set(&fp->fi_delegees, 1);
2860         list_add(&dp->dl_perfile, &fp->fi_delegations);
2861         return 0;
2862 }
2863
2864 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2865 {
2866         struct nfs4_file *fp = dp->dl_file;
2867
2868         if (!fp->fi_lease)
2869                 return nfs4_setlease(dp, flag);
2870         spin_lock(&recall_lock);
2871         if (fp->fi_had_conflict) {
2872                 spin_unlock(&recall_lock);
2873                 return -EAGAIN;
2874         }
2875         atomic_inc(&fp->fi_delegees);
2876         list_add(&dp->dl_perfile, &fp->fi_delegations);
2877         spin_unlock(&recall_lock);
2878         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2879         return 0;
2880 }
2881
2882 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2883 {
2884         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2885         if (status == -EAGAIN)
2886                 open->op_why_no_deleg = WND4_CONTENTION;
2887         else {
2888                 open->op_why_no_deleg = WND4_RESOURCE;
2889                 switch (open->op_deleg_want) {
2890                 case NFS4_SHARE_WANT_READ_DELEG:
2891                 case NFS4_SHARE_WANT_WRITE_DELEG:
2892                 case NFS4_SHARE_WANT_ANY_DELEG:
2893                         break;
2894                 case NFS4_SHARE_WANT_CANCEL:
2895                         open->op_why_no_deleg = WND4_CANCELLED;
2896                         break;
2897                 case NFS4_SHARE_WANT_NO_DELEG:
2898                         WARN_ON_ONCE(1);
2899                 }
2900         }
2901 }
2902
2903 /*
2904  * Attempt to hand out a delegation.
2905  */
2906 static void
2907 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
2908                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2909 {
2910         struct nfs4_delegation *dp;
2911         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2912         int cb_up;
2913         int status = 0, flag = 0;
2914
2915         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2916         flag = NFS4_OPEN_DELEGATE_NONE;
2917         open->op_recall = 0;
2918         switch (open->op_claim_type) {
2919                 case NFS4_OPEN_CLAIM_PREVIOUS:
2920                         if (!cb_up)
2921                                 open->op_recall = 1;
2922                         flag = open->op_delegate_type;
2923                         if (flag == NFS4_OPEN_DELEGATE_NONE)
2924                                 goto out;
2925                         break;
2926                 case NFS4_OPEN_CLAIM_NULL:
2927                         /* Let's not give out any delegations till everyone's
2928                          * had the chance to reclaim theirs.... */
2929                         if (locks_in_grace(net))
2930                                 goto out;
2931                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2932                                 goto out;
2933                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2934                                 flag = NFS4_OPEN_DELEGATE_WRITE;
2935                         else
2936                                 flag = NFS4_OPEN_DELEGATE_READ;
2937                         break;
2938                 default:
2939                         goto out;
2940         }
2941
2942         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2943         if (dp == NULL)
2944                 goto out_no_deleg;
2945         status = nfs4_set_delegation(dp, flag);
2946         if (status)
2947                 goto out_free;
2948
2949         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2950
2951         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2952                 STATEID_VAL(&dp->dl_stid.sc_stateid));
2953 out:
2954         open->op_delegate_type = flag;
2955         if (flag == NFS4_OPEN_DELEGATE_NONE) {
2956                 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2957                     open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2958                         dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2959
2960                 /* 4.1 client asking for a delegation? */
2961                 if (open->op_deleg_want)
2962                         nfsd4_open_deleg_none_ext(open, status);
2963         }
2964         return;
2965 out_free:
2966         unhash_stid(&dp->dl_stid);
2967         nfs4_put_delegation(dp);
2968 out_no_deleg:
2969         flag = NFS4_OPEN_DELEGATE_NONE;
2970         goto out;
2971 }
2972
2973 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
2974                                         struct nfs4_delegation *dp)
2975 {
2976         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
2977             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2978                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2979                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
2980         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
2981                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
2982                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2983                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
2984         }
2985         /* Otherwise the client must be confused wanting a delegation
2986          * it already has, therefore we don't return
2987          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
2988          */
2989 }
2990
2991 /*
2992  * called with nfs4_lock_state() held.
2993  */
2994 __be32
2995 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2996 {
2997         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2998         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
2999         struct nfs4_file *fp = NULL;
3000         struct inode *ino = current_fh->fh_dentry->d_inode;
3001         struct nfs4_ol_stateid *stp = NULL;
3002         struct nfs4_delegation *dp = NULL;
3003         __be32 status;
3004
3005         /*
3006          * Lookup file; if found, lookup stateid and check open request,
3007          * and check for delegations in the process of being recalled.
3008          * If not found, create the nfs4_file struct
3009          */
3010         fp = find_file(ino);
3011         if (fp) {
3012                 if ((status = nfs4_check_open(fp, open, &stp)))
3013                         goto out;
3014                 status = nfs4_check_deleg(cl, fp, open, &dp);
3015                 if (status)
3016                         goto out;
3017         } else {
3018                 status = nfserr_bad_stateid;
3019                 if (nfsd4_is_deleg_cur(open))
3020                         goto out;
3021                 status = nfserr_jukebox;
3022                 fp = open->op_file;
3023                 open->op_file = NULL;
3024                 nfsd4_init_file(fp, ino);
3025         }
3026
3027         /*
3028          * OPEN the file, or upgrade an existing OPEN.
3029          * If truncate fails, the OPEN fails.
3030          */
3031         if (stp) {
3032                 /* Stateid was found, this is an OPEN upgrade */
3033                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3034                 if (status)
3035                         goto out;
3036         } else {
3037                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3038                 if (status)
3039                         goto out;
3040                 status = nfsd4_truncate(rqstp, current_fh, open);
3041                 if (status)
3042                         goto out;
3043                 stp = open->op_stp;
3044                 open->op_stp = NULL;
3045                 init_open_stateid(stp, fp, open);
3046         }
3047         update_stateid(&stp->st_stid.sc_stateid);
3048         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3049
3050         if (nfsd4_has_session(&resp->cstate)) {
3051                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3052
3053                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3054                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3055                         open->op_why_no_deleg = WND4_NOT_WANTED;
3056                         goto nodeleg;
3057                 }
3058         }
3059
3060         /*
3061         * Attempt to hand out a delegation. No error return, because the
3062         * OPEN succeeds even if we fail.
3063         */
3064         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3065 nodeleg:
3066         status = nfs_ok;
3067
3068         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3069                 STATEID_VAL(&stp->st_stid.sc_stateid));
3070 out:
3071         /* 4.1 client trying to upgrade/downgrade delegation? */
3072         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3073             open->op_deleg_want)
3074                 nfsd4_deleg_xgrade_none_ext(open, dp);
3075
3076         if (fp)
3077                 put_nfs4_file(fp);
3078         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3079                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3080         /*
3081         * To finish the open response, we just need to set the rflags.
3082         */
3083         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3084         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3085             !nfsd4_has_session(&resp->cstate))
3086                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3087
3088         return status;
3089 }
3090
3091 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3092 {
3093         if (open->op_openowner) {
3094                 struct nfs4_openowner *oo = open->op_openowner;
3095
3096                 if (!list_empty(&oo->oo_owner.so_stateids))
3097                         list_del_init(&oo->oo_close_lru);
3098                 if (oo->oo_flags & NFS4_OO_NEW) {
3099                         if (status) {
3100                                 release_openowner(oo);
3101                                 open->op_openowner = NULL;
3102                         } else
3103                                 oo->oo_flags &= ~NFS4_OO_NEW;
3104                 }
3105         }
3106         if (open->op_file)
3107                 nfsd4_free_file(open->op_file);
3108         if (open->op_stp)
3109                 free_generic_stateid(open->op_stp);
3110 }
3111
3112 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3113 {
3114         struct nfs4_client *found;
3115
3116         if (STALE_CLIENTID(clid, nn))
3117                 return nfserr_stale_clientid;
3118         found = find_confirmed_client(clid, session, nn);
3119         if (clp)
3120                 *clp = found;
3121         return found ? nfs_ok : nfserr_expired;
3122 }
3123
3124 __be32
3125 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3126             clientid_t *clid)
3127 {
3128         struct nfs4_client *clp;
3129         __be32 status;
3130         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3131
3132         nfs4_lock_state();
3133         dprintk("process_renew(%08x/%08x): starting\n",
3134                         clid->cl_boot, clid->cl_id);
3135         status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3136         if (status)
3137                 goto out;
3138         status = nfserr_cb_path_down;
3139         if (!list_empty(&clp->cl_delegations)
3140                         && clp->cl_cb_state != NFSD4_CB_UP)
3141                 goto out;
3142         status = nfs_ok;
3143 out:
3144         nfs4_unlock_state();
3145         return status;
3146 }
3147
3148 static void
3149 nfsd4_end_grace(struct nfsd_net *nn)
3150 {
3151         /* do nothing if grace period already ended */
3152         if (nn->grace_ended)
3153                 return;
3154
3155         dprintk("NFSD: end of grace period\n");
3156         nn->grace_ended = true;
3157         nfsd4_record_grace_done(nn, nn->boot_time);
3158         locks_end_grace(&nn->nfsd4_manager);
3159         /*
3160          * Now that every NFSv4 client has had the chance to recover and
3161          * to see the (possibly new, possibly shorter) lease time, we
3162          * can safely set the next grace time to the current lease time:
3163          */
3164         nn->nfsd4_grace = nn->nfsd4_lease;
3165 }
3166
3167 static time_t
3168 nfs4_laundromat(struct nfsd_net *nn)
3169 {
3170         struct nfs4_client *clp;
3171         struct nfs4_openowner *oo;
3172         struct nfs4_delegation *dp;
3173         struct list_head *pos, *next, reaplist;
3174         time_t cutoff = get_seconds() - nn->nfsd4_lease;
3175         time_t t, clientid_val = nn->nfsd4_lease;
3176         time_t u, test_val = nn->nfsd4_lease;
3177
3178         nfs4_lock_state();
3179
3180         dprintk("NFSD: laundromat service - starting\n");
3181         nfsd4_end_grace(nn);
3182         INIT_LIST_HEAD(&reaplist);
3183         spin_lock(&nn->client_lock);
3184         list_for_each_safe(pos, next, &nn->client_lru) {
3185                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3186                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3187                         t = clp->cl_time - cutoff;
3188                         if (clientid_val > t)
3189                                 clientid_val = t;
3190                         break;
3191                 }
3192                 if (atomic_read(&clp->cl_refcount)) {
3193                         dprintk("NFSD: client in use (clientid %08x)\n",
3194                                 clp->cl_clientid.cl_id);
3195                         continue;
3196                 }
3197                 unhash_client_locked(clp);
3198                 list_add(&clp->cl_lru, &reaplist);
3199         }
3200         spin_unlock(&nn->client_lock);
3201         list_for_each_safe(pos, next, &reaplist) {
3202                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3203                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3204                         clp->cl_clientid.cl_id);
3205                 expire_client(clp);
3206         }
3207         spin_lock(&recall_lock);
3208         list_for_each_safe(pos, next, &del_recall_lru) {
3209                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3210                 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3211                         continue;
3212                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3213                         u = dp->dl_time - cutoff;
3214                         if (test_val > u)
3215                                 test_val = u;
3216                         break;
3217                 }
3218                 list_move(&dp->dl_recall_lru, &reaplist);
3219         }
3220         spin_unlock(&recall_lock);
3221         list_for_each_safe(pos, next, &reaplist) {
3222                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3223                 unhash_delegation(dp);
3224         }
3225         test_val = nn->nfsd4_lease;
3226         list_for_each_safe(pos, next, &nn->close_lru) {
3227                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3228                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3229                         u = oo->oo_time - cutoff;
3230                         if (test_val > u)
3231                                 test_val = u;
3232                         break;
3233                 }
3234                 release_openowner(oo);
3235         }
3236         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3237                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3238         nfs4_unlock_state();
3239         return clientid_val;
3240 }
3241
3242 static struct workqueue_struct *laundry_wq;
3243 static void laundromat_main(struct work_struct *);
3244
3245 static void
3246 laundromat_main(struct work_struct *laundry)
3247 {
3248         time_t t;
3249         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3250                                                   work);
3251         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3252                                            laundromat_work);
3253
3254         t = nfs4_laundromat(nn);
3255         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3256         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3257 }
3258
3259 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3260 {
3261         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3262                 return nfserr_bad_stateid;
3263         return nfs_ok;
3264 }
3265
3266 static inline int
3267 access_permit_read(struct nfs4_ol_stateid *stp)
3268 {
3269         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3270                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3271                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3272 }
3273
3274 static inline int
3275 access_permit_write(struct nfs4_ol_stateid *stp)
3276 {
3277         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3278                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3279 }
3280
3281 static
3282 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3283 {
3284         __be32 status = nfserr_openmode;
3285
3286         /* For lock stateid's, we test the parent open, not the lock: */
3287         if (stp->st_openstp)
3288                 stp = stp->st_openstp;
3289         if ((flags & WR_STATE) && !access_permit_write(stp))
3290                 goto out;
3291         if ((flags & RD_STATE) && !access_permit_read(stp))
3292                 goto out;
3293         status = nfs_ok;
3294 out:
3295         return status;
3296 }
3297
3298 static inline __be32
3299 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3300 {
3301         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3302                 return nfs_ok;
3303         else if (locks_in_grace(net)) {
3304                 /* Answer in remaining cases depends on existence of
3305                  * conflicting state; so we must wait out the grace period. */
3306                 return nfserr_grace;
3307         } else if (flags & WR_STATE)
3308                 return nfs4_share_conflict(current_fh,
3309                                 NFS4_SHARE_DENY_WRITE);
3310         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3311                 return nfs4_share_conflict(current_fh,
3312                                 NFS4_SHARE_DENY_READ);
3313 }
3314
3315 /*
3316  * Allow READ/WRITE during grace period on recovered state only for files
3317  * that are not able to provide mandatory locking.
3318  */
3319 static inline int
3320 grace_disallows_io(struct net *net, struct inode *inode)
3321 {
3322         return locks_in_grace(net) && mandatory_lock(inode);
3323 }
3324
3325 /* Returns true iff a is later than b: */
3326 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3327 {
3328         return (s32)a->si_generation - (s32)b->si_generation > 0;
3329 }
3330
3331 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3332 {
3333         /*
3334          * When sessions are used the stateid generation number is ignored
3335          * when it is zero.
3336          */
3337         if (has_session && in->si_generation == 0)
3338                 return nfs_ok;
3339
3340         if (in->si_generation == ref->si_generation)
3341                 return nfs_ok;
3342
3343         /* If the client sends us a stateid from the future, it's buggy: */
3344         if (stateid_generation_after(in, ref))
3345                 return nfserr_bad_stateid;
3346         /*
3347          * However, we could see a stateid from the past, even from a
3348          * non-buggy client.  For example, if the client sends a lock
3349          * while some IO is outstanding, the lock may bump si_generation
3350          * while the IO is still in flight.  The client could avoid that
3351          * situation by waiting for responses on all the IO requests,
3352          * but better performance may result in retrying IO that
3353          * receives an old_stateid error if requests are rarely
3354          * reordered in flight:
3355          */
3356         return nfserr_old_stateid;
3357 }
3358
3359 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3360 {
3361         struct nfs4_stid *s;
3362         struct nfs4_ol_stateid *ols;
3363         __be32 status;
3364
3365         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3366                 return nfserr_bad_stateid;
3367         /* Client debugging aid. */
3368         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3369                 char addr_str[INET6_ADDRSTRLEN];
3370                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3371                                  sizeof(addr_str));
3372                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3373                                         "with incorrect client ID\n", addr_str);
3374                 return nfserr_bad_stateid;
3375         }
3376         s = find_stateid(cl, stateid);
3377         if (!s)
3378                 return nfserr_bad_stateid;
3379         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3380         if (status)
3381                 return status;
3382         if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3383                 return nfs_ok;
3384         ols = openlockstateid(s);
3385         if (ols->st_stateowner->so_is_open_owner
3386             && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3387                 return nfserr_bad_stateid;
3388         return nfs_ok;
3389 }
3390
3391 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3392                                    struct nfs4_stid **s, bool sessions,
3393                                    struct nfsd_net *nn)
3394 {
3395         struct nfs4_client *cl;
3396         __be32 status;
3397
3398         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3399                 return nfserr_bad_stateid;
3400         status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3401                                                         nn, &cl);
3402         if (status == nfserr_stale_clientid)
3403                 return nfserr_stale_stateid;
3404         if (status)
3405                 return status;
3406         *s = find_stateid_by_type(cl, stateid, typemask);
3407         if (!*s)
3408                 return nfserr_bad_stateid;
3409         return nfs_ok;
3410 }
3411
3412 /*
3413 * Checks for stateid operations
3414 */
3415 __be32
3416 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3417                            stateid_t *stateid, int flags, struct file **filpp)
3418 {
3419         struct nfs4_stid *s;
3420         struct nfs4_ol_stateid *stp = NULL;
3421         struct nfs4_delegation *dp = NULL;
3422         struct svc_fh *current_fh = &cstate->current_fh;
3423         struct inode *ino = current_fh->fh_dentry->d_inode;
3424         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3425         __be32 status;
3426
3427         if (filpp)
3428                 *filpp = NULL;
3429
3430         if (grace_disallows_io(net, ino))
3431                 return nfserr_grace;
3432
3433         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3434                 return check_special_stateids(net, current_fh, stateid, flags);
3435
3436         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3437                                       &s, cstate->minorversion, nn);
3438         if (status)
3439                 return status;
3440         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3441         if (status)
3442                 goto out;
3443         switch (s->sc_type) {
3444         case NFS4_DELEG_STID:
3445                 dp = delegstateid(s);
3446                 status = nfs4_check_delegmode(dp, flags);
3447                 if (status)
3448                         goto out;
3449                 if (filpp) {
3450                         *filpp = dp->dl_file->fi_deleg_file;
3451                         if (!*filpp) {
3452                                 WARN_ON_ONCE(1);
3453                                 status = nfserr_serverfault;
3454                                 goto out;
3455                         }
3456                 }
3457                 break;
3458         case NFS4_OPEN_STID:
3459         case NFS4_LOCK_STID:
3460                 stp = openlockstateid(s);
3461                 status = nfs4_check_fh(current_fh, stp);
3462                 if (status)
3463                         goto out;
3464                 if (stp->st_stateowner->so_is_open_owner
3465                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3466                         goto out;
3467                 status = nfs4_check_openmode(stp, flags);
3468                 if (status)
3469                         goto out;
3470                 if (filpp) {
3471                         if (flags & RD_STATE)
3472                                 *filpp = find_readable_file(stp->st_file);
3473                         else
3474                                 *filpp = find_writeable_file(stp->st_file);
3475                 }
3476                 break;
3477         default:
3478                 return nfserr_bad_stateid;
3479         }
3480         status = nfs_ok;
3481 out:
3482         return status;
3483 }
3484
3485 static __be32
3486 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3487 {
3488         if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3489                 return nfserr_locks_held;
3490         release_lock_stateid(stp);
3491         return nfs_ok;
3492 }
3493
3494 /*
3495  * Test if the stateid is valid
3496  */
3497 __be32
3498 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3499                    struct nfsd4_test_stateid *test_stateid)
3500 {
3501         struct nfsd4_test_stateid_id *stateid;
3502         struct nfs4_client *cl = cstate->session->se_client;
3503
3504         nfs4_lock_state();
3505         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3506                 stateid->ts_id_status =
3507                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3508         nfs4_unlock_state();
3509
3510         return nfs_ok;
3511 }
3512
3513 __be32
3514 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3515                    struct nfsd4_free_stateid *free_stateid)
3516 {
3517         stateid_t *stateid = &free_stateid->fr_stateid;
3518         struct nfs4_stid *s;
3519         struct nfs4_client *cl = cstate->session->se_client;
3520         __be32 ret = nfserr_bad_stateid;
3521
3522         nfs4_lock_state();
3523         s = find_stateid(cl, stateid);
3524         if (!s)
3525                 goto out;
3526         switch (s->sc_type) {
3527         case NFS4_DELEG_STID:
3528                 ret = nfserr_locks_held;
3529                 goto out;
3530         case NFS4_OPEN_STID:
3531         case NFS4_LOCK_STID:
3532                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3533                 if (ret)
3534                         goto out;
3535                 if (s->sc_type == NFS4_LOCK_STID)
3536                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3537                 else
3538                         ret = nfserr_locks_held;
3539                 break;
3540         default:
3541                 ret = nfserr_bad_stateid;
3542         }
3543 out:
3544         nfs4_unlock_state();
3545         return ret;
3546 }
3547
3548 static inline int
3549 setlkflg (int type)
3550 {
3551         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3552                 RD_STATE : WR_STATE;
3553 }
3554
3555 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3556 {
3557         struct svc_fh *current_fh = &cstate->current_fh;
3558         struct nfs4_stateowner *sop = stp->st_stateowner;
3559         __be32 status;
3560
3561         status = nfsd4_check_seqid(cstate, sop, seqid);
3562         if (status)
3563                 return status;
3564         if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3565                 /*
3566                  * "Closed" stateid's exist *only* to return
3567                  * nfserr_replay_me from the previous step.
3568                  */
3569                 return nfserr_bad_stateid;
3570         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3571         if (status)
3572                 return status;
3573         return nfs4_check_fh(current_fh, stp);
3574 }
3575
3576 /*
3577  * Checks for sequence id mutating operations.
3578  */
3579 static __be32
3580 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3581                          stateid_t *stateid, char typemask,
3582                          struct nfs4_ol_stateid **stpp,
3583                          struct nfsd_net *nn)
3584 {
3585         __be32 status;
3586         struct nfs4_stid *s;
3587
3588         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3589                 seqid, STATEID_VAL(stateid));
3590
3591         *stpp = NULL;
3592         status = nfsd4_lookup_stateid(stateid, typemask, &s,
3593                                       cstate->minorversion, nn);
3594         if (status)
3595                 return status;
3596         *stpp = openlockstateid(s);
3597         cstate->replay_owner = (*stpp)->st_stateowner;
3598
3599         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3600 }
3601
3602 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3603                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3604 {
3605         __be32 status;
3606         struct nfs4_openowner *oo;
3607
3608         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3609                                                 NFS4_OPEN_STID, stpp, nn);
3610         if (status)
3611                 return status;
3612         oo = openowner((*stpp)->st_stateowner);
3613         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3614                 return nfserr_bad_stateid;
3615         return nfs_ok;
3616 }
3617
3618 __be32
3619 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3620                    struct nfsd4_open_confirm *oc)
3621 {
3622         __be32 status;
3623         struct nfs4_openowner *oo;
3624         struct nfs4_ol_stateid *stp;
3625         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3626
3627         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3628                         (int)cstate->current_fh.fh_dentry->d_name.len,
3629                         cstate->current_fh.fh_dentry->d_name.name);
3630
3631         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3632         if (status)
3633                 return status;
3634
3635         nfs4_lock_state();
3636
3637         status = nfs4_preprocess_seqid_op(cstate,
3638                                         oc->oc_seqid, &oc->oc_req_stateid,
3639                                         NFS4_OPEN_STID, &stp, nn);
3640         if (status)
3641                 goto out;
3642         oo = openowner(stp->st_stateowner);
3643         status = nfserr_bad_stateid;
3644         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3645                 goto out;
3646         oo->oo_flags |= NFS4_OO_CONFIRMED;
3647         update_stateid(&stp->st_stid.sc_stateid);
3648         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3649         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3650                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3651
3652         nfsd4_client_record_create(oo->oo_owner.so_client);
3653         status = nfs_ok;
3654 out:
3655         if (!cstate->replay_owner)
3656                 nfs4_unlock_state();
3657         return status;
3658 }
3659
3660 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3661 {
3662         if (!test_access(access, stp))
3663                 return;
3664         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3665         clear_access(access, stp);
3666 }
3667
3668 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3669 {
3670         switch (to_access) {
3671         case NFS4_SHARE_ACCESS_READ:
3672                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3673                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3674                 break;
3675         case NFS4_SHARE_ACCESS_WRITE:
3676                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3677                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3678                 break;
3679         case NFS4_SHARE_ACCESS_BOTH:
3680                 break;
3681         default:
3682                 WARN_ON_ONCE(1);
3683         }
3684 }
3685
3686 static void
3687 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3688 {
3689         int i;
3690         for (i = 0; i < 4; i++) {
3691                 if ((i & deny) != i)
3692                         clear_deny(i, stp);
3693         }
3694 }
3695
3696 __be32
3697 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3698                      struct nfsd4_compound_state *cstate,
3699                      struct nfsd4_open_downgrade *od)
3700 {
3701         __be32 status;
3702         struct nfs4_ol_stateid *stp;
3703         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3704
3705         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3706                         (int)cstate->current_fh.fh_dentry->d_name.len,
3707                         cstate->current_fh.fh_dentry->d_name.name);
3708
3709         /* We don't yet support WANT bits: */
3710         if (od->od_deleg_want)
3711                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3712                         od->od_deleg_want);
3713
3714         nfs4_lock_state();
3715         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3716                                         &od->od_stateid, &stp, nn);
3717         if (status)
3718                 goto out;
3719         status = nfserr_inval;
3720         if (!test_access(od->od_share_access, stp)) {
3721                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3722                         stp->st_access_bmap, od->od_share_access);
3723                 goto out;
3724         }
3725         if (!test_deny(od->od_share_deny, stp)) {
3726                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3727                         stp->st_deny_bmap, od->od_share_deny);
3728                 goto out;
3729         }
3730         nfs4_stateid_downgrade(stp, od->od_share_access);
3731
3732         reset_union_bmap_deny(od->od_share_deny, stp);
3733
3734         update_stateid(&stp->st_stid.sc_stateid);
3735         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3736         status = nfs_ok;
3737 out:
3738         if (!cstate->replay_owner)
3739                 nfs4_unlock_state();
3740         return status;
3741 }
3742
3743 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3744 {
3745         struct nfs4_openowner *oo;
3746         struct nfs4_ol_stateid *s;
3747
3748         if (!so->so_is_open_owner)
3749                 return;
3750         oo = openowner(so);
3751         s = oo->oo_last_closed_stid;
3752         if (!s)
3753                 return;
3754         if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3755                 /* Release the last_closed_stid on the next seqid bump: */
3756                 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3757                 return;
3758         }
3759         oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3760         release_last_closed_stateid(oo);
3761 }
3762
3763 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3764 {
3765         unhash_open_stateid(s);
3766         s->st_stid.sc_type = NFS4_CLOSED_STID;
3767 }
3768
3769 /*
3770  * nfs4_unlock_state() called after encode
3771  */
3772 __be32
3773 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3774             struct nfsd4_close *close)
3775 {
3776         __be32 status;
3777         struct nfs4_openowner *oo;
3778         struct nfs4_ol_stateid *stp;
3779         struct net *net = SVC_NET(rqstp);
3780         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3781
3782         dprintk("NFSD: nfsd4_close on file %.*s\n",
3783                         (int)cstate->current_fh.fh_dentry->d_name.len,
3784                         cstate->current_fh.fh_dentry->d_name.name);
3785
3786         nfs4_lock_state();
3787         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3788                                         &close->cl_stateid,
3789                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
3790                                         &stp, nn);
3791         if (status)
3792                 goto out;
3793         oo = openowner(stp->st_stateowner);
3794         status = nfs_ok;
3795         update_stateid(&stp->st_stid.sc_stateid);
3796         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3797
3798         nfsd4_close_open_stateid(stp);
3799         release_last_closed_stateid(oo);
3800         oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3801         oo->oo_last_closed_stid = stp;
3802
3803         if (list_empty(&oo->oo_owner.so_stateids)) {
3804                 if (cstate->minorversion) {
3805                         release_openowner(oo);
3806                         cstate->replay_owner = NULL;
3807                 } else {
3808                         /*
3809                          * In the 4.0 case we need to keep the owners around a
3810                          * little while to handle CLOSE replay.
3811                          */
3812                         if (list_empty(&oo->oo_owner.so_stateids))
3813                                 move_to_close_lru(oo, SVC_NET(rqstp));
3814                 }
3815         }
3816 out:
3817         if (!cstate->replay_owner)
3818                 nfs4_unlock_state();
3819         return status;
3820 }
3821
3822 __be32
3823 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3824                   struct nfsd4_delegreturn *dr)
3825 {
3826         struct nfs4_delegation *dp;
3827         stateid_t *stateid = &dr->dr_stateid;
3828         struct nfs4_stid *s;
3829         __be32 status;
3830         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3831
3832         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3833                 return status;
3834
3835         nfs4_lock_state();
3836         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
3837                                       cstate->minorversion, nn);
3838         if (status)
3839                 goto out;
3840         dp = delegstateid(s);
3841         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3842         if (status)
3843                 goto out;
3844
3845         unhash_delegation(dp);
3846 out:
3847         nfs4_unlock_state();
3848
3849         return status;
3850 }
3851
3852
3853 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
3854
3855 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3856
3857 static inline u64
3858 end_offset(u64 start, u64 len)
3859 {
3860         u64 end;
3861
3862         end = start + len;
3863         return end >= start ? end: NFS4_MAX_UINT64;
3864 }
3865
3866 /* last octet in a range */
3867 static inline u64
3868 last_byte_offset(u64 start, u64 len)
3869 {
3870         u64 end;
3871
3872         WARN_ON_ONCE(!len);
3873         end = start + len;
3874         return end > start ? end - 1: NFS4_MAX_UINT64;
3875 }
3876
3877 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
3878 {
3879         return (file_hashval(inode) + cl_id
3880                         + opaque_hashval(ownername->data, ownername->len))
3881                 & LOCKOWNER_INO_HASH_MASK;
3882 }
3883
3884 /*
3885  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3886  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3887  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
3888  * locking, this prevents us from being completely protocol-compliant.  The
3889  * real solution to this problem is to start using unsigned file offsets in
3890  * the VFS, but this is a very deep change!
3891  */
3892 static inline void
3893 nfs4_transform_lock_offset(struct file_lock *lock)
3894 {
3895         if (lock->fl_start < 0)
3896                 lock->fl_start = OFFSET_MAX;
3897         if (lock->fl_end < 0)
3898                 lock->fl_end = OFFSET_MAX;
3899 }
3900
3901 /* Hack!: For now, we're defining this just so we can use a pointer to it
3902  * as a unique cookie to identify our (NFSv4's) posix locks. */
3903 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
3904 };
3905
3906 static inline void
3907 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3908 {
3909         struct nfs4_lockowner *lo;
3910
3911         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3912                 lo = (struct nfs4_lockowner *) fl->fl_owner;
3913                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3914                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
3915                 if (!deny->ld_owner.data)
3916                         /* We just don't care that much */
3917                         goto nevermind;
3918                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3919                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3920         } else {
3921 nevermind:
3922                 deny->ld_owner.len = 0;
3923                 deny->ld_owner.data = NULL;
3924                 deny->ld_clientid.cl_boot = 0;
3925                 deny->ld_clientid.cl_id = 0;
3926         }
3927         deny->ld_start = fl->fl_start;
3928         deny->ld_length = NFS4_MAX_UINT64;
3929         if (fl->fl_end != NFS4_MAX_UINT64)
3930                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3931         deny->ld_type = NFS4_READ_LT;
3932         if (fl->fl_type != F_RDLCK)
3933                 deny->ld_type = NFS4_WRITE_LT;
3934 }
3935
3936 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3937 {
3938         struct nfs4_ol_stateid *lst;
3939
3940         if (!same_owner_str(&lo->lo_owner, owner, clid))
3941                 return false;
3942         lst = list_first_entry(&lo->lo_owner.so_stateids,
3943                                struct nfs4_ol_stateid, st_perstateowner);
3944         return lst->st_file->fi_inode == inode;
3945 }
3946
3947 static struct nfs4_lockowner *
3948 find_lockowner_str(struct inode *inode, clientid_t *clid,
3949                    struct xdr_netobj *owner, struct nfsd_net *nn)
3950 {
3951         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
3952         struct nfs4_lockowner *lo;
3953
3954         list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
3955                 if (same_lockowner_ino(lo, inode, clid, owner))
3956                         return lo;
3957         }
3958         return NULL;
3959 }
3960
3961 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3962 {
3963         struct inode *inode = open_stp->st_file->fi_inode;
3964         unsigned int inohash = lockowner_ino_hashval(inode,
3965                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3966         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3967
3968         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
3969         list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
3970         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3971 }
3972
3973 /*
3974  * Alloc a lock owner structure.
3975  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3976  * occurred.
3977  *
3978  * strhashval = ownerstr_hashval
3979  */
3980
3981 static struct nfs4_lockowner *
3982 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
3983         struct nfs4_lockowner *lo;
3984
3985         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
3986         if (!lo)
3987                 return NULL;
3988         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
3989         lo->lo_owner.so_is_open_owner = 0;
3990         /* It is the openowner seqid that will be incremented in encode in the
3991          * case of new lockowners; so increment the lock seqid manually: */
3992         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
3993         hash_lockowner(lo, strhashval, clp, open_stp);
3994         return lo;
3995 }
3996
3997 static struct nfs4_ol_stateid *
3998 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
3999 {
4000         struct nfs4_ol_stateid *stp;
4001         struct nfs4_client *clp = lo->lo_owner.so_client;
4002
4003         stp = nfs4_alloc_stateid(clp);
4004         if (stp == NULL)
4005                 return NULL;
4006         stp->st_stid.sc_type = NFS4_LOCK_STID;
4007         list_add(&stp->st_perfile, &fp->fi_stateids);
4008         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4009         stp->st_stateowner = &lo->lo_owner;
4010         get_nfs4_file(fp);
4011         stp->st_file = fp;
4012         stp->st_access_bmap = 0;
4013         stp->st_deny_bmap = open_stp->st_deny_bmap;
4014         stp->st_openstp = open_stp;
4015         return stp;
4016 }
4017
4018 static int
4019 check_lock_length(u64 offset, u64 length)
4020 {
4021         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4022              LOFF_OVERFLOW(offset, length)));
4023 }
4024
4025 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4026 {
4027         struct nfs4_file *fp = lock_stp->st_file;
4028         int oflag = nfs4_access_to_omode(access);
4029
4030         if (test_access(access, lock_stp))
4031                 return;
4032         nfs4_file_get_access(fp, oflag);
4033         set_access(access, lock_stp);
4034 }
4035
4036 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)
4037 {
4038         struct nfs4_file *fi = ost->st_file;
4039         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4040         struct nfs4_client *cl = oo->oo_owner.so_client;
4041         struct nfs4_lockowner *lo;
4042         unsigned int strhashval;
4043         struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4044
4045         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4046                                 &lock->v.new.owner, nn);
4047         if (lo) {
4048                 if (!cstate->minorversion)
4049                         return nfserr_bad_seqid;
4050                 /* XXX: a lockowner always has exactly one stateid: */
4051                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4052                                 struct nfs4_ol_stateid, st_perstateowner);
4053                 return nfs_ok;
4054         }
4055         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4056                         &lock->v.new.owner);
4057         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4058         if (lo == NULL)
4059                 return nfserr_jukebox;
4060         *lst = alloc_init_lock_stateid(lo, fi, ost);
4061         if (*lst == NULL) {
4062                 release_lockowner(lo);
4063                 return nfserr_jukebox;
4064         }
4065         *new = true;
4066         return nfs_ok;
4067 }
4068
4069 /*
4070  *  LOCK operation
4071  */
4072 __be32
4073 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4074            struct nfsd4_lock *lock)
4075 {
4076         struct nfs4_openowner *open_sop = NULL;
4077         struct nfs4_lockowner *lock_sop = NULL;
4078         struct nfs4_ol_stateid *lock_stp;
4079         struct file *filp = NULL;
4080         struct file_lock *file_lock = NULL;
4081         struct file_lock *conflock = NULL;
4082         __be32 status = 0;
4083         bool new_state = false;
4084         int lkflg;
4085         int err;
4086         struct net *net = SVC_NET(rqstp);
4087         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4088
4089         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4090                 (long long) lock->lk_offset,
4091                 (long long) lock->lk_length);
4092
4093         if (check_lock_length(lock->lk_offset, lock->lk_length))
4094                  return nfserr_inval;
4095
4096         if ((status = fh_verify(rqstp, &cstate->current_fh,
4097                                 S_IFREG, NFSD_MAY_LOCK))) {
4098                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4099                 return status;
4100         }
4101
4102         nfs4_lock_state();
4103
4104         if (lock->lk_is_new) {
4105                 struct nfs4_ol_stateid *open_stp = NULL;
4106
4107                 if (nfsd4_has_session(cstate))
4108                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4109                         memcpy(&lock->v.new.clientid,
4110                                 &cstate->session->se_client->cl_clientid,
4111                                 sizeof(clientid_t));
4112
4113                 status = nfserr_stale_clientid;
4114                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4115                         goto out;
4116
4117                 /* validate and update open stateid and open seqid */
4118                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4119                                         lock->lk_new_open_seqid,
4120                                         &lock->lk_new_open_stateid,
4121                                         &open_stp, nn);
4122                 if (status)
4123                         goto out;
4124                 open_sop = openowner(open_stp->st_stateowner);
4125                 status = nfserr_bad_stateid;
4126                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4127                                                 &lock->v.new.clientid))
4128                         goto out;
4129                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4130                                                         &lock_stp, &new_state);
4131         } else
4132                 status = nfs4_preprocess_seqid_op(cstate,
4133                                        lock->lk_old_lock_seqid,
4134                                        &lock->lk_old_lock_stateid,
4135                                        NFS4_LOCK_STID, &lock_stp, nn);
4136         if (status)
4137                 goto out;
4138         lock_sop = lockowner(lock_stp->st_stateowner);
4139
4140         lkflg = setlkflg(lock->lk_type);
4141         status = nfs4_check_openmode(lock_stp, lkflg);
4142         if (status)
4143                 goto out;
4144
4145         status = nfserr_grace;
4146         if (locks_in_grace(net) && !lock->lk_reclaim)
4147                 goto out;
4148         status = nfserr_no_grace;
4149         if (!locks_in_grace(net) && lock->lk_reclaim)
4150                 goto out;
4151
4152         file_lock = locks_alloc_lock();
4153         if (!file_lock) {
4154                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4155                 status = nfserr_jukebox;
4156                 goto out;
4157         }
4158
4159         locks_init_lock(file_lock);
4160         switch (lock->lk_type) {
4161                 case NFS4_READ_LT:
4162                 case NFS4_READW_LT:
4163                         filp = find_readable_file(lock_stp->st_file);
4164                         if (filp)
4165                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4166                         file_lock->fl_type = F_RDLCK;
4167                         break;
4168                 case NFS4_WRITE_LT:
4169                 case NFS4_WRITEW_LT:
4170                         filp = find_writeable_file(lock_stp->st_file);
4171                         if (filp)
4172                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4173                         file_lock->fl_type = F_WRLCK;
4174                         break;
4175                 default:
4176                         status = nfserr_inval;
4177                 goto out;
4178         }
4179         if (!filp) {
4180                 status = nfserr_openmode;
4181                 goto out;
4182         }
4183         file_lock->fl_owner = (fl_owner_t)lock_sop;
4184         file_lock->fl_pid = current->tgid;
4185         file_lock->fl_file = filp;
4186         file_lock->fl_flags = FL_POSIX;
4187         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4188         file_lock->fl_start = lock->lk_offset;
4189         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4190         nfs4_transform_lock_offset(file_lock);
4191
4192         conflock = locks_alloc_lock();
4193         if (!conflock) {
4194                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4195                 status = nfserr_jukebox;
4196                 goto out;
4197         }
4198
4199         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4200         switch (-err) {
4201         case 0: /* success! */
4202                 update_stateid(&lock_stp->st_stid.sc_stateid);
4203                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4204                                 sizeof(stateid_t));
4205                 status = 0;
4206                 break;
4207         case (EAGAIN):          /* conflock holds conflicting lock */
4208                 status = nfserr_denied;
4209                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4210                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4211                 break;
4212         case (EDEADLK):
4213                 status = nfserr_deadlock;
4214                 break;
4215         default:
4216                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4217                 status = nfserrno(err);
4218                 break;
4219         }
4220 out:
4221         if (status && new_state)
4222                 release_lockowner(lock_sop);
4223         if (!cstate->replay_owner)
4224                 nfs4_unlock_state();
4225         if (file_lock)
4226                 locks_free_lock(file_lock);
4227         if (conflock)
4228                 locks_free_lock(conflock);
4229         return status;
4230 }
4231
4232 /*
4233  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4234  * so we do a temporary open here just to get an open file to pass to
4235  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4236  * inode operation.)
4237  */
4238 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4239 {
4240         struct file *file;
4241         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4242         if (!err) {
4243                 err = nfserrno(vfs_test_lock(file, lock));
4244                 nfsd_close(file);
4245         }
4246         return err;
4247 }
4248
4249 /*
4250  * LOCKT operation
4251  */
4252 __be32
4253 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4254             struct nfsd4_lockt *lockt)
4255 {
4256         struct inode *inode;
4257         struct file_lock *file_lock = NULL;
4258         struct nfs4_lockowner *lo;
4259         __be32 status;
4260         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4261
4262         if (locks_in_grace(SVC_NET(rqstp)))
4263                 return nfserr_grace;
4264
4265         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4266                  return nfserr_inval;
4267
4268         nfs4_lock_state();
4269
4270         if (!nfsd4_has_session(cstate)) {
4271                 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4272                 if (status)
4273                         goto out;
4274         }
4275
4276         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4277                 goto out;
4278
4279         inode = cstate->current_fh.fh_dentry->d_inode;
4280         file_lock = locks_alloc_lock();
4281         if (!file_lock) {
4282                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4283                 status = nfserr_jukebox;
4284                 goto out;
4285         }
4286         locks_init_lock(file_lock);
4287         switch (lockt->lt_type) {
4288                 case NFS4_READ_LT:
4289                 case NFS4_READW_LT:
4290                         file_lock->fl_type = F_RDLCK;
4291                 break;
4292                 case NFS4_WRITE_LT:
4293                 case NFS4_WRITEW_LT:
4294                         file_lock->fl_type = F_WRLCK;
4295                 break;
4296                 default:
4297                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4298                         status = nfserr_inval;
4299                 goto out;
4300         }
4301
4302         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4303         if (lo)
4304                 file_lock->fl_owner = (fl_owner_t)lo;
4305         file_lock->fl_pid = current->tgid;
4306         file_lock->fl_flags = FL_POSIX;
4307
4308         file_lock->fl_start = lockt->lt_offset;
4309         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4310
4311         nfs4_transform_lock_offset(file_lock);
4312
4313         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4314         if (status)
4315                 goto out;
4316
4317         if (file_lock->fl_type != F_UNLCK) {
4318                 status = nfserr_denied;
4319                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4320         }
4321 out:
4322         nfs4_unlock_state();
4323         if (file_lock)
4324                 locks_free_lock(file_lock);
4325         return status;
4326 }
4327
4328 __be32
4329 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4330             struct nfsd4_locku *locku)
4331 {
4332         struct nfs4_ol_stateid *stp;
4333         struct file *filp = NULL;
4334         struct file_lock *file_lock = NULL;
4335         __be32 status;
4336         int err;
4337         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4338
4339         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4340                 (long long) locku->lu_offset,
4341                 (long long) locku->lu_length);
4342
4343         if (check_lock_length(locku->lu_offset, locku->lu_length))
4344                  return nfserr_inval;
4345
4346         nfs4_lock_state();
4347
4348         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4349                                         &locku->lu_stateid, NFS4_LOCK_STID,
4350                                         &stp, nn);
4351         if (status)
4352                 goto out;
4353         filp = find_any_file(stp->st_file);
4354         if (!filp) {
4355                 status = nfserr_lock_range;
4356                 goto out;
4357         }
4358         file_lock = locks_alloc_lock();
4359         if (!file_lock) {
4360                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4361                 status = nfserr_jukebox;
4362                 goto out;
4363         }
4364         locks_init_lock(file_lock);
4365         file_lock->fl_type = F_UNLCK;
4366         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4367         file_lock->fl_pid = current->tgid;
4368         file_lock->fl_file = filp;
4369         file_lock->fl_flags = FL_POSIX;
4370         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4371         file_lock->fl_start = locku->lu_offset;
4372
4373         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4374                                                 locku->lu_length);
4375         nfs4_transform_lock_offset(file_lock);
4376
4377         /*
4378         *  Try to unlock the file in the VFS.
4379         */
4380         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4381         if (err) {
4382                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4383                 goto out_nfserr;
4384         }
4385         /*
4386         * OK, unlock succeeded; the only thing left to do is update the stateid.
4387         */
4388         update_stateid(&stp->st_stid.sc_stateid);
4389         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4390
4391 out:
4392         if (!cstate->replay_owner)
4393                 nfs4_unlock_state();
4394         if (file_lock)
4395                 locks_free_lock(file_lock);
4396         return status;
4397
4398 out_nfserr:
4399         status = nfserrno(err);
4400         goto out;
4401 }
4402
4403 /*
4404  * returns
4405  *      1: locks held by lockowner
4406  *      0: no locks held by lockowner
4407  */
4408 static int
4409 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4410 {
4411         struct file_lock **flpp;
4412         struct inode *inode = filp->fi_inode;
4413         int status = 0;
4414
4415         lock_flocks();
4416         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4417                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4418                         status = 1;
4419                         goto out;
4420                 }
4421         }
4422 out:
4423         unlock_flocks();
4424         return status;
4425 }
4426
4427 __be32
4428 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4429                         struct nfsd4_compound_state *cstate,
4430                         struct nfsd4_release_lockowner *rlockowner)
4431 {
4432         clientid_t *clid = &rlockowner->rl_clientid;
4433         struct nfs4_stateowner *sop;
4434         struct nfs4_lockowner *lo;
4435         struct nfs4_ol_stateid *stp;
4436         struct xdr_netobj *owner = &rlockowner->rl_owner;
4437         struct list_head matches;
4438         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4439         __be32 status;
4440         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4441
4442         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4443                 clid->cl_boot, clid->cl_id);
4444
4445         nfs4_lock_state();
4446
4447         status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4448         if (status)
4449                 goto out;
4450
4451         status = nfserr_locks_held;
4452         INIT_LIST_HEAD(&matches);
4453
4454         list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4455                 if (sop->so_is_open_owner)
4456                         continue;
4457                 if (!same_owner_str(sop, owner, clid))
4458                         continue;
4459                 list_for_each_entry(stp, &sop->so_stateids,
4460                                 st_perstateowner) {
4461                         lo = lockowner(sop);
4462                         if (check_for_locks(stp->st_file, lo))
4463                                 goto out;
4464                         list_add(&lo->lo_list, &matches);
4465                 }
4466         }
4467         /* Clients probably won't expect us to return with some (but not all)
4468          * of the lockowner state released; so don't release any until all
4469          * have been checked. */
4470         status = nfs_ok;
4471         while (!list_empty(&matches)) {
4472                 lo = list_entry(matches.next, struct nfs4_lockowner,
4473                                                                 lo_list);
4474                 /* unhash_stateowner deletes so_perclient only
4475                  * for openowners. */
4476                 list_del(&lo->lo_list);
4477                 release_lockowner(lo);
4478         }
4479 out:
4480         nfs4_unlock_state();
4481         return status;
4482 }
4483
4484 static inline struct nfs4_client_reclaim *
4485 alloc_reclaim(void)
4486 {
4487         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4488 }
4489
4490 bool
4491 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4492 {
4493         struct nfs4_client_reclaim *crp;
4494
4495         crp = nfsd4_find_reclaim_client(name, nn);
4496         return (crp && crp->cr_clp);
4497 }
4498
4499 /*
4500  * failure => all reset bets are off, nfserr_no_grace...
4501  */
4502 struct nfs4_client_reclaim *
4503 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4504 {
4505         unsigned int strhashval;
4506         struct nfs4_client_reclaim *crp;
4507
4508         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4509         crp = alloc_reclaim();
4510         if (crp) {
4511                 strhashval = clientstr_hashval(name);
4512                 INIT_LIST_HEAD(&crp->cr_strhash);
4513                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4514                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4515                 crp->cr_clp = NULL;
4516                 nn->reclaim_str_hashtbl_size++;
4517         }
4518         return crp;
4519 }
4520
4521 void
4522 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4523 {
4524         list_del(&crp->cr_strhash);
4525         kfree(crp);
4526         nn->reclaim_str_hashtbl_size--;
4527 }
4528
4529 void
4530 nfs4_release_reclaim(struct nfsd_net *nn)
4531 {
4532         struct nfs4_client_reclaim *crp = NULL;
4533         int i;
4534
4535         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4536                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4537                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4538                                         struct nfs4_client_reclaim, cr_strhash);
4539                         nfs4_remove_reclaim_record(crp, nn);
4540                 }
4541         }
4542         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4543 }
4544
4545 /*
4546  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4547 struct nfs4_client_reclaim *
4548 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4549 {
4550         unsigned int strhashval;
4551         struct nfs4_client_reclaim *crp = NULL;
4552
4553         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4554
4555         strhashval = clientstr_hashval(recdir);
4556         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4557                 if (same_name(crp->cr_recdir, recdir)) {
4558                         return crp;
4559                 }
4560         }
4561         return NULL;
4562 }
4563
4564 /*
4565 * Called from OPEN. Look for clientid in reclaim list.
4566 */
4567 __be32
4568 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4569 {
4570         struct nfs4_client *clp;
4571
4572         /* find clientid in conf_id_hashtbl */
4573         clp = find_confirmed_client(clid, sessions, nn);
4574         if (clp == NULL)
4575                 return nfserr_reclaim_bad;
4576
4577         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4578 }
4579
4580 #ifdef CONFIG_NFSD_FAULT_INJECTION
4581
4582 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4583 {
4584         expire_client(clp);
4585         return 1;
4586 }
4587
4588 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4589 {
4590         char buf[INET6_ADDRSTRLEN];
4591         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4592         printk(KERN_INFO "NFS Client: %s\n", buf);
4593         return 1;
4594 }
4595
4596 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4597                              const char *type)
4598 {
4599         char buf[INET6_ADDRSTRLEN];
4600         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4601         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4602 }
4603
4604 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4605 {
4606         struct nfs4_openowner *oop;
4607         struct nfs4_lockowner *lop, *lo_next;
4608         struct nfs4_ol_stateid *stp, *st_next;
4609         u64 count = 0;
4610
4611         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4612                 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4613                         list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4614                                 if (func)
4615                                         func(lop);
4616                                 if (++count == max)
4617                                         return count;
4618                         }
4619                 }
4620         }
4621
4622         return count;
4623 }
4624
4625 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4626 {
4627         return nfsd_foreach_client_lock(clp, max, release_lockowner);
4628 }
4629
4630 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4631 {
4632         u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4633         nfsd_print_count(clp, count, "locked files");
4634         return count;
4635 }
4636
4637 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4638 {
4639         struct nfs4_openowner *oop, *next;
4640         u64 count = 0;
4641
4642         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4643                 if (func)
4644                         func(oop);
4645                 if (++count == max)
4646                         break;
4647         }
4648
4649         return count;
4650 }
4651
4652 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4653 {
4654         return nfsd_foreach_client_open(clp, max, release_openowner);
4655 }
4656
4657 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4658 {
4659         u64 count = nfsd_foreach_client_open(clp, max, NULL);
4660         nfsd_print_count(clp, count, "open files");
4661         return count;
4662 }
4663
4664 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4665                                      struct list_head *victims)
4666 {
4667         struct nfs4_delegation *dp, *next;
4668         u64 count = 0;
4669
4670         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4671                 if (victims)
4672                         list_move(&dp->dl_recall_lru, victims);
4673                 if (++count == max)
4674                         break;
4675         }
4676         return count;
4677 }
4678
4679 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4680 {
4681         struct nfs4_delegation *dp, *next;
4682         LIST_HEAD(victims);
4683         u64 count;
4684
4685         spin_lock(&recall_lock);
4686         count = nfsd_find_all_delegations(clp, max, &victims);
4687         spin_unlock(&recall_lock);
4688
4689         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4690                 unhash_delegation(dp);
4691
4692         return count;
4693 }
4694
4695 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4696 {
4697         struct nfs4_delegation *dp, *next;
4698         LIST_HEAD(victims);
4699         u64 count;
4700
4701         spin_lock(&recall_lock);
4702         count = nfsd_find_all_delegations(clp, max, &victims);
4703         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4704                 nfsd_break_one_deleg(dp);
4705         spin_unlock(&recall_lock);
4706
4707         return count;
4708 }
4709
4710 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4711 {
4712         u64 count = 0;
4713
4714         spin_lock(&recall_lock);
4715         count = nfsd_find_all_delegations(clp, max, NULL);
4716         spin_unlock(&recall_lock);
4717
4718         nfsd_print_count(clp, count, "delegations");
4719         return count;
4720 }
4721
4722 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4723 {
4724         struct nfs4_client *clp, *next;
4725         u64 count = 0;
4726         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4727
4728         if (!nfsd_netns_ready(nn))
4729                 return 0;
4730
4731         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4732                 count += func(clp, max - count);
4733                 if ((max != 0) && (count >= max))
4734                         break;
4735         }
4736
4737         return count;
4738 }
4739
4740 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4741 {
4742         struct nfs4_client *clp;
4743         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4744
4745         if (!nfsd_netns_ready(nn))
4746                 return NULL;
4747
4748         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4749                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
4750                         return clp;
4751         }
4752         return NULL;
4753 }
4754
4755 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4756
4757 /* initialization to perform at module load time: */
4758
4759 void
4760 nfs4_state_init(void)
4761 {
4762         int i;
4763
4764         for (i = 0; i < FILE_HASH_SIZE; i++) {
4765                 INIT_LIST_HEAD(&file_hashtbl[i]);
4766         }
4767         INIT_LIST_HEAD(&del_recall_lru);
4768 }
4769
4770 /*
4771  * Since the lifetime of a delegation isn't limited to that of an open, a
4772  * client may quite reasonably hang on to a delegation as long as it has
4773  * the inode cached.  This becomes an obvious problem the first time a
4774  * client's inode cache approaches the size of the server's total memory.
4775  *
4776  * For now we avoid this problem by imposing a hard limit on the number
4777  * of delegations, which varies according to the server's memory size.
4778  */
4779 static void
4780 set_max_delegations(void)
4781 {
4782         /*
4783          * Allow at most 4 delegations per megabyte of RAM.  Quick
4784          * estimates suggest that in the worst case (where every delegation
4785          * is for a different inode), a delegation could take about 1.5K,
4786          * giving a worst case usage of about 6% of memory.
4787          */
4788         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4789 }
4790
4791 static int nfs4_state_create_net(struct net *net)
4792 {
4793         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4794         int i;
4795
4796         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4797                         CLIENT_HASH_SIZE, GFP_KERNEL);
4798         if (!nn->conf_id_hashtbl)
4799                 goto err;
4800         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4801                         CLIENT_HASH_SIZE, GFP_KERNEL);
4802         if (!nn->unconf_id_hashtbl)
4803                 goto err_unconf_id;
4804         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
4805                         OWNER_HASH_SIZE, GFP_KERNEL);
4806         if (!nn->ownerstr_hashtbl)
4807                 goto err_ownerstr;
4808         nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
4809                         LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
4810         if (!nn->lockowner_ino_hashtbl)
4811                 goto err_lockowner_ino;
4812         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
4813                         SESSION_HASH_SIZE, GFP_KERNEL);
4814         if (!nn->sessionid_hashtbl)
4815                 goto err_sessionid;
4816
4817         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4818                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
4819                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
4820         }
4821         for (i = 0; i < OWNER_HASH_SIZE; i++)
4822                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
4823         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4824                 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
4825         for (i = 0; i < SESSION_HASH_SIZE; i++)
4826                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
4827         nn->conf_name_tree = RB_ROOT;
4828         nn->unconf_name_tree = RB_ROOT;
4829         INIT_LIST_HEAD(&nn->client_lru);
4830         INIT_LIST_HEAD(&nn->close_lru);
4831         spin_lock_init(&nn->client_lock);
4832
4833         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
4834         get_net(net);
4835
4836         return 0;
4837
4838 err_sessionid:
4839         kfree(nn->lockowner_ino_hashtbl);
4840 err_lockowner_ino:
4841         kfree(nn->ownerstr_hashtbl);
4842 err_ownerstr:
4843         kfree(nn->unconf_id_hashtbl);
4844 err_unconf_id:
4845         kfree(nn->conf_id_hashtbl);
4846 err:
4847         return -ENOMEM;
4848 }
4849
4850 static void
4851 nfs4_state_destroy_net(struct net *net)
4852 {
4853         int i;
4854         struct nfs4_client *clp = NULL;
4855         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4856         struct rb_node *node, *tmp;
4857
4858         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4859                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
4860                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4861                         destroy_client(clp);
4862                 }
4863         }
4864
4865         node = rb_first(&nn->unconf_name_tree);
4866         while (node != NULL) {
4867                 tmp = node;
4868                 node = rb_next(tmp);
4869                 clp = rb_entry(tmp, struct nfs4_client, cl_namenode);
4870                 rb_erase(tmp, &nn->unconf_name_tree);
4871                 destroy_client(clp);
4872         }
4873
4874         kfree(nn->sessionid_hashtbl);
4875         kfree(nn->lockowner_ino_hashtbl);
4876         kfree(nn->ownerstr_hashtbl);
4877         kfree(nn->unconf_id_hashtbl);
4878         kfree(nn->conf_id_hashtbl);
4879         put_net(net);
4880 }
4881
4882 int
4883 nfs4_state_start_net(struct net *net)
4884 {
4885         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4886         int ret;
4887
4888         ret = nfs4_state_create_net(net);
4889         if (ret)
4890                 return ret;
4891         nfsd4_client_tracking_init(net);
4892         nn->boot_time = get_seconds();
4893         locks_start_grace(net, &nn->nfsd4_manager);
4894         nn->grace_ended = false;
4895         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
4896                nn->nfsd4_grace, net);
4897         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
4898         return 0;
4899 }
4900
4901 /* initialization to perform when the nfsd service is started: */
4902
4903 int
4904 nfs4_state_start(void)
4905 {
4906         int ret;
4907
4908         ret = set_callback_cred();
4909         if (ret)
4910                 return -ENOMEM;
4911         laundry_wq = create_singlethread_workqueue("nfsd4");
4912         if (laundry_wq == NULL) {
4913                 ret = -ENOMEM;
4914                 goto out_recovery;
4915         }
4916         ret = nfsd4_create_callback_queue();
4917         if (ret)
4918                 goto out_free_laundry;
4919
4920         set_max_delegations();
4921
4922         return 0;
4923
4924 out_free_laundry:
4925         destroy_workqueue(laundry_wq);
4926 out_recovery:
4927         return ret;
4928 }
4929
4930 /* should be called with the state lock held */
4931 void
4932 nfs4_state_shutdown_net(struct net *net)
4933 {
4934         struct nfs4_delegation *dp = NULL;
4935         struct list_head *pos, *next, reaplist;
4936         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4937
4938         cancel_delayed_work_sync(&nn->laundromat_work);
4939         locks_end_grace(&nn->nfsd4_manager);
4940
4941         INIT_LIST_HEAD(&reaplist);
4942         spin_lock(&recall_lock);
4943         list_for_each_safe(pos, next, &del_recall_lru) {
4944                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4945                 if (dp->dl_stid.sc_client->net != net)
4946                         continue;
4947                 list_move(&dp->dl_recall_lru, &reaplist);
4948         }
4949         spin_unlock(&recall_lock);
4950         list_for_each_safe(pos, next, &reaplist) {
4951                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4952                 unhash_delegation(dp);
4953         }
4954
4955         nfsd4_client_tracking_exit(net);
4956         nfs4_state_destroy_net(net);
4957 }
4958
4959 void
4960 nfs4_state_shutdown(void)
4961 {
4962         destroy_workqueue(laundry_wq);
4963         nfsd4_destroy_callback_queue();
4964 }
4965
4966 static void
4967 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4968 {
4969         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4970                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
4971 }
4972
4973 static void
4974 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4975 {
4976         if (cstate->minorversion) {
4977                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4978                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4979         }
4980 }
4981
4982 void
4983 clear_current_stateid(struct nfsd4_compound_state *cstate)
4984 {
4985         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4986 }
4987
4988 /*
4989  * functions to set current state id
4990  */
4991 void
4992 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4993 {
4994         put_stateid(cstate, &odp->od_stateid);
4995 }
4996
4997 void
4998 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4999 {
5000         put_stateid(cstate, &open->op_stateid);
5001 }
5002
5003 void
5004 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5005 {
5006         put_stateid(cstate, &close->cl_stateid);
5007 }
5008
5009 void
5010 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5011 {
5012         put_stateid(cstate, &lock->lk_resp_stateid);
5013 }
5014
5015 /*
5016  * functions to consume current state id
5017  */
5018
5019 void
5020 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5021 {
5022         get_stateid(cstate, &odp->od_stateid);
5023 }
5024
5025 void
5026 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5027 {
5028         get_stateid(cstate, &drp->dr_stateid);
5029 }
5030
5031 void
5032 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5033 {
5034         get_stateid(cstate, &fsp->fr_stateid);
5035 }
5036
5037 void
5038 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5039 {
5040         get_stateid(cstate, &setattr->sa_stateid);
5041 }
5042
5043 void
5044 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5045 {
5046         get_stateid(cstate, &close->cl_stateid);
5047 }
5048
5049 void
5050 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5051 {
5052         get_stateid(cstate, &locku->lu_stateid);
5053 }
5054
5055 void
5056 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5057 {
5058         get_stateid(cstate, &read->rd_stateid);
5059 }
5060
5061 void
5062 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5063 {
5064         get_stateid(cstate, &write->wr_stateid);
5065 }