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 "xdr4cb.h"
  46 #include "vfs.h"
  47 #include "current_stateid.h"
  48
  49 #include "netns.h"
  50
  51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  52
  53 #define all_ones {{~0,~0},~0}
  54 static const stateid_t one_stateid = {
  55         .si_generation = ~0,
  56         .si_opaque = all_ones,
  57 };
  58 static const stateid_t zero_stateid = {
  59         /* all fields zero */
  60 };
  61 static const stateid_t currentstateid = {
  62         .si_generation = 1,
  63 };
  64
  65 static u64 current_sessionid = 1;
  66
  67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  68 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  69 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  70
  71 /* forward declarations */
  72 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  73
  74 /* Locking: */
  75
  76 /* Currently used for almost all code touching nfsv4 state: */
  77 static DEFINE_MUTEX(client_mutex);
  78
  79 /*
  80  * Currently used for the del_recall_lru and file hash table.  In an
  81  * effort to decrease the scope of the client_mutex, this spinlock may
  82  * eventually cover more:
  83  */
  84 static DEFINE_SPINLOCK(recall_lock);
  85
  86 static struct kmem_cache *openowner_slab = NULL;
  87 static struct kmem_cache *lockowner_slab = NULL;
  88 static struct kmem_cache *file_slab = NULL;
  89 static struct kmem_cache *stateid_slab = NULL;
  90 static struct kmem_cache *deleg_slab = NULL;
  91
  92 void
  93 nfs4_lock_state(void)
  94 {
  95         mutex_lock(&client_mutex);
  96 }
  97
  98 static void free_session(struct nfsd4_session *);
  99
 100 static bool is_session_dead(struct nfsd4_session *ses)
 101 {
 102         return ses->se_flags & NFS4_SESSION_DEAD;
 103 }
 104
 105 void nfsd4_put_session(struct nfsd4_session *ses)
 106 {
 107         if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
 108                 free_session(ses);
 109 }
 110
 111 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
 112 {
 113         if (atomic_read(&ses->se_ref) > ref_held_by_me)
 114                 return nfserr_jukebox;
 115         ses->se_flags |= NFS4_SESSION_DEAD;
 116         return nfs_ok;
 117 }
 118
 119 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
 120 {
 121         if (is_session_dead(ses))
 122                 return nfserr_badsession;
 123         atomic_inc(&ses->se_ref);
 124         return nfs_ok;
 125 }
 126
 127 void
 128 nfs4_unlock_state(void)
 129 {
 130         mutex_unlock(&client_mutex);
 131 }
 132
 133 static bool is_client_expired(struct nfs4_client *clp)
 134 {
 135         return clp->cl_time == 0;
 136 }
 137
 138 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
 139 {
 140         if (atomic_read(&clp->cl_refcount))
 141                 return nfserr_jukebox;
 142         clp->cl_time = 0;
 143         return nfs_ok;
 144 }
 145
 146 static __be32 mark_client_expired(struct nfs4_client *clp)
 147 {
 148         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 149         __be32 ret;
 150
 151         spin_lock(&nn->client_lock);
 152         ret = mark_client_expired_locked(clp);
 153         spin_unlock(&nn->client_lock);
 154         return ret;
 155 }
 156
 157 static __be32 get_client_locked(struct nfs4_client *clp)
 158 {
 159         if (is_client_expired(clp))
 160                 return nfserr_expired;
 161         atomic_inc(&clp->cl_refcount);
 162         return nfs_ok;
 163 }
 164
 165 /* must be called under the client_lock */
 166 static inline void
 167 renew_client_locked(struct nfs4_client *clp)
 168 {
 169         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 170
 171         if (is_client_expired(clp)) {
 172                 WARN_ON(1);
 173                 printk("%s: client (clientid %08x/%08x) already expired\n",
 174                         __func__,
 175                         clp->cl_clientid.cl_boot,
 176                         clp->cl_clientid.cl_id);
 177                 return;
 178         }
 179
 180         dprintk("renewing client (clientid %08x/%08x)\n",
 181                         clp->cl_clientid.cl_boot,
 182                         clp->cl_clientid.cl_id);
 183         list_move_tail(&clp->cl_lru, &nn->client_lru);
 184         clp->cl_time = get_seconds();
 185 }
 186
 187 static inline void
 188 renew_client(struct nfs4_client *clp)
 189 {
 190         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 191
 192         spin_lock(&nn->client_lock);
 193         renew_client_locked(clp);
 194         spin_unlock(&nn->client_lock);
 195 }
 196
 197 static void put_client_renew_locked(struct nfs4_client *clp)
 198 {
 199         if (!atomic_dec_and_test(&clp->cl_refcount))
 200                 return;
 201         if (!is_client_expired(clp))
 202                 renew_client_locked(clp);
 203 }
 204
 205 void put_client_renew(struct nfs4_client *clp)
 206 {
 207         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 208
 209         if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
 210                 return;
 211         if (!is_client_expired(clp))
 212                 renew_client_locked(clp);
 213         spin_unlock(&nn->client_lock);
 214 }
 215
 216
 217 static inline u32
 218 opaque_hashval(const void *ptr, int nbytes)
 219 {
 220         unsigned char *cptr = (unsigned char *) ptr;
 221
 222         u32 x = 0;
 223         while (nbytes--) {
 224                 x *= 37;
 225                 x += *cptr++;
 226         }
 227         return x;
 228 }
 229
 230 static void nfsd4_free_file(struct nfs4_file *f)
 231 {
 232         kmem_cache_free(file_slab, f);
 233 }
 234
 235 static inline void
 236 put_nfs4_file(struct nfs4_file *fi)
 237 {
 238         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
 239                 hlist_del(&fi->fi_hash);
 240                 spin_unlock(&recall_lock);
 241                 iput(fi->fi_inode);
 242                 nfsd4_free_file(fi);
 243         }
 244 }
 245
 246 static inline void
 247 get_nfs4_file(struct nfs4_file *fi)
 248 {
 249         atomic_inc(&fi->fi_ref);
 250 }
 251
 252 static int num_delegations;
 253 unsigned long max_delegations;
 254
 255 /*
 256  * Open owner state (share locks)
 257  */
 258
 259 /* hash tables for lock and open owners */
 260 #define OWNER_HASH_BITS              8
 261 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 262 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 263
 264 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 265 {
 266         unsigned int ret;
 267
 268         ret = opaque_hashval(ownername->data, ownername->len);
 269         ret += clientid;
 270         return ret & OWNER_HASH_MASK;
 271 }
 272
 273 /* hash table for nfs4_file */
 274 #define FILE_HASH_BITS                   8
 275 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 276
 277 static unsigned int file_hashval(struct inode *ino)
 278 {
 279         /* XXX: why are we hashing on inode pointer, anyway? */
 280         return hash_ptr(ino, FILE_HASH_BITS);
 281 }
 282
 283 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
 284
 285 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 286 {
 287         WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 288         atomic_inc(&fp->fi_access[oflag]);
 289 }
 290
 291 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 292 {
 293         if (oflag == O_RDWR) {
 294                 __nfs4_file_get_access(fp, O_RDONLY);
 295                 __nfs4_file_get_access(fp, O_WRONLY);
 296         } else
 297                 __nfs4_file_get_access(fp, oflag);
 298 }
 299
 300 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 301 {
 302         if (fp->fi_fds[oflag]) {
 303                 fput(fp->fi_fds[oflag]);
 304                 fp->fi_fds[oflag] = NULL;
 305         }
 306 }
 307
 308 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 309 {
 310         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 311                 nfs4_file_put_fd(fp, oflag);
 312                 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
 313                         nfs4_file_put_fd(fp, O_RDWR);
 314         }
 315 }
 316
 317 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 318 {
 319         if (oflag == O_RDWR) {
 320                 __nfs4_file_put_access(fp, O_RDONLY);
 321                 __nfs4_file_put_access(fp, O_WRONLY);
 322         } else
 323                 __nfs4_file_put_access(fp, oflag);
 324 }
 325
 326 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
 327 kmem_cache *slab)
 328 {
 329         struct idr *stateids = &cl->cl_stateids;
 330         struct nfs4_stid *stid;
 331         int new_id;
 332
 333         stid = kmem_cache_alloc(slab, GFP_KERNEL);
 334         if (!stid)
 335                 return NULL;
 336
 337         new_id = idr_alloc_cyclic(stateids, stid, 0, 0, GFP_KERNEL);
 338         if (new_id < 0)
 339                 goto out_free;
 340         stid->sc_client = cl;
 341         stid->sc_type = 0;
 342         stid->sc_stateid.si_opaque.so_id = new_id;
 343         stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
 344         /* Will be incremented before return to client: */
 345         stid->sc_stateid.si_generation = 0;
 346
 347         /*
 348          * It shouldn't be a problem to reuse an opaque stateid value.
 349          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 350          * example, a stray write retransmission could be accepted by
 351          * the server when it should have been rejected.  Therefore,
 352          * adopt a trick from the sctp code to attempt to maximize the
 353          * amount of time until an id is reused, by ensuring they always
 354          * "increase" (mod INT_MAX):
 355          */
 356         return stid;
 357 out_free:
 358         kmem_cache_free(slab, stid);
 359         return NULL;
 360 }
 361
 362 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 363 {
 364         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 365 }
 366
 367 static struct nfs4_delegation *
 368 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
 369 {
 370         struct nfs4_delegation *dp;
 371
 372         dprintk("NFSD alloc_init_deleg\n");
 373         if (num_delegations > max_delegations)
 374                 return NULL;
 375         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 376         if (dp == NULL)
 377                 return dp;
 378         dp->dl_stid.sc_type = NFS4_DELEG_STID;
 379         /*
 380          * delegation seqid's are never incremented.  The 4.1 special
 381          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 382          * 0 anyway just for consistency and use 1:
 383          */
 384         dp->dl_stid.sc_stateid.si_generation = 1;
 385         num_delegations++;
 386         INIT_LIST_HEAD(&dp->dl_perfile);
 387         INIT_LIST_HEAD(&dp->dl_perclnt);
 388         INIT_LIST_HEAD(&dp->dl_recall_lru);
 389         dp->dl_file = NULL;
 390         dp->dl_type = NFS4_OPEN_DELEGATE_READ;
 391         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 392         dp->dl_time = 0;
 393         atomic_set(&dp->dl_count, 1);
 394         nfsd4_init_callback(&dp->dl_recall);
 395         return dp;
 396 }
 397
 398 static void remove_stid(struct nfs4_stid *s)
 399 {
 400         struct idr *stateids = &s->sc_client->cl_stateids;
 401
 402         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 403 }
 404
 405 static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
 406 {
 407         kmem_cache_free(slab, s);
 408 }
 409
 410 void
 411 nfs4_put_delegation(struct nfs4_delegation *dp)
 412 {
 413         if (atomic_dec_and_test(&dp->dl_count)) {
 414                 nfs4_free_stid(deleg_slab, &dp->dl_stid);
 415                 num_delegations--;
 416         }
 417 }
 418
 419 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 420 {
 421         if (atomic_dec_and_test(&fp->fi_delegees)) {
 422                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 423                 fp->fi_lease = NULL;
 424                 fput(fp->fi_deleg_file);
 425                 fp->fi_deleg_file = NULL;
 426         }
 427 }
 428
 429 static void unhash_stid(struct nfs4_stid *s)
 430 {
 431         s->sc_type = 0;
 432 }
 433
 434 /* Called under the state lock. */
 435 static void
 436 unhash_delegation(struct nfs4_delegation *dp)
 437 {
 438         list_del_init(&dp->dl_perclnt);
 439         spin_lock(&recall_lock);
 440         list_del_init(&dp->dl_perfile);
 441         list_del_init(&dp->dl_recall_lru);
 442         spin_unlock(&recall_lock);
 443         nfs4_put_deleg_lease(dp->dl_file);
 444         put_nfs4_file(dp->dl_file);
 445         dp->dl_file = NULL;
 446 }
 447
 448
 449
 450 static void destroy_revoked_delegation(struct nfs4_delegation *dp)
 451 {
 452         list_del_init(&dp->dl_recall_lru);
 453         remove_stid(&dp->dl_stid);
 454         nfs4_put_delegation(dp);
 455 }
 456
 457 static void destroy_delegation(struct nfs4_delegation *dp)
 458 {
 459         unhash_delegation(dp);
 460         remove_stid(&dp->dl_stid);
 461         nfs4_put_delegation(dp);
 462 }
 463
 464 static void revoke_delegation(struct nfs4_delegation *dp)
 465 {
 466         struct nfs4_client *clp = dp->dl_stid.sc_client;
 467
 468         if (clp->cl_minorversion == 0)
 469                 destroy_delegation(dp);
 470         else {
 471                 unhash_delegation(dp);
 472                 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
 473                 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
 474         }
 475 }
 476
 477 /*
 478  * SETCLIENTID state
 479  */
 480
 481 static unsigned int clientid_hashval(u32 id)
 482 {
 483         return id & CLIENT_HASH_MASK;
 484 }
 485
 486 static unsigned int clientstr_hashval(const char *name)
 487 {
 488         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 489 }
 490
 491 /*
 492  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 493  * st_{access,deny}_bmap field of the stateid, in order to track not
 494  * only what share bits are currently in force, but also what
 495  * combinations of share bits previous opens have used.  This allows us
 496  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 497  * return an error if the client attempt to downgrade to a combination
 498  * of share bits not explicable by closing some of its previous opens.
 499  *
 500  * XXX: This enforcement is actually incomplete, since we don't keep
 501  * track of access/deny bit combinations; so, e.g., we allow:
 502  *
 503  *      OPEN allow read, deny write
 504  *      OPEN allow both, deny none
 505  *      DOWNGRADE allow read, deny none
 506  *
 507  * which we should reject.
 508  */
 509 static unsigned int
 510 bmap_to_share_mode(unsigned long bmap) {
 511         int i;
 512         unsigned int access = 0;
 513
 514         for (i = 1; i < 4; i++) {
 515                 if (test_bit(i, &bmap))
 516                         access |= i;
 517         }
 518         return access;
 519 }
 520
 521 static bool
 522 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 523         unsigned int access, deny;
 524
 525         access = bmap_to_share_mode(stp->st_access_bmap);
 526         deny = bmap_to_share_mode(stp->st_deny_bmap);
 527         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 528                 return false;
 529         return true;
 530 }
 531
 532 /* set share access for a given stateid */
 533 static inline void
 534 set_access(u32 access, struct nfs4_ol_stateid *stp)
 535 {
 536         __set_bit(access, &stp->st_access_bmap);
 537 }
 538
 539 /* clear share access for a given stateid */
 540 static inline void
 541 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 542 {
 543         __clear_bit(access, &stp->st_access_bmap);
 544 }
 545
 546 /* test whether a given stateid has access */
 547 static inline bool
 548 test_access(u32 access, struct nfs4_ol_stateid *stp)
 549 {
 550         return test_bit(access, &stp->st_access_bmap);
 551 }
 552
 553 /* set share deny for a given stateid */
 554 static inline void
 555 set_deny(u32 access, struct nfs4_ol_stateid *stp)
 556 {
 557         __set_bit(access, &stp->st_deny_bmap);
 558 }
 559
 560 /* clear share deny for a given stateid */
 561 static inline void
 562 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 563 {
 564         __clear_bit(access, &stp->st_deny_bmap);
 565 }
 566
 567 /* test whether a given stateid is denying specific access */
 568 static inline bool
 569 test_deny(u32 access, struct nfs4_ol_stateid *stp)
 570 {
 571         return test_bit(access, &stp->st_deny_bmap);
 572 }
 573
 574 static int nfs4_access_to_omode(u32 access)
 575 {
 576         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 577         case NFS4_SHARE_ACCESS_READ:
 578                 return O_RDONLY;
 579         case NFS4_SHARE_ACCESS_WRITE:
 580                 return O_WRONLY;
 581         case NFS4_SHARE_ACCESS_BOTH:
 582                 return O_RDWR;
 583         }
 584         WARN_ON_ONCE(1);
 585         return O_RDONLY;
 586 }
 587
 588 /* release all access and file references for a given stateid */
 589 static void
 590 release_all_access(struct nfs4_ol_stateid *stp)
 591 {
 592         int i;
 593
 594         for (i = 1; i < 4; i++) {
 595                 if (test_access(i, stp))
 596                         nfs4_file_put_access(stp->st_file,
 597                                              nfs4_access_to_omode(i));
 598                 clear_access(i, stp);
 599         }
 600 }
 601
 602 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 603 {
 604         list_del(&stp->st_perfile);
 605         list_del(&stp->st_perstateowner);
 606 }
 607
 608 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 609 {
 610         release_all_access(stp);
 611         put_nfs4_file(stp->st_file);
 612         stp->st_file = NULL;
 613 }
 614
 615 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 616 {
 617         remove_stid(&stp->st_stid);
 618         nfs4_free_stid(stateid_slab, &stp->st_stid);
 619 }
 620
 621 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 622 {
 623         struct file *file;
 624
 625         unhash_generic_stateid(stp);
 626         unhash_stid(&stp->st_stid);
 627         file = find_any_file(stp->st_file);
 628         if (file)
 629                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 630         close_generic_stateid(stp);
 631         free_generic_stateid(stp);
 632 }
 633
 634 static void unhash_lockowner(struct nfs4_lockowner *lo)
 635 {
 636         struct nfs4_ol_stateid *stp;
 637
 638         list_del(&lo->lo_owner.so_strhash);
 639         list_del(&lo->lo_perstateid);
 640         list_del(&lo->lo_owner_ino_hash);
 641         while (!list_empty(&lo->lo_owner.so_stateids)) {
 642                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 643                                 struct nfs4_ol_stateid, st_perstateowner);
 644                 release_lock_stateid(stp);
 645         }
 646 }
 647
 648 static void release_lockowner(struct nfs4_lockowner *lo)
 649 {
 650         unhash_lockowner(lo);
 651         nfs4_free_lockowner(lo);
 652 }
 653
 654 static void
 655 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 656 {
 657         struct nfs4_lockowner *lo;
 658
 659         while (!list_empty(&open_stp->st_lockowners)) {
 660                 lo = list_entry(open_stp->st_lockowners.next,
 661                                 struct nfs4_lockowner, lo_perstateid);
 662                 release_lockowner(lo);
 663         }
 664 }
 665
 666 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 667 {
 668         unhash_generic_stateid(stp);
 669         release_stateid_lockowners(stp);
 670         close_generic_stateid(stp);
 671 }
 672
 673 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 674 {
 675         unhash_open_stateid(stp);
 676         free_generic_stateid(stp);
 677 }
 678
 679 static void unhash_openowner(struct nfs4_openowner *oo)
 680 {
 681         struct nfs4_ol_stateid *stp;
 682
 683         list_del(&oo->oo_owner.so_strhash);
 684         list_del(&oo->oo_perclient);
 685         while (!list_empty(&oo->oo_owner.so_stateids)) {
 686                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 687                                 struct nfs4_ol_stateid, st_perstateowner);
 688                 release_open_stateid(stp);
 689         }
 690 }
 691
 692 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 693 {
 694         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 695
 696         if (s) {
 697                 free_generic_stateid(s);
 698                 oo->oo_last_closed_stid = NULL;
 699         }
 700 }
 701
 702 static void release_openowner(struct nfs4_openowner *oo)
 703 {
 704         unhash_openowner(oo);
 705         list_del(&oo->oo_close_lru);
 706         release_last_closed_stateid(oo);
 707         nfs4_free_openowner(oo);
 708 }
 709
 710 static inline int
 711 hash_sessionid(struct nfs4_sessionid *sessionid)
 712 {
 713         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 714
 715         return sid->sequence % SESSION_HASH_SIZE;
 716 }
 717
 718 #ifdef NFSD_DEBUG
 719 static inline void
 720 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 721 {
 722         u32 *ptr = (u32 *)(&sessionid->data[0]);
 723         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 724 }
 725 #else
 726 static inline void
 727 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 728 {
 729 }
 730 #endif
 731
 732 /*
 733  * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
 734  * won't be used for replay.
 735  */
 736 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
 737 {
 738         struct nfs4_stateowner *so = cstate->replay_owner;
 739
 740         if (nfserr == nfserr_replay_me)
 741                 return;
 742
 743         if (!seqid_mutating_err(ntohl(nfserr))) {
 744                 cstate->replay_owner = NULL;
 745                 return;
 746         }
 747         if (!so)
 748                 return;
 749         if (so->so_is_open_owner)
 750                 release_last_closed_stateid(openowner(so));
 751         so->so_seqid++;
 752         return;
 753 }
 754
 755 static void
 756 gen_sessionid(struct nfsd4_session *ses)
 757 {
 758         struct nfs4_client *clp = ses->se_client;
 759         struct nfsd4_sessionid *sid;
 760
 761         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 762         sid->clientid = clp->cl_clientid;
 763         sid->sequence = current_sessionid++;
 764         sid->reserved = 0;
 765 }
 766
 767 /*
 768  * The protocol defines ca_maxresponssize_cached to include the size of
 769  * the rpc header, but all we need to cache is the data starting after
 770  * the end of the initial SEQUENCE operation--the rest we regenerate
 771  * each time.  Therefore we can advertise a ca_maxresponssize_cached
 772  * value that is the number of bytes in our cache plus a few additional
 773  * bytes.  In order to stay on the safe side, and not promise more than
 774  * we can cache, those additional bytes must be the minimum possible: 24
 775  * bytes of rpc header (xid through accept state, with AUTH_NULL
 776  * verifier), 12 for the compound header (with zero-length tag), and 44
 777  * for the SEQUENCE op response:
 778  */
 779 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 780
 781 static void
 782 free_session_slots(struct nfsd4_session *ses)
 783 {
 784         int i;
 785
 786         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 787                 kfree(ses->se_slots[i]);
 788 }
 789
 790 /*
 791  * We don't actually need to cache the rpc and session headers, so we
 792  * can allocate a little less for each slot:
 793  */
 794 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
 795 {
 796         u32 size;
 797
 798         if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
 799                 size = 0;
 800         else
 801                 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 802         return size + sizeof(struct nfsd4_slot);
 803 }
 804
 805 /*
 806  * XXX: If we run out of reserved DRC memory we could (up to a point)
 807  * re-negotiate active sessions and reduce their slot usage to make
 808  * room for new connections. For now we just fail the create session.
 809  */
 810 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
 811 {
 812         u32 slotsize = slot_bytes(ca);
 813         u32 num = ca->maxreqs;
 814         int avail;
 815
 816         spin_lock(&nfsd_drc_lock);
 817         avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
 818                     nfsd_drc_max_mem - nfsd_drc_mem_used);
 819         num = min_t(int, num, avail / slotsize);
 820         nfsd_drc_mem_used += num * slotsize;
 821         spin_unlock(&nfsd_drc_lock);
 822
 823         return num;
 824 }
 825
 826 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
 827 {
 828         int slotsize = slot_bytes(ca);
 829
 830         spin_lock(&nfsd_drc_lock);
 831         nfsd_drc_mem_used -= slotsize * ca->maxreqs;
 832         spin_unlock(&nfsd_drc_lock);
 833 }
 834
 835 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
 836                                            struct nfsd4_channel_attrs *battrs)
 837 {
 838         int numslots = fattrs->maxreqs;
 839         int slotsize = slot_bytes(fattrs);
 840         struct nfsd4_session *new;
 841         int mem, i;
 842
 843         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 844                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
 845         mem = numslots * sizeof(struct nfsd4_slot *);
 846
 847         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 848         if (!new)
 849                 return NULL;
 850         /* allocate each struct nfsd4_slot and data cache in one piece */
 851         for (i = 0; i < numslots; i++) {
 852                 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
 853                 if (!new->se_slots[i])
 854                         goto out_free;
 855         }
 856
 857         memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
 858         memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
 859
 860         return new;
 861 out_free:
 862         while (i--)
 863                 kfree(new->se_slots[i]);
 864         kfree(new);
 865         return NULL;
 866 }
 867
 868 static void free_conn(struct nfsd4_conn *c)
 869 {
 870         svc_xprt_put(c->cn_xprt);
 871         kfree(c);
 872 }
 873
 874 static void nfsd4_conn_lost(struct svc_xpt_user *u)
 875 {
 876         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 877         struct nfs4_client *clp = c->cn_session->se_client;
 878
 879         spin_lock(&clp->cl_lock);
 880         if (!list_empty(&c->cn_persession)) {
 881                 list_del(&c->cn_persession);
 882                 free_conn(c);
 883         }
 884         nfsd4_probe_callback(clp);
 885         spin_unlock(&clp->cl_lock);
 886 }
 887
 888 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 889 {
 890         struct nfsd4_conn *conn;
 891
 892         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 893         if (!conn)
 894                 return NULL;
 895         svc_xprt_get(rqstp->rq_xprt);
 896         conn->cn_xprt = rqstp->rq_xprt;
 897         conn->cn_flags = flags;
 898         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
 899         return conn;
 900 }
 901
 902 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 903 {
 904         conn->cn_session = ses;
 905         list_add(&conn->cn_persession, &ses->se_conns);
 906 }
 907
 908 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 909 {
 910         struct nfs4_client *clp = ses->se_client;
 911
 912         spin_lock(&clp->cl_lock);
 913         __nfsd4_hash_conn(conn, ses);
 914         spin_unlock(&clp->cl_lock);
 915 }
 916
 917 static int nfsd4_register_conn(struct nfsd4_conn *conn)
 918 {
 919         conn->cn_xpt_user.callback = nfsd4_conn_lost;
 920         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
 921 }
 922
 923 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
 924 {
 925         int ret;
 926
 927         nfsd4_hash_conn(conn, ses);
 928         ret = nfsd4_register_conn(conn);
 929         if (ret)
 930                 /* oops; xprt is already down: */
 931                 nfsd4_conn_lost(&conn->cn_xpt_user);
 932         if (conn->cn_flags & NFS4_CDFC4_BACK) {
 933                 /* callback channel may be back up */
 934                 nfsd4_probe_callback(ses->se_client);
 935         }
 936 }
 937
 938 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
 939 {
 940         u32 dir = NFS4_CDFC4_FORE;
 941
 942         if (cses->flags & SESSION4_BACK_CHAN)
 943                 dir |= NFS4_CDFC4_BACK;
 944         return alloc_conn(rqstp, dir);
 945 }
 946
 947 /* must be called under client_lock */
 948 static void nfsd4_del_conns(struct nfsd4_session *s)
 949 {
 950         struct nfs4_client *clp = s->se_client;
 951         struct nfsd4_conn *c;
 952
 953         spin_lock(&clp->cl_lock);
 954         while (!list_empty(&s->se_conns)) {
 955                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
 956                 list_del_init(&c->cn_persession);
 957                 spin_unlock(&clp->cl_lock);
 958
 959                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
 960                 free_conn(c);
 961
 962                 spin_lock(&clp->cl_lock);
 963         }
 964         spin_unlock(&clp->cl_lock);
 965 }
 966
 967 static void __free_session(struct nfsd4_session *ses)
 968 {
 969         free_session_slots(ses);
 970         kfree(ses);
 971 }
 972
 973 static void free_session(struct nfsd4_session *ses)
 974 {
 975         struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
 976
 977         lockdep_assert_held(&nn->client_lock);
 978         nfsd4_del_conns(ses);
 979         nfsd4_put_drc_mem(&ses->se_fchannel);
 980         __free_session(ses);
 981 }
 982
 983 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 984 {
 985         int idx;
 986         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 987
 988         new->se_client = clp;
 989         gen_sessionid(new);
 990
 991         INIT_LIST_HEAD(&new->se_conns);
 992
 993         new->se_cb_seq_nr = 1;
 994         new->se_flags = cses->flags;
 995         new->se_cb_prog = cses->callback_prog;
 996         new->se_cb_sec = cses->cb_sec;
 997         atomic_set(&new->se_ref, 0);
 998         idx = hash_sessionid(&new->se_sessionid);
 999         spin_lock(&nn->client_lock);
1000         list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1001         spin_lock(&clp->cl_lock);
1002         list_add(&new->se_perclnt, &clp->cl_sessions);
1003         spin_unlock(&clp->cl_lock);
1004         spin_unlock(&nn->client_lock);
1005
1006         if (cses->flags & SESSION4_BACK_CHAN) {
1007                 struct sockaddr *sa = svc_addr(rqstp);
1008                 /*
1009                  * This is a little silly; with sessions there's no real
1010                  * use for the callback address.  Use the peer address
1011                  * as a reasonable default for now, but consider fixing
1012                  * the rpc client not to require an address in the
1013                  * future:
1014                  */
1015                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1016                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1017         }
1018 }
1019
1020 /* caller must hold client_lock */
1021 static struct nfsd4_session *
1022 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1023 {
1024         struct nfsd4_session *elem;
1025         int idx;
1026         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1027
1028         dump_sessionid(__func__, sessionid);
1029         idx = hash_sessionid(sessionid);
1030         /* Search in the appropriate list */
1031         list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1032                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1033                             NFS4_MAX_SESSIONID_LEN)) {
1034                         return elem;
1035                 }
1036         }
1037
1038         dprintk("%s: session not found\n", __func__);
1039         return NULL;
1040 }
1041
1042 /* caller must hold client_lock */
1043 static void
1044 unhash_session(struct nfsd4_session *ses)
1045 {
1046         list_del(&ses->se_hash);
1047         spin_lock(&ses->se_client->cl_lock);
1048         list_del(&ses->se_perclnt);
1049         spin_unlock(&ses->se_client->cl_lock);
1050 }
1051
1052 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1053 static int
1054 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1055 {
1056         if (clid->cl_boot == nn->boot_time)
1057                 return 0;
1058         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1059                 clid->cl_boot, clid->cl_id, nn->boot_time);
1060         return 1;
1061 }
1062
1063 /*
1064  * XXX Should we use a slab cache ?
1065  * This type of memory management is somewhat inefficient, but we use it
1066  * anyway since SETCLIENTID is not a common operation.
1067  */
1068 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1069 {
1070         struct nfs4_client *clp;
1071
1072         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1073         if (clp == NULL)
1074                 return NULL;
1075         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1076         if (clp->cl_name.data == NULL) {
1077                 kfree(clp);
1078                 return NULL;
1079         }
1080         clp->cl_name.len = name.len;
1081         INIT_LIST_HEAD(&clp->cl_sessions);
1082         idr_init(&clp->cl_stateids);
1083         atomic_set(&clp->cl_refcount, 0);
1084         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1085         INIT_LIST_HEAD(&clp->cl_idhash);
1086         INIT_LIST_HEAD(&clp->cl_openowners);
1087         INIT_LIST_HEAD(&clp->cl_delegations);
1088         INIT_LIST_HEAD(&clp->cl_lru);
1089         INIT_LIST_HEAD(&clp->cl_callbacks);
1090         INIT_LIST_HEAD(&clp->cl_revoked);
1091         spin_lock_init(&clp->cl_lock);
1092         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1093         return clp;
1094 }
1095
1096 static inline void
1097 free_client(struct nfs4_client *clp)
1098 {
1099         struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
1100
1101         lockdep_assert_held(&nn->client_lock);
1102         while (!list_empty(&clp->cl_sessions)) {
1103                 struct nfsd4_session *ses;
1104                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1105                                 se_perclnt);
1106                 list_del(&ses->se_perclnt);
1107                 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1108                 free_session(ses);
1109         }
1110         rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1111         free_svc_cred(&clp->cl_cred);
1112         kfree(clp->cl_name.data);
1113         idr_destroy(&clp->cl_stateids);
1114         kfree(clp);
1115 }
1116
1117 /* must be called under the client_lock */
1118 static inline void
1119 unhash_client_locked(struct nfs4_client *clp)
1120 {
1121         struct nfsd4_session *ses;
1122
1123         list_del(&clp->cl_lru);
1124         spin_lock(&clp->cl_lock);
1125         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1126                 list_del_init(&ses->se_hash);
1127         spin_unlock(&clp->cl_lock);
1128 }
1129
1130 static void
1131 destroy_client(struct nfs4_client *clp)
1132 {
1133         struct nfs4_openowner *oo;
1134         struct nfs4_delegation *dp;
1135         struct list_head reaplist;
1136         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1137
1138         INIT_LIST_HEAD(&reaplist);
1139         spin_lock(&recall_lock);
1140         while (!list_empty(&clp->cl_delegations)) {
1141                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1142                 list_del_init(&dp->dl_perclnt);
1143                 list_move(&dp->dl_recall_lru, &reaplist);
1144         }
1145         spin_unlock(&recall_lock);
1146         while (!list_empty(&reaplist)) {
1147                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1148                 destroy_delegation(dp);
1149         }
1150         list_splice_init(&clp->cl_revoked, &reaplist);
1151         while (!list_empty(&reaplist)) {
1152                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1153                 destroy_revoked_delegation(dp);
1154         }
1155         while (!list_empty(&clp->cl_openowners)) {
1156                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1157                 release_openowner(oo);
1158         }
1159         nfsd4_shutdown_callback(clp);
1160         if (clp->cl_cb_conn.cb_xprt)
1161                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1162         list_del(&clp->cl_idhash);
1163         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1164                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1165         else
1166                 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1167         spin_lock(&nn->client_lock);
1168         unhash_client_locked(clp);
1169         WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
1170         free_client(clp);
1171         spin_unlock(&nn->client_lock);
1172 }
1173
1174 static void expire_client(struct nfs4_client *clp)
1175 {
1176         nfsd4_client_record_remove(clp);
1177         destroy_client(clp);
1178 }
1179
1180 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1181 {
1182         memcpy(target->cl_verifier.data, source->data,
1183                         sizeof(target->cl_verifier.data));
1184 }
1185
1186 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1187 {
1188         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1189         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1190 }
1191
1192 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1193 {
1194         if (source->cr_principal) {
1195                 target->cr_principal =
1196                                 kstrdup(source->cr_principal, GFP_KERNEL);
1197                 if (target->cr_principal == NULL)
1198                         return -ENOMEM;
1199         } else
1200                 target->cr_principal = NULL;
1201         target->cr_flavor = source->cr_flavor;
1202         target->cr_uid = source->cr_uid;
1203         target->cr_gid = source->cr_gid;
1204         target->cr_group_info = source->cr_group_info;
1205         get_group_info(target->cr_group_info);
1206         target->cr_gss_mech = source->cr_gss_mech;
1207         if (source->cr_gss_mech)
1208                 gss_mech_get(source->cr_gss_mech);
1209         return 0;
1210 }
1211
1212 static long long
1213 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1214 {
1215         long long res;
1216
1217         res = o1->len - o2->len;
1218         if (res)
1219                 return res;
1220         return (long long)memcmp(o1->data, o2->data, o1->len);
1221 }
1222
1223 static int same_name(const char *n1, const char *n2)
1224 {
1225         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1226 }
1227
1228 static int
1229 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1230 {
1231         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1232 }
1233
1234 static int
1235 same_clid(clientid_t *cl1, clientid_t *cl2)
1236 {
1237         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1238 }
1239
1240 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1241 {
1242         int i;
1243
1244         if (g1->ngroups != g2->ngroups)
1245                 return false;
1246         for (i=0; i<g1->ngroups; i++)
1247                 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1248                         return false;
1249         return true;
1250 }
1251
1252 /*
1253  * RFC 3530 language requires clid_inuse be returned when the
1254  * "principal" associated with a requests differs from that previously
1255  * used.  We use uid, gid's, and gss principal string as our best
1256  * approximation.  We also don't want to allow non-gss use of a client
1257  * established using gss: in theory cr_principal should catch that
1258  * change, but in practice cr_principal can be null even in the gss case
1259  * since gssd doesn't always pass down a principal string.
1260  */
1261 static bool is_gss_cred(struct svc_cred *cr)
1262 {
1263         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1264         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1265 }
1266
1267
1268 static bool
1269 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1270 {
1271         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1272                 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1273                 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1274                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1275                 return false;
1276         if (cr1->cr_principal == cr2->cr_principal)
1277                 return true;
1278         if (!cr1->cr_principal || !cr2->cr_principal)
1279                 return false;
1280         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1281 }
1282
1283 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1284 {
1285         struct svc_cred *cr = &rqstp->rq_cred;
1286         u32 service;
1287
1288         if (!cr->cr_gss_mech)
1289                 return false;
1290         service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1291         return service == RPC_GSS_SVC_INTEGRITY ||
1292                service == RPC_GSS_SVC_PRIVACY;
1293 }
1294
1295 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1296 {
1297         struct svc_cred *cr = &rqstp->rq_cred;
1298
1299         if (!cl->cl_mach_cred)
1300                 return true;
1301         if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1302                 return false;
1303         if (!svc_rqst_integrity_protected(rqstp))
1304                 return false;
1305         if (!cr->cr_principal)
1306                 return false;
1307         return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1308 }
1309
1310 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1311 {
1312         static u32 current_clientid = 1;
1313
1314         clp->cl_clientid.cl_boot = nn->boot_time;
1315         clp->cl_clientid.cl_id = current_clientid++;
1316 }
1317
1318 static void gen_confirm(struct nfs4_client *clp)
1319 {
1320         __be32 verf[2];
1321         static u32 i;
1322
1323         verf[0] = (__be32)get_seconds();
1324         verf[1] = (__be32)i++;
1325         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1326 }
1327
1328 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1329 {
1330         struct nfs4_stid *ret;
1331
1332         ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1333         if (!ret || !ret->sc_type)
1334                 return NULL;
1335         return ret;
1336 }
1337
1338 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1339 {
1340         struct nfs4_stid *s;
1341
1342         s = find_stateid(cl, t);
1343         if (!s)
1344                 return NULL;
1345         if (typemask & s->sc_type)
1346                 return s;
1347         return NULL;
1348 }
1349
1350 static struct nfs4_client *create_client(struct xdr_netobj name,
1351                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1352 {
1353         struct nfs4_client *clp;
1354         struct sockaddr *sa = svc_addr(rqstp);
1355         int ret;
1356         struct net *net = SVC_NET(rqstp);
1357         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1358
1359         clp = alloc_client(name);
1360         if (clp == NULL)
1361                 return NULL;
1362
1363         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1364         if (ret) {
1365                 spin_lock(&nn->client_lock);
1366                 free_client(clp);
1367                 spin_unlock(&nn->client_lock);
1368                 return NULL;
1369         }
1370         nfsd4_init_callback(&clp->cl_cb_null);
1371         clp->cl_time = get_seconds();
1372         clear_bit(0, &clp->cl_cb_slot_busy);
1373         copy_verf(clp, verf);
1374         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1375         gen_confirm(clp);
1376         clp->cl_cb_session = NULL;
1377         clp->net = net;
1378         return clp;
1379 }
1380
1381 static void
1382 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1383 {
1384         struct rb_node **new = &(root->rb_node), *parent = NULL;
1385         struct nfs4_client *clp;
1386
1387         while (*new) {
1388                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1389                 parent = *new;
1390
1391                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1392                         new = &((*new)->rb_left);
1393                 else
1394                         new = &((*new)->rb_right);
1395         }
1396
1397         rb_link_node(&new_clp->cl_namenode, parent, new);
1398         rb_insert_color(&new_clp->cl_namenode, root);
1399 }
1400
1401 static struct nfs4_client *
1402 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1403 {
1404         long long cmp;
1405         struct rb_node *node = root->rb_node;
1406         struct nfs4_client *clp;
1407
1408         while (node) {
1409                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1410                 cmp = compare_blob(&clp->cl_name, name);
1411                 if (cmp > 0)
1412                         node = node->rb_left;
1413                 else if (cmp < 0)
1414                         node = node->rb_right;
1415                 else
1416                         return clp;
1417         }
1418         return NULL;
1419 }
1420
1421 static void
1422 add_to_unconfirmed(struct nfs4_client *clp)
1423 {
1424         unsigned int idhashval;
1425         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1426
1427         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1428         add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1429         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1430         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1431         renew_client(clp);
1432 }
1433
1434 static void
1435 move_to_confirmed(struct nfs4_client *clp)
1436 {
1437         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1438         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1439
1440         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1441         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1442         rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1443         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1444         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1445         renew_client(clp);
1446 }
1447
1448 static struct nfs4_client *
1449 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1450 {
1451         struct nfs4_client *clp;
1452         unsigned int idhashval = clientid_hashval(clid->cl_id);
1453
1454         list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1455                 if (same_clid(&clp->cl_clientid, clid)) {
1456                         if ((bool)clp->cl_minorversion != sessions)
1457                                 return NULL;
1458                         renew_client(clp);
1459                         return clp;
1460                 }
1461         }
1462         return NULL;
1463 }
1464
1465 static struct nfs4_client *
1466 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1467 {
1468         struct list_head *tbl = nn->conf_id_hashtbl;
1469
1470         return find_client_in_id_table(tbl, clid, sessions);
1471 }
1472
1473 static struct nfs4_client *
1474 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1475 {
1476         struct list_head *tbl = nn->unconf_id_hashtbl;
1477
1478         return find_client_in_id_table(tbl, clid, sessions);
1479 }
1480
1481 static bool clp_used_exchangeid(struct nfs4_client *clp)
1482 {
1483         return clp->cl_exchange_flags != 0;
1484 }
1485
1486 static struct nfs4_client *
1487 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1488 {
1489         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1490 }
1491
1492 static struct nfs4_client *
1493 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1494 {
1495         return find_clp_in_name_tree(name, &nn->unconf_name_tree);
1496 }
1497
1498 static void
1499 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1500 {
1501         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1502         struct sockaddr *sa = svc_addr(rqstp);
1503         u32 scopeid = rpc_get_scope_id(sa);
1504         unsigned short expected_family;
1505
1506         /* Currently, we only support tcp and tcp6 for the callback channel */
1507         if (se->se_callback_netid_len == 3 &&
1508             !memcmp(se->se_callback_netid_val, "tcp", 3))
1509                 expected_family = AF_INET;
1510         else if (se->se_callback_netid_len == 4 &&
1511                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1512                 expected_family = AF_INET6;
1513         else
1514                 goto out_err;
1515
1516         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1517                                             se->se_callback_addr_len,
1518                                             (struct sockaddr *)&conn->cb_addr,
1519                                             sizeof(conn->cb_addr));
1520
1521         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1522                 goto out_err;
1523
1524         if (conn->cb_addr.ss_family == AF_INET6)
1525                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1526
1527         conn->cb_prog = se->se_callback_prog;
1528         conn->cb_ident = se->se_callback_ident;
1529         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1530         return;
1531 out_err:
1532         conn->cb_addr.ss_family = AF_UNSPEC;
1533         conn->cb_addrlen = 0;
1534         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1535                 "will not receive delegations\n",
1536                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1537
1538         return;
1539 }
1540
1541 /*
1542  * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
1543  */
1544 void
1545 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1546 {
1547         struct nfsd4_slot *slot = resp->cstate.slot;
1548         unsigned int base;
1549
1550         dprintk("--> %s slot %p\n", __func__, slot);
1551
1552         slot->sl_opcnt = resp->opcnt;
1553         slot->sl_status = resp->cstate.status;
1554
1555         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1556         if (nfsd4_not_cached(resp)) {
1557                 slot->sl_datalen = 0;
1558                 return;
1559         }
1560         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1561         base = (char *)resp->cstate.datap -
1562                                         (char *)resp->xbuf->head[0].iov_base;
1563         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1564                                     slot->sl_datalen))
1565                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1566         return;
1567 }
1568
1569 /*
1570  * Encode the replay sequence operation from the slot values.
1571  * If cachethis is FALSE encode the uncached rep error on the next
1572  * operation which sets resp->p and increments resp->opcnt for
1573  * nfs4svc_encode_compoundres.
1574  *
1575  */
1576 static __be32
1577 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1578                           struct nfsd4_compoundres *resp)
1579 {
1580         struct nfsd4_op *op;
1581         struct nfsd4_slot *slot = resp->cstate.slot;
1582
1583         /* Encode the replayed sequence operation */
1584         op = &args->ops[resp->opcnt - 1];
1585         nfsd4_encode_operation(resp, op);
1586
1587         /* Return nfserr_retry_uncached_rep in next operation. */
1588         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1589                 op = &args->ops[resp->opcnt++];
1590                 op->status = nfserr_retry_uncached_rep;
1591                 nfsd4_encode_operation(resp, op);
1592         }
1593         return op->status;
1594 }
1595
1596 /*
1597  * The sequence operation is not cached because we can use the slot and
1598  * session values.
1599  */
1600 static __be32
1601 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1602                          struct nfsd4_sequence *seq)
1603 {
1604         struct nfsd4_slot *slot = resp->cstate.slot;
1605         __be32 status;
1606
1607         dprintk("--> %s slot %p\n", __func__, slot);
1608
1609         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1610         if (status)
1611                 return status;
1612
1613         /* The sequence operation has been encoded, cstate->datap set. */
1614         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1615
1616         resp->opcnt = slot->sl_opcnt;
1617         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1618         status = slot->sl_status;
1619
1620         return status;
1621 }
1622
1623 /*
1624  * Set the exchange_id flags returned by the server.
1625  */
1626 static void
1627 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1628 {
1629         /* pNFS is not supported */
1630         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1631
1632         /* Referrals are supported, Migration is not. */
1633         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1634
1635         /* set the wire flags to return to client. */
1636         clid->flags = new->cl_exchange_flags;
1637 }
1638
1639 static bool client_has_state(struct nfs4_client *clp)
1640 {
1641         /*
1642          * Note clp->cl_openowners check isn't quite right: there's no
1643          * need to count owners without stateid's.
1644          *
1645          * Also note we should probably be using this in 4.0 case too.
1646          */
1647         return !list_empty(&clp->cl_openowners)
1648                 || !list_empty(&clp->cl_delegations)
1649                 || !list_empty(&clp->cl_sessions);
1650 }
1651
1652 __be32
1653 nfsd4_exchange_id(struct svc_rqst *rqstp,
1654                   struct nfsd4_compound_state *cstate,
1655                   struct nfsd4_exchange_id *exid)
1656 {
1657         struct nfs4_client *unconf, *conf, *new;
1658         __be32 status;
1659         char                    addr_str[INET6_ADDRSTRLEN];
1660         nfs4_verifier           verf = exid->verifier;
1661         struct sockaddr         *sa = svc_addr(rqstp);
1662         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1663         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1664
1665         rpc_ntop(sa, addr_str, sizeof(addr_str));
1666         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1667                 "ip_addr=%s flags %x, spa_how %d\n",
1668                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1669                 addr_str, exid->flags, exid->spa_how);
1670
1671         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1672                 return nfserr_inval;
1673
1674         switch (exid->spa_how) {
1675         case SP4_MACH_CRED:
1676                 if (!svc_rqst_integrity_protected(rqstp))
1677                         return nfserr_inval;
1678         case SP4_NONE:
1679                 break;
1680         default:                                /* checked by xdr code */
1681                 WARN_ON_ONCE(1);
1682         case SP4_SSV:
1683                 return nfserr_encr_alg_unsupp;
1684         }
1685
1686         /* Cases below refer to rfc 5661 section 18.35.4: */
1687         nfs4_lock_state();
1688         conf = find_confirmed_client_by_name(&exid->clname, nn);
1689         if (conf) {
1690                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1691                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1692
1693                 if (update) {
1694                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1695                                 status = nfserr_inval;
1696                                 goto out;
1697                         }
1698                         if (!mach_creds_match(conf, rqstp)) {
1699                                 status = nfserr_wrong_cred;
1700                                 goto out;
1701                         }
1702                         if (!creds_match) { /* case 9 */
1703                                 status = nfserr_perm;
1704                                 goto out;
1705                         }
1706                         if (!verfs_match) { /* case 8 */
1707                                 status = nfserr_not_same;
1708                                 goto out;
1709                         }
1710                         /* case 6 */
1711                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1712                         new = conf;
1713                         goto out_copy;
1714                 }
1715                 if (!creds_match) { /* case 3 */
1716                         if (client_has_state(conf)) {
1717                                 status = nfserr_clid_inuse;
1718                                 goto out;
1719                         }
1720                         expire_client(conf);
1721                         goto out_new;
1722                 }
1723                 if (verfs_match) { /* case 2 */
1724                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1725                         new = conf;
1726                         goto out_copy;
1727                 }
1728                 /* case 5, client reboot */
1729                 goto out_new;
1730         }
1731
1732         if (update) { /* case 7 */
1733                 status = nfserr_noent;
1734                 goto out;
1735         }
1736
1737         unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
1738         if (unconf) /* case 4, possible retry or client restart */
1739                 expire_client(unconf);
1740
1741         /* case 1 (normal case) */
1742 out_new:
1743         new = create_client(exid->clname, rqstp, &verf);
1744         if (new == NULL) {
1745                 status = nfserr_jukebox;
1746                 goto out;
1747         }
1748         new->cl_minorversion = cstate->minorversion;
1749         new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
1750
1751         gen_clid(new, nn);
1752         add_to_unconfirmed(new);
1753 out_copy:
1754         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1755         exid->clientid.cl_id = new->cl_clientid.cl_id;
1756
1757         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1758         nfsd4_set_ex_flags(new, exid);
1759
1760         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1761                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1762         status = nfs_ok;
1763
1764 out:
1765         nfs4_unlock_state();
1766         return status;
1767 }
1768
1769 static __be32
1770 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1771 {
1772         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1773                 slot_seqid);
1774
1775         /* The slot is in use, and no response has been sent. */
1776         if (slot_inuse) {
1777                 if (seqid == slot_seqid)
1778                         return nfserr_jukebox;
1779                 else
1780                         return nfserr_seq_misordered;
1781         }
1782         /* Note unsigned 32-bit arithmetic handles wraparound: */
1783         if (likely(seqid == slot_seqid + 1))
1784                 return nfs_ok;
1785         if (seqid == slot_seqid)
1786                 return nfserr_replay_cache;
1787         return nfserr_seq_misordered;
1788 }
1789
1790 /*
1791  * Cache the create session result into the create session single DRC
1792  * slot cache by saving the xdr structure. sl_seqid has been set.
1793  * Do this for solo or embedded create session operations.
1794  */
1795 static void
1796 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1797                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1798 {
1799         slot->sl_status = nfserr;
1800         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1801 }
1802
1803 static __be32
1804 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1805                             struct nfsd4_clid_slot *slot)
1806 {
1807         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1808         return slot->sl_status;
1809 }
1810
1811 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1812                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1813                         1 +     /* MIN tag is length with zero, only length */ \
1814                         3 +     /* version, opcount, opcode */ \
1815                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1816                                 /* seqid, slotID, slotID, cache */ \
1817                         4 ) * sizeof(__be32))
1818
1819 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1820                         2 +     /* verifier: AUTH_NULL, length 0 */\
1821                         1 +     /* status */ \
1822                         1 +     /* MIN tag is length with zero, only length */ \
1823                         3 +     /* opcount, opcode, opstatus*/ \
1824                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1825                                 /* seqid, slotID, slotID, slotID, status */ \
1826                         5 ) * sizeof(__be32))
1827
1828 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1829 {
1830         u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
1831
1832         if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
1833                 return nfserr_toosmall;
1834         if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
1835                 return nfserr_toosmall;
1836         ca->headerpadsz = 0;
1837         ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
1838         ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
1839         ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
1840         ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
1841                         NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
1842         ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
1843         /*
1844          * Note decreasing slot size below client's request may make it
1845          * difficult for client to function correctly, whereas
1846          * decreasing the number of slots will (just?) affect
1847          * performance.  When short on memory we therefore prefer to
1848          * decrease number of slots instead of their size.  Clients that
1849          * request larger slots than they need will get poor results:
1850          */
1851         ca->maxreqs = nfsd4_get_drc_mem(ca);
1852         if (!ca->maxreqs)
1853                 return nfserr_jukebox;
1854
1855         return nfs_ok;
1856 }
1857
1858 #define NFSD_CB_MAX_REQ_SZ      ((NFS4_enc_cb_recall_sz + \
1859                                  RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
1860 #define NFSD_CB_MAX_RESP_SZ     ((NFS4_dec_cb_recall_sz + \
1861                                  RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
1862
1863 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
1864 {
1865         ca->headerpadsz = 0;
1866
1867         /*
1868          * These RPC_MAX_HEADER macros are overkill, especially since we
1869          * don't even do gss on the backchannel yet.  But this is still
1870          * less than 1k.  Tighten up this estimate in the unlikely event
1871          * it turns out to be a problem for some client:
1872          */
1873         if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
1874                 return nfserr_toosmall;
1875         if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
1876                 return nfserr_toosmall;
1877         ca->maxresp_cached = 0;
1878         if (ca->maxops < 2)
1879                 return nfserr_toosmall;
1880
1881         return nfs_ok;
1882 }
1883
1884 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
1885 {
1886         switch (cbs->flavor) {
1887         case RPC_AUTH_NULL:
1888         case RPC_AUTH_UNIX:
1889                 return nfs_ok;
1890         default:
1891                 /*
1892                  * GSS case: the spec doesn't allow us to return this
1893                  * error.  But it also doesn't allow us not to support
1894                  * GSS.
1895                  * I'd rather this fail hard than return some error the
1896                  * client might think it can already handle:
1897                  */
1898                 return nfserr_encr_alg_unsupp;
1899         }
1900 }
1901
1902 __be32
1903 nfsd4_create_session(struct svc_rqst *rqstp,
1904                      struct nfsd4_compound_state *cstate,
1905                      struct nfsd4_create_session *cr_ses)
1906 {
1907         struct sockaddr *sa = svc_addr(rqstp);
1908         struct nfs4_client *conf, *unconf;
1909         struct nfsd4_session *new;
1910         struct nfsd4_conn *conn;
1911         struct nfsd4_clid_slot *cs_slot = NULL;
1912         __be32 status = 0;
1913         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1914
1915         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1916                 return nfserr_inval;
1917         status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
1918         if (status)
1919                 return status;
1920         status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
1921         if (status)
1922                 return status;
1923         status = check_backchannel_attrs(&cr_ses->back_channel);
1924         if (status)
1925                 goto out_release_drc_mem;
1926         status = nfserr_jukebox;
1927         new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
1928         if (!new)
1929                 goto out_release_drc_mem;
1930         conn = alloc_conn_from_crses(rqstp, cr_ses);
1931         if (!conn)
1932                 goto out_free_session;
1933
1934         nfs4_lock_state();
1935         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1936         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1937         WARN_ON_ONCE(conf && unconf);
1938
1939         if (conf) {
1940                 status = nfserr_wrong_cred;
1941                 if (!mach_creds_match(conf, rqstp))
1942                         goto out_free_conn;
1943                 cs_slot = &conf->cl_cs_slot;
1944                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1945                 if (status == nfserr_replay_cache) {
1946                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1947                         goto out_free_conn;
1948                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1949                         status = nfserr_seq_misordered;
1950                         goto out_free_conn;
1951                 }
1952         } else if (unconf) {
1953                 struct nfs4_client *old;
1954                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1955                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1956                         status = nfserr_clid_inuse;
1957                         goto out_free_conn;
1958                 }
1959                 status = nfserr_wrong_cred;
1960                 if (!mach_creds_match(unconf, rqstp))
1961                         goto out_free_conn;
1962                 cs_slot = &unconf->cl_cs_slot;
1963                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1964                 if (status) {
1965                         /* an unconfirmed replay returns misordered */
1966                         status = nfserr_seq_misordered;
1967                         goto out_free_conn;
1968                 }
1969                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1970                 if (old) {
1971                         status = mark_client_expired(old);
1972                         if (status)
1973                                 goto out_free_conn;
1974                         expire_client(old);
1975                 }
1976                 move_to_confirmed(unconf);
1977                 conf = unconf;
1978         } else {
1979                 status = nfserr_stale_clientid;
1980                 goto out_free_conn;
1981         }
1982         status = nfs_ok;
1983         /*
1984          * We do not support RDMA or persistent sessions
1985          */
1986         cr_ses->flags &= ~SESSION4_PERSIST;
1987         cr_ses->flags &= ~SESSION4_RDMA;
1988
1989         init_session(rqstp, new, conf, cr_ses);
1990         nfsd4_init_conn(rqstp, conn, new);
1991
1992         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1993                NFS4_MAX_SESSIONID_LEN);
1994         cs_slot->sl_seqid++;
1995         cr_ses->seqid = cs_slot->sl_seqid;
1996
1997         /* cache solo and embedded create sessions under the state lock */
1998         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1999         nfs4_unlock_state();
2000         return status;
2001 out_free_conn:
2002         nfs4_unlock_state();
2003         free_conn(conn);
2004 out_free_session:
2005         __free_session(new);
2006 out_release_drc_mem:
2007         nfsd4_put_drc_mem(&cr_ses->fore_channel);
2008         return status;
2009 }
2010
2011 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2012 {
2013         switch (*dir) {
2014         case NFS4_CDFC4_FORE:
2015         case NFS4_CDFC4_BACK:
2016                 return nfs_ok;
2017         case NFS4_CDFC4_FORE_OR_BOTH:
2018         case NFS4_CDFC4_BACK_OR_BOTH:
2019                 *dir = NFS4_CDFC4_BOTH;
2020                 return nfs_ok;
2021         };
2022         return nfserr_inval;
2023 }
2024
2025 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2026 {
2027         struct nfsd4_session *session = cstate->session;
2028         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2029         __be32 status;
2030
2031         status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2032         if (status)
2033                 return status;
2034         spin_lock(&nn->client_lock);
2035         session->se_cb_prog = bc->bc_cb_program;
2036         session->se_cb_sec = bc->bc_cb_sec;
2037         spin_unlock(&nn->client_lock);
2038
2039         nfsd4_probe_callback(session->se_client);
2040
2041         return nfs_ok;
2042 }
2043
2044 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2045                      struct nfsd4_compound_state *cstate,
2046                      struct nfsd4_bind_conn_to_session *bcts)
2047 {
2048         __be32 status;
2049         struct nfsd4_conn *conn;
2050         struct nfsd4_session *session;
2051         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2052
2053         if (!nfsd4_last_compound_op(rqstp))
2054                 return nfserr_not_only_op;
2055         nfs4_lock_state();
2056         spin_lock(&nn->client_lock);
2057         session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
2058         spin_unlock(&nn->client_lock);
2059         status = nfserr_badsession;
2060         if (!session)
2061                 goto out;
2062         status = nfserr_wrong_cred;
2063         if (!mach_creds_match(session->se_client, rqstp))
2064                 goto out;
2065         status = nfsd4_map_bcts_dir(&bcts->dir);
2066         if (status)
2067                 goto out;
2068         conn = alloc_conn(rqstp, bcts->dir);
2069         status = nfserr_jukebox;
2070         if (!conn)
2071                 goto out;
2072         nfsd4_init_conn(rqstp, conn, session);
2073         status = nfs_ok;
2074 out:
2075         nfs4_unlock_state();
2076         return status;
2077 }
2078
2079 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2080 {
2081         if (!session)
2082                 return 0;
2083         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2084 }
2085
2086 __be32
2087 nfsd4_destroy_session(struct svc_rqst *r,
2088                       struct nfsd4_compound_state *cstate,
2089                       struct nfsd4_destroy_session *sessionid)
2090 {
2091         struct nfsd4_session *ses;
2092         __be32 status;
2093         int ref_held_by_me = 0;
2094         struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
2095
2096         nfs4_lock_state();
2097         status = nfserr_not_only_op;
2098         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2099                 if (!nfsd4_last_compound_op(r))
2100                         goto out;
2101                 ref_held_by_me++;
2102         }
2103         dump_sessionid(__func__, &sessionid->sessionid);
2104         spin_lock(&nn->client_lock);
2105         ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
2106         status = nfserr_badsession;
2107         if (!ses)
2108                 goto out_client_lock;
2109         status = nfserr_wrong_cred;
2110         if (!mach_creds_match(ses->se_client, r))
2111                 goto out_client_lock;
2112         nfsd4_get_session_locked(ses);
2113         status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2114         if (status)
2115                 goto out_put_session;
2116         unhash_session(ses);
2117         spin_unlock(&nn->client_lock);
2118
2119         nfsd4_probe_callback_sync(ses->se_client);
2120
2121         spin_lock(&nn->client_lock);
2122         status = nfs_ok;
2123 out_put_session:
2124         nfsd4_put_session(ses);
2125 out_client_lock:
2126         spin_unlock(&nn->client_lock);
2127 out:
2128         nfs4_unlock_state();
2129         return status;
2130 }
2131
2132 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2133 {
2134         struct nfsd4_conn *c;
2135
2136         list_for_each_entry(c, &s->se_conns, cn_persession) {
2137                 if (c->cn_xprt == xpt) {
2138                         return c;
2139                 }
2140         }
2141         return NULL;
2142 }
2143
2144 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2145 {
2146         struct nfs4_client *clp = ses->se_client;
2147         struct nfsd4_conn *c;
2148         __be32 status = nfs_ok;
2149         int ret;
2150
2151         spin_lock(&clp->cl_lock);
2152         c = __nfsd4_find_conn(new->cn_xprt, ses);
2153         if (c)
2154                 goto out_free;
2155         status = nfserr_conn_not_bound_to_session;
2156         if (clp->cl_mach_cred)
2157                 goto out_free;
2158         __nfsd4_hash_conn(new, ses);
2159         spin_unlock(&clp->cl_lock);
2160         ret = nfsd4_register_conn(new);
2161         if (ret)
2162                 /* oops; xprt is already down: */
2163                 nfsd4_conn_lost(&new->cn_xpt_user);
2164         return nfs_ok;
2165 out_free:
2166         spin_unlock(&clp->cl_lock);
2167         free_conn(new);
2168         return status;
2169 }
2170
2171 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2172 {
2173         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2174
2175         return args->opcnt > session->se_fchannel.maxops;
2176 }
2177
2178 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2179                                   struct nfsd4_session *session)
2180 {
2181         struct xdr_buf *xb = &rqstp->rq_arg;
2182
2183         return xb->len > session->se_fchannel.maxreq_sz;
2184 }
2185
2186 __be32
2187 nfsd4_sequence(struct svc_rqst *rqstp,
2188                struct nfsd4_compound_state *cstate,
2189                struct nfsd4_sequence *seq)
2190 {
2191         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2192         struct nfsd4_session *session;
2193         struct nfs4_client *clp;
2194         struct nfsd4_slot *slot;
2195         struct nfsd4_conn *conn;
2196         __be32 status;
2197         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2198
2199         if (resp->opcnt != 1)
2200                 return nfserr_sequence_pos;
2201
2202         /*
2203          * Will be either used or freed by nfsd4_sequence_check_conn
2204          * below.
2205          */
2206         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2207         if (!conn)
2208                 return nfserr_jukebox;
2209
2210         spin_lock(&nn->client_lock);
2211         status = nfserr_badsession;
2212         session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
2213         if (!session)
2214                 goto out_no_session;
2215         clp = session->se_client;
2216         status = get_client_locked(clp);
2217         if (status)
2218                 goto out_no_session;
2219         status = nfsd4_get_session_locked(session);
2220         if (status)
2221                 goto out_put_client;
2222
2223         status = nfserr_too_many_ops;
2224         if (nfsd4_session_too_many_ops(rqstp, session))
2225                 goto out_put_session;
2226
2227         status = nfserr_req_too_big;
2228         if (nfsd4_request_too_big(rqstp, session))
2229                 goto out_put_session;
2230
2231         status = nfserr_badslot;
2232         if (seq->slotid >= session->se_fchannel.maxreqs)
2233                 goto out_put_session;
2234
2235         slot = session->se_slots[seq->slotid];
2236         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2237
2238         /* We do not negotiate the number of slots yet, so set the
2239          * maxslots to the session maxreqs which is used to encode
2240          * sr_highest_slotid and the sr_target_slot id to maxslots */
2241         seq->maxslots = session->se_fchannel.maxreqs;
2242
2243         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2244                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2245         if (status == nfserr_replay_cache) {
2246                 status = nfserr_seq_misordered;
2247                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2248                         goto out_put_session;
2249                 cstate->slot = slot;
2250                 cstate->session = session;
2251                 /* Return the cached reply status and set cstate->status
2252                  * for nfsd4_proc_compound processing */
2253                 status = nfsd4_replay_cache_entry(resp, seq);
2254                 cstate->status = nfserr_replay_cache;
2255                 goto out;
2256         }
2257         if (status)
2258                 goto out_put_session;
2259
2260         status = nfsd4_sequence_check_conn(conn, session);
2261         conn = NULL;
2262         if (status)
2263                 goto out_put_session;
2264
2265         /* Success! bump slot seqid */
2266         slot->sl_seqid = seq->seqid;
2267         slot->sl_flags |= NFSD4_SLOT_INUSE;
2268         if (seq->cachethis)
2269                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2270         else
2271                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2272
2273         cstate->slot = slot;
2274         cstate->session = session;
2275
2276 out:
2277         switch (clp->cl_cb_state) {
2278         case NFSD4_CB_DOWN:
2279                 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2280                 break;
2281         case NFSD4_CB_FAULT:
2282                 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2283                 break;
2284         default:
2285                 seq->status_flags = 0;
2286         }
2287         if (!list_empty(&clp->cl_revoked))
2288                 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2289 out_no_session:
2290         if (conn)
2291                 free_conn(conn);
2292         spin_unlock(&nn->client_lock);
2293         return status;
2294 out_put_session:
2295         nfsd4_put_session(session);
2296 out_put_client:
2297         put_client_renew_locked(clp);
2298         goto out_no_session;
2299 }
2300
2301 __be32
2302 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2303 {
2304         struct nfs4_client *conf, *unconf, *clp;
2305         __be32 status = 0;
2306         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2307
2308         nfs4_lock_state();
2309         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2310         conf = find_confirmed_client(&dc->clientid, true, nn);
2311         WARN_ON_ONCE(conf && unconf);
2312
2313         if (conf) {
2314                 clp = conf;
2315
2316                 if (client_has_state(conf)) {
2317                         status = nfserr_clientid_busy;
2318                         goto out;
2319                 }
2320         } else if (unconf)
2321                 clp = unconf;
2322         else {
2323                 status = nfserr_stale_clientid;
2324                 goto out;
2325         }
2326         if (!mach_creds_match(clp, rqstp)) {
2327                 status = nfserr_wrong_cred;
2328                 goto out;
2329         }
2330         expire_client(clp);
2331 out:
2332         nfs4_unlock_state();
2333         return status;
2334 }
2335
2336 __be32
2337 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2338 {
2339         __be32 status = 0;
2340
2341         if (rc->rca_one_fs) {
2342                 if (!cstate->current_fh.fh_dentry)
2343                         return nfserr_nofilehandle;
2344                 /*
2345                  * We don't take advantage of the rca_one_fs case.
2346                  * That's OK, it's optional, we can safely ignore it.
2347                  */
2348                  return nfs_ok;
2349         }
2350
2351         nfs4_lock_state();
2352         status = nfserr_complete_already;
2353         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2354                              &cstate->session->se_client->cl_flags))
2355                 goto out;
2356
2357         status = nfserr_stale_clientid;
2358         if (is_client_expired(cstate->session->se_client))
2359                 /*
2360                  * The following error isn't really legal.
2361                  * But we only get here if the client just explicitly
2362                  * destroyed the client.  Surely it no longer cares what
2363                  * error it gets back on an operation for the dead
2364                  * client.
2365                  */
2366                 goto out;
2367
2368         status = nfs_ok;
2369         nfsd4_client_record_create(cstate->session->se_client);
2370 out:
2371         nfs4_unlock_state();
2372         return status;
2373 }
2374
2375 __be32
2376 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2377                   struct nfsd4_setclientid *setclid)
2378 {
2379         struct xdr_netobj       clname = setclid->se_name;
2380         nfs4_verifier           clverifier = setclid->se_verf;
2381         struct nfs4_client      *conf, *unconf, *new;
2382         __be32                  status;
2383         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2384
2385         /* Cases below refer to rfc 3530 section 14.2.33: */
2386         nfs4_lock_state();
2387         conf = find_confirmed_client_by_name(&clname, nn);
2388         if (conf) {
2389                 /* case 0: */
2390                 status = nfserr_clid_inuse;
2391                 if (clp_used_exchangeid(conf))
2392                         goto out;
2393                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2394                         char addr_str[INET6_ADDRSTRLEN];
2395                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2396                                  sizeof(addr_str));
2397                         dprintk("NFSD: setclientid: string in use by client "
2398                                 "at %s\n", addr_str);
2399                         goto out;
2400                 }
2401         }
2402         unconf = find_unconfirmed_client_by_name(&clname, nn);
2403         if (unconf)
2404                 expire_client(unconf);
2405         status = nfserr_jukebox;
2406         new = create_client(clname, rqstp, &clverifier);
2407         if (new == NULL)
2408                 goto out;
2409         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2410                 /* case 1: probable callback update */
2411                 copy_clid(new, conf);
2412         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2413                 gen_clid(new, nn);
2414         new->cl_minorversion = 0;
2415         gen_callback(new, setclid, rqstp);
2416         add_to_unconfirmed(new);
2417         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2418         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2419         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2420         status = nfs_ok;
2421 out:
2422         nfs4_unlock_state();
2423         return status;
2424 }
2425
2426
2427 __be32
2428 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2429                          struct nfsd4_compound_state *cstate,
2430                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2431 {
2432         struct nfs4_client *conf, *unconf;
2433         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2434         clientid_t * clid = &setclientid_confirm->sc_clientid;
2435         __be32 status;
2436         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2437
2438         if (STALE_CLIENTID(clid, nn))
2439                 return nfserr_stale_clientid;
2440         nfs4_lock_state();
2441
2442         conf = find_confirmed_client(clid, false, nn);
2443         unconf = find_unconfirmed_client(clid, false, nn);
2444         /*
2445          * We try hard to give out unique clientid's, so if we get an
2446          * attempt to confirm the same clientid with a different cred,
2447          * there's a bug somewhere.  Let's charitably assume it's our
2448          * bug.
2449          */
2450         status = nfserr_serverfault;
2451         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2452                 goto out;
2453         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2454                 goto out;
2455         /* cases below refer to rfc 3530 section 14.2.34: */
2456         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2457                 if (conf && !unconf) /* case 2: probable retransmit */
2458                         status = nfs_ok;
2459                 else /* case 4: client hasn't noticed we rebooted yet? */
2460                         status = nfserr_stale_clientid;
2461                 goto out;
2462         }
2463         status = nfs_ok;
2464         if (conf) { /* case 1: callback update */
2465                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2466                 nfsd4_probe_callback(conf);
2467                 expire_client(unconf);
2468         } else { /* case 3: normal case; new or rebooted client */
2469                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2470                 if (conf) {
2471                         status = mark_client_expired(conf);
2472                         if (status)
2473                                 goto out;
2474                         expire_client(conf);
2475                 }
2476                 move_to_confirmed(unconf);
2477                 nfsd4_probe_callback(unconf);
2478         }
2479 out:
2480         nfs4_unlock_state();
2481         return status;
2482 }
2483
2484 static struct nfs4_file *nfsd4_alloc_file(void)
2485 {
2486         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2487 }
2488
2489 /* OPEN Share state helper functions */
2490 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2491 {
2492         unsigned int hashval = file_hashval(ino);
2493
2494         atomic_set(&fp->fi_ref, 1);
2495         INIT_LIST_HEAD(&fp->fi_stateids);
2496         INIT_LIST_HEAD(&fp->fi_delegations);
2497         fp->fi_inode = igrab(ino);
2498         fp->fi_had_conflict = false;
2499         fp->fi_lease = NULL;
2500         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2501         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2502         spin_lock(&recall_lock);
2503         hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
2504         spin_unlock(&recall_lock);
2505 }
2506
2507 static void
2508 nfsd4_free_slab(struct kmem_cache **slab)
2509 {
2510         if (*slab == NULL)
2511                 return;
2512         kmem_cache_destroy(*slab);
2513         *slab = NULL;
2514 }
2515
2516 void
2517 nfsd4_free_slabs(void)
2518 {
2519         nfsd4_free_slab(&openowner_slab);
2520         nfsd4_free_slab(&lockowner_slab);
2521         nfsd4_free_slab(&file_slab);
2522         nfsd4_free_slab(&stateid_slab);
2523         nfsd4_free_slab(&deleg_slab);
2524 }
2525
2526 int
2527 nfsd4_init_slabs(void)
2528 {
2529         openowner_slab = kmem_cache_create("nfsd4_openowners",
2530                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2531         if (openowner_slab == NULL)
2532                 goto out_nomem;
2533         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2534                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2535         if (lockowner_slab == NULL)
2536                 goto out_nomem;
2537         file_slab = kmem_cache_create("nfsd4_files",
2538                         sizeof(struct nfs4_file), 0, 0, NULL);
2539         if (file_slab == NULL)
2540                 goto out_nomem;
2541         stateid_slab = kmem_cache_create("nfsd4_stateids",
2542                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2543         if (stateid_slab == NULL)
2544                 goto out_nomem;
2545         deleg_slab = kmem_cache_create("nfsd4_delegations",
2546                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2547         if (deleg_slab == NULL)
2548                 goto out_nomem;
2549         return 0;
2550 out_nomem:
2551         nfsd4_free_slabs();
2552         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2553         return -ENOMEM;
2554 }
2555
2556 void nfs4_free_openowner(struct nfs4_openowner *oo)
2557 {
2558         kfree(oo->oo_owner.so_owner.data);
2559         kmem_cache_free(openowner_slab, oo);
2560 }
2561
2562 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2563 {
2564         kfree(lo->lo_owner.so_owner.data);
2565         kmem_cache_free(lockowner_slab, lo);
2566 }
2567
2568 static void init_nfs4_replay(struct nfs4_replay *rp)
2569 {
2570         rp->rp_status = nfserr_serverfault;
2571         rp->rp_buflen = 0;
2572         rp->rp_buf = rp->rp_ibuf;
2573 }
2574
2575 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2576 {
2577         struct nfs4_stateowner *sop;
2578
2579         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2580         if (!sop)
2581                 return NULL;
2582
2583         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2584         if (!sop->so_owner.data) {
2585                 kmem_cache_free(slab, sop);
2586                 return NULL;
2587         }
2588         sop->so_owner.len = owner->len;
2589
2590         INIT_LIST_HEAD(&sop->so_stateids);
2591         sop->so_client = clp;
2592         init_nfs4_replay(&sop->so_replay);
2593         return sop;
2594 }
2595
2596 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2597 {
2598         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2599
2600         list_add(&oo->oo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
2601         list_add(&oo->oo_perclient, &clp->cl_openowners);
2602 }
2603
2604 static struct nfs4_openowner *
2605 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2606         struct nfs4_openowner *oo;
2607
2608         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2609         if (!oo)
2610                 return NULL;
2611         oo->oo_owner.so_is_open_owner = 1;
2612         oo->oo_owner.so_seqid = open->op_seqid;
2613         oo->oo_flags = NFS4_OO_NEW;
2614         oo->oo_time = 0;
2615         oo->oo_last_closed_stid = NULL;
2616         INIT_LIST_HEAD(&oo->oo_close_lru);
2617         hash_openowner(oo, clp, strhashval);
2618         return oo;
2619 }
2620
2621 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2622         struct nfs4_openowner *oo = open->op_openowner;
2623
2624         stp->st_stid.sc_type = NFS4_OPEN_STID;
2625         INIT_LIST_HEAD(&stp->st_lockowners);
2626         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2627         list_add(&stp->st_perfile, &fp->fi_stateids);
2628         stp->st_stateowner = &oo->oo_owner;
2629         get_nfs4_file(fp);
2630         stp->st_file = fp;
2631         stp->st_access_bmap = 0;
2632         stp->st_deny_bmap = 0;
2633         set_access(open->op_share_access, stp);
2634         set_deny(open->op_share_deny, stp);
2635         stp->st_openstp = NULL;
2636 }
2637
2638 static void
2639 move_to_close_lru(struct nfs4_openowner *oo, struct net *net)
2640 {
2641         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2642
2643         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2644
2645         list_move_tail(&oo->oo_close_lru, &nn->close_lru);
2646         oo->oo_time = get_seconds();
2647 }
2648
2649 static int
2650 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2651                                                         clientid_t *clid)
2652 {
2653         return (sop->so_owner.len == owner->len) &&
2654                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2655                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2656 }
2657
2658 static struct nfs4_openowner *
2659 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
2660                         bool sessions, struct nfsd_net *nn)
2661 {
2662         struct nfs4_stateowner *so;
2663         struct nfs4_openowner *oo;
2664         struct nfs4_client *clp;
2665
2666         list_for_each_entry(so, &nn->ownerstr_hashtbl[hashval], so_strhash) {
2667                 if (!so->so_is_open_owner)
2668                         continue;
2669                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2670                         oo = openowner(so);
2671                         clp = oo->oo_owner.so_client;
2672                         if ((bool)clp->cl_minorversion != sessions)
2673                                 return NULL;
2674                         renew_client(oo->oo_owner.so_client);
2675                         return oo;
2676                 }
2677         }
2678         return NULL;
2679 }
2680
2681 /* search file_hashtbl[] for file */
2682 static struct nfs4_file *
2683 find_file(struct inode *ino)
2684 {
2685         unsigned int hashval = file_hashval(ino);
2686         struct nfs4_file *fp;
2687
2688         spin_lock(&recall_lock);
2689         hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2690                 if (fp->fi_inode == ino) {
2691                         get_nfs4_file(fp);
2692                         spin_unlock(&recall_lock);
2693                         return fp;
2694                 }
2695         }
2696         spin_unlock(&recall_lock);
2697         return NULL;
2698 }
2699
2700 /*
2701  * Called to check deny when READ with all zero stateid or
2702  * WRITE with all zero or all one stateid
2703  */
2704 static __be32
2705 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2706 {
2707         struct inode *ino = current_fh->fh_dentry->d_inode;
2708         struct nfs4_file *fp;
2709         struct nfs4_ol_stateid *stp;
2710         __be32 ret;
2711
2712         fp = find_file(ino);
2713         if (!fp)
2714                 return nfs_ok;
2715         ret = nfserr_locked;
2716         /* Search for conflicting share reservations */
2717         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2718                 if (test_deny(deny_type, stp) ||
2719                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2720                         goto out;
2721         }
2722         ret = nfs_ok;
2723 out:
2724         put_nfs4_file(fp);
2725         return ret;
2726 }
2727
2728 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2729 {
2730         struct nfs4_client *clp = dp->dl_stid.sc_client;
2731         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2732
2733         /* We're assuming the state code never drops its reference
2734          * without first removing the lease.  Since we're in this lease
2735          * callback (and since the lease code is serialized by the kernel
2736          * lock) we know the server hasn't removed the lease yet, we know
2737          * it's safe to take a reference: */
2738         atomic_inc(&dp->dl_count);
2739
2740         list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
2741
2742         /* Only place dl_time is set; protected by i_lock: */
2743         dp->dl_time = get_seconds();
2744
2745         nfsd4_cb_recall(dp);
2746 }
2747
2748 /* Called from break_lease() with i_lock held. */
2749 static void nfsd_break_deleg_cb(struct file_lock *fl)
2750 {
2751         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2752         struct nfs4_delegation *dp;
2753
2754         if (!fp) {
2755                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2756                 return;
2757         }
2758         if (fp->fi_had_conflict) {
2759                 WARN(1, "duplicate break on %p\n", fp);
2760                 return;
2761         }
2762         /*
2763          * We don't want the locks code to timeout the lease for us;
2764          * we'll remove it ourself if a delegation isn't returned
2765          * in time:
2766          */
2767         fl->fl_break_time = 0;
2768
2769         spin_lock(&recall_lock);
2770         fp->fi_had_conflict = true;
2771         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2772                 nfsd_break_one_deleg(dp);
2773         spin_unlock(&recall_lock);
2774 }
2775
2776 static
2777 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2778 {
2779         if (arg & F_UNLCK)
2780                 return lease_modify(onlist, arg);
2781         else
2782                 return -EAGAIN;
2783 }
2784
2785 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2786         .lm_break = nfsd_break_deleg_cb,
2787         .lm_change = nfsd_change_deleg_cb,
2788 };
2789
2790 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2791 {
2792         if (nfsd4_has_session(cstate))
2793                 return nfs_ok;
2794         if (seqid == so->so_seqid - 1)
2795                 return nfserr_replay_me;
2796         if (seqid == so->so_seqid)
2797                 return nfs_ok;
2798         return nfserr_bad_seqid;
2799 }
2800
2801 __be32
2802 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2803                     struct nfsd4_open *open, struct nfsd_net *nn)
2804 {
2805         clientid_t *clientid = &open->op_clientid;
2806         struct nfs4_client *clp = NULL;
2807         unsigned int strhashval;
2808         struct nfs4_openowner *oo = NULL;
2809         __be32 status;
2810
2811         if (STALE_CLIENTID(&open->op_clientid, nn))
2812                 return nfserr_stale_clientid;
2813         /*
2814          * In case we need it later, after we've already created the
2815          * file and don't want to risk a further failure:
2816          */
2817         open->op_file = nfsd4_alloc_file();
2818         if (open->op_file == NULL)
2819                 return nfserr_jukebox;
2820
2821         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2822         oo = find_openstateowner_str(strhashval, open, cstate->minorversion, nn);
2823         open->op_openowner = oo;
2824         if (!oo) {
2825                 clp = find_confirmed_client(clientid, cstate->minorversion,
2826                                             nn);
2827                 if (clp == NULL)
2828                         return nfserr_expired;
2829                 goto new_owner;
2830         }
2831         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2832                 /* Replace unconfirmed owners without checking for replay. */
2833                 clp = oo->oo_owner.so_client;
2834                 release_openowner(oo);
2835                 open->op_openowner = NULL;
2836                 goto new_owner;
2837         }
2838         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2839         if (status)
2840                 return status;
2841         clp = oo->oo_owner.so_client;
2842         goto alloc_stateid;
2843 new_owner:
2844         oo = alloc_init_open_stateowner(strhashval, clp, open);
2845         if (oo == NULL)
2846                 return nfserr_jukebox;
2847         open->op_openowner = oo;
2848 alloc_stateid:
2849         open->op_stp = nfs4_alloc_stateid(clp);
2850         if (!open->op_stp)
2851                 return nfserr_jukebox;
2852         return nfs_ok;
2853 }
2854
2855 static inline __be32
2856 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2857 {
2858         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2859                 return nfserr_openmode;
2860         else
2861                 return nfs_ok;
2862 }
2863
2864 static int share_access_to_flags(u32 share_access)
2865 {
2866         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2867 }
2868
2869 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2870 {
2871         struct nfs4_stid *ret;
2872
2873         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2874         if (!ret)
2875                 return NULL;
2876         return delegstateid(ret);
2877 }
2878
2879 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2880 {
2881         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2882                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2883 }
2884
2885 static __be32
2886 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
2887                 struct nfs4_delegation **dp)
2888 {
2889         int flags;
2890         __be32 status = nfserr_bad_stateid;
2891
2892         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2893         if (*dp == NULL)
2894                 goto out;
2895         flags = share_access_to_flags(open->op_share_access);
2896         status = nfs4_check_delegmode(*dp, flags);
2897         if (status)
2898                 *dp = NULL;
2899 out:
2900         if (!nfsd4_is_deleg_cur(open))
2901                 return nfs_ok;
2902         if (status)
2903                 return status;
2904         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2905         return nfs_ok;
2906 }
2907
2908 static __be32
2909 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2910 {
2911         struct nfs4_ol_stateid *local;
2912         struct nfs4_openowner *oo = open->op_openowner;
2913
2914         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2915                 /* ignore lock owners */
2916                 if (local->st_stateowner->so_is_open_owner == 0)
2917                         continue;
2918                 /* remember if we have seen this open owner */
2919                 if (local->st_stateowner == &oo->oo_owner)
2920                         *stpp = local;
2921                 /* check for conflicting share reservations */
2922                 if (!test_share(local, open))
2923                         return nfserr_share_denied;
2924         }
2925         return nfs_ok;
2926 }
2927
2928 static inline int nfs4_access_to_access(u32 nfs4_access)
2929 {
2930         int flags = 0;
2931
2932         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2933                 flags |= NFSD_MAY_READ;
2934         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2935                 flags |= NFSD_MAY_WRITE;
2936         return flags;
2937 }
2938
2939 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2940                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2941 {
2942         __be32 status;
2943         int oflag = nfs4_access_to_omode(open->op_share_access);
2944         int access = nfs4_access_to_access(open->op_share_access);
2945
2946         if (!fp->fi_fds[oflag]) {
2947                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2948                         &fp->fi_fds[oflag]);
2949                 if (status)
2950                         return status;
2951         }
2952         nfs4_file_get_access(fp, oflag);
2953
2954         return nfs_ok;
2955 }
2956
2957 static inline __be32
2958 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2959                 struct nfsd4_open *open)
2960 {
2961         struct iattr iattr = {
2962                 .ia_valid = ATTR_SIZE,
2963                 .ia_size = 0,
2964         };
2965         if (!open->op_truncate)
2966                 return 0;
2967         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2968                 return nfserr_inval;
2969         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2970 }
2971
2972 static __be32
2973 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)
2974 {
2975         u32 op_share_access = open->op_share_access;
2976         bool new_access;
2977         __be32 status;
2978
2979         new_access = !test_access(op_share_access, stp);
2980         if (new_access) {
2981                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2982                 if (status)
2983                         return status;
2984         }
2985         status = nfsd4_truncate(rqstp, cur_fh, open);
2986         if (status) {
2987                 if (new_access) {
2988                         int oflag = nfs4_access_to_omode(op_share_access);
2989                         nfs4_file_put_access(fp, oflag);
2990                 }
2991                 return status;
2992         }
2993         /* remember the open */
2994         set_access(op_share_access, stp);
2995         set_deny(open->op_share_deny, stp);
2996
2997         return nfs_ok;
2998 }
2999
3000
3001 static void
3002 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3003 {
3004         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3005 }
3006
3007 /* Should we give out recallable state?: */
3008 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3009 {
3010         if (clp->cl_cb_state == NFSD4_CB_UP)
3011                 return true;
3012         /*
3013          * In the sessions case, since we don't have to establish a
3014          * separate connection for callbacks, we assume it's OK
3015          * until we hear otherwise:
3016          */
3017         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3018 }
3019
3020 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
3021 {
3022         struct file_lock *fl;
3023
3024         fl = locks_alloc_lock();
3025         if (!fl)
3026                 return NULL;
3027         locks_init_lock(fl);
3028         fl->fl_lmops = &nfsd_lease_mng_ops;
3029         fl->fl_flags = FL_DELEG;
3030         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3031         fl->fl_end = OFFSET_MAX;
3032         fl->fl_owner = (fl_owner_t)(dp->dl_file);
3033         fl->fl_pid = current->tgid;
3034         return fl;
3035 }
3036
3037 static int nfs4_setlease(struct nfs4_delegation *dp)
3038 {
3039         struct nfs4_file *fp = dp->dl_file;
3040         struct file_lock *fl;
3041         int status;
3042
3043         fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
3044         if (!fl)
3045                 return -ENOMEM;
3046         fl->fl_file = find_readable_file(fp);
3047         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
3048         if (status)
3049                 goto out_free;
3050         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3051         fp->fi_lease = fl;
3052         fp->fi_deleg_file = get_file(fl->fl_file);
3053         atomic_set(&fp->fi_delegees, 1);
3054         list_add(&dp->dl_perfile, &fp->fi_delegations);
3055         return 0;
3056 out_free:
3057         locks_free_lock(fl);
3058         return status;
3059 }
3060
3061 static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
3062 {
3063         int status;
3064
3065         if (fp->fi_had_conflict)
3066                 return -EAGAIN;
3067         get_nfs4_file(fp);
3068         dp->dl_file = fp;
3069         if (!fp->fi_lease) {
3070                 status = nfs4_setlease(dp);
3071                 if (status)
3072                         goto out_free;
3073                 return 0;
3074         }
3075         spin_lock(&recall_lock);
3076         if (fp->fi_had_conflict) {
3077                 spin_unlock(&recall_lock);
3078                 status = -EAGAIN;
3079                 goto out_free;
3080         }
3081         atomic_inc(&fp->fi_delegees);
3082         list_add(&dp->dl_perfile, &fp->fi_delegations);
3083         spin_unlock(&recall_lock);
3084         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
3085         return 0;
3086 out_free:
3087         put_nfs4_file(fp);
3088         dp->dl_file = fp;
3089         return status;
3090 }
3091
3092 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3093 {
3094         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3095         if (status == -EAGAIN)
3096                 open->op_why_no_deleg = WND4_CONTENTION;
3097         else {
3098                 open->op_why_no_deleg = WND4_RESOURCE;
3099                 switch (open->op_deleg_want) {
3100                 case NFS4_SHARE_WANT_READ_DELEG:
3101                 case NFS4_SHARE_WANT_WRITE_DELEG:
3102                 case NFS4_SHARE_WANT_ANY_DELEG:
3103                         break;
3104                 case NFS4_SHARE_WANT_CANCEL:
3105                         open->op_why_no_deleg = WND4_CANCELLED;
3106                         break;
3107                 case NFS4_SHARE_WANT_NO_DELEG:
3108                         WARN_ON_ONCE(1);
3109                 }
3110         }
3111 }
3112
3113 /*
3114  * Attempt to hand out a delegation.
3115  *
3116  * Note we don't support write delegations, and won't until the vfs has
3117  * proper support for them.
3118  */
3119 static void
3120 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
3121                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
3122 {
3123         struct nfs4_delegation *dp;
3124         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
3125         int cb_up;
3126         int status = 0;
3127
3128         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3129         open->op_recall = 0;
3130         switch (open->op_claim_type) {
3131                 case NFS4_OPEN_CLAIM_PREVIOUS:
3132                         if (!cb_up)
3133                                 open->op_recall = 1;
3134                         if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3135                                 goto out_no_deleg;
3136                         break;
3137                 case NFS4_OPEN_CLAIM_NULL:
3138                 case NFS4_OPEN_CLAIM_FH:
3139                         /*
3140                          * Let's not give out any delegations till everyone's
3141                          * had the chance to reclaim theirs....
3142                          */
3143                         if (locks_in_grace(net))
3144                                 goto out_no_deleg;
3145                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3146                                 goto out_no_deleg;
3147                         /*
3148                          * Also, if the file was opened for write or
3149                          * create, there's a good chance the client's
3150                          * about to write to it, resulting in an
3151                          * immediate recall (since we don't support
3152                          * write delegations):
3153                          */
3154                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3155                                 goto out_no_deleg;
3156                         if (open->op_create == NFS4_OPEN_CREATE)
3157                                 goto out_no_deleg;
3158                         break;
3159                 default:
3160                         goto out_no_deleg;
3161         }
3162         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
3163         if (dp == NULL)
3164                 goto out_no_deleg;
3165         status = nfs4_set_delegation(dp, stp->st_file);
3166         if (status)
3167                 goto out_free;
3168
3169         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3170
3171         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3172                 STATEID_VAL(&dp->dl_stid.sc_stateid));
3173         open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3174         return;
3175 out_free:
3176         remove_stid(&dp->dl_stid);
3177         nfs4_put_delegation(dp);
3178 out_no_deleg:
3179         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3180         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3181             open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3182                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3183                 open->op_recall = 1;
3184         }
3185
3186         /* 4.1 client asking for a delegation? */
3187         if (open->op_deleg_want)
3188                 nfsd4_open_deleg_none_ext(open, status);
3189         return;
3190 }
3191
3192 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3193                                         struct nfs4_delegation *dp)
3194 {
3195         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3196             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3197                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3198                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3199         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3200                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3201                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3202                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3203         }
3204         /* Otherwise the client must be confused wanting a delegation
3205          * it already has, therefore we don't return
3206          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3207          */
3208 }
3209
3210 /*
3211  * called with nfs4_lock_state() held.
3212  */
3213 __be32
3214 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3215 {
3216         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3217         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3218         struct nfs4_file *fp = NULL;
3219         struct inode *ino = current_fh->fh_dentry->d_inode;
3220         struct nfs4_ol_stateid *stp = NULL;
3221         struct nfs4_delegation *dp = NULL;
3222         __be32 status;
3223
3224         /*
3225          * Lookup file; if found, lookup stateid and check open request,
3226          * and check for delegations in the process of being recalled.
3227          * If not found, create the nfs4_file struct
3228          */
3229         fp = find_file(ino);
3230         if (fp) {
3231                 if ((status = nfs4_check_open(fp, open, &stp)))
3232                         goto out;
3233                 status = nfs4_check_deleg(cl, open, &dp);
3234                 if (status)
3235                         goto out;
3236         } else {
3237                 status = nfserr_bad_stateid;
3238                 if (nfsd4_is_deleg_cur(open))
3239                         goto out;
3240                 status = nfserr_jukebox;
3241                 fp = open->op_file;
3242                 open->op_file = NULL;
3243                 nfsd4_init_file(fp, ino);
3244         }
3245
3246         /*
3247          * OPEN the file, or upgrade an existing OPEN.
3248          * If truncate fails, the OPEN fails.
3249          */
3250         if (stp) {
3251                 /* Stateid was found, this is an OPEN upgrade */
3252                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3253                 if (status)
3254                         goto out;
3255         } else {
3256                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3257                 if (status)
3258                         goto out;
3259                 status = nfsd4_truncate(rqstp, current_fh, open);
3260                 if (status)
3261                         goto out;
3262                 stp = open->op_stp;
3263                 open->op_stp = NULL;
3264                 init_open_stateid(stp, fp, open);
3265         }
3266         update_stateid(&stp->st_stid.sc_stateid);
3267         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3268
3269         if (nfsd4_has_session(&resp->cstate)) {
3270                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3271
3272                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3273                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3274                         open->op_why_no_deleg = WND4_NOT_WANTED;
3275                         goto nodeleg;
3276                 }
3277         }
3278
3279         /*
3280         * Attempt to hand out a delegation. No error return, because the
3281         * OPEN succeeds even if we fail.
3282         */
3283         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3284 nodeleg:
3285         status = nfs_ok;
3286
3287         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3288                 STATEID_VAL(&stp->st_stid.sc_stateid));
3289 out:
3290         /* 4.1 client trying to upgrade/downgrade delegation? */
3291         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3292             open->op_deleg_want)
3293                 nfsd4_deleg_xgrade_none_ext(open, dp);
3294
3295         if (fp)
3296                 put_nfs4_file(fp);
3297         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3298                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3299         /*
3300         * To finish the open response, we just need to set the rflags.
3301         */
3302         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3303         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3304             !nfsd4_has_session(&resp->cstate))
3305                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3306
3307         return status;
3308 }
3309
3310 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3311 {
3312         if (open->op_openowner) {
3313                 struct nfs4_openowner *oo = open->op_openowner;
3314
3315                 if (!list_empty(&oo->oo_owner.so_stateids))
3316                         list_del_init(&oo->oo_close_lru);
3317                 if (oo->oo_flags & NFS4_OO_NEW) {
3318                         if (status) {
3319                                 release_openowner(oo);
3320                                 open->op_openowner = NULL;
3321                         } else
3322                                 oo->oo_flags &= ~NFS4_OO_NEW;
3323                 }
3324         }
3325         if (open->op_file)
3326                 nfsd4_free_file(open->op_file);
3327         if (open->op_stp)
3328                 free_generic_stateid(open->op_stp);
3329 }
3330
3331 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
3332 {
3333         struct nfs4_client *found;
3334
3335         if (STALE_CLIENTID(clid, nn))
3336                 return nfserr_stale_clientid;
3337         found = find_confirmed_client(clid, session, nn);
3338         if (clp)
3339                 *clp = found;
3340         return found ? nfs_ok : nfserr_expired;
3341 }
3342
3343 __be32
3344 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3345             clientid_t *clid)
3346 {
3347         struct nfs4_client *clp;
3348         __be32 status;
3349         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3350
3351         nfs4_lock_state();
3352         dprintk("process_renew(%08x/%08x): starting\n",
3353                         clid->cl_boot, clid->cl_id);
3354         status = lookup_clientid(clid, cstate->minorversion, nn, &clp);
3355         if (status)
3356                 goto out;
3357         status = nfserr_cb_path_down;
3358         if (!list_empty(&clp->cl_delegations)
3359                         && clp->cl_cb_state != NFSD4_CB_UP)
3360                 goto out;
3361         status = nfs_ok;
3362 out:
3363         nfs4_unlock_state();
3364         return status;
3365 }
3366
3367 static void
3368 nfsd4_end_grace(struct nfsd_net *nn)
3369 {
3370         /* do nothing if grace period already ended */
3371         if (nn->grace_ended)
3372                 return;
3373
3374         dprintk("NFSD: end of grace period\n");
3375         nn->grace_ended = true;
3376         nfsd4_record_grace_done(nn, nn->boot_time);
3377         locks_end_grace(&nn->nfsd4_manager);
3378         /*
3379          * Now that every NFSv4 client has had the chance to recover and
3380          * to see the (possibly new, possibly shorter) lease time, we
3381          * can safely set the next grace time to the current lease time:
3382          */
3383         nn->nfsd4_grace = nn->nfsd4_lease;
3384 }
3385
3386 static time_t
3387 nfs4_laundromat(struct nfsd_net *nn)
3388 {
3389         struct nfs4_client *clp;
3390         struct nfs4_openowner *oo;
3391         struct nfs4_delegation *dp;
3392         struct list_head *pos, *next, reaplist;
3393         time_t cutoff = get_seconds() - nn->nfsd4_lease;
3394         time_t t, clientid_val = nn->nfsd4_lease;
3395         time_t u, test_val = nn->nfsd4_lease;
3396
3397         nfs4_lock_state();
3398
3399         dprintk("NFSD: laundromat service - starting\n");
3400         nfsd4_end_grace(nn);
3401         INIT_LIST_HEAD(&reaplist);
3402         spin_lock(&nn->client_lock);
3403         list_for_each_safe(pos, next, &nn->client_lru) {
3404                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3405                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3406                         t = clp->cl_time - cutoff;
3407                         if (clientid_val > t)
3408                                 clientid_val = t;
3409                         break;
3410                 }
3411                 if (mark_client_expired_locked(clp)) {
3412                         dprintk("NFSD: client in use (clientid %08x)\n",
3413                                 clp->cl_clientid.cl_id);
3414                         continue;
3415                 }
3416                 list_move(&clp->cl_lru, &reaplist);
3417         }
3418         spin_unlock(&nn->client_lock);
3419         list_for_each_safe(pos, next, &reaplist) {
3420                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3421                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3422                         clp->cl_clientid.cl_id);
3423                 expire_client(clp);
3424         }
3425         spin_lock(&recall_lock);
3426         list_for_each_safe(pos, next, &nn->del_recall_lru) {
3427                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3428                 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
3429                         continue;
3430                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3431                         u = dp->dl_time - cutoff;
3432                         if (test_val > u)
3433                                 test_val = u;
3434                         break;
3435                 }
3436                 list_move(&dp->dl_recall_lru, &reaplist);
3437         }
3438         spin_unlock(&recall_lock);
3439         list_for_each_safe(pos, next, &reaplist) {
3440                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3441                 revoke_delegation(dp);
3442         }
3443         test_val = nn->nfsd4_lease;
3444         list_for_each_safe(pos, next, &nn->close_lru) {
3445                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3446                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3447                         u = oo->oo_time - cutoff;
3448                         if (test_val > u)
3449                                 test_val = u;
3450                         break;
3451                 }
3452                 release_openowner(oo);
3453         }
3454         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3455                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3456         nfs4_unlock_state();
3457         return clientid_val;
3458 }
3459
3460 static struct workqueue_struct *laundry_wq;
3461 static void laundromat_main(struct work_struct *);
3462
3463 static void
3464 laundromat_main(struct work_struct *laundry)
3465 {
3466         time_t t;
3467         struct delayed_work *dwork = container_of(laundry, struct delayed_work,
3468                                                   work);
3469         struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
3470                                            laundromat_work);
3471
3472         t = nfs4_laundromat(nn);
3473         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3474         queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
3475 }
3476
3477 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3478 {
3479         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3480                 return nfserr_bad_stateid;
3481         return nfs_ok;
3482 }
3483
3484 static inline int
3485 access_permit_read(struct nfs4_ol_stateid *stp)
3486 {
3487         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3488                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3489                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3490 }
3491
3492 static inline int
3493 access_permit_write(struct nfs4_ol_stateid *stp)
3494 {
3495         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3496                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3497 }
3498
3499 static
3500 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3501 {
3502         __be32 status = nfserr_openmode;
3503
3504         /* For lock stateid's, we test the parent open, not the lock: */
3505         if (stp->st_openstp)
3506                 stp = stp->st_openstp;
3507         if ((flags & WR_STATE) && !access_permit_write(stp))
3508                 goto out;
3509         if ((flags & RD_STATE) && !access_permit_read(stp))
3510                 goto out;
3511         status = nfs_ok;
3512 out:
3513         return status;
3514 }
3515
3516 static inline __be32
3517 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3518 {
3519         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3520                 return nfs_ok;
3521         else if (locks_in_grace(net)) {
3522                 /* Answer in remaining cases depends on existence of
3523                  * conflicting state; so we must wait out the grace period. */
3524                 return nfserr_grace;
3525         } else if (flags & WR_STATE)
3526                 return nfs4_share_conflict(current_fh,
3527                                 NFS4_SHARE_DENY_WRITE);
3528         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3529                 return nfs4_share_conflict(current_fh,
3530                                 NFS4_SHARE_DENY_READ);
3531 }
3532
3533 /*
3534  * Allow READ/WRITE during grace period on recovered state only for files
3535  * that are not able to provide mandatory locking.
3536  */
3537 static inline int
3538 grace_disallows_io(struct net *net, struct inode *inode)
3539 {
3540         return locks_in_grace(net) && mandatory_lock(inode);
3541 }
3542
3543 /* Returns true iff a is later than b: */
3544 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3545 {
3546         return (s32)(a->si_generation - b->si_generation) > 0;
3547 }
3548
3549 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3550 {
3551         /*
3552          * When sessions are used the stateid generation number is ignored
3553          * when it is zero.
3554          */
3555         if (has_session && in->si_generation == 0)
3556                 return nfs_ok;
3557
3558         if (in->si_generation == ref->si_generation)
3559                 return nfs_ok;
3560
3561         /* If the client sends us a stateid from the future, it's buggy: */
3562         if (stateid_generation_after(in, ref))
3563                 return nfserr_bad_stateid;
3564         /*
3565          * However, we could see a stateid from the past, even from a
3566          * non-buggy client.  For example, if the client sends a lock
3567          * while some IO is outstanding, the lock may bump si_generation
3568          * while the IO is still in flight.  The client could avoid that
3569          * situation by waiting for responses on all the IO requests,
3570          * but better performance may result in retrying IO that
3571          * receives an old_stateid error if requests are rarely
3572          * reordered in flight:
3573          */
3574         return nfserr_old_stateid;
3575 }
3576
3577 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3578 {
3579         struct nfs4_stid *s;
3580         struct nfs4_ol_stateid *ols;
3581         __be32 status;
3582
3583         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3584                 return nfserr_bad_stateid;
3585         /* Client debugging aid. */
3586         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3587                 char addr_str[INET6_ADDRSTRLEN];
3588                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3589                                  sizeof(addr_str));
3590                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3591                                         "with incorrect client ID\n", addr_str);
3592                 return nfserr_bad_stateid;
3593         }
3594         s = find_stateid(cl, stateid);
3595         if (!s)
3596                 return nfserr_bad_stateid;
3597         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3598         if (status)
3599                 return status;
3600         switch (s->sc_type) {
3601         case NFS4_DELEG_STID:
3602                 return nfs_ok;
3603         case NFS4_REVOKED_DELEG_STID:
3604                 return nfserr_deleg_revoked;
3605         case NFS4_OPEN_STID:
3606         case NFS4_LOCK_STID:
3607                 ols = openlockstateid(s);
3608                 if (ols->st_stateowner->so_is_open_owner
3609                                 && !(openowner(ols->st_stateowner)->oo_flags
3610                                                 & NFS4_OO_CONFIRMED))
3611                         return nfserr_bad_stateid;
3612                 return nfs_ok;
3613         default:
3614                 printk("unknown stateid type %x\n", s->sc_type);
3615         case NFS4_CLOSED_STID:
3616                 return nfserr_bad_stateid;
3617         }
3618 }
3619
3620 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,
3621                                    struct nfs4_stid **s, bool sessions,
3622                                    struct nfsd_net *nn)
3623 {
3624         struct nfs4_client *cl;
3625         __be32 status;
3626
3627         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3628                 return nfserr_bad_stateid;
3629         status = lookup_clientid(&stateid->si_opaque.so_clid, sessions,
3630                                                         nn, &cl);
3631         if (status == nfserr_stale_clientid) {
3632                 if (sessions)
3633                         return nfserr_bad_stateid;
3634                 return nfserr_stale_stateid;
3635         }
3636         if (status)
3637                 return status;
3638         *s = find_stateid_by_type(cl, stateid, typemask);
3639         if (!*s)
3640                 return nfserr_bad_stateid;
3641         return nfs_ok;
3642 }
3643
3644 /*
3645 * Checks for stateid operations
3646 */
3647 __be32
3648 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3649                            stateid_t *stateid, int flags, struct file **filpp)
3650 {
3651         struct nfs4_stid *s;
3652         struct nfs4_ol_stateid *stp = NULL;
3653         struct nfs4_delegation *dp = NULL;
3654         struct svc_fh *current_fh = &cstate->current_fh;
3655         struct inode *ino = current_fh->fh_dentry->d_inode;
3656         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3657         __be32 status;
3658
3659         if (filpp)
3660                 *filpp = NULL;
3661
3662         if (grace_disallows_io(net, ino))
3663                 return nfserr_grace;
3664
3665         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3666                 return check_special_stateids(net, current_fh, stateid, flags);
3667
3668         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
3669                                       &s, cstate->minorversion, nn);
3670         if (status)
3671                 return status;
3672         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3673         if (status)
3674                 goto out;
3675         switch (s->sc_type) {
3676         case NFS4_DELEG_STID:
3677                 dp = delegstateid(s);
3678                 status = nfs4_check_delegmode(dp, flags);
3679                 if (status)
3680                         goto out;
3681                 if (filpp) {
3682                         *filpp = dp->dl_file->fi_deleg_file;
3683                         if (!*filpp) {
3684                                 WARN_ON_ONCE(1);
3685                                 status = nfserr_serverfault;
3686                                 goto out;
3687                         }
3688                 }
3689                 break;
3690         case NFS4_OPEN_STID:
3691         case NFS4_LOCK_STID:
3692                 stp = openlockstateid(s);
3693                 status = nfs4_check_fh(current_fh, stp);
3694                 if (status)
3695                         goto out;
3696                 if (stp->st_stateowner->so_is_open_owner
3697                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3698                         goto out;
3699                 status = nfs4_check_openmode(stp, flags);
3700                 if (status)
3701                         goto out;
3702                 if (filpp) {
3703                         if (flags & RD_STATE)
3704                                 *filpp = find_readable_file(stp->st_file);
3705                         else
3706                                 *filpp = find_writeable_file(stp->st_file);
3707                 }
3708                 break;
3709         default:
3710                 return nfserr_bad_stateid;
3711         }
3712         status = nfs_ok;
3713 out:
3714         return status;
3715 }
3716
3717 static __be32
3718 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3719 {
3720         if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3721                 return nfserr_locks_held;
3722         release_lock_stateid(stp);
3723         return nfs_ok;
3724 }
3725
3726 /*
3727  * Test if the stateid is valid
3728  */
3729 __be32
3730 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3731                    struct nfsd4_test_stateid *test_stateid)
3732 {
3733         struct nfsd4_test_stateid_id *stateid;
3734         struct nfs4_client *cl = cstate->session->se_client;
3735
3736         nfs4_lock_state();
3737         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3738                 stateid->ts_id_status =
3739                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3740         nfs4_unlock_state();
3741
3742         return nfs_ok;
3743 }
3744
3745 __be32
3746 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3747                    struct nfsd4_free_stateid *free_stateid)
3748 {
3749         stateid_t *stateid = &free_stateid->fr_stateid;
3750         struct nfs4_stid *s;
3751         struct nfs4_delegation *dp;
3752         struct nfs4_client *cl = cstate->session->se_client;
3753         __be32 ret = nfserr_bad_stateid;
3754
3755         nfs4_lock_state();
3756         s = find_stateid(cl, stateid);
3757         if (!s)
3758                 goto out;
3759         switch (s->sc_type) {
3760         case NFS4_DELEG_STID:
3761                 ret = nfserr_locks_held;
3762                 goto out;
3763         case NFS4_OPEN_STID:
3764         case NFS4_LOCK_STID:
3765                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3766                 if (ret)
3767                         goto out;
3768                 if (s->sc_type == NFS4_LOCK_STID)
3769                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3770                 else
3771                         ret = nfserr_locks_held;
3772                 break;
3773         case NFS4_REVOKED_DELEG_STID:
3774                 dp = delegstateid(s);
3775                 destroy_revoked_delegation(dp);
3776                 ret = nfs_ok;
3777                 break;
3778         default:
3779                 ret = nfserr_bad_stateid;
3780         }
3781 out:
3782         nfs4_unlock_state();
3783         return ret;
3784 }
3785
3786 static inline int
3787 setlkflg (int type)
3788 {
3789         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3790                 RD_STATE : WR_STATE;
3791 }
3792
3793 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3794 {
3795         struct svc_fh *current_fh = &cstate->current_fh;
3796         struct nfs4_stateowner *sop = stp->st_stateowner;
3797         __be32 status;
3798
3799         status = nfsd4_check_seqid(cstate, sop, seqid);
3800         if (status)
3801                 return status;
3802         if (stp->st_stid.sc_type == NFS4_CLOSED_STID
3803                 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
3804                 /*
3805                  * "Closed" stateid's exist *only* to return
3806                  * nfserr_replay_me from the previous step, and
3807                  * revoked delegations are kept only for free_stateid.
3808                  */
3809                 return nfserr_bad_stateid;
3810         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3811         if (status)
3812                 return status;
3813         return nfs4_check_fh(current_fh, stp);
3814 }
3815
3816 /*
3817  * Checks for sequence id mutating operations.
3818  */
3819 static __be32
3820 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3821                          stateid_t *stateid, char typemask,
3822                          struct nfs4_ol_stateid **stpp,
3823                          struct nfsd_net *nn)
3824 {
3825         __be32 status;
3826         struct nfs4_stid *s;
3827
3828         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3829                 seqid, STATEID_VAL(stateid));
3830
3831         *stpp = NULL;
3832         status = nfsd4_lookup_stateid(stateid, typemask, &s,
3833                                       cstate->minorversion, nn);
3834         if (status)
3835                 return status;
3836         *stpp = openlockstateid(s);
3837         if (!nfsd4_has_session(cstate))
3838                 cstate->replay_owner = (*stpp)->st_stateowner;
3839
3840         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3841 }
3842
3843 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3844                                                  stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
3845 {
3846         __be32 status;
3847         struct nfs4_openowner *oo;
3848
3849         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3850                                                 NFS4_OPEN_STID, stpp, nn);
3851         if (status)
3852                 return status;
3853         oo = openowner((*stpp)->st_stateowner);
3854         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3855                 return nfserr_bad_stateid;
3856         return nfs_ok;
3857 }
3858
3859 __be32
3860 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3861                    struct nfsd4_open_confirm *oc)
3862 {
3863         __be32 status;
3864         struct nfs4_openowner *oo;
3865         struct nfs4_ol_stateid *stp;
3866         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3867
3868         dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
3869                         cstate->current_fh.fh_dentry);
3870
3871         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3872         if (status)
3873                 return status;
3874
3875         nfs4_lock_state();
3876
3877         status = nfs4_preprocess_seqid_op(cstate,
3878                                         oc->oc_seqid, &oc->oc_req_stateid,
3879                                         NFS4_OPEN_STID, &stp, nn);
3880         if (status)
3881                 goto out;
3882         oo = openowner(stp->st_stateowner);
3883         status = nfserr_bad_stateid;
3884         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3885                 goto out;
3886         oo->oo_flags |= NFS4_OO_CONFIRMED;
3887         update_stateid(&stp->st_stid.sc_stateid);
3888         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3889         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3890                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3891
3892         nfsd4_client_record_create(oo->oo_owner.so_client);
3893         status = nfs_ok;
3894 out:
3895         nfsd4_bump_seqid(cstate, status);
3896         if (!cstate->replay_owner)
3897                 nfs4_unlock_state();
3898         return status;
3899 }
3900
3901 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3902 {
3903         if (!test_access(access, stp))
3904                 return;
3905         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3906         clear_access(access, stp);
3907 }
3908
3909 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3910 {
3911         switch (to_access) {
3912         case NFS4_SHARE_ACCESS_READ:
3913                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3914                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3915                 break;
3916         case NFS4_SHARE_ACCESS_WRITE:
3917                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3918                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3919                 break;
3920         case NFS4_SHARE_ACCESS_BOTH:
3921                 break;
3922         default:
3923                 WARN_ON_ONCE(1);
3924         }
3925 }
3926
3927 static void
3928 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3929 {
3930         int i;
3931         for (i = 0; i < 4; i++) {
3932                 if ((i & deny) != i)
3933                         clear_deny(i, stp);
3934         }
3935 }
3936
3937 __be32
3938 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3939                      struct nfsd4_compound_state *cstate,
3940                      struct nfsd4_open_downgrade *od)
3941 {
3942         __be32 status;
3943         struct nfs4_ol_stateid *stp;
3944         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3945
3946         dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
3947                         cstate->current_fh.fh_dentry);
3948
3949         /* We don't yet support WANT bits: */
3950         if (od->od_deleg_want)
3951                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3952                         od->od_deleg_want);
3953
3954         nfs4_lock_state();
3955         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3956                                         &od->od_stateid, &stp, nn);
3957         if (status)
3958                 goto out;
3959         status = nfserr_inval;
3960         if (!test_access(od->od_share_access, stp)) {
3961                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3962                         stp->st_access_bmap, od->od_share_access);
3963                 goto out;
3964         }
3965         if (!test_deny(od->od_share_deny, stp)) {
3966                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3967                         stp->st_deny_bmap, od->od_share_deny);
3968                 goto out;
3969         }
3970         nfs4_stateid_downgrade(stp, od->od_share_access);
3971
3972         reset_union_bmap_deny(od->od_share_deny, stp);
3973
3974         update_stateid(&stp->st_stid.sc_stateid);
3975         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3976         status = nfs_ok;
3977 out:
3978         nfsd4_bump_seqid(cstate, status);
3979         if (!cstate->replay_owner)
3980                 nfs4_unlock_state();
3981         return status;
3982 }
3983
3984 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3985 {
3986         unhash_open_stateid(s);
3987         s->st_stid.sc_type = NFS4_CLOSED_STID;
3988 }
3989
3990 /*
3991  * nfs4_unlock_state() called after encode
3992  */
3993 __be32
3994 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3995             struct nfsd4_close *close)
3996 {
3997         __be32 status;
3998         struct nfs4_openowner *oo;
3999         struct nfs4_ol_stateid *stp;
4000         struct net *net = SVC_NET(rqstp);
4001         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4002
4003         dprintk("NFSD: nfsd4_close on file %pd\n",
4004                         cstate->current_fh.fh_dentry);
4005
4006         nfs4_lock_state();
4007         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4008                                         &close->cl_stateid,
4009                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
4010                                         &stp, nn);
4011         nfsd4_bump_seqid(cstate, status);
4012         if (status)
4013                 goto out;
4014         oo = openowner(stp->st_stateowner);
4015         update_stateid(&stp->st_stid.sc_stateid);
4016         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4017
4018         nfsd4_close_open_stateid(stp);
4019
4020         if (cstate->minorversion)
4021                 free_generic_stateid(stp);
4022         else
4023                 oo->oo_last_closed_stid = stp;
4024
4025         if (list_empty(&oo->oo_owner.so_stateids)) {
4026                 if (cstate->minorversion)
4027                         release_openowner(oo);
4028                 else {
4029                         /*
4030                          * In the 4.0 case we need to keep the owners around a
4031                          * little while to handle CLOSE replay.
4032                          */
4033                         move_to_close_lru(oo, SVC_NET(rqstp));
4034                 }
4035         }
4036 out:
4037         if (!cstate->replay_owner)
4038                 nfs4_unlock_state();
4039         return status;
4040 }
4041
4042 __be32
4043 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4044                   struct nfsd4_delegreturn *dr)
4045 {
4046         struct nfs4_delegation *dp;
4047         stateid_t *stateid = &dr->dr_stateid;
4048         struct nfs4_stid *s;
4049         __be32 status;
4050         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4051
4052         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4053                 return status;
4054
4055         nfs4_lock_state();
4056         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s,
4057                                       cstate->minorversion, nn);
4058         if (status)
4059                 goto out;
4060         dp = delegstateid(s);
4061         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4062         if (status)
4063                 goto out;
4064
4065         destroy_delegation(dp);
4066 out:
4067         nfs4_unlock_state();
4068
4069         return status;
4070 }
4071
4072
4073 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
4074
4075 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
4076
4077 static inline u64
4078 end_offset(u64 start, u64 len)
4079 {
4080         u64 end;
4081
4082         end = start + len;
4083         return end >= start ? end: NFS4_MAX_UINT64;
4084 }
4085
4086 /* last octet in a range */
4087 static inline u64
4088 last_byte_offset(u64 start, u64 len)
4089 {
4090         u64 end;
4091
4092         WARN_ON_ONCE(!len);
4093         end = start + len;
4094         return end > start ? end - 1: NFS4_MAX_UINT64;
4095 }
4096
4097 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
4098 {
4099         return (file_hashval(inode) + cl_id
4100                         + opaque_hashval(ownername->data, ownername->len))
4101                 & LOCKOWNER_INO_HASH_MASK;
4102 }
4103
4104 /*
4105  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4106  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4107  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
4108  * locking, this prevents us from being completely protocol-compliant.  The
4109  * real solution to this problem is to start using unsigned file offsets in
4110  * the VFS, but this is a very deep change!
4111  */
4112 static inline void
4113 nfs4_transform_lock_offset(struct file_lock *lock)
4114 {
4115         if (lock->fl_start < 0)
4116                 lock->fl_start = OFFSET_MAX;
4117         if (lock->fl_end < 0)
4118                 lock->fl_end = OFFSET_MAX;
4119 }
4120
4121 /* Hack!: For now, we're defining this just so we can use a pointer to it
4122  * as a unique cookie to identify our (NFSv4's) posix locks. */
4123 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
4124 };
4125
4126 static inline void
4127 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4128 {
4129         struct nfs4_lockowner *lo;
4130
4131         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4132                 lo = (struct nfs4_lockowner *) fl->fl_owner;
4133                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4134                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
4135                 if (!deny->ld_owner.data)
4136                         /* We just don't care that much */
4137                         goto nevermind;
4138                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4139                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4140         } else {
4141 nevermind:
4142                 deny->ld_owner.len = 0;
4143                 deny->ld_owner.data = NULL;
4144                 deny->ld_clientid.cl_boot = 0;
4145                 deny->ld_clientid.cl_id = 0;
4146         }
4147         deny->ld_start = fl->fl_start;
4148         deny->ld_length = NFS4_MAX_UINT64;
4149         if (fl->fl_end != NFS4_MAX_UINT64)
4150                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
4151         deny->ld_type = NFS4_READ_LT;
4152         if (fl->fl_type != F_RDLCK)
4153                 deny->ld_type = NFS4_WRITE_LT;
4154 }
4155
4156 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
4157 {
4158         struct nfs4_ol_stateid *lst;
4159
4160         if (!same_owner_str(&lo->lo_owner, owner, clid))
4161                 return false;
4162         lst = list_first_entry(&lo->lo_owner.so_stateids,
4163                                struct nfs4_ol_stateid, st_perstateowner);
4164         return lst->st_file->fi_inode == inode;
4165 }
4166
4167 static struct nfs4_lockowner *
4168 find_lockowner_str(struct inode *inode, clientid_t *clid,
4169                    struct xdr_netobj *owner, struct nfsd_net *nn)
4170 {
4171         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
4172         struct nfs4_lockowner *lo;
4173
4174         list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
4175                 if (same_lockowner_ino(lo, inode, clid, owner))
4176                         return lo;
4177         }
4178         return NULL;
4179 }
4180
4181 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
4182 {
4183         struct inode *inode = open_stp->st_file->fi_inode;
4184         unsigned int inohash = lockowner_ino_hashval(inode,
4185                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
4186         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
4187
4188         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
4189         list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
4190         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
4191 }
4192
4193 /*
4194  * Alloc a lock owner structure.
4195  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
4196  * occurred.
4197  *
4198  * strhashval = ownerstr_hashval
4199  */
4200
4201 static struct nfs4_lockowner *
4202 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
4203         struct nfs4_lockowner *lo;
4204
4205         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4206         if (!lo)
4207                 return NULL;
4208         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4209         lo->lo_owner.so_is_open_owner = 0;
4210         /* It is the openowner seqid that will be incremented in encode in the
4211          * case of new lockowners; so increment the lock seqid manually: */
4212         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4213         hash_lockowner(lo, strhashval, clp, open_stp);
4214         return lo;
4215 }
4216
4217 static struct nfs4_ol_stateid *
4218 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4219 {
4220         struct nfs4_ol_stateid *stp;
4221         struct nfs4_client *clp = lo->lo_owner.so_client;
4222
4223         stp = nfs4_alloc_stateid(clp);
4224         if (stp == NULL)
4225                 return NULL;
4226         stp->st_stid.sc_type = NFS4_LOCK_STID;
4227         list_add(&stp->st_perfile, &fp->fi_stateids);
4228         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4229         stp->st_stateowner = &lo->lo_owner;
4230         get_nfs4_file(fp);
4231         stp->st_file = fp;
4232         stp->st_access_bmap = 0;
4233         stp->st_deny_bmap = open_stp->st_deny_bmap;
4234         stp->st_openstp = open_stp;
4235         return stp;
4236 }
4237
4238 static int
4239 check_lock_length(u64 offset, u64 length)
4240 {
4241         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4242              LOFF_OVERFLOW(offset, length)));
4243 }
4244
4245 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4246 {
4247         struct nfs4_file *fp = lock_stp->st_file;
4248         int oflag = nfs4_access_to_omode(access);
4249
4250         if (test_access(access, lock_stp))
4251                 return;
4252         nfs4_file_get_access(fp, oflag);
4253         set_access(access, lock_stp);
4254 }
4255
4256 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)
4257 {
4258         struct nfs4_file *fi = ost->st_file;
4259         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4260         struct nfs4_client *cl = oo->oo_owner.so_client;
4261         struct nfs4_lockowner *lo;
4262         unsigned int strhashval;
4263         struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
4264
4265         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
4266                                 &lock->v.new.owner, nn);
4267         if (lo) {
4268                 if (!cstate->minorversion)
4269                         return nfserr_bad_seqid;
4270                 /* XXX: a lockowner always has exactly one stateid: */
4271                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4272                                 struct nfs4_ol_stateid, st_perstateowner);
4273                 return nfs_ok;
4274         }
4275         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4276                         &lock->v.new.owner);
4277         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4278         if (lo == NULL)
4279                 return nfserr_jukebox;
4280         *lst = alloc_init_lock_stateid(lo, fi, ost);
4281         if (*lst == NULL) {
4282                 release_lockowner(lo);
4283                 return nfserr_jukebox;
4284         }
4285         *new = true;
4286         return nfs_ok;
4287 }
4288
4289 /*
4290  *  LOCK operation
4291  */
4292 __be32
4293 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4294            struct nfsd4_lock *lock)
4295 {
4296         struct nfs4_openowner *open_sop = NULL;
4297         struct nfs4_lockowner *lock_sop = NULL;
4298         struct nfs4_ol_stateid *lock_stp;
4299         struct file *filp = NULL;
4300         struct file_lock *file_lock = NULL;
4301         struct file_lock *conflock = NULL;
4302         __be32 status = 0;
4303         bool new_state = false;
4304         int lkflg;
4305         int err;
4306         struct net *net = SVC_NET(rqstp);
4307         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4308
4309         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4310                 (long long) lock->lk_offset,
4311                 (long long) lock->lk_length);
4312
4313         if (check_lock_length(lock->lk_offset, lock->lk_length))
4314                  return nfserr_inval;
4315
4316         if ((status = fh_verify(rqstp, &cstate->current_fh,
4317                                 S_IFREG, NFSD_MAY_LOCK))) {
4318                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4319                 return status;
4320         }
4321
4322         nfs4_lock_state();
4323
4324         if (lock->lk_is_new) {
4325                 struct nfs4_ol_stateid *open_stp = NULL;
4326
4327                 if (nfsd4_has_session(cstate))
4328                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4329                         memcpy(&lock->v.new.clientid,
4330                                 &cstate->session->se_client->cl_clientid,
4331                                 sizeof(clientid_t));
4332
4333                 status = nfserr_stale_clientid;
4334                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4335                         goto out;
4336
4337                 /* validate and update open stateid and open seqid */
4338                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4339                                         lock->lk_new_open_seqid,
4340                                         &lock->lk_new_open_stateid,
4341                                         &open_stp, nn);
4342                 if (status)
4343                         goto out;
4344                 open_sop = openowner(open_stp->st_stateowner);
4345                 status = nfserr_bad_stateid;
4346                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4347                                                 &lock->v.new.clientid))
4348                         goto out;
4349                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4350                                                         &lock_stp, &new_state);
4351         } else
4352                 status = nfs4_preprocess_seqid_op(cstate,
4353                                        lock->lk_old_lock_seqid,
4354                                        &lock->lk_old_lock_stateid,
4355                                        NFS4_LOCK_STID, &lock_stp, nn);
4356         if (status)
4357                 goto out;
4358         lock_sop = lockowner(lock_stp->st_stateowner);
4359
4360         lkflg = setlkflg(lock->lk_type);
4361         status = nfs4_check_openmode(lock_stp, lkflg);
4362         if (status)
4363                 goto out;
4364
4365         status = nfserr_grace;
4366         if (locks_in_grace(net) && !lock->lk_reclaim)
4367                 goto out;
4368         status = nfserr_no_grace;
4369         if (!locks_in_grace(net) && lock->lk_reclaim)
4370                 goto out;
4371
4372         file_lock = locks_alloc_lock();
4373         if (!file_lock) {
4374                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4375                 status = nfserr_jukebox;
4376                 goto out;
4377         }
4378
4379         locks_init_lock(file_lock);
4380         switch (lock->lk_type) {
4381                 case NFS4_READ_LT:
4382                 case NFS4_READW_LT:
4383                         filp = find_readable_file(lock_stp->st_file);
4384                         if (filp)
4385                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4386                         file_lock->fl_type = F_RDLCK;
4387                         break;
4388                 case NFS4_WRITE_LT:
4389                 case NFS4_WRITEW_LT:
4390                         filp = find_writeable_file(lock_stp->st_file);
4391                         if (filp)
4392                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4393                         file_lock->fl_type = F_WRLCK;
4394                         break;
4395                 default:
4396                         status = nfserr_inval;
4397                 goto out;
4398         }
4399         if (!filp) {
4400                 status = nfserr_openmode;
4401                 goto out;
4402         }
4403         file_lock->fl_owner = (fl_owner_t)lock_sop;
4404         file_lock->fl_pid = current->tgid;
4405         file_lock->fl_file = filp;
4406         file_lock->fl_flags = FL_POSIX;
4407         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4408         file_lock->fl_start = lock->lk_offset;
4409         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4410         nfs4_transform_lock_offset(file_lock);
4411
4412         conflock = locks_alloc_lock();
4413         if (!conflock) {
4414                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4415                 status = nfserr_jukebox;
4416                 goto out;
4417         }
4418
4419         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4420         switch (-err) {
4421         case 0: /* success! */
4422                 update_stateid(&lock_stp->st_stid.sc_stateid);
4423                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4424                                 sizeof(stateid_t));
4425                 status = 0;
4426                 break;
4427         case (EAGAIN):          /* conflock holds conflicting lock */
4428                 status = nfserr_denied;
4429                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4430                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4431                 break;
4432         case (EDEADLK):
4433                 status = nfserr_deadlock;
4434                 break;
4435         default:
4436                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4437                 status = nfserrno(err);
4438                 break;
4439         }
4440 out:
4441         if (status && new_state)
4442                 release_lockowner(lock_sop);
4443         nfsd4_bump_seqid(cstate, status);
4444         if (!cstate->replay_owner)
4445                 nfs4_unlock_state();
4446         if (file_lock)
4447                 locks_free_lock(file_lock);
4448         if (conflock)
4449                 locks_free_lock(conflock);
4450         return status;
4451 }
4452
4453 /*
4454  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4455  * so we do a temporary open here just to get an open file to pass to
4456  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4457  * inode operation.)
4458  */
4459 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4460 {
4461         struct file *file;
4462         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4463         if (!err) {
4464                 err = nfserrno(vfs_test_lock(file, lock));
4465                 nfsd_close(file);
4466         }
4467         return err;
4468 }
4469
4470 /*
4471  * LOCKT operation
4472  */
4473 __be32
4474 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4475             struct nfsd4_lockt *lockt)
4476 {
4477         struct inode *inode;
4478         struct file_lock *file_lock = NULL;
4479         struct nfs4_lockowner *lo;
4480         __be32 status;
4481         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4482
4483         if (locks_in_grace(SVC_NET(rqstp)))
4484                 return nfserr_grace;
4485
4486         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4487                  return nfserr_inval;
4488
4489         nfs4_lock_state();
4490
4491         if (!nfsd4_has_session(cstate)) {
4492                 status = lookup_clientid(&lockt->lt_clientid, false, nn, NULL);
4493                 if (status)
4494                         goto out;
4495         }
4496
4497         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4498                 goto out;
4499
4500         inode = cstate->current_fh.fh_dentry->d_inode;
4501         file_lock = locks_alloc_lock();
4502         if (!file_lock) {
4503                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4504                 status = nfserr_jukebox;
4505                 goto out;
4506         }
4507         locks_init_lock(file_lock);
4508         switch (lockt->lt_type) {
4509                 case NFS4_READ_LT:
4510                 case NFS4_READW_LT:
4511                         file_lock->fl_type = F_RDLCK;
4512                 break;
4513                 case NFS4_WRITE_LT:
4514                 case NFS4_WRITEW_LT:
4515                         file_lock->fl_type = F_WRLCK;
4516                 break;
4517                 default:
4518                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4519                         status = nfserr_inval;
4520                 goto out;
4521         }
4522
4523         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
4524         if (lo)
4525                 file_lock->fl_owner = (fl_owner_t)lo;
4526         file_lock->fl_pid = current->tgid;
4527         file_lock->fl_flags = FL_POSIX;
4528
4529         file_lock->fl_start = lockt->lt_offset;
4530         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4531
4532         nfs4_transform_lock_offset(file_lock);
4533
4534         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4535         if (status)
4536                 goto out;
4537
4538         if (file_lock->fl_type != F_UNLCK) {
4539                 status = nfserr_denied;
4540                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4541         }
4542 out:
4543         nfs4_unlock_state();
4544         if (file_lock)
4545                 locks_free_lock(file_lock);
4546         return status;
4547 }
4548
4549 __be32
4550 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4551             struct nfsd4_locku *locku)
4552 {
4553         struct nfs4_ol_stateid *stp;
4554         struct file *filp = NULL;
4555         struct file_lock *file_lock = NULL;
4556         __be32 status;
4557         int err;
4558         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4559
4560         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4561                 (long long) locku->lu_offset,
4562                 (long long) locku->lu_length);
4563
4564         if (check_lock_length(locku->lu_offset, locku->lu_length))
4565                  return nfserr_inval;
4566
4567         nfs4_lock_state();
4568
4569         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4570                                         &locku->lu_stateid, NFS4_LOCK_STID,
4571                                         &stp, nn);
4572         if (status)
4573                 goto out;
4574         filp = find_any_file(stp->st_file);
4575         if (!filp) {
4576                 status = nfserr_lock_range;
4577                 goto out;
4578         }
4579         file_lock = locks_alloc_lock();
4580         if (!file_lock) {
4581                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4582                 status = nfserr_jukebox;
4583                 goto out;
4584         }
4585         locks_init_lock(file_lock);
4586         file_lock->fl_type = F_UNLCK;
4587         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4588         file_lock->fl_pid = current->tgid;
4589         file_lock->fl_file = filp;
4590         file_lock->fl_flags = FL_POSIX;
4591         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4592         file_lock->fl_start = locku->lu_offset;
4593
4594         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4595                                                 locku->lu_length);
4596         nfs4_transform_lock_offset(file_lock);
4597
4598         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4599         if (err) {
4600                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4601                 goto out_nfserr;
4602         }
4603         update_stateid(&stp->st_stid.sc_stateid);
4604         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4605
4606 out:
4607         nfsd4_bump_seqid(cstate, status);
4608         if (!cstate->replay_owner)
4609                 nfs4_unlock_state();
4610         if (file_lock)
4611                 locks_free_lock(file_lock);
4612         return status;
4613
4614 out_nfserr:
4615         status = nfserrno(err);
4616         goto out;
4617 }
4618
4619 /*
4620  * returns
4621  *      1: locks held by lockowner
4622  *      0: no locks held by lockowner
4623  */
4624 static int
4625 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4626 {
4627         struct file_lock **flpp;
4628         struct inode *inode = filp->fi_inode;
4629         int status = 0;
4630
4631         spin_lock(&inode->i_lock);
4632         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4633                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4634                         status = 1;
4635                         goto out;
4636                 }
4637         }
4638 out:
4639         spin_unlock(&inode->i_lock);
4640         return status;
4641 }
4642
4643 __be32
4644 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4645                         struct nfsd4_compound_state *cstate,
4646                         struct nfsd4_release_lockowner *rlockowner)
4647 {
4648         clientid_t *clid = &rlockowner->rl_clientid;
4649         struct nfs4_stateowner *sop;
4650         struct nfs4_lockowner *lo;
4651         struct nfs4_ol_stateid *stp;
4652         struct xdr_netobj *owner = &rlockowner->rl_owner;
4653         struct list_head matches;
4654         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4655         __be32 status;
4656         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4657
4658         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4659                 clid->cl_boot, clid->cl_id);
4660
4661         nfs4_lock_state();
4662
4663         status = lookup_clientid(clid, cstate->minorversion, nn, NULL);
4664         if (status)
4665                 goto out;
4666
4667         status = nfserr_locks_held;
4668         INIT_LIST_HEAD(&matches);
4669
4670         list_for_each_entry(sop, &nn->ownerstr_hashtbl[hashval], so_strhash) {
4671                 if (sop->so_is_open_owner)
4672                         continue;
4673                 if (!same_owner_str(sop, owner, clid))
4674                         continue;
4675                 list_for_each_entry(stp, &sop->so_stateids,
4676                                 st_perstateowner) {
4677                         lo = lockowner(sop);
4678                         if (check_for_locks(stp->st_file, lo))
4679                                 goto out;
4680                         list_add(&lo->lo_list, &matches);
4681                 }
4682         }
4683         /* Clients probably won't expect us to return with some (but not all)
4684          * of the lockowner state released; so don't release any until all
4685          * have been checked. */
4686         status = nfs_ok;
4687         while (!list_empty(&matches)) {
4688                 lo = list_entry(matches.next, struct nfs4_lockowner,
4689                                                                 lo_list);
4690                 /* unhash_stateowner deletes so_perclient only
4691                  * for openowners. */
4692                 list_del(&lo->lo_list);
4693                 release_lockowner(lo);
4694         }
4695 out:
4696         nfs4_unlock_state();
4697         return status;
4698 }
4699
4700 static inline struct nfs4_client_reclaim *
4701 alloc_reclaim(void)
4702 {
4703         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4704 }
4705
4706 bool
4707 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4708 {
4709         struct nfs4_client_reclaim *crp;
4710
4711         crp = nfsd4_find_reclaim_client(name, nn);
4712         return (crp && crp->cr_clp);
4713 }
4714
4715 /*
4716  * failure => all reset bets are off, nfserr_no_grace...
4717  */
4718 struct nfs4_client_reclaim *
4719 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4720 {
4721         unsigned int strhashval;
4722         struct nfs4_client_reclaim *crp;
4723
4724         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4725         crp = alloc_reclaim();
4726         if (crp) {
4727                 strhashval = clientstr_hashval(name);
4728                 INIT_LIST_HEAD(&crp->cr_strhash);
4729                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4730                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4731                 crp->cr_clp = NULL;
4732                 nn->reclaim_str_hashtbl_size++;
4733         }
4734         return crp;
4735 }
4736
4737 void
4738 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4739 {
4740         list_del(&crp->cr_strhash);
4741         kfree(crp);
4742         nn->reclaim_str_hashtbl_size--;
4743 }
4744
4745 void
4746 nfs4_release_reclaim(struct nfsd_net *nn)
4747 {
4748         struct nfs4_client_reclaim *crp = NULL;
4749         int i;
4750
4751         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4752                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4753                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4754                                         struct nfs4_client_reclaim, cr_strhash);
4755                         nfs4_remove_reclaim_record(crp, nn);
4756                 }
4757         }
4758         WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
4759 }
4760
4761 /*
4762  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4763 struct nfs4_client_reclaim *
4764 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4765 {
4766         unsigned int strhashval;
4767         struct nfs4_client_reclaim *crp = NULL;
4768
4769         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4770
4771         strhashval = clientstr_hashval(recdir);
4772         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4773                 if (same_name(crp->cr_recdir, recdir)) {
4774                         return crp;
4775                 }
4776         }
4777         return NULL;
4778 }
4779
4780 /*
4781 * Called from OPEN. Look for clientid in reclaim list.
4782 */
4783 __be32
4784 nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
4785 {
4786         struct nfs4_client *clp;
4787
4788         /* find clientid in conf_id_hashtbl */
4789         clp = find_confirmed_client(clid, sessions, nn);
4790         if (clp == NULL)
4791                 return nfserr_reclaim_bad;
4792
4793         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4794 }
4795
4796 #ifdef CONFIG_NFSD_FAULT_INJECTION
4797
4798 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
4799 {
4800         if (mark_client_expired(clp))
4801                 return 0;
4802         expire_client(clp);
4803         return 1;
4804 }
4805
4806 u64 nfsd_print_client(struct nfs4_client *clp, u64 num)
4807 {
4808         char buf[INET6_ADDRSTRLEN];
4809         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4810         printk(KERN_INFO "NFS Client: %s\n", buf);
4811         return 1;
4812 }
4813
4814 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
4815                              const char *type)
4816 {
4817         char buf[INET6_ADDRSTRLEN];
4818         rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
4819         printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
4820 }
4821
4822 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_lockowner *))
4823 {
4824         struct nfs4_openowner *oop;
4825         struct nfs4_lockowner *lop, *lo_next;
4826         struct nfs4_ol_stateid *stp, *st_next;
4827         u64 count = 0;
4828
4829         list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
4830                 list_for_each_entry_safe(stp, st_next, &oop->oo_owner.so_stateids, st_perstateowner) {
4831                         list_for_each_entry_safe(lop, lo_next, &stp->st_lockowners, lo_perstateid) {
4832                                 if (func)
4833                                         func(lop);
4834                                 if (++count == max)
4835                                         return count;
4836                         }
4837                 }
4838         }
4839
4840         return count;
4841 }
4842
4843 u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
4844 {
4845         return nfsd_foreach_client_lock(clp, max, release_lockowner);
4846 }
4847
4848 u64 nfsd_print_client_locks(struct nfs4_client *clp, u64 max)
4849 {
4850         u64 count = nfsd_foreach_client_lock(clp, max, NULL);
4851         nfsd_print_count(clp, count, "locked files");
4852         return count;
4853 }
4854
4855 static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
4856 {
4857         struct nfs4_openowner *oop, *next;
4858         u64 count = 0;
4859
4860         list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
4861                 if (func)
4862                         func(oop);
4863                 if (++count == max)
4864                         break;
4865         }
4866
4867         return count;
4868 }
4869
4870 u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
4871 {
4872         return nfsd_foreach_client_open(clp, max, release_openowner);
4873 }
4874
4875 u64 nfsd_print_client_openowners(struct nfs4_client *clp, u64 max)
4876 {
4877         u64 count = nfsd_foreach_client_open(clp, max, NULL);
4878         nfsd_print_count(clp, count, "open files");
4879         return count;
4880 }
4881
4882 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
4883                                      struct list_head *victims)
4884 {
4885         struct nfs4_delegation *dp, *next;
4886         u64 count = 0;
4887
4888         list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
4889                 if (victims)
4890                         list_move(&dp->dl_recall_lru, victims);
4891                 if (++count == max)
4892                         break;
4893         }
4894         return count;
4895 }
4896
4897 u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
4898 {
4899         struct nfs4_delegation *dp, *next;
4900         LIST_HEAD(victims);
4901         u64 count;
4902
4903         spin_lock(&recall_lock);
4904         count = nfsd_find_all_delegations(clp, max, &victims);
4905         spin_unlock(&recall_lock);
4906
4907         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4908                 revoke_delegation(dp);
4909
4910         return count;
4911 }
4912
4913 u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
4914 {
4915         struct nfs4_delegation *dp, *next;
4916         LIST_HEAD(victims);
4917         u64 count;
4918
4919         spin_lock(&recall_lock);
4920         count = nfsd_find_all_delegations(clp, max, &victims);
4921         list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
4922                 nfsd_break_one_deleg(dp);
4923         spin_unlock(&recall_lock);
4924
4925         return count;
4926 }
4927
4928 u64 nfsd_print_client_delegations(struct nfs4_client *clp, u64 max)
4929 {
4930         u64 count = 0;
4931
4932         spin_lock(&recall_lock);
4933         count = nfsd_find_all_delegations(clp, max, NULL);
4934         spin_unlock(&recall_lock);
4935
4936         nfsd_print_count(clp, count, "delegations");
4937         return count;
4938 }
4939
4940 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
4941 {
4942         struct nfs4_client *clp, *next;
4943         u64 count = 0;
4944         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4945
4946         if (!nfsd_netns_ready(nn))
4947                 return 0;
4948
4949         list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
4950                 count += func(clp, max - count);
4951                 if ((max != 0) && (count >= max))
4952                         break;
4953         }
4954
4955         return count;
4956 }
4957
4958 struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
4959 {
4960         struct nfs4_client *clp;
4961         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
4962
4963         if (!nfsd_netns_ready(nn))
4964                 return NULL;
4965
4966         list_for_each_entry(clp, &nn->client_lru, cl_lru) {
4967                 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
4968                         return clp;
4969         }
4970         return NULL;
4971 }
4972
4973 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4974
4975 /* initialization to perform at module load time: */
4976
4977 void
4978 nfs4_state_init(void)
4979 {
4980 }
4981
4982 /*
4983  * Since the lifetime of a delegation isn't limited to that of an open, a
4984  * client may quite reasonably hang on to a delegation as long as it has
4985  * the inode cached.  This becomes an obvious problem the first time a
4986  * client's inode cache approaches the size of the server's total memory.
4987  *
4988  * For now we avoid this problem by imposing a hard limit on the number
4989  * of delegations, which varies according to the server's memory size.
4990  */
4991 static void
4992 set_max_delegations(void)
4993 {
4994         /*
4995          * Allow at most 4 delegations per megabyte of RAM.  Quick
4996          * estimates suggest that in the worst case (where every delegation
4997          * is for a different inode), a delegation could take about 1.5K,
4998          * giving a worst case usage of about 6% of memory.
4999          */
5000         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
5001 }
5002
5003 static int nfs4_state_create_net(struct net *net)
5004 {
5005         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5006         int i;
5007
5008         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5009                         CLIENT_HASH_SIZE, GFP_KERNEL);
5010         if (!nn->conf_id_hashtbl)
5011                 goto err;
5012         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
5013                         CLIENT_HASH_SIZE, GFP_KERNEL);
5014         if (!nn->unconf_id_hashtbl)
5015                 goto err_unconf_id;
5016         nn->ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
5017                         OWNER_HASH_SIZE, GFP_KERNEL);
5018         if (!nn->ownerstr_hashtbl)
5019                 goto err_ownerstr;
5020         nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
5021                         LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
5022         if (!nn->lockowner_ino_hashtbl)
5023                 goto err_lockowner_ino;
5024         nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
5025                         SESSION_HASH_SIZE, GFP_KERNEL);
5026         if (!nn->sessionid_hashtbl)
5027                 goto err_sessionid;
5028
5029         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5030                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
5031                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
5032         }
5033         for (i = 0; i < OWNER_HASH_SIZE; i++)
5034                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
5035         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
5036                 INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
5037         for (i = 0; i < SESSION_HASH_SIZE; i++)
5038                 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
5039         nn->conf_name_tree = RB_ROOT;
5040         nn->unconf_name_tree = RB_ROOT;
5041         INIT_LIST_HEAD(&nn->client_lru);
5042         INIT_LIST_HEAD(&nn->close_lru);
5043         INIT_LIST_HEAD(&nn->del_recall_lru);
5044         spin_lock_init(&nn->client_lock);
5045
5046         INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
5047         get_net(net);
5048
5049         return 0;
5050
5051 err_sessionid:
5052         kfree(nn->lockowner_ino_hashtbl);
5053 err_lockowner_ino:
5054         kfree(nn->ownerstr_hashtbl);
5055 err_ownerstr:
5056         kfree(nn->unconf_id_hashtbl);
5057 err_unconf_id:
5058         kfree(nn->conf_id_hashtbl);
5059 err:
5060         return -ENOMEM;
5061 }
5062
5063 static void
5064 nfs4_state_destroy_net(struct net *net)
5065 {
5066         int i;
5067         struct nfs4_client *clp = NULL;
5068         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5069
5070         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5071                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
5072                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5073                         destroy_client(clp);
5074                 }
5075         }
5076
5077         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5078                 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
5079                         clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
5080                         destroy_client(clp);
5081                 }
5082         }
5083
5084         kfree(nn->sessionid_hashtbl);
5085         kfree(nn->lockowner_ino_hashtbl);
5086         kfree(nn->ownerstr_hashtbl);
5087         kfree(nn->unconf_id_hashtbl);
5088         kfree(nn->conf_id_hashtbl);
5089         put_net(net);
5090 }
5091
5092 int
5093 nfs4_state_start_net(struct net *net)
5094 {
5095         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5096         int ret;
5097
5098         ret = nfs4_state_create_net(net);
5099         if (ret)
5100                 return ret;
5101         nfsd4_client_tracking_init(net);
5102         nn->boot_time = get_seconds();
5103         locks_start_grace(net, &nn->nfsd4_manager);
5104         nn->grace_ended = false;
5105         printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
5106                nn->nfsd4_grace, net);
5107         queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
5108         return 0;
5109 }
5110
5111 /* initialization to perform when the nfsd service is started: */
5112
5113 int
5114 nfs4_state_start(void)
5115 {
5116         int ret;
5117
5118         ret = set_callback_cred();
5119         if (ret)
5120                 return -ENOMEM;
5121         laundry_wq = create_singlethread_workqueue("nfsd4");
5122         if (laundry_wq == NULL) {
5123                 ret = -ENOMEM;
5124                 goto out_recovery;
5125         }
5126         ret = nfsd4_create_callback_queue();
5127         if (ret)
5128                 goto out_free_laundry;
5129
5130         set_max_delegations();
5131
5132         return 0;
5133
5134 out_free_laundry:
5135         destroy_workqueue(laundry_wq);
5136 out_recovery:
5137         return ret;
5138 }
5139
5140 void
5141 nfs4_state_shutdown_net(struct net *net)
5142 {
5143         struct nfs4_delegation *dp = NULL;
5144         struct list_head *pos, *next, reaplist;
5145         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5146
5147         cancel_delayed_work_sync(&nn->laundromat_work);
5148         locks_end_grace(&nn->nfsd4_manager);
5149
5150         nfs4_lock_state();
5151         INIT_LIST_HEAD(&reaplist);
5152         spin_lock(&recall_lock);
5153         list_for_each_safe(pos, next, &nn->del_recall_lru) {
5154                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5155                 list_move(&dp->dl_recall_lru, &reaplist);
5156         }
5157         spin_unlock(&recall_lock);
5158         list_for_each_safe(pos, next, &reaplist) {
5159                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5160                 destroy_delegation(dp);
5161         }
5162
5163         nfsd4_client_tracking_exit(net);
5164         nfs4_state_destroy_net(net);
5165         nfs4_unlock_state();
5166 }
5167
5168 void
5169 nfs4_state_shutdown(void)
5170 {
5171         destroy_workqueue(laundry_wq);
5172         nfsd4_destroy_callback_queue();
5173 }
5174
5175 static void
5176 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5177 {
5178         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
5179                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
5180 }
5181
5182 static void
5183 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
5184 {
5185         if (cstate->minorversion) {
5186                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
5187                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5188         }
5189 }
5190
5191 void
5192 clear_current_stateid(struct nfsd4_compound_state *cstate)
5193 {
5194         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
5195 }
5196
5197 /*
5198  * functions to set current state id
5199  */
5200 void
5201 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5202 {
5203         put_stateid(cstate, &odp->od_stateid);
5204 }
5205
5206 void
5207 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
5208 {
5209         put_stateid(cstate, &open->op_stateid);
5210 }
5211
5212 void
5213 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5214 {
5215         put_stateid(cstate, &close->cl_stateid);
5216 }
5217
5218 void
5219 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
5220 {
5221         put_stateid(cstate, &lock->lk_resp_stateid);
5222 }
5223
5224 /*
5225  * functions to consume current state id
5226  */
5227
5228 void
5229 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
5230 {
5231         get_stateid(cstate, &odp->od_stateid);
5232 }
5233
5234 void
5235 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
5236 {
5237         get_stateid(cstate, &drp->dr_stateid);
5238 }
5239
5240 void
5241 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
5242 {
5243         get_stateid(cstate, &fsp->fr_stateid);
5244 }
5245
5246 void
5247 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
5248 {
5249         get_stateid(cstate, &setattr->sa_stateid);
5250 }
5251
5252 void
5253 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
5254 {
5255         get_stateid(cstate, &close->cl_stateid);
5256 }
5257
5258 void
5259 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
5260 {
5261         get_stateid(cstate, &locku->lu_stateid);
5262 }
5263
5264 void
5265 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
5266 {
5267         get_stateid(cstate, &read->rd_stateid);
5268 }
5269
5270 void
5271 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5272 {
5273         get_stateid(cstate, &write->wr_stateid);
5274 }