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/clnt.h>
  44 #include "xdr4.h"
  45 #include "vfs.h"
  46 #include "current_stateid.h"
  47 #include "fault_inject.h"
  48
  49 #include "netns.h"
  50
  51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  52
  53 /* Globals */
  54 time_t nfsd4_lease = 90;     /* default lease time */
  55 time_t nfsd4_grace = 90;
  56
  57 #define all_ones {{~0,~0},~0}
  58 static const stateid_t one_stateid = {
  59         .si_generation = ~0,
  60         .si_opaque = all_ones,
  61 };
  62 static const stateid_t zero_stateid = {
  63         /* all fields zero */
  64 };
  65 static const stateid_t currentstateid = {
  66         .si_generation = 1,
  67 };
  68
  69 static u64 current_sessionid = 1;
  70
  71 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
  72 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
  73 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
  74
  75 /* forward declarations */
  76 static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
  77
  78 /* Locking: */
  79
  80 /* Currently used for almost all code touching nfsv4 state: */
  81 static DEFINE_MUTEX(client_mutex);
  82
  83 /*
  84  * Currently used for the del_recall_lru and file hash table.  In an
  85  * effort to decrease the scope of the client_mutex, this spinlock may
  86  * eventually cover more:
  87  */
  88 static DEFINE_SPINLOCK(recall_lock);
  89
  90 static struct kmem_cache *openowner_slab = NULL;
  91 static struct kmem_cache *lockowner_slab = NULL;
  92 static struct kmem_cache *file_slab = NULL;
  93 static struct kmem_cache *stateid_slab = NULL;
  94 static struct kmem_cache *deleg_slab = NULL;
  95
  96 void
  97 nfs4_lock_state(void)
  98 {
  99         mutex_lock(&client_mutex);
 100 }
 101
 102 static void free_session(struct kref *);
 103
 104 /* Must be called under the client_lock */
 105 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
 106 {
 107         kref_put(&ses->se_ref, free_session);
 108 }
 109
 110 static void nfsd4_get_session(struct nfsd4_session *ses)
 111 {
 112         kref_get(&ses->se_ref);
 113 }
 114
 115 void
 116 nfs4_unlock_state(void)
 117 {
 118         mutex_unlock(&client_mutex);
 119 }
 120
 121 static inline u32
 122 opaque_hashval(const void *ptr, int nbytes)
 123 {
 124         unsigned char *cptr = (unsigned char *) ptr;
 125
 126         u32 x = 0;
 127         while (nbytes--) {
 128                 x *= 37;
 129                 x += *cptr++;
 130         }
 131         return x;
 132 }
 133
 134 static struct list_head del_recall_lru;
 135
 136 static void nfsd4_free_file(struct nfs4_file *f)
 137 {
 138         kmem_cache_free(file_slab, f);
 139 }
 140
 141 static inline void
 142 put_nfs4_file(struct nfs4_file *fi)
 143 {
 144         if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
 145                 list_del(&fi->fi_hash);
 146                 spin_unlock(&recall_lock);
 147                 iput(fi->fi_inode);
 148                 nfsd4_free_file(fi);
 149         }
 150 }
 151
 152 static inline void
 153 get_nfs4_file(struct nfs4_file *fi)
 154 {
 155         atomic_inc(&fi->fi_ref);
 156 }
 157
 158 static int num_delegations;
 159 unsigned int max_delegations;
 160
 161 /*
 162  * Open owner state (share locks)
 163  */
 164
 165 /* hash tables for lock and open owners */
 166 #define OWNER_HASH_BITS              8
 167 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 168 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 169
 170 static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
 171 {
 172         unsigned int ret;
 173
 174         ret = opaque_hashval(ownername->data, ownername->len);
 175         ret += clientid;
 176         return ret & OWNER_HASH_MASK;
 177 }
 178
 179 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 180
 181 /* hash table for nfs4_file */
 182 #define FILE_HASH_BITS                   8
 183 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 184
 185 static unsigned int file_hashval(struct inode *ino)
 186 {
 187         /* XXX: why are we hashing on inode pointer, anyway? */
 188         return hash_ptr(ino, FILE_HASH_BITS);
 189 }
 190
 191 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 192
 193 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 194 {
 195         BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 196         atomic_inc(&fp->fi_access[oflag]);
 197 }
 198
 199 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 200 {
 201         if (oflag == O_RDWR) {
 202                 __nfs4_file_get_access(fp, O_RDONLY);
 203                 __nfs4_file_get_access(fp, O_WRONLY);
 204         } else
 205                 __nfs4_file_get_access(fp, oflag);
 206 }
 207
 208 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
 209 {
 210         if (fp->fi_fds[oflag]) {
 211                 fput(fp->fi_fds[oflag]);
 212                 fp->fi_fds[oflag] = NULL;
 213         }
 214 }
 215
 216 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 217 {
 218         if (atomic_dec_and_test(&fp->fi_access[oflag])) {
 219                 nfs4_file_put_fd(fp, oflag);
 220                 /*
 221                  * It's also safe to get rid of the RDWR open *if*
 222                  * we no longer have need of the other kind of access
 223                  * or if we already have the other kind of open:
 224                  */
 225                 if (fp->fi_fds[1-oflag]
 226                         || atomic_read(&fp->fi_access[1 - oflag]) == 0)
 227                         nfs4_file_put_fd(fp, O_RDWR);
 228         }
 229 }
 230
 231 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
 232 {
 233         if (oflag == O_RDWR) {
 234                 __nfs4_file_put_access(fp, O_RDONLY);
 235                 __nfs4_file_put_access(fp, O_WRONLY);
 236         } else
 237                 __nfs4_file_put_access(fp, oflag);
 238 }
 239
 240 static inline int get_new_stid(struct nfs4_stid *stid)
 241 {
 242         static int min_stateid = 0;
 243         struct idr *stateids = &stid->sc_client->cl_stateids;
 244         int new_stid;
 245         int error;
 246
 247         error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
 248         /*
 249          * Note: the necessary preallocation was done in
 250          * nfs4_alloc_stateid().  The idr code caps the number of
 251          * preallocations that can exist at a time, but the state lock
 252          * prevents anyone from using ours before we get here:
 253          */
 254         BUG_ON(error);
 255         /*
 256          * It shouldn't be a problem to reuse an opaque stateid value.
 257          * I don't think it is for 4.1.  But with 4.0 I worry that, for
 258          * example, a stray write retransmission could be accepted by
 259          * the server when it should have been rejected.  Therefore,
 260          * adopt a trick from the sctp code to attempt to maximize the
 261          * amount of time until an id is reused, by ensuring they always
 262          * "increase" (mod INT_MAX):
 263          */
 264
 265         min_stateid = new_stid+1;
 266         if (min_stateid == INT_MAX)
 267                 min_stateid = 0;
 268         return new_stid;
 269 }
 270
 271 static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
 272 {
 273         stateid_t *s = &stid->sc_stateid;
 274         int new_id;
 275
 276         stid->sc_type = type;
 277         stid->sc_client = cl;
 278         s->si_opaque.so_clid = cl->cl_clientid;
 279         new_id = get_new_stid(stid);
 280         s->si_opaque.so_id = (u32)new_id;
 281         /* Will be incremented before return to client: */
 282         s->si_generation = 0;
 283 }
 284
 285 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
 286 {
 287         struct idr *stateids = &cl->cl_stateids;
 288
 289         if (!idr_pre_get(stateids, GFP_KERNEL))
 290                 return NULL;
 291         /*
 292          * Note: if we fail here (or any time between now and the time
 293          * we actually get the new idr), we won't need to undo the idr
 294          * preallocation, since the idr code caps the number of
 295          * preallocated entries.
 296          */
 297         return kmem_cache_alloc(slab, GFP_KERNEL);
 298 }
 299
 300 static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
 301 {
 302         return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
 303 }
 304
 305 static struct nfs4_delegation *
 306 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
 307 {
 308         struct nfs4_delegation *dp;
 309         struct nfs4_file *fp = stp->st_file;
 310
 311         dprintk("NFSD alloc_init_deleg\n");
 312         /*
 313          * Major work on the lease subsystem (for example, to support
 314          * calbacks on stat) will be required before we can support
 315          * write delegations properly.
 316          */
 317         if (type != NFS4_OPEN_DELEGATE_READ)
 318                 return NULL;
 319         if (fp->fi_had_conflict)
 320                 return NULL;
 321         if (num_delegations > max_delegations)
 322                 return NULL;
 323         dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
 324         if (dp == NULL)
 325                 return dp;
 326         init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
 327         /*
 328          * delegation seqid's are never incremented.  The 4.1 special
 329          * meaning of seqid 0 isn't meaningful, really, but let's avoid
 330          * 0 anyway just for consistency and use 1:
 331          */
 332         dp->dl_stid.sc_stateid.si_generation = 1;
 333         num_delegations++;
 334         INIT_LIST_HEAD(&dp->dl_perfile);
 335         INIT_LIST_HEAD(&dp->dl_perclnt);
 336         INIT_LIST_HEAD(&dp->dl_recall_lru);
 337         get_nfs4_file(fp);
 338         dp->dl_file = fp;
 339         dp->dl_type = type;
 340         fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
 341         dp->dl_time = 0;
 342         atomic_set(&dp->dl_count, 1);
 343         nfsd4_init_callback(&dp->dl_recall);
 344         return dp;
 345 }
 346
 347 void
 348 nfs4_put_delegation(struct nfs4_delegation *dp)
 349 {
 350         if (atomic_dec_and_test(&dp->dl_count)) {
 351                 dprintk("NFSD: freeing dp %p\n",dp);
 352                 put_nfs4_file(dp->dl_file);
 353                 kmem_cache_free(deleg_slab, dp);
 354                 num_delegations--;
 355         }
 356 }
 357
 358 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
 359 {
 360         if (atomic_dec_and_test(&fp->fi_delegees)) {
 361                 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
 362                 fp->fi_lease = NULL;
 363                 fput(fp->fi_deleg_file);
 364                 fp->fi_deleg_file = NULL;
 365         }
 366 }
 367
 368 static void unhash_stid(struct nfs4_stid *s)
 369 {
 370         struct idr *stateids = &s->sc_client->cl_stateids;
 371
 372         idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
 373 }
 374
 375 /* Called under the state lock. */
 376 static void
 377 unhash_delegation(struct nfs4_delegation *dp)
 378 {
 379         unhash_stid(&dp->dl_stid);
 380         list_del_init(&dp->dl_perclnt);
 381         spin_lock(&recall_lock);
 382         list_del_init(&dp->dl_perfile);
 383         list_del_init(&dp->dl_recall_lru);
 384         spin_unlock(&recall_lock);
 385         nfs4_put_deleg_lease(dp->dl_file);
 386         nfs4_put_delegation(dp);
 387 }
 388
 389 /*
 390  * SETCLIENTID state
 391  */
 392
 393 /* client_lock protects the client lru list and session hash table */
 394 static DEFINE_SPINLOCK(client_lock);
 395
 396 static unsigned int clientid_hashval(u32 id)
 397 {
 398         return id & CLIENT_HASH_MASK;
 399 }
 400
 401 static unsigned int clientstr_hashval(const char *name)
 402 {
 403         return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
 404 }
 405
 406 /*
 407  * unconf_id_hashtbl[] and unconf_name_tree hold unconfirmed
 408  * setclientid info.
 409  *
 410  * client_lru holds client queue ordered by nfs4_client.cl_time
 411  * for lease renewal.
 412  *
 413  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 414  * for last close replay.
 415  *
 416  * All of the above fields are protected by the client_mutex.
 417  */
 418 static struct rb_root unconf_name_tree;
 419 static struct list_head client_lru;
 420 static struct list_head close_lru;
 421
 422 /*
 423  * We store the NONE, READ, WRITE, and BOTH bits separately in the
 424  * st_{access,deny}_bmap field of the stateid, in order to track not
 425  * only what share bits are currently in force, but also what
 426  * combinations of share bits previous opens have used.  This allows us
 427  * to enforce the recommendation of rfc 3530 14.2.19 that the server
 428  * return an error if the client attempt to downgrade to a combination
 429  * of share bits not explicable by closing some of its previous opens.
 430  *
 431  * XXX: This enforcement is actually incomplete, since we don't keep
 432  * track of access/deny bit combinations; so, e.g., we allow:
 433  *
 434  *      OPEN allow read, deny write
 435  *      OPEN allow both, deny none
 436  *      DOWNGRADE allow read, deny none
 437  *
 438  * which we should reject.
 439  */
 440 static unsigned int
 441 bmap_to_share_mode(unsigned long bmap) {
 442         int i;
 443         unsigned int access = 0;
 444
 445         for (i = 1; i < 4; i++) {
 446                 if (test_bit(i, &bmap))
 447                         access |= i;
 448         }
 449         return access;
 450 }
 451
 452 static bool
 453 test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) {
 454         unsigned int access, deny;
 455
 456         access = bmap_to_share_mode(stp->st_access_bmap);
 457         deny = bmap_to_share_mode(stp->st_deny_bmap);
 458         if ((access & open->op_share_deny) || (deny & open->op_share_access))
 459                 return false;
 460         return true;
 461 }
 462
 463 /* set share access for a given stateid */
 464 static inline void
 465 set_access(u32 access, struct nfs4_ol_stateid *stp)
 466 {
 467         __set_bit(access, &stp->st_access_bmap);
 468 }
 469
 470 /* clear share access for a given stateid */
 471 static inline void
 472 clear_access(u32 access, struct nfs4_ol_stateid *stp)
 473 {
 474         __clear_bit(access, &stp->st_access_bmap);
 475 }
 476
 477 /* test whether a given stateid has access */
 478 static inline bool
 479 test_access(u32 access, struct nfs4_ol_stateid *stp)
 480 {
 481         return test_bit(access, &stp->st_access_bmap);
 482 }
 483
 484 /* set share deny for a given stateid */
 485 static inline void
 486 set_deny(u32 access, struct nfs4_ol_stateid *stp)
 487 {
 488         __set_bit(access, &stp->st_deny_bmap);
 489 }
 490
 491 /* clear share deny for a given stateid */
 492 static inline void
 493 clear_deny(u32 access, struct nfs4_ol_stateid *stp)
 494 {
 495         __clear_bit(access, &stp->st_deny_bmap);
 496 }
 497
 498 /* test whether a given stateid is denying specific access */
 499 static inline bool
 500 test_deny(u32 access, struct nfs4_ol_stateid *stp)
 501 {
 502         return test_bit(access, &stp->st_deny_bmap);
 503 }
 504
 505 static int nfs4_access_to_omode(u32 access)
 506 {
 507         switch (access & NFS4_SHARE_ACCESS_BOTH) {
 508         case NFS4_SHARE_ACCESS_READ:
 509                 return O_RDONLY;
 510         case NFS4_SHARE_ACCESS_WRITE:
 511                 return O_WRONLY;
 512         case NFS4_SHARE_ACCESS_BOTH:
 513                 return O_RDWR;
 514         }
 515         BUG();
 516 }
 517
 518 /* release all access and file references for a given stateid */
 519 static void
 520 release_all_access(struct nfs4_ol_stateid *stp)
 521 {
 522         int i;
 523
 524         for (i = 1; i < 4; i++) {
 525                 if (test_access(i, stp))
 526                         nfs4_file_put_access(stp->st_file,
 527                                              nfs4_access_to_omode(i));
 528                 clear_access(i, stp);
 529         }
 530 }
 531
 532 static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
 533 {
 534         list_del(&stp->st_perfile);
 535         list_del(&stp->st_perstateowner);
 536 }
 537
 538 static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 539 {
 540         release_all_access(stp);
 541         put_nfs4_file(stp->st_file);
 542         stp->st_file = NULL;
 543 }
 544
 545 static void free_generic_stateid(struct nfs4_ol_stateid *stp)
 546 {
 547         kmem_cache_free(stateid_slab, stp);
 548 }
 549
 550 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
 551 {
 552         struct file *file;
 553
 554         unhash_generic_stateid(stp);
 555         unhash_stid(&stp->st_stid);
 556         file = find_any_file(stp->st_file);
 557         if (file)
 558                 locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
 559         close_generic_stateid(stp);
 560         free_generic_stateid(stp);
 561 }
 562
 563 static void unhash_lockowner(struct nfs4_lockowner *lo)
 564 {
 565         struct nfs4_ol_stateid *stp;
 566
 567         list_del(&lo->lo_owner.so_strhash);
 568         list_del(&lo->lo_perstateid);
 569         list_del(&lo->lo_owner_ino_hash);
 570         while (!list_empty(&lo->lo_owner.so_stateids)) {
 571                 stp = list_first_entry(&lo->lo_owner.so_stateids,
 572                                 struct nfs4_ol_stateid, st_perstateowner);
 573                 release_lock_stateid(stp);
 574         }
 575 }
 576
 577 static void release_lockowner(struct nfs4_lockowner *lo)
 578 {
 579         unhash_lockowner(lo);
 580         nfs4_free_lockowner(lo);
 581 }
 582
 583 static void
 584 release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
 585 {
 586         struct nfs4_lockowner *lo;
 587
 588         while (!list_empty(&open_stp->st_lockowners)) {
 589                 lo = list_entry(open_stp->st_lockowners.next,
 590                                 struct nfs4_lockowner, lo_perstateid);
 591                 release_lockowner(lo);
 592         }
 593 }
 594
 595 static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 596 {
 597         unhash_generic_stateid(stp);
 598         release_stateid_lockowners(stp);
 599         close_generic_stateid(stp);
 600 }
 601
 602 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 603 {
 604         unhash_open_stateid(stp);
 605         unhash_stid(&stp->st_stid);
 606         free_generic_stateid(stp);
 607 }
 608
 609 static void unhash_openowner(struct nfs4_openowner *oo)
 610 {
 611         struct nfs4_ol_stateid *stp;
 612
 613         list_del(&oo->oo_owner.so_strhash);
 614         list_del(&oo->oo_perclient);
 615         while (!list_empty(&oo->oo_owner.so_stateids)) {
 616                 stp = list_first_entry(&oo->oo_owner.so_stateids,
 617                                 struct nfs4_ol_stateid, st_perstateowner);
 618                 release_open_stateid(stp);
 619         }
 620 }
 621
 622 static void release_last_closed_stateid(struct nfs4_openowner *oo)
 623 {
 624         struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 625
 626         if (s) {
 627                 unhash_stid(&s->st_stid);
 628                 free_generic_stateid(s);
 629                 oo->oo_last_closed_stid = NULL;
 630         }
 631 }
 632
 633 static void release_openowner(struct nfs4_openowner *oo)
 634 {
 635         unhash_openowner(oo);
 636         list_del(&oo->oo_close_lru);
 637         release_last_closed_stateid(oo);
 638         nfs4_free_openowner(oo);
 639 }
 640
 641 #define SESSION_HASH_SIZE       512
 642 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
 643
 644 static inline int
 645 hash_sessionid(struct nfs4_sessionid *sessionid)
 646 {
 647         struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
 648
 649         return sid->sequence % SESSION_HASH_SIZE;
 650 }
 651
 652 #ifdef NFSD_DEBUG
 653 static inline void
 654 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 655 {
 656         u32 *ptr = (u32 *)(&sessionid->data[0]);
 657         dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
 658 }
 659 #else
 660 static inline void
 661 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
 662 {
 663 }
 664 #endif
 665
 666
 667 static void
 668 gen_sessionid(struct nfsd4_session *ses)
 669 {
 670         struct nfs4_client *clp = ses->se_client;
 671         struct nfsd4_sessionid *sid;
 672
 673         sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
 674         sid->clientid = clp->cl_clientid;
 675         sid->sequence = current_sessionid++;
 676         sid->reserved = 0;
 677 }
 678
 679 /*
 680  * The protocol defines ca_maxresponssize_cached to include the size of
 681  * the rpc header, but all we need to cache is the data starting after
 682  * the end of the initial SEQUENCE operation--the rest we regenerate
 683  * each time.  Therefore we can advertise a ca_maxresponssize_cached
 684  * value that is the number of bytes in our cache plus a few additional
 685  * bytes.  In order to stay on the safe side, and not promise more than
 686  * we can cache, those additional bytes must be the minimum possible: 24
 687  * bytes of rpc header (xid through accept state, with AUTH_NULL
 688  * verifier), 12 for the compound header (with zero-length tag), and 44
 689  * for the SEQUENCE op response:
 690  */
 691 #define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
 692
 693 static void
 694 free_session_slots(struct nfsd4_session *ses)
 695 {
 696         int i;
 697
 698         for (i = 0; i < ses->se_fchannel.maxreqs; i++)
 699                 kfree(ses->se_slots[i]);
 700 }
 701
 702 /*
 703  * We don't actually need to cache the rpc and session headers, so we
 704  * can allocate a little less for each slot:
 705  */
 706 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
 707 {
 708         return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
 709 }
 710
 711 static int nfsd4_sanitize_slot_size(u32 size)
 712 {
 713         size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
 714         size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
 715
 716         return size;
 717 }
 718
 719 /*
 720  * XXX: If we run out of reserved DRC memory we could (up to a point)
 721  * re-negotiate active sessions and reduce their slot usage to make
 722  * room for new connections. For now we just fail the create session.
 723  */
 724 static int nfsd4_get_drc_mem(int slotsize, u32 num)
 725 {
 726         int avail;
 727
 728         num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
 729
 730         spin_lock(&nfsd_drc_lock);
 731         avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
 732                         nfsd_drc_max_mem - nfsd_drc_mem_used);
 733         num = min_t(int, num, avail / slotsize);
 734         nfsd_drc_mem_used += num * slotsize;
 735         spin_unlock(&nfsd_drc_lock);
 736
 737         return num;
 738 }
 739
 740 static void nfsd4_put_drc_mem(int slotsize, int num)
 741 {
 742         spin_lock(&nfsd_drc_lock);
 743         nfsd_drc_mem_used -= slotsize * num;
 744         spin_unlock(&nfsd_drc_lock);
 745 }
 746
 747 static struct nfsd4_session *__alloc_session(int slotsize, int numslots)
 748 {
 749         struct nfsd4_session *new;
 750         int mem, i;
 751
 752         BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
 753                         + sizeof(struct nfsd4_session) > PAGE_SIZE);
 754         mem = numslots * sizeof(struct nfsd4_slot *);
 755
 756         new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
 757         if (!new)
 758                 return NULL;
 759         /* allocate each struct nfsd4_slot and data cache in one piece */
 760         for (i = 0; i < numslots; i++) {
 761                 mem = sizeof(struct nfsd4_slot) + slotsize;
 762                 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
 763                 if (!new->se_slots[i])
 764                         goto out_free;
 765         }
 766         return new;
 767 out_free:
 768         while (i--)
 769                 kfree(new->se_slots[i]);
 770         kfree(new);
 771         return NULL;
 772 }
 773
 774 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
 775 {
 776         u32 maxrpc = nfsd_serv->sv_max_mesg;
 777
 778         new->maxreqs = numslots;
 779         new->maxresp_cached = min_t(u32, req->maxresp_cached,
 780                                         slotsize + NFSD_MIN_HDR_SEQ_SZ);
 781         new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
 782         new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
 783         new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
 784 }
 785
 786 static void free_conn(struct nfsd4_conn *c)
 787 {
 788         svc_xprt_put(c->cn_xprt);
 789         kfree(c);
 790 }
 791
 792 static void nfsd4_conn_lost(struct svc_xpt_user *u)
 793 {
 794         struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 795         struct nfs4_client *clp = c->cn_session->se_client;
 796
 797         spin_lock(&clp->cl_lock);
 798         if (!list_empty(&c->cn_persession)) {
 799                 list_del(&c->cn_persession);
 800                 free_conn(c);
 801         }
 802         spin_unlock(&clp->cl_lock);
 803         nfsd4_probe_callback(clp);
 804 }
 805
 806 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 807 {
 808         struct nfsd4_conn *conn;
 809
 810         conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
 811         if (!conn)
 812                 return NULL;
 813         svc_xprt_get(rqstp->rq_xprt);
 814         conn->cn_xprt = rqstp->rq_xprt;
 815         conn->cn_flags = flags;
 816         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
 817         return conn;
 818 }
 819
 820 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 821 {
 822         conn->cn_session = ses;
 823         list_add(&conn->cn_persession, &ses->se_conns);
 824 }
 825
 826 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 827 {
 828         struct nfs4_client *clp = ses->se_client;
 829
 830         spin_lock(&clp->cl_lock);
 831         __nfsd4_hash_conn(conn, ses);
 832         spin_unlock(&clp->cl_lock);
 833 }
 834
 835 static int nfsd4_register_conn(struct nfsd4_conn *conn)
 836 {
 837         conn->cn_xpt_user.callback = nfsd4_conn_lost;
 838         return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
 839 }
 840
 841 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
 842 {
 843         int ret;
 844
 845         nfsd4_hash_conn(conn, ses);
 846         ret = nfsd4_register_conn(conn);
 847         if (ret)
 848                 /* oops; xprt is already down: */
 849                 nfsd4_conn_lost(&conn->cn_xpt_user);
 850         if (conn->cn_flags & NFS4_CDFC4_BACK) {
 851                 /* callback channel may be back up */
 852                 nfsd4_probe_callback(ses->se_client);
 853         }
 854 }
 855
 856 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
 857 {
 858         u32 dir = NFS4_CDFC4_FORE;
 859
 860         if (cses->flags & SESSION4_BACK_CHAN)
 861                 dir |= NFS4_CDFC4_BACK;
 862         return alloc_conn(rqstp, dir);
 863 }
 864
 865 /* must be called under client_lock */
 866 static void nfsd4_del_conns(struct nfsd4_session *s)
 867 {
 868         struct nfs4_client *clp = s->se_client;
 869         struct nfsd4_conn *c;
 870
 871         spin_lock(&clp->cl_lock);
 872         while (!list_empty(&s->se_conns)) {
 873                 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
 874                 list_del_init(&c->cn_persession);
 875                 spin_unlock(&clp->cl_lock);
 876
 877                 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
 878                 free_conn(c);
 879
 880                 spin_lock(&clp->cl_lock);
 881         }
 882         spin_unlock(&clp->cl_lock);
 883 }
 884
 885 static void __free_session(struct nfsd4_session *ses)
 886 {
 887         nfsd4_put_drc_mem(slot_bytes(&ses->se_fchannel), ses->se_fchannel.maxreqs);
 888         free_session_slots(ses);
 889         kfree(ses);
 890 }
 891
 892 static void free_session(struct kref *kref)
 893 {
 894         struct nfsd4_session *ses;
 895
 896         lockdep_assert_held(&client_lock);
 897         ses = container_of(kref, struct nfsd4_session, se_ref);
 898         nfsd4_del_conns(ses);
 899         __free_session(ses);
 900 }
 901
 902 void nfsd4_put_session(struct nfsd4_session *ses)
 903 {
 904         spin_lock(&client_lock);
 905         nfsd4_put_session_locked(ses);
 906         spin_unlock(&client_lock);
 907 }
 908
 909 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
 910 {
 911         struct nfsd4_session *new;
 912         int numslots, slotsize;
 913         /*
 914          * Note decreasing slot size below client's request may
 915          * make it difficult for client to function correctly, whereas
 916          * decreasing the number of slots will (just?) affect
 917          * performance.  When short on memory we therefore prefer to
 918          * decrease number of slots instead of their size.
 919          */
 920         slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
 921         numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
 922         if (numslots < 1)
 923                 return NULL;
 924
 925         new = __alloc_session(slotsize, numslots);
 926         if (!new) {
 927                 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
 928                 return NULL;
 929         }
 930         init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
 931         return new;
 932 }
 933
 934 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 935 {
 936         int idx;
 937
 938         new->se_client = clp;
 939         gen_sessionid(new);
 940
 941         INIT_LIST_HEAD(&new->se_conns);
 942
 943         new->se_cb_seq_nr = 1;
 944         new->se_flags = cses->flags;
 945         new->se_cb_prog = cses->callback_prog;
 946         new->se_cb_sec = cses->cb_sec;
 947         kref_init(&new->se_ref);
 948         idx = hash_sessionid(&new->se_sessionid);
 949         spin_lock(&client_lock);
 950         list_add(&new->se_hash, &sessionid_hashtbl[idx]);
 951         spin_lock(&clp->cl_lock);
 952         list_add(&new->se_perclnt, &clp->cl_sessions);
 953         spin_unlock(&clp->cl_lock);
 954         spin_unlock(&client_lock);
 955
 956         if (cses->flags & SESSION4_BACK_CHAN) {
 957                 struct sockaddr *sa = svc_addr(rqstp);
 958                 /*
 959                  * This is a little silly; with sessions there's no real
 960                  * use for the callback address.  Use the peer address
 961                  * as a reasonable default for now, but consider fixing
 962                  * the rpc client not to require an address in the
 963                  * future:
 964                  */
 965                 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
 966                 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
 967         }
 968 }
 969
 970 /* caller must hold client_lock */
 971 static struct nfsd4_session *
 972 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
 973 {
 974         struct nfsd4_session *elem;
 975         int idx;
 976
 977         dump_sessionid(__func__, sessionid);
 978         idx = hash_sessionid(sessionid);
 979         /* Search in the appropriate list */
 980         list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
 981                 if (!memcmp(elem->se_sessionid.data, sessionid->data,
 982                             NFS4_MAX_SESSIONID_LEN)) {
 983                         return elem;
 984                 }
 985         }
 986
 987         dprintk("%s: session not found\n", __func__);
 988         return NULL;
 989 }
 990
 991 /* caller must hold client_lock */
 992 static void
 993 unhash_session(struct nfsd4_session *ses)
 994 {
 995         list_del(&ses->se_hash);
 996         spin_lock(&ses->se_client->cl_lock);
 997         list_del(&ses->se_perclnt);
 998         spin_unlock(&ses->se_client->cl_lock);
 999 }
1000
1001 /* must be called under the client_lock */
1002 static inline void
1003 renew_client_locked(struct nfs4_client *clp)
1004 {
1005         if (is_client_expired(clp)) {
1006                 WARN_ON(1);
1007                 printk("%s: client (clientid %08x/%08x) already expired\n",
1008                         __func__,
1009                         clp->cl_clientid.cl_boot,
1010                         clp->cl_clientid.cl_id);
1011                 return;
1012         }
1013
1014         dprintk("renewing client (clientid %08x/%08x)\n",
1015                         clp->cl_clientid.cl_boot,
1016                         clp->cl_clientid.cl_id);
1017         list_move_tail(&clp->cl_lru, &client_lru);
1018         clp->cl_time = get_seconds();
1019 }
1020
1021 static inline void
1022 renew_client(struct nfs4_client *clp)
1023 {
1024         spin_lock(&client_lock);
1025         renew_client_locked(clp);
1026         spin_unlock(&client_lock);
1027 }
1028
1029 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1030 static int
1031 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1032 {
1033         if (clid->cl_boot == nn->boot_time)
1034                 return 0;
1035         dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1036                 clid->cl_boot, clid->cl_id, nn->boot_time);
1037         return 1;
1038 }
1039
1040 /*
1041  * XXX Should we use a slab cache ?
1042  * This type of memory management is somewhat inefficient, but we use it
1043  * anyway since SETCLIENTID is not a common operation.
1044  */
1045 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1046 {
1047         struct nfs4_client *clp;
1048
1049         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1050         if (clp == NULL)
1051                 return NULL;
1052         clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1053         if (clp->cl_name.data == NULL) {
1054                 kfree(clp);
1055                 return NULL;
1056         }
1057         clp->cl_name.len = name.len;
1058         return clp;
1059 }
1060
1061 static inline void
1062 free_client(struct nfs4_client *clp)
1063 {
1064         lockdep_assert_held(&client_lock);
1065         while (!list_empty(&clp->cl_sessions)) {
1066                 struct nfsd4_session *ses;
1067                 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1068                                 se_perclnt);
1069                 list_del(&ses->se_perclnt);
1070                 nfsd4_put_session_locked(ses);
1071         }
1072         free_svc_cred(&clp->cl_cred);
1073         kfree(clp->cl_name.data);
1074         kfree(clp);
1075 }
1076
1077 void
1078 release_session_client(struct nfsd4_session *session)
1079 {
1080         struct nfs4_client *clp = session->se_client;
1081
1082         if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
1083                 return;
1084         if (is_client_expired(clp)) {
1085                 free_client(clp);
1086                 session->se_client = NULL;
1087         } else
1088                 renew_client_locked(clp);
1089         spin_unlock(&client_lock);
1090 }
1091
1092 /* must be called under the client_lock */
1093 static inline void
1094 unhash_client_locked(struct nfs4_client *clp)
1095 {
1096         struct nfsd4_session *ses;
1097
1098         mark_client_expired(clp);
1099         list_del(&clp->cl_lru);
1100         spin_lock(&clp->cl_lock);
1101         list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1102                 list_del_init(&ses->se_hash);
1103         spin_unlock(&clp->cl_lock);
1104 }
1105
1106 static void
1107 destroy_client(struct nfs4_client *clp)
1108 {
1109         struct nfs4_openowner *oo;
1110         struct nfs4_delegation *dp;
1111         struct list_head reaplist;
1112         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1113
1114         INIT_LIST_HEAD(&reaplist);
1115         spin_lock(&recall_lock);
1116         while (!list_empty(&clp->cl_delegations)) {
1117                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1118                 list_del_init(&dp->dl_perclnt);
1119                 list_move(&dp->dl_recall_lru, &reaplist);
1120         }
1121         spin_unlock(&recall_lock);
1122         while (!list_empty(&reaplist)) {
1123                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1124                 unhash_delegation(dp);
1125         }
1126         while (!list_empty(&clp->cl_openowners)) {
1127                 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1128                 release_openowner(oo);
1129         }
1130         nfsd4_shutdown_callback(clp);
1131         if (clp->cl_cb_conn.cb_xprt)
1132                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1133         list_del(&clp->cl_idhash);
1134         if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1135                 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1136         else
1137                 rb_erase(&clp->cl_namenode, &unconf_name_tree);
1138         spin_lock(&client_lock);
1139         unhash_client_locked(clp);
1140         if (atomic_read(&clp->cl_refcount) == 0)
1141                 free_client(clp);
1142         spin_unlock(&client_lock);
1143 }
1144
1145 static void expire_client(struct nfs4_client *clp)
1146 {
1147         nfsd4_client_record_remove(clp);
1148         destroy_client(clp);
1149 }
1150
1151 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1152 {
1153         memcpy(target->cl_verifier.data, source->data,
1154                         sizeof(target->cl_verifier.data));
1155 }
1156
1157 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1158 {
1159         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1160         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1161 }
1162
1163 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1164 {
1165         if (source->cr_principal) {
1166                 target->cr_principal =
1167                                 kstrdup(source->cr_principal, GFP_KERNEL);
1168                 if (target->cr_principal == NULL)
1169                         return -ENOMEM;
1170         } else
1171                 target->cr_principal = NULL;
1172         target->cr_flavor = source->cr_flavor;
1173         target->cr_uid = source->cr_uid;
1174         target->cr_gid = source->cr_gid;
1175         target->cr_group_info = source->cr_group_info;
1176         get_group_info(target->cr_group_info);
1177         return 0;
1178 }
1179
1180 static long long
1181 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1182 {
1183         long long res;
1184
1185         res = o1->len - o2->len;
1186         if (res)
1187                 return res;
1188         return (long long)memcmp(o1->data, o2->data, o1->len);
1189 }
1190
1191 static int same_name(const char *n1, const char *n2)
1192 {
1193         return 0 == memcmp(n1, n2, HEXDIR_LEN);
1194 }
1195
1196 static int
1197 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1198 {
1199         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1200 }
1201
1202 static int
1203 same_clid(clientid_t *cl1, clientid_t *cl2)
1204 {
1205         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1206 }
1207
1208 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1209 {
1210         int i;
1211
1212         if (g1->ngroups != g2->ngroups)
1213                 return false;
1214         for (i=0; i<g1->ngroups; i++)
1215                 if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
1216                         return false;
1217         return true;
1218 }
1219
1220 /*
1221  * RFC 3530 language requires clid_inuse be returned when the
1222  * "principal" associated with a requests differs from that previously
1223  * used.  We use uid, gid's, and gss principal string as our best
1224  * approximation.  We also don't want to allow non-gss use of a client
1225  * established using gss: in theory cr_principal should catch that
1226  * change, but in practice cr_principal can be null even in the gss case
1227  * since gssd doesn't always pass down a principal string.
1228  */
1229 static bool is_gss_cred(struct svc_cred *cr)
1230 {
1231         /* Is cr_flavor one of the gss "pseudoflavors"?: */
1232         return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1233 }
1234
1235
1236 static bool
1237 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1238 {
1239         if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1240                 || (cr1->cr_uid != cr2->cr_uid)
1241                 || (cr1->cr_gid != cr2->cr_gid)
1242                 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1243                 return false;
1244         if (cr1->cr_principal == cr2->cr_principal)
1245                 return true;
1246         if (!cr1->cr_principal || !cr2->cr_principal)
1247                 return false;
1248         return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1249 }
1250
1251 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1252 {
1253         static u32 current_clientid = 1;
1254
1255         clp->cl_clientid.cl_boot = nn->boot_time;
1256         clp->cl_clientid.cl_id = current_clientid++;
1257 }
1258
1259 static void gen_confirm(struct nfs4_client *clp)
1260 {
1261         __be32 verf[2];
1262         static u32 i;
1263
1264         verf[0] = (__be32)get_seconds();
1265         verf[1] = (__be32)i++;
1266         memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1267 }
1268
1269 static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
1270 {
1271         return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1272 }
1273
1274 static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1275 {
1276         struct nfs4_stid *s;
1277
1278         s = find_stateid(cl, t);
1279         if (!s)
1280                 return NULL;
1281         if (typemask & s->sc_type)
1282                 return s;
1283         return NULL;
1284 }
1285
1286 static struct nfs4_client *create_client(struct xdr_netobj name,
1287                 struct svc_rqst *rqstp, nfs4_verifier *verf)
1288 {
1289         struct nfs4_client *clp;
1290         struct sockaddr *sa = svc_addr(rqstp);
1291         int ret;
1292         struct net *net = SVC_NET(rqstp);
1293
1294         clp = alloc_client(name);
1295         if (clp == NULL)
1296                 return NULL;
1297
1298         INIT_LIST_HEAD(&clp->cl_sessions);
1299         ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1300         if (ret) {
1301                 spin_lock(&client_lock);
1302                 free_client(clp);
1303                 spin_unlock(&client_lock);
1304                 return NULL;
1305         }
1306         idr_init(&clp->cl_stateids);
1307         atomic_set(&clp->cl_refcount, 0);
1308         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1309         INIT_LIST_HEAD(&clp->cl_idhash);
1310         INIT_LIST_HEAD(&clp->cl_openowners);
1311         INIT_LIST_HEAD(&clp->cl_delegations);
1312         INIT_LIST_HEAD(&clp->cl_lru);
1313         INIT_LIST_HEAD(&clp->cl_callbacks);
1314         spin_lock_init(&clp->cl_lock);
1315         nfsd4_init_callback(&clp->cl_cb_null);
1316         clp->cl_time = get_seconds();
1317         clear_bit(0, &clp->cl_cb_slot_busy);
1318         rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1319         copy_verf(clp, verf);
1320         rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1321         gen_confirm(clp);
1322         clp->cl_cb_session = NULL;
1323         clp->net = net;
1324         return clp;
1325 }
1326
1327 static void
1328 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1329 {
1330         struct rb_node **new = &(root->rb_node), *parent = NULL;
1331         struct nfs4_client *clp;
1332
1333         while (*new) {
1334                 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1335                 parent = *new;
1336
1337                 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1338                         new = &((*new)->rb_left);
1339                 else
1340                         new = &((*new)->rb_right);
1341         }
1342
1343         rb_link_node(&new_clp->cl_namenode, parent, new);
1344         rb_insert_color(&new_clp->cl_namenode, root);
1345 }
1346
1347 static struct nfs4_client *
1348 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1349 {
1350         long long cmp;
1351         struct rb_node *node = root->rb_node;
1352         struct nfs4_client *clp;
1353
1354         while (node) {
1355                 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1356                 cmp = compare_blob(&clp->cl_name, name);
1357                 if (cmp > 0)
1358                         node = node->rb_left;
1359                 else if (cmp < 0)
1360                         node = node->rb_right;
1361                 else
1362                         return clp;
1363         }
1364         return NULL;
1365 }
1366
1367 static void
1368 add_to_unconfirmed(struct nfs4_client *clp)
1369 {
1370         unsigned int idhashval;
1371         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1372
1373         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1374         add_clp_to_name_tree(clp, &unconf_name_tree);
1375         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1376         list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1377         renew_client(clp);
1378 }
1379
1380 static void
1381 move_to_confirmed(struct nfs4_client *clp)
1382 {
1383         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1384         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1385
1386         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1387         list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1388         rb_erase(&clp->cl_namenode, &unconf_name_tree);
1389         add_clp_to_name_tree(clp, &nn->conf_name_tree);
1390         set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1391         renew_client(clp);
1392 }
1393
1394 static struct nfs4_client *
1395 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1396 {
1397         struct nfs4_client *clp;
1398         unsigned int idhashval = clientid_hashval(clid->cl_id);
1399
1400         list_for_each_entry(clp, &nn->conf_id_hashtbl[idhashval], cl_idhash) {
1401                 if (same_clid(&clp->cl_clientid, clid)) {
1402                         if ((bool)clp->cl_minorversion != sessions)
1403                                 return NULL;
1404                         renew_client(clp);
1405                         return clp;
1406                 }
1407         }
1408         return NULL;
1409 }
1410
1411 static struct nfs4_client *
1412 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1413 {
1414         struct nfs4_client *clp;
1415         unsigned int idhashval = clientid_hashval(clid->cl_id);
1416
1417         list_for_each_entry(clp, &nn->unconf_id_hashtbl[idhashval], cl_idhash) {
1418                 if (same_clid(&clp->cl_clientid, clid)) {
1419                         if ((bool)clp->cl_minorversion != sessions)
1420                                 return NULL;
1421                         return clp;
1422                 }
1423         }
1424         return NULL;
1425 }
1426
1427 static bool clp_used_exchangeid(struct nfs4_client *clp)
1428 {
1429         return clp->cl_exchange_flags != 0;
1430 }
1431
1432 static struct nfs4_client *
1433 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
1434 {
1435         return find_clp_in_name_tree(name, &nn->conf_name_tree);
1436 }
1437
1438 static struct nfs4_client *
1439 find_unconfirmed_client_by_name(struct xdr_netobj *name)
1440 {
1441         return find_clp_in_name_tree(name, &unconf_name_tree);
1442 }
1443
1444 static void
1445 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1446 {
1447         struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1448         struct sockaddr *sa = svc_addr(rqstp);
1449         u32 scopeid = rpc_get_scope_id(sa);
1450         unsigned short expected_family;
1451
1452         /* Currently, we only support tcp and tcp6 for the callback channel */
1453         if (se->se_callback_netid_len == 3 &&
1454             !memcmp(se->se_callback_netid_val, "tcp", 3))
1455                 expected_family = AF_INET;
1456         else if (se->se_callback_netid_len == 4 &&
1457                  !memcmp(se->se_callback_netid_val, "tcp6", 4))
1458                 expected_family = AF_INET6;
1459         else
1460                 goto out_err;
1461
1462         conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
1463                                             se->se_callback_addr_len,
1464                                             (struct sockaddr *)&conn->cb_addr,
1465                                             sizeof(conn->cb_addr));
1466
1467         if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1468                 goto out_err;
1469
1470         if (conn->cb_addr.ss_family == AF_INET6)
1471                 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1472
1473         conn->cb_prog = se->se_callback_prog;
1474         conn->cb_ident = se->se_callback_ident;
1475         memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
1476         return;
1477 out_err:
1478         conn->cb_addr.ss_family = AF_UNSPEC;
1479         conn->cb_addrlen = 0;
1480         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1481                 "will not receive delegations\n",
1482                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1483
1484         return;
1485 }
1486
1487 /*
1488  * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1489  */
1490 void
1491 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1492 {
1493         struct nfsd4_slot *slot = resp->cstate.slot;
1494         unsigned int base;
1495
1496         dprintk("--> %s slot %p\n", __func__, slot);
1497
1498         slot->sl_opcnt = resp->opcnt;
1499         slot->sl_status = resp->cstate.status;
1500
1501         slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
1502         if (nfsd4_not_cached(resp)) {
1503                 slot->sl_datalen = 0;
1504                 return;
1505         }
1506         slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1507         base = (char *)resp->cstate.datap -
1508                                         (char *)resp->xbuf->head[0].iov_base;
1509         if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1510                                     slot->sl_datalen))
1511                 WARN("%s: sessions DRC could not cache compound\n", __func__);
1512         return;
1513 }
1514
1515 /*
1516  * Encode the replay sequence operation from the slot values.
1517  * If cachethis is FALSE encode the uncached rep error on the next
1518  * operation which sets resp->p and increments resp->opcnt for
1519  * nfs4svc_encode_compoundres.
1520  *
1521  */
1522 static __be32
1523 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1524                           struct nfsd4_compoundres *resp)
1525 {
1526         struct nfsd4_op *op;
1527         struct nfsd4_slot *slot = resp->cstate.slot;
1528
1529         /* Encode the replayed sequence operation */
1530         op = &args->ops[resp->opcnt - 1];
1531         nfsd4_encode_operation(resp, op);
1532
1533         /* Return nfserr_retry_uncached_rep in next operation. */
1534         if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
1535                 op = &args->ops[resp->opcnt++];
1536                 op->status = nfserr_retry_uncached_rep;
1537                 nfsd4_encode_operation(resp, op);
1538         }
1539         return op->status;
1540 }
1541
1542 /*
1543  * The sequence operation is not cached because we can use the slot and
1544  * session values.
1545  */
1546 __be32
1547 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1548                          struct nfsd4_sequence *seq)
1549 {
1550         struct nfsd4_slot *slot = resp->cstate.slot;
1551         __be32 status;
1552
1553         dprintk("--> %s slot %p\n", __func__, slot);
1554
1555         /* Either returns 0 or nfserr_retry_uncached */
1556         status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1557         if (status == nfserr_retry_uncached_rep)
1558                 return status;
1559
1560         /* The sequence operation has been encoded, cstate->datap set. */
1561         memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1562
1563         resp->opcnt = slot->sl_opcnt;
1564         resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1565         status = slot->sl_status;
1566
1567         return status;
1568 }
1569
1570 /*
1571  * Set the exchange_id flags returned by the server.
1572  */
1573 static void
1574 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1575 {
1576         /* pNFS is not supported */
1577         new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1578
1579         /* Referrals are supported, Migration is not. */
1580         new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1581
1582         /* set the wire flags to return to client. */
1583         clid->flags = new->cl_exchange_flags;
1584 }
1585
1586 static bool client_has_state(struct nfs4_client *clp)
1587 {
1588         /*
1589          * Note clp->cl_openowners check isn't quite right: there's no
1590          * need to count owners without stateid's.
1591          *
1592          * Also note we should probably be using this in 4.0 case too.
1593          */
1594         return !list_empty(&clp->cl_openowners)
1595                 || !list_empty(&clp->cl_delegations)
1596                 || !list_empty(&clp->cl_sessions);
1597 }
1598
1599 __be32
1600 nfsd4_exchange_id(struct svc_rqst *rqstp,
1601                   struct nfsd4_compound_state *cstate,
1602                   struct nfsd4_exchange_id *exid)
1603 {
1604         struct nfs4_client *unconf, *conf, *new;
1605         __be32 status;
1606         char                    addr_str[INET6_ADDRSTRLEN];
1607         nfs4_verifier           verf = exid->verifier;
1608         struct sockaddr         *sa = svc_addr(rqstp);
1609         bool    update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
1610         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1611
1612         rpc_ntop(sa, addr_str, sizeof(addr_str));
1613         dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1614                 "ip_addr=%s flags %x, spa_how %d\n",
1615                 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1616                 addr_str, exid->flags, exid->spa_how);
1617
1618         if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
1619                 return nfserr_inval;
1620
1621         /* Currently only support SP4_NONE */
1622         switch (exid->spa_how) {
1623         case SP4_NONE:
1624                 break;
1625         case SP4_SSV:
1626                 return nfserr_serverfault;
1627         default:
1628                 BUG();                          /* checked by xdr code */
1629         case SP4_MACH_CRED:
1630                 return nfserr_serverfault;      /* no excuse :-/ */
1631         }
1632
1633         /* Cases below refer to rfc 5661 section 18.35.4: */
1634         nfs4_lock_state();
1635         conf = find_confirmed_client_by_name(&exid->clname, nn);
1636         if (conf) {
1637                 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
1638                 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
1639
1640                 if (update) {
1641                         if (!clp_used_exchangeid(conf)) { /* buggy client */
1642                                 status = nfserr_inval;
1643                                 goto out;
1644                         }
1645                         if (!creds_match) { /* case 9 */
1646                                 status = nfserr_perm;
1647                                 goto out;
1648                         }
1649                         if (!verfs_match) { /* case 8 */
1650                                 status = nfserr_not_same;
1651                                 goto out;
1652                         }
1653                         /* case 6 */
1654                         exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1655                         new = conf;
1656                         goto out_copy;
1657                 }
1658                 if (!creds_match) { /* case 3 */
1659                         if (client_has_state(conf)) {
1660                                 status = nfserr_clid_inuse;
1661                                 goto out;
1662                         }
1663                         expire_client(conf);
1664                         goto out_new;
1665                 }
1666                 if (verfs_match) { /* case 2 */
1667                         conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
1668                         new = conf;
1669                         goto out_copy;
1670                 }
1671                 /* case 5, client reboot */
1672                 goto out_new;
1673         }
1674
1675         if (update) { /* case 7 */
1676                 status = nfserr_noent;
1677                 goto out;
1678         }
1679
1680         unconf  = find_unconfirmed_client_by_name(&exid->clname);
1681         if (unconf) /* case 4, possible retry or client restart */
1682                 expire_client(unconf);
1683
1684         /* case 1 (normal case) */
1685 out_new:
1686         new = create_client(exid->clname, rqstp, &verf);
1687         if (new == NULL) {
1688                 status = nfserr_jukebox;
1689                 goto out;
1690         }
1691         new->cl_minorversion = 1;
1692
1693         gen_clid(new, nn);
1694         add_to_unconfirmed(new);
1695 out_copy:
1696         exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1697         exid->clientid.cl_id = new->cl_clientid.cl_id;
1698
1699         exid->seqid = new->cl_cs_slot.sl_seqid + 1;
1700         nfsd4_set_ex_flags(new, exid);
1701
1702         dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1703                 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1704         status = nfs_ok;
1705
1706 out:
1707         nfs4_unlock_state();
1708         return status;
1709 }
1710
1711 static __be32
1712 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1713 {
1714         dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1715                 slot_seqid);
1716
1717         /* The slot is in use, and no response has been sent. */
1718         if (slot_inuse) {
1719                 if (seqid == slot_seqid)
1720                         return nfserr_jukebox;
1721                 else
1722                         return nfserr_seq_misordered;
1723         }
1724         /* Note unsigned 32-bit arithmetic handles wraparound: */
1725         if (likely(seqid == slot_seqid + 1))
1726                 return nfs_ok;
1727         if (seqid == slot_seqid)
1728                 return nfserr_replay_cache;
1729         return nfserr_seq_misordered;
1730 }
1731
1732 /*
1733  * Cache the create session result into the create session single DRC
1734  * slot cache by saving the xdr structure. sl_seqid has been set.
1735  * Do this for solo or embedded create session operations.
1736  */
1737 static void
1738 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1739                            struct nfsd4_clid_slot *slot, __be32 nfserr)
1740 {
1741         slot->sl_status = nfserr;
1742         memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1743 }
1744
1745 static __be32
1746 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1747                             struct nfsd4_clid_slot *slot)
1748 {
1749         memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1750         return slot->sl_status;
1751 }
1752
1753 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
1754                         2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1755                         1 +     /* MIN tag is length with zero, only length */ \
1756                         3 +     /* version, opcount, opcode */ \
1757                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1758                                 /* seqid, slotID, slotID, cache */ \
1759                         4 ) * sizeof(__be32))
1760
1761 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
1762                         2 +     /* verifier: AUTH_NULL, length 0 */\
1763                         1 +     /* status */ \
1764                         1 +     /* MIN tag is length with zero, only length */ \
1765                         3 +     /* opcount, opcode, opstatus*/ \
1766                         XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
1767                                 /* seqid, slotID, slotID, slotID, status */ \
1768                         5 ) * sizeof(__be32))
1769
1770 static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
1771 {
1772         return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
1773                 || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
1774 }
1775
1776 __be32
1777 nfsd4_create_session(struct svc_rqst *rqstp,
1778                      struct nfsd4_compound_state *cstate,
1779                      struct nfsd4_create_session *cr_ses)
1780 {
1781         struct sockaddr *sa = svc_addr(rqstp);
1782         struct nfs4_client *conf, *unconf;
1783         struct nfsd4_session *new;
1784         struct nfsd4_conn *conn;
1785         struct nfsd4_clid_slot *cs_slot = NULL;
1786         __be32 status = 0;
1787         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1788
1789         if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
1790                 return nfserr_inval;
1791         if (check_forechannel_attrs(cr_ses->fore_channel))
1792                 return nfserr_toosmall;
1793         new = alloc_session(&cr_ses->fore_channel);
1794         if (!new)
1795                 return nfserr_jukebox;
1796         status = nfserr_jukebox;
1797         conn = alloc_conn_from_crses(rqstp, cr_ses);
1798         if (!conn)
1799                 goto out_free_session;
1800
1801         nfs4_lock_state();
1802         unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
1803         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
1804
1805         if (conf) {
1806                 cs_slot = &conf->cl_cs_slot;
1807                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1808                 if (status == nfserr_replay_cache) {
1809                         status = nfsd4_replay_create_session(cr_ses, cs_slot);
1810                         goto out_free_conn;
1811                 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1812                         status = nfserr_seq_misordered;
1813                         goto out_free_conn;
1814                 }
1815         } else if (unconf) {
1816                 struct nfs4_client *old;
1817                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1818                     !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1819                         status = nfserr_clid_inuse;
1820                         goto out_free_conn;
1821                 }
1822                 cs_slot = &unconf->cl_cs_slot;
1823                 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1824                 if (status) {
1825                         /* an unconfirmed replay returns misordered */
1826                         status = nfserr_seq_misordered;
1827                         goto out_free_conn;
1828                 }
1829                 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
1830                 if (old)
1831                         expire_client(old);
1832                 move_to_confirmed(unconf);
1833                 conf = unconf;
1834         } else {
1835                 status = nfserr_stale_clientid;
1836                 goto out_free_conn;
1837         }
1838         status = nfs_ok;
1839         /*
1840          * We do not support RDMA or persistent sessions
1841          */
1842         cr_ses->flags &= ~SESSION4_PERSIST;
1843         cr_ses->flags &= ~SESSION4_RDMA;
1844
1845         init_session(rqstp, new, conf, cr_ses);
1846         nfsd4_init_conn(rqstp, conn, new);
1847
1848         memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1849                NFS4_MAX_SESSIONID_LEN);
1850         memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1851                 sizeof(struct nfsd4_channel_attrs));
1852         cs_slot->sl_seqid++;
1853         cr_ses->seqid = cs_slot->sl_seqid;
1854
1855         /* cache solo and embedded create sessions under the state lock */
1856         nfsd4_cache_create_session(cr_ses, cs_slot, status);
1857 out:
1858         nfs4_unlock_state();
1859         dprintk("%s returns %d\n", __func__, ntohl(status));
1860         return status;
1861 out_free_conn:
1862         free_conn(conn);
1863 out_free_session:
1864         __free_session(new);
1865         goto out;
1866 }
1867
1868 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1869 {
1870         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1871         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1872
1873         return argp->opcnt == resp->opcnt;
1874 }
1875
1876 static __be32 nfsd4_map_bcts_dir(u32 *dir)
1877 {
1878         switch (*dir) {
1879         case NFS4_CDFC4_FORE:
1880         case NFS4_CDFC4_BACK:
1881                 return nfs_ok;
1882         case NFS4_CDFC4_FORE_OR_BOTH:
1883         case NFS4_CDFC4_BACK_OR_BOTH:
1884                 *dir = NFS4_CDFC4_BOTH;
1885                 return nfs_ok;
1886         };
1887         return nfserr_inval;
1888 }
1889
1890 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
1891 {
1892         struct nfsd4_session *session = cstate->session;
1893
1894         spin_lock(&client_lock);
1895         session->se_cb_prog = bc->bc_cb_program;
1896         session->se_cb_sec = bc->bc_cb_sec;
1897         spin_unlock(&client_lock);
1898
1899         nfsd4_probe_callback(session->se_client);
1900
1901         return nfs_ok;
1902 }
1903
1904 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
1905                      struct nfsd4_compound_state *cstate,
1906                      struct nfsd4_bind_conn_to_session *bcts)
1907 {
1908         __be32 status;
1909         struct nfsd4_conn *conn;
1910
1911         if (!nfsd4_last_compound_op(rqstp))
1912                 return nfserr_not_only_op;
1913         spin_lock(&client_lock);
1914         cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
1915         /* Sorta weird: we only need the refcnt'ing because new_conn acquires
1916          * client_lock iself: */
1917         if (cstate->session) {
1918                 nfsd4_get_session(cstate->session);
1919                 atomic_inc(&cstate->session->se_client->cl_refcount);
1920         }
1921         spin_unlock(&client_lock);
1922         if (!cstate->session)
1923                 return nfserr_badsession;
1924
1925         status = nfsd4_map_bcts_dir(&bcts->dir);
1926         if (status)
1927                 return status;
1928         conn = alloc_conn(rqstp, bcts->dir);
1929         if (!conn)
1930                 return nfserr_jukebox;
1931         nfsd4_init_conn(rqstp, conn, cstate->session);
1932         return nfs_ok;
1933 }
1934
1935 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1936 {
1937         if (!session)
1938                 return 0;
1939         return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1940 }
1941
1942 __be32
1943 nfsd4_destroy_session(struct svc_rqst *r,
1944                       struct nfsd4_compound_state *cstate,
1945                       struct nfsd4_destroy_session *sessionid)
1946 {
1947         struct nfsd4_session *ses;
1948         __be32 status = nfserr_badsession;
1949
1950         /* Notes:
1951          * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1952          * - Should we return nfserr_back_chan_busy if waiting for
1953          *   callbacks on to-be-destroyed session?
1954          * - Do we need to clear any callback info from previous session?
1955          */
1956
1957         if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1958                 if (!nfsd4_last_compound_op(r))
1959                         return nfserr_not_only_op;
1960         }
1961         dump_sessionid(__func__, &sessionid->sessionid);
1962         spin_lock(&client_lock);
1963         ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1964         if (!ses) {
1965                 spin_unlock(&client_lock);
1966                 goto out;
1967         }
1968
1969         unhash_session(ses);
1970         spin_unlock(&client_lock);
1971
1972         nfs4_lock_state();
1973         nfsd4_probe_callback_sync(ses->se_client);
1974         nfs4_unlock_state();
1975
1976         spin_lock(&client_lock);
1977         nfsd4_del_conns(ses);
1978         nfsd4_put_session_locked(ses);
1979         spin_unlock(&client_lock);
1980         status = nfs_ok;
1981 out:
1982         dprintk("%s returns %d\n", __func__, ntohl(status));
1983         return status;
1984 }
1985
1986 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1987 {
1988         struct nfsd4_conn *c;
1989
1990         list_for_each_entry(c, &s->se_conns, cn_persession) {
1991                 if (c->cn_xprt == xpt) {
1992                         return c;
1993                 }
1994         }
1995         return NULL;
1996 }
1997
1998 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1999 {
2000         struct nfs4_client *clp = ses->se_client;
2001         struct nfsd4_conn *c;
2002         int ret;
2003
2004         spin_lock(&clp->cl_lock);
2005         c = __nfsd4_find_conn(new->cn_xprt, ses);
2006         if (c) {
2007                 spin_unlock(&clp->cl_lock);
2008                 free_conn(new);
2009                 return;
2010         }
2011         __nfsd4_hash_conn(new, ses);
2012         spin_unlock(&clp->cl_lock);
2013         ret = nfsd4_register_conn(new);
2014         if (ret)
2015                 /* oops; xprt is already down: */
2016                 nfsd4_conn_lost(&new->cn_xpt_user);
2017         return;
2018 }
2019
2020 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2021 {
2022         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2023
2024         return args->opcnt > session->se_fchannel.maxops;
2025 }
2026
2027 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2028                                   struct nfsd4_session *session)
2029 {
2030         struct xdr_buf *xb = &rqstp->rq_arg;
2031
2032         return xb->len > session->se_fchannel.maxreq_sz;
2033 }
2034
2035 __be32
2036 nfsd4_sequence(struct svc_rqst *rqstp,
2037                struct nfsd4_compound_state *cstate,
2038                struct nfsd4_sequence *seq)
2039 {
2040         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2041         struct nfsd4_session *session;
2042         struct nfsd4_slot *slot;
2043         struct nfsd4_conn *conn;
2044         __be32 status;
2045
2046         if (resp->opcnt != 1)
2047                 return nfserr_sequence_pos;
2048
2049         /*
2050          * Will be either used or freed by nfsd4_sequence_check_conn
2051          * below.
2052          */
2053         conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2054         if (!conn)
2055                 return nfserr_jukebox;
2056
2057         spin_lock(&client_lock);
2058         status = nfserr_badsession;
2059         session = find_in_sessionid_hashtbl(&seq->sessionid);
2060         if (!session)
2061                 goto out;
2062
2063         status = nfserr_too_many_ops;
2064         if (nfsd4_session_too_many_ops(rqstp, session))
2065                 goto out;
2066
2067         status = nfserr_req_too_big;
2068         if (nfsd4_request_too_big(rqstp, session))
2069                 goto out;
2070
2071         status = nfserr_badslot;
2072         if (seq->slotid >= session->se_fchannel.maxreqs)
2073                 goto out;
2074
2075         slot = session->se_slots[seq->slotid];
2076         dprintk("%s: slotid %d\n", __func__, seq->slotid);
2077
2078         /* We do not negotiate the number of slots yet, so set the
2079          * maxslots to the session maxreqs which is used to encode
2080          * sr_highest_slotid and the sr_target_slot id to maxslots */
2081         seq->maxslots = session->se_fchannel.maxreqs;
2082
2083         status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2084                                         slot->sl_flags & NFSD4_SLOT_INUSE);
2085         if (status == nfserr_replay_cache) {
2086                 status = nfserr_seq_misordered;
2087                 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2088                         goto out;
2089                 cstate->slot = slot;
2090                 cstate->session = session;
2091                 /* Return the cached reply status and set cstate->status
2092                  * for nfsd4_proc_compound processing */
2093                 status = nfsd4_replay_cache_entry(resp, seq);
2094                 cstate->status = nfserr_replay_cache;
2095                 goto out;
2096         }
2097         if (status)
2098                 goto out;
2099
2100         nfsd4_sequence_check_conn(conn, session);
2101         conn = NULL;
2102
2103         /* Success! bump slot seqid */
2104         slot->sl_seqid = seq->seqid;
2105         slot->sl_flags |= NFSD4_SLOT_INUSE;
2106         if (seq->cachethis)
2107                 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2108         else
2109                 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2110
2111         cstate->slot = slot;
2112         cstate->session = session;
2113
2114 out:
2115         /* Hold a session reference until done processing the compound. */
2116         if (cstate->session) {
2117                 struct nfs4_client *clp = session->se_client;
2118
2119                 nfsd4_get_session(cstate->session);
2120                 atomic_inc(&clp->cl_refcount);
2121                 switch (clp->cl_cb_state) {
2122                 case NFSD4_CB_DOWN:
2123                         seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2124                         break;
2125                 case NFSD4_CB_FAULT:
2126                         seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2127                         break;
2128                 default:
2129                         seq->status_flags = 0;
2130                 }
2131         }
2132         kfree(conn);
2133         spin_unlock(&client_lock);
2134         dprintk("%s: return %d\n", __func__, ntohl(status));
2135         return status;
2136 }
2137
2138 __be32
2139 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2140 {
2141         struct nfs4_client *conf, *unconf, *clp;
2142         __be32 status = 0;
2143         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2144
2145         nfs4_lock_state();
2146         unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2147         conf = find_confirmed_client(&dc->clientid, true, nn);
2148
2149         if (conf) {
2150                 clp = conf;
2151
2152                 if (!is_client_expired(conf) && client_has_state(conf)) {
2153                         status = nfserr_clientid_busy;
2154                         goto out;
2155                 }
2156
2157                 /* rfc5661 18.50.3 */
2158                 if (cstate->session && conf == cstate->session->se_client) {
2159                         status = nfserr_clientid_busy;
2160                         goto out;
2161                 }
2162         } else if (unconf)
2163                 clp = unconf;
2164         else {
2165                 status = nfserr_stale_clientid;
2166                 goto out;
2167         }
2168
2169         expire_client(clp);
2170 out:
2171         nfs4_unlock_state();
2172         dprintk("%s return %d\n", __func__, ntohl(status));
2173         return status;
2174 }
2175
2176 __be32
2177 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2178 {
2179         __be32 status = 0;
2180
2181         if (rc->rca_one_fs) {
2182                 if (!cstate->current_fh.fh_dentry)
2183                         return nfserr_nofilehandle;
2184                 /*
2185                  * We don't take advantage of the rca_one_fs case.
2186                  * That's OK, it's optional, we can safely ignore it.
2187                  */
2188                  return nfs_ok;
2189         }
2190
2191         nfs4_lock_state();
2192         status = nfserr_complete_already;
2193         if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2194                              &cstate->session->se_client->cl_flags))
2195                 goto out;
2196
2197         status = nfserr_stale_clientid;
2198         if (is_client_expired(cstate->session->se_client))
2199                 /*
2200                  * The following error isn't really legal.
2201                  * But we only get here if the client just explicitly
2202                  * destroyed the client.  Surely it no longer cares what
2203                  * error it gets back on an operation for the dead
2204                  * client.
2205                  */
2206                 goto out;
2207
2208         status = nfs_ok;
2209         nfsd4_client_record_create(cstate->session->se_client);
2210 out:
2211         nfs4_unlock_state();
2212         return status;
2213 }
2214
2215 __be32
2216 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2217                   struct nfsd4_setclientid *setclid)
2218 {
2219         struct xdr_netobj       clname = setclid->se_name;
2220         nfs4_verifier           clverifier = setclid->se_verf;
2221         struct nfs4_client      *conf, *unconf, *new;
2222         __be32                  status;
2223         struct nfsd_net         *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2224
2225         /* Cases below refer to rfc 3530 section 14.2.33: */
2226         nfs4_lock_state();
2227         conf = find_confirmed_client_by_name(&clname, nn);
2228         if (conf) {
2229                 /* case 0: */
2230                 status = nfserr_clid_inuse;
2231                 if (clp_used_exchangeid(conf))
2232                         goto out;
2233                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2234                         char addr_str[INET6_ADDRSTRLEN];
2235                         rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2236                                  sizeof(addr_str));
2237                         dprintk("NFSD: setclientid: string in use by client "
2238                                 "at %s\n", addr_str);
2239                         goto out;
2240                 }
2241         }
2242         unconf = find_unconfirmed_client_by_name(&clname);
2243         if (unconf)
2244                 expire_client(unconf);
2245         status = nfserr_jukebox;
2246         new = create_client(clname, rqstp, &clverifier);
2247         if (new == NULL)
2248                 goto out;
2249         if (conf && same_verf(&conf->cl_verifier, &clverifier))
2250                 /* case 1: probable callback update */
2251                 copy_clid(new, conf);
2252         else /* case 4 (new client) or cases 2, 3 (client reboot): */
2253                 gen_clid(new, nn);
2254         new->cl_minorversion = 0;
2255         gen_callback(new, setclid, rqstp);
2256         add_to_unconfirmed(new);
2257         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2258         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2259         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2260         status = nfs_ok;
2261 out:
2262         nfs4_unlock_state();
2263         return status;
2264 }
2265
2266
2267 __be32
2268 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
2269                          struct nfsd4_compound_state *cstate,
2270                          struct nfsd4_setclientid_confirm *setclientid_confirm)
2271 {
2272         struct nfs4_client *conf, *unconf;
2273         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
2274         clientid_t * clid = &setclientid_confirm->sc_clientid;
2275         __be32 status;
2276         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2277
2278         if (STALE_CLIENTID(clid, nn))
2279                 return nfserr_stale_clientid;
2280         nfs4_lock_state();
2281
2282         conf = find_confirmed_client(clid, false, nn);
2283         unconf = find_unconfirmed_client(clid, false, nn);
2284         /*
2285          * We try hard to give out unique clientid's, so if we get an
2286          * attempt to confirm the same clientid with a different cred,
2287          * there's a bug somewhere.  Let's charitably assume it's our
2288          * bug.
2289          */
2290         status = nfserr_serverfault;
2291         if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
2292                 goto out;
2293         if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
2294                 goto out;
2295         /* cases below refer to rfc 3530 section 14.2.34: */
2296         if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
2297                 if (conf && !unconf) /* case 2: probable retransmit */
2298                         status = nfs_ok;
2299                 else /* case 4: client hasn't noticed we rebooted yet? */
2300                         status = nfserr_stale_clientid;
2301                 goto out;
2302         }
2303         status = nfs_ok;
2304         if (conf) { /* case 1: callback update */
2305                 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
2306                 nfsd4_probe_callback(conf);
2307                 expire_client(unconf);
2308         } else { /* case 3: normal case; new or rebooted client */
2309                 conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
2310                 if (conf)
2311                         expire_client(conf);
2312                 move_to_confirmed(unconf);
2313                 nfsd4_probe_callback(unconf);
2314         }
2315 out:
2316         nfs4_unlock_state();
2317         return status;
2318 }
2319
2320 static struct nfs4_file *nfsd4_alloc_file(void)
2321 {
2322         return kmem_cache_alloc(file_slab, GFP_KERNEL);
2323 }
2324
2325 /* OPEN Share state helper functions */
2326 static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
2327 {
2328         unsigned int hashval = file_hashval(ino);
2329
2330         atomic_set(&fp->fi_ref, 1);
2331         INIT_LIST_HEAD(&fp->fi_hash);
2332         INIT_LIST_HEAD(&fp->fi_stateids);
2333         INIT_LIST_HEAD(&fp->fi_delegations);
2334         fp->fi_inode = igrab(ino);
2335         fp->fi_had_conflict = false;
2336         fp->fi_lease = NULL;
2337         memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2338         memset(fp->fi_access, 0, sizeof(fp->fi_access));
2339         spin_lock(&recall_lock);
2340         list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2341         spin_unlock(&recall_lock);
2342 }
2343
2344 static void
2345 nfsd4_free_slab(struct kmem_cache **slab)
2346 {
2347         if (*slab == NULL)
2348                 return;
2349         kmem_cache_destroy(*slab);
2350         *slab = NULL;
2351 }
2352
2353 void
2354 nfsd4_free_slabs(void)
2355 {
2356         nfsd4_free_slab(&openowner_slab);
2357         nfsd4_free_slab(&lockowner_slab);
2358         nfsd4_free_slab(&file_slab);
2359         nfsd4_free_slab(&stateid_slab);
2360         nfsd4_free_slab(&deleg_slab);
2361 }
2362
2363 int
2364 nfsd4_init_slabs(void)
2365 {
2366         openowner_slab = kmem_cache_create("nfsd4_openowners",
2367                         sizeof(struct nfs4_openowner), 0, 0, NULL);
2368         if (openowner_slab == NULL)
2369                 goto out_nomem;
2370         lockowner_slab = kmem_cache_create("nfsd4_lockowners",
2371                         sizeof(struct nfs4_lockowner), 0, 0, NULL);
2372         if (lockowner_slab == NULL)
2373                 goto out_nomem;
2374         file_slab = kmem_cache_create("nfsd4_files",
2375                         sizeof(struct nfs4_file), 0, 0, NULL);
2376         if (file_slab == NULL)
2377                 goto out_nomem;
2378         stateid_slab = kmem_cache_create("nfsd4_stateids",
2379                         sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
2380         if (stateid_slab == NULL)
2381                 goto out_nomem;
2382         deleg_slab = kmem_cache_create("nfsd4_delegations",
2383                         sizeof(struct nfs4_delegation), 0, 0, NULL);
2384         if (deleg_slab == NULL)
2385                 goto out_nomem;
2386         return 0;
2387 out_nomem:
2388         nfsd4_free_slabs();
2389         dprintk("nfsd4: out of memory while initializing nfsv4\n");
2390         return -ENOMEM;
2391 }
2392
2393 void nfs4_free_openowner(struct nfs4_openowner *oo)
2394 {
2395         kfree(oo->oo_owner.so_owner.data);
2396         kmem_cache_free(openowner_slab, oo);
2397 }
2398
2399 void nfs4_free_lockowner(struct nfs4_lockowner *lo)
2400 {
2401         kfree(lo->lo_owner.so_owner.data);
2402         kmem_cache_free(lockowner_slab, lo);
2403 }
2404
2405 static void init_nfs4_replay(struct nfs4_replay *rp)
2406 {
2407         rp->rp_status = nfserr_serverfault;
2408         rp->rp_buflen = 0;
2409         rp->rp_buf = rp->rp_ibuf;
2410 }
2411
2412 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
2413 {
2414         struct nfs4_stateowner *sop;
2415
2416         sop = kmem_cache_alloc(slab, GFP_KERNEL);
2417         if (!sop)
2418                 return NULL;
2419
2420         sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
2421         if (!sop->so_owner.data) {
2422                 kmem_cache_free(slab, sop);
2423                 return NULL;
2424         }
2425         sop->so_owner.len = owner->len;
2426
2427         INIT_LIST_HEAD(&sop->so_stateids);
2428         sop->so_client = clp;
2429         init_nfs4_replay(&sop->so_replay);
2430         return sop;
2431 }
2432
2433 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
2434 {
2435         list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
2436         list_add(&oo->oo_perclient, &clp->cl_openowners);
2437 }
2438
2439 static struct nfs4_openowner *
2440 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2441         struct nfs4_openowner *oo;
2442
2443         oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
2444         if (!oo)
2445                 return NULL;
2446         oo->oo_owner.so_is_open_owner = 1;
2447         oo->oo_owner.so_seqid = open->op_seqid;
2448         oo->oo_flags = NFS4_OO_NEW;
2449         oo->oo_time = 0;
2450         oo->oo_last_closed_stid = NULL;
2451         INIT_LIST_HEAD(&oo->oo_close_lru);
2452         hash_openowner(oo, clp, strhashval);
2453         return oo;
2454 }
2455
2456 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2457         struct nfs4_openowner *oo = open->op_openowner;
2458         struct nfs4_client *clp = oo->oo_owner.so_client;
2459
2460         init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
2461         INIT_LIST_HEAD(&stp->st_lockowners);
2462         list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
2463         list_add(&stp->st_perfile, &fp->fi_stateids);
2464         stp->st_stateowner = &oo->oo_owner;
2465         get_nfs4_file(fp);
2466         stp->st_file = fp;
2467         stp->st_access_bmap = 0;
2468         stp->st_deny_bmap = 0;
2469         set_access(open->op_share_access, stp);
2470         set_deny(open->op_share_deny, stp);
2471         stp->st_openstp = NULL;
2472 }
2473
2474 static void
2475 move_to_close_lru(struct nfs4_openowner *oo)
2476 {
2477         dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
2478
2479         list_move_tail(&oo->oo_close_lru, &close_lru);
2480         oo->oo_time = get_seconds();
2481 }
2482
2483 static int
2484 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2485                                                         clientid_t *clid)
2486 {
2487         return (sop->so_owner.len == owner->len) &&
2488                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2489                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2490 }
2491
2492 static struct nfs4_openowner *
2493 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, bool sessions)
2494 {
2495         struct nfs4_stateowner *so;
2496         struct nfs4_openowner *oo;
2497         struct nfs4_client *clp;
2498
2499         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2500                 if (!so->so_is_open_owner)
2501                         continue;
2502                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
2503                         oo = openowner(so);
2504                         clp = oo->oo_owner.so_client;
2505                         if ((bool)clp->cl_minorversion != sessions)
2506                                 return NULL;
2507                         renew_client(oo->oo_owner.so_client);
2508                         return oo;
2509                 }
2510         }
2511         return NULL;
2512 }
2513
2514 /* search file_hashtbl[] for file */
2515 static struct nfs4_file *
2516 find_file(struct inode *ino)
2517 {
2518         unsigned int hashval = file_hashval(ino);
2519         struct nfs4_file *fp;
2520
2521         spin_lock(&recall_lock);
2522         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2523                 if (fp->fi_inode == ino) {
2524                         get_nfs4_file(fp);
2525                         spin_unlock(&recall_lock);
2526                         return fp;
2527                 }
2528         }
2529         spin_unlock(&recall_lock);
2530         return NULL;
2531 }
2532
2533 /*
2534  * Called to check deny when READ with all zero stateid or
2535  * WRITE with all zero or all one stateid
2536  */
2537 static __be32
2538 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2539 {
2540         struct inode *ino = current_fh->fh_dentry->d_inode;
2541         struct nfs4_file *fp;
2542         struct nfs4_ol_stateid *stp;
2543         __be32 ret;
2544
2545         dprintk("NFSD: nfs4_share_conflict\n");
2546
2547         fp = find_file(ino);
2548         if (!fp)
2549                 return nfs_ok;
2550         ret = nfserr_locked;
2551         /* Search for conflicting share reservations */
2552         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2553                 if (test_deny(deny_type, stp) ||
2554                     test_deny(NFS4_SHARE_DENY_BOTH, stp))
2555                         goto out;
2556         }
2557         ret = nfs_ok;
2558 out:
2559         put_nfs4_file(fp);
2560         return ret;
2561 }
2562
2563 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
2564 {
2565         /* We're assuming the state code never drops its reference
2566          * without first removing the lease.  Since we're in this lease
2567          * callback (and since the lease code is serialized by the kernel
2568          * lock) we know the server hasn't removed the lease yet, we know
2569          * it's safe to take a reference: */
2570         atomic_inc(&dp->dl_count);
2571
2572         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2573
2574         /* only place dl_time is set. protected by lock_flocks*/
2575         dp->dl_time = get_seconds();
2576
2577         nfsd4_cb_recall(dp);
2578 }
2579
2580 /* Called from break_lease() with lock_flocks() held. */
2581 static void nfsd_break_deleg_cb(struct file_lock *fl)
2582 {
2583         struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
2584         struct nfs4_delegation *dp;
2585
2586         if (!fp) {
2587                 WARN(1, "(%p)->fl_owner NULL\n", fl);
2588                 return;
2589         }
2590         if (fp->fi_had_conflict) {
2591                 WARN(1, "duplicate break on %p\n", fp);
2592                 return;
2593         }
2594         /*
2595          * We don't want the locks code to timeout the lease for us;
2596          * we'll remove it ourself if a delegation isn't returned
2597          * in time:
2598          */
2599         fl->fl_break_time = 0;
2600
2601         spin_lock(&recall_lock);
2602         fp->fi_had_conflict = true;
2603         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
2604                 nfsd_break_one_deleg(dp);
2605         spin_unlock(&recall_lock);
2606 }
2607
2608 static
2609 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2610 {
2611         if (arg & F_UNLCK)
2612                 return lease_modify(onlist, arg);
2613         else
2614                 return -EAGAIN;
2615 }
2616
2617 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2618         .lm_break = nfsd_break_deleg_cb,
2619         .lm_change = nfsd_change_deleg_cb,
2620 };
2621
2622 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
2623 {
2624         if (nfsd4_has_session(cstate))
2625                 return nfs_ok;
2626         if (seqid == so->so_seqid - 1)
2627                 return nfserr_replay_me;
2628         if (seqid == so->so_seqid)
2629                 return nfs_ok;
2630         return nfserr_bad_seqid;
2631 }
2632
2633 __be32
2634 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2635                     struct nfsd4_open *open)
2636 {
2637         clientid_t *clientid = &open->op_clientid;
2638         struct nfs4_client *clp = NULL;
2639         unsigned int strhashval;
2640         struct nfs4_openowner *oo = NULL;
2641         __be32 status;
2642         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
2643
2644         if (STALE_CLIENTID(&open->op_clientid, nn))
2645                 return nfserr_stale_clientid;
2646         /*
2647          * In case we need it later, after we've already created the
2648          * file and don't want to risk a further failure:
2649          */
2650         open->op_file = nfsd4_alloc_file();
2651         if (open->op_file == NULL)
2652                 return nfserr_jukebox;
2653
2654         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
2655         oo = find_openstateowner_str(strhashval, open, cstate->minorversion);
2656         open->op_openowner = oo;
2657         if (!oo) {
2658                 clp = find_confirmed_client(clientid, cstate->minorversion,
2659                                             nn);
2660                 if (clp == NULL)
2661                         return nfserr_expired;
2662                 goto new_owner;
2663         }
2664         if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
2665                 /* Replace unconfirmed owners without checking for replay. */
2666                 clp = oo->oo_owner.so_client;
2667                 release_openowner(oo);
2668                 open->op_openowner = NULL;
2669                 goto new_owner;
2670         }
2671         status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
2672         if (status)
2673                 return status;
2674         clp = oo->oo_owner.so_client;
2675         goto alloc_stateid;
2676 new_owner:
2677         oo = alloc_init_open_stateowner(strhashval, clp, open);
2678         if (oo == NULL)
2679                 return nfserr_jukebox;
2680         open->op_openowner = oo;
2681 alloc_stateid:
2682         open->op_stp = nfs4_alloc_stateid(clp);
2683         if (!open->op_stp)
2684                 return nfserr_jukebox;
2685         return nfs_ok;
2686 }
2687
2688 static inline __be32
2689 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2690 {
2691         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2692                 return nfserr_openmode;
2693         else
2694                 return nfs_ok;
2695 }
2696
2697 static int share_access_to_flags(u32 share_access)
2698 {
2699         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2700 }
2701
2702 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
2703 {
2704         struct nfs4_stid *ret;
2705
2706         ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
2707         if (!ret)
2708                 return NULL;
2709         return delegstateid(ret);
2710 }
2711
2712 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
2713 {
2714         return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
2715                open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
2716 }
2717
2718 static __be32
2719 nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
2720                 struct nfs4_delegation **dp)
2721 {
2722         int flags;
2723         __be32 status = nfserr_bad_stateid;
2724
2725         *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
2726         if (*dp == NULL)
2727                 goto out;
2728         flags = share_access_to_flags(open->op_share_access);
2729         status = nfs4_check_delegmode(*dp, flags);
2730         if (status)
2731                 *dp = NULL;
2732 out:
2733         if (!nfsd4_is_deleg_cur(open))
2734                 return nfs_ok;
2735         if (status)
2736                 return status;
2737         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2738         return nfs_ok;
2739 }
2740
2741 static __be32
2742 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
2743 {
2744         struct nfs4_ol_stateid *local;
2745         struct nfs4_openowner *oo = open->op_openowner;
2746
2747         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2748                 /* ignore lock owners */
2749                 if (local->st_stateowner->so_is_open_owner == 0)
2750                         continue;
2751                 /* remember if we have seen this open owner */
2752                 if (local->st_stateowner == &oo->oo_owner)
2753                         *stpp = local;
2754                 /* check for conflicting share reservations */
2755                 if (!test_share(local, open))
2756                         return nfserr_share_denied;
2757         }
2758         return nfs_ok;
2759 }
2760
2761 static inline int nfs4_access_to_access(u32 nfs4_access)
2762 {
2763         int flags = 0;
2764
2765         if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2766                 flags |= NFSD_MAY_READ;
2767         if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2768                 flags |= NFSD_MAY_WRITE;
2769         return flags;
2770 }
2771
2772 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
2773                 struct svc_fh *cur_fh, struct nfsd4_open *open)
2774 {
2775         __be32 status;
2776         int oflag = nfs4_access_to_omode(open->op_share_access);
2777         int access = nfs4_access_to_access(open->op_share_access);
2778
2779         if (!fp->fi_fds[oflag]) {
2780                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2781                         &fp->fi_fds[oflag]);
2782                 if (status)
2783                         return status;
2784         }
2785         nfs4_file_get_access(fp, oflag);
2786
2787         return nfs_ok;
2788 }
2789
2790 static inline __be32
2791 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2792                 struct nfsd4_open *open)
2793 {
2794         struct iattr iattr = {
2795                 .ia_valid = ATTR_SIZE,
2796                 .ia_size = 0,
2797         };
2798         if (!open->op_truncate)
2799                 return 0;
2800         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2801                 return nfserr_inval;
2802         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2803 }
2804
2805 static __be32
2806 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)
2807 {
2808         u32 op_share_access = open->op_share_access;
2809         bool new_access;
2810         __be32 status;
2811
2812         new_access = !test_access(op_share_access, stp);
2813         if (new_access) {
2814                 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
2815                 if (status)
2816                         return status;
2817         }
2818         status = nfsd4_truncate(rqstp, cur_fh, open);
2819         if (status) {
2820                 if (new_access) {
2821                         int oflag = nfs4_access_to_omode(op_share_access);
2822                         nfs4_file_put_access(fp, oflag);
2823                 }
2824                 return status;
2825         }
2826         /* remember the open */
2827         set_access(op_share_access, stp);
2828         set_deny(open->op_share_deny, stp);
2829
2830         return nfs_ok;
2831 }
2832
2833
2834 static void
2835 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
2836 {
2837         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
2838 }
2839
2840 /* Should we give out recallable state?: */
2841 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
2842 {
2843         if (clp->cl_cb_state == NFSD4_CB_UP)
2844                 return true;
2845         /*
2846          * In the sessions case, since we don't have to establish a
2847          * separate connection for callbacks, we assume it's OK
2848          * until we hear otherwise:
2849          */
2850         return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
2851 }
2852
2853 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
2854 {
2855         struct file_lock *fl;
2856
2857         fl = locks_alloc_lock();
2858         if (!fl)
2859                 return NULL;
2860         locks_init_lock(fl);
2861         fl->fl_lmops = &nfsd_lease_mng_ops;
2862         fl->fl_flags = FL_LEASE;
2863         fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2864         fl->fl_end = OFFSET_MAX;
2865         fl->fl_owner = (fl_owner_t)(dp->dl_file);
2866         fl->fl_pid = current->tgid;
2867         return fl;
2868 }
2869
2870 static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
2871 {
2872         struct nfs4_file *fp = dp->dl_file;
2873         struct file_lock *fl;
2874         int status;
2875
2876         fl = nfs4_alloc_init_lease(dp, flag);
2877         if (!fl)
2878                 return -ENOMEM;
2879         fl->fl_file = find_readable_file(fp);
2880         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2881         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
2882         if (status) {
2883                 list_del_init(&dp->dl_perclnt);
2884                 locks_free_lock(fl);
2885                 return -ENOMEM;
2886         }
2887         fp->fi_lease = fl;
2888         fp->fi_deleg_file = get_file(fl->fl_file);
2889         atomic_set(&fp->fi_delegees, 1);
2890         list_add(&dp->dl_perfile, &fp->fi_delegations);
2891         return 0;
2892 }
2893
2894 static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
2895 {
2896         struct nfs4_file *fp = dp->dl_file;
2897
2898         if (!fp->fi_lease)
2899                 return nfs4_setlease(dp, flag);
2900         spin_lock(&recall_lock);
2901         if (fp->fi_had_conflict) {
2902                 spin_unlock(&recall_lock);
2903                 return -EAGAIN;
2904         }
2905         atomic_inc(&fp->fi_delegees);
2906         list_add(&dp->dl_perfile, &fp->fi_delegations);
2907         spin_unlock(&recall_lock);
2908         list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
2909         return 0;
2910 }
2911
2912 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
2913 {
2914         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
2915         if (status == -EAGAIN)
2916                 open->op_why_no_deleg = WND4_CONTENTION;
2917         else {
2918                 open->op_why_no_deleg = WND4_RESOURCE;
2919                 switch (open->op_deleg_want) {
2920                 case NFS4_SHARE_WANT_READ_DELEG:
2921                 case NFS4_SHARE_WANT_WRITE_DELEG:
2922                 case NFS4_SHARE_WANT_ANY_DELEG:
2923                         break;
2924                 case NFS4_SHARE_WANT_CANCEL:
2925                         open->op_why_no_deleg = WND4_CANCELLED;
2926                         break;
2927                 case NFS4_SHARE_WANT_NO_DELEG:
2928                         BUG();  /* not supposed to get here */
2929                 }
2930         }
2931 }
2932
2933 /*
2934  * Attempt to hand out a delegation.
2935  */
2936 static void
2937 nfs4_open_delegation(struct net *net, struct svc_fh *fh,
2938                      struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
2939 {
2940         struct nfs4_delegation *dp;
2941         struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
2942         int cb_up;
2943         int status = 0, flag = 0;
2944
2945         cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
2946         flag = NFS4_OPEN_DELEGATE_NONE;
2947         open->op_recall = 0;
2948         switch (open->op_claim_type) {
2949                 case NFS4_OPEN_CLAIM_PREVIOUS:
2950                         if (!cb_up)
2951                                 open->op_recall = 1;
2952                         flag = open->op_delegate_type;
2953                         if (flag == NFS4_OPEN_DELEGATE_NONE)
2954                                 goto out;
2955                         break;
2956                 case NFS4_OPEN_CLAIM_NULL:
2957                         /* Let's not give out any delegations till everyone's
2958                          * had the chance to reclaim theirs.... */
2959                         if (locks_in_grace(net))
2960                                 goto out;
2961                         if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
2962                                 goto out;
2963                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2964                                 flag = NFS4_OPEN_DELEGATE_WRITE;
2965                         else
2966                                 flag = NFS4_OPEN_DELEGATE_READ;
2967                         break;
2968                 default:
2969                         goto out;
2970         }
2971
2972         dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag);
2973         if (dp == NULL)
2974                 goto out_no_deleg;
2975         status = nfs4_set_delegation(dp, flag);
2976         if (status)
2977                 goto out_free;
2978
2979         memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
2980
2981         dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2982                 STATEID_VAL(&dp->dl_stid.sc_stateid));
2983 out:
2984         open->op_delegate_type = flag;
2985         if (flag == NFS4_OPEN_DELEGATE_NONE) {
2986                 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
2987                     open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2988                         dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2989
2990                 /* 4.1 client asking for a delegation? */
2991                 if (open->op_deleg_want)
2992                         nfsd4_open_deleg_none_ext(open, status);
2993         }
2994         return;
2995 out_free:
2996         nfs4_put_delegation(dp);
2997 out_no_deleg:
2998         flag = NFS4_OPEN_DELEGATE_NONE;
2999         goto out;
3000 }
3001
3002 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3003                                         struct nfs4_delegation *dp)
3004 {
3005         if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3006             dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3007                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3008                 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3009         } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
3010                    dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3011                 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3012                 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
3013         }
3014         /* Otherwise the client must be confused wanting a delegation
3015          * it already has, therefore we don't return
3016          * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
3017          */
3018 }
3019
3020 /*
3021  * called with nfs4_lock_state() held.
3022  */
3023 __be32
3024 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
3025 {
3026         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3027         struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
3028         struct nfs4_file *fp = NULL;
3029         struct inode *ino = current_fh->fh_dentry->d_inode;
3030         struct nfs4_ol_stateid *stp = NULL;
3031         struct nfs4_delegation *dp = NULL;
3032         __be32 status;
3033
3034         /*
3035          * Lookup file; if found, lookup stateid and check open request,
3036          * and check for delegations in the process of being recalled.
3037          * If not found, create the nfs4_file struct
3038          */
3039         fp = find_file(ino);
3040         if (fp) {
3041                 if ((status = nfs4_check_open(fp, open, &stp)))
3042                         goto out;
3043                 status = nfs4_check_deleg(cl, fp, open, &dp);
3044                 if (status)
3045                         goto out;
3046         } else {
3047                 status = nfserr_bad_stateid;
3048                 if (nfsd4_is_deleg_cur(open))
3049                         goto out;
3050                 status = nfserr_jukebox;
3051                 fp = open->op_file;
3052                 open->op_file = NULL;
3053                 nfsd4_init_file(fp, ino);
3054         }
3055
3056         /*
3057          * OPEN the file, or upgrade an existing OPEN.
3058          * If truncate fails, the OPEN fails.
3059          */
3060         if (stp) {
3061                 /* Stateid was found, this is an OPEN upgrade */
3062                 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
3063                 if (status)
3064                         goto out;
3065         } else {
3066                 status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
3067                 if (status)
3068                         goto out;
3069                 status = nfsd4_truncate(rqstp, current_fh, open);
3070                 if (status)
3071                         goto out;
3072                 stp = open->op_stp;
3073                 open->op_stp = NULL;
3074                 init_open_stateid(stp, fp, open);
3075         }
3076         update_stateid(&stp->st_stid.sc_stateid);
3077         memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3078
3079         if (nfsd4_has_session(&resp->cstate)) {
3080                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3081
3082                 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
3083                         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3084                         open->op_why_no_deleg = WND4_NOT_WANTED;
3085                         goto nodeleg;
3086                 }
3087         }
3088
3089         /*
3090         * Attempt to hand out a delegation. No error return, because the
3091         * OPEN succeeds even if we fail.
3092         */
3093         nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
3094 nodeleg:
3095         status = nfs_ok;
3096
3097         dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
3098                 STATEID_VAL(&stp->st_stid.sc_stateid));
3099 out:
3100         /* 4.1 client trying to upgrade/downgrade delegation? */
3101         if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
3102             open->op_deleg_want)
3103                 nfsd4_deleg_xgrade_none_ext(open, dp);
3104
3105         if (fp)
3106                 put_nfs4_file(fp);
3107         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
3108                 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
3109         /*
3110         * To finish the open response, we just need to set the rflags.
3111         */
3112         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
3113         if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
3114             !nfsd4_has_session(&resp->cstate))
3115                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
3116
3117         return status;
3118 }
3119
3120 void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
3121 {
3122         if (open->op_openowner) {
3123                 struct nfs4_openowner *oo = open->op_openowner;
3124
3125                 if (!list_empty(&oo->oo_owner.so_stateids))
3126                         list_del_init(&oo->oo_close_lru);
3127                 if (oo->oo_flags & NFS4_OO_NEW) {
3128                         if (status) {
3129                                 release_openowner(oo);
3130                                 open->op_openowner = NULL;
3131                         } else
3132                                 oo->oo_flags &= ~NFS4_OO_NEW;
3133                 }
3134         }
3135         if (open->op_file)
3136                 nfsd4_free_file(open->op_file);
3137         if (open->op_stp)
3138                 free_generic_stateid(open->op_stp);
3139 }
3140
3141 __be32
3142 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3143             clientid_t *clid)
3144 {
3145         struct nfs4_client *clp;
3146         __be32 status;
3147         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3148
3149         nfs4_lock_state();
3150         dprintk("process_renew(%08x/%08x): starting\n",
3151                         clid->cl_boot, clid->cl_id);
3152         status = nfserr_stale_clientid;
3153         if (STALE_CLIENTID(clid, nn))
3154                 goto out;
3155         clp = find_confirmed_client(clid, cstate->minorversion, nn);
3156         status = nfserr_expired;
3157         if (clp == NULL) {
3158                 /* We assume the client took too long to RENEW. */
3159                 dprintk("nfsd4_renew: clientid not found!\n");
3160                 goto out;
3161         }
3162         status = nfserr_cb_path_down;
3163         if (!list_empty(&clp->cl_delegations)
3164                         && clp->cl_cb_state != NFSD4_CB_UP)
3165                 goto out;
3166         status = nfs_ok;
3167 out:
3168         nfs4_unlock_state();
3169         return status;
3170 }
3171
3172 static void
3173 nfsd4_end_grace(struct net *net)
3174 {
3175         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3176
3177         /* do nothing if grace period already ended */
3178         if (nn->grace_ended)
3179                 return;
3180
3181         dprintk("NFSD: end of grace period\n");
3182         nn->grace_ended = true;
3183         nfsd4_record_grace_done(net, nn->boot_time);
3184         locks_end_grace(&nn->nfsd4_manager);
3185         /*
3186          * Now that every NFSv4 client has had the chance to recover and
3187          * to see the (possibly new, possibly shorter) lease time, we
3188          * can safely set the next grace time to the current lease time:
3189          */
3190         nfsd4_grace = nfsd4_lease;
3191 }
3192
3193 static time_t
3194 nfs4_laundromat(void)
3195 {
3196         struct nfs4_client *clp;
3197         struct nfs4_openowner *oo;
3198         struct nfs4_delegation *dp;
3199         struct list_head *pos, *next, reaplist;
3200         time_t cutoff = get_seconds() - nfsd4_lease;
3201         time_t t, clientid_val = nfsd4_lease;
3202         time_t u, test_val = nfsd4_lease;
3203
3204         nfs4_lock_state();
3205
3206         dprintk("NFSD: laundromat service - starting\n");
3207         nfsd4_end_grace(&init_net);
3208         INIT_LIST_HEAD(&reaplist);
3209         spin_lock(&client_lock);
3210         list_for_each_safe(pos, next, &client_lru) {
3211                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3212                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
3213                         t = clp->cl_time - cutoff;
3214                         if (clientid_val > t)
3215                                 clientid_val = t;
3216                         break;
3217                 }
3218                 if (atomic_read(&clp->cl_refcount)) {
3219                         dprintk("NFSD: client in use (clientid %08x)\n",
3220                                 clp->cl_clientid.cl_id);
3221                         continue;
3222                 }
3223                 unhash_client_locked(clp);
3224                 list_add(&clp->cl_lru, &reaplist);
3225         }
3226         spin_unlock(&client_lock);
3227         list_for_each_safe(pos, next, &reaplist) {
3228                 clp = list_entry(pos, struct nfs4_client, cl_lru);
3229                 dprintk("NFSD: purging unused client (clientid %08x)\n",
3230                         clp->cl_clientid.cl_id);
3231                 expire_client(clp);
3232         }
3233         spin_lock(&recall_lock);
3234         list_for_each_safe(pos, next, &del_recall_lru) {
3235                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3236                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
3237                         u = dp->dl_time - cutoff;
3238                         if (test_val > u)
3239                                 test_val = u;
3240                         break;
3241                 }
3242                 list_move(&dp->dl_recall_lru, &reaplist);
3243         }
3244         spin_unlock(&recall_lock);
3245         list_for_each_safe(pos, next, &reaplist) {
3246                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3247                 unhash_delegation(dp);
3248         }
3249         test_val = nfsd4_lease;
3250         list_for_each_safe(pos, next, &close_lru) {
3251                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
3252                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
3253                         u = oo->oo_time - cutoff;
3254                         if (test_val > u)
3255                                 test_val = u;
3256                         break;
3257                 }
3258                 release_openowner(oo);
3259         }
3260         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
3261                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
3262         nfs4_unlock_state();
3263         return clientid_val;
3264 }
3265
3266 static struct workqueue_struct *laundry_wq;
3267 static void laundromat_main(struct work_struct *);
3268 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
3269
3270 static void
3271 laundromat_main(struct work_struct *not_used)
3272 {
3273         time_t t;
3274
3275         t = nfs4_laundromat();
3276         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
3277         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
3278 }
3279
3280 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
3281 {
3282         if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
3283                 return nfserr_bad_stateid;
3284         return nfs_ok;
3285 }
3286
3287 static int
3288 STALE_STATEID(stateid_t *stateid, struct nfsd_net *nn)
3289 {
3290         if (stateid->si_opaque.so_clid.cl_boot == nn->boot_time)
3291                 return 0;
3292         dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
3293                 STATEID_VAL(stateid));
3294         return 1;
3295 }
3296
3297 static inline int
3298 access_permit_read(struct nfs4_ol_stateid *stp)
3299 {
3300         return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
3301                 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
3302                 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
3303 }
3304
3305 static inline int
3306 access_permit_write(struct nfs4_ol_stateid *stp)
3307 {
3308         return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
3309                 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
3310 }
3311
3312 static
3313 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
3314 {
3315         __be32 status = nfserr_openmode;
3316
3317         /* For lock stateid's, we test the parent open, not the lock: */
3318         if (stp->st_openstp)
3319                 stp = stp->st_openstp;
3320         if ((flags & WR_STATE) && !access_permit_write(stp))
3321                 goto out;
3322         if ((flags & RD_STATE) && !access_permit_read(stp))
3323                 goto out;
3324         status = nfs_ok;
3325 out:
3326         return status;
3327 }
3328
3329 static inline __be32
3330 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
3331 {
3332         if (ONE_STATEID(stateid) && (flags & RD_STATE))
3333                 return nfs_ok;
3334         else if (locks_in_grace(net)) {
3335                 /* Answer in remaining cases depends on existence of
3336                  * conflicting state; so we must wait out the grace period. */
3337                 return nfserr_grace;
3338         } else if (flags & WR_STATE)
3339                 return nfs4_share_conflict(current_fh,
3340                                 NFS4_SHARE_DENY_WRITE);
3341         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
3342                 return nfs4_share_conflict(current_fh,
3343                                 NFS4_SHARE_DENY_READ);
3344 }
3345
3346 /*
3347  * Allow READ/WRITE during grace period on recovered state only for files
3348  * that are not able to provide mandatory locking.
3349  */
3350 static inline int
3351 grace_disallows_io(struct net *net, struct inode *inode)
3352 {
3353         return locks_in_grace(net) && mandatory_lock(inode);
3354 }
3355
3356 /* Returns true iff a is later than b: */
3357 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
3358 {
3359         return (s32)a->si_generation - (s32)b->si_generation > 0;
3360 }
3361
3362 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
3363 {
3364         /*
3365          * When sessions are used the stateid generation number is ignored
3366          * when it is zero.
3367          */
3368         if (has_session && in->si_generation == 0)
3369                 return nfs_ok;
3370
3371         if (in->si_generation == ref->si_generation)
3372                 return nfs_ok;
3373
3374         /* If the client sends us a stateid from the future, it's buggy: */
3375         if (stateid_generation_after(in, ref))
3376                 return nfserr_bad_stateid;
3377         /*
3378          * However, we could see a stateid from the past, even from a
3379          * non-buggy client.  For example, if the client sends a lock
3380          * while some IO is outstanding, the lock may bump si_generation
3381          * while the IO is still in flight.  The client could avoid that
3382          * situation by waiting for responses on all the IO requests,
3383          * but better performance may result in retrying IO that
3384          * receives an old_stateid error if requests are rarely
3385          * reordered in flight:
3386          */
3387         return nfserr_old_stateid;
3388 }
3389
3390 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
3391 {
3392         struct nfs4_stid *s;
3393         struct nfs4_ol_stateid *ols;
3394         __be32 status;
3395
3396         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3397                 return nfserr_bad_stateid;
3398         /* Client debugging aid. */
3399         if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
3400                 char addr_str[INET6_ADDRSTRLEN];
3401                 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
3402                                  sizeof(addr_str));
3403                 pr_warn_ratelimited("NFSD: client %s testing state ID "
3404                                         "with incorrect client ID\n", addr_str);
3405                 return nfserr_bad_stateid;
3406         }
3407         s = find_stateid(cl, stateid);
3408         if (!s)
3409                 return nfserr_bad_stateid;
3410         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
3411         if (status)
3412                 return status;
3413         if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
3414                 return nfs_ok;
3415         ols = openlockstateid(s);
3416         if (ols->st_stateowner->so_is_open_owner
3417             && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3418                 return nfserr_bad_stateid;
3419         return nfs_ok;
3420 }
3421
3422 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s, bool sessions)
3423 {
3424         struct nfs4_client *cl;
3425         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
3426
3427         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3428                 return nfserr_bad_stateid;
3429         if (STALE_STATEID(stateid, nn))
3430                 return nfserr_stale_stateid;
3431         cl = find_confirmed_client(&stateid->si_opaque.so_clid, sessions, nn);
3432         if (!cl)
3433                 return nfserr_expired;
3434         *s = find_stateid_by_type(cl, stateid, typemask);
3435         if (!*s)
3436                 return nfserr_bad_stateid;
3437         return nfs_ok;
3438
3439 }
3440
3441 /*
3442 * Checks for stateid operations
3443 */
3444 __be32
3445 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
3446                            stateid_t *stateid, int flags, struct file **filpp)
3447 {
3448         struct nfs4_stid *s;
3449         struct nfs4_ol_stateid *stp = NULL;
3450         struct nfs4_delegation *dp = NULL;
3451         struct svc_fh *current_fh = &cstate->current_fh;
3452         struct inode *ino = current_fh->fh_dentry->d_inode;
3453         __be32 status;
3454
3455         if (filpp)
3456                 *filpp = NULL;
3457
3458         if (grace_disallows_io(net, ino))
3459                 return nfserr_grace;
3460
3461         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3462                 return check_special_stateids(net, current_fh, stateid, flags);
3463
3464         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s, cstate->minorversion);
3465         if (status)
3466                 return status;
3467         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
3468         if (status)
3469                 goto out;
3470         switch (s->sc_type) {
3471         case NFS4_DELEG_STID:
3472                 dp = delegstateid(s);
3473                 status = nfs4_check_delegmode(dp, flags);
3474                 if (status)
3475                         goto out;
3476                 if (filpp) {
3477                         *filpp = dp->dl_file->fi_deleg_file;
3478                         BUG_ON(!*filpp);
3479                 }
3480                 break;
3481         case NFS4_OPEN_STID:
3482         case NFS4_LOCK_STID:
3483                 stp = openlockstateid(s);
3484                 status = nfs4_check_fh(current_fh, stp);
3485                 if (status)
3486                         goto out;
3487                 if (stp->st_stateowner->so_is_open_owner
3488                     && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
3489                         goto out;
3490                 status = nfs4_check_openmode(stp, flags);
3491                 if (status)
3492                         goto out;
3493                 if (filpp) {
3494                         if (flags & RD_STATE)
3495                                 *filpp = find_readable_file(stp->st_file);
3496                         else
3497                                 *filpp = find_writeable_file(stp->st_file);
3498                 }
3499                 break;
3500         default:
3501                 return nfserr_bad_stateid;
3502         }
3503         status = nfs_ok;
3504 out:
3505         return status;
3506 }
3507
3508 static __be32
3509 nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
3510 {
3511         if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
3512                 return nfserr_locks_held;
3513         release_lock_stateid(stp);
3514         return nfs_ok;
3515 }
3516
3517 /*
3518  * Test if the stateid is valid
3519  */
3520 __be32
3521 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3522                    struct nfsd4_test_stateid *test_stateid)
3523 {
3524         struct nfsd4_test_stateid_id *stateid;
3525         struct nfs4_client *cl = cstate->session->se_client;
3526
3527         nfs4_lock_state();
3528         list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
3529                 stateid->ts_id_status =
3530                         nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
3531         nfs4_unlock_state();
3532
3533         return nfs_ok;
3534 }
3535
3536 __be32
3537 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3538                    struct nfsd4_free_stateid *free_stateid)
3539 {
3540         stateid_t *stateid = &free_stateid->fr_stateid;
3541         struct nfs4_stid *s;
3542         struct nfs4_client *cl = cstate->session->se_client;
3543         __be32 ret = nfserr_bad_stateid;
3544
3545         nfs4_lock_state();
3546         s = find_stateid(cl, stateid);
3547         if (!s)
3548                 goto out;
3549         switch (s->sc_type) {
3550         case NFS4_DELEG_STID:
3551                 ret = nfserr_locks_held;
3552                 goto out;
3553         case NFS4_OPEN_STID:
3554         case NFS4_LOCK_STID:
3555                 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
3556                 if (ret)
3557                         goto out;
3558                 if (s->sc_type == NFS4_LOCK_STID)
3559                         ret = nfsd4_free_lock_stateid(openlockstateid(s));
3560                 else
3561                         ret = nfserr_locks_held;
3562                 break;
3563         default:
3564                 ret = nfserr_bad_stateid;
3565         }
3566 out:
3567         nfs4_unlock_state();
3568         return ret;
3569 }
3570
3571 static inline int
3572 setlkflg (int type)
3573 {
3574         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3575                 RD_STATE : WR_STATE;
3576 }
3577
3578 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
3579 {
3580         struct svc_fh *current_fh = &cstate->current_fh;
3581         struct nfs4_stateowner *sop = stp->st_stateowner;
3582         __be32 status;
3583
3584         status = nfsd4_check_seqid(cstate, sop, seqid);
3585         if (status)
3586                 return status;
3587         if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
3588                 /*
3589                  * "Closed" stateid's exist *only* to return
3590                  * nfserr_replay_me from the previous step.
3591                  */
3592                 return nfserr_bad_stateid;
3593         status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
3594         if (status)
3595                 return status;
3596         return nfs4_check_fh(current_fh, stp);
3597 }
3598
3599 /*
3600  * Checks for sequence id mutating operations.
3601  */
3602 static __be32
3603 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3604                          stateid_t *stateid, char typemask,
3605                          struct nfs4_ol_stateid **stpp)
3606 {
3607         __be32 status;
3608         struct nfs4_stid *s;
3609
3610         dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3611                 seqid, STATEID_VAL(stateid));
3612
3613         *stpp = NULL;
3614         status = nfsd4_lookup_stateid(stateid, typemask, &s, cstate->minorversion);
3615         if (status)
3616                 return status;
3617         *stpp = openlockstateid(s);
3618         cstate->replay_owner = (*stpp)->st_stateowner;
3619
3620         return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
3621 }
3622
3623 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
3624 {
3625         __be32 status;
3626         struct nfs4_openowner *oo;
3627
3628         status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
3629                                                 NFS4_OPEN_STID, stpp);
3630         if (status)
3631                 return status;
3632         oo = openowner((*stpp)->st_stateowner);
3633         if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
3634                 return nfserr_bad_stateid;
3635         return nfs_ok;
3636 }
3637
3638 __be32
3639 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3640                    struct nfsd4_open_confirm *oc)
3641 {
3642         __be32 status;
3643         struct nfs4_openowner *oo;
3644         struct nfs4_ol_stateid *stp;
3645
3646         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3647                         (int)cstate->current_fh.fh_dentry->d_name.len,
3648                         cstate->current_fh.fh_dentry->d_name.name);
3649
3650         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3651         if (status)
3652                 return status;
3653
3654         nfs4_lock_state();
3655
3656         status = nfs4_preprocess_seqid_op(cstate,
3657                                         oc->oc_seqid, &oc->oc_req_stateid,
3658                                         NFS4_OPEN_STID, &stp);
3659         if (status)
3660                 goto out;
3661         oo = openowner(stp->st_stateowner);
3662         status = nfserr_bad_stateid;
3663         if (oo->oo_flags & NFS4_OO_CONFIRMED)
3664                 goto out;
3665         oo->oo_flags |= NFS4_OO_CONFIRMED;
3666         update_stateid(&stp->st_stid.sc_stateid);
3667         memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3668         dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3669                 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
3670
3671         nfsd4_client_record_create(oo->oo_owner.so_client);
3672         status = nfs_ok;
3673 out:
3674         if (!cstate->replay_owner)
3675                 nfs4_unlock_state();
3676         return status;
3677 }
3678
3679 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
3680 {
3681         if (!test_access(access, stp))
3682                 return;
3683         nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
3684         clear_access(access, stp);
3685 }
3686
3687 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
3688 {
3689         switch (to_access) {
3690         case NFS4_SHARE_ACCESS_READ:
3691                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
3692                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3693                 break;
3694         case NFS4_SHARE_ACCESS_WRITE:
3695                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
3696                 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
3697                 break;
3698         case NFS4_SHARE_ACCESS_BOTH:
3699                 break;
3700         default:
3701                 BUG();
3702         }
3703 }
3704
3705 static void
3706 reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp)
3707 {
3708         int i;
3709         for (i = 0; i < 4; i++) {
3710                 if ((i & deny) != i)
3711                         clear_deny(i, stp);
3712         }
3713 }
3714
3715 __be32
3716 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3717                      struct nfsd4_compound_state *cstate,
3718                      struct nfsd4_open_downgrade *od)
3719 {
3720         __be32 status;
3721         struct nfs4_ol_stateid *stp;
3722
3723         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3724                         (int)cstate->current_fh.fh_dentry->d_name.len,
3725                         cstate->current_fh.fh_dentry->d_name.name);
3726
3727         /* We don't yet support WANT bits: */
3728         if (od->od_deleg_want)
3729                 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
3730                         od->od_deleg_want);
3731
3732         nfs4_lock_state();
3733         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
3734                                         &od->od_stateid, &stp);
3735         if (status)
3736                 goto out;
3737         status = nfserr_inval;
3738         if (!test_access(od->od_share_access, stp)) {
3739                 dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n",
3740                         stp->st_access_bmap, od->od_share_access);
3741                 goto out;
3742         }
3743         if (!test_deny(od->od_share_deny, stp)) {
3744                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3745                         stp->st_deny_bmap, od->od_share_deny);
3746                 goto out;
3747         }
3748         nfs4_stateid_downgrade(stp, od->od_share_access);
3749
3750         reset_union_bmap_deny(od->od_share_deny, stp);
3751
3752         update_stateid(&stp->st_stid.sc_stateid);
3753         memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3754         status = nfs_ok;
3755 out:
3756         if (!cstate->replay_owner)
3757                 nfs4_unlock_state();
3758         return status;
3759 }
3760
3761 void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
3762 {
3763         struct nfs4_openowner *oo;
3764         struct nfs4_ol_stateid *s;
3765
3766         if (!so->so_is_open_owner)
3767                 return;
3768         oo = openowner(so);
3769         s = oo->oo_last_closed_stid;
3770         if (!s)
3771                 return;
3772         if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
3773                 /* Release the last_closed_stid on the next seqid bump: */
3774                 oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
3775                 return;
3776         }
3777         oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
3778         release_last_closed_stateid(oo);
3779 }
3780
3781 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
3782 {
3783         unhash_open_stateid(s);
3784         s->st_stid.sc_type = NFS4_CLOSED_STID;
3785 }
3786
3787 /*
3788  * nfs4_unlock_state() called after encode
3789  */
3790 __be32
3791 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3792             struct nfsd4_close *close)
3793 {
3794         __be32 status;
3795         struct nfs4_openowner *oo;
3796         struct nfs4_ol_stateid *stp;
3797
3798         dprintk("NFSD: nfsd4_close on file %.*s\n",
3799                         (int)cstate->current_fh.fh_dentry->d_name.len,
3800                         cstate->current_fh.fh_dentry->d_name.name);
3801
3802         nfs4_lock_state();
3803         status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
3804                                         &close->cl_stateid,
3805                                         NFS4_OPEN_STID|NFS4_CLOSED_STID,
3806                                         &stp);
3807         if (status)
3808                 goto out;
3809         oo = openowner(stp->st_stateowner);
3810         status = nfs_ok;
3811         update_stateid(&stp->st_stid.sc_stateid);
3812         memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
3813
3814         nfsd4_close_open_stateid(stp);
3815         release_last_closed_stateid(oo);
3816         oo->oo_last_closed_stid = stp;
3817
3818         if (list_empty(&oo->oo_owner.so_stateids)) {
3819                 if (cstate->minorversion) {
3820                         release_openowner(oo);
3821                         cstate->replay_owner = NULL;
3822                 } else {
3823                         /*
3824                          * In the 4.0 case we need to keep the owners around a
3825                          * little while to handle CLOSE replay.
3826                          */
3827                         if (list_empty(&oo->oo_owner.so_stateids))
3828                                 move_to_close_lru(oo);
3829                 }
3830         }
3831 out:
3832         if (!cstate->replay_owner)
3833                 nfs4_unlock_state();
3834         return status;
3835 }
3836
3837 __be32
3838 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3839                   struct nfsd4_delegreturn *dr)
3840 {
3841         struct nfs4_delegation *dp;
3842         stateid_t *stateid = &dr->dr_stateid;
3843         struct nfs4_stid *s;
3844         __be32 status;
3845
3846         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3847                 return status;
3848
3849         nfs4_lock_state();
3850         status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s, cstate->minorversion);
3851         if (status)
3852                 goto out;
3853         dp = delegstateid(s);
3854         status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
3855         if (status)
3856                 goto out;
3857
3858         unhash_delegation(dp);
3859 out:
3860         nfs4_unlock_state();
3861
3862         return status;
3863 }
3864
3865
3866 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
3867
3868 #define LOCKOWNER_INO_HASH_BITS 8
3869 #define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
3870 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
3871
3872 static inline u64
3873 end_offset(u64 start, u64 len)
3874 {
3875         u64 end;
3876
3877         end = start + len;
3878         return end >= start ? end: NFS4_MAX_UINT64;
3879 }
3880
3881 /* last octet in a range */
3882 static inline u64
3883 last_byte_offset(u64 start, u64 len)
3884 {
3885         u64 end;
3886
3887         BUG_ON(!len);
3888         end = start + len;
3889         return end > start ? end - 1: NFS4_MAX_UINT64;
3890 }
3891
3892 static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
3893 {
3894         return (file_hashval(inode) + cl_id
3895                         + opaque_hashval(ownername->data, ownername->len))
3896                 & LOCKOWNER_INO_HASH_MASK;
3897 }
3898
3899 static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
3900
3901 /*
3902  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3903  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3904  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
3905  * locking, this prevents us from being completely protocol-compliant.  The
3906  * real solution to this problem is to start using unsigned file offsets in
3907  * the VFS, but this is a very deep change!
3908  */
3909 static inline void
3910 nfs4_transform_lock_offset(struct file_lock *lock)
3911 {
3912         if (lock->fl_start < 0)
3913                 lock->fl_start = OFFSET_MAX;
3914         if (lock->fl_end < 0)
3915                 lock->fl_end = OFFSET_MAX;
3916 }
3917
3918 /* Hack!: For now, we're defining this just so we can use a pointer to it
3919  * as a unique cookie to identify our (NFSv4's) posix locks. */
3920 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
3921 };
3922
3923 static inline void
3924 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3925 {
3926         struct nfs4_lockowner *lo;
3927
3928         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3929                 lo = (struct nfs4_lockowner *) fl->fl_owner;
3930                 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
3931                                         lo->lo_owner.so_owner.len, GFP_KERNEL);
3932                 if (!deny->ld_owner.data)
3933                         /* We just don't care that much */
3934                         goto nevermind;
3935                 deny->ld_owner.len = lo->lo_owner.so_owner.len;
3936                 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
3937         } else {
3938 nevermind:
3939                 deny->ld_owner.len = 0;
3940                 deny->ld_owner.data = NULL;
3941                 deny->ld_clientid.cl_boot = 0;
3942                 deny->ld_clientid.cl_id = 0;
3943         }
3944         deny->ld_start = fl->fl_start;
3945         deny->ld_length = NFS4_MAX_UINT64;
3946         if (fl->fl_end != NFS4_MAX_UINT64)
3947                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3948         deny->ld_type = NFS4_READ_LT;
3949         if (fl->fl_type != F_RDLCK)
3950                 deny->ld_type = NFS4_WRITE_LT;
3951 }
3952
3953 static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
3954 {
3955         struct nfs4_ol_stateid *lst;
3956
3957         if (!same_owner_str(&lo->lo_owner, owner, clid))
3958                 return false;
3959         lst = list_first_entry(&lo->lo_owner.so_stateids,
3960                                struct nfs4_ol_stateid, st_perstateowner);
3961         return lst->st_file->fi_inode == inode;
3962 }
3963
3964 static struct nfs4_lockowner *
3965 find_lockowner_str(struct inode *inode, clientid_t *clid,
3966                 struct xdr_netobj *owner)
3967 {
3968         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
3969         struct nfs4_lockowner *lo;
3970
3971         list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
3972                 if (same_lockowner_ino(lo, inode, clid, owner))
3973                         return lo;
3974         }
3975         return NULL;
3976 }
3977
3978 static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
3979 {
3980         struct inode *inode = open_stp->st_file->fi_inode;
3981         unsigned int inohash = lockowner_ino_hashval(inode,
3982                         clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
3983
3984         list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
3985         list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
3986         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
3987 }
3988
3989 /*
3990  * Alloc a lock owner structure.
3991  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3992  * occurred.
3993  *
3994  * strhashval = ownerstr_hashval
3995  */
3996
3997 static struct nfs4_lockowner *
3998 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
3999         struct nfs4_lockowner *lo;
4000
4001         lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
4002         if (!lo)
4003                 return NULL;
4004         INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
4005         lo->lo_owner.so_is_open_owner = 0;
4006         /* It is the openowner seqid that will be incremented in encode in the
4007          * case of new lockowners; so increment the lock seqid manually: */
4008         lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
4009         hash_lockowner(lo, strhashval, clp, open_stp);
4010         return lo;
4011 }
4012
4013 static struct nfs4_ol_stateid *
4014 alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
4015 {
4016         struct nfs4_ol_stateid *stp;
4017         struct nfs4_client *clp = lo->lo_owner.so_client;
4018
4019         stp = nfs4_alloc_stateid(clp);
4020         if (stp == NULL)
4021                 return NULL;
4022         init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
4023         list_add(&stp->st_perfile, &fp->fi_stateids);
4024         list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
4025         stp->st_stateowner = &lo->lo_owner;
4026         get_nfs4_file(fp);
4027         stp->st_file = fp;
4028         stp->st_access_bmap = 0;
4029         stp->st_deny_bmap = open_stp->st_deny_bmap;
4030         stp->st_openstp = open_stp;
4031         return stp;
4032 }
4033
4034 static int
4035 check_lock_length(u64 offset, u64 length)
4036 {
4037         return ((length == 0)  || ((length != NFS4_MAX_UINT64) &&
4038              LOFF_OVERFLOW(offset, length)));
4039 }
4040
4041 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
4042 {
4043         struct nfs4_file *fp = lock_stp->st_file;
4044         int oflag = nfs4_access_to_omode(access);
4045
4046         if (test_access(access, lock_stp))
4047                 return;
4048         nfs4_file_get_access(fp, oflag);
4049         set_access(access, lock_stp);
4050 }
4051
4052 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)
4053 {
4054         struct nfs4_file *fi = ost->st_file;
4055         struct nfs4_openowner *oo = openowner(ost->st_stateowner);
4056         struct nfs4_client *cl = oo->oo_owner.so_client;
4057         struct nfs4_lockowner *lo;
4058         unsigned int strhashval;
4059
4060         lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
4061         if (lo) {
4062                 if (!cstate->minorversion)
4063                         return nfserr_bad_seqid;
4064                 /* XXX: a lockowner always has exactly one stateid: */
4065                 *lst = list_first_entry(&lo->lo_owner.so_stateids,
4066                                 struct nfs4_ol_stateid, st_perstateowner);
4067                 return nfs_ok;
4068         }
4069         strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
4070                         &lock->v.new.owner);
4071         lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
4072         if (lo == NULL)
4073                 return nfserr_jukebox;
4074         *lst = alloc_init_lock_stateid(lo, fi, ost);
4075         if (*lst == NULL) {
4076                 release_lockowner(lo);
4077                 return nfserr_jukebox;
4078         }
4079         *new = true;
4080         return nfs_ok;
4081 }
4082
4083 /*
4084  *  LOCK operation
4085  */
4086 __be32
4087 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4088            struct nfsd4_lock *lock)
4089 {
4090         struct nfs4_openowner *open_sop = NULL;
4091         struct nfs4_lockowner *lock_sop = NULL;
4092         struct nfs4_ol_stateid *lock_stp;
4093         struct file *filp = NULL;
4094         struct file_lock *file_lock = NULL;
4095         struct file_lock *conflock = NULL;
4096         __be32 status = 0;
4097         bool new_state = false;
4098         int lkflg;
4099         int err;
4100         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4101
4102         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
4103                 (long long) lock->lk_offset,
4104                 (long long) lock->lk_length);
4105
4106         if (check_lock_length(lock->lk_offset, lock->lk_length))
4107                  return nfserr_inval;
4108
4109         if ((status = fh_verify(rqstp, &cstate->current_fh,
4110                                 S_IFREG, NFSD_MAY_LOCK))) {
4111                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
4112                 return status;
4113         }
4114
4115         nfs4_lock_state();
4116
4117         if (lock->lk_is_new) {
4118                 struct nfs4_ol_stateid *open_stp = NULL;
4119
4120                 if (nfsd4_has_session(cstate))
4121                         /* See rfc 5661 18.10.3: given clientid is ignored: */
4122                         memcpy(&lock->v.new.clientid,
4123                                 &cstate->session->se_client->cl_clientid,
4124                                 sizeof(clientid_t));
4125
4126                 status = nfserr_stale_clientid;
4127                 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
4128                         goto out;
4129
4130                 /* validate and update open stateid and open seqid */
4131                 status = nfs4_preprocess_confirmed_seqid_op(cstate,
4132                                         lock->lk_new_open_seqid,
4133                                         &lock->lk_new_open_stateid,
4134                                         &open_stp);
4135                 if (status)
4136                         goto out;
4137                 open_sop = openowner(open_stp->st_stateowner);
4138                 status = nfserr_bad_stateid;
4139                 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
4140                                                 &lock->v.new.clientid))
4141                         goto out;
4142                 status = lookup_or_create_lock_state(cstate, open_stp, lock,
4143                                                         &lock_stp, &new_state);
4144         } else
4145                 status = nfs4_preprocess_seqid_op(cstate,
4146                                        lock->lk_old_lock_seqid,
4147                                        &lock->lk_old_lock_stateid,
4148                                        NFS4_LOCK_STID, &lock_stp);
4149         if (status)
4150                 goto out;
4151         lock_sop = lockowner(lock_stp->st_stateowner);
4152
4153         lkflg = setlkflg(lock->lk_type);
4154         status = nfs4_check_openmode(lock_stp, lkflg);
4155         if (status)
4156                 goto out;
4157
4158         status = nfserr_grace;
4159         if (locks_in_grace(SVC_NET(rqstp)) && !lock->lk_reclaim)
4160                 goto out;
4161         status = nfserr_no_grace;
4162         if (!locks_in_grace(SVC_NET(rqstp)) && lock->lk_reclaim)
4163                 goto out;
4164
4165         file_lock = locks_alloc_lock();
4166         if (!file_lock) {
4167                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4168                 status = nfserr_jukebox;
4169                 goto out;
4170         }
4171
4172         locks_init_lock(file_lock);
4173         switch (lock->lk_type) {
4174                 case NFS4_READ_LT:
4175                 case NFS4_READW_LT:
4176                         filp = find_readable_file(lock_stp->st_file);
4177                         if (filp)
4178                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
4179                         file_lock->fl_type = F_RDLCK;
4180                         break;
4181                 case NFS4_WRITE_LT:
4182                 case NFS4_WRITEW_LT:
4183                         filp = find_writeable_file(lock_stp->st_file);
4184                         if (filp)
4185                                 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
4186                         file_lock->fl_type = F_WRLCK;
4187                         break;
4188                 default:
4189                         status = nfserr_inval;
4190                 goto out;
4191         }
4192         if (!filp) {
4193                 status = nfserr_openmode;
4194                 goto out;
4195         }
4196         file_lock->fl_owner = (fl_owner_t)lock_sop;
4197         file_lock->fl_pid = current->tgid;
4198         file_lock->fl_file = filp;
4199         file_lock->fl_flags = FL_POSIX;
4200         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4201         file_lock->fl_start = lock->lk_offset;
4202         file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
4203         nfs4_transform_lock_offset(file_lock);
4204
4205         conflock = locks_alloc_lock();
4206         if (!conflock) {
4207                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4208                 status = nfserr_jukebox;
4209                 goto out;
4210         }
4211
4212         err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
4213         switch (-err) {
4214         case 0: /* success! */
4215                 update_stateid(&lock_stp->st_stid.sc_stateid);
4216                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
4217                                 sizeof(stateid_t));
4218                 status = 0;
4219                 break;
4220         case (EAGAIN):          /* conflock holds conflicting lock */
4221                 status = nfserr_denied;
4222                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
4223                 nfs4_set_lock_denied(conflock, &lock->lk_denied);
4224                 break;
4225         case (EDEADLK):
4226                 status = nfserr_deadlock;
4227                 break;
4228         default:
4229                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
4230                 status = nfserrno(err);
4231                 break;
4232         }
4233 out:
4234         if (status && new_state)
4235                 release_lockowner(lock_sop);
4236         if (!cstate->replay_owner)
4237                 nfs4_unlock_state();
4238         if (file_lock)
4239                 locks_free_lock(file_lock);
4240         if (conflock)
4241                 locks_free_lock(conflock);
4242         return status;
4243 }
4244
4245 /*
4246  * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
4247  * so we do a temporary open here just to get an open file to pass to
4248  * vfs_test_lock.  (Arguably perhaps test_lock should be done with an
4249  * inode operation.)
4250  */
4251 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
4252 {
4253         struct file *file;
4254         __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
4255         if (!err) {
4256                 err = nfserrno(vfs_test_lock(file, lock));
4257                 nfsd_close(file);
4258         }
4259         return err;
4260 }
4261
4262 /*
4263  * LOCKT operation
4264  */
4265 __be32
4266 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4267             struct nfsd4_lockt *lockt)
4268 {
4269         struct inode *inode;
4270         struct file_lock *file_lock = NULL;
4271         struct nfs4_lockowner *lo;
4272         __be32 status;
4273         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4274
4275         if (locks_in_grace(SVC_NET(rqstp)))
4276                 return nfserr_grace;
4277
4278         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
4279                  return nfserr_inval;
4280
4281         nfs4_lock_state();
4282
4283         status = nfserr_stale_clientid;
4284         if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid, nn))
4285                 goto out;
4286
4287         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4288                 goto out;
4289
4290         inode = cstate->current_fh.fh_dentry->d_inode;
4291         file_lock = locks_alloc_lock();
4292         if (!file_lock) {
4293                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4294                 status = nfserr_jukebox;
4295                 goto out;
4296         }
4297         locks_init_lock(file_lock);
4298         switch (lockt->lt_type) {
4299                 case NFS4_READ_LT:
4300                 case NFS4_READW_LT:
4301                         file_lock->fl_type = F_RDLCK;
4302                 break;
4303                 case NFS4_WRITE_LT:
4304                 case NFS4_WRITEW_LT:
4305                         file_lock->fl_type = F_WRLCK;
4306                 break;
4307                 default:
4308                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
4309                         status = nfserr_inval;
4310                 goto out;
4311         }
4312
4313         lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
4314         if (lo)
4315                 file_lock->fl_owner = (fl_owner_t)lo;
4316         file_lock->fl_pid = current->tgid;
4317         file_lock->fl_flags = FL_POSIX;
4318
4319         file_lock->fl_start = lockt->lt_offset;
4320         file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
4321
4322         nfs4_transform_lock_offset(file_lock);
4323
4324         status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
4325         if (status)
4326                 goto out;
4327
4328         if (file_lock->fl_type != F_UNLCK) {
4329                 status = nfserr_denied;
4330                 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
4331         }
4332 out:
4333         nfs4_unlock_state();
4334         if (file_lock)
4335                 locks_free_lock(file_lock);
4336         return status;
4337 }
4338
4339 __be32
4340 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4341             struct nfsd4_locku *locku)
4342 {
4343         struct nfs4_ol_stateid *stp;
4344         struct file *filp = NULL;
4345         struct file_lock *file_lock = NULL;
4346         __be32 status;
4347         int err;
4348
4349         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
4350                 (long long) locku->lu_offset,
4351                 (long long) locku->lu_length);
4352
4353         if (check_lock_length(locku->lu_offset, locku->lu_length))
4354                  return nfserr_inval;
4355
4356         nfs4_lock_state();
4357
4358         status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
4359                                         &locku->lu_stateid, NFS4_LOCK_STID, &stp);
4360         if (status)
4361                 goto out;
4362         filp = find_any_file(stp->st_file);
4363         if (!filp) {
4364                 status = nfserr_lock_range;
4365                 goto out;
4366         }
4367         file_lock = locks_alloc_lock();
4368         if (!file_lock) {
4369                 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
4370                 status = nfserr_jukebox;
4371                 goto out;
4372         }
4373         locks_init_lock(file_lock);
4374         file_lock->fl_type = F_UNLCK;
4375         file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
4376         file_lock->fl_pid = current->tgid;
4377         file_lock->fl_file = filp;
4378         file_lock->fl_flags = FL_POSIX;
4379         file_lock->fl_lmops = &nfsd_posix_mng_ops;
4380         file_lock->fl_start = locku->lu_offset;
4381
4382         file_lock->fl_end = last_byte_offset(locku->lu_offset,
4383                                                 locku->lu_length);
4384         nfs4_transform_lock_offset(file_lock);
4385
4386         /*
4387         *  Try to unlock the file in the VFS.
4388         */
4389         err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
4390         if (err) {
4391                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
4392                 goto out_nfserr;
4393         }
4394         /*
4395         * OK, unlock succeeded; the only thing left to do is update the stateid.
4396         */
4397         update_stateid(&stp->st_stid.sc_stateid);
4398         memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4399
4400 out:
4401         if (!cstate->replay_owner)
4402                 nfs4_unlock_state();
4403         if (file_lock)
4404                 locks_free_lock(file_lock);
4405         return status;
4406
4407 out_nfserr:
4408         status = nfserrno(err);
4409         goto out;
4410 }
4411
4412 /*
4413  * returns
4414  *      1: locks held by lockowner
4415  *      0: no locks held by lockowner
4416  */
4417 static int
4418 check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner)
4419 {
4420         struct file_lock **flpp;
4421         struct inode *inode = filp->fi_inode;
4422         int status = 0;
4423
4424         lock_flocks();
4425         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4426                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4427                         status = 1;
4428                         goto out;
4429                 }
4430         }
4431 out:
4432         unlock_flocks();
4433         return status;
4434 }
4435
4436 __be32
4437 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4438                         struct nfsd4_compound_state *cstate,
4439                         struct nfsd4_release_lockowner *rlockowner)
4440 {
4441         clientid_t *clid = &rlockowner->rl_clientid;
4442         struct nfs4_stateowner *sop;
4443         struct nfs4_lockowner *lo;
4444         struct nfs4_ol_stateid *stp;
4445         struct xdr_netobj *owner = &rlockowner->rl_owner;
4446         struct list_head matches;
4447         unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
4448         __be32 status;
4449         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4450
4451         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4452                 clid->cl_boot, clid->cl_id);
4453
4454         /* XXX check for lease expiration */
4455
4456         status = nfserr_stale_clientid;
4457         if (STALE_CLIENTID(clid, nn))
4458                 return status;
4459
4460         nfs4_lock_state();
4461
4462         status = nfserr_locks_held;
4463         INIT_LIST_HEAD(&matches);
4464
4465         list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) {
4466                 if (sop->so_is_open_owner)
4467                         continue;
4468                 if (!same_owner_str(sop, owner, clid))
4469                         continue;
4470                 list_for_each_entry(stp, &sop->so_stateids,
4471                                 st_perstateowner) {
4472                         lo = lockowner(sop);
4473                         if (check_for_locks(stp->st_file, lo))
4474                                 goto out;
4475                         list_add(&lo->lo_list, &matches);
4476                 }
4477         }
4478         /* Clients probably won't expect us to return with some (but not all)
4479          * of the lockowner state released; so don't release any until all
4480          * have been checked. */
4481         status = nfs_ok;
4482         while (!list_empty(&matches)) {
4483                 lo = list_entry(matches.next, struct nfs4_lockowner,
4484                                                                 lo_list);
4485                 /* unhash_stateowner deletes so_perclient only
4486                  * for openowners. */
4487                 list_del(&lo->lo_list);
4488                 release_lockowner(lo);
4489         }
4490 out:
4491         nfs4_unlock_state();
4492         return status;
4493 }
4494
4495 static inline struct nfs4_client_reclaim *
4496 alloc_reclaim(void)
4497 {
4498         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4499 }
4500
4501 bool
4502 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
4503 {
4504         struct nfs4_client_reclaim *crp;
4505
4506         crp = nfsd4_find_reclaim_client(name, nn);
4507         return (crp && crp->cr_clp);
4508 }
4509
4510 /*
4511  * failure => all reset bets are off, nfserr_no_grace...
4512  */
4513 struct nfs4_client_reclaim *
4514 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
4515 {
4516         unsigned int strhashval;
4517         struct nfs4_client_reclaim *crp;
4518
4519         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4520         crp = alloc_reclaim();
4521         if (crp) {
4522                 strhashval = clientstr_hashval(name);
4523                 INIT_LIST_HEAD(&crp->cr_strhash);
4524                 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
4525                 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4526                 crp->cr_clp = NULL;
4527                 nn->reclaim_str_hashtbl_size++;
4528         }
4529         return crp;
4530 }
4531
4532 void
4533 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
4534 {
4535         list_del(&crp->cr_strhash);
4536         kfree(crp);
4537         nn->reclaim_str_hashtbl_size--;
4538 }
4539
4540 void
4541 nfs4_release_reclaim(struct nfsd_net *nn)
4542 {
4543         struct nfs4_client_reclaim *crp = NULL;
4544         int i;
4545
4546         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4547                 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
4548                         crp = list_entry(nn->reclaim_str_hashtbl[i].next,
4549                                         struct nfs4_client_reclaim, cr_strhash);
4550                         nfs4_remove_reclaim_record(crp, nn);
4551                 }
4552         }
4553         BUG_ON(nn->reclaim_str_hashtbl_size);
4554 }
4555
4556 /*
4557  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4558 struct nfs4_client_reclaim *
4559 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
4560 {
4561         unsigned int strhashval;
4562         struct nfs4_client_reclaim *crp = NULL;
4563
4564         dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
4565
4566         strhashval = clientstr_hashval(recdir);
4567         list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
4568                 if (same_name(crp->cr_recdir, recdir)) {
4569                         return crp;
4570                 }
4571         }
4572         return NULL;
4573 }
4574
4575 /*
4576 * Called from OPEN. Look for clientid in reclaim list.
4577 */
4578 __be32
4579 nfs4_check_open_reclaim(clientid_t *clid, bool sessions)
4580 {
4581         struct nfs4_client *clp;
4582         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
4583
4584         /* find clientid in conf_id_hashtbl */
4585         clp = find_confirmed_client(clid, sessions, nn);
4586         if (clp == NULL)
4587                 return nfserr_reclaim_bad;
4588
4589         return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
4590 }
4591
4592 #ifdef CONFIG_NFSD_FAULT_INJECTION
4593
4594 void nfsd_forget_clients(u64 num)
4595 {
4596         struct nfs4_client *clp, *next;
4597         int count = 0;
4598
4599         nfs4_lock_state();
4600         list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
4601                 expire_client(clp);
4602                 if (++count == num)
4603                         break;
4604         }
4605         nfs4_unlock_state();
4606
4607         printk(KERN_INFO "NFSD: Forgot %d clients", count);
4608 }
4609
4610 static void release_lockowner_sop(struct nfs4_stateowner *sop)
4611 {
4612         release_lockowner(lockowner(sop));
4613 }
4614
4615 static void release_openowner_sop(struct nfs4_stateowner *sop)
4616 {
4617         release_openowner(openowner(sop));
4618 }
4619
4620 static int nfsd_release_n_owners(u64 num, bool is_open_owner,
4621                                 void (*release_sop)(struct nfs4_stateowner *))
4622 {
4623         int i, count = 0;
4624         struct nfs4_stateowner *sop, *next;
4625
4626         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4627                 list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) {
4628                         if (sop->so_is_open_owner != is_open_owner)
4629                                 continue;
4630                         release_sop(sop);
4631                         if (++count == num)
4632                                 return count;
4633                 }
4634         }
4635         return count;
4636 }
4637
4638 void nfsd_forget_locks(u64 num)
4639 {
4640         int count;
4641
4642         nfs4_lock_state();
4643         count = nfsd_release_n_owners(num, false, release_lockowner_sop);
4644         nfs4_unlock_state();
4645
4646         printk(KERN_INFO "NFSD: Forgot %d locks", count);
4647 }
4648
4649 void nfsd_forget_openowners(u64 num)
4650 {
4651         int count;
4652
4653         nfs4_lock_state();
4654         count = nfsd_release_n_owners(num, true, release_openowner_sop);
4655         nfs4_unlock_state();
4656
4657         printk(KERN_INFO "NFSD: Forgot %d open owners", count);
4658 }
4659
4660 static int nfsd_process_n_delegations(u64 num, struct list_head *list)
4661 {
4662         int i, count = 0;
4663         struct nfs4_file *fp, *fnext;
4664         struct nfs4_delegation *dp, *dnext;
4665
4666         for (i = 0; i < FILE_HASH_SIZE; i++) {
4667                 list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
4668                         list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
4669                                 list_move(&dp->dl_recall_lru, list);
4670                                 if (++count == num)
4671                                         return count;
4672                         }
4673                 }
4674         }
4675
4676         return count;
4677 }
4678
4679 void nfsd_forget_delegations(u64 num)
4680 {
4681         unsigned int count;
4682         LIST_HEAD(victims);
4683         struct nfs4_delegation *dp, *dnext;
4684
4685         spin_lock(&recall_lock);
4686         count = nfsd_process_n_delegations(num, &victims);
4687         spin_unlock(&recall_lock);
4688
4689         nfs4_lock_state();
4690         list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru)
4691                 unhash_delegation(dp);
4692         nfs4_unlock_state();
4693
4694         printk(KERN_INFO "NFSD: Forgot %d delegations", count);
4695 }
4696
4697 void nfsd_recall_delegations(u64 num)
4698 {
4699         unsigned int count;
4700         LIST_HEAD(victims);
4701         struct nfs4_delegation *dp, *dnext;
4702
4703         spin_lock(&recall_lock);
4704         count = nfsd_process_n_delegations(num, &victims);
4705         list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru) {
4706                 list_del(&dp->dl_recall_lru);
4707                 nfsd_break_one_deleg(dp);
4708         }
4709         spin_unlock(&recall_lock);
4710
4711         printk(KERN_INFO "NFSD: Recalled %d delegations", count);
4712 }
4713
4714 #endif /* CONFIG_NFSD_FAULT_INJECTION */
4715
4716 /* initialization to perform at module load time: */
4717
4718 void
4719 nfs4_state_init(void)
4720 {
4721         int i;
4722
4723         unconf_name_tree = RB_ROOT;
4724         for (i = 0; i < SESSION_HASH_SIZE; i++)
4725                 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4726         for (i = 0; i < FILE_HASH_SIZE; i++) {
4727                 INIT_LIST_HEAD(&file_hashtbl[i]);
4728         }
4729         for (i = 0; i < OWNER_HASH_SIZE; i++) {
4730                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4731         }
4732         for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
4733                 INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
4734         INIT_LIST_HEAD(&close_lru);
4735         INIT_LIST_HEAD(&client_lru);
4736         INIT_LIST_HEAD(&del_recall_lru);
4737 }
4738
4739 /*
4740  * Since the lifetime of a delegation isn't limited to that of an open, a
4741  * client may quite reasonably hang on to a delegation as long as it has
4742  * the inode cached.  This becomes an obvious problem the first time a
4743  * client's inode cache approaches the size of the server's total memory.
4744  *
4745  * For now we avoid this problem by imposing a hard limit on the number
4746  * of delegations, which varies according to the server's memory size.
4747  */
4748 static void
4749 set_max_delegations(void)
4750 {
4751         /*
4752          * Allow at most 4 delegations per megabyte of RAM.  Quick
4753          * estimates suggest that in the worst case (where every delegation
4754          * is for a different inode), a delegation could take about 1.5K,
4755          * giving a worst case usage of about 6% of memory.
4756          */
4757         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4758 }
4759
4760 static int nfs4_state_start_net(struct net *net)
4761 {
4762         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4763         int i;
4764
4765         nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4766                         CLIENT_HASH_SIZE, GFP_KERNEL);
4767         if (!nn->conf_id_hashtbl)
4768                 goto err;
4769         nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
4770                         CLIENT_HASH_SIZE, GFP_KERNEL);
4771         if (!nn->unconf_id_hashtbl)
4772                 goto err_unconf_id;
4773
4774         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4775                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
4776                 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
4777         }
4778         nn->conf_name_tree = RB_ROOT;
4779
4780         return 0;
4781
4782 err_unconf_id:
4783         kfree(nn->conf_id_hashtbl);
4784 err:
4785         return -ENOMEM;
4786 }
4787
4788 static void
4789 __nfs4_state_shutdown_net(struct net *net)
4790 {
4791         int i;
4792         struct nfs4_client *clp = NULL;
4793         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4794
4795         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4796                 while (!list_empty(&nn->conf_id_hashtbl[i])) {
4797                         clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4798                         destroy_client(clp);
4799                 }
4800         }
4801         kfree(nn->unconf_id_hashtbl);
4802         kfree(nn->conf_id_hashtbl);
4803 }
4804
4805 /* initialization to perform when the nfsd service is started: */
4806
4807 int
4808 nfs4_state_start(void)
4809 {
4810         struct net *net = &init_net;
4811         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4812         int ret;
4813
4814         /*
4815          * FIXME: For now, we hang most of the pernet global stuff off of
4816          * init_net until nfsd is fully containerized. Eventually, we'll
4817          * need to pass a net pointer into this function, take a reference
4818          * to that instead and then do most of the rest of this on a per-net
4819          * basis.
4820          */
4821         get_net(net);
4822         ret = nfs4_state_start_net(net);
4823         if (ret)
4824                 return ret;
4825         nfsd4_client_tracking_init(net);
4826         nn->boot_time = get_seconds();
4827         locks_start_grace(net, &nn->nfsd4_manager);
4828         nn->grace_ended = false;
4829         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4830                nfsd4_grace);
4831         ret = set_callback_cred();
4832         if (ret) {
4833                 ret = -ENOMEM;
4834                 goto out_recovery;
4835         }
4836         laundry_wq = create_singlethread_workqueue("nfsd4");
4837         if (laundry_wq == NULL) {
4838                 ret = -ENOMEM;
4839                 goto out_recovery;
4840         }
4841         ret = nfsd4_create_callback_queue();
4842         if (ret)
4843                 goto out_free_laundry;
4844         queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4845         set_max_delegations();
4846         return 0;
4847 out_free_laundry:
4848         destroy_workqueue(laundry_wq);
4849 out_recovery:
4850         nfsd4_client_tracking_exit(net);
4851         __nfs4_state_shutdown_net(net);
4852         put_net(net);
4853         return ret;
4854 }
4855
4856 /* should be called with the state lock held */
4857 static void
4858 __nfs4_state_shutdown(struct net *net)
4859 {
4860         struct nfs4_client *clp = NULL;
4861         struct nfs4_delegation *dp = NULL;
4862         struct list_head *pos, *next, reaplist;
4863         struct rb_node *node, *tmp;
4864
4865         __nfs4_state_shutdown_net(net);
4866
4867         node = rb_first(&unconf_name_tree);
4868         while (node != NULL) {
4869                 tmp = node;
4870                 node = rb_next(tmp);
4871                 clp = rb_entry(tmp, struct nfs4_client, cl_namenode);
4872                 rb_erase(tmp, &unconf_name_tree);
4873                 destroy_client(clp);
4874         }
4875
4876         INIT_LIST_HEAD(&reaplist);
4877         spin_lock(&recall_lock);
4878         list_for_each_safe(pos, next, &del_recall_lru) {
4879                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4880                 list_move(&dp->dl_recall_lru, &reaplist);
4881         }
4882         spin_unlock(&recall_lock);
4883         list_for_each_safe(pos, next, &reaplist) {
4884                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4885                 unhash_delegation(dp);
4886         }
4887
4888         nfsd4_client_tracking_exit(&init_net);
4889         put_net(&init_net);
4890 }
4891
4892 void
4893 nfs4_state_shutdown(void)
4894 {
4895         struct net *net = &init_net;
4896         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4897
4898         cancel_delayed_work_sync(&laundromat_work);
4899         destroy_workqueue(laundry_wq);
4900         locks_end_grace(&nn->nfsd4_manager);
4901         nfs4_lock_state();
4902         __nfs4_state_shutdown(net);
4903         nfs4_unlock_state();
4904         nfsd4_destroy_callback_queue();
4905 }
4906
4907 static void
4908 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4909 {
4910         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
4911                 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
4912 }
4913
4914 static void
4915 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
4916 {
4917         if (cstate->minorversion) {
4918                 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
4919                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4920         }
4921 }
4922
4923 void
4924 clear_current_stateid(struct nfsd4_compound_state *cstate)
4925 {
4926         CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
4927 }
4928
4929 /*
4930  * functions to set current state id
4931  */
4932 void
4933 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4934 {
4935         put_stateid(cstate, &odp->od_stateid);
4936 }
4937
4938 void
4939 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
4940 {
4941         put_stateid(cstate, &open->op_stateid);
4942 }
4943
4944 void
4945 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4946 {
4947         put_stateid(cstate, &close->cl_stateid);
4948 }
4949
4950 void
4951 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
4952 {
4953         put_stateid(cstate, &lock->lk_resp_stateid);
4954 }
4955
4956 /*
4957  * functions to consume current state id
4958  */
4959
4960 void
4961 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
4962 {
4963         get_stateid(cstate, &odp->od_stateid);
4964 }
4965
4966 void
4967 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
4968 {
4969         get_stateid(cstate, &drp->dr_stateid);
4970 }
4971
4972 void
4973 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
4974 {
4975         get_stateid(cstate, &fsp->fr_stateid);
4976 }
4977
4978 void
4979 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
4980 {
4981         get_stateid(cstate, &setattr->sa_stateid);
4982 }
4983
4984 void
4985 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
4986 {
4987         get_stateid(cstate, &close->cl_stateid);
4988 }
4989
4990 void
4991 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
4992 {
4993         get_stateid(cstate, &locku->lu_stateid);
4994 }
4995
4996 void
4997 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
4998 {
4999         get_stateid(cstate, &read->rd_stateid);
5000 }
5001
5002 void
5003 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
5004 {
5005         get_stateid(cstate, &write->wr_stateid);
5006 }