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   1 /*
   2 *  linux/fs/nfsd/nfs4state.c
   3 *
   4 *  Copyright (c) 2001 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson <kandros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 */
  36
  37 #include <linux/param.h>
  38 #include <linux/major.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/sunrpc/svc.h>
  42 #include <linux/nfsd/nfsd.h>
  43 #include <linux/nfsd/cache.h>
  44 #include <linux/mount.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/kthread.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfsd/state.h>
  50 #include <linux/nfsd/xdr4.h>
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 /* Globals */
  55 static time_t lease_time = 90;     /* default lease time */
  56 static time_t user_lease_time = 90;
  57 time_t boot_time;
  58 static time_t grace_end = 0;
  59 static u32 current_clientid = 1;
  60 static u32 current_ownerid = 1;
  61 static u32 current_fileid = 1;
  62 static u32 current_delegid = 1;
  63 static u32 nfs4_init;
  64 stateid_t zerostateid;             /* bits all 0 */
  65 stateid_t onestateid;              /* bits all 1 */
  66
  67 /* forward declarations */
  68 struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  69 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  70 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  71
  72 /* Locking:
  73  *
  74  * client_sema:
  75  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  76  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  77  */
  78 static DECLARE_MUTEX(client_sema);
  79
  80 kmem_cache_t *stateowner_slab = NULL;
  81 kmem_cache_t *file_slab = NULL;
  82 kmem_cache_t *stateid_slab = NULL;
  83 kmem_cache_t *deleg_slab = NULL;
  84
  85 void
  86 nfs4_lock_state(void)
  87 {
  88         down(&client_sema);
  89 }
  90
  91 void
  92 nfs4_unlock_state(void)
  93 {
  94         up(&client_sema);
  95 }
  96
  97 static inline u32
  98 opaque_hashval(const void *ptr, int nbytes)
  99 {
 100         unsigned char *cptr = (unsigned char *) ptr;
 101
 102         u32 x = 0;
 103         while (nbytes--) {
 104                 x *= 37;
 105                 x += *cptr++;
 106         }
 107         return x;
 108 }
 109
 110 /* forward declarations */
 111 static void release_stateowner(struct nfs4_stateowner *sop);
 112 static void release_stateid(struct nfs4_stateid *stp, int flags);
 113
 114 /*
 115  * Delegation state
 116  */
 117
 118 /* recall_lock protects the del_recall_lru */
 119 spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
 120 static struct list_head del_recall_lru;
 121
 122 static void
 123 free_nfs4_file(struct kref *kref)
 124 {
 125         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 126         list_del(&fp->fi_hash);
 127         iput(fp->fi_inode);
 128         kmem_cache_free(file_slab, fp);
 129 }
 130
 131 static inline void
 132 put_nfs4_file(struct nfs4_file *fi)
 133 {
 134         kref_put(&fi->fi_ref, free_nfs4_file);
 135 }
 136
 137 static inline void
 138 get_nfs4_file(struct nfs4_file *fi)
 139 {
 140         kref_get(&fi->fi_ref);
 141 }
 142
 143 static struct nfs4_delegation *
 144 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 145 {
 146         struct nfs4_delegation *dp;
 147         struct nfs4_file *fp = stp->st_file;
 148         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 149
 150         dprintk("NFSD alloc_init_deleg\n");
 151         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 152         if (dp == NULL)
 153                 return dp;
 154         INIT_LIST_HEAD(&dp->dl_del_perfile);
 155         INIT_LIST_HEAD(&dp->dl_del_perclnt);
 156         INIT_LIST_HEAD(&dp->dl_recall_lru);
 157         dp->dl_client = clp;
 158         get_nfs4_file(fp);
 159         dp->dl_file = fp;
 160         dp->dl_flock = NULL;
 161         get_file(stp->st_vfs_file);
 162         dp->dl_vfs_file = stp->st_vfs_file;
 163         dp->dl_type = type;
 164         dp->dl_recall.cbr_dp = NULL;
 165         dp->dl_recall.cbr_ident = cb->cb_ident;
 166         dp->dl_recall.cbr_trunc = 0;
 167         dp->dl_stateid.si_boot = boot_time;
 168         dp->dl_stateid.si_stateownerid = current_delegid++;
 169         dp->dl_stateid.si_fileid = 0;
 170         dp->dl_stateid.si_generation = 0;
 171         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 172         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 173                         current_fh->fh_handle.fh_size);
 174         dp->dl_time = 0;
 175         atomic_set(&dp->dl_count, 1);
 176         list_add(&dp->dl_del_perfile, &fp->fi_delegations);
 177         list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
 178         return dp;
 179 }
 180
 181 void
 182 nfs4_put_delegation(struct nfs4_delegation *dp)
 183 {
 184         if (atomic_dec_and_test(&dp->dl_count)) {
 185                 dprintk("NFSD: freeing dp %p\n",dp);
 186                 put_nfs4_file(dp->dl_file);
 187                 kmem_cache_free(deleg_slab, dp);
 188         }
 189 }
 190
 191 /* Remove the associated file_lock first, then remove the delegation.
 192  * lease_modify() is called to remove the FS_LEASE file_lock from
 193  * the i_flock list, eventually calling nfsd's lock_manager
 194  * fl_release_callback.
 195  */
 196 static void
 197 nfs4_close_delegation(struct nfs4_delegation *dp)
 198 {
 199         struct file *filp = dp->dl_vfs_file;
 200
 201         dprintk("NFSD: close_delegation dp %p\n",dp);
 202         dp->dl_vfs_file = NULL;
 203         /* The following nfsd_close may not actually close the file,
 204          * but we want to remove the lease in any case. */
 205         if (dp->dl_flock)
 206                 setlease(filp, F_UNLCK, &dp->dl_flock);
 207         nfsd_close(filp);
 208 }
 209
 210 /* Called under the state lock. */
 211 static void
 212 unhash_delegation(struct nfs4_delegation *dp)
 213 {
 214         list_del_init(&dp->dl_del_perfile);
 215         list_del_init(&dp->dl_del_perclnt);
 216         spin_lock(&recall_lock);
 217         list_del_init(&dp->dl_recall_lru);
 218         spin_unlock(&recall_lock);
 219         nfs4_close_delegation(dp);
 220         nfs4_put_delegation(dp);
 221 }
 222
 223 /*
 224  * SETCLIENTID state
 225  */
 226
 227 /* Hash tables for nfs4_clientid state */
 228 #define CLIENT_HASH_BITS                 4
 229 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 230 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 231
 232 #define clientid_hashval(id) \
 233         ((id) & CLIENT_HASH_MASK)
 234 #define clientstr_hashval(name, namelen) \
 235         (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
 236 /*
 237  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 238  * used in reboot/reset lease grace period processing
 239  *
 240  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 241  * setclientid_confirmed info.
 242  *
 243  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 244  * setclientid info.
 245  *
 246  * client_lru holds client queue ordered by nfs4_client.cl_time
 247  * for lease renewal.
 248  *
 249  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 250  * for last close replay.
 251  */
 252 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 253 static int reclaim_str_hashtbl_size = 0;
 254 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 255 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 256 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 257 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 258 static struct list_head client_lru;
 259 static struct list_head close_lru;
 260
 261 static inline void
 262 renew_client(struct nfs4_client *clp)
 263 {
 264         /*
 265         * Move client to the end to the LRU list.
 266         */
 267         dprintk("renewing client (clientid %08x/%08x)\n",
 268                         clp->cl_clientid.cl_boot,
 269                         clp->cl_clientid.cl_id);
 270         list_move_tail(&clp->cl_lru, &client_lru);
 271         clp->cl_time = get_seconds();
 272 }
 273
 274 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 275 static int
 276 STALE_CLIENTID(clientid_t *clid)
 277 {
 278         if (clid->cl_boot == boot_time)
 279                 return 0;
 280         dprintk("NFSD stale clientid (%08x/%08x)\n",
 281                         clid->cl_boot, clid->cl_id);
 282         return 1;
 283 }
 284
 285 /*
 286  * XXX Should we use a slab cache ?
 287  * This type of memory management is somewhat inefficient, but we use it
 288  * anyway since SETCLIENTID is not a common operation.
 289  */
 290 static inline struct nfs4_client *
 291 alloc_client(struct xdr_netobj name)
 292 {
 293         struct nfs4_client *clp;
 294
 295         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 296                 memset(clp, 0, sizeof(*clp));
 297                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 298                         memcpy(clp->cl_name.data, name.data, name.len);
 299                         clp->cl_name.len = name.len;
 300                 }
 301                 else {
 302                         kfree(clp);
 303                         clp = NULL;
 304                 }
 305         }
 306         return clp;
 307 }
 308
 309 static inline void
 310 free_client(struct nfs4_client *clp)
 311 {
 312         if (clp->cl_cred.cr_group_info)
 313                 put_group_info(clp->cl_cred.cr_group_info);
 314         kfree(clp->cl_name.data);
 315         kfree(clp);
 316 }
 317
 318 void
 319 put_nfs4_client(struct nfs4_client *clp)
 320 {
 321         if (atomic_dec_and_test(&clp->cl_count))
 322                 free_client(clp);
 323 }
 324
 325 static void
 326 expire_client(struct nfs4_client *clp)
 327 {
 328         struct nfs4_stateowner *sop;
 329         struct nfs4_delegation *dp;
 330         struct nfs4_callback *cb = &clp->cl_callback;
 331         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 332         struct list_head reaplist;
 333
 334         dprintk("NFSD: expire_client cl_count %d\n",
 335                             atomic_read(&clp->cl_count));
 336
 337         /* shutdown rpc client, ending any outstanding recall rpcs */
 338         if (atomic_read(&cb->cb_set) == 1 && clnt) {
 339                 rpc_shutdown_client(clnt);
 340                 clnt = clp->cl_callback.cb_client = NULL;
 341         }
 342
 343         INIT_LIST_HEAD(&reaplist);
 344         spin_lock(&recall_lock);
 345         while (!list_empty(&clp->cl_del_perclnt)) {
 346                 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
 347                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 348                                 dp->dl_flock);
 349                 list_del_init(&dp->dl_del_perclnt);
 350                 list_move(&dp->dl_recall_lru, &reaplist);
 351         }
 352         spin_unlock(&recall_lock);
 353         while (!list_empty(&reaplist)) {
 354                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 355                 list_del_init(&dp->dl_recall_lru);
 356                 unhash_delegation(dp);
 357         }
 358         list_del(&clp->cl_idhash);
 359         list_del(&clp->cl_strhash);
 360         list_del(&clp->cl_lru);
 361         while (!list_empty(&clp->cl_perclient)) {
 362                 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
 363                 release_stateowner(sop);
 364         }
 365         put_nfs4_client(clp);
 366 }
 367
 368 static struct nfs4_client *
 369 create_client(struct xdr_netobj name) {
 370         struct nfs4_client *clp;
 371
 372         if (!(clp = alloc_client(name)))
 373                 goto out;
 374         atomic_set(&clp->cl_count, 1);
 375         atomic_set(&clp->cl_callback.cb_set, 0);
 376         clp->cl_callback.cb_parsed = 0;
 377         INIT_LIST_HEAD(&clp->cl_idhash);
 378         INIT_LIST_HEAD(&clp->cl_strhash);
 379         INIT_LIST_HEAD(&clp->cl_perclient);
 380         INIT_LIST_HEAD(&clp->cl_del_perclnt);
 381         INIT_LIST_HEAD(&clp->cl_lru);
 382 out:
 383         return clp;
 384 }
 385
 386 static void
 387 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 388         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 389 }
 390
 391 static void
 392 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 393         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 394         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 395 }
 396
 397 static void
 398 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 399
 400         target->cr_uid = source->cr_uid;
 401         target->cr_gid = source->cr_gid;
 402         target->cr_group_info = source->cr_group_info;
 403         get_group_info(target->cr_group_info);
 404 }
 405
 406 static int
 407 cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
 408         if (!n1 || !n2)
 409                 return 0;
 410         return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
 411 }
 412
 413 static int
 414 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 415         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 416 }
 417
 418 static int
 419 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 420         return((cl1->cl_boot == cl2->cl_boot) &&
 421                 (cl1->cl_id == cl2->cl_id));
 422 }
 423
 424 /* XXX what about NGROUP */
 425 static int
 426 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 427         return(cr1->cr_uid == cr2->cr_uid);
 428
 429 }
 430
 431 static void
 432 gen_clid(struct nfs4_client *clp) {
 433         clp->cl_clientid.cl_boot = boot_time;
 434         clp->cl_clientid.cl_id = current_clientid++;
 435 }
 436
 437 static void
 438 gen_confirm(struct nfs4_client *clp) {
 439         struct timespec         tv;
 440         u32 *                   p;
 441
 442         tv = CURRENT_TIME;
 443         p = (u32 *)clp->cl_confirm.data;
 444         *p++ = tv.tv_sec;
 445         *p++ = tv.tv_nsec;
 446 }
 447
 448 static int
 449 check_name(struct xdr_netobj name) {
 450
 451         if (name.len == 0)
 452                 return 0;
 453         if (name.len > NFS4_OPAQUE_LIMIT) {
 454                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 455                 return 0;
 456         }
 457         return 1;
 458 }
 459
 460 void
 461 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 462 {
 463         unsigned int idhashval;
 464
 465         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 466         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 467         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 468         list_add_tail(&clp->cl_lru, &client_lru);
 469         clp->cl_time = get_seconds();
 470 }
 471
 472 void
 473 move_to_confirmed(struct nfs4_client *clp)
 474 {
 475         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 476         unsigned int strhashval;
 477
 478         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 479         list_del_init(&clp->cl_strhash);
 480         list_del_init(&clp->cl_idhash);
 481         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 482         strhashval = clientstr_hashval(clp->cl_name.data,
 483                         clp->cl_name.len);
 484         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 485         renew_client(clp);
 486 }
 487
 488 static struct nfs4_client *
 489 find_confirmed_client(clientid_t *clid)
 490 {
 491         struct nfs4_client *clp;
 492         unsigned int idhashval = clientid_hashval(clid->cl_id);
 493
 494         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 495                 if (cmp_clid(&clp->cl_clientid, clid))
 496                         return clp;
 497         }
 498         return NULL;
 499 }
 500
 501 static struct nfs4_client *
 502 find_unconfirmed_client(clientid_t *clid)
 503 {
 504         struct nfs4_client *clp;
 505         unsigned int idhashval = clientid_hashval(clid->cl_id);
 506
 507         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 508                 if (cmp_clid(&clp->cl_clientid, clid))
 509                         return clp;
 510         }
 511         return NULL;
 512 }
 513
 514 /* a helper function for parse_callback */
 515 static int
 516 parse_octet(unsigned int *lenp, char **addrp)
 517 {
 518         unsigned int len = *lenp;
 519         char *p = *addrp;
 520         int n = -1;
 521         char c;
 522
 523         for (;;) {
 524                 if (!len)
 525                         break;
 526                 len--;
 527                 c = *p++;
 528                 if (c == '.')
 529                         break;
 530                 if ((c < '0') || (c > '9')) {
 531                         n = -1;
 532                         break;
 533                 }
 534                 if (n < 0)
 535                         n = 0;
 536                 n = (n * 10) + (c - '0');
 537                 if (n > 255) {
 538                         n = -1;
 539                         break;
 540                 }
 541         }
 542         *lenp = len;
 543         *addrp = p;
 544         return n;
 545 }
 546
 547 /* parse and set the setclientid ipv4 callback address */
 548 int
 549 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 550 {
 551         int temp = 0;
 552         u32 cbaddr = 0;
 553         u16 cbport = 0;
 554         u32 addrlen = addr_len;
 555         char *addr = addr_val;
 556         int i, shift;
 557
 558         /* ipaddress */
 559         shift = 24;
 560         for(i = 4; i > 0  ; i--) {
 561                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 562                         return 0;
 563                 }
 564                 cbaddr |= (temp << shift);
 565                 if (shift > 0)
 566                 shift -= 8;
 567         }
 568         *cbaddrp = cbaddr;
 569
 570         /* port */
 571         shift = 8;
 572         for(i = 2; i > 0  ; i--) {
 573                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 574                         return 0;
 575                 }
 576                 cbport |= (temp << shift);
 577                 if (shift > 0)
 578                         shift -= 8;
 579         }
 580         *cbportp = cbport;
 581         return 1;
 582 }
 583
 584 void
 585 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 586 {
 587         struct nfs4_callback *cb = &clp->cl_callback;
 588
 589         /* Currently, we only support tcp for the callback channel */
 590         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 591                 goto out_err;
 592
 593         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 594                          &cb->cb_addr, &cb->cb_port)))
 595                 goto out_err;
 596         cb->cb_prog = se->se_callback_prog;
 597         cb->cb_ident = se->se_callback_ident;
 598         cb->cb_parsed = 1;
 599         return;
 600 out_err:
 601         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 602                 "will not receive delegations\n",
 603                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 604
 605         cb->cb_parsed = 0;
 606         return;
 607 }
 608
 609 /*
 610  * RFC 3010 has a complex implmentation description of processing a
 611  * SETCLIENTID request consisting of 5 bullets, labeled as
 612  * CASE0 - CASE4 below.
 613  *
 614  * NOTES:
 615  *      callback information will be processed in a future patch
 616  *
 617  *      an unconfirmed record is added when:
 618  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 619  *      CASE 1: confirmed record found with matching name, principal,
 620  *              verifier, and clientid.
 621  *      CASE 2: confirmed record found with matching name, principal,
 622  *              and there is no unconfirmed record with matching
 623  *              name and principal
 624  *
 625  *      an unconfirmed record is replaced when:
 626  *      CASE 3: confirmed record found with matching name, principal,
 627  *              and an unconfirmed record is found with matching
 628  *              name, principal, and with clientid and
 629  *              confirm that does not match the confirmed record.
 630  *      CASE 4: there is no confirmed record with matching name and
 631  *              principal. there is an unconfirmed record with
 632  *              matching name, principal.
 633  *
 634  *      an unconfirmed record is deleted when:
 635  *      CASE 1: an unconfirmed record that matches input name, verifier,
 636  *              and confirmed clientid.
 637  *      CASE 4: any unconfirmed records with matching name and principal
 638  *              that exist after an unconfirmed record has been replaced
 639  *              as described above.
 640  *
 641  */
 642 int
 643 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 644 {
 645         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 646         struct xdr_netobj       clname = {
 647                 .len = setclid->se_namelen,
 648                 .data = setclid->se_name,
 649         };
 650         nfs4_verifier           clverifier = setclid->se_verf;
 651         unsigned int            strhashval;
 652         struct nfs4_client *    conf, * unconf, * new, * clp;
 653         int                     status;
 654
 655         status = nfserr_inval;
 656         if (!check_name(clname))
 657                 goto out;
 658
 659         /*
 660          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 661          * We get here on a DRC miss.
 662          */
 663
 664         strhashval = clientstr_hashval(clname.data, clname.len);
 665
 666         conf = NULL;
 667         nfs4_lock_state();
 668         list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
 669                 if (!cmp_name(&clp->cl_name, &clname))
 670                         continue;
 671                 /*
 672                  * CASE 0:
 673                  * clname match, confirmed, different principal
 674                  * or different ip_address
 675                  */
 676                 status = nfserr_clid_inuse;
 677                 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)
 678                                 || clp->cl_addr != ip_addr) {
 679                         printk("NFSD: setclientid: string in use by client"
 680                         "(clientid %08x/%08x)\n",
 681                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 682                         goto out;
 683                 }
 684                 conf = clp;
 685                 break;
 686         }
 687         unconf = NULL;
 688         list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
 689                 if (!cmp_name(&clp->cl_name, &clname))
 690                         continue;
 691                 /* cl_name match from a previous SETCLIENTID operation */
 692                 unconf = clp;
 693                 break;
 694         }
 695         status = nfserr_resource;
 696         if (!conf) {
 697                 /*
 698                  * CASE 4:
 699                  * placed first, because it is the normal case.
 700                  */
 701                 if (unconf)
 702                         expire_client(unconf);
 703                 if (!(new = create_client(clname)))
 704                         goto out;
 705                 copy_verf(new, &clverifier);
 706                 new->cl_addr = ip_addr;
 707                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 708                 gen_clid(new);
 709                 gen_confirm(new);
 710                 gen_callback(new, setclid);
 711                 add_to_unconfirmed(new, strhashval);
 712         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 713                 /*
 714                  * CASE 1:
 715                  * cl_name match, confirmed, principal match
 716                  * verifier match: probable callback update
 717                  *
 718                  * remove any unconfirmed nfs4_client with
 719                  * matching cl_name, cl_verifier, and cl_clientid
 720                  *
 721                  * create and insert an unconfirmed nfs4_client with same
 722                  * cl_name, cl_verifier, and cl_clientid as existing
 723                  * nfs4_client,  but with the new callback info and a
 724                  * new cl_confirm
 725                  */
 726                 if ((unconf) &&
 727                     cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
 728                      cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
 729                                 expire_client(unconf);
 730                 }
 731                 if (!(new = create_client(clname)))
 732                         goto out;
 733                 copy_verf(new,&conf->cl_verifier);
 734                 new->cl_addr = ip_addr;
 735                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 736                 copy_clid(new, conf);
 737                 gen_confirm(new);
 738                 gen_callback(new, setclid);
 739                 add_to_unconfirmed(new,strhashval);
 740         } else if (!unconf) {
 741                 /*
 742                  * CASE 2:
 743                  * clname match, confirmed, principal match
 744                  * verfier does not match
 745                  * no unconfirmed. create a new unconfirmed nfs4_client
 746                  * using input clverifier, clname, and callback info
 747                  * and generate a new cl_clientid and cl_confirm.
 748                  */
 749                 if (!(new = create_client(clname)))
 750                         goto out;
 751                 copy_verf(new,&clverifier);
 752                 new->cl_addr = ip_addr;
 753                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 754                 gen_clid(new);
 755                 gen_confirm(new);
 756                 gen_callback(new, setclid);
 757                 add_to_unconfirmed(new, strhashval);
 758         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 759                 /*
 760                  * CASE3:
 761                  * confirmed found (name, principal match)
 762                  * confirmed verifier does not match input clverifier
 763                  *
 764                  * unconfirmed found (name match)
 765                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 766                  *
 767                  * remove unconfirmed.
 768                  *
 769                  * create an unconfirmed nfs4_client
 770                  * with same cl_name as existing confirmed nfs4_client,
 771                  * but with new callback info, new cl_clientid,
 772                  * new cl_verifier and a new cl_confirm
 773                  */
 774                 expire_client(unconf);
 775                 if (!(new = create_client(clname)))
 776                         goto out;
 777                 copy_verf(new,&clverifier);
 778                 new->cl_addr = ip_addr;
 779                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 780                 gen_clid(new);
 781                 gen_confirm(new);
 782                 gen_callback(new, setclid);
 783                 add_to_unconfirmed(new, strhashval);
 784         } else {
 785                 /* No cases hit !!! */
 786                 status = nfserr_inval;
 787                 goto out;
 788
 789         }
 790         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 791         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 792         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 793         status = nfs_ok;
 794 out:
 795         nfs4_unlock_state();
 796         return status;
 797 }
 798
 799
 800 /*
 801  * RFC 3010 has a complex implmentation description of processing a
 802  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 803  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 804  *
 805  * NOTE: callback information will be processed here in a future patch
 806  */
 807 int
 808 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 809 {
 810         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 811         struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
 812         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 813         clientid_t * clid = &setclientid_confirm->sc_clientid;
 814         int status;
 815
 816         if (STALE_CLIENTID(clid))
 817                 return nfserr_stale_clientid;
 818         /*
 819          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 820          * We get here on a DRC miss.
 821          */
 822
 823         nfs4_lock_state();
 824         clp = find_confirmed_client(clid);
 825         if (clp) {
 826                 status = nfserr_inval;
 827                 /*
 828                  * Found a record for this clientid. If the IP addresses
 829                  * don't match, return ERR_INVAL just as if the record had
 830                  * not been found.
 831                  */
 832                 if (clp->cl_addr != ip_addr) {
 833                         printk("NFSD: setclientid: string in use by client"
 834                         "(clientid %08x/%08x)\n",
 835                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 836                         goto out;
 837                 }
 838                 conf = clp;
 839         }
 840         clp = find_unconfirmed_client(clid);
 841         if (clp) {
 842                 status = nfserr_inval;
 843                 if (clp->cl_addr != ip_addr) {
 844                         printk("NFSD: setclientid: string in use by client"
 845                         "(clientid %08x/%08x)\n",
 846                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 847                         goto out;
 848                 }
 849                 unconf = clp;
 850         }
 851         /* CASE 1:
 852         * unconf record that matches input clientid and input confirm.
 853         * conf record that matches input clientid.
 854         * conf  and unconf records match names, verifiers
 855         */
 856         if ((conf && unconf) &&
 857             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 858             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 859             (cmp_name(&conf->cl_name,&unconf->cl_name))  &&
 860             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 861                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 862                         status = nfserr_clid_inuse;
 863                 else {
 864                         expire_client(conf);
 865                         clp = unconf;
 866                         move_to_confirmed(unconf);
 867                         status = nfs_ok;
 868                 }
 869                 goto out;
 870         }
 871         /* CASE 2:
 872          * conf record that matches input clientid.
 873          * if unconf record that matches input clientid, then unconf->cl_name
 874          * or unconf->cl_verifier don't match the conf record.
 875          */
 876         if ((conf && !unconf) ||
 877             ((conf && unconf) &&
 878              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 879               !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
 880                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 881                         status = nfserr_clid_inuse;
 882                 } else {
 883                         clp = conf;
 884                         status = nfs_ok;
 885                 }
 886                 goto out;
 887         }
 888         /* CASE 3:
 889          * conf record not found.
 890          * unconf record found.
 891          * unconf->cl_confirm matches input confirm
 892          */
 893         if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
 894                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 895                         status = nfserr_clid_inuse;
 896                 } else {
 897                         status = nfs_ok;
 898                         clp = unconf;
 899                         move_to_confirmed(unconf);
 900                 }
 901                 goto out;
 902         }
 903         /* CASE 4:
 904          * conf record not found, or if conf, then conf->cl_confirm does not
 905          * match input confirm.
 906          * unconf record not found, or if unconf, then unconf->cl_confirm
 907          * does not match input confirm.
 908          */
 909         if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
 910             (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
 911                 status = nfserr_stale_clientid;
 912                 goto out;
 913         }
 914         /* check that we have hit one of the cases...*/
 915         status = nfserr_inval;
 916         goto out;
 917 out:
 918         if (!status)
 919                 nfsd4_probe_callback(clp);
 920         nfs4_unlock_state();
 921         return status;
 922 }
 923
 924 /*
 925  * Open owner state (share locks)
 926  */
 927
 928 /* hash tables for nfs4_stateowner */
 929 #define OWNER_HASH_BITS              8
 930 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 931 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 932
 933 #define ownerid_hashval(id) \
 934         ((id) & OWNER_HASH_MASK)
 935 #define ownerstr_hashval(clientid, ownername) \
 936         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 937
 938 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 939 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 940
 941 /* hash table for nfs4_file */
 942 #define FILE_HASH_BITS                   8
 943 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 944 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 945 /* hash table for (open)nfs4_stateid */
 946 #define STATEID_HASH_BITS              10
 947 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 948 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 949
 950 #define file_hashval(x) \
 951         hash_ptr(x, FILE_HASH_BITS)
 952 #define stateid_hashval(owner_id, file_id)  \
 953         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 954
 955 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 956 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 957
 958 /* OPEN Share state helper functions */
 959 static inline struct nfs4_file *
 960 alloc_init_file(struct inode *ino)
 961 {
 962         struct nfs4_file *fp;
 963         unsigned int hashval = file_hashval(ino);
 964
 965         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 966         if (fp) {
 967                 kref_init(&fp->fi_ref);
 968                 INIT_LIST_HEAD(&fp->fi_hash);
 969                 INIT_LIST_HEAD(&fp->fi_stateids);
 970                 INIT_LIST_HEAD(&fp->fi_delegations);
 971                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 972                 fp->fi_inode = igrab(ino);
 973                 fp->fi_id = current_fileid++;
 974                 return fp;
 975         }
 976         return NULL;
 977 }
 978
 979 static void
 980 nfsd4_free_slab(kmem_cache_t **slab)
 981 {
 982         int status;
 983
 984         if (*slab == NULL)
 985                 return;
 986         status = kmem_cache_destroy(*slab);
 987         *slab = NULL;
 988         WARN_ON(status);
 989 }
 990
 991 static void
 992 nfsd4_free_slabs(void)
 993 {
 994         nfsd4_free_slab(&stateowner_slab);
 995         nfsd4_free_slab(&file_slab);
 996         nfsd4_free_slab(&stateid_slab);
 997         nfsd4_free_slab(&deleg_slab);
 998 }
 999
1000 static int
1001 nfsd4_init_slabs(void)
1002 {
1003         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1004                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1005         if (stateowner_slab == NULL)
1006                 goto out_nomem;
1007         file_slab = kmem_cache_create("nfsd4_files",
1008                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1009         if (file_slab == NULL)
1010                 goto out_nomem;
1011         stateid_slab = kmem_cache_create("nfsd4_stateids",
1012                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1013         if (stateid_slab == NULL)
1014                 goto out_nomem;
1015         deleg_slab = kmem_cache_create("nfsd4_delegations",
1016                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1017         if (deleg_slab == NULL)
1018                 goto out_nomem;
1019         return 0;
1020 out_nomem:
1021         nfsd4_free_slabs();
1022         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1023         return -ENOMEM;
1024 }
1025
1026 void
1027 nfs4_free_stateowner(struct kref *kref)
1028 {
1029         struct nfs4_stateowner *sop =
1030                 container_of(kref, struct nfs4_stateowner, so_ref);
1031         kfree(sop->so_owner.data);
1032         kmem_cache_free(stateowner_slab, sop);
1033 }
1034
1035 static inline struct nfs4_stateowner *
1036 alloc_stateowner(struct xdr_netobj *owner)
1037 {
1038         struct nfs4_stateowner *sop;
1039
1040         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1041                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1042                         memcpy(sop->so_owner.data, owner->data, owner->len);
1043                         sop->so_owner.len = owner->len;
1044                         kref_init(&sop->so_ref);
1045                         return sop;
1046                 }
1047                 kmem_cache_free(stateowner_slab, sop);
1048         }
1049         return NULL;
1050 }
1051
1052 static struct nfs4_stateowner *
1053 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1054         struct nfs4_stateowner *sop;
1055         struct nfs4_replay *rp;
1056         unsigned int idhashval;
1057
1058         if (!(sop = alloc_stateowner(&open->op_owner)))
1059                 return NULL;
1060         idhashval = ownerid_hashval(current_ownerid);
1061         INIT_LIST_HEAD(&sop->so_idhash);
1062         INIT_LIST_HEAD(&sop->so_strhash);
1063         INIT_LIST_HEAD(&sop->so_perclient);
1064         INIT_LIST_HEAD(&sop->so_perfilestate);
1065         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
1066         INIT_LIST_HEAD(&sop->so_close_lru);
1067         sop->so_time = 0;
1068         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1069         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1070         list_add(&sop->so_perclient, &clp->cl_perclient);
1071         sop->so_is_open_owner = 1;
1072         sop->so_id = current_ownerid++;
1073         sop->so_client = clp;
1074         sop->so_seqid = open->op_seqid;
1075         sop->so_confirmed = 0;
1076         rp = &sop->so_replay;
1077         rp->rp_status = NFSERR_SERVERFAULT;
1078         rp->rp_buflen = 0;
1079         rp->rp_buf = rp->rp_ibuf;
1080         return sop;
1081 }
1082
1083 static void
1084 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1085 {
1086         struct nfs4_stateowner *lock_sop;
1087
1088         while (!list_empty(&open_stp->st_perlockowner)) {
1089                 lock_sop = list_entry(open_stp->st_perlockowner.next,
1090                                 struct nfs4_stateowner, so_perlockowner);
1091                 /* list_del(&open_stp->st_perlockowner);  */
1092                 BUG_ON(lock_sop->so_is_open_owner);
1093                 release_stateowner(lock_sop);
1094         }
1095 }
1096
1097 static void
1098 unhash_stateowner(struct nfs4_stateowner *sop)
1099 {
1100         struct nfs4_stateid *stp;
1101
1102         list_del(&sop->so_idhash);
1103         list_del(&sop->so_strhash);
1104         if (sop->so_is_open_owner)
1105                 list_del(&sop->so_perclient);
1106         list_del(&sop->so_perlockowner);
1107         while (!list_empty(&sop->so_perfilestate)) {
1108                 stp = list_entry(sop->so_perfilestate.next,
1109                         struct nfs4_stateid, st_perfilestate);
1110                 if (sop->so_is_open_owner)
1111                         release_stateid(stp, OPEN_STATE);
1112                 else
1113                         release_stateid(stp, LOCK_STATE);
1114         }
1115 }
1116
1117 static void
1118 release_stateowner(struct nfs4_stateowner *sop)
1119 {
1120         unhash_stateowner(sop);
1121         list_del(&sop->so_close_lru);
1122         nfs4_put_stateowner(sop);
1123 }
1124
1125 static inline void
1126 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1127         struct nfs4_stateowner *sop = open->op_stateowner;
1128         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1129
1130         INIT_LIST_HEAD(&stp->st_hash);
1131         INIT_LIST_HEAD(&stp->st_perfilestate);
1132         INIT_LIST_HEAD(&stp->st_perlockowner);
1133         INIT_LIST_HEAD(&stp->st_perfile);
1134         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1135         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1136         list_add(&stp->st_perfile, &fp->fi_stateids);
1137         stp->st_stateowner = sop;
1138         get_nfs4_file(fp);
1139         stp->st_file = fp;
1140         stp->st_stateid.si_boot = boot_time;
1141         stp->st_stateid.si_stateownerid = sop->so_id;
1142         stp->st_stateid.si_fileid = fp->fi_id;
1143         stp->st_stateid.si_generation = 0;
1144         stp->st_access_bmap = 0;
1145         stp->st_deny_bmap = 0;
1146         __set_bit(open->op_share_access, &stp->st_access_bmap);
1147         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1148 }
1149
1150 static void
1151 release_stateid(struct nfs4_stateid *stp, int flags)
1152 {
1153         struct file *filp = stp->st_vfs_file;
1154
1155         list_del(&stp->st_hash);
1156         list_del(&stp->st_perfile);
1157         list_del(&stp->st_perfilestate);
1158         if (flags & OPEN_STATE) {
1159                 release_stateid_lockowners(stp);
1160                 stp->st_vfs_file = NULL;
1161                 nfsd_close(filp);
1162         } else if (flags & LOCK_STATE)
1163                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1164         put_nfs4_file(stp->st_file);
1165         kmem_cache_free(stateid_slab, stp);
1166         stp = NULL;
1167 }
1168
1169 void
1170 move_to_close_lru(struct nfs4_stateowner *sop)
1171 {
1172         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1173
1174         unhash_stateowner(sop);
1175         list_add_tail(&sop->so_close_lru, &close_lru);
1176         sop->so_time = get_seconds();
1177 }
1178
1179 void
1180 release_state_owner(struct nfs4_stateid *stp, int flag)
1181 {
1182         struct nfs4_stateowner *sop = stp->st_stateowner;
1183
1184         dprintk("NFSD: release_state_owner\n");
1185         release_stateid(stp, flag);
1186
1187         /* place unused nfs4_stateowners on so_close_lru list to be
1188          * released by the laundromat service after the lease period
1189          * to enable us to handle CLOSE replay
1190          */
1191         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1192                 move_to_close_lru(sop);
1193 }
1194
1195 static int
1196 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1197         return ((sop->so_owner.len == owner->len) &&
1198          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1199           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1200 }
1201
1202 static struct nfs4_stateowner *
1203 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1204 {
1205         struct nfs4_stateowner *so = NULL;
1206
1207         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1208                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1209                         return so;
1210         }
1211         return NULL;
1212 }
1213
1214 /* search file_hashtbl[] for file */
1215 static struct nfs4_file *
1216 find_file(struct inode *ino)
1217 {
1218         unsigned int hashval = file_hashval(ino);
1219         struct nfs4_file *fp;
1220
1221         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1222                 if (fp->fi_inode == ino) {
1223                         get_nfs4_file(fp);
1224                         return fp;
1225                 }
1226         }
1227         return NULL;
1228 }
1229
1230 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1231 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1232
1233 void
1234 set_access(unsigned int *access, unsigned long bmap) {
1235         int i;
1236
1237         *access = 0;
1238         for (i = 1; i < 4; i++) {
1239                 if (test_bit(i, &bmap))
1240                         *access |= i;
1241         }
1242 }
1243
1244 void
1245 set_deny(unsigned int *deny, unsigned long bmap) {
1246         int i;
1247
1248         *deny = 0;
1249         for (i = 0; i < 4; i++) {
1250                 if (test_bit(i, &bmap))
1251                         *deny |= i ;
1252         }
1253 }
1254
1255 static int
1256 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1257         unsigned int access, deny;
1258
1259         set_access(&access, stp->st_access_bmap);
1260         set_deny(&deny, stp->st_deny_bmap);
1261         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1262                 return 0;
1263         return 1;
1264 }
1265
1266 /*
1267  * Called to check deny when READ with all zero stateid or
1268  * WRITE with all zero or all one stateid
1269  */
1270 int
1271 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1272 {
1273         struct inode *ino = current_fh->fh_dentry->d_inode;
1274         struct nfs4_file *fp;
1275         struct nfs4_stateid *stp;
1276         int ret;
1277
1278         dprintk("NFSD: nfs4_share_conflict\n");
1279
1280         fp = find_file(ino);
1281         if (!fp)
1282                 return nfs_ok;
1283         ret = nfserr_share_denied;
1284         /* Search for conflicting share reservations */
1285         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1286                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1287                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1288                         goto out;
1289         }
1290         ret = nfs_ok;
1291 out:
1292         put_nfs4_file(fp);
1293         return ret;
1294 }
1295
1296 static inline void
1297 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1298 {
1299         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1300                 put_write_access(filp->f_dentry->d_inode);
1301                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1302         }
1303 }
1304
1305 /*
1306  * Recall a delegation
1307  */
1308 static int
1309 do_recall(void *__dp)
1310 {
1311         struct nfs4_delegation *dp = __dp;
1312
1313         daemonize("nfsv4-recall");
1314
1315         nfsd4_cb_recall(dp);
1316         return 0;
1317 }
1318
1319 /*
1320  * Spawn a thread to perform a recall on the delegation represented
1321  * by the lease (file_lock)
1322  *
1323  * Called from break_lease() with lock_kernel() held.
1324  * Note: we assume break_lease will only call this *once* for any given
1325  * lease.
1326  */
1327 static
1328 void nfsd_break_deleg_cb(struct file_lock *fl)
1329 {
1330         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1331         struct task_struct *t;
1332
1333         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1334         if (!dp)
1335                 return;
1336
1337         /* We're assuming the state code never drops its reference
1338          * without first removing the lease.  Since we're in this lease
1339          * callback (and since the lease code is serialized by the kernel
1340          * lock) we know the server hasn't removed the lease yet, we know
1341          * it's safe to take a reference: */
1342         atomic_inc(&dp->dl_count);
1343
1344         spin_lock(&recall_lock);
1345         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1346         spin_unlock(&recall_lock);
1347
1348         /* only place dl_time is set. protected by lock_kernel*/
1349         dp->dl_time = get_seconds();
1350
1351         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1352         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1353
1354         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1355         if (IS_ERR(t)) {
1356                 struct nfs4_client *clp = dp->dl_client;
1357
1358                 printk(KERN_INFO "NFSD: Callback thread failed for "
1359                         "for client (clientid %08x/%08x)\n",
1360                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1361                 nfs4_put_delegation(dp);
1362         }
1363 }
1364
1365 /*
1366  * The file_lock is being reapd.
1367  *
1368  * Called by locks_free_lock() with lock_kernel() held.
1369  */
1370 static
1371 void nfsd_release_deleg_cb(struct file_lock *fl)
1372 {
1373         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1374
1375         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1376
1377         if (!(fl->fl_flags & FL_LEASE) || !dp)
1378                 return;
1379         dp->dl_flock = NULL;
1380 }
1381
1382 /*
1383  * Set the delegation file_lock back pointer.
1384  *
1385  * Called from __setlease() with lock_kernel() held.
1386  */
1387 static
1388 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1389 {
1390         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1391
1392         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1393         if (!dp)
1394                 return;
1395         dp->dl_flock = new;
1396 }
1397
1398 /*
1399  * Called from __setlease() with lock_kernel() held
1400  */
1401 static
1402 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1403 {
1404         struct nfs4_delegation *onlistd =
1405                 (struct nfs4_delegation *)onlist->fl_owner;
1406         struct nfs4_delegation *tryd =
1407                 (struct nfs4_delegation *)try->fl_owner;
1408
1409         if (onlist->fl_lmops != try->fl_lmops)
1410                 return 0;
1411
1412         return onlistd->dl_client == tryd->dl_client;
1413 }
1414
1415
1416 static
1417 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1418 {
1419         if (arg & F_UNLCK)
1420                 return lease_modify(onlist, arg);
1421         else
1422                 return -EAGAIN;
1423 }
1424
1425 struct lock_manager_operations nfsd_lease_mng_ops = {
1426         .fl_break = nfsd_break_deleg_cb,
1427         .fl_release_private = nfsd_release_deleg_cb,
1428         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1429         .fl_mylease = nfsd_same_client_deleg_cb,
1430         .fl_change = nfsd_change_deleg_cb,
1431 };
1432
1433
1434 /*
1435  * nfsd4_process_open1()
1436  *      lookup stateowner.
1437  *              found:
1438  *                      check confirmed
1439  *                              confirmed:
1440  *                                      check seqid
1441  *                              not confirmed:
1442  *                                      delete owner
1443  *                                      create new owner
1444  *              notfound:
1445  *                      verify clientid
1446  *                      create new owner
1447  *
1448  * called with nfs4_lock_state() held.
1449  */
1450 int
1451 nfsd4_process_open1(struct nfsd4_open *open)
1452 {
1453         int status;
1454         clientid_t *clientid = &open->op_clientid;
1455         struct nfs4_client *clp = NULL;
1456         unsigned int strhashval;
1457         struct nfs4_stateowner *sop = NULL;
1458
1459         status = nfserr_inval;
1460         if (!check_name(open->op_owner))
1461                 goto out;
1462
1463         if (STALE_CLIENTID(&open->op_clientid))
1464                 return nfserr_stale_clientid;
1465
1466         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1467         sop = find_openstateowner_str(strhashval, open);
1468         if (sop) {
1469                 open->op_stateowner = sop;
1470                 /* check for replay */
1471                 if (open->op_seqid == sop->so_seqid){
1472                         if (sop->so_replay.rp_buflen)
1473                                 return NFSERR_REPLAY_ME;
1474                         else {
1475                                 /* The original OPEN failed so spectacularly
1476                                  * that we don't even have replay data saved!
1477                                  * Therefore, we have no choice but to continue
1478                                  * processing this OPEN; presumably, we'll
1479                                  * fail again for the same reason.
1480                                  */
1481                                 dprintk("nfsd4_process_open1:"
1482                                         " replay with no replay cache\n");
1483                                 goto renew;
1484                         }
1485                 } else if (sop->so_confirmed) {
1486                         if (open->op_seqid == sop->so_seqid + 1)
1487                                 goto renew;
1488                         status = nfserr_bad_seqid;
1489                         goto out;
1490                 } else {
1491                         /* If we get here, we received an OPEN for an
1492                          * unconfirmed nfs4_stateowner. Since the seqid's are
1493                          * different, purge the existing nfs4_stateowner, and
1494                          * instantiate a new one.
1495                          */
1496                         clp = sop->so_client;
1497                         release_stateowner(sop);
1498                 }
1499         } else {
1500                 /* nfs4_stateowner not found.
1501                  * Verify clientid and instantiate new nfs4_stateowner.
1502                  * If verify fails this is presumably the result of the
1503                  * client's lease expiring.
1504                  */
1505                 status = nfserr_expired;
1506                 clp = find_confirmed_client(clientid);
1507                 if (clp == NULL)
1508                         goto out;
1509         }
1510         status = nfserr_resource;
1511         sop = alloc_init_open_stateowner(strhashval, clp, open);
1512         if (sop == NULL)
1513                 goto out;
1514         open->op_stateowner = sop;
1515 renew:
1516         status = nfs_ok;
1517         renew_client(sop->so_client);
1518 out:
1519         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1520                 status = nfserr_reclaim_bad;
1521         return status;
1522 }
1523
1524 static inline int
1525 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1526 {
1527         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1528                 return nfserr_openmode;
1529         else
1530                 return nfs_ok;
1531 }
1532
1533 static struct nfs4_delegation *
1534 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1535 {
1536         struct nfs4_delegation *dp;
1537
1538         list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
1539                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1540                         return dp;
1541         }
1542         return NULL;
1543 }
1544
1545 static int
1546 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1547                 struct nfs4_delegation **dp)
1548 {
1549         int flags;
1550         int status = nfserr_bad_stateid;
1551
1552         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1553         if (*dp == NULL)
1554                 goto out;
1555         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1556                                                 RD_STATE : WR_STATE;
1557         status = nfs4_check_delegmode(*dp, flags);
1558         if (status)
1559                 *dp = NULL;
1560 out:
1561         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1562                 return nfs_ok;
1563         if (status)
1564                 return status;
1565         open->op_stateowner->so_confirmed = 1;
1566         return nfs_ok;
1567 }
1568
1569 static int
1570 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1571 {
1572         struct nfs4_stateid *local;
1573         int status = nfserr_share_denied;
1574         struct nfs4_stateowner *sop = open->op_stateowner;
1575
1576         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1577                 /* ignore lock owners */
1578                 if (local->st_stateowner->so_is_open_owner == 0)
1579                         continue;
1580                 /* remember if we have seen this open owner */
1581                 if (local->st_stateowner == sop)
1582                         *stpp = local;
1583                 /* check for conflicting share reservations */
1584                 if (!test_share(local, open))
1585                         goto out;
1586         }
1587         status = 0;
1588 out:
1589         return status;
1590 }
1591
1592 static inline struct nfs4_stateid *
1593 nfs4_alloc_stateid(void)
1594 {
1595         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1596 }
1597
1598 static int
1599 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1600                 struct nfs4_delegation *dp,
1601                 struct svc_fh *cur_fh, int flags)
1602 {
1603         struct nfs4_stateid *stp;
1604
1605         stp = nfs4_alloc_stateid();
1606         if (stp == NULL)
1607                 return nfserr_resource;
1608
1609         if (dp) {
1610                 get_file(dp->dl_vfs_file);
1611                 stp->st_vfs_file = dp->dl_vfs_file;
1612         } else {
1613                 int status;
1614                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1615                                 &stp->st_vfs_file);
1616                 if (status) {
1617                         if (status == nfserr_dropit)
1618                                 status = nfserr_jukebox;
1619                         kmem_cache_free(stateid_slab, stp);
1620                         return status;
1621                 }
1622         }
1623         *stpp = stp;
1624         return 0;
1625 }
1626
1627 static inline int
1628 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1629                 struct nfsd4_open *open)
1630 {
1631         struct iattr iattr = {
1632                 .ia_valid = ATTR_SIZE,
1633                 .ia_size = 0,
1634         };
1635         if (!open->op_truncate)
1636                 return 0;
1637         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1638                 return -EINVAL;
1639         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1640 }
1641
1642 static int
1643 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1644 {
1645         struct file *filp = stp->st_vfs_file;
1646         struct inode *inode = filp->f_dentry->d_inode;
1647         unsigned int share_access;
1648         int status;
1649
1650         set_access(&share_access, stp->st_access_bmap);
1651         share_access = ~share_access;
1652         share_access &= open->op_share_access;
1653
1654         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1655                 return nfsd4_truncate(rqstp, cur_fh, open);
1656
1657         status = get_write_access(inode);
1658         if (status)
1659                 return nfserrno(status);
1660         status = nfsd4_truncate(rqstp, cur_fh, open);
1661         if (status) {
1662                 put_write_access(inode);
1663                 return status;
1664         }
1665         /* remember the open */
1666         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1667         set_bit(open->op_share_access, &stp->st_access_bmap);
1668         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1669
1670         return nfs_ok;
1671 }
1672
1673
1674 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1675 static void
1676 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1677 {
1678         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1679                 if (*status)
1680                         *status = nfserr_reclaim_bad;
1681                 else {
1682                         open->op_stateowner->so_confirmed = 1;
1683                         open->op_stateowner->so_seqid--;
1684                 }
1685         }
1686 }
1687
1688 /*
1689  * Attempt to hand out a delegation.
1690  */
1691 static void
1692 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1693 {
1694         struct nfs4_delegation *dp;
1695         struct nfs4_stateowner *sop = stp->st_stateowner;
1696         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1697         struct file_lock fl, *flp = &fl;
1698         int status, flag = 0;
1699
1700         flag = NFS4_OPEN_DELEGATE_NONE;
1701         open->op_recall = 0;
1702         switch (open->op_claim_type) {
1703                 case NFS4_OPEN_CLAIM_PREVIOUS:
1704                         if (!atomic_read(&cb->cb_set))
1705                                 open->op_recall = 1;
1706                         flag = open->op_delegate_type;
1707                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1708                                 goto out;
1709                         break;
1710                 case NFS4_OPEN_CLAIM_NULL:
1711                         /* Let's not give out any delegations till everyone's
1712                          * had the chance to reclaim theirs.... */
1713                         if (nfs4_in_grace())
1714                                 goto out;
1715                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1716                                 goto out;
1717                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1718                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1719                         else
1720                                 flag = NFS4_OPEN_DELEGATE_READ;
1721                         break;
1722                 default:
1723                         goto out;
1724         }
1725
1726         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1727         if (dp == NULL) {
1728                 flag = NFS4_OPEN_DELEGATE_NONE;
1729                 goto out;
1730         }
1731         locks_init_lock(&fl);
1732         fl.fl_lmops = &nfsd_lease_mng_ops;
1733         fl.fl_flags = FL_LEASE;
1734         fl.fl_end = OFFSET_MAX;
1735         fl.fl_owner =  (fl_owner_t)dp;
1736         fl.fl_file = stp->st_vfs_file;
1737         fl.fl_pid = current->tgid;
1738
1739         /* setlease checks to see if delegation should be handed out.
1740          * the lock_manager callbacks fl_mylease and fl_change are used
1741          */
1742         if ((status = setlease(stp->st_vfs_file,
1743                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1744                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1745                 unhash_delegation(dp);
1746                 flag = NFS4_OPEN_DELEGATE_NONE;
1747                 goto out;
1748         }
1749
1750         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1751
1752         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1753                      dp->dl_stateid.si_boot,
1754                      dp->dl_stateid.si_stateownerid,
1755                      dp->dl_stateid.si_fileid,
1756                      dp->dl_stateid.si_generation);
1757 out:
1758         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1759                         && flag == NFS4_OPEN_DELEGATE_NONE
1760                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1761                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1762         open->op_delegate_type = flag;
1763 }
1764
1765 /*
1766  * called with nfs4_lock_state() held.
1767  */
1768 int
1769 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1770 {
1771         struct nfs4_file *fp = NULL;
1772         struct inode *ino = current_fh->fh_dentry->d_inode;
1773         struct nfs4_stateid *stp = NULL;
1774         struct nfs4_delegation *dp = NULL;
1775         int status;
1776
1777         status = nfserr_inval;
1778         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1779                 goto out;
1780         /*
1781          * Lookup file; if found, lookup stateid and check open request,
1782          * and check for delegations in the process of being recalled.
1783          * If not found, create the nfs4_file struct
1784          */
1785         fp = find_file(ino);
1786         if (fp) {
1787                 if ((status = nfs4_check_open(fp, open, &stp)))
1788                         goto out;
1789                 status = nfs4_check_deleg(fp, open, &dp);
1790                 if (status)
1791                         goto out;
1792         } else {
1793                 status = nfserr_bad_stateid;
1794                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1795                         goto out;
1796                 status = nfserr_resource;
1797                 fp = alloc_init_file(ino);
1798                 if (fp == NULL)
1799                         goto out;
1800         }
1801
1802         /*
1803          * OPEN the file, or upgrade an existing OPEN.
1804          * If truncate fails, the OPEN fails.
1805          */
1806         if (stp) {
1807                 /* Stateid was found, this is an OPEN upgrade */
1808                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1809                 if (status)
1810                         goto out;
1811         } else {
1812                 /* Stateid was not found, this is a new OPEN */
1813                 int flags = 0;
1814                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1815                         flags = MAY_WRITE;
1816                 else
1817                         flags = MAY_READ;
1818                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1819                 if (status)
1820                         goto out;
1821                 init_stateid(stp, fp, open);
1822                 status = nfsd4_truncate(rqstp, current_fh, open);
1823                 if (status) {
1824                         release_stateid(stp, OPEN_STATE);
1825                         goto out;
1826                 }
1827         }
1828         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1829
1830         /*
1831         * Attempt to hand out a delegation. No error return, because the
1832         * OPEN succeeds even if we fail.
1833         */
1834         nfs4_open_delegation(current_fh, open, stp);
1835
1836         status = nfs_ok;
1837
1838         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1839                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1840                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1841 out:
1842         if (fp)
1843                 put_nfs4_file(fp);
1844         /* CLAIM_PREVIOUS has different error returns */
1845         nfs4_set_claim_prev(open, &status);
1846         /*
1847         * To finish the open response, we just need to set the rflags.
1848         */
1849         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1850         if (!open->op_stateowner->so_confirmed)
1851                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1852
1853         return status;
1854 }
1855
1856 static struct workqueue_struct *laundry_wq;
1857 static struct work_struct laundromat_work;
1858 static void laundromat_main(void *);
1859 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1860
1861 int
1862 nfsd4_renew(clientid_t *clid)
1863 {
1864         struct nfs4_client *clp;
1865         int status;
1866
1867         nfs4_lock_state();
1868         dprintk("process_renew(%08x/%08x): starting\n",
1869                         clid->cl_boot, clid->cl_id);
1870         status = nfserr_stale_clientid;
1871         if (STALE_CLIENTID(clid))
1872                 goto out;
1873         clp = find_confirmed_client(clid);
1874         status = nfserr_expired;
1875         if (clp == NULL) {
1876                 /* We assume the client took too long to RENEW. */
1877                 dprintk("nfsd4_renew: clientid not found!\n");
1878                 goto out;
1879         }
1880         renew_client(clp);
1881         status = nfserr_cb_path_down;
1882         if (!list_empty(&clp->cl_del_perclnt)
1883                         && !atomic_read(&clp->cl_callback.cb_set))
1884                 goto out;
1885         status = nfs_ok;
1886 out:
1887         nfs4_unlock_state();
1888         return status;
1889 }
1890
1891 time_t
1892 nfs4_laundromat(void)
1893 {
1894         struct nfs4_client *clp;
1895         struct nfs4_stateowner *sop;
1896         struct nfs4_delegation *dp;
1897         struct list_head *pos, *next, reaplist;
1898         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1899         time_t t, clientid_val = NFSD_LEASE_TIME;
1900         time_t u, test_val = NFSD_LEASE_TIME;
1901
1902         nfs4_lock_state();
1903
1904         dprintk("NFSD: laundromat service - starting\n");
1905         list_for_each_safe(pos, next, &client_lru) {
1906                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1907                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1908                         t = clp->cl_time - cutoff;
1909                         if (clientid_val > t)
1910                                 clientid_val = t;
1911                         break;
1912                 }
1913                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1914                         clp->cl_clientid.cl_id);
1915                 expire_client(clp);
1916         }
1917         INIT_LIST_HEAD(&reaplist);
1918         spin_lock(&recall_lock);
1919         list_for_each_safe(pos, next, &del_recall_lru) {
1920                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1921                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1922                         u = dp->dl_time - cutoff;
1923                         if (test_val > u)
1924                                 test_val = u;
1925                         break;
1926                 }
1927                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1928                                     dp, dp->dl_flock);
1929                 list_move(&dp->dl_recall_lru, &reaplist);
1930         }
1931         spin_unlock(&recall_lock);
1932         list_for_each_safe(pos, next, &reaplist) {
1933                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1934                 list_del_init(&dp->dl_recall_lru);
1935                 unhash_delegation(dp);
1936         }
1937         test_val = NFSD_LEASE_TIME;
1938         list_for_each_safe(pos, next, &close_lru) {
1939                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1940                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1941                         u = sop->so_time - cutoff;
1942                         if (test_val > u)
1943                                 test_val = u;
1944                         break;
1945                 }
1946                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1947                         sop->so_id);
1948                 list_del(&sop->so_close_lru);
1949                 nfs4_put_stateowner(sop);
1950         }
1951         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1952                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1953         nfs4_unlock_state();
1954         return clientid_val;
1955 }
1956
1957 void
1958 laundromat_main(void *not_used)
1959 {
1960         time_t t;
1961
1962         t = nfs4_laundromat();
1963         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1964         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1965 }
1966
1967 /* search ownerid_hashtbl[] and close_lru for stateid owner
1968  * (stateid->si_stateownerid)
1969  */
1970 struct nfs4_stateowner *
1971 find_openstateowner_id(u32 st_id, int flags) {
1972         struct nfs4_stateowner *local = NULL;
1973
1974         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1975         if (flags & CLOSE_STATE) {
1976                 list_for_each_entry(local, &close_lru, so_close_lru) {
1977                         if (local->so_id == st_id)
1978                                 return local;
1979                 }
1980         }
1981         return NULL;
1982 }
1983
1984 static inline int
1985 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1986 {
1987         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1988 }
1989
1990 static int
1991 STALE_STATEID(stateid_t *stateid)
1992 {
1993         if (stateid->si_boot == boot_time)
1994                 return 0;
1995         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1996                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1997                 stateid->si_generation);
1998         return 1;
1999 }
2000
2001 static inline int
2002 access_permit_read(unsigned long access_bmap)
2003 {
2004         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2005                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2006                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2007 }
2008
2009 static inline int
2010 access_permit_write(unsigned long access_bmap)
2011 {
2012         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2013                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2014 }
2015
2016 static
2017 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2018 {
2019         int status = nfserr_openmode;
2020
2021         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2022                 goto out;
2023         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2024                 goto out;
2025         status = nfs_ok;
2026 out:
2027         return status;
2028 }
2029
2030 static inline int
2031 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2032 {
2033         /* Trying to call delegreturn with a special stateid? Yuch: */
2034         if (!(flags & (RD_STATE | WR_STATE)))
2035                 return nfserr_bad_stateid;
2036         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2037                 return nfs_ok;
2038         else if (nfs4_in_grace()) {
2039                 /* Answer in remaining cases depends on existance of
2040                  * conflicting state; so we must wait out the grace period. */
2041                 return nfserr_grace;
2042         } else if (flags & WR_STATE)
2043                 return nfs4_share_conflict(current_fh,
2044                                 NFS4_SHARE_DENY_WRITE);
2045         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2046                 return nfs4_share_conflict(current_fh,
2047                                 NFS4_SHARE_DENY_READ);
2048 }
2049
2050 /*
2051  * Allow READ/WRITE during grace period on recovered state only for files
2052  * that are not able to provide mandatory locking.
2053  */
2054 static inline int
2055 io_during_grace_disallowed(struct inode *inode, int flags)
2056 {
2057         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2058                 && MANDATORY_LOCK(inode);
2059 }
2060
2061 /*
2062 * Checks for stateid operations
2063 */
2064 int
2065 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2066 {
2067         struct nfs4_stateid *stp = NULL;
2068         struct nfs4_delegation *dp = NULL;
2069         stateid_t *stidp;
2070         struct inode *ino = current_fh->fh_dentry->d_inode;
2071         int status;
2072
2073         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2074                 stateid->si_boot, stateid->si_stateownerid,
2075                 stateid->si_fileid, stateid->si_generation);
2076         if (filpp)
2077                 *filpp = NULL;
2078
2079         if (io_during_grace_disallowed(ino, flags))
2080                 return nfserr_grace;
2081
2082         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2083                 return check_special_stateids(current_fh, stateid, flags);
2084
2085         /* STALE STATEID */
2086         status = nfserr_stale_stateid;
2087         if (STALE_STATEID(stateid))
2088                 goto out;
2089
2090         /* BAD STATEID */
2091         status = nfserr_bad_stateid;
2092         if (!stateid->si_fileid) { /* delegation stateid */
2093                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2094                         dprintk("NFSD: delegation stateid not found\n");
2095                         if (nfs4_in_grace())
2096                                 status = nfserr_grace;
2097                         goto out;
2098                 }
2099                 stidp = &dp->dl_stateid;
2100         } else { /* open or lock stateid */
2101                 if (!(stp = find_stateid(stateid, flags))) {
2102                         dprintk("NFSD: open or lock stateid not found\n");
2103                         if (nfs4_in_grace())
2104                                 status = nfserr_grace;
2105                         goto out;
2106                 }
2107                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2108                         goto out;
2109                 if (!stp->st_stateowner->so_confirmed)
2110                         goto out;
2111                 stidp = &stp->st_stateid;
2112         }
2113         if (stateid->si_generation > stidp->si_generation)
2114                 goto out;
2115
2116         /* OLD STATEID */
2117         status = nfserr_old_stateid;
2118         if (stateid->si_generation < stidp->si_generation)
2119                 goto out;
2120         if (stp) {
2121                 if ((status = nfs4_check_openmode(stp,flags)))
2122                         goto out;
2123                 renew_client(stp->st_stateowner->so_client);
2124                 if (filpp)
2125                         *filpp = stp->st_vfs_file;
2126         } else if (dp) {
2127                 if ((status = nfs4_check_delegmode(dp, flags)))
2128                         goto out;
2129                 renew_client(dp->dl_client);
2130                 if (flags & DELEG_RET)
2131                         unhash_delegation(dp);
2132                 if (filpp)
2133                         *filpp = dp->dl_vfs_file;
2134         }
2135         status = nfs_ok;
2136 out:
2137         return status;
2138 }
2139
2140
2141 /*
2142  * Checks for sequence id mutating operations.
2143  */
2144 int
2145 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
2146 {
2147         int status;
2148         struct nfs4_stateid *stp;
2149         struct nfs4_stateowner *sop;
2150
2151         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2152                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2153                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2154                 stateid->si_generation);
2155
2156         *stpp = NULL;
2157         *sopp = NULL;
2158
2159         status = nfserr_bad_stateid;
2160         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2161                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2162                 goto out;
2163         }
2164
2165         status = nfserr_stale_stateid;
2166         if (STALE_STATEID(stateid))
2167                 goto out;
2168         /*
2169         * We return BAD_STATEID if filehandle doesn't match stateid,
2170         * the confirmed flag is incorrecly set, or the generation
2171         * number is incorrect.
2172         * If there is no entry in the openfile table for this id,
2173         * we can't always return BAD_STATEID;
2174         * this might be a retransmitted CLOSE which has arrived after
2175         * the openfile has been released.
2176         */
2177         if (!(stp = find_stateid(stateid, flags)))
2178                 goto no_nfs4_stateid;
2179
2180         status = nfserr_bad_stateid;
2181
2182         /* for new lock stateowners:
2183          * check that the lock->v.new.open_stateid
2184          * refers to an open stateowner
2185          *
2186          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2187          * as the open_stateid->st_stateowner->so_client->clientid
2188          */
2189         if (lockclid) {
2190                 struct nfs4_stateowner *sop = stp->st_stateowner;
2191                 struct nfs4_client *clp = sop->so_client;
2192
2193                 if (!sop->so_is_open_owner)
2194                         goto out;
2195                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2196                         goto out;
2197         }
2198
2199         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2200                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2201                 goto out;
2202         }
2203
2204         *stpp = stp;
2205         *sopp = sop = stp->st_stateowner;
2206
2207         /*
2208         *  We now validate the seqid and stateid generation numbers.
2209         *  For the moment, we ignore the possibility of
2210         *  generation number wraparound.
2211         */
2212         if (seqid != sop->so_seqid + 1)
2213                 goto check_replay;
2214
2215         if (sop->so_confirmed) {
2216                 if (flags & CONFIRM) {
2217                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2218                         goto out;
2219                 }
2220         }
2221         else {
2222                 if (!(flags & CONFIRM)) {
2223                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2224                         goto out;
2225                 }
2226         }
2227         if (stateid->si_generation > stp->st_stateid.si_generation) {
2228                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2229                 goto out;
2230         }
2231
2232         status = nfserr_old_stateid;
2233         if (stateid->si_generation < stp->st_stateid.si_generation) {
2234                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2235                 goto out;
2236         }
2237         /* XXX renew the client lease here */
2238         status = nfs_ok;
2239
2240 out:
2241         return status;
2242
2243 no_nfs4_stateid:
2244
2245         /*
2246         * We determine whether this is a bad stateid or a replay,
2247         * starting by trying to look up the stateowner.
2248         * If stateowner is not found - stateid is bad.
2249         */
2250         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2251                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2252                 status = nfserr_bad_stateid;
2253                 goto out;
2254         }
2255         *sopp = sop;
2256
2257 check_replay:
2258         if (seqid == sop->so_seqid) {
2259                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2260                 /* indicate replay to calling function */
2261                 status = NFSERR_REPLAY_ME;
2262         } else  {
2263                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2264
2265                 *sopp = NULL;
2266                 status = nfserr_bad_seqid;
2267         }
2268         goto out;
2269 }
2270
2271 int
2272 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2273 {
2274         int status;
2275         struct nfs4_stateowner *sop;
2276         struct nfs4_stateid *stp;
2277
2278         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2279                         (int)current_fh->fh_dentry->d_name.len,
2280                         current_fh->fh_dentry->d_name.name);
2281
2282         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2283                 goto out;
2284
2285         nfs4_lock_state();
2286
2287         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2288                                         &oc->oc_req_stateid,
2289                                         CHECK_FH | CONFIRM | OPEN_STATE,
2290                                         &oc->oc_stateowner, &stp, NULL)))
2291                 goto out;
2292
2293         sop = oc->oc_stateowner;
2294         sop->so_confirmed = 1;
2295         update_stateid(&stp->st_stateid);
2296         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2297         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2298                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2299                          stp->st_stateid.si_boot,
2300                          stp->st_stateid.si_stateownerid,
2301                          stp->st_stateid.si_fileid,
2302                          stp->st_stateid.si_generation);
2303 out:
2304         if (oc->oc_stateowner)
2305                 nfs4_get_stateowner(oc->oc_stateowner);
2306         nfs4_unlock_state();
2307         return status;
2308 }
2309
2310
2311 /*
2312  * unset all bits in union bitmap (bmap) that
2313  * do not exist in share (from successful OPEN_DOWNGRADE)
2314  */
2315 static void
2316 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2317 {
2318         int i;
2319         for (i = 1; i < 4; i++) {
2320                 if ((i & access) != i)
2321                         __clear_bit(i, bmap);
2322         }
2323 }
2324
2325 static void
2326 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2327 {
2328         int i;
2329         for (i = 0; i < 4; i++) {
2330                 if ((i & deny) != i)
2331                         __clear_bit(i, bmap);
2332         }
2333 }
2334
2335 int
2336 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2337 {
2338         int status;
2339         struct nfs4_stateid *stp;
2340         unsigned int share_access;
2341
2342         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2343                         (int)current_fh->fh_dentry->d_name.len,
2344                         current_fh->fh_dentry->d_name.name);
2345
2346         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2347                 return nfserr_inval;
2348
2349         nfs4_lock_state();
2350         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2351                                         &od->od_stateid,
2352                                         CHECK_FH | OPEN_STATE,
2353                                         &od->od_stateowner, &stp, NULL)))
2354                 goto out;
2355
2356         status = nfserr_inval;
2357         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2358                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2359                         stp->st_access_bmap, od->od_share_access);
2360                 goto out;
2361         }
2362         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2363                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2364                         stp->st_deny_bmap, od->od_share_deny);
2365                 goto out;
2366         }
2367         set_access(&share_access, stp->st_access_bmap);
2368         nfs4_file_downgrade(stp->st_vfs_file,
2369                             share_access & ~od->od_share_access);
2370
2371         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2372         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2373
2374         update_stateid(&stp->st_stateid);
2375         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2376         status = nfs_ok;
2377 out:
2378         if (od->od_stateowner)
2379                 nfs4_get_stateowner(od->od_stateowner);
2380         nfs4_unlock_state();
2381         return status;
2382 }
2383
2384 /*
2385  * nfs4_unlock_state() called after encode
2386  */
2387 int
2388 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2389 {
2390         int status;
2391         struct nfs4_stateid *stp;
2392
2393         dprintk("NFSD: nfsd4_close on file %.*s\n",
2394                         (int)current_fh->fh_dentry->d_name.len,
2395                         current_fh->fh_dentry->d_name.name);
2396
2397         nfs4_lock_state();
2398         /* check close_lru for replay */
2399         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2400                                         &close->cl_stateid,
2401                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2402                                         &close->cl_stateowner, &stp, NULL)))
2403                 goto out;
2404         /*
2405         *  Return success, but first update the stateid.
2406         */
2407         status = nfs_ok;
2408         update_stateid(&stp->st_stateid);
2409         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2410
2411         /* release_state_owner() calls nfsd_close() if needed */
2412         release_state_owner(stp, OPEN_STATE);
2413 out:
2414         if (close->cl_stateowner)
2415                 nfs4_get_stateowner(close->cl_stateowner);
2416         nfs4_unlock_state();
2417         return status;
2418 }
2419
2420 int
2421 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2422 {
2423         int status;
2424
2425         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2426                 goto out;
2427
2428         nfs4_lock_state();
2429         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2430         nfs4_unlock_state();
2431 out:
2432         return status;
2433 }
2434
2435
2436 /*
2437  * Lock owner state (byte-range locks)
2438  */
2439 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2440 #define LOCK_HASH_BITS              8
2441 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2442 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2443
2444 #define lockownerid_hashval(id) \
2445         ((id) & LOCK_HASH_MASK)
2446
2447 static inline unsigned int
2448 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2449                 struct xdr_netobj *ownername)
2450 {
2451         return (file_hashval(inode) + cl_id
2452                         + opaque_hashval(ownername->data, ownername->len))
2453                 & LOCK_HASH_MASK;
2454 }
2455
2456 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2457 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2458 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2459
2460 struct nfs4_stateid *
2461 find_stateid(stateid_t *stid, int flags)
2462 {
2463         struct nfs4_stateid *local = NULL;
2464         u32 st_id = stid->si_stateownerid;
2465         u32 f_id = stid->si_fileid;
2466         unsigned int hashval;
2467
2468         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2469         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2470                 hashval = stateid_hashval(st_id, f_id);
2471                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2472                         if ((local->st_stateid.si_stateownerid == st_id) &&
2473                             (local->st_stateid.si_fileid == f_id))
2474                                 return local;
2475                 }
2476         }
2477         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2478                 hashval = stateid_hashval(st_id, f_id);
2479                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2480                         if ((local->st_stateid.si_stateownerid == st_id) &&
2481                             (local->st_stateid.si_fileid == f_id))
2482                                 return local;
2483                 }
2484         } else
2485                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2486         return NULL;
2487 }
2488
2489 static struct nfs4_delegation *
2490 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2491 {
2492         struct nfs4_file *fp;
2493         struct nfs4_delegation *dl;
2494
2495         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2496                     stid->si_boot, stid->si_stateownerid,
2497                     stid->si_fileid, stid->si_generation);
2498
2499         fp = find_file(ino);
2500         if (!fp)
2501                 return NULL;
2502         dl = find_delegation_file(fp, stid);
2503         put_nfs4_file(fp);
2504         return dl;
2505 }
2506
2507 /*
2508  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2509  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2510  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2511  * locking, this prevents us from being completely protocol-compliant.  The
2512  * real solution to this problem is to start using unsigned file offsets in
2513  * the VFS, but this is a very deep change!
2514  */
2515 static inline void
2516 nfs4_transform_lock_offset(struct file_lock *lock)
2517 {
2518         if (lock->fl_start < 0)
2519                 lock->fl_start = OFFSET_MAX;
2520         if (lock->fl_end < 0)
2521                 lock->fl_end = OFFSET_MAX;
2522 }
2523
2524 int
2525 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2526 {
2527         struct nfs4_stateowner *local = NULL;
2528         int status = 0;
2529
2530         if (hashval >= LOCK_HASH_SIZE)
2531                 goto out;
2532         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2533                 if (local == sop) {
2534                         status = 1;
2535                         goto out;
2536                 }
2537         }
2538 out:
2539         return status;
2540 }
2541
2542
2543 static inline void
2544 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2545 {
2546         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2547         unsigned int hval = lockownerid_hashval(sop->so_id);
2548
2549         deny->ld_sop = NULL;
2550         if (nfs4_verify_lock_stateowner(sop, hval)) {
2551                 kref_get(&sop->so_ref);
2552                 deny->ld_sop = sop;
2553                 deny->ld_clientid = sop->so_client->cl_clientid;
2554         }
2555         deny->ld_start = fl->fl_start;
2556         deny->ld_length = ~(u64)0;
2557         if (fl->fl_end != ~(u64)0)
2558                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2559         deny->ld_type = NFS4_READ_LT;
2560         if (fl->fl_type != F_RDLCK)
2561                 deny->ld_type = NFS4_WRITE_LT;
2562 }
2563
2564 static struct nfs4_stateowner *
2565 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2566 {
2567         struct nfs4_stateowner *local = NULL;
2568         int i;
2569
2570         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2571                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2572                         if (!cmp_owner_str(local, owner, clid))
2573                                 continue;
2574                         return local;
2575                 }
2576         }
2577         return NULL;
2578 }
2579
2580 static struct nfs4_stateowner *
2581 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2582                 struct xdr_netobj *owner)
2583 {
2584         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2585         struct nfs4_stateowner *op;
2586
2587         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2588                 if (cmp_owner_str(op, owner, clid))
2589                         return op;
2590         }
2591         return NULL;
2592 }
2593
2594 /*
2595  * Alloc a lock owner structure.
2596  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2597  * occured.
2598  *
2599  * strhashval = lock_ownerstr_hashval
2600  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2601  */
2602
2603 static struct nfs4_stateowner *
2604 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2605         struct nfs4_stateowner *sop;
2606         struct nfs4_replay *rp;
2607         unsigned int idhashval;
2608
2609         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2610                 return NULL;
2611         idhashval = lockownerid_hashval(current_ownerid);
2612         INIT_LIST_HEAD(&sop->so_idhash);
2613         INIT_LIST_HEAD(&sop->so_strhash);
2614         INIT_LIST_HEAD(&sop->so_perclient);
2615         INIT_LIST_HEAD(&sop->so_perfilestate);
2616         INIT_LIST_HEAD(&sop->so_perlockowner);
2617         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2618         sop->so_time = 0;
2619         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2620         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2621         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2622         sop->so_is_open_owner = 0;
2623         sop->so_id = current_ownerid++;
2624         sop->so_client = clp;
2625         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2626         sop->so_confirmed = 1;
2627         rp = &sop->so_replay;
2628         rp->rp_status = NFSERR_SERVERFAULT;
2629         rp->rp_buflen = 0;
2630         rp->rp_buf = rp->rp_ibuf;
2631         return sop;
2632 }
2633
2634 struct nfs4_stateid *
2635 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2636 {
2637         struct nfs4_stateid *stp;
2638         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2639
2640         stp = nfs4_alloc_stateid();
2641         if (stp == NULL)
2642                 goto out;
2643         INIT_LIST_HEAD(&stp->st_hash);
2644         INIT_LIST_HEAD(&stp->st_perfile);
2645         INIT_LIST_HEAD(&stp->st_perfilestate);
2646         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2647         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2648         list_add(&stp->st_perfile, &fp->fi_stateids);
2649         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2650         stp->st_stateowner = sop;
2651         get_nfs4_file(fp);
2652         stp->st_file = fp;
2653         stp->st_stateid.si_boot = boot_time;
2654         stp->st_stateid.si_stateownerid = sop->so_id;
2655         stp->st_stateid.si_fileid = fp->fi_id;
2656         stp->st_stateid.si_generation = 0;
2657         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2658         stp->st_access_bmap = open_stp->st_access_bmap;
2659         stp->st_deny_bmap = open_stp->st_deny_bmap;
2660
2661 out:
2662         return stp;
2663 }
2664
2665 int
2666 check_lock_length(u64 offset, u64 length)
2667 {
2668         return ((length == 0)  || ((length != ~(u64)0) &&
2669              LOFF_OVERFLOW(offset, length)));
2670 }
2671
2672 /*
2673  *  LOCK operation
2674  */
2675 int
2676 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2677 {
2678         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2679         struct nfs4_stateid *lock_stp;
2680         struct file *filp;
2681         struct file_lock file_lock;
2682         struct file_lock *conflock;
2683         int status = 0;
2684         unsigned int strhashval;
2685
2686         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2687                 (long long) lock->lk_offset,
2688                 (long long) lock->lk_length);
2689
2690         if (nfs4_in_grace() && !lock->lk_reclaim)
2691                 return nfserr_grace;
2692         if (!nfs4_in_grace() && lock->lk_reclaim)
2693                 return nfserr_no_grace;
2694
2695         if (check_lock_length(lock->lk_offset, lock->lk_length))
2696                  return nfserr_inval;
2697
2698         nfs4_lock_state();
2699
2700         if (lock->lk_is_new) {
2701         /*
2702          * Client indicates that this is a new lockowner.
2703          * Use open owner and open stateid to create lock owner and lock
2704          * stateid.
2705          */
2706                 struct nfs4_stateid *open_stp = NULL;
2707                 struct nfs4_file *fp;
2708
2709                 status = nfserr_stale_clientid;
2710                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2711                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2712                         goto out;
2713                 }
2714
2715                 /* is the new lock seqid presented by the client zero? */
2716                 status = nfserr_bad_seqid;
2717                 if (lock->v.new.lock_seqid != 0)
2718                         goto out;
2719
2720                 /* validate and update open stateid and open seqid */
2721                 status = nfs4_preprocess_seqid_op(current_fh,
2722                                         lock->lk_new_open_seqid,
2723                                         &lock->lk_new_open_stateid,
2724                                         CHECK_FH | OPEN_STATE,
2725                                         &open_sop, &open_stp,
2726                                         &lock->v.new.clientid);
2727                 if (status) {
2728                         if (lock->lk_reclaim)
2729                                 status = nfserr_reclaim_bad;
2730                         goto out;
2731                 }
2732                 /* create lockowner and lock stateid */
2733                 fp = open_stp->st_file;
2734                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2735                                 open_sop->so_client->cl_clientid.cl_id,
2736                                 &lock->v.new.owner);
2737                 /*
2738                  * If we already have this lock owner, the client is in
2739                  * error (or our bookeeping is wrong!)
2740                  * for asking for a 'new lock'.
2741                  */
2742                 status = nfserr_bad_stateid;
2743                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2744                                                 &lock->v.new.clientid);
2745                 if (lock_sop)
2746                         goto out;
2747                 status = nfserr_resource;
2748                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2749                         goto out;
2750                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2751                                                 fp, open_stp)) == NULL) {
2752                         release_stateowner(lock->lk_stateowner);
2753                         lock->lk_stateowner = NULL;
2754                         goto out;
2755                 }
2756                 /* bump the open seqid used to create the lock */
2757                 open_sop->so_seqid++;
2758         } else {
2759                 /* lock (lock owner + lock stateid) already exists */
2760                 status = nfs4_preprocess_seqid_op(current_fh,
2761                                        lock->lk_old_lock_seqid,
2762                                        &lock->lk_old_lock_stateid,
2763                                        CHECK_FH | LOCK_STATE,
2764                                        &lock->lk_stateowner, &lock_stp, NULL);
2765                 if (status)
2766                         goto out;
2767         }
2768         /* lock->lk_stateowner and lock_stp have been created or found */
2769         filp = lock_stp->st_vfs_file;
2770
2771         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2772                 printk("NFSD: nfsd4_lock: permission denied!\n");
2773                 goto out;
2774         }
2775
2776         locks_init_lock(&file_lock);
2777         switch (lock->lk_type) {
2778                 case NFS4_READ_LT:
2779                 case NFS4_READW_LT:
2780                         file_lock.fl_type = F_RDLCK;
2781                 break;
2782                 case NFS4_WRITE_LT:
2783                 case NFS4_WRITEW_LT:
2784                         file_lock.fl_type = F_WRLCK;
2785                 break;
2786                 default:
2787                         status = nfserr_inval;
2788                 goto out;
2789         }
2790         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2791         file_lock.fl_pid = current->tgid;
2792         file_lock.fl_file = filp;
2793         file_lock.fl_flags = FL_POSIX;
2794
2795         file_lock.fl_start = lock->lk_offset;
2796         if ((lock->lk_length == ~(u64)0) ||
2797                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2798                 file_lock.fl_end = ~(u64)0;
2799         else
2800                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2801         nfs4_transform_lock_offset(&file_lock);
2802
2803         /*
2804         * Try to lock the file in the VFS.
2805         * Note: locks.c uses the BKL to protect the inode's lock list.
2806         */
2807
2808         status = posix_lock_file(filp, &file_lock);
2809         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2810                 file_lock.fl_ops->fl_release_private(&file_lock);
2811         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2812         switch (-status) {
2813         case 0: /* success! */
2814                 update_stateid(&lock_stp->st_stateid);
2815                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2816                                 sizeof(stateid_t));
2817                 goto out;
2818         case (EAGAIN):
2819                 goto conflicting_lock;
2820         case (EDEADLK):
2821                 status = nfserr_deadlock;
2822         default:
2823                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2824                 goto out_destroy_new_stateid;
2825         }
2826
2827 conflicting_lock:
2828         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2829         status = nfserr_denied;
2830         /* XXX There is a race here. Future patch needed to provide
2831          * an atomic posix_lock_and_test_file
2832          */
2833         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2834                 status = nfserr_serverfault;
2835                 goto out;
2836         }
2837         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2838
2839 out_destroy_new_stateid:
2840         if (lock->lk_is_new) {
2841                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2842         /*
2843         * An error encountered after instantiation of the new
2844         * stateid has forced us to destroy it.
2845         */
2846                 if (!seqid_mutating_err(status))
2847                         open_sop->so_seqid--;
2848
2849                 release_state_owner(lock_stp, LOCK_STATE);
2850         }
2851 out:
2852         if (lock->lk_stateowner)
2853                 nfs4_get_stateowner(lock->lk_stateowner);
2854         nfs4_unlock_state();
2855         return status;
2856 }
2857
2858 /*
2859  * LOCKT operation
2860  */
2861 int
2862 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2863 {
2864         struct inode *inode;
2865         struct file file;
2866         struct file_lock file_lock;
2867         struct file_lock *conflicting_lock;
2868         int status;
2869
2870         if (nfs4_in_grace())
2871                 return nfserr_grace;
2872
2873         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2874                  return nfserr_inval;
2875
2876         lockt->lt_stateowner = NULL;
2877         nfs4_lock_state();
2878
2879         status = nfserr_stale_clientid;
2880         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2881                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2882                 goto out;
2883         }
2884
2885         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2886                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2887                 if (status == nfserr_symlink)
2888                         status = nfserr_inval;
2889                 goto out;
2890         }
2891
2892         inode = current_fh->fh_dentry->d_inode;
2893         locks_init_lock(&file_lock);
2894         switch (lockt->lt_type) {
2895                 case NFS4_READ_LT:
2896                 case NFS4_READW_LT:
2897                         file_lock.fl_type = F_RDLCK;
2898                 break;
2899                 case NFS4_WRITE_LT:
2900                 case NFS4_WRITEW_LT:
2901                         file_lock.fl_type = F_WRLCK;
2902                 break;
2903                 default:
2904                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2905                         status = nfserr_inval;
2906                 goto out;
2907         }
2908
2909         lockt->lt_stateowner = find_lockstateowner_str(inode,
2910                         &lockt->lt_clientid, &lockt->lt_owner);
2911         if (lockt->lt_stateowner)
2912                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2913         file_lock.fl_pid = current->tgid;
2914         file_lock.fl_flags = FL_POSIX;
2915
2916         file_lock.fl_start = lockt->lt_offset;
2917         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2918                 file_lock.fl_end = ~(u64)0;
2919         else
2920                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2921
2922         nfs4_transform_lock_offset(&file_lock);
2923
2924         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2925          * since LOCKT doesn't require an OPEN, and therefore a struct
2926          * file may not exist, pass posix_test_lock a struct file with
2927          * only the dentry:inode set.
2928          */
2929         memset(&file, 0, sizeof (struct file));
2930         file.f_dentry = current_fh->fh_dentry;
2931
2932         status = nfs_ok;
2933         conflicting_lock = posix_test_lock(&file, &file_lock);
2934         if (conflicting_lock) {
2935                 status = nfserr_denied;
2936                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2937         }
2938 out:
2939         nfs4_unlock_state();
2940         return status;
2941 }
2942
2943 int
2944 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2945 {
2946         struct nfs4_stateid *stp;
2947         struct file *filp = NULL;
2948         struct file_lock file_lock;
2949         int status;
2950
2951         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2952                 (long long) locku->lu_offset,
2953                 (long long) locku->lu_length);
2954
2955         if (check_lock_length(locku->lu_offset, locku->lu_length))
2956                  return nfserr_inval;
2957
2958         nfs4_lock_state();
2959
2960         if ((status = nfs4_preprocess_seqid_op(current_fh,
2961                                         locku->lu_seqid,
2962                                         &locku->lu_stateid,
2963                                         CHECK_FH | LOCK_STATE,
2964                                         &locku->lu_stateowner, &stp, NULL)))
2965                 goto out;
2966
2967         filp = stp->st_vfs_file;
2968         BUG_ON(!filp);
2969         locks_init_lock(&file_lock);
2970         file_lock.fl_type = F_UNLCK;
2971         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2972         file_lock.fl_pid = current->tgid;
2973         file_lock.fl_file = filp;
2974         file_lock.fl_flags = FL_POSIX;
2975         file_lock.fl_start = locku->lu_offset;
2976
2977         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2978                 file_lock.fl_end = ~(u64)0;
2979         else
2980                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2981         nfs4_transform_lock_offset(&file_lock);
2982
2983         /*
2984         *  Try to unlock the file in the VFS.
2985         */
2986         status = posix_lock_file(filp, &file_lock);
2987         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2988                 file_lock.fl_ops->fl_release_private(&file_lock);
2989         if (status) {
2990                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2991                 goto out_nfserr;
2992         }
2993         /*
2994         * OK, unlock succeeded; the only thing left to do is update the stateid.
2995         */
2996         update_stateid(&stp->st_stateid);
2997         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2998
2999 out:
3000         if (locku->lu_stateowner)
3001                 nfs4_get_stateowner(locku->lu_stateowner);
3002         nfs4_unlock_state();
3003         return status;
3004
3005 out_nfserr:
3006         status = nfserrno(status);
3007         goto out;
3008 }
3009
3010 /*
3011  * returns
3012  *      1: locks held by lockowner
3013  *      0: no locks held by lockowner
3014  */
3015 static int
3016 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3017 {
3018         struct file_lock **flpp;
3019         struct inode *inode = filp->f_dentry->d_inode;
3020         int status = 0;
3021
3022         lock_kernel();
3023         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3024                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3025                         status = 1;
3026                         goto out;
3027         }
3028 out:
3029         unlock_kernel();
3030         return status;
3031 }
3032
3033 int
3034 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3035 {
3036         clientid_t *clid = &rlockowner->rl_clientid;
3037         struct nfs4_stateowner *local = NULL;
3038         struct xdr_netobj *owner = &rlockowner->rl_owner;
3039         int status;
3040
3041         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3042                 clid->cl_boot, clid->cl_id);
3043
3044         /* XXX check for lease expiration */
3045
3046         status = nfserr_stale_clientid;
3047         if (STALE_CLIENTID(clid)) {
3048                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3049                 return status;
3050         }
3051
3052         nfs4_lock_state();
3053
3054         status = nfs_ok;
3055         local = find_lockstateowner(owner, clid);
3056         if (local) {
3057                 struct nfs4_stateid *stp;
3058
3059                 /* check for any locks held by any stateid
3060                  * associated with the (lock) stateowner */
3061                 status = nfserr_locks_held;
3062                 list_for_each_entry(stp, &local->so_perfilestate,
3063                                 st_perfilestate) {
3064                         if (check_for_locks(stp->st_vfs_file, local))
3065                                 goto out;
3066                 }
3067                 /* no locks held by (lock) stateowner */
3068                 status = nfs_ok;
3069                 release_stateowner(local);
3070         }
3071 out:
3072         nfs4_unlock_state();
3073         return status;
3074 }
3075
3076 static inline struct nfs4_client_reclaim *
3077 alloc_reclaim(int namelen)
3078 {
3079         struct nfs4_client_reclaim *crp = NULL;
3080
3081         crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3082         if (!crp)
3083                 return NULL;
3084         crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3085         if (!crp->cr_name.data) {
3086                 kfree(crp);
3087                 return NULL;
3088         }
3089         return crp;
3090 }
3091
3092 /*
3093  * failure => all reset bets are off, nfserr_no_grace...
3094  */
3095 static int
3096 nfs4_client_to_reclaim(char *name, int namlen)
3097 {
3098         unsigned int strhashval;
3099         struct nfs4_client_reclaim *crp = NULL;
3100
3101         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3102         crp = alloc_reclaim(namlen);
3103         if (!crp)
3104                 return 0;
3105         strhashval = clientstr_hashval(name, namlen);
3106         INIT_LIST_HEAD(&crp->cr_strhash);
3107         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3108         memcpy(crp->cr_name.data, name, namlen);
3109         crp->cr_name.len = namlen;
3110         reclaim_str_hashtbl_size++;
3111         return 1;
3112 }
3113
3114 static void
3115 nfs4_release_reclaim(void)
3116 {
3117         struct nfs4_client_reclaim *crp = NULL;
3118         int i;
3119
3120         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3121                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3122                         crp = list_entry(reclaim_str_hashtbl[i].next,
3123                                         struct nfs4_client_reclaim, cr_strhash);
3124                         list_del(&crp->cr_strhash);
3125                         kfree(crp->cr_name.data);
3126                         kfree(crp);
3127                         reclaim_str_hashtbl_size--;
3128                 }
3129         }
3130         BUG_ON(reclaim_str_hashtbl_size);
3131 }
3132
3133 /*
3134  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3135 struct nfs4_client_reclaim *
3136 nfs4_find_reclaim_client(clientid_t *clid)
3137 {
3138         unsigned int strhashval;
3139         struct nfs4_client *clp;
3140         struct nfs4_client_reclaim *crp = NULL;
3141
3142
3143         /* find clientid in conf_id_hashtbl */
3144         clp = find_confirmed_client(clid);
3145         if (clp == NULL)
3146                 return NULL;
3147
3148         dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3149                             clp->cl_name.len, clp->cl_name.data);
3150
3151         /* find clp->cl_name in reclaim_str_hashtbl */
3152         strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3153         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3154                 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3155                         return crp;
3156                 }
3157         }
3158         return NULL;
3159 }
3160
3161 /*
3162 * Called from OPEN. Look for clientid in reclaim list.
3163 */
3164 int
3165 nfs4_check_open_reclaim(clientid_t *clid)
3166 {
3167         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3168 }
3169
3170 /* initialization to perform at module load time: */
3171
3172 void
3173 nfs4_state_init(void)
3174 {
3175         int i;
3176
3177         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3178                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3179                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3180                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3181                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3182         }
3183         for (i = 0; i < FILE_HASH_SIZE; i++) {
3184                 INIT_LIST_HEAD(&file_hashtbl[i]);
3185         }
3186         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3187                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3188                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3189         }
3190         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3191                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3192                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3193         }
3194         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3195                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3196                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3197         }
3198         memset(&onestateid, ~0, sizeof(stateid_t));
3199         INIT_LIST_HEAD(&close_lru);
3200         INIT_LIST_HEAD(&client_lru);
3201         INIT_LIST_HEAD(&del_recall_lru);
3202         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3203                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3204         reclaim_str_hashtbl_size = 0;
3205 }
3206
3207 /* initialization to perform when the nfsd service is started: */
3208
3209 static void
3210 __nfs4_state_start(void)
3211 {
3212         time_t grace_time;
3213
3214         boot_time = get_seconds();
3215         grace_time = max(user_lease_time, lease_time);
3216         lease_time = user_lease_time;
3217         printk("NFSD: starting %ld-second grace period\n", grace_time);
3218         grace_end = boot_time + grace_time;
3219         laundry_wq = create_singlethread_workqueue("nfsd4");
3220         queue_delayed_work(laundry_wq, &laundromat_work, NFSD_LEASE_TIME*HZ);
3221 }
3222
3223 int
3224 nfs4_state_start(void)
3225 {
3226         int status;
3227
3228         if (nfs4_init)
3229                 return 0;
3230         status = nfsd4_init_slabs();
3231         if (status)
3232                 return status;
3233         __nfs4_state_start();
3234         nfs4_init = 1;
3235         return 0;
3236 }
3237
3238 int
3239 nfs4_in_grace(void)
3240 {
3241         return get_seconds() < grace_end;
3242 }
3243
3244 void
3245 set_no_grace(void)
3246 {
3247         printk("NFSD: ERROR in reboot recovery.  State reclaims will fail.\n");
3248         grace_end = get_seconds();
3249 }
3250
3251 time_t
3252 nfs4_lease_time(void)
3253 {
3254         return lease_time;
3255 }
3256
3257 static void
3258 __nfs4_state_shutdown(void)
3259 {
3260         int i;
3261         struct nfs4_client *clp = NULL;
3262         struct nfs4_delegation *dp = NULL;
3263         struct nfs4_stateowner *sop = NULL;
3264         struct list_head *pos, *next, reaplist;
3265
3266         list_for_each_safe(pos, next, &close_lru) {
3267                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3268                 list_del(&sop->so_close_lru);
3269                 nfs4_put_stateowner(sop);
3270         }
3271
3272         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3273                 while (!list_empty(&conf_id_hashtbl[i])) {
3274                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3275                         expire_client(clp);
3276                 }
3277                 while (!list_empty(&unconf_str_hashtbl[i])) {
3278                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3279                         expire_client(clp);
3280                 }
3281         }
3282         INIT_LIST_HEAD(&reaplist);
3283         spin_lock(&recall_lock);
3284         list_for_each_safe(pos, next, &del_recall_lru) {
3285                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3286                 list_move(&dp->dl_recall_lru, &reaplist);
3287         }
3288         spin_unlock(&recall_lock);
3289         list_for_each_safe(pos, next, &reaplist) {
3290                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3291                 list_del_init(&dp->dl_recall_lru);
3292                 unhash_delegation(dp);
3293         }
3294
3295         cancel_delayed_work(&laundromat_work);
3296         flush_workqueue(laundry_wq);
3297         destroy_workqueue(laundry_wq);
3298         nfs4_init = 0;
3299 }
3300
3301 void
3302 nfs4_state_shutdown(void)
3303 {
3304         nfs4_lock_state();
3305         nfs4_release_reclaim();
3306         __nfs4_state_shutdown();
3307         nfsd4_free_slabs();
3308         nfs4_unlock_state();
3309 }
3310
3311 /*
3312  * Called when leasetime is changed.
3313  *
3314  * The only way the protocol gives us to handle on-the-fly lease changes is to
3315  * simulate a reboot.  Instead of doing that, we just wait till the next time
3316  * we start to register any changes in lease time.  If the administrator
3317  * really wants to change the lease time *now*, they can go ahead and bring
3318  * nfsd down and then back up again after changing the lease time.
3319  */
3320 void
3321 nfs4_reset_lease(time_t leasetime)
3322 {
3323         lock_kernel();
3324         user_lease_time = leasetime;
3325         unlock_kernel();
3326 }