git.oblomov.eu Git - linux-2.6/blob - fs/nfsd/nfs4state.c

   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 old_lease_time = 90; /* past incarnation lease time */
  57 static u32 nfs4_reclaim_init = 0;
  58 time_t boot_time;
  59 static time_t grace_end = 0;
  60 static u32 current_clientid = 1;
  61 static u32 current_ownerid = 1;
  62 static u32 current_fileid = 1;
  63 static u32 current_delegid = 1;
  64 static u32 nfs4_init;
  65 stateid_t zerostateid;             /* bits all 0 */
  66 stateid_t onestateid;              /* bits all 1 */
  67
  68 /* debug counters */
  69 u32 list_add_perfile = 0;
  70 u32 list_del_perfile = 0;
  71 u32 add_perclient = 0;
  72 u32 del_perclient = 0;
  73 u32 alloc_file = 0;
  74 u32 free_file = 0;
  75 u32 vfsopen = 0;
  76 u32 vfsclose = 0;
  77 u32 alloc_delegation= 0;
  78 u32 free_delegation= 0;
  79
  80 /* forward declarations */
  81 struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  82 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  83 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  84
  85 /* Locking:
  86  *
  87  * client_sema:
  88  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  89  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  90  */
  91 static DECLARE_MUTEX(client_sema);
  92
  93 void
  94 nfs4_lock_state(void)
  95 {
  96         down(&client_sema);
  97 }
  98
  99 void
 100 nfs4_unlock_state(void)
 101 {
 102         up(&client_sema);
 103 }
 104
 105 static inline u32
 106 opaque_hashval(const void *ptr, int nbytes)
 107 {
 108         unsigned char *cptr = (unsigned char *) ptr;
 109
 110         u32 x = 0;
 111         while (nbytes--) {
 112                 x *= 37;
 113                 x += *cptr++;
 114         }
 115         return x;
 116 }
 117
 118 /* forward declarations */
 119 static void release_stateowner(struct nfs4_stateowner *sop);
 120 static void release_stateid(struct nfs4_stateid *stp, int flags);
 121 static void release_file(struct nfs4_file *fp);
 122
 123 /*
 124  * Delegation state
 125  */
 126
 127 /* recall_lock protects the del_recall_lru */
 128 spinlock_t recall_lock;
 129 static struct list_head del_recall_lru;
 130
 131 static struct nfs4_delegation *
 132 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 133 {
 134         struct nfs4_delegation *dp;
 135         struct nfs4_file *fp = stp->st_file;
 136         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 137
 138         dprintk("NFSD alloc_init_deleg\n");
 139         if ((dp = kmalloc(sizeof(struct nfs4_delegation),
 140                 GFP_KERNEL)) == NULL)
 141                 return dp;
 142         INIT_LIST_HEAD(&dp->dl_del_perfile);
 143         INIT_LIST_HEAD(&dp->dl_del_perclnt);
 144         INIT_LIST_HEAD(&dp->dl_recall_lru);
 145         dp->dl_client = clp;
 146         dp->dl_file = fp;
 147         dp->dl_flock = NULL;
 148         get_file(stp->st_vfs_file);
 149         dp->dl_vfs_file = stp->st_vfs_file;
 150         dp->dl_type = type;
 151         dp->dl_recall.cbr_dp = NULL;
 152         dp->dl_recall.cbr_ident = cb->cb_ident;
 153         dp->dl_recall.cbr_trunc = 0;
 154         dp->dl_stateid.si_boot = boot_time;
 155         dp->dl_stateid.si_stateownerid = current_delegid++;
 156         dp->dl_stateid.si_fileid = 0;
 157         dp->dl_stateid.si_generation = 0;
 158         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 159         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 160                         current_fh->fh_handle.fh_size);
 161         dp->dl_time = 0;
 162         atomic_set(&dp->dl_count, 1);
 163         list_add(&dp->dl_del_perfile, &fp->fi_del_perfile);
 164         list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
 165         alloc_delegation++;
 166         return dp;
 167 }
 168
 169 void
 170 nfs4_put_delegation(struct nfs4_delegation *dp)
 171 {
 172         if (atomic_dec_and_test(&dp->dl_count)) {
 173                 dprintk("NFSD: freeing dp %p\n",dp);
 174                 kfree(dp);
 175                 free_delegation++;
 176         }
 177 }
 178
 179 /* Remove the associated file_lock first, then remove the delegation.
 180  * lease_modify() is called to remove the FS_LEASE file_lock from
 181  * the i_flock list, eventually calling nfsd's lock_manager
 182  * fl_release_callback.
 183  */
 184 static void
 185 nfs4_close_delegation(struct nfs4_delegation *dp)
 186 {
 187         struct file *filp = dp->dl_vfs_file;
 188
 189         dprintk("NFSD: close_delegation dp %p\n",dp);
 190         dp->dl_vfs_file = NULL;
 191         /* The following nfsd_close may not actually close the file,
 192          * but we want to remove the lease in any case. */
 193         if (dp->dl_flock)
 194                 setlease(filp, F_UNLCK, &dp->dl_flock);
 195         nfsd_close(filp);
 196         vfsclose++;
 197 }
 198
 199 /* Called under the state lock. */
 200 static void
 201 unhash_delegation(struct nfs4_delegation *dp)
 202 {
 203         list_del_init(&dp->dl_del_perfile);
 204         list_del_init(&dp->dl_del_perclnt);
 205         spin_lock(&recall_lock);
 206         list_del_init(&dp->dl_recall_lru);
 207         spin_unlock(&recall_lock);
 208         nfs4_close_delegation(dp);
 209         nfs4_put_delegation(dp);
 210 }
 211
 212 /*
 213  * SETCLIENTID state
 214  */
 215
 216 /* Hash tables for nfs4_clientid state */
 217 #define CLIENT_HASH_BITS                 4
 218 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 219 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 220
 221 #define clientid_hashval(id) \
 222         ((id) & CLIENT_HASH_MASK)
 223 #define clientstr_hashval(name, namelen) \
 224         (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
 225 /*
 226  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 227  * used in reboot/reset lease grace period processing
 228  *
 229  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 230  * setclientid_confirmed info.
 231  *
 232  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 233  * setclientid info.
 234  *
 235  * client_lru holds client queue ordered by nfs4_client.cl_time
 236  * for lease renewal.
 237  *
 238  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 239  * for last close replay.
 240  */
 241 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 242 static int reclaim_str_hashtbl_size = 0;
 243 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 244 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 245 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 246 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 247 static struct list_head client_lru;
 248 static struct list_head close_lru;
 249
 250 static inline void
 251 renew_client(struct nfs4_client *clp)
 252 {
 253         /*
 254         * Move client to the end to the LRU list.
 255         */
 256         dprintk("renewing client (clientid %08x/%08x)\n",
 257                         clp->cl_clientid.cl_boot,
 258                         clp->cl_clientid.cl_id);
 259         list_move_tail(&clp->cl_lru, &client_lru);
 260         clp->cl_time = get_seconds();
 261 }
 262
 263 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 264 static int
 265 STALE_CLIENTID(clientid_t *clid)
 266 {
 267         if (clid->cl_boot == boot_time)
 268                 return 0;
 269         dprintk("NFSD stale clientid (%08x/%08x)\n",
 270                         clid->cl_boot, clid->cl_id);
 271         return 1;
 272 }
 273
 274 /*
 275  * XXX Should we use a slab cache ?
 276  * This type of memory management is somewhat inefficient, but we use it
 277  * anyway since SETCLIENTID is not a common operation.
 278  */
 279 static inline struct nfs4_client *
 280 alloc_client(struct xdr_netobj name)
 281 {
 282         struct nfs4_client *clp;
 283
 284         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 285                 memset(clp, 0, sizeof(*clp));
 286                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 287                         memcpy(clp->cl_name.data, name.data, name.len);
 288                         clp->cl_name.len = name.len;
 289                 }
 290                 else {
 291                         kfree(clp);
 292                         clp = NULL;
 293                 }
 294         }
 295         return clp;
 296 }
 297
 298 static inline void
 299 free_client(struct nfs4_client *clp)
 300 {
 301         if (clp->cl_cred.cr_group_info)
 302                 put_group_info(clp->cl_cred.cr_group_info);
 303         kfree(clp->cl_name.data);
 304         kfree(clp);
 305 }
 306
 307 void
 308 put_nfs4_client(struct nfs4_client *clp)
 309 {
 310         if (atomic_dec_and_test(&clp->cl_count))
 311                 free_client(clp);
 312 }
 313
 314 static void
 315 expire_client(struct nfs4_client *clp)
 316 {
 317         struct nfs4_stateowner *sop;
 318         struct nfs4_delegation *dp;
 319         struct nfs4_callback *cb = &clp->cl_callback;
 320         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 321         struct list_head reaplist;
 322
 323         dprintk("NFSD: expire_client cl_count %d\n",
 324                             atomic_read(&clp->cl_count));
 325
 326         /* shutdown rpc client, ending any outstanding recall rpcs */
 327         if (atomic_read(&cb->cb_set) == 1 && clnt) {
 328                 rpc_shutdown_client(clnt);
 329                 clnt = clp->cl_callback.cb_client = NULL;
 330         }
 331
 332         INIT_LIST_HEAD(&reaplist);
 333         spin_lock(&recall_lock);
 334         while (!list_empty(&clp->cl_del_perclnt)) {
 335                 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
 336                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 337                                 dp->dl_flock);
 338                 list_del_init(&dp->dl_del_perclnt);
 339                 list_move(&dp->dl_recall_lru, &reaplist);
 340         }
 341         spin_unlock(&recall_lock);
 342         while (!list_empty(&reaplist)) {
 343                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 344                 list_del_init(&dp->dl_recall_lru);
 345                 unhash_delegation(dp);
 346         }
 347         list_del(&clp->cl_idhash);
 348         list_del(&clp->cl_strhash);
 349         list_del(&clp->cl_lru);
 350         while (!list_empty(&clp->cl_perclient)) {
 351                 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
 352                 release_stateowner(sop);
 353         }
 354         put_nfs4_client(clp);
 355 }
 356
 357 static struct nfs4_client *
 358 create_client(struct xdr_netobj name) {
 359         struct nfs4_client *clp;
 360
 361         if (!(clp = alloc_client(name)))
 362                 goto out;
 363         atomic_set(&clp->cl_count, 1);
 364         atomic_set(&clp->cl_callback.cb_set, 0);
 365         clp->cl_callback.cb_parsed = 0;
 366         INIT_LIST_HEAD(&clp->cl_idhash);
 367         INIT_LIST_HEAD(&clp->cl_strhash);
 368         INIT_LIST_HEAD(&clp->cl_perclient);
 369         INIT_LIST_HEAD(&clp->cl_del_perclnt);
 370         INIT_LIST_HEAD(&clp->cl_lru);
 371 out:
 372         return clp;
 373 }
 374
 375 static void
 376 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 377         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 378 }
 379
 380 static void
 381 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 382         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 383         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 384 }
 385
 386 static void
 387 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 388
 389         target->cr_uid = source->cr_uid;
 390         target->cr_gid = source->cr_gid;
 391         target->cr_group_info = source->cr_group_info;
 392         get_group_info(target->cr_group_info);
 393 }
 394
 395 static int
 396 cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
 397         if (!n1 || !n2)
 398                 return 0;
 399         return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
 400 }
 401
 402 static int
 403 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 404         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 405 }
 406
 407 static int
 408 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 409         return((cl1->cl_boot == cl2->cl_boot) &&
 410                 (cl1->cl_id == cl2->cl_id));
 411 }
 412
 413 /* XXX what about NGROUP */
 414 static int
 415 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 416         return(cr1->cr_uid == cr2->cr_uid);
 417
 418 }
 419
 420 static void
 421 gen_clid(struct nfs4_client *clp) {
 422         clp->cl_clientid.cl_boot = boot_time;
 423         clp->cl_clientid.cl_id = current_clientid++;
 424 }
 425
 426 static void
 427 gen_confirm(struct nfs4_client *clp) {
 428         struct timespec         tv;
 429         u32 *                   p;
 430
 431         tv = CURRENT_TIME;
 432         p = (u32 *)clp->cl_confirm.data;
 433         *p++ = tv.tv_sec;
 434         *p++ = tv.tv_nsec;
 435 }
 436
 437 static int
 438 check_name(struct xdr_netobj name) {
 439
 440         if (name.len == 0)
 441                 return 0;
 442         if (name.len > NFS4_OPAQUE_LIMIT) {
 443                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 444                 return 0;
 445         }
 446         return 1;
 447 }
 448
 449 void
 450 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 451 {
 452         unsigned int idhashval;
 453
 454         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 455         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 456         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 457         list_add_tail(&clp->cl_lru, &client_lru);
 458         clp->cl_time = get_seconds();
 459 }
 460
 461 void
 462 move_to_confirmed(struct nfs4_client *clp)
 463 {
 464         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 465         unsigned int strhashval;
 466
 467         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 468         list_del_init(&clp->cl_strhash);
 469         list_del_init(&clp->cl_idhash);
 470         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 471         strhashval = clientstr_hashval(clp->cl_name.data,
 472                         clp->cl_name.len);
 473         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 474         renew_client(clp);
 475 }
 476
 477 static struct nfs4_client *
 478 find_confirmed_client(clientid_t *clid)
 479 {
 480         struct nfs4_client *clp;
 481         unsigned int idhashval = clientid_hashval(clid->cl_id);
 482
 483         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 484                 if (cmp_clid(&clp->cl_clientid, clid))
 485                         return clp;
 486         }
 487         return NULL;
 488 }
 489
 490 static struct nfs4_client *
 491 find_unconfirmed_client(clientid_t *clid)
 492 {
 493         struct nfs4_client *clp;
 494         unsigned int idhashval = clientid_hashval(clid->cl_id);
 495
 496         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 497                 if (cmp_clid(&clp->cl_clientid, clid))
 498                         return clp;
 499         }
 500         return NULL;
 501 }
 502
 503 /* a helper function for parse_callback */
 504 static int
 505 parse_octet(unsigned int *lenp, char **addrp)
 506 {
 507         unsigned int len = *lenp;
 508         char *p = *addrp;
 509         int n = -1;
 510         char c;
 511
 512         for (;;) {
 513                 if (!len)
 514                         break;
 515                 len--;
 516                 c = *p++;
 517                 if (c == '.')
 518                         break;
 519                 if ((c < '0') || (c > '9')) {
 520                         n = -1;
 521                         break;
 522                 }
 523                 if (n < 0)
 524                         n = 0;
 525                 n = (n * 10) + (c - '0');
 526                 if (n > 255) {
 527                         n = -1;
 528                         break;
 529                 }
 530         }
 531         *lenp = len;
 532         *addrp = p;
 533         return n;
 534 }
 535
 536 /* parse and set the setclientid ipv4 callback address */
 537 int
 538 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 539 {
 540         int temp = 0;
 541         u32 cbaddr = 0;
 542         u16 cbport = 0;
 543         u32 addrlen = addr_len;
 544         char *addr = addr_val;
 545         int i, shift;
 546
 547         /* ipaddress */
 548         shift = 24;
 549         for(i = 4; i > 0  ; i--) {
 550                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 551                         return 0;
 552                 }
 553                 cbaddr |= (temp << shift);
 554                 if (shift > 0)
 555                 shift -= 8;
 556         }
 557         *cbaddrp = cbaddr;
 558
 559         /* port */
 560         shift = 8;
 561         for(i = 2; i > 0  ; i--) {
 562                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 563                         return 0;
 564                 }
 565                 cbport |= (temp << shift);
 566                 if (shift > 0)
 567                         shift -= 8;
 568         }
 569         *cbportp = cbport;
 570         return 1;
 571 }
 572
 573 void
 574 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 575 {
 576         struct nfs4_callback *cb = &clp->cl_callback;
 577
 578         /* Currently, we only support tcp for the callback channel */
 579         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 580                 goto out_err;
 581
 582         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 583                          &cb->cb_addr, &cb->cb_port)))
 584                 goto out_err;
 585         cb->cb_prog = se->se_callback_prog;
 586         cb->cb_ident = se->se_callback_ident;
 587         cb->cb_parsed = 1;
 588         return;
 589 out_err:
 590         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 591                 "will not receive delegations\n",
 592                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 593
 594         cb->cb_parsed = 0;
 595         return;
 596 }
 597
 598 /*
 599  * RFC 3010 has a complex implmentation description of processing a
 600  * SETCLIENTID request consisting of 5 bullets, labeled as
 601  * CASE0 - CASE4 below.
 602  *
 603  * NOTES:
 604  *      callback information will be processed in a future patch
 605  *
 606  *      an unconfirmed record is added when:
 607  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 608  *      CASE 1: confirmed record found with matching name, principal,
 609  *              verifier, and clientid.
 610  *      CASE 2: confirmed record found with matching name, principal,
 611  *              and there is no unconfirmed record with matching
 612  *              name and principal
 613  *
 614  *      an unconfirmed record is replaced when:
 615  *      CASE 3: confirmed record found with matching name, principal,
 616  *              and an unconfirmed record is found with matching
 617  *              name, principal, and with clientid and
 618  *              confirm that does not match the confirmed record.
 619  *      CASE 4: there is no confirmed record with matching name and
 620  *              principal. there is an unconfirmed record with
 621  *              matching name, principal.
 622  *
 623  *      an unconfirmed record is deleted when:
 624  *      CASE 1: an unconfirmed record that matches input name, verifier,
 625  *              and confirmed clientid.
 626  *      CASE 4: any unconfirmed records with matching name and principal
 627  *              that exist after an unconfirmed record has been replaced
 628  *              as described above.
 629  *
 630  */
 631 int
 632 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 633 {
 634         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 635         struct xdr_netobj       clname = {
 636                 .len = setclid->se_namelen,
 637                 .data = setclid->se_name,
 638         };
 639         nfs4_verifier           clverifier = setclid->se_verf;
 640         unsigned int            strhashval;
 641         struct nfs4_client *    conf, * unconf, * new, * clp;
 642         int                     status;
 643
 644         status = nfserr_inval;
 645         if (!check_name(clname))
 646                 goto out;
 647
 648         /*
 649          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 650          * We get here on a DRC miss.
 651          */
 652
 653         strhashval = clientstr_hashval(clname.data, clname.len);
 654
 655         conf = NULL;
 656         nfs4_lock_state();
 657         list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
 658                 if (!cmp_name(&clp->cl_name, &clname))
 659                         continue;
 660                 /*
 661                  * CASE 0:
 662                  * clname match, confirmed, different principal
 663                  * or different ip_address
 664                  */
 665                 status = nfserr_clid_inuse;
 666                 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
 667                         printk("NFSD: setclientid: string in use by client"
 668                         "(clientid %08x/%08x)\n",
 669                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 670                         goto out;
 671                 }
 672                 if (clp->cl_addr != ip_addr) {
 673                         printk("NFSD: setclientid: string in use by client"
 674                         "(clientid %08x/%08x)\n",
 675                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 676                         goto out;
 677                 }
 678
 679                 /*
 680                  * cl_name match from a previous SETCLIENTID operation
 681                  * XXX check for additional matches?
 682                  */
 683                 conf = clp;
 684                 break;
 685         }
 686         unconf = NULL;
 687         list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
 688                 if (!cmp_name(&clp->cl_name, &clname))
 689                         continue;
 690                 /* cl_name match from a previous SETCLIENTID operation */
 691                 unconf = clp;
 692                 break;
 693         }
 694         status = nfserr_resource;
 695         if (!conf) {
 696                 /*
 697                  * CASE 4:
 698                  * placed first, because it is the normal case.
 699                  */
 700                 if (unconf)
 701                         expire_client(unconf);
 702                 if (!(new = create_client(clname)))
 703                         goto out;
 704                 copy_verf(new, &clverifier);
 705                 new->cl_addr = ip_addr;
 706                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 707                 gen_clid(new);
 708                 gen_confirm(new);
 709                 gen_callback(new, setclid);
 710                 add_to_unconfirmed(new, strhashval);
 711         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 712                 /*
 713                  * CASE 1:
 714                  * cl_name match, confirmed, principal match
 715                  * verifier match: probable callback update
 716                  *
 717                  * remove any unconfirmed nfs4_client with
 718                  * matching cl_name, cl_verifier, and cl_clientid
 719                  *
 720                  * create and insert an unconfirmed nfs4_client with same
 721                  * cl_name, cl_verifier, and cl_clientid as existing
 722                  * nfs4_client,  but with the new callback info and a
 723                  * new cl_confirm
 724                  */
 725                 if ((unconf) &&
 726                     cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
 727                      cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
 728                                 expire_client(unconf);
 729                 }
 730                 if (!(new = create_client(clname)))
 731                         goto out;
 732                 copy_verf(new,&conf->cl_verifier);
 733                 new->cl_addr = ip_addr;
 734                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 735                 copy_clid(new, conf);
 736                 gen_confirm(new);
 737                 gen_callback(new, setclid);
 738                 add_to_unconfirmed(new,strhashval);
 739         } else if (!unconf) {
 740                 /*
 741                  * CASE 2:
 742                  * clname match, confirmed, principal match
 743                  * verfier does not match
 744                  * no unconfirmed. create a new unconfirmed nfs4_client
 745                  * using input clverifier, clname, and callback info
 746                  * and generate a new cl_clientid and cl_confirm.
 747                  */
 748                 if (!(new = create_client(clname)))
 749                         goto out;
 750                 copy_verf(new,&clverifier);
 751                 new->cl_addr = ip_addr;
 752                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 753                 gen_clid(new);
 754                 gen_confirm(new);
 755                 gen_callback(new, setclid);
 756                 add_to_unconfirmed(new, strhashval);
 757         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 758                 /*
 759                  * CASE3:
 760                  * confirmed found (name, principal match)
 761                  * confirmed verifier does not match input clverifier
 762                  *
 763                  * unconfirmed found (name match)
 764                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 765                  *
 766                  * remove unconfirmed.
 767                  *
 768                  * create an unconfirmed nfs4_client
 769                  * with same cl_name as existing confirmed nfs4_client,
 770                  * but with new callback info, new cl_clientid,
 771                  * new cl_verifier and a new cl_confirm
 772                  */
 773                 expire_client(unconf);
 774                 if (!(new = create_client(clname)))
 775                         goto out;
 776                 copy_verf(new,&clverifier);
 777                 new->cl_addr = ip_addr;
 778                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 779                 gen_clid(new);
 780                 gen_confirm(new);
 781                 gen_callback(new, setclid);
 782                 add_to_unconfirmed(new, strhashval);
 783         } else {
 784                 /* No cases hit !!! */
 785                 status = nfserr_inval;
 786                 goto out;
 787
 788         }
 789         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 790         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 791         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 792         status = nfs_ok;
 793 out:
 794         nfs4_unlock_state();
 795         return status;
 796 }
 797
 798
 799 /*
 800  * RFC 3010 has a complex implmentation description of processing a
 801  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 802  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 803  *
 804  * NOTE: callback information will be processed here in a future patch
 805  */
 806 int
 807 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 808 {
 809         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 810         struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
 811         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 812         clientid_t * clid = &setclientid_confirm->sc_clientid;
 813         int status;
 814
 815         if (STALE_CLIENTID(clid))
 816                 return nfserr_stale_clientid;
 817         /*
 818          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 819          * We get here on a DRC miss.
 820          */
 821
 822         nfs4_lock_state();
 823         clp = find_confirmed_client(clid);
 824         if (clp) {
 825                 status = nfserr_inval;
 826                 /*
 827                  * Found a record for this clientid. If the IP addresses
 828                  * don't match, return ERR_INVAL just as if the record had
 829                  * not been found.
 830                  */
 831                 if (clp->cl_addr != ip_addr) {
 832                         printk("NFSD: setclientid: string in use by client"
 833                         "(clientid %08x/%08x)\n",
 834                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 835                         goto out;
 836                 }
 837                 conf = clp;
 838         }
 839         clp = find_unconfirmed_client(clid);
 840         if (clp) {
 841                 status = nfserr_inval;
 842                 if (clp->cl_addr != ip_addr) {
 843                         printk("NFSD: setclientid: string in use by client"
 844                         "(clientid %08x/%08x)\n",
 845                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 846                         goto out;
 847                 }
 848                 unconf = clp;
 849         }
 850         /* CASE 1:
 851         * unconf record that matches input clientid and input confirm.
 852         * conf record that matches input clientid.
 853         * conf  and unconf records match names, verifiers
 854         */
 855         if ((conf && unconf) &&
 856             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 857             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 858             (cmp_name(&conf->cl_name,&unconf->cl_name))  &&
 859             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 860                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 861                         status = nfserr_clid_inuse;
 862                 else {
 863                         expire_client(conf);
 864                         clp = unconf;
 865                         move_to_confirmed(unconf);
 866                         status = nfs_ok;
 867                 }
 868                 goto out;
 869         }
 870         /* CASE 2:
 871          * conf record that matches input clientid.
 872          * if unconf record that matches input clientid, then unconf->cl_name
 873          * or unconf->cl_verifier don't match the conf record.
 874          */
 875         if ((conf && !unconf) ||
 876             ((conf && unconf) &&
 877              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 878               !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
 879                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 880                         status = nfserr_clid_inuse;
 881                 } else {
 882                         clp = conf;
 883                         status = nfs_ok;
 884                 }
 885                 goto out;
 886         }
 887         /* CASE 3:
 888          * conf record not found.
 889          * unconf record found.
 890          * unconf->cl_confirm matches input confirm
 891          */
 892         if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
 893                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 894                         status = nfserr_clid_inuse;
 895                 } else {
 896                         status = nfs_ok;
 897                         clp = unconf;
 898                         move_to_confirmed(unconf);
 899                 }
 900                 goto out;
 901         }
 902         /* CASE 4:
 903          * conf record not found, or if conf, then conf->cl_confirm does not
 904          * match input confirm.
 905          * unconf record not found, or if unconf, then unconf->cl_confirm
 906          * does not match input confirm.
 907          */
 908         if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
 909             (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
 910                 status = nfserr_stale_clientid;
 911                 goto out;
 912         }
 913         /* check that we have hit one of the cases...*/
 914         status = nfserr_inval;
 915         goto out;
 916 out:
 917         if (!status)
 918                 nfsd4_probe_callback(clp);
 919         nfs4_unlock_state();
 920         return status;
 921 }
 922
 923 /*
 924  * Open owner state (share locks)
 925  */
 926
 927 /* hash tables for nfs4_stateowner */
 928 #define OWNER_HASH_BITS              8
 929 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 930 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 931
 932 #define ownerid_hashval(id) \
 933         ((id) & OWNER_HASH_MASK)
 934 #define ownerstr_hashval(clientid, ownername) \
 935         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 936
 937 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 938 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 939
 940 /* hash table for nfs4_file */
 941 #define FILE_HASH_BITS                   8
 942 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 943 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 944 /* hash table for (open)nfs4_stateid */
 945 #define STATEID_HASH_BITS              10
 946 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 947 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 948
 949 #define file_hashval(x) \
 950         hash_ptr(x, FILE_HASH_BITS)
 951 #define stateid_hashval(owner_id, file_id)  \
 952         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 953
 954 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 955 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 956
 957 /* OPEN Share state helper functions */
 958 static inline struct nfs4_file *
 959 alloc_init_file(struct inode *ino)
 960 {
 961         struct nfs4_file *fp;
 962         unsigned int hashval = file_hashval(ino);
 963
 964         if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
 965                 INIT_LIST_HEAD(&fp->fi_hash);
 966                 INIT_LIST_HEAD(&fp->fi_perfile);
 967                 INIT_LIST_HEAD(&fp->fi_del_perfile);
 968                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 969                 fp->fi_inode = igrab(ino);
 970                 fp->fi_id = current_fileid++;
 971                 alloc_file++;
 972                 return fp;
 973         }
 974         return NULL;
 975 }
 976
 977 static void
 978 release_all_files(void)
 979 {
 980         int i;
 981         struct nfs4_file *fp;
 982
 983         for (i=0;i<FILE_HASH_SIZE;i++) {
 984                 while (!list_empty(&file_hashtbl[i])) {
 985                         fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
 986                         /* this should never be more than once... */
 987                         if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) {
 988                                 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
 989                         }
 990                         release_file(fp);
 991                 }
 992         }
 993 }
 994
 995 kmem_cache_t *stateowner_slab = NULL;
 996
 997 static int
 998 nfsd4_init_slabs(void)
 999 {
1000         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1001                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1002         if (stateowner_slab == NULL) {
1003                 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1004                 return -ENOMEM;
1005         }
1006         return 0;
1007 }
1008
1009 static void
1010 nfsd4_free_slabs(void)
1011 {
1012         int status = 0;
1013
1014         if (stateowner_slab)
1015                 status = kmem_cache_destroy(stateowner_slab);
1016         stateowner_slab = NULL;
1017         BUG_ON(status);
1018 }
1019
1020 void
1021 nfs4_free_stateowner(struct kref *kref)
1022 {
1023         struct nfs4_stateowner *sop =
1024                 container_of(kref, struct nfs4_stateowner, so_ref);
1025         kfree(sop->so_owner.data);
1026         kmem_cache_free(stateowner_slab, sop);
1027 }
1028
1029 static inline struct nfs4_stateowner *
1030 alloc_stateowner(struct xdr_netobj *owner)
1031 {
1032         struct nfs4_stateowner *sop;
1033
1034         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1035                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1036                         memcpy(sop->so_owner.data, owner->data, owner->len);
1037                         sop->so_owner.len = owner->len;
1038                         kref_init(&sop->so_ref);
1039                         return sop;
1040                 }
1041                 kmem_cache_free(stateowner_slab, sop);
1042         }
1043         return NULL;
1044 }
1045
1046 static struct nfs4_stateowner *
1047 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1048         struct nfs4_stateowner *sop;
1049         struct nfs4_replay *rp;
1050         unsigned int idhashval;
1051
1052         if (!(sop = alloc_stateowner(&open->op_owner)))
1053                 return NULL;
1054         idhashval = ownerid_hashval(current_ownerid);
1055         INIT_LIST_HEAD(&sop->so_idhash);
1056         INIT_LIST_HEAD(&sop->so_strhash);
1057         INIT_LIST_HEAD(&sop->so_perclient);
1058         INIT_LIST_HEAD(&sop->so_perfilestate);
1059         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
1060         INIT_LIST_HEAD(&sop->so_close_lru);
1061         sop->so_time = 0;
1062         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1063         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1064         list_add(&sop->so_perclient, &clp->cl_perclient);
1065         add_perclient++;
1066         sop->so_is_open_owner = 1;
1067         sop->so_id = current_ownerid++;
1068         sop->so_client = clp;
1069         sop->so_seqid = open->op_seqid;
1070         sop->so_confirmed = 0;
1071         rp = &sop->so_replay;
1072         rp->rp_status = NFSERR_SERVERFAULT;
1073         rp->rp_buflen = 0;
1074         rp->rp_buf = rp->rp_ibuf;
1075         return sop;
1076 }
1077
1078 static void
1079 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1080 {
1081         struct nfs4_stateowner *lock_sop;
1082
1083         while (!list_empty(&open_stp->st_perlockowner)) {
1084                 lock_sop = list_entry(open_stp->st_perlockowner.next,
1085                                 struct nfs4_stateowner, so_perlockowner);
1086                 /* list_del(&open_stp->st_perlockowner);  */
1087                 BUG_ON(lock_sop->so_is_open_owner);
1088                 release_stateowner(lock_sop);
1089         }
1090 }
1091
1092 static void
1093 unhash_stateowner(struct nfs4_stateowner *sop)
1094 {
1095         struct nfs4_stateid *stp;
1096
1097         list_del(&sop->so_idhash);
1098         list_del(&sop->so_strhash);
1099         if (sop->so_is_open_owner) {
1100                 list_del(&sop->so_perclient);
1101                 del_perclient++;
1102         }
1103         list_del(&sop->so_perlockowner);
1104         while (!list_empty(&sop->so_perfilestate)) {
1105                 stp = list_entry(sop->so_perfilestate.next,
1106                         struct nfs4_stateid, st_perfilestate);
1107                 if (sop->so_is_open_owner)
1108                         release_stateid(stp, OPEN_STATE);
1109                 else
1110                         release_stateid(stp, LOCK_STATE);
1111         }
1112 }
1113
1114 static void
1115 release_stateowner(struct nfs4_stateowner *sop)
1116 {
1117         unhash_stateowner(sop);
1118         list_del(&sop->so_close_lru);
1119         nfs4_put_stateowner(sop);
1120 }
1121
1122 static inline void
1123 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1124         struct nfs4_stateowner *sop = open->op_stateowner;
1125         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1126
1127         INIT_LIST_HEAD(&stp->st_hash);
1128         INIT_LIST_HEAD(&stp->st_perfilestate);
1129         INIT_LIST_HEAD(&stp->st_perlockowner);
1130         INIT_LIST_HEAD(&stp->st_perfile);
1131         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1132         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1133         list_add_perfile++;
1134         list_add(&stp->st_perfile, &fp->fi_perfile);
1135         stp->st_stateowner = sop;
1136         stp->st_file = fp;
1137         stp->st_stateid.si_boot = boot_time;
1138         stp->st_stateid.si_stateownerid = sop->so_id;
1139         stp->st_stateid.si_fileid = fp->fi_id;
1140         stp->st_stateid.si_generation = 0;
1141         stp->st_access_bmap = 0;
1142         stp->st_deny_bmap = 0;
1143         __set_bit(open->op_share_access, &stp->st_access_bmap);
1144         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1145 }
1146
1147 static void
1148 release_stateid(struct nfs4_stateid *stp, int flags)
1149 {
1150         struct file *filp = stp->st_vfs_file;
1151
1152         list_del(&stp->st_hash);
1153         list_del_perfile++;
1154         list_del(&stp->st_perfile);
1155         list_del(&stp->st_perfilestate);
1156         if (flags & OPEN_STATE) {
1157                 release_stateid_lockowners(stp);
1158                 stp->st_vfs_file = NULL;
1159                 nfsd_close(filp);
1160                 vfsclose++;
1161         } else if (flags & LOCK_STATE)
1162                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1163         kfree(stp);
1164         stp = NULL;
1165 }
1166
1167 static void
1168 release_file(struct nfs4_file *fp)
1169 {
1170         free_file++;
1171         list_del(&fp->fi_hash);
1172         iput(fp->fi_inode);
1173         kfree(fp);
1174 }
1175
1176 void
1177 move_to_close_lru(struct nfs4_stateowner *sop)
1178 {
1179         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1180
1181         unhash_stateowner(sop);
1182         list_add_tail(&sop->so_close_lru, &close_lru);
1183         sop->so_time = get_seconds();
1184 }
1185
1186 void
1187 release_state_owner(struct nfs4_stateid *stp, int flag)
1188 {
1189         struct nfs4_stateowner *sop = stp->st_stateowner;
1190         struct nfs4_file *fp = stp->st_file;
1191
1192         dprintk("NFSD: release_state_owner\n");
1193         release_stateid(stp, flag);
1194
1195         /* place unused nfs4_stateowners on so_close_lru list to be
1196          * released by the laundromat service after the lease period
1197          * to enable us to handle CLOSE replay
1198          */
1199         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1200                 move_to_close_lru(sop);
1201         /* unused nfs4_file's are releseed. XXX slab cache? */
1202         if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) {
1203                 release_file(fp);
1204         }
1205 }
1206
1207 static int
1208 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1209         return ((sop->so_owner.len == owner->len) &&
1210          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1211           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1212 }
1213
1214 static struct nfs4_stateowner *
1215 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1216 {
1217         struct nfs4_stateowner *so = NULL;
1218
1219         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1220                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1221                         return so;
1222         }
1223         return NULL;
1224 }
1225
1226 /* search file_hashtbl[] for file */
1227 static struct nfs4_file *
1228 find_file(struct inode *ino)
1229 {
1230         unsigned int hashval = file_hashval(ino);
1231         struct nfs4_file *fp;
1232
1233         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1234                 if (fp->fi_inode == ino)
1235                         return fp;
1236         }
1237         return NULL;
1238 }
1239
1240 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1241 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1242
1243 void
1244 set_access(unsigned int *access, unsigned long bmap) {
1245         int i;
1246
1247         *access = 0;
1248         for (i = 1; i < 4; i++) {
1249                 if (test_bit(i, &bmap))
1250                         *access |= i;
1251         }
1252 }
1253
1254 void
1255 set_deny(unsigned int *deny, unsigned long bmap) {
1256         int i;
1257
1258         *deny = 0;
1259         for (i = 0; i < 4; i++) {
1260                 if (test_bit(i, &bmap))
1261                         *deny |= i ;
1262         }
1263 }
1264
1265 static int
1266 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1267         unsigned int access, deny;
1268
1269         set_access(&access, stp->st_access_bmap);
1270         set_deny(&deny, stp->st_deny_bmap);
1271         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1272                 return 0;
1273         return 1;
1274 }
1275
1276 /*
1277  * Called to check deny when READ with all zero stateid or
1278  * WRITE with all zero or all one stateid
1279  */
1280 int
1281 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1282 {
1283         struct inode *ino = current_fh->fh_dentry->d_inode;
1284         struct nfs4_file *fp;
1285         struct nfs4_stateid *stp;
1286
1287         dprintk("NFSD: nfs4_share_conflict\n");
1288
1289         fp = find_file(ino);
1290         if (fp) {
1291         /* Search for conflicting share reservations */
1292                 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1293                         if (test_bit(deny_type, &stp->st_deny_bmap) ||
1294                             test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1295                                 return nfserr_share_denied;
1296                 }
1297         }
1298         return nfs_ok;
1299 }
1300
1301 static inline void
1302 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1303 {
1304         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1305                 put_write_access(filp->f_dentry->d_inode);
1306                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1307         }
1308 }
1309
1310 /*
1311  * Recall a delegation
1312  */
1313 static int
1314 do_recall(void *__dp)
1315 {
1316         struct nfs4_delegation *dp = __dp;
1317
1318         daemonize("nfsv4-recall");
1319
1320         nfsd4_cb_recall(dp);
1321         return 0;
1322 }
1323
1324 /*
1325  * Spawn a thread to perform a recall on the delegation represented
1326  * by the lease (file_lock)
1327  *
1328  * Called from break_lease() with lock_kernel() held.
1329  * Note: we assume break_lease will only call this *once* for any given
1330  * lease.
1331  */
1332 static
1333 void nfsd_break_deleg_cb(struct file_lock *fl)
1334 {
1335         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1336         struct task_struct *t;
1337
1338         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1339         if (!dp)
1340                 return;
1341
1342         /* We're assuming the state code never drops its reference
1343          * without first removing the lease.  Since we're in this lease
1344          * callback (and since the lease code is serialized by the kernel
1345          * lock) we know the server hasn't removed the lease yet, we know
1346          * it's safe to take a reference: */
1347         atomic_inc(&dp->dl_count);
1348
1349         spin_lock(&recall_lock);
1350         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1351         spin_unlock(&recall_lock);
1352
1353         /* only place dl_time is set. protected by lock_kernel*/
1354         dp->dl_time = get_seconds();
1355
1356         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1357         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1358
1359         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1360         if (IS_ERR(t)) {
1361                 struct nfs4_client *clp = dp->dl_client;
1362
1363                 printk(KERN_INFO "NFSD: Callback thread failed for "
1364                         "for client (clientid %08x/%08x)\n",
1365                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1366                 nfs4_put_delegation(dp);
1367         }
1368 }
1369
1370 /*
1371  * The file_lock is being reapd.
1372  *
1373  * Called by locks_free_lock() with lock_kernel() held.
1374  */
1375 static
1376 void nfsd_release_deleg_cb(struct file_lock *fl)
1377 {
1378         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1379
1380         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1381
1382         if (!(fl->fl_flags & FL_LEASE) || !dp)
1383                 return;
1384         dp->dl_flock = NULL;
1385 }
1386
1387 /*
1388  * Set the delegation file_lock back pointer.
1389  *
1390  * Called from __setlease() with lock_kernel() held.
1391  */
1392 static
1393 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1394 {
1395         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1396
1397         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1398         if (!dp)
1399                 return;
1400         dp->dl_flock = new;
1401 }
1402
1403 /*
1404  * Called from __setlease() with lock_kernel() held
1405  */
1406 static
1407 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1408 {
1409         struct nfs4_delegation *onlistd =
1410                 (struct nfs4_delegation *)onlist->fl_owner;
1411         struct nfs4_delegation *tryd =
1412                 (struct nfs4_delegation *)try->fl_owner;
1413
1414         if (onlist->fl_lmops != try->fl_lmops)
1415                 return 0;
1416
1417         return onlistd->dl_client == tryd->dl_client;
1418 }
1419
1420
1421 static
1422 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1423 {
1424         if (arg & F_UNLCK)
1425                 return lease_modify(onlist, arg);
1426         else
1427                 return -EAGAIN;
1428 }
1429
1430 struct lock_manager_operations nfsd_lease_mng_ops = {
1431         .fl_break = nfsd_break_deleg_cb,
1432         .fl_release_private = nfsd_release_deleg_cb,
1433         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1434         .fl_mylease = nfsd_same_client_deleg_cb,
1435         .fl_change = nfsd_change_deleg_cb,
1436 };
1437
1438
1439 /*
1440  * nfsd4_process_open1()
1441  *      lookup stateowner.
1442  *              found:
1443  *                      check confirmed
1444  *                              confirmed:
1445  *                                      check seqid
1446  *                              not confirmed:
1447  *                                      delete owner
1448  *                                      create new owner
1449  *              notfound:
1450  *                      verify clientid
1451  *                      create new owner
1452  *
1453  * called with nfs4_lock_state() held.
1454  */
1455 int
1456 nfsd4_process_open1(struct nfsd4_open *open)
1457 {
1458         int status;
1459         clientid_t *clientid = &open->op_clientid;
1460         struct nfs4_client *clp = NULL;
1461         unsigned int strhashval;
1462         struct nfs4_stateowner *sop = NULL;
1463
1464         status = nfserr_inval;
1465         if (!check_name(open->op_owner))
1466                 goto out;
1467
1468         if (STALE_CLIENTID(&open->op_clientid))
1469                 return nfserr_stale_clientid;
1470
1471         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1472         sop = find_openstateowner_str(strhashval, open);
1473         if (sop) {
1474                 open->op_stateowner = sop;
1475                 /* check for replay */
1476                 if (open->op_seqid == sop->so_seqid){
1477                         if (sop->so_replay.rp_buflen)
1478                                 return NFSERR_REPLAY_ME;
1479                         else {
1480                                 /* The original OPEN failed so spectacularly
1481                                  * that we don't even have replay data saved!
1482                                  * Therefore, we have no choice but to continue
1483                                  * processing this OPEN; presumably, we'll
1484                                  * fail again for the same reason.
1485                                  */
1486                                 dprintk("nfsd4_process_open1:"
1487                                         " replay with no replay cache\n");
1488                                 goto renew;
1489                         }
1490                 } else if (sop->so_confirmed) {
1491                         if (open->op_seqid == sop->so_seqid + 1)
1492                                 goto renew;
1493                         status = nfserr_bad_seqid;
1494                         goto out;
1495                 } else {
1496                         /* If we get here, we received an OPEN for an
1497                          * unconfirmed nfs4_stateowner. Since the seqid's are
1498                          * different, purge the existing nfs4_stateowner, and
1499                          * instantiate a new one.
1500                          */
1501                         clp = sop->so_client;
1502                         release_stateowner(sop);
1503                 }
1504         } else {
1505                 /* nfs4_stateowner not found.
1506                  * Verify clientid and instantiate new nfs4_stateowner.
1507                  * If verify fails this is presumably the result of the
1508                  * client's lease expiring.
1509                  */
1510                 status = nfserr_expired;
1511                 clp = find_confirmed_client(clientid);
1512                 if (clp == NULL)
1513                         goto out;
1514         }
1515         status = nfserr_resource;
1516         sop = alloc_init_open_stateowner(strhashval, clp, open);
1517         if (sop == NULL)
1518                 goto out;
1519         open->op_stateowner = sop;
1520 renew:
1521         status = nfs_ok;
1522         renew_client(sop->so_client);
1523 out:
1524         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1525                 status = nfserr_reclaim_bad;
1526         return status;
1527 }
1528
1529 static int
1530 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1531 {
1532         struct nfs4_stateid *local;
1533         int status = nfserr_share_denied;
1534         struct nfs4_stateowner *sop = open->op_stateowner;
1535
1536         list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
1537                 /* ignore lock owners */
1538                 if (local->st_stateowner->so_is_open_owner == 0)
1539                         continue;
1540                 /* remember if we have seen this open owner */
1541                 if (local->st_stateowner == sop)
1542                         *stpp = local;
1543                 /* check for conflicting share reservations */
1544                 if (!test_share(local, open))
1545                         goto out;
1546         }
1547         status = 0;
1548 out:
1549         return status;
1550 }
1551
1552 static int
1553 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1554                 struct svc_fh *cur_fh, int flags)
1555 {
1556         struct nfs4_stateid *stp;
1557         int status;
1558
1559         stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
1560         if (stp == NULL)
1561                 return nfserr_resource;
1562
1563         status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, &stp->st_vfs_file);
1564         if (status) {
1565                 if (status == nfserr_dropit)
1566                         status = nfserr_jukebox;
1567                 kfree(stp);
1568                 return status;
1569         }
1570         vfsopen++;
1571         *stpp = stp;
1572         return 0;
1573 }
1574
1575 static inline int
1576 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1577                 struct nfsd4_open *open)
1578 {
1579         struct iattr iattr = {
1580                 .ia_valid = ATTR_SIZE,
1581                 .ia_size = 0,
1582         };
1583         if (!open->op_truncate)
1584                 return 0;
1585         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1586                 return -EINVAL;
1587         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1588 }
1589
1590 static int
1591 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1592 {
1593         struct file *filp = stp->st_vfs_file;
1594         struct inode *inode = filp->f_dentry->d_inode;
1595         unsigned int share_access;
1596         int status;
1597
1598         set_access(&share_access, stp->st_access_bmap);
1599         share_access = ~share_access;
1600         share_access &= open->op_share_access;
1601
1602         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1603                 return nfsd4_truncate(rqstp, cur_fh, open);
1604
1605         status = get_write_access(inode);
1606         if (status)
1607                 return nfserrno(status);
1608         status = nfsd4_truncate(rqstp, cur_fh, open);
1609         if (status) {
1610                 put_write_access(inode);
1611                 return status;
1612         }
1613         /* remember the open */
1614         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1615         set_bit(open->op_share_access, &stp->st_access_bmap);
1616         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1617
1618         return nfs_ok;
1619 }
1620
1621
1622 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1623 static void
1624 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1625 {
1626         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1627                 if (*status)
1628                         *status = nfserr_reclaim_bad;
1629                 else {
1630                         open->op_stateowner->so_confirmed = 1;
1631                         open->op_stateowner->so_seqid--;
1632                 }
1633         }
1634 }
1635
1636 /*
1637  * Attempt to hand out a delegation.
1638  */
1639 static void
1640 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1641 {
1642         struct nfs4_delegation *dp;
1643         struct nfs4_stateowner *sop = stp->st_stateowner;
1644         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1645         struct file_lock fl, *flp = &fl;
1646         int status, flag = 0;
1647
1648         flag = NFS4_OPEN_DELEGATE_NONE;
1649         if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
1650              || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
1651                 goto out;
1652
1653         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1654                 flag = NFS4_OPEN_DELEGATE_WRITE;
1655         else
1656                 flag = NFS4_OPEN_DELEGATE_READ;
1657
1658         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1659         if (dp == NULL) {
1660                 flag = NFS4_OPEN_DELEGATE_NONE;
1661                 goto out;
1662         }
1663         locks_init_lock(&fl);
1664         fl.fl_lmops = &nfsd_lease_mng_ops;
1665         fl.fl_flags = FL_LEASE;
1666         fl.fl_end = OFFSET_MAX;
1667         fl.fl_owner =  (fl_owner_t)dp;
1668         fl.fl_file = stp->st_vfs_file;
1669         fl.fl_pid = current->tgid;
1670
1671         /* setlease checks to see if delegation should be handed out.
1672          * the lock_manager callbacks fl_mylease and fl_change are used
1673          */
1674         if ((status = setlease(stp->st_vfs_file,
1675                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1676                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1677                 unhash_delegation(dp);
1678                 flag = NFS4_OPEN_DELEGATE_NONE;
1679                 goto out;
1680         }
1681
1682         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1683
1684         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1685                      dp->dl_stateid.si_boot,
1686                      dp->dl_stateid.si_stateownerid,
1687                      dp->dl_stateid.si_fileid,
1688                      dp->dl_stateid.si_generation);
1689 out:
1690         open->op_delegate_type = flag;
1691 }
1692
1693 /*
1694  * called with nfs4_lock_state() held.
1695  */
1696 int
1697 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1698 {
1699         struct nfs4_file *fp = NULL;
1700         struct inode *ino = current_fh->fh_dentry->d_inode;
1701         struct nfs4_stateid *stp = NULL;
1702         int status;
1703
1704         status = nfserr_inval;
1705         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1706                 goto out;
1707         /*
1708          * Lookup file; if found, lookup stateid and check open request,
1709          * and check for delegations in the process of being recalled.
1710          * If not found, create the nfs4_file struct
1711          */
1712         fp = find_file(ino);
1713         if (fp) {
1714                 if ((status = nfs4_check_open(fp, open, &stp)))
1715                         goto out;
1716         } else {
1717                 status = nfserr_resource;
1718                 fp = alloc_init_file(ino);
1719                 if (fp == NULL)
1720                         goto out;
1721         }
1722
1723         /*
1724          * OPEN the file, or upgrade an existing OPEN.
1725          * If truncate fails, the OPEN fails.
1726          */
1727         if (stp) {
1728                 /* Stateid was found, this is an OPEN upgrade */
1729                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1730                 if (status)
1731                         goto out;
1732         } else {
1733                 /* Stateid was not found, this is a new OPEN */
1734                 int flags = 0;
1735                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1736                         flags = MAY_WRITE;
1737                 else
1738                         flags = MAY_READ;
1739                 if ((status = nfs4_new_open(rqstp, &stp, current_fh, flags)))
1740                         goto out;
1741                 init_stateid(stp, fp, open);
1742                 status = nfsd4_truncate(rqstp, current_fh, open);
1743                 if (status) {
1744                         release_stateid(stp, OPEN_STATE);
1745                         goto out;
1746                 }
1747         }
1748         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1749
1750         /*
1751         * Attempt to hand out a delegation. No error return, because the
1752         * OPEN succeeds even if we fail.
1753         */
1754         nfs4_open_delegation(current_fh, open, stp);
1755
1756         status = nfs_ok;
1757
1758         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1759                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1760                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1761 out:
1762         /* take the opportunity to clean up unused state */
1763         if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
1764                 release_file(fp);
1765
1766         /* CLAIM_PREVIOUS has different error returns */
1767         nfs4_set_claim_prev(open, &status);
1768         /*
1769         * To finish the open response, we just need to set the rflags.
1770         */
1771         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1772         if (!open->op_stateowner->so_confirmed)
1773                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1774
1775         return status;
1776 }
1777
1778 static struct work_struct laundromat_work;
1779 static void laundromat_main(void *);
1780 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1781
1782 int
1783 nfsd4_renew(clientid_t *clid)
1784 {
1785         struct nfs4_client *clp;
1786         int status;
1787
1788         nfs4_lock_state();
1789         dprintk("process_renew(%08x/%08x): starting\n",
1790                         clid->cl_boot, clid->cl_id);
1791         status = nfserr_stale_clientid;
1792         if (STALE_CLIENTID(clid))
1793                 goto out;
1794         clp = find_confirmed_client(clid);
1795         status = nfserr_expired;
1796         if (clp == NULL) {
1797                 /* We assume the client took too long to RENEW. */
1798                 dprintk("nfsd4_renew: clientid not found!\n");
1799                 goto out;
1800         }
1801         renew_client(clp);
1802         status = nfserr_cb_path_down;
1803         if (!list_empty(&clp->cl_del_perclnt)
1804                         && !atomic_read(&clp->cl_callback.cb_set))
1805                 goto out;
1806         status = nfs_ok;
1807 out:
1808         nfs4_unlock_state();
1809         return status;
1810 }
1811
1812 time_t
1813 nfs4_laundromat(void)
1814 {
1815         struct nfs4_client *clp;
1816         struct nfs4_stateowner *sop;
1817         struct nfs4_delegation *dp;
1818         struct list_head *pos, *next, reaplist;
1819         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1820         time_t t, clientid_val = NFSD_LEASE_TIME;
1821         time_t u, test_val = NFSD_LEASE_TIME;
1822
1823         nfs4_lock_state();
1824
1825         dprintk("NFSD: laundromat service - starting\n");
1826         list_for_each_safe(pos, next, &client_lru) {
1827                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1828                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1829                         t = clp->cl_time - cutoff;
1830                         if (clientid_val > t)
1831                                 clientid_val = t;
1832                         break;
1833                 }
1834                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1835                         clp->cl_clientid.cl_id);
1836                 expire_client(clp);
1837         }
1838         INIT_LIST_HEAD(&reaplist);
1839         spin_lock(&recall_lock);
1840         list_for_each_safe(pos, next, &del_recall_lru) {
1841                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1842                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1843                         u = dp->dl_time - cutoff;
1844                         if (test_val > u)
1845                                 test_val = u;
1846                         break;
1847                 }
1848                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1849                                     dp, dp->dl_flock);
1850                 list_move(&dp->dl_recall_lru, &reaplist);
1851         }
1852         spin_unlock(&recall_lock);
1853         list_for_each_safe(pos, next, &reaplist) {
1854                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1855                 list_del_init(&dp->dl_recall_lru);
1856                 unhash_delegation(dp);
1857         }
1858         test_val = NFSD_LEASE_TIME;
1859         list_for_each_safe(pos, next, &close_lru) {
1860                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1861                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1862                         u = sop->so_time - cutoff;
1863                         if (test_val > u)
1864                                 test_val = u;
1865                         break;
1866                 }
1867                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1868                         sop->so_id);
1869                 list_del(&sop->so_close_lru);
1870                 nfs4_put_stateowner(sop);
1871         }
1872         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1873                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1874         nfs4_unlock_state();
1875         return clientid_val;
1876 }
1877
1878 void
1879 laundromat_main(void *not_used)
1880 {
1881         time_t t;
1882
1883         t = nfs4_laundromat();
1884         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1885         schedule_delayed_work(&laundromat_work, t*HZ);
1886 }
1887
1888 /* search ownerid_hashtbl[] and close_lru for stateid owner
1889  * (stateid->si_stateownerid)
1890  */
1891 struct nfs4_stateowner *
1892 find_openstateowner_id(u32 st_id, int flags) {
1893         struct nfs4_stateowner *local = NULL;
1894
1895         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1896         if (flags & CLOSE_STATE) {
1897                 list_for_each_entry(local, &close_lru, so_close_lru) {
1898                         if (local->so_id == st_id)
1899                                 return local;
1900                 }
1901         }
1902         return NULL;
1903 }
1904
1905 static inline int
1906 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1907 {
1908         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1909 }
1910
1911 static int
1912 STALE_STATEID(stateid_t *stateid)
1913 {
1914         if (stateid->si_boot == boot_time)
1915                 return 0;
1916         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1917                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1918                 stateid->si_generation);
1919         return 1;
1920 }
1921
1922 static inline int
1923 access_permit_read(unsigned long access_bmap)
1924 {
1925         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1926                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1927                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1928 }
1929
1930 static inline int
1931 access_permit_write(unsigned long access_bmap)
1932 {
1933         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1934                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1935 }
1936
1937 static
1938 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1939 {
1940         int status = nfserr_openmode;
1941
1942         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1943                 goto out;
1944         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1945                 goto out;
1946         status = nfs_ok;
1947 out:
1948         return status;
1949 }
1950
1951 static inline int
1952 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1953 {
1954         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1955                 return nfserr_openmode;
1956         else
1957                 return nfs_ok;
1958 }
1959
1960 static inline int
1961 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1962 {
1963         /* Trying to call delegreturn with a special stateid? Yuch: */
1964         if (!(flags & (RD_STATE | WR_STATE)))
1965                 return nfserr_bad_stateid;
1966         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1967                 return nfs_ok;
1968         else if (nfs4_in_grace()) {
1969                 /* Answer in remaining cases depends on existance of
1970                  * conflicting state; so we must wait out the grace period. */
1971                 return nfserr_grace;
1972         } else if (flags & WR_STATE)
1973                 return nfs4_share_conflict(current_fh,
1974                                 NFS4_SHARE_DENY_WRITE);
1975         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1976                 return nfs4_share_conflict(current_fh,
1977                                 NFS4_SHARE_DENY_READ);
1978 }
1979
1980 /*
1981  * Allow READ/WRITE during grace period on recovered state only for files
1982  * that are not able to provide mandatory locking.
1983  */
1984 static inline int
1985 io_during_grace_disallowed(struct inode *inode, int flags)
1986 {
1987         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
1988                 && MANDATORY_LOCK(inode);
1989 }
1990
1991 /*
1992 * Checks for stateid operations
1993 */
1994 int
1995 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1996 {
1997         struct nfs4_stateid *stp = NULL;
1998         struct nfs4_delegation *dp = NULL;
1999         stateid_t *stidp;
2000         struct inode *ino = current_fh->fh_dentry->d_inode;
2001         int status;
2002
2003         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2004                 stateid->si_boot, stateid->si_stateownerid,
2005                 stateid->si_fileid, stateid->si_generation);
2006         if (filpp)
2007                 *filpp = NULL;
2008
2009         if (io_during_grace_disallowed(ino, flags))
2010                 return nfserr_grace;
2011
2012         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2013                 return check_special_stateids(current_fh, stateid, flags);
2014
2015         /* STALE STATEID */
2016         status = nfserr_stale_stateid;
2017         if (STALE_STATEID(stateid))
2018                 goto out;
2019
2020         /* BAD STATEID */
2021         status = nfserr_bad_stateid;
2022         if (!stateid->si_fileid) { /* delegation stateid */
2023                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2024                         dprintk("NFSD: delegation stateid not found\n");
2025                         if (nfs4_in_grace())
2026                                 status = nfserr_grace;
2027                         goto out;
2028                 }
2029                 stidp = &dp->dl_stateid;
2030         } else { /* open or lock stateid */
2031                 if (!(stp = find_stateid(stateid, flags))) {
2032                         dprintk("NFSD: open or lock stateid not found\n");
2033                         if (nfs4_in_grace())
2034                                 status = nfserr_grace;
2035                         goto out;
2036                 }
2037                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2038                         goto out;
2039                 if (!stp->st_stateowner->so_confirmed)
2040                         goto out;
2041                 stidp = &stp->st_stateid;
2042         }
2043         if (stateid->si_generation > stidp->si_generation)
2044                 goto out;
2045
2046         /* OLD STATEID */
2047         status = nfserr_old_stateid;
2048         if (stateid->si_generation < stidp->si_generation)
2049                 goto out;
2050         if (stp) {
2051                 if ((status = nfs4_check_openmode(stp,flags)))
2052                         goto out;
2053                 renew_client(stp->st_stateowner->so_client);
2054                 if (filpp)
2055                         *filpp = stp->st_vfs_file;
2056         } else if (dp) {
2057                 if ((status = nfs4_check_delegmode(dp, flags)))
2058                         goto out;
2059                 renew_client(dp->dl_client);
2060                 if (flags & DELEG_RET)
2061                         unhash_delegation(dp);
2062                 if (filpp)
2063                         *filpp = dp->dl_vfs_file;
2064         }
2065         status = nfs_ok;
2066 out:
2067         return status;
2068 }
2069
2070
2071 /*
2072  * Checks for sequence id mutating operations.
2073  */
2074 int
2075 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)
2076 {
2077         int status;
2078         struct nfs4_stateid *stp;
2079         struct nfs4_stateowner *sop;
2080
2081         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2082                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2083                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2084                 stateid->si_generation);
2085
2086         *stpp = NULL;
2087         *sopp = NULL;
2088
2089         status = nfserr_bad_stateid;
2090         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2091                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2092                 goto out;
2093         }
2094
2095         status = nfserr_stale_stateid;
2096         if (STALE_STATEID(stateid))
2097                 goto out;
2098         /*
2099         * We return BAD_STATEID if filehandle doesn't match stateid,
2100         * the confirmed flag is incorrecly set, or the generation
2101         * number is incorrect.
2102         * If there is no entry in the openfile table for this id,
2103         * we can't always return BAD_STATEID;
2104         * this might be a retransmitted CLOSE which has arrived after
2105         * the openfile has been released.
2106         */
2107         if (!(stp = find_stateid(stateid, flags)))
2108                 goto no_nfs4_stateid;
2109
2110         status = nfserr_bad_stateid;
2111
2112         /* for new lock stateowners:
2113          * check that the lock->v.new.open_stateid
2114          * refers to an open stateowner
2115          *
2116          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2117          * as the open_stateid->st_stateowner->so_client->clientid
2118          */
2119         if (lockclid) {
2120                 struct nfs4_stateowner *sop = stp->st_stateowner;
2121                 struct nfs4_client *clp = sop->so_client;
2122
2123                 if (!sop->so_is_open_owner)
2124                         goto out;
2125                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2126                         goto out;
2127         }
2128
2129         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2130                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2131                 goto out;
2132         }
2133
2134         *stpp = stp;
2135         *sopp = sop = stp->st_stateowner;
2136
2137         /*
2138         *  We now validate the seqid and stateid generation numbers.
2139         *  For the moment, we ignore the possibility of
2140         *  generation number wraparound.
2141         */
2142         if (seqid != sop->so_seqid + 1)
2143                 goto check_replay;
2144
2145         if (sop->so_confirmed) {
2146                 if (flags & CONFIRM) {
2147                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2148                         goto out;
2149                 }
2150         }
2151         else {
2152                 if (!(flags & CONFIRM)) {
2153                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2154                         goto out;
2155                 }
2156         }
2157         if (stateid->si_generation > stp->st_stateid.si_generation) {
2158                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2159                 goto out;
2160         }
2161
2162         status = nfserr_old_stateid;
2163         if (stateid->si_generation < stp->st_stateid.si_generation) {
2164                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2165                 goto out;
2166         }
2167         /* XXX renew the client lease here */
2168         status = nfs_ok;
2169
2170 out:
2171         return status;
2172
2173 no_nfs4_stateid:
2174
2175         /*
2176         * We determine whether this is a bad stateid or a replay,
2177         * starting by trying to look up the stateowner.
2178         * If stateowner is not found - stateid is bad.
2179         */
2180         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2181                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2182                 status = nfserr_bad_stateid;
2183                 goto out;
2184         }
2185         *sopp = sop;
2186
2187 check_replay:
2188         if (seqid == sop->so_seqid) {
2189                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2190                 /* indicate replay to calling function */
2191                 status = NFSERR_REPLAY_ME;
2192         } else  {
2193                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2194
2195                 *sopp = NULL;
2196                 status = nfserr_bad_seqid;
2197         }
2198         goto out;
2199 }
2200
2201 int
2202 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2203 {
2204         int status;
2205         struct nfs4_stateowner *sop;
2206         struct nfs4_stateid *stp;
2207
2208         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2209                         (int)current_fh->fh_dentry->d_name.len,
2210                         current_fh->fh_dentry->d_name.name);
2211
2212         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2213                 goto out;
2214
2215         nfs4_lock_state();
2216
2217         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2218                                         &oc->oc_req_stateid,
2219                                         CHECK_FH | CONFIRM | OPEN_STATE,
2220                                         &oc->oc_stateowner, &stp, NULL)))
2221                 goto out;
2222
2223         sop = oc->oc_stateowner;
2224         sop->so_confirmed = 1;
2225         update_stateid(&stp->st_stateid);
2226         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2227         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2228                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2229                          stp->st_stateid.si_boot,
2230                          stp->st_stateid.si_stateownerid,
2231                          stp->st_stateid.si_fileid,
2232                          stp->st_stateid.si_generation);
2233 out:
2234         if (oc->oc_stateowner)
2235                 nfs4_get_stateowner(oc->oc_stateowner);
2236         nfs4_unlock_state();
2237         return status;
2238 }
2239
2240
2241 /*
2242  * unset all bits in union bitmap (bmap) that
2243  * do not exist in share (from successful OPEN_DOWNGRADE)
2244  */
2245 static void
2246 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2247 {
2248         int i;
2249         for (i = 1; i < 4; i++) {
2250                 if ((i & access) != i)
2251                         __clear_bit(i, bmap);
2252         }
2253 }
2254
2255 static void
2256 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2257 {
2258         int i;
2259         for (i = 0; i < 4; i++) {
2260                 if ((i & deny) != i)
2261                         __clear_bit(i, bmap);
2262         }
2263 }
2264
2265 int
2266 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2267 {
2268         int status;
2269         struct nfs4_stateid *stp;
2270         unsigned int share_access;
2271
2272         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2273                         (int)current_fh->fh_dentry->d_name.len,
2274                         current_fh->fh_dentry->d_name.name);
2275
2276         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2277                 return nfserr_inval;
2278
2279         nfs4_lock_state();
2280         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2281                                         &od->od_stateid,
2282                                         CHECK_FH | OPEN_STATE,
2283                                         &od->od_stateowner, &stp, NULL)))
2284                 goto out;
2285
2286         status = nfserr_inval;
2287         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2288                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2289                         stp->st_access_bmap, od->od_share_access);
2290                 goto out;
2291         }
2292         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2293                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2294                         stp->st_deny_bmap, od->od_share_deny);
2295                 goto out;
2296         }
2297         set_access(&share_access, stp->st_access_bmap);
2298         nfs4_file_downgrade(stp->st_vfs_file,
2299                             share_access & ~od->od_share_access);
2300
2301         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2302         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2303
2304         update_stateid(&stp->st_stateid);
2305         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2306         status = nfs_ok;
2307 out:
2308         if (od->od_stateowner)
2309                 nfs4_get_stateowner(od->od_stateowner);
2310         nfs4_unlock_state();
2311         return status;
2312 }
2313
2314 /*
2315  * nfs4_unlock_state() called after encode
2316  */
2317 int
2318 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2319 {
2320         int status;
2321         struct nfs4_stateid *stp;
2322
2323         dprintk("NFSD: nfsd4_close on file %.*s\n",
2324                         (int)current_fh->fh_dentry->d_name.len,
2325                         current_fh->fh_dentry->d_name.name);
2326
2327         nfs4_lock_state();
2328         /* check close_lru for replay */
2329         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2330                                         &close->cl_stateid,
2331                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2332                                         &close->cl_stateowner, &stp, NULL)))
2333                 goto out;
2334         /*
2335         *  Return success, but first update the stateid.
2336         */
2337         status = nfs_ok;
2338         update_stateid(&stp->st_stateid);
2339         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2340
2341         /* release_state_owner() calls nfsd_close() if needed */
2342         release_state_owner(stp, OPEN_STATE);
2343 out:
2344         if (close->cl_stateowner)
2345                 nfs4_get_stateowner(close->cl_stateowner);
2346         nfs4_unlock_state();
2347         return status;
2348 }
2349
2350 int
2351 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2352 {
2353         int status;
2354
2355         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2356                 goto out;
2357
2358         nfs4_lock_state();
2359         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2360         nfs4_unlock_state();
2361 out:
2362         return status;
2363 }
2364
2365
2366 /*
2367  * Lock owner state (byte-range locks)
2368  */
2369 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2370 #define LOCK_HASH_BITS              8
2371 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2372 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2373
2374 #define lockownerid_hashval(id) \
2375         ((id) & LOCK_HASH_MASK)
2376
2377 static inline unsigned int
2378 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2379                 struct xdr_netobj *ownername)
2380 {
2381         return (file_hashval(inode) + cl_id
2382                         + opaque_hashval(ownername->data, ownername->len))
2383                 & LOCK_HASH_MASK;
2384 }
2385
2386 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2387 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2388 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2389
2390 struct nfs4_stateid *
2391 find_stateid(stateid_t *stid, int flags)
2392 {
2393         struct nfs4_stateid *local = NULL;
2394         u32 st_id = stid->si_stateownerid;
2395         u32 f_id = stid->si_fileid;
2396         unsigned int hashval;
2397
2398         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2399         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2400                 hashval = stateid_hashval(st_id, f_id);
2401                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2402                         if ((local->st_stateid.si_stateownerid == st_id) &&
2403                             (local->st_stateid.si_fileid == f_id))
2404                                 return local;
2405                 }
2406         }
2407         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2408                 hashval = stateid_hashval(st_id, f_id);
2409                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2410                         if ((local->st_stateid.si_stateownerid == st_id) &&
2411                             (local->st_stateid.si_fileid == f_id))
2412                                 return local;
2413                 }
2414         } else
2415                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2416         return NULL;
2417 }
2418
2419 static struct nfs4_delegation *
2420 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2421 {
2422         struct nfs4_delegation *dp = NULL;
2423         struct nfs4_file *fp = NULL;
2424         u32 st_id;
2425
2426         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2427                     stid->si_boot, stid->si_stateownerid,
2428                     stid->si_fileid, stid->si_generation);
2429
2430         st_id = stid->si_stateownerid;
2431         fp = find_file(ino);
2432         if (fp) {
2433                 list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
2434                         if(dp->dl_stateid.si_stateownerid == st_id) {
2435                                 dprintk("NFSD: find_delegation dp %p\n",dp);
2436                                 return dp;
2437                         }
2438                 }
2439         }
2440         return NULL;
2441 }
2442
2443 /*
2444  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2445  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2446  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2447  * locking, this prevents us from being completely protocol-compliant.  The
2448  * real solution to this problem is to start using unsigned file offsets in
2449  * the VFS, but this is a very deep change!
2450  */
2451 static inline void
2452 nfs4_transform_lock_offset(struct file_lock *lock)
2453 {
2454         if (lock->fl_start < 0)
2455                 lock->fl_start = OFFSET_MAX;
2456         if (lock->fl_end < 0)
2457                 lock->fl_end = OFFSET_MAX;
2458 }
2459
2460 int
2461 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2462 {
2463         struct nfs4_stateowner *local = NULL;
2464         int status = 0;
2465
2466         if (hashval >= LOCK_HASH_SIZE)
2467                 goto out;
2468         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2469                 if (local == sop) {
2470                         status = 1;
2471                         goto out;
2472                 }
2473         }
2474 out:
2475         return status;
2476 }
2477
2478
2479 static inline void
2480 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2481 {
2482         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2483         unsigned int hval = lockownerid_hashval(sop->so_id);
2484
2485         deny->ld_sop = NULL;
2486         if (nfs4_verify_lock_stateowner(sop, hval)) {
2487                 kref_get(&sop->so_ref);
2488                 deny->ld_sop = sop;
2489                 deny->ld_clientid = sop->so_client->cl_clientid;
2490         }
2491         deny->ld_start = fl->fl_start;
2492         deny->ld_length = ~(u64)0;
2493         if (fl->fl_end != ~(u64)0)
2494                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2495         deny->ld_type = NFS4_READ_LT;
2496         if (fl->fl_type != F_RDLCK)
2497                 deny->ld_type = NFS4_WRITE_LT;
2498 }
2499
2500 static struct nfs4_stateowner *
2501 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2502 {
2503         struct nfs4_stateowner *local = NULL;
2504         int i;
2505
2506         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2507                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2508                         if (!cmp_owner_str(local, owner, clid))
2509                                 continue;
2510                         return local;
2511                 }
2512         }
2513         return NULL;
2514 }
2515
2516 static struct nfs4_stateowner *
2517 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2518                 struct xdr_netobj *owner)
2519 {
2520         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2521         struct nfs4_stateowner *op;
2522
2523         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2524                 if (cmp_owner_str(op, owner, clid))
2525                         return op;
2526         }
2527         return NULL;
2528 }
2529
2530 /*
2531  * Alloc a lock owner structure.
2532  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2533  * occured.
2534  *
2535  * strhashval = lock_ownerstr_hashval
2536  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2537  */
2538
2539 static struct nfs4_stateowner *
2540 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2541         struct nfs4_stateowner *sop;
2542         struct nfs4_replay *rp;
2543         unsigned int idhashval;
2544
2545         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2546                 return NULL;
2547         idhashval = lockownerid_hashval(current_ownerid);
2548         INIT_LIST_HEAD(&sop->so_idhash);
2549         INIT_LIST_HEAD(&sop->so_strhash);
2550         INIT_LIST_HEAD(&sop->so_perclient);
2551         INIT_LIST_HEAD(&sop->so_perfilestate);
2552         INIT_LIST_HEAD(&sop->so_perlockowner);
2553         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2554         sop->so_time = 0;
2555         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2556         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2557         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2558         sop->so_is_open_owner = 0;
2559         sop->so_id = current_ownerid++;
2560         sop->so_client = clp;
2561         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2562         sop->so_confirmed = 1;
2563         rp = &sop->so_replay;
2564         rp->rp_status = NFSERR_SERVERFAULT;
2565         rp->rp_buflen = 0;
2566         rp->rp_buf = rp->rp_ibuf;
2567         return sop;
2568 }
2569
2570 struct nfs4_stateid *
2571 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2572 {
2573         struct nfs4_stateid *stp;
2574         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2575
2576         if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2577                                         GFP_KERNEL)) == NULL)
2578                 goto out;
2579         INIT_LIST_HEAD(&stp->st_hash);
2580         INIT_LIST_HEAD(&stp->st_perfile);
2581         INIT_LIST_HEAD(&stp->st_perfilestate);
2582         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2583         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2584         list_add(&stp->st_perfile, &fp->fi_perfile);
2585         list_add_perfile++;
2586         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2587         stp->st_stateowner = sop;
2588         stp->st_file = fp;
2589         stp->st_stateid.si_boot = boot_time;
2590         stp->st_stateid.si_stateownerid = sop->so_id;
2591         stp->st_stateid.si_fileid = fp->fi_id;
2592         stp->st_stateid.si_generation = 0;
2593         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2594         stp->st_access_bmap = open_stp->st_access_bmap;
2595         stp->st_deny_bmap = open_stp->st_deny_bmap;
2596
2597 out:
2598         return stp;
2599 }
2600
2601 int
2602 check_lock_length(u64 offset, u64 length)
2603 {
2604         return ((length == 0)  || ((length != ~(u64)0) &&
2605              LOFF_OVERFLOW(offset, length)));
2606 }
2607
2608 /*
2609  *  LOCK operation
2610  */
2611 int
2612 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2613 {
2614         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2615         struct nfs4_stateid *lock_stp;
2616         struct file *filp;
2617         struct file_lock file_lock;
2618         struct file_lock *conflock;
2619         int status = 0;
2620         unsigned int strhashval;
2621
2622         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2623                 (long long) lock->lk_offset,
2624                 (long long) lock->lk_length);
2625
2626         if (nfs4_in_grace() && !lock->lk_reclaim)
2627                 return nfserr_grace;
2628         if (!nfs4_in_grace() && lock->lk_reclaim)
2629                 return nfserr_no_grace;
2630
2631         if (check_lock_length(lock->lk_offset, lock->lk_length))
2632                  return nfserr_inval;
2633
2634         nfs4_lock_state();
2635
2636         if (lock->lk_is_new) {
2637         /*
2638          * Client indicates that this is a new lockowner.
2639          * Use open owner and open stateid to create lock owner and lock
2640          * stateid.
2641          */
2642                 struct nfs4_stateid *open_stp = NULL;
2643                 struct nfs4_file *fp;
2644
2645                 status = nfserr_stale_clientid;
2646                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2647                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2648                         goto out;
2649                 }
2650
2651                 /* is the new lock seqid presented by the client zero? */
2652                 status = nfserr_bad_seqid;
2653                 if (lock->v.new.lock_seqid != 0)
2654                         goto out;
2655
2656                 /* validate and update open stateid and open seqid */
2657                 status = nfs4_preprocess_seqid_op(current_fh,
2658                                         lock->lk_new_open_seqid,
2659                                         &lock->lk_new_open_stateid,
2660                                         CHECK_FH | OPEN_STATE,
2661                                         &open_sop, &open_stp,
2662                                         &lock->v.new.clientid);
2663                 if (status) {
2664                         if (lock->lk_reclaim)
2665                                 status = nfserr_reclaim_bad;
2666                         goto out;
2667                 }
2668                 /* create lockowner and lock stateid */
2669                 fp = open_stp->st_file;
2670                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2671                                 open_sop->so_client->cl_clientid.cl_id,
2672                                 &lock->v.new.owner);
2673                 /*
2674                  * If we already have this lock owner, the client is in
2675                  * error (or our bookeeping is wrong!)
2676                  * for asking for a 'new lock'.
2677                  */
2678                 status = nfserr_bad_stateid;
2679                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2680                                                 &lock->v.new.clientid);
2681                 if (lock_sop)
2682                         goto out;
2683                 status = nfserr_resource;
2684                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2685                         goto out;
2686                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2687                                                 fp, open_stp)) == NULL) {
2688                         release_stateowner(lock->lk_stateowner);
2689                         lock->lk_stateowner = NULL;
2690                         goto out;
2691                 }
2692                 /* bump the open seqid used to create the lock */
2693                 open_sop->so_seqid++;
2694         } else {
2695                 /* lock (lock owner + lock stateid) already exists */
2696                 status = nfs4_preprocess_seqid_op(current_fh,
2697                                        lock->lk_old_lock_seqid,
2698                                        &lock->lk_old_lock_stateid,
2699                                        CHECK_FH | LOCK_STATE,
2700                                        &lock->lk_stateowner, &lock_stp, NULL);
2701                 if (status)
2702                         goto out;
2703         }
2704         /* lock->lk_stateowner and lock_stp have been created or found */
2705         filp = lock_stp->st_vfs_file;
2706
2707         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2708                 printk("NFSD: nfsd4_lock: permission denied!\n");
2709                 goto out;
2710         }
2711
2712         locks_init_lock(&file_lock);
2713         switch (lock->lk_type) {
2714                 case NFS4_READ_LT:
2715                 case NFS4_READW_LT:
2716                         file_lock.fl_type = F_RDLCK;
2717                 break;
2718                 case NFS4_WRITE_LT:
2719                 case NFS4_WRITEW_LT:
2720                         file_lock.fl_type = F_WRLCK;
2721                 break;
2722                 default:
2723                         status = nfserr_inval;
2724                 goto out;
2725         }
2726         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2727         file_lock.fl_pid = current->tgid;
2728         file_lock.fl_file = filp;
2729         file_lock.fl_flags = FL_POSIX;
2730
2731         file_lock.fl_start = lock->lk_offset;
2732         if ((lock->lk_length == ~(u64)0) ||
2733                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2734                 file_lock.fl_end = ~(u64)0;
2735         else
2736                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2737         nfs4_transform_lock_offset(&file_lock);
2738
2739         /*
2740         * Try to lock the file in the VFS.
2741         * Note: locks.c uses the BKL to protect the inode's lock list.
2742         */
2743
2744         status = posix_lock_file(filp, &file_lock);
2745         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2746                 file_lock.fl_ops->fl_release_private(&file_lock);
2747         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2748         switch (-status) {
2749         case 0: /* success! */
2750                 update_stateid(&lock_stp->st_stateid);
2751                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2752                                 sizeof(stateid_t));
2753                 goto out;
2754         case (EAGAIN):
2755                 goto conflicting_lock;
2756         case (EDEADLK):
2757                 status = nfserr_deadlock;
2758         default:
2759                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2760                 goto out_destroy_new_stateid;
2761         }
2762
2763 conflicting_lock:
2764         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2765         status = nfserr_denied;
2766         /* XXX There is a race here. Future patch needed to provide
2767          * an atomic posix_lock_and_test_file
2768          */
2769         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2770                 status = nfserr_serverfault;
2771                 goto out;
2772         }
2773         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2774
2775 out_destroy_new_stateid:
2776         if (lock->lk_is_new) {
2777                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2778         /*
2779         * An error encountered after instantiation of the new
2780         * stateid has forced us to destroy it.
2781         */
2782                 if (!seqid_mutating_err(status))
2783                         open_sop->so_seqid--;
2784
2785                 release_state_owner(lock_stp, LOCK_STATE);
2786         }
2787 out:
2788         if (lock->lk_stateowner)
2789                 nfs4_get_stateowner(lock->lk_stateowner);
2790         nfs4_unlock_state();
2791         return status;
2792 }
2793
2794 /*
2795  * LOCKT operation
2796  */
2797 int
2798 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2799 {
2800         struct inode *inode;
2801         struct file file;
2802         struct file_lock file_lock;
2803         struct file_lock *conflicting_lock;
2804         int status;
2805
2806         if (nfs4_in_grace())
2807                 return nfserr_grace;
2808
2809         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2810                  return nfserr_inval;
2811
2812         lockt->lt_stateowner = NULL;
2813         nfs4_lock_state();
2814
2815         status = nfserr_stale_clientid;
2816         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2817                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2818                 goto out;
2819         }
2820
2821         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2822                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2823                 if (status == nfserr_symlink)
2824                         status = nfserr_inval;
2825                 goto out;
2826         }
2827
2828         inode = current_fh->fh_dentry->d_inode;
2829         locks_init_lock(&file_lock);
2830         switch (lockt->lt_type) {
2831                 case NFS4_READ_LT:
2832                 case NFS4_READW_LT:
2833                         file_lock.fl_type = F_RDLCK;
2834                 break;
2835                 case NFS4_WRITE_LT:
2836                 case NFS4_WRITEW_LT:
2837                         file_lock.fl_type = F_WRLCK;
2838                 break;
2839                 default:
2840                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2841                         status = nfserr_inval;
2842                 goto out;
2843         }
2844
2845         lockt->lt_stateowner = find_lockstateowner_str(inode,
2846                         &lockt->lt_clientid, &lockt->lt_owner);
2847         if (lockt->lt_stateowner)
2848                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2849         file_lock.fl_pid = current->tgid;
2850         file_lock.fl_flags = FL_POSIX;
2851
2852         file_lock.fl_start = lockt->lt_offset;
2853         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2854                 file_lock.fl_end = ~(u64)0;
2855         else
2856                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2857
2858         nfs4_transform_lock_offset(&file_lock);
2859
2860         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2861          * since LOCKT doesn't require an OPEN, and therefore a struct
2862          * file may not exist, pass posix_test_lock a struct file with
2863          * only the dentry:inode set.
2864          */
2865         memset(&file, 0, sizeof (struct file));
2866         file.f_dentry = current_fh->fh_dentry;
2867
2868         status = nfs_ok;
2869         conflicting_lock = posix_test_lock(&file, &file_lock);
2870         if (conflicting_lock) {
2871                 status = nfserr_denied;
2872                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2873         }
2874 out:
2875         nfs4_unlock_state();
2876         return status;
2877 }
2878
2879 int
2880 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2881 {
2882         struct nfs4_stateid *stp;
2883         struct file *filp = NULL;
2884         struct file_lock file_lock;
2885         int status;
2886
2887         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2888                 (long long) locku->lu_offset,
2889                 (long long) locku->lu_length);
2890
2891         if (check_lock_length(locku->lu_offset, locku->lu_length))
2892                  return nfserr_inval;
2893
2894         nfs4_lock_state();
2895
2896         if ((status = nfs4_preprocess_seqid_op(current_fh,
2897                                         locku->lu_seqid,
2898                                         &locku->lu_stateid,
2899                                         CHECK_FH | LOCK_STATE,
2900                                         &locku->lu_stateowner, &stp, NULL)))
2901                 goto out;
2902
2903         filp = stp->st_vfs_file;
2904         BUG_ON(!filp);
2905         locks_init_lock(&file_lock);
2906         file_lock.fl_type = F_UNLCK;
2907         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2908         file_lock.fl_pid = current->tgid;
2909         file_lock.fl_file = filp;
2910         file_lock.fl_flags = FL_POSIX;
2911         file_lock.fl_start = locku->lu_offset;
2912
2913         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2914                 file_lock.fl_end = ~(u64)0;
2915         else
2916                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2917         nfs4_transform_lock_offset(&file_lock);
2918
2919         /*
2920         *  Try to unlock the file in the VFS.
2921         */
2922         status = posix_lock_file(filp, &file_lock);
2923         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2924                 file_lock.fl_ops->fl_release_private(&file_lock);
2925         if (status) {
2926                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2927                 goto out_nfserr;
2928         }
2929         /*
2930         * OK, unlock succeeded; the only thing left to do is update the stateid.
2931         */
2932         update_stateid(&stp->st_stateid);
2933         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2934
2935 out:
2936         if (locku->lu_stateowner)
2937                 nfs4_get_stateowner(locku->lu_stateowner);
2938         nfs4_unlock_state();
2939         return status;
2940
2941 out_nfserr:
2942         status = nfserrno(status);
2943         goto out;
2944 }
2945
2946 /*
2947  * returns
2948  *      1: locks held by lockowner
2949  *      0: no locks held by lockowner
2950  */
2951 static int
2952 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2953 {
2954         struct file_lock **flpp;
2955         struct inode *inode = filp->f_dentry->d_inode;
2956         int status = 0;
2957
2958         lock_kernel();
2959         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2960                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2961                         status = 1;
2962                         goto out;
2963         }
2964 out:
2965         unlock_kernel();
2966         return status;
2967 }
2968
2969 int
2970 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2971 {
2972         clientid_t *clid = &rlockowner->rl_clientid;
2973         struct nfs4_stateowner *local = NULL;
2974         struct xdr_netobj *owner = &rlockowner->rl_owner;
2975         int status;
2976
2977         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2978                 clid->cl_boot, clid->cl_id);
2979
2980         /* XXX check for lease expiration */
2981
2982         status = nfserr_stale_clientid;
2983         if (STALE_CLIENTID(clid)) {
2984                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
2985                 return status;
2986         }
2987
2988         nfs4_lock_state();
2989
2990         status = nfs_ok;
2991         local = find_lockstateowner(owner, clid);
2992         if (local) {
2993                 struct nfs4_stateid *stp;
2994
2995                 /* check for any locks held by any stateid
2996                  * associated with the (lock) stateowner */
2997                 status = nfserr_locks_held;
2998                 list_for_each_entry(stp, &local->so_perfilestate,
2999                                 st_perfilestate) {
3000                         if (check_for_locks(stp->st_vfs_file, local))
3001                                 goto out;
3002                 }
3003                 /* no locks held by (lock) stateowner */
3004                 status = nfs_ok;
3005                 release_stateowner(local);
3006         }
3007 out:
3008         nfs4_unlock_state();
3009         return status;
3010 }
3011
3012 static inline struct nfs4_client_reclaim *
3013 alloc_reclaim(int namelen)
3014 {
3015         struct nfs4_client_reclaim *crp = NULL;
3016
3017         crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3018         if (!crp)
3019                 return NULL;
3020         crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3021         if (!crp->cr_name.data) {
3022                 kfree(crp);
3023                 return NULL;
3024         }
3025         return crp;
3026 }
3027
3028 /*
3029  * failure => all reset bets are off, nfserr_no_grace...
3030  */
3031 static int
3032 nfs4_client_to_reclaim(char *name, int namlen)
3033 {
3034         unsigned int strhashval;
3035         struct nfs4_client_reclaim *crp = NULL;
3036
3037         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3038         crp = alloc_reclaim(namlen);
3039         if (!crp)
3040                 return 0;
3041         strhashval = clientstr_hashval(name, namlen);
3042         INIT_LIST_HEAD(&crp->cr_strhash);
3043         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3044         memcpy(crp->cr_name.data, name, namlen);
3045         crp->cr_name.len = namlen;
3046         reclaim_str_hashtbl_size++;
3047         return 1;
3048 }
3049
3050 static void
3051 nfs4_release_reclaim(void)
3052 {
3053         struct nfs4_client_reclaim *crp = NULL;
3054         int i;
3055
3056         BUG_ON(!nfs4_reclaim_init);
3057         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3058                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3059                         crp = list_entry(reclaim_str_hashtbl[i].next,
3060                                         struct nfs4_client_reclaim, cr_strhash);
3061                         list_del(&crp->cr_strhash);
3062                         kfree(crp->cr_name.data);
3063                         kfree(crp);
3064                         reclaim_str_hashtbl_size--;
3065                 }
3066         }
3067         BUG_ON(reclaim_str_hashtbl_size);
3068 }
3069
3070 /*
3071  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3072 struct nfs4_client_reclaim *
3073 nfs4_find_reclaim_client(clientid_t *clid)
3074 {
3075         unsigned int strhashval;
3076         struct nfs4_client *clp;
3077         struct nfs4_client_reclaim *crp = NULL;
3078
3079
3080         /* find clientid in conf_id_hashtbl */
3081         clp = find_confirmed_client(clid);
3082         if (clp == NULL)
3083                 return NULL;
3084
3085         dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3086                             clp->cl_name.len, clp->cl_name.data);
3087
3088         /* find clp->cl_name in reclaim_str_hashtbl */
3089         strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3090         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3091                 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3092                         return crp;
3093                 }
3094         }
3095         return NULL;
3096 }
3097
3098 /*
3099 * Called from OPEN. Look for clientid in reclaim list.
3100 */
3101 int
3102 nfs4_check_open_reclaim(clientid_t *clid)
3103 {
3104         struct nfs4_client_reclaim *crp;
3105
3106         if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
3107                 return nfserr_reclaim_bad;
3108         return nfs_ok;
3109 }
3110
3111
3112 /*
3113  * Start and stop routines
3114  */
3115
3116 static void
3117 __nfs4_state_init(void)
3118 {
3119         int i;
3120         time_t grace_time;
3121
3122         if (!nfs4_reclaim_init) {
3123                 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3124                         INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3125                 reclaim_str_hashtbl_size = 0;
3126                 nfs4_reclaim_init = 1;
3127         }
3128         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3129                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3130                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3131                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3132                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3133         }
3134         for (i = 0; i < FILE_HASH_SIZE; i++) {
3135                 INIT_LIST_HEAD(&file_hashtbl[i]);
3136         }
3137         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3138                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3139                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3140         }
3141         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3142                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3143                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3144         }
3145         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3146                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3147                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3148         }
3149         memset(&zerostateid, 0, sizeof(stateid_t));
3150         memset(&onestateid, ~0, sizeof(stateid_t));
3151
3152         INIT_LIST_HEAD(&close_lru);
3153         INIT_LIST_HEAD(&client_lru);
3154         INIT_LIST_HEAD(&del_recall_lru);
3155         spin_lock_init(&recall_lock);
3156         boot_time = get_seconds();
3157         grace_time = max(old_lease_time, lease_time);
3158         if (reclaim_str_hashtbl_size == 0)
3159                 grace_time = 0;
3160         if (grace_time)
3161                 printk("NFSD: starting %ld-second grace period\n", grace_time);
3162         grace_end = boot_time + grace_time;
3163         INIT_WORK(&laundromat_work,laundromat_main, NULL);
3164         schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
3165 }
3166
3167 int
3168 nfs4_state_init(void)
3169 {
3170         int status;
3171
3172         if (nfs4_init)
3173                 return 0;
3174         status = nfsd4_init_slabs();
3175         if (status)
3176                 return status;
3177         __nfs4_state_init();
3178         nfs4_init = 1;
3179         return 0;
3180 }
3181
3182 int
3183 nfs4_in_grace(void)
3184 {
3185         return get_seconds() < grace_end;
3186 }
3187
3188 void
3189 set_no_grace(void)
3190 {
3191         printk("NFSD: ERROR in reboot recovery.  State reclaims will fail.\n");
3192         grace_end = get_seconds();
3193 }
3194
3195 time_t
3196 nfs4_lease_time(void)
3197 {
3198         return lease_time;
3199 }
3200
3201 static void
3202 __nfs4_state_shutdown(void)
3203 {
3204         int i;
3205         struct nfs4_client *clp = NULL;
3206         struct nfs4_delegation *dp = NULL;
3207         struct nfs4_stateowner *sop = NULL;
3208         struct list_head *pos, *next, reaplist;
3209
3210         list_for_each_safe(pos, next, &close_lru) {
3211                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3212                 list_del(&sop->so_close_lru);
3213                 nfs4_put_stateowner(sop);
3214         }
3215
3216         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3217                 while (!list_empty(&conf_id_hashtbl[i])) {
3218                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3219                         expire_client(clp);
3220                 }
3221                 while (!list_empty(&unconf_str_hashtbl[i])) {
3222                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3223                         expire_client(clp);
3224                 }
3225         }
3226         INIT_LIST_HEAD(&reaplist);
3227         spin_lock(&recall_lock);
3228         list_for_each_safe(pos, next, &del_recall_lru) {
3229                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3230                 list_move(&dp->dl_recall_lru, &reaplist);
3231         }
3232         spin_unlock(&recall_lock);
3233         list_for_each_safe(pos, next, &reaplist) {
3234                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3235                 list_del_init(&dp->dl_recall_lru);
3236                 unhash_delegation(dp);
3237         }
3238
3239         release_all_files();
3240         cancel_delayed_work(&laundromat_work);
3241         flush_scheduled_work();
3242         nfs4_init = 0;
3243         dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
3244                         list_add_perfile, list_del_perfile);
3245         dprintk("NFSD: add_perclient %d del_perclient %d\n",
3246                         add_perclient, del_perclient);
3247         dprintk("NFSD: alloc_file %d free_file %d\n",
3248                         alloc_file, free_file);
3249         dprintk("NFSD: vfsopen %d vfsclose %d\n",
3250                         vfsopen, vfsclose);
3251         dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
3252                         alloc_delegation, free_delegation);
3253
3254 }
3255
3256 void
3257 nfs4_state_shutdown(void)
3258 {
3259         nfs4_lock_state();
3260         nfs4_release_reclaim();
3261         __nfs4_state_shutdown();
3262         nfsd4_free_slabs();
3263         nfs4_unlock_state();
3264 }
3265
3266 /*
3267  * Called when leasetime is changed.
3268  *
3269  * if nfsd is not started, simply set the global lease.
3270  *
3271  * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
3272  * e.g: boot_time is reset, existing nfs4_client structs are
3273  * used to fill reclaim_str_hashtbl, then all state (except for the
3274  * reclaim_str_hashtbl) is re-initialized.
3275  *
3276  * if the old lease time is greater than the new lease time, the grace
3277  * period needs to be set to the old lease time to allow clients to reclaim
3278  * their state. XXX - we may want to set the grace period == lease time
3279  * after an initial grace period == old lease time
3280  *
3281  * if an error occurs in this process, the new lease is set, but the server
3282  * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
3283  * which means OPEN/LOCK/READ/WRITE will fail during grace period.
3284  *
3285  * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
3286  * OPEN and LOCK reclaims.
3287  */
3288 void
3289 nfs4_reset_lease(time_t leasetime)
3290 {
3291         struct nfs4_client *clp;
3292         int i;
3293
3294         printk("NFSD: New leasetime %ld\n",leasetime);
3295         if (!nfs4_init)
3296                 return;
3297         nfs4_lock_state();
3298         old_lease_time = lease_time;
3299         lease_time = leasetime;
3300
3301         nfs4_release_reclaim();
3302
3303         /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
3304         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3305                 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
3306                         if (!nfs4_client_to_reclaim(clp->cl_name.data,
3307                                                 clp->cl_name.len)) {
3308                                 nfs4_release_reclaim();
3309                                 goto init_state;
3310                         }
3311                 }
3312         }
3313 init_state:
3314         __nfs4_state_shutdown();
3315         __nfs4_state_init();
3316         nfs4_unlock_state();
3317 }
3318