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 inline int
1530 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1531 {
1532         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1533                 return nfserr_openmode;
1534         else
1535                 return nfs_ok;
1536 }
1537
1538 static struct nfs4_delegation *
1539 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1540 {
1541         struct nfs4_delegation *dp;
1542
1543         list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
1544                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1545                         return dp;
1546         }
1547         return NULL;
1548 }
1549
1550 static void
1551 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1552                 struct nfs4_delegation **dp)
1553 {
1554         int flags;
1555         int status;
1556
1557         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1558         if (*dp == NULL)
1559                 return;
1560         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1561                                                 RD_STATE : WR_STATE;
1562         status = nfs4_check_delegmode(*dp, flags);
1563         if (status)
1564                 *dp = NULL;
1565         return;
1566 }
1567
1568 static int
1569 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1570 {
1571         struct nfs4_stateid *local;
1572         int status = nfserr_share_denied;
1573         struct nfs4_stateowner *sop = open->op_stateowner;
1574
1575         list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
1576                 /* ignore lock owners */
1577                 if (local->st_stateowner->so_is_open_owner == 0)
1578                         continue;
1579                 /* remember if we have seen this open owner */
1580                 if (local->st_stateowner == sop)
1581                         *stpp = local;
1582                 /* check for conflicting share reservations */
1583                 if (!test_share(local, open))
1584                         goto out;
1585         }
1586         status = 0;
1587 out:
1588         return status;
1589 }
1590
1591 static int
1592 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1593                 struct nfs4_delegation *dp,
1594                 struct svc_fh *cur_fh, int flags)
1595 {
1596         struct nfs4_stateid *stp;
1597
1598         stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
1599         if (stp == NULL)
1600                 return nfserr_resource;
1601
1602         if (dp) {
1603                 get_file(dp->dl_vfs_file);
1604                 stp->st_vfs_file = dp->dl_vfs_file;
1605         } else {
1606                 int status;
1607                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1608                                 &stp->st_vfs_file);
1609                 if (status) {
1610                         if (status == nfserr_dropit)
1611                                 status = nfserr_jukebox;
1612                         kfree(stp);
1613                         return status;
1614                 }
1615         }
1616         vfsopen++;
1617         *stpp = stp;
1618         return 0;
1619 }
1620
1621 static inline int
1622 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1623                 struct nfsd4_open *open)
1624 {
1625         struct iattr iattr = {
1626                 .ia_valid = ATTR_SIZE,
1627                 .ia_size = 0,
1628         };
1629         if (!open->op_truncate)
1630                 return 0;
1631         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1632                 return -EINVAL;
1633         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1634 }
1635
1636 static int
1637 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1638 {
1639         struct file *filp = stp->st_vfs_file;
1640         struct inode *inode = filp->f_dentry->d_inode;
1641         unsigned int share_access;
1642         int status;
1643
1644         set_access(&share_access, stp->st_access_bmap);
1645         share_access = ~share_access;
1646         share_access &= open->op_share_access;
1647
1648         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1649                 return nfsd4_truncate(rqstp, cur_fh, open);
1650
1651         status = get_write_access(inode);
1652         if (status)
1653                 return nfserrno(status);
1654         status = nfsd4_truncate(rqstp, cur_fh, open);
1655         if (status) {
1656                 put_write_access(inode);
1657                 return status;
1658         }
1659         /* remember the open */
1660         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1661         set_bit(open->op_share_access, &stp->st_access_bmap);
1662         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1663
1664         return nfs_ok;
1665 }
1666
1667
1668 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1669 static void
1670 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1671 {
1672         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1673                 if (*status)
1674                         *status = nfserr_reclaim_bad;
1675                 else {
1676                         open->op_stateowner->so_confirmed = 1;
1677                         open->op_stateowner->so_seqid--;
1678                 }
1679         }
1680 }
1681
1682 /*
1683  * Attempt to hand out a delegation.
1684  */
1685 static void
1686 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1687 {
1688         struct nfs4_delegation *dp;
1689         struct nfs4_stateowner *sop = stp->st_stateowner;
1690         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1691         struct file_lock fl, *flp = &fl;
1692         int status, flag = 0;
1693
1694         flag = NFS4_OPEN_DELEGATE_NONE;
1695         if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
1696              || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
1697                 goto out;
1698
1699         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1700                 flag = NFS4_OPEN_DELEGATE_WRITE;
1701         else
1702                 flag = NFS4_OPEN_DELEGATE_READ;
1703
1704         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1705         if (dp == NULL) {
1706                 flag = NFS4_OPEN_DELEGATE_NONE;
1707                 goto out;
1708         }
1709         locks_init_lock(&fl);
1710         fl.fl_lmops = &nfsd_lease_mng_ops;
1711         fl.fl_flags = FL_LEASE;
1712         fl.fl_end = OFFSET_MAX;
1713         fl.fl_owner =  (fl_owner_t)dp;
1714         fl.fl_file = stp->st_vfs_file;
1715         fl.fl_pid = current->tgid;
1716
1717         /* setlease checks to see if delegation should be handed out.
1718          * the lock_manager callbacks fl_mylease and fl_change are used
1719          */
1720         if ((status = setlease(stp->st_vfs_file,
1721                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1722                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1723                 unhash_delegation(dp);
1724                 flag = NFS4_OPEN_DELEGATE_NONE;
1725                 goto out;
1726         }
1727
1728         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1729
1730         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1731                      dp->dl_stateid.si_boot,
1732                      dp->dl_stateid.si_stateownerid,
1733                      dp->dl_stateid.si_fileid,
1734                      dp->dl_stateid.si_generation);
1735 out:
1736         open->op_delegate_type = flag;
1737 }
1738
1739 /*
1740  * called with nfs4_lock_state() held.
1741  */
1742 int
1743 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1744 {
1745         struct nfs4_file *fp = NULL;
1746         struct inode *ino = current_fh->fh_dentry->d_inode;
1747         struct nfs4_stateid *stp = NULL;
1748         struct nfs4_delegation *dp = NULL;
1749         int status;
1750
1751         status = nfserr_inval;
1752         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1753                 goto out;
1754         /*
1755          * Lookup file; if found, lookup stateid and check open request,
1756          * and check for delegations in the process of being recalled.
1757          * If not found, create the nfs4_file struct
1758          */
1759         fp = find_file(ino);
1760         if (fp) {
1761                 if ((status = nfs4_check_open(fp, open, &stp)))
1762                         goto out;
1763                 nfs4_check_deleg(fp, open, &dp);
1764         } else {
1765                 status = nfserr_resource;
1766                 fp = alloc_init_file(ino);
1767                 if (fp == NULL)
1768                         goto out;
1769         }
1770
1771         /*
1772          * OPEN the file, or upgrade an existing OPEN.
1773          * If truncate fails, the OPEN fails.
1774          */
1775         if (stp) {
1776                 /* Stateid was found, this is an OPEN upgrade */
1777                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1778                 if (status)
1779                         goto out;
1780         } else {
1781                 /* Stateid was not found, this is a new OPEN */
1782                 int flags = 0;
1783                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1784                         flags = MAY_WRITE;
1785                 else
1786                         flags = MAY_READ;
1787                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1788                 if (status)
1789                         goto out;
1790                 init_stateid(stp, fp, open);
1791                 status = nfsd4_truncate(rqstp, current_fh, open);
1792                 if (status) {
1793                         release_stateid(stp, OPEN_STATE);
1794                         goto out;
1795                 }
1796         }
1797         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1798
1799         /*
1800         * Attempt to hand out a delegation. No error return, because the
1801         * OPEN succeeds even if we fail.
1802         */
1803         nfs4_open_delegation(current_fh, open, stp);
1804
1805         status = nfs_ok;
1806
1807         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1808                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1809                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1810 out:
1811         /* take the opportunity to clean up unused state */
1812         if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
1813                 release_file(fp);
1814
1815         /* CLAIM_PREVIOUS has different error returns */
1816         nfs4_set_claim_prev(open, &status);
1817         /*
1818         * To finish the open response, we just need to set the rflags.
1819         */
1820         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1821         if (!open->op_stateowner->so_confirmed)
1822                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1823
1824         return status;
1825 }
1826
1827 static struct work_struct laundromat_work;
1828 static void laundromat_main(void *);
1829 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1830
1831 int
1832 nfsd4_renew(clientid_t *clid)
1833 {
1834         struct nfs4_client *clp;
1835         int status;
1836
1837         nfs4_lock_state();
1838         dprintk("process_renew(%08x/%08x): starting\n",
1839                         clid->cl_boot, clid->cl_id);
1840         status = nfserr_stale_clientid;
1841         if (STALE_CLIENTID(clid))
1842                 goto out;
1843         clp = find_confirmed_client(clid);
1844         status = nfserr_expired;
1845         if (clp == NULL) {
1846                 /* We assume the client took too long to RENEW. */
1847                 dprintk("nfsd4_renew: clientid not found!\n");
1848                 goto out;
1849         }
1850         renew_client(clp);
1851         status = nfserr_cb_path_down;
1852         if (!list_empty(&clp->cl_del_perclnt)
1853                         && !atomic_read(&clp->cl_callback.cb_set))
1854                 goto out;
1855         status = nfs_ok;
1856 out:
1857         nfs4_unlock_state();
1858         return status;
1859 }
1860
1861 time_t
1862 nfs4_laundromat(void)
1863 {
1864         struct nfs4_client *clp;
1865         struct nfs4_stateowner *sop;
1866         struct nfs4_delegation *dp;
1867         struct list_head *pos, *next, reaplist;
1868         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1869         time_t t, clientid_val = NFSD_LEASE_TIME;
1870         time_t u, test_val = NFSD_LEASE_TIME;
1871
1872         nfs4_lock_state();
1873
1874         dprintk("NFSD: laundromat service - starting\n");
1875         list_for_each_safe(pos, next, &client_lru) {
1876                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1877                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1878                         t = clp->cl_time - cutoff;
1879                         if (clientid_val > t)
1880                                 clientid_val = t;
1881                         break;
1882                 }
1883                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1884                         clp->cl_clientid.cl_id);
1885                 expire_client(clp);
1886         }
1887         INIT_LIST_HEAD(&reaplist);
1888         spin_lock(&recall_lock);
1889         list_for_each_safe(pos, next, &del_recall_lru) {
1890                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1891                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1892                         u = dp->dl_time - cutoff;
1893                         if (test_val > u)
1894                                 test_val = u;
1895                         break;
1896                 }
1897                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1898                                     dp, dp->dl_flock);
1899                 list_move(&dp->dl_recall_lru, &reaplist);
1900         }
1901         spin_unlock(&recall_lock);
1902         list_for_each_safe(pos, next, &reaplist) {
1903                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1904                 list_del_init(&dp->dl_recall_lru);
1905                 unhash_delegation(dp);
1906         }
1907         test_val = NFSD_LEASE_TIME;
1908         list_for_each_safe(pos, next, &close_lru) {
1909                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1910                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1911                         u = sop->so_time - cutoff;
1912                         if (test_val > u)
1913                                 test_val = u;
1914                         break;
1915                 }
1916                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1917                         sop->so_id);
1918                 list_del(&sop->so_close_lru);
1919                 nfs4_put_stateowner(sop);
1920         }
1921         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1922                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1923         nfs4_unlock_state();
1924         return clientid_val;
1925 }
1926
1927 void
1928 laundromat_main(void *not_used)
1929 {
1930         time_t t;
1931
1932         t = nfs4_laundromat();
1933         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1934         schedule_delayed_work(&laundromat_work, t*HZ);
1935 }
1936
1937 /* search ownerid_hashtbl[] and close_lru for stateid owner
1938  * (stateid->si_stateownerid)
1939  */
1940 struct nfs4_stateowner *
1941 find_openstateowner_id(u32 st_id, int flags) {
1942         struct nfs4_stateowner *local = NULL;
1943
1944         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1945         if (flags & CLOSE_STATE) {
1946                 list_for_each_entry(local, &close_lru, so_close_lru) {
1947                         if (local->so_id == st_id)
1948                                 return local;
1949                 }
1950         }
1951         return NULL;
1952 }
1953
1954 static inline int
1955 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1956 {
1957         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1958 }
1959
1960 static int
1961 STALE_STATEID(stateid_t *stateid)
1962 {
1963         if (stateid->si_boot == boot_time)
1964                 return 0;
1965         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1966                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1967                 stateid->si_generation);
1968         return 1;
1969 }
1970
1971 static inline int
1972 access_permit_read(unsigned long access_bmap)
1973 {
1974         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1975                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1976                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1977 }
1978
1979 static inline int
1980 access_permit_write(unsigned long access_bmap)
1981 {
1982         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1983                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1984 }
1985
1986 static
1987 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1988 {
1989         int status = nfserr_openmode;
1990
1991         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1992                 goto out;
1993         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1994                 goto out;
1995         status = nfs_ok;
1996 out:
1997         return status;
1998 }
1999
2000 static inline int
2001 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2002 {
2003         /* Trying to call delegreturn with a special stateid? Yuch: */
2004         if (!(flags & (RD_STATE | WR_STATE)))
2005                 return nfserr_bad_stateid;
2006         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2007                 return nfs_ok;
2008         else if (nfs4_in_grace()) {
2009                 /* Answer in remaining cases depends on existance of
2010                  * conflicting state; so we must wait out the grace period. */
2011                 return nfserr_grace;
2012         } else if (flags & WR_STATE)
2013                 return nfs4_share_conflict(current_fh,
2014                                 NFS4_SHARE_DENY_WRITE);
2015         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2016                 return nfs4_share_conflict(current_fh,
2017                                 NFS4_SHARE_DENY_READ);
2018 }
2019
2020 /*
2021  * Allow READ/WRITE during grace period on recovered state only for files
2022  * that are not able to provide mandatory locking.
2023  */
2024 static inline int
2025 io_during_grace_disallowed(struct inode *inode, int flags)
2026 {
2027         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2028                 && MANDATORY_LOCK(inode);
2029 }
2030
2031 /*
2032 * Checks for stateid operations
2033 */
2034 int
2035 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2036 {
2037         struct nfs4_stateid *stp = NULL;
2038         struct nfs4_delegation *dp = NULL;
2039         stateid_t *stidp;
2040         struct inode *ino = current_fh->fh_dentry->d_inode;
2041         int status;
2042
2043         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2044                 stateid->si_boot, stateid->si_stateownerid,
2045                 stateid->si_fileid, stateid->si_generation);
2046         if (filpp)
2047                 *filpp = NULL;
2048
2049         if (io_during_grace_disallowed(ino, flags))
2050                 return nfserr_grace;
2051
2052         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2053                 return check_special_stateids(current_fh, stateid, flags);
2054
2055         /* STALE STATEID */
2056         status = nfserr_stale_stateid;
2057         if (STALE_STATEID(stateid))
2058                 goto out;
2059
2060         /* BAD STATEID */
2061         status = nfserr_bad_stateid;
2062         if (!stateid->si_fileid) { /* delegation stateid */
2063                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2064                         dprintk("NFSD: delegation stateid not found\n");
2065                         if (nfs4_in_grace())
2066                                 status = nfserr_grace;
2067                         goto out;
2068                 }
2069                 stidp = &dp->dl_stateid;
2070         } else { /* open or lock stateid */
2071                 if (!(stp = find_stateid(stateid, flags))) {
2072                         dprintk("NFSD: open or lock stateid not found\n");
2073                         if (nfs4_in_grace())
2074                                 status = nfserr_grace;
2075                         goto out;
2076                 }
2077                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2078                         goto out;
2079                 if (!stp->st_stateowner->so_confirmed)
2080                         goto out;
2081                 stidp = &stp->st_stateid;
2082         }
2083         if (stateid->si_generation > stidp->si_generation)
2084                 goto out;
2085
2086         /* OLD STATEID */
2087         status = nfserr_old_stateid;
2088         if (stateid->si_generation < stidp->si_generation)
2089                 goto out;
2090         if (stp) {
2091                 if ((status = nfs4_check_openmode(stp,flags)))
2092                         goto out;
2093                 renew_client(stp->st_stateowner->so_client);
2094                 if (filpp)
2095                         *filpp = stp->st_vfs_file;
2096         } else if (dp) {
2097                 if ((status = nfs4_check_delegmode(dp, flags)))
2098                         goto out;
2099                 renew_client(dp->dl_client);
2100                 if (flags & DELEG_RET)
2101                         unhash_delegation(dp);
2102                 if (filpp)
2103                         *filpp = dp->dl_vfs_file;
2104         }
2105         status = nfs_ok;
2106 out:
2107         return status;
2108 }
2109
2110
2111 /*
2112  * Checks for sequence id mutating operations.
2113  */
2114 int
2115 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)
2116 {
2117         int status;
2118         struct nfs4_stateid *stp;
2119         struct nfs4_stateowner *sop;
2120
2121         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2122                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2123                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2124                 stateid->si_generation);
2125
2126         *stpp = NULL;
2127         *sopp = NULL;
2128
2129         status = nfserr_bad_stateid;
2130         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2131                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2132                 goto out;
2133         }
2134
2135         status = nfserr_stale_stateid;
2136         if (STALE_STATEID(stateid))
2137                 goto out;
2138         /*
2139         * We return BAD_STATEID if filehandle doesn't match stateid,
2140         * the confirmed flag is incorrecly set, or the generation
2141         * number is incorrect.
2142         * If there is no entry in the openfile table for this id,
2143         * we can't always return BAD_STATEID;
2144         * this might be a retransmitted CLOSE which has arrived after
2145         * the openfile has been released.
2146         */
2147         if (!(stp = find_stateid(stateid, flags)))
2148                 goto no_nfs4_stateid;
2149
2150         status = nfserr_bad_stateid;
2151
2152         /* for new lock stateowners:
2153          * check that the lock->v.new.open_stateid
2154          * refers to an open stateowner
2155          *
2156          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2157          * as the open_stateid->st_stateowner->so_client->clientid
2158          */
2159         if (lockclid) {
2160                 struct nfs4_stateowner *sop = stp->st_stateowner;
2161                 struct nfs4_client *clp = sop->so_client;
2162
2163                 if (!sop->so_is_open_owner)
2164                         goto out;
2165                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2166                         goto out;
2167         }
2168
2169         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2170                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2171                 goto out;
2172         }
2173
2174         *stpp = stp;
2175         *sopp = sop = stp->st_stateowner;
2176
2177         /*
2178         *  We now validate the seqid and stateid generation numbers.
2179         *  For the moment, we ignore the possibility of
2180         *  generation number wraparound.
2181         */
2182         if (seqid != sop->so_seqid + 1)
2183                 goto check_replay;
2184
2185         if (sop->so_confirmed) {
2186                 if (flags & CONFIRM) {
2187                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2188                         goto out;
2189                 }
2190         }
2191         else {
2192                 if (!(flags & CONFIRM)) {
2193                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2194                         goto out;
2195                 }
2196         }
2197         if (stateid->si_generation > stp->st_stateid.si_generation) {
2198                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2199                 goto out;
2200         }
2201
2202         status = nfserr_old_stateid;
2203         if (stateid->si_generation < stp->st_stateid.si_generation) {
2204                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2205                 goto out;
2206         }
2207         /* XXX renew the client lease here */
2208         status = nfs_ok;
2209
2210 out:
2211         return status;
2212
2213 no_nfs4_stateid:
2214
2215         /*
2216         * We determine whether this is a bad stateid or a replay,
2217         * starting by trying to look up the stateowner.
2218         * If stateowner is not found - stateid is bad.
2219         */
2220         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2221                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2222                 status = nfserr_bad_stateid;
2223                 goto out;
2224         }
2225         *sopp = sop;
2226
2227 check_replay:
2228         if (seqid == sop->so_seqid) {
2229                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2230                 /* indicate replay to calling function */
2231                 status = NFSERR_REPLAY_ME;
2232         } else  {
2233                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2234
2235                 *sopp = NULL;
2236                 status = nfserr_bad_seqid;
2237         }
2238         goto out;
2239 }
2240
2241 int
2242 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2243 {
2244         int status;
2245         struct nfs4_stateowner *sop;
2246         struct nfs4_stateid *stp;
2247
2248         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2249                         (int)current_fh->fh_dentry->d_name.len,
2250                         current_fh->fh_dentry->d_name.name);
2251
2252         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2253                 goto out;
2254
2255         nfs4_lock_state();
2256
2257         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2258                                         &oc->oc_req_stateid,
2259                                         CHECK_FH | CONFIRM | OPEN_STATE,
2260                                         &oc->oc_stateowner, &stp, NULL)))
2261                 goto out;
2262
2263         sop = oc->oc_stateowner;
2264         sop->so_confirmed = 1;
2265         update_stateid(&stp->st_stateid);
2266         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2267         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2268                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2269                          stp->st_stateid.si_boot,
2270                          stp->st_stateid.si_stateownerid,
2271                          stp->st_stateid.si_fileid,
2272                          stp->st_stateid.si_generation);
2273 out:
2274         if (oc->oc_stateowner)
2275                 nfs4_get_stateowner(oc->oc_stateowner);
2276         nfs4_unlock_state();
2277         return status;
2278 }
2279
2280
2281 /*
2282  * unset all bits in union bitmap (bmap) that
2283  * do not exist in share (from successful OPEN_DOWNGRADE)
2284  */
2285 static void
2286 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2287 {
2288         int i;
2289         for (i = 1; i < 4; i++) {
2290                 if ((i & access) != i)
2291                         __clear_bit(i, bmap);
2292         }
2293 }
2294
2295 static void
2296 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2297 {
2298         int i;
2299         for (i = 0; i < 4; i++) {
2300                 if ((i & deny) != i)
2301                         __clear_bit(i, bmap);
2302         }
2303 }
2304
2305 int
2306 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2307 {
2308         int status;
2309         struct nfs4_stateid *stp;
2310         unsigned int share_access;
2311
2312         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2313                         (int)current_fh->fh_dentry->d_name.len,
2314                         current_fh->fh_dentry->d_name.name);
2315
2316         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2317                 return nfserr_inval;
2318
2319         nfs4_lock_state();
2320         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2321                                         &od->od_stateid,
2322                                         CHECK_FH | OPEN_STATE,
2323                                         &od->od_stateowner, &stp, NULL)))
2324                 goto out;
2325
2326         status = nfserr_inval;
2327         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2328                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2329                         stp->st_access_bmap, od->od_share_access);
2330                 goto out;
2331         }
2332         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2333                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2334                         stp->st_deny_bmap, od->od_share_deny);
2335                 goto out;
2336         }
2337         set_access(&share_access, stp->st_access_bmap);
2338         nfs4_file_downgrade(stp->st_vfs_file,
2339                             share_access & ~od->od_share_access);
2340
2341         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2342         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2343
2344         update_stateid(&stp->st_stateid);
2345         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2346         status = nfs_ok;
2347 out:
2348         if (od->od_stateowner)
2349                 nfs4_get_stateowner(od->od_stateowner);
2350         nfs4_unlock_state();
2351         return status;
2352 }
2353
2354 /*
2355  * nfs4_unlock_state() called after encode
2356  */
2357 int
2358 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2359 {
2360         int status;
2361         struct nfs4_stateid *stp;
2362
2363         dprintk("NFSD: nfsd4_close on file %.*s\n",
2364                         (int)current_fh->fh_dentry->d_name.len,
2365                         current_fh->fh_dentry->d_name.name);
2366
2367         nfs4_lock_state();
2368         /* check close_lru for replay */
2369         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2370                                         &close->cl_stateid,
2371                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2372                                         &close->cl_stateowner, &stp, NULL)))
2373                 goto out;
2374         /*
2375         *  Return success, but first update the stateid.
2376         */
2377         status = nfs_ok;
2378         update_stateid(&stp->st_stateid);
2379         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2380
2381         /* release_state_owner() calls nfsd_close() if needed */
2382         release_state_owner(stp, OPEN_STATE);
2383 out:
2384         if (close->cl_stateowner)
2385                 nfs4_get_stateowner(close->cl_stateowner);
2386         nfs4_unlock_state();
2387         return status;
2388 }
2389
2390 int
2391 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2392 {
2393         int status;
2394
2395         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2396                 goto out;
2397
2398         nfs4_lock_state();
2399         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2400         nfs4_unlock_state();
2401 out:
2402         return status;
2403 }
2404
2405
2406 /*
2407  * Lock owner state (byte-range locks)
2408  */
2409 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2410 #define LOCK_HASH_BITS              8
2411 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2412 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2413
2414 #define lockownerid_hashval(id) \
2415         ((id) & LOCK_HASH_MASK)
2416
2417 static inline unsigned int
2418 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2419                 struct xdr_netobj *ownername)
2420 {
2421         return (file_hashval(inode) + cl_id
2422                         + opaque_hashval(ownername->data, ownername->len))
2423                 & LOCK_HASH_MASK;
2424 }
2425
2426 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2427 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2428 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2429
2430 struct nfs4_stateid *
2431 find_stateid(stateid_t *stid, int flags)
2432 {
2433         struct nfs4_stateid *local = NULL;
2434         u32 st_id = stid->si_stateownerid;
2435         u32 f_id = stid->si_fileid;
2436         unsigned int hashval;
2437
2438         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2439         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2440                 hashval = stateid_hashval(st_id, f_id);
2441                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2442                         if ((local->st_stateid.si_stateownerid == st_id) &&
2443                             (local->st_stateid.si_fileid == f_id))
2444                                 return local;
2445                 }
2446         }
2447         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2448                 hashval = stateid_hashval(st_id, f_id);
2449                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2450                         if ((local->st_stateid.si_stateownerid == st_id) &&
2451                             (local->st_stateid.si_fileid == f_id))
2452                                 return local;
2453                 }
2454         } else
2455                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2456         return NULL;
2457 }
2458
2459 static struct nfs4_delegation *
2460 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2461 {
2462         struct nfs4_file *fp = NULL;
2463
2464         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2465                     stid->si_boot, stid->si_stateownerid,
2466                     stid->si_fileid, stid->si_generation);
2467
2468         fp = find_file(ino);
2469         if (fp)
2470                 return find_delegation_file(fp, stid);
2471         return NULL;
2472 }
2473
2474 /*
2475  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2476  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2477  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2478  * locking, this prevents us from being completely protocol-compliant.  The
2479  * real solution to this problem is to start using unsigned file offsets in
2480  * the VFS, but this is a very deep change!
2481  */
2482 static inline void
2483 nfs4_transform_lock_offset(struct file_lock *lock)
2484 {
2485         if (lock->fl_start < 0)
2486                 lock->fl_start = OFFSET_MAX;
2487         if (lock->fl_end < 0)
2488                 lock->fl_end = OFFSET_MAX;
2489 }
2490
2491 int
2492 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2493 {
2494         struct nfs4_stateowner *local = NULL;
2495         int status = 0;
2496
2497         if (hashval >= LOCK_HASH_SIZE)
2498                 goto out;
2499         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2500                 if (local == sop) {
2501                         status = 1;
2502                         goto out;
2503                 }
2504         }
2505 out:
2506         return status;
2507 }
2508
2509
2510 static inline void
2511 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2512 {
2513         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2514         unsigned int hval = lockownerid_hashval(sop->so_id);
2515
2516         deny->ld_sop = NULL;
2517         if (nfs4_verify_lock_stateowner(sop, hval)) {
2518                 kref_get(&sop->so_ref);
2519                 deny->ld_sop = sop;
2520                 deny->ld_clientid = sop->so_client->cl_clientid;
2521         }
2522         deny->ld_start = fl->fl_start;
2523         deny->ld_length = ~(u64)0;
2524         if (fl->fl_end != ~(u64)0)
2525                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2526         deny->ld_type = NFS4_READ_LT;
2527         if (fl->fl_type != F_RDLCK)
2528                 deny->ld_type = NFS4_WRITE_LT;
2529 }
2530
2531 static struct nfs4_stateowner *
2532 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2533 {
2534         struct nfs4_stateowner *local = NULL;
2535         int i;
2536
2537         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2538                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2539                         if (!cmp_owner_str(local, owner, clid))
2540                                 continue;
2541                         return local;
2542                 }
2543         }
2544         return NULL;
2545 }
2546
2547 static struct nfs4_stateowner *
2548 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2549                 struct xdr_netobj *owner)
2550 {
2551         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2552         struct nfs4_stateowner *op;
2553
2554         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2555                 if (cmp_owner_str(op, owner, clid))
2556                         return op;
2557         }
2558         return NULL;
2559 }
2560
2561 /*
2562  * Alloc a lock owner structure.
2563  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2564  * occured.
2565  *
2566  * strhashval = lock_ownerstr_hashval
2567  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2568  */
2569
2570 static struct nfs4_stateowner *
2571 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2572         struct nfs4_stateowner *sop;
2573         struct nfs4_replay *rp;
2574         unsigned int idhashval;
2575
2576         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2577                 return NULL;
2578         idhashval = lockownerid_hashval(current_ownerid);
2579         INIT_LIST_HEAD(&sop->so_idhash);
2580         INIT_LIST_HEAD(&sop->so_strhash);
2581         INIT_LIST_HEAD(&sop->so_perclient);
2582         INIT_LIST_HEAD(&sop->so_perfilestate);
2583         INIT_LIST_HEAD(&sop->so_perlockowner);
2584         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2585         sop->so_time = 0;
2586         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2587         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2588         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2589         sop->so_is_open_owner = 0;
2590         sop->so_id = current_ownerid++;
2591         sop->so_client = clp;
2592         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2593         sop->so_confirmed = 1;
2594         rp = &sop->so_replay;
2595         rp->rp_status = NFSERR_SERVERFAULT;
2596         rp->rp_buflen = 0;
2597         rp->rp_buf = rp->rp_ibuf;
2598         return sop;
2599 }
2600
2601 struct nfs4_stateid *
2602 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2603 {
2604         struct nfs4_stateid *stp;
2605         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2606
2607         if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2608                                         GFP_KERNEL)) == NULL)
2609                 goto out;
2610         INIT_LIST_HEAD(&stp->st_hash);
2611         INIT_LIST_HEAD(&stp->st_perfile);
2612         INIT_LIST_HEAD(&stp->st_perfilestate);
2613         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2614         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2615         list_add(&stp->st_perfile, &fp->fi_perfile);
2616         list_add_perfile++;
2617         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2618         stp->st_stateowner = sop;
2619         stp->st_file = fp;
2620         stp->st_stateid.si_boot = boot_time;
2621         stp->st_stateid.si_stateownerid = sop->so_id;
2622         stp->st_stateid.si_fileid = fp->fi_id;
2623         stp->st_stateid.si_generation = 0;
2624         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2625         stp->st_access_bmap = open_stp->st_access_bmap;
2626         stp->st_deny_bmap = open_stp->st_deny_bmap;
2627
2628 out:
2629         return stp;
2630 }
2631
2632 int
2633 check_lock_length(u64 offset, u64 length)
2634 {
2635         return ((length == 0)  || ((length != ~(u64)0) &&
2636              LOFF_OVERFLOW(offset, length)));
2637 }
2638
2639 /*
2640  *  LOCK operation
2641  */
2642 int
2643 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2644 {
2645         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2646         struct nfs4_stateid *lock_stp;
2647         struct file *filp;
2648         struct file_lock file_lock;
2649         struct file_lock *conflock;
2650         int status = 0;
2651         unsigned int strhashval;
2652
2653         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2654                 (long long) lock->lk_offset,
2655                 (long long) lock->lk_length);
2656
2657         if (nfs4_in_grace() && !lock->lk_reclaim)
2658                 return nfserr_grace;
2659         if (!nfs4_in_grace() && lock->lk_reclaim)
2660                 return nfserr_no_grace;
2661
2662         if (check_lock_length(lock->lk_offset, lock->lk_length))
2663                  return nfserr_inval;
2664
2665         nfs4_lock_state();
2666
2667         if (lock->lk_is_new) {
2668         /*
2669          * Client indicates that this is a new lockowner.
2670          * Use open owner and open stateid to create lock owner and lock
2671          * stateid.
2672          */
2673                 struct nfs4_stateid *open_stp = NULL;
2674                 struct nfs4_file *fp;
2675
2676                 status = nfserr_stale_clientid;
2677                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2678                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2679                         goto out;
2680                 }
2681
2682                 /* is the new lock seqid presented by the client zero? */
2683                 status = nfserr_bad_seqid;
2684                 if (lock->v.new.lock_seqid != 0)
2685                         goto out;
2686
2687                 /* validate and update open stateid and open seqid */
2688                 status = nfs4_preprocess_seqid_op(current_fh,
2689                                         lock->lk_new_open_seqid,
2690                                         &lock->lk_new_open_stateid,
2691                                         CHECK_FH | OPEN_STATE,
2692                                         &open_sop, &open_stp,
2693                                         &lock->v.new.clientid);
2694                 if (status) {
2695                         if (lock->lk_reclaim)
2696                                 status = nfserr_reclaim_bad;
2697                         goto out;
2698                 }
2699                 /* create lockowner and lock stateid */
2700                 fp = open_stp->st_file;
2701                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2702                                 open_sop->so_client->cl_clientid.cl_id,
2703                                 &lock->v.new.owner);
2704                 /*
2705                  * If we already have this lock owner, the client is in
2706                  * error (or our bookeeping is wrong!)
2707                  * for asking for a 'new lock'.
2708                  */
2709                 status = nfserr_bad_stateid;
2710                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2711                                                 &lock->v.new.clientid);
2712                 if (lock_sop)
2713                         goto out;
2714                 status = nfserr_resource;
2715                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2716                         goto out;
2717                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2718                                                 fp, open_stp)) == NULL) {
2719                         release_stateowner(lock->lk_stateowner);
2720                         lock->lk_stateowner = NULL;
2721                         goto out;
2722                 }
2723                 /* bump the open seqid used to create the lock */
2724                 open_sop->so_seqid++;
2725         } else {
2726                 /* lock (lock owner + lock stateid) already exists */
2727                 status = nfs4_preprocess_seqid_op(current_fh,
2728                                        lock->lk_old_lock_seqid,
2729                                        &lock->lk_old_lock_stateid,
2730                                        CHECK_FH | LOCK_STATE,
2731                                        &lock->lk_stateowner, &lock_stp, NULL);
2732                 if (status)
2733                         goto out;
2734         }
2735         /* lock->lk_stateowner and lock_stp have been created or found */
2736         filp = lock_stp->st_vfs_file;
2737
2738         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2739                 printk("NFSD: nfsd4_lock: permission denied!\n");
2740                 goto out;
2741         }
2742
2743         locks_init_lock(&file_lock);
2744         switch (lock->lk_type) {
2745                 case NFS4_READ_LT:
2746                 case NFS4_READW_LT:
2747                         file_lock.fl_type = F_RDLCK;
2748                 break;
2749                 case NFS4_WRITE_LT:
2750                 case NFS4_WRITEW_LT:
2751                         file_lock.fl_type = F_WRLCK;
2752                 break;
2753                 default:
2754                         status = nfserr_inval;
2755                 goto out;
2756         }
2757         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2758         file_lock.fl_pid = current->tgid;
2759         file_lock.fl_file = filp;
2760         file_lock.fl_flags = FL_POSIX;
2761
2762         file_lock.fl_start = lock->lk_offset;
2763         if ((lock->lk_length == ~(u64)0) ||
2764                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2765                 file_lock.fl_end = ~(u64)0;
2766         else
2767                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2768         nfs4_transform_lock_offset(&file_lock);
2769
2770         /*
2771         * Try to lock the file in the VFS.
2772         * Note: locks.c uses the BKL to protect the inode's lock list.
2773         */
2774
2775         status = posix_lock_file(filp, &file_lock);
2776         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2777                 file_lock.fl_ops->fl_release_private(&file_lock);
2778         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2779         switch (-status) {
2780         case 0: /* success! */
2781                 update_stateid(&lock_stp->st_stateid);
2782                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2783                                 sizeof(stateid_t));
2784                 goto out;
2785         case (EAGAIN):
2786                 goto conflicting_lock;
2787         case (EDEADLK):
2788                 status = nfserr_deadlock;
2789         default:
2790                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2791                 goto out_destroy_new_stateid;
2792         }
2793
2794 conflicting_lock:
2795         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2796         status = nfserr_denied;
2797         /* XXX There is a race here. Future patch needed to provide
2798          * an atomic posix_lock_and_test_file
2799          */
2800         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2801                 status = nfserr_serverfault;
2802                 goto out;
2803         }
2804         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2805
2806 out_destroy_new_stateid:
2807         if (lock->lk_is_new) {
2808                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2809         /*
2810         * An error encountered after instantiation of the new
2811         * stateid has forced us to destroy it.
2812         */
2813                 if (!seqid_mutating_err(status))
2814                         open_sop->so_seqid--;
2815
2816                 release_state_owner(lock_stp, LOCK_STATE);
2817         }
2818 out:
2819         if (lock->lk_stateowner)
2820                 nfs4_get_stateowner(lock->lk_stateowner);
2821         nfs4_unlock_state();
2822         return status;
2823 }
2824
2825 /*
2826  * LOCKT operation
2827  */
2828 int
2829 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2830 {
2831         struct inode *inode;
2832         struct file file;
2833         struct file_lock file_lock;
2834         struct file_lock *conflicting_lock;
2835         int status;
2836
2837         if (nfs4_in_grace())
2838                 return nfserr_grace;
2839
2840         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2841                  return nfserr_inval;
2842
2843         lockt->lt_stateowner = NULL;
2844         nfs4_lock_state();
2845
2846         status = nfserr_stale_clientid;
2847         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2848                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2849                 goto out;
2850         }
2851
2852         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2853                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2854                 if (status == nfserr_symlink)
2855                         status = nfserr_inval;
2856                 goto out;
2857         }
2858
2859         inode = current_fh->fh_dentry->d_inode;
2860         locks_init_lock(&file_lock);
2861         switch (lockt->lt_type) {
2862                 case NFS4_READ_LT:
2863                 case NFS4_READW_LT:
2864                         file_lock.fl_type = F_RDLCK;
2865                 break;
2866                 case NFS4_WRITE_LT:
2867                 case NFS4_WRITEW_LT:
2868                         file_lock.fl_type = F_WRLCK;
2869                 break;
2870                 default:
2871                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2872                         status = nfserr_inval;
2873                 goto out;
2874         }
2875
2876         lockt->lt_stateowner = find_lockstateowner_str(inode,
2877                         &lockt->lt_clientid, &lockt->lt_owner);
2878         if (lockt->lt_stateowner)
2879                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2880         file_lock.fl_pid = current->tgid;
2881         file_lock.fl_flags = FL_POSIX;
2882
2883         file_lock.fl_start = lockt->lt_offset;
2884         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2885                 file_lock.fl_end = ~(u64)0;
2886         else
2887                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2888
2889         nfs4_transform_lock_offset(&file_lock);
2890
2891         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2892          * since LOCKT doesn't require an OPEN, and therefore a struct
2893          * file may not exist, pass posix_test_lock a struct file with
2894          * only the dentry:inode set.
2895          */
2896         memset(&file, 0, sizeof (struct file));
2897         file.f_dentry = current_fh->fh_dentry;
2898
2899         status = nfs_ok;
2900         conflicting_lock = posix_test_lock(&file, &file_lock);
2901         if (conflicting_lock) {
2902                 status = nfserr_denied;
2903                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2904         }
2905 out:
2906         nfs4_unlock_state();
2907         return status;
2908 }
2909
2910 int
2911 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2912 {
2913         struct nfs4_stateid *stp;
2914         struct file *filp = NULL;
2915         struct file_lock file_lock;
2916         int status;
2917
2918         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2919                 (long long) locku->lu_offset,
2920                 (long long) locku->lu_length);
2921
2922         if (check_lock_length(locku->lu_offset, locku->lu_length))
2923                  return nfserr_inval;
2924
2925         nfs4_lock_state();
2926
2927         if ((status = nfs4_preprocess_seqid_op(current_fh,
2928                                         locku->lu_seqid,
2929                                         &locku->lu_stateid,
2930                                         CHECK_FH | LOCK_STATE,
2931                                         &locku->lu_stateowner, &stp, NULL)))
2932                 goto out;
2933
2934         filp = stp->st_vfs_file;
2935         BUG_ON(!filp);
2936         locks_init_lock(&file_lock);
2937         file_lock.fl_type = F_UNLCK;
2938         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2939         file_lock.fl_pid = current->tgid;
2940         file_lock.fl_file = filp;
2941         file_lock.fl_flags = FL_POSIX;
2942         file_lock.fl_start = locku->lu_offset;
2943
2944         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2945                 file_lock.fl_end = ~(u64)0;
2946         else
2947                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2948         nfs4_transform_lock_offset(&file_lock);
2949
2950         /*
2951         *  Try to unlock the file in the VFS.
2952         */
2953         status = posix_lock_file(filp, &file_lock);
2954         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2955                 file_lock.fl_ops->fl_release_private(&file_lock);
2956         if (status) {
2957                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2958                 goto out_nfserr;
2959         }
2960         /*
2961         * OK, unlock succeeded; the only thing left to do is update the stateid.
2962         */
2963         update_stateid(&stp->st_stateid);
2964         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2965
2966 out:
2967         if (locku->lu_stateowner)
2968                 nfs4_get_stateowner(locku->lu_stateowner);
2969         nfs4_unlock_state();
2970         return status;
2971
2972 out_nfserr:
2973         status = nfserrno(status);
2974         goto out;
2975 }
2976
2977 /*
2978  * returns
2979  *      1: locks held by lockowner
2980  *      0: no locks held by lockowner
2981  */
2982 static int
2983 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2984 {
2985         struct file_lock **flpp;
2986         struct inode *inode = filp->f_dentry->d_inode;
2987         int status = 0;
2988
2989         lock_kernel();
2990         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2991                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2992                         status = 1;
2993                         goto out;
2994         }
2995 out:
2996         unlock_kernel();
2997         return status;
2998 }
2999
3000 int
3001 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3002 {
3003         clientid_t *clid = &rlockowner->rl_clientid;
3004         struct nfs4_stateowner *local = NULL;
3005         struct xdr_netobj *owner = &rlockowner->rl_owner;
3006         int status;
3007
3008         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3009                 clid->cl_boot, clid->cl_id);
3010
3011         /* XXX check for lease expiration */
3012
3013         status = nfserr_stale_clientid;
3014         if (STALE_CLIENTID(clid)) {
3015                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3016                 return status;
3017         }
3018
3019         nfs4_lock_state();
3020
3021         status = nfs_ok;
3022         local = find_lockstateowner(owner, clid);
3023         if (local) {
3024                 struct nfs4_stateid *stp;
3025
3026                 /* check for any locks held by any stateid
3027                  * associated with the (lock) stateowner */
3028                 status = nfserr_locks_held;
3029                 list_for_each_entry(stp, &local->so_perfilestate,
3030                                 st_perfilestate) {
3031                         if (check_for_locks(stp->st_vfs_file, local))
3032                                 goto out;
3033                 }
3034                 /* no locks held by (lock) stateowner */
3035                 status = nfs_ok;
3036                 release_stateowner(local);
3037         }
3038 out:
3039         nfs4_unlock_state();
3040         return status;
3041 }
3042
3043 static inline struct nfs4_client_reclaim *
3044 alloc_reclaim(int namelen)
3045 {
3046         struct nfs4_client_reclaim *crp = NULL;
3047
3048         crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3049         if (!crp)
3050                 return NULL;
3051         crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3052         if (!crp->cr_name.data) {
3053                 kfree(crp);
3054                 return NULL;
3055         }
3056         return crp;
3057 }
3058
3059 /*
3060  * failure => all reset bets are off, nfserr_no_grace...
3061  */
3062 static int
3063 nfs4_client_to_reclaim(char *name, int namlen)
3064 {
3065         unsigned int strhashval;
3066         struct nfs4_client_reclaim *crp = NULL;
3067
3068         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3069         crp = alloc_reclaim(namlen);
3070         if (!crp)
3071                 return 0;
3072         strhashval = clientstr_hashval(name, namlen);
3073         INIT_LIST_HEAD(&crp->cr_strhash);
3074         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3075         memcpy(crp->cr_name.data, name, namlen);
3076         crp->cr_name.len = namlen;
3077         reclaim_str_hashtbl_size++;
3078         return 1;
3079 }
3080
3081 static void
3082 nfs4_release_reclaim(void)
3083 {
3084         struct nfs4_client_reclaim *crp = NULL;
3085         int i;
3086
3087         BUG_ON(!nfs4_reclaim_init);
3088         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3089                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3090                         crp = list_entry(reclaim_str_hashtbl[i].next,
3091                                         struct nfs4_client_reclaim, cr_strhash);
3092                         list_del(&crp->cr_strhash);
3093                         kfree(crp->cr_name.data);
3094                         kfree(crp);
3095                         reclaim_str_hashtbl_size--;
3096                 }
3097         }
3098         BUG_ON(reclaim_str_hashtbl_size);
3099 }
3100
3101 /*
3102  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3103 struct nfs4_client_reclaim *
3104 nfs4_find_reclaim_client(clientid_t *clid)
3105 {
3106         unsigned int strhashval;
3107         struct nfs4_client *clp;
3108         struct nfs4_client_reclaim *crp = NULL;
3109
3110
3111         /* find clientid in conf_id_hashtbl */
3112         clp = find_confirmed_client(clid);
3113         if (clp == NULL)
3114                 return NULL;
3115
3116         dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3117                             clp->cl_name.len, clp->cl_name.data);
3118
3119         /* find clp->cl_name in reclaim_str_hashtbl */
3120         strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3121         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3122                 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3123                         return crp;
3124                 }
3125         }
3126         return NULL;
3127 }
3128
3129 /*
3130 * Called from OPEN. Look for clientid in reclaim list.
3131 */
3132 int
3133 nfs4_check_open_reclaim(clientid_t *clid)
3134 {
3135         struct nfs4_client_reclaim *crp;
3136
3137         if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
3138                 return nfserr_reclaim_bad;
3139         return nfs_ok;
3140 }
3141
3142
3143 /*
3144  * Start and stop routines
3145  */
3146
3147 static void
3148 __nfs4_state_init(void)
3149 {
3150         int i;
3151         time_t grace_time;
3152
3153         if (!nfs4_reclaim_init) {
3154                 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3155                         INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3156                 reclaim_str_hashtbl_size = 0;
3157                 nfs4_reclaim_init = 1;
3158         }
3159         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3160                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3161                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3162                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3163                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3164         }
3165         for (i = 0; i < FILE_HASH_SIZE; i++) {
3166                 INIT_LIST_HEAD(&file_hashtbl[i]);
3167         }
3168         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3169                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3170                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3171         }
3172         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3173                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3174                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3175         }
3176         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3177                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3178                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3179         }
3180         memset(&zerostateid, 0, sizeof(stateid_t));
3181         memset(&onestateid, ~0, sizeof(stateid_t));
3182
3183         INIT_LIST_HEAD(&close_lru);
3184         INIT_LIST_HEAD(&client_lru);
3185         INIT_LIST_HEAD(&del_recall_lru);
3186         spin_lock_init(&recall_lock);
3187         boot_time = get_seconds();
3188         grace_time = max(old_lease_time, lease_time);
3189         if (reclaim_str_hashtbl_size == 0)
3190                 grace_time = 0;
3191         if (grace_time)
3192                 printk("NFSD: starting %ld-second grace period\n", grace_time);
3193         grace_end = boot_time + grace_time;
3194         INIT_WORK(&laundromat_work,laundromat_main, NULL);
3195         schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
3196 }
3197
3198 int
3199 nfs4_state_init(void)
3200 {
3201         int status;
3202
3203         if (nfs4_init)
3204                 return 0;
3205         status = nfsd4_init_slabs();
3206         if (status)
3207                 return status;
3208         __nfs4_state_init();
3209         nfs4_init = 1;
3210         return 0;
3211 }
3212
3213 int
3214 nfs4_in_grace(void)
3215 {
3216         return get_seconds() < grace_end;
3217 }
3218
3219 void
3220 set_no_grace(void)
3221 {
3222         printk("NFSD: ERROR in reboot recovery.  State reclaims will fail.\n");
3223         grace_end = get_seconds();
3224 }
3225
3226 time_t
3227 nfs4_lease_time(void)
3228 {
3229         return lease_time;
3230 }
3231
3232 static void
3233 __nfs4_state_shutdown(void)
3234 {
3235         int i;
3236         struct nfs4_client *clp = NULL;
3237         struct nfs4_delegation *dp = NULL;
3238         struct nfs4_stateowner *sop = NULL;
3239         struct list_head *pos, *next, reaplist;
3240
3241         list_for_each_safe(pos, next, &close_lru) {
3242                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3243                 list_del(&sop->so_close_lru);
3244                 nfs4_put_stateowner(sop);
3245         }
3246
3247         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3248                 while (!list_empty(&conf_id_hashtbl[i])) {
3249                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3250                         expire_client(clp);
3251                 }
3252                 while (!list_empty(&unconf_str_hashtbl[i])) {
3253                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3254                         expire_client(clp);
3255                 }
3256         }
3257         INIT_LIST_HEAD(&reaplist);
3258         spin_lock(&recall_lock);
3259         list_for_each_safe(pos, next, &del_recall_lru) {
3260                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3261                 list_move(&dp->dl_recall_lru, &reaplist);
3262         }
3263         spin_unlock(&recall_lock);
3264         list_for_each_safe(pos, next, &reaplist) {
3265                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3266                 list_del_init(&dp->dl_recall_lru);
3267                 unhash_delegation(dp);
3268         }
3269
3270         release_all_files();
3271         cancel_delayed_work(&laundromat_work);
3272         flush_scheduled_work();
3273         nfs4_init = 0;
3274         dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
3275                         list_add_perfile, list_del_perfile);
3276         dprintk("NFSD: add_perclient %d del_perclient %d\n",
3277                         add_perclient, del_perclient);
3278         dprintk("NFSD: alloc_file %d free_file %d\n",
3279                         alloc_file, free_file);
3280         dprintk("NFSD: vfsopen %d vfsclose %d\n",
3281                         vfsopen, vfsclose);
3282         dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
3283                         alloc_delegation, free_delegation);
3284
3285 }
3286
3287 void
3288 nfs4_state_shutdown(void)
3289 {
3290         nfs4_lock_state();
3291         nfs4_release_reclaim();
3292         __nfs4_state_shutdown();
3293         nfsd4_free_slabs();
3294         nfs4_unlock_state();
3295 }
3296
3297 /*
3298  * Called when leasetime is changed.
3299  *
3300  * if nfsd is not started, simply set the global lease.
3301  *
3302  * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
3303  * e.g: boot_time is reset, existing nfs4_client structs are
3304  * used to fill reclaim_str_hashtbl, then all state (except for the
3305  * reclaim_str_hashtbl) is re-initialized.
3306  *
3307  * if the old lease time is greater than the new lease time, the grace
3308  * period needs to be set to the old lease time to allow clients to reclaim
3309  * their state. XXX - we may want to set the grace period == lease time
3310  * after an initial grace period == old lease time
3311  *
3312  * if an error occurs in this process, the new lease is set, but the server
3313  * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
3314  * which means OPEN/LOCK/READ/WRITE will fail during grace period.
3315  *
3316  * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
3317  * OPEN and LOCK reclaims.
3318  */
3319 void
3320 nfs4_reset_lease(time_t leasetime)
3321 {
3322         struct nfs4_client *clp;
3323         int i;
3324
3325         printk("NFSD: New leasetime %ld\n",leasetime);
3326         if (!nfs4_init)
3327                 return;
3328         nfs4_lock_state();
3329         old_lease_time = lease_time;
3330         lease_time = leasetime;
3331
3332         nfs4_release_reclaim();
3333
3334         /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
3335         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3336                 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
3337                         if (!nfs4_client_to_reclaim(clp->cl_name.data,
3338                                                 clp->cl_name.len)) {
3339                                 nfs4_release_reclaim();
3340                                 goto init_state;
3341                         }
3342                 }
3343         }
3344 init_state:
3345         __nfs4_state_shutdown();
3346         __nfs4_state_init();
3347         nfs4_unlock_state();
3348 }
3349