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         setlease(filp, F_UNLCK, &dp->dl_flock);
 194         nfsd_close(filp);
 195         vfsclose++;
 196 }
 197
 198 /* Called under the state lock. */
 199 static void
 200 unhash_delegation(struct nfs4_delegation *dp)
 201 {
 202         list_del_init(&dp->dl_del_perfile);
 203         list_del_init(&dp->dl_del_perclnt);
 204         spin_lock(&recall_lock);
 205         list_del_init(&dp->dl_recall_lru);
 206         spin_unlock(&recall_lock);
 207         nfs4_close_delegation(dp);
 208         nfs4_put_delegation(dp);
 209 }
 210
 211 /*
 212  * SETCLIENTID state
 213  */
 214
 215 /* Hash tables for nfs4_clientid state */
 216 #define CLIENT_HASH_BITS                 4
 217 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 218 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 219
 220 #define clientid_hashval(id) \
 221         ((id) & CLIENT_HASH_MASK)
 222 #define clientstr_hashval(name, namelen) \
 223         (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
 224 /*
 225  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 226  * used in reboot/reset lease grace period processing
 227  *
 228  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 229  * setclientid_confirmed info.
 230  *
 231  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 232  * setclientid info.
 233  *
 234  * client_lru holds client queue ordered by nfs4_client.cl_time
 235  * for lease renewal.
 236  *
 237  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 238  * for last close replay.
 239  */
 240 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 241 static int reclaim_str_hashtbl_size = 0;
 242 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 243 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 244 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 245 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 246 static struct list_head client_lru;
 247 static struct list_head close_lru;
 248
 249 static inline void
 250 renew_client(struct nfs4_client *clp)
 251 {
 252         /*
 253         * Move client to the end to the LRU list.
 254         */
 255         dprintk("renewing client (clientid %08x/%08x)\n",
 256                         clp->cl_clientid.cl_boot,
 257                         clp->cl_clientid.cl_id);
 258         list_move_tail(&clp->cl_lru, &client_lru);
 259         clp->cl_time = get_seconds();
 260 }
 261
 262 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 263 static int
 264 STALE_CLIENTID(clientid_t *clid)
 265 {
 266         if (clid->cl_boot == boot_time)
 267                 return 0;
 268         dprintk("NFSD stale clientid (%08x/%08x)\n",
 269                         clid->cl_boot, clid->cl_id);
 270         return 1;
 271 }
 272
 273 /*
 274  * XXX Should we use a slab cache ?
 275  * This type of memory management is somewhat inefficient, but we use it
 276  * anyway since SETCLIENTID is not a common operation.
 277  */
 278 static inline struct nfs4_client *
 279 alloc_client(struct xdr_netobj name)
 280 {
 281         struct nfs4_client *clp;
 282
 283         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 284                 memset(clp, 0, sizeof(*clp));
 285                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 286                         memcpy(clp->cl_name.data, name.data, name.len);
 287                         clp->cl_name.len = name.len;
 288                 }
 289                 else {
 290                         kfree(clp);
 291                         clp = NULL;
 292                 }
 293         }
 294         return clp;
 295 }
 296
 297 static inline void
 298 free_client(struct nfs4_client *clp)
 299 {
 300         if (clp->cl_cred.cr_group_info)
 301                 put_group_info(clp->cl_cred.cr_group_info);
 302         kfree(clp->cl_name.data);
 303         kfree(clp);
 304 }
 305
 306 void
 307 put_nfs4_client(struct nfs4_client *clp)
 308 {
 309         if (atomic_dec_and_test(&clp->cl_count))
 310                 free_client(clp);
 311 }
 312
 313 static void
 314 expire_client(struct nfs4_client *clp)
 315 {
 316         struct nfs4_stateowner *sop;
 317         struct nfs4_delegation *dp;
 318         struct nfs4_callback *cb = &clp->cl_callback;
 319         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 320         struct list_head reaplist;
 321
 322         dprintk("NFSD: expire_client cl_count %d\n",
 323                             atomic_read(&clp->cl_count));
 324
 325         /* shutdown rpc client, ending any outstanding recall rpcs */
 326         if (atomic_read(&cb->cb_set) == 1 && clnt) {
 327                 rpc_shutdown_client(clnt);
 328                 clnt = clp->cl_callback.cb_client = NULL;
 329         }
 330
 331         INIT_LIST_HEAD(&reaplist);
 332         spin_lock(&recall_lock);
 333         while (!list_empty(&clp->cl_del_perclnt)) {
 334                 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
 335                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 336                                 dp->dl_flock);
 337                 list_del_init(&dp->dl_del_perclnt);
 338                 list_move(&dp->dl_recall_lru, &reaplist);
 339         }
 340         spin_unlock(&recall_lock);
 341         while (!list_empty(&reaplist)) {
 342                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 343                 list_del_init(&dp->dl_recall_lru);
 344                 unhash_delegation(dp);
 345         }
 346         list_del(&clp->cl_idhash);
 347         list_del(&clp->cl_strhash);
 348         list_del(&clp->cl_lru);
 349         while (!list_empty(&clp->cl_perclient)) {
 350                 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
 351                 release_stateowner(sop);
 352         }
 353         put_nfs4_client(clp);
 354 }
 355
 356 static struct nfs4_client *
 357 create_client(struct xdr_netobj name) {
 358         struct nfs4_client *clp;
 359
 360         if (!(clp = alloc_client(name)))
 361                 goto out;
 362         atomic_set(&clp->cl_count, 1);
 363         atomic_set(&clp->cl_callback.cb_set, 0);
 364         clp->cl_callback.cb_parsed = 0;
 365         INIT_LIST_HEAD(&clp->cl_idhash);
 366         INIT_LIST_HEAD(&clp->cl_strhash);
 367         INIT_LIST_HEAD(&clp->cl_perclient);
 368         INIT_LIST_HEAD(&clp->cl_del_perclnt);
 369         INIT_LIST_HEAD(&clp->cl_lru);
 370 out:
 371         return clp;
 372 }
 373
 374 static void
 375 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 376         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 377 }
 378
 379 static void
 380 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 381         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 382         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 383 }
 384
 385 static void
 386 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 387
 388         target->cr_uid = source->cr_uid;
 389         target->cr_gid = source->cr_gid;
 390         target->cr_group_info = source->cr_group_info;
 391         get_group_info(target->cr_group_info);
 392 }
 393
 394 static int
 395 cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
 396         if (!n1 || !n2)
 397                 return 0;
 398         return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
 399 }
 400
 401 static int
 402 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 403         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 404 }
 405
 406 static int
 407 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 408         return((cl1->cl_boot == cl2->cl_boot) &&
 409                 (cl1->cl_id == cl2->cl_id));
 410 }
 411
 412 /* XXX what about NGROUP */
 413 static int
 414 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 415         return(cr1->cr_uid == cr2->cr_uid);
 416
 417 }
 418
 419 static void
 420 gen_clid(struct nfs4_client *clp) {
 421         clp->cl_clientid.cl_boot = boot_time;
 422         clp->cl_clientid.cl_id = current_clientid++;
 423 }
 424
 425 static void
 426 gen_confirm(struct nfs4_client *clp) {
 427         struct timespec         tv;
 428         u32 *                   p;
 429
 430         tv = CURRENT_TIME;
 431         p = (u32 *)clp->cl_confirm.data;
 432         *p++ = tv.tv_sec;
 433         *p++ = tv.tv_nsec;
 434 }
 435
 436 static int
 437 check_name(struct xdr_netobj name) {
 438
 439         if (name.len == 0)
 440                 return 0;
 441         if (name.len > NFS4_OPAQUE_LIMIT) {
 442                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 443                 return 0;
 444         }
 445         return 1;
 446 }
 447
 448 void
 449 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 450 {
 451         unsigned int idhashval;
 452
 453         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 454         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 455         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 456         list_add_tail(&clp->cl_lru, &client_lru);
 457         clp->cl_time = get_seconds();
 458 }
 459
 460 void
 461 move_to_confirmed(struct nfs4_client *clp)
 462 {
 463         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 464         unsigned int strhashval;
 465
 466         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 467         list_del_init(&clp->cl_strhash);
 468         list_del_init(&clp->cl_idhash);
 469         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 470         strhashval = clientstr_hashval(clp->cl_name.data,
 471                         clp->cl_name.len);
 472         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 473         renew_client(clp);
 474 }
 475
 476 static struct nfs4_client *
 477 find_confirmed_client(clientid_t *clid)
 478 {
 479         struct nfs4_client *clp;
 480         unsigned int idhashval = clientid_hashval(clid->cl_id);
 481
 482         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 483                 if (cmp_clid(&clp->cl_clientid, clid))
 484                         return clp;
 485         }
 486         return NULL;
 487 }
 488
 489 static struct nfs4_client *
 490 find_unconfirmed_client(clientid_t *clid)
 491 {
 492         struct nfs4_client *clp;
 493         unsigned int idhashval = clientid_hashval(clid->cl_id);
 494
 495         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 496                 if (cmp_clid(&clp->cl_clientid, clid))
 497                         return clp;
 498         }
 499         return NULL;
 500 }
 501
 502 /* a helper function for parse_callback */
 503 static int
 504 parse_octet(unsigned int *lenp, char **addrp)
 505 {
 506         unsigned int len = *lenp;
 507         char *p = *addrp;
 508         int n = -1;
 509         char c;
 510
 511         for (;;) {
 512                 if (!len)
 513                         break;
 514                 len--;
 515                 c = *p++;
 516                 if (c == '.')
 517                         break;
 518                 if ((c < '0') || (c > '9')) {
 519                         n = -1;
 520                         break;
 521                 }
 522                 if (n < 0)
 523                         n = 0;
 524                 n = (n * 10) + (c - '0');
 525                 if (n > 255) {
 526                         n = -1;
 527                         break;
 528                 }
 529         }
 530         *lenp = len;
 531         *addrp = p;
 532         return n;
 533 }
 534
 535 /* parse and set the setclientid ipv4 callback address */
 536 int
 537 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 538 {
 539         int temp = 0;
 540         u32 cbaddr = 0;
 541         u16 cbport = 0;
 542         u32 addrlen = addr_len;
 543         char *addr = addr_val;
 544         int i, shift;
 545
 546         /* ipaddress */
 547         shift = 24;
 548         for(i = 4; i > 0  ; i--) {
 549                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 550                         return 0;
 551                 }
 552                 cbaddr |= (temp << shift);
 553                 if (shift > 0)
 554                 shift -= 8;
 555         }
 556         *cbaddrp = cbaddr;
 557
 558         /* port */
 559         shift = 8;
 560         for(i = 2; i > 0  ; i--) {
 561                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 562                         return 0;
 563                 }
 564                 cbport |= (temp << shift);
 565                 if (shift > 0)
 566                         shift -= 8;
 567         }
 568         *cbportp = cbport;
 569         return 1;
 570 }
 571
 572 void
 573 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 574 {
 575         struct nfs4_callback *cb = &clp->cl_callback;
 576
 577         /* Currently, we only support tcp for the callback channel */
 578         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 579                 goto out_err;
 580
 581         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 582                          &cb->cb_addr, &cb->cb_port)))
 583                 goto out_err;
 584         cb->cb_prog = se->se_callback_prog;
 585         cb->cb_ident = se->se_callback_ident;
 586         cb->cb_parsed = 1;
 587         return;
 588 out_err:
 589         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 590                 "will not receive delegations\n",
 591                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 592
 593         cb->cb_parsed = 0;
 594         return;
 595 }
 596
 597 /*
 598  * RFC 3010 has a complex implmentation description of processing a
 599  * SETCLIENTID request consisting of 5 bullets, labeled as
 600  * CASE0 - CASE4 below.
 601  *
 602  * NOTES:
 603  *      callback information will be processed in a future patch
 604  *
 605  *      an unconfirmed record is added when:
 606  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 607  *      CASE 1: confirmed record found with matching name, principal,
 608  *              verifier, and clientid.
 609  *      CASE 2: confirmed record found with matching name, principal,
 610  *              and there is no unconfirmed record with matching
 611  *              name and principal
 612  *
 613  *      an unconfirmed record is replaced when:
 614  *      CASE 3: confirmed record found with matching name, principal,
 615  *              and an unconfirmed record is found with matching
 616  *              name, principal, and with clientid and
 617  *              confirm that does not match the confirmed record.
 618  *      CASE 4: there is no confirmed record with matching name and
 619  *              principal. there is an unconfirmed record with
 620  *              matching name, principal.
 621  *
 622  *      an unconfirmed record is deleted when:
 623  *      CASE 1: an unconfirmed record that matches input name, verifier,
 624  *              and confirmed clientid.
 625  *      CASE 4: any unconfirmed records with matching name and principal
 626  *              that exist after an unconfirmed record has been replaced
 627  *              as described above.
 628  *
 629  */
 630 int
 631 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 632 {
 633         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 634         struct xdr_netobj       clname = {
 635                 .len = setclid->se_namelen,
 636                 .data = setclid->se_name,
 637         };
 638         nfs4_verifier           clverifier = setclid->se_verf;
 639         unsigned int            strhashval;
 640         struct nfs4_client *    conf, * unconf, * new, * clp;
 641         int                     status;
 642
 643         status = nfserr_inval;
 644         if (!check_name(clname))
 645                 goto out;
 646
 647         /*
 648          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 649          * We get here on a DRC miss.
 650          */
 651
 652         strhashval = clientstr_hashval(clname.data, clname.len);
 653
 654         conf = NULL;
 655         nfs4_lock_state();
 656         list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
 657                 if (!cmp_name(&clp->cl_name, &clname))
 658                         continue;
 659                 /*
 660                  * CASE 0:
 661                  * clname match, confirmed, different principal
 662                  * or different ip_address
 663                  */
 664                 status = nfserr_clid_inuse;
 665                 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
 666                         printk("NFSD: setclientid: string in use by client"
 667                         "(clientid %08x/%08x)\n",
 668                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 669                         goto out;
 670                 }
 671                 if (clp->cl_addr != ip_addr) {
 672                         printk("NFSD: setclientid: string in use by client"
 673                         "(clientid %08x/%08x)\n",
 674                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 675                         goto out;
 676                 }
 677
 678                 /*
 679                  * cl_name match from a previous SETCLIENTID operation
 680                  * XXX check for additional matches?
 681                  */
 682                 conf = clp;
 683                 break;
 684         }
 685         unconf = NULL;
 686         list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
 687                 if (!cmp_name(&clp->cl_name, &clname))
 688                         continue;
 689                 /* cl_name match from a previous SETCLIENTID operation */
 690                 unconf = clp;
 691                 break;
 692         }
 693         status = nfserr_resource;
 694         if (!conf) {
 695                 /*
 696                  * CASE 4:
 697                  * placed first, because it is the normal case.
 698                  */
 699                 if (unconf)
 700                         expire_client(unconf);
 701                 if (!(new = create_client(clname)))
 702                         goto out;
 703                 copy_verf(new, &clverifier);
 704                 new->cl_addr = ip_addr;
 705                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 706                 gen_clid(new);
 707                 gen_confirm(new);
 708                 gen_callback(new, setclid);
 709                 add_to_unconfirmed(new, strhashval);
 710         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 711                 /*
 712                  * CASE 1:
 713                  * cl_name match, confirmed, principal match
 714                  * verifier match: probable callback update
 715                  *
 716                  * remove any unconfirmed nfs4_client with
 717                  * matching cl_name, cl_verifier, and cl_clientid
 718                  *
 719                  * create and insert an unconfirmed nfs4_client with same
 720                  * cl_name, cl_verifier, and cl_clientid as existing
 721                  * nfs4_client,  but with the new callback info and a
 722                  * new cl_confirm
 723                  */
 724                 if ((unconf) &&
 725                     cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
 726                      cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
 727                                 expire_client(unconf);
 728                 }
 729                 if (!(new = create_client(clname)))
 730                         goto out;
 731                 copy_verf(new,&conf->cl_verifier);
 732                 new->cl_addr = ip_addr;
 733                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 734                 copy_clid(new, conf);
 735                 gen_confirm(new);
 736                 gen_callback(new, setclid);
 737                 add_to_unconfirmed(new,strhashval);
 738         } else if (!unconf) {
 739                 /*
 740                  * CASE 2:
 741                  * clname match, confirmed, principal match
 742                  * verfier does not match
 743                  * no unconfirmed. create a new unconfirmed nfs4_client
 744                  * using input clverifier, clname, and callback info
 745                  * and generate a new cl_clientid and cl_confirm.
 746                  */
 747                 if (!(new = create_client(clname)))
 748                         goto out;
 749                 copy_verf(new,&clverifier);
 750                 new->cl_addr = ip_addr;
 751                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 752                 gen_clid(new);
 753                 gen_confirm(new);
 754                 gen_callback(new, setclid);
 755                 add_to_unconfirmed(new, strhashval);
 756         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 757                 /*
 758                  * CASE3:
 759                  * confirmed found (name, principal match)
 760                  * confirmed verifier does not match input clverifier
 761                  *
 762                  * unconfirmed found (name match)
 763                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 764                  *
 765                  * remove unconfirmed.
 766                  *
 767                  * create an unconfirmed nfs4_client
 768                  * with same cl_name as existing confirmed nfs4_client,
 769                  * but with new callback info, new cl_clientid,
 770                  * new cl_verifier and a new cl_confirm
 771                  */
 772                 expire_client(unconf);
 773                 if (!(new = create_client(clname)))
 774                         goto out;
 775                 copy_verf(new,&clverifier);
 776                 new->cl_addr = ip_addr;
 777                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 778                 gen_clid(new);
 779                 gen_confirm(new);
 780                 gen_callback(new, setclid);
 781                 add_to_unconfirmed(new, strhashval);
 782         } else {
 783                 /* No cases hit !!! */
 784                 status = nfserr_inval;
 785                 goto out;
 786
 787         }
 788         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 789         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 790         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 791         status = nfs_ok;
 792 out:
 793         nfs4_unlock_state();
 794         return status;
 795 }
 796
 797
 798 /*
 799  * RFC 3010 has a complex implmentation description of processing a
 800  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 801  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 802  *
 803  * NOTE: callback information will be processed here in a future patch
 804  */
 805 int
 806 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 807 {
 808         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 809         struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
 810         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 811         clientid_t * clid = &setclientid_confirm->sc_clientid;
 812         int status;
 813
 814         if (STALE_CLIENTID(clid))
 815                 return nfserr_stale_clientid;
 816         /*
 817          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 818          * We get here on a DRC miss.
 819          */
 820
 821         nfs4_lock_state();
 822         clp = find_confirmed_client(clid);
 823         if (clp) {
 824                 status = nfserr_inval;
 825                 /*
 826                  * Found a record for this clientid. If the IP addresses
 827                  * don't match, return ERR_INVAL just as if the record had
 828                  * not been found.
 829                  */
 830                 if (clp->cl_addr != ip_addr) {
 831                         printk("NFSD: setclientid: string in use by client"
 832                         "(clientid %08x/%08x)\n",
 833                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 834                         goto out;
 835                 }
 836                 conf = clp;
 837         }
 838         clp = find_unconfirmed_client(clid);
 839         if (clp) {
 840                 status = nfserr_inval;
 841                 if (clp->cl_addr != ip_addr) {
 842                         printk("NFSD: setclientid: string in use by client"
 843                         "(clientid %08x/%08x)\n",
 844                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 845                         goto out;
 846                 }
 847                 unconf = clp;
 848         }
 849         /* CASE 1:
 850         * unconf record that matches input clientid and input confirm.
 851         * conf record that matches input clientid.
 852         * conf  and unconf records match names, verifiers
 853         */
 854         if ((conf && unconf) &&
 855             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 856             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 857             (cmp_name(&conf->cl_name,&unconf->cl_name))  &&
 858             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 859                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 860                         status = nfserr_clid_inuse;
 861                 else {
 862                         expire_client(conf);
 863                         clp = unconf;
 864                         move_to_confirmed(unconf);
 865                         status = nfs_ok;
 866                 }
 867                 goto out;
 868         }
 869         /* CASE 2:
 870          * conf record that matches input clientid.
 871          * if unconf record that matches input clientid, then unconf->cl_name
 872          * or unconf->cl_verifier don't match the conf record.
 873          */
 874         if ((conf && !unconf) ||
 875             ((conf && unconf) &&
 876              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 877               !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
 878                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 879                         status = nfserr_clid_inuse;
 880                 } else {
 881                         clp = conf;
 882                         status = nfs_ok;
 883                 }
 884                 goto out;
 885         }
 886         /* CASE 3:
 887          * conf record not found.
 888          * unconf record found.
 889          * unconf->cl_confirm matches input confirm
 890          */
 891         if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
 892                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 893                         status = nfserr_clid_inuse;
 894                 } else {
 895                         status = nfs_ok;
 896                         clp = unconf;
 897                         move_to_confirmed(unconf);
 898                 }
 899                 goto out;
 900         }
 901         /* CASE 4:
 902          * conf record not found, or if conf, then conf->cl_confirm does not
 903          * match input confirm.
 904          * unconf record not found, or if unconf, then unconf->cl_confirm
 905          * does not match input confirm.
 906          */
 907         if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
 908             (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
 909                 status = nfserr_stale_clientid;
 910                 goto out;
 911         }
 912         /* check that we have hit one of the cases...*/
 913         status = nfserr_inval;
 914         goto out;
 915 out:
 916         if (!status)
 917                 nfsd4_probe_callback(clp);
 918         nfs4_unlock_state();
 919         return status;
 920 }
 921
 922 /*
 923  * Open owner state (share locks)
 924  */
 925
 926 /* hash tables for nfs4_stateowner */
 927 #define OWNER_HASH_BITS              8
 928 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 929 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 930
 931 #define ownerid_hashval(id) \
 932         ((id) & OWNER_HASH_MASK)
 933 #define ownerstr_hashval(clientid, ownername) \
 934         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 935
 936 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 937 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 938
 939 /* hash table for nfs4_file */
 940 #define FILE_HASH_BITS                   8
 941 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 942 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 943 /* hash table for (open)nfs4_stateid */
 944 #define STATEID_HASH_BITS              10
 945 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 946 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 947
 948 #define file_hashval(x) \
 949         hash_ptr(x, FILE_HASH_BITS)
 950 #define stateid_hashval(owner_id, file_id)  \
 951         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 952
 953 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 954 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 955
 956 /* OPEN Share state helper functions */
 957 static inline struct nfs4_file *
 958 alloc_init_file(struct inode *ino)
 959 {
 960         struct nfs4_file *fp;
 961         unsigned int hashval = file_hashval(ino);
 962
 963         if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
 964                 INIT_LIST_HEAD(&fp->fi_hash);
 965                 INIT_LIST_HEAD(&fp->fi_perfile);
 966                 INIT_LIST_HEAD(&fp->fi_del_perfile);
 967                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 968                 fp->fi_inode = igrab(ino);
 969                 fp->fi_id = current_fileid++;
 970                 alloc_file++;
 971                 return fp;
 972         }
 973         return NULL;
 974 }
 975
 976 static void
 977 release_all_files(void)
 978 {
 979         int i;
 980         struct nfs4_file *fp;
 981
 982         for (i=0;i<FILE_HASH_SIZE;i++) {
 983                 while (!list_empty(&file_hashtbl[i])) {
 984                         fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
 985                         /* this should never be more than once... */
 986                         if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) {
 987                                 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
 988                         }
 989                         release_file(fp);
 990                 }
 991         }
 992 }
 993
 994 kmem_cache_t *stateowner_slab = NULL;
 995
 996 static int
 997 nfsd4_init_slabs(void)
 998 {
 999         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1000                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1001         if (stateowner_slab == NULL) {
1002                 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1003                 return -ENOMEM;
1004         }
1005         return 0;
1006 }
1007
1008 static void
1009 nfsd4_free_slabs(void)
1010 {
1011         int status = 0;
1012
1013         if (stateowner_slab)
1014                 status = kmem_cache_destroy(stateowner_slab);
1015         stateowner_slab = NULL;
1016         BUG_ON(status);
1017 }
1018
1019 void
1020 nfs4_free_stateowner(struct kref *kref)
1021 {
1022         struct nfs4_stateowner *sop =
1023                 container_of(kref, struct nfs4_stateowner, so_ref);
1024         kfree(sop->so_owner.data);
1025         kmem_cache_free(stateowner_slab, sop);
1026 }
1027
1028 static inline struct nfs4_stateowner *
1029 alloc_stateowner(struct xdr_netobj *owner)
1030 {
1031         struct nfs4_stateowner *sop;
1032
1033         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1034                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1035                         memcpy(sop->so_owner.data, owner->data, owner->len);
1036                         sop->so_owner.len = owner->len;
1037                         kref_init(&sop->so_ref);
1038                         return sop;
1039                 }
1040                 kmem_cache_free(stateowner_slab, sop);
1041         }
1042         return NULL;
1043 }
1044
1045 static struct nfs4_stateowner *
1046 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1047         struct nfs4_stateowner *sop;
1048         struct nfs4_replay *rp;
1049         unsigned int idhashval;
1050
1051         if (!(sop = alloc_stateowner(&open->op_owner)))
1052                 return NULL;
1053         idhashval = ownerid_hashval(current_ownerid);
1054         INIT_LIST_HEAD(&sop->so_idhash);
1055         INIT_LIST_HEAD(&sop->so_strhash);
1056         INIT_LIST_HEAD(&sop->so_perclient);
1057         INIT_LIST_HEAD(&sop->so_perfilestate);
1058         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
1059         INIT_LIST_HEAD(&sop->so_close_lru);
1060         sop->so_time = 0;
1061         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1062         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1063         list_add(&sop->so_perclient, &clp->cl_perclient);
1064         add_perclient++;
1065         sop->so_is_open_owner = 1;
1066         sop->so_id = current_ownerid++;
1067         sop->so_client = clp;
1068         sop->so_seqid = open->op_seqid;
1069         sop->so_confirmed = 0;
1070         rp = &sop->so_replay;
1071         rp->rp_status = NFSERR_SERVERFAULT;
1072         rp->rp_buflen = 0;
1073         rp->rp_buf = rp->rp_ibuf;
1074         return sop;
1075 }
1076
1077 static void
1078 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1079 {
1080         struct nfs4_stateowner *lock_sop;
1081
1082         while (!list_empty(&open_stp->st_perlockowner)) {
1083                 lock_sop = list_entry(open_stp->st_perlockowner.next,
1084                                 struct nfs4_stateowner, so_perlockowner);
1085                 /* list_del(&open_stp->st_perlockowner);  */
1086                 BUG_ON(lock_sop->so_is_open_owner);
1087                 release_stateowner(lock_sop);
1088         }
1089 }
1090
1091 static void
1092 unhash_stateowner(struct nfs4_stateowner *sop)
1093 {
1094         struct nfs4_stateid *stp;
1095
1096         list_del(&sop->so_idhash);
1097         list_del(&sop->so_strhash);
1098         if (sop->so_is_open_owner) {
1099                 list_del(&sop->so_perclient);
1100                 del_perclient++;
1101         }
1102         list_del(&sop->so_perlockowner);
1103         while (!list_empty(&sop->so_perfilestate)) {
1104                 stp = list_entry(sop->so_perfilestate.next,
1105                         struct nfs4_stateid, st_perfilestate);
1106                 if (sop->so_is_open_owner)
1107                         release_stateid(stp, OPEN_STATE);
1108                 else
1109                         release_stateid(stp, LOCK_STATE);
1110         }
1111 }
1112
1113 static void
1114 release_stateowner(struct nfs4_stateowner *sop)
1115 {
1116         unhash_stateowner(sop);
1117         list_del(&sop->so_close_lru);
1118         nfs4_put_stateowner(sop);
1119 }
1120
1121 static inline void
1122 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1123         struct nfs4_stateowner *sop = open->op_stateowner;
1124         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1125
1126         INIT_LIST_HEAD(&stp->st_hash);
1127         INIT_LIST_HEAD(&stp->st_perfilestate);
1128         INIT_LIST_HEAD(&stp->st_perlockowner);
1129         INIT_LIST_HEAD(&stp->st_perfile);
1130         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1131         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1132         list_add_perfile++;
1133         list_add(&stp->st_perfile, &fp->fi_perfile);
1134         stp->st_stateowner = sop;
1135         stp->st_file = fp;
1136         stp->st_stateid.si_boot = boot_time;
1137         stp->st_stateid.si_stateownerid = sop->so_id;
1138         stp->st_stateid.si_fileid = fp->fi_id;
1139         stp->st_stateid.si_generation = 0;
1140         stp->st_access_bmap = 0;
1141         stp->st_deny_bmap = 0;
1142         __set_bit(open->op_share_access, &stp->st_access_bmap);
1143         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1144 }
1145
1146 static void
1147 release_stateid(struct nfs4_stateid *stp, int flags)
1148 {
1149         struct file *filp = stp->st_vfs_file;
1150
1151         list_del(&stp->st_hash);
1152         list_del_perfile++;
1153         list_del(&stp->st_perfile);
1154         list_del(&stp->st_perfilestate);
1155         if (flags & OPEN_STATE) {
1156                 release_stateid_lockowners(stp);
1157                 stp->st_vfs_file = NULL;
1158                 nfsd_close(filp);
1159                 vfsclose++;
1160         } else if (flags & LOCK_STATE)
1161                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1162         kfree(stp);
1163         stp = NULL;
1164 }
1165
1166 static void
1167 release_file(struct nfs4_file *fp)
1168 {
1169         free_file++;
1170         list_del(&fp->fi_hash);
1171         iput(fp->fi_inode);
1172         kfree(fp);
1173 }
1174
1175 void
1176 move_to_close_lru(struct nfs4_stateowner *sop)
1177 {
1178         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1179
1180         unhash_stateowner(sop);
1181         list_add_tail(&sop->so_close_lru, &close_lru);
1182         sop->so_time = get_seconds();
1183 }
1184
1185 void
1186 release_state_owner(struct nfs4_stateid *stp, int flag)
1187 {
1188         struct nfs4_stateowner *sop = stp->st_stateowner;
1189         struct nfs4_file *fp = stp->st_file;
1190
1191         dprintk("NFSD: release_state_owner\n");
1192         release_stateid(stp, flag);
1193
1194         /* place unused nfs4_stateowners on so_close_lru list to be
1195          * released by the laundromat service after the lease period
1196          * to enable us to handle CLOSE replay
1197          */
1198         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1199                 move_to_close_lru(sop);
1200         /* unused nfs4_file's are releseed. XXX slab cache? */
1201         if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) {
1202                 release_file(fp);
1203         }
1204 }
1205
1206 static int
1207 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1208         return ((sop->so_owner.len == owner->len) &&
1209          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1210           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1211 }
1212
1213 static struct nfs4_stateowner *
1214 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1215 {
1216         struct nfs4_stateowner *so = NULL;
1217
1218         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1219                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1220                         return so;
1221         }
1222         return NULL;
1223 }
1224
1225 /* search file_hashtbl[] for file */
1226 static struct nfs4_file *
1227 find_file(struct inode *ino)
1228 {
1229         unsigned int hashval = file_hashval(ino);
1230         struct nfs4_file *fp;
1231
1232         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1233                 if (fp->fi_inode == ino)
1234                         return fp;
1235         }
1236         return NULL;
1237 }
1238
1239 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1240 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1241
1242 void
1243 set_access(unsigned int *access, unsigned long bmap) {
1244         int i;
1245
1246         *access = 0;
1247         for (i = 1; i < 4; i++) {
1248                 if (test_bit(i, &bmap))
1249                         *access |= i;
1250         }
1251 }
1252
1253 void
1254 set_deny(unsigned int *deny, unsigned long bmap) {
1255         int i;
1256
1257         *deny = 0;
1258         for (i = 0; i < 4; i++) {
1259                 if (test_bit(i, &bmap))
1260                         *deny |= i ;
1261         }
1262 }
1263
1264 static int
1265 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1266         unsigned int access, deny;
1267
1268         set_access(&access, stp->st_access_bmap);
1269         set_deny(&deny, stp->st_deny_bmap);
1270         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1271                 return 0;
1272         return 1;
1273 }
1274
1275 /*
1276  * Called to check deny when READ with all zero stateid or
1277  * WRITE with all zero or all one stateid
1278  */
1279 int
1280 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1281 {
1282         struct inode *ino = current_fh->fh_dentry->d_inode;
1283         struct nfs4_file *fp;
1284         struct nfs4_stateid *stp;
1285
1286         dprintk("NFSD: nfs4_share_conflict\n");
1287
1288         fp = find_file(ino);
1289         if (fp) {
1290         /* Search for conflicting share reservations */
1291                 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1292                         if (test_bit(deny_type, &stp->st_deny_bmap) ||
1293                             test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1294                                 return nfserr_share_denied;
1295                 }
1296         }
1297         return nfs_ok;
1298 }
1299
1300 static inline void
1301 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1302 {
1303         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1304                 put_write_access(filp->f_dentry->d_inode);
1305                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1306         }
1307 }
1308
1309 /*
1310  * Recall a delegation
1311  */
1312 static int
1313 do_recall(void *__dp)
1314 {
1315         struct nfs4_delegation *dp = __dp;
1316
1317         daemonize("nfsv4-recall");
1318
1319         nfsd4_cb_recall(dp);
1320         return 0;
1321 }
1322
1323 /*
1324  * Spawn a thread to perform a recall on the delegation represented
1325  * by the lease (file_lock)
1326  *
1327  * Called from break_lease() with lock_kernel() held.
1328  * Note: we assume break_lease will only call this *once* for any given
1329  * lease.
1330  */
1331 static
1332 void nfsd_break_deleg_cb(struct file_lock *fl)
1333 {
1334         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1335         struct task_struct *t;
1336
1337         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1338         if (!dp)
1339                 return;
1340
1341         /* We're assuming the state code never drops its reference
1342          * without first removing the lease.  Since we're in this lease
1343          * callback (and since the lease code is serialized by the kernel
1344          * lock) we know the server hasn't removed the lease yet, we know
1345          * it's safe to take a reference: */
1346         atomic_inc(&dp->dl_count);
1347
1348         spin_lock(&recall_lock);
1349         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1350         spin_unlock(&recall_lock);
1351
1352         /* only place dl_time is set. protected by lock_kernel*/
1353         dp->dl_time = get_seconds();
1354
1355         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1356         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1357
1358         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1359         if (IS_ERR(t)) {
1360                 struct nfs4_client *clp = dp->dl_client;
1361
1362                 printk(KERN_INFO "NFSD: Callback thread failed for "
1363                         "for client (clientid %08x/%08x)\n",
1364                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1365                 nfs4_put_delegation(dp);
1366         }
1367 }
1368
1369 /*
1370  * The file_lock is being reapd.
1371  *
1372  * Called by locks_free_lock() with lock_kernel() held.
1373  */
1374 static
1375 void nfsd_release_deleg_cb(struct file_lock *fl)
1376 {
1377         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1378
1379         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1380
1381         if (!(fl->fl_flags & FL_LEASE) || !dp)
1382                 return;
1383         dp->dl_flock = NULL;
1384 }
1385
1386 /*
1387  * Set the delegation file_lock back pointer.
1388  *
1389  * Called from __setlease() with lock_kernel() held.
1390  */
1391 static
1392 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1393 {
1394         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1395
1396         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1397         if (!dp)
1398                 return;
1399         dp->dl_flock = new;
1400 }
1401
1402 /*
1403  * Called from __setlease() with lock_kernel() held
1404  */
1405 static
1406 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1407 {
1408         struct nfs4_delegation *onlistd =
1409                 (struct nfs4_delegation *)onlist->fl_owner;
1410         struct nfs4_delegation *tryd =
1411                 (struct nfs4_delegation *)try->fl_owner;
1412
1413         if (onlist->fl_lmops != try->fl_lmops)
1414                 return 0;
1415
1416         return onlistd->dl_client == tryd->dl_client;
1417 }
1418
1419
1420 static
1421 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1422 {
1423         if (arg & F_UNLCK)
1424                 return lease_modify(onlist, arg);
1425         else
1426                 return -EAGAIN;
1427 }
1428
1429 struct lock_manager_operations nfsd_lease_mng_ops = {
1430         .fl_break = nfsd_break_deleg_cb,
1431         .fl_release_private = nfsd_release_deleg_cb,
1432         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1433         .fl_mylease = nfsd_same_client_deleg_cb,
1434         .fl_change = nfsd_change_deleg_cb,
1435 };
1436
1437
1438 /*
1439  * nfsd4_process_open1()
1440  *      lookup stateowner.
1441  *              found:
1442  *                      check confirmed
1443  *                              confirmed:
1444  *                                      check seqid
1445  *                              not confirmed:
1446  *                                      delete owner
1447  *                                      create new owner
1448  *              notfound:
1449  *                      verify clientid
1450  *                      create new owner
1451  *
1452  * called with nfs4_lock_state() held.
1453  */
1454 int
1455 nfsd4_process_open1(struct nfsd4_open *open)
1456 {
1457         int status;
1458         clientid_t *clientid = &open->op_clientid;
1459         struct nfs4_client *clp = NULL;
1460         unsigned int strhashval;
1461         struct nfs4_stateowner *sop = NULL;
1462
1463         status = nfserr_inval;
1464         if (!check_name(open->op_owner))
1465                 goto out;
1466
1467         if (STALE_CLIENTID(&open->op_clientid))
1468                 return nfserr_stale_clientid;
1469
1470         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1471         sop = find_openstateowner_str(strhashval, open);
1472         if (sop) {
1473                 open->op_stateowner = sop;
1474                 /* check for replay */
1475                 if (open->op_seqid == sop->so_seqid){
1476                         if (sop->so_replay.rp_buflen)
1477                                 return NFSERR_REPLAY_ME;
1478                         else {
1479                                 /* The original OPEN failed so spectacularly
1480                                  * that we don't even have replay data saved!
1481                                  * Therefore, we have no choice but to continue
1482                                  * processing this OPEN; presumably, we'll
1483                                  * fail again for the same reason.
1484                                  */
1485                                 dprintk("nfsd4_process_open1:"
1486                                         " replay with no replay cache\n");
1487                                 goto renew;
1488                         }
1489                 } else if (sop->so_confirmed) {
1490                         if (open->op_seqid == sop->so_seqid + 1)
1491                                 goto renew;
1492                         status = nfserr_bad_seqid;
1493                         goto out;
1494                 } else {
1495                         /* If we get here, we received an OPEN for an
1496                          * unconfirmed nfs4_stateowner. Since the seqid's are
1497                          * different, purge the existing nfs4_stateowner, and
1498                          * instantiate a new one.
1499                          */
1500                         clp = sop->so_client;
1501                         release_stateowner(sop);
1502                 }
1503         } else {
1504                 /* nfs4_stateowner not found.
1505                  * Verify clientid and instantiate new nfs4_stateowner.
1506                  * If verify fails this is presumably the result of the
1507                  * client's lease expiring.
1508                  */
1509                 status = nfserr_expired;
1510                 clp = find_confirmed_client(clientid);
1511                 if (clp == NULL)
1512                         goto out;
1513         }
1514         status = nfserr_resource;
1515         sop = alloc_init_open_stateowner(strhashval, clp, open);
1516         if (sop == NULL)
1517                 goto out;
1518         open->op_stateowner = sop;
1519 renew:
1520         status = nfs_ok;
1521         renew_client(sop->so_client);
1522 out:
1523         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1524                 status = nfserr_reclaim_bad;
1525         return status;
1526 }
1527
1528 static int
1529 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1530 {
1531         struct nfs4_stateid *local;
1532         int status = nfserr_share_denied;
1533         struct nfs4_stateowner *sop = open->op_stateowner;
1534
1535         list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
1536                 /* ignore lock owners */
1537                 if (local->st_stateowner->so_is_open_owner == 0)
1538                         continue;
1539                 /* remember if we have seen this open owner */
1540                 if (local->st_stateowner == sop)
1541                         *stpp = local;
1542                 /* check for conflicting share reservations */
1543                 if (!test_share(local, open))
1544                         goto out;
1545         }
1546         status = 0;
1547 out:
1548         return status;
1549 }
1550
1551 static int
1552 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1553                 struct svc_fh *cur_fh, int flags)
1554 {
1555         struct nfs4_stateid *stp;
1556         int status;
1557
1558         stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
1559         if (stp == NULL)
1560                 return nfserr_resource;
1561
1562         status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, &stp->st_vfs_file);
1563         if (status) {
1564                 if (status == nfserr_dropit)
1565                         status = nfserr_jukebox;
1566                 kfree(stp);
1567                 return status;
1568         }
1569         vfsopen++;
1570         *stpp = stp;
1571         return 0;
1572 }
1573
1574 static inline int
1575 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1576                 struct nfsd4_open *open)
1577 {
1578         struct iattr iattr = {
1579                 .ia_valid = ATTR_SIZE,
1580                 .ia_size = 0,
1581         };
1582         if (!open->op_truncate)
1583                 return 0;
1584         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1585                 return -EINVAL;
1586         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1587 }
1588
1589 static int
1590 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1591 {
1592         struct file *filp = stp->st_vfs_file;
1593         struct inode *inode = filp->f_dentry->d_inode;
1594         unsigned int share_access;
1595         int status;
1596
1597         set_access(&share_access, stp->st_access_bmap);
1598         share_access = ~share_access;
1599         share_access &= open->op_share_access;
1600
1601         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1602                 return nfsd4_truncate(rqstp, cur_fh, open);
1603
1604         status = get_write_access(inode);
1605         if (status)
1606                 return nfserrno(status);
1607         status = nfsd4_truncate(rqstp, cur_fh, open);
1608         if (status) {
1609                 put_write_access(inode);
1610                 return status;
1611         }
1612         /* remember the open */
1613         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1614         set_bit(open->op_share_access, &stp->st_access_bmap);
1615         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1616
1617         return nfs_ok;
1618 }
1619
1620
1621 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1622 static void
1623 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1624 {
1625         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1626                 if (*status)
1627                         *status = nfserr_reclaim_bad;
1628                 else {
1629                         open->op_stateowner->so_confirmed = 1;
1630                         open->op_stateowner->so_seqid--;
1631                 }
1632         }
1633 }
1634
1635 /*
1636  * Attempt to hand out a delegation.
1637  */
1638 static void
1639 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1640 {
1641         struct nfs4_delegation *dp;
1642         struct nfs4_stateowner *sop = stp->st_stateowner;
1643         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1644         struct file_lock fl, *flp = &fl;
1645         int status, flag = 0;
1646
1647         flag = NFS4_OPEN_DELEGATE_NONE;
1648         if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
1649              || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
1650                 goto out;
1651
1652         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1653                 flag = NFS4_OPEN_DELEGATE_WRITE;
1654         else
1655                 flag = NFS4_OPEN_DELEGATE_READ;
1656
1657         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1658         if (dp == NULL) {
1659                 flag = NFS4_OPEN_DELEGATE_NONE;
1660                 goto out;
1661         }
1662         locks_init_lock(&fl);
1663         fl.fl_lmops = &nfsd_lease_mng_ops;
1664         fl.fl_flags = FL_LEASE;
1665         fl.fl_end = OFFSET_MAX;
1666         fl.fl_owner =  (fl_owner_t)dp;
1667         fl.fl_file = stp->st_vfs_file;
1668         fl.fl_pid = current->tgid;
1669
1670         /* setlease checks to see if delegation should be handed out.
1671          * the lock_manager callbacks fl_mylease and fl_change are used
1672          */
1673         if ((status = setlease(stp->st_vfs_file,
1674                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1675                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1676                 list_del(&dp->dl_del_perfile);
1677                 list_del(&dp->dl_del_perclnt);
1678                 nfs4_put_delegation(dp);
1679                 free_delegation++;
1680                 flag = NFS4_OPEN_DELEGATE_NONE;
1681                 goto out;
1682         }
1683
1684         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1685
1686         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1687                      dp->dl_stateid.si_boot,
1688                      dp->dl_stateid.si_stateownerid,
1689                      dp->dl_stateid.si_fileid,
1690                      dp->dl_stateid.si_generation);
1691 out:
1692         open->op_delegate_type = flag;
1693 }
1694
1695 /*
1696  * called with nfs4_lock_state() held.
1697  */
1698 int
1699 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1700 {
1701         struct nfs4_file *fp = NULL;
1702         struct inode *ino = current_fh->fh_dentry->d_inode;
1703         struct nfs4_stateid *stp = NULL;
1704         int status;
1705
1706         status = nfserr_inval;
1707         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1708                 goto out;
1709         /*
1710          * Lookup file; if found, lookup stateid and check open request,
1711          * and check for delegations in the process of being recalled.
1712          * If not found, create the nfs4_file struct
1713          */
1714         fp = find_file(ino);
1715         if (fp) {
1716                 if ((status = nfs4_check_open(fp, open, &stp)))
1717                         goto out;
1718         } else {
1719                 status = nfserr_resource;
1720                 fp = alloc_init_file(ino);
1721                 if (fp == NULL)
1722                         goto out;
1723         }
1724
1725         /*
1726          * OPEN the file, or upgrade an existing OPEN.
1727          * If truncate fails, the OPEN fails.
1728          */
1729         if (stp) {
1730                 /* Stateid was found, this is an OPEN upgrade */
1731                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1732                 if (status)
1733                         goto out;
1734         } else {
1735                 /* Stateid was not found, this is a new OPEN */
1736                 int flags = 0;
1737                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1738                         flags = MAY_WRITE;
1739                 else
1740                         flags = MAY_READ;
1741                 if ((status = nfs4_new_open(rqstp, &stp, current_fh, flags)))
1742                         goto out;
1743                 init_stateid(stp, fp, open);
1744                 status = nfsd4_truncate(rqstp, current_fh, open);
1745                 if (status) {
1746                         release_stateid(stp, OPEN_STATE);
1747                         goto out;
1748                 }
1749         }
1750         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1751
1752         /*
1753         * Attempt to hand out a delegation. No error return, because the
1754         * OPEN succeeds even if we fail.
1755         */
1756         nfs4_open_delegation(current_fh, open, stp);
1757
1758         status = nfs_ok;
1759
1760         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1761                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1762                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1763 out:
1764         /* take the opportunity to clean up unused state */
1765         if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
1766                 release_file(fp);
1767
1768         /* CLAIM_PREVIOUS has different error returns */
1769         nfs4_set_claim_prev(open, &status);
1770         /*
1771         * To finish the open response, we just need to set the rflags.
1772         */
1773         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1774         if (!open->op_stateowner->so_confirmed)
1775                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1776
1777         return status;
1778 }
1779
1780 static struct work_struct laundromat_work;
1781 static void laundromat_main(void *);
1782 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1783
1784 int
1785 nfsd4_renew(clientid_t *clid)
1786 {
1787         struct nfs4_client *clp;
1788         int status;
1789
1790         nfs4_lock_state();
1791         dprintk("process_renew(%08x/%08x): starting\n",
1792                         clid->cl_boot, clid->cl_id);
1793         status = nfserr_stale_clientid;
1794         if (STALE_CLIENTID(clid))
1795                 goto out;
1796         clp = find_confirmed_client(clid);
1797         status = nfserr_expired;
1798         if (clp == NULL) {
1799                 /* We assume the client took too long to RENEW. */
1800                 dprintk("nfsd4_renew: clientid not found!\n");
1801                 goto out;
1802         }
1803         renew_client(clp);
1804         status = nfserr_cb_path_down;
1805         if (!list_empty(&clp->cl_del_perclnt)
1806                         && !atomic_read(&clp->cl_callback.cb_set))
1807                 goto out;
1808         status = nfs_ok;
1809 out:
1810         nfs4_unlock_state();
1811         return status;
1812 }
1813
1814 time_t
1815 nfs4_laundromat(void)
1816 {
1817         struct nfs4_client *clp;
1818         struct nfs4_stateowner *sop;
1819         struct nfs4_delegation *dp;
1820         struct list_head *pos, *next, reaplist;
1821         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1822         time_t t, clientid_val = NFSD_LEASE_TIME;
1823         time_t u, test_val = NFSD_LEASE_TIME;
1824
1825         nfs4_lock_state();
1826
1827         dprintk("NFSD: laundromat service - starting\n");
1828         list_for_each_safe(pos, next, &client_lru) {
1829                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1830                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1831                         t = clp->cl_time - cutoff;
1832                         if (clientid_val > t)
1833                                 clientid_val = t;
1834                         break;
1835                 }
1836                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1837                         clp->cl_clientid.cl_id);
1838                 expire_client(clp);
1839         }
1840         INIT_LIST_HEAD(&reaplist);
1841         spin_lock(&recall_lock);
1842         list_for_each_safe(pos, next, &del_recall_lru) {
1843                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1844                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1845                         u = dp->dl_time - cutoff;
1846                         if (test_val > u)
1847                                 test_val = u;
1848                         break;
1849                 }
1850                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1851                                     dp, dp->dl_flock);
1852                 list_move(&dp->dl_recall_lru, &reaplist);
1853         }
1854         spin_unlock(&recall_lock);
1855         list_for_each_safe(pos, next, &reaplist) {
1856                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1857                 list_del_init(&dp->dl_recall_lru);
1858                 unhash_delegation(dp);
1859         }
1860         test_val = NFSD_LEASE_TIME;
1861         list_for_each_safe(pos, next, &close_lru) {
1862                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1863                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1864                         u = sop->so_time - cutoff;
1865                         if (test_val > u)
1866                                 test_val = u;
1867                         break;
1868                 }
1869                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1870                         sop->so_id);
1871                 list_del(&sop->so_close_lru);
1872                 nfs4_put_stateowner(sop);
1873         }
1874         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1875                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1876         nfs4_unlock_state();
1877         return clientid_val;
1878 }
1879
1880 void
1881 laundromat_main(void *not_used)
1882 {
1883         time_t t;
1884
1885         t = nfs4_laundromat();
1886         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1887         schedule_delayed_work(&laundromat_work, t*HZ);
1888 }
1889
1890 /* search ownerid_hashtbl[] and close_lru for stateid owner
1891  * (stateid->si_stateownerid)
1892  */
1893 struct nfs4_stateowner *
1894 find_openstateowner_id(u32 st_id, int flags) {
1895         struct nfs4_stateowner *local = NULL;
1896
1897         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1898         if (flags & CLOSE_STATE) {
1899                 list_for_each_entry(local, &close_lru, so_close_lru) {
1900                         if (local->so_id == st_id)
1901                                 return local;
1902                 }
1903         }
1904         return NULL;
1905 }
1906
1907 static inline int
1908 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1909 {
1910         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1911 }
1912
1913 static int
1914 STALE_STATEID(stateid_t *stateid)
1915 {
1916         if (stateid->si_boot == boot_time)
1917                 return 0;
1918         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1919                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1920                 stateid->si_generation);
1921         return 1;
1922 }
1923
1924 static inline int
1925 access_permit_read(unsigned long access_bmap)
1926 {
1927         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1928                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1929                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1930 }
1931
1932 static inline int
1933 access_permit_write(unsigned long access_bmap)
1934 {
1935         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1936                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1937 }
1938
1939 static
1940 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1941 {
1942         int status = nfserr_openmode;
1943
1944         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1945                 goto out;
1946         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1947                 goto out;
1948         status = nfs_ok;
1949 out:
1950         return status;
1951 }
1952
1953 static inline int
1954 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1955 {
1956         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1957                 return nfserr_openmode;
1958         else
1959                 return nfs_ok;
1960 }
1961
1962 static inline int
1963 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1964 {
1965         /* Trying to call delegreturn with a special stateid? Yuch: */
1966         if (!(flags & (RD_STATE | WR_STATE)))
1967                 return nfserr_bad_stateid;
1968         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1969                 return nfs_ok;
1970         else if (nfs4_in_grace()) {
1971                 /* Answer in remaining cases depends on existance of
1972                  * conflicting state; so we must wait out the grace period. */
1973                 return nfserr_grace;
1974         } else if (flags & WR_STATE)
1975                 return nfs4_share_conflict(current_fh,
1976                                 NFS4_SHARE_DENY_WRITE);
1977         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1978                 return nfs4_share_conflict(current_fh,
1979                                 NFS4_SHARE_DENY_READ);
1980 }
1981
1982 /*
1983  * Allow READ/WRITE during grace period on recovered state only for files
1984  * that are not able to provide mandatory locking.
1985  */
1986 static inline int
1987 io_during_grace_disallowed(struct inode *inode, int flags)
1988 {
1989         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
1990                 && MANDATORY_LOCK(inode);
1991 }
1992
1993 /*
1994 * Checks for stateid operations
1995 */
1996 int
1997 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1998 {
1999         struct nfs4_stateid *stp = NULL;
2000         struct nfs4_delegation *dp = NULL;
2001         stateid_t *stidp;
2002         struct inode *ino = current_fh->fh_dentry->d_inode;
2003         int status;
2004
2005         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2006                 stateid->si_boot, stateid->si_stateownerid,
2007                 stateid->si_fileid, stateid->si_generation);
2008         if (filpp)
2009                 *filpp = NULL;
2010
2011         if (io_during_grace_disallowed(ino, flags))
2012                 return nfserr_grace;
2013
2014         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2015                 return check_special_stateids(current_fh, stateid, flags);
2016
2017         /* STALE STATEID */
2018         status = nfserr_stale_stateid;
2019         if (STALE_STATEID(stateid))
2020                 goto out;
2021
2022         /* BAD STATEID */
2023         status = nfserr_bad_stateid;
2024         if (!stateid->si_fileid) { /* delegation stateid */
2025                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2026                         dprintk("NFSD: delegation stateid not found\n");
2027                         if (nfs4_in_grace())
2028                                 status = nfserr_grace;
2029                         goto out;
2030                 }
2031                 stidp = &dp->dl_stateid;
2032         } else { /* open or lock stateid */
2033                 if (!(stp = find_stateid(stateid, flags))) {
2034                         dprintk("NFSD: open or lock stateid not found\n");
2035                         if (nfs4_in_grace())
2036                                 status = nfserr_grace;
2037                         goto out;
2038                 }
2039                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2040                         goto out;
2041                 if (!stp->st_stateowner->so_confirmed)
2042                         goto out;
2043                 stidp = &stp->st_stateid;
2044         }
2045         if (stateid->si_generation > stidp->si_generation)
2046                 goto out;
2047
2048         /* OLD STATEID */
2049         status = nfserr_old_stateid;
2050         if (stateid->si_generation < stidp->si_generation)
2051                 goto out;
2052         if (stp) {
2053                 if ((status = nfs4_check_openmode(stp,flags)))
2054                         goto out;
2055                 renew_client(stp->st_stateowner->so_client);
2056                 if (filpp)
2057                         *filpp = stp->st_vfs_file;
2058         } else if (dp) {
2059                 if ((status = nfs4_check_delegmode(dp, flags)))
2060                         goto out;
2061                 renew_client(dp->dl_client);
2062                 if (flags & DELEG_RET)
2063                         unhash_delegation(dp);
2064                 if (filpp)
2065                         *filpp = dp->dl_vfs_file;
2066         }
2067         status = nfs_ok;
2068 out:
2069         return status;
2070 }
2071
2072
2073 /*
2074  * Checks for sequence id mutating operations.
2075  */
2076 int
2077 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)
2078 {
2079         int status;
2080         struct nfs4_stateid *stp;
2081         struct nfs4_stateowner *sop;
2082
2083         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2084                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2085                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2086                 stateid->si_generation);
2087
2088         *stpp = NULL;
2089         *sopp = NULL;
2090
2091         status = nfserr_bad_stateid;
2092         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2093                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2094                 goto out;
2095         }
2096
2097         status = nfserr_stale_stateid;
2098         if (STALE_STATEID(stateid))
2099                 goto out;
2100         /*
2101         * We return BAD_STATEID if filehandle doesn't match stateid,
2102         * the confirmed flag is incorrecly set, or the generation
2103         * number is incorrect.
2104         * If there is no entry in the openfile table for this id,
2105         * we can't always return BAD_STATEID;
2106         * this might be a retransmitted CLOSE which has arrived after
2107         * the openfile has been released.
2108         */
2109         if (!(stp = find_stateid(stateid, flags)))
2110                 goto no_nfs4_stateid;
2111
2112         status = nfserr_bad_stateid;
2113
2114         /* for new lock stateowners:
2115          * check that the lock->v.new.open_stateid
2116          * refers to an open stateowner
2117          *
2118          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2119          * as the open_stateid->st_stateowner->so_client->clientid
2120          */
2121         if (lockclid) {
2122                 struct nfs4_stateowner *sop = stp->st_stateowner;
2123                 struct nfs4_client *clp = sop->so_client;
2124
2125                 if (!sop->so_is_open_owner)
2126                         goto out;
2127                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2128                         goto out;
2129         }
2130
2131         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2132                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2133                 goto out;
2134         }
2135
2136         *stpp = stp;
2137         *sopp = sop = stp->st_stateowner;
2138
2139         /*
2140         *  We now validate the seqid and stateid generation numbers.
2141         *  For the moment, we ignore the possibility of
2142         *  generation number wraparound.
2143         */
2144         if (seqid != sop->so_seqid + 1)
2145                 goto check_replay;
2146
2147         if (sop->so_confirmed) {
2148                 if (flags & CONFIRM) {
2149                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2150                         goto out;
2151                 }
2152         }
2153         else {
2154                 if (!(flags & CONFIRM)) {
2155                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2156                         goto out;
2157                 }
2158         }
2159         if (stateid->si_generation > stp->st_stateid.si_generation) {
2160                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2161                 goto out;
2162         }
2163
2164         status = nfserr_old_stateid;
2165         if (stateid->si_generation < stp->st_stateid.si_generation) {
2166                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2167                 goto out;
2168         }
2169         /* XXX renew the client lease here */
2170         status = nfs_ok;
2171
2172 out:
2173         return status;
2174
2175 no_nfs4_stateid:
2176
2177         /*
2178         * We determine whether this is a bad stateid or a replay,
2179         * starting by trying to look up the stateowner.
2180         * If stateowner is not found - stateid is bad.
2181         */
2182         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2183                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2184                 status = nfserr_bad_stateid;
2185                 goto out;
2186         }
2187         *sopp = sop;
2188
2189 check_replay:
2190         if (seqid == sop->so_seqid) {
2191                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2192                 /* indicate replay to calling function */
2193                 status = NFSERR_REPLAY_ME;
2194         } else  {
2195                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2196
2197                 *sopp = NULL;
2198                 status = nfserr_bad_seqid;
2199         }
2200         goto out;
2201 }
2202
2203 int
2204 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2205 {
2206         int status;
2207         struct nfs4_stateowner *sop;
2208         struct nfs4_stateid *stp;
2209
2210         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2211                         (int)current_fh->fh_dentry->d_name.len,
2212                         current_fh->fh_dentry->d_name.name);
2213
2214         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2215                 goto out;
2216
2217         nfs4_lock_state();
2218
2219         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2220                                         &oc->oc_req_stateid,
2221                                         CHECK_FH | CONFIRM | OPEN_STATE,
2222                                         &oc->oc_stateowner, &stp, NULL)))
2223                 goto out;
2224
2225         sop = oc->oc_stateowner;
2226         sop->so_confirmed = 1;
2227         update_stateid(&stp->st_stateid);
2228         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2229         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2230                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2231                          stp->st_stateid.si_boot,
2232                          stp->st_stateid.si_stateownerid,
2233                          stp->st_stateid.si_fileid,
2234                          stp->st_stateid.si_generation);
2235 out:
2236         if (oc->oc_stateowner)
2237                 nfs4_get_stateowner(oc->oc_stateowner);
2238         nfs4_unlock_state();
2239         return status;
2240 }
2241
2242
2243 /*
2244  * unset all bits in union bitmap (bmap) that
2245  * do not exist in share (from successful OPEN_DOWNGRADE)
2246  */
2247 static void
2248 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2249 {
2250         int i;
2251         for (i = 1; i < 4; i++) {
2252                 if ((i & access) != i)
2253                         __clear_bit(i, bmap);
2254         }
2255 }
2256
2257 static void
2258 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2259 {
2260         int i;
2261         for (i = 0; i < 4; i++) {
2262                 if ((i & deny) != i)
2263                         __clear_bit(i, bmap);
2264         }
2265 }
2266
2267 int
2268 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2269 {
2270         int status;
2271         struct nfs4_stateid *stp;
2272         unsigned int share_access;
2273
2274         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2275                         (int)current_fh->fh_dentry->d_name.len,
2276                         current_fh->fh_dentry->d_name.name);
2277
2278         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2279                 return nfserr_inval;
2280
2281         nfs4_lock_state();
2282         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2283                                         &od->od_stateid,
2284                                         CHECK_FH | OPEN_STATE,
2285                                         &od->od_stateowner, &stp, NULL)))
2286                 goto out;
2287
2288         status = nfserr_inval;
2289         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2290                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2291                         stp->st_access_bmap, od->od_share_access);
2292                 goto out;
2293         }
2294         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2295                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2296                         stp->st_deny_bmap, od->od_share_deny);
2297                 goto out;
2298         }
2299         set_access(&share_access, stp->st_access_bmap);
2300         nfs4_file_downgrade(stp->st_vfs_file,
2301                             share_access & ~od->od_share_access);
2302
2303         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2304         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2305
2306         update_stateid(&stp->st_stateid);
2307         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2308         status = nfs_ok;
2309 out:
2310         if (od->od_stateowner)
2311                 nfs4_get_stateowner(od->od_stateowner);
2312         nfs4_unlock_state();
2313         return status;
2314 }
2315
2316 /*
2317  * nfs4_unlock_state() called after encode
2318  */
2319 int
2320 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2321 {
2322         int status;
2323         struct nfs4_stateid *stp;
2324
2325         dprintk("NFSD: nfsd4_close on file %.*s\n",
2326                         (int)current_fh->fh_dentry->d_name.len,
2327                         current_fh->fh_dentry->d_name.name);
2328
2329         nfs4_lock_state();
2330         /* check close_lru for replay */
2331         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2332                                         &close->cl_stateid,
2333                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2334                                         &close->cl_stateowner, &stp, NULL)))
2335                 goto out;
2336         /*
2337         *  Return success, but first update the stateid.
2338         */
2339         status = nfs_ok;
2340         update_stateid(&stp->st_stateid);
2341         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2342
2343         /* release_state_owner() calls nfsd_close() if needed */
2344         release_state_owner(stp, OPEN_STATE);
2345 out:
2346         if (close->cl_stateowner)
2347                 nfs4_get_stateowner(close->cl_stateowner);
2348         nfs4_unlock_state();
2349         return status;
2350 }
2351
2352 int
2353 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2354 {
2355         int status;
2356
2357         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2358                 goto out;
2359
2360         nfs4_lock_state();
2361         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2362         nfs4_unlock_state();
2363 out:
2364         return status;
2365 }
2366
2367
2368 /*
2369  * Lock owner state (byte-range locks)
2370  */
2371 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2372 #define LOCK_HASH_BITS              8
2373 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2374 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2375
2376 #define lockownerid_hashval(id) \
2377         ((id) & LOCK_HASH_MASK)
2378
2379 static inline unsigned int
2380 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2381                 struct xdr_netobj *ownername)
2382 {
2383         return (file_hashval(inode) + cl_id
2384                         + opaque_hashval(ownername->data, ownername->len))
2385                 & LOCK_HASH_MASK;
2386 }
2387
2388 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2389 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2390 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2391
2392 struct nfs4_stateid *
2393 find_stateid(stateid_t *stid, int flags)
2394 {
2395         struct nfs4_stateid *local = NULL;
2396         u32 st_id = stid->si_stateownerid;
2397         u32 f_id = stid->si_fileid;
2398         unsigned int hashval;
2399
2400         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2401         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2402                 hashval = stateid_hashval(st_id, f_id);
2403                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2404                         if ((local->st_stateid.si_stateownerid == st_id) &&
2405                             (local->st_stateid.si_fileid == f_id))
2406                                 return local;
2407                 }
2408         }
2409         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2410                 hashval = stateid_hashval(st_id, f_id);
2411                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2412                         if ((local->st_stateid.si_stateownerid == st_id) &&
2413                             (local->st_stateid.si_fileid == f_id))
2414                                 return local;
2415                 }
2416         } else
2417                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2418         return NULL;
2419 }
2420
2421 static struct nfs4_delegation *
2422 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2423 {
2424         struct nfs4_delegation *dp = NULL;
2425         struct nfs4_file *fp = NULL;
2426         u32 st_id;
2427
2428         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2429                     stid->si_boot, stid->si_stateownerid,
2430                     stid->si_fileid, stid->si_generation);
2431
2432         st_id = stid->si_stateownerid;
2433         fp = find_file(ino);
2434         if (fp) {
2435                 list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
2436                         if(dp->dl_stateid.si_stateownerid == st_id) {
2437                                 dprintk("NFSD: find_delegation dp %p\n",dp);
2438                                 return dp;
2439                         }
2440                 }
2441         }
2442         return NULL;
2443 }
2444
2445 /*
2446  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2447  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2448  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2449  * locking, this prevents us from being completely protocol-compliant.  The
2450  * real solution to this problem is to start using unsigned file offsets in
2451  * the VFS, but this is a very deep change!
2452  */
2453 static inline void
2454 nfs4_transform_lock_offset(struct file_lock *lock)
2455 {
2456         if (lock->fl_start < 0)
2457                 lock->fl_start = OFFSET_MAX;
2458         if (lock->fl_end < 0)
2459                 lock->fl_end = OFFSET_MAX;
2460 }
2461
2462 int
2463 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2464 {
2465         struct nfs4_stateowner *local = NULL;
2466         int status = 0;
2467
2468         if (hashval >= LOCK_HASH_SIZE)
2469                 goto out;
2470         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2471                 if (local == sop) {
2472                         status = 1;
2473                         goto out;
2474                 }
2475         }
2476 out:
2477         return status;
2478 }
2479
2480
2481 static inline void
2482 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2483 {
2484         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2485         unsigned int hval = lockownerid_hashval(sop->so_id);
2486
2487         deny->ld_sop = NULL;
2488         if (nfs4_verify_lock_stateowner(sop, hval)) {
2489                 kref_get(&sop->so_ref);
2490                 deny->ld_sop = sop;
2491                 deny->ld_clientid = sop->so_client->cl_clientid;
2492         }
2493         deny->ld_start = fl->fl_start;
2494         deny->ld_length = ~(u64)0;
2495         if (fl->fl_end != ~(u64)0)
2496                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2497         deny->ld_type = NFS4_READ_LT;
2498         if (fl->fl_type != F_RDLCK)
2499                 deny->ld_type = NFS4_WRITE_LT;
2500 }
2501
2502 static struct nfs4_stateowner *
2503 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2504 {
2505         struct nfs4_stateowner *local = NULL;
2506         int i;
2507
2508         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2509                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2510                         if (!cmp_owner_str(local, owner, clid))
2511                                 continue;
2512                         return local;
2513                 }
2514         }
2515         return NULL;
2516 }
2517
2518 static struct nfs4_stateowner *
2519 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2520                 struct xdr_netobj *owner)
2521 {
2522         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2523         struct nfs4_stateowner *op;
2524
2525         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2526                 if (cmp_owner_str(op, owner, clid))
2527                         return op;
2528         }
2529         return NULL;
2530 }
2531
2532 /*
2533  * Alloc a lock owner structure.
2534  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2535  * occured.
2536  *
2537  * strhashval = lock_ownerstr_hashval
2538  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2539  */
2540
2541 static struct nfs4_stateowner *
2542 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2543         struct nfs4_stateowner *sop;
2544         struct nfs4_replay *rp;
2545         unsigned int idhashval;
2546
2547         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2548                 return NULL;
2549         idhashval = lockownerid_hashval(current_ownerid);
2550         INIT_LIST_HEAD(&sop->so_idhash);
2551         INIT_LIST_HEAD(&sop->so_strhash);
2552         INIT_LIST_HEAD(&sop->so_perclient);
2553         INIT_LIST_HEAD(&sop->so_perfilestate);
2554         INIT_LIST_HEAD(&sop->so_perlockowner);
2555         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2556         sop->so_time = 0;
2557         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2558         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2559         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2560         sop->so_is_open_owner = 0;
2561         sop->so_id = current_ownerid++;
2562         sop->so_client = clp;
2563         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2564         sop->so_confirmed = 1;
2565         rp = &sop->so_replay;
2566         rp->rp_status = NFSERR_SERVERFAULT;
2567         rp->rp_buflen = 0;
2568         rp->rp_buf = rp->rp_ibuf;
2569         return sop;
2570 }
2571
2572 struct nfs4_stateid *
2573 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2574 {
2575         struct nfs4_stateid *stp;
2576         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2577
2578         if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2579                                         GFP_KERNEL)) == NULL)
2580                 goto out;
2581         INIT_LIST_HEAD(&stp->st_hash);
2582         INIT_LIST_HEAD(&stp->st_perfile);
2583         INIT_LIST_HEAD(&stp->st_perfilestate);
2584         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2585         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2586         list_add(&stp->st_perfile, &fp->fi_perfile);
2587         list_add_perfile++;
2588         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2589         stp->st_stateowner = sop;
2590         stp->st_file = fp;
2591         stp->st_stateid.si_boot = boot_time;
2592         stp->st_stateid.si_stateownerid = sop->so_id;
2593         stp->st_stateid.si_fileid = fp->fi_id;
2594         stp->st_stateid.si_generation = 0;
2595         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2596         stp->st_access_bmap = open_stp->st_access_bmap;
2597         stp->st_deny_bmap = open_stp->st_deny_bmap;
2598
2599 out:
2600         return stp;
2601 }
2602
2603 int
2604 check_lock_length(u64 offset, u64 length)
2605 {
2606         return ((length == 0)  || ((length != ~(u64)0) &&
2607              LOFF_OVERFLOW(offset, length)));
2608 }
2609
2610 /*
2611  *  LOCK operation
2612  */
2613 int
2614 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2615 {
2616         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2617         struct nfs4_stateid *lock_stp;
2618         struct file *filp;
2619         struct file_lock file_lock;
2620         struct file_lock *conflock;
2621         int status = 0;
2622         unsigned int strhashval;
2623
2624         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2625                 (long long) lock->lk_offset,
2626                 (long long) lock->lk_length);
2627
2628         if (nfs4_in_grace() && !lock->lk_reclaim)
2629                 return nfserr_grace;
2630         if (!nfs4_in_grace() && lock->lk_reclaim)
2631                 return nfserr_no_grace;
2632
2633         if (check_lock_length(lock->lk_offset, lock->lk_length))
2634                  return nfserr_inval;
2635
2636         nfs4_lock_state();
2637
2638         if (lock->lk_is_new) {
2639         /*
2640          * Client indicates that this is a new lockowner.
2641          * Use open owner and open stateid to create lock owner and lock
2642          * stateid.
2643          */
2644                 struct nfs4_stateid *open_stp = NULL;
2645                 struct nfs4_file *fp;
2646
2647                 status = nfserr_stale_clientid;
2648                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2649                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2650                         goto out;
2651                 }
2652
2653                 /* is the new lock seqid presented by the client zero? */
2654                 status = nfserr_bad_seqid;
2655                 if (lock->v.new.lock_seqid != 0)
2656                         goto out;
2657
2658                 /* validate and update open stateid and open seqid */
2659                 status = nfs4_preprocess_seqid_op(current_fh,
2660                                         lock->lk_new_open_seqid,
2661                                         &lock->lk_new_open_stateid,
2662                                         CHECK_FH | OPEN_STATE,
2663                                         &open_sop, &open_stp,
2664                                         &lock->v.new.clientid);
2665                 if (status) {
2666                         if (lock->lk_reclaim)
2667                                 status = nfserr_reclaim_bad;
2668                         goto out;
2669                 }
2670                 /* create lockowner and lock stateid */
2671                 fp = open_stp->st_file;
2672                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2673                                 open_sop->so_client->cl_clientid.cl_id,
2674                                 &lock->v.new.owner);
2675                 /*
2676                  * If we already have this lock owner, the client is in
2677                  * error (or our bookeeping is wrong!)
2678                  * for asking for a 'new lock'.
2679                  */
2680                 status = nfserr_bad_stateid;
2681                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2682                                                 &lock->v.new.clientid);
2683                 if (lock_sop)
2684                         goto out;
2685                 status = nfserr_resource;
2686                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2687                         goto out;
2688                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2689                                                 fp, open_stp)) == NULL) {
2690                         release_stateowner(lock->lk_stateowner);
2691                         lock->lk_stateowner = NULL;
2692                         goto out;
2693                 }
2694                 /* bump the open seqid used to create the lock */
2695                 open_sop->so_seqid++;
2696         } else {
2697                 /* lock (lock owner + lock stateid) already exists */
2698                 status = nfs4_preprocess_seqid_op(current_fh,
2699                                        lock->lk_old_lock_seqid,
2700                                        &lock->lk_old_lock_stateid,
2701                                        CHECK_FH | LOCK_STATE,
2702                                        &lock->lk_stateowner, &lock_stp, NULL);
2703                 if (status)
2704                         goto out;
2705         }
2706         /* lock->lk_stateowner and lock_stp have been created or found */
2707         filp = lock_stp->st_vfs_file;
2708
2709         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2710                 printk("NFSD: nfsd4_lock: permission denied!\n");
2711                 goto out;
2712         }
2713
2714         locks_init_lock(&file_lock);
2715         switch (lock->lk_type) {
2716                 case NFS4_READ_LT:
2717                 case NFS4_READW_LT:
2718                         file_lock.fl_type = F_RDLCK;
2719                 break;
2720                 case NFS4_WRITE_LT:
2721                 case NFS4_WRITEW_LT:
2722                         file_lock.fl_type = F_WRLCK;
2723                 break;
2724                 default:
2725                         status = nfserr_inval;
2726                 goto out;
2727         }
2728         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2729         file_lock.fl_pid = current->tgid;
2730         file_lock.fl_file = filp;
2731         file_lock.fl_flags = FL_POSIX;
2732
2733         file_lock.fl_start = lock->lk_offset;
2734         if ((lock->lk_length == ~(u64)0) ||
2735                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2736                 file_lock.fl_end = ~(u64)0;
2737         else
2738                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2739         nfs4_transform_lock_offset(&file_lock);
2740
2741         /*
2742         * Try to lock the file in the VFS.
2743         * Note: locks.c uses the BKL to protect the inode's lock list.
2744         */
2745
2746         status = posix_lock_file(filp, &file_lock);
2747         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2748                 file_lock.fl_ops->fl_release_private(&file_lock);
2749         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2750         switch (-status) {
2751         case 0: /* success! */
2752                 update_stateid(&lock_stp->st_stateid);
2753                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2754                                 sizeof(stateid_t));
2755                 goto out;
2756         case (EAGAIN):
2757                 goto conflicting_lock;
2758         case (EDEADLK):
2759                 status = nfserr_deadlock;
2760         default:
2761                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2762                 goto out_destroy_new_stateid;
2763         }
2764
2765 conflicting_lock:
2766         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2767         status = nfserr_denied;
2768         /* XXX There is a race here. Future patch needed to provide
2769          * an atomic posix_lock_and_test_file
2770          */
2771         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2772                 status = nfserr_serverfault;
2773                 goto out;
2774         }
2775         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2776
2777 out_destroy_new_stateid:
2778         if (lock->lk_is_new) {
2779                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2780         /*
2781         * An error encountered after instantiation of the new
2782         * stateid has forced us to destroy it.
2783         */
2784                 if (!seqid_mutating_err(status))
2785                         open_sop->so_seqid--;
2786
2787                 release_state_owner(lock_stp, LOCK_STATE);
2788         }
2789 out:
2790         if (lock->lk_stateowner)
2791                 nfs4_get_stateowner(lock->lk_stateowner);
2792         nfs4_unlock_state();
2793         return status;
2794 }
2795
2796 /*
2797  * LOCKT operation
2798  */
2799 int
2800 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2801 {
2802         struct inode *inode;
2803         struct file file;
2804         struct file_lock file_lock;
2805         struct file_lock *conflicting_lock;
2806         int status;
2807
2808         if (nfs4_in_grace())
2809                 return nfserr_grace;
2810
2811         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2812                  return nfserr_inval;
2813
2814         lockt->lt_stateowner = NULL;
2815         nfs4_lock_state();
2816
2817         status = nfserr_stale_clientid;
2818         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2819                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2820                 goto out;
2821         }
2822
2823         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2824                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2825                 if (status == nfserr_symlink)
2826                         status = nfserr_inval;
2827                 goto out;
2828         }
2829
2830         inode = current_fh->fh_dentry->d_inode;
2831         locks_init_lock(&file_lock);
2832         switch (lockt->lt_type) {
2833                 case NFS4_READ_LT:
2834                 case NFS4_READW_LT:
2835                         file_lock.fl_type = F_RDLCK;
2836                 break;
2837                 case NFS4_WRITE_LT:
2838                 case NFS4_WRITEW_LT:
2839                         file_lock.fl_type = F_WRLCK;
2840                 break;
2841                 default:
2842                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2843                         status = nfserr_inval;
2844                 goto out;
2845         }
2846
2847         lockt->lt_stateowner = find_lockstateowner_str(inode,
2848                         &lockt->lt_clientid, &lockt->lt_owner);
2849         if (lockt->lt_stateowner)
2850                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2851         file_lock.fl_pid = current->tgid;
2852         file_lock.fl_flags = FL_POSIX;
2853
2854         file_lock.fl_start = lockt->lt_offset;
2855         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2856                 file_lock.fl_end = ~(u64)0;
2857         else
2858                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2859
2860         nfs4_transform_lock_offset(&file_lock);
2861
2862         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2863          * since LOCKT doesn't require an OPEN, and therefore a struct
2864          * file may not exist, pass posix_test_lock a struct file with
2865          * only the dentry:inode set.
2866          */
2867         memset(&file, 0, sizeof (struct file));
2868         file.f_dentry = current_fh->fh_dentry;
2869
2870         status = nfs_ok;
2871         conflicting_lock = posix_test_lock(&file, &file_lock);
2872         if (conflicting_lock) {
2873                 status = nfserr_denied;
2874                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2875         }
2876 out:
2877         nfs4_unlock_state();
2878         return status;
2879 }
2880
2881 int
2882 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2883 {
2884         struct nfs4_stateid *stp;
2885         struct file *filp = NULL;
2886         struct file_lock file_lock;
2887         int status;
2888
2889         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2890                 (long long) locku->lu_offset,
2891                 (long long) locku->lu_length);
2892
2893         if (check_lock_length(locku->lu_offset, locku->lu_length))
2894                  return nfserr_inval;
2895
2896         nfs4_lock_state();
2897
2898         if ((status = nfs4_preprocess_seqid_op(current_fh,
2899                                         locku->lu_seqid,
2900                                         &locku->lu_stateid,
2901                                         CHECK_FH | LOCK_STATE,
2902                                         &locku->lu_stateowner, &stp, NULL)))
2903                 goto out;
2904
2905         filp = stp->st_vfs_file;
2906         BUG_ON(!filp);
2907         locks_init_lock(&file_lock);
2908         file_lock.fl_type = F_UNLCK;
2909         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2910         file_lock.fl_pid = current->tgid;
2911         file_lock.fl_file = filp;
2912         file_lock.fl_flags = FL_POSIX;
2913         file_lock.fl_start = locku->lu_offset;
2914
2915         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2916                 file_lock.fl_end = ~(u64)0;
2917         else
2918                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2919         nfs4_transform_lock_offset(&file_lock);
2920
2921         /*
2922         *  Try to unlock the file in the VFS.
2923         */
2924         status = posix_lock_file(filp, &file_lock);
2925         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2926                 file_lock.fl_ops->fl_release_private(&file_lock);
2927         if (status) {
2928                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2929                 goto out_nfserr;
2930         }
2931         /*
2932         * OK, unlock succeeded; the only thing left to do is update the stateid.
2933         */
2934         update_stateid(&stp->st_stateid);
2935         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2936
2937 out:
2938         if (locku->lu_stateowner)
2939                 nfs4_get_stateowner(locku->lu_stateowner);
2940         nfs4_unlock_state();
2941         return status;
2942
2943 out_nfserr:
2944         status = nfserrno(status);
2945         goto out;
2946 }
2947
2948 /*
2949  * returns
2950  *      1: locks held by lockowner
2951  *      0: no locks held by lockowner
2952  */
2953 static int
2954 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2955 {
2956         struct file_lock **flpp;
2957         struct inode *inode = filp->f_dentry->d_inode;
2958         int status = 0;
2959
2960         lock_kernel();
2961         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2962                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2963                         status = 1;
2964                         goto out;
2965         }
2966 out:
2967         unlock_kernel();
2968         return status;
2969 }
2970
2971 int
2972 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2973 {
2974         clientid_t *clid = &rlockowner->rl_clientid;
2975         struct nfs4_stateowner *local = NULL;
2976         struct xdr_netobj *owner = &rlockowner->rl_owner;
2977         int status;
2978
2979         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2980                 clid->cl_boot, clid->cl_id);
2981
2982         /* XXX check for lease expiration */
2983
2984         status = nfserr_stale_clientid;
2985         if (STALE_CLIENTID(clid)) {
2986                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
2987                 return status;
2988         }
2989
2990         nfs4_lock_state();
2991
2992         status = nfs_ok;
2993         local = find_lockstateowner(owner, clid);
2994         if (local) {
2995                 struct nfs4_stateid *stp;
2996
2997                 /* check for any locks held by any stateid
2998                  * associated with the (lock) stateowner */
2999                 status = nfserr_locks_held;
3000                 list_for_each_entry(stp, &local->so_perfilestate,
3001                                 st_perfilestate) {
3002                         if (check_for_locks(stp->st_vfs_file, local))
3003                                 goto out;
3004                 }
3005                 /* no locks held by (lock) stateowner */
3006                 status = nfs_ok;
3007                 release_stateowner(local);
3008         }
3009 out:
3010         nfs4_unlock_state();
3011         return status;
3012 }
3013
3014 static inline struct nfs4_client_reclaim *
3015 alloc_reclaim(int namelen)
3016 {
3017         struct nfs4_client_reclaim *crp = NULL;
3018
3019         crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3020         if (!crp)
3021                 return NULL;
3022         crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3023         if (!crp->cr_name.data) {
3024                 kfree(crp);
3025                 return NULL;
3026         }
3027         return crp;
3028 }
3029
3030 /*
3031  * failure => all reset bets are off, nfserr_no_grace...
3032  */
3033 static int
3034 nfs4_client_to_reclaim(char *name, int namlen)
3035 {
3036         unsigned int strhashval;
3037         struct nfs4_client_reclaim *crp = NULL;
3038
3039         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3040         crp = alloc_reclaim(namlen);
3041         if (!crp)
3042                 return 0;
3043         strhashval = clientstr_hashval(name, namlen);
3044         INIT_LIST_HEAD(&crp->cr_strhash);
3045         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3046         memcpy(crp->cr_name.data, name, namlen);
3047         crp->cr_name.len = namlen;
3048         reclaim_str_hashtbl_size++;
3049         return 1;
3050 }
3051
3052 static void
3053 nfs4_release_reclaim(void)
3054 {
3055         struct nfs4_client_reclaim *crp = NULL;
3056         int i;
3057
3058         BUG_ON(!nfs4_reclaim_init);
3059         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3060                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3061                         crp = list_entry(reclaim_str_hashtbl[i].next,
3062                                         struct nfs4_client_reclaim, cr_strhash);
3063                         list_del(&crp->cr_strhash);
3064                         kfree(crp->cr_name.data);
3065                         kfree(crp);
3066                         reclaim_str_hashtbl_size--;
3067                 }
3068         }
3069         BUG_ON(reclaim_str_hashtbl_size);
3070 }
3071
3072 /*
3073  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3074 struct nfs4_client_reclaim *
3075 nfs4_find_reclaim_client(clientid_t *clid)
3076 {
3077         unsigned int strhashval;
3078         struct nfs4_client *clp;
3079         struct nfs4_client_reclaim *crp = NULL;
3080
3081
3082         /* find clientid in conf_id_hashtbl */
3083         clp = find_confirmed_client(clid);
3084         if (clp == NULL)
3085                 return NULL;
3086
3087         dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3088                             clp->cl_name.len, clp->cl_name.data);
3089
3090         /* find clp->cl_name in reclaim_str_hashtbl */
3091         strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3092         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3093                 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3094                         return crp;
3095                 }
3096         }
3097         return NULL;
3098 }
3099
3100 /*
3101 * Called from OPEN. Look for clientid in reclaim list.
3102 */
3103 int
3104 nfs4_check_open_reclaim(clientid_t *clid)
3105 {
3106         struct nfs4_client_reclaim *crp;
3107
3108         if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
3109                 return nfserr_reclaim_bad;
3110         return nfs_ok;
3111 }
3112
3113
3114 /*
3115  * Start and stop routines
3116  */
3117
3118 static void
3119 __nfs4_state_init(void)
3120 {
3121         int i;
3122         time_t grace_time;
3123
3124         if (!nfs4_reclaim_init) {
3125                 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3126                         INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3127                 reclaim_str_hashtbl_size = 0;
3128                 nfs4_reclaim_init = 1;
3129         }
3130         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3131                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3132                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3133                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3134                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3135         }
3136         for (i = 0; i < FILE_HASH_SIZE; i++) {
3137                 INIT_LIST_HEAD(&file_hashtbl[i]);
3138         }
3139         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3140                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3141                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3142         }
3143         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3144                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3145                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3146         }
3147         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3148                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3149                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3150         }
3151         memset(&zerostateid, 0, sizeof(stateid_t));
3152         memset(&onestateid, ~0, sizeof(stateid_t));
3153
3154         INIT_LIST_HEAD(&close_lru);
3155         INIT_LIST_HEAD(&client_lru);
3156         INIT_LIST_HEAD(&del_recall_lru);
3157         spin_lock_init(&recall_lock);
3158         boot_time = get_seconds();
3159         grace_time = max(old_lease_time, lease_time);
3160         if (reclaim_str_hashtbl_size == 0)
3161                 grace_time = 0;
3162         if (grace_time)
3163                 printk("NFSD: starting %ld-second grace period\n", grace_time);
3164         grace_end = boot_time + grace_time;
3165         INIT_WORK(&laundromat_work,laundromat_main, NULL);
3166         schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
3167 }
3168
3169 int
3170 nfs4_state_init(void)
3171 {
3172         int status;
3173
3174         if (nfs4_init)
3175                 return 0;
3176         status = nfsd4_init_slabs();
3177         if (status)
3178                 return status;
3179         __nfs4_state_init();
3180         nfs4_init = 1;
3181         return 0;
3182 }
3183
3184 int
3185 nfs4_in_grace(void)
3186 {
3187         return get_seconds() < grace_end;
3188 }
3189
3190 void
3191 set_no_grace(void)
3192 {
3193         printk("NFSD: ERROR in reboot recovery.  State reclaims will fail.\n");
3194         grace_end = get_seconds();
3195 }
3196
3197 time_t
3198 nfs4_lease_time(void)
3199 {
3200         return lease_time;
3201 }
3202
3203 static void
3204 __nfs4_state_shutdown(void)
3205 {
3206         int i;
3207         struct nfs4_client *clp = NULL;
3208         struct nfs4_delegation *dp = NULL;
3209         struct nfs4_stateowner *sop = NULL;
3210         struct list_head *pos, *next, reaplist;
3211
3212         list_for_each_safe(pos, next, &close_lru) {
3213                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3214                 list_del(&sop->so_close_lru);
3215                 nfs4_put_stateowner(sop);
3216         }
3217
3218         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3219                 while (!list_empty(&conf_id_hashtbl[i])) {
3220                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3221                         expire_client(clp);
3222                 }
3223                 while (!list_empty(&unconf_str_hashtbl[i])) {
3224                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3225                         expire_client(clp);
3226                 }
3227         }
3228         INIT_LIST_HEAD(&reaplist);
3229         spin_lock(&recall_lock);
3230         list_for_each_safe(pos, next, &del_recall_lru) {
3231                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3232                 list_move(&dp->dl_recall_lru, &reaplist);
3233         }
3234         spin_unlock(&recall_lock);
3235         list_for_each_safe(pos, next, &reaplist) {
3236                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3237                 list_del_init(&dp->dl_recall_lru);
3238                 unhash_delegation(dp);
3239         }
3240
3241         release_all_files();
3242         cancel_delayed_work(&laundromat_work);
3243         flush_scheduled_work();
3244         nfs4_init = 0;
3245         dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
3246                         list_add_perfile, list_del_perfile);
3247         dprintk("NFSD: add_perclient %d del_perclient %d\n",
3248                         add_perclient, del_perclient);
3249         dprintk("NFSD: alloc_file %d free_file %d\n",
3250                         alloc_file, free_file);
3251         dprintk("NFSD: vfsopen %d vfsclose %d\n",
3252                         vfsopen, vfsclose);
3253         dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
3254                         alloc_delegation, free_delegation);
3255
3256 }
3257
3258 void
3259 nfs4_state_shutdown(void)
3260 {
3261         nfs4_lock_state();
3262         nfs4_release_reclaim();
3263         __nfs4_state_shutdown();
3264         nfsd4_free_slabs();
3265         nfs4_unlock_state();
3266 }
3267
3268 /*
3269  * Called when leasetime is changed.
3270  *
3271  * if nfsd is not started, simply set the global lease.
3272  *
3273  * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
3274  * e.g: boot_time is reset, existing nfs4_client structs are
3275  * used to fill reclaim_str_hashtbl, then all state (except for the
3276  * reclaim_str_hashtbl) is re-initialized.
3277  *
3278  * if the old lease time is greater than the new lease time, the grace
3279  * period needs to be set to the old lease time to allow clients to reclaim
3280  * their state. XXX - we may want to set the grace period == lease time
3281  * after an initial grace period == old lease time
3282  *
3283  * if an error occurs in this process, the new lease is set, but the server
3284  * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
3285  * which means OPEN/LOCK/READ/WRITE will fail during grace period.
3286  *
3287  * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
3288  * OPEN and LOCK reclaims.
3289  */
3290 void
3291 nfs4_reset_lease(time_t leasetime)
3292 {
3293         struct nfs4_client *clp;
3294         int i;
3295
3296         printk("NFSD: New leasetime %ld\n",leasetime);
3297         if (!nfs4_init)
3298                 return;
3299         nfs4_lock_state();
3300         old_lease_time = lease_time;
3301         lease_time = leasetime;
3302
3303         nfs4_release_reclaim();
3304
3305         /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
3306         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3307                 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
3308                         if (!nfs4_client_to_reclaim(clp->cl_name.data,
3309                                                 clp->cl_name.len)) {
3310                                 nfs4_release_reclaim();
3311                                 goto init_state;
3312                         }
3313                 }
3314         }
3315 init_state:
3316         __nfs4_state_shutdown();
3317         __nfs4_state_init();
3318         nfs4_unlock_state();
3319 }
3320