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/nfs4.h>
  48 #include <linux/nfsd/state.h>
  49 #include <linux/nfsd/xdr4.h>
  50
  51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  52
  53 /* Globals */
  54 static time_t lease_time = 90;     /* default lease time */
  55 static time_t old_lease_time = 90; /* past incarnation lease time */
  56 static u32 nfs4_reclaim_init = 0;
  57 time_t boot_time;
  58 static time_t grace_end = 0;
  59 static u32 current_clientid = 1;
  60 static u32 current_ownerid;
  61 static u32 current_fileid;
  62 static u32 nfs4_init;
  63 stateid_t zerostateid;             /* bits all 0 */
  64 stateid_t onestateid;              /* bits all 1 */
  65
  66 /* debug counters */
  67 u32 list_add_perfile = 0;
  68 u32 list_del_perfile = 0;
  69 u32 add_perclient = 0;
  70 u32 del_perclient = 0;
  71 u32 alloc_file = 0;
  72 u32 free_file = 0;
  73 u32 alloc_sowner = 0;
  74 u32 free_sowner = 0;
  75 u32 vfsopen = 0;
  76 u32 vfsclose = 0;
  77 u32 alloc_lsowner= 0;
  78
  79 /* forward declarations */
  80 struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  81
  82 /* Locking:
  83  *
  84  * client_sema:
  85  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  86  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  87  */
  88 static DECLARE_MUTEX(client_sema);
  89
  90 void
  91 nfs4_lock_state(void)
  92 {
  93         down(&client_sema);
  94 }
  95
  96 /*
  97  * nfs4_unlock_state(); called in encode
  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 /*
 125  * SETCLIENTID state
 126  */
 127
 128 /* Hash tables for nfs4_clientid state */
 129 #define CLIENT_HASH_BITS                 4
 130 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 131 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 132
 133 #define clientid_hashval(id) \
 134         ((id) & CLIENT_HASH_MASK)
 135 #define clientstr_hashval(name, namelen) \
 136         (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
 137 /*
 138  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 139  * used in reboot/reset lease grace period processing
 140  *
 141  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 142  * setclientid_confirmed info.
 143  *
 144  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 145  * setclientid info.
 146  *
 147  * client_lru holds client queue ordered by nfs4_client.cl_time
 148  * for lease renewal.
 149  *
 150  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 151  * for last close replay.
 152  */
 153 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 154 static int reclaim_str_hashtbl_size;
 155 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 156 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 157 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 158 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 159 static struct list_head client_lru;
 160 static struct list_head close_lru;
 161
 162 static inline void
 163 renew_client(struct nfs4_client *clp)
 164 {
 165         /*
 166         * Move client to the end to the LRU list.
 167         */
 168         dprintk("renewing client (clientid %08x/%08x)\n",
 169                         clp->cl_clientid.cl_boot,
 170                         clp->cl_clientid.cl_id);
 171         list_move_tail(&clp->cl_lru, &client_lru);
 172         clp->cl_time = get_seconds();
 173 }
 174
 175 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 176 static int
 177 STALE_CLIENTID(clientid_t *clid)
 178 {
 179         if (clid->cl_boot == boot_time)
 180                 return 0;
 181         dprintk("NFSD stale clientid (%08x/%08x)\n",
 182                         clid->cl_boot, clid->cl_id);
 183         return 1;
 184 }
 185
 186 /*
 187  * XXX Should we use a slab cache ?
 188  * This type of memory management is somewhat inefficient, but we use it
 189  * anyway since SETCLIENTID is not a common operation.
 190  */
 191 static inline struct nfs4_client *
 192 alloc_client(struct xdr_netobj name)
 193 {
 194         struct nfs4_client *clp;
 195
 196         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 197                 memset(clp, 0, sizeof(*clp));
 198                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 199                         memcpy(clp->cl_name.data, name.data, name.len);
 200                         clp->cl_name.len = name.len;
 201                 }
 202                 else {
 203                         kfree(clp);
 204                         clp = NULL;
 205                 }
 206         }
 207         return clp;
 208 }
 209
 210 static inline void
 211 free_client(struct nfs4_client *clp)
 212 {
 213         if (clp->cl_cred.cr_group_info)
 214                 put_group_info(clp->cl_cred.cr_group_info);
 215         kfree(clp->cl_name.data);
 216         kfree(clp);
 217 }
 218
 219 static void
 220 expire_client(struct nfs4_client *clp)
 221 {
 222         struct nfs4_stateowner *sop;
 223
 224         dprintk("NFSD: expire_client\n");
 225         list_del(&clp->cl_idhash);
 226         list_del(&clp->cl_strhash);
 227         list_del(&clp->cl_lru);
 228         while (!list_empty(&clp->cl_perclient)) {
 229                 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
 230                 release_stateowner(sop);
 231         }
 232         free_client(clp);
 233 }
 234
 235 static struct nfs4_client *
 236 create_client(struct xdr_netobj name) {
 237         struct nfs4_client *clp;
 238
 239         if (!(clp = alloc_client(name)))
 240                 goto out;
 241         INIT_LIST_HEAD(&clp->cl_idhash);
 242         INIT_LIST_HEAD(&clp->cl_strhash);
 243         INIT_LIST_HEAD(&clp->cl_perclient);
 244         INIT_LIST_HEAD(&clp->cl_lru);
 245 out:
 246         return clp;
 247 }
 248
 249 static void
 250 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 251         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 252 }
 253
 254 static void
 255 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 256         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 257         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 258 }
 259
 260 static void
 261 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 262
 263         target->cr_uid = source->cr_uid;
 264         target->cr_gid = source->cr_gid;
 265         target->cr_group_info = source->cr_group_info;
 266         get_group_info(target->cr_group_info);
 267 }
 268
 269 static int
 270 cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
 271         if (!n1 || !n2)
 272                 return 0;
 273         return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
 274 }
 275
 276 static int
 277 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 278         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 279 }
 280
 281 static int
 282 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 283         return((cl1->cl_boot == cl2->cl_boot) &&
 284                 (cl1->cl_id == cl2->cl_id));
 285 }
 286
 287 /* XXX what about NGROUP */
 288 static int
 289 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 290         return(cr1->cr_uid == cr2->cr_uid);
 291
 292 }
 293
 294 static void
 295 gen_clid(struct nfs4_client *clp) {
 296         clp->cl_clientid.cl_boot = boot_time;
 297         clp->cl_clientid.cl_id = current_clientid++;
 298 }
 299
 300 static void
 301 gen_confirm(struct nfs4_client *clp) {
 302         struct timespec         tv;
 303         u32 *                   p;
 304
 305         tv = CURRENT_TIME;
 306         p = (u32 *)clp->cl_confirm.data;
 307         *p++ = tv.tv_sec;
 308         *p++ = tv.tv_nsec;
 309 }
 310
 311 static int
 312 check_name(struct xdr_netobj name) {
 313
 314         if (name.len == 0)
 315                 return 0;
 316         if (name.len > NFS4_OPAQUE_LIMIT) {
 317                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 318                 return 0;
 319         }
 320         return 1;
 321 }
 322
 323 void
 324 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 325 {
 326         unsigned int idhashval;
 327
 328         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 329         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 330         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 331         list_add_tail(&clp->cl_lru, &client_lru);
 332         clp->cl_time = get_seconds();
 333 }
 334
 335 void
 336 move_to_confirmed(struct nfs4_client *clp, unsigned int idhashval)
 337 {
 338         unsigned int strhashval;
 339
 340         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 341         list_del_init(&clp->cl_strhash);
 342         list_del_init(&clp->cl_idhash);
 343         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 344         strhashval = clientstr_hashval(clp->cl_name.data,
 345                         clp->cl_name.len);
 346         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 347         renew_client(clp);
 348 }
 349
 350
 351 /* a helper function for parse_callback */
 352 static int
 353 parse_octet(unsigned int *lenp, char **addrp)
 354 {
 355         unsigned int len = *lenp;
 356         char *p = *addrp;
 357         int n = -1;
 358         char c;
 359
 360         for (;;) {
 361                 if (!len)
 362                         break;
 363                 len--;
 364                 c = *p++;
 365                 if (c == '.')
 366                         break;
 367                 if ((c < '0') || (c > '9')) {
 368                         n = -1;
 369                         break;
 370                 }
 371                 if (n < 0)
 372                         n = 0;
 373                 n = (n * 10) + (c - '0');
 374                 if (n > 255) {
 375                         n = -1;
 376                         break;
 377                 }
 378         }
 379         *lenp = len;
 380         *addrp = p;
 381         return n;
 382 }
 383
 384 /* parse and set the setclientid ipv4 callback address */
 385 int
 386 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 387 {
 388         int temp = 0;
 389         u32 cbaddr = 0;
 390         u16 cbport = 0;
 391         u32 addrlen = addr_len;
 392         char *addr = addr_val;
 393         int i, shift;
 394
 395         /* ipaddress */
 396         shift = 24;
 397         for(i = 4; i > 0  ; i--) {
 398                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 399                         return 0;
 400                 }
 401                 cbaddr |= (temp << shift);
 402                 if (shift > 0)
 403                 shift -= 8;
 404         }
 405         *cbaddrp = cbaddr;
 406
 407         /* port */
 408         shift = 8;
 409         for(i = 2; i > 0  ; i--) {
 410                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 411                         return 0;
 412                 }
 413                 cbport |= (temp << shift);
 414                 if (shift > 0)
 415                         shift -= 8;
 416         }
 417         *cbportp = cbport;
 418         return 1;
 419 }
 420
 421 void
 422 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 423 {
 424         struct nfs4_callback *cb = &clp->cl_callback;
 425
 426         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 427                          &cb->cb_addr, &cb->cb_port))) {
 428                 printk(KERN_INFO "NFSD: BAD callback address. client will not receive delegations\n");
 429                 cb->cb_parsed = 0;
 430                 return;
 431         }
 432         cb->cb_netid.len = se->se_callback_netid_len;
 433         cb->cb_netid.data = se->se_callback_netid_val;
 434         cb->cb_prog = se->se_callback_prog;
 435         cb->cb_ident = se->se_callback_ident;
 436         cb->cb_parsed = 1;
 437 }
 438
 439 /*
 440  * RFC 3010 has a complex implmentation description of processing a
 441  * SETCLIENTID request consisting of 5 bullets, labeled as
 442  * CASE0 - CASE4 below.
 443  *
 444  * NOTES:
 445  *      callback information will be processed in a future patch
 446  *
 447  *      an unconfirmed record is added when:
 448  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 449  *      CASE 1: confirmed record found with matching name, principal,
 450  *              verifier, and clientid.
 451  *      CASE 2: confirmed record found with matching name, principal,
 452  *              and there is no unconfirmed record with matching
 453  *              name and principal
 454  *
 455  *      an unconfirmed record is replaced when:
 456  *      CASE 3: confirmed record found with matching name, principal,
 457  *              and an unconfirmed record is found with matching
 458  *              name, principal, and with clientid and
 459  *              confirm that does not match the confirmed record.
 460  *      CASE 4: there is no confirmed record with matching name and
 461  *              principal. there is an unconfirmed record with
 462  *              matching name, principal.
 463  *
 464  *      an unconfirmed record is deleted when:
 465  *      CASE 1: an unconfirmed record that matches input name, verifier,
 466  *              and confirmed clientid.
 467  *      CASE 4: any unconfirmed records with matching name and principal
 468  *              that exist after an unconfirmed record has been replaced
 469  *              as described above.
 470  *
 471  */
 472 int
 473 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 474 {
 475         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 476         struct xdr_netobj       clname = {
 477                 .len = setclid->se_namelen,
 478                 .data = setclid->se_name,
 479         };
 480         nfs4_verifier           clverifier = setclid->se_verf;
 481         unsigned int            strhashval;
 482         struct nfs4_client *    conf, * unconf, * new, * clp;
 483         int                     status;
 484
 485         status = nfserr_inval;
 486         if (!check_name(clname))
 487                 goto out;
 488
 489         /*
 490          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 491          * We get here on a DRC miss.
 492          */
 493
 494         strhashval = clientstr_hashval(clname.data, clname.len);
 495
 496         conf = NULL;
 497         nfs4_lock_state();
 498         list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
 499                 if (!cmp_name(&clp->cl_name, &clname))
 500                         continue;
 501                 /*
 502                  * CASE 0:
 503                  * clname match, confirmed, different principal
 504                  * or different ip_address
 505                  */
 506                 status = nfserr_clid_inuse;
 507                 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
 508                         printk("NFSD: setclientid: string in use by client"
 509                         "(clientid %08x/%08x)\n",
 510                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 511                         goto out;
 512                 }
 513                 if (clp->cl_addr != ip_addr) {
 514                         printk("NFSD: setclientid: string in use by client"
 515                         "(clientid %08x/%08x)\n",
 516                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 517                         goto out;
 518                 }
 519
 520                 /*
 521                  * cl_name match from a previous SETCLIENTID operation
 522                  * XXX check for additional matches?
 523                  */
 524                 conf = clp;
 525                 break;
 526         }
 527         unconf = NULL;
 528         list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
 529                 if (!cmp_name(&clp->cl_name, &clname))
 530                         continue;
 531                 /* cl_name match from a previous SETCLIENTID operation */
 532                 unconf = clp;
 533                 break;
 534         }
 535         status = nfserr_resource;
 536         if (!conf) {
 537                 /*
 538                  * CASE 4:
 539                  * placed first, because it is the normal case.
 540                  */
 541                 if (unconf)
 542                         expire_client(unconf);
 543                 if (!(new = create_client(clname)))
 544                         goto out;
 545                 copy_verf(new, &clverifier);
 546                 new->cl_addr = ip_addr;
 547                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 548                 gen_clid(new);
 549                 gen_confirm(new);
 550                 gen_callback(new, setclid);
 551                 add_to_unconfirmed(new, strhashval);
 552         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 553                 /*
 554                  * CASE 1:
 555                  * cl_name match, confirmed, principal match
 556                  * verifier match: probable callback update
 557                  *
 558                  * remove any unconfirmed nfs4_client with
 559                  * matching cl_name, cl_verifier, and cl_clientid
 560                  *
 561                  * create and insert an unconfirmed nfs4_client with same
 562                  * cl_name, cl_verifier, and cl_clientid as existing
 563                  * nfs4_client,  but with the new callback info and a
 564                  * new cl_confirm
 565                  */
 566                 if ((unconf) &&
 567                     cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
 568                      cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
 569                                 expire_client(unconf);
 570                 }
 571                 if (!(new = create_client(clname)))
 572                         goto out;
 573                 copy_verf(new,&conf->cl_verifier);
 574                 new->cl_addr = ip_addr;
 575                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 576                 copy_clid(new, conf);
 577                 gen_confirm(new);
 578                 gen_callback(new, setclid);
 579                 add_to_unconfirmed(new,strhashval);
 580         } else if (!unconf) {
 581                 /*
 582                  * CASE 2:
 583                  * clname match, confirmed, principal match
 584                  * verfier does not match
 585                  * no unconfirmed. create a new unconfirmed nfs4_client
 586                  * using input clverifier, clname, and callback info
 587                  * and generate a new cl_clientid and cl_confirm.
 588                  */
 589                 if (!(new = create_client(clname)))
 590                         goto out;
 591                 copy_verf(new,&clverifier);
 592                 new->cl_addr = ip_addr;
 593                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 594                 gen_clid(new);
 595                 gen_confirm(new);
 596                 gen_callback(new, setclid);
 597                 add_to_unconfirmed(new, strhashval);
 598         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 599                 /*
 600                  * CASE3:
 601                  * confirmed found (name, principal match)
 602                  * confirmed verifier does not match input clverifier
 603                  *
 604                  * unconfirmed found (name match)
 605                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 606                  *
 607                  * remove unconfirmed.
 608                  *
 609                  * create an unconfirmed nfs4_client
 610                  * with same cl_name as existing confirmed nfs4_client,
 611                  * but with new callback info, new cl_clientid,
 612                  * new cl_verifier and a new cl_confirm
 613                  */
 614                 expire_client(unconf);
 615                 if (!(new = create_client(clname)))
 616                         goto out;
 617                 copy_verf(new,&clverifier);
 618                 new->cl_addr = ip_addr;
 619                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 620                 gen_clid(new);
 621                 gen_confirm(new);
 622                 gen_callback(new, setclid);
 623                 add_to_unconfirmed(new, strhashval);
 624         } else {
 625                 /* No cases hit !!! */
 626                 status = nfserr_inval;
 627                 goto out;
 628
 629         }
 630         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 631         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 632         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 633         status = nfs_ok;
 634 out:
 635         nfs4_unlock_state();
 636         return status;
 637 }
 638
 639
 640 /*
 641  * RFC 3010 has a complex implmentation description of processing a
 642  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 643  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 644  *
 645  * NOTE: callback information will be processed here in a future patch
 646  */
 647 int
 648 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 649 {
 650         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 651         unsigned int idhashval;
 652         struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
 653         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 654         clientid_t * clid = &setclientid_confirm->sc_clientid;
 655         int status;
 656
 657         status = nfserr_stale_clientid;
 658         if (STALE_CLIENTID(clid))
 659                 goto out;
 660         /*
 661          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 662          * We get here on a DRC miss.
 663          */
 664
 665         idhashval = clientid_hashval(clid->cl_id);
 666         nfs4_lock_state();
 667         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 668                 if (!cmp_clid(&clp->cl_clientid, clid))
 669                         continue;
 670
 671                 status = nfserr_inval;
 672                 /*
 673                  * Found a record for this clientid. If the IP addresses
 674                  * don't match, return ERR_INVAL just as if the record had
 675                  * not been found.
 676                  */
 677                 if (clp->cl_addr != ip_addr) {
 678                         printk("NFSD: setclientid: string in use by client"
 679                         "(clientid %08x/%08x)\n",
 680                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 681                         goto out;
 682                 }
 683                 conf = clp;
 684                 break;
 685         }
 686         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 687                 if (!cmp_clid(&clp->cl_clientid, clid))
 688                         continue;
 689                 status = nfserr_inval;
 690                 if (clp->cl_addr != ip_addr) {
 691                         printk("NFSD: setclientid: string in use by client"
 692                         "(clientid %08x/%08x)\n",
 693                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 694                         goto out;
 695                 }
 696                 unconf = clp;
 697                 break;
 698         }
 699         /* CASE 1:
 700         * unconf record that matches input clientid and input confirm.
 701         * conf record that matches input clientid.
 702         * conf  and unconf records match names, verifiers
 703         */
 704         if ((conf && unconf) &&
 705             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 706             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 707             (cmp_name(&conf->cl_name,&unconf->cl_name))  &&
 708             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 709                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 710                         status = nfserr_clid_inuse;
 711                 else {
 712                         expire_client(conf);
 713                         move_to_confirmed(unconf, idhashval);
 714                         status = nfs_ok;
 715                 }
 716                 goto out;
 717         }
 718         /* CASE 2:
 719          * conf record that matches input clientid.
 720          * if unconf record that matches input clientid, then unconf->cl_name
 721          * or unconf->cl_verifier don't match the conf record.
 722          */
 723         if ((conf && !unconf) ||
 724             ((conf && unconf) &&
 725              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 726               !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
 727                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 728                         status = nfserr_clid_inuse;
 729                 } else {
 730                         status = nfs_ok;
 731                 }
 732                 goto out;
 733         }
 734         /* CASE 3:
 735          * conf record not found.
 736          * unconf record found.
 737          * unconf->cl_confirm matches input confirm
 738          */
 739         if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
 740                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 741                         status = nfserr_clid_inuse;
 742                 } else {
 743                         status = nfs_ok;
 744                         move_to_confirmed(unconf, idhashval);
 745                 }
 746                 goto out;
 747         }
 748         /* CASE 4:
 749          * conf record not found, or if conf, then conf->cl_confirm does not
 750          * match input confirm.
 751          * unconf record not found, or if unconf, then unconf->cl_confirm
 752          * does not match input confirm.
 753          */
 754         if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
 755             (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
 756                 status = nfserr_stale_clientid;
 757                 goto out;
 758         }
 759         /* check that we have hit one of the cases...*/
 760         status = nfserr_inval;
 761         goto out;
 762 out:
 763         /* XXX if status == nfs_ok, probe callback path */
 764         nfs4_unlock_state();
 765         return status;
 766 }
 767
 768 /*
 769  * Open owner state (share locks)
 770  */
 771
 772 /* hash tables for nfs4_stateowner */
 773 #define OWNER_HASH_BITS              8
 774 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 775 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 776
 777 #define ownerid_hashval(id) \
 778         ((id) & OWNER_HASH_MASK)
 779 #define ownerstr_hashval(clientid, ownername) \
 780         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 781
 782 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 783 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 784
 785 /* hash table for nfs4_file */
 786 #define FILE_HASH_BITS                   8
 787 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 788 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 789 /* hash table for (open)nfs4_stateid */
 790 #define STATEID_HASH_BITS              10
 791 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 792 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 793
 794 #define file_hashval(x) \
 795         hash_ptr(x, FILE_HASH_BITS)
 796 #define stateid_hashval(owner_id, file_id)  \
 797         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 798
 799 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 800 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 801
 802 /* OPEN Share state helper functions */
 803 static inline struct nfs4_file *
 804 alloc_init_file(unsigned int hashval, struct inode *ino) {
 805         struct nfs4_file *fp;
 806         if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
 807                 INIT_LIST_HEAD(&fp->fi_hash);
 808                 INIT_LIST_HEAD(&fp->fi_perfile);
 809                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 810                 fp->fi_inode = igrab(ino);
 811                 fp->fi_id = current_fileid++;
 812                 alloc_file++;
 813                 return fp;
 814         }
 815         return NULL;
 816 }
 817
 818 static void
 819 release_all_files(void)
 820 {
 821         int i;
 822         struct nfs4_file *fp;
 823
 824         for (i=0;i<FILE_HASH_SIZE;i++) {
 825                 while (!list_empty(&file_hashtbl[i])) {
 826                         fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
 827                         /* this should never be more than once... */
 828                         if (!list_empty(&fp->fi_perfile)) {
 829                                 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
 830                         }
 831                         release_file(fp);
 832                 }
 833         }
 834 }
 835
 836 static inline struct nfs4_stateowner *
 837 alloc_stateowner(struct xdr_netobj *owner)
 838 {
 839         struct nfs4_stateowner *sop;
 840
 841         if ((sop = kmalloc(sizeof(struct nfs4_stateowner),GFP_KERNEL))) {
 842                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
 843                         memcpy(sop->so_owner.data, owner->data, owner->len);
 844                         sop->so_owner.len = owner->len;
 845                         return sop;
 846                 }
 847                 kfree(sop);
 848         }
 849         return NULL;
 850 }
 851
 852 /* should use a slab cache */
 853 static void
 854 free_stateowner(struct nfs4_stateowner *sop) {
 855         if (sop) {
 856                 kfree(sop->so_owner.data);
 857                 kfree(sop);
 858                 sop = NULL;
 859                 free_sowner++;
 860         }
 861 }
 862
 863 static struct nfs4_stateowner *
 864 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
 865         struct nfs4_stateowner *sop;
 866         struct nfs4_replay *rp;
 867         unsigned int idhashval;
 868
 869         if (!(sop = alloc_stateowner(&open->op_owner)))
 870                 return NULL;
 871         idhashval = ownerid_hashval(current_ownerid);
 872         INIT_LIST_HEAD(&sop->so_idhash);
 873         INIT_LIST_HEAD(&sop->so_strhash);
 874         INIT_LIST_HEAD(&sop->so_perclient);
 875         INIT_LIST_HEAD(&sop->so_perfilestate);
 876         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
 877         INIT_LIST_HEAD(&sop->so_close_lru);
 878         sop->so_time = 0;
 879         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
 880         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
 881         list_add(&sop->so_perclient, &clp->cl_perclient);
 882         add_perclient++;
 883         sop->so_is_open_owner = 1;
 884         sop->so_id = current_ownerid++;
 885         sop->so_client = clp;
 886         sop->so_seqid = open->op_seqid;
 887         sop->so_confirmed = 0;
 888         rp = &sop->so_replay;
 889         rp->rp_status = NFSERR_SERVERFAULT;
 890         rp->rp_buflen = 0;
 891         rp->rp_buf = rp->rp_ibuf;
 892         alloc_sowner++;
 893         return sop;
 894 }
 895
 896 static void
 897 release_stateid_lockowner(struct nfs4_stateid *open_stp)
 898 {
 899         struct nfs4_stateowner *lock_sop;
 900
 901         while (!list_empty(&open_stp->st_perlockowner)) {
 902                 lock_sop = list_entry(open_stp->st_perlockowner.next,
 903                                 struct nfs4_stateowner, so_perlockowner);
 904                 /* list_del(&open_stp->st_perlockowner);  */
 905                 BUG_ON(lock_sop->so_is_open_owner);
 906                 release_stateowner(lock_sop);
 907         }
 908 }
 909
 910 static void
 911 unhash_stateowner(struct nfs4_stateowner *sop)
 912 {
 913         struct nfs4_stateid *stp;
 914
 915         list_del(&sop->so_idhash);
 916         list_del(&sop->so_strhash);
 917         list_del(&sop->so_perclient);
 918         list_del(&sop->so_perlockowner);
 919         del_perclient++;
 920         while (!list_empty(&sop->so_perfilestate)) {
 921                 stp = list_entry(sop->so_perfilestate.next,
 922                         struct nfs4_stateid, st_perfilestate);
 923                 if (sop->so_is_open_owner)
 924                         release_stateid(stp, OPEN_STATE);
 925                 else
 926                         release_stateid(stp, LOCK_STATE);
 927         }
 928 }
 929
 930 static void
 931 release_stateowner(struct nfs4_stateowner *sop)
 932 {
 933         unhash_stateowner(sop);
 934         list_del(&sop->so_close_lru);
 935         free_stateowner(sop);
 936 }
 937
 938 static inline void
 939 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfs4_stateowner *sop, struct nfsd4_open *open) {
 940         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
 941
 942         INIT_LIST_HEAD(&stp->st_hash);
 943         INIT_LIST_HEAD(&stp->st_perfilestate);
 944         INIT_LIST_HEAD(&stp->st_perlockowner);
 945         INIT_LIST_HEAD(&stp->st_perfile);
 946         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
 947         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
 948         list_add_perfile++;
 949         list_add(&stp->st_perfile, &fp->fi_perfile);
 950         stp->st_stateowner = sop;
 951         stp->st_file = fp;
 952         stp->st_stateid.si_boot = boot_time;
 953         stp->st_stateid.si_stateownerid = sop->so_id;
 954         stp->st_stateid.si_fileid = fp->fi_id;
 955         stp->st_stateid.si_generation = 0;
 956         stp->st_access_bmap = 0;
 957         stp->st_deny_bmap = 0;
 958         __set_bit(open->op_share_access, &stp->st_access_bmap);
 959         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
 960 }
 961
 962 static void
 963 release_stateid(struct nfs4_stateid *stp, int flags) {
 964
 965         list_del(&stp->st_hash);
 966         list_del_perfile++;
 967         list_del(&stp->st_perfile);
 968         list_del(&stp->st_perfilestate);
 969         if ((stp->st_vfs_set) && (flags & OPEN_STATE)) {
 970                 release_stateid_lockowner(stp);
 971                 nfsd_close(stp->st_vfs_file);
 972                 vfsclose++;
 973         } else if ((stp->st_vfs_set) && (flags & LOCK_STATE)) {
 974                 struct file *filp = stp->st_vfs_file;
 975
 976                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
 977         }
 978         kfree(stp);
 979         stp = NULL;
 980 }
 981
 982 static void
 983 release_file(struct nfs4_file *fp)
 984 {
 985         free_file++;
 986         list_del(&fp->fi_hash);
 987         iput(fp->fi_inode);
 988         kfree(fp);
 989 }
 990
 991 void
 992 move_to_close_lru(struct nfs4_stateowner *sop)
 993 {
 994         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
 995
 996         unhash_stateowner(sop);
 997         list_add_tail(&sop->so_close_lru, &close_lru);
 998         sop->so_time = get_seconds();
 999 }
1000
1001 void
1002 release_state_owner(struct nfs4_stateid *stp, struct nfs4_stateowner **sopp,
1003                 int flag)
1004 {
1005         struct nfs4_stateowner *sop = stp->st_stateowner;
1006         struct nfs4_file *fp = stp->st_file;
1007
1008         dprintk("NFSD: release_state_owner\n");
1009         release_stateid(stp, flag);
1010
1011         /* place unused nfs4_stateowners on so_close_lru list to be
1012          * released by the laundromat service after the lease period
1013          * to enable us to handle CLOSE replay
1014          */
1015         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1016                 move_to_close_lru(sop);
1017         /* unused nfs4_file's are releseed. XXX slab cache? */
1018         if (list_empty(&fp->fi_perfile)) {
1019                 release_file(fp);
1020         }
1021 }
1022
1023 static int
1024 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1025         return ((sop->so_owner.len == owner->len) &&
1026          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1027           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1028 }
1029
1030 /* search ownerstr_hashtbl[] for owner */
1031 static int
1032 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, struct nfs4_stateowner **op) {
1033         struct nfs4_stateowner *local = NULL;
1034
1035         list_for_each_entry(local, &ownerstr_hashtbl[hashval], so_strhash) {
1036                 if (!cmp_owner_str(local, &open->op_owner, &open->op_clientid))
1037                         continue;
1038                 *op = local;
1039                 return(1);
1040         }
1041         return 0;
1042 }
1043
1044 /* see if clientid is in confirmed hash table */
1045 static int
1046 verify_clientid(struct nfs4_client **client, clientid_t *clid) {
1047
1048         struct nfs4_client *clp;
1049         unsigned int idhashval = clientid_hashval(clid->cl_id);
1050
1051         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1052                 if (!cmp_clid(&clp->cl_clientid, clid))
1053                         continue;
1054                 *client = clp;
1055                 return 1;
1056         }
1057         *client = NULL;
1058         return 0;
1059 }
1060
1061 /* search file_hashtbl[] for file */
1062 static int
1063 find_file(unsigned int hashval, struct inode *ino, struct nfs4_file **fp) {
1064         struct nfs4_file *local = NULL;
1065
1066         list_for_each_entry(local, &file_hashtbl[hashval], fi_hash) {
1067                 if (local->fi_inode == ino) {
1068                         *fp = local;
1069                         return(1);
1070                 }
1071         }
1072         return 0;
1073 }
1074
1075 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1076 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1077
1078 void
1079 set_access(unsigned int *access, unsigned long bmap) {
1080         int i;
1081
1082         *access = 0;
1083         for (i = 1; i < 4; i++) {
1084                 if (test_bit(i, &bmap))
1085                         *access |= i;
1086         }
1087 }
1088
1089 void
1090 set_deny(unsigned int *deny, unsigned long bmap) {
1091         int i;
1092
1093         *deny = 0;
1094         for (i = 0; i < 4; i++) {
1095                 if (test_bit(i, &bmap))
1096                         *deny |= i ;
1097         }
1098 }
1099
1100 static int
1101 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1102         unsigned int access, deny;
1103
1104         set_access(&access, stp->st_access_bmap);
1105         set_deny(&deny, stp->st_deny_bmap);
1106         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1107                 return 0;
1108         return 1;
1109 }
1110
1111 /*
1112  * Called to check deny when READ with all zero stateid or
1113  * WRITE with all zero or all one stateid
1114  */
1115 int
1116 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1117 {
1118         struct inode *ino = current_fh->fh_dentry->d_inode;
1119         unsigned int fi_hashval;
1120         struct nfs4_file *fp;
1121         struct nfs4_stateid *stp;
1122
1123         dprintk("NFSD: nfs4_share_conflict\n");
1124
1125         fi_hashval = file_hashval(ino);
1126         if (find_file(fi_hashval, ino, &fp)) {
1127         /* Search for conflicting share reservations */
1128                 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1129                         if (test_bit(deny_type, &stp->st_deny_bmap) ||
1130                             test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1131                                 return nfserr_share_denied;
1132                 }
1133         }
1134         return nfs_ok;
1135 }
1136
1137 static inline int
1138 nfs4_file_upgrade(struct file *filp, unsigned int share_access)
1139 {
1140 int status;
1141
1142         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1143                 status = get_write_access(filp->f_dentry->d_inode);
1144                 if (status)
1145                         return nfserrno(status);
1146                 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1147         }
1148         return nfs_ok;
1149 }
1150
1151 static inline void
1152 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1153 {
1154         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1155                 put_write_access(filp->f_dentry->d_inode);
1156                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1157         }
1158 }
1159
1160
1161 /*
1162  * nfsd4_process_open1()
1163  *      lookup stateowner.
1164  *              found:
1165  *                      check confirmed
1166  *                              confirmed:
1167  *                                      check seqid
1168  *                              not confirmed:
1169  *                                      delete owner
1170  *                                      create new owner
1171  *              notfound:
1172  *                      verify clientid
1173  *                      create new owner
1174  *
1175  * called with nfs4_lock_state() held.
1176  */
1177 int
1178 nfsd4_process_open1(struct nfsd4_open *open)
1179 {
1180         int status;
1181         clientid_t *clientid = &open->op_clientid;
1182         struct nfs4_client *clp = NULL;
1183         unsigned int strhashval;
1184         struct nfs4_stateowner *sop = NULL;
1185
1186         status = nfserr_inval;
1187         if (!check_name(open->op_owner))
1188                 goto out;
1189
1190         status = nfserr_stale_clientid;
1191         if (STALE_CLIENTID(&open->op_clientid))
1192                 return status;
1193
1194         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1195         if (find_openstateowner_str(strhashval, open, &sop)) {
1196                 open->op_stateowner = sop;
1197                 /* check for replay */
1198                 if (open->op_seqid == sop->so_seqid){
1199                         if (!sop->so_replay.rp_buflen) {
1200                         /*
1201                         * The original OPEN failed in so spectacularly that we
1202                         * don't even have replay data saved!  Therefore, we
1203                         * have no choice but to continue processing
1204                         * this OPEN; presumably, we'll fail again for the same
1205                         * reason.
1206                         */
1207                                 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1208                                 status = NFS_OK;
1209                                 goto renew;
1210                         }
1211                         /* replay: indicate to calling function */
1212                         status = NFSERR_REPLAY_ME;
1213                         return status;
1214                 }
1215                 if (sop->so_confirmed) {
1216                         if (open->op_seqid == sop->so_seqid + 1) {
1217                                 status = nfs_ok;
1218                                 goto renew;
1219                         }
1220                         status = nfserr_bad_seqid;
1221                         goto out;
1222                 }
1223                 /* If we get here, we received and OPEN for an unconfirmed
1224                  * nfs4_stateowner.
1225                  * Since the sequid's are different, purge the
1226                  * existing nfs4_stateowner, and instantiate a new one.
1227                  */
1228                 clp = sop->so_client;
1229                 release_stateowner(sop);
1230                 goto instantiate_new_owner;
1231         }
1232         /* nfs4_stateowner not found.
1233         * verify clientid and instantiate new nfs4_stateowner
1234         * if verify fails this is presumably the result of the
1235         * client's lease expiring.
1236         *
1237         * XXX compare clp->cl_addr with rqstp addr?
1238         */
1239         status = nfserr_expired;
1240         if (!verify_clientid(&clp, clientid))
1241                 goto out;
1242 instantiate_new_owner:
1243         status = nfserr_resource;
1244         if (!(sop = alloc_init_open_stateowner(strhashval, clp, open)))
1245                 goto out;
1246         open->op_stateowner = sop;
1247         status = nfs_ok;
1248 renew:
1249         renew_client(sop->so_client);
1250 out:
1251         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1252                 status = nfserr_reclaim_bad;
1253         return status;
1254 }
1255 /*
1256  * called with nfs4_lock_state() held.
1257  */
1258 int
1259 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1260 {
1261         struct iattr iattr;
1262         struct nfs4_stateowner *sop = open->op_stateowner;
1263         struct nfs4_file *fp = NULL;
1264         struct inode *ino;
1265         unsigned int fi_hashval;
1266         struct nfs4_stateid *stq, *stp = NULL;
1267         int status;
1268
1269         status = nfserr_resource;
1270         if (!sop)
1271                 return status;
1272
1273         ino = current_fh->fh_dentry->d_inode;
1274
1275         status = nfserr_inval;
1276         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1277                 goto out;
1278
1279         fi_hashval = file_hashval(ino);
1280         if (find_file(fi_hashval, ino, &fp)) {
1281                 /* Search for conflicting share reservations */
1282                 status = nfserr_share_denied;
1283                 list_for_each_entry(stq, &fp->fi_perfile, st_perfile) {
1284                         if (stq->st_stateowner == sop) {
1285                                 stp = stq;
1286                                 continue;
1287                         }
1288                         /* ignore lock owners */
1289                         if (stq->st_stateowner->so_is_open_owner == 0)
1290                                 continue;
1291                         if (!test_share(stq,open))
1292                                 goto out;
1293                 }
1294         } else {
1295         /* No nfs4_file found; allocate and init a new one */
1296                 status = nfserr_resource;
1297                 if ((fp = alloc_init_file(fi_hashval, ino)) == NULL)
1298                         goto out;
1299         }
1300
1301         if (!stp) {
1302                 int flags = 0;
1303
1304                 status = nfserr_resource;
1305                 if ((stp = kmalloc(sizeof(struct nfs4_stateid),
1306                                                 GFP_KERNEL)) == NULL)
1307                         goto out;
1308
1309                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1310                         flags = MAY_WRITE;
1311                 else
1312                         flags = MAY_READ;
1313                 if ((status = nfsd_open(rqstp, current_fh,  S_IFREG,
1314                                               flags,
1315                                               &stp->st_vfs_file)) != 0)
1316                         goto out_free;
1317
1318                 vfsopen++;
1319
1320                 init_stateid(stp, fp, sop, open);
1321                 stp->st_vfs_set = 1;
1322         } else {
1323                 /* This is an upgrade of an existing OPEN.
1324                  * OR the incoming share with the existing
1325                  * nfs4_stateid share */
1326                 unsigned int share_access;
1327
1328                 set_access(&share_access, stp->st_access_bmap);
1329                 share_access = ~share_access;
1330                 share_access &= open->op_share_access;
1331
1332                 /* update the struct file */
1333                 if ((status = nfs4_file_upgrade(stp->st_vfs_file, share_access)))
1334                         goto out;
1335                 /* remember the open */
1336                 set_bit(open->op_share_access, &stp->st_access_bmap);
1337                 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1338                 /* bump the stateid */
1339                 update_stateid(&stp->st_stateid);
1340         }
1341         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n\n",
1342                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1343                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1344
1345         if (open->op_truncate) {
1346                 iattr.ia_valid = ATTR_SIZE;
1347                 iattr.ia_size = 0;
1348                 status = nfsd_setattr(rqstp, current_fh, &iattr, 0, (time_t)0);
1349                 if (status)
1350                         goto out;
1351         }
1352         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1353
1354         open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
1355         status = nfs_ok;
1356 out:
1357         if (fp && list_empty(&fp->fi_perfile))
1358                 release_file(fp);
1359
1360         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1361                 if (status)
1362                         status = nfserr_reclaim_bad;
1363                 else {
1364                 /* successful reclaim. so_seqid is decremented because
1365                 * it will be bumped in encode_open
1366                 */
1367                         open->op_stateowner->so_confirmed = 1;
1368                         open->op_stateowner->so_seqid--;
1369                 }
1370         }
1371         /*
1372         * To finish the open response, we just need to set the rflags.
1373         */
1374         open->op_rflags = 0;
1375         if (!open->op_stateowner->so_confirmed)
1376                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1377
1378         return status;
1379 out_free:
1380         kfree(stp);
1381         goto out;
1382 }
1383
1384 static struct work_struct laundromat_work;
1385 static void laundromat_main(void *);
1386 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1387
1388 int
1389 nfsd4_renew(clientid_t *clid)
1390 {
1391         struct nfs4_client *clp;
1392         unsigned int idhashval;
1393         int status;
1394
1395         nfs4_lock_state();
1396         dprintk("process_renew(%08x/%08x): starting\n",
1397                         clid->cl_boot, clid->cl_id);
1398         status = nfserr_stale_clientid;
1399         if (STALE_CLIENTID(clid))
1400                 goto out;
1401         status = nfs_ok;
1402         idhashval = clientid_hashval(clid->cl_id);
1403         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1404                 if (!cmp_clid(&clp->cl_clientid, clid))
1405                         continue;
1406                 renew_client(clp);
1407                 goto out;
1408         }
1409         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1410                 if (!cmp_clid(&clp->cl_clientid, clid))
1411                         continue;
1412                 renew_client(clp);
1413         goto out;
1414         }
1415         /*
1416         * Couldn't find an nfs4_client for this clientid.
1417         * Presumably this is because the client took too long to
1418         * RENEW, so return NFS4ERR_EXPIRED.
1419         */
1420         dprintk("nfsd4_renew: clientid not found!\n");
1421         status = nfserr_expired;
1422 out:
1423         nfs4_unlock_state();
1424         return status;
1425 }
1426
1427 time_t
1428 nfs4_laundromat(void)
1429 {
1430         struct nfs4_client *clp;
1431         struct nfs4_stateowner *sop;
1432         struct list_head *pos, *next;
1433         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1434         time_t t, clientid_val = NFSD_LEASE_TIME;
1435         time_t u, close_val = NFSD_LEASE_TIME;
1436
1437         nfs4_lock_state();
1438
1439         dprintk("NFSD: laundromat service - starting, examining clients\n");
1440         list_for_each_safe(pos, next, &client_lru) {
1441                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1442                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1443                         t = clp->cl_time - cutoff;
1444                         if (clientid_val > t)
1445                                 clientid_val = t;
1446                         break;
1447                 }
1448                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1449                         clp->cl_clientid.cl_id);
1450                 expire_client(clp);
1451         }
1452         list_for_each_safe(pos, next, &close_lru) {
1453                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1454                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1455                         u = sop->so_time - cutoff;
1456                         if (close_val > u)
1457                                 close_val = u;
1458                         break;
1459                 }
1460                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1461                         sop->so_id);
1462                 list_del(&sop->so_close_lru);
1463                 free_stateowner(sop);
1464         }
1465         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1466                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1467         nfs4_unlock_state();
1468         return clientid_val;
1469 }
1470
1471 void
1472 laundromat_main(void *not_used)
1473 {
1474         time_t t;
1475
1476         t = nfs4_laundromat();
1477         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1478         schedule_delayed_work(&laundromat_work, t*HZ);
1479 }
1480
1481 /* search ownerid_hashtbl[] and close_lru for stateid owner
1482  * (stateid->si_stateownerid)
1483  */
1484 struct nfs4_stateowner *
1485 find_openstateowner_id(u32 st_id, int flags) {
1486         struct nfs4_stateowner *local = NULL;
1487
1488         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1489         if (flags & CLOSE_STATE) {
1490                 list_for_each_entry(local, &close_lru, so_close_lru) {
1491                         if (local->so_id == st_id)
1492                                 return local;
1493                 }
1494         }
1495         return NULL;
1496 }
1497
1498 static inline int
1499 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1500 {
1501         return (stp->st_vfs_set == 0 ||
1502                 fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode);
1503 }
1504
1505 static int
1506 STALE_STATEID(stateid_t *stateid)
1507 {
1508         if (stateid->si_boot == boot_time)
1509                 return 0;
1510         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1511                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1512                 stateid->si_generation);
1513         return 1;
1514 }
1515
1516
1517 /*
1518 * Checks for stateid operations
1519 */
1520 int
1521 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct nfs4_stateid **stpp)
1522 {
1523         struct nfs4_stateid *stp;
1524         int status;
1525
1526         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1527                 stateid->si_boot, stateid->si_stateownerid,
1528                 stateid->si_fileid, stateid->si_generation);
1529
1530         *stpp = NULL;
1531
1532         /* STALE STATEID */
1533         status = nfserr_stale_stateid;
1534         if (STALE_STATEID(stateid))
1535                 goto out;
1536
1537         /* BAD STATEID */
1538         status = nfserr_bad_stateid;
1539         if (!(stp = find_stateid(stateid, flags))) {
1540                 dprintk("NFSD: preprocess_stateid_op: no open stateid!\n");
1541                 goto out;
1542         }
1543         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
1544                 dprintk("NFSD: preprocess_stateid_op: fh-stateid mismatch!\n");
1545                 stp->st_vfs_set = 0;
1546                 goto out;
1547         }
1548         if (!stp->st_stateowner->so_confirmed) {
1549                 dprintk("preprocess_stateid_op: lockowner not confirmed yet!\n");
1550                 goto out;
1551         }
1552         if (stateid->si_generation > stp->st_stateid.si_generation) {
1553                 dprintk("preprocess_stateid_op: future stateid?!\n");
1554                 goto out;
1555         }
1556
1557         /* OLD STATEID */
1558         status = nfserr_old_stateid;
1559         if (stateid->si_generation < stp->st_stateid.si_generation) {
1560                 dprintk("preprocess_stateid_op: old stateid!\n");
1561                 goto out;
1562         }
1563         *stpp = stp;
1564         status = nfs_ok;
1565         renew_client(stp->st_stateowner->so_client);
1566 out:
1567         return status;
1568 }
1569
1570
1571 /*
1572  * Checks for sequence id mutating operations.
1573  */
1574 int
1575 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)
1576 {
1577         int status;
1578         struct nfs4_stateid *stp;
1579         struct nfs4_stateowner *sop;
1580
1581         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
1582                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
1583                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1584                 stateid->si_generation);
1585
1586         *stpp = NULL;
1587         *sopp = NULL;
1588
1589         status = nfserr_bad_stateid;
1590         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
1591                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
1592                 goto out;
1593         }
1594
1595         status = nfserr_stale_stateid;
1596         if (STALE_STATEID(stateid))
1597                 goto out;
1598         /*
1599         * We return BAD_STATEID if filehandle doesn't match stateid,
1600         * the confirmed flag is incorrecly set, or the generation
1601         * number is incorrect.
1602         * If there is no entry in the openfile table for this id,
1603         * we can't always return BAD_STATEID;
1604         * this might be a retransmitted CLOSE which has arrived after
1605         * the openfile has been released.
1606         */
1607         if (!(stp = find_stateid(stateid, flags)))
1608                 goto no_nfs4_stateid;
1609
1610         status = nfserr_bad_stateid;
1611
1612         /* for new lock stateowners:
1613          * check that the lock->v.new.open_stateid
1614          * refers to an open stateowner
1615          *
1616          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
1617          * as the open_stateid->st_stateowner->so_client->clientid
1618          */
1619         if (lockclid) {
1620                 struct nfs4_stateowner *sop = stp->st_stateowner;
1621                 struct nfs4_client *clp = sop->so_client;
1622
1623                 if (!sop->so_is_open_owner)
1624                         goto out;
1625                 if (!cmp_clid(&clp->cl_clientid, lockclid))
1626                         goto out;
1627         }
1628
1629         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
1630                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
1631                 stp->st_vfs_set = 0;
1632                 goto out;
1633         }
1634
1635         *stpp = stp;
1636         *sopp = sop = stp->st_stateowner;
1637
1638         /*
1639         *  We now validate the seqid and stateid generation numbers.
1640         *  For the moment, we ignore the possibility of
1641         *  generation number wraparound.
1642         */
1643         if (seqid != sop->so_seqid + 1)
1644                 goto check_replay;
1645
1646         if (sop->so_confirmed) {
1647                 if (flags & CONFIRM) {
1648                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
1649                         goto out;
1650                 }
1651         }
1652         else {
1653                 if (!(flags & CONFIRM)) {
1654                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
1655                         goto out;
1656                 }
1657         }
1658         if (stateid->si_generation > stp->st_stateid.si_generation) {
1659                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
1660                 goto out;
1661         }
1662
1663         status = nfserr_old_stateid;
1664         if (stateid->si_generation < stp->st_stateid.si_generation) {
1665                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
1666                 goto out;
1667         }
1668         /* XXX renew the client lease here */
1669         status = nfs_ok;
1670
1671 out:
1672         return status;
1673
1674 no_nfs4_stateid:
1675
1676         /*
1677         * We determine whether this is a bad stateid or a replay,
1678         * starting by trying to look up the stateowner.
1679         * If stateowner is not found - stateid is bad.
1680         */
1681         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
1682                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
1683                 status = nfserr_bad_stateid;
1684                 goto out;
1685         }
1686         *sopp = sop;
1687
1688 check_replay:
1689         if (seqid == sop->so_seqid) {
1690                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
1691                 /* indicate replay to calling function */
1692                 status = NFSERR_REPLAY_ME;
1693         } else  {
1694                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
1695
1696                 *sopp = NULL;
1697                 status = nfserr_bad_seqid;
1698         }
1699         goto out;
1700 }
1701
1702 /*
1703  * eventually, this will perform an upcall to the 'state daemon' as well as
1704  * set the cl_first_state field.
1705  */
1706 void
1707 first_state(struct nfs4_client *clp)
1708 {
1709         if (!clp->cl_first_state)
1710                 clp->cl_first_state = get_seconds();
1711 }
1712
1713 /*
1714  * nfs4_unlock_state(); called in encode
1715  */
1716 int
1717 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
1718 {
1719         int status;
1720         struct nfs4_stateowner *sop;
1721         struct nfs4_stateid *stp;
1722
1723         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
1724                         (int)current_fh->fh_dentry->d_name.len,
1725                         current_fh->fh_dentry->d_name.name);
1726
1727         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
1728                 goto out;
1729
1730         oc->oc_stateowner = NULL;
1731         nfs4_lock_state();
1732
1733         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
1734                                         &oc->oc_req_stateid,
1735                                         CHECK_FH | CONFIRM | OPEN_STATE,
1736                                         &oc->oc_stateowner, &stp, NULL)))
1737                 goto out;
1738
1739         sop = oc->oc_stateowner;
1740         sop->so_confirmed = 1;
1741         update_stateid(&stp->st_stateid);
1742         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
1743         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
1744                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
1745                          stp->st_stateid.si_boot,
1746                          stp->st_stateid.si_stateownerid,
1747                          stp->st_stateid.si_fileid,
1748                          stp->st_stateid.si_generation);
1749         status = nfs_ok;
1750         first_state(sop->so_client);
1751 out:
1752         return status;
1753 }
1754
1755
1756 /*
1757  * unset all bits in union bitmap (bmap) that
1758  * do not exist in share (from successful OPEN_DOWNGRADE)
1759  */
1760 static void
1761 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
1762 {
1763         int i;
1764         for (i = 1; i < 4; i++) {
1765                 if ((i & access) != i)
1766                         __clear_bit(i, bmap);
1767         }
1768 }
1769
1770 static void
1771 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
1772 {
1773         int i;
1774         for (i = 0; i < 4; i++) {
1775                 if ((i & deny) != i)
1776                         __clear_bit(i, bmap);
1777         }
1778 }
1779
1780 /*
1781  * nfs4_unlock_state(); called in encode
1782  */
1783
1784 int
1785 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
1786 {
1787         int status;
1788         struct nfs4_stateid *stp;
1789         unsigned int share_access;
1790
1791         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
1792                         (int)current_fh->fh_dentry->d_name.len,
1793                         current_fh->fh_dentry->d_name.name);
1794
1795         od->od_stateowner = NULL;
1796         status = nfserr_inval;
1797         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
1798                 goto out;
1799
1800         nfs4_lock_state();
1801         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
1802                                         &od->od_stateid,
1803                                         CHECK_FH | OPEN_STATE,
1804                                         &od->od_stateowner, &stp, NULL)))
1805                 goto out;
1806
1807         status = nfserr_inval;
1808         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
1809                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
1810                         stp->st_access_bmap, od->od_share_access);
1811                 goto out;
1812         }
1813         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
1814                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
1815                         stp->st_deny_bmap, od->od_share_deny);
1816                 goto out;
1817         }
1818         set_access(&share_access, stp->st_access_bmap);
1819         nfs4_file_downgrade(stp->st_vfs_file,
1820                             share_access & ~od->od_share_access);
1821
1822         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
1823         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
1824
1825         update_stateid(&stp->st_stateid);
1826         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
1827         status = nfs_ok;
1828 out:
1829         return status;
1830 }
1831
1832 /*
1833  * nfs4_unlock_state() called after encode
1834  */
1835 int
1836 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
1837 {
1838         int status;
1839         struct nfs4_stateid *stp;
1840
1841         dprintk("NFSD: nfsd4_close on file %.*s\n",
1842                         (int)current_fh->fh_dentry->d_name.len,
1843                         current_fh->fh_dentry->d_name.name);
1844
1845         close->cl_stateowner = NULL;
1846         nfs4_lock_state();
1847         /* check close_lru for replay */
1848         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
1849                                         &close->cl_stateid,
1850                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
1851                                         &close->cl_stateowner, &stp, NULL)))
1852                 goto out;
1853         /*
1854         *  Return success, but first update the stateid.
1855         */
1856         status = nfs_ok;
1857         update_stateid(&stp->st_stateid);
1858         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
1859
1860         /* release_state_owner() calls nfsd_close() if needed */
1861         release_state_owner(stp, &close->cl_stateowner, OPEN_STATE);
1862 out:
1863         return status;
1864 }
1865
1866 /*
1867  * Lock owner state (byte-range locks)
1868  */
1869 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
1870 #define LOCK_HASH_BITS              8
1871 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
1872 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
1873
1874 #define lockownerid_hashval(id) \
1875         ((id) & LOCK_HASH_MASK)
1876 #define lock_ownerstr_hashval(x, clientid, ownername) \
1877         ((file_hashval(x) + (clientid) + opaque_hashval((ownername.data), (ownername.len))) & LOCK_HASH_MASK)
1878
1879 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
1880 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
1881 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
1882
1883 struct nfs4_stateid *
1884 find_stateid(stateid_t *stid, int flags)
1885 {
1886         struct nfs4_stateid *local = NULL;
1887         u32 st_id = stid->si_stateownerid;
1888         u32 f_id = stid->si_fileid;
1889         unsigned int hashval;
1890
1891         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
1892         if ((flags & LOCK_STATE) || (flags & RDWR_STATE)) {
1893                 hashval = stateid_hashval(st_id, f_id);
1894                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
1895                         if ((local->st_stateid.si_stateownerid == st_id) &&
1896                             (local->st_stateid.si_fileid == f_id))
1897                                 return local;
1898                 }
1899         }
1900         if ((flags & OPEN_STATE) || (flags & RDWR_STATE)) {
1901                 hashval = stateid_hashval(st_id, f_id);
1902                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
1903                         if ((local->st_stateid.si_stateownerid == st_id) &&
1904                             (local->st_stateid.si_fileid == f_id))
1905                                 return local;
1906                 }
1907         } else
1908                 printk("NFSD: find_stateid: ERROR: no state flag\n");
1909         return NULL;
1910 }
1911
1912
1913 /*
1914  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
1915  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
1916  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
1917  * locking, this prevents us from being completely protocol-compliant.  The
1918  * real solution to this problem is to start using unsigned file offsets in
1919  * the VFS, but this is a very deep change!
1920  */
1921 static inline void
1922 nfs4_transform_lock_offset(struct file_lock *lock)
1923 {
1924         if (lock->fl_start < 0)
1925                 lock->fl_start = OFFSET_MAX;
1926         if (lock->fl_end < 0)
1927                 lock->fl_end = OFFSET_MAX;
1928 }
1929
1930 int
1931 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
1932 {
1933         struct nfs4_stateowner *local = NULL;
1934         int status = 0;
1935
1936         if (hashval >= LOCK_HASH_SIZE)
1937                 goto out;
1938         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
1939                 if (local == sop) {
1940                         status = 1;
1941                         goto out;
1942                 }
1943         }
1944 out:
1945         return status;
1946 }
1947
1948
1949 static inline void
1950 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
1951 {
1952         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
1953         unsigned int hval = lockownerid_hashval(sop->so_id);
1954
1955         deny->ld_sop = NULL;
1956         if (nfs4_verify_lock_stateowner(sop, hval))
1957                 deny->ld_sop = sop;
1958         deny->ld_start = fl->fl_start;
1959         deny->ld_length = ~(u64)0;
1960         if (fl->fl_end != ~(u64)0)
1961                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
1962         deny->ld_type = NFS4_READ_LT;
1963         if (fl->fl_type != F_RDLCK)
1964                 deny->ld_type = NFS4_WRITE_LT;
1965 }
1966
1967 static struct nfs4_stateowner *
1968 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
1969 {
1970         struct nfs4_stateowner *local = NULL;
1971         int i;
1972
1973         for (i = 0; i < LOCK_HASH_SIZE; i++) {
1974                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
1975                         if (!cmp_owner_str(local, owner, clid))
1976                                 continue;
1977                         return local;
1978                 }
1979         }
1980         return NULL;
1981 }
1982
1983 static int
1984 find_lockstateowner_str(unsigned int hashval, struct xdr_netobj *owner, clientid_t *clid, struct nfs4_stateowner **op) {
1985         struct nfs4_stateowner *local = NULL;
1986
1987         list_for_each_entry(local, &lock_ownerstr_hashtbl[hashval], so_strhash) {
1988                 if (!cmp_owner_str(local, owner, clid))
1989                         continue;
1990                 *op = local;
1991                 return(1);
1992         }
1993         *op = NULL;
1994         return 0;
1995 }
1996
1997 /*
1998  * Alloc a lock owner structure.
1999  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2000  * occured.
2001  *
2002  * strhashval = lock_ownerstr_hashval
2003  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2004  */
2005
2006 static struct nfs4_stateowner *
2007 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2008         struct nfs4_stateowner *sop;
2009         struct nfs4_replay *rp;
2010         unsigned int idhashval;
2011
2012         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2013                 return NULL;
2014         idhashval = lockownerid_hashval(current_ownerid);
2015         INIT_LIST_HEAD(&sop->so_idhash);
2016         INIT_LIST_HEAD(&sop->so_strhash);
2017         INIT_LIST_HEAD(&sop->so_perclient);
2018         INIT_LIST_HEAD(&sop->so_perfilestate);
2019         INIT_LIST_HEAD(&sop->so_perlockowner);
2020         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2021         sop->so_time = 0;
2022         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2023         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2024         list_add(&sop->so_perclient, &clp->cl_perclient);
2025         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2026         add_perclient++;
2027         sop->so_is_open_owner = 0;
2028         sop->so_id = current_ownerid++;
2029         sop->so_client = clp;
2030         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2031         sop->so_confirmed = 1;
2032         rp = &sop->so_replay;
2033         rp->rp_status = NFSERR_SERVERFAULT;
2034         rp->rp_buflen = 0;
2035         rp->rp_buf = rp->rp_ibuf;
2036         alloc_lsowner++;
2037         return sop;
2038 }
2039
2040 struct nfs4_stateid *
2041 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2042 {
2043         struct nfs4_stateid *stp;
2044         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2045
2046         if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2047                                         GFP_KERNEL)) == NULL)
2048                 goto out;
2049         INIT_LIST_HEAD(&stp->st_hash);
2050         INIT_LIST_HEAD(&stp->st_perfile);
2051         INIT_LIST_HEAD(&stp->st_perfilestate);
2052         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2053         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2054         list_add(&stp->st_perfile, &fp->fi_perfile);
2055         list_add_perfile++;
2056         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2057         stp->st_stateowner = sop;
2058         stp->st_file = fp;
2059         stp->st_stateid.si_boot = boot_time;
2060         stp->st_stateid.si_stateownerid = sop->so_id;
2061         stp->st_stateid.si_fileid = fp->fi_id;
2062         stp->st_stateid.si_generation = 0;
2063         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2064         stp->st_vfs_set = open_stp->st_vfs_set;
2065         stp->st_access_bmap = open_stp->st_access_bmap;
2066         stp->st_deny_bmap = open_stp->st_deny_bmap;
2067
2068 out:
2069         return stp;
2070 }
2071
2072 int
2073 check_lock_length(u64 offset, u64 length)
2074 {
2075         return ((length == 0)  || ((length != ~(u64)0) &&
2076              LOFF_OVERFLOW(offset, length)));
2077 }
2078
2079 /*
2080  *  LOCK operation
2081  *
2082  * nfs4_unlock_state(); called in encode
2083  */
2084 int
2085 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2086 {
2087         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2088         struct nfs4_stateid *lock_stp;
2089         struct file *filp;
2090         struct file_lock file_lock;
2091         struct file_lock *conflock;
2092         int status = 0;
2093         unsigned int strhashval;
2094
2095         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2096                 (long long) lock->lk_offset,
2097                 (long long) lock->lk_length);
2098
2099         if (nfs4_in_grace() && !lock->lk_reclaim)
2100                 return nfserr_grace;
2101         if (!nfs4_in_grace() && lock->lk_reclaim)
2102                 return nfserr_no_grace;
2103
2104         if (check_lock_length(lock->lk_offset, lock->lk_length))
2105                  return nfserr_inval;
2106
2107         lock->lk_stateowner = NULL;
2108         nfs4_lock_state();
2109
2110         if (lock->lk_is_new) {
2111         /*
2112          * Client indicates that this is a new lockowner.
2113          * Use open owner and open stateid to create lock owner and lock
2114          * stateid.
2115          */
2116                 struct nfs4_stateid *open_stp = NULL;
2117                 struct nfs4_file *fp;
2118
2119                 status = nfserr_stale_clientid;
2120                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2121                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2122                         goto out;
2123                 }
2124
2125                 /* is the new lock seqid presented by the client zero? */
2126                 status = nfserr_bad_seqid;
2127                 if (lock->v.new.lock_seqid != 0)
2128                         goto out;
2129
2130                 /* validate and update open stateid and open seqid */
2131                 status = nfs4_preprocess_seqid_op(current_fh,
2132                                         lock->lk_new_open_seqid,
2133                                         &lock->lk_new_open_stateid,
2134                                         CHECK_FH | OPEN_STATE,
2135                                         &open_sop, &open_stp,
2136                                         &lock->v.new.clientid);
2137                 if (status) {
2138                         if (lock->lk_reclaim)
2139                                 status = nfserr_reclaim_bad;
2140                         goto out;
2141                 }
2142                 /* create lockowner and lock stateid */
2143                 fp = open_stp->st_file;
2144                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2145                                 open_sop->so_client->cl_clientid.cl_id,
2146                                 lock->v.new.owner);
2147                 /*
2148                  * If we already have this lock owner, the client is in
2149                  * error (or our bookeeping is wrong!)
2150                  * for asking for a 'new lock'.
2151                  */
2152                 status = nfserr_bad_stateid;
2153                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2154                                                 &lock->v.new.clientid);
2155                 if (lock_sop)
2156                         goto out;
2157                 status = nfserr_resource;
2158                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2159                         goto out;
2160                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2161                                                 fp, open_stp)) == NULL) {
2162                         release_stateowner(lock->lk_stateowner);
2163                         goto out;
2164                 }
2165                 /* bump the open seqid used to create the lock */
2166                 open_sop->so_seqid++;
2167         } else {
2168                 /* lock (lock owner + lock stateid) already exists */
2169                 status = nfs4_preprocess_seqid_op(current_fh,
2170                                        lock->lk_old_lock_seqid,
2171                                        &lock->lk_old_lock_stateid,
2172                                        CHECK_FH | LOCK_STATE,
2173                                        &lock->lk_stateowner, &lock_stp, NULL);
2174                 if (status)
2175                         goto out;
2176         }
2177         /* lock->lk_stateowner and lock_stp have been created or found */
2178         filp = lock_stp->st_vfs_file;
2179
2180         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2181                 printk("NFSD: nfsd4_lock: permission denied!\n");
2182                 goto out;
2183         }
2184
2185         locks_init_lock(&file_lock);
2186         switch (lock->lk_type) {
2187                 case NFS4_READ_LT:
2188                 case NFS4_READW_LT:
2189                         file_lock.fl_type = F_RDLCK;
2190                 break;
2191                 case NFS4_WRITE_LT:
2192                 case NFS4_WRITEW_LT:
2193                         file_lock.fl_type = F_WRLCK;
2194                 break;
2195                 default:
2196                         status = nfserr_inval;
2197                 goto out;
2198         }
2199         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2200         file_lock.fl_pid = current->tgid;
2201         file_lock.fl_file = filp;
2202         file_lock.fl_flags = FL_POSIX;
2203
2204         file_lock.fl_start = lock->lk_offset;
2205         if ((lock->lk_length == ~(u64)0) ||
2206                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2207                 file_lock.fl_end = ~(u64)0;
2208         else
2209                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2210         nfs4_transform_lock_offset(&file_lock);
2211
2212         /*
2213         * Try to lock the file in the VFS.
2214         * Note: locks.c uses the BKL to protect the inode's lock list.
2215         */
2216
2217         status = posix_lock_file(filp, &file_lock);
2218         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2219                 file_lock.fl_ops->fl_release_private(&file_lock);
2220         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2221         switch (-status) {
2222         case 0: /* success! */
2223                 update_stateid(&lock_stp->st_stateid);
2224                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2225                                 sizeof(stateid_t));
2226                 goto out;
2227         case (EAGAIN):
2228                 goto conflicting_lock;
2229         case (EDEADLK):
2230                 status = nfserr_deadlock;
2231         default:
2232                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2233                 goto out_destroy_new_stateid;
2234         }
2235
2236 conflicting_lock:
2237         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2238         status = nfserr_denied;
2239         /* XXX There is a race here. Future patch needed to provide
2240          * an atomic posix_lock_and_test_file
2241          */
2242         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2243                 status = nfserr_serverfault;
2244                 goto out;
2245         }
2246         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2247
2248 out_destroy_new_stateid:
2249         if (lock->lk_is_new) {
2250                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2251         /*
2252         * An error encountered after instantiation of the new
2253         * stateid has forced us to destroy it.
2254         */
2255                 if (!seqid_mutating_err(status))
2256                         open_sop->so_seqid--;
2257
2258                 release_state_owner(lock_stp, &lock->lk_stateowner, LOCK_STATE);
2259         }
2260 out:
2261         return status;
2262 }
2263
2264 /*
2265  * LOCKT operation
2266  */
2267 int
2268 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2269 {
2270         struct inode *inode;
2271         struct file file;
2272         struct file_lock file_lock;
2273         struct file_lock *conflicting_lock;
2274         unsigned int strhashval;
2275         int status;
2276
2277         if (nfs4_in_grace())
2278                 return nfserr_grace;
2279
2280         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2281                  return nfserr_inval;
2282
2283         lockt->lt_stateowner = NULL;
2284         nfs4_lock_state();
2285
2286         status = nfserr_stale_clientid;
2287         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2288                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2289                 goto out;
2290         }
2291
2292         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2293                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2294                 if (status == nfserr_symlink)
2295                         status = nfserr_inval;
2296                 goto out;
2297         }
2298
2299         inode = current_fh->fh_dentry->d_inode;
2300         locks_init_lock(&file_lock);
2301         switch (lockt->lt_type) {
2302                 case NFS4_READ_LT:
2303                 case NFS4_READW_LT:
2304                         file_lock.fl_type = F_RDLCK;
2305                 break;
2306                 case NFS4_WRITE_LT:
2307                 case NFS4_WRITEW_LT:
2308                         file_lock.fl_type = F_WRLCK;
2309                 break;
2310                 default:
2311                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2312                         status = nfserr_inval;
2313                 goto out;
2314         }
2315
2316         strhashval = lock_ownerstr_hashval(inode,
2317                         lockt->lt_clientid.cl_id, lockt->lt_owner);
2318
2319         find_lockstateowner_str(strhashval, &lockt->lt_owner,
2320                                         &lockt->lt_clientid,
2321                                         &lockt->lt_stateowner);
2322         if (lockt->lt_stateowner)
2323                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2324         file_lock.fl_pid = current->tgid;
2325         file_lock.fl_flags = FL_POSIX;
2326
2327         file_lock.fl_start = lockt->lt_offset;
2328         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2329                 file_lock.fl_end = ~(u64)0;
2330         else
2331                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2332
2333         nfs4_transform_lock_offset(&file_lock);
2334
2335         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2336          * since LOCKT doesn't require an OPEN, and therefore a struct
2337          * file may not exist, pass posix_test_lock a struct file with
2338          * only the dentry:inode set.
2339          */
2340         memset(&file, 0, sizeof (struct file));
2341         file.f_dentry = current_fh->fh_dentry;
2342
2343         status = nfs_ok;
2344         conflicting_lock = posix_test_lock(&file, &file_lock);
2345         if (conflicting_lock) {
2346                 status = nfserr_denied;
2347                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2348         }
2349 out:
2350         nfs4_unlock_state();
2351         return status;
2352 }
2353
2354 int
2355 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2356 {
2357         struct nfs4_stateid *stp;
2358         struct file *filp = NULL;
2359         struct file_lock file_lock;
2360         int status;
2361
2362         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2363                 (long long) locku->lu_offset,
2364                 (long long) locku->lu_length);
2365
2366         if (check_lock_length(locku->lu_offset, locku->lu_length))
2367                  return nfserr_inval;
2368
2369         locku->lu_stateowner = NULL;
2370         nfs4_lock_state();
2371
2372         if ((status = nfs4_preprocess_seqid_op(current_fh,
2373                                         locku->lu_seqid,
2374                                         &locku->lu_stateid,
2375                                         CHECK_FH | LOCK_STATE,
2376                                         &locku->lu_stateowner, &stp, NULL)))
2377                 goto out;
2378
2379         filp = stp->st_vfs_file;
2380         BUG_ON(!filp);
2381         locks_init_lock(&file_lock);
2382         file_lock.fl_type = F_UNLCK;
2383         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2384         file_lock.fl_pid = current->tgid;
2385         file_lock.fl_file = filp;
2386         file_lock.fl_flags = FL_POSIX;
2387         file_lock.fl_start = locku->lu_offset;
2388
2389         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2390                 file_lock.fl_end = ~(u64)0;
2391         else
2392                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2393         nfs4_transform_lock_offset(&file_lock);
2394
2395         /*
2396         *  Try to unlock the file in the VFS.
2397         */
2398         status = posix_lock_file(filp, &file_lock);
2399         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2400                 file_lock.fl_ops->fl_release_private(&file_lock);
2401         if (status) {
2402                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2403                 goto out_nfserr;
2404         }
2405         /*
2406         * OK, unlock succeeded; the only thing left to do is update the stateid.
2407         */
2408         update_stateid(&stp->st_stateid);
2409         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2410
2411 out:
2412         return status;
2413
2414 out_nfserr:
2415         status = nfserrno(status);
2416         goto out;
2417 }
2418
2419 /*
2420  * returns
2421  *      1: locks held by lockowner
2422  *      0: no locks held by lockowner
2423  */
2424 static int
2425 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2426 {
2427         struct file_lock **flpp;
2428         struct inode *inode = filp->f_dentry->d_inode;
2429         int status = 0;
2430
2431         lock_kernel();
2432         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2433                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2434                         status = 1;
2435                         goto out;
2436         }
2437 out:
2438         unlock_kernel();
2439         return status;
2440 }
2441
2442 int
2443 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2444 {
2445         clientid_t *clid = &rlockowner->rl_clientid;
2446         struct nfs4_stateowner *local = NULL;
2447         struct xdr_netobj *owner = &rlockowner->rl_owner;
2448         int status;
2449
2450         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2451                 clid->cl_boot, clid->cl_id);
2452
2453         /* XXX check for lease expiration */
2454
2455         status = nfserr_stale_clientid;
2456         if (STALE_CLIENTID(clid)) {
2457                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
2458                 return status;
2459         }
2460
2461         nfs4_lock_state();
2462
2463         status = nfs_ok;
2464         local = find_lockstateowner(owner, clid);
2465         if (local) {
2466                 struct nfs4_stateid *stp;
2467
2468                 /* check for any locks held by any stateid
2469                  * associated with the (lock) stateowner */
2470                 status = nfserr_locks_held;
2471                 list_for_each_entry(stp, &local->so_perfilestate,
2472                                 st_perfilestate) {
2473                         if (stp->st_vfs_set) {
2474                                 if (check_for_locks(stp->st_vfs_file, local))
2475                                         goto out;
2476                         }
2477                 }
2478                 /* no locks held by (lock) stateowner */
2479                 status = nfs_ok;
2480                 release_stateowner(local);
2481         }
2482 out:
2483         nfs4_unlock_state();
2484         return status;
2485 }
2486
2487 static inline struct nfs4_client_reclaim *
2488 alloc_reclaim(int namelen)
2489 {
2490         struct nfs4_client_reclaim *crp = NULL;
2491
2492         crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
2493         if (!crp)
2494                 return NULL;
2495         crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
2496         if (!crp->cr_name.data) {
2497                 kfree(crp);
2498                 return NULL;
2499         }
2500         return crp;
2501 }
2502
2503 /*
2504  * failure => all reset bets are off, nfserr_no_grace...
2505  */
2506 static int
2507 nfs4_client_to_reclaim(struct nfs4_client *clp)
2508 {
2509         unsigned int strhashval;
2510         struct nfs4_client_reclaim *crp = NULL;
2511
2512         crp = alloc_reclaim(clp->cl_name.len);
2513         if (!crp)
2514                 return 0;
2515         strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
2516         INIT_LIST_HEAD(&crp->cr_strhash);
2517         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
2518         memcpy(crp->cr_name.data, clp->cl_name.data, clp->cl_name.len);
2519         crp->cr_name.len = clp->cl_name.len;
2520         crp->cr_first_state = clp->cl_first_state;
2521         crp->cr_expired = 0;
2522         return 1;
2523 }
2524
2525 static void
2526 nfs4_release_reclaim(void)
2527 {
2528         struct nfs4_client_reclaim *crp = NULL;
2529         int i;
2530
2531         BUG_ON(!nfs4_reclaim_init);
2532         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
2533                 while (!list_empty(&reclaim_str_hashtbl[i])) {
2534                         crp = list_entry(reclaim_str_hashtbl[i].next,
2535                                         struct nfs4_client_reclaim, cr_strhash);
2536                         list_del(&crp->cr_strhash);
2537                         kfree(crp->cr_name.data);
2538                         kfree(crp);
2539                         reclaim_str_hashtbl_size--;
2540                 }
2541         }
2542         BUG_ON(reclaim_str_hashtbl_size);
2543 }
2544
2545 /*
2546  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
2547 struct nfs4_client_reclaim *
2548 nfs4_find_reclaim_client(clientid_t *clid)
2549 {
2550         unsigned int idhashval = clientid_hashval(clid->cl_id);
2551         unsigned int strhashval;
2552         struct nfs4_client *clp, *client = NULL;
2553         struct nfs4_client_reclaim *crp = NULL;
2554
2555
2556         /* find clientid in conf_id_hashtbl */
2557         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
2558                 if (cmp_clid(&clp->cl_clientid, clid)) {
2559                         client = clp;
2560                         break;
2561                 }
2562         }
2563         if (!client)
2564                 return NULL;
2565
2566         /* find clp->cl_name in reclaim_str_hashtbl */
2567         strhashval = clientstr_hashval(client->cl_name.data,
2568                                       client->cl_name.len);
2569         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
2570                 if (cmp_name(&crp->cr_name, &client->cl_name)) {
2571                         return crp;
2572                 }
2573         }
2574         return NULL;
2575 }
2576
2577 /*
2578 * Called from OPEN. Look for clientid in reclaim list.
2579 */
2580 int
2581 nfs4_check_open_reclaim(clientid_t *clid)
2582 {
2583         struct nfs4_client_reclaim *crp;
2584
2585         if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
2586                 return nfserr_reclaim_bad;
2587         if (crp->cr_expired)
2588                 return nfserr_no_grace;
2589         return nfs_ok;
2590 }
2591
2592
2593 /*
2594  * Start and stop routines
2595  */
2596
2597 void
2598 nfs4_state_init(void)
2599 {
2600         int i;
2601         time_t grace_time;
2602
2603         if (nfs4_init)
2604                 return;
2605         if (!nfs4_reclaim_init) {
2606                 for (i = 0; i < CLIENT_HASH_SIZE; i++)
2607                         INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
2608                 reclaim_str_hashtbl_size = 0;
2609                 nfs4_reclaim_init = 1;
2610         }
2611         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
2612                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
2613                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
2614                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
2615                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
2616         }
2617         for (i = 0; i < FILE_HASH_SIZE; i++) {
2618                 INIT_LIST_HEAD(&file_hashtbl[i]);
2619         }
2620         for (i = 0; i < OWNER_HASH_SIZE; i++) {
2621                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
2622                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
2623         }
2624         for (i = 0; i < STATEID_HASH_SIZE; i++) {
2625                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
2626                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
2627         }
2628         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2629                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
2630                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
2631         }
2632         memset(&zerostateid, 0, sizeof(stateid_t));
2633         memset(&onestateid, ~0, sizeof(stateid_t));
2634
2635         INIT_LIST_HEAD(&close_lru);
2636         INIT_LIST_HEAD(&client_lru);
2637         boot_time = get_seconds();
2638         grace_time = max(old_lease_time, lease_time);
2639         if (reclaim_str_hashtbl_size == 0)
2640                 grace_time = 0;
2641         if (grace_time)
2642                 printk("NFSD: starting %ld-second grace period\n", grace_time);
2643         grace_end = boot_time + grace_time;
2644         INIT_WORK(&laundromat_work,laundromat_main, NULL);
2645         schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
2646         nfs4_init = 1;
2647 }
2648
2649 int
2650 nfs4_in_grace(void)
2651 {
2652         return get_seconds() < grace_end;
2653 }
2654
2655 void
2656 set_no_grace(void)
2657 {
2658         printk("NFSD: ERROR in reboot recovery.  State reclaims will fail.\n");
2659         grace_end = get_seconds();
2660 }
2661
2662 time_t
2663 nfs4_lease_time(void)
2664 {
2665         return lease_time;
2666 }
2667
2668 static void
2669 __nfs4_state_shutdown(void)
2670 {
2671         int i;
2672         struct nfs4_client *clp = NULL;
2673
2674         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
2675                 while (!list_empty(&conf_id_hashtbl[i])) {
2676                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
2677                         expire_client(clp);
2678                 }
2679                 while (!list_empty(&unconf_str_hashtbl[i])) {
2680                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
2681                         expire_client(clp);
2682                 }
2683         }
2684         release_all_files();
2685         cancel_delayed_work(&laundromat_work);
2686         flush_scheduled_work();
2687         nfs4_init = 0;
2688         dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
2689                         list_add_perfile, list_del_perfile);
2690         dprintk("NFSD: add_perclient %d del_perclient %d\n",
2691                         add_perclient, del_perclient);
2692         dprintk("NFSD: alloc_file %d free_file %d\n",
2693                         alloc_file, free_file);
2694         dprintk("NFSD: alloc_sowner %d alloc_lsowner %d free_sowner %d\n",
2695                         alloc_sowner, alloc_lsowner, free_sowner);
2696         dprintk("NFSD: vfsopen %d vfsclose %d\n",
2697                         vfsopen, vfsclose);
2698 }
2699
2700 void
2701 nfs4_state_shutdown(void)
2702 {
2703         nfs4_lock_state();
2704         nfs4_release_reclaim();
2705         __nfs4_state_shutdown();
2706         nfs4_unlock_state();
2707 }
2708
2709 /*
2710  * Called when leasetime is changed.
2711  *
2712  * if nfsd is not started, simply set the global lease.
2713  *
2714  * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
2715  * e.g: boot_time is reset, existing nfs4_client structs are
2716  * used to fill reclaim_str_hashtbl, then all state (except for the
2717  * reclaim_str_hashtbl) is re-initialized.
2718  *
2719  * if the old lease time is greater than the new lease time, the grace
2720  * period needs to be set to the old lease time to allow clients to reclaim
2721  * their state. XXX - we may want to set the grace period == lease time
2722  * after an initial grace period == old lease time
2723  *
2724  * if an error occurs in this process, the new lease is set, but the server
2725  * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
2726  * which means OPEN/LOCK/READ/WRITE will fail during grace period.
2727  *
2728  * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
2729  * OPEN and LOCK reclaims.
2730  */
2731 void
2732 nfs4_reset_lease(time_t leasetime)
2733 {
2734         struct nfs4_client *clp;
2735         int i;
2736
2737         printk("NFSD: New leasetime %ld\n",leasetime);
2738         if (!nfs4_init)
2739                 return;
2740         nfs4_lock_state();
2741         old_lease_time = lease_time;
2742         lease_time = leasetime;
2743
2744         nfs4_release_reclaim();
2745
2746         /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
2747         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
2748                 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
2749                         if (!nfs4_client_to_reclaim(clp)) {
2750                                 nfs4_release_reclaim();
2751                                 goto init_state;
2752                         }
2753                         reclaim_str_hashtbl_size++;
2754                 }
2755         }
2756 init_state:
2757         __nfs4_state_shutdown();
2758         nfs4_state_init();
2759         nfs4_unlock_state();
2760 }
2761