fs/nfsd/nfs4state.c

   1 /*
   2 *  linux/fs/nfsd/nfs4state.c
   3 *
   4 *  Copyright (c) 2001 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson <kandros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 */
  36
  37 #include <linux/param.h>
  38 #include <linux/major.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/sunrpc/svc.h>
  42 #include <linux/nfsd/nfsd.h>
  43 #include <linux/nfsd/cache.h>
  44 #include <linux/mount.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/kthread.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfsd/state.h>
  50 #include <linux/nfsd/xdr4.h>
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 /* Globals */
  55 static time_t lease_time = 90;     /* default lease time */
  56 static time_t user_lease_time = 90;
  57 static time_t boot_time;
  58 static int in_grace = 1;
  59 static u32 current_clientid = 1;
  60 static u32 current_ownerid = 1;
  61 static u32 current_fileid = 1;
  62 static u32 current_delegid = 1;
  63 static u32 nfs4_init;
  64 static stateid_t zerostateid;             /* bits all 0 */
  65 static stateid_t onestateid;              /* bits all 1 */
  66
  67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
  68 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
  69
  70 /* forward declarations */
  71 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  72 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  73 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  74
  75 /* Locking:
  76  *
  77  * client_sema:
  78  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  79  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  80  */
  81 static DECLARE_MUTEX(client_sema);
  82
  83 static kmem_cache_t *stateowner_slab = NULL;
  84 static kmem_cache_t *file_slab = NULL;
  85 static kmem_cache_t *stateid_slab = NULL;
  86 static kmem_cache_t *deleg_slab = NULL;
  87
  88 void
  89 nfs4_lock_state(void)
  90 {
  91         down(&client_sema);
  92 }
  93
  94 void
  95 nfs4_unlock_state(void)
  96 {
  97         up(&client_sema);
  98 }
  99
 100 static inline u32
 101 opaque_hashval(const void *ptr, int nbytes)
 102 {
 103         unsigned char *cptr = (unsigned char *) ptr;
 104
 105         u32 x = 0;
 106         while (nbytes--) {
 107                 x *= 37;
 108                 x += *cptr++;
 109         }
 110         return x;
 111 }
 112
 113 /* forward declarations */
 114 static void release_stateowner(struct nfs4_stateowner *sop);
 115 static void release_stateid(struct nfs4_stateid *stp, int flags);
 116
 117 /*
 118  * Delegation state
 119  */
 120
 121 /* recall_lock protects the del_recall_lru */
 122 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
 123 static struct list_head del_recall_lru;
 124
 125 static void
 126 free_nfs4_file(struct kref *kref)
 127 {
 128         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 129         list_del(&fp->fi_hash);
 130         iput(fp->fi_inode);
 131         kmem_cache_free(file_slab, fp);
 132 }
 133
 134 static inline void
 135 put_nfs4_file(struct nfs4_file *fi)
 136 {
 137         kref_put(&fi->fi_ref, free_nfs4_file);
 138 }
 139
 140 static inline void
 141 get_nfs4_file(struct nfs4_file *fi)
 142 {
 143         kref_get(&fi->fi_ref);
 144 }
 145
 146 static struct nfs4_delegation *
 147 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 148 {
 149         struct nfs4_delegation *dp;
 150         struct nfs4_file *fp = stp->st_file;
 151         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 152
 153         dprintk("NFSD alloc_init_deleg\n");
 154         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 155         if (dp == NULL)
 156                 return dp;
 157         INIT_LIST_HEAD(&dp->dl_del_perfile);
 158         INIT_LIST_HEAD(&dp->dl_del_perclnt);
 159         INIT_LIST_HEAD(&dp->dl_recall_lru);
 160         dp->dl_client = clp;
 161         get_nfs4_file(fp);
 162         dp->dl_file = fp;
 163         dp->dl_flock = NULL;
 164         get_file(stp->st_vfs_file);
 165         dp->dl_vfs_file = stp->st_vfs_file;
 166         dp->dl_type = type;
 167         dp->dl_recall.cbr_dp = NULL;
 168         dp->dl_recall.cbr_ident = cb->cb_ident;
 169         dp->dl_recall.cbr_trunc = 0;
 170         dp->dl_stateid.si_boot = boot_time;
 171         dp->dl_stateid.si_stateownerid = current_delegid++;
 172         dp->dl_stateid.si_fileid = 0;
 173         dp->dl_stateid.si_generation = 0;
 174         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 175         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 176                         current_fh->fh_handle.fh_size);
 177         dp->dl_time = 0;
 178         atomic_set(&dp->dl_count, 1);
 179         list_add(&dp->dl_del_perfile, &fp->fi_delegations);
 180         list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
 181         return dp;
 182 }
 183
 184 void
 185 nfs4_put_delegation(struct nfs4_delegation *dp)
 186 {
 187         if (atomic_dec_and_test(&dp->dl_count)) {
 188                 dprintk("NFSD: freeing dp %p\n",dp);
 189                 put_nfs4_file(dp->dl_file);
 190                 kmem_cache_free(deleg_slab, dp);
 191         }
 192 }
 193
 194 /* Remove the associated file_lock first, then remove the delegation.
 195  * lease_modify() is called to remove the FS_LEASE file_lock from
 196  * the i_flock list, eventually calling nfsd's lock_manager
 197  * fl_release_callback.
 198  */
 199 static void
 200 nfs4_close_delegation(struct nfs4_delegation *dp)
 201 {
 202         struct file *filp = dp->dl_vfs_file;
 203
 204         dprintk("NFSD: close_delegation dp %p\n",dp);
 205         dp->dl_vfs_file = NULL;
 206         /* The following nfsd_close may not actually close the file,
 207          * but we want to remove the lease in any case. */
 208         if (dp->dl_flock)
 209                 setlease(filp, F_UNLCK, &dp->dl_flock);
 210         nfsd_close(filp);
 211 }
 212
 213 /* Called under the state lock. */
 214 static void
 215 unhash_delegation(struct nfs4_delegation *dp)
 216 {
 217         list_del_init(&dp->dl_del_perfile);
 218         list_del_init(&dp->dl_del_perclnt);
 219         spin_lock(&recall_lock);
 220         list_del_init(&dp->dl_recall_lru);
 221         spin_unlock(&recall_lock);
 222         nfs4_close_delegation(dp);
 223         nfs4_put_delegation(dp);
 224 }
 225
 226 /*
 227  * SETCLIENTID state
 228  */
 229
 230 /* Hash tables for nfs4_clientid state */
 231 #define CLIENT_HASH_BITS                 4
 232 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 233 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 234
 235 #define clientid_hashval(id) \
 236         ((id) & CLIENT_HASH_MASK)
 237 #define clientstr_hashval(name) \
 238         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
 239 /*
 240  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 241  * used in reboot/reset lease grace period processing
 242  *
 243  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 244  * setclientid_confirmed info.
 245  *
 246  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 247  * setclientid info.
 248  *
 249  * client_lru holds client queue ordered by nfs4_client.cl_time
 250  * for lease renewal.
 251  *
 252  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 253  * for last close replay.
 254  */
 255 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 256 static int reclaim_str_hashtbl_size = 0;
 257 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 258 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 259 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 260 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 261 static struct list_head client_lru;
 262 static struct list_head close_lru;
 263
 264 static inline void
 265 renew_client(struct nfs4_client *clp)
 266 {
 267         /*
 268         * Move client to the end to the LRU list.
 269         */
 270         dprintk("renewing client (clientid %08x/%08x)\n",
 271                         clp->cl_clientid.cl_boot,
 272                         clp->cl_clientid.cl_id);
 273         list_move_tail(&clp->cl_lru, &client_lru);
 274         clp->cl_time = get_seconds();
 275 }
 276
 277 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 278 static int
 279 STALE_CLIENTID(clientid_t *clid)
 280 {
 281         if (clid->cl_boot == boot_time)
 282                 return 0;
 283         dprintk("NFSD stale clientid (%08x/%08x)\n",
 284                         clid->cl_boot, clid->cl_id);
 285         return 1;
 286 }
 287
 288 /*
 289  * XXX Should we use a slab cache ?
 290  * This type of memory management is somewhat inefficient, but we use it
 291  * anyway since SETCLIENTID is not a common operation.
 292  */
 293 static inline struct nfs4_client *
 294 alloc_client(struct xdr_netobj name)
 295 {
 296         struct nfs4_client *clp;
 297
 298         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 299                 memset(clp, 0, sizeof(*clp));
 300                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 301                         memcpy(clp->cl_name.data, name.data, name.len);
 302                         clp->cl_name.len = name.len;
 303                 }
 304                 else {
 305                         kfree(clp);
 306                         clp = NULL;
 307                 }
 308         }
 309         return clp;
 310 }
 311
 312 static inline void
 313 free_client(struct nfs4_client *clp)
 314 {
 315         if (clp->cl_cred.cr_group_info)
 316                 put_group_info(clp->cl_cred.cr_group_info);
 317         kfree(clp->cl_name.data);
 318         kfree(clp);
 319 }
 320
 321 void
 322 put_nfs4_client(struct nfs4_client *clp)
 323 {
 324         if (atomic_dec_and_test(&clp->cl_count))
 325                 free_client(clp);
 326 }
 327
 328 static void
 329 expire_client(struct nfs4_client *clp)
 330 {
 331         struct nfs4_stateowner *sop;
 332         struct nfs4_delegation *dp;
 333         struct nfs4_callback *cb = &clp->cl_callback;
 334         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 335         struct list_head reaplist;
 336
 337         dprintk("NFSD: expire_client cl_count %d\n",
 338                             atomic_read(&clp->cl_count));
 339
 340         /* shutdown rpc client, ending any outstanding recall rpcs */
 341         if (atomic_read(&cb->cb_set) == 1 && clnt) {
 342                 rpc_shutdown_client(clnt);
 343                 clnt = clp->cl_callback.cb_client = NULL;
 344         }
 345
 346         INIT_LIST_HEAD(&reaplist);
 347         spin_lock(&recall_lock);
 348         while (!list_empty(&clp->cl_del_perclnt)) {
 349                 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
 350                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 351                                 dp->dl_flock);
 352                 list_del_init(&dp->dl_del_perclnt);
 353                 list_move(&dp->dl_recall_lru, &reaplist);
 354         }
 355         spin_unlock(&recall_lock);
 356         while (!list_empty(&reaplist)) {
 357                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 358                 list_del_init(&dp->dl_recall_lru);
 359                 unhash_delegation(dp);
 360         }
 361         list_del(&clp->cl_idhash);
 362         list_del(&clp->cl_strhash);
 363         list_del(&clp->cl_lru);
 364         while (!list_empty(&clp->cl_perclient)) {
 365                 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
 366                 release_stateowner(sop);
 367         }
 368         put_nfs4_client(clp);
 369 }
 370
 371 static struct nfs4_client *
 372 create_client(struct xdr_netobj name, char *recdir) {
 373         struct nfs4_client *clp;
 374
 375         if (!(clp = alloc_client(name)))
 376                 goto out;
 377         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 378         atomic_set(&clp->cl_count, 1);
 379         atomic_set(&clp->cl_callback.cb_set, 0);
 380         clp->cl_callback.cb_parsed = 0;
 381         INIT_LIST_HEAD(&clp->cl_idhash);
 382         INIT_LIST_HEAD(&clp->cl_strhash);
 383         INIT_LIST_HEAD(&clp->cl_perclient);
 384         INIT_LIST_HEAD(&clp->cl_del_perclnt);
 385         INIT_LIST_HEAD(&clp->cl_lru);
 386 out:
 387         return clp;
 388 }
 389
 390 static void
 391 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 392         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 393 }
 394
 395 static void
 396 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 397         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 398         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 399 }
 400
 401 static void
 402 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 403
 404         target->cr_uid = source->cr_uid;
 405         target->cr_gid = source->cr_gid;
 406         target->cr_group_info = source->cr_group_info;
 407         get_group_info(target->cr_group_info);
 408 }
 409
 410 static inline int
 411 same_name(const char *n1, const char *n2) {
 412         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 413 }
 414
 415 static int
 416 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 417         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 418 }
 419
 420 static int
 421 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 422         return((cl1->cl_boot == cl2->cl_boot) &&
 423                 (cl1->cl_id == cl2->cl_id));
 424 }
 425
 426 /* XXX what about NGROUP */
 427 static int
 428 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 429         return(cr1->cr_uid == cr2->cr_uid);
 430
 431 }
 432
 433 static void
 434 gen_clid(struct nfs4_client *clp) {
 435         clp->cl_clientid.cl_boot = boot_time;
 436         clp->cl_clientid.cl_id = current_clientid++;
 437 }
 438
 439 static void
 440 gen_confirm(struct nfs4_client *clp) {
 441         struct timespec         tv;
 442         u32 *                   p;
 443
 444         tv = CURRENT_TIME;
 445         p = (u32 *)clp->cl_confirm.data;
 446         *p++ = tv.tv_sec;
 447         *p++ = tv.tv_nsec;
 448 }
 449
 450 static int
 451 check_name(struct xdr_netobj name) {
 452
 453         if (name.len == 0)
 454                 return 0;
 455         if (name.len > NFS4_OPAQUE_LIMIT) {
 456                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 457                 return 0;
 458         }
 459         return 1;
 460 }
 461
 462 static void
 463 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 464 {
 465         unsigned int idhashval;
 466
 467         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 468         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 469         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 470         list_add_tail(&clp->cl_lru, &client_lru);
 471         clp->cl_time = get_seconds();
 472 }
 473
 474 static void
 475 move_to_confirmed(struct nfs4_client *clp)
 476 {
 477         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 478         unsigned int strhashval;
 479
 480         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 481         list_del_init(&clp->cl_strhash);
 482         list_del_init(&clp->cl_idhash);
 483         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 484         strhashval = clientstr_hashval(clp->cl_recdir);
 485         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 486         renew_client(clp);
 487 }
 488
 489 static struct nfs4_client *
 490 find_confirmed_client(clientid_t *clid)
 491 {
 492         struct nfs4_client *clp;
 493         unsigned int idhashval = clientid_hashval(clid->cl_id);
 494
 495         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 496                 if (cmp_clid(&clp->cl_clientid, clid))
 497                         return clp;
 498         }
 499         return NULL;
 500 }
 501
 502 static struct nfs4_client *
 503 find_unconfirmed_client(clientid_t *clid)
 504 {
 505         struct nfs4_client *clp;
 506         unsigned int idhashval = clientid_hashval(clid->cl_id);
 507
 508         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 509                 if (cmp_clid(&clp->cl_clientid, clid))
 510                         return clp;
 511         }
 512         return NULL;
 513 }
 514
 515 static struct nfs4_client *
 516 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 517 {
 518         struct nfs4_client *clp;
 519
 520         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 521                 if (same_name(clp->cl_recdir, dname))
 522                         return clp;
 523         }
 524         return NULL;
 525 }
 526
 527 static struct nfs4_client *
 528 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 529 {
 530         struct nfs4_client *clp;
 531
 532         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 533                 if (same_name(clp->cl_recdir, dname))
 534                         return clp;
 535         }
 536         return NULL;
 537 }
 538
 539 /* a helper function for parse_callback */
 540 static int
 541 parse_octet(unsigned int *lenp, char **addrp)
 542 {
 543         unsigned int len = *lenp;
 544         char *p = *addrp;
 545         int n = -1;
 546         char c;
 547
 548         for (;;) {
 549                 if (!len)
 550                         break;
 551                 len--;
 552                 c = *p++;
 553                 if (c == '.')
 554                         break;
 555                 if ((c < '0') || (c > '9')) {
 556                         n = -1;
 557                         break;
 558                 }
 559                 if (n < 0)
 560                         n = 0;
 561                 n = (n * 10) + (c - '0');
 562                 if (n > 255) {
 563                         n = -1;
 564                         break;
 565                 }
 566         }
 567         *lenp = len;
 568         *addrp = p;
 569         return n;
 570 }
 571
 572 /* parse and set the setclientid ipv4 callback address */
 573 static int
 574 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 575 {
 576         int temp = 0;
 577         u32 cbaddr = 0;
 578         u16 cbport = 0;
 579         u32 addrlen = addr_len;
 580         char *addr = addr_val;
 581         int i, shift;
 582
 583         /* ipaddress */
 584         shift = 24;
 585         for(i = 4; i > 0  ; i--) {
 586                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 587                         return 0;
 588                 }
 589                 cbaddr |= (temp << shift);
 590                 if (shift > 0)
 591                 shift -= 8;
 592         }
 593         *cbaddrp = cbaddr;
 594
 595         /* port */
 596         shift = 8;
 597         for(i = 2; i > 0  ; i--) {
 598                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 599                         return 0;
 600                 }
 601                 cbport |= (temp << shift);
 602                 if (shift > 0)
 603                         shift -= 8;
 604         }
 605         *cbportp = cbport;
 606         return 1;
 607 }
 608
 609 static void
 610 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 611 {
 612         struct nfs4_callback *cb = &clp->cl_callback;
 613
 614         /* Currently, we only support tcp for the callback channel */
 615         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 616                 goto out_err;
 617
 618         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 619                          &cb->cb_addr, &cb->cb_port)))
 620                 goto out_err;
 621         cb->cb_prog = se->se_callback_prog;
 622         cb->cb_ident = se->se_callback_ident;
 623         cb->cb_parsed = 1;
 624         return;
 625 out_err:
 626         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 627                 "will not receive delegations\n",
 628                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 629
 630         cb->cb_parsed = 0;
 631         return;
 632 }
 633
 634 /*
 635  * RFC 3010 has a complex implmentation description of processing a
 636  * SETCLIENTID request consisting of 5 bullets, labeled as
 637  * CASE0 - CASE4 below.
 638  *
 639  * NOTES:
 640  *      callback information will be processed in a future patch
 641  *
 642  *      an unconfirmed record is added when:
 643  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 644  *      CASE 1: confirmed record found with matching name, principal,
 645  *              verifier, and clientid.
 646  *      CASE 2: confirmed record found with matching name, principal,
 647  *              and there is no unconfirmed record with matching
 648  *              name and principal
 649  *
 650  *      an unconfirmed record is replaced when:
 651  *      CASE 3: confirmed record found with matching name, principal,
 652  *              and an unconfirmed record is found with matching
 653  *              name, principal, and with clientid and
 654  *              confirm that does not match the confirmed record.
 655  *      CASE 4: there is no confirmed record with matching name and
 656  *              principal. there is an unconfirmed record with
 657  *              matching name, principal.
 658  *
 659  *      an unconfirmed record is deleted when:
 660  *      CASE 1: an unconfirmed record that matches input name, verifier,
 661  *              and confirmed clientid.
 662  *      CASE 4: any unconfirmed records with matching name and principal
 663  *              that exist after an unconfirmed record has been replaced
 664  *              as described above.
 665  *
 666  */
 667 int
 668 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 669 {
 670         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 671         struct xdr_netobj       clname = {
 672                 .len = setclid->se_namelen,
 673                 .data = setclid->se_name,
 674         };
 675         nfs4_verifier           clverifier = setclid->se_verf;
 676         unsigned int            strhashval;
 677         struct nfs4_client      *conf, *unconf, *new;
 678         int                     status;
 679         char                    dname[HEXDIR_LEN];
 680
 681         status = nfserr_inval;
 682         if (!check_name(clname))
 683                 goto out;
 684
 685         status = nfs4_make_rec_clidname(dname, &clname);
 686         if (status)
 687                 goto out;
 688
 689         /*
 690          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 691          * We get here on a DRC miss.
 692          */
 693
 694         strhashval = clientstr_hashval(dname);
 695
 696         nfs4_lock_state();
 697         conf = find_confirmed_client_by_str(dname, strhashval);
 698         if (conf) {
 699                 /*
 700                  * CASE 0:
 701                  * clname match, confirmed, different principal
 702                  * or different ip_address
 703                  */
 704                 status = nfserr_clid_inuse;
 705                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
 706                                 || conf->cl_addr != ip_addr) {
 707                         printk("NFSD: setclientid: string in use by client"
 708                         "(clientid %08x/%08x)\n",
 709                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
 710                         goto out;
 711                 }
 712         }
 713         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 714         status = nfserr_resource;
 715         if (!conf) {
 716                 /*
 717                  * CASE 4:
 718                  * placed first, because it is the normal case.
 719                  */
 720                 if (unconf)
 721                         expire_client(unconf);
 722                 new = create_client(clname, dname);
 723                 if (new == NULL)
 724                         goto out;
 725                 copy_verf(new, &clverifier);
 726                 new->cl_addr = ip_addr;
 727                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 728                 gen_clid(new);
 729                 gen_confirm(new);
 730                 gen_callback(new, setclid);
 731                 add_to_unconfirmed(new, strhashval);
 732         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 733                 /*
 734                  * CASE 1:
 735                  * cl_name match, confirmed, principal match
 736                  * verifier match: probable callback update
 737                  *
 738                  * remove any unconfirmed nfs4_client with
 739                  * matching cl_name, cl_verifier, and cl_clientid
 740                  *
 741                  * create and insert an unconfirmed nfs4_client with same
 742                  * cl_name, cl_verifier, and cl_clientid as existing
 743                  * nfs4_client,  but with the new callback info and a
 744                  * new cl_confirm
 745                  */
 746                 if (unconf) {
 747                         /* Note this is removing unconfirmed {*x***},
 748                          * which is stronger than RFC recommended {vxc**}.
 749                          * This has the advantage that there is at most
 750                          * one {*x***} in either list at any time.
 751                          */
 752                         expire_client(unconf);
 753                 }
 754                 new = create_client(clname, dname);
 755                 if (new == NULL)
 756                         goto out;
 757                 copy_verf(new,&conf->cl_verifier);
 758                 new->cl_addr = ip_addr;
 759                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 760                 copy_clid(new, conf);
 761                 gen_confirm(new);
 762                 gen_callback(new, setclid);
 763                 add_to_unconfirmed(new,strhashval);
 764         } else if (!unconf) {
 765                 /*
 766                  * CASE 2:
 767                  * clname match, confirmed, principal match
 768                  * verfier does not match
 769                  * no unconfirmed. create a new unconfirmed nfs4_client
 770                  * using input clverifier, clname, and callback info
 771                  * and generate a new cl_clientid and cl_confirm.
 772                  */
 773                 new = create_client(clname, dname);
 774                 if (new == NULL)
 775                         goto out;
 776                 copy_verf(new,&clverifier);
 777                 new->cl_addr = ip_addr;
 778                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 779                 gen_clid(new);
 780                 gen_confirm(new);
 781                 gen_callback(new, setclid);
 782                 add_to_unconfirmed(new, strhashval);
 783         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 784                 /*
 785                  * CASE3:
 786                  * confirmed found (name, principal match)
 787                  * confirmed verifier does not match input clverifier
 788                  *
 789                  * unconfirmed found (name match)
 790                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 791                  *
 792                  * remove unconfirmed.
 793                  *
 794                  * create an unconfirmed nfs4_client
 795                  * with same cl_name as existing confirmed nfs4_client,
 796                  * but with new callback info, new cl_clientid,
 797                  * new cl_verifier and a new cl_confirm
 798                  */
 799                 expire_client(unconf);
 800                 new = create_client(clname, dname);
 801                 if (new == NULL)
 802                         goto out;
 803                 copy_verf(new,&clverifier);
 804                 new->cl_addr = ip_addr;
 805                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 806                 gen_clid(new);
 807                 gen_confirm(new);
 808                 gen_callback(new, setclid);
 809                 add_to_unconfirmed(new, strhashval);
 810         } else {
 811                 /* No cases hit !!! */
 812                 status = nfserr_inval;
 813                 goto out;
 814
 815         }
 816         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 817         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 818         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 819         status = nfs_ok;
 820 out:
 821         nfs4_unlock_state();
 822         return status;
 823 }
 824
 825
 826 /*
 827  * RFC 3010 has a complex implmentation description of processing a
 828  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 829  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 830  *
 831  * NOTE: callback information will be processed here in a future patch
 832  */
 833 int
 834 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 835 {
 836         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 837         struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
 838         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 839         clientid_t * clid = &setclientid_confirm->sc_clientid;
 840         int status;
 841
 842         if (STALE_CLIENTID(clid))
 843                 return nfserr_stale_clientid;
 844         /*
 845          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 846          * We get here on a DRC miss.
 847          */
 848
 849         nfs4_lock_state();
 850         clp = find_confirmed_client(clid);
 851         if (clp) {
 852                 status = nfserr_clid_inuse;
 853                 if (clp->cl_addr != ip_addr) {
 854                         printk("NFSD: setclientid: string in use by client"
 855                         "(clientid %08x/%08x)\n",
 856                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 857                         goto out;
 858                 }
 859                 conf = clp;
 860         }
 861         clp = find_unconfirmed_client(clid);
 862         if (clp) {
 863                 status = nfserr_clid_inuse;
 864                 if (clp->cl_addr != ip_addr) {
 865                         printk("NFSD: setclientid: string in use by client"
 866                         "(clientid %08x/%08x)\n",
 867                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 868                         goto out;
 869                 }
 870                 unconf = clp;
 871         }
 872         /* CASE 1:
 873         * unconf record that matches input clientid and input confirm.
 874         * conf record that matches input clientid.
 875         * conf  and unconf records match names, verifiers
 876         */
 877         if ((conf && unconf) &&
 878             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 879             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 880             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 881             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 882                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 883                         status = nfserr_clid_inuse;
 884                 else {
 885                         /* XXX: We just turn off callbacks until we can handle
 886                           * change request correctly. */
 887                         clp = conf;
 888                         clp->cl_callback.cb_parsed = 0;
 889                         gen_confirm(clp);
 890                         expire_client(unconf);
 891                         status = nfs_ok;
 892
 893                 }
 894                 goto out;
 895         }
 896         /* CASE 2:
 897          * conf record that matches input clientid.
 898          * if unconf record that matches input clientid, then unconf->cl_name
 899          * or unconf->cl_verifier don't match the conf record.
 900          */
 901         if ((conf && !unconf) ||
 902             ((conf && unconf) &&
 903              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 904               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 905                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 906                         status = nfserr_clid_inuse;
 907                 } else {
 908                         clp = conf;
 909                         status = nfs_ok;
 910                 }
 911                 goto out;
 912         }
 913         /* CASE 3:
 914          * conf record not found.
 915          * unconf record found.
 916          * unconf->cl_confirm matches input confirm
 917          */
 918         if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
 919                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 920                         status = nfserr_clid_inuse;
 921                 } else {
 922                         unsigned int hash =
 923                                 clientstr_hashval(unconf->cl_recdir);
 924                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 925                                                                         hash);
 926                         if (conf) {
 927                                 expire_client(conf);
 928                         }
 929                         clp = unconf;
 930                         move_to_confirmed(unconf);
 931                         status = nfs_ok;
 932                 }
 933                 goto out;
 934         }
 935         /* CASE 4:
 936          * conf record not found, or if conf, then conf->cl_confirm does not
 937          * match input confirm.
 938          * unconf record not found, or if unconf, then unconf->cl_confirm
 939          * does not match input confirm.
 940          */
 941         if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
 942             (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
 943                 status = nfserr_stale_clientid;
 944                 goto out;
 945         }
 946         /* check that we have hit one of the cases...*/
 947         status = nfserr_clid_inuse;
 948         goto out;
 949 out:
 950         if (!status)
 951                 nfsd4_probe_callback(clp);
 952         nfs4_unlock_state();
 953         return status;
 954 }
 955
 956 /*
 957  * Open owner state (share locks)
 958  */
 959
 960 /* hash tables for nfs4_stateowner */
 961 #define OWNER_HASH_BITS              8
 962 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 963 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 964
 965 #define ownerid_hashval(id) \
 966         ((id) & OWNER_HASH_MASK)
 967 #define ownerstr_hashval(clientid, ownername) \
 968         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 969
 970 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 971 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 972
 973 /* hash table for nfs4_file */
 974 #define FILE_HASH_BITS                   8
 975 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 976 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 977 /* hash table for (open)nfs4_stateid */
 978 #define STATEID_HASH_BITS              10
 979 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 980 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 981
 982 #define file_hashval(x) \
 983         hash_ptr(x, FILE_HASH_BITS)
 984 #define stateid_hashval(owner_id, file_id)  \
 985         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 986
 987 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 988 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 989
 990 /* OPEN Share state helper functions */
 991 static inline struct nfs4_file *
 992 alloc_init_file(struct inode *ino)
 993 {
 994         struct nfs4_file *fp;
 995         unsigned int hashval = file_hashval(ino);
 996
 997         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 998         if (fp) {
 999                 kref_init(&fp->fi_ref);
1000                 INIT_LIST_HEAD(&fp->fi_hash);
1001                 INIT_LIST_HEAD(&fp->fi_stateids);
1002                 INIT_LIST_HEAD(&fp->fi_delegations);
1003                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1004                 fp->fi_inode = igrab(ino);
1005                 fp->fi_id = current_fileid++;
1006                 return fp;
1007         }
1008         return NULL;
1009 }
1010
1011 static void
1012 nfsd4_free_slab(kmem_cache_t **slab)
1013 {
1014         int status;
1015
1016         if (*slab == NULL)
1017                 return;
1018         status = kmem_cache_destroy(*slab);
1019         *slab = NULL;
1020         WARN_ON(status);
1021 }
1022
1023 static void
1024 nfsd4_free_slabs(void)
1025 {
1026         nfsd4_free_slab(&stateowner_slab);
1027         nfsd4_free_slab(&file_slab);
1028         nfsd4_free_slab(&stateid_slab);
1029         nfsd4_free_slab(&deleg_slab);
1030 }
1031
1032 static int
1033 nfsd4_init_slabs(void)
1034 {
1035         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1036                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1037         if (stateowner_slab == NULL)
1038                 goto out_nomem;
1039         file_slab = kmem_cache_create("nfsd4_files",
1040                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1041         if (file_slab == NULL)
1042                 goto out_nomem;
1043         stateid_slab = kmem_cache_create("nfsd4_stateids",
1044                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1045         if (stateid_slab == NULL)
1046                 goto out_nomem;
1047         deleg_slab = kmem_cache_create("nfsd4_delegations",
1048                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1049         if (deleg_slab == NULL)
1050                 goto out_nomem;
1051         return 0;
1052 out_nomem:
1053         nfsd4_free_slabs();
1054         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1055         return -ENOMEM;
1056 }
1057
1058 void
1059 nfs4_free_stateowner(struct kref *kref)
1060 {
1061         struct nfs4_stateowner *sop =
1062                 container_of(kref, struct nfs4_stateowner, so_ref);
1063         kfree(sop->so_owner.data);
1064         kmem_cache_free(stateowner_slab, sop);
1065 }
1066
1067 static inline struct nfs4_stateowner *
1068 alloc_stateowner(struct xdr_netobj *owner)
1069 {
1070         struct nfs4_stateowner *sop;
1071
1072         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1073                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1074                         memcpy(sop->so_owner.data, owner->data, owner->len);
1075                         sop->so_owner.len = owner->len;
1076                         kref_init(&sop->so_ref);
1077                         return sop;
1078                 }
1079                 kmem_cache_free(stateowner_slab, sop);
1080         }
1081         return NULL;
1082 }
1083
1084 static struct nfs4_stateowner *
1085 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1086         struct nfs4_stateowner *sop;
1087         struct nfs4_replay *rp;
1088         unsigned int idhashval;
1089
1090         if (!(sop = alloc_stateowner(&open->op_owner)))
1091                 return NULL;
1092         idhashval = ownerid_hashval(current_ownerid);
1093         INIT_LIST_HEAD(&sop->so_idhash);
1094         INIT_LIST_HEAD(&sop->so_strhash);
1095         INIT_LIST_HEAD(&sop->so_perclient);
1096         INIT_LIST_HEAD(&sop->so_perfilestate);
1097         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
1098         INIT_LIST_HEAD(&sop->so_close_lru);
1099         sop->so_time = 0;
1100         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1101         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1102         list_add(&sop->so_perclient, &clp->cl_perclient);
1103         sop->so_is_open_owner = 1;
1104         sop->so_id = current_ownerid++;
1105         sop->so_client = clp;
1106         sop->so_seqid = open->op_seqid;
1107         sop->so_confirmed = 0;
1108         rp = &sop->so_replay;
1109         rp->rp_status = NFSERR_SERVERFAULT;
1110         rp->rp_buflen = 0;
1111         rp->rp_buf = rp->rp_ibuf;
1112         return sop;
1113 }
1114
1115 static void
1116 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1117 {
1118         struct nfs4_stateowner *lock_sop;
1119
1120         while (!list_empty(&open_stp->st_perlockowner)) {
1121                 lock_sop = list_entry(open_stp->st_perlockowner.next,
1122                                 struct nfs4_stateowner, so_perlockowner);
1123                 /* list_del(&open_stp->st_perlockowner);  */
1124                 BUG_ON(lock_sop->so_is_open_owner);
1125                 release_stateowner(lock_sop);
1126         }
1127 }
1128
1129 static void
1130 unhash_stateowner(struct nfs4_stateowner *sop)
1131 {
1132         struct nfs4_stateid *stp;
1133
1134         list_del(&sop->so_idhash);
1135         list_del(&sop->so_strhash);
1136         if (sop->so_is_open_owner)
1137                 list_del(&sop->so_perclient);
1138         list_del(&sop->so_perlockowner);
1139         while (!list_empty(&sop->so_perfilestate)) {
1140                 stp = list_entry(sop->so_perfilestate.next,
1141                         struct nfs4_stateid, st_perfilestate);
1142                 if (sop->so_is_open_owner)
1143                         release_stateid(stp, OPEN_STATE);
1144                 else
1145                         release_stateid(stp, LOCK_STATE);
1146         }
1147 }
1148
1149 static void
1150 release_stateowner(struct nfs4_stateowner *sop)
1151 {
1152         unhash_stateowner(sop);
1153         list_del(&sop->so_close_lru);
1154         nfs4_put_stateowner(sop);
1155 }
1156
1157 static inline void
1158 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1159         struct nfs4_stateowner *sop = open->op_stateowner;
1160         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1161
1162         INIT_LIST_HEAD(&stp->st_hash);
1163         INIT_LIST_HEAD(&stp->st_perfilestate);
1164         INIT_LIST_HEAD(&stp->st_perlockowner);
1165         INIT_LIST_HEAD(&stp->st_perfile);
1166         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1167         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1168         list_add(&stp->st_perfile, &fp->fi_stateids);
1169         stp->st_stateowner = sop;
1170         get_nfs4_file(fp);
1171         stp->st_file = fp;
1172         stp->st_stateid.si_boot = boot_time;
1173         stp->st_stateid.si_stateownerid = sop->so_id;
1174         stp->st_stateid.si_fileid = fp->fi_id;
1175         stp->st_stateid.si_generation = 0;
1176         stp->st_access_bmap = 0;
1177         stp->st_deny_bmap = 0;
1178         __set_bit(open->op_share_access, &stp->st_access_bmap);
1179         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1180 }
1181
1182 static void
1183 release_stateid(struct nfs4_stateid *stp, int flags)
1184 {
1185         struct file *filp = stp->st_vfs_file;
1186
1187         list_del(&stp->st_hash);
1188         list_del(&stp->st_perfile);
1189         list_del(&stp->st_perfilestate);
1190         if (flags & OPEN_STATE) {
1191                 release_stateid_lockowners(stp);
1192                 stp->st_vfs_file = NULL;
1193                 nfsd_close(filp);
1194         } else if (flags & LOCK_STATE)
1195                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1196         put_nfs4_file(stp->st_file);
1197         kmem_cache_free(stateid_slab, stp);
1198         stp = NULL;
1199 }
1200
1201 static void
1202 move_to_close_lru(struct nfs4_stateowner *sop)
1203 {
1204         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1205
1206         unhash_stateowner(sop);
1207         list_add_tail(&sop->so_close_lru, &close_lru);
1208         sop->so_time = get_seconds();
1209 }
1210
1211 static void
1212 release_state_owner(struct nfs4_stateid *stp, int flag)
1213 {
1214         struct nfs4_stateowner *sop = stp->st_stateowner;
1215
1216         dprintk("NFSD: release_state_owner\n");
1217         release_stateid(stp, flag);
1218
1219         /* place unused nfs4_stateowners on so_close_lru list to be
1220          * released by the laundromat service after the lease period
1221          * to enable us to handle CLOSE replay
1222          */
1223         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1224                 move_to_close_lru(sop);
1225 }
1226
1227 static int
1228 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1229         return ((sop->so_owner.len == owner->len) &&
1230          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1231           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1232 }
1233
1234 static struct nfs4_stateowner *
1235 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1236 {
1237         struct nfs4_stateowner *so = NULL;
1238
1239         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1240                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1241                         return so;
1242         }
1243         return NULL;
1244 }
1245
1246 /* search file_hashtbl[] for file */
1247 static struct nfs4_file *
1248 find_file(struct inode *ino)
1249 {
1250         unsigned int hashval = file_hashval(ino);
1251         struct nfs4_file *fp;
1252
1253         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1254                 if (fp->fi_inode == ino) {
1255                         get_nfs4_file(fp);
1256                         return fp;
1257                 }
1258         }
1259         return NULL;
1260 }
1261
1262 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1263 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1264
1265 static void
1266 set_access(unsigned int *access, unsigned long bmap) {
1267         int i;
1268
1269         *access = 0;
1270         for (i = 1; i < 4; i++) {
1271                 if (test_bit(i, &bmap))
1272                         *access |= i;
1273         }
1274 }
1275
1276 static void
1277 set_deny(unsigned int *deny, unsigned long bmap) {
1278         int i;
1279
1280         *deny = 0;
1281         for (i = 0; i < 4; i++) {
1282                 if (test_bit(i, &bmap))
1283                         *deny |= i ;
1284         }
1285 }
1286
1287 static int
1288 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1289         unsigned int access, deny;
1290
1291         set_access(&access, stp->st_access_bmap);
1292         set_deny(&deny, stp->st_deny_bmap);
1293         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1294                 return 0;
1295         return 1;
1296 }
1297
1298 /*
1299  * Called to check deny when READ with all zero stateid or
1300  * WRITE with all zero or all one stateid
1301  */
1302 static int
1303 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1304 {
1305         struct inode *ino = current_fh->fh_dentry->d_inode;
1306         struct nfs4_file *fp;
1307         struct nfs4_stateid *stp;
1308         int ret;
1309
1310         dprintk("NFSD: nfs4_share_conflict\n");
1311
1312         fp = find_file(ino);
1313         if (!fp)
1314                 return nfs_ok;
1315         ret = nfserr_share_denied;
1316         /* Search for conflicting share reservations */
1317         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1318                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1319                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1320                         goto out;
1321         }
1322         ret = nfs_ok;
1323 out:
1324         put_nfs4_file(fp);
1325         return ret;
1326 }
1327
1328 static inline void
1329 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1330 {
1331         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1332                 put_write_access(filp->f_dentry->d_inode);
1333                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1334         }
1335 }
1336
1337 /*
1338  * Recall a delegation
1339  */
1340 static int
1341 do_recall(void *__dp)
1342 {
1343         struct nfs4_delegation *dp = __dp;
1344
1345         daemonize("nfsv4-recall");
1346
1347         nfsd4_cb_recall(dp);
1348         return 0;
1349 }
1350
1351 /*
1352  * Spawn a thread to perform a recall on the delegation represented
1353  * by the lease (file_lock)
1354  *
1355  * Called from break_lease() with lock_kernel() held.
1356  * Note: we assume break_lease will only call this *once* for any given
1357  * lease.
1358  */
1359 static
1360 void nfsd_break_deleg_cb(struct file_lock *fl)
1361 {
1362         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1363         struct task_struct *t;
1364
1365         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1366         if (!dp)
1367                 return;
1368
1369         /* We're assuming the state code never drops its reference
1370          * without first removing the lease.  Since we're in this lease
1371          * callback (and since the lease code is serialized by the kernel
1372          * lock) we know the server hasn't removed the lease yet, we know
1373          * it's safe to take a reference: */
1374         atomic_inc(&dp->dl_count);
1375
1376         spin_lock(&recall_lock);
1377         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1378         spin_unlock(&recall_lock);
1379
1380         /* only place dl_time is set. protected by lock_kernel*/
1381         dp->dl_time = get_seconds();
1382
1383         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1384         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1385
1386         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1387         if (IS_ERR(t)) {
1388                 struct nfs4_client *clp = dp->dl_client;
1389
1390                 printk(KERN_INFO "NFSD: Callback thread failed for "
1391                         "for client (clientid %08x/%08x)\n",
1392                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1393                 nfs4_put_delegation(dp);
1394         }
1395 }
1396
1397 /*
1398  * The file_lock is being reapd.
1399  *
1400  * Called by locks_free_lock() with lock_kernel() held.
1401  */
1402 static
1403 void nfsd_release_deleg_cb(struct file_lock *fl)
1404 {
1405         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1406
1407         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1408
1409         if (!(fl->fl_flags & FL_LEASE) || !dp)
1410                 return;
1411         dp->dl_flock = NULL;
1412 }
1413
1414 /*
1415  * Set the delegation file_lock back pointer.
1416  *
1417  * Called from __setlease() with lock_kernel() held.
1418  */
1419 static
1420 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1421 {
1422         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1423
1424         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1425         if (!dp)
1426                 return;
1427         dp->dl_flock = new;
1428 }
1429
1430 /*
1431  * Called from __setlease() with lock_kernel() held
1432  */
1433 static
1434 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1435 {
1436         struct nfs4_delegation *onlistd =
1437                 (struct nfs4_delegation *)onlist->fl_owner;
1438         struct nfs4_delegation *tryd =
1439                 (struct nfs4_delegation *)try->fl_owner;
1440
1441         if (onlist->fl_lmops != try->fl_lmops)
1442                 return 0;
1443
1444         return onlistd->dl_client == tryd->dl_client;
1445 }
1446
1447
1448 static
1449 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1450 {
1451         if (arg & F_UNLCK)
1452                 return lease_modify(onlist, arg);
1453         else
1454                 return -EAGAIN;
1455 }
1456
1457 static struct lock_manager_operations nfsd_lease_mng_ops = {
1458         .fl_break = nfsd_break_deleg_cb,
1459         .fl_release_private = nfsd_release_deleg_cb,
1460         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1461         .fl_mylease = nfsd_same_client_deleg_cb,
1462         .fl_change = nfsd_change_deleg_cb,
1463 };
1464
1465
1466 /*
1467  * nfsd4_process_open1()
1468  *      lookup stateowner.
1469  *              found:
1470  *                      check confirmed
1471  *                              confirmed:
1472  *                                      check seqid
1473  *                              not confirmed:
1474  *                                      delete owner
1475  *                                      create new owner
1476  *              notfound:
1477  *                      verify clientid
1478  *                      create new owner
1479  *
1480  * called with nfs4_lock_state() held.
1481  */
1482 int
1483 nfsd4_process_open1(struct nfsd4_open *open)
1484 {
1485         int status;
1486         clientid_t *clientid = &open->op_clientid;
1487         struct nfs4_client *clp = NULL;
1488         unsigned int strhashval;
1489         struct nfs4_stateowner *sop = NULL;
1490
1491         status = nfserr_inval;
1492         if (!check_name(open->op_owner))
1493                 goto out;
1494
1495         if (STALE_CLIENTID(&open->op_clientid))
1496                 return nfserr_stale_clientid;
1497
1498         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1499         sop = find_openstateowner_str(strhashval, open);
1500         if (sop) {
1501                 open->op_stateowner = sop;
1502                 /* check for replay */
1503                 if (open->op_seqid == sop->so_seqid){
1504                         if (sop->so_replay.rp_buflen)
1505                                 return NFSERR_REPLAY_ME;
1506                         else {
1507                                 /* The original OPEN failed so spectacularly
1508                                  * that we don't even have replay data saved!
1509                                  * Therefore, we have no choice but to continue
1510                                  * processing this OPEN; presumably, we'll
1511                                  * fail again for the same reason.
1512                                  */
1513                                 dprintk("nfsd4_process_open1:"
1514                                         " replay with no replay cache\n");
1515                                 goto renew;
1516                         }
1517                 } else if (sop->so_confirmed) {
1518                         if (open->op_seqid == sop->so_seqid + 1)
1519                                 goto renew;
1520                         status = nfserr_bad_seqid;
1521                         goto out;
1522                 } else {
1523                         /* If we get here, we received an OPEN for an
1524                          * unconfirmed nfs4_stateowner. Since the seqid's are
1525                          * different, purge the existing nfs4_stateowner, and
1526                          * instantiate a new one.
1527                          */
1528                         clp = sop->so_client;
1529                         release_stateowner(sop);
1530                 }
1531         } else {
1532                 /* nfs4_stateowner not found.
1533                  * Verify clientid and instantiate new nfs4_stateowner.
1534                  * If verify fails this is presumably the result of the
1535                  * client's lease expiring.
1536                  */
1537                 status = nfserr_expired;
1538                 clp = find_confirmed_client(clientid);
1539                 if (clp == NULL)
1540                         goto out;
1541         }
1542         status = nfserr_resource;
1543         sop = alloc_init_open_stateowner(strhashval, clp, open);
1544         if (sop == NULL)
1545                 goto out;
1546         open->op_stateowner = sop;
1547 renew:
1548         status = nfs_ok;
1549         renew_client(sop->so_client);
1550 out:
1551         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1552                 status = nfserr_reclaim_bad;
1553         return status;
1554 }
1555
1556 static inline int
1557 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1558 {
1559         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1560                 return nfserr_openmode;
1561         else
1562                 return nfs_ok;
1563 }
1564
1565 static struct nfs4_delegation *
1566 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1567 {
1568         struct nfs4_delegation *dp;
1569
1570         list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
1571                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1572                         return dp;
1573         }
1574         return NULL;
1575 }
1576
1577 static int
1578 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1579                 struct nfs4_delegation **dp)
1580 {
1581         int flags;
1582         int status = nfserr_bad_stateid;
1583
1584         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1585         if (*dp == NULL)
1586                 goto out;
1587         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1588                                                 RD_STATE : WR_STATE;
1589         status = nfs4_check_delegmode(*dp, flags);
1590         if (status)
1591                 *dp = NULL;
1592 out:
1593         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1594                 return nfs_ok;
1595         if (status)
1596                 return status;
1597         open->op_stateowner->so_confirmed = 1;
1598         return nfs_ok;
1599 }
1600
1601 static int
1602 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1603 {
1604         struct nfs4_stateid *local;
1605         int status = nfserr_share_denied;
1606         struct nfs4_stateowner *sop = open->op_stateowner;
1607
1608         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1609                 /* ignore lock owners */
1610                 if (local->st_stateowner->so_is_open_owner == 0)
1611                         continue;
1612                 /* remember if we have seen this open owner */
1613                 if (local->st_stateowner == sop)
1614                         *stpp = local;
1615                 /* check for conflicting share reservations */
1616                 if (!test_share(local, open))
1617                         goto out;
1618         }
1619         status = 0;
1620 out:
1621         return status;
1622 }
1623
1624 static inline struct nfs4_stateid *
1625 nfs4_alloc_stateid(void)
1626 {
1627         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1628 }
1629
1630 static int
1631 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1632                 struct nfs4_delegation *dp,
1633                 struct svc_fh *cur_fh, int flags)
1634 {
1635         struct nfs4_stateid *stp;
1636
1637         stp = nfs4_alloc_stateid();
1638         if (stp == NULL)
1639                 return nfserr_resource;
1640
1641         if (dp) {
1642                 get_file(dp->dl_vfs_file);
1643                 stp->st_vfs_file = dp->dl_vfs_file;
1644         } else {
1645                 int status;
1646                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1647                                 &stp->st_vfs_file);
1648                 if (status) {
1649                         if (status == nfserr_dropit)
1650                                 status = nfserr_jukebox;
1651                         kmem_cache_free(stateid_slab, stp);
1652                         return status;
1653                 }
1654         }
1655         *stpp = stp;
1656         return 0;
1657 }
1658
1659 static inline int
1660 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1661                 struct nfsd4_open *open)
1662 {
1663         struct iattr iattr = {
1664                 .ia_valid = ATTR_SIZE,
1665                 .ia_size = 0,
1666         };
1667         if (!open->op_truncate)
1668                 return 0;
1669         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1670                 return -EINVAL;
1671         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1672 }
1673
1674 static int
1675 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1676 {
1677         struct file *filp = stp->st_vfs_file;
1678         struct inode *inode = filp->f_dentry->d_inode;
1679         unsigned int share_access;
1680         int status;
1681
1682         set_access(&share_access, stp->st_access_bmap);
1683         share_access = ~share_access;
1684         share_access &= open->op_share_access;
1685
1686         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1687                 return nfsd4_truncate(rqstp, cur_fh, open);
1688
1689         status = get_write_access(inode);
1690         if (status)
1691                 return nfserrno(status);
1692         status = nfsd4_truncate(rqstp, cur_fh, open);
1693         if (status) {
1694                 put_write_access(inode);
1695                 return status;
1696         }
1697         /* remember the open */
1698         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1699         set_bit(open->op_share_access, &stp->st_access_bmap);
1700         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1701
1702         return nfs_ok;
1703 }
1704
1705
1706 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1707 static void
1708 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1709 {
1710         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1711                 if (*status)
1712                         *status = nfserr_reclaim_bad;
1713                 else {
1714                         open->op_stateowner->so_confirmed = 1;
1715                         open->op_stateowner->so_seqid--;
1716                 }
1717         }
1718 }
1719
1720 /*
1721  * Attempt to hand out a delegation.
1722  */
1723 static void
1724 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1725 {
1726         struct nfs4_delegation *dp;
1727         struct nfs4_stateowner *sop = stp->st_stateowner;
1728         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1729         struct file_lock fl, *flp = &fl;
1730         int status, flag = 0;
1731
1732         flag = NFS4_OPEN_DELEGATE_NONE;
1733         open->op_recall = 0;
1734         switch (open->op_claim_type) {
1735                 case NFS4_OPEN_CLAIM_PREVIOUS:
1736                         if (!atomic_read(&cb->cb_set))
1737                                 open->op_recall = 1;
1738                         flag = open->op_delegate_type;
1739                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1740                                 goto out;
1741                         break;
1742                 case NFS4_OPEN_CLAIM_NULL:
1743                         /* Let's not give out any delegations till everyone's
1744                          * had the chance to reclaim theirs.... */
1745                         if (nfs4_in_grace())
1746                                 goto out;
1747                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1748                                 goto out;
1749                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1750                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1751                         else
1752                                 flag = NFS4_OPEN_DELEGATE_READ;
1753                         break;
1754                 default:
1755                         goto out;
1756         }
1757
1758         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1759         if (dp == NULL) {
1760                 flag = NFS4_OPEN_DELEGATE_NONE;
1761                 goto out;
1762         }
1763         locks_init_lock(&fl);
1764         fl.fl_lmops = &nfsd_lease_mng_ops;
1765         fl.fl_flags = FL_LEASE;
1766         fl.fl_end = OFFSET_MAX;
1767         fl.fl_owner =  (fl_owner_t)dp;
1768         fl.fl_file = stp->st_vfs_file;
1769         fl.fl_pid = current->tgid;
1770
1771         /* setlease checks to see if delegation should be handed out.
1772          * the lock_manager callbacks fl_mylease and fl_change are used
1773          */
1774         if ((status = setlease(stp->st_vfs_file,
1775                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1776                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1777                 unhash_delegation(dp);
1778                 flag = NFS4_OPEN_DELEGATE_NONE;
1779                 goto out;
1780         }
1781
1782         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1783
1784         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1785                      dp->dl_stateid.si_boot,
1786                      dp->dl_stateid.si_stateownerid,
1787                      dp->dl_stateid.si_fileid,
1788                      dp->dl_stateid.si_generation);
1789 out:
1790         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1791                         && flag == NFS4_OPEN_DELEGATE_NONE
1792                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1793                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1794         open->op_delegate_type = flag;
1795 }
1796
1797 /*
1798  * called with nfs4_lock_state() held.
1799  */
1800 int
1801 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1802 {
1803         struct nfs4_file *fp = NULL;
1804         struct inode *ino = current_fh->fh_dentry->d_inode;
1805         struct nfs4_stateid *stp = NULL;
1806         struct nfs4_delegation *dp = NULL;
1807         int status;
1808
1809         status = nfserr_inval;
1810         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1811                 goto out;
1812         /*
1813          * Lookup file; if found, lookup stateid and check open request,
1814          * and check for delegations in the process of being recalled.
1815          * If not found, create the nfs4_file struct
1816          */
1817         fp = find_file(ino);
1818         if (fp) {
1819                 if ((status = nfs4_check_open(fp, open, &stp)))
1820                         goto out;
1821                 status = nfs4_check_deleg(fp, open, &dp);
1822                 if (status)
1823                         goto out;
1824         } else {
1825                 status = nfserr_bad_stateid;
1826                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1827                         goto out;
1828                 status = nfserr_resource;
1829                 fp = alloc_init_file(ino);
1830                 if (fp == NULL)
1831                         goto out;
1832         }
1833
1834         /*
1835          * OPEN the file, or upgrade an existing OPEN.
1836          * If truncate fails, the OPEN fails.
1837          */
1838         if (stp) {
1839                 /* Stateid was found, this is an OPEN upgrade */
1840                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1841                 if (status)
1842                         goto out;
1843         } else {
1844                 /* Stateid was not found, this is a new OPEN */
1845                 int flags = 0;
1846                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1847                         flags = MAY_WRITE;
1848                 else
1849                         flags = MAY_READ;
1850                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1851                 if (status)
1852                         goto out;
1853                 init_stateid(stp, fp, open);
1854                 status = nfsd4_truncate(rqstp, current_fh, open);
1855                 if (status) {
1856                         release_stateid(stp, OPEN_STATE);
1857                         goto out;
1858                 }
1859         }
1860         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1861
1862         /*
1863         * Attempt to hand out a delegation. No error return, because the
1864         * OPEN succeeds even if we fail.
1865         */
1866         nfs4_open_delegation(current_fh, open, stp);
1867
1868         status = nfs_ok;
1869
1870         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1871                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1872                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1873 out:
1874         if (fp)
1875                 put_nfs4_file(fp);
1876         /* CLAIM_PREVIOUS has different error returns */
1877         nfs4_set_claim_prev(open, &status);
1878         /*
1879         * To finish the open response, we just need to set the rflags.
1880         */
1881         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1882         if (!open->op_stateowner->so_confirmed)
1883                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1884
1885         return status;
1886 }
1887
1888 static struct workqueue_struct *laundry_wq;
1889 static struct work_struct laundromat_work;
1890 static void laundromat_main(void *);
1891 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1892
1893 int
1894 nfsd4_renew(clientid_t *clid)
1895 {
1896         struct nfs4_client *clp;
1897         int status;
1898
1899         nfs4_lock_state();
1900         dprintk("process_renew(%08x/%08x): starting\n",
1901                         clid->cl_boot, clid->cl_id);
1902         status = nfserr_stale_clientid;
1903         if (STALE_CLIENTID(clid))
1904                 goto out;
1905         clp = find_confirmed_client(clid);
1906         status = nfserr_expired;
1907         if (clp == NULL) {
1908                 /* We assume the client took too long to RENEW. */
1909                 dprintk("nfsd4_renew: clientid not found!\n");
1910                 goto out;
1911         }
1912         renew_client(clp);
1913         status = nfserr_cb_path_down;
1914         if (!list_empty(&clp->cl_del_perclnt)
1915                         && !atomic_read(&clp->cl_callback.cb_set))
1916                 goto out;
1917         status = nfs_ok;
1918 out:
1919         nfs4_unlock_state();
1920         return status;
1921 }
1922
1923 static void
1924 end_grace(void)
1925 {
1926         dprintk("NFSD: end of grace period\n");
1927         in_grace = 0;
1928 }
1929
1930 static time_t
1931 nfs4_laundromat(void)
1932 {
1933         struct nfs4_client *clp;
1934         struct nfs4_stateowner *sop;
1935         struct nfs4_delegation *dp;
1936         struct list_head *pos, *next, reaplist;
1937         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1938         time_t t, clientid_val = NFSD_LEASE_TIME;
1939         time_t u, test_val = NFSD_LEASE_TIME;
1940
1941         nfs4_lock_state();
1942
1943         dprintk("NFSD: laundromat service - starting\n");
1944         if (in_grace)
1945                 end_grace();
1946         list_for_each_safe(pos, next, &client_lru) {
1947                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1948                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1949                         t = clp->cl_time - cutoff;
1950                         if (clientid_val > t)
1951                                 clientid_val = t;
1952                         break;
1953                 }
1954                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1955                         clp->cl_clientid.cl_id);
1956                 expire_client(clp);
1957         }
1958         INIT_LIST_HEAD(&reaplist);
1959         spin_lock(&recall_lock);
1960         list_for_each_safe(pos, next, &del_recall_lru) {
1961                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1962                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1963                         u = dp->dl_time - cutoff;
1964                         if (test_val > u)
1965                                 test_val = u;
1966                         break;
1967                 }
1968                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1969                                     dp, dp->dl_flock);
1970                 list_move(&dp->dl_recall_lru, &reaplist);
1971         }
1972         spin_unlock(&recall_lock);
1973         list_for_each_safe(pos, next, &reaplist) {
1974                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1975                 list_del_init(&dp->dl_recall_lru);
1976                 unhash_delegation(dp);
1977         }
1978         test_val = NFSD_LEASE_TIME;
1979         list_for_each_safe(pos, next, &close_lru) {
1980                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1981                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1982                         u = sop->so_time - cutoff;
1983                         if (test_val > u)
1984                                 test_val = u;
1985                         break;
1986                 }
1987                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1988                         sop->so_id);
1989                 list_del(&sop->so_close_lru);
1990                 nfs4_put_stateowner(sop);
1991         }
1992         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1993                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1994         nfs4_unlock_state();
1995         return clientid_val;
1996 }
1997
1998 void
1999 laundromat_main(void *not_used)
2000 {
2001         time_t t;
2002
2003         t = nfs4_laundromat();
2004         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
2005         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
2006 }
2007
2008 /* search ownerid_hashtbl[] and close_lru for stateid owner
2009  * (stateid->si_stateownerid)
2010  */
2011 static struct nfs4_stateowner *
2012 find_openstateowner_id(u32 st_id, int flags) {
2013         struct nfs4_stateowner *local = NULL;
2014
2015         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2016         if (flags & CLOSE_STATE) {
2017                 list_for_each_entry(local, &close_lru, so_close_lru) {
2018                         if (local->so_id == st_id)
2019                                 return local;
2020                 }
2021         }
2022         return NULL;
2023 }
2024
2025 static inline int
2026 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2027 {
2028         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2029 }
2030
2031 static int
2032 STALE_STATEID(stateid_t *stateid)
2033 {
2034         if (stateid->si_boot == boot_time)
2035                 return 0;
2036         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2037                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2038                 stateid->si_generation);
2039         return 1;
2040 }
2041
2042 static inline int
2043 access_permit_read(unsigned long access_bmap)
2044 {
2045         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2046                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2047                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2048 }
2049
2050 static inline int
2051 access_permit_write(unsigned long access_bmap)
2052 {
2053         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2054                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2055 }
2056
2057 static
2058 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2059 {
2060         int status = nfserr_openmode;
2061
2062         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2063                 goto out;
2064         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2065                 goto out;
2066         status = nfs_ok;
2067 out:
2068         return status;
2069 }
2070
2071 static inline int
2072 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2073 {
2074         /* Trying to call delegreturn with a special stateid? Yuch: */
2075         if (!(flags & (RD_STATE | WR_STATE)))
2076                 return nfserr_bad_stateid;
2077         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2078                 return nfs_ok;
2079         else if (nfs4_in_grace()) {
2080                 /* Answer in remaining cases depends on existance of
2081                  * conflicting state; so we must wait out the grace period. */
2082                 return nfserr_grace;
2083         } else if (flags & WR_STATE)
2084                 return nfs4_share_conflict(current_fh,
2085                                 NFS4_SHARE_DENY_WRITE);
2086         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2087                 return nfs4_share_conflict(current_fh,
2088                                 NFS4_SHARE_DENY_READ);
2089 }
2090
2091 /*
2092  * Allow READ/WRITE during grace period on recovered state only for files
2093  * that are not able to provide mandatory locking.
2094  */
2095 static inline int
2096 io_during_grace_disallowed(struct inode *inode, int flags)
2097 {
2098         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2099                 && MANDATORY_LOCK(inode);
2100 }
2101
2102 /*
2103 * Checks for stateid operations
2104 */
2105 int
2106 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2107 {
2108         struct nfs4_stateid *stp = NULL;
2109         struct nfs4_delegation *dp = NULL;
2110         stateid_t *stidp;
2111         struct inode *ino = current_fh->fh_dentry->d_inode;
2112         int status;
2113
2114         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2115                 stateid->si_boot, stateid->si_stateownerid,
2116                 stateid->si_fileid, stateid->si_generation);
2117         if (filpp)
2118                 *filpp = NULL;
2119
2120         if (io_during_grace_disallowed(ino, flags))
2121                 return nfserr_grace;
2122
2123         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2124                 return check_special_stateids(current_fh, stateid, flags);
2125
2126         /* STALE STATEID */
2127         status = nfserr_stale_stateid;
2128         if (STALE_STATEID(stateid))
2129                 goto out;
2130
2131         /* BAD STATEID */
2132         status = nfserr_bad_stateid;
2133         if (!stateid->si_fileid) { /* delegation stateid */
2134                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2135                         dprintk("NFSD: delegation stateid not found\n");
2136                         if (nfs4_in_grace())
2137                                 status = nfserr_grace;
2138                         goto out;
2139                 }
2140                 stidp = &dp->dl_stateid;
2141         } else { /* open or lock stateid */
2142                 if (!(stp = find_stateid(stateid, flags))) {
2143                         dprintk("NFSD: open or lock stateid not found\n");
2144                         if (nfs4_in_grace())
2145                                 status = nfserr_grace;
2146                         goto out;
2147                 }
2148                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2149                         goto out;
2150                 if (!stp->st_stateowner->so_confirmed)
2151                         goto out;
2152                 stidp = &stp->st_stateid;
2153         }
2154         if (stateid->si_generation > stidp->si_generation)
2155                 goto out;
2156
2157         /* OLD STATEID */
2158         status = nfserr_old_stateid;
2159         if (stateid->si_generation < stidp->si_generation)
2160                 goto out;
2161         if (stp) {
2162                 if ((status = nfs4_check_openmode(stp,flags)))
2163                         goto out;
2164                 renew_client(stp->st_stateowner->so_client);
2165                 if (filpp)
2166                         *filpp = stp->st_vfs_file;
2167         } else if (dp) {
2168                 if ((status = nfs4_check_delegmode(dp, flags)))
2169                         goto out;
2170                 renew_client(dp->dl_client);
2171                 if (flags & DELEG_RET)
2172                         unhash_delegation(dp);
2173                 if (filpp)
2174                         *filpp = dp->dl_vfs_file;
2175         }
2176         status = nfs_ok;
2177 out:
2178         return status;
2179 }
2180
2181
2182 /*
2183  * Checks for sequence id mutating operations.
2184  */
2185 static int
2186 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)
2187 {
2188         int status;
2189         struct nfs4_stateid *stp;
2190         struct nfs4_stateowner *sop;
2191
2192         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2193                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2194                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2195                 stateid->si_generation);
2196
2197         *stpp = NULL;
2198         *sopp = NULL;
2199
2200         status = nfserr_bad_stateid;
2201         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2202                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2203                 goto out;
2204         }
2205
2206         status = nfserr_stale_stateid;
2207         if (STALE_STATEID(stateid))
2208                 goto out;
2209         /*
2210         * We return BAD_STATEID if filehandle doesn't match stateid,
2211         * the confirmed flag is incorrecly set, or the generation
2212         * number is incorrect.
2213         * If there is no entry in the openfile table for this id,
2214         * we can't always return BAD_STATEID;
2215         * this might be a retransmitted CLOSE which has arrived after
2216         * the openfile has been released.
2217         */
2218         if (!(stp = find_stateid(stateid, flags)))
2219                 goto no_nfs4_stateid;
2220
2221         status = nfserr_bad_stateid;
2222
2223         /* for new lock stateowners:
2224          * check that the lock->v.new.open_stateid
2225          * refers to an open stateowner
2226          *
2227          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2228          * as the open_stateid->st_stateowner->so_client->clientid
2229          */
2230         if (lockclid) {
2231                 struct nfs4_stateowner *sop = stp->st_stateowner;
2232                 struct nfs4_client *clp = sop->so_client;
2233
2234                 if (!sop->so_is_open_owner)
2235                         goto out;
2236                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2237                         goto out;
2238         }
2239
2240         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2241                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2242                 goto out;
2243         }
2244
2245         *stpp = stp;
2246         *sopp = sop = stp->st_stateowner;
2247
2248         /*
2249         *  We now validate the seqid and stateid generation numbers.
2250         *  For the moment, we ignore the possibility of
2251         *  generation number wraparound.
2252         */
2253         if (seqid != sop->so_seqid + 1)
2254                 goto check_replay;
2255
2256         if (sop->so_confirmed) {
2257                 if (flags & CONFIRM) {
2258                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2259                         goto out;
2260                 }
2261         }
2262         else {
2263                 if (!(flags & CONFIRM)) {
2264                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2265                         goto out;
2266                 }
2267         }
2268         if (stateid->si_generation > stp->st_stateid.si_generation) {
2269                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2270                 goto out;
2271         }
2272
2273         status = nfserr_old_stateid;
2274         if (stateid->si_generation < stp->st_stateid.si_generation) {
2275                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2276                 goto out;
2277         }
2278         /* XXX renew the client lease here */
2279         status = nfs_ok;
2280
2281 out:
2282         return status;
2283
2284 no_nfs4_stateid:
2285
2286         /*
2287         * We determine whether this is a bad stateid or a replay,
2288         * starting by trying to look up the stateowner.
2289         * If stateowner is not found - stateid is bad.
2290         */
2291         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2292                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2293                 status = nfserr_bad_stateid;
2294                 goto out;
2295         }
2296         *sopp = sop;
2297
2298 check_replay:
2299         if (seqid == sop->so_seqid) {
2300                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2301                 /* indicate replay to calling function */
2302                 status = NFSERR_REPLAY_ME;
2303         } else  {
2304                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2305
2306                 *sopp = NULL;
2307                 status = nfserr_bad_seqid;
2308         }
2309         goto out;
2310 }
2311
2312 int
2313 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2314 {
2315         int status;
2316         struct nfs4_stateowner *sop;
2317         struct nfs4_stateid *stp;
2318
2319         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2320                         (int)current_fh->fh_dentry->d_name.len,
2321                         current_fh->fh_dentry->d_name.name);
2322
2323         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2324                 goto out;
2325
2326         nfs4_lock_state();
2327
2328         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2329                                         &oc->oc_req_stateid,
2330                                         CHECK_FH | CONFIRM | OPEN_STATE,
2331                                         &oc->oc_stateowner, &stp, NULL)))
2332                 goto out;
2333
2334         sop = oc->oc_stateowner;
2335         sop->so_confirmed = 1;
2336         update_stateid(&stp->st_stateid);
2337         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2338         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2339                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2340                          stp->st_stateid.si_boot,
2341                          stp->st_stateid.si_stateownerid,
2342                          stp->st_stateid.si_fileid,
2343                          stp->st_stateid.si_generation);
2344 out:
2345         if (oc->oc_stateowner)
2346                 nfs4_get_stateowner(oc->oc_stateowner);
2347         nfs4_unlock_state();
2348         return status;
2349 }
2350
2351
2352 /*
2353  * unset all bits in union bitmap (bmap) that
2354  * do not exist in share (from successful OPEN_DOWNGRADE)
2355  */
2356 static void
2357 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2358 {
2359         int i;
2360         for (i = 1; i < 4; i++) {
2361                 if ((i & access) != i)
2362                         __clear_bit(i, bmap);
2363         }
2364 }
2365
2366 static void
2367 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2368 {
2369         int i;
2370         for (i = 0; i < 4; i++) {
2371                 if ((i & deny) != i)
2372                         __clear_bit(i, bmap);
2373         }
2374 }
2375
2376 int
2377 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2378 {
2379         int status;
2380         struct nfs4_stateid *stp;
2381         unsigned int share_access;
2382
2383         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2384                         (int)current_fh->fh_dentry->d_name.len,
2385                         current_fh->fh_dentry->d_name.name);
2386
2387         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2388                 return nfserr_inval;
2389
2390         nfs4_lock_state();
2391         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2392                                         &od->od_stateid,
2393                                         CHECK_FH | OPEN_STATE,
2394                                         &od->od_stateowner, &stp, NULL)))
2395                 goto out;
2396
2397         status = nfserr_inval;
2398         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2399                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2400                         stp->st_access_bmap, od->od_share_access);
2401                 goto out;
2402         }
2403         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2404                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2405                         stp->st_deny_bmap, od->od_share_deny);
2406                 goto out;
2407         }
2408         set_access(&share_access, stp->st_access_bmap);
2409         nfs4_file_downgrade(stp->st_vfs_file,
2410                             share_access & ~od->od_share_access);
2411
2412         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2413         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2414
2415         update_stateid(&stp->st_stateid);
2416         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2417         status = nfs_ok;
2418 out:
2419         if (od->od_stateowner)
2420                 nfs4_get_stateowner(od->od_stateowner);
2421         nfs4_unlock_state();
2422         return status;
2423 }
2424
2425 /*
2426  * nfs4_unlock_state() called after encode
2427  */
2428 int
2429 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2430 {
2431         int status;
2432         struct nfs4_stateid *stp;
2433
2434         dprintk("NFSD: nfsd4_close on file %.*s\n",
2435                         (int)current_fh->fh_dentry->d_name.len,
2436                         current_fh->fh_dentry->d_name.name);
2437
2438         nfs4_lock_state();
2439         /* check close_lru for replay */
2440         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2441                                         &close->cl_stateid,
2442                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2443                                         &close->cl_stateowner, &stp, NULL)))
2444                 goto out;
2445         /*
2446         *  Return success, but first update the stateid.
2447         */
2448         status = nfs_ok;
2449         update_stateid(&stp->st_stateid);
2450         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2451
2452         /* release_state_owner() calls nfsd_close() if needed */
2453         release_state_owner(stp, OPEN_STATE);
2454 out:
2455         if (close->cl_stateowner)
2456                 nfs4_get_stateowner(close->cl_stateowner);
2457         nfs4_unlock_state();
2458         return status;
2459 }
2460
2461 int
2462 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2463 {
2464         int status;
2465
2466         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2467                 goto out;
2468
2469         nfs4_lock_state();
2470         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2471         nfs4_unlock_state();
2472 out:
2473         return status;
2474 }
2475
2476
2477 /*
2478  * Lock owner state (byte-range locks)
2479  */
2480 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2481 #define LOCK_HASH_BITS              8
2482 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2483 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2484
2485 #define lockownerid_hashval(id) \
2486         ((id) & LOCK_HASH_MASK)
2487
2488 static inline unsigned int
2489 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2490                 struct xdr_netobj *ownername)
2491 {
2492         return (file_hashval(inode) + cl_id
2493                         + opaque_hashval(ownername->data, ownername->len))
2494                 & LOCK_HASH_MASK;
2495 }
2496
2497 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2498 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2499 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2500
2501 static struct nfs4_stateid *
2502 find_stateid(stateid_t *stid, int flags)
2503 {
2504         struct nfs4_stateid *local = NULL;
2505         u32 st_id = stid->si_stateownerid;
2506         u32 f_id = stid->si_fileid;
2507         unsigned int hashval;
2508
2509         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2510         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2511                 hashval = stateid_hashval(st_id, f_id);
2512                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2513                         if ((local->st_stateid.si_stateownerid == st_id) &&
2514                             (local->st_stateid.si_fileid == f_id))
2515                                 return local;
2516                 }
2517         }
2518         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2519                 hashval = stateid_hashval(st_id, f_id);
2520                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2521                         if ((local->st_stateid.si_stateownerid == st_id) &&
2522                             (local->st_stateid.si_fileid == f_id))
2523                                 return local;
2524                 }
2525         } else
2526                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2527         return NULL;
2528 }
2529
2530 static struct nfs4_delegation *
2531 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2532 {
2533         struct nfs4_file *fp;
2534         struct nfs4_delegation *dl;
2535
2536         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2537                     stid->si_boot, stid->si_stateownerid,
2538                     stid->si_fileid, stid->si_generation);
2539
2540         fp = find_file(ino);
2541         if (!fp)
2542                 return NULL;
2543         dl = find_delegation_file(fp, stid);
2544         put_nfs4_file(fp);
2545         return dl;
2546 }
2547
2548 /*
2549  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2550  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2551  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2552  * locking, this prevents us from being completely protocol-compliant.  The
2553  * real solution to this problem is to start using unsigned file offsets in
2554  * the VFS, but this is a very deep change!
2555  */
2556 static inline void
2557 nfs4_transform_lock_offset(struct file_lock *lock)
2558 {
2559         if (lock->fl_start < 0)
2560                 lock->fl_start = OFFSET_MAX;
2561         if (lock->fl_end < 0)
2562                 lock->fl_end = OFFSET_MAX;
2563 }
2564
2565 static int
2566 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2567 {
2568         struct nfs4_stateowner *local = NULL;
2569         int status = 0;
2570
2571         if (hashval >= LOCK_HASH_SIZE)
2572                 goto out;
2573         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2574                 if (local == sop) {
2575                         status = 1;
2576                         goto out;
2577                 }
2578         }
2579 out:
2580         return status;
2581 }
2582
2583
2584 static inline void
2585 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2586 {
2587         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2588         unsigned int hval = lockownerid_hashval(sop->so_id);
2589
2590         deny->ld_sop = NULL;
2591         if (nfs4_verify_lock_stateowner(sop, hval)) {
2592                 kref_get(&sop->so_ref);
2593                 deny->ld_sop = sop;
2594                 deny->ld_clientid = sop->so_client->cl_clientid;
2595         }
2596         deny->ld_start = fl->fl_start;
2597         deny->ld_length = ~(u64)0;
2598         if (fl->fl_end != ~(u64)0)
2599                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2600         deny->ld_type = NFS4_READ_LT;
2601         if (fl->fl_type != F_RDLCK)
2602                 deny->ld_type = NFS4_WRITE_LT;
2603 }
2604
2605 static struct nfs4_stateowner *
2606 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2607 {
2608         struct nfs4_stateowner *local = NULL;
2609         int i;
2610
2611         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2612                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2613                         if (!cmp_owner_str(local, owner, clid))
2614                                 continue;
2615                         return local;
2616                 }
2617         }
2618         return NULL;
2619 }
2620
2621 static struct nfs4_stateowner *
2622 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2623                 struct xdr_netobj *owner)
2624 {
2625         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2626         struct nfs4_stateowner *op;
2627
2628         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2629                 if (cmp_owner_str(op, owner, clid))
2630                         return op;
2631         }
2632         return NULL;
2633 }
2634
2635 /*
2636  * Alloc a lock owner structure.
2637  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2638  * occured.
2639  *
2640  * strhashval = lock_ownerstr_hashval
2641  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2642  */
2643
2644 static struct nfs4_stateowner *
2645 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2646         struct nfs4_stateowner *sop;
2647         struct nfs4_replay *rp;
2648         unsigned int idhashval;
2649
2650         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2651                 return NULL;
2652         idhashval = lockownerid_hashval(current_ownerid);
2653         INIT_LIST_HEAD(&sop->so_idhash);
2654         INIT_LIST_HEAD(&sop->so_strhash);
2655         INIT_LIST_HEAD(&sop->so_perclient);
2656         INIT_LIST_HEAD(&sop->so_perfilestate);
2657         INIT_LIST_HEAD(&sop->so_perlockowner);
2658         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2659         sop->so_time = 0;
2660         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2661         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2662         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2663         sop->so_is_open_owner = 0;
2664         sop->so_id = current_ownerid++;
2665         sop->so_client = clp;
2666         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2667         sop->so_confirmed = 1;
2668         rp = &sop->so_replay;
2669         rp->rp_status = NFSERR_SERVERFAULT;
2670         rp->rp_buflen = 0;
2671         rp->rp_buf = rp->rp_ibuf;
2672         return sop;
2673 }
2674
2675 static struct nfs4_stateid *
2676 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2677 {
2678         struct nfs4_stateid *stp;
2679         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2680
2681         stp = nfs4_alloc_stateid();
2682         if (stp == NULL)
2683                 goto out;
2684         INIT_LIST_HEAD(&stp->st_hash);
2685         INIT_LIST_HEAD(&stp->st_perfile);
2686         INIT_LIST_HEAD(&stp->st_perfilestate);
2687         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2688         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2689         list_add(&stp->st_perfile, &fp->fi_stateids);
2690         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2691         stp->st_stateowner = sop;
2692         get_nfs4_file(fp);
2693         stp->st_file = fp;
2694         stp->st_stateid.si_boot = boot_time;
2695         stp->st_stateid.si_stateownerid = sop->so_id;
2696         stp->st_stateid.si_fileid = fp->fi_id;
2697         stp->st_stateid.si_generation = 0;
2698         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2699         stp->st_access_bmap = open_stp->st_access_bmap;
2700         stp->st_deny_bmap = open_stp->st_deny_bmap;
2701
2702 out:
2703         return stp;
2704 }
2705
2706 static int
2707 check_lock_length(u64 offset, u64 length)
2708 {
2709         return ((length == 0)  || ((length != ~(u64)0) &&
2710              LOFF_OVERFLOW(offset, length)));
2711 }
2712
2713 /*
2714  *  LOCK operation
2715  */
2716 int
2717 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2718 {
2719         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2720         struct nfs4_stateid *lock_stp;
2721         struct file *filp;
2722         struct file_lock file_lock;
2723         struct file_lock *conflock;
2724         int status = 0;
2725         unsigned int strhashval;
2726
2727         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2728                 (long long) lock->lk_offset,
2729                 (long long) lock->lk_length);
2730
2731         if (nfs4_in_grace() && !lock->lk_reclaim)
2732                 return nfserr_grace;
2733         if (!nfs4_in_grace() && lock->lk_reclaim)
2734                 return nfserr_no_grace;
2735
2736         if (check_lock_length(lock->lk_offset, lock->lk_length))
2737                  return nfserr_inval;
2738
2739         nfs4_lock_state();
2740
2741         if (lock->lk_is_new) {
2742         /*
2743          * Client indicates that this is a new lockowner.
2744          * Use open owner and open stateid to create lock owner and lock
2745          * stateid.
2746          */
2747                 struct nfs4_stateid *open_stp = NULL;
2748                 struct nfs4_file *fp;
2749
2750                 status = nfserr_stale_clientid;
2751                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2752                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2753                         goto out;
2754                 }
2755
2756                 /* is the new lock seqid presented by the client zero? */
2757                 status = nfserr_bad_seqid;
2758                 if (lock->v.new.lock_seqid != 0)
2759                         goto out;
2760
2761                 /* validate and update open stateid and open seqid */
2762                 status = nfs4_preprocess_seqid_op(current_fh,
2763                                         lock->lk_new_open_seqid,
2764                                         &lock->lk_new_open_stateid,
2765                                         CHECK_FH | OPEN_STATE,
2766                                         &open_sop, &open_stp,
2767                                         &lock->v.new.clientid);
2768                 if (status) {
2769                         if (lock->lk_reclaim)
2770                                 status = nfserr_reclaim_bad;
2771                         goto out;
2772                 }
2773                 /* create lockowner and lock stateid */
2774                 fp = open_stp->st_file;
2775                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2776                                 open_sop->so_client->cl_clientid.cl_id,
2777                                 &lock->v.new.owner);
2778                 /*
2779                  * If we already have this lock owner, the client is in
2780                  * error (or our bookeeping is wrong!)
2781                  * for asking for a 'new lock'.
2782                  */
2783                 status = nfserr_bad_stateid;
2784                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2785                                                 &lock->v.new.clientid);
2786                 if (lock_sop)
2787                         goto out;
2788                 status = nfserr_resource;
2789                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2790                         goto out;
2791                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2792                                                 fp, open_stp)) == NULL) {
2793                         release_stateowner(lock->lk_stateowner);
2794                         lock->lk_stateowner = NULL;
2795                         goto out;
2796                 }
2797                 /* bump the open seqid used to create the lock */
2798                 open_sop->so_seqid++;
2799         } else {
2800                 /* lock (lock owner + lock stateid) already exists */
2801                 status = nfs4_preprocess_seqid_op(current_fh,
2802                                        lock->lk_old_lock_seqid,
2803                                        &lock->lk_old_lock_stateid,
2804                                        CHECK_FH | LOCK_STATE,
2805                                        &lock->lk_stateowner, &lock_stp, NULL);
2806                 if (status)
2807                         goto out;
2808         }
2809         /* lock->lk_stateowner and lock_stp have been created or found */
2810         filp = lock_stp->st_vfs_file;
2811
2812         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2813                 printk("NFSD: nfsd4_lock: permission denied!\n");
2814                 goto out;
2815         }
2816
2817         locks_init_lock(&file_lock);
2818         switch (lock->lk_type) {
2819                 case NFS4_READ_LT:
2820                 case NFS4_READW_LT:
2821                         file_lock.fl_type = F_RDLCK;
2822                 break;
2823                 case NFS4_WRITE_LT:
2824                 case NFS4_WRITEW_LT:
2825                         file_lock.fl_type = F_WRLCK;
2826                 break;
2827                 default:
2828                         status = nfserr_inval;
2829                 goto out;
2830         }
2831         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2832         file_lock.fl_pid = current->tgid;
2833         file_lock.fl_file = filp;
2834         file_lock.fl_flags = FL_POSIX;
2835
2836         file_lock.fl_start = lock->lk_offset;
2837         if ((lock->lk_length == ~(u64)0) ||
2838                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2839                 file_lock.fl_end = ~(u64)0;
2840         else
2841                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2842         nfs4_transform_lock_offset(&file_lock);
2843
2844         /*
2845         * Try to lock the file in the VFS.
2846         * Note: locks.c uses the BKL to protect the inode's lock list.
2847         */
2848
2849         status = posix_lock_file(filp, &file_lock);
2850         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2851                 file_lock.fl_ops->fl_release_private(&file_lock);
2852         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2853         switch (-status) {
2854         case 0: /* success! */
2855                 update_stateid(&lock_stp->st_stateid);
2856                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2857                                 sizeof(stateid_t));
2858                 goto out;
2859         case (EAGAIN):
2860                 goto conflicting_lock;
2861         case (EDEADLK):
2862                 status = nfserr_deadlock;
2863         default:
2864                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2865                 goto out_destroy_new_stateid;
2866         }
2867
2868 conflicting_lock:
2869         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2870         status = nfserr_denied;
2871         /* XXX There is a race here. Future patch needed to provide
2872          * an atomic posix_lock_and_test_file
2873          */
2874         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2875                 status = nfserr_serverfault;
2876                 goto out;
2877         }
2878         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2879
2880 out_destroy_new_stateid:
2881         if (lock->lk_is_new) {
2882                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2883         /*
2884         * An error encountered after instantiation of the new
2885         * stateid has forced us to destroy it.
2886         */
2887                 if (!seqid_mutating_err(status))
2888                         open_sop->so_seqid--;
2889
2890                 release_state_owner(lock_stp, LOCK_STATE);
2891         }
2892 out:
2893         if (lock->lk_stateowner)
2894                 nfs4_get_stateowner(lock->lk_stateowner);
2895         nfs4_unlock_state();
2896         return status;
2897 }
2898
2899 /*
2900  * LOCKT operation
2901  */
2902 int
2903 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2904 {
2905         struct inode *inode;
2906         struct file file;
2907         struct file_lock file_lock;
2908         struct file_lock *conflicting_lock;
2909         int status;
2910
2911         if (nfs4_in_grace())
2912                 return nfserr_grace;
2913
2914         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2915                  return nfserr_inval;
2916
2917         lockt->lt_stateowner = NULL;
2918         nfs4_lock_state();
2919
2920         status = nfserr_stale_clientid;
2921         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2922                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2923                 goto out;
2924         }
2925
2926         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2927                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2928                 if (status == nfserr_symlink)
2929                         status = nfserr_inval;
2930                 goto out;
2931         }
2932
2933         inode = current_fh->fh_dentry->d_inode;
2934         locks_init_lock(&file_lock);
2935         switch (lockt->lt_type) {
2936                 case NFS4_READ_LT:
2937                 case NFS4_READW_LT:
2938                         file_lock.fl_type = F_RDLCK;
2939                 break;
2940                 case NFS4_WRITE_LT:
2941                 case NFS4_WRITEW_LT:
2942                         file_lock.fl_type = F_WRLCK;
2943                 break;
2944                 default:
2945                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2946                         status = nfserr_inval;
2947                 goto out;
2948         }
2949
2950         lockt->lt_stateowner = find_lockstateowner_str(inode,
2951                         &lockt->lt_clientid, &lockt->lt_owner);
2952         if (lockt->lt_stateowner)
2953                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2954         file_lock.fl_pid = current->tgid;
2955         file_lock.fl_flags = FL_POSIX;
2956
2957         file_lock.fl_start = lockt->lt_offset;
2958         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2959                 file_lock.fl_end = ~(u64)0;
2960         else
2961                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2962
2963         nfs4_transform_lock_offset(&file_lock);
2964
2965         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2966          * since LOCKT doesn't require an OPEN, and therefore a struct
2967          * file may not exist, pass posix_test_lock a struct file with
2968          * only the dentry:inode set.
2969          */
2970         memset(&file, 0, sizeof (struct file));
2971         file.f_dentry = current_fh->fh_dentry;
2972
2973         status = nfs_ok;
2974         conflicting_lock = posix_test_lock(&file, &file_lock);
2975         if (conflicting_lock) {
2976                 status = nfserr_denied;
2977                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2978         }
2979 out:
2980         nfs4_unlock_state();
2981         return status;
2982 }
2983
2984 int
2985 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2986 {
2987         struct nfs4_stateid *stp;
2988         struct file *filp = NULL;
2989         struct file_lock file_lock;
2990         int status;
2991
2992         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2993                 (long long) locku->lu_offset,
2994                 (long long) locku->lu_length);
2995
2996         if (check_lock_length(locku->lu_offset, locku->lu_length))
2997                  return nfserr_inval;
2998
2999         nfs4_lock_state();
3000
3001         if ((status = nfs4_preprocess_seqid_op(current_fh,
3002                                         locku->lu_seqid,
3003                                         &locku->lu_stateid,
3004                                         CHECK_FH | LOCK_STATE,
3005                                         &locku->lu_stateowner, &stp, NULL)))
3006                 goto out;
3007
3008         filp = stp->st_vfs_file;
3009         BUG_ON(!filp);
3010         locks_init_lock(&file_lock);
3011         file_lock.fl_type = F_UNLCK;
3012         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3013         file_lock.fl_pid = current->tgid;
3014         file_lock.fl_file = filp;
3015         file_lock.fl_flags = FL_POSIX;
3016         file_lock.fl_start = locku->lu_offset;
3017
3018         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
3019                 file_lock.fl_end = ~(u64)0;
3020         else
3021                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
3022         nfs4_transform_lock_offset(&file_lock);
3023
3024         /*
3025         *  Try to unlock the file in the VFS.
3026         */
3027         status = posix_lock_file(filp, &file_lock);
3028         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3029                 file_lock.fl_ops->fl_release_private(&file_lock);
3030         if (status) {
3031                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3032                 goto out_nfserr;
3033         }
3034         /*
3035         * OK, unlock succeeded; the only thing left to do is update the stateid.
3036         */
3037         update_stateid(&stp->st_stateid);
3038         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3039
3040 out:
3041         if (locku->lu_stateowner)
3042                 nfs4_get_stateowner(locku->lu_stateowner);
3043         nfs4_unlock_state();
3044         return status;
3045
3046 out_nfserr:
3047         status = nfserrno(status);
3048         goto out;
3049 }
3050
3051 /*
3052  * returns
3053  *      1: locks held by lockowner
3054  *      0: no locks held by lockowner
3055  */
3056 static int
3057 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3058 {
3059         struct file_lock **flpp;
3060         struct inode *inode = filp->f_dentry->d_inode;
3061         int status = 0;
3062
3063         lock_kernel();
3064         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3065                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3066                         status = 1;
3067                         goto out;
3068         }
3069 out:
3070         unlock_kernel();
3071         return status;
3072 }
3073
3074 int
3075 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3076 {
3077         clientid_t *clid = &rlockowner->rl_clientid;
3078         struct nfs4_stateowner *local = NULL;
3079         struct xdr_netobj *owner = &rlockowner->rl_owner;
3080         int status;
3081
3082         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3083                 clid->cl_boot, clid->cl_id);
3084
3085         /* XXX check for lease expiration */
3086
3087         status = nfserr_stale_clientid;
3088         if (STALE_CLIENTID(clid)) {
3089                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3090                 return status;
3091         }
3092
3093         nfs4_lock_state();
3094
3095         status = nfs_ok;
3096         local = find_lockstateowner(owner, clid);
3097         if (local) {
3098                 struct nfs4_stateid *stp;
3099
3100                 /* check for any locks held by any stateid
3101                  * associated with the (lock) stateowner */
3102                 status = nfserr_locks_held;
3103                 list_for_each_entry(stp, &local->so_perfilestate,
3104                                 st_perfilestate) {
3105                         if (check_for_locks(stp->st_vfs_file, local))
3106                                 goto out;
3107                 }
3108                 /* no locks held by (lock) stateowner */
3109                 status = nfs_ok;
3110                 release_stateowner(local);
3111         }
3112 out:
3113         nfs4_unlock_state();
3114         return status;
3115 }
3116
3117 static inline struct nfs4_client_reclaim *
3118 alloc_reclaim(void)
3119 {
3120         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3121 }
3122
3123 /*
3124  * failure => all reset bets are off, nfserr_no_grace...
3125  */
3126 static int
3127 nfs4_client_to_reclaim(char *name)
3128 {
3129         unsigned int strhashval;
3130         struct nfs4_client_reclaim *crp = NULL;
3131
3132         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3133         crp = alloc_reclaim();
3134         if (!crp)
3135                 return 0;
3136         strhashval = clientstr_hashval(name);
3137         INIT_LIST_HEAD(&crp->cr_strhash);
3138         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3139         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3140         reclaim_str_hashtbl_size++;
3141         return 1;
3142 }
3143
3144 static void
3145 nfs4_release_reclaim(void)
3146 {
3147         struct nfs4_client_reclaim *crp = NULL;
3148         int i;
3149
3150         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3151                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3152                         crp = list_entry(reclaim_str_hashtbl[i].next,
3153                                         struct nfs4_client_reclaim, cr_strhash);
3154                         list_del(&crp->cr_strhash);
3155                         kfree(crp);
3156                         reclaim_str_hashtbl_size--;
3157                 }
3158         }
3159         BUG_ON(reclaim_str_hashtbl_size);
3160 }
3161
3162 /*
3163  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3164 static struct nfs4_client_reclaim *
3165 nfs4_find_reclaim_client(clientid_t *clid)
3166 {
3167         unsigned int strhashval;
3168         struct nfs4_client *clp;
3169         struct nfs4_client_reclaim *crp = NULL;
3170
3171
3172         /* find clientid in conf_id_hashtbl */
3173         clp = find_confirmed_client(clid);
3174         if (clp == NULL)
3175                 return NULL;
3176
3177         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3178                             clp->cl_name.len, clp->cl_name.data,
3179                             clp->cl_recdir);
3180
3181         /* find clp->cl_name in reclaim_str_hashtbl */
3182         strhashval = clientstr_hashval(clp->cl_recdir);
3183         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3184                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3185                         return crp;
3186                 }
3187         }
3188         return NULL;
3189 }
3190
3191 /*
3192 * Called from OPEN. Look for clientid in reclaim list.
3193 */
3194 int
3195 nfs4_check_open_reclaim(clientid_t *clid)
3196 {
3197         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3198 }
3199
3200 /* initialization to perform at module load time: */
3201
3202 void
3203 nfs4_state_init(void)
3204 {
3205         int i;
3206
3207         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3208                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3209                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3210                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3211                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3212         }
3213         for (i = 0; i < FILE_HASH_SIZE; i++) {
3214                 INIT_LIST_HEAD(&file_hashtbl[i]);
3215         }
3216         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3217                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3218                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3219         }
3220         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3221                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3222                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3223         }
3224         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3225                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3226                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3227         }
3228         memset(&onestateid, ~0, sizeof(stateid_t));
3229         INIT_LIST_HEAD(&close_lru);
3230         INIT_LIST_HEAD(&client_lru);
3231         INIT_LIST_HEAD(&del_recall_lru);
3232         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3233                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3234         reclaim_str_hashtbl_size = 0;
3235 }
3236
3237 /* initialization to perform when the nfsd service is started: */
3238
3239 static void
3240 __nfs4_state_start(void)
3241 {
3242         time_t grace_time;
3243
3244         boot_time = get_seconds();
3245         grace_time = max(user_lease_time, lease_time);
3246         lease_time = user_lease_time;
3247         in_grace = 1;
3248         printk("NFSD: starting %ld-second grace period\n", grace_time);
3249         laundry_wq = create_singlethread_workqueue("nfsd4");
3250         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3251 }
3252
3253 int
3254 nfs4_state_start(void)
3255 {
3256         int status;
3257
3258         if (nfs4_init)
3259                 return 0;
3260         status = nfsd4_init_slabs();
3261         if (status)
3262                 return status;
3263         __nfs4_state_start();
3264         nfs4_init = 1;
3265         return 0;
3266 }
3267
3268 int
3269 nfs4_in_grace(void)
3270 {
3271         return in_grace;
3272 }
3273
3274 time_t
3275 nfs4_lease_time(void)
3276 {
3277         return lease_time;
3278 }
3279
3280 static void
3281 __nfs4_state_shutdown(void)
3282 {
3283         int i;
3284         struct nfs4_client *clp = NULL;
3285         struct nfs4_delegation *dp = NULL;
3286         struct nfs4_stateowner *sop = NULL;
3287         struct list_head *pos, *next, reaplist;
3288
3289         list_for_each_safe(pos, next, &close_lru) {
3290                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3291                 list_del(&sop->so_close_lru);
3292                 nfs4_put_stateowner(sop);
3293         }
3294
3295         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3296                 while (!list_empty(&conf_id_hashtbl[i])) {
3297                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3298                         expire_client(clp);
3299                 }
3300                 while (!list_empty(&unconf_str_hashtbl[i])) {
3301                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3302                         expire_client(clp);
3303                 }
3304         }
3305         INIT_LIST_HEAD(&reaplist);
3306         spin_lock(&recall_lock);
3307         list_for_each_safe(pos, next, &del_recall_lru) {
3308                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3309                 list_move(&dp->dl_recall_lru, &reaplist);
3310         }
3311         spin_unlock(&recall_lock);
3312         list_for_each_safe(pos, next, &reaplist) {
3313                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3314                 list_del_init(&dp->dl_recall_lru);
3315                 unhash_delegation(dp);
3316         }
3317
3318         cancel_delayed_work(&laundromat_work);
3319         flush_workqueue(laundry_wq);
3320         destroy_workqueue(laundry_wq);
3321         nfs4_init = 0;
3322 }
3323
3324 void
3325 nfs4_state_shutdown(void)
3326 {
3327         nfs4_lock_state();
3328         nfs4_release_reclaim();
3329         __nfs4_state_shutdown();
3330         nfsd4_free_slabs();
3331         nfs4_unlock_state();
3332 }
3333
3334 /*
3335  * Called when leasetime is changed.
3336  *
3337  * The only way the protocol gives us to handle on-the-fly lease changes is to
3338  * simulate a reboot.  Instead of doing that, we just wait till the next time
3339  * we start to register any changes in lease time.  If the administrator
3340  * really wants to change the lease time *now*, they can go ahead and bring
3341  * nfsd down and then back up again after changing the lease time.
3342  */
3343 void
3344 nfs4_reset_lease(time_t leasetime)
3345 {
3346         lock_kernel();
3347         user_lease_time = leasetime;
3348         unlock_kernel();
3349 }