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         }
 895         /* CASE 2:
 896          * conf record that matches input clientid.
 897          * if unconf record that matches input clientid, then unconf->cl_name
 898          * or unconf->cl_verifier don't match the conf record.
 899          */
 900         else if ((conf && !unconf) ||
 901             ((conf && unconf) &&
 902              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 903               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 904                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 905                         status = nfserr_clid_inuse;
 906                 } else {
 907                         clp = conf;
 908                         status = nfs_ok;
 909                 }
 910         }
 911         /* CASE 3:
 912          * conf record not found.
 913          * unconf record found.
 914          * unconf->cl_confirm matches input confirm
 915          */
 916         else if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
 917                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 918                         status = nfserr_clid_inuse;
 919                 } else {
 920                         unsigned int hash =
 921                                 clientstr_hashval(unconf->cl_recdir);
 922                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 923                                                                         hash);
 924                         if (conf) {
 925                                 expire_client(conf);
 926                         }
 927                         clp = unconf;
 928                         move_to_confirmed(unconf);
 929                         status = nfs_ok;
 930                 }
 931         }
 932         /* CASE 4:
 933          * conf record not found, or if conf, then conf->cl_confirm does not
 934          * match input confirm.
 935          * unconf record not found, or if unconf, then unconf->cl_confirm
 936          * does not match input confirm.
 937          */
 938         else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
 939             (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
 940                 status = nfserr_stale_clientid;
 941         }
 942         else {
 943                 /* check that we have hit one of the cases...*/
 944                 status = nfserr_clid_inuse;
 945         }
 946 out:
 947         if (!status)
 948                 nfsd4_probe_callback(clp);
 949         nfs4_unlock_state();
 950         return status;
 951 }
 952
 953 /*
 954  * Open owner state (share locks)
 955  */
 956
 957 /* hash tables for nfs4_stateowner */
 958 #define OWNER_HASH_BITS              8
 959 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 960 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 961
 962 #define ownerid_hashval(id) \
 963         ((id) & OWNER_HASH_MASK)
 964 #define ownerstr_hashval(clientid, ownername) \
 965         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 966
 967 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 968 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 969
 970 /* hash table for nfs4_file */
 971 #define FILE_HASH_BITS                   8
 972 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 973 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 974 /* hash table for (open)nfs4_stateid */
 975 #define STATEID_HASH_BITS              10
 976 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 977 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 978
 979 #define file_hashval(x) \
 980         hash_ptr(x, FILE_HASH_BITS)
 981 #define stateid_hashval(owner_id, file_id)  \
 982         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 983
 984 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 985 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 986
 987 /* OPEN Share state helper functions */
 988 static inline struct nfs4_file *
 989 alloc_init_file(struct inode *ino)
 990 {
 991         struct nfs4_file *fp;
 992         unsigned int hashval = file_hashval(ino);
 993
 994         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 995         if (fp) {
 996                 kref_init(&fp->fi_ref);
 997                 INIT_LIST_HEAD(&fp->fi_hash);
 998                 INIT_LIST_HEAD(&fp->fi_stateids);
 999                 INIT_LIST_HEAD(&fp->fi_delegations);
1000                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1001                 fp->fi_inode = igrab(ino);
1002                 fp->fi_id = current_fileid++;
1003                 return fp;
1004         }
1005         return NULL;
1006 }
1007
1008 static void
1009 nfsd4_free_slab(kmem_cache_t **slab)
1010 {
1011         int status;
1012
1013         if (*slab == NULL)
1014                 return;
1015         status = kmem_cache_destroy(*slab);
1016         *slab = NULL;
1017         WARN_ON(status);
1018 }
1019
1020 static void
1021 nfsd4_free_slabs(void)
1022 {
1023         nfsd4_free_slab(&stateowner_slab);
1024         nfsd4_free_slab(&file_slab);
1025         nfsd4_free_slab(&stateid_slab);
1026         nfsd4_free_slab(&deleg_slab);
1027 }
1028
1029 static int
1030 nfsd4_init_slabs(void)
1031 {
1032         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1033                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1034         if (stateowner_slab == NULL)
1035                 goto out_nomem;
1036         file_slab = kmem_cache_create("nfsd4_files",
1037                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1038         if (file_slab == NULL)
1039                 goto out_nomem;
1040         stateid_slab = kmem_cache_create("nfsd4_stateids",
1041                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1042         if (stateid_slab == NULL)
1043                 goto out_nomem;
1044         deleg_slab = kmem_cache_create("nfsd4_delegations",
1045                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1046         if (deleg_slab == NULL)
1047                 goto out_nomem;
1048         return 0;
1049 out_nomem:
1050         nfsd4_free_slabs();
1051         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1052         return -ENOMEM;
1053 }
1054
1055 void
1056 nfs4_free_stateowner(struct kref *kref)
1057 {
1058         struct nfs4_stateowner *sop =
1059                 container_of(kref, struct nfs4_stateowner, so_ref);
1060         kfree(sop->so_owner.data);
1061         kmem_cache_free(stateowner_slab, sop);
1062 }
1063
1064 static inline struct nfs4_stateowner *
1065 alloc_stateowner(struct xdr_netobj *owner)
1066 {
1067         struct nfs4_stateowner *sop;
1068
1069         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1070                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1071                         memcpy(sop->so_owner.data, owner->data, owner->len);
1072                         sop->so_owner.len = owner->len;
1073                         kref_init(&sop->so_ref);
1074                         return sop;
1075                 }
1076                 kmem_cache_free(stateowner_slab, sop);
1077         }
1078         return NULL;
1079 }
1080
1081 static struct nfs4_stateowner *
1082 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1083         struct nfs4_stateowner *sop;
1084         struct nfs4_replay *rp;
1085         unsigned int idhashval;
1086
1087         if (!(sop = alloc_stateowner(&open->op_owner)))
1088                 return NULL;
1089         idhashval = ownerid_hashval(current_ownerid);
1090         INIT_LIST_HEAD(&sop->so_idhash);
1091         INIT_LIST_HEAD(&sop->so_strhash);
1092         INIT_LIST_HEAD(&sop->so_perclient);
1093         INIT_LIST_HEAD(&sop->so_perfilestate);
1094         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
1095         INIT_LIST_HEAD(&sop->so_close_lru);
1096         sop->so_time = 0;
1097         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1098         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1099         list_add(&sop->so_perclient, &clp->cl_perclient);
1100         sop->so_is_open_owner = 1;
1101         sop->so_id = current_ownerid++;
1102         sop->so_client = clp;
1103         sop->so_seqid = open->op_seqid;
1104         sop->so_confirmed = 0;
1105         rp = &sop->so_replay;
1106         rp->rp_status = NFSERR_SERVERFAULT;
1107         rp->rp_buflen = 0;
1108         rp->rp_buf = rp->rp_ibuf;
1109         return sop;
1110 }
1111
1112 static void
1113 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1114 {
1115         struct nfs4_stateowner *lock_sop;
1116
1117         while (!list_empty(&open_stp->st_perlockowner)) {
1118                 lock_sop = list_entry(open_stp->st_perlockowner.next,
1119                                 struct nfs4_stateowner, so_perlockowner);
1120                 /* list_del(&open_stp->st_perlockowner);  */
1121                 BUG_ON(lock_sop->so_is_open_owner);
1122                 release_stateowner(lock_sop);
1123         }
1124 }
1125
1126 static void
1127 unhash_stateowner(struct nfs4_stateowner *sop)
1128 {
1129         struct nfs4_stateid *stp;
1130
1131         list_del(&sop->so_idhash);
1132         list_del(&sop->so_strhash);
1133         if (sop->so_is_open_owner)
1134                 list_del(&sop->so_perclient);
1135         list_del(&sop->so_perlockowner);
1136         while (!list_empty(&sop->so_perfilestate)) {
1137                 stp = list_entry(sop->so_perfilestate.next,
1138                         struct nfs4_stateid, st_perfilestate);
1139                 if (sop->so_is_open_owner)
1140                         release_stateid(stp, OPEN_STATE);
1141                 else
1142                         release_stateid(stp, LOCK_STATE);
1143         }
1144 }
1145
1146 static void
1147 release_stateowner(struct nfs4_stateowner *sop)
1148 {
1149         unhash_stateowner(sop);
1150         list_del(&sop->so_close_lru);
1151         nfs4_put_stateowner(sop);
1152 }
1153
1154 static inline void
1155 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1156         struct nfs4_stateowner *sop = open->op_stateowner;
1157         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1158
1159         INIT_LIST_HEAD(&stp->st_hash);
1160         INIT_LIST_HEAD(&stp->st_perfilestate);
1161         INIT_LIST_HEAD(&stp->st_perlockowner);
1162         INIT_LIST_HEAD(&stp->st_perfile);
1163         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1164         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1165         list_add(&stp->st_perfile, &fp->fi_stateids);
1166         stp->st_stateowner = sop;
1167         get_nfs4_file(fp);
1168         stp->st_file = fp;
1169         stp->st_stateid.si_boot = boot_time;
1170         stp->st_stateid.si_stateownerid = sop->so_id;
1171         stp->st_stateid.si_fileid = fp->fi_id;
1172         stp->st_stateid.si_generation = 0;
1173         stp->st_access_bmap = 0;
1174         stp->st_deny_bmap = 0;
1175         __set_bit(open->op_share_access, &stp->st_access_bmap);
1176         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1177 }
1178
1179 static void
1180 release_stateid(struct nfs4_stateid *stp, int flags)
1181 {
1182         struct file *filp = stp->st_vfs_file;
1183
1184         list_del(&stp->st_hash);
1185         list_del(&stp->st_perfile);
1186         list_del(&stp->st_perfilestate);
1187         if (flags & OPEN_STATE) {
1188                 release_stateid_lockowners(stp);
1189                 stp->st_vfs_file = NULL;
1190                 nfsd_close(filp);
1191         } else if (flags & LOCK_STATE)
1192                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1193         put_nfs4_file(stp->st_file);
1194         kmem_cache_free(stateid_slab, stp);
1195         stp = NULL;
1196 }
1197
1198 static void
1199 move_to_close_lru(struct nfs4_stateowner *sop)
1200 {
1201         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1202
1203         unhash_stateowner(sop);
1204         list_add_tail(&sop->so_close_lru, &close_lru);
1205         sop->so_time = get_seconds();
1206 }
1207
1208 static void
1209 release_state_owner(struct nfs4_stateid *stp, int flag)
1210 {
1211         struct nfs4_stateowner *sop = stp->st_stateowner;
1212
1213         dprintk("NFSD: release_state_owner\n");
1214         release_stateid(stp, flag);
1215
1216         /* place unused nfs4_stateowners on so_close_lru list to be
1217          * released by the laundromat service after the lease period
1218          * to enable us to handle CLOSE replay
1219          */
1220         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1221                 move_to_close_lru(sop);
1222 }
1223
1224 static int
1225 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1226         return ((sop->so_owner.len == owner->len) &&
1227          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1228           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1229 }
1230
1231 static struct nfs4_stateowner *
1232 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1233 {
1234         struct nfs4_stateowner *so = NULL;
1235
1236         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1237                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1238                         return so;
1239         }
1240         return NULL;
1241 }
1242
1243 /* search file_hashtbl[] for file */
1244 static struct nfs4_file *
1245 find_file(struct inode *ino)
1246 {
1247         unsigned int hashval = file_hashval(ino);
1248         struct nfs4_file *fp;
1249
1250         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1251                 if (fp->fi_inode == ino) {
1252                         get_nfs4_file(fp);
1253                         return fp;
1254                 }
1255         }
1256         return NULL;
1257 }
1258
1259 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1260 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1261
1262 static void
1263 set_access(unsigned int *access, unsigned long bmap) {
1264         int i;
1265
1266         *access = 0;
1267         for (i = 1; i < 4; i++) {
1268                 if (test_bit(i, &bmap))
1269                         *access |= i;
1270         }
1271 }
1272
1273 static void
1274 set_deny(unsigned int *deny, unsigned long bmap) {
1275         int i;
1276
1277         *deny = 0;
1278         for (i = 0; i < 4; i++) {
1279                 if (test_bit(i, &bmap))
1280                         *deny |= i ;
1281         }
1282 }
1283
1284 static int
1285 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1286         unsigned int access, deny;
1287
1288         set_access(&access, stp->st_access_bmap);
1289         set_deny(&deny, stp->st_deny_bmap);
1290         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1291                 return 0;
1292         return 1;
1293 }
1294
1295 /*
1296  * Called to check deny when READ with all zero stateid or
1297  * WRITE with all zero or all one stateid
1298  */
1299 static int
1300 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1301 {
1302         struct inode *ino = current_fh->fh_dentry->d_inode;
1303         struct nfs4_file *fp;
1304         struct nfs4_stateid *stp;
1305         int ret;
1306
1307         dprintk("NFSD: nfs4_share_conflict\n");
1308
1309         fp = find_file(ino);
1310         if (!fp)
1311                 return nfs_ok;
1312         ret = nfserr_share_denied;
1313         /* Search for conflicting share reservations */
1314         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1315                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1316                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1317                         goto out;
1318         }
1319         ret = nfs_ok;
1320 out:
1321         put_nfs4_file(fp);
1322         return ret;
1323 }
1324
1325 static inline void
1326 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1327 {
1328         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1329                 put_write_access(filp->f_dentry->d_inode);
1330                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1331         }
1332 }
1333
1334 /*
1335  * Recall a delegation
1336  */
1337 static int
1338 do_recall(void *__dp)
1339 {
1340         struct nfs4_delegation *dp = __dp;
1341
1342         daemonize("nfsv4-recall");
1343
1344         nfsd4_cb_recall(dp);
1345         return 0;
1346 }
1347
1348 /*
1349  * Spawn a thread to perform a recall on the delegation represented
1350  * by the lease (file_lock)
1351  *
1352  * Called from break_lease() with lock_kernel() held.
1353  * Note: we assume break_lease will only call this *once* for any given
1354  * lease.
1355  */
1356 static
1357 void nfsd_break_deleg_cb(struct file_lock *fl)
1358 {
1359         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1360         struct task_struct *t;
1361
1362         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1363         if (!dp)
1364                 return;
1365
1366         /* We're assuming the state code never drops its reference
1367          * without first removing the lease.  Since we're in this lease
1368          * callback (and since the lease code is serialized by the kernel
1369          * lock) we know the server hasn't removed the lease yet, we know
1370          * it's safe to take a reference: */
1371         atomic_inc(&dp->dl_count);
1372
1373         spin_lock(&recall_lock);
1374         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1375         spin_unlock(&recall_lock);
1376
1377         /* only place dl_time is set. protected by lock_kernel*/
1378         dp->dl_time = get_seconds();
1379
1380         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1381         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1382
1383         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1384         if (IS_ERR(t)) {
1385                 struct nfs4_client *clp = dp->dl_client;
1386
1387                 printk(KERN_INFO "NFSD: Callback thread failed for "
1388                         "for client (clientid %08x/%08x)\n",
1389                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1390                 nfs4_put_delegation(dp);
1391         }
1392 }
1393
1394 /*
1395  * The file_lock is being reapd.
1396  *
1397  * Called by locks_free_lock() with lock_kernel() held.
1398  */
1399 static
1400 void nfsd_release_deleg_cb(struct file_lock *fl)
1401 {
1402         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1403
1404         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1405
1406         if (!(fl->fl_flags & FL_LEASE) || !dp)
1407                 return;
1408         dp->dl_flock = NULL;
1409 }
1410
1411 /*
1412  * Set the delegation file_lock back pointer.
1413  *
1414  * Called from __setlease() with lock_kernel() held.
1415  */
1416 static
1417 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1418 {
1419         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1420
1421         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1422         if (!dp)
1423                 return;
1424         dp->dl_flock = new;
1425 }
1426
1427 /*
1428  * Called from __setlease() with lock_kernel() held
1429  */
1430 static
1431 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1432 {
1433         struct nfs4_delegation *onlistd =
1434                 (struct nfs4_delegation *)onlist->fl_owner;
1435         struct nfs4_delegation *tryd =
1436                 (struct nfs4_delegation *)try->fl_owner;
1437
1438         if (onlist->fl_lmops != try->fl_lmops)
1439                 return 0;
1440
1441         return onlistd->dl_client == tryd->dl_client;
1442 }
1443
1444
1445 static
1446 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1447 {
1448         if (arg & F_UNLCK)
1449                 return lease_modify(onlist, arg);
1450         else
1451                 return -EAGAIN;
1452 }
1453
1454 static struct lock_manager_operations nfsd_lease_mng_ops = {
1455         .fl_break = nfsd_break_deleg_cb,
1456         .fl_release_private = nfsd_release_deleg_cb,
1457         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1458         .fl_mylease = nfsd_same_client_deleg_cb,
1459         .fl_change = nfsd_change_deleg_cb,
1460 };
1461
1462
1463 /*
1464  * nfsd4_process_open1()
1465  *      lookup stateowner.
1466  *              found:
1467  *                      check confirmed
1468  *                              confirmed:
1469  *                                      check seqid
1470  *                              not confirmed:
1471  *                                      delete owner
1472  *                                      create new owner
1473  *              notfound:
1474  *                      verify clientid
1475  *                      create new owner
1476  *
1477  * called with nfs4_lock_state() held.
1478  */
1479 int
1480 nfsd4_process_open1(struct nfsd4_open *open)
1481 {
1482         int status;
1483         clientid_t *clientid = &open->op_clientid;
1484         struct nfs4_client *clp = NULL;
1485         unsigned int strhashval;
1486         struct nfs4_stateowner *sop = NULL;
1487
1488         status = nfserr_inval;
1489         if (!check_name(open->op_owner))
1490                 goto out;
1491
1492         if (STALE_CLIENTID(&open->op_clientid))
1493                 return nfserr_stale_clientid;
1494
1495         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1496         sop = find_openstateowner_str(strhashval, open);
1497         if (sop) {
1498                 open->op_stateowner = sop;
1499                 /* check for replay */
1500                 if (open->op_seqid == sop->so_seqid){
1501                         if (sop->so_replay.rp_buflen)
1502                                 return NFSERR_REPLAY_ME;
1503                         else {
1504                                 /* The original OPEN failed so spectacularly
1505                                  * that we don't even have replay data saved!
1506                                  * Therefore, we have no choice but to continue
1507                                  * processing this OPEN; presumably, we'll
1508                                  * fail again for the same reason.
1509                                  */
1510                                 dprintk("nfsd4_process_open1:"
1511                                         " replay with no replay cache\n");
1512                                 goto renew;
1513                         }
1514                 } else if (sop->so_confirmed) {
1515                         if (open->op_seqid == sop->so_seqid + 1)
1516                                 goto renew;
1517                         status = nfserr_bad_seqid;
1518                         goto out;
1519                 } else {
1520                         /* If we get here, we received an OPEN for an
1521                          * unconfirmed nfs4_stateowner. Since the seqid's are
1522                          * different, purge the existing nfs4_stateowner, and
1523                          * instantiate a new one.
1524                          */
1525                         clp = sop->so_client;
1526                         release_stateowner(sop);
1527                 }
1528         } else {
1529                 /* nfs4_stateowner not found.
1530                  * Verify clientid and instantiate new nfs4_stateowner.
1531                  * If verify fails this is presumably the result of the
1532                  * client's lease expiring.
1533                  */
1534                 status = nfserr_expired;
1535                 clp = find_confirmed_client(clientid);
1536                 if (clp == NULL)
1537                         goto out;
1538         }
1539         status = nfserr_resource;
1540         sop = alloc_init_open_stateowner(strhashval, clp, open);
1541         if (sop == NULL)
1542                 goto out;
1543         open->op_stateowner = sop;
1544 renew:
1545         status = nfs_ok;
1546         renew_client(sop->so_client);
1547 out:
1548         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1549                 status = nfserr_reclaim_bad;
1550         return status;
1551 }
1552
1553 static inline int
1554 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1555 {
1556         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1557                 return nfserr_openmode;
1558         else
1559                 return nfs_ok;
1560 }
1561
1562 static struct nfs4_delegation *
1563 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1564 {
1565         struct nfs4_delegation *dp;
1566
1567         list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
1568                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1569                         return dp;
1570         }
1571         return NULL;
1572 }
1573
1574 static int
1575 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1576                 struct nfs4_delegation **dp)
1577 {
1578         int flags;
1579         int status = nfserr_bad_stateid;
1580
1581         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1582         if (*dp == NULL)
1583                 goto out;
1584         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1585                                                 RD_STATE : WR_STATE;
1586         status = nfs4_check_delegmode(*dp, flags);
1587         if (status)
1588                 *dp = NULL;
1589 out:
1590         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1591                 return nfs_ok;
1592         if (status)
1593                 return status;
1594         open->op_stateowner->so_confirmed = 1;
1595         return nfs_ok;
1596 }
1597
1598 static int
1599 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1600 {
1601         struct nfs4_stateid *local;
1602         int status = nfserr_share_denied;
1603         struct nfs4_stateowner *sop = open->op_stateowner;
1604
1605         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1606                 /* ignore lock owners */
1607                 if (local->st_stateowner->so_is_open_owner == 0)
1608                         continue;
1609                 /* remember if we have seen this open owner */
1610                 if (local->st_stateowner == sop)
1611                         *stpp = local;
1612                 /* check for conflicting share reservations */
1613                 if (!test_share(local, open))
1614                         goto out;
1615         }
1616         status = 0;
1617 out:
1618         return status;
1619 }
1620
1621 static inline struct nfs4_stateid *
1622 nfs4_alloc_stateid(void)
1623 {
1624         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1625 }
1626
1627 static int
1628 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1629                 struct nfs4_delegation *dp,
1630                 struct svc_fh *cur_fh, int flags)
1631 {
1632         struct nfs4_stateid *stp;
1633
1634         stp = nfs4_alloc_stateid();
1635         if (stp == NULL)
1636                 return nfserr_resource;
1637
1638         if (dp) {
1639                 get_file(dp->dl_vfs_file);
1640                 stp->st_vfs_file = dp->dl_vfs_file;
1641         } else {
1642                 int status;
1643                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1644                                 &stp->st_vfs_file);
1645                 if (status) {
1646                         if (status == nfserr_dropit)
1647                                 status = nfserr_jukebox;
1648                         kmem_cache_free(stateid_slab, stp);
1649                         return status;
1650                 }
1651         }
1652         *stpp = stp;
1653         return 0;
1654 }
1655
1656 static inline int
1657 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1658                 struct nfsd4_open *open)
1659 {
1660         struct iattr iattr = {
1661                 .ia_valid = ATTR_SIZE,
1662                 .ia_size = 0,
1663         };
1664         if (!open->op_truncate)
1665                 return 0;
1666         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1667                 return -EINVAL;
1668         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1669 }
1670
1671 static int
1672 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1673 {
1674         struct file *filp = stp->st_vfs_file;
1675         struct inode *inode = filp->f_dentry->d_inode;
1676         unsigned int share_access;
1677         int status;
1678
1679         set_access(&share_access, stp->st_access_bmap);
1680         share_access = ~share_access;
1681         share_access &= open->op_share_access;
1682
1683         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1684                 return nfsd4_truncate(rqstp, cur_fh, open);
1685
1686         status = get_write_access(inode);
1687         if (status)
1688                 return nfserrno(status);
1689         status = nfsd4_truncate(rqstp, cur_fh, open);
1690         if (status) {
1691                 put_write_access(inode);
1692                 return status;
1693         }
1694         /* remember the open */
1695         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1696         set_bit(open->op_share_access, &stp->st_access_bmap);
1697         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1698
1699         return nfs_ok;
1700 }
1701
1702
1703 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1704 static void
1705 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1706 {
1707         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1708                 if (*status)
1709                         *status = nfserr_reclaim_bad;
1710                 else {
1711                         open->op_stateowner->so_confirmed = 1;
1712                         open->op_stateowner->so_seqid--;
1713                 }
1714         }
1715 }
1716
1717 /*
1718  * Attempt to hand out a delegation.
1719  */
1720 static void
1721 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1722 {
1723         struct nfs4_delegation *dp;
1724         struct nfs4_stateowner *sop = stp->st_stateowner;
1725         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1726         struct file_lock fl, *flp = &fl;
1727         int status, flag = 0;
1728
1729         flag = NFS4_OPEN_DELEGATE_NONE;
1730         open->op_recall = 0;
1731         switch (open->op_claim_type) {
1732                 case NFS4_OPEN_CLAIM_PREVIOUS:
1733                         if (!atomic_read(&cb->cb_set))
1734                                 open->op_recall = 1;
1735                         flag = open->op_delegate_type;
1736                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1737                                 goto out;
1738                         break;
1739                 case NFS4_OPEN_CLAIM_NULL:
1740                         /* Let's not give out any delegations till everyone's
1741                          * had the chance to reclaim theirs.... */
1742                         if (nfs4_in_grace())
1743                                 goto out;
1744                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1745                                 goto out;
1746                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1747                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1748                         else
1749                                 flag = NFS4_OPEN_DELEGATE_READ;
1750                         break;
1751                 default:
1752                         goto out;
1753         }
1754
1755         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1756         if (dp == NULL) {
1757                 flag = NFS4_OPEN_DELEGATE_NONE;
1758                 goto out;
1759         }
1760         locks_init_lock(&fl);
1761         fl.fl_lmops = &nfsd_lease_mng_ops;
1762         fl.fl_flags = FL_LEASE;
1763         fl.fl_end = OFFSET_MAX;
1764         fl.fl_owner =  (fl_owner_t)dp;
1765         fl.fl_file = stp->st_vfs_file;
1766         fl.fl_pid = current->tgid;
1767
1768         /* setlease checks to see if delegation should be handed out.
1769          * the lock_manager callbacks fl_mylease and fl_change are used
1770          */
1771         if ((status = setlease(stp->st_vfs_file,
1772                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1773                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1774                 unhash_delegation(dp);
1775                 flag = NFS4_OPEN_DELEGATE_NONE;
1776                 goto out;
1777         }
1778
1779         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1780
1781         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1782                      dp->dl_stateid.si_boot,
1783                      dp->dl_stateid.si_stateownerid,
1784                      dp->dl_stateid.si_fileid,
1785                      dp->dl_stateid.si_generation);
1786 out:
1787         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1788                         && flag == NFS4_OPEN_DELEGATE_NONE
1789                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1790                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1791         open->op_delegate_type = flag;
1792 }
1793
1794 /*
1795  * called with nfs4_lock_state() held.
1796  */
1797 int
1798 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1799 {
1800         struct nfs4_file *fp = NULL;
1801         struct inode *ino = current_fh->fh_dentry->d_inode;
1802         struct nfs4_stateid *stp = NULL;
1803         struct nfs4_delegation *dp = NULL;
1804         int status;
1805
1806         status = nfserr_inval;
1807         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1808                 goto out;
1809         /*
1810          * Lookup file; if found, lookup stateid and check open request,
1811          * and check for delegations in the process of being recalled.
1812          * If not found, create the nfs4_file struct
1813          */
1814         fp = find_file(ino);
1815         if (fp) {
1816                 if ((status = nfs4_check_open(fp, open, &stp)))
1817                         goto out;
1818                 status = nfs4_check_deleg(fp, open, &dp);
1819                 if (status)
1820                         goto out;
1821         } else {
1822                 status = nfserr_bad_stateid;
1823                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1824                         goto out;
1825                 status = nfserr_resource;
1826                 fp = alloc_init_file(ino);
1827                 if (fp == NULL)
1828                         goto out;
1829         }
1830
1831         /*
1832          * OPEN the file, or upgrade an existing OPEN.
1833          * If truncate fails, the OPEN fails.
1834          */
1835         if (stp) {
1836                 /* Stateid was found, this is an OPEN upgrade */
1837                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1838                 if (status)
1839                         goto out;
1840         } else {
1841                 /* Stateid was not found, this is a new OPEN */
1842                 int flags = 0;
1843                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1844                         flags = MAY_WRITE;
1845                 else
1846                         flags = MAY_READ;
1847                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1848                 if (status)
1849                         goto out;
1850                 init_stateid(stp, fp, open);
1851                 status = nfsd4_truncate(rqstp, current_fh, open);
1852                 if (status) {
1853                         release_stateid(stp, OPEN_STATE);
1854                         goto out;
1855                 }
1856         }
1857         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1858
1859         /*
1860         * Attempt to hand out a delegation. No error return, because the
1861         * OPEN succeeds even if we fail.
1862         */
1863         nfs4_open_delegation(current_fh, open, stp);
1864
1865         status = nfs_ok;
1866
1867         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1868                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1869                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1870 out:
1871         if (fp)
1872                 put_nfs4_file(fp);
1873         /* CLAIM_PREVIOUS has different error returns */
1874         nfs4_set_claim_prev(open, &status);
1875         /*
1876         * To finish the open response, we just need to set the rflags.
1877         */
1878         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1879         if (!open->op_stateowner->so_confirmed)
1880                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1881
1882         return status;
1883 }
1884
1885 static struct workqueue_struct *laundry_wq;
1886 static struct work_struct laundromat_work;
1887 static void laundromat_main(void *);
1888 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1889
1890 int
1891 nfsd4_renew(clientid_t *clid)
1892 {
1893         struct nfs4_client *clp;
1894         int status;
1895
1896         nfs4_lock_state();
1897         dprintk("process_renew(%08x/%08x): starting\n",
1898                         clid->cl_boot, clid->cl_id);
1899         status = nfserr_stale_clientid;
1900         if (STALE_CLIENTID(clid))
1901                 goto out;
1902         clp = find_confirmed_client(clid);
1903         status = nfserr_expired;
1904         if (clp == NULL) {
1905                 /* We assume the client took too long to RENEW. */
1906                 dprintk("nfsd4_renew: clientid not found!\n");
1907                 goto out;
1908         }
1909         renew_client(clp);
1910         status = nfserr_cb_path_down;
1911         if (!list_empty(&clp->cl_del_perclnt)
1912                         && !atomic_read(&clp->cl_callback.cb_set))
1913                 goto out;
1914         status = nfs_ok;
1915 out:
1916         nfs4_unlock_state();
1917         return status;
1918 }
1919
1920 static void
1921 end_grace(void)
1922 {
1923         dprintk("NFSD: end of grace period\n");
1924         in_grace = 0;
1925 }
1926
1927 static time_t
1928 nfs4_laundromat(void)
1929 {
1930         struct nfs4_client *clp;
1931         struct nfs4_stateowner *sop;
1932         struct nfs4_delegation *dp;
1933         struct list_head *pos, *next, reaplist;
1934         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1935         time_t t, clientid_val = NFSD_LEASE_TIME;
1936         time_t u, test_val = NFSD_LEASE_TIME;
1937
1938         nfs4_lock_state();
1939
1940         dprintk("NFSD: laundromat service - starting\n");
1941         if (in_grace)
1942                 end_grace();
1943         list_for_each_safe(pos, next, &client_lru) {
1944                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1945                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1946                         t = clp->cl_time - cutoff;
1947                         if (clientid_val > t)
1948                                 clientid_val = t;
1949                         break;
1950                 }
1951                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1952                         clp->cl_clientid.cl_id);
1953                 expire_client(clp);
1954         }
1955         INIT_LIST_HEAD(&reaplist);
1956         spin_lock(&recall_lock);
1957         list_for_each_safe(pos, next, &del_recall_lru) {
1958                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1959                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1960                         u = dp->dl_time - cutoff;
1961                         if (test_val > u)
1962                                 test_val = u;
1963                         break;
1964                 }
1965                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1966                                     dp, dp->dl_flock);
1967                 list_move(&dp->dl_recall_lru, &reaplist);
1968         }
1969         spin_unlock(&recall_lock);
1970         list_for_each_safe(pos, next, &reaplist) {
1971                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1972                 list_del_init(&dp->dl_recall_lru);
1973                 unhash_delegation(dp);
1974         }
1975         test_val = NFSD_LEASE_TIME;
1976         list_for_each_safe(pos, next, &close_lru) {
1977                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1978                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1979                         u = sop->so_time - cutoff;
1980                         if (test_val > u)
1981                                 test_val = u;
1982                         break;
1983                 }
1984                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1985                         sop->so_id);
1986                 list_del(&sop->so_close_lru);
1987                 nfs4_put_stateowner(sop);
1988         }
1989         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1990                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1991         nfs4_unlock_state();
1992         return clientid_val;
1993 }
1994
1995 void
1996 laundromat_main(void *not_used)
1997 {
1998         time_t t;
1999
2000         t = nfs4_laundromat();
2001         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
2002         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
2003 }
2004
2005 /* search ownerid_hashtbl[] and close_lru for stateid owner
2006  * (stateid->si_stateownerid)
2007  */
2008 static struct nfs4_stateowner *
2009 find_openstateowner_id(u32 st_id, int flags) {
2010         struct nfs4_stateowner *local = NULL;
2011
2012         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2013         if (flags & CLOSE_STATE) {
2014                 list_for_each_entry(local, &close_lru, so_close_lru) {
2015                         if (local->so_id == st_id)
2016                                 return local;
2017                 }
2018         }
2019         return NULL;
2020 }
2021
2022 static inline int
2023 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2024 {
2025         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2026 }
2027
2028 static int
2029 STALE_STATEID(stateid_t *stateid)
2030 {
2031         if (stateid->si_boot == boot_time)
2032                 return 0;
2033         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2034                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2035                 stateid->si_generation);
2036         return 1;
2037 }
2038
2039 static inline int
2040 access_permit_read(unsigned long access_bmap)
2041 {
2042         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2043                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2044                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2045 }
2046
2047 static inline int
2048 access_permit_write(unsigned long access_bmap)
2049 {
2050         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2051                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2052 }
2053
2054 static
2055 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2056 {
2057         int status = nfserr_openmode;
2058
2059         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2060                 goto out;
2061         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2062                 goto out;
2063         status = nfs_ok;
2064 out:
2065         return status;
2066 }
2067
2068 static inline int
2069 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2070 {
2071         /* Trying to call delegreturn with a special stateid? Yuch: */
2072         if (!(flags & (RD_STATE | WR_STATE)))
2073                 return nfserr_bad_stateid;
2074         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2075                 return nfs_ok;
2076         else if (nfs4_in_grace()) {
2077                 /* Answer in remaining cases depends on existance of
2078                  * conflicting state; so we must wait out the grace period. */
2079                 return nfserr_grace;
2080         } else if (flags & WR_STATE)
2081                 return nfs4_share_conflict(current_fh,
2082                                 NFS4_SHARE_DENY_WRITE);
2083         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2084                 return nfs4_share_conflict(current_fh,
2085                                 NFS4_SHARE_DENY_READ);
2086 }
2087
2088 /*
2089  * Allow READ/WRITE during grace period on recovered state only for files
2090  * that are not able to provide mandatory locking.
2091  */
2092 static inline int
2093 io_during_grace_disallowed(struct inode *inode, int flags)
2094 {
2095         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2096                 && MANDATORY_LOCK(inode);
2097 }
2098
2099 /*
2100 * Checks for stateid operations
2101 */
2102 int
2103 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2104 {
2105         struct nfs4_stateid *stp = NULL;
2106         struct nfs4_delegation *dp = NULL;
2107         stateid_t *stidp;
2108         struct inode *ino = current_fh->fh_dentry->d_inode;
2109         int status;
2110
2111         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2112                 stateid->si_boot, stateid->si_stateownerid,
2113                 stateid->si_fileid, stateid->si_generation);
2114         if (filpp)
2115                 *filpp = NULL;
2116
2117         if (io_during_grace_disallowed(ino, flags))
2118                 return nfserr_grace;
2119
2120         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2121                 return check_special_stateids(current_fh, stateid, flags);
2122
2123         /* STALE STATEID */
2124         status = nfserr_stale_stateid;
2125         if (STALE_STATEID(stateid))
2126                 goto out;
2127
2128         /* BAD STATEID */
2129         status = nfserr_bad_stateid;
2130         if (!stateid->si_fileid) { /* delegation stateid */
2131                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2132                         dprintk("NFSD: delegation stateid not found\n");
2133                         if (nfs4_in_grace())
2134                                 status = nfserr_grace;
2135                         goto out;
2136                 }
2137                 stidp = &dp->dl_stateid;
2138         } else { /* open or lock stateid */
2139                 if (!(stp = find_stateid(stateid, flags))) {
2140                         dprintk("NFSD: open or lock stateid not found\n");
2141                         if (nfs4_in_grace())
2142                                 status = nfserr_grace;
2143                         goto out;
2144                 }
2145                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2146                         goto out;
2147                 if (!stp->st_stateowner->so_confirmed)
2148                         goto out;
2149                 stidp = &stp->st_stateid;
2150         }
2151         if (stateid->si_generation > stidp->si_generation)
2152                 goto out;
2153
2154         /* OLD STATEID */
2155         status = nfserr_old_stateid;
2156         if (stateid->si_generation < stidp->si_generation)
2157                 goto out;
2158         if (stp) {
2159                 if ((status = nfs4_check_openmode(stp,flags)))
2160                         goto out;
2161                 renew_client(stp->st_stateowner->so_client);
2162                 if (filpp)
2163                         *filpp = stp->st_vfs_file;
2164         } else if (dp) {
2165                 if ((status = nfs4_check_delegmode(dp, flags)))
2166                         goto out;
2167                 renew_client(dp->dl_client);
2168                 if (flags & DELEG_RET)
2169                         unhash_delegation(dp);
2170                 if (filpp)
2171                         *filpp = dp->dl_vfs_file;
2172         }
2173         status = nfs_ok;
2174 out:
2175         return status;
2176 }
2177
2178
2179 /*
2180  * Checks for sequence id mutating operations.
2181  */
2182 static int
2183 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)
2184 {
2185         int status;
2186         struct nfs4_stateid *stp;
2187         struct nfs4_stateowner *sop;
2188
2189         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2190                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2191                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2192                 stateid->si_generation);
2193
2194         *stpp = NULL;
2195         *sopp = NULL;
2196
2197         status = nfserr_bad_stateid;
2198         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2199                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2200                 goto out;
2201         }
2202
2203         status = nfserr_stale_stateid;
2204         if (STALE_STATEID(stateid))
2205                 goto out;
2206         /*
2207         * We return BAD_STATEID if filehandle doesn't match stateid,
2208         * the confirmed flag is incorrecly set, or the generation
2209         * number is incorrect.
2210         * If there is no entry in the openfile table for this id,
2211         * we can't always return BAD_STATEID;
2212         * this might be a retransmitted CLOSE which has arrived after
2213         * the openfile has been released.
2214         */
2215         if (!(stp = find_stateid(stateid, flags)))
2216                 goto no_nfs4_stateid;
2217
2218         status = nfserr_bad_stateid;
2219
2220         /* for new lock stateowners:
2221          * check that the lock->v.new.open_stateid
2222          * refers to an open stateowner
2223          *
2224          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2225          * as the open_stateid->st_stateowner->so_client->clientid
2226          */
2227         if (lockclid) {
2228                 struct nfs4_stateowner *sop = stp->st_stateowner;
2229                 struct nfs4_client *clp = sop->so_client;
2230
2231                 if (!sop->so_is_open_owner)
2232                         goto out;
2233                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2234                         goto out;
2235         }
2236
2237         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2238                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2239                 goto out;
2240         }
2241
2242         *stpp = stp;
2243         *sopp = sop = stp->st_stateowner;
2244
2245         /*
2246         *  We now validate the seqid and stateid generation numbers.
2247         *  For the moment, we ignore the possibility of
2248         *  generation number wraparound.
2249         */
2250         if (seqid != sop->so_seqid + 1)
2251                 goto check_replay;
2252
2253         if (sop->so_confirmed) {
2254                 if (flags & CONFIRM) {
2255                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2256                         goto out;
2257                 }
2258         }
2259         else {
2260                 if (!(flags & CONFIRM)) {
2261                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2262                         goto out;
2263                 }
2264         }
2265         if (stateid->si_generation > stp->st_stateid.si_generation) {
2266                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2267                 goto out;
2268         }
2269
2270         status = nfserr_old_stateid;
2271         if (stateid->si_generation < stp->st_stateid.si_generation) {
2272                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2273                 goto out;
2274         }
2275         /* XXX renew the client lease here */
2276         status = nfs_ok;
2277
2278 out:
2279         return status;
2280
2281 no_nfs4_stateid:
2282
2283         /*
2284         * We determine whether this is a bad stateid or a replay,
2285         * starting by trying to look up the stateowner.
2286         * If stateowner is not found - stateid is bad.
2287         */
2288         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2289                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2290                 status = nfserr_bad_stateid;
2291                 goto out;
2292         }
2293         *sopp = sop;
2294
2295 check_replay:
2296         if (seqid == sop->so_seqid) {
2297                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2298                 /* indicate replay to calling function */
2299                 status = NFSERR_REPLAY_ME;
2300         } else  {
2301                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2302
2303                 *sopp = NULL;
2304                 status = nfserr_bad_seqid;
2305         }
2306         goto out;
2307 }
2308
2309 int
2310 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2311 {
2312         int status;
2313         struct nfs4_stateowner *sop;
2314         struct nfs4_stateid *stp;
2315
2316         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2317                         (int)current_fh->fh_dentry->d_name.len,
2318                         current_fh->fh_dentry->d_name.name);
2319
2320         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2321                 goto out;
2322
2323         nfs4_lock_state();
2324
2325         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2326                                         &oc->oc_req_stateid,
2327                                         CHECK_FH | CONFIRM | OPEN_STATE,
2328                                         &oc->oc_stateowner, &stp, NULL)))
2329                 goto out;
2330
2331         sop = oc->oc_stateowner;
2332         sop->so_confirmed = 1;
2333         update_stateid(&stp->st_stateid);
2334         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2335         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2336                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2337                          stp->st_stateid.si_boot,
2338                          stp->st_stateid.si_stateownerid,
2339                          stp->st_stateid.si_fileid,
2340                          stp->st_stateid.si_generation);
2341 out:
2342         if (oc->oc_stateowner)
2343                 nfs4_get_stateowner(oc->oc_stateowner);
2344         nfs4_unlock_state();
2345         return status;
2346 }
2347
2348
2349 /*
2350  * unset all bits in union bitmap (bmap) that
2351  * do not exist in share (from successful OPEN_DOWNGRADE)
2352  */
2353 static void
2354 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2355 {
2356         int i;
2357         for (i = 1; i < 4; i++) {
2358                 if ((i & access) != i)
2359                         __clear_bit(i, bmap);
2360         }
2361 }
2362
2363 static void
2364 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2365 {
2366         int i;
2367         for (i = 0; i < 4; i++) {
2368                 if ((i & deny) != i)
2369                         __clear_bit(i, bmap);
2370         }
2371 }
2372
2373 int
2374 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2375 {
2376         int status;
2377         struct nfs4_stateid *stp;
2378         unsigned int share_access;
2379
2380         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2381                         (int)current_fh->fh_dentry->d_name.len,
2382                         current_fh->fh_dentry->d_name.name);
2383
2384         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2385                 return nfserr_inval;
2386
2387         nfs4_lock_state();
2388         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2389                                         &od->od_stateid,
2390                                         CHECK_FH | OPEN_STATE,
2391                                         &od->od_stateowner, &stp, NULL)))
2392                 goto out;
2393
2394         status = nfserr_inval;
2395         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2396                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2397                         stp->st_access_bmap, od->od_share_access);
2398                 goto out;
2399         }
2400         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2401                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2402                         stp->st_deny_bmap, od->od_share_deny);
2403                 goto out;
2404         }
2405         set_access(&share_access, stp->st_access_bmap);
2406         nfs4_file_downgrade(stp->st_vfs_file,
2407                             share_access & ~od->od_share_access);
2408
2409         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2410         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2411
2412         update_stateid(&stp->st_stateid);
2413         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2414         status = nfs_ok;
2415 out:
2416         if (od->od_stateowner)
2417                 nfs4_get_stateowner(od->od_stateowner);
2418         nfs4_unlock_state();
2419         return status;
2420 }
2421
2422 /*
2423  * nfs4_unlock_state() called after encode
2424  */
2425 int
2426 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2427 {
2428         int status;
2429         struct nfs4_stateid *stp;
2430
2431         dprintk("NFSD: nfsd4_close on file %.*s\n",
2432                         (int)current_fh->fh_dentry->d_name.len,
2433                         current_fh->fh_dentry->d_name.name);
2434
2435         nfs4_lock_state();
2436         /* check close_lru for replay */
2437         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2438                                         &close->cl_stateid,
2439                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2440                                         &close->cl_stateowner, &stp, NULL)))
2441                 goto out;
2442         /*
2443         *  Return success, but first update the stateid.
2444         */
2445         status = nfs_ok;
2446         update_stateid(&stp->st_stateid);
2447         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2448
2449         /* release_state_owner() calls nfsd_close() if needed */
2450         release_state_owner(stp, OPEN_STATE);
2451 out:
2452         if (close->cl_stateowner)
2453                 nfs4_get_stateowner(close->cl_stateowner);
2454         nfs4_unlock_state();
2455         return status;
2456 }
2457
2458 int
2459 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2460 {
2461         int status;
2462
2463         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2464                 goto out;
2465
2466         nfs4_lock_state();
2467         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2468         nfs4_unlock_state();
2469 out:
2470         return status;
2471 }
2472
2473
2474 /*
2475  * Lock owner state (byte-range locks)
2476  */
2477 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2478 #define LOCK_HASH_BITS              8
2479 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2480 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2481
2482 #define lockownerid_hashval(id) \
2483         ((id) & LOCK_HASH_MASK)
2484
2485 static inline unsigned int
2486 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2487                 struct xdr_netobj *ownername)
2488 {
2489         return (file_hashval(inode) + cl_id
2490                         + opaque_hashval(ownername->data, ownername->len))
2491                 & LOCK_HASH_MASK;
2492 }
2493
2494 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2495 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2496 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2497
2498 static struct nfs4_stateid *
2499 find_stateid(stateid_t *stid, int flags)
2500 {
2501         struct nfs4_stateid *local = NULL;
2502         u32 st_id = stid->si_stateownerid;
2503         u32 f_id = stid->si_fileid;
2504         unsigned int hashval;
2505
2506         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2507         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2508                 hashval = stateid_hashval(st_id, f_id);
2509                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2510                         if ((local->st_stateid.si_stateownerid == st_id) &&
2511                             (local->st_stateid.si_fileid == f_id))
2512                                 return local;
2513                 }
2514         }
2515         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2516                 hashval = stateid_hashval(st_id, f_id);
2517                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2518                         if ((local->st_stateid.si_stateownerid == st_id) &&
2519                             (local->st_stateid.si_fileid == f_id))
2520                                 return local;
2521                 }
2522         } else
2523                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2524         return NULL;
2525 }
2526
2527 static struct nfs4_delegation *
2528 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2529 {
2530         struct nfs4_file *fp;
2531         struct nfs4_delegation *dl;
2532
2533         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2534                     stid->si_boot, stid->si_stateownerid,
2535                     stid->si_fileid, stid->si_generation);
2536
2537         fp = find_file(ino);
2538         if (!fp)
2539                 return NULL;
2540         dl = find_delegation_file(fp, stid);
2541         put_nfs4_file(fp);
2542         return dl;
2543 }
2544
2545 /*
2546  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2547  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2548  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2549  * locking, this prevents us from being completely protocol-compliant.  The
2550  * real solution to this problem is to start using unsigned file offsets in
2551  * the VFS, but this is a very deep change!
2552  */
2553 static inline void
2554 nfs4_transform_lock_offset(struct file_lock *lock)
2555 {
2556         if (lock->fl_start < 0)
2557                 lock->fl_start = OFFSET_MAX;
2558         if (lock->fl_end < 0)
2559                 lock->fl_end = OFFSET_MAX;
2560 }
2561
2562 static int
2563 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2564 {
2565         struct nfs4_stateowner *local = NULL;
2566         int status = 0;
2567
2568         if (hashval >= LOCK_HASH_SIZE)
2569                 goto out;
2570         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2571                 if (local == sop) {
2572                         status = 1;
2573                         goto out;
2574                 }
2575         }
2576 out:
2577         return status;
2578 }
2579
2580
2581 static inline void
2582 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2583 {
2584         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2585         unsigned int hval = lockownerid_hashval(sop->so_id);
2586
2587         deny->ld_sop = NULL;
2588         if (nfs4_verify_lock_stateowner(sop, hval)) {
2589                 kref_get(&sop->so_ref);
2590                 deny->ld_sop = sop;
2591                 deny->ld_clientid = sop->so_client->cl_clientid;
2592         }
2593         deny->ld_start = fl->fl_start;
2594         deny->ld_length = ~(u64)0;
2595         if (fl->fl_end != ~(u64)0)
2596                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2597         deny->ld_type = NFS4_READ_LT;
2598         if (fl->fl_type != F_RDLCK)
2599                 deny->ld_type = NFS4_WRITE_LT;
2600 }
2601
2602 static struct nfs4_stateowner *
2603 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2604 {
2605         struct nfs4_stateowner *local = NULL;
2606         int i;
2607
2608         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2609                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2610                         if (!cmp_owner_str(local, owner, clid))
2611                                 continue;
2612                         return local;
2613                 }
2614         }
2615         return NULL;
2616 }
2617
2618 static struct nfs4_stateowner *
2619 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2620                 struct xdr_netobj *owner)
2621 {
2622         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2623         struct nfs4_stateowner *op;
2624
2625         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2626                 if (cmp_owner_str(op, owner, clid))
2627                         return op;
2628         }
2629         return NULL;
2630 }
2631
2632 /*
2633  * Alloc a lock owner structure.
2634  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2635  * occured.
2636  *
2637  * strhashval = lock_ownerstr_hashval
2638  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2639  */
2640
2641 static struct nfs4_stateowner *
2642 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2643         struct nfs4_stateowner *sop;
2644         struct nfs4_replay *rp;
2645         unsigned int idhashval;
2646
2647         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2648                 return NULL;
2649         idhashval = lockownerid_hashval(current_ownerid);
2650         INIT_LIST_HEAD(&sop->so_idhash);
2651         INIT_LIST_HEAD(&sop->so_strhash);
2652         INIT_LIST_HEAD(&sop->so_perclient);
2653         INIT_LIST_HEAD(&sop->so_perfilestate);
2654         INIT_LIST_HEAD(&sop->so_perlockowner);
2655         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2656         sop->so_time = 0;
2657         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2658         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2659         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2660         sop->so_is_open_owner = 0;
2661         sop->so_id = current_ownerid++;
2662         sop->so_client = clp;
2663         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2664         sop->so_confirmed = 1;
2665         rp = &sop->so_replay;
2666         rp->rp_status = NFSERR_SERVERFAULT;
2667         rp->rp_buflen = 0;
2668         rp->rp_buf = rp->rp_ibuf;
2669         return sop;
2670 }
2671
2672 static struct nfs4_stateid *
2673 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2674 {
2675         struct nfs4_stateid *stp;
2676         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2677
2678         stp = nfs4_alloc_stateid();
2679         if (stp == NULL)
2680                 goto out;
2681         INIT_LIST_HEAD(&stp->st_hash);
2682         INIT_LIST_HEAD(&stp->st_perfile);
2683         INIT_LIST_HEAD(&stp->st_perfilestate);
2684         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2685         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2686         list_add(&stp->st_perfile, &fp->fi_stateids);
2687         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2688         stp->st_stateowner = sop;
2689         get_nfs4_file(fp);
2690         stp->st_file = fp;
2691         stp->st_stateid.si_boot = boot_time;
2692         stp->st_stateid.si_stateownerid = sop->so_id;
2693         stp->st_stateid.si_fileid = fp->fi_id;
2694         stp->st_stateid.si_generation = 0;
2695         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2696         stp->st_access_bmap = open_stp->st_access_bmap;
2697         stp->st_deny_bmap = open_stp->st_deny_bmap;
2698
2699 out:
2700         return stp;
2701 }
2702
2703 static int
2704 check_lock_length(u64 offset, u64 length)
2705 {
2706         return ((length == 0)  || ((length != ~(u64)0) &&
2707              LOFF_OVERFLOW(offset, length)));
2708 }
2709
2710 /*
2711  *  LOCK operation
2712  */
2713 int
2714 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2715 {
2716         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2717         struct nfs4_stateid *lock_stp;
2718         struct file *filp;
2719         struct file_lock file_lock;
2720         struct file_lock *conflock;
2721         int status = 0;
2722         unsigned int strhashval;
2723
2724         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2725                 (long long) lock->lk_offset,
2726                 (long long) lock->lk_length);
2727
2728         if (nfs4_in_grace() && !lock->lk_reclaim)
2729                 return nfserr_grace;
2730         if (!nfs4_in_grace() && lock->lk_reclaim)
2731                 return nfserr_no_grace;
2732
2733         if (check_lock_length(lock->lk_offset, lock->lk_length))
2734                  return nfserr_inval;
2735
2736         nfs4_lock_state();
2737
2738         if (lock->lk_is_new) {
2739         /*
2740          * Client indicates that this is a new lockowner.
2741          * Use open owner and open stateid to create lock owner and lock
2742          * stateid.
2743          */
2744                 struct nfs4_stateid *open_stp = NULL;
2745                 struct nfs4_file *fp;
2746
2747                 status = nfserr_stale_clientid;
2748                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2749                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2750                         goto out;
2751                 }
2752
2753                 /* is the new lock seqid presented by the client zero? */
2754                 status = nfserr_bad_seqid;
2755                 if (lock->v.new.lock_seqid != 0)
2756                         goto out;
2757
2758                 /* validate and update open stateid and open seqid */
2759                 status = nfs4_preprocess_seqid_op(current_fh,
2760                                         lock->lk_new_open_seqid,
2761                                         &lock->lk_new_open_stateid,
2762                                         CHECK_FH | OPEN_STATE,
2763                                         &open_sop, &open_stp,
2764                                         &lock->v.new.clientid);
2765                 if (status) {
2766                         if (lock->lk_reclaim)
2767                                 status = nfserr_reclaim_bad;
2768                         goto out;
2769                 }
2770                 /* create lockowner and lock stateid */
2771                 fp = open_stp->st_file;
2772                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2773                                 open_sop->so_client->cl_clientid.cl_id,
2774                                 &lock->v.new.owner);
2775                 /*
2776                  * If we already have this lock owner, the client is in
2777                  * error (or our bookeeping is wrong!)
2778                  * for asking for a 'new lock'.
2779                  */
2780                 status = nfserr_bad_stateid;
2781                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2782                                                 &lock->v.new.clientid);
2783                 if (lock_sop)
2784                         goto out;
2785                 status = nfserr_resource;
2786                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2787                         goto out;
2788                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2789                                                 fp, open_stp)) == NULL) {
2790                         release_stateowner(lock->lk_stateowner);
2791                         lock->lk_stateowner = NULL;
2792                         goto out;
2793                 }
2794                 /* bump the open seqid used to create the lock */
2795                 open_sop->so_seqid++;
2796         } else {
2797                 /* lock (lock owner + lock stateid) already exists */
2798                 status = nfs4_preprocess_seqid_op(current_fh,
2799                                        lock->lk_old_lock_seqid,
2800                                        &lock->lk_old_lock_stateid,
2801                                        CHECK_FH | LOCK_STATE,
2802                                        &lock->lk_stateowner, &lock_stp, NULL);
2803                 if (status)
2804                         goto out;
2805         }
2806         /* lock->lk_stateowner and lock_stp have been created or found */
2807         filp = lock_stp->st_vfs_file;
2808
2809         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2810                 printk("NFSD: nfsd4_lock: permission denied!\n");
2811                 goto out;
2812         }
2813
2814         locks_init_lock(&file_lock);
2815         switch (lock->lk_type) {
2816                 case NFS4_READ_LT:
2817                 case NFS4_READW_LT:
2818                         file_lock.fl_type = F_RDLCK;
2819                 break;
2820                 case NFS4_WRITE_LT:
2821                 case NFS4_WRITEW_LT:
2822                         file_lock.fl_type = F_WRLCK;
2823                 break;
2824                 default:
2825                         status = nfserr_inval;
2826                 goto out;
2827         }
2828         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2829         file_lock.fl_pid = current->tgid;
2830         file_lock.fl_file = filp;
2831         file_lock.fl_flags = FL_POSIX;
2832
2833         file_lock.fl_start = lock->lk_offset;
2834         if ((lock->lk_length == ~(u64)0) ||
2835                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2836                 file_lock.fl_end = ~(u64)0;
2837         else
2838                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2839         nfs4_transform_lock_offset(&file_lock);
2840
2841         /*
2842         * Try to lock the file in the VFS.
2843         * Note: locks.c uses the BKL to protect the inode's lock list.
2844         */
2845
2846         status = posix_lock_file(filp, &file_lock);
2847         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2848                 file_lock.fl_ops->fl_release_private(&file_lock);
2849         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2850         switch (-status) {
2851         case 0: /* success! */
2852                 update_stateid(&lock_stp->st_stateid);
2853                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2854                                 sizeof(stateid_t));
2855                 goto out;
2856         case (EAGAIN):
2857                 goto conflicting_lock;
2858         case (EDEADLK):
2859                 status = nfserr_deadlock;
2860         default:
2861                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2862                 goto out_destroy_new_stateid;
2863         }
2864
2865 conflicting_lock:
2866         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2867         status = nfserr_denied;
2868         /* XXX There is a race here. Future patch needed to provide
2869          * an atomic posix_lock_and_test_file
2870          */
2871         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2872                 status = nfserr_serverfault;
2873                 goto out;
2874         }
2875         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2876
2877 out_destroy_new_stateid:
2878         if (lock->lk_is_new) {
2879                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2880         /*
2881         * An error encountered after instantiation of the new
2882         * stateid has forced us to destroy it.
2883         */
2884                 if (!seqid_mutating_err(status))
2885                         open_sop->so_seqid--;
2886
2887                 release_state_owner(lock_stp, LOCK_STATE);
2888         }
2889 out:
2890         if (lock->lk_stateowner)
2891                 nfs4_get_stateowner(lock->lk_stateowner);
2892         nfs4_unlock_state();
2893         return status;
2894 }
2895
2896 /*
2897  * LOCKT operation
2898  */
2899 int
2900 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2901 {
2902         struct inode *inode;
2903         struct file file;
2904         struct file_lock file_lock;
2905         struct file_lock *conflicting_lock;
2906         int status;
2907
2908         if (nfs4_in_grace())
2909                 return nfserr_grace;
2910
2911         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2912                  return nfserr_inval;
2913
2914         lockt->lt_stateowner = NULL;
2915         nfs4_lock_state();
2916
2917         status = nfserr_stale_clientid;
2918         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2919                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2920                 goto out;
2921         }
2922
2923         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2924                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2925                 if (status == nfserr_symlink)
2926                         status = nfserr_inval;
2927                 goto out;
2928         }
2929
2930         inode = current_fh->fh_dentry->d_inode;
2931         locks_init_lock(&file_lock);
2932         switch (lockt->lt_type) {
2933                 case NFS4_READ_LT:
2934                 case NFS4_READW_LT:
2935                         file_lock.fl_type = F_RDLCK;
2936                 break;
2937                 case NFS4_WRITE_LT:
2938                 case NFS4_WRITEW_LT:
2939                         file_lock.fl_type = F_WRLCK;
2940                 break;
2941                 default:
2942                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2943                         status = nfserr_inval;
2944                 goto out;
2945         }
2946
2947         lockt->lt_stateowner = find_lockstateowner_str(inode,
2948                         &lockt->lt_clientid, &lockt->lt_owner);
2949         if (lockt->lt_stateowner)
2950                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2951         file_lock.fl_pid = current->tgid;
2952         file_lock.fl_flags = FL_POSIX;
2953
2954         file_lock.fl_start = lockt->lt_offset;
2955         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2956                 file_lock.fl_end = ~(u64)0;
2957         else
2958                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2959
2960         nfs4_transform_lock_offset(&file_lock);
2961
2962         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2963          * since LOCKT doesn't require an OPEN, and therefore a struct
2964          * file may not exist, pass posix_test_lock a struct file with
2965          * only the dentry:inode set.
2966          */
2967         memset(&file, 0, sizeof (struct file));
2968         file.f_dentry = current_fh->fh_dentry;
2969
2970         status = nfs_ok;
2971         conflicting_lock = posix_test_lock(&file, &file_lock);
2972         if (conflicting_lock) {
2973                 status = nfserr_denied;
2974                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2975         }
2976 out:
2977         nfs4_unlock_state();
2978         return status;
2979 }
2980
2981 int
2982 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2983 {
2984         struct nfs4_stateid *stp;
2985         struct file *filp = NULL;
2986         struct file_lock file_lock;
2987         int status;
2988
2989         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2990                 (long long) locku->lu_offset,
2991                 (long long) locku->lu_length);
2992
2993         if (check_lock_length(locku->lu_offset, locku->lu_length))
2994                  return nfserr_inval;
2995
2996         nfs4_lock_state();
2997
2998         if ((status = nfs4_preprocess_seqid_op(current_fh,
2999                                         locku->lu_seqid,
3000                                         &locku->lu_stateid,
3001                                         CHECK_FH | LOCK_STATE,
3002                                         &locku->lu_stateowner, &stp, NULL)))
3003                 goto out;
3004
3005         filp = stp->st_vfs_file;
3006         BUG_ON(!filp);
3007         locks_init_lock(&file_lock);
3008         file_lock.fl_type = F_UNLCK;
3009         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3010         file_lock.fl_pid = current->tgid;
3011         file_lock.fl_file = filp;
3012         file_lock.fl_flags = FL_POSIX;
3013         file_lock.fl_start = locku->lu_offset;
3014
3015         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
3016                 file_lock.fl_end = ~(u64)0;
3017         else
3018                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
3019         nfs4_transform_lock_offset(&file_lock);
3020
3021         /*
3022         *  Try to unlock the file in the VFS.
3023         */
3024         status = posix_lock_file(filp, &file_lock);
3025         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3026                 file_lock.fl_ops->fl_release_private(&file_lock);
3027         if (status) {
3028                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3029                 goto out_nfserr;
3030         }
3031         /*
3032         * OK, unlock succeeded; the only thing left to do is update the stateid.
3033         */
3034         update_stateid(&stp->st_stateid);
3035         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3036
3037 out:
3038         if (locku->lu_stateowner)
3039                 nfs4_get_stateowner(locku->lu_stateowner);
3040         nfs4_unlock_state();
3041         return status;
3042
3043 out_nfserr:
3044         status = nfserrno(status);
3045         goto out;
3046 }
3047
3048 /*
3049  * returns
3050  *      1: locks held by lockowner
3051  *      0: no locks held by lockowner
3052  */
3053 static int
3054 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3055 {
3056         struct file_lock **flpp;
3057         struct inode *inode = filp->f_dentry->d_inode;
3058         int status = 0;
3059
3060         lock_kernel();
3061         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3062                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3063                         status = 1;
3064                         goto out;
3065         }
3066 out:
3067         unlock_kernel();
3068         return status;
3069 }
3070
3071 int
3072 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3073 {
3074         clientid_t *clid = &rlockowner->rl_clientid;
3075         struct nfs4_stateowner *local = NULL;
3076         struct xdr_netobj *owner = &rlockowner->rl_owner;
3077         int status;
3078
3079         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3080                 clid->cl_boot, clid->cl_id);
3081
3082         /* XXX check for lease expiration */
3083
3084         status = nfserr_stale_clientid;
3085         if (STALE_CLIENTID(clid)) {
3086                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3087                 return status;
3088         }
3089
3090         nfs4_lock_state();
3091
3092         status = nfs_ok;
3093         local = find_lockstateowner(owner, clid);
3094         if (local) {
3095                 struct nfs4_stateid *stp;
3096
3097                 /* check for any locks held by any stateid
3098                  * associated with the (lock) stateowner */
3099                 status = nfserr_locks_held;
3100                 list_for_each_entry(stp, &local->so_perfilestate,
3101                                 st_perfilestate) {
3102                         if (check_for_locks(stp->st_vfs_file, local))
3103                                 goto out;
3104                 }
3105                 /* no locks held by (lock) stateowner */
3106                 status = nfs_ok;
3107                 release_stateowner(local);
3108         }
3109 out:
3110         nfs4_unlock_state();
3111         return status;
3112 }
3113
3114 static inline struct nfs4_client_reclaim *
3115 alloc_reclaim(void)
3116 {
3117         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3118 }
3119
3120 /*
3121  * failure => all reset bets are off, nfserr_no_grace...
3122  */
3123 static int
3124 nfs4_client_to_reclaim(char *name)
3125 {
3126         unsigned int strhashval;
3127         struct nfs4_client_reclaim *crp = NULL;
3128
3129         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3130         crp = alloc_reclaim();
3131         if (!crp)
3132                 return 0;
3133         strhashval = clientstr_hashval(name);
3134         INIT_LIST_HEAD(&crp->cr_strhash);
3135         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3136         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3137         reclaim_str_hashtbl_size++;
3138         return 1;
3139 }
3140
3141 static void
3142 nfs4_release_reclaim(void)
3143 {
3144         struct nfs4_client_reclaim *crp = NULL;
3145         int i;
3146
3147         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3148                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3149                         crp = list_entry(reclaim_str_hashtbl[i].next,
3150                                         struct nfs4_client_reclaim, cr_strhash);
3151                         list_del(&crp->cr_strhash);
3152                         kfree(crp);
3153                         reclaim_str_hashtbl_size--;
3154                 }
3155         }
3156         BUG_ON(reclaim_str_hashtbl_size);
3157 }
3158
3159 /*
3160  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3161 static struct nfs4_client_reclaim *
3162 nfs4_find_reclaim_client(clientid_t *clid)
3163 {
3164         unsigned int strhashval;
3165         struct nfs4_client *clp;
3166         struct nfs4_client_reclaim *crp = NULL;
3167
3168
3169         /* find clientid in conf_id_hashtbl */
3170         clp = find_confirmed_client(clid);
3171         if (clp == NULL)
3172                 return NULL;
3173
3174         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3175                             clp->cl_name.len, clp->cl_name.data,
3176                             clp->cl_recdir);
3177
3178         /* find clp->cl_name in reclaim_str_hashtbl */
3179         strhashval = clientstr_hashval(clp->cl_recdir);
3180         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3181                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3182                         return crp;
3183                 }
3184         }
3185         return NULL;
3186 }
3187
3188 /*
3189 * Called from OPEN. Look for clientid in reclaim list.
3190 */
3191 int
3192 nfs4_check_open_reclaim(clientid_t *clid)
3193 {
3194         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3195 }
3196
3197 /* initialization to perform at module load time: */
3198
3199 void
3200 nfs4_state_init(void)
3201 {
3202         int i;
3203
3204         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3205                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3206                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3207                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3208                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3209         }
3210         for (i = 0; i < FILE_HASH_SIZE; i++) {
3211                 INIT_LIST_HEAD(&file_hashtbl[i]);
3212         }
3213         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3214                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3215                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3216         }
3217         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3218                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3219                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3220         }
3221         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3222                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3223                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3224         }
3225         memset(&onestateid, ~0, sizeof(stateid_t));
3226         INIT_LIST_HEAD(&close_lru);
3227         INIT_LIST_HEAD(&client_lru);
3228         INIT_LIST_HEAD(&del_recall_lru);
3229         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3230                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3231         reclaim_str_hashtbl_size = 0;
3232 }
3233
3234 /* initialization to perform when the nfsd service is started: */
3235
3236 static void
3237 __nfs4_state_start(void)
3238 {
3239         time_t grace_time;
3240
3241         boot_time = get_seconds();
3242         grace_time = max(user_lease_time, lease_time);
3243         lease_time = user_lease_time;
3244         in_grace = 1;
3245         printk("NFSD: starting %ld-second grace period\n", grace_time);
3246         laundry_wq = create_singlethread_workqueue("nfsd4");
3247         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3248 }
3249
3250 int
3251 nfs4_state_start(void)
3252 {
3253         int status;
3254
3255         if (nfs4_init)
3256                 return 0;
3257         status = nfsd4_init_slabs();
3258         if (status)
3259                 return status;
3260         __nfs4_state_start();
3261         nfs4_init = 1;
3262         return 0;
3263 }
3264
3265 int
3266 nfs4_in_grace(void)
3267 {
3268         return in_grace;
3269 }
3270
3271 time_t
3272 nfs4_lease_time(void)
3273 {
3274         return lease_time;
3275 }
3276
3277 static void
3278 __nfs4_state_shutdown(void)
3279 {
3280         int i;
3281         struct nfs4_client *clp = NULL;
3282         struct nfs4_delegation *dp = NULL;
3283         struct nfs4_stateowner *sop = NULL;
3284         struct list_head *pos, *next, reaplist;
3285
3286         list_for_each_safe(pos, next, &close_lru) {
3287                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3288                 list_del(&sop->so_close_lru);
3289                 nfs4_put_stateowner(sop);
3290         }
3291
3292         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3293                 while (!list_empty(&conf_id_hashtbl[i])) {
3294                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3295                         expire_client(clp);
3296                 }
3297                 while (!list_empty(&unconf_str_hashtbl[i])) {
3298                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3299                         expire_client(clp);
3300                 }
3301         }
3302         INIT_LIST_HEAD(&reaplist);
3303         spin_lock(&recall_lock);
3304         list_for_each_safe(pos, next, &del_recall_lru) {
3305                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3306                 list_move(&dp->dl_recall_lru, &reaplist);
3307         }
3308         spin_unlock(&recall_lock);
3309         list_for_each_safe(pos, next, &reaplist) {
3310                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3311                 list_del_init(&dp->dl_recall_lru);
3312                 unhash_delegation(dp);
3313         }
3314
3315         cancel_delayed_work(&laundromat_work);
3316         flush_workqueue(laundry_wq);
3317         destroy_workqueue(laundry_wq);
3318         nfs4_init = 0;
3319 }
3320
3321 void
3322 nfs4_state_shutdown(void)
3323 {
3324         nfs4_lock_state();
3325         nfs4_release_reclaim();
3326         __nfs4_state_shutdown();
3327         nfsd4_free_slabs();
3328         nfs4_unlock_state();
3329 }
3330
3331 /*
3332  * Called when leasetime is changed.
3333  *
3334  * The only way the protocol gives us to handle on-the-fly lease changes is to
3335  * simulate a reboot.  Instead of doing that, we just wait till the next time
3336  * we start to register any changes in lease time.  If the administrator
3337  * really wants to change the lease time *now*, they can go ahead and bring
3338  * nfsd down and then back up again after changing the lease time.
3339  */
3340 void
3341 nfs4_reset_lease(time_t leasetime)
3342 {
3343         lock_kernel();
3344         user_lease_time = leasetime;
3345         unlock_kernel();
3346 }