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   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 #include <linux/namei.h>
  52 #include <linux/swap.h>
  53 #include <linux/mutex.h>
  54 #include <linux/lockd/bind.h>
  55 #include <linux/module.h>
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  58
  59 /* Globals */
  60 static time_t lease_time = 90;     /* default lease time */
  61 static time_t user_lease_time = 90;
  62 static time_t boot_time;
  63 static int in_grace = 1;
  64 static u32 current_clientid = 1;
  65 static u32 current_ownerid = 1;
  66 static u32 current_fileid = 1;
  67 static u32 current_delegid = 1;
  68 static u32 nfs4_init;
  69 static stateid_t zerostateid;             /* bits all 0 */
  70 static stateid_t onestateid;              /* bits all 1 */
  71
  72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
  73 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
  74
  75 /* forward declarations */
  76 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  77 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  78 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  79 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
  80 static void nfs4_set_recdir(char *recdir);
  81
  82 /* Locking:
  83  *
  84  * client_mutex:
  85  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  86  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  87  */
  88 static DEFINE_MUTEX(client_mutex);
  89
  90 static struct kmem_cache *stateowner_slab = NULL;
  91 static struct kmem_cache *file_slab = NULL;
  92 static struct kmem_cache *stateid_slab = NULL;
  93 static struct kmem_cache *deleg_slab = NULL;
  94
  95 void
  96 nfs4_lock_state(void)
  97 {
  98         mutex_lock(&client_mutex);
  99 }
 100
 101 void
 102 nfs4_unlock_state(void)
 103 {
 104         mutex_unlock(&client_mutex);
 105 }
 106
 107 static inline u32
 108 opaque_hashval(const void *ptr, int nbytes)
 109 {
 110         unsigned char *cptr = (unsigned char *) ptr;
 111
 112         u32 x = 0;
 113         while (nbytes--) {
 114                 x *= 37;
 115                 x += *cptr++;
 116         }
 117         return x;
 118 }
 119
 120 /* forward declarations */
 121 static void release_stateowner(struct nfs4_stateowner *sop);
 122 static void release_stateid(struct nfs4_stateid *stp, int flags);
 123
 124 /*
 125  * Delegation state
 126  */
 127
 128 /* recall_lock protects the del_recall_lru */
 129 static DEFINE_SPINLOCK(recall_lock);
 130 static struct list_head del_recall_lru;
 131
 132 static void
 133 free_nfs4_file(struct kref *kref)
 134 {
 135         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 136         list_del(&fp->fi_hash);
 137         iput(fp->fi_inode);
 138         kmem_cache_free(file_slab, fp);
 139 }
 140
 141 static inline void
 142 put_nfs4_file(struct nfs4_file *fi)
 143 {
 144         kref_put(&fi->fi_ref, free_nfs4_file);
 145 }
 146
 147 static inline void
 148 get_nfs4_file(struct nfs4_file *fi)
 149 {
 150         kref_get(&fi->fi_ref);
 151 }
 152
 153 static int num_delegations;
 154 unsigned int max_delegations;
 155
 156 /*
 157  * Open owner state (share locks)
 158  */
 159
 160 /* hash tables for nfs4_stateowner */
 161 #define OWNER_HASH_BITS              8
 162 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 163 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 164
 165 #define ownerid_hashval(id) \
 166         ((id) & OWNER_HASH_MASK)
 167 #define ownerstr_hashval(clientid, ownername) \
 168         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 169
 170 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 171 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 172
 173 /* hash table for nfs4_file */
 174 #define FILE_HASH_BITS                   8
 175 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 176 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 177 /* hash table for (open)nfs4_stateid */
 178 #define STATEID_HASH_BITS              10
 179 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 180 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 181
 182 #define file_hashval(x) \
 183         hash_ptr(x, FILE_HASH_BITS)
 184 #define stateid_hashval(owner_id, file_id)  \
 185         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 186
 187 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 188 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 189
 190 static struct nfs4_delegation *
 191 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 192 {
 193         struct nfs4_delegation *dp;
 194         struct nfs4_file *fp = stp->st_file;
 195         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 196
 197         dprintk("NFSD alloc_init_deleg\n");
 198         if (fp->fi_had_conflict)
 199                 return NULL;
 200         if (num_delegations > max_delegations)
 201                 return NULL;
 202         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 203         if (dp == NULL)
 204                 return dp;
 205         num_delegations++;
 206         INIT_LIST_HEAD(&dp->dl_perfile);
 207         INIT_LIST_HEAD(&dp->dl_perclnt);
 208         INIT_LIST_HEAD(&dp->dl_recall_lru);
 209         dp->dl_client = clp;
 210         get_nfs4_file(fp);
 211         dp->dl_file = fp;
 212         dp->dl_flock = NULL;
 213         get_file(stp->st_vfs_file);
 214         dp->dl_vfs_file = stp->st_vfs_file;
 215         dp->dl_type = type;
 216         dp->dl_recall.cbr_dp = NULL;
 217         dp->dl_recall.cbr_ident = cb->cb_ident;
 218         dp->dl_recall.cbr_trunc = 0;
 219         dp->dl_stateid.si_boot = boot_time;
 220         dp->dl_stateid.si_stateownerid = current_delegid++;
 221         dp->dl_stateid.si_fileid = 0;
 222         dp->dl_stateid.si_generation = 0;
 223         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 224         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 225                         current_fh->fh_handle.fh_size);
 226         dp->dl_time = 0;
 227         atomic_set(&dp->dl_count, 1);
 228         list_add(&dp->dl_perfile, &fp->fi_delegations);
 229         list_add(&dp->dl_perclnt, &clp->cl_delegations);
 230         return dp;
 231 }
 232
 233 void
 234 nfs4_put_delegation(struct nfs4_delegation *dp)
 235 {
 236         if (atomic_dec_and_test(&dp->dl_count)) {
 237                 dprintk("NFSD: freeing dp %p\n",dp);
 238                 put_nfs4_file(dp->dl_file);
 239                 kmem_cache_free(deleg_slab, dp);
 240                 num_delegations--;
 241         }
 242 }
 243
 244 /* Remove the associated file_lock first, then remove the delegation.
 245  * lease_modify() is called to remove the FS_LEASE file_lock from
 246  * the i_flock list, eventually calling nfsd's lock_manager
 247  * fl_release_callback.
 248  */
 249 static void
 250 nfs4_close_delegation(struct nfs4_delegation *dp)
 251 {
 252         struct file *filp = dp->dl_vfs_file;
 253
 254         dprintk("NFSD: close_delegation dp %p\n",dp);
 255         dp->dl_vfs_file = NULL;
 256         /* The following nfsd_close may not actually close the file,
 257          * but we want to remove the lease in any case. */
 258         if (dp->dl_flock)
 259                 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
 260         nfsd_close(filp);
 261 }
 262
 263 /* Called under the state lock. */
 264 static void
 265 unhash_delegation(struct nfs4_delegation *dp)
 266 {
 267         list_del_init(&dp->dl_perfile);
 268         list_del_init(&dp->dl_perclnt);
 269         spin_lock(&recall_lock);
 270         list_del_init(&dp->dl_recall_lru);
 271         spin_unlock(&recall_lock);
 272         nfs4_close_delegation(dp);
 273         nfs4_put_delegation(dp);
 274 }
 275
 276 /*
 277  * SETCLIENTID state
 278  */
 279
 280 /* Hash tables for nfs4_clientid state */
 281 #define CLIENT_HASH_BITS                 4
 282 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 283 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 284
 285 #define clientid_hashval(id) \
 286         ((id) & CLIENT_HASH_MASK)
 287 #define clientstr_hashval(name) \
 288         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
 289 /*
 290  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 291  * used in reboot/reset lease grace period processing
 292  *
 293  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 294  * setclientid_confirmed info.
 295  *
 296  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 297  * setclientid info.
 298  *
 299  * client_lru holds client queue ordered by nfs4_client.cl_time
 300  * for lease renewal.
 301  *
 302  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 303  * for last close replay.
 304  */
 305 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 306 static int reclaim_str_hashtbl_size = 0;
 307 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 308 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 309 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 310 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 311 static struct list_head client_lru;
 312 static struct list_head close_lru;
 313
 314 static inline void
 315 renew_client(struct nfs4_client *clp)
 316 {
 317         /*
 318         * Move client to the end to the LRU list.
 319         */
 320         dprintk("renewing client (clientid %08x/%08x)\n",
 321                         clp->cl_clientid.cl_boot,
 322                         clp->cl_clientid.cl_id);
 323         list_move_tail(&clp->cl_lru, &client_lru);
 324         clp->cl_time = get_seconds();
 325 }
 326
 327 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 328 static int
 329 STALE_CLIENTID(clientid_t *clid)
 330 {
 331         if (clid->cl_boot == boot_time)
 332                 return 0;
 333         dprintk("NFSD stale clientid (%08x/%08x)\n",
 334                         clid->cl_boot, clid->cl_id);
 335         return 1;
 336 }
 337
 338 /*
 339  * XXX Should we use a slab cache ?
 340  * This type of memory management is somewhat inefficient, but we use it
 341  * anyway since SETCLIENTID is not a common operation.
 342  */
 343 static inline struct nfs4_client *
 344 alloc_client(struct xdr_netobj name)
 345 {
 346         struct nfs4_client *clp;
 347
 348         if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 349                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 350                         memcpy(clp->cl_name.data, name.data, name.len);
 351                         clp->cl_name.len = name.len;
 352                 }
 353                 else {
 354                         kfree(clp);
 355                         clp = NULL;
 356                 }
 357         }
 358         return clp;
 359 }
 360
 361 static inline void
 362 free_client(struct nfs4_client *clp)
 363 {
 364         if (clp->cl_cred.cr_group_info)
 365                 put_group_info(clp->cl_cred.cr_group_info);
 366         kfree(clp->cl_name.data);
 367         kfree(clp);
 368 }
 369
 370 void
 371 put_nfs4_client(struct nfs4_client *clp)
 372 {
 373         if (atomic_dec_and_test(&clp->cl_count))
 374                 free_client(clp);
 375 }
 376
 377 static void
 378 shutdown_callback_client(struct nfs4_client *clp)
 379 {
 380         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 381
 382         /* shutdown rpc client, ending any outstanding recall rpcs */
 383         if (clnt) {
 384                 clp->cl_callback.cb_client = NULL;
 385                 rpc_shutdown_client(clnt);
 386         }
 387 }
 388
 389 static void
 390 expire_client(struct nfs4_client *clp)
 391 {
 392         struct nfs4_stateowner *sop;
 393         struct nfs4_delegation *dp;
 394         struct list_head reaplist;
 395
 396         dprintk("NFSD: expire_client cl_count %d\n",
 397                             atomic_read(&clp->cl_count));
 398
 399         shutdown_callback_client(clp);
 400
 401         INIT_LIST_HEAD(&reaplist);
 402         spin_lock(&recall_lock);
 403         while (!list_empty(&clp->cl_delegations)) {
 404                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
 405                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 406                                 dp->dl_flock);
 407                 list_del_init(&dp->dl_perclnt);
 408                 list_move(&dp->dl_recall_lru, &reaplist);
 409         }
 410         spin_unlock(&recall_lock);
 411         while (!list_empty(&reaplist)) {
 412                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 413                 list_del_init(&dp->dl_recall_lru);
 414                 unhash_delegation(dp);
 415         }
 416         list_del(&clp->cl_idhash);
 417         list_del(&clp->cl_strhash);
 418         list_del(&clp->cl_lru);
 419         while (!list_empty(&clp->cl_openowners)) {
 420                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
 421                 release_stateowner(sop);
 422         }
 423         put_nfs4_client(clp);
 424 }
 425
 426 static struct nfs4_client *
 427 create_client(struct xdr_netobj name, char *recdir) {
 428         struct nfs4_client *clp;
 429
 430         if (!(clp = alloc_client(name)))
 431                 goto out;
 432         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 433         atomic_set(&clp->cl_count, 1);
 434         atomic_set(&clp->cl_callback.cb_set, 0);
 435         INIT_LIST_HEAD(&clp->cl_idhash);
 436         INIT_LIST_HEAD(&clp->cl_strhash);
 437         INIT_LIST_HEAD(&clp->cl_openowners);
 438         INIT_LIST_HEAD(&clp->cl_delegations);
 439         INIT_LIST_HEAD(&clp->cl_lru);
 440 out:
 441         return clp;
 442 }
 443
 444 static void
 445 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 446         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 447 }
 448
 449 static void
 450 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 451         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 452         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 453 }
 454
 455 static void
 456 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 457
 458         target->cr_uid = source->cr_uid;
 459         target->cr_gid = source->cr_gid;
 460         target->cr_group_info = source->cr_group_info;
 461         get_group_info(target->cr_group_info);
 462 }
 463
 464 static inline int
 465 same_name(const char *n1, const char *n2)
 466 {
 467         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 468 }
 469
 470 static int
 471 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
 472 {
 473         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
 474 }
 475
 476 static int
 477 same_clid(clientid_t *cl1, clientid_t *cl2)
 478 {
 479         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
 480 }
 481
 482 /* XXX what about NGROUP */
 483 static int
 484 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
 485 {
 486         return cr1->cr_uid == cr2->cr_uid;
 487 }
 488
 489 static void
 490 gen_clid(struct nfs4_client *clp) {
 491         clp->cl_clientid.cl_boot = boot_time;
 492         clp->cl_clientid.cl_id = current_clientid++;
 493 }
 494
 495 static void
 496 gen_confirm(struct nfs4_client *clp) {
 497         struct timespec         tv;
 498         u32 *                   p;
 499
 500         tv = CURRENT_TIME;
 501         p = (u32 *)clp->cl_confirm.data;
 502         *p++ = tv.tv_sec;
 503         *p++ = tv.tv_nsec;
 504 }
 505
 506 static int
 507 check_name(struct xdr_netobj name) {
 508
 509         if (name.len == 0)
 510                 return 0;
 511         if (name.len > NFS4_OPAQUE_LIMIT) {
 512                 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
 513                 return 0;
 514         }
 515         return 1;
 516 }
 517
 518 static void
 519 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 520 {
 521         unsigned int idhashval;
 522
 523         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 524         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 525         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 526         list_add_tail(&clp->cl_lru, &client_lru);
 527         clp->cl_time = get_seconds();
 528 }
 529
 530 static void
 531 move_to_confirmed(struct nfs4_client *clp)
 532 {
 533         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 534         unsigned int strhashval;
 535
 536         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 537         list_del_init(&clp->cl_strhash);
 538         list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 539         strhashval = clientstr_hashval(clp->cl_recdir);
 540         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 541         renew_client(clp);
 542 }
 543
 544 static struct nfs4_client *
 545 find_confirmed_client(clientid_t *clid)
 546 {
 547         struct nfs4_client *clp;
 548         unsigned int idhashval = clientid_hashval(clid->cl_id);
 549
 550         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 551                 if (same_clid(&clp->cl_clientid, clid))
 552                         return clp;
 553         }
 554         return NULL;
 555 }
 556
 557 static struct nfs4_client *
 558 find_unconfirmed_client(clientid_t *clid)
 559 {
 560         struct nfs4_client *clp;
 561         unsigned int idhashval = clientid_hashval(clid->cl_id);
 562
 563         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 564                 if (same_clid(&clp->cl_clientid, clid))
 565                         return clp;
 566         }
 567         return NULL;
 568 }
 569
 570 static struct nfs4_client *
 571 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 572 {
 573         struct nfs4_client *clp;
 574
 575         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 576                 if (same_name(clp->cl_recdir, dname))
 577                         return clp;
 578         }
 579         return NULL;
 580 }
 581
 582 static struct nfs4_client *
 583 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 584 {
 585         struct nfs4_client *clp;
 586
 587         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 588                 if (same_name(clp->cl_recdir, dname))
 589                         return clp;
 590         }
 591         return NULL;
 592 }
 593
 594 /* a helper function for parse_callback */
 595 static int
 596 parse_octet(unsigned int *lenp, char **addrp)
 597 {
 598         unsigned int len = *lenp;
 599         char *p = *addrp;
 600         int n = -1;
 601         char c;
 602
 603         for (;;) {
 604                 if (!len)
 605                         break;
 606                 len--;
 607                 c = *p++;
 608                 if (c == '.')
 609                         break;
 610                 if ((c < '0') || (c > '9')) {
 611                         n = -1;
 612                         break;
 613                 }
 614                 if (n < 0)
 615                         n = 0;
 616                 n = (n * 10) + (c - '0');
 617                 if (n > 255) {
 618                         n = -1;
 619                         break;
 620                 }
 621         }
 622         *lenp = len;
 623         *addrp = p;
 624         return n;
 625 }
 626
 627 /* parse and set the setclientid ipv4 callback address */
 628 static int
 629 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 630 {
 631         int temp = 0;
 632         u32 cbaddr = 0;
 633         u16 cbport = 0;
 634         u32 addrlen = addr_len;
 635         char *addr = addr_val;
 636         int i, shift;
 637
 638         /* ipaddress */
 639         shift = 24;
 640         for(i = 4; i > 0  ; i--) {
 641                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 642                         return 0;
 643                 }
 644                 cbaddr |= (temp << shift);
 645                 if (shift > 0)
 646                 shift -= 8;
 647         }
 648         *cbaddrp = cbaddr;
 649
 650         /* port */
 651         shift = 8;
 652         for(i = 2; i > 0  ; i--) {
 653                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 654                         return 0;
 655                 }
 656                 cbport |= (temp << shift);
 657                 if (shift > 0)
 658                         shift -= 8;
 659         }
 660         *cbportp = cbport;
 661         return 1;
 662 }
 663
 664 static void
 665 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 666 {
 667         struct nfs4_callback *cb = &clp->cl_callback;
 668
 669         /* Currently, we only support tcp for the callback channel */
 670         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 671                 goto out_err;
 672
 673         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 674                          &cb->cb_addr, &cb->cb_port)))
 675                 goto out_err;
 676         cb->cb_prog = se->se_callback_prog;
 677         cb->cb_ident = se->se_callback_ident;
 678         return;
 679 out_err:
 680         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 681                 "will not receive delegations\n",
 682                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 683
 684         return;
 685 }
 686
 687 /*
 688  * RFC 3010 has a complex implmentation description of processing a
 689  * SETCLIENTID request consisting of 5 bullets, labeled as
 690  * CASE0 - CASE4 below.
 691  *
 692  * NOTES:
 693  *      callback information will be processed in a future patch
 694  *
 695  *      an unconfirmed record is added when:
 696  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 697  *      CASE 1: confirmed record found with matching name, principal,
 698  *              verifier, and clientid.
 699  *      CASE 2: confirmed record found with matching name, principal,
 700  *              and there is no unconfirmed record with matching
 701  *              name and principal
 702  *
 703  *      an unconfirmed record is replaced when:
 704  *      CASE 3: confirmed record found with matching name, principal,
 705  *              and an unconfirmed record is found with matching
 706  *              name, principal, and with clientid and
 707  *              confirm that does not match the confirmed record.
 708  *      CASE 4: there is no confirmed record with matching name and
 709  *              principal. there is an unconfirmed record with
 710  *              matching name, principal.
 711  *
 712  *      an unconfirmed record is deleted when:
 713  *      CASE 1: an unconfirmed record that matches input name, verifier,
 714  *              and confirmed clientid.
 715  *      CASE 4: any unconfirmed records with matching name and principal
 716  *              that exist after an unconfirmed record has been replaced
 717  *              as described above.
 718  *
 719  */
 720 __be32
 721 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 722                   struct nfsd4_setclientid *setclid)
 723 {
 724         struct sockaddr_in      *sin = svc_addr_in(rqstp);
 725         struct xdr_netobj       clname = {
 726                 .len = setclid->se_namelen,
 727                 .data = setclid->se_name,
 728         };
 729         nfs4_verifier           clverifier = setclid->se_verf;
 730         unsigned int            strhashval;
 731         struct nfs4_client      *conf, *unconf, *new;
 732         __be32                  status;
 733         char                    dname[HEXDIR_LEN];
 734
 735         if (!check_name(clname))
 736                 return nfserr_inval;
 737
 738         status = nfs4_make_rec_clidname(dname, &clname);
 739         if (status)
 740                 return status;
 741
 742         /*
 743          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 744          * We get here on a DRC miss.
 745          */
 746
 747         strhashval = clientstr_hashval(dname);
 748
 749         nfs4_lock_state();
 750         conf = find_confirmed_client_by_str(dname, strhashval);
 751         if (conf) {
 752                 /*
 753                  * CASE 0:
 754                  * clname match, confirmed, different principal
 755                  * or different ip_address
 756                  */
 757                 status = nfserr_clid_inuse;
 758                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
 759                                 || conf->cl_addr != sin->sin_addr.s_addr) {
 760                         dprintk("NFSD: setclientid: string in use by client"
 761                                 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
 762                         goto out;
 763                 }
 764         }
 765         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 766         status = nfserr_resource;
 767         if (!conf) {
 768                 /*
 769                  * CASE 4:
 770                  * placed first, because it is the normal case.
 771                  */
 772                 if (unconf)
 773                         expire_client(unconf);
 774                 new = create_client(clname, dname);
 775                 if (new == NULL)
 776                         goto out;
 777                 copy_verf(new, &clverifier);
 778                 new->cl_addr = sin->sin_addr.s_addr;
 779                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 780                 gen_clid(new);
 781                 gen_confirm(new);
 782                 gen_callback(new, setclid);
 783                 add_to_unconfirmed(new, strhashval);
 784         } else if (same_verf(&conf->cl_verifier, &clverifier)) {
 785                 /*
 786                  * CASE 1:
 787                  * cl_name match, confirmed, principal match
 788                  * verifier match: probable callback update
 789                  *
 790                  * remove any unconfirmed nfs4_client with
 791                  * matching cl_name, cl_verifier, and cl_clientid
 792                  *
 793                  * create and insert an unconfirmed nfs4_client with same
 794                  * cl_name, cl_verifier, and cl_clientid as existing
 795                  * nfs4_client,  but with the new callback info and a
 796                  * new cl_confirm
 797                  */
 798                 if (unconf) {
 799                         /* Note this is removing unconfirmed {*x***},
 800                          * which is stronger than RFC recommended {vxc**}.
 801                          * This has the advantage that there is at most
 802                          * one {*x***} in either list at any time.
 803                          */
 804                         expire_client(unconf);
 805                 }
 806                 new = create_client(clname, dname);
 807                 if (new == NULL)
 808                         goto out;
 809                 copy_verf(new,&conf->cl_verifier);
 810                 new->cl_addr = sin->sin_addr.s_addr;
 811                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 812                 copy_clid(new, conf);
 813                 gen_confirm(new);
 814                 gen_callback(new, setclid);
 815                 add_to_unconfirmed(new,strhashval);
 816         } else if (!unconf) {
 817                 /*
 818                  * CASE 2:
 819                  * clname match, confirmed, principal match
 820                  * verfier does not match
 821                  * no unconfirmed. create a new unconfirmed nfs4_client
 822                  * using input clverifier, clname, and callback info
 823                  * and generate a new cl_clientid and cl_confirm.
 824                  */
 825                 new = create_client(clname, dname);
 826                 if (new == NULL)
 827                         goto out;
 828                 copy_verf(new,&clverifier);
 829                 new->cl_addr = sin->sin_addr.s_addr;
 830                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 831                 gen_clid(new);
 832                 gen_confirm(new);
 833                 gen_callback(new, setclid);
 834                 add_to_unconfirmed(new, strhashval);
 835         } else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 836                 /*
 837                  * CASE3:
 838                  * confirmed found (name, principal match)
 839                  * confirmed verifier does not match input clverifier
 840                  *
 841                  * unconfirmed found (name match)
 842                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 843                  *
 844                  * remove unconfirmed.
 845                  *
 846                  * create an unconfirmed nfs4_client
 847                  * with same cl_name as existing confirmed nfs4_client,
 848                  * but with new callback info, new cl_clientid,
 849                  * new cl_verifier and a new cl_confirm
 850                  */
 851                 expire_client(unconf);
 852                 new = create_client(clname, dname);
 853                 if (new == NULL)
 854                         goto out;
 855                 copy_verf(new,&clverifier);
 856                 new->cl_addr = sin->sin_addr.s_addr;
 857                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 858                 gen_clid(new);
 859                 gen_confirm(new);
 860                 gen_callback(new, setclid);
 861                 add_to_unconfirmed(new, strhashval);
 862         } else {
 863                 /* No cases hit !!! */
 864                 status = nfserr_inval;
 865                 goto out;
 866
 867         }
 868         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 869         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 870         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 871         status = nfs_ok;
 872 out:
 873         nfs4_unlock_state();
 874         return status;
 875 }
 876
 877
 878 /*
 879  * RFC 3010 has a complex implmentation description of processing a
 880  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 881  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 882  *
 883  * NOTE: callback information will be processed here in a future patch
 884  */
 885 __be32
 886 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 887                          struct nfsd4_compound_state *cstate,
 888                          struct nfsd4_setclientid_confirm *setclientid_confirm)
 889 {
 890         struct sockaddr_in *sin = svc_addr_in(rqstp);
 891         struct nfs4_client *conf, *unconf;
 892         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 893         clientid_t * clid = &setclientid_confirm->sc_clientid;
 894         __be32 status;
 895
 896         if (STALE_CLIENTID(clid))
 897                 return nfserr_stale_clientid;
 898         /*
 899          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 900          * We get here on a DRC miss.
 901          */
 902
 903         nfs4_lock_state();
 904
 905         conf = find_confirmed_client(clid);
 906         unconf = find_unconfirmed_client(clid);
 907
 908         status = nfserr_clid_inuse;
 909         if (conf && conf->cl_addr != sin->sin_addr.s_addr)
 910                 goto out;
 911         if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
 912                 goto out;
 913
 914         if ((conf && unconf) &&
 915             (same_verf(&unconf->cl_confirm, &confirm)) &&
 916             (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 917             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 918             (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 919                 /* CASE 1:
 920                 * unconf record that matches input clientid and input confirm.
 921                 * conf record that matches input clientid.
 922                 * conf and unconf records match names, verifiers
 923                 */
 924                 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
 925                         status = nfserr_clid_inuse;
 926                 else {
 927                         /* XXX: We just turn off callbacks until we can handle
 928                           * change request correctly. */
 929                         atomic_set(&conf->cl_callback.cb_set, 0);
 930                         gen_confirm(conf);
 931                         nfsd4_remove_clid_dir(unconf);
 932                         expire_client(unconf);
 933                         status = nfs_ok;
 934
 935                 }
 936         } else if ((conf && !unconf) ||
 937             ((conf && unconf) &&
 938              (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 939               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 940                 /* CASE 2:
 941                  * conf record that matches input clientid.
 942                  * if unconf record matches input clientid, then
 943                  * unconf->cl_name or unconf->cl_verifier don't match the
 944                  * conf record.
 945                  */
 946                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
 947                         status = nfserr_clid_inuse;
 948                 else
 949                         status = nfs_ok;
 950         } else if (!conf && unconf
 951                         && same_verf(&unconf->cl_confirm, &confirm)) {
 952                 /* CASE 3:
 953                  * conf record not found.
 954                  * unconf record found.
 955                  * unconf->cl_confirm matches input confirm
 956                  */
 957                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 958                         status = nfserr_clid_inuse;
 959                 } else {
 960                         unsigned int hash =
 961                                 clientstr_hashval(unconf->cl_recdir);
 962                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 963                                                                         hash);
 964                         if (conf) {
 965                                 nfsd4_remove_clid_dir(conf);
 966                                 expire_client(conf);
 967                         }
 968                         move_to_confirmed(unconf);
 969                         conf = unconf;
 970                         status = nfs_ok;
 971                 }
 972         } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
 973             && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
 974                                                                 &confirm)))) {
 975                 /* CASE 4:
 976                  * conf record not found, or if conf, conf->cl_confirm does not
 977                  * match input confirm.
 978                  * unconf record not found, or if unconf, unconf->cl_confirm
 979                  * does not match input confirm.
 980                  */
 981                 status = nfserr_stale_clientid;
 982         } else {
 983                 /* check that we have hit one of the cases...*/
 984                 status = nfserr_clid_inuse;
 985         }
 986 out:
 987         if (!status)
 988                 nfsd4_probe_callback(conf);
 989         nfs4_unlock_state();
 990         return status;
 991 }
 992
 993 /* OPEN Share state helper functions */
 994 static inline struct nfs4_file *
 995 alloc_init_file(struct inode *ino)
 996 {
 997         struct nfs4_file *fp;
 998         unsigned int hashval = file_hashval(ino);
 999
1000         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1001         if (fp) {
1002                 kref_init(&fp->fi_ref);
1003                 INIT_LIST_HEAD(&fp->fi_hash);
1004                 INIT_LIST_HEAD(&fp->fi_stateids);
1005                 INIT_LIST_HEAD(&fp->fi_delegations);
1006                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1007                 fp->fi_inode = igrab(ino);
1008                 fp->fi_id = current_fileid++;
1009                 fp->fi_had_conflict = false;
1010                 return fp;
1011         }
1012         return NULL;
1013 }
1014
1015 static void
1016 nfsd4_free_slab(struct kmem_cache **slab)
1017 {
1018         if (*slab == NULL)
1019                 return;
1020         kmem_cache_destroy(*slab);
1021         *slab = NULL;
1022 }
1023
1024 static void
1025 nfsd4_free_slabs(void)
1026 {
1027         nfsd4_free_slab(&stateowner_slab);
1028         nfsd4_free_slab(&file_slab);
1029         nfsd4_free_slab(&stateid_slab);
1030         nfsd4_free_slab(&deleg_slab);
1031 }
1032
1033 static int
1034 nfsd4_init_slabs(void)
1035 {
1036         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1037                         sizeof(struct nfs4_stateowner), 0, 0, NULL);
1038         if (stateowner_slab == NULL)
1039                 goto out_nomem;
1040         file_slab = kmem_cache_create("nfsd4_files",
1041                         sizeof(struct nfs4_file), 0, 0, NULL);
1042         if (file_slab == NULL)
1043                 goto out_nomem;
1044         stateid_slab = kmem_cache_create("nfsd4_stateids",
1045                         sizeof(struct nfs4_stateid), 0, 0, NULL);
1046         if (stateid_slab == NULL)
1047                 goto out_nomem;
1048         deleg_slab = kmem_cache_create("nfsd4_delegations",
1049                         sizeof(struct nfs4_delegation), 0, 0, NULL);
1050         if (deleg_slab == NULL)
1051                 goto out_nomem;
1052         return 0;
1053 out_nomem:
1054         nfsd4_free_slabs();
1055         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1056         return -ENOMEM;
1057 }
1058
1059 void
1060 nfs4_free_stateowner(struct kref *kref)
1061 {
1062         struct nfs4_stateowner *sop =
1063                 container_of(kref, struct nfs4_stateowner, so_ref);
1064         kfree(sop->so_owner.data);
1065         kmem_cache_free(stateowner_slab, sop);
1066 }
1067
1068 static inline struct nfs4_stateowner *
1069 alloc_stateowner(struct xdr_netobj *owner)
1070 {
1071         struct nfs4_stateowner *sop;
1072
1073         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1074                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1075                         memcpy(sop->so_owner.data, owner->data, owner->len);
1076                         sop->so_owner.len = owner->len;
1077                         kref_init(&sop->so_ref);
1078                         return sop;
1079                 }
1080                 kmem_cache_free(stateowner_slab, sop);
1081         }
1082         return NULL;
1083 }
1084
1085 static struct nfs4_stateowner *
1086 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1087         struct nfs4_stateowner *sop;
1088         struct nfs4_replay *rp;
1089         unsigned int idhashval;
1090
1091         if (!(sop = alloc_stateowner(&open->op_owner)))
1092                 return NULL;
1093         idhashval = ownerid_hashval(current_ownerid);
1094         INIT_LIST_HEAD(&sop->so_idhash);
1095         INIT_LIST_HEAD(&sop->so_strhash);
1096         INIT_LIST_HEAD(&sop->so_perclient);
1097         INIT_LIST_HEAD(&sop->so_stateids);
1098         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1099         INIT_LIST_HEAD(&sop->so_close_lru);
1100         sop->so_time = 0;
1101         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1102         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1103         list_add(&sop->so_perclient, &clp->cl_openowners);
1104         sop->so_is_open_owner = 1;
1105         sop->so_id = current_ownerid++;
1106         sop->so_client = clp;
1107         sop->so_seqid = open->op_seqid;
1108         sop->so_confirmed = 0;
1109         rp = &sop->so_replay;
1110         rp->rp_status = nfserr_serverfault;
1111         rp->rp_buflen = 0;
1112         rp->rp_buf = rp->rp_ibuf;
1113         return sop;
1114 }
1115
1116 static void
1117 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1118 {
1119         struct nfs4_stateowner *lock_sop;
1120
1121         while (!list_empty(&open_stp->st_lockowners)) {
1122                 lock_sop = list_entry(open_stp->st_lockowners.next,
1123                                 struct nfs4_stateowner, so_perstateid);
1124                 /* list_del(&open_stp->st_lockowners);  */
1125                 BUG_ON(lock_sop->so_is_open_owner);
1126                 release_stateowner(lock_sop);
1127         }
1128 }
1129
1130 static void
1131 unhash_stateowner(struct nfs4_stateowner *sop)
1132 {
1133         struct nfs4_stateid *stp;
1134
1135         list_del(&sop->so_idhash);
1136         list_del(&sop->so_strhash);
1137         if (sop->so_is_open_owner)
1138                 list_del(&sop->so_perclient);
1139         list_del(&sop->so_perstateid);
1140         while (!list_empty(&sop->so_stateids)) {
1141                 stp = list_entry(sop->so_stateids.next,
1142                         struct nfs4_stateid, st_perstateowner);
1143                 if (sop->so_is_open_owner)
1144                         release_stateid(stp, OPEN_STATE);
1145                 else
1146                         release_stateid(stp, LOCK_STATE);
1147         }
1148 }
1149
1150 static void
1151 release_stateowner(struct nfs4_stateowner *sop)
1152 {
1153         unhash_stateowner(sop);
1154         list_del(&sop->so_close_lru);
1155         nfs4_put_stateowner(sop);
1156 }
1157
1158 static inline void
1159 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1160         struct nfs4_stateowner *sop = open->op_stateowner;
1161         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1162
1163         INIT_LIST_HEAD(&stp->st_hash);
1164         INIT_LIST_HEAD(&stp->st_perstateowner);
1165         INIT_LIST_HEAD(&stp->st_lockowners);
1166         INIT_LIST_HEAD(&stp->st_perfile);
1167         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1168         list_add(&stp->st_perstateowner, &sop->so_stateids);
1169         list_add(&stp->st_perfile, &fp->fi_stateids);
1170         stp->st_stateowner = sop;
1171         get_nfs4_file(fp);
1172         stp->st_file = fp;
1173         stp->st_stateid.si_boot = boot_time;
1174         stp->st_stateid.si_stateownerid = sop->so_id;
1175         stp->st_stateid.si_fileid = fp->fi_id;
1176         stp->st_stateid.si_generation = 0;
1177         stp->st_access_bmap = 0;
1178         stp->st_deny_bmap = 0;
1179         __set_bit(open->op_share_access, &stp->st_access_bmap);
1180         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1181         stp->st_openstp = NULL;
1182 }
1183
1184 static void
1185 release_stateid(struct nfs4_stateid *stp, int flags)
1186 {
1187         struct file *filp = stp->st_vfs_file;
1188
1189         list_del(&stp->st_hash);
1190         list_del(&stp->st_perfile);
1191         list_del(&stp->st_perstateowner);
1192         if (flags & OPEN_STATE) {
1193                 release_stateid_lockowners(stp);
1194                 stp->st_vfs_file = NULL;
1195                 nfsd_close(filp);
1196         } else if (flags & LOCK_STATE)
1197                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1198         put_nfs4_file(stp->st_file);
1199         kmem_cache_free(stateid_slab, stp);
1200 }
1201
1202 static void
1203 move_to_close_lru(struct nfs4_stateowner *sop)
1204 {
1205         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1206
1207         list_move_tail(&sop->so_close_lru, &close_lru);
1208         sop->so_time = get_seconds();
1209 }
1210
1211 static int
1212 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1213                                                         clientid_t *clid)
1214 {
1215         return (sop->so_owner.len == owner->len) &&
1216                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1217                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1218 }
1219
1220 static struct nfs4_stateowner *
1221 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1222 {
1223         struct nfs4_stateowner *so = NULL;
1224
1225         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1226                 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1227                         return so;
1228         }
1229         return NULL;
1230 }
1231
1232 /* search file_hashtbl[] for file */
1233 static struct nfs4_file *
1234 find_file(struct inode *ino)
1235 {
1236         unsigned int hashval = file_hashval(ino);
1237         struct nfs4_file *fp;
1238
1239         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1240                 if (fp->fi_inode == ino) {
1241                         get_nfs4_file(fp);
1242                         return fp;
1243                 }
1244         }
1245         return NULL;
1246 }
1247
1248 static int access_valid(u32 x)
1249 {
1250         return (x > 0 && x < 4);
1251 }
1252
1253 static int deny_valid(u32 x)
1254 {
1255         return (x >= 0 && x < 5);
1256 }
1257
1258 static void
1259 set_access(unsigned int *access, unsigned long bmap) {
1260         int i;
1261
1262         *access = 0;
1263         for (i = 1; i < 4; i++) {
1264                 if (test_bit(i, &bmap))
1265                         *access |= i;
1266         }
1267 }
1268
1269 static void
1270 set_deny(unsigned int *deny, unsigned long bmap) {
1271         int i;
1272
1273         *deny = 0;
1274         for (i = 0; i < 4; i++) {
1275                 if (test_bit(i, &bmap))
1276                         *deny |= i ;
1277         }
1278 }
1279
1280 static int
1281 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1282         unsigned int access, deny;
1283
1284         set_access(&access, stp->st_access_bmap);
1285         set_deny(&deny, stp->st_deny_bmap);
1286         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1287                 return 0;
1288         return 1;
1289 }
1290
1291 /*
1292  * Called to check deny when READ with all zero stateid or
1293  * WRITE with all zero or all one stateid
1294  */
1295 static __be32
1296 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1297 {
1298         struct inode *ino = current_fh->fh_dentry->d_inode;
1299         struct nfs4_file *fp;
1300         struct nfs4_stateid *stp;
1301         __be32 ret;
1302
1303         dprintk("NFSD: nfs4_share_conflict\n");
1304
1305         fp = find_file(ino);
1306         if (!fp)
1307                 return nfs_ok;
1308         ret = nfserr_locked;
1309         /* Search for conflicting share reservations */
1310         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1311                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1312                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1313                         goto out;
1314         }
1315         ret = nfs_ok;
1316 out:
1317         put_nfs4_file(fp);
1318         return ret;
1319 }
1320
1321 static inline void
1322 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1323 {
1324         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1325                 put_write_access(filp->f_path.dentry->d_inode);
1326                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1327         }
1328 }
1329
1330 /*
1331  * Recall a delegation
1332  */
1333 static int
1334 do_recall(void *__dp)
1335 {
1336         struct nfs4_delegation *dp = __dp;
1337
1338         dp->dl_file->fi_had_conflict = true;
1339         nfsd4_cb_recall(dp);
1340         return 0;
1341 }
1342
1343 /*
1344  * Spawn a thread to perform a recall on the delegation represented
1345  * by the lease (file_lock)
1346  *
1347  * Called from break_lease() with lock_kernel() held.
1348  * Note: we assume break_lease will only call this *once* for any given
1349  * lease.
1350  */
1351 static
1352 void nfsd_break_deleg_cb(struct file_lock *fl)
1353 {
1354         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1355         struct task_struct *t;
1356
1357         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1358         if (!dp)
1359                 return;
1360
1361         /* We're assuming the state code never drops its reference
1362          * without first removing the lease.  Since we're in this lease
1363          * callback (and since the lease code is serialized by the kernel
1364          * lock) we know the server hasn't removed the lease yet, we know
1365          * it's safe to take a reference: */
1366         atomic_inc(&dp->dl_count);
1367
1368         spin_lock(&recall_lock);
1369         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1370         spin_unlock(&recall_lock);
1371
1372         /* only place dl_time is set. protected by lock_kernel*/
1373         dp->dl_time = get_seconds();
1374
1375         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1376         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1377
1378         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1379         if (IS_ERR(t)) {
1380                 struct nfs4_client *clp = dp->dl_client;
1381
1382                 printk(KERN_INFO "NFSD: Callback thread failed for "
1383                         "for client (clientid %08x/%08x)\n",
1384                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1385                 nfs4_put_delegation(dp);
1386         }
1387 }
1388
1389 /*
1390  * The file_lock is being reapd.
1391  *
1392  * Called by locks_free_lock() with lock_kernel() held.
1393  */
1394 static
1395 void nfsd_release_deleg_cb(struct file_lock *fl)
1396 {
1397         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1398
1399         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1400
1401         if (!(fl->fl_flags & FL_LEASE) || !dp)
1402                 return;
1403         dp->dl_flock = NULL;
1404 }
1405
1406 /*
1407  * Set the delegation file_lock back pointer.
1408  *
1409  * Called from setlease() with lock_kernel() held.
1410  */
1411 static
1412 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1413 {
1414         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1415
1416         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1417         if (!dp)
1418                 return;
1419         dp->dl_flock = new;
1420 }
1421
1422 /*
1423  * Called from setlease() with lock_kernel() held
1424  */
1425 static
1426 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1427 {
1428         struct nfs4_delegation *onlistd =
1429                 (struct nfs4_delegation *)onlist->fl_owner;
1430         struct nfs4_delegation *tryd =
1431                 (struct nfs4_delegation *)try->fl_owner;
1432
1433         if (onlist->fl_lmops != try->fl_lmops)
1434                 return 0;
1435
1436         return onlistd->dl_client == tryd->dl_client;
1437 }
1438
1439
1440 static
1441 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1442 {
1443         if (arg & F_UNLCK)
1444                 return lease_modify(onlist, arg);
1445         else
1446                 return -EAGAIN;
1447 }
1448
1449 static struct lock_manager_operations nfsd_lease_mng_ops = {
1450         .fl_break = nfsd_break_deleg_cb,
1451         .fl_release_private = nfsd_release_deleg_cb,
1452         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1453         .fl_mylease = nfsd_same_client_deleg_cb,
1454         .fl_change = nfsd_change_deleg_cb,
1455 };
1456
1457
1458 __be32
1459 nfsd4_process_open1(struct nfsd4_open *open)
1460 {
1461         clientid_t *clientid = &open->op_clientid;
1462         struct nfs4_client *clp = NULL;
1463         unsigned int strhashval;
1464         struct nfs4_stateowner *sop = NULL;
1465
1466         if (!check_name(open->op_owner))
1467                 return nfserr_inval;
1468
1469         if (STALE_CLIENTID(&open->op_clientid))
1470                 return nfserr_stale_clientid;
1471
1472         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1473         sop = find_openstateowner_str(strhashval, open);
1474         open->op_stateowner = sop;
1475         if (!sop) {
1476                 /* Make sure the client's lease hasn't expired. */
1477                 clp = find_confirmed_client(clientid);
1478                 if (clp == NULL)
1479                         return nfserr_expired;
1480                 goto renew;
1481         }
1482         if (!sop->so_confirmed) {
1483                 /* Replace unconfirmed owners without checking for replay. */
1484                 clp = sop->so_client;
1485                 release_stateowner(sop);
1486                 open->op_stateowner = NULL;
1487                 goto renew;
1488         }
1489         if (open->op_seqid == sop->so_seqid - 1) {
1490                 if (sop->so_replay.rp_buflen)
1491                         return nfserr_replay_me;
1492                 /* The original OPEN failed so spectacularly
1493                  * that we don't even have replay data saved!
1494                  * Therefore, we have no choice but to continue
1495                  * processing this OPEN; presumably, we'll
1496                  * fail again for the same reason.
1497                  */
1498                 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1499                 goto renew;
1500         }
1501         if (open->op_seqid != sop->so_seqid)
1502                 return nfserr_bad_seqid;
1503 renew:
1504         if (open->op_stateowner == NULL) {
1505                 sop = alloc_init_open_stateowner(strhashval, clp, open);
1506                 if (sop == NULL)
1507                         return nfserr_resource;
1508                 open->op_stateowner = sop;
1509         }
1510         list_del_init(&sop->so_close_lru);
1511         renew_client(sop->so_client);
1512         return nfs_ok;
1513 }
1514
1515 static inline __be32
1516 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1517 {
1518         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1519                 return nfserr_openmode;
1520         else
1521                 return nfs_ok;
1522 }
1523
1524 static struct nfs4_delegation *
1525 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1526 {
1527         struct nfs4_delegation *dp;
1528
1529         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1530                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1531                         return dp;
1532         }
1533         return NULL;
1534 }
1535
1536 static __be32
1537 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1538                 struct nfs4_delegation **dp)
1539 {
1540         int flags;
1541         __be32 status = nfserr_bad_stateid;
1542
1543         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1544         if (*dp == NULL)
1545                 goto out;
1546         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1547                                                 RD_STATE : WR_STATE;
1548         status = nfs4_check_delegmode(*dp, flags);
1549         if (status)
1550                 *dp = NULL;
1551 out:
1552         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1553                 return nfs_ok;
1554         if (status)
1555                 return status;
1556         open->op_stateowner->so_confirmed = 1;
1557         return nfs_ok;
1558 }
1559
1560 static __be32
1561 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1562 {
1563         struct nfs4_stateid *local;
1564         __be32 status = nfserr_share_denied;
1565         struct nfs4_stateowner *sop = open->op_stateowner;
1566
1567         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1568                 /* ignore lock owners */
1569                 if (local->st_stateowner->so_is_open_owner == 0)
1570                         continue;
1571                 /* remember if we have seen this open owner */
1572                 if (local->st_stateowner == sop)
1573                         *stpp = local;
1574                 /* check for conflicting share reservations */
1575                 if (!test_share(local, open))
1576                         goto out;
1577         }
1578         status = 0;
1579 out:
1580         return status;
1581 }
1582
1583 static inline struct nfs4_stateid *
1584 nfs4_alloc_stateid(void)
1585 {
1586         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1587 }
1588
1589 static __be32
1590 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1591                 struct nfs4_delegation *dp,
1592                 struct svc_fh *cur_fh, int flags)
1593 {
1594         struct nfs4_stateid *stp;
1595
1596         stp = nfs4_alloc_stateid();
1597         if (stp == NULL)
1598                 return nfserr_resource;
1599
1600         if (dp) {
1601                 get_file(dp->dl_vfs_file);
1602                 stp->st_vfs_file = dp->dl_vfs_file;
1603         } else {
1604                 __be32 status;
1605                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1606                                 &stp->st_vfs_file);
1607                 if (status) {
1608                         if (status == nfserr_dropit)
1609                                 status = nfserr_jukebox;
1610                         kmem_cache_free(stateid_slab, stp);
1611                         return status;
1612                 }
1613         }
1614         *stpp = stp;
1615         return 0;
1616 }
1617
1618 static inline __be32
1619 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1620                 struct nfsd4_open *open)
1621 {
1622         struct iattr iattr = {
1623                 .ia_valid = ATTR_SIZE,
1624                 .ia_size = 0,
1625         };
1626         if (!open->op_truncate)
1627                 return 0;
1628         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1629                 return nfserr_inval;
1630         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1631 }
1632
1633 static __be32
1634 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1635 {
1636         struct file *filp = stp->st_vfs_file;
1637         struct inode *inode = filp->f_path.dentry->d_inode;
1638         unsigned int share_access, new_writer;
1639         __be32 status;
1640
1641         set_access(&share_access, stp->st_access_bmap);
1642         new_writer = (~share_access) & open->op_share_access
1643                         & NFS4_SHARE_ACCESS_WRITE;
1644
1645         if (new_writer) {
1646                 int err = get_write_access(inode);
1647                 if (err)
1648                         return nfserrno(err);
1649         }
1650         status = nfsd4_truncate(rqstp, cur_fh, open);
1651         if (status) {
1652                 if (new_writer)
1653                         put_write_access(inode);
1654                 return status;
1655         }
1656         /* remember the open */
1657         filp->f_mode |= open->op_share_access;
1658         set_bit(open->op_share_access, &stp->st_access_bmap);
1659         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1660
1661         return nfs_ok;
1662 }
1663
1664
1665 static void
1666 nfs4_set_claim_prev(struct nfsd4_open *open)
1667 {
1668         open->op_stateowner->so_confirmed = 1;
1669         open->op_stateowner->so_client->cl_firststate = 1;
1670 }
1671
1672 /*
1673  * Attempt to hand out a delegation.
1674  */
1675 static void
1676 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1677 {
1678         struct nfs4_delegation *dp;
1679         struct nfs4_stateowner *sop = stp->st_stateowner;
1680         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1681         struct file_lock fl, *flp = &fl;
1682         int status, flag = 0;
1683
1684         flag = NFS4_OPEN_DELEGATE_NONE;
1685         open->op_recall = 0;
1686         switch (open->op_claim_type) {
1687                 case NFS4_OPEN_CLAIM_PREVIOUS:
1688                         if (!atomic_read(&cb->cb_set))
1689                                 open->op_recall = 1;
1690                         flag = open->op_delegate_type;
1691                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1692                                 goto out;
1693                         break;
1694                 case NFS4_OPEN_CLAIM_NULL:
1695                         /* Let's not give out any delegations till everyone's
1696                          * had the chance to reclaim theirs.... */
1697                         if (nfs4_in_grace())
1698                                 goto out;
1699                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1700                                 goto out;
1701                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1702                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1703                         else
1704                                 flag = NFS4_OPEN_DELEGATE_READ;
1705                         break;
1706                 default:
1707                         goto out;
1708         }
1709
1710         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1711         if (dp == NULL) {
1712                 flag = NFS4_OPEN_DELEGATE_NONE;
1713                 goto out;
1714         }
1715         locks_init_lock(&fl);
1716         fl.fl_lmops = &nfsd_lease_mng_ops;
1717         fl.fl_flags = FL_LEASE;
1718         fl.fl_end = OFFSET_MAX;
1719         fl.fl_owner =  (fl_owner_t)dp;
1720         fl.fl_file = stp->st_vfs_file;
1721         fl.fl_pid = current->tgid;
1722
1723         /* vfs_setlease checks to see if delegation should be handed out.
1724          * the lock_manager callbacks fl_mylease and fl_change are used
1725          */
1726         if ((status = vfs_setlease(stp->st_vfs_file,
1727                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1728                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1729                 unhash_delegation(dp);
1730                 flag = NFS4_OPEN_DELEGATE_NONE;
1731                 goto out;
1732         }
1733
1734         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1735
1736         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1737                      dp->dl_stateid.si_boot,
1738                      dp->dl_stateid.si_stateownerid,
1739                      dp->dl_stateid.si_fileid,
1740                      dp->dl_stateid.si_generation);
1741 out:
1742         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1743                         && flag == NFS4_OPEN_DELEGATE_NONE
1744                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1745                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1746         open->op_delegate_type = flag;
1747 }
1748
1749 /*
1750  * called with nfs4_lock_state() held.
1751  */
1752 __be32
1753 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1754 {
1755         struct nfs4_file *fp = NULL;
1756         struct inode *ino = current_fh->fh_dentry->d_inode;
1757         struct nfs4_stateid *stp = NULL;
1758         struct nfs4_delegation *dp = NULL;
1759         __be32 status;
1760
1761         status = nfserr_inval;
1762         if (!access_valid(open->op_share_access)
1763                         || !deny_valid(open->op_share_deny))
1764                 goto out;
1765         /*
1766          * Lookup file; if found, lookup stateid and check open request,
1767          * and check for delegations in the process of being recalled.
1768          * If not found, create the nfs4_file struct
1769          */
1770         fp = find_file(ino);
1771         if (fp) {
1772                 if ((status = nfs4_check_open(fp, open, &stp)))
1773                         goto out;
1774                 status = nfs4_check_deleg(fp, open, &dp);
1775                 if (status)
1776                         goto out;
1777         } else {
1778                 status = nfserr_bad_stateid;
1779                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1780                         goto out;
1781                 status = nfserr_resource;
1782                 fp = alloc_init_file(ino);
1783                 if (fp == NULL)
1784                         goto out;
1785         }
1786
1787         /*
1788          * OPEN the file, or upgrade an existing OPEN.
1789          * If truncate fails, the OPEN fails.
1790          */
1791         if (stp) {
1792                 /* Stateid was found, this is an OPEN upgrade */
1793                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1794                 if (status)
1795                         goto out;
1796                 update_stateid(&stp->st_stateid);
1797         } else {
1798                 /* Stateid was not found, this is a new OPEN */
1799                 int flags = 0;
1800                 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1801                         flags |= MAY_READ;
1802                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1803                         flags |= MAY_WRITE;
1804                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1805                 if (status)
1806                         goto out;
1807                 init_stateid(stp, fp, open);
1808                 status = nfsd4_truncate(rqstp, current_fh, open);
1809                 if (status) {
1810                         release_stateid(stp, OPEN_STATE);
1811                         goto out;
1812                 }
1813         }
1814         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1815
1816         /*
1817         * Attempt to hand out a delegation. No error return, because the
1818         * OPEN succeeds even if we fail.
1819         */
1820         nfs4_open_delegation(current_fh, open, stp);
1821
1822         status = nfs_ok;
1823
1824         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1825                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1826                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1827 out:
1828         if (fp)
1829                 put_nfs4_file(fp);
1830         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1831                 nfs4_set_claim_prev(open);
1832         /*
1833         * To finish the open response, we just need to set the rflags.
1834         */
1835         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1836         if (!open->op_stateowner->so_confirmed)
1837                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1838
1839         return status;
1840 }
1841
1842 static struct workqueue_struct *laundry_wq;
1843 static void laundromat_main(struct work_struct *);
1844 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1845
1846 __be32
1847 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1848             clientid_t *clid)
1849 {
1850         struct nfs4_client *clp;
1851         __be32 status;
1852
1853         nfs4_lock_state();
1854         dprintk("process_renew(%08x/%08x): starting\n",
1855                         clid->cl_boot, clid->cl_id);
1856         status = nfserr_stale_clientid;
1857         if (STALE_CLIENTID(clid))
1858                 goto out;
1859         clp = find_confirmed_client(clid);
1860         status = nfserr_expired;
1861         if (clp == NULL) {
1862                 /* We assume the client took too long to RENEW. */
1863                 dprintk("nfsd4_renew: clientid not found!\n");
1864                 goto out;
1865         }
1866         renew_client(clp);
1867         status = nfserr_cb_path_down;
1868         if (!list_empty(&clp->cl_delegations)
1869                         && !atomic_read(&clp->cl_callback.cb_set))
1870                 goto out;
1871         status = nfs_ok;
1872 out:
1873         nfs4_unlock_state();
1874         return status;
1875 }
1876
1877 static void
1878 end_grace(void)
1879 {
1880         dprintk("NFSD: end of grace period\n");
1881         nfsd4_recdir_purge_old();
1882         in_grace = 0;
1883 }
1884
1885 static time_t
1886 nfs4_laundromat(void)
1887 {
1888         struct nfs4_client *clp;
1889         struct nfs4_stateowner *sop;
1890         struct nfs4_delegation *dp;
1891         struct list_head *pos, *next, reaplist;
1892         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1893         time_t t, clientid_val = NFSD_LEASE_TIME;
1894         time_t u, test_val = NFSD_LEASE_TIME;
1895
1896         nfs4_lock_state();
1897
1898         dprintk("NFSD: laundromat service - starting\n");
1899         if (in_grace)
1900                 end_grace();
1901         list_for_each_safe(pos, next, &client_lru) {
1902                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1903                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1904                         t = clp->cl_time - cutoff;
1905                         if (clientid_val > t)
1906                                 clientid_val = t;
1907                         break;
1908                 }
1909                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1910                         clp->cl_clientid.cl_id);
1911                 nfsd4_remove_clid_dir(clp);
1912                 expire_client(clp);
1913         }
1914         INIT_LIST_HEAD(&reaplist);
1915         spin_lock(&recall_lock);
1916         list_for_each_safe(pos, next, &del_recall_lru) {
1917                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1918                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1919                         u = dp->dl_time - cutoff;
1920                         if (test_val > u)
1921                                 test_val = u;
1922                         break;
1923                 }
1924                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1925                                     dp, dp->dl_flock);
1926                 list_move(&dp->dl_recall_lru, &reaplist);
1927         }
1928         spin_unlock(&recall_lock);
1929         list_for_each_safe(pos, next, &reaplist) {
1930                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1931                 list_del_init(&dp->dl_recall_lru);
1932                 unhash_delegation(dp);
1933         }
1934         test_val = NFSD_LEASE_TIME;
1935         list_for_each_safe(pos, next, &close_lru) {
1936                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1937                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1938                         u = sop->so_time - cutoff;
1939                         if (test_val > u)
1940                                 test_val = u;
1941                         break;
1942                 }
1943                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1944                         sop->so_id);
1945                 release_stateowner(sop);
1946         }
1947         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1948                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1949         nfs4_unlock_state();
1950         return clientid_val;
1951 }
1952
1953 void
1954 laundromat_main(struct work_struct *not_used)
1955 {
1956         time_t t;
1957
1958         t = nfs4_laundromat();
1959         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1960         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1961 }
1962
1963 static struct nfs4_stateowner *
1964 search_close_lru(u32 st_id, int flags)
1965 {
1966         struct nfs4_stateowner *local = NULL;
1967
1968         if (flags & CLOSE_STATE) {
1969                 list_for_each_entry(local, &close_lru, so_close_lru) {
1970                         if (local->so_id == st_id)
1971                                 return local;
1972                 }
1973         }
1974         return NULL;
1975 }
1976
1977 static inline int
1978 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1979 {
1980         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1981 }
1982
1983 static int
1984 STALE_STATEID(stateid_t *stateid)
1985 {
1986         if (stateid->si_boot == boot_time)
1987                 return 0;
1988         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1989                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1990                 stateid->si_generation);
1991         return 1;
1992 }
1993
1994 static inline int
1995 access_permit_read(unsigned long access_bmap)
1996 {
1997         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1998                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1999                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2000 }
2001
2002 static inline int
2003 access_permit_write(unsigned long access_bmap)
2004 {
2005         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2006                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2007 }
2008
2009 static
2010 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2011 {
2012         __be32 status = nfserr_openmode;
2013
2014         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2015                 goto out;
2016         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2017                 goto out;
2018         status = nfs_ok;
2019 out:
2020         return status;
2021 }
2022
2023 static inline __be32
2024 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2025 {
2026         /* Trying to call delegreturn with a special stateid? Yuch: */
2027         if (!(flags & (RD_STATE | WR_STATE)))
2028                 return nfserr_bad_stateid;
2029         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2030                 return nfs_ok;
2031         else if (nfs4_in_grace()) {
2032                 /* Answer in remaining cases depends on existance of
2033                  * conflicting state; so we must wait out the grace period. */
2034                 return nfserr_grace;
2035         } else if (flags & WR_STATE)
2036                 return nfs4_share_conflict(current_fh,
2037                                 NFS4_SHARE_DENY_WRITE);
2038         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2039                 return nfs4_share_conflict(current_fh,
2040                                 NFS4_SHARE_DENY_READ);
2041 }
2042
2043 /*
2044  * Allow READ/WRITE during grace period on recovered state only for files
2045  * that are not able to provide mandatory locking.
2046  */
2047 static inline int
2048 io_during_grace_disallowed(struct inode *inode, int flags)
2049 {
2050         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2051                 && MANDATORY_LOCK(inode);
2052 }
2053
2054 /*
2055 * Checks for stateid operations
2056 */
2057 __be32
2058 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2059 {
2060         struct nfs4_stateid *stp = NULL;
2061         struct nfs4_delegation *dp = NULL;
2062         stateid_t *stidp;
2063         struct inode *ino = current_fh->fh_dentry->d_inode;
2064         __be32 status;
2065
2066         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2067                 stateid->si_boot, stateid->si_stateownerid,
2068                 stateid->si_fileid, stateid->si_generation);
2069         if (filpp)
2070                 *filpp = NULL;
2071
2072         if (io_during_grace_disallowed(ino, flags))
2073                 return nfserr_grace;
2074
2075         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2076                 return check_special_stateids(current_fh, stateid, flags);
2077
2078         /* STALE STATEID */
2079         status = nfserr_stale_stateid;
2080         if (STALE_STATEID(stateid))
2081                 goto out;
2082
2083         /* BAD STATEID */
2084         status = nfserr_bad_stateid;
2085         if (!stateid->si_fileid) { /* delegation stateid */
2086                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2087                         dprintk("NFSD: delegation stateid not found\n");
2088                         goto out;
2089                 }
2090                 stidp = &dp->dl_stateid;
2091         } else { /* open or lock stateid */
2092                 if (!(stp = find_stateid(stateid, flags))) {
2093                         dprintk("NFSD: open or lock stateid not found\n");
2094                         goto out;
2095                 }
2096                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2097                         goto out;
2098                 if (!stp->st_stateowner->so_confirmed)
2099                         goto out;
2100                 stidp = &stp->st_stateid;
2101         }
2102         if (stateid->si_generation > stidp->si_generation)
2103                 goto out;
2104
2105         /* OLD STATEID */
2106         status = nfserr_old_stateid;
2107         if (stateid->si_generation < stidp->si_generation)
2108                 goto out;
2109         if (stp) {
2110                 if ((status = nfs4_check_openmode(stp,flags)))
2111                         goto out;
2112                 renew_client(stp->st_stateowner->so_client);
2113                 if (filpp)
2114                         *filpp = stp->st_vfs_file;
2115         } else if (dp) {
2116                 if ((status = nfs4_check_delegmode(dp, flags)))
2117                         goto out;
2118                 renew_client(dp->dl_client);
2119                 if (flags & DELEG_RET)
2120                         unhash_delegation(dp);
2121                 if (filpp)
2122                         *filpp = dp->dl_vfs_file;
2123         }
2124         status = nfs_ok;
2125 out:
2126         return status;
2127 }
2128
2129 static inline int
2130 setlkflg (int type)
2131 {
2132         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2133                 RD_STATE : WR_STATE;
2134 }
2135
2136 /*
2137  * Checks for sequence id mutating operations.
2138  */
2139 static __be32
2140 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
2141 {
2142         struct nfs4_stateid *stp;
2143         struct nfs4_stateowner *sop;
2144
2145         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2146                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2147                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2148                 stateid->si_generation);
2149
2150         *stpp = NULL;
2151         *sopp = NULL;
2152
2153         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2154                 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2155                 return nfserr_bad_stateid;
2156         }
2157
2158         if (STALE_STATEID(stateid))
2159                 return nfserr_stale_stateid;
2160         /*
2161         * We return BAD_STATEID if filehandle doesn't match stateid,
2162         * the confirmed flag is incorrecly set, or the generation
2163         * number is incorrect.
2164         */
2165         stp = find_stateid(stateid, flags);
2166         if (stp == NULL) {
2167                 /*
2168                  * Also, we should make sure this isn't just the result of
2169                  * a replayed close:
2170                  */
2171                 sop = search_close_lru(stateid->si_stateownerid, flags);
2172                 if (sop == NULL)
2173                         return nfserr_bad_stateid;
2174                 *sopp = sop;
2175                 goto check_replay;
2176         }
2177
2178         if (lock) {
2179                 struct nfs4_stateowner *sop = stp->st_stateowner;
2180                 clientid_t *lockclid = &lock->v.new.clientid;
2181                 struct nfs4_client *clp = sop->so_client;
2182                 int lkflg = 0;
2183                 __be32 status;
2184
2185                 lkflg = setlkflg(lock->lk_type);
2186
2187                 if (lock->lk_is_new) {
2188                         if (!sop->so_is_open_owner)
2189                                 return nfserr_bad_stateid;
2190                         if (!same_clid(&clp->cl_clientid, lockclid))
2191                                return nfserr_bad_stateid;
2192                         /* stp is the open stateid */
2193                         status = nfs4_check_openmode(stp, lkflg);
2194                         if (status)
2195                                 return status;
2196                 } else {
2197                         /* stp is the lock stateid */
2198                         status = nfs4_check_openmode(stp->st_openstp, lkflg);
2199                         if (status)
2200                                 return status;
2201                }
2202         }
2203
2204         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2205                 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2206                 return nfserr_bad_stateid;
2207         }
2208
2209         *stpp = stp;
2210         *sopp = sop = stp->st_stateowner;
2211
2212         /*
2213         *  We now validate the seqid and stateid generation numbers.
2214         *  For the moment, we ignore the possibility of
2215         *  generation number wraparound.
2216         */
2217         if (seqid != sop->so_seqid)
2218                 goto check_replay;
2219
2220         if (sop->so_confirmed && flags & CONFIRM) {
2221                 dprintk("NFSD: preprocess_seqid_op: expected"
2222                                 " unconfirmed stateowner!\n");
2223                 return nfserr_bad_stateid;
2224         }
2225         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2226                 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2227                                 " confirmed yet!\n");
2228                 return nfserr_bad_stateid;
2229         }
2230         if (stateid->si_generation > stp->st_stateid.si_generation) {
2231                 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
2232                 return nfserr_bad_stateid;
2233         }
2234
2235         if (stateid->si_generation < stp->st_stateid.si_generation) {
2236                 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
2237                 return nfserr_old_stateid;
2238         }
2239         renew_client(sop->so_client);
2240         return nfs_ok;
2241
2242 check_replay:
2243         if (seqid == sop->so_seqid - 1) {
2244                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2245                 /* indicate replay to calling function */
2246                 return nfserr_replay_me;
2247         }
2248         dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2249                         sop->so_seqid, seqid);
2250         *sopp = NULL;
2251         return nfserr_bad_seqid;
2252 }
2253
2254 __be32
2255 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2256                    struct nfsd4_open_confirm *oc)
2257 {
2258         __be32 status;
2259         struct nfs4_stateowner *sop;
2260         struct nfs4_stateid *stp;
2261
2262         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2263                         (int)cstate->current_fh.fh_dentry->d_name.len,
2264                         cstate->current_fh.fh_dentry->d_name.name);
2265
2266         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2267         if (status)
2268                 return status;
2269
2270         nfs4_lock_state();
2271
2272         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2273                                         oc->oc_seqid, &oc->oc_req_stateid,
2274                                         CHECK_FH | CONFIRM | OPEN_STATE,
2275                                         &oc->oc_stateowner, &stp, NULL)))
2276                 goto out;
2277
2278         sop = oc->oc_stateowner;
2279         sop->so_confirmed = 1;
2280         update_stateid(&stp->st_stateid);
2281         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2282         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2283                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2284                          stp->st_stateid.si_boot,
2285                          stp->st_stateid.si_stateownerid,
2286                          stp->st_stateid.si_fileid,
2287                          stp->st_stateid.si_generation);
2288
2289         nfsd4_create_clid_dir(sop->so_client);
2290 out:
2291         if (oc->oc_stateowner) {
2292                 nfs4_get_stateowner(oc->oc_stateowner);
2293                 cstate->replay_owner = oc->oc_stateowner;
2294         }
2295         nfs4_unlock_state();
2296         return status;
2297 }
2298
2299
2300 /*
2301  * unset all bits in union bitmap (bmap) that
2302  * do not exist in share (from successful OPEN_DOWNGRADE)
2303  */
2304 static void
2305 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2306 {
2307         int i;
2308         for (i = 1; i < 4; i++) {
2309                 if ((i & access) != i)
2310                         __clear_bit(i, bmap);
2311         }
2312 }
2313
2314 static void
2315 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2316 {
2317         int i;
2318         for (i = 0; i < 4; i++) {
2319                 if ((i & deny) != i)
2320                         __clear_bit(i, bmap);
2321         }
2322 }
2323
2324 __be32
2325 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2326                      struct nfsd4_compound_state *cstate,
2327                      struct nfsd4_open_downgrade *od)
2328 {
2329         __be32 status;
2330         struct nfs4_stateid *stp;
2331         unsigned int share_access;
2332
2333         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2334                         (int)cstate->current_fh.fh_dentry->d_name.len,
2335                         cstate->current_fh.fh_dentry->d_name.name);
2336
2337         if (!access_valid(od->od_share_access)
2338                         || !deny_valid(od->od_share_deny))
2339                 return nfserr_inval;
2340
2341         nfs4_lock_state();
2342         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2343                                         od->od_seqid,
2344                                         &od->od_stateid,
2345                                         CHECK_FH | OPEN_STATE,
2346                                         &od->od_stateowner, &stp, NULL)))
2347                 goto out;
2348
2349         status = nfserr_inval;
2350         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2351                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2352                         stp->st_access_bmap, od->od_share_access);
2353                 goto out;
2354         }
2355         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2356                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2357                         stp->st_deny_bmap, od->od_share_deny);
2358                 goto out;
2359         }
2360         set_access(&share_access, stp->st_access_bmap);
2361         nfs4_file_downgrade(stp->st_vfs_file,
2362                             share_access & ~od->od_share_access);
2363
2364         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2365         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2366
2367         update_stateid(&stp->st_stateid);
2368         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2369         status = nfs_ok;
2370 out:
2371         if (od->od_stateowner) {
2372                 nfs4_get_stateowner(od->od_stateowner);
2373                 cstate->replay_owner = od->od_stateowner;
2374         }
2375         nfs4_unlock_state();
2376         return status;
2377 }
2378
2379 /*
2380  * nfs4_unlock_state() called after encode
2381  */
2382 __be32
2383 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2384             struct nfsd4_close *close)
2385 {
2386         __be32 status;
2387         struct nfs4_stateid *stp;
2388
2389         dprintk("NFSD: nfsd4_close on file %.*s\n",
2390                         (int)cstate->current_fh.fh_dentry->d_name.len,
2391                         cstate->current_fh.fh_dentry->d_name.name);
2392
2393         nfs4_lock_state();
2394         /* check close_lru for replay */
2395         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2396                                         close->cl_seqid,
2397                                         &close->cl_stateid,
2398                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2399                                         &close->cl_stateowner, &stp, NULL)))
2400                 goto out;
2401         status = nfs_ok;
2402         update_stateid(&stp->st_stateid);
2403         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2404
2405         /* release_stateid() calls nfsd_close() if needed */
2406         release_stateid(stp, OPEN_STATE);
2407
2408         /* place unused nfs4_stateowners on so_close_lru list to be
2409          * released by the laundromat service after the lease period
2410          * to enable us to handle CLOSE replay
2411          */
2412         if (list_empty(&close->cl_stateowner->so_stateids))
2413                 move_to_close_lru(close->cl_stateowner);
2414 out:
2415         if (close->cl_stateowner) {
2416                 nfs4_get_stateowner(close->cl_stateowner);
2417                 cstate->replay_owner = close->cl_stateowner;
2418         }
2419         nfs4_unlock_state();
2420         return status;
2421 }
2422
2423 __be32
2424 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2425                   struct nfsd4_delegreturn *dr)
2426 {
2427         __be32 status;
2428
2429         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2430                 goto out;
2431
2432         nfs4_lock_state();
2433         status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2434                                             &dr->dr_stateid, DELEG_RET, NULL);
2435         nfs4_unlock_state();
2436 out:
2437         return status;
2438 }
2439
2440
2441 /*
2442  * Lock owner state (byte-range locks)
2443  */
2444 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2445 #define LOCK_HASH_BITS              8
2446 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2447 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2448
2449 #define lockownerid_hashval(id) \
2450         ((id) & LOCK_HASH_MASK)
2451
2452 static inline unsigned int
2453 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2454                 struct xdr_netobj *ownername)
2455 {
2456         return (file_hashval(inode) + cl_id
2457                         + opaque_hashval(ownername->data, ownername->len))
2458                 & LOCK_HASH_MASK;
2459 }
2460
2461 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2462 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2463 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2464
2465 static struct nfs4_stateid *
2466 find_stateid(stateid_t *stid, int flags)
2467 {
2468         struct nfs4_stateid *local = NULL;
2469         u32 st_id = stid->si_stateownerid;
2470         u32 f_id = stid->si_fileid;
2471         unsigned int hashval;
2472
2473         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2474         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2475                 hashval = stateid_hashval(st_id, f_id);
2476                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2477                         if ((local->st_stateid.si_stateownerid == st_id) &&
2478                             (local->st_stateid.si_fileid == f_id))
2479                                 return local;
2480                 }
2481         }
2482         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2483                 hashval = stateid_hashval(st_id, f_id);
2484                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2485                         if ((local->st_stateid.si_stateownerid == st_id) &&
2486                             (local->st_stateid.si_fileid == f_id))
2487                                 return local;
2488                 }
2489         }
2490         return NULL;
2491 }
2492
2493 static struct nfs4_delegation *
2494 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2495 {
2496         struct nfs4_file *fp;
2497         struct nfs4_delegation *dl;
2498
2499         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2500                     stid->si_boot, stid->si_stateownerid,
2501                     stid->si_fileid, stid->si_generation);
2502
2503         fp = find_file(ino);
2504         if (!fp)
2505                 return NULL;
2506         dl = find_delegation_file(fp, stid);
2507         put_nfs4_file(fp);
2508         return dl;
2509 }
2510
2511 /*
2512  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2513  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2514  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2515  * locking, this prevents us from being completely protocol-compliant.  The
2516  * real solution to this problem is to start using unsigned file offsets in
2517  * the VFS, but this is a very deep change!
2518  */
2519 static inline void
2520 nfs4_transform_lock_offset(struct file_lock *lock)
2521 {
2522         if (lock->fl_start < 0)
2523                 lock->fl_start = OFFSET_MAX;
2524         if (lock->fl_end < 0)
2525                 lock->fl_end = OFFSET_MAX;
2526 }
2527
2528 /* Hack!: For now, we're defining this just so we can use a pointer to it
2529  * as a unique cookie to identify our (NFSv4's) posix locks. */
2530 static struct lock_manager_operations nfsd_posix_mng_ops  = {
2531 };
2532
2533 static inline void
2534 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2535 {
2536         struct nfs4_stateowner *sop;
2537         unsigned int hval;
2538
2539         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2540                 sop = (struct nfs4_stateowner *) fl->fl_owner;
2541                 hval = lockownerid_hashval(sop->so_id);
2542                 kref_get(&sop->so_ref);
2543                 deny->ld_sop = sop;
2544                 deny->ld_clientid = sop->so_client->cl_clientid;
2545         } else {
2546                 deny->ld_sop = NULL;
2547                 deny->ld_clientid.cl_boot = 0;
2548                 deny->ld_clientid.cl_id = 0;
2549         }
2550         deny->ld_start = fl->fl_start;
2551         deny->ld_length = ~(u64)0;
2552         if (fl->fl_end != ~(u64)0)
2553                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2554         deny->ld_type = NFS4_READ_LT;
2555         if (fl->fl_type != F_RDLCK)
2556                 deny->ld_type = NFS4_WRITE_LT;
2557 }
2558
2559 static struct nfs4_stateowner *
2560 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2561                 struct xdr_netobj *owner)
2562 {
2563         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2564         struct nfs4_stateowner *op;
2565
2566         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2567                 if (same_owner_str(op, owner, clid))
2568                         return op;
2569         }
2570         return NULL;
2571 }
2572
2573 /*
2574  * Alloc a lock owner structure.
2575  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2576  * occured.
2577  *
2578  * strhashval = lock_ownerstr_hashval
2579  */
2580
2581 static struct nfs4_stateowner *
2582 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2583         struct nfs4_stateowner *sop;
2584         struct nfs4_replay *rp;
2585         unsigned int idhashval;
2586
2587         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2588                 return NULL;
2589         idhashval = lockownerid_hashval(current_ownerid);
2590         INIT_LIST_HEAD(&sop->so_idhash);
2591         INIT_LIST_HEAD(&sop->so_strhash);
2592         INIT_LIST_HEAD(&sop->so_perclient);
2593         INIT_LIST_HEAD(&sop->so_stateids);
2594         INIT_LIST_HEAD(&sop->so_perstateid);
2595         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2596         sop->so_time = 0;
2597         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2598         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2599         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2600         sop->so_is_open_owner = 0;
2601         sop->so_id = current_ownerid++;
2602         sop->so_client = clp;
2603         /* It is the openowner seqid that will be incremented in encode in the
2604          * case of new lockowners; so increment the lock seqid manually: */
2605         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2606         sop->so_confirmed = 1;
2607         rp = &sop->so_replay;
2608         rp->rp_status = nfserr_serverfault;
2609         rp->rp_buflen = 0;
2610         rp->rp_buf = rp->rp_ibuf;
2611         return sop;
2612 }
2613
2614 static struct nfs4_stateid *
2615 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2616 {
2617         struct nfs4_stateid *stp;
2618         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2619
2620         stp = nfs4_alloc_stateid();
2621         if (stp == NULL)
2622                 goto out;
2623         INIT_LIST_HEAD(&stp->st_hash);
2624         INIT_LIST_HEAD(&stp->st_perfile);
2625         INIT_LIST_HEAD(&stp->st_perstateowner);
2626         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2627         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2628         list_add(&stp->st_perfile, &fp->fi_stateids);
2629         list_add(&stp->st_perstateowner, &sop->so_stateids);
2630         stp->st_stateowner = sop;
2631         get_nfs4_file(fp);
2632         stp->st_file = fp;
2633         stp->st_stateid.si_boot = boot_time;
2634         stp->st_stateid.si_stateownerid = sop->so_id;
2635         stp->st_stateid.si_fileid = fp->fi_id;
2636         stp->st_stateid.si_generation = 0;
2637         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2638         stp->st_access_bmap = open_stp->st_access_bmap;
2639         stp->st_deny_bmap = open_stp->st_deny_bmap;
2640         stp->st_openstp = open_stp;
2641
2642 out:
2643         return stp;
2644 }
2645
2646 static int
2647 check_lock_length(u64 offset, u64 length)
2648 {
2649         return ((length == 0)  || ((length != ~(u64)0) &&
2650              LOFF_OVERFLOW(offset, length)));
2651 }
2652
2653 /*
2654  *  LOCK operation
2655  */
2656 __be32
2657 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2658            struct nfsd4_lock *lock)
2659 {
2660         struct nfs4_stateowner *open_sop = NULL;
2661         struct nfs4_stateowner *lock_sop = NULL;
2662         struct nfs4_stateid *lock_stp;
2663         struct file *filp;
2664         struct file_lock file_lock;
2665         struct file_lock conflock;
2666         __be32 status = 0;
2667         unsigned int strhashval;
2668         unsigned int cmd;
2669         int err;
2670
2671         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2672                 (long long) lock->lk_offset,
2673                 (long long) lock->lk_length);
2674
2675         if (check_lock_length(lock->lk_offset, lock->lk_length))
2676                  return nfserr_inval;
2677
2678         if ((status = fh_verify(rqstp, &cstate->current_fh,
2679                                 S_IFREG, MAY_LOCK))) {
2680                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2681                 return status;
2682         }
2683
2684         nfs4_lock_state();
2685
2686         if (lock->lk_is_new) {
2687                 /*
2688                  * Client indicates that this is a new lockowner.
2689                  * Use open owner and open stateid to create lock owner and
2690                  * lock stateid.
2691                  */
2692                 struct nfs4_stateid *open_stp = NULL;
2693                 struct nfs4_file *fp;
2694
2695                 status = nfserr_stale_clientid;
2696                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2697                         goto out;
2698
2699                 /* validate and update open stateid and open seqid */
2700                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2701                                         lock->lk_new_open_seqid,
2702                                         &lock->lk_new_open_stateid,
2703                                         CHECK_FH | OPEN_STATE,
2704                                         &lock->lk_replay_owner, &open_stp,
2705                                         lock);
2706                 if (status)
2707                         goto out;
2708                 open_sop = lock->lk_replay_owner;
2709                 /* create lockowner and lock stateid */
2710                 fp = open_stp->st_file;
2711                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2712                                 open_sop->so_client->cl_clientid.cl_id,
2713                                 &lock->v.new.owner);
2714                 /* XXX: Do we need to check for duplicate stateowners on
2715                  * the same file, or should they just be allowed (and
2716                  * create new stateids)? */
2717                 status = nfserr_resource;
2718                 lock_sop = alloc_init_lock_stateowner(strhashval,
2719                                 open_sop->so_client, open_stp, lock);
2720                 if (lock_sop == NULL)
2721                         goto out;
2722                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2723                 if (lock_stp == NULL)
2724                         goto out;
2725         } else {
2726                 /* lock (lock owner + lock stateid) already exists */
2727                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2728                                        lock->lk_old_lock_seqid,
2729                                        &lock->lk_old_lock_stateid,
2730                                        CHECK_FH | LOCK_STATE,
2731                                        &lock->lk_replay_owner, &lock_stp, lock);
2732                 if (status)
2733                         goto out;
2734                 lock_sop = lock->lk_replay_owner;
2735         }
2736         /* lock->lk_replay_owner and lock_stp have been created or found */
2737         filp = lock_stp->st_vfs_file;
2738
2739         status = nfserr_grace;
2740         if (nfs4_in_grace() && !lock->lk_reclaim)
2741                 goto out;
2742         status = nfserr_no_grace;
2743         if (!nfs4_in_grace() && lock->lk_reclaim)
2744                 goto out;
2745
2746         locks_init_lock(&file_lock);
2747         switch (lock->lk_type) {
2748                 case NFS4_READ_LT:
2749                 case NFS4_READW_LT:
2750                         file_lock.fl_type = F_RDLCK;
2751                         cmd = F_SETLK;
2752                 break;
2753                 case NFS4_WRITE_LT:
2754                 case NFS4_WRITEW_LT:
2755                         file_lock.fl_type = F_WRLCK;
2756                         cmd = F_SETLK;
2757                 break;
2758                 default:
2759                         status = nfserr_inval;
2760                 goto out;
2761         }
2762         file_lock.fl_owner = (fl_owner_t)lock_sop;
2763         file_lock.fl_pid = current->tgid;
2764         file_lock.fl_file = filp;
2765         file_lock.fl_flags = FL_POSIX;
2766         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2767
2768         file_lock.fl_start = lock->lk_offset;
2769         if ((lock->lk_length == ~(u64)0) ||
2770                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2771                 file_lock.fl_end = ~(u64)0;
2772         else
2773                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2774         nfs4_transform_lock_offset(&file_lock);
2775
2776         /*
2777         * Try to lock the file in the VFS.
2778         * Note: locks.c uses the BKL to protect the inode's lock list.
2779         */
2780
2781         /* XXX?: Just to divert the locks_release_private at the start of
2782          * locks_copy_lock: */
2783         locks_init_lock(&conflock);
2784         err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2785         switch (-err) {
2786         case 0: /* success! */
2787                 update_stateid(&lock_stp->st_stateid);
2788                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2789                                 sizeof(stateid_t));
2790                 status = 0;
2791                 break;
2792         case (EAGAIN):          /* conflock holds conflicting lock */
2793                 status = nfserr_denied;
2794                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2795                 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2796                 break;
2797         case (EDEADLK):
2798                 status = nfserr_deadlock;
2799                 break;
2800         default:
2801                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2802                 status = nfserr_resource;
2803                 break;
2804         }
2805 out:
2806         if (status && lock->lk_is_new && lock_sop)
2807                 release_stateowner(lock_sop);
2808         if (lock->lk_replay_owner) {
2809                 nfs4_get_stateowner(lock->lk_replay_owner);
2810                 cstate->replay_owner = lock->lk_replay_owner;
2811         }
2812         nfs4_unlock_state();
2813         return status;
2814 }
2815
2816 /*
2817  * LOCKT operation
2818  */
2819 __be32
2820 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2821             struct nfsd4_lockt *lockt)
2822 {
2823         struct inode *inode;
2824         struct file file;
2825         struct file_lock file_lock;
2826         int error;
2827         __be32 status;
2828
2829         if (nfs4_in_grace())
2830                 return nfserr_grace;
2831
2832         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2833                  return nfserr_inval;
2834
2835         lockt->lt_stateowner = NULL;
2836         nfs4_lock_state();
2837
2838         status = nfserr_stale_clientid;
2839         if (STALE_CLIENTID(&lockt->lt_clientid))
2840                 goto out;
2841
2842         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2843                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2844                 if (status == nfserr_symlink)
2845                         status = nfserr_inval;
2846                 goto out;
2847         }
2848
2849         inode = cstate->current_fh.fh_dentry->d_inode;
2850         locks_init_lock(&file_lock);
2851         switch (lockt->lt_type) {
2852                 case NFS4_READ_LT:
2853                 case NFS4_READW_LT:
2854                         file_lock.fl_type = F_RDLCK;
2855                 break;
2856                 case NFS4_WRITE_LT:
2857                 case NFS4_WRITEW_LT:
2858                         file_lock.fl_type = F_WRLCK;
2859                 break;
2860                 default:
2861                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2862                         status = nfserr_inval;
2863                 goto out;
2864         }
2865
2866         lockt->lt_stateowner = find_lockstateowner_str(inode,
2867                         &lockt->lt_clientid, &lockt->lt_owner);
2868         if (lockt->lt_stateowner)
2869                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2870         file_lock.fl_pid = current->tgid;
2871         file_lock.fl_flags = FL_POSIX;
2872         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2873
2874         file_lock.fl_start = lockt->lt_offset;
2875         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2876                 file_lock.fl_end = ~(u64)0;
2877         else
2878                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2879
2880         nfs4_transform_lock_offset(&file_lock);
2881
2882         /* vfs_test_lock uses the struct file _only_ to resolve the inode.
2883          * since LOCKT doesn't require an OPEN, and therefore a struct
2884          * file may not exist, pass vfs_test_lock a struct file with
2885          * only the dentry:inode set.
2886          */
2887         memset(&file, 0, sizeof (struct file));
2888         file.f_path.dentry = cstate->current_fh.fh_dentry;
2889
2890         status = nfs_ok;
2891         error = vfs_test_lock(&file, &file_lock);
2892         if (error) {
2893                 status = nfserrno(error);
2894                 goto out;
2895         }
2896         if (file_lock.fl_type != F_UNLCK) {
2897                 status = nfserr_denied;
2898                 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2899         }
2900 out:
2901         nfs4_unlock_state();
2902         return status;
2903 }
2904
2905 __be32
2906 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2907             struct nfsd4_locku *locku)
2908 {
2909         struct nfs4_stateid *stp;
2910         struct file *filp = NULL;
2911         struct file_lock file_lock;
2912         __be32 status;
2913         int err;
2914
2915         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2916                 (long long) locku->lu_offset,
2917                 (long long) locku->lu_length);
2918
2919         if (check_lock_length(locku->lu_offset, locku->lu_length))
2920                  return nfserr_inval;
2921
2922         nfs4_lock_state();
2923
2924         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2925                                         locku->lu_seqid,
2926                                         &locku->lu_stateid,
2927                                         CHECK_FH | LOCK_STATE,
2928                                         &locku->lu_stateowner, &stp, NULL)))
2929                 goto out;
2930
2931         filp = stp->st_vfs_file;
2932         BUG_ON(!filp);
2933         locks_init_lock(&file_lock);
2934         file_lock.fl_type = F_UNLCK;
2935         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2936         file_lock.fl_pid = current->tgid;
2937         file_lock.fl_file = filp;
2938         file_lock.fl_flags = FL_POSIX;
2939         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2940         file_lock.fl_start = locku->lu_offset;
2941
2942         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2943                 file_lock.fl_end = ~(u64)0;
2944         else
2945                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2946         nfs4_transform_lock_offset(&file_lock);
2947
2948         /*
2949         *  Try to unlock the file in the VFS.
2950         */
2951         err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2952         if (err) {
2953                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2954                 goto out_nfserr;
2955         }
2956         /*
2957         * OK, unlock succeeded; the only thing left to do is update the stateid.
2958         */
2959         update_stateid(&stp->st_stateid);
2960         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2961
2962 out:
2963         if (locku->lu_stateowner) {
2964                 nfs4_get_stateowner(locku->lu_stateowner);
2965                 cstate->replay_owner = locku->lu_stateowner;
2966         }
2967         nfs4_unlock_state();
2968         return status;
2969
2970 out_nfserr:
2971         status = nfserrno(err);
2972         goto out;
2973 }
2974
2975 /*
2976  * returns
2977  *      1: locks held by lockowner
2978  *      0: no locks held by lockowner
2979  */
2980 static int
2981 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2982 {
2983         struct file_lock **flpp;
2984         struct inode *inode = filp->f_path.dentry->d_inode;
2985         int status = 0;
2986
2987         lock_kernel();
2988         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2989                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2990                         status = 1;
2991                         goto out;
2992                 }
2993         }
2994 out:
2995         unlock_kernel();
2996         return status;
2997 }
2998
2999 __be32
3000 nfsd4_release_lockowner(struct svc_rqst *rqstp,
3001                         struct nfsd4_compound_state *cstate,
3002                         struct nfsd4_release_lockowner *rlockowner)
3003 {
3004         clientid_t *clid = &rlockowner->rl_clientid;
3005         struct nfs4_stateowner *sop;
3006         struct nfs4_stateid *stp;
3007         struct xdr_netobj *owner = &rlockowner->rl_owner;
3008         struct list_head matches;
3009         int i;
3010         __be32 status;
3011
3012         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3013                 clid->cl_boot, clid->cl_id);
3014
3015         /* XXX check for lease expiration */
3016
3017         status = nfserr_stale_clientid;
3018         if (STALE_CLIENTID(clid))
3019                 return status;
3020
3021         nfs4_lock_state();
3022
3023         status = nfserr_locks_held;
3024         /* XXX: we're doing a linear search through all the lockowners.
3025          * Yipes!  For now we'll just hope clients aren't really using
3026          * release_lockowner much, but eventually we have to fix these
3027          * data structures. */
3028         INIT_LIST_HEAD(&matches);
3029         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3030                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3031                         if (!same_owner_str(sop, owner, clid))
3032                                 continue;
3033                         list_for_each_entry(stp, &sop->so_stateids,
3034                                         st_perstateowner) {
3035                                 if (check_for_locks(stp->st_vfs_file, sop))
3036                                         goto out;
3037                                 /* Note: so_perclient unused for lockowners,
3038                                  * so it's OK to fool with here. */
3039                                 list_add(&sop->so_perclient, &matches);
3040                         }
3041                 }
3042         }
3043         /* Clients probably won't expect us to return with some (but not all)
3044          * of the lockowner state released; so don't release any until all
3045          * have been checked. */
3046         status = nfs_ok;
3047         while (!list_empty(&matches)) {
3048                 sop = list_entry(matches.next, struct nfs4_stateowner,
3049                                                                 so_perclient);
3050                 /* unhash_stateowner deletes so_perclient only
3051                  * for openowners. */
3052                 list_del(&sop->so_perclient);
3053                 release_stateowner(sop);
3054         }
3055 out:
3056         nfs4_unlock_state();
3057         return status;
3058 }
3059
3060 static inline struct nfs4_client_reclaim *
3061 alloc_reclaim(void)
3062 {
3063         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3064 }
3065
3066 int
3067 nfs4_has_reclaimed_state(const char *name)
3068 {
3069         unsigned int strhashval = clientstr_hashval(name);
3070         struct nfs4_client *clp;
3071
3072         clp = find_confirmed_client_by_str(name, strhashval);
3073         return clp ? 1 : 0;
3074 }
3075
3076 /*
3077  * failure => all reset bets are off, nfserr_no_grace...
3078  */
3079 int
3080 nfs4_client_to_reclaim(const char *name)
3081 {
3082         unsigned int strhashval;
3083         struct nfs4_client_reclaim *crp = NULL;
3084
3085         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3086         crp = alloc_reclaim();
3087         if (!crp)
3088                 return 0;
3089         strhashval = clientstr_hashval(name);
3090         INIT_LIST_HEAD(&crp->cr_strhash);
3091         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3092         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3093         reclaim_str_hashtbl_size++;
3094         return 1;
3095 }
3096
3097 static void
3098 nfs4_release_reclaim(void)
3099 {
3100         struct nfs4_client_reclaim *crp = NULL;
3101         int i;
3102
3103         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3104                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3105                         crp = list_entry(reclaim_str_hashtbl[i].next,
3106                                         struct nfs4_client_reclaim, cr_strhash);
3107                         list_del(&crp->cr_strhash);
3108                         kfree(crp);
3109                         reclaim_str_hashtbl_size--;
3110                 }
3111         }
3112         BUG_ON(reclaim_str_hashtbl_size);
3113 }
3114
3115 /*
3116  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3117 static struct nfs4_client_reclaim *
3118 nfs4_find_reclaim_client(clientid_t *clid)
3119 {
3120         unsigned int strhashval;
3121         struct nfs4_client *clp;
3122         struct nfs4_client_reclaim *crp = NULL;
3123
3124
3125         /* find clientid in conf_id_hashtbl */
3126         clp = find_confirmed_client(clid);
3127         if (clp == NULL)
3128                 return NULL;
3129
3130         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3131                             clp->cl_name.len, clp->cl_name.data,
3132                             clp->cl_recdir);
3133
3134         /* find clp->cl_name in reclaim_str_hashtbl */
3135         strhashval = clientstr_hashval(clp->cl_recdir);
3136         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3137                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3138                         return crp;
3139                 }
3140         }
3141         return NULL;
3142 }
3143
3144 /*
3145 * Called from OPEN. Look for clientid in reclaim list.
3146 */
3147 __be32
3148 nfs4_check_open_reclaim(clientid_t *clid)
3149 {
3150         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3151 }
3152
3153 /* initialization to perform at module load time: */
3154
3155 void
3156 nfs4_state_init(void)
3157 {
3158         int i;
3159
3160         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3161                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3162                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3163                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3164                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3165         }
3166         for (i = 0; i < FILE_HASH_SIZE; i++) {
3167                 INIT_LIST_HEAD(&file_hashtbl[i]);
3168         }
3169         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3170                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3171                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3172         }
3173         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3174                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3175                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3176         }
3177         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3178                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3179                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3180         }
3181         memset(&onestateid, ~0, sizeof(stateid_t));
3182         INIT_LIST_HEAD(&close_lru);
3183         INIT_LIST_HEAD(&client_lru);
3184         INIT_LIST_HEAD(&del_recall_lru);
3185         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3186                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3187         reclaim_str_hashtbl_size = 0;
3188 }
3189
3190 static void
3191 nfsd4_load_reboot_recovery_data(void)
3192 {
3193         int status;
3194
3195         nfs4_lock_state();
3196         nfsd4_init_recdir(user_recovery_dirname);
3197         status = nfsd4_recdir_load();
3198         nfs4_unlock_state();
3199         if (status)
3200                 printk("NFSD: Failure reading reboot recovery data\n");
3201 }
3202
3203 unsigned long
3204 get_nfs4_grace_period(void)
3205 {
3206         return max(user_lease_time, lease_time) * HZ;
3207 }
3208
3209 /*
3210  * Since the lifetime of a delegation isn't limited to that of an open, a
3211  * client may quite reasonably hang on to a delegation as long as it has
3212  * the inode cached.  This becomes an obvious problem the first time a
3213  * client's inode cache approaches the size of the server's total memory.
3214  *
3215  * For now we avoid this problem by imposing a hard limit on the number
3216  * of delegations, which varies according to the server's memory size.
3217  */
3218 static void
3219 set_max_delegations(void)
3220 {
3221         /*
3222          * Allow at most 4 delegations per megabyte of RAM.  Quick
3223          * estimates suggest that in the worst case (where every delegation
3224          * is for a different inode), a delegation could take about 1.5K,
3225          * giving a worst case usage of about 6% of memory.
3226          */
3227         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3228 }
3229
3230 /* initialization to perform when the nfsd service is started: */
3231
3232 static void
3233 __nfs4_state_start(void)
3234 {
3235         unsigned long grace_time;
3236
3237         boot_time = get_seconds();
3238         grace_time = get_nfs_grace_period();
3239         lease_time = user_lease_time;
3240         in_grace = 1;
3241         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3242                grace_time/HZ);
3243         laundry_wq = create_singlethread_workqueue("nfsd4");
3244         queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3245         set_max_delegations();
3246 }
3247
3248 int
3249 nfs4_state_start(void)
3250 {
3251         int status;
3252
3253         if (nfs4_init)
3254                 return 0;
3255         status = nfsd4_init_slabs();
3256         if (status)
3257                 return status;
3258         nfsd4_load_reboot_recovery_data();
3259         __nfs4_state_start();
3260         nfs4_init = 1;
3261         return 0;
3262 }
3263
3264 int
3265 nfs4_in_grace(void)
3266 {
3267         return in_grace;
3268 }
3269
3270 time_t
3271 nfs4_lease_time(void)
3272 {
3273         return lease_time;
3274 }
3275
3276 static void
3277 __nfs4_state_shutdown(void)
3278 {
3279         int i;
3280         struct nfs4_client *clp = NULL;
3281         struct nfs4_delegation *dp = NULL;
3282         struct list_head *pos, *next, reaplist;
3283
3284         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3285                 while (!list_empty(&conf_id_hashtbl[i])) {
3286                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3287                         expire_client(clp);
3288                 }
3289                 while (!list_empty(&unconf_str_hashtbl[i])) {
3290                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3291                         expire_client(clp);
3292                 }
3293         }
3294         INIT_LIST_HEAD(&reaplist);
3295         spin_lock(&recall_lock);
3296         list_for_each_safe(pos, next, &del_recall_lru) {
3297                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3298                 list_move(&dp->dl_recall_lru, &reaplist);
3299         }
3300         spin_unlock(&recall_lock);
3301         list_for_each_safe(pos, next, &reaplist) {
3302                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3303                 list_del_init(&dp->dl_recall_lru);
3304                 unhash_delegation(dp);
3305         }
3306
3307         nfsd4_shutdown_recdir();
3308         nfs4_init = 0;
3309 }
3310
3311 void
3312 nfs4_state_shutdown(void)
3313 {
3314         cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3315         destroy_workqueue(laundry_wq);
3316         nfs4_lock_state();
3317         nfs4_release_reclaim();
3318         __nfs4_state_shutdown();
3319         nfsd4_free_slabs();
3320         nfs4_unlock_state();
3321 }
3322
3323 static void
3324 nfs4_set_recdir(char *recdir)
3325 {
3326         nfs4_lock_state();
3327         strcpy(user_recovery_dirname, recdir);
3328         nfs4_unlock_state();
3329 }
3330
3331 /*
3332  * Change the NFSv4 recovery directory to recdir.
3333  */
3334 int
3335 nfs4_reset_recoverydir(char *recdir)
3336 {
3337         int status;
3338         struct nameidata nd;
3339
3340         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3341         if (status)
3342                 return status;
3343         status = -ENOTDIR;
3344         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3345                 nfs4_set_recdir(recdir);
3346                 status = 0;
3347         }
3348         path_release(&nd);
3349         return status;
3350 }
3351
3352 /*
3353  * Called when leasetime is changed.
3354  *
3355  * The only way the protocol gives us to handle on-the-fly lease changes is to
3356  * simulate a reboot.  Instead of doing that, we just wait till the next time
3357  * we start to register any changes in lease time.  If the administrator
3358  * really wants to change the lease time *now*, they can go ahead and bring
3359  * nfsd down and then back up again after changing the lease time.
3360  */
3361 void
3362 nfs4_reset_lease(time_t leasetime)
3363 {
3364         lock_kernel();
3365         user_lease_time = leasetime;
3366         unlock_kernel();
3367 }