git.oblomov.eu Git - linux-2.6/blob - fs/nfsd/nfs4state.c

   1 /*
   2 *  linux/fs/nfsd/nfs4state.c
   3 *
   4 *  Copyright (c) 2001 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson <kandros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 */
  36
  37 #include <linux/param.h>
  38 #include <linux/major.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/sunrpc/svc.h>
  42 #include <linux/nfsd/nfsd.h>
  43 #include <linux/nfsd/cache.h>
  44 #include <linux/mount.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/kthread.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfsd/state.h>
  50 #include <linux/nfsd/xdr4.h>
  51 #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 void
 362 shutdown_callback_client(struct nfs4_client *clp)
 363 {
 364         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 365
 366         /* shutdown rpc client, ending any outstanding recall rpcs */
 367         if (clnt) {
 368                 clp->cl_callback.cb_client = NULL;
 369                 rpc_shutdown_client(clnt);
 370         }
 371 }
 372
 373 static inline void
 374 free_client(struct nfs4_client *clp)
 375 {
 376         shutdown_callback_client(clp);
 377         if (clp->cl_cred.cr_group_info)
 378                 put_group_info(clp->cl_cred.cr_group_info);
 379         kfree(clp->cl_name.data);
 380         kfree(clp);
 381 }
 382
 383 void
 384 put_nfs4_client(struct nfs4_client *clp)
 385 {
 386         if (atomic_dec_and_test(&clp->cl_count))
 387                 free_client(clp);
 388 }
 389
 390 static void
 391 expire_client(struct nfs4_client *clp)
 392 {
 393         struct nfs4_stateowner *sop;
 394         struct nfs4_delegation *dp;
 395         struct list_head reaplist;
 396
 397         dprintk("NFSD: expire_client cl_count %d\n",
 398                             atomic_read(&clp->cl_count));
 399
 400         INIT_LIST_HEAD(&reaplist);
 401         spin_lock(&recall_lock);
 402         while (!list_empty(&clp->cl_delegations)) {
 403                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
 404                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 405                                 dp->dl_flock);
 406                 list_del_init(&dp->dl_perclnt);
 407                 list_move(&dp->dl_recall_lru, &reaplist);
 408         }
 409         spin_unlock(&recall_lock);
 410         while (!list_empty(&reaplist)) {
 411                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 412                 list_del_init(&dp->dl_recall_lru);
 413                 unhash_delegation(dp);
 414         }
 415         list_del(&clp->cl_idhash);
 416         list_del(&clp->cl_strhash);
 417         list_del(&clp->cl_lru);
 418         while (!list_empty(&clp->cl_openowners)) {
 419                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
 420                 release_stateowner(sop);
 421         }
 422         put_nfs4_client(clp);
 423 }
 424
 425 static struct nfs4_client *
 426 create_client(struct xdr_netobj name, char *recdir) {
 427         struct nfs4_client *clp;
 428
 429         if (!(clp = alloc_client(name)))
 430                 goto out;
 431         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 432         atomic_set(&clp->cl_count, 1);
 433         atomic_set(&clp->cl_callback.cb_set, 0);
 434         INIT_LIST_HEAD(&clp->cl_idhash);
 435         INIT_LIST_HEAD(&clp->cl_strhash);
 436         INIT_LIST_HEAD(&clp->cl_openowners);
 437         INIT_LIST_HEAD(&clp->cl_delegations);
 438         INIT_LIST_HEAD(&clp->cl_lru);
 439 out:
 440         return clp;
 441 }
 442
 443 static void
 444 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 445         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 446 }
 447
 448 static void
 449 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 450         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 451         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 452 }
 453
 454 static void
 455 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 456
 457         target->cr_uid = source->cr_uid;
 458         target->cr_gid = source->cr_gid;
 459         target->cr_group_info = source->cr_group_info;
 460         get_group_info(target->cr_group_info);
 461 }
 462
 463 static inline int
 464 same_name(const char *n1, const char *n2)
 465 {
 466         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 467 }
 468
 469 static int
 470 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
 471 {
 472         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
 473 }
 474
 475 static int
 476 same_clid(clientid_t *cl1, clientid_t *cl2)
 477 {
 478         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
 479 }
 480
 481 /* XXX what about NGROUP */
 482 static int
 483 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
 484 {
 485         return cr1->cr_uid == cr2->cr_uid;
 486 }
 487
 488 static void
 489 gen_clid(struct nfs4_client *clp) {
 490         clp->cl_clientid.cl_boot = boot_time;
 491         clp->cl_clientid.cl_id = current_clientid++;
 492 }
 493
 494 static void
 495 gen_confirm(struct nfs4_client *clp) {
 496         struct timespec         tv;
 497         u32 *                   p;
 498
 499         tv = CURRENT_TIME;
 500         p = (u32 *)clp->cl_confirm.data;
 501         *p++ = tv.tv_sec;
 502         *p++ = tv.tv_nsec;
 503 }
 504
 505 static int
 506 check_name(struct xdr_netobj name) {
 507
 508         if (name.len == 0)
 509                 return 0;
 510         if (name.len > NFS4_OPAQUE_LIMIT) {
 511                 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
 512                 return 0;
 513         }
 514         return 1;
 515 }
 516
 517 static void
 518 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 519 {
 520         unsigned int idhashval;
 521
 522         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 523         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 524         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 525         list_add_tail(&clp->cl_lru, &client_lru);
 526         clp->cl_time = get_seconds();
 527 }
 528
 529 static void
 530 move_to_confirmed(struct nfs4_client *clp)
 531 {
 532         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 533         unsigned int strhashval;
 534
 535         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 536         list_del_init(&clp->cl_strhash);
 537         list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 538         strhashval = clientstr_hashval(clp->cl_recdir);
 539         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 540         renew_client(clp);
 541 }
 542
 543 static struct nfs4_client *
 544 find_confirmed_client(clientid_t *clid)
 545 {
 546         struct nfs4_client *clp;
 547         unsigned int idhashval = clientid_hashval(clid->cl_id);
 548
 549         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 550                 if (same_clid(&clp->cl_clientid, clid))
 551                         return clp;
 552         }
 553         return NULL;
 554 }
 555
 556 static struct nfs4_client *
 557 find_unconfirmed_client(clientid_t *clid)
 558 {
 559         struct nfs4_client *clp;
 560         unsigned int idhashval = clientid_hashval(clid->cl_id);
 561
 562         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 563                 if (same_clid(&clp->cl_clientid, clid))
 564                         return clp;
 565         }
 566         return NULL;
 567 }
 568
 569 static struct nfs4_client *
 570 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 571 {
 572         struct nfs4_client *clp;
 573
 574         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 575                 if (same_name(clp->cl_recdir, dname))
 576                         return clp;
 577         }
 578         return NULL;
 579 }
 580
 581 static struct nfs4_client *
 582 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 583 {
 584         struct nfs4_client *clp;
 585
 586         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 587                 if (same_name(clp->cl_recdir, dname))
 588                         return clp;
 589         }
 590         return NULL;
 591 }
 592
 593 /* a helper function for parse_callback */
 594 static int
 595 parse_octet(unsigned int *lenp, char **addrp)
 596 {
 597         unsigned int len = *lenp;
 598         char *p = *addrp;
 599         int n = -1;
 600         char c;
 601
 602         for (;;) {
 603                 if (!len)
 604                         break;
 605                 len--;
 606                 c = *p++;
 607                 if (c == '.')
 608                         break;
 609                 if ((c < '0') || (c > '9')) {
 610                         n = -1;
 611                         break;
 612                 }
 613                 if (n < 0)
 614                         n = 0;
 615                 n = (n * 10) + (c - '0');
 616                 if (n > 255) {
 617                         n = -1;
 618                         break;
 619                 }
 620         }
 621         *lenp = len;
 622         *addrp = p;
 623         return n;
 624 }
 625
 626 /* parse and set the setclientid ipv4 callback address */
 627 static int
 628 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 629 {
 630         int temp = 0;
 631         u32 cbaddr = 0;
 632         u16 cbport = 0;
 633         u32 addrlen = addr_len;
 634         char *addr = addr_val;
 635         int i, shift;
 636
 637         /* ipaddress */
 638         shift = 24;
 639         for(i = 4; i > 0  ; i--) {
 640                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 641                         return 0;
 642                 }
 643                 cbaddr |= (temp << shift);
 644                 if (shift > 0)
 645                 shift -= 8;
 646         }
 647         *cbaddrp = cbaddr;
 648
 649         /* port */
 650         shift = 8;
 651         for(i = 2; i > 0  ; i--) {
 652                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 653                         return 0;
 654                 }
 655                 cbport |= (temp << shift);
 656                 if (shift > 0)
 657                         shift -= 8;
 658         }
 659         *cbportp = cbport;
 660         return 1;
 661 }
 662
 663 static void
 664 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 665 {
 666         struct nfs4_callback *cb = &clp->cl_callback;
 667
 668         /* Currently, we only support tcp for the callback channel */
 669         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 670                 goto out_err;
 671
 672         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 673                          &cb->cb_addr, &cb->cb_port)))
 674                 goto out_err;
 675         cb->cb_prog = se->se_callback_prog;
 676         cb->cb_ident = se->se_callback_ident;
 677         return;
 678 out_err:
 679         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 680                 "will not receive delegations\n",
 681                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 682
 683         return;
 684 }
 685
 686 /*
 687  * RFC 3010 has a complex implmentation description of processing a
 688  * SETCLIENTID request consisting of 5 bullets, labeled as
 689  * CASE0 - CASE4 below.
 690  *
 691  * NOTES:
 692  *      callback information will be processed in a future patch
 693  *
 694  *      an unconfirmed record is added when:
 695  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 696  *      CASE 1: confirmed record found with matching name, principal,
 697  *              verifier, and clientid.
 698  *      CASE 2: confirmed record found with matching name, principal,
 699  *              and there is no unconfirmed record with matching
 700  *              name and principal
 701  *
 702  *      an unconfirmed record is replaced when:
 703  *      CASE 3: confirmed record found with matching name, principal,
 704  *              and an unconfirmed record is found with matching
 705  *              name, principal, and with clientid and
 706  *              confirm that does not match the confirmed record.
 707  *      CASE 4: there is no confirmed record with matching name and
 708  *              principal. there is an unconfirmed record with
 709  *              matching name, principal.
 710  *
 711  *      an unconfirmed record is deleted when:
 712  *      CASE 1: an unconfirmed record that matches input name, verifier,
 713  *              and confirmed clientid.
 714  *      CASE 4: any unconfirmed records with matching name and principal
 715  *              that exist after an unconfirmed record has been replaced
 716  *              as described above.
 717  *
 718  */
 719 __be32
 720 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 721                   struct nfsd4_setclientid *setclid)
 722 {
 723         struct sockaddr_in      *sin = svc_addr_in(rqstp);
 724         struct xdr_netobj       clname = {
 725                 .len = setclid->se_namelen,
 726                 .data = setclid->se_name,
 727         };
 728         nfs4_verifier           clverifier = setclid->se_verf;
 729         unsigned int            strhashval;
 730         struct nfs4_client      *conf, *unconf, *new;
 731         __be32                  status;
 732         char                    dname[HEXDIR_LEN];
 733
 734         if (!check_name(clname))
 735                 return nfserr_inval;
 736
 737         status = nfs4_make_rec_clidname(dname, &clname);
 738         if (status)
 739                 return status;
 740
 741         /*
 742          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 743          * We get here on a DRC miss.
 744          */
 745
 746         strhashval = clientstr_hashval(dname);
 747
 748         nfs4_lock_state();
 749         conf = find_confirmed_client_by_str(dname, strhashval);
 750         if (conf) {
 751                 /*
 752                  * CASE 0:
 753                  * clname match, confirmed, different principal
 754                  * or different ip_address
 755                  */
 756                 status = nfserr_clid_inuse;
 757                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
 758                                 || conf->cl_addr != sin->sin_addr.s_addr) {
 759                         dprintk("NFSD: setclientid: string in use by client"
 760                                 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
 761                         goto out;
 762                 }
 763         }
 764         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 765         status = nfserr_resource;
 766         if (!conf) {
 767                 /*
 768                  * CASE 4:
 769                  * placed first, because it is the normal case.
 770                  */
 771                 if (unconf)
 772                         expire_client(unconf);
 773                 new = create_client(clname, dname);
 774                 if (new == NULL)
 775                         goto out;
 776                 gen_clid(new);
 777         } else if (same_verf(&conf->cl_verifier, &clverifier)) {
 778                 /*
 779                  * CASE 1:
 780                  * cl_name match, confirmed, principal match
 781                  * verifier match: probable callback update
 782                  *
 783                  * remove any unconfirmed nfs4_client with
 784                  * matching cl_name, cl_verifier, and cl_clientid
 785                  *
 786                  * create and insert an unconfirmed nfs4_client with same
 787                  * cl_name, cl_verifier, and cl_clientid as existing
 788                  * nfs4_client,  but with the new callback info and a
 789                  * new cl_confirm
 790                  */
 791                 if (unconf) {
 792                         /* Note this is removing unconfirmed {*x***},
 793                          * which is stronger than RFC recommended {vxc**}.
 794                          * This has the advantage that there is at most
 795                          * one {*x***} in either list at any time.
 796                          */
 797                         expire_client(unconf);
 798                 }
 799                 new = create_client(clname, dname);
 800                 if (new == NULL)
 801                         goto out;
 802                 copy_clid(new, conf);
 803         } else if (!unconf) {
 804                 /*
 805                  * CASE 2:
 806                  * clname match, confirmed, principal match
 807                  * verfier does not match
 808                  * no unconfirmed. create a new unconfirmed nfs4_client
 809                  * using input clverifier, clname, and callback info
 810                  * and generate a new cl_clientid and cl_confirm.
 811                  */
 812                 new = create_client(clname, dname);
 813                 if (new == NULL)
 814                         goto out;
 815                 gen_clid(new);
 816         } else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 817                 /*
 818                  * CASE3:
 819                  * confirmed found (name, principal match)
 820                  * confirmed verifier does not match input clverifier
 821                  *
 822                  * unconfirmed found (name match)
 823                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 824                  *
 825                  * remove unconfirmed.
 826                  *
 827                  * create an unconfirmed nfs4_client
 828                  * with same cl_name as existing confirmed nfs4_client,
 829                  * but with new callback info, new cl_clientid,
 830                  * new cl_verifier and a new cl_confirm
 831                  */
 832                 expire_client(unconf);
 833                 new = create_client(clname, dname);
 834                 if (new == NULL)
 835                         goto out;
 836                 gen_clid(new);
 837         } else {
 838                 /* No cases hit !!! */
 839                 status = nfserr_inval;
 840                 goto out;
 841
 842         }
 843         copy_verf(new, &clverifier);
 844         new->cl_addr = sin->sin_addr.s_addr;
 845         copy_cred(&new->cl_cred, &rqstp->rq_cred);
 846         gen_confirm(new);
 847         gen_callback(new, setclid);
 848         add_to_unconfirmed(new, strhashval);
 849         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 850         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 851         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 852         status = nfs_ok;
 853 out:
 854         nfs4_unlock_state();
 855         return status;
 856 }
 857
 858
 859 /*
 860  * RFC 3010 has a complex implmentation description of processing a
 861  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 862  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 863  *
 864  * NOTE: callback information will be processed here in a future patch
 865  */
 866 __be32
 867 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 868                          struct nfsd4_compound_state *cstate,
 869                          struct nfsd4_setclientid_confirm *setclientid_confirm)
 870 {
 871         struct sockaddr_in *sin = svc_addr_in(rqstp);
 872         struct nfs4_client *conf, *unconf;
 873         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 874         clientid_t * clid = &setclientid_confirm->sc_clientid;
 875         __be32 status;
 876
 877         if (STALE_CLIENTID(clid))
 878                 return nfserr_stale_clientid;
 879         /*
 880          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 881          * We get here on a DRC miss.
 882          */
 883
 884         nfs4_lock_state();
 885
 886         conf = find_confirmed_client(clid);
 887         unconf = find_unconfirmed_client(clid);
 888
 889         status = nfserr_clid_inuse;
 890         if (conf && conf->cl_addr != sin->sin_addr.s_addr)
 891                 goto out;
 892         if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
 893                 goto out;
 894
 895         if ((conf && unconf) &&
 896             (same_verf(&unconf->cl_confirm, &confirm)) &&
 897             (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 898             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 899             (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 900                 /* CASE 1:
 901                 * unconf record that matches input clientid and input confirm.
 902                 * conf record that matches input clientid.
 903                 * conf and unconf records match names, verifiers
 904                 */
 905                 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
 906                         status = nfserr_clid_inuse;
 907                 else {
 908                         /* XXX: We just turn off callbacks until we can handle
 909                           * change request correctly. */
 910                         atomic_set(&conf->cl_callback.cb_set, 0);
 911                         gen_confirm(conf);
 912                         nfsd4_remove_clid_dir(unconf);
 913                         expire_client(unconf);
 914                         status = nfs_ok;
 915
 916                 }
 917         } else if ((conf && !unconf) ||
 918             ((conf && unconf) &&
 919              (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 920               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 921                 /* CASE 2:
 922                  * conf record that matches input clientid.
 923                  * if unconf record matches input clientid, then
 924                  * unconf->cl_name or unconf->cl_verifier don't match the
 925                  * conf record.
 926                  */
 927                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
 928                         status = nfserr_clid_inuse;
 929                 else
 930                         status = nfs_ok;
 931         } else if (!conf && unconf
 932                         && same_verf(&unconf->cl_confirm, &confirm)) {
 933                 /* CASE 3:
 934                  * conf record not found.
 935                  * unconf record found.
 936                  * unconf->cl_confirm matches input confirm
 937                  */
 938                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 939                         status = nfserr_clid_inuse;
 940                 } else {
 941                         unsigned int hash =
 942                                 clientstr_hashval(unconf->cl_recdir);
 943                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 944                                                                         hash);
 945                         if (conf) {
 946                                 nfsd4_remove_clid_dir(conf);
 947                                 expire_client(conf);
 948                         }
 949                         move_to_confirmed(unconf);
 950                         conf = unconf;
 951                         status = nfs_ok;
 952                 }
 953         } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
 954             && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
 955                                                                 &confirm)))) {
 956                 /* CASE 4:
 957                  * conf record not found, or if conf, conf->cl_confirm does not
 958                  * match input confirm.
 959                  * unconf record not found, or if unconf, unconf->cl_confirm
 960                  * does not match input confirm.
 961                  */
 962                 status = nfserr_stale_clientid;
 963         } else {
 964                 /* check that we have hit one of the cases...*/
 965                 status = nfserr_clid_inuse;
 966         }
 967 out:
 968         if (!status)
 969                 nfsd4_probe_callback(conf);
 970         nfs4_unlock_state();
 971         return status;
 972 }
 973
 974 /* OPEN Share state helper functions */
 975 static inline struct nfs4_file *
 976 alloc_init_file(struct inode *ino)
 977 {
 978         struct nfs4_file *fp;
 979         unsigned int hashval = file_hashval(ino);
 980
 981         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 982         if (fp) {
 983                 kref_init(&fp->fi_ref);
 984                 INIT_LIST_HEAD(&fp->fi_hash);
 985                 INIT_LIST_HEAD(&fp->fi_stateids);
 986                 INIT_LIST_HEAD(&fp->fi_delegations);
 987                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 988                 fp->fi_inode = igrab(ino);
 989                 fp->fi_id = current_fileid++;
 990                 fp->fi_had_conflict = false;
 991                 return fp;
 992         }
 993         return NULL;
 994 }
 995
 996 static void
 997 nfsd4_free_slab(struct kmem_cache **slab)
 998 {
 999         if (*slab == NULL)
1000                 return;
1001         kmem_cache_destroy(*slab);
1002         *slab = NULL;
1003 }
1004
1005 void
1006 nfsd4_free_slabs(void)
1007 {
1008         nfsd4_free_slab(&stateowner_slab);
1009         nfsd4_free_slab(&file_slab);
1010         nfsd4_free_slab(&stateid_slab);
1011         nfsd4_free_slab(&deleg_slab);
1012 }
1013
1014 static int
1015 nfsd4_init_slabs(void)
1016 {
1017         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1018                         sizeof(struct nfs4_stateowner), 0, 0, NULL);
1019         if (stateowner_slab == NULL)
1020                 goto out_nomem;
1021         file_slab = kmem_cache_create("nfsd4_files",
1022                         sizeof(struct nfs4_file), 0, 0, NULL);
1023         if (file_slab == NULL)
1024                 goto out_nomem;
1025         stateid_slab = kmem_cache_create("nfsd4_stateids",
1026                         sizeof(struct nfs4_stateid), 0, 0, NULL);
1027         if (stateid_slab == NULL)
1028                 goto out_nomem;
1029         deleg_slab = kmem_cache_create("nfsd4_delegations",
1030                         sizeof(struct nfs4_delegation), 0, 0, NULL);
1031         if (deleg_slab == NULL)
1032                 goto out_nomem;
1033         return 0;
1034 out_nomem:
1035         nfsd4_free_slabs();
1036         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1037         return -ENOMEM;
1038 }
1039
1040 void
1041 nfs4_free_stateowner(struct kref *kref)
1042 {
1043         struct nfs4_stateowner *sop =
1044                 container_of(kref, struct nfs4_stateowner, so_ref);
1045         kfree(sop->so_owner.data);
1046         kmem_cache_free(stateowner_slab, sop);
1047 }
1048
1049 static inline struct nfs4_stateowner *
1050 alloc_stateowner(struct xdr_netobj *owner)
1051 {
1052         struct nfs4_stateowner *sop;
1053
1054         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1055                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1056                         memcpy(sop->so_owner.data, owner->data, owner->len);
1057                         sop->so_owner.len = owner->len;
1058                         kref_init(&sop->so_ref);
1059                         return sop;
1060                 }
1061                 kmem_cache_free(stateowner_slab, sop);
1062         }
1063         return NULL;
1064 }
1065
1066 static struct nfs4_stateowner *
1067 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1068         struct nfs4_stateowner *sop;
1069         struct nfs4_replay *rp;
1070         unsigned int idhashval;
1071
1072         if (!(sop = alloc_stateowner(&open->op_owner)))
1073                 return NULL;
1074         idhashval = ownerid_hashval(current_ownerid);
1075         INIT_LIST_HEAD(&sop->so_idhash);
1076         INIT_LIST_HEAD(&sop->so_strhash);
1077         INIT_LIST_HEAD(&sop->so_perclient);
1078         INIT_LIST_HEAD(&sop->so_stateids);
1079         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1080         INIT_LIST_HEAD(&sop->so_close_lru);
1081         sop->so_time = 0;
1082         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1083         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1084         list_add(&sop->so_perclient, &clp->cl_openowners);
1085         sop->so_is_open_owner = 1;
1086         sop->so_id = current_ownerid++;
1087         sop->so_client = clp;
1088         sop->so_seqid = open->op_seqid;
1089         sop->so_confirmed = 0;
1090         rp = &sop->so_replay;
1091         rp->rp_status = nfserr_serverfault;
1092         rp->rp_buflen = 0;
1093         rp->rp_buf = rp->rp_ibuf;
1094         return sop;
1095 }
1096
1097 static void
1098 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1099 {
1100         struct nfs4_stateowner *lock_sop;
1101
1102         while (!list_empty(&open_stp->st_lockowners)) {
1103                 lock_sop = list_entry(open_stp->st_lockowners.next,
1104                                 struct nfs4_stateowner, so_perstateid);
1105                 /* list_del(&open_stp->st_lockowners);  */
1106                 BUG_ON(lock_sop->so_is_open_owner);
1107                 release_stateowner(lock_sop);
1108         }
1109 }
1110
1111 static void
1112 unhash_stateowner(struct nfs4_stateowner *sop)
1113 {
1114         struct nfs4_stateid *stp;
1115
1116         list_del(&sop->so_idhash);
1117         list_del(&sop->so_strhash);
1118         if (sop->so_is_open_owner)
1119                 list_del(&sop->so_perclient);
1120         list_del(&sop->so_perstateid);
1121         while (!list_empty(&sop->so_stateids)) {
1122                 stp = list_entry(sop->so_stateids.next,
1123                         struct nfs4_stateid, st_perstateowner);
1124                 if (sop->so_is_open_owner)
1125                         release_stateid(stp, OPEN_STATE);
1126                 else
1127                         release_stateid(stp, LOCK_STATE);
1128         }
1129 }
1130
1131 static void
1132 release_stateowner(struct nfs4_stateowner *sop)
1133 {
1134         unhash_stateowner(sop);
1135         list_del(&sop->so_close_lru);
1136         nfs4_put_stateowner(sop);
1137 }
1138
1139 static inline void
1140 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1141         struct nfs4_stateowner *sop = open->op_stateowner;
1142         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1143
1144         INIT_LIST_HEAD(&stp->st_hash);
1145         INIT_LIST_HEAD(&stp->st_perstateowner);
1146         INIT_LIST_HEAD(&stp->st_lockowners);
1147         INIT_LIST_HEAD(&stp->st_perfile);
1148         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1149         list_add(&stp->st_perstateowner, &sop->so_stateids);
1150         list_add(&stp->st_perfile, &fp->fi_stateids);
1151         stp->st_stateowner = sop;
1152         get_nfs4_file(fp);
1153         stp->st_file = fp;
1154         stp->st_stateid.si_boot = boot_time;
1155         stp->st_stateid.si_stateownerid = sop->so_id;
1156         stp->st_stateid.si_fileid = fp->fi_id;
1157         stp->st_stateid.si_generation = 0;
1158         stp->st_access_bmap = 0;
1159         stp->st_deny_bmap = 0;
1160         __set_bit(open->op_share_access, &stp->st_access_bmap);
1161         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1162         stp->st_openstp = NULL;
1163 }
1164
1165 static void
1166 release_stateid(struct nfs4_stateid *stp, int flags)
1167 {
1168         struct file *filp = stp->st_vfs_file;
1169
1170         list_del(&stp->st_hash);
1171         list_del(&stp->st_perfile);
1172         list_del(&stp->st_perstateowner);
1173         if (flags & OPEN_STATE) {
1174                 release_stateid_lockowners(stp);
1175                 stp->st_vfs_file = NULL;
1176                 nfsd_close(filp);
1177         } else if (flags & LOCK_STATE)
1178                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1179         put_nfs4_file(stp->st_file);
1180         kmem_cache_free(stateid_slab, stp);
1181 }
1182
1183 static void
1184 move_to_close_lru(struct nfs4_stateowner *sop)
1185 {
1186         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1187
1188         list_move_tail(&sop->so_close_lru, &close_lru);
1189         sop->so_time = get_seconds();
1190 }
1191
1192 static int
1193 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1194                                                         clientid_t *clid)
1195 {
1196         return (sop->so_owner.len == owner->len) &&
1197                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1198                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1199 }
1200
1201 static struct nfs4_stateowner *
1202 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1203 {
1204         struct nfs4_stateowner *so = NULL;
1205
1206         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1207                 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1208                         return so;
1209         }
1210         return NULL;
1211 }
1212
1213 /* search file_hashtbl[] for file */
1214 static struct nfs4_file *
1215 find_file(struct inode *ino)
1216 {
1217         unsigned int hashval = file_hashval(ino);
1218         struct nfs4_file *fp;
1219
1220         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1221                 if (fp->fi_inode == ino) {
1222                         get_nfs4_file(fp);
1223                         return fp;
1224                 }
1225         }
1226         return NULL;
1227 }
1228
1229 static int access_valid(u32 x)
1230 {
1231         return (x > 0 && x < 4);
1232 }
1233
1234 static int deny_valid(u32 x)
1235 {
1236         return (x >= 0 && x < 5);
1237 }
1238
1239 static void
1240 set_access(unsigned int *access, unsigned long bmap) {
1241         int i;
1242
1243         *access = 0;
1244         for (i = 1; i < 4; i++) {
1245                 if (test_bit(i, &bmap))
1246                         *access |= i;
1247         }
1248 }
1249
1250 static void
1251 set_deny(unsigned int *deny, unsigned long bmap) {
1252         int i;
1253
1254         *deny = 0;
1255         for (i = 0; i < 4; i++) {
1256                 if (test_bit(i, &bmap))
1257                         *deny |= i ;
1258         }
1259 }
1260
1261 static int
1262 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1263         unsigned int access, deny;
1264
1265         set_access(&access, stp->st_access_bmap);
1266         set_deny(&deny, stp->st_deny_bmap);
1267         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1268                 return 0;
1269         return 1;
1270 }
1271
1272 /*
1273  * Called to check deny when READ with all zero stateid or
1274  * WRITE with all zero or all one stateid
1275  */
1276 static __be32
1277 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1278 {
1279         struct inode *ino = current_fh->fh_dentry->d_inode;
1280         struct nfs4_file *fp;
1281         struct nfs4_stateid *stp;
1282         __be32 ret;
1283
1284         dprintk("NFSD: nfs4_share_conflict\n");
1285
1286         fp = find_file(ino);
1287         if (!fp)
1288                 return nfs_ok;
1289         ret = nfserr_locked;
1290         /* Search for conflicting share reservations */
1291         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1292                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1293                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1294                         goto out;
1295         }
1296         ret = nfs_ok;
1297 out:
1298         put_nfs4_file(fp);
1299         return ret;
1300 }
1301
1302 static inline void
1303 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1304 {
1305         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1306                 put_write_access(filp->f_path.dentry->d_inode);
1307                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1308         }
1309 }
1310
1311 /*
1312  * Recall a delegation
1313  */
1314 static int
1315 do_recall(void *__dp)
1316 {
1317         struct nfs4_delegation *dp = __dp;
1318
1319         dp->dl_file->fi_had_conflict = true;
1320         nfsd4_cb_recall(dp);
1321         return 0;
1322 }
1323
1324 /*
1325  * Spawn a thread to perform a recall on the delegation represented
1326  * by the lease (file_lock)
1327  *
1328  * Called from break_lease() with lock_kernel() held.
1329  * Note: we assume break_lease will only call this *once* for any given
1330  * lease.
1331  */
1332 static
1333 void nfsd_break_deleg_cb(struct file_lock *fl)
1334 {
1335         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1336         struct task_struct *t;
1337
1338         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1339         if (!dp)
1340                 return;
1341
1342         /* We're assuming the state code never drops its reference
1343          * without first removing the lease.  Since we're in this lease
1344          * callback (and since the lease code is serialized by the kernel
1345          * lock) we know the server hasn't removed the lease yet, we know
1346          * it's safe to take a reference: */
1347         atomic_inc(&dp->dl_count);
1348         atomic_inc(&dp->dl_client->cl_count);
1349
1350         spin_lock(&recall_lock);
1351         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1352         spin_unlock(&recall_lock);
1353
1354         /* only place dl_time is set. protected by lock_kernel*/
1355         dp->dl_time = get_seconds();
1356
1357         /*
1358          * We don't want the locks code to timeout the lease for us;
1359          * we'll remove it ourself if the delegation isn't returned
1360          * in time.
1361          */
1362         fl->fl_break_time = 0;
1363
1364         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1365         if (IS_ERR(t)) {
1366                 struct nfs4_client *clp = dp->dl_client;
1367
1368                 printk(KERN_INFO "NFSD: Callback thread failed for "
1369                         "for client (clientid %08x/%08x)\n",
1370                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1371                 put_nfs4_client(dp->dl_client);
1372                 nfs4_put_delegation(dp);
1373         }
1374 }
1375
1376 /*
1377  * The file_lock is being reapd.
1378  *
1379  * Called by locks_free_lock() with lock_kernel() held.
1380  */
1381 static
1382 void nfsd_release_deleg_cb(struct file_lock *fl)
1383 {
1384         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1385
1386         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1387
1388         if (!(fl->fl_flags & FL_LEASE) || !dp)
1389                 return;
1390         dp->dl_flock = NULL;
1391 }
1392
1393 /*
1394  * Set the delegation file_lock back pointer.
1395  *
1396  * Called from setlease() with lock_kernel() held.
1397  */
1398 static
1399 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1400 {
1401         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1402
1403         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1404         if (!dp)
1405                 return;
1406         dp->dl_flock = new;
1407 }
1408
1409 /*
1410  * Called from setlease() with lock_kernel() held
1411  */
1412 static
1413 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1414 {
1415         struct nfs4_delegation *onlistd =
1416                 (struct nfs4_delegation *)onlist->fl_owner;
1417         struct nfs4_delegation *tryd =
1418                 (struct nfs4_delegation *)try->fl_owner;
1419
1420         if (onlist->fl_lmops != try->fl_lmops)
1421                 return 0;
1422
1423         return onlistd->dl_client == tryd->dl_client;
1424 }
1425
1426
1427 static
1428 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1429 {
1430         if (arg & F_UNLCK)
1431                 return lease_modify(onlist, arg);
1432         else
1433                 return -EAGAIN;
1434 }
1435
1436 static struct lock_manager_operations nfsd_lease_mng_ops = {
1437         .fl_break = nfsd_break_deleg_cb,
1438         .fl_release_private = nfsd_release_deleg_cb,
1439         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1440         .fl_mylease = nfsd_same_client_deleg_cb,
1441         .fl_change = nfsd_change_deleg_cb,
1442 };
1443
1444
1445 __be32
1446 nfsd4_process_open1(struct nfsd4_open *open)
1447 {
1448         clientid_t *clientid = &open->op_clientid;
1449         struct nfs4_client *clp = NULL;
1450         unsigned int strhashval;
1451         struct nfs4_stateowner *sop = NULL;
1452
1453         if (!check_name(open->op_owner))
1454                 return nfserr_inval;
1455
1456         if (STALE_CLIENTID(&open->op_clientid))
1457                 return nfserr_stale_clientid;
1458
1459         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1460         sop = find_openstateowner_str(strhashval, open);
1461         open->op_stateowner = sop;
1462         if (!sop) {
1463                 /* Make sure the client's lease hasn't expired. */
1464                 clp = find_confirmed_client(clientid);
1465                 if (clp == NULL)
1466                         return nfserr_expired;
1467                 goto renew;
1468         }
1469         if (!sop->so_confirmed) {
1470                 /* Replace unconfirmed owners without checking for replay. */
1471                 clp = sop->so_client;
1472                 release_stateowner(sop);
1473                 open->op_stateowner = NULL;
1474                 goto renew;
1475         }
1476         if (open->op_seqid == sop->so_seqid - 1) {
1477                 if (sop->so_replay.rp_buflen)
1478                         return nfserr_replay_me;
1479                 /* The original OPEN failed so spectacularly
1480                  * that we don't even have replay data saved!
1481                  * Therefore, we have no choice but to continue
1482                  * processing this OPEN; presumably, we'll
1483                  * fail again for the same reason.
1484                  */
1485                 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1486                 goto renew;
1487         }
1488         if (open->op_seqid != sop->so_seqid)
1489                 return nfserr_bad_seqid;
1490 renew:
1491         if (open->op_stateowner == NULL) {
1492                 sop = alloc_init_open_stateowner(strhashval, clp, open);
1493                 if (sop == NULL)
1494                         return nfserr_resource;
1495                 open->op_stateowner = sop;
1496         }
1497         list_del_init(&sop->so_close_lru);
1498         renew_client(sop->so_client);
1499         return nfs_ok;
1500 }
1501
1502 static inline __be32
1503 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1504 {
1505         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1506                 return nfserr_openmode;
1507         else
1508                 return nfs_ok;
1509 }
1510
1511 static struct nfs4_delegation *
1512 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1513 {
1514         struct nfs4_delegation *dp;
1515
1516         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1517                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1518                         return dp;
1519         }
1520         return NULL;
1521 }
1522
1523 static __be32
1524 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1525                 struct nfs4_delegation **dp)
1526 {
1527         int flags;
1528         __be32 status = nfserr_bad_stateid;
1529
1530         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1531         if (*dp == NULL)
1532                 goto out;
1533         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1534                                                 RD_STATE : WR_STATE;
1535         status = nfs4_check_delegmode(*dp, flags);
1536         if (status)
1537                 *dp = NULL;
1538 out:
1539         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1540                 return nfs_ok;
1541         if (status)
1542                 return status;
1543         open->op_stateowner->so_confirmed = 1;
1544         return nfs_ok;
1545 }
1546
1547 static __be32
1548 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1549 {
1550         struct nfs4_stateid *local;
1551         __be32 status = nfserr_share_denied;
1552         struct nfs4_stateowner *sop = open->op_stateowner;
1553
1554         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1555                 /* ignore lock owners */
1556                 if (local->st_stateowner->so_is_open_owner == 0)
1557                         continue;
1558                 /* remember if we have seen this open owner */
1559                 if (local->st_stateowner == sop)
1560                         *stpp = local;
1561                 /* check for conflicting share reservations */
1562                 if (!test_share(local, open))
1563                         goto out;
1564         }
1565         status = 0;
1566 out:
1567         return status;
1568 }
1569
1570 static inline struct nfs4_stateid *
1571 nfs4_alloc_stateid(void)
1572 {
1573         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1574 }
1575
1576 static __be32
1577 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1578                 struct nfs4_delegation *dp,
1579                 struct svc_fh *cur_fh, int flags)
1580 {
1581         struct nfs4_stateid *stp;
1582
1583         stp = nfs4_alloc_stateid();
1584         if (stp == NULL)
1585                 return nfserr_resource;
1586
1587         if (dp) {
1588                 get_file(dp->dl_vfs_file);
1589                 stp->st_vfs_file = dp->dl_vfs_file;
1590         } else {
1591                 __be32 status;
1592                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1593                                 &stp->st_vfs_file);
1594                 if (status) {
1595                         if (status == nfserr_dropit)
1596                                 status = nfserr_jukebox;
1597                         kmem_cache_free(stateid_slab, stp);
1598                         return status;
1599                 }
1600         }
1601         *stpp = stp;
1602         return 0;
1603 }
1604
1605 static inline __be32
1606 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1607                 struct nfsd4_open *open)
1608 {
1609         struct iattr iattr = {
1610                 .ia_valid = ATTR_SIZE,
1611                 .ia_size = 0,
1612         };
1613         if (!open->op_truncate)
1614                 return 0;
1615         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1616                 return nfserr_inval;
1617         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1618 }
1619
1620 static __be32
1621 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1622 {
1623         struct file *filp = stp->st_vfs_file;
1624         struct inode *inode = filp->f_path.dentry->d_inode;
1625         unsigned int share_access, new_writer;
1626         __be32 status;
1627
1628         set_access(&share_access, stp->st_access_bmap);
1629         new_writer = (~share_access) & open->op_share_access
1630                         & NFS4_SHARE_ACCESS_WRITE;
1631
1632         if (new_writer) {
1633                 int err = get_write_access(inode);
1634                 if (err)
1635                         return nfserrno(err);
1636         }
1637         status = nfsd4_truncate(rqstp, cur_fh, open);
1638         if (status) {
1639                 if (new_writer)
1640                         put_write_access(inode);
1641                 return status;
1642         }
1643         /* remember the open */
1644         filp->f_mode |= open->op_share_access;
1645         set_bit(open->op_share_access, &stp->st_access_bmap);
1646         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1647
1648         return nfs_ok;
1649 }
1650
1651
1652 static void
1653 nfs4_set_claim_prev(struct nfsd4_open *open)
1654 {
1655         open->op_stateowner->so_confirmed = 1;
1656         open->op_stateowner->so_client->cl_firststate = 1;
1657 }
1658
1659 /*
1660  * Attempt to hand out a delegation.
1661  */
1662 static void
1663 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1664 {
1665         struct nfs4_delegation *dp;
1666         struct nfs4_stateowner *sop = stp->st_stateowner;
1667         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1668         struct file_lock fl, *flp = &fl;
1669         int status, flag = 0;
1670
1671         flag = NFS4_OPEN_DELEGATE_NONE;
1672         open->op_recall = 0;
1673         switch (open->op_claim_type) {
1674                 case NFS4_OPEN_CLAIM_PREVIOUS:
1675                         if (!atomic_read(&cb->cb_set))
1676                                 open->op_recall = 1;
1677                         flag = open->op_delegate_type;
1678                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1679                                 goto out;
1680                         break;
1681                 case NFS4_OPEN_CLAIM_NULL:
1682                         /* Let's not give out any delegations till everyone's
1683                          * had the chance to reclaim theirs.... */
1684                         if (nfs4_in_grace())
1685                                 goto out;
1686                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1687                                 goto out;
1688                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1689                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1690                         else
1691                                 flag = NFS4_OPEN_DELEGATE_READ;
1692                         break;
1693                 default:
1694                         goto out;
1695         }
1696
1697         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1698         if (dp == NULL) {
1699                 flag = NFS4_OPEN_DELEGATE_NONE;
1700                 goto out;
1701         }
1702         locks_init_lock(&fl);
1703         fl.fl_lmops = &nfsd_lease_mng_ops;
1704         fl.fl_flags = FL_LEASE;
1705         fl.fl_end = OFFSET_MAX;
1706         fl.fl_owner =  (fl_owner_t)dp;
1707         fl.fl_file = stp->st_vfs_file;
1708         fl.fl_pid = current->tgid;
1709
1710         /* vfs_setlease checks to see if delegation should be handed out.
1711          * the lock_manager callbacks fl_mylease and fl_change are used
1712          */
1713         if ((status = vfs_setlease(stp->st_vfs_file,
1714                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1715                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1716                 unhash_delegation(dp);
1717                 flag = NFS4_OPEN_DELEGATE_NONE;
1718                 goto out;
1719         }
1720
1721         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1722
1723         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1724                      dp->dl_stateid.si_boot,
1725                      dp->dl_stateid.si_stateownerid,
1726                      dp->dl_stateid.si_fileid,
1727                      dp->dl_stateid.si_generation);
1728 out:
1729         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1730                         && flag == NFS4_OPEN_DELEGATE_NONE
1731                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1732                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1733         open->op_delegate_type = flag;
1734 }
1735
1736 /*
1737  * called with nfs4_lock_state() held.
1738  */
1739 __be32
1740 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1741 {
1742         struct nfs4_file *fp = NULL;
1743         struct inode *ino = current_fh->fh_dentry->d_inode;
1744         struct nfs4_stateid *stp = NULL;
1745         struct nfs4_delegation *dp = NULL;
1746         __be32 status;
1747
1748         status = nfserr_inval;
1749         if (!access_valid(open->op_share_access)
1750                         || !deny_valid(open->op_share_deny))
1751                 goto out;
1752         /*
1753          * Lookup file; if found, lookup stateid and check open request,
1754          * and check for delegations in the process of being recalled.
1755          * If not found, create the nfs4_file struct
1756          */
1757         fp = find_file(ino);
1758         if (fp) {
1759                 if ((status = nfs4_check_open(fp, open, &stp)))
1760                         goto out;
1761                 status = nfs4_check_deleg(fp, open, &dp);
1762                 if (status)
1763                         goto out;
1764         } else {
1765                 status = nfserr_bad_stateid;
1766                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1767                         goto out;
1768                 status = nfserr_resource;
1769                 fp = alloc_init_file(ino);
1770                 if (fp == NULL)
1771                         goto out;
1772         }
1773
1774         /*
1775          * OPEN the file, or upgrade an existing OPEN.
1776          * If truncate fails, the OPEN fails.
1777          */
1778         if (stp) {
1779                 /* Stateid was found, this is an OPEN upgrade */
1780                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1781                 if (status)
1782                         goto out;
1783                 update_stateid(&stp->st_stateid);
1784         } else {
1785                 /* Stateid was not found, this is a new OPEN */
1786                 int flags = 0;
1787                 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1788                         flags |= MAY_READ;
1789                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1790                         flags |= MAY_WRITE;
1791                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1792                 if (status)
1793                         goto out;
1794                 init_stateid(stp, fp, open);
1795                 status = nfsd4_truncate(rqstp, current_fh, open);
1796                 if (status) {
1797                         release_stateid(stp, OPEN_STATE);
1798                         goto out;
1799                 }
1800         }
1801         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1802
1803         /*
1804         * Attempt to hand out a delegation. No error return, because the
1805         * OPEN succeeds even if we fail.
1806         */
1807         nfs4_open_delegation(current_fh, open, stp);
1808
1809         status = nfs_ok;
1810
1811         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1812                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1813                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1814 out:
1815         if (fp)
1816                 put_nfs4_file(fp);
1817         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1818                 nfs4_set_claim_prev(open);
1819         /*
1820         * To finish the open response, we just need to set the rflags.
1821         */
1822         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1823         if (!open->op_stateowner->so_confirmed)
1824                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1825
1826         return status;
1827 }
1828
1829 static struct workqueue_struct *laundry_wq;
1830 static void laundromat_main(struct work_struct *);
1831 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1832
1833 __be32
1834 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1835             clientid_t *clid)
1836 {
1837         struct nfs4_client *clp;
1838         __be32 status;
1839
1840         nfs4_lock_state();
1841         dprintk("process_renew(%08x/%08x): starting\n",
1842                         clid->cl_boot, clid->cl_id);
1843         status = nfserr_stale_clientid;
1844         if (STALE_CLIENTID(clid))
1845                 goto out;
1846         clp = find_confirmed_client(clid);
1847         status = nfserr_expired;
1848         if (clp == NULL) {
1849                 /* We assume the client took too long to RENEW. */
1850                 dprintk("nfsd4_renew: clientid not found!\n");
1851                 goto out;
1852         }
1853         renew_client(clp);
1854         status = nfserr_cb_path_down;
1855         if (!list_empty(&clp->cl_delegations)
1856                         && !atomic_read(&clp->cl_callback.cb_set))
1857                 goto out;
1858         status = nfs_ok;
1859 out:
1860         nfs4_unlock_state();
1861         return status;
1862 }
1863
1864 static void
1865 end_grace(void)
1866 {
1867         dprintk("NFSD: end of grace period\n");
1868         nfsd4_recdir_purge_old();
1869         in_grace = 0;
1870 }
1871
1872 static time_t
1873 nfs4_laundromat(void)
1874 {
1875         struct nfs4_client *clp;
1876         struct nfs4_stateowner *sop;
1877         struct nfs4_delegation *dp;
1878         struct list_head *pos, *next, reaplist;
1879         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1880         time_t t, clientid_val = NFSD_LEASE_TIME;
1881         time_t u, test_val = NFSD_LEASE_TIME;
1882
1883         nfs4_lock_state();
1884
1885         dprintk("NFSD: laundromat service - starting\n");
1886         if (in_grace)
1887                 end_grace();
1888         list_for_each_safe(pos, next, &client_lru) {
1889                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1890                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1891                         t = clp->cl_time - cutoff;
1892                         if (clientid_val > t)
1893                                 clientid_val = t;
1894                         break;
1895                 }
1896                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1897                         clp->cl_clientid.cl_id);
1898                 nfsd4_remove_clid_dir(clp);
1899                 expire_client(clp);
1900         }
1901         INIT_LIST_HEAD(&reaplist);
1902         spin_lock(&recall_lock);
1903         list_for_each_safe(pos, next, &del_recall_lru) {
1904                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1905                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1906                         u = dp->dl_time - cutoff;
1907                         if (test_val > u)
1908                                 test_val = u;
1909                         break;
1910                 }
1911                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1912                                     dp, dp->dl_flock);
1913                 list_move(&dp->dl_recall_lru, &reaplist);
1914         }
1915         spin_unlock(&recall_lock);
1916         list_for_each_safe(pos, next, &reaplist) {
1917                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1918                 list_del_init(&dp->dl_recall_lru);
1919                 unhash_delegation(dp);
1920         }
1921         test_val = NFSD_LEASE_TIME;
1922         list_for_each_safe(pos, next, &close_lru) {
1923                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1924                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1925                         u = sop->so_time - cutoff;
1926                         if (test_val > u)
1927                                 test_val = u;
1928                         break;
1929                 }
1930                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1931                         sop->so_id);
1932                 release_stateowner(sop);
1933         }
1934         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1935                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1936         nfs4_unlock_state();
1937         return clientid_val;
1938 }
1939
1940 void
1941 laundromat_main(struct work_struct *not_used)
1942 {
1943         time_t t;
1944
1945         t = nfs4_laundromat();
1946         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1947         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1948 }
1949
1950 static struct nfs4_stateowner *
1951 search_close_lru(u32 st_id, int flags)
1952 {
1953         struct nfs4_stateowner *local = NULL;
1954
1955         if (flags & CLOSE_STATE) {
1956                 list_for_each_entry(local, &close_lru, so_close_lru) {
1957                         if (local->so_id == st_id)
1958                                 return local;
1959                 }
1960         }
1961         return NULL;
1962 }
1963
1964 static inline int
1965 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1966 {
1967         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1968 }
1969
1970 static int
1971 STALE_STATEID(stateid_t *stateid)
1972 {
1973         if (stateid->si_boot == boot_time)
1974                 return 0;
1975         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1976                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1977                 stateid->si_generation);
1978         return 1;
1979 }
1980
1981 static inline int
1982 access_permit_read(unsigned long access_bmap)
1983 {
1984         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1985                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1986                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1987 }
1988
1989 static inline int
1990 access_permit_write(unsigned long access_bmap)
1991 {
1992         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1993                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1994 }
1995
1996 static
1997 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1998 {
1999         __be32 status = nfserr_openmode;
2000
2001         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2002                 goto out;
2003         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2004                 goto out;
2005         status = nfs_ok;
2006 out:
2007         return status;
2008 }
2009
2010 static inline __be32
2011 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2012 {
2013         /* Trying to call delegreturn with a special stateid? Yuch: */
2014         if (!(flags & (RD_STATE | WR_STATE)))
2015                 return nfserr_bad_stateid;
2016         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2017                 return nfs_ok;
2018         else if (nfs4_in_grace()) {
2019                 /* Answer in remaining cases depends on existance of
2020                  * conflicting state; so we must wait out the grace period. */
2021                 return nfserr_grace;
2022         } else if (flags & WR_STATE)
2023                 return nfs4_share_conflict(current_fh,
2024                                 NFS4_SHARE_DENY_WRITE);
2025         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2026                 return nfs4_share_conflict(current_fh,
2027                                 NFS4_SHARE_DENY_READ);
2028 }
2029
2030 /*
2031  * Allow READ/WRITE during grace period on recovered state only for files
2032  * that are not able to provide mandatory locking.
2033  */
2034 static inline int
2035 io_during_grace_disallowed(struct inode *inode, int flags)
2036 {
2037         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2038                 && mandatory_lock(inode);
2039 }
2040
2041 /*
2042 * Checks for stateid operations
2043 */
2044 __be32
2045 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2046 {
2047         struct nfs4_stateid *stp = NULL;
2048         struct nfs4_delegation *dp = NULL;
2049         stateid_t *stidp;
2050         struct inode *ino = current_fh->fh_dentry->d_inode;
2051         __be32 status;
2052
2053         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2054                 stateid->si_boot, stateid->si_stateownerid,
2055                 stateid->si_fileid, stateid->si_generation);
2056         if (filpp)
2057                 *filpp = NULL;
2058
2059         if (io_during_grace_disallowed(ino, flags))
2060                 return nfserr_grace;
2061
2062         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2063                 return check_special_stateids(current_fh, stateid, flags);
2064
2065         /* STALE STATEID */
2066         status = nfserr_stale_stateid;
2067         if (STALE_STATEID(stateid))
2068                 goto out;
2069
2070         /* BAD STATEID */
2071         status = nfserr_bad_stateid;
2072         if (!stateid->si_fileid) { /* delegation stateid */
2073                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2074                         dprintk("NFSD: delegation stateid not found\n");
2075                         goto out;
2076                 }
2077                 stidp = &dp->dl_stateid;
2078         } else { /* open or lock stateid */
2079                 if (!(stp = find_stateid(stateid, flags))) {
2080                         dprintk("NFSD: open or lock stateid not found\n");
2081                         goto out;
2082                 }
2083                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2084                         goto out;
2085                 if (!stp->st_stateowner->so_confirmed)
2086                         goto out;
2087                 stidp = &stp->st_stateid;
2088         }
2089         if (stateid->si_generation > stidp->si_generation)
2090                 goto out;
2091
2092         /* OLD STATEID */
2093         status = nfserr_old_stateid;
2094         if (stateid->si_generation < stidp->si_generation)
2095                 goto out;
2096         if (stp) {
2097                 if ((status = nfs4_check_openmode(stp,flags)))
2098                         goto out;
2099                 renew_client(stp->st_stateowner->so_client);
2100                 if (filpp)
2101                         *filpp = stp->st_vfs_file;
2102         } else if (dp) {
2103                 if ((status = nfs4_check_delegmode(dp, flags)))
2104                         goto out;
2105                 renew_client(dp->dl_client);
2106                 if (flags & DELEG_RET)
2107                         unhash_delegation(dp);
2108                 if (filpp)
2109                         *filpp = dp->dl_vfs_file;
2110         }
2111         status = nfs_ok;
2112 out:
2113         return status;
2114 }
2115
2116 static inline int
2117 setlkflg (int type)
2118 {
2119         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2120                 RD_STATE : WR_STATE;
2121 }
2122
2123 /*
2124  * Checks for sequence id mutating operations.
2125  */
2126 static __be32
2127 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)
2128 {
2129         struct nfs4_stateid *stp;
2130         struct nfs4_stateowner *sop;
2131
2132         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2133                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2134                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2135                 stateid->si_generation);
2136
2137         *stpp = NULL;
2138         *sopp = NULL;
2139
2140         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2141                 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2142                 return nfserr_bad_stateid;
2143         }
2144
2145         if (STALE_STATEID(stateid))
2146                 return nfserr_stale_stateid;
2147         /*
2148         * We return BAD_STATEID if filehandle doesn't match stateid,
2149         * the confirmed flag is incorrecly set, or the generation
2150         * number is incorrect.
2151         */
2152         stp = find_stateid(stateid, flags);
2153         if (stp == NULL) {
2154                 /*
2155                  * Also, we should make sure this isn't just the result of
2156                  * a replayed close:
2157                  */
2158                 sop = search_close_lru(stateid->si_stateownerid, flags);
2159                 if (sop == NULL)
2160                         return nfserr_bad_stateid;
2161                 *sopp = sop;
2162                 goto check_replay;
2163         }
2164
2165         if (lock) {
2166                 struct nfs4_stateowner *sop = stp->st_stateowner;
2167                 clientid_t *lockclid = &lock->v.new.clientid;
2168                 struct nfs4_client *clp = sop->so_client;
2169                 int lkflg = 0;
2170                 __be32 status;
2171
2172                 lkflg = setlkflg(lock->lk_type);
2173
2174                 if (lock->lk_is_new) {
2175                         if (!sop->so_is_open_owner)
2176                                 return nfserr_bad_stateid;
2177                         if (!same_clid(&clp->cl_clientid, lockclid))
2178                                return nfserr_bad_stateid;
2179                         /* stp is the open stateid */
2180                         status = nfs4_check_openmode(stp, lkflg);
2181                         if (status)
2182                                 return status;
2183                 } else {
2184                         /* stp is the lock stateid */
2185                         status = nfs4_check_openmode(stp->st_openstp, lkflg);
2186                         if (status)
2187                                 return status;
2188                }
2189         }
2190
2191         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2192                 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2193                 return nfserr_bad_stateid;
2194         }
2195
2196         *stpp = stp;
2197         *sopp = sop = stp->st_stateowner;
2198
2199         /*
2200         *  We now validate the seqid and stateid generation numbers.
2201         *  For the moment, we ignore the possibility of
2202         *  generation number wraparound.
2203         */
2204         if (seqid != sop->so_seqid)
2205                 goto check_replay;
2206
2207         if (sop->so_confirmed && flags & CONFIRM) {
2208                 dprintk("NFSD: preprocess_seqid_op: expected"
2209                                 " unconfirmed stateowner!\n");
2210                 return nfserr_bad_stateid;
2211         }
2212         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2213                 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2214                                 " confirmed yet!\n");
2215                 return nfserr_bad_stateid;
2216         }
2217         if (stateid->si_generation > stp->st_stateid.si_generation) {
2218                 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
2219                 return nfserr_bad_stateid;
2220         }
2221
2222         if (stateid->si_generation < stp->st_stateid.si_generation) {
2223                 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
2224                 return nfserr_old_stateid;
2225         }
2226         renew_client(sop->so_client);
2227         return nfs_ok;
2228
2229 check_replay:
2230         if (seqid == sop->so_seqid - 1) {
2231                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2232                 /* indicate replay to calling function */
2233                 return nfserr_replay_me;
2234         }
2235         dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2236                         sop->so_seqid, seqid);
2237         *sopp = NULL;
2238         return nfserr_bad_seqid;
2239 }
2240
2241 __be32
2242 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2243                    struct nfsd4_open_confirm *oc)
2244 {
2245         __be32 status;
2246         struct nfs4_stateowner *sop;
2247         struct nfs4_stateid *stp;
2248
2249         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2250                         (int)cstate->current_fh.fh_dentry->d_name.len,
2251                         cstate->current_fh.fh_dentry->d_name.name);
2252
2253         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2254         if (status)
2255                 return status;
2256
2257         nfs4_lock_state();
2258
2259         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2260                                         oc->oc_seqid, &oc->oc_req_stateid,
2261                                         CHECK_FH | CONFIRM | OPEN_STATE,
2262                                         &oc->oc_stateowner, &stp, NULL)))
2263                 goto out;
2264
2265         sop = oc->oc_stateowner;
2266         sop->so_confirmed = 1;
2267         update_stateid(&stp->st_stateid);
2268         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2269         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2270                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2271                          stp->st_stateid.si_boot,
2272                          stp->st_stateid.si_stateownerid,
2273                          stp->st_stateid.si_fileid,
2274                          stp->st_stateid.si_generation);
2275
2276         nfsd4_create_clid_dir(sop->so_client);
2277 out:
2278         if (oc->oc_stateowner) {
2279                 nfs4_get_stateowner(oc->oc_stateowner);
2280                 cstate->replay_owner = oc->oc_stateowner;
2281         }
2282         nfs4_unlock_state();
2283         return status;
2284 }
2285
2286
2287 /*
2288  * unset all bits in union bitmap (bmap) that
2289  * do not exist in share (from successful OPEN_DOWNGRADE)
2290  */
2291 static void
2292 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2293 {
2294         int i;
2295         for (i = 1; i < 4; i++) {
2296                 if ((i & access) != i)
2297                         __clear_bit(i, bmap);
2298         }
2299 }
2300
2301 static void
2302 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2303 {
2304         int i;
2305         for (i = 0; i < 4; i++) {
2306                 if ((i & deny) != i)
2307                         __clear_bit(i, bmap);
2308         }
2309 }
2310
2311 __be32
2312 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2313                      struct nfsd4_compound_state *cstate,
2314                      struct nfsd4_open_downgrade *od)
2315 {
2316         __be32 status;
2317         struct nfs4_stateid *stp;
2318         unsigned int share_access;
2319
2320         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2321                         (int)cstate->current_fh.fh_dentry->d_name.len,
2322                         cstate->current_fh.fh_dentry->d_name.name);
2323
2324         if (!access_valid(od->od_share_access)
2325                         || !deny_valid(od->od_share_deny))
2326                 return nfserr_inval;
2327
2328         nfs4_lock_state();
2329         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2330                                         od->od_seqid,
2331                                         &od->od_stateid,
2332                                         CHECK_FH | OPEN_STATE,
2333                                         &od->od_stateowner, &stp, NULL)))
2334                 goto out;
2335
2336         status = nfserr_inval;
2337         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2338                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2339                         stp->st_access_bmap, od->od_share_access);
2340                 goto out;
2341         }
2342         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2343                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2344                         stp->st_deny_bmap, od->od_share_deny);
2345                 goto out;
2346         }
2347         set_access(&share_access, stp->st_access_bmap);
2348         nfs4_file_downgrade(stp->st_vfs_file,
2349                             share_access & ~od->od_share_access);
2350
2351         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2352         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2353
2354         update_stateid(&stp->st_stateid);
2355         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2356         status = nfs_ok;
2357 out:
2358         if (od->od_stateowner) {
2359                 nfs4_get_stateowner(od->od_stateowner);
2360                 cstate->replay_owner = od->od_stateowner;
2361         }
2362         nfs4_unlock_state();
2363         return status;
2364 }
2365
2366 /*
2367  * nfs4_unlock_state() called after encode
2368  */
2369 __be32
2370 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2371             struct nfsd4_close *close)
2372 {
2373         __be32 status;
2374         struct nfs4_stateid *stp;
2375
2376         dprintk("NFSD: nfsd4_close on file %.*s\n",
2377                         (int)cstate->current_fh.fh_dentry->d_name.len,
2378                         cstate->current_fh.fh_dentry->d_name.name);
2379
2380         nfs4_lock_state();
2381         /* check close_lru for replay */
2382         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2383                                         close->cl_seqid,
2384                                         &close->cl_stateid,
2385                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2386                                         &close->cl_stateowner, &stp, NULL)))
2387                 goto out;
2388         status = nfs_ok;
2389         update_stateid(&stp->st_stateid);
2390         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2391
2392         /* release_stateid() calls nfsd_close() if needed */
2393         release_stateid(stp, OPEN_STATE);
2394
2395         /* place unused nfs4_stateowners on so_close_lru list to be
2396          * released by the laundromat service after the lease period
2397          * to enable us to handle CLOSE replay
2398          */
2399         if (list_empty(&close->cl_stateowner->so_stateids))
2400                 move_to_close_lru(close->cl_stateowner);
2401 out:
2402         if (close->cl_stateowner) {
2403                 nfs4_get_stateowner(close->cl_stateowner);
2404                 cstate->replay_owner = close->cl_stateowner;
2405         }
2406         nfs4_unlock_state();
2407         return status;
2408 }
2409
2410 __be32
2411 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2412                   struct nfsd4_delegreturn *dr)
2413 {
2414         __be32 status;
2415
2416         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2417                 goto out;
2418
2419         nfs4_lock_state();
2420         status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2421                                             &dr->dr_stateid, DELEG_RET, NULL);
2422         nfs4_unlock_state();
2423 out:
2424         return status;
2425 }
2426
2427
2428 /*
2429  * Lock owner state (byte-range locks)
2430  */
2431 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2432 #define LOCK_HASH_BITS              8
2433 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2434 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2435
2436 #define lockownerid_hashval(id) \
2437         ((id) & LOCK_HASH_MASK)
2438
2439 static inline unsigned int
2440 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2441                 struct xdr_netobj *ownername)
2442 {
2443         return (file_hashval(inode) + cl_id
2444                         + opaque_hashval(ownername->data, ownername->len))
2445                 & LOCK_HASH_MASK;
2446 }
2447
2448 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2449 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2450 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2451
2452 static struct nfs4_stateid *
2453 find_stateid(stateid_t *stid, int flags)
2454 {
2455         struct nfs4_stateid *local = NULL;
2456         u32 st_id = stid->si_stateownerid;
2457         u32 f_id = stid->si_fileid;
2458         unsigned int hashval;
2459
2460         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2461         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2462                 hashval = stateid_hashval(st_id, f_id);
2463                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2464                         if ((local->st_stateid.si_stateownerid == st_id) &&
2465                             (local->st_stateid.si_fileid == f_id))
2466                                 return local;
2467                 }
2468         }
2469         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2470                 hashval = stateid_hashval(st_id, f_id);
2471                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2472                         if ((local->st_stateid.si_stateownerid == st_id) &&
2473                             (local->st_stateid.si_fileid == f_id))
2474                                 return local;
2475                 }
2476         }
2477         return NULL;
2478 }
2479
2480 static struct nfs4_delegation *
2481 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2482 {
2483         struct nfs4_file *fp;
2484         struct nfs4_delegation *dl;
2485
2486         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2487                     stid->si_boot, stid->si_stateownerid,
2488                     stid->si_fileid, stid->si_generation);
2489
2490         fp = find_file(ino);
2491         if (!fp)
2492                 return NULL;
2493         dl = find_delegation_file(fp, stid);
2494         put_nfs4_file(fp);
2495         return dl;
2496 }
2497
2498 /*
2499  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2500  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2501  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2502  * locking, this prevents us from being completely protocol-compliant.  The
2503  * real solution to this problem is to start using unsigned file offsets in
2504  * the VFS, but this is a very deep change!
2505  */
2506 static inline void
2507 nfs4_transform_lock_offset(struct file_lock *lock)
2508 {
2509         if (lock->fl_start < 0)
2510                 lock->fl_start = OFFSET_MAX;
2511         if (lock->fl_end < 0)
2512                 lock->fl_end = OFFSET_MAX;
2513 }
2514
2515 /* Hack!: For now, we're defining this just so we can use a pointer to it
2516  * as a unique cookie to identify our (NFSv4's) posix locks. */
2517 static struct lock_manager_operations nfsd_posix_mng_ops  = {
2518 };
2519
2520 static inline void
2521 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2522 {
2523         struct nfs4_stateowner *sop;
2524         unsigned int hval;
2525
2526         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2527                 sop = (struct nfs4_stateowner *) fl->fl_owner;
2528                 hval = lockownerid_hashval(sop->so_id);
2529                 kref_get(&sop->so_ref);
2530                 deny->ld_sop = sop;
2531                 deny->ld_clientid = sop->so_client->cl_clientid;
2532         } else {
2533                 deny->ld_sop = NULL;
2534                 deny->ld_clientid.cl_boot = 0;
2535                 deny->ld_clientid.cl_id = 0;
2536         }
2537         deny->ld_start = fl->fl_start;
2538         deny->ld_length = ~(u64)0;
2539         if (fl->fl_end != ~(u64)0)
2540                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2541         deny->ld_type = NFS4_READ_LT;
2542         if (fl->fl_type != F_RDLCK)
2543                 deny->ld_type = NFS4_WRITE_LT;
2544 }
2545
2546 static struct nfs4_stateowner *
2547 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2548                 struct xdr_netobj *owner)
2549 {
2550         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2551         struct nfs4_stateowner *op;
2552
2553         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2554                 if (same_owner_str(op, owner, clid))
2555                         return op;
2556         }
2557         return NULL;
2558 }
2559
2560 /*
2561  * Alloc a lock owner structure.
2562  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2563  * occured.
2564  *
2565  * strhashval = lock_ownerstr_hashval
2566  */
2567
2568 static struct nfs4_stateowner *
2569 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2570         struct nfs4_stateowner *sop;
2571         struct nfs4_replay *rp;
2572         unsigned int idhashval;
2573
2574         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2575                 return NULL;
2576         idhashval = lockownerid_hashval(current_ownerid);
2577         INIT_LIST_HEAD(&sop->so_idhash);
2578         INIT_LIST_HEAD(&sop->so_strhash);
2579         INIT_LIST_HEAD(&sop->so_perclient);
2580         INIT_LIST_HEAD(&sop->so_stateids);
2581         INIT_LIST_HEAD(&sop->so_perstateid);
2582         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2583         sop->so_time = 0;
2584         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2585         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2586         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2587         sop->so_is_open_owner = 0;
2588         sop->so_id = current_ownerid++;
2589         sop->so_client = clp;
2590         /* It is the openowner seqid that will be incremented in encode in the
2591          * case of new lockowners; so increment the lock seqid manually: */
2592         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2593         sop->so_confirmed = 1;
2594         rp = &sop->so_replay;
2595         rp->rp_status = nfserr_serverfault;
2596         rp->rp_buflen = 0;
2597         rp->rp_buf = rp->rp_ibuf;
2598         return sop;
2599 }
2600
2601 static struct nfs4_stateid *
2602 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2603 {
2604         struct nfs4_stateid *stp;
2605         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2606
2607         stp = nfs4_alloc_stateid();
2608         if (stp == NULL)
2609                 goto out;
2610         INIT_LIST_HEAD(&stp->st_hash);
2611         INIT_LIST_HEAD(&stp->st_perfile);
2612         INIT_LIST_HEAD(&stp->st_perstateowner);
2613         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2614         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2615         list_add(&stp->st_perfile, &fp->fi_stateids);
2616         list_add(&stp->st_perstateowner, &sop->so_stateids);
2617         stp->st_stateowner = sop;
2618         get_nfs4_file(fp);
2619         stp->st_file = fp;
2620         stp->st_stateid.si_boot = boot_time;
2621         stp->st_stateid.si_stateownerid = sop->so_id;
2622         stp->st_stateid.si_fileid = fp->fi_id;
2623         stp->st_stateid.si_generation = 0;
2624         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2625         stp->st_access_bmap = open_stp->st_access_bmap;
2626         stp->st_deny_bmap = open_stp->st_deny_bmap;
2627         stp->st_openstp = open_stp;
2628
2629 out:
2630         return stp;
2631 }
2632
2633 static int
2634 check_lock_length(u64 offset, u64 length)
2635 {
2636         return ((length == 0)  || ((length != ~(u64)0) &&
2637              LOFF_OVERFLOW(offset, length)));
2638 }
2639
2640 /*
2641  *  LOCK operation
2642  */
2643 __be32
2644 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2645            struct nfsd4_lock *lock)
2646 {
2647         struct nfs4_stateowner *open_sop = NULL;
2648         struct nfs4_stateowner *lock_sop = NULL;
2649         struct nfs4_stateid *lock_stp;
2650         struct file *filp;
2651         struct file_lock file_lock;
2652         struct file_lock conflock;
2653         __be32 status = 0;
2654         unsigned int strhashval;
2655         unsigned int cmd;
2656         int err;
2657
2658         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2659                 (long long) lock->lk_offset,
2660                 (long long) lock->lk_length);
2661
2662         if (check_lock_length(lock->lk_offset, lock->lk_length))
2663                  return nfserr_inval;
2664
2665         if ((status = fh_verify(rqstp, &cstate->current_fh,
2666                                 S_IFREG, MAY_LOCK))) {
2667                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2668                 return status;
2669         }
2670
2671         nfs4_lock_state();
2672
2673         if (lock->lk_is_new) {
2674                 /*
2675                  * Client indicates that this is a new lockowner.
2676                  * Use open owner and open stateid to create lock owner and
2677                  * lock stateid.
2678                  */
2679                 struct nfs4_stateid *open_stp = NULL;
2680                 struct nfs4_file *fp;
2681
2682                 status = nfserr_stale_clientid;
2683                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2684                         goto out;
2685
2686                 /* validate and update open stateid and open seqid */
2687                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2688                                         lock->lk_new_open_seqid,
2689                                         &lock->lk_new_open_stateid,
2690                                         CHECK_FH | OPEN_STATE,
2691                                         &lock->lk_replay_owner, &open_stp,
2692                                         lock);
2693                 if (status)
2694                         goto out;
2695                 open_sop = lock->lk_replay_owner;
2696                 /* create lockowner and lock stateid */
2697                 fp = open_stp->st_file;
2698                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2699                                 open_sop->so_client->cl_clientid.cl_id,
2700                                 &lock->v.new.owner);
2701                 /* XXX: Do we need to check for duplicate stateowners on
2702                  * the same file, or should they just be allowed (and
2703                  * create new stateids)? */
2704                 status = nfserr_resource;
2705                 lock_sop = alloc_init_lock_stateowner(strhashval,
2706                                 open_sop->so_client, open_stp, lock);
2707                 if (lock_sop == NULL)
2708                         goto out;
2709                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2710                 if (lock_stp == NULL)
2711                         goto out;
2712         } else {
2713                 /* lock (lock owner + lock stateid) already exists */
2714                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2715                                        lock->lk_old_lock_seqid,
2716                                        &lock->lk_old_lock_stateid,
2717                                        CHECK_FH | LOCK_STATE,
2718                                        &lock->lk_replay_owner, &lock_stp, lock);
2719                 if (status)
2720                         goto out;
2721                 lock_sop = lock->lk_replay_owner;
2722         }
2723         /* lock->lk_replay_owner and lock_stp have been created or found */
2724         filp = lock_stp->st_vfs_file;
2725
2726         status = nfserr_grace;
2727         if (nfs4_in_grace() && !lock->lk_reclaim)
2728                 goto out;
2729         status = nfserr_no_grace;
2730         if (!nfs4_in_grace() && lock->lk_reclaim)
2731                 goto out;
2732
2733         locks_init_lock(&file_lock);
2734         switch (lock->lk_type) {
2735                 case NFS4_READ_LT:
2736                 case NFS4_READW_LT:
2737                         file_lock.fl_type = F_RDLCK;
2738                         cmd = F_SETLK;
2739                 break;
2740                 case NFS4_WRITE_LT:
2741                 case NFS4_WRITEW_LT:
2742                         file_lock.fl_type = F_WRLCK;
2743                         cmd = F_SETLK;
2744                 break;
2745                 default:
2746                         status = nfserr_inval;
2747                 goto out;
2748         }
2749         file_lock.fl_owner = (fl_owner_t)lock_sop;
2750         file_lock.fl_pid = current->tgid;
2751         file_lock.fl_file = filp;
2752         file_lock.fl_flags = FL_POSIX;
2753         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2754
2755         file_lock.fl_start = lock->lk_offset;
2756         if ((lock->lk_length == ~(u64)0) ||
2757                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2758                 file_lock.fl_end = ~(u64)0;
2759         else
2760                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2761         nfs4_transform_lock_offset(&file_lock);
2762
2763         /*
2764         * Try to lock the file in the VFS.
2765         * Note: locks.c uses the BKL to protect the inode's lock list.
2766         */
2767
2768         /* XXX?: Just to divert the locks_release_private at the start of
2769          * locks_copy_lock: */
2770         locks_init_lock(&conflock);
2771         err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2772         switch (-err) {
2773         case 0: /* success! */
2774                 update_stateid(&lock_stp->st_stateid);
2775                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2776                                 sizeof(stateid_t));
2777                 status = 0;
2778                 break;
2779         case (EAGAIN):          /* conflock holds conflicting lock */
2780                 status = nfserr_denied;
2781                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2782                 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2783                 break;
2784         case (EDEADLK):
2785                 status = nfserr_deadlock;
2786                 break;
2787         default:
2788                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2789                 status = nfserr_resource;
2790                 break;
2791         }
2792 out:
2793         if (status && lock->lk_is_new && lock_sop)
2794                 release_stateowner(lock_sop);
2795         if (lock->lk_replay_owner) {
2796                 nfs4_get_stateowner(lock->lk_replay_owner);
2797                 cstate->replay_owner = lock->lk_replay_owner;
2798         }
2799         nfs4_unlock_state();
2800         return status;
2801 }
2802
2803 /*
2804  * LOCKT operation
2805  */
2806 __be32
2807 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2808             struct nfsd4_lockt *lockt)
2809 {
2810         struct inode *inode;
2811         struct file file;
2812         struct file_lock file_lock;
2813         int error;
2814         __be32 status;
2815
2816         if (nfs4_in_grace())
2817                 return nfserr_grace;
2818
2819         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2820                  return nfserr_inval;
2821
2822         lockt->lt_stateowner = NULL;
2823         nfs4_lock_state();
2824
2825         status = nfserr_stale_clientid;
2826         if (STALE_CLIENTID(&lockt->lt_clientid))
2827                 goto out;
2828
2829         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2830                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2831                 if (status == nfserr_symlink)
2832                         status = nfserr_inval;
2833                 goto out;
2834         }
2835
2836         inode = cstate->current_fh.fh_dentry->d_inode;
2837         locks_init_lock(&file_lock);
2838         switch (lockt->lt_type) {
2839                 case NFS4_READ_LT:
2840                 case NFS4_READW_LT:
2841                         file_lock.fl_type = F_RDLCK;
2842                 break;
2843                 case NFS4_WRITE_LT:
2844                 case NFS4_WRITEW_LT:
2845                         file_lock.fl_type = F_WRLCK;
2846                 break;
2847                 default:
2848                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2849                         status = nfserr_inval;
2850                 goto out;
2851         }
2852
2853         lockt->lt_stateowner = find_lockstateowner_str(inode,
2854                         &lockt->lt_clientid, &lockt->lt_owner);
2855         if (lockt->lt_stateowner)
2856                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2857         file_lock.fl_pid = current->tgid;
2858         file_lock.fl_flags = FL_POSIX;
2859         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2860
2861         file_lock.fl_start = lockt->lt_offset;
2862         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2863                 file_lock.fl_end = ~(u64)0;
2864         else
2865                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2866
2867         nfs4_transform_lock_offset(&file_lock);
2868
2869         /* vfs_test_lock uses the struct file _only_ to resolve the inode.
2870          * since LOCKT doesn't require an OPEN, and therefore a struct
2871          * file may not exist, pass vfs_test_lock a struct file with
2872          * only the dentry:inode set.
2873          */
2874         memset(&file, 0, sizeof (struct file));
2875         file.f_path.dentry = cstate->current_fh.fh_dentry;
2876
2877         status = nfs_ok;
2878         error = vfs_test_lock(&file, &file_lock);
2879         if (error) {
2880                 status = nfserrno(error);
2881                 goto out;
2882         }
2883         if (file_lock.fl_type != F_UNLCK) {
2884                 status = nfserr_denied;
2885                 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2886         }
2887 out:
2888         nfs4_unlock_state();
2889         return status;
2890 }
2891
2892 __be32
2893 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2894             struct nfsd4_locku *locku)
2895 {
2896         struct nfs4_stateid *stp;
2897         struct file *filp = NULL;
2898         struct file_lock file_lock;
2899         __be32 status;
2900         int err;
2901
2902         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2903                 (long long) locku->lu_offset,
2904                 (long long) locku->lu_length);
2905
2906         if (check_lock_length(locku->lu_offset, locku->lu_length))
2907                  return nfserr_inval;
2908
2909         nfs4_lock_state();
2910
2911         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2912                                         locku->lu_seqid,
2913                                         &locku->lu_stateid,
2914                                         CHECK_FH | LOCK_STATE,
2915                                         &locku->lu_stateowner, &stp, NULL)))
2916                 goto out;
2917
2918         filp = stp->st_vfs_file;
2919         BUG_ON(!filp);
2920         locks_init_lock(&file_lock);
2921         file_lock.fl_type = F_UNLCK;
2922         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2923         file_lock.fl_pid = current->tgid;
2924         file_lock.fl_file = filp;
2925         file_lock.fl_flags = FL_POSIX;
2926         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2927         file_lock.fl_start = locku->lu_offset;
2928
2929         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2930                 file_lock.fl_end = ~(u64)0;
2931         else
2932                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2933         nfs4_transform_lock_offset(&file_lock);
2934
2935         /*
2936         *  Try to unlock the file in the VFS.
2937         */
2938         err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2939         if (err) {
2940                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2941                 goto out_nfserr;
2942         }
2943         /*
2944         * OK, unlock succeeded; the only thing left to do is update the stateid.
2945         */
2946         update_stateid(&stp->st_stateid);
2947         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2948
2949 out:
2950         if (locku->lu_stateowner) {
2951                 nfs4_get_stateowner(locku->lu_stateowner);
2952                 cstate->replay_owner = locku->lu_stateowner;
2953         }
2954         nfs4_unlock_state();
2955         return status;
2956
2957 out_nfserr:
2958         status = nfserrno(err);
2959         goto out;
2960 }
2961
2962 /*
2963  * returns
2964  *      1: locks held by lockowner
2965  *      0: no locks held by lockowner
2966  */
2967 static int
2968 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2969 {
2970         struct file_lock **flpp;
2971         struct inode *inode = filp->f_path.dentry->d_inode;
2972         int status = 0;
2973
2974         lock_kernel();
2975         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2976                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2977                         status = 1;
2978                         goto out;
2979                 }
2980         }
2981 out:
2982         unlock_kernel();
2983         return status;
2984 }
2985
2986 __be32
2987 nfsd4_release_lockowner(struct svc_rqst *rqstp,
2988                         struct nfsd4_compound_state *cstate,
2989                         struct nfsd4_release_lockowner *rlockowner)
2990 {
2991         clientid_t *clid = &rlockowner->rl_clientid;
2992         struct nfs4_stateowner *sop;
2993         struct nfs4_stateid *stp;
2994         struct xdr_netobj *owner = &rlockowner->rl_owner;
2995         struct list_head matches;
2996         int i;
2997         __be32 status;
2998
2999         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3000                 clid->cl_boot, clid->cl_id);
3001
3002         /* XXX check for lease expiration */
3003
3004         status = nfserr_stale_clientid;
3005         if (STALE_CLIENTID(clid))
3006                 return status;
3007
3008         nfs4_lock_state();
3009
3010         status = nfserr_locks_held;
3011         /* XXX: we're doing a linear search through all the lockowners.
3012          * Yipes!  For now we'll just hope clients aren't really using
3013          * release_lockowner much, but eventually we have to fix these
3014          * data structures. */
3015         INIT_LIST_HEAD(&matches);
3016         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3017                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3018                         if (!same_owner_str(sop, owner, clid))
3019                                 continue;
3020                         list_for_each_entry(stp, &sop->so_stateids,
3021                                         st_perstateowner) {
3022                                 if (check_for_locks(stp->st_vfs_file, sop))
3023                                         goto out;
3024                                 /* Note: so_perclient unused for lockowners,
3025                                  * so it's OK to fool with here. */
3026                                 list_add(&sop->so_perclient, &matches);
3027                         }
3028                 }
3029         }
3030         /* Clients probably won't expect us to return with some (but not all)
3031          * of the lockowner state released; so don't release any until all
3032          * have been checked. */
3033         status = nfs_ok;
3034         while (!list_empty(&matches)) {
3035                 sop = list_entry(matches.next, struct nfs4_stateowner,
3036                                                                 so_perclient);
3037                 /* unhash_stateowner deletes so_perclient only
3038                  * for openowners. */
3039                 list_del(&sop->so_perclient);
3040                 release_stateowner(sop);
3041         }
3042 out:
3043         nfs4_unlock_state();
3044         return status;
3045 }
3046
3047 static inline struct nfs4_client_reclaim *
3048 alloc_reclaim(void)
3049 {
3050         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3051 }
3052
3053 int
3054 nfs4_has_reclaimed_state(const char *name)
3055 {
3056         unsigned int strhashval = clientstr_hashval(name);
3057         struct nfs4_client *clp;
3058
3059         clp = find_confirmed_client_by_str(name, strhashval);
3060         return clp ? 1 : 0;
3061 }
3062
3063 /*
3064  * failure => all reset bets are off, nfserr_no_grace...
3065  */
3066 int
3067 nfs4_client_to_reclaim(const char *name)
3068 {
3069         unsigned int strhashval;
3070         struct nfs4_client_reclaim *crp = NULL;
3071
3072         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3073         crp = alloc_reclaim();
3074         if (!crp)
3075                 return 0;
3076         strhashval = clientstr_hashval(name);
3077         INIT_LIST_HEAD(&crp->cr_strhash);
3078         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3079         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3080         reclaim_str_hashtbl_size++;
3081         return 1;
3082 }
3083
3084 static void
3085 nfs4_release_reclaim(void)
3086 {
3087         struct nfs4_client_reclaim *crp = NULL;
3088         int i;
3089
3090         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3091                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3092                         crp = list_entry(reclaim_str_hashtbl[i].next,
3093                                         struct nfs4_client_reclaim, cr_strhash);
3094                         list_del(&crp->cr_strhash);
3095                         kfree(crp);
3096                         reclaim_str_hashtbl_size--;
3097                 }
3098         }
3099         BUG_ON(reclaim_str_hashtbl_size);
3100 }
3101
3102 /*
3103  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3104 static struct nfs4_client_reclaim *
3105 nfs4_find_reclaim_client(clientid_t *clid)
3106 {
3107         unsigned int strhashval;
3108         struct nfs4_client *clp;
3109         struct nfs4_client_reclaim *crp = NULL;
3110
3111
3112         /* find clientid in conf_id_hashtbl */
3113         clp = find_confirmed_client(clid);
3114         if (clp == NULL)
3115                 return NULL;
3116
3117         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3118                             clp->cl_name.len, clp->cl_name.data,
3119                             clp->cl_recdir);
3120
3121         /* find clp->cl_name in reclaim_str_hashtbl */
3122         strhashval = clientstr_hashval(clp->cl_recdir);
3123         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3124                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3125                         return crp;
3126                 }
3127         }
3128         return NULL;
3129 }
3130
3131 /*
3132 * Called from OPEN. Look for clientid in reclaim list.
3133 */
3134 __be32
3135 nfs4_check_open_reclaim(clientid_t *clid)
3136 {
3137         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3138 }
3139
3140 /* initialization to perform at module load time: */
3141
3142 int
3143 nfs4_state_init(void)
3144 {
3145         int i, status;
3146
3147         status = nfsd4_init_slabs();
3148         if (status)
3149                 return status;
3150         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3151                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3152                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3153                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3154                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3155         }
3156         for (i = 0; i < FILE_HASH_SIZE; i++) {
3157                 INIT_LIST_HEAD(&file_hashtbl[i]);
3158         }
3159         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3160                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3161                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3162         }
3163         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3164                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3165                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3166         }
3167         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3168                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3169                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3170         }
3171         memset(&onestateid, ~0, sizeof(stateid_t));
3172         INIT_LIST_HEAD(&close_lru);
3173         INIT_LIST_HEAD(&client_lru);
3174         INIT_LIST_HEAD(&del_recall_lru);
3175         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3176                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3177         reclaim_str_hashtbl_size = 0;
3178         return 0;
3179 }
3180
3181 static void
3182 nfsd4_load_reboot_recovery_data(void)
3183 {
3184         int status;
3185
3186         nfs4_lock_state();
3187         nfsd4_init_recdir(user_recovery_dirname);
3188         status = nfsd4_recdir_load();
3189         nfs4_unlock_state();
3190         if (status)
3191                 printk("NFSD: Failure reading reboot recovery data\n");
3192 }
3193
3194 unsigned long
3195 get_nfs4_grace_period(void)
3196 {
3197         return max(user_lease_time, lease_time) * HZ;
3198 }
3199
3200 /*
3201  * Since the lifetime of a delegation isn't limited to that of an open, a
3202  * client may quite reasonably hang on to a delegation as long as it has
3203  * the inode cached.  This becomes an obvious problem the first time a
3204  * client's inode cache approaches the size of the server's total memory.
3205  *
3206  * For now we avoid this problem by imposing a hard limit on the number
3207  * of delegations, which varies according to the server's memory size.
3208  */
3209 static void
3210 set_max_delegations(void)
3211 {
3212         /*
3213          * Allow at most 4 delegations per megabyte of RAM.  Quick
3214          * estimates suggest that in the worst case (where every delegation
3215          * is for a different inode), a delegation could take about 1.5K,
3216          * giving a worst case usage of about 6% of memory.
3217          */
3218         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3219 }
3220
3221 /* initialization to perform when the nfsd service is started: */
3222
3223 static void
3224 __nfs4_state_start(void)
3225 {
3226         unsigned long grace_time;
3227
3228         boot_time = get_seconds();
3229         grace_time = get_nfs_grace_period();
3230         lease_time = user_lease_time;
3231         in_grace = 1;
3232         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3233                grace_time/HZ);
3234         laundry_wq = create_singlethread_workqueue("nfsd4");
3235         queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3236         set_max_delegations();
3237 }
3238
3239 void
3240 nfs4_state_start(void)
3241 {
3242         if (nfs4_init)
3243                 return;
3244         nfsd4_load_reboot_recovery_data();
3245         __nfs4_state_start();
3246         nfs4_init = 1;
3247         return;
3248 }
3249
3250 int
3251 nfs4_in_grace(void)
3252 {
3253         return in_grace;
3254 }
3255
3256 time_t
3257 nfs4_lease_time(void)
3258 {
3259         return lease_time;
3260 }
3261
3262 static void
3263 __nfs4_state_shutdown(void)
3264 {
3265         int i;
3266         struct nfs4_client *clp = NULL;
3267         struct nfs4_delegation *dp = NULL;
3268         struct list_head *pos, *next, reaplist;
3269
3270         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3271                 while (!list_empty(&conf_id_hashtbl[i])) {
3272                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3273                         expire_client(clp);
3274                 }
3275                 while (!list_empty(&unconf_str_hashtbl[i])) {
3276                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3277                         expire_client(clp);
3278                 }
3279         }
3280         INIT_LIST_HEAD(&reaplist);
3281         spin_lock(&recall_lock);
3282         list_for_each_safe(pos, next, &del_recall_lru) {
3283                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3284                 list_move(&dp->dl_recall_lru, &reaplist);
3285         }
3286         spin_unlock(&recall_lock);
3287         list_for_each_safe(pos, next, &reaplist) {
3288                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3289                 list_del_init(&dp->dl_recall_lru);
3290                 unhash_delegation(dp);
3291         }
3292
3293         nfsd4_shutdown_recdir();
3294         nfs4_init = 0;
3295 }
3296
3297 void
3298 nfs4_state_shutdown(void)
3299 {
3300         cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3301         destroy_workqueue(laundry_wq);
3302         nfs4_lock_state();
3303         nfs4_release_reclaim();
3304         __nfs4_state_shutdown();
3305         nfs4_unlock_state();
3306 }
3307
3308 static void
3309 nfs4_set_recdir(char *recdir)
3310 {
3311         nfs4_lock_state();
3312         strcpy(user_recovery_dirname, recdir);
3313         nfs4_unlock_state();
3314 }
3315
3316 /*
3317  * Change the NFSv4 recovery directory to recdir.
3318  */
3319 int
3320 nfs4_reset_recoverydir(char *recdir)
3321 {
3322         int status;
3323         struct nameidata nd;
3324
3325         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3326         if (status)
3327                 return status;
3328         status = -ENOTDIR;
3329         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3330                 nfs4_set_recdir(recdir);
3331                 status = 0;
3332         }
3333         path_release(&nd);
3334         return status;
3335 }
3336
3337 /*
3338  * Called when leasetime is changed.
3339  *
3340  * The only way the protocol gives us to handle on-the-fly lease changes is to
3341  * simulate a reboot.  Instead of doing that, we just wait till the next time
3342  * we start to register any changes in lease time.  If the administrator
3343  * really wants to change the lease time *now*, they can go ahead and bring
3344  * nfsd down and then back up again after changing the lease time.
3345  */
3346 void
3347 nfs4_reset_lease(time_t leasetime)
3348 {
3349         lock_kernel();
3350         user_lease_time = leasetime;
3351         unlock_kernel();
3352 }