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   1 /*
   2 *  linux/fs/nfsd/nfs4state.c
   3 *
   4 *  Copyright (c) 2001 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson <kandros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 */
  36
  37 #include <linux/param.h>
  38 #include <linux/major.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/sunrpc/svc.h>
  42 #include <linux/nfsd/nfsd.h>
  43 #include <linux/nfsd/cache.h>
  44 #include <linux/mount.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/kthread.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfsd/state.h>
  50 #include <linux/nfsd/xdr4.h>
  51 #include <linux/namei.h>
  52 #include <linux/mutex.h>
  53
  54 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  55
  56 /* Globals */
  57 static time_t lease_time = 90;     /* default lease time */
  58 static time_t user_lease_time = 90;
  59 static time_t boot_time;
  60 static int in_grace = 1;
  61 static u32 current_clientid = 1;
  62 static u32 current_ownerid = 1;
  63 static u32 current_fileid = 1;
  64 static u32 current_delegid = 1;
  65 static u32 nfs4_init;
  66 static stateid_t zerostateid;             /* bits all 0 */
  67 static stateid_t onestateid;              /* bits all 1 */
  68
  69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
  70 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
  71
  72 /* forward declarations */
  73 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  74 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  75 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  76 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
  77 static void nfs4_set_recdir(char *recdir);
  78
  79 /* Locking:
  80  *
  81  * client_mutex:
  82  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  83  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  84  */
  85 static DEFINE_MUTEX(client_mutex);
  86
  87 static struct kmem_cache *stateowner_slab = NULL;
  88 static struct kmem_cache *file_slab = NULL;
  89 static struct kmem_cache *stateid_slab = NULL;
  90 static struct kmem_cache *deleg_slab = NULL;
  91
  92 void
  93 nfs4_lock_state(void)
  94 {
  95         mutex_lock(&client_mutex);
  96 }
  97
  98 void
  99 nfs4_unlock_state(void)
 100 {
 101         mutex_unlock(&client_mutex);
 102 }
 103
 104 static inline u32
 105 opaque_hashval(const void *ptr, int nbytes)
 106 {
 107         unsigned char *cptr = (unsigned char *) ptr;
 108
 109         u32 x = 0;
 110         while (nbytes--) {
 111                 x *= 37;
 112                 x += *cptr++;
 113         }
 114         return x;
 115 }
 116
 117 /* forward declarations */
 118 static void release_stateowner(struct nfs4_stateowner *sop);
 119 static void release_stateid(struct nfs4_stateid *stp, int flags);
 120
 121 /*
 122  * Delegation state
 123  */
 124
 125 /* recall_lock protects the del_recall_lru */
 126 static DEFINE_SPINLOCK(recall_lock);
 127 static struct list_head del_recall_lru;
 128
 129 static void
 130 free_nfs4_file(struct kref *kref)
 131 {
 132         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 133         list_del(&fp->fi_hash);
 134         iput(fp->fi_inode);
 135         kmem_cache_free(file_slab, fp);
 136 }
 137
 138 static inline void
 139 put_nfs4_file(struct nfs4_file *fi)
 140 {
 141         kref_put(&fi->fi_ref, free_nfs4_file);
 142 }
 143
 144 static inline void
 145 get_nfs4_file(struct nfs4_file *fi)
 146 {
 147         kref_get(&fi->fi_ref);
 148 }
 149
 150 static int num_delegations;
 151
 152 /*
 153  * Open owner state (share locks)
 154  */
 155
 156 /* hash tables for nfs4_stateowner */
 157 #define OWNER_HASH_BITS              8
 158 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 159 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 160
 161 #define ownerid_hashval(id) \
 162         ((id) & OWNER_HASH_MASK)
 163 #define ownerstr_hashval(clientid, ownername) \
 164         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 165
 166 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 167 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 168
 169 /* hash table for nfs4_file */
 170 #define FILE_HASH_BITS                   8
 171 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 172 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 173 /* hash table for (open)nfs4_stateid */
 174 #define STATEID_HASH_BITS              10
 175 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 176 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 177
 178 #define file_hashval(x) \
 179         hash_ptr(x, FILE_HASH_BITS)
 180 #define stateid_hashval(owner_id, file_id)  \
 181         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 182
 183 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 184 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 185
 186 static struct nfs4_delegation *
 187 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 188 {
 189         struct nfs4_delegation *dp;
 190         struct nfs4_file *fp = stp->st_file;
 191         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 192
 193         dprintk("NFSD alloc_init_deleg\n");
 194         if (num_delegations > STATEID_HASH_SIZE * 4)
 195                 return NULL;
 196         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 197         if (dp == NULL)
 198                 return dp;
 199         num_delegations++;
 200         INIT_LIST_HEAD(&dp->dl_perfile);
 201         INIT_LIST_HEAD(&dp->dl_perclnt);
 202         INIT_LIST_HEAD(&dp->dl_recall_lru);
 203         dp->dl_client = clp;
 204         get_nfs4_file(fp);
 205         dp->dl_file = fp;
 206         dp->dl_flock = NULL;
 207         get_file(stp->st_vfs_file);
 208         dp->dl_vfs_file = stp->st_vfs_file;
 209         dp->dl_type = type;
 210         dp->dl_recall.cbr_dp = NULL;
 211         dp->dl_recall.cbr_ident = cb->cb_ident;
 212         dp->dl_recall.cbr_trunc = 0;
 213         dp->dl_stateid.si_boot = boot_time;
 214         dp->dl_stateid.si_stateownerid = current_delegid++;
 215         dp->dl_stateid.si_fileid = 0;
 216         dp->dl_stateid.si_generation = 0;
 217         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 218         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 219                         current_fh->fh_handle.fh_size);
 220         dp->dl_time = 0;
 221         atomic_set(&dp->dl_count, 1);
 222         list_add(&dp->dl_perfile, &fp->fi_delegations);
 223         list_add(&dp->dl_perclnt, &clp->cl_delegations);
 224         return dp;
 225 }
 226
 227 void
 228 nfs4_put_delegation(struct nfs4_delegation *dp)
 229 {
 230         if (atomic_dec_and_test(&dp->dl_count)) {
 231                 dprintk("NFSD: freeing dp %p\n",dp);
 232                 put_nfs4_file(dp->dl_file);
 233                 kmem_cache_free(deleg_slab, dp);
 234                 num_delegations--;
 235         }
 236 }
 237
 238 /* Remove the associated file_lock first, then remove the delegation.
 239  * lease_modify() is called to remove the FS_LEASE file_lock from
 240  * the i_flock list, eventually calling nfsd's lock_manager
 241  * fl_release_callback.
 242  */
 243 static void
 244 nfs4_close_delegation(struct nfs4_delegation *dp)
 245 {
 246         struct file *filp = dp->dl_vfs_file;
 247
 248         dprintk("NFSD: close_delegation dp %p\n",dp);
 249         dp->dl_vfs_file = NULL;
 250         /* The following nfsd_close may not actually close the file,
 251          * but we want to remove the lease in any case. */
 252         if (dp->dl_flock)
 253                 setlease(filp, F_UNLCK, &dp->dl_flock);
 254         nfsd_close(filp);
 255 }
 256
 257 /* Called under the state lock. */
 258 static void
 259 unhash_delegation(struct nfs4_delegation *dp)
 260 {
 261         list_del_init(&dp->dl_perfile);
 262         list_del_init(&dp->dl_perclnt);
 263         spin_lock(&recall_lock);
 264         list_del_init(&dp->dl_recall_lru);
 265         spin_unlock(&recall_lock);
 266         nfs4_close_delegation(dp);
 267         nfs4_put_delegation(dp);
 268 }
 269
 270 /*
 271  * SETCLIENTID state
 272  */
 273
 274 /* Hash tables for nfs4_clientid state */
 275 #define CLIENT_HASH_BITS                 4
 276 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 277 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 278
 279 #define clientid_hashval(id) \
 280         ((id) & CLIENT_HASH_MASK)
 281 #define clientstr_hashval(name) \
 282         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
 283 /*
 284  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 285  * used in reboot/reset lease grace period processing
 286  *
 287  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 288  * setclientid_confirmed info.
 289  *
 290  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 291  * setclientid info.
 292  *
 293  * client_lru holds client queue ordered by nfs4_client.cl_time
 294  * for lease renewal.
 295  *
 296  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 297  * for last close replay.
 298  */
 299 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 300 static int reclaim_str_hashtbl_size = 0;
 301 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 302 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 303 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 304 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 305 static struct list_head client_lru;
 306 static struct list_head close_lru;
 307
 308 static inline void
 309 renew_client(struct nfs4_client *clp)
 310 {
 311         /*
 312         * Move client to the end to the LRU list.
 313         */
 314         dprintk("renewing client (clientid %08x/%08x)\n",
 315                         clp->cl_clientid.cl_boot,
 316                         clp->cl_clientid.cl_id);
 317         list_move_tail(&clp->cl_lru, &client_lru);
 318         clp->cl_time = get_seconds();
 319 }
 320
 321 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 322 static int
 323 STALE_CLIENTID(clientid_t *clid)
 324 {
 325         if (clid->cl_boot == boot_time)
 326                 return 0;
 327         dprintk("NFSD stale clientid (%08x/%08x)\n",
 328                         clid->cl_boot, clid->cl_id);
 329         return 1;
 330 }
 331
 332 /*
 333  * XXX Should we use a slab cache ?
 334  * This type of memory management is somewhat inefficient, but we use it
 335  * anyway since SETCLIENTID is not a common operation.
 336  */
 337 static inline struct nfs4_client *
 338 alloc_client(struct xdr_netobj name)
 339 {
 340         struct nfs4_client *clp;
 341
 342         if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 343                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 344                         memcpy(clp->cl_name.data, name.data, name.len);
 345                         clp->cl_name.len = name.len;
 346                 }
 347                 else {
 348                         kfree(clp);
 349                         clp = NULL;
 350                 }
 351         }
 352         return clp;
 353 }
 354
 355 static inline void
 356 free_client(struct nfs4_client *clp)
 357 {
 358         if (clp->cl_cred.cr_group_info)
 359                 put_group_info(clp->cl_cred.cr_group_info);
 360         kfree(clp->cl_name.data);
 361         kfree(clp);
 362 }
 363
 364 void
 365 put_nfs4_client(struct nfs4_client *clp)
 366 {
 367         if (atomic_dec_and_test(&clp->cl_count))
 368                 free_client(clp);
 369 }
 370
 371 static void
 372 shutdown_callback_client(struct nfs4_client *clp)
 373 {
 374         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 375
 376         /* shutdown rpc client, ending any outstanding recall rpcs */
 377         if (clnt) {
 378                 clp->cl_callback.cb_client = NULL;
 379                 rpc_shutdown_client(clnt);
 380                 rpciod_down();
 381         }
 382 }
 383
 384 static void
 385 expire_client(struct nfs4_client *clp)
 386 {
 387         struct nfs4_stateowner *sop;
 388         struct nfs4_delegation *dp;
 389         struct list_head reaplist;
 390
 391         dprintk("NFSD: expire_client cl_count %d\n",
 392                             atomic_read(&clp->cl_count));
 393
 394         shutdown_callback_client(clp);
 395
 396         INIT_LIST_HEAD(&reaplist);
 397         spin_lock(&recall_lock);
 398         while (!list_empty(&clp->cl_delegations)) {
 399                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
 400                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 401                                 dp->dl_flock);
 402                 list_del_init(&dp->dl_perclnt);
 403                 list_move(&dp->dl_recall_lru, &reaplist);
 404         }
 405         spin_unlock(&recall_lock);
 406         while (!list_empty(&reaplist)) {
 407                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 408                 list_del_init(&dp->dl_recall_lru);
 409                 unhash_delegation(dp);
 410         }
 411         list_del(&clp->cl_idhash);
 412         list_del(&clp->cl_strhash);
 413         list_del(&clp->cl_lru);
 414         while (!list_empty(&clp->cl_openowners)) {
 415                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
 416                 release_stateowner(sop);
 417         }
 418         put_nfs4_client(clp);
 419 }
 420
 421 static struct nfs4_client *
 422 create_client(struct xdr_netobj name, char *recdir) {
 423         struct nfs4_client *clp;
 424
 425         if (!(clp = alloc_client(name)))
 426                 goto out;
 427         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 428         atomic_set(&clp->cl_count, 1);
 429         atomic_set(&clp->cl_callback.cb_set, 0);
 430         INIT_LIST_HEAD(&clp->cl_idhash);
 431         INIT_LIST_HEAD(&clp->cl_strhash);
 432         INIT_LIST_HEAD(&clp->cl_openowners);
 433         INIT_LIST_HEAD(&clp->cl_delegations);
 434         INIT_LIST_HEAD(&clp->cl_lru);
 435 out:
 436         return clp;
 437 }
 438
 439 static void
 440 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 441         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 442 }
 443
 444 static void
 445 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 446         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 447         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 448 }
 449
 450 static void
 451 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 452
 453         target->cr_uid = source->cr_uid;
 454         target->cr_gid = source->cr_gid;
 455         target->cr_group_info = source->cr_group_info;
 456         get_group_info(target->cr_group_info);
 457 }
 458
 459 static inline int
 460 same_name(const char *n1, const char *n2) {
 461         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 462 }
 463
 464 static int
 465 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 466         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 467 }
 468
 469 static int
 470 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 471         return((cl1->cl_boot == cl2->cl_boot) &&
 472                 (cl1->cl_id == cl2->cl_id));
 473 }
 474
 475 /* XXX what about NGROUP */
 476 static int
 477 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 478         return(cr1->cr_uid == cr2->cr_uid);
 479
 480 }
 481
 482 static void
 483 gen_clid(struct nfs4_client *clp) {
 484         clp->cl_clientid.cl_boot = boot_time;
 485         clp->cl_clientid.cl_id = current_clientid++;
 486 }
 487
 488 static void
 489 gen_confirm(struct nfs4_client *clp) {
 490         struct timespec         tv;
 491         u32 *                   p;
 492
 493         tv = CURRENT_TIME;
 494         p = (u32 *)clp->cl_confirm.data;
 495         *p++ = tv.tv_sec;
 496         *p++ = tv.tv_nsec;
 497 }
 498
 499 static int
 500 check_name(struct xdr_netobj name) {
 501
 502         if (name.len == 0)
 503                 return 0;
 504         if (name.len > NFS4_OPAQUE_LIMIT) {
 505                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 506                 return 0;
 507         }
 508         return 1;
 509 }
 510
 511 static void
 512 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 513 {
 514         unsigned int idhashval;
 515
 516         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 517         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 518         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 519         list_add_tail(&clp->cl_lru, &client_lru);
 520         clp->cl_time = get_seconds();
 521 }
 522
 523 static void
 524 move_to_confirmed(struct nfs4_client *clp)
 525 {
 526         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 527         unsigned int strhashval;
 528
 529         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 530         list_del_init(&clp->cl_strhash);
 531         list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 532         strhashval = clientstr_hashval(clp->cl_recdir);
 533         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 534         renew_client(clp);
 535 }
 536
 537 static struct nfs4_client *
 538 find_confirmed_client(clientid_t *clid)
 539 {
 540         struct nfs4_client *clp;
 541         unsigned int idhashval = clientid_hashval(clid->cl_id);
 542
 543         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 544                 if (cmp_clid(&clp->cl_clientid, clid))
 545                         return clp;
 546         }
 547         return NULL;
 548 }
 549
 550 static struct nfs4_client *
 551 find_unconfirmed_client(clientid_t *clid)
 552 {
 553         struct nfs4_client *clp;
 554         unsigned int idhashval = clientid_hashval(clid->cl_id);
 555
 556         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 557                 if (cmp_clid(&clp->cl_clientid, clid))
 558                         return clp;
 559         }
 560         return NULL;
 561 }
 562
 563 static struct nfs4_client *
 564 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 565 {
 566         struct nfs4_client *clp;
 567
 568         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 569                 if (same_name(clp->cl_recdir, dname))
 570                         return clp;
 571         }
 572         return NULL;
 573 }
 574
 575 static struct nfs4_client *
 576 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 577 {
 578         struct nfs4_client *clp;
 579
 580         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 581                 if (same_name(clp->cl_recdir, dname))
 582                         return clp;
 583         }
 584         return NULL;
 585 }
 586
 587 /* a helper function for parse_callback */
 588 static int
 589 parse_octet(unsigned int *lenp, char **addrp)
 590 {
 591         unsigned int len = *lenp;
 592         char *p = *addrp;
 593         int n = -1;
 594         char c;
 595
 596         for (;;) {
 597                 if (!len)
 598                         break;
 599                 len--;
 600                 c = *p++;
 601                 if (c == '.')
 602                         break;
 603                 if ((c < '0') || (c > '9')) {
 604                         n = -1;
 605                         break;
 606                 }
 607                 if (n < 0)
 608                         n = 0;
 609                 n = (n * 10) + (c - '0');
 610                 if (n > 255) {
 611                         n = -1;
 612                         break;
 613                 }
 614         }
 615         *lenp = len;
 616         *addrp = p;
 617         return n;
 618 }
 619
 620 /* parse and set the setclientid ipv4 callback address */
 621 static int
 622 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 623 {
 624         int temp = 0;
 625         u32 cbaddr = 0;
 626         u16 cbport = 0;
 627         u32 addrlen = addr_len;
 628         char *addr = addr_val;
 629         int i, shift;
 630
 631         /* ipaddress */
 632         shift = 24;
 633         for(i = 4; i > 0  ; i--) {
 634                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 635                         return 0;
 636                 }
 637                 cbaddr |= (temp << shift);
 638                 if (shift > 0)
 639                 shift -= 8;
 640         }
 641         *cbaddrp = cbaddr;
 642
 643         /* port */
 644         shift = 8;
 645         for(i = 2; i > 0  ; i--) {
 646                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 647                         return 0;
 648                 }
 649                 cbport |= (temp << shift);
 650                 if (shift > 0)
 651                         shift -= 8;
 652         }
 653         *cbportp = cbport;
 654         return 1;
 655 }
 656
 657 static void
 658 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 659 {
 660         struct nfs4_callback *cb = &clp->cl_callback;
 661
 662         /* Currently, we only support tcp for the callback channel */
 663         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 664                 goto out_err;
 665
 666         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 667                          &cb->cb_addr, &cb->cb_port)))
 668                 goto out_err;
 669         cb->cb_prog = se->se_callback_prog;
 670         cb->cb_ident = se->se_callback_ident;
 671         return;
 672 out_err:
 673         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 674                 "will not receive delegations\n",
 675                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 676
 677         return;
 678 }
 679
 680 /*
 681  * RFC 3010 has a complex implmentation description of processing a
 682  * SETCLIENTID request consisting of 5 bullets, labeled as
 683  * CASE0 - CASE4 below.
 684  *
 685  * NOTES:
 686  *      callback information will be processed in a future patch
 687  *
 688  *      an unconfirmed record is added when:
 689  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 690  *      CASE 1: confirmed record found with matching name, principal,
 691  *              verifier, and clientid.
 692  *      CASE 2: confirmed record found with matching name, principal,
 693  *              and there is no unconfirmed record with matching
 694  *              name and principal
 695  *
 696  *      an unconfirmed record is replaced when:
 697  *      CASE 3: confirmed record found with matching name, principal,
 698  *              and an unconfirmed record is found with matching
 699  *              name, principal, and with clientid and
 700  *              confirm that does not match the confirmed record.
 701  *      CASE 4: there is no confirmed record with matching name and
 702  *              principal. there is an unconfirmed record with
 703  *              matching name, principal.
 704  *
 705  *      an unconfirmed record is deleted when:
 706  *      CASE 1: an unconfirmed record that matches input name, verifier,
 707  *              and confirmed clientid.
 708  *      CASE 4: any unconfirmed records with matching name and principal
 709  *              that exist after an unconfirmed record has been replaced
 710  *              as described above.
 711  *
 712  */
 713 __be32
 714 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 715                   struct nfsd4_setclientid *setclid)
 716 {
 717         __be32                  ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 718         struct xdr_netobj       clname = {
 719                 .len = setclid->se_namelen,
 720                 .data = setclid->se_name,
 721         };
 722         nfs4_verifier           clverifier = setclid->se_verf;
 723         unsigned int            strhashval;
 724         struct nfs4_client      *conf, *unconf, *new;
 725         __be32                  status;
 726         char                    dname[HEXDIR_LEN];
 727
 728         if (!check_name(clname))
 729                 return nfserr_inval;
 730
 731         status = nfs4_make_rec_clidname(dname, &clname);
 732         if (status)
 733                 return status;
 734
 735         /*
 736          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 737          * We get here on a DRC miss.
 738          */
 739
 740         strhashval = clientstr_hashval(dname);
 741
 742         nfs4_lock_state();
 743         conf = find_confirmed_client_by_str(dname, strhashval);
 744         if (conf) {
 745                 /*
 746                  * CASE 0:
 747                  * clname match, confirmed, different principal
 748                  * or different ip_address
 749                  */
 750                 status = nfserr_clid_inuse;
 751                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
 752                                 || conf->cl_addr != ip_addr) {
 753                         printk("NFSD: setclientid: string in use by client"
 754                         "(clientid %08x/%08x)\n",
 755                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
 756                         goto out;
 757                 }
 758         }
 759         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 760         status = nfserr_resource;
 761         if (!conf) {
 762                 /*
 763                  * CASE 4:
 764                  * placed first, because it is the normal case.
 765                  */
 766                 if (unconf)
 767                         expire_client(unconf);
 768                 new = create_client(clname, dname);
 769                 if (new == NULL)
 770                         goto out;
 771                 copy_verf(new, &clverifier);
 772                 new->cl_addr = ip_addr;
 773                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 774                 gen_clid(new);
 775                 gen_confirm(new);
 776                 gen_callback(new, setclid);
 777                 add_to_unconfirmed(new, strhashval);
 778         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 779                 /*
 780                  * CASE 1:
 781                  * cl_name match, confirmed, principal match
 782                  * verifier match: probable callback update
 783                  *
 784                  * remove any unconfirmed nfs4_client with
 785                  * matching cl_name, cl_verifier, and cl_clientid
 786                  *
 787                  * create and insert an unconfirmed nfs4_client with same
 788                  * cl_name, cl_verifier, and cl_clientid as existing
 789                  * nfs4_client,  but with the new callback info and a
 790                  * new cl_confirm
 791                  */
 792                 if (unconf) {
 793                         /* Note this is removing unconfirmed {*x***},
 794                          * which is stronger than RFC recommended {vxc**}.
 795                          * This has the advantage that there is at most
 796                          * one {*x***} in either list at any time.
 797                          */
 798                         expire_client(unconf);
 799                 }
 800                 new = create_client(clname, dname);
 801                 if (new == NULL)
 802                         goto out;
 803                 copy_verf(new,&conf->cl_verifier);
 804                 new->cl_addr = ip_addr;
 805                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 806                 copy_clid(new, conf);
 807                 gen_confirm(new);
 808                 gen_callback(new, setclid);
 809                 add_to_unconfirmed(new,strhashval);
 810         } else if (!unconf) {
 811                 /*
 812                  * CASE 2:
 813                  * clname match, confirmed, principal match
 814                  * verfier does not match
 815                  * no unconfirmed. create a new unconfirmed nfs4_client
 816                  * using input clverifier, clname, and callback info
 817                  * and generate a new cl_clientid and cl_confirm.
 818                  */
 819                 new = create_client(clname, dname);
 820                 if (new == NULL)
 821                         goto out;
 822                 copy_verf(new,&clverifier);
 823                 new->cl_addr = ip_addr;
 824                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 825                 gen_clid(new);
 826                 gen_confirm(new);
 827                 gen_callback(new, setclid);
 828                 add_to_unconfirmed(new, strhashval);
 829         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 830                 /*
 831                  * CASE3:
 832                  * confirmed found (name, principal match)
 833                  * confirmed verifier does not match input clverifier
 834                  *
 835                  * unconfirmed found (name match)
 836                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 837                  *
 838                  * remove unconfirmed.
 839                  *
 840                  * create an unconfirmed nfs4_client
 841                  * with same cl_name as existing confirmed nfs4_client,
 842                  * but with new callback info, new cl_clientid,
 843                  * new cl_verifier and a new cl_confirm
 844                  */
 845                 expire_client(unconf);
 846                 new = create_client(clname, dname);
 847                 if (new == NULL)
 848                         goto out;
 849                 copy_verf(new,&clverifier);
 850                 new->cl_addr = ip_addr;
 851                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 852                 gen_clid(new);
 853                 gen_confirm(new);
 854                 gen_callback(new, setclid);
 855                 add_to_unconfirmed(new, strhashval);
 856         } else {
 857                 /* No cases hit !!! */
 858                 status = nfserr_inval;
 859                 goto out;
 860
 861         }
 862         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 863         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 864         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 865         status = nfs_ok;
 866 out:
 867         nfs4_unlock_state();
 868         return status;
 869 }
 870
 871
 872 /*
 873  * RFC 3010 has a complex implmentation description of processing a
 874  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 875  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 876  *
 877  * NOTE: callback information will be processed here in a future patch
 878  */
 879 __be32
 880 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 881                          struct nfsd4_compound_state *cstate,
 882                          struct nfsd4_setclientid_confirm *setclientid_confirm)
 883 {
 884         __be32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 885         struct nfs4_client *conf, *unconf;
 886         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 887         clientid_t * clid = &setclientid_confirm->sc_clientid;
 888         __be32 status;
 889
 890         if (STALE_CLIENTID(clid))
 891                 return nfserr_stale_clientid;
 892         /*
 893          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 894          * We get here on a DRC miss.
 895          */
 896
 897         nfs4_lock_state();
 898
 899         conf = find_confirmed_client(clid);
 900         unconf = find_unconfirmed_client(clid);
 901
 902         status = nfserr_clid_inuse;
 903         if (conf && conf->cl_addr != ip_addr)
 904                 goto out;
 905         if (unconf && unconf->cl_addr != ip_addr)
 906                 goto out;
 907
 908         if ((conf && unconf) &&
 909             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 910             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 911             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 912             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 913                 /* CASE 1:
 914                 * unconf record that matches input clientid and input confirm.
 915                 * conf record that matches input clientid.
 916                 * conf and unconf records match names, verifiers
 917                 */
 918                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 919                         status = nfserr_clid_inuse;
 920                 else {
 921                         /* XXX: We just turn off callbacks until we can handle
 922                           * change request correctly. */
 923                         atomic_set(&conf->cl_callback.cb_set, 0);
 924                         gen_confirm(conf);
 925                         nfsd4_remove_clid_dir(unconf);
 926                         expire_client(unconf);
 927                         status = nfs_ok;
 928
 929                 }
 930         } else if ((conf && !unconf) ||
 931             ((conf && unconf) &&
 932              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 933               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 934                 /* CASE 2:
 935                  * conf record that matches input clientid.
 936                  * if unconf record matches input clientid, then
 937                  * unconf->cl_name or unconf->cl_verifier don't match the
 938                  * conf record.
 939                  */
 940                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
 941                         status = nfserr_clid_inuse;
 942                 else
 943                         status = nfs_ok;
 944         } else if (!conf && unconf
 945                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
 946                 /* CASE 3:
 947                  * conf record not found.
 948                  * unconf record found.
 949                  * unconf->cl_confirm matches input confirm
 950                  */
 951                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 952                         status = nfserr_clid_inuse;
 953                 } else {
 954                         unsigned int hash =
 955                                 clientstr_hashval(unconf->cl_recdir);
 956                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 957                                                                         hash);
 958                         if (conf) {
 959                                 nfsd4_remove_clid_dir(conf);
 960                                 expire_client(conf);
 961                         }
 962                         move_to_confirmed(unconf);
 963                         conf = unconf;
 964                         status = nfs_ok;
 965                 }
 966         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
 967             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
 968                                                                 &confirm)))) {
 969                 /* CASE 4:
 970                  * conf record not found, or if conf, conf->cl_confirm does not
 971                  * match input confirm.
 972                  * unconf record not found, or if unconf, unconf->cl_confirm
 973                  * does not match input confirm.
 974                  */
 975                 status = nfserr_stale_clientid;
 976         } else {
 977                 /* check that we have hit one of the cases...*/
 978                 status = nfserr_clid_inuse;
 979         }
 980 out:
 981         if (!status)
 982                 nfsd4_probe_callback(conf);
 983         nfs4_unlock_state();
 984         return status;
 985 }
 986
 987 /* OPEN Share state helper functions */
 988 static inline struct nfs4_file *
 989 alloc_init_file(struct inode *ino)
 990 {
 991         struct nfs4_file *fp;
 992         unsigned int hashval = file_hashval(ino);
 993
 994         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 995         if (fp) {
 996                 kref_init(&fp->fi_ref);
 997                 INIT_LIST_HEAD(&fp->fi_hash);
 998                 INIT_LIST_HEAD(&fp->fi_stateids);
 999                 INIT_LIST_HEAD(&fp->fi_delegations);
1000                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1001                 fp->fi_inode = igrab(ino);
1002                 fp->fi_id = current_fileid++;
1003                 return fp;
1004         }
1005         return NULL;
1006 }
1007
1008 static void
1009 nfsd4_free_slab(struct kmem_cache **slab)
1010 {
1011         if (*slab == NULL)
1012                 return;
1013         kmem_cache_destroy(*slab);
1014         *slab = NULL;
1015 }
1016
1017 static void
1018 nfsd4_free_slabs(void)
1019 {
1020         nfsd4_free_slab(&stateowner_slab);
1021         nfsd4_free_slab(&file_slab);
1022         nfsd4_free_slab(&stateid_slab);
1023         nfsd4_free_slab(&deleg_slab);
1024 }
1025
1026 static int
1027 nfsd4_init_slabs(void)
1028 {
1029         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1030                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1031         if (stateowner_slab == NULL)
1032                 goto out_nomem;
1033         file_slab = kmem_cache_create("nfsd4_files",
1034                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1035         if (file_slab == NULL)
1036                 goto out_nomem;
1037         stateid_slab = kmem_cache_create("nfsd4_stateids",
1038                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1039         if (stateid_slab == NULL)
1040                 goto out_nomem;
1041         deleg_slab = kmem_cache_create("nfsd4_delegations",
1042                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1043         if (deleg_slab == NULL)
1044                 goto out_nomem;
1045         return 0;
1046 out_nomem:
1047         nfsd4_free_slabs();
1048         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1049         return -ENOMEM;
1050 }
1051
1052 void
1053 nfs4_free_stateowner(struct kref *kref)
1054 {
1055         struct nfs4_stateowner *sop =
1056                 container_of(kref, struct nfs4_stateowner, so_ref);
1057         kfree(sop->so_owner.data);
1058         kmem_cache_free(stateowner_slab, sop);
1059 }
1060
1061 static inline struct nfs4_stateowner *
1062 alloc_stateowner(struct xdr_netobj *owner)
1063 {
1064         struct nfs4_stateowner *sop;
1065
1066         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1067                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1068                         memcpy(sop->so_owner.data, owner->data, owner->len);
1069                         sop->so_owner.len = owner->len;
1070                         kref_init(&sop->so_ref);
1071                         return sop;
1072                 }
1073                 kmem_cache_free(stateowner_slab, sop);
1074         }
1075         return NULL;
1076 }
1077
1078 static struct nfs4_stateowner *
1079 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1080         struct nfs4_stateowner *sop;
1081         struct nfs4_replay *rp;
1082         unsigned int idhashval;
1083
1084         if (!(sop = alloc_stateowner(&open->op_owner)))
1085                 return NULL;
1086         idhashval = ownerid_hashval(current_ownerid);
1087         INIT_LIST_HEAD(&sop->so_idhash);
1088         INIT_LIST_HEAD(&sop->so_strhash);
1089         INIT_LIST_HEAD(&sop->so_perclient);
1090         INIT_LIST_HEAD(&sop->so_stateids);
1091         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1092         INIT_LIST_HEAD(&sop->so_close_lru);
1093         sop->so_time = 0;
1094         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1095         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1096         list_add(&sop->so_perclient, &clp->cl_openowners);
1097         sop->so_is_open_owner = 1;
1098         sop->so_id = current_ownerid++;
1099         sop->so_client = clp;
1100         sop->so_seqid = open->op_seqid;
1101         sop->so_confirmed = 0;
1102         rp = &sop->so_replay;
1103         rp->rp_status = nfserr_serverfault;
1104         rp->rp_buflen = 0;
1105         rp->rp_buf = rp->rp_ibuf;
1106         return sop;
1107 }
1108
1109 static void
1110 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1111 {
1112         struct nfs4_stateowner *lock_sop;
1113
1114         while (!list_empty(&open_stp->st_lockowners)) {
1115                 lock_sop = list_entry(open_stp->st_lockowners.next,
1116                                 struct nfs4_stateowner, so_perstateid);
1117                 /* list_del(&open_stp->st_lockowners);  */
1118                 BUG_ON(lock_sop->so_is_open_owner);
1119                 release_stateowner(lock_sop);
1120         }
1121 }
1122
1123 static void
1124 unhash_stateowner(struct nfs4_stateowner *sop)
1125 {
1126         struct nfs4_stateid *stp;
1127
1128         list_del(&sop->so_idhash);
1129         list_del(&sop->so_strhash);
1130         if (sop->so_is_open_owner)
1131                 list_del(&sop->so_perclient);
1132         list_del(&sop->so_perstateid);
1133         while (!list_empty(&sop->so_stateids)) {
1134                 stp = list_entry(sop->so_stateids.next,
1135                         struct nfs4_stateid, st_perstateowner);
1136                 if (sop->so_is_open_owner)
1137                         release_stateid(stp, OPEN_STATE);
1138                 else
1139                         release_stateid(stp, LOCK_STATE);
1140         }
1141 }
1142
1143 static void
1144 release_stateowner(struct nfs4_stateowner *sop)
1145 {
1146         unhash_stateowner(sop);
1147         list_del(&sop->so_close_lru);
1148         nfs4_put_stateowner(sop);
1149 }
1150
1151 static inline void
1152 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1153         struct nfs4_stateowner *sop = open->op_stateowner;
1154         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1155
1156         INIT_LIST_HEAD(&stp->st_hash);
1157         INIT_LIST_HEAD(&stp->st_perstateowner);
1158         INIT_LIST_HEAD(&stp->st_lockowners);
1159         INIT_LIST_HEAD(&stp->st_perfile);
1160         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1161         list_add(&stp->st_perstateowner, &sop->so_stateids);
1162         list_add(&stp->st_perfile, &fp->fi_stateids);
1163         stp->st_stateowner = sop;
1164         get_nfs4_file(fp);
1165         stp->st_file = fp;
1166         stp->st_stateid.si_boot = boot_time;
1167         stp->st_stateid.si_stateownerid = sop->so_id;
1168         stp->st_stateid.si_fileid = fp->fi_id;
1169         stp->st_stateid.si_generation = 0;
1170         stp->st_access_bmap = 0;
1171         stp->st_deny_bmap = 0;
1172         __set_bit(open->op_share_access, &stp->st_access_bmap);
1173         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1174         stp->st_openstp = NULL;
1175 }
1176
1177 static void
1178 release_stateid(struct nfs4_stateid *stp, int flags)
1179 {
1180         struct file *filp = stp->st_vfs_file;
1181
1182         list_del(&stp->st_hash);
1183         list_del(&stp->st_perfile);
1184         list_del(&stp->st_perstateowner);
1185         if (flags & OPEN_STATE) {
1186                 release_stateid_lockowners(stp);
1187                 stp->st_vfs_file = NULL;
1188                 nfsd_close(filp);
1189         } else if (flags & LOCK_STATE)
1190                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1191         put_nfs4_file(stp->st_file);
1192         kmem_cache_free(stateid_slab, stp);
1193 }
1194
1195 static void
1196 move_to_close_lru(struct nfs4_stateowner *sop)
1197 {
1198         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1199
1200         list_move_tail(&sop->so_close_lru, &close_lru);
1201         sop->so_time = get_seconds();
1202 }
1203
1204 static int
1205 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1206         return ((sop->so_owner.len == owner->len) &&
1207          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1208           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1209 }
1210
1211 static struct nfs4_stateowner *
1212 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1213 {
1214         struct nfs4_stateowner *so = NULL;
1215
1216         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1217                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1218                         return so;
1219         }
1220         return NULL;
1221 }
1222
1223 /* search file_hashtbl[] for file */
1224 static struct nfs4_file *
1225 find_file(struct inode *ino)
1226 {
1227         unsigned int hashval = file_hashval(ino);
1228         struct nfs4_file *fp;
1229
1230         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1231                 if (fp->fi_inode == ino) {
1232                         get_nfs4_file(fp);
1233                         return fp;
1234                 }
1235         }
1236         return NULL;
1237 }
1238
1239 static int access_valid(u32 x)
1240 {
1241         return (x > 0 && x < 4);
1242 }
1243
1244 static int deny_valid(u32 x)
1245 {
1246         return (x >= 0 && x < 5);
1247 }
1248
1249 static void
1250 set_access(unsigned int *access, unsigned long bmap) {
1251         int i;
1252
1253         *access = 0;
1254         for (i = 1; i < 4; i++) {
1255                 if (test_bit(i, &bmap))
1256                         *access |= i;
1257         }
1258 }
1259
1260 static void
1261 set_deny(unsigned int *deny, unsigned long bmap) {
1262         int i;
1263
1264         *deny = 0;
1265         for (i = 0; i < 4; i++) {
1266                 if (test_bit(i, &bmap))
1267                         *deny |= i ;
1268         }
1269 }
1270
1271 static int
1272 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1273         unsigned int access, deny;
1274
1275         set_access(&access, stp->st_access_bmap);
1276         set_deny(&deny, stp->st_deny_bmap);
1277         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1278                 return 0;
1279         return 1;
1280 }
1281
1282 /*
1283  * Called to check deny when READ with all zero stateid or
1284  * WRITE with all zero or all one stateid
1285  */
1286 static __be32
1287 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1288 {
1289         struct inode *ino = current_fh->fh_dentry->d_inode;
1290         struct nfs4_file *fp;
1291         struct nfs4_stateid *stp;
1292         __be32 ret;
1293
1294         dprintk("NFSD: nfs4_share_conflict\n");
1295
1296         fp = find_file(ino);
1297         if (!fp)
1298                 return nfs_ok;
1299         ret = nfserr_locked;
1300         /* Search for conflicting share reservations */
1301         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1302                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1303                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1304                         goto out;
1305         }
1306         ret = nfs_ok;
1307 out:
1308         put_nfs4_file(fp);
1309         return ret;
1310 }
1311
1312 static inline void
1313 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1314 {
1315         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1316                 put_write_access(filp->f_path.dentry->d_inode);
1317                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1318         }
1319 }
1320
1321 /*
1322  * Recall a delegation
1323  */
1324 static int
1325 do_recall(void *__dp)
1326 {
1327         struct nfs4_delegation *dp = __dp;
1328
1329         daemonize("nfsv4-recall");
1330
1331         nfsd4_cb_recall(dp);
1332         return 0;
1333 }
1334
1335 /*
1336  * Spawn a thread to perform a recall on the delegation represented
1337  * by the lease (file_lock)
1338  *
1339  * Called from break_lease() with lock_kernel() held.
1340  * Note: we assume break_lease will only call this *once* for any given
1341  * lease.
1342  */
1343 static
1344 void nfsd_break_deleg_cb(struct file_lock *fl)
1345 {
1346         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1347         struct task_struct *t;
1348
1349         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1350         if (!dp)
1351                 return;
1352
1353         /* We're assuming the state code never drops its reference
1354          * without first removing the lease.  Since we're in this lease
1355          * callback (and since the lease code is serialized by the kernel
1356          * lock) we know the server hasn't removed the lease yet, we know
1357          * it's safe to take a reference: */
1358         atomic_inc(&dp->dl_count);
1359
1360         spin_lock(&recall_lock);
1361         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1362         spin_unlock(&recall_lock);
1363
1364         /* only place dl_time is set. protected by lock_kernel*/
1365         dp->dl_time = get_seconds();
1366
1367         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1368         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1369
1370         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1371         if (IS_ERR(t)) {
1372                 struct nfs4_client *clp = dp->dl_client;
1373
1374                 printk(KERN_INFO "NFSD: Callback thread failed for "
1375                         "for client (clientid %08x/%08x)\n",
1376                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1377                 nfs4_put_delegation(dp);
1378         }
1379 }
1380
1381 /*
1382  * The file_lock is being reapd.
1383  *
1384  * Called by locks_free_lock() with lock_kernel() held.
1385  */
1386 static
1387 void nfsd_release_deleg_cb(struct file_lock *fl)
1388 {
1389         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1390
1391         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1392
1393         if (!(fl->fl_flags & FL_LEASE) || !dp)
1394                 return;
1395         dp->dl_flock = NULL;
1396 }
1397
1398 /*
1399  * Set the delegation file_lock back pointer.
1400  *
1401  * Called from __setlease() with lock_kernel() held.
1402  */
1403 static
1404 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1405 {
1406         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1407
1408         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1409         if (!dp)
1410                 return;
1411         dp->dl_flock = new;
1412 }
1413
1414 /*
1415  * Called from __setlease() with lock_kernel() held
1416  */
1417 static
1418 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1419 {
1420         struct nfs4_delegation *onlistd =
1421                 (struct nfs4_delegation *)onlist->fl_owner;
1422         struct nfs4_delegation *tryd =
1423                 (struct nfs4_delegation *)try->fl_owner;
1424
1425         if (onlist->fl_lmops != try->fl_lmops)
1426                 return 0;
1427
1428         return onlistd->dl_client == tryd->dl_client;
1429 }
1430
1431
1432 static
1433 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1434 {
1435         if (arg & F_UNLCK)
1436                 return lease_modify(onlist, arg);
1437         else
1438                 return -EAGAIN;
1439 }
1440
1441 static struct lock_manager_operations nfsd_lease_mng_ops = {
1442         .fl_break = nfsd_break_deleg_cb,
1443         .fl_release_private = nfsd_release_deleg_cb,
1444         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1445         .fl_mylease = nfsd_same_client_deleg_cb,
1446         .fl_change = nfsd_change_deleg_cb,
1447 };
1448
1449
1450 __be32
1451 nfsd4_process_open1(struct nfsd4_open *open)
1452 {
1453         clientid_t *clientid = &open->op_clientid;
1454         struct nfs4_client *clp = NULL;
1455         unsigned int strhashval;
1456         struct nfs4_stateowner *sop = NULL;
1457
1458         if (!check_name(open->op_owner))
1459                 return nfserr_inval;
1460
1461         if (STALE_CLIENTID(&open->op_clientid))
1462                 return nfserr_stale_clientid;
1463
1464         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1465         sop = find_openstateowner_str(strhashval, open);
1466         open->op_stateowner = sop;
1467         if (!sop) {
1468                 /* Make sure the client's lease hasn't expired. */
1469                 clp = find_confirmed_client(clientid);
1470                 if (clp == NULL)
1471                         return nfserr_expired;
1472                 goto renew;
1473         }
1474         if (!sop->so_confirmed) {
1475                 /* Replace unconfirmed owners without checking for replay. */
1476                 clp = sop->so_client;
1477                 release_stateowner(sop);
1478                 open->op_stateowner = NULL;
1479                 goto renew;
1480         }
1481         if (open->op_seqid == sop->so_seqid - 1) {
1482                 if (sop->so_replay.rp_buflen)
1483                         return nfserr_replay_me;
1484                 /* The original OPEN failed so spectacularly
1485                  * that we don't even have replay data saved!
1486                  * Therefore, we have no choice but to continue
1487                  * processing this OPEN; presumably, we'll
1488                  * fail again for the same reason.
1489                  */
1490                 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1491                 goto renew;
1492         }
1493         if (open->op_seqid != sop->so_seqid)
1494                 return nfserr_bad_seqid;
1495 renew:
1496         if (open->op_stateowner == NULL) {
1497                 sop = alloc_init_open_stateowner(strhashval, clp, open);
1498                 if (sop == NULL)
1499                         return nfserr_resource;
1500                 open->op_stateowner = sop;
1501         }
1502         list_del_init(&sop->so_close_lru);
1503         renew_client(sop->so_client);
1504         return nfs_ok;
1505 }
1506
1507 static inline __be32
1508 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1509 {
1510         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1511                 return nfserr_openmode;
1512         else
1513                 return nfs_ok;
1514 }
1515
1516 static struct nfs4_delegation *
1517 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1518 {
1519         struct nfs4_delegation *dp;
1520
1521         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1522                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1523                         return dp;
1524         }
1525         return NULL;
1526 }
1527
1528 static __be32
1529 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1530                 struct nfs4_delegation **dp)
1531 {
1532         int flags;
1533         __be32 status = nfserr_bad_stateid;
1534
1535         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1536         if (*dp == NULL)
1537                 goto out;
1538         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1539                                                 RD_STATE : WR_STATE;
1540         status = nfs4_check_delegmode(*dp, flags);
1541         if (status)
1542                 *dp = NULL;
1543 out:
1544         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1545                 return nfs_ok;
1546         if (status)
1547                 return status;
1548         open->op_stateowner->so_confirmed = 1;
1549         return nfs_ok;
1550 }
1551
1552 static __be32
1553 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1554 {
1555         struct nfs4_stateid *local;
1556         __be32 status = nfserr_share_denied;
1557         struct nfs4_stateowner *sop = open->op_stateowner;
1558
1559         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1560                 /* ignore lock owners */
1561                 if (local->st_stateowner->so_is_open_owner == 0)
1562                         continue;
1563                 /* remember if we have seen this open owner */
1564                 if (local->st_stateowner == sop)
1565                         *stpp = local;
1566                 /* check for conflicting share reservations */
1567                 if (!test_share(local, open))
1568                         goto out;
1569         }
1570         status = 0;
1571 out:
1572         return status;
1573 }
1574
1575 static inline struct nfs4_stateid *
1576 nfs4_alloc_stateid(void)
1577 {
1578         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1579 }
1580
1581 static __be32
1582 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1583                 struct nfs4_delegation *dp,
1584                 struct svc_fh *cur_fh, int flags)
1585 {
1586         struct nfs4_stateid *stp;
1587
1588         stp = nfs4_alloc_stateid();
1589         if (stp == NULL)
1590                 return nfserr_resource;
1591
1592         if (dp) {
1593                 get_file(dp->dl_vfs_file);
1594                 stp->st_vfs_file = dp->dl_vfs_file;
1595         } else {
1596                 __be32 status;
1597                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1598                                 &stp->st_vfs_file);
1599                 if (status) {
1600                         if (status == nfserr_dropit)
1601                                 status = nfserr_jukebox;
1602                         kmem_cache_free(stateid_slab, stp);
1603                         return status;
1604                 }
1605         }
1606         *stpp = stp;
1607         return 0;
1608 }
1609
1610 static inline __be32
1611 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1612                 struct nfsd4_open *open)
1613 {
1614         struct iattr iattr = {
1615                 .ia_valid = ATTR_SIZE,
1616                 .ia_size = 0,
1617         };
1618         if (!open->op_truncate)
1619                 return 0;
1620         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1621                 return nfserr_inval;
1622         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1623 }
1624
1625 static __be32
1626 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1627 {
1628         struct file *filp = stp->st_vfs_file;
1629         struct inode *inode = filp->f_path.dentry->d_inode;
1630         unsigned int share_access, new_writer;
1631         __be32 status;
1632
1633         set_access(&share_access, stp->st_access_bmap);
1634         new_writer = (~share_access) & open->op_share_access
1635                         & NFS4_SHARE_ACCESS_WRITE;
1636
1637         if (new_writer) {
1638                 int err = get_write_access(inode);
1639                 if (err)
1640                         return nfserrno(err);
1641         }
1642         status = nfsd4_truncate(rqstp, cur_fh, open);
1643         if (status) {
1644                 if (new_writer)
1645                         put_write_access(inode);
1646                 return status;
1647         }
1648         /* remember the open */
1649         filp->f_mode |= open->op_share_access;
1650         set_bit(open->op_share_access, &stp->st_access_bmap);
1651         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1652
1653         return nfs_ok;
1654 }
1655
1656
1657 static void
1658 nfs4_set_claim_prev(struct nfsd4_open *open)
1659 {
1660         open->op_stateowner->so_confirmed = 1;
1661         open->op_stateowner->so_client->cl_firststate = 1;
1662 }
1663
1664 /*
1665  * Attempt to hand out a delegation.
1666  */
1667 static void
1668 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1669 {
1670         struct nfs4_delegation *dp;
1671         struct nfs4_stateowner *sop = stp->st_stateowner;
1672         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1673         struct file_lock fl, *flp = &fl;
1674         int status, flag = 0;
1675
1676         flag = NFS4_OPEN_DELEGATE_NONE;
1677         open->op_recall = 0;
1678         switch (open->op_claim_type) {
1679                 case NFS4_OPEN_CLAIM_PREVIOUS:
1680                         if (!atomic_read(&cb->cb_set))
1681                                 open->op_recall = 1;
1682                         flag = open->op_delegate_type;
1683                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1684                                 goto out;
1685                         break;
1686                 case NFS4_OPEN_CLAIM_NULL:
1687                         /* Let's not give out any delegations till everyone's
1688                          * had the chance to reclaim theirs.... */
1689                         if (nfs4_in_grace())
1690                                 goto out;
1691                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1692                                 goto out;
1693                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1694                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1695                         else
1696                                 flag = NFS4_OPEN_DELEGATE_READ;
1697                         break;
1698                 default:
1699                         goto out;
1700         }
1701
1702         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1703         if (dp == NULL) {
1704                 flag = NFS4_OPEN_DELEGATE_NONE;
1705                 goto out;
1706         }
1707         locks_init_lock(&fl);
1708         fl.fl_lmops = &nfsd_lease_mng_ops;
1709         fl.fl_flags = FL_LEASE;
1710         fl.fl_end = OFFSET_MAX;
1711         fl.fl_owner =  (fl_owner_t)dp;
1712         fl.fl_file = stp->st_vfs_file;
1713         fl.fl_pid = current->tgid;
1714
1715         /* setlease checks to see if delegation should be handed out.
1716          * the lock_manager callbacks fl_mylease and fl_change are used
1717          */
1718         if ((status = setlease(stp->st_vfs_file,
1719                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1720                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1721                 unhash_delegation(dp);
1722                 flag = NFS4_OPEN_DELEGATE_NONE;
1723                 goto out;
1724         }
1725
1726         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1727
1728         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1729                      dp->dl_stateid.si_boot,
1730                      dp->dl_stateid.si_stateownerid,
1731                      dp->dl_stateid.si_fileid,
1732                      dp->dl_stateid.si_generation);
1733 out:
1734         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1735                         && flag == NFS4_OPEN_DELEGATE_NONE
1736                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1737                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1738         open->op_delegate_type = flag;
1739 }
1740
1741 /*
1742  * called with nfs4_lock_state() held.
1743  */
1744 __be32
1745 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1746 {
1747         struct nfs4_file *fp = NULL;
1748         struct inode *ino = current_fh->fh_dentry->d_inode;
1749         struct nfs4_stateid *stp = NULL;
1750         struct nfs4_delegation *dp = NULL;
1751         __be32 status;
1752
1753         status = nfserr_inval;
1754         if (!access_valid(open->op_share_access)
1755                         || !deny_valid(open->op_share_deny))
1756                 goto out;
1757         /*
1758          * Lookup file; if found, lookup stateid and check open request,
1759          * and check for delegations in the process of being recalled.
1760          * If not found, create the nfs4_file struct
1761          */
1762         fp = find_file(ino);
1763         if (fp) {
1764                 if ((status = nfs4_check_open(fp, open, &stp)))
1765                         goto out;
1766                 status = nfs4_check_deleg(fp, open, &dp);
1767                 if (status)
1768                         goto out;
1769         } else {
1770                 status = nfserr_bad_stateid;
1771                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1772                         goto out;
1773                 status = nfserr_resource;
1774                 fp = alloc_init_file(ino);
1775                 if (fp == NULL)
1776                         goto out;
1777         }
1778
1779         /*
1780          * OPEN the file, or upgrade an existing OPEN.
1781          * If truncate fails, the OPEN fails.
1782          */
1783         if (stp) {
1784                 /* Stateid was found, this is an OPEN upgrade */
1785                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1786                 if (status)
1787                         goto out;
1788                 update_stateid(&stp->st_stateid);
1789         } else {
1790                 /* Stateid was not found, this is a new OPEN */
1791                 int flags = 0;
1792                 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1793                         flags |= MAY_READ;
1794                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1795                         flags |= MAY_WRITE;
1796                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1797                 if (status)
1798                         goto out;
1799                 init_stateid(stp, fp, open);
1800                 status = nfsd4_truncate(rqstp, current_fh, open);
1801                 if (status) {
1802                         release_stateid(stp, OPEN_STATE);
1803                         goto out;
1804                 }
1805         }
1806         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1807
1808         /*
1809         * Attempt to hand out a delegation. No error return, because the
1810         * OPEN succeeds even if we fail.
1811         */
1812         nfs4_open_delegation(current_fh, open, stp);
1813
1814         status = nfs_ok;
1815
1816         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1817                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1818                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1819 out:
1820         if (fp)
1821                 put_nfs4_file(fp);
1822         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1823                 nfs4_set_claim_prev(open);
1824         /*
1825         * To finish the open response, we just need to set the rflags.
1826         */
1827         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1828         if (!open->op_stateowner->so_confirmed)
1829                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1830
1831         return status;
1832 }
1833
1834 static struct workqueue_struct *laundry_wq;
1835 static void laundromat_main(struct work_struct *);
1836 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1837
1838 __be32
1839 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1840             clientid_t *clid)
1841 {
1842         struct nfs4_client *clp;
1843         __be32 status;
1844
1845         nfs4_lock_state();
1846         dprintk("process_renew(%08x/%08x): starting\n",
1847                         clid->cl_boot, clid->cl_id);
1848         status = nfserr_stale_clientid;
1849         if (STALE_CLIENTID(clid))
1850                 goto out;
1851         clp = find_confirmed_client(clid);
1852         status = nfserr_expired;
1853         if (clp == NULL) {
1854                 /* We assume the client took too long to RENEW. */
1855                 dprintk("nfsd4_renew: clientid not found!\n");
1856                 goto out;
1857         }
1858         renew_client(clp);
1859         status = nfserr_cb_path_down;
1860         if (!list_empty(&clp->cl_delegations)
1861                         && !atomic_read(&clp->cl_callback.cb_set))
1862                 goto out;
1863         status = nfs_ok;
1864 out:
1865         nfs4_unlock_state();
1866         return status;
1867 }
1868
1869 static void
1870 end_grace(void)
1871 {
1872         dprintk("NFSD: end of grace period\n");
1873         nfsd4_recdir_purge_old();
1874         in_grace = 0;
1875 }
1876
1877 static time_t
1878 nfs4_laundromat(void)
1879 {
1880         struct nfs4_client *clp;
1881         struct nfs4_stateowner *sop;
1882         struct nfs4_delegation *dp;
1883         struct list_head *pos, *next, reaplist;
1884         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1885         time_t t, clientid_val = NFSD_LEASE_TIME;
1886         time_t u, test_val = NFSD_LEASE_TIME;
1887
1888         nfs4_lock_state();
1889
1890         dprintk("NFSD: laundromat service - starting\n");
1891         if (in_grace)
1892                 end_grace();
1893         list_for_each_safe(pos, next, &client_lru) {
1894                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1895                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1896                         t = clp->cl_time - cutoff;
1897                         if (clientid_val > t)
1898                                 clientid_val = t;
1899                         break;
1900                 }
1901                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1902                         clp->cl_clientid.cl_id);
1903                 nfsd4_remove_clid_dir(clp);
1904                 expire_client(clp);
1905         }
1906         INIT_LIST_HEAD(&reaplist);
1907         spin_lock(&recall_lock);
1908         list_for_each_safe(pos, next, &del_recall_lru) {
1909                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1910                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1911                         u = dp->dl_time - cutoff;
1912                         if (test_val > u)
1913                                 test_val = u;
1914                         break;
1915                 }
1916                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1917                                     dp, dp->dl_flock);
1918                 list_move(&dp->dl_recall_lru, &reaplist);
1919         }
1920         spin_unlock(&recall_lock);
1921         list_for_each_safe(pos, next, &reaplist) {
1922                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1923                 list_del_init(&dp->dl_recall_lru);
1924                 unhash_delegation(dp);
1925         }
1926         test_val = NFSD_LEASE_TIME;
1927         list_for_each_safe(pos, next, &close_lru) {
1928                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1929                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1930                         u = sop->so_time - cutoff;
1931                         if (test_val > u)
1932                                 test_val = u;
1933                         break;
1934                 }
1935                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1936                         sop->so_id);
1937                 release_stateowner(sop);
1938         }
1939         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1940                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1941         nfs4_unlock_state();
1942         return clientid_val;
1943 }
1944
1945 void
1946 laundromat_main(struct work_struct *not_used)
1947 {
1948         time_t t;
1949
1950         t = nfs4_laundromat();
1951         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1952         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1953 }
1954
1955 static struct nfs4_stateowner *
1956 search_close_lru(u32 st_id, int flags)
1957 {
1958         struct nfs4_stateowner *local = NULL;
1959
1960         if (flags & CLOSE_STATE) {
1961                 list_for_each_entry(local, &close_lru, so_close_lru) {
1962                         if (local->so_id == st_id)
1963                                 return local;
1964                 }
1965         }
1966         return NULL;
1967 }
1968
1969 static inline int
1970 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1971 {
1972         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1973 }
1974
1975 static int
1976 STALE_STATEID(stateid_t *stateid)
1977 {
1978         if (stateid->si_boot == boot_time)
1979                 return 0;
1980         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1981                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1982                 stateid->si_generation);
1983         return 1;
1984 }
1985
1986 static inline int
1987 access_permit_read(unsigned long access_bmap)
1988 {
1989         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1990                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1991                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1992 }
1993
1994 static inline int
1995 access_permit_write(unsigned long access_bmap)
1996 {
1997         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1998                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1999 }
2000
2001 static
2002 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2003 {
2004         __be32 status = nfserr_openmode;
2005
2006         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2007                 goto out;
2008         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2009                 goto out;
2010         status = nfs_ok;
2011 out:
2012         return status;
2013 }
2014
2015 static inline __be32
2016 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2017 {
2018         /* Trying to call delegreturn with a special stateid? Yuch: */
2019         if (!(flags & (RD_STATE | WR_STATE)))
2020                 return nfserr_bad_stateid;
2021         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2022                 return nfs_ok;
2023         else if (nfs4_in_grace()) {
2024                 /* Answer in remaining cases depends on existance of
2025                  * conflicting state; so we must wait out the grace period. */
2026                 return nfserr_grace;
2027         } else if (flags & WR_STATE)
2028                 return nfs4_share_conflict(current_fh,
2029                                 NFS4_SHARE_DENY_WRITE);
2030         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2031                 return nfs4_share_conflict(current_fh,
2032                                 NFS4_SHARE_DENY_READ);
2033 }
2034
2035 /*
2036  * Allow READ/WRITE during grace period on recovered state only for files
2037  * that are not able to provide mandatory locking.
2038  */
2039 static inline int
2040 io_during_grace_disallowed(struct inode *inode, int flags)
2041 {
2042         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2043                 && MANDATORY_LOCK(inode);
2044 }
2045
2046 /*
2047 * Checks for stateid operations
2048 */
2049 __be32
2050 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2051 {
2052         struct nfs4_stateid *stp = NULL;
2053         struct nfs4_delegation *dp = NULL;
2054         stateid_t *stidp;
2055         struct inode *ino = current_fh->fh_dentry->d_inode;
2056         __be32 status;
2057
2058         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2059                 stateid->si_boot, stateid->si_stateownerid,
2060                 stateid->si_fileid, stateid->si_generation);
2061         if (filpp)
2062                 *filpp = NULL;
2063
2064         if (io_during_grace_disallowed(ino, flags))
2065                 return nfserr_grace;
2066
2067         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2068                 return check_special_stateids(current_fh, stateid, flags);
2069
2070         /* STALE STATEID */
2071         status = nfserr_stale_stateid;
2072         if (STALE_STATEID(stateid))
2073                 goto out;
2074
2075         /* BAD STATEID */
2076         status = nfserr_bad_stateid;
2077         if (!stateid->si_fileid) { /* delegation stateid */
2078                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2079                         dprintk("NFSD: delegation stateid not found\n");
2080                         goto out;
2081                 }
2082                 stidp = &dp->dl_stateid;
2083         } else { /* open or lock stateid */
2084                 if (!(stp = find_stateid(stateid, flags))) {
2085                         dprintk("NFSD: open or lock stateid not found\n");
2086                         goto out;
2087                 }
2088                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2089                         goto out;
2090                 if (!stp->st_stateowner->so_confirmed)
2091                         goto out;
2092                 stidp = &stp->st_stateid;
2093         }
2094         if (stateid->si_generation > stidp->si_generation)
2095                 goto out;
2096
2097         /* OLD STATEID */
2098         status = nfserr_old_stateid;
2099         if (stateid->si_generation < stidp->si_generation)
2100                 goto out;
2101         if (stp) {
2102                 if ((status = nfs4_check_openmode(stp,flags)))
2103                         goto out;
2104                 renew_client(stp->st_stateowner->so_client);
2105                 if (filpp)
2106                         *filpp = stp->st_vfs_file;
2107         } else if (dp) {
2108                 if ((status = nfs4_check_delegmode(dp, flags)))
2109                         goto out;
2110                 renew_client(dp->dl_client);
2111                 if (flags & DELEG_RET)
2112                         unhash_delegation(dp);
2113                 if (filpp)
2114                         *filpp = dp->dl_vfs_file;
2115         }
2116         status = nfs_ok;
2117 out:
2118         return status;
2119 }
2120
2121 static inline int
2122 setlkflg (int type)
2123 {
2124         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2125                 RD_STATE : WR_STATE;
2126 }
2127
2128 /*
2129  * Checks for sequence id mutating operations.
2130  */
2131 static __be32
2132 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)
2133 {
2134         struct nfs4_stateid *stp;
2135         struct nfs4_stateowner *sop;
2136
2137         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2138                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2139                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2140                 stateid->si_generation);
2141
2142         *stpp = NULL;
2143         *sopp = NULL;
2144
2145         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2146                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2147                 return nfserr_bad_stateid;
2148         }
2149
2150         if (STALE_STATEID(stateid))
2151                 return nfserr_stale_stateid;
2152         /*
2153         * We return BAD_STATEID if filehandle doesn't match stateid,
2154         * the confirmed flag is incorrecly set, or the generation
2155         * number is incorrect.
2156         */
2157         stp = find_stateid(stateid, flags);
2158         if (stp == NULL) {
2159                 /*
2160                  * Also, we should make sure this isn't just the result of
2161                  * a replayed close:
2162                  */
2163                 sop = search_close_lru(stateid->si_stateownerid, flags);
2164                 if (sop == NULL)
2165                         return nfserr_bad_stateid;
2166                 *sopp = sop;
2167                 goto check_replay;
2168         }
2169
2170         if (lock) {
2171                 struct nfs4_stateowner *sop = stp->st_stateowner;
2172                 clientid_t *lockclid = &lock->v.new.clientid;
2173                 struct nfs4_client *clp = sop->so_client;
2174                 int lkflg = 0;
2175                 __be32 status;
2176
2177                 lkflg = setlkflg(lock->lk_type);
2178
2179                 if (lock->lk_is_new) {
2180                        if (!sop->so_is_open_owner)
2181                                return nfserr_bad_stateid;
2182                        if (!cmp_clid(&clp->cl_clientid, lockclid))
2183                                return nfserr_bad_stateid;
2184                        /* stp is the open stateid */
2185                        status = nfs4_check_openmode(stp, lkflg);
2186                        if (status)
2187                                return status;
2188                } else {
2189                        /* stp is the lock stateid */
2190                        status = nfs4_check_openmode(stp->st_openstp, lkflg);
2191                        if (status)
2192                                return status;
2193                }
2194
2195         }
2196
2197         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2198                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2199                 return nfserr_bad_stateid;
2200         }
2201
2202         *stpp = stp;
2203         *sopp = sop = stp->st_stateowner;
2204
2205         /*
2206         *  We now validate the seqid and stateid generation numbers.
2207         *  For the moment, we ignore the possibility of
2208         *  generation number wraparound.
2209         */
2210         if (seqid != sop->so_seqid)
2211                 goto check_replay;
2212
2213         if (sop->so_confirmed && flags & CONFIRM) {
2214                 printk("NFSD: preprocess_seqid_op: expected"
2215                                 " unconfirmed stateowner!\n");
2216                 return nfserr_bad_stateid;
2217         }
2218         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2219                 printk("NFSD: preprocess_seqid_op: stateowner not"
2220                                 " confirmed yet!\n");
2221                 return nfserr_bad_stateid;
2222         }
2223         if (stateid->si_generation > stp->st_stateid.si_generation) {
2224                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2225                 return nfserr_bad_stateid;
2226         }
2227
2228         if (stateid->si_generation < stp->st_stateid.si_generation) {
2229                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2230                 return nfserr_old_stateid;
2231         }
2232         renew_client(sop->so_client);
2233         return nfs_ok;
2234
2235 check_replay:
2236         if (seqid == sop->so_seqid - 1) {
2237                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2238                 /* indicate replay to calling function */
2239                 return nfserr_replay_me;
2240         }
2241         printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2242                         sop->so_seqid, seqid);
2243         *sopp = NULL;
2244         return nfserr_bad_seqid;
2245 }
2246
2247 __be32
2248 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2249                    struct nfsd4_open_confirm *oc)
2250 {
2251         __be32 status;
2252         struct nfs4_stateowner *sop;
2253         struct nfs4_stateid *stp;
2254
2255         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2256                         (int)cstate->current_fh.fh_dentry->d_name.len,
2257                         cstate->current_fh.fh_dentry->d_name.name);
2258
2259         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2260         if (status)
2261                 return status;
2262
2263         nfs4_lock_state();
2264
2265         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2266                                         oc->oc_seqid, &oc->oc_req_stateid,
2267                                         CHECK_FH | CONFIRM | OPEN_STATE,
2268                                         &oc->oc_stateowner, &stp, NULL)))
2269                 goto out;
2270
2271         sop = oc->oc_stateowner;
2272         sop->so_confirmed = 1;
2273         update_stateid(&stp->st_stateid);
2274         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2275         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2276                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2277                          stp->st_stateid.si_boot,
2278                          stp->st_stateid.si_stateownerid,
2279                          stp->st_stateid.si_fileid,
2280                          stp->st_stateid.si_generation);
2281
2282         nfsd4_create_clid_dir(sop->so_client);
2283 out:
2284         if (oc->oc_stateowner) {
2285                 nfs4_get_stateowner(oc->oc_stateowner);
2286                 cstate->replay_owner = oc->oc_stateowner;
2287         }
2288         nfs4_unlock_state();
2289         return status;
2290 }
2291
2292
2293 /*
2294  * unset all bits in union bitmap (bmap) that
2295  * do not exist in share (from successful OPEN_DOWNGRADE)
2296  */
2297 static void
2298 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2299 {
2300         int i;
2301         for (i = 1; i < 4; i++) {
2302                 if ((i & access) != i)
2303                         __clear_bit(i, bmap);
2304         }
2305 }
2306
2307 static void
2308 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2309 {
2310         int i;
2311         for (i = 0; i < 4; i++) {
2312                 if ((i & deny) != i)
2313                         __clear_bit(i, bmap);
2314         }
2315 }
2316
2317 __be32
2318 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2319                      struct nfsd4_compound_state *cstate,
2320                      struct nfsd4_open_downgrade *od)
2321 {
2322         __be32 status;
2323         struct nfs4_stateid *stp;
2324         unsigned int share_access;
2325
2326         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2327                         (int)cstate->current_fh.fh_dentry->d_name.len,
2328                         cstate->current_fh.fh_dentry->d_name.name);
2329
2330         if (!access_valid(od->od_share_access)
2331                         || !deny_valid(od->od_share_deny))
2332                 return nfserr_inval;
2333
2334         nfs4_lock_state();
2335         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2336                                         od->od_seqid,
2337                                         &od->od_stateid,
2338                                         CHECK_FH | OPEN_STATE,
2339                                         &od->od_stateowner, &stp, NULL)))
2340                 goto out;
2341
2342         status = nfserr_inval;
2343         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2344                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2345                         stp->st_access_bmap, od->od_share_access);
2346                 goto out;
2347         }
2348         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2349                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2350                         stp->st_deny_bmap, od->od_share_deny);
2351                 goto out;
2352         }
2353         set_access(&share_access, stp->st_access_bmap);
2354         nfs4_file_downgrade(stp->st_vfs_file,
2355                             share_access & ~od->od_share_access);
2356
2357         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2358         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2359
2360         update_stateid(&stp->st_stateid);
2361         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2362         status = nfs_ok;
2363 out:
2364         if (od->od_stateowner) {
2365                 nfs4_get_stateowner(od->od_stateowner);
2366                 cstate->replay_owner = od->od_stateowner;
2367         }
2368         nfs4_unlock_state();
2369         return status;
2370 }
2371
2372 /*
2373  * nfs4_unlock_state() called after encode
2374  */
2375 __be32
2376 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2377             struct nfsd4_close *close)
2378 {
2379         __be32 status;
2380         struct nfs4_stateid *stp;
2381
2382         dprintk("NFSD: nfsd4_close on file %.*s\n",
2383                         (int)cstate->current_fh.fh_dentry->d_name.len,
2384                         cstate->current_fh.fh_dentry->d_name.name);
2385
2386         nfs4_lock_state();
2387         /* check close_lru for replay */
2388         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2389                                         close->cl_seqid,
2390                                         &close->cl_stateid,
2391                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2392                                         &close->cl_stateowner, &stp, NULL)))
2393                 goto out;
2394         status = nfs_ok;
2395         update_stateid(&stp->st_stateid);
2396         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2397
2398         /* release_stateid() calls nfsd_close() if needed */
2399         release_stateid(stp, OPEN_STATE);
2400
2401         /* place unused nfs4_stateowners on so_close_lru list to be
2402          * released by the laundromat service after the lease period
2403          * to enable us to handle CLOSE replay
2404          */
2405         if (list_empty(&close->cl_stateowner->so_stateids))
2406                 move_to_close_lru(close->cl_stateowner);
2407 out:
2408         if (close->cl_stateowner) {
2409                 nfs4_get_stateowner(close->cl_stateowner);
2410                 cstate->replay_owner = close->cl_stateowner;
2411         }
2412         nfs4_unlock_state();
2413         return status;
2414 }
2415
2416 __be32
2417 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2418                   struct nfsd4_delegreturn *dr)
2419 {
2420         __be32 status;
2421
2422         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2423                 goto out;
2424
2425         nfs4_lock_state();
2426         status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2427                                             &dr->dr_stateid, DELEG_RET, NULL);
2428         nfs4_unlock_state();
2429 out:
2430         return status;
2431 }
2432
2433
2434 /*
2435  * Lock owner state (byte-range locks)
2436  */
2437 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2438 #define LOCK_HASH_BITS              8
2439 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2440 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2441
2442 #define lockownerid_hashval(id) \
2443         ((id) & LOCK_HASH_MASK)
2444
2445 static inline unsigned int
2446 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2447                 struct xdr_netobj *ownername)
2448 {
2449         return (file_hashval(inode) + cl_id
2450                         + opaque_hashval(ownername->data, ownername->len))
2451                 & LOCK_HASH_MASK;
2452 }
2453
2454 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2455 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2456 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2457
2458 static struct nfs4_stateid *
2459 find_stateid(stateid_t *stid, int flags)
2460 {
2461         struct nfs4_stateid *local = NULL;
2462         u32 st_id = stid->si_stateownerid;
2463         u32 f_id = stid->si_fileid;
2464         unsigned int hashval;
2465
2466         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2467         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2468                 hashval = stateid_hashval(st_id, f_id);
2469                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2470                         if ((local->st_stateid.si_stateownerid == st_id) &&
2471                             (local->st_stateid.si_fileid == f_id))
2472                                 return local;
2473                 }
2474         }
2475         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2476                 hashval = stateid_hashval(st_id, f_id);
2477                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2478                         if ((local->st_stateid.si_stateownerid == st_id) &&
2479                             (local->st_stateid.si_fileid == f_id))
2480                                 return local;
2481                 }
2482         }
2483         return NULL;
2484 }
2485
2486 static struct nfs4_delegation *
2487 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2488 {
2489         struct nfs4_file *fp;
2490         struct nfs4_delegation *dl;
2491
2492         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2493                     stid->si_boot, stid->si_stateownerid,
2494                     stid->si_fileid, stid->si_generation);
2495
2496         fp = find_file(ino);
2497         if (!fp)
2498                 return NULL;
2499         dl = find_delegation_file(fp, stid);
2500         put_nfs4_file(fp);
2501         return dl;
2502 }
2503
2504 /*
2505  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2506  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2507  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2508  * locking, this prevents us from being completely protocol-compliant.  The
2509  * real solution to this problem is to start using unsigned file offsets in
2510  * the VFS, but this is a very deep change!
2511  */
2512 static inline void
2513 nfs4_transform_lock_offset(struct file_lock *lock)
2514 {
2515         if (lock->fl_start < 0)
2516                 lock->fl_start = OFFSET_MAX;
2517         if (lock->fl_end < 0)
2518                 lock->fl_end = OFFSET_MAX;
2519 }
2520
2521 /* Hack!: For now, we're defining this just so we can use a pointer to it
2522  * as a unique cookie to identify our (NFSv4's) posix locks. */
2523 static struct lock_manager_operations nfsd_posix_mng_ops  = {
2524 };
2525
2526 static inline void
2527 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2528 {
2529         struct nfs4_stateowner *sop;
2530         unsigned int hval;
2531
2532         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2533                 sop = (struct nfs4_stateowner *) fl->fl_owner;
2534                 hval = lockownerid_hashval(sop->so_id);
2535                 kref_get(&sop->so_ref);
2536                 deny->ld_sop = sop;
2537                 deny->ld_clientid = sop->so_client->cl_clientid;
2538         } else {
2539                 deny->ld_sop = NULL;
2540                 deny->ld_clientid.cl_boot = 0;
2541                 deny->ld_clientid.cl_id = 0;
2542         }
2543         deny->ld_start = fl->fl_start;
2544         deny->ld_length = ~(u64)0;
2545         if (fl->fl_end != ~(u64)0)
2546                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2547         deny->ld_type = NFS4_READ_LT;
2548         if (fl->fl_type != F_RDLCK)
2549                 deny->ld_type = NFS4_WRITE_LT;
2550 }
2551
2552 static struct nfs4_stateowner *
2553 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2554                 struct xdr_netobj *owner)
2555 {
2556         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2557         struct nfs4_stateowner *op;
2558
2559         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2560                 if (cmp_owner_str(op, owner, clid))
2561                         return op;
2562         }
2563         return NULL;
2564 }
2565
2566 /*
2567  * Alloc a lock owner structure.
2568  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2569  * occured.
2570  *
2571  * strhashval = lock_ownerstr_hashval
2572  */
2573
2574 static struct nfs4_stateowner *
2575 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2576         struct nfs4_stateowner *sop;
2577         struct nfs4_replay *rp;
2578         unsigned int idhashval;
2579
2580         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2581                 return NULL;
2582         idhashval = lockownerid_hashval(current_ownerid);
2583         INIT_LIST_HEAD(&sop->so_idhash);
2584         INIT_LIST_HEAD(&sop->so_strhash);
2585         INIT_LIST_HEAD(&sop->so_perclient);
2586         INIT_LIST_HEAD(&sop->so_stateids);
2587         INIT_LIST_HEAD(&sop->so_perstateid);
2588         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2589         sop->so_time = 0;
2590         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2591         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2592         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2593         sop->so_is_open_owner = 0;
2594         sop->so_id = current_ownerid++;
2595         sop->so_client = clp;
2596         /* It is the openowner seqid that will be incremented in encode in the
2597          * case of new lockowners; so increment the lock seqid manually: */
2598         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2599         sop->so_confirmed = 1;
2600         rp = &sop->so_replay;
2601         rp->rp_status = nfserr_serverfault;
2602         rp->rp_buflen = 0;
2603         rp->rp_buf = rp->rp_ibuf;
2604         return sop;
2605 }
2606
2607 static struct nfs4_stateid *
2608 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2609 {
2610         struct nfs4_stateid *stp;
2611         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2612
2613         stp = nfs4_alloc_stateid();
2614         if (stp == NULL)
2615                 goto out;
2616         INIT_LIST_HEAD(&stp->st_hash);
2617         INIT_LIST_HEAD(&stp->st_perfile);
2618         INIT_LIST_HEAD(&stp->st_perstateowner);
2619         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2620         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2621         list_add(&stp->st_perfile, &fp->fi_stateids);
2622         list_add(&stp->st_perstateowner, &sop->so_stateids);
2623         stp->st_stateowner = sop;
2624         get_nfs4_file(fp);
2625         stp->st_file = fp;
2626         stp->st_stateid.si_boot = boot_time;
2627         stp->st_stateid.si_stateownerid = sop->so_id;
2628         stp->st_stateid.si_fileid = fp->fi_id;
2629         stp->st_stateid.si_generation = 0;
2630         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2631         stp->st_access_bmap = open_stp->st_access_bmap;
2632         stp->st_deny_bmap = open_stp->st_deny_bmap;
2633         stp->st_openstp = open_stp;
2634
2635 out:
2636         return stp;
2637 }
2638
2639 static int
2640 check_lock_length(u64 offset, u64 length)
2641 {
2642         return ((length == 0)  || ((length != ~(u64)0) &&
2643              LOFF_OVERFLOW(offset, length)));
2644 }
2645
2646 /*
2647  *  LOCK operation
2648  */
2649 __be32
2650 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2651            struct nfsd4_lock *lock)
2652 {
2653         struct nfs4_stateowner *open_sop = NULL;
2654         struct nfs4_stateowner *lock_sop = NULL;
2655         struct nfs4_stateid *lock_stp;
2656         struct file *filp;
2657         struct file_lock file_lock;
2658         struct file_lock conflock;
2659         __be32 status = 0;
2660         unsigned int strhashval;
2661         int err;
2662
2663         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2664                 (long long) lock->lk_offset,
2665                 (long long) lock->lk_length);
2666
2667         if (check_lock_length(lock->lk_offset, lock->lk_length))
2668                  return nfserr_inval;
2669
2670         if ((status = fh_verify(rqstp, &cstate->current_fh,
2671                                 S_IFREG, MAY_LOCK))) {
2672                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2673                 return status;
2674         }
2675
2676         nfs4_lock_state();
2677
2678         if (lock->lk_is_new) {
2679                 /*
2680                  * Client indicates that this is a new lockowner.
2681                  * Use open owner and open stateid to create lock owner and
2682                  * lock stateid.
2683                  */
2684                 struct nfs4_stateid *open_stp = NULL;
2685                 struct nfs4_file *fp;
2686
2687                 status = nfserr_stale_clientid;
2688                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2689                         goto out;
2690
2691                 /* validate and update open stateid and open seqid */
2692                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2693                                         lock->lk_new_open_seqid,
2694                                         &lock->lk_new_open_stateid,
2695                                         CHECK_FH | OPEN_STATE,
2696                                         &lock->lk_replay_owner, &open_stp,
2697                                         lock);
2698                 if (status)
2699                         goto out;
2700                 open_sop = lock->lk_replay_owner;
2701                 /* create lockowner and lock stateid */
2702                 fp = open_stp->st_file;
2703                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2704                                 open_sop->so_client->cl_clientid.cl_id,
2705                                 &lock->v.new.owner);
2706                 /* XXX: Do we need to check for duplicate stateowners on
2707                  * the same file, or should they just be allowed (and
2708                  * create new stateids)? */
2709                 status = nfserr_resource;
2710                 lock_sop = alloc_init_lock_stateowner(strhashval,
2711                                 open_sop->so_client, open_stp, lock);
2712                 if (lock_sop == NULL)
2713                         goto out;
2714                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2715                 if (lock_stp == NULL)
2716                         goto out;
2717         } else {
2718                 /* lock (lock owner + lock stateid) already exists */
2719                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2720                                        lock->lk_old_lock_seqid,
2721                                        &lock->lk_old_lock_stateid,
2722                                        CHECK_FH | LOCK_STATE,
2723                                        &lock->lk_replay_owner, &lock_stp, lock);
2724                 if (status)
2725                         goto out;
2726                 lock_sop = lock->lk_replay_owner;
2727         }
2728         /* lock->lk_replay_owner and lock_stp have been created or found */
2729         filp = lock_stp->st_vfs_file;
2730
2731         status = nfserr_grace;
2732         if (nfs4_in_grace() && !lock->lk_reclaim)
2733                 goto out;
2734         status = nfserr_no_grace;
2735         if (!nfs4_in_grace() && lock->lk_reclaim)
2736                 goto out;
2737
2738         locks_init_lock(&file_lock);
2739         switch (lock->lk_type) {
2740                 case NFS4_READ_LT:
2741                 case NFS4_READW_LT:
2742                         file_lock.fl_type = F_RDLCK;
2743                 break;
2744                 case NFS4_WRITE_LT:
2745                 case NFS4_WRITEW_LT:
2746                         file_lock.fl_type = F_WRLCK;
2747                 break;
2748                 default:
2749                         status = nfserr_inval;
2750                 goto out;
2751         }
2752         file_lock.fl_owner = (fl_owner_t)lock_sop;
2753         file_lock.fl_pid = current->tgid;
2754         file_lock.fl_file = filp;
2755         file_lock.fl_flags = FL_POSIX;
2756         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2757
2758         file_lock.fl_start = lock->lk_offset;
2759         if ((lock->lk_length == ~(u64)0) ||
2760                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2761                 file_lock.fl_end = ~(u64)0;
2762         else
2763                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2764         nfs4_transform_lock_offset(&file_lock);
2765
2766         /*
2767         * Try to lock the file in the VFS.
2768         * Note: locks.c uses the BKL to protect the inode's lock list.
2769         */
2770
2771         /* XXX?: Just to divert the locks_release_private at the start of
2772          * locks_copy_lock: */
2773         conflock.fl_ops = NULL;
2774         conflock.fl_lmops = NULL;
2775         err = posix_lock_file_conf(filp, &file_lock, &conflock);
2776         switch (-err) {
2777         case 0: /* success! */
2778                 update_stateid(&lock_stp->st_stateid);
2779                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2780                                 sizeof(stateid_t));
2781                 status = 0;
2782                 break;
2783         case (EAGAIN):          /* conflock holds conflicting lock */
2784                 status = nfserr_denied;
2785                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2786                 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2787                 break;
2788         case (EDEADLK):
2789                 status = nfserr_deadlock;
2790                 break;
2791         default:
2792                 dprintk("NFSD: nfsd4_lock: posix_lock_file_conf() failed! status %d\n",err);
2793                 status = nfserr_resource;
2794                 break;
2795         }
2796 out:
2797         if (status && lock->lk_is_new && lock_sop)
2798                 release_stateowner(lock_sop);
2799         if (lock->lk_replay_owner) {
2800                 nfs4_get_stateowner(lock->lk_replay_owner);
2801                 cstate->replay_owner = lock->lk_replay_owner;
2802         }
2803         nfs4_unlock_state();
2804         return status;
2805 }
2806
2807 /*
2808  * LOCKT operation
2809  */
2810 __be32
2811 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2812             struct nfsd4_lockt *lockt)
2813 {
2814         struct inode *inode;
2815         struct file file;
2816         struct file_lock file_lock;
2817         struct file_lock conflock;
2818         __be32 status;
2819
2820         if (nfs4_in_grace())
2821                 return nfserr_grace;
2822
2823         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2824                  return nfserr_inval;
2825
2826         lockt->lt_stateowner = NULL;
2827         nfs4_lock_state();
2828
2829         status = nfserr_stale_clientid;
2830         if (STALE_CLIENTID(&lockt->lt_clientid))
2831                 goto out;
2832
2833         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2834                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2835                 if (status == nfserr_symlink)
2836                         status = nfserr_inval;
2837                 goto out;
2838         }
2839
2840         inode = cstate->current_fh.fh_dentry->d_inode;
2841         locks_init_lock(&file_lock);
2842         switch (lockt->lt_type) {
2843                 case NFS4_READ_LT:
2844                 case NFS4_READW_LT:
2845                         file_lock.fl_type = F_RDLCK;
2846                 break;
2847                 case NFS4_WRITE_LT:
2848                 case NFS4_WRITEW_LT:
2849                         file_lock.fl_type = F_WRLCK;
2850                 break;
2851                 default:
2852                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2853                         status = nfserr_inval;
2854                 goto out;
2855         }
2856
2857         lockt->lt_stateowner = find_lockstateowner_str(inode,
2858                         &lockt->lt_clientid, &lockt->lt_owner);
2859         if (lockt->lt_stateowner)
2860                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2861         file_lock.fl_pid = current->tgid;
2862         file_lock.fl_flags = FL_POSIX;
2863         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2864
2865         file_lock.fl_start = lockt->lt_offset;
2866         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2867                 file_lock.fl_end = ~(u64)0;
2868         else
2869                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2870
2871         nfs4_transform_lock_offset(&file_lock);
2872
2873         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2874          * since LOCKT doesn't require an OPEN, and therefore a struct
2875          * file may not exist, pass posix_test_lock a struct file with
2876          * only the dentry:inode set.
2877          */
2878         memset(&file, 0, sizeof (struct file));
2879         file.f_path.dentry = cstate->current_fh.fh_dentry;
2880
2881         status = nfs_ok;
2882         if (posix_test_lock(&file, &file_lock, &conflock)) {
2883                 status = nfserr_denied;
2884                 nfs4_set_lock_denied(&conflock, &lockt->lt_denied);
2885         }
2886 out:
2887         nfs4_unlock_state();
2888         return status;
2889 }
2890
2891 __be32
2892 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2893             struct nfsd4_locku *locku)
2894 {
2895         struct nfs4_stateid *stp;
2896         struct file *filp = NULL;
2897         struct file_lock file_lock;
2898         __be32 status;
2899         int err;
2900
2901         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2902                 (long long) locku->lu_offset,
2903                 (long long) locku->lu_length);
2904
2905         if (check_lock_length(locku->lu_offset, locku->lu_length))
2906                  return nfserr_inval;
2907
2908         nfs4_lock_state();
2909
2910         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2911                                         locku->lu_seqid,
2912                                         &locku->lu_stateid,
2913                                         CHECK_FH | LOCK_STATE,
2914                                         &locku->lu_stateowner, &stp, NULL)))
2915                 goto out;
2916
2917         filp = stp->st_vfs_file;
2918         BUG_ON(!filp);
2919         locks_init_lock(&file_lock);
2920         file_lock.fl_type = F_UNLCK;
2921         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2922         file_lock.fl_pid = current->tgid;
2923         file_lock.fl_file = filp;
2924         file_lock.fl_flags = FL_POSIX;
2925         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2926         file_lock.fl_start = locku->lu_offset;
2927
2928         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2929                 file_lock.fl_end = ~(u64)0;
2930         else
2931                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2932         nfs4_transform_lock_offset(&file_lock);
2933
2934         /*
2935         *  Try to unlock the file in the VFS.
2936         */
2937         err = posix_lock_file(filp, &file_lock);
2938         if (err) {
2939                 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2940                 goto out_nfserr;
2941         }
2942         /*
2943         * OK, unlock succeeded; the only thing left to do is update the stateid.
2944         */
2945         update_stateid(&stp->st_stateid);
2946         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2947
2948 out:
2949         if (locku->lu_stateowner) {
2950                 nfs4_get_stateowner(locku->lu_stateowner);
2951                 cstate->replay_owner = locku->lu_stateowner;
2952         }
2953         nfs4_unlock_state();
2954         return status;
2955
2956 out_nfserr:
2957         status = nfserrno(err);
2958         goto out;
2959 }
2960
2961 /*
2962  * returns
2963  *      1: locks held by lockowner
2964  *      0: no locks held by lockowner
2965  */
2966 static int
2967 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2968 {
2969         struct file_lock **flpp;
2970         struct inode *inode = filp->f_path.dentry->d_inode;
2971         int status = 0;
2972
2973         lock_kernel();
2974         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2975                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2976                         status = 1;
2977                         goto out;
2978                 }
2979         }
2980 out:
2981         unlock_kernel();
2982         return status;
2983 }
2984
2985 __be32
2986 nfsd4_release_lockowner(struct svc_rqst *rqstp,
2987                         struct nfsd4_compound_state *cstate,
2988                         struct nfsd4_release_lockowner *rlockowner)
2989 {
2990         clientid_t *clid = &rlockowner->rl_clientid;
2991         struct nfs4_stateowner *sop;
2992         struct nfs4_stateid *stp;
2993         struct xdr_netobj *owner = &rlockowner->rl_owner;
2994         struct list_head matches;
2995         int i;
2996         __be32 status;
2997
2998         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2999                 clid->cl_boot, clid->cl_id);
3000
3001         /* XXX check for lease expiration */
3002
3003         status = nfserr_stale_clientid;
3004         if (STALE_CLIENTID(clid))
3005                 return status;
3006
3007         nfs4_lock_state();
3008
3009         status = nfserr_locks_held;
3010         /* XXX: we're doing a linear search through all the lockowners.
3011          * Yipes!  For now we'll just hope clients aren't really using
3012          * release_lockowner much, but eventually we have to fix these
3013          * data structures. */
3014         INIT_LIST_HEAD(&matches);
3015         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3016                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3017                         if (!cmp_owner_str(sop, owner, clid))
3018                                 continue;
3019                         list_for_each_entry(stp, &sop->so_stateids,
3020                                         st_perstateowner) {
3021                                 if (check_for_locks(stp->st_vfs_file, sop))
3022                                         goto out;
3023                                 /* Note: so_perclient unused for lockowners,
3024                                  * so it's OK to fool with here. */
3025                                 list_add(&sop->so_perclient, &matches);
3026                         }
3027                 }
3028         }
3029         /* Clients probably won't expect us to return with some (but not all)
3030          * of the lockowner state released; so don't release any until all
3031          * have been checked. */
3032         status = nfs_ok;
3033         while (!list_empty(&matches)) {
3034                 sop = list_entry(matches.next, struct nfs4_stateowner,
3035                                                                 so_perclient);
3036                 /* unhash_stateowner deletes so_perclient only
3037                  * for openowners. */
3038                 list_del(&sop->so_perclient);
3039                 release_stateowner(sop);
3040         }
3041 out:
3042         nfs4_unlock_state();
3043         return status;
3044 }
3045
3046 static inline struct nfs4_client_reclaim *
3047 alloc_reclaim(void)
3048 {
3049         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3050 }
3051
3052 int
3053 nfs4_has_reclaimed_state(const char *name)
3054 {
3055         unsigned int strhashval = clientstr_hashval(name);
3056         struct nfs4_client *clp;
3057
3058         clp = find_confirmed_client_by_str(name, strhashval);
3059         return clp ? 1 : 0;
3060 }
3061
3062 /*
3063  * failure => all reset bets are off, nfserr_no_grace...
3064  */
3065 int
3066 nfs4_client_to_reclaim(const char *name)
3067 {
3068         unsigned int strhashval;
3069         struct nfs4_client_reclaim *crp = NULL;
3070
3071         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3072         crp = alloc_reclaim();
3073         if (!crp)
3074                 return 0;
3075         strhashval = clientstr_hashval(name);
3076         INIT_LIST_HEAD(&crp->cr_strhash);
3077         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3078         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3079         reclaim_str_hashtbl_size++;
3080         return 1;
3081 }
3082
3083 static void
3084 nfs4_release_reclaim(void)
3085 {
3086         struct nfs4_client_reclaim *crp = NULL;
3087         int i;
3088
3089         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3090                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3091                         crp = list_entry(reclaim_str_hashtbl[i].next,
3092                                         struct nfs4_client_reclaim, cr_strhash);
3093                         list_del(&crp->cr_strhash);
3094                         kfree(crp);
3095                         reclaim_str_hashtbl_size--;
3096                 }
3097         }
3098         BUG_ON(reclaim_str_hashtbl_size);
3099 }
3100
3101 /*
3102  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3103 static struct nfs4_client_reclaim *
3104 nfs4_find_reclaim_client(clientid_t *clid)
3105 {
3106         unsigned int strhashval;
3107         struct nfs4_client *clp;
3108         struct nfs4_client_reclaim *crp = NULL;
3109
3110
3111         /* find clientid in conf_id_hashtbl */
3112         clp = find_confirmed_client(clid);
3113         if (clp == NULL)
3114                 return NULL;
3115
3116         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3117                             clp->cl_name.len, clp->cl_name.data,
3118                             clp->cl_recdir);
3119
3120         /* find clp->cl_name in reclaim_str_hashtbl */
3121         strhashval = clientstr_hashval(clp->cl_recdir);
3122         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3123                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3124                         return crp;
3125                 }
3126         }
3127         return NULL;
3128 }
3129
3130 /*
3131 * Called from OPEN. Look for clientid in reclaim list.
3132 */
3133 __be32
3134 nfs4_check_open_reclaim(clientid_t *clid)
3135 {
3136         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3137 }
3138
3139 /* initialization to perform at module load time: */
3140
3141 void
3142 nfs4_state_init(void)
3143 {
3144         int i;
3145
3146         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3147                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3148                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3149                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3150                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3151         }
3152         for (i = 0; i < FILE_HASH_SIZE; i++) {
3153                 INIT_LIST_HEAD(&file_hashtbl[i]);
3154         }
3155         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3156                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3157                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3158         }
3159         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3160                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3161                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3162         }
3163         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3164                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3165                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3166         }
3167         memset(&onestateid, ~0, sizeof(stateid_t));
3168         INIT_LIST_HEAD(&close_lru);
3169         INIT_LIST_HEAD(&client_lru);
3170         INIT_LIST_HEAD(&del_recall_lru);
3171         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3172                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3173         reclaim_str_hashtbl_size = 0;
3174 }
3175
3176 static void
3177 nfsd4_load_reboot_recovery_data(void)
3178 {
3179         int status;
3180
3181         nfs4_lock_state();
3182         nfsd4_init_recdir(user_recovery_dirname);
3183         status = nfsd4_recdir_load();
3184         nfs4_unlock_state();
3185         if (status)
3186                 printk("NFSD: Failure reading reboot recovery data\n");
3187 }
3188
3189 /* initialization to perform when the nfsd service is started: */
3190
3191 static void
3192 __nfs4_state_start(void)
3193 {
3194         time_t grace_time;
3195
3196         boot_time = get_seconds();
3197         grace_time = max(user_lease_time, lease_time);
3198         lease_time = user_lease_time;
3199         in_grace = 1;
3200         printk("NFSD: starting %ld-second grace period\n", grace_time);
3201         laundry_wq = create_singlethread_workqueue("nfsd4");
3202         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3203 }
3204
3205 int
3206 nfs4_state_start(void)
3207 {
3208         int status;
3209
3210         if (nfs4_init)
3211                 return 0;
3212         status = nfsd4_init_slabs();
3213         if (status)
3214                 return status;
3215         nfsd4_load_reboot_recovery_data();
3216         __nfs4_state_start();
3217         nfs4_init = 1;
3218         return 0;
3219 }
3220
3221 int
3222 nfs4_in_grace(void)
3223 {
3224         return in_grace;
3225 }
3226
3227 time_t
3228 nfs4_lease_time(void)
3229 {
3230         return lease_time;
3231 }
3232
3233 static void
3234 __nfs4_state_shutdown(void)
3235 {
3236         int i;
3237         struct nfs4_client *clp = NULL;
3238         struct nfs4_delegation *dp = NULL;
3239         struct list_head *pos, *next, reaplist;
3240
3241         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3242                 while (!list_empty(&conf_id_hashtbl[i])) {
3243                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3244                         expire_client(clp);
3245                 }
3246                 while (!list_empty(&unconf_str_hashtbl[i])) {
3247                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3248                         expire_client(clp);
3249                 }
3250         }
3251         INIT_LIST_HEAD(&reaplist);
3252         spin_lock(&recall_lock);
3253         list_for_each_safe(pos, next, &del_recall_lru) {
3254                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3255                 list_move(&dp->dl_recall_lru, &reaplist);
3256         }
3257         spin_unlock(&recall_lock);
3258         list_for_each_safe(pos, next, &reaplist) {
3259                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3260                 list_del_init(&dp->dl_recall_lru);
3261                 unhash_delegation(dp);
3262         }
3263
3264         cancel_delayed_work(&laundromat_work);
3265         nfsd4_shutdown_recdir();
3266         nfs4_init = 0;
3267 }
3268
3269 void
3270 nfs4_state_shutdown(void)
3271 {
3272         cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3273         destroy_workqueue(laundry_wq);
3274         nfs4_lock_state();
3275         nfs4_release_reclaim();
3276         __nfs4_state_shutdown();
3277         nfsd4_free_slabs();
3278         nfs4_unlock_state();
3279 }
3280
3281 static void
3282 nfs4_set_recdir(char *recdir)
3283 {
3284         nfs4_lock_state();
3285         strcpy(user_recovery_dirname, recdir);
3286         nfs4_unlock_state();
3287 }
3288
3289 /*
3290  * Change the NFSv4 recovery directory to recdir.
3291  */
3292 int
3293 nfs4_reset_recoverydir(char *recdir)
3294 {
3295         int status;
3296         struct nameidata nd;
3297
3298         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3299         if (status)
3300                 return status;
3301         status = -ENOTDIR;
3302         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3303                 nfs4_set_recdir(recdir);
3304                 status = 0;
3305         }
3306         path_release(&nd);
3307         return status;
3308 }
3309
3310 /*
3311  * Called when leasetime is changed.
3312  *
3313  * The only way the protocol gives us to handle on-the-fly lease changes is to
3314  * simulate a reboot.  Instead of doing that, we just wait till the next time
3315  * we start to register any changes in lease time.  If the administrator
3316  * really wants to change the lease time *now*, they can go ahead and bring
3317  * nfsd down and then back up again after changing the lease time.
3318  */
3319 void
3320 nfs4_reset_lease(time_t leasetime)
3321 {
3322         lock_kernel();
3323         user_lease_time = leasetime;
3324         unlock_kernel();
3325 }