fs/nfsd/nfs4state.c

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