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