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

   1 /*
   2 *  linux/fs/nfsd/nfs4state.c
   3 *
   4 *  Copyright (c) 2001 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson <kandros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 */
  36
  37 #include <linux/param.h>
  38 #include <linux/major.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/sunrpc/svc.h>
  42 #include <linux/nfsd/nfsd.h>
  43 #include <linux/nfsd/cache.h>
  44 #include <linux/mount.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/kthread.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfsd/state.h>
  50 #include <linux/nfsd/xdr4.h>
  51 #include <linux/namei.h>
  52
  53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  54
  55 /* Globals */
  56 static time_t lease_time = 90;     /* default lease time */
  57 static time_t user_lease_time = 90;
  58 static time_t boot_time;
  59 static int in_grace = 1;
  60 static u32 current_clientid = 1;
  61 static u32 current_ownerid = 1;
  62 static u32 current_fileid = 1;
  63 static u32 current_delegid = 1;
  64 static u32 nfs4_init;
  65 static stateid_t zerostateid;             /* bits all 0 */
  66 static stateid_t onestateid;              /* bits all 1 */
  67
  68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
  69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
  70
  71 /* forward declarations */
  72 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  73 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  74 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  75 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
  76 static void nfs4_set_recdir(char *recdir);
  77
  78 /* Locking:
  79  *
  80  * client_sema:
  81  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  82  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  83  */
  84 static DECLARE_MUTEX(client_sema);
  85
  86 static kmem_cache_t *stateowner_slab = NULL;
  87 static kmem_cache_t *file_slab = NULL;
  88 static kmem_cache_t *stateid_slab = NULL;
  89 static kmem_cache_t *deleg_slab = NULL;
  90
  91 void
  92 nfs4_lock_state(void)
  93 {
  94         down(&client_sema);
  95 }
  96
  97 void
  98 nfs4_unlock_state(void)
  99 {
 100         up(&client_sema);
 101 }
 102
 103 static inline u32
 104 opaque_hashval(const void *ptr, int nbytes)
 105 {
 106         unsigned char *cptr = (unsigned char *) ptr;
 107
 108         u32 x = 0;
 109         while (nbytes--) {
 110                 x *= 37;
 111                 x += *cptr++;
 112         }
 113         return x;
 114 }
 115
 116 /* forward declarations */
 117 static void release_stateowner(struct nfs4_stateowner *sop);
 118 static void release_stateid(struct nfs4_stateid *stp, int flags);
 119
 120 /*
 121  * Delegation state
 122  */
 123
 124 /* recall_lock protects the del_recall_lru */
 125 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
 126 static struct list_head del_recall_lru;
 127
 128 static void
 129 free_nfs4_file(struct kref *kref)
 130 {
 131         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 132         list_del(&fp->fi_hash);
 133         iput(fp->fi_inode);
 134         kmem_cache_free(file_slab, fp);
 135 }
 136
 137 static inline void
 138 put_nfs4_file(struct nfs4_file *fi)
 139 {
 140         kref_put(&fi->fi_ref, free_nfs4_file);
 141 }
 142
 143 static inline void
 144 get_nfs4_file(struct nfs4_file *fi)
 145 {
 146         kref_get(&fi->fi_ref);
 147 }
 148
 149 static struct nfs4_delegation *
 150 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 151 {
 152         struct nfs4_delegation *dp;
 153         struct nfs4_file *fp = stp->st_file;
 154         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 155
 156         dprintk("NFSD alloc_init_deleg\n");
 157         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 158         if (dp == NULL)
 159                 return dp;
 160         INIT_LIST_HEAD(&dp->dl_perfile);
 161         INIT_LIST_HEAD(&dp->dl_perclnt);
 162         INIT_LIST_HEAD(&dp->dl_recall_lru);
 163         dp->dl_client = clp;
 164         get_nfs4_file(fp);
 165         dp->dl_file = fp;
 166         dp->dl_flock = NULL;
 167         get_file(stp->st_vfs_file);
 168         dp->dl_vfs_file = stp->st_vfs_file;
 169         dp->dl_type = type;
 170         dp->dl_recall.cbr_dp = NULL;
 171         dp->dl_recall.cbr_ident = cb->cb_ident;
 172         dp->dl_recall.cbr_trunc = 0;
 173         dp->dl_stateid.si_boot = boot_time;
 174         dp->dl_stateid.si_stateownerid = current_delegid++;
 175         dp->dl_stateid.si_fileid = 0;
 176         dp->dl_stateid.si_generation = 0;
 177         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 178         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 179                         current_fh->fh_handle.fh_size);
 180         dp->dl_time = 0;
 181         atomic_set(&dp->dl_count, 1);
 182         list_add(&dp->dl_perfile, &fp->fi_delegations);
 183         list_add(&dp->dl_perclnt, &clp->cl_delegations);
 184         return dp;
 185 }
 186
 187 void
 188 nfs4_put_delegation(struct nfs4_delegation *dp)
 189 {
 190         if (atomic_dec_and_test(&dp->dl_count)) {
 191                 dprintk("NFSD: freeing dp %p\n",dp);
 192                 put_nfs4_file(dp->dl_file);
 193                 kmem_cache_free(deleg_slab, dp);
 194         }
 195 }
 196
 197 /* Remove the associated file_lock first, then remove the delegation.
 198  * lease_modify() is called to remove the FS_LEASE file_lock from
 199  * the i_flock list, eventually calling nfsd's lock_manager
 200  * fl_release_callback.
 201  */
 202 static void
 203 nfs4_close_delegation(struct nfs4_delegation *dp)
 204 {
 205         struct file *filp = dp->dl_vfs_file;
 206
 207         dprintk("NFSD: close_delegation dp %p\n",dp);
 208         dp->dl_vfs_file = NULL;
 209         /* The following nfsd_close may not actually close the file,
 210          * but we want to remove the lease in any case. */
 211         if (dp->dl_flock)
 212                 setlease(filp, F_UNLCK, &dp->dl_flock);
 213         nfsd_close(filp);
 214 }
 215
 216 /* Called under the state lock. */
 217 static void
 218 unhash_delegation(struct nfs4_delegation *dp)
 219 {
 220         list_del_init(&dp->dl_perfile);
 221         list_del_init(&dp->dl_perclnt);
 222         spin_lock(&recall_lock);
 223         list_del_init(&dp->dl_recall_lru);
 224         spin_unlock(&recall_lock);
 225         nfs4_close_delegation(dp);
 226         nfs4_put_delegation(dp);
 227 }
 228
 229 /*
 230  * SETCLIENTID state
 231  */
 232
 233 /* Hash tables for nfs4_clientid state */
 234 #define CLIENT_HASH_BITS                 4
 235 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 236 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 237
 238 #define clientid_hashval(id) \
 239         ((id) & CLIENT_HASH_MASK)
 240 #define clientstr_hashval(name) \
 241         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
 242 /*
 243  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 244  * used in reboot/reset lease grace period processing
 245  *
 246  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 247  * setclientid_confirmed info.
 248  *
 249  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 250  * setclientid info.
 251  *
 252  * client_lru holds client queue ordered by nfs4_client.cl_time
 253  * for lease renewal.
 254  *
 255  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 256  * for last close replay.
 257  */
 258 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 259 static int reclaim_str_hashtbl_size = 0;
 260 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 261 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 262 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 263 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 264 static struct list_head client_lru;
 265 static struct list_head close_lru;
 266
 267 static inline void
 268 renew_client(struct nfs4_client *clp)
 269 {
 270         /*
 271         * Move client to the end to the LRU list.
 272         */
 273         dprintk("renewing client (clientid %08x/%08x)\n",
 274                         clp->cl_clientid.cl_boot,
 275                         clp->cl_clientid.cl_id);
 276         list_move_tail(&clp->cl_lru, &client_lru);
 277         clp->cl_time = get_seconds();
 278 }
 279
 280 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 281 static int
 282 STALE_CLIENTID(clientid_t *clid)
 283 {
 284         if (clid->cl_boot == boot_time)
 285                 return 0;
 286         dprintk("NFSD stale clientid (%08x/%08x)\n",
 287                         clid->cl_boot, clid->cl_id);
 288         return 1;
 289 }
 290
 291 /*
 292  * XXX Should we use a slab cache ?
 293  * This type of memory management is somewhat inefficient, but we use it
 294  * anyway since SETCLIENTID is not a common operation.
 295  */
 296 static inline struct nfs4_client *
 297 alloc_client(struct xdr_netobj name)
 298 {
 299         struct nfs4_client *clp;
 300
 301         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 302                 memset(clp, 0, sizeof(*clp));
 303                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 304                         memcpy(clp->cl_name.data, name.data, name.len);
 305                         clp->cl_name.len = name.len;
 306                 }
 307                 else {
 308                         kfree(clp);
 309                         clp = NULL;
 310                 }
 311         }
 312         return clp;
 313 }
 314
 315 static inline void
 316 free_client(struct nfs4_client *clp)
 317 {
 318         if (clp->cl_cred.cr_group_info)
 319                 put_group_info(clp->cl_cred.cr_group_info);
 320         kfree(clp->cl_name.data);
 321         kfree(clp);
 322 }
 323
 324 void
 325 put_nfs4_client(struct nfs4_client *clp)
 326 {
 327         if (atomic_dec_and_test(&clp->cl_count))
 328                 free_client(clp);
 329 }
 330
 331 static void
 332 expire_client(struct nfs4_client *clp)
 333 {
 334         struct nfs4_stateowner *sop;
 335         struct nfs4_delegation *dp;
 336         struct nfs4_callback *cb = &clp->cl_callback;
 337         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 338         struct list_head reaplist;
 339
 340         dprintk("NFSD: expire_client cl_count %d\n",
 341                             atomic_read(&clp->cl_count));
 342
 343         /* shutdown rpc client, ending any outstanding recall rpcs */
 344         if (atomic_read(&cb->cb_set) == 1 && clnt) {
 345                 rpc_shutdown_client(clnt);
 346                 clnt = clp->cl_callback.cb_client = NULL;
 347         }
 348
 349         INIT_LIST_HEAD(&reaplist);
 350         spin_lock(&recall_lock);
 351         while (!list_empty(&clp->cl_delegations)) {
 352                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
 353                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 354                                 dp->dl_flock);
 355                 list_del_init(&dp->dl_perclnt);
 356                 list_move(&dp->dl_recall_lru, &reaplist);
 357         }
 358         spin_unlock(&recall_lock);
 359         while (!list_empty(&reaplist)) {
 360                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 361                 list_del_init(&dp->dl_recall_lru);
 362                 unhash_delegation(dp);
 363         }
 364         list_del(&clp->cl_idhash);
 365         list_del(&clp->cl_strhash);
 366         list_del(&clp->cl_lru);
 367         while (!list_empty(&clp->cl_openowners)) {
 368                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
 369                 release_stateowner(sop);
 370         }
 371         put_nfs4_client(clp);
 372 }
 373
 374 static struct nfs4_client *
 375 create_client(struct xdr_netobj name, char *recdir) {
 376         struct nfs4_client *clp;
 377
 378         if (!(clp = alloc_client(name)))
 379                 goto out;
 380         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 381         atomic_set(&clp->cl_count, 1);
 382         atomic_set(&clp->cl_callback.cb_set, 0);
 383         INIT_LIST_HEAD(&clp->cl_idhash);
 384         INIT_LIST_HEAD(&clp->cl_strhash);
 385         INIT_LIST_HEAD(&clp->cl_openowners);
 386         INIT_LIST_HEAD(&clp->cl_delegations);
 387         INIT_LIST_HEAD(&clp->cl_lru);
 388 out:
 389         return clp;
 390 }
 391
 392 static void
 393 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 394         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 395 }
 396
 397 static void
 398 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 399         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 400         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 401 }
 402
 403 static void
 404 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 405
 406         target->cr_uid = source->cr_uid;
 407         target->cr_gid = source->cr_gid;
 408         target->cr_group_info = source->cr_group_info;
 409         get_group_info(target->cr_group_info);
 410 }
 411
 412 static inline int
 413 same_name(const char *n1, const char *n2) {
 414         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 415 }
 416
 417 static int
 418 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 419         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 420 }
 421
 422 static int
 423 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 424         return((cl1->cl_boot == cl2->cl_boot) &&
 425                 (cl1->cl_id == cl2->cl_id));
 426 }
 427
 428 /* XXX what about NGROUP */
 429 static int
 430 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 431         return(cr1->cr_uid == cr2->cr_uid);
 432
 433 }
 434
 435 static void
 436 gen_clid(struct nfs4_client *clp) {
 437         clp->cl_clientid.cl_boot = boot_time;
 438         clp->cl_clientid.cl_id = current_clientid++;
 439 }
 440
 441 static void
 442 gen_confirm(struct nfs4_client *clp) {
 443         struct timespec         tv;
 444         u32 *                   p;
 445
 446         tv = CURRENT_TIME;
 447         p = (u32 *)clp->cl_confirm.data;
 448         *p++ = tv.tv_sec;
 449         *p++ = tv.tv_nsec;
 450 }
 451
 452 static int
 453 check_name(struct xdr_netobj name) {
 454
 455         if (name.len == 0)
 456                 return 0;
 457         if (name.len > NFS4_OPAQUE_LIMIT) {
 458                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 459                 return 0;
 460         }
 461         return 1;
 462 }
 463
 464 static void
 465 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 466 {
 467         unsigned int idhashval;
 468
 469         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 470         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 471         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 472         list_add_tail(&clp->cl_lru, &client_lru);
 473         clp->cl_time = get_seconds();
 474 }
 475
 476 static void
 477 move_to_confirmed(struct nfs4_client *clp)
 478 {
 479         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 480         unsigned int strhashval;
 481
 482         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 483         list_del_init(&clp->cl_strhash);
 484         list_del_init(&clp->cl_idhash);
 485         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 486         strhashval = clientstr_hashval(clp->cl_recdir);
 487         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 488         renew_client(clp);
 489 }
 490
 491 static struct nfs4_client *
 492 find_confirmed_client(clientid_t *clid)
 493 {
 494         struct nfs4_client *clp;
 495         unsigned int idhashval = clientid_hashval(clid->cl_id);
 496
 497         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 498                 if (cmp_clid(&clp->cl_clientid, clid))
 499                         return clp;
 500         }
 501         return NULL;
 502 }
 503
 504 static struct nfs4_client *
 505 find_unconfirmed_client(clientid_t *clid)
 506 {
 507         struct nfs4_client *clp;
 508         unsigned int idhashval = clientid_hashval(clid->cl_id);
 509
 510         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 511                 if (cmp_clid(&clp->cl_clientid, clid))
 512                         return clp;
 513         }
 514         return NULL;
 515 }
 516
 517 static struct nfs4_client *
 518 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 519 {
 520         struct nfs4_client *clp;
 521
 522         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 523                 if (same_name(clp->cl_recdir, dname))
 524                         return clp;
 525         }
 526         return NULL;
 527 }
 528
 529 static struct nfs4_client *
 530 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 531 {
 532         struct nfs4_client *clp;
 533
 534         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 535                 if (same_name(clp->cl_recdir, dname))
 536                         return clp;
 537         }
 538         return NULL;
 539 }
 540
 541 /* a helper function for parse_callback */
 542 static int
 543 parse_octet(unsigned int *lenp, char **addrp)
 544 {
 545         unsigned int len = *lenp;
 546         char *p = *addrp;
 547         int n = -1;
 548         char c;
 549
 550         for (;;) {
 551                 if (!len)
 552                         break;
 553                 len--;
 554                 c = *p++;
 555                 if (c == '.')
 556                         break;
 557                 if ((c < '0') || (c > '9')) {
 558                         n = -1;
 559                         break;
 560                 }
 561                 if (n < 0)
 562                         n = 0;
 563                 n = (n * 10) + (c - '0');
 564                 if (n > 255) {
 565                         n = -1;
 566                         break;
 567                 }
 568         }
 569         *lenp = len;
 570         *addrp = p;
 571         return n;
 572 }
 573
 574 /* parse and set the setclientid ipv4 callback address */
 575 static int
 576 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 577 {
 578         int temp = 0;
 579         u32 cbaddr = 0;
 580         u16 cbport = 0;
 581         u32 addrlen = addr_len;
 582         char *addr = addr_val;
 583         int i, shift;
 584
 585         /* ipaddress */
 586         shift = 24;
 587         for(i = 4; i > 0  ; i--) {
 588                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 589                         return 0;
 590                 }
 591                 cbaddr |= (temp << shift);
 592                 if (shift > 0)
 593                 shift -= 8;
 594         }
 595         *cbaddrp = cbaddr;
 596
 597         /* port */
 598         shift = 8;
 599         for(i = 2; i > 0  ; i--) {
 600                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 601                         return 0;
 602                 }
 603                 cbport |= (temp << shift);
 604                 if (shift > 0)
 605                         shift -= 8;
 606         }
 607         *cbportp = cbport;
 608         return 1;
 609 }
 610
 611 static void
 612 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 613 {
 614         struct nfs4_callback *cb = &clp->cl_callback;
 615
 616         /* Currently, we only support tcp for the callback channel */
 617         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 618                 goto out_err;
 619
 620         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 621                          &cb->cb_addr, &cb->cb_port)))
 622                 goto out_err;
 623         cb->cb_prog = se->se_callback_prog;
 624         cb->cb_ident = se->se_callback_ident;
 625         return;
 626 out_err:
 627         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 628                 "will not receive delegations\n",
 629                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 630
 631         return;
 632 }
 633
 634 /*
 635  * RFC 3010 has a complex implmentation description of processing a
 636  * SETCLIENTID request consisting of 5 bullets, labeled as
 637  * CASE0 - CASE4 below.
 638  *
 639  * NOTES:
 640  *      callback information will be processed in a future patch
 641  *
 642  *      an unconfirmed record is added when:
 643  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 644  *      CASE 1: confirmed record found with matching name, principal,
 645  *              verifier, and clientid.
 646  *      CASE 2: confirmed record found with matching name, principal,
 647  *              and there is no unconfirmed record with matching
 648  *              name and principal
 649  *
 650  *      an unconfirmed record is replaced when:
 651  *      CASE 3: confirmed record found with matching name, principal,
 652  *              and an unconfirmed record is found with matching
 653  *              name, principal, and with clientid and
 654  *              confirm that does not match the confirmed record.
 655  *      CASE 4: there is no confirmed record with matching name and
 656  *              principal. there is an unconfirmed record with
 657  *              matching name, principal.
 658  *
 659  *      an unconfirmed record is deleted when:
 660  *      CASE 1: an unconfirmed record that matches input name, verifier,
 661  *              and confirmed clientid.
 662  *      CASE 4: any unconfirmed records with matching name and principal
 663  *              that exist after an unconfirmed record has been replaced
 664  *              as described above.
 665  *
 666  */
 667 int
 668 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 669 {
 670         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 671         struct xdr_netobj       clname = {
 672                 .len = setclid->se_namelen,
 673                 .data = setclid->se_name,
 674         };
 675         nfs4_verifier           clverifier = setclid->se_verf;
 676         unsigned int            strhashval;
 677         struct nfs4_client      *conf, *unconf, *new;
 678         int                     status;
 679         char                    dname[HEXDIR_LEN];
 680
 681         status = nfserr_inval;
 682         if (!check_name(clname))
 683                 goto out;
 684
 685         status = nfs4_make_rec_clidname(dname, &clname);
 686         if (status)
 687                 goto out;
 688
 689         /*
 690          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 691          * We get here on a DRC miss.
 692          */
 693
 694         strhashval = clientstr_hashval(dname);
 695
 696         nfs4_lock_state();
 697         conf = find_confirmed_client_by_str(dname, strhashval);
 698         if (conf) {
 699                 /*
 700                  * CASE 0:
 701                  * clname match, confirmed, different principal
 702                  * or different ip_address
 703                  */
 704                 status = nfserr_clid_inuse;
 705                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
 706                                 || conf->cl_addr != ip_addr) {
 707                         printk("NFSD: setclientid: string in use by client"
 708                         "(clientid %08x/%08x)\n",
 709                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
 710                         goto out;
 711                 }
 712         }
 713         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 714         status = nfserr_resource;
 715         if (!conf) {
 716                 /*
 717                  * CASE 4:
 718                  * placed first, because it is the normal case.
 719                  */
 720                 if (unconf)
 721                         expire_client(unconf);
 722                 new = create_client(clname, dname);
 723                 if (new == NULL)
 724                         goto out;
 725                 copy_verf(new, &clverifier);
 726                 new->cl_addr = ip_addr;
 727                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 728                 gen_clid(new);
 729                 gen_confirm(new);
 730                 gen_callback(new, setclid);
 731                 add_to_unconfirmed(new, strhashval);
 732         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 733                 /*
 734                  * CASE 1:
 735                  * cl_name match, confirmed, principal match
 736                  * verifier match: probable callback update
 737                  *
 738                  * remove any unconfirmed nfs4_client with
 739                  * matching cl_name, cl_verifier, and cl_clientid
 740                  *
 741                  * create and insert an unconfirmed nfs4_client with same
 742                  * cl_name, cl_verifier, and cl_clientid as existing
 743                  * nfs4_client,  but with the new callback info and a
 744                  * new cl_confirm
 745                  */
 746                 if (unconf) {
 747                         /* Note this is removing unconfirmed {*x***},
 748                          * which is stronger than RFC recommended {vxc**}.
 749                          * This has the advantage that there is at most
 750                          * one {*x***} in either list at any time.
 751                          */
 752                         expire_client(unconf);
 753                 }
 754                 new = create_client(clname, dname);
 755                 if (new == NULL)
 756                         goto out;
 757                 copy_verf(new,&conf->cl_verifier);
 758                 new->cl_addr = ip_addr;
 759                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 760                 copy_clid(new, conf);
 761                 gen_confirm(new);
 762                 gen_callback(new, setclid);
 763                 add_to_unconfirmed(new,strhashval);
 764         } else if (!unconf) {
 765                 /*
 766                  * CASE 2:
 767                  * clname match, confirmed, principal match
 768                  * verfier does not match
 769                  * no unconfirmed. create a new unconfirmed nfs4_client
 770                  * using input clverifier, clname, and callback info
 771                  * and generate a new cl_clientid and cl_confirm.
 772                  */
 773                 new = create_client(clname, dname);
 774                 if (new == NULL)
 775                         goto out;
 776                 copy_verf(new,&clverifier);
 777                 new->cl_addr = ip_addr;
 778                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 779                 gen_clid(new);
 780                 gen_confirm(new);
 781                 gen_callback(new, setclid);
 782                 add_to_unconfirmed(new, strhashval);
 783         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 784                 /*
 785                  * CASE3:
 786                  * confirmed found (name, principal match)
 787                  * confirmed verifier does not match input clverifier
 788                  *
 789                  * unconfirmed found (name match)
 790                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 791                  *
 792                  * remove unconfirmed.
 793                  *
 794                  * create an unconfirmed nfs4_client
 795                  * with same cl_name as existing confirmed nfs4_client,
 796                  * but with new callback info, new cl_clientid,
 797                  * new cl_verifier and a new cl_confirm
 798                  */
 799                 expire_client(unconf);
 800                 new = create_client(clname, dname);
 801                 if (new == NULL)
 802                         goto out;
 803                 copy_verf(new,&clverifier);
 804                 new->cl_addr = ip_addr;
 805                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 806                 gen_clid(new);
 807                 gen_confirm(new);
 808                 gen_callback(new, setclid);
 809                 add_to_unconfirmed(new, strhashval);
 810         } else {
 811                 /* No cases hit !!! */
 812                 status = nfserr_inval;
 813                 goto out;
 814
 815         }
 816         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 817         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 818         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 819         status = nfs_ok;
 820 out:
 821         nfs4_unlock_state();
 822         return status;
 823 }
 824
 825
 826 /*
 827  * RFC 3010 has a complex implmentation description of processing a
 828  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 829  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 830  *
 831  * NOTE: callback information will be processed here in a future patch
 832  */
 833 int
 834 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 835 {
 836         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 837         struct nfs4_client *conf, *unconf;
 838         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 839         clientid_t * clid = &setclientid_confirm->sc_clientid;
 840         int status;
 841
 842         if (STALE_CLIENTID(clid))
 843                 return nfserr_stale_clientid;
 844         /*
 845          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 846          * We get here on a DRC miss.
 847          */
 848
 849         nfs4_lock_state();
 850
 851         conf = find_confirmed_client(clid);
 852         unconf = find_unconfirmed_client(clid);
 853
 854         status = nfserr_clid_inuse;
 855         if (conf && conf->cl_addr != ip_addr)
 856                 goto out;
 857         if (unconf && unconf->cl_addr != ip_addr)
 858                 goto out;
 859
 860         if ((conf && unconf) &&
 861             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 862             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 863             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 864             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 865                 /* CASE 1:
 866                 * unconf record that matches input clientid and input confirm.
 867                 * conf record that matches input clientid.
 868                 * conf and unconf records match names, verifiers
 869                 */
 870                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 871                         status = nfserr_clid_inuse;
 872                 else {
 873                         /* XXX: We just turn off callbacks until we can handle
 874                           * change request correctly. */
 875                         atomic_set(&conf->cl_callback.cb_set, 0);
 876                         gen_confirm(conf);
 877                         nfsd4_remove_clid_dir(unconf);
 878                         expire_client(unconf);
 879                         status = nfs_ok;
 880
 881                 }
 882         } else if ((conf && !unconf) ||
 883             ((conf && unconf) &&
 884              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 885               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 886                 /* CASE 2:
 887                  * conf record that matches input clientid.
 888                  * if unconf record matches input clientid, then
 889                  * unconf->cl_name or unconf->cl_verifier don't match the
 890                  * conf record.
 891                  */
 892                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
 893                         status = nfserr_clid_inuse;
 894                 else
 895                         status = nfs_ok;
 896         } else if (!conf && unconf
 897                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
 898                 /* CASE 3:
 899                  * conf record not found.
 900                  * unconf record found.
 901                  * unconf->cl_confirm matches input confirm
 902                  */
 903                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 904                         status = nfserr_clid_inuse;
 905                 } else {
 906                         unsigned int hash =
 907                                 clientstr_hashval(unconf->cl_recdir);
 908                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 909                                                                         hash);
 910                         if (conf) {
 911                                 nfsd4_remove_clid_dir(conf);
 912                                 expire_client(conf);
 913                         }
 914                         move_to_confirmed(unconf);
 915                         conf = unconf;
 916                         status = nfs_ok;
 917                 }
 918         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
 919             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
 920                                                                 &confirm)))) {
 921                 /* CASE 4:
 922                  * conf record not found, or if conf, conf->cl_confirm does not
 923                  * match input confirm.
 924                  * unconf record not found, or if unconf, unconf->cl_confirm
 925                  * does not match input confirm.
 926                  */
 927                 status = nfserr_stale_clientid;
 928         } else {
 929                 /* check that we have hit one of the cases...*/
 930                 status = nfserr_clid_inuse;
 931         }
 932 out:
 933         if (!status)
 934                 nfsd4_probe_callback(conf);
 935         nfs4_unlock_state();
 936         return status;
 937 }
 938
 939 /*
 940  * Open owner state (share locks)
 941  */
 942
 943 /* hash tables for nfs4_stateowner */
 944 #define OWNER_HASH_BITS              8
 945 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 946 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 947
 948 #define ownerid_hashval(id) \
 949         ((id) & OWNER_HASH_MASK)
 950 #define ownerstr_hashval(clientid, ownername) \
 951         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 952
 953 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 954 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 955
 956 /* hash table for nfs4_file */
 957 #define FILE_HASH_BITS                   8
 958 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 959 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 960 /* hash table for (open)nfs4_stateid */
 961 #define STATEID_HASH_BITS              10
 962 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 963 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 964
 965 #define file_hashval(x) \
 966         hash_ptr(x, FILE_HASH_BITS)
 967 #define stateid_hashval(owner_id, file_id)  \
 968         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 969
 970 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 971 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 972
 973 /* OPEN Share state helper functions */
 974 static inline struct nfs4_file *
 975 alloc_init_file(struct inode *ino)
 976 {
 977         struct nfs4_file *fp;
 978         unsigned int hashval = file_hashval(ino);
 979
 980         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 981         if (fp) {
 982                 kref_init(&fp->fi_ref);
 983                 INIT_LIST_HEAD(&fp->fi_hash);
 984                 INIT_LIST_HEAD(&fp->fi_stateids);
 985                 INIT_LIST_HEAD(&fp->fi_delegations);
 986                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 987                 fp->fi_inode = igrab(ino);
 988                 fp->fi_id = current_fileid++;
 989                 return fp;
 990         }
 991         return NULL;
 992 }
 993
 994 static void
 995 nfsd4_free_slab(kmem_cache_t **slab)
 996 {
 997         int status;
 998
 999         if (*slab == NULL)
1000                 return;
1001         status = kmem_cache_destroy(*slab);
1002         *slab = NULL;
1003         WARN_ON(status);
1004 }
1005
1006 static void
1007 nfsd4_free_slabs(void)
1008 {
1009         nfsd4_free_slab(&stateowner_slab);
1010         nfsd4_free_slab(&file_slab);
1011         nfsd4_free_slab(&stateid_slab);
1012         nfsd4_free_slab(&deleg_slab);
1013 }
1014
1015 static int
1016 nfsd4_init_slabs(void)
1017 {
1018         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1019                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1020         if (stateowner_slab == NULL)
1021                 goto out_nomem;
1022         file_slab = kmem_cache_create("nfsd4_files",
1023                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1024         if (file_slab == NULL)
1025                 goto out_nomem;
1026         stateid_slab = kmem_cache_create("nfsd4_stateids",
1027                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1028         if (stateid_slab == NULL)
1029                 goto out_nomem;
1030         deleg_slab = kmem_cache_create("nfsd4_delegations",
1031                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1032         if (deleg_slab == NULL)
1033                 goto out_nomem;
1034         return 0;
1035 out_nomem:
1036         nfsd4_free_slabs();
1037         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1038         return -ENOMEM;
1039 }
1040
1041 void
1042 nfs4_free_stateowner(struct kref *kref)
1043 {
1044         struct nfs4_stateowner *sop =
1045                 container_of(kref, struct nfs4_stateowner, so_ref);
1046         kfree(sop->so_owner.data);
1047         kmem_cache_free(stateowner_slab, sop);
1048 }
1049
1050 static inline struct nfs4_stateowner *
1051 alloc_stateowner(struct xdr_netobj *owner)
1052 {
1053         struct nfs4_stateowner *sop;
1054
1055         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1056                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1057                         memcpy(sop->so_owner.data, owner->data, owner->len);
1058                         sop->so_owner.len = owner->len;
1059                         kref_init(&sop->so_ref);
1060                         return sop;
1061                 }
1062                 kmem_cache_free(stateowner_slab, sop);
1063         }
1064         return NULL;
1065 }
1066
1067 static struct nfs4_stateowner *
1068 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1069         struct nfs4_stateowner *sop;
1070         struct nfs4_replay *rp;
1071         unsigned int idhashval;
1072
1073         if (!(sop = alloc_stateowner(&open->op_owner)))
1074                 return NULL;
1075         idhashval = ownerid_hashval(current_ownerid);
1076         INIT_LIST_HEAD(&sop->so_idhash);
1077         INIT_LIST_HEAD(&sop->so_strhash);
1078         INIT_LIST_HEAD(&sop->so_perclient);
1079         INIT_LIST_HEAD(&sop->so_stateids);
1080         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1081         INIT_LIST_HEAD(&sop->so_close_lru);
1082         sop->so_time = 0;
1083         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1084         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1085         list_add(&sop->so_perclient, &clp->cl_openowners);
1086         sop->so_is_open_owner = 1;
1087         sop->so_id = current_ownerid++;
1088         sop->so_client = clp;
1089         sop->so_seqid = open->op_seqid;
1090         sop->so_confirmed = 0;
1091         rp = &sop->so_replay;
1092         rp->rp_status = NFSERR_SERVERFAULT;
1093         rp->rp_buflen = 0;
1094         rp->rp_buf = rp->rp_ibuf;
1095         return sop;
1096 }
1097
1098 static void
1099 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1100 {
1101         struct nfs4_stateowner *lock_sop;
1102
1103         while (!list_empty(&open_stp->st_lockowners)) {
1104                 lock_sop = list_entry(open_stp->st_lockowners.next,
1105                                 struct nfs4_stateowner, so_perstateid);
1106                 /* list_del(&open_stp->st_lockowners);  */
1107                 BUG_ON(lock_sop->so_is_open_owner);
1108                 release_stateowner(lock_sop);
1109         }
1110 }
1111
1112 static void
1113 unhash_stateowner(struct nfs4_stateowner *sop)
1114 {
1115         struct nfs4_stateid *stp;
1116
1117         list_del(&sop->so_idhash);
1118         list_del(&sop->so_strhash);
1119         if (sop->so_is_open_owner)
1120                 list_del(&sop->so_perclient);
1121         list_del(&sop->so_perstateid);
1122         while (!list_empty(&sop->so_stateids)) {
1123                 stp = list_entry(sop->so_stateids.next,
1124                         struct nfs4_stateid, st_perstateowner);
1125                 if (sop->so_is_open_owner)
1126                         release_stateid(stp, OPEN_STATE);
1127                 else
1128                         release_stateid(stp, LOCK_STATE);
1129         }
1130 }
1131
1132 static void
1133 release_stateowner(struct nfs4_stateowner *sop)
1134 {
1135         unhash_stateowner(sop);
1136         list_del(&sop->so_close_lru);
1137         nfs4_put_stateowner(sop);
1138 }
1139
1140 static inline void
1141 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1142         struct nfs4_stateowner *sop = open->op_stateowner;
1143         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1144
1145         INIT_LIST_HEAD(&stp->st_hash);
1146         INIT_LIST_HEAD(&stp->st_perstateowner);
1147         INIT_LIST_HEAD(&stp->st_lockowners);
1148         INIT_LIST_HEAD(&stp->st_perfile);
1149         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1150         list_add(&stp->st_perstateowner, &sop->so_stateids);
1151         list_add(&stp->st_perfile, &fp->fi_stateids);
1152         stp->st_stateowner = sop;
1153         get_nfs4_file(fp);
1154         stp->st_file = fp;
1155         stp->st_stateid.si_boot = boot_time;
1156         stp->st_stateid.si_stateownerid = sop->so_id;
1157         stp->st_stateid.si_fileid = fp->fi_id;
1158         stp->st_stateid.si_generation = 0;
1159         stp->st_access_bmap = 0;
1160         stp->st_deny_bmap = 0;
1161         __set_bit(open->op_share_access, &stp->st_access_bmap);
1162         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1163         stp->st_openstp = NULL;
1164 }
1165
1166 static void
1167 release_stateid(struct nfs4_stateid *stp, int flags)
1168 {
1169         struct file *filp = stp->st_vfs_file;
1170
1171         list_del(&stp->st_hash);
1172         list_del(&stp->st_perfile);
1173         list_del(&stp->st_perstateowner);
1174         if (flags & OPEN_STATE) {
1175                 release_stateid_lockowners(stp);
1176                 stp->st_vfs_file = NULL;
1177                 nfsd_close(filp);
1178         } else if (flags & LOCK_STATE)
1179                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1180         put_nfs4_file(stp->st_file);
1181         kmem_cache_free(stateid_slab, stp);
1182         stp = NULL;
1183 }
1184
1185 static void
1186 move_to_close_lru(struct nfs4_stateowner *sop)
1187 {
1188         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1189
1190         unhash_stateowner(sop);
1191         list_add_tail(&sop->so_close_lru, &close_lru);
1192         sop->so_time = get_seconds();
1193 }
1194
1195 static void
1196 release_state_owner(struct nfs4_stateid *stp, int flag)
1197 {
1198         struct nfs4_stateowner *sop = stp->st_stateowner;
1199
1200         dprintk("NFSD: release_state_owner\n");
1201         release_stateid(stp, flag);
1202
1203         /* place unused nfs4_stateowners on so_close_lru list to be
1204          * released by the laundromat service after the lease period
1205          * to enable us to handle CLOSE replay
1206          */
1207         if (sop->so_confirmed && list_empty(&sop->so_stateids))
1208                 move_to_close_lru(sop);
1209 }
1210
1211 static int
1212 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1213         return ((sop->so_owner.len == owner->len) &&
1214          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1215           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1216 }
1217
1218 static struct nfs4_stateowner *
1219 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1220 {
1221         struct nfs4_stateowner *so = NULL;
1222
1223         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1224                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1225                         return so;
1226         }
1227         return NULL;
1228 }
1229
1230 /* search file_hashtbl[] for file */
1231 static struct nfs4_file *
1232 find_file(struct inode *ino)
1233 {
1234         unsigned int hashval = file_hashval(ino);
1235         struct nfs4_file *fp;
1236
1237         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1238                 if (fp->fi_inode == ino) {
1239                         get_nfs4_file(fp);
1240                         return fp;
1241                 }
1242         }
1243         return NULL;
1244 }
1245
1246 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1247 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1248
1249 static void
1250 set_access(unsigned int *access, unsigned long bmap) {
1251         int i;
1252
1253         *access = 0;
1254         for (i = 1; i < 4; i++) {
1255                 if (test_bit(i, &bmap))
1256                         *access |= i;
1257         }
1258 }
1259
1260 static void
1261 set_deny(unsigned int *deny, unsigned long bmap) {
1262         int i;
1263
1264         *deny = 0;
1265         for (i = 0; i < 4; i++) {
1266                 if (test_bit(i, &bmap))
1267                         *deny |= i ;
1268         }
1269 }
1270
1271 static int
1272 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1273         unsigned int access, deny;
1274
1275         set_access(&access, stp->st_access_bmap);
1276         set_deny(&deny, stp->st_deny_bmap);
1277         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1278                 return 0;
1279         return 1;
1280 }
1281
1282 /*
1283  * Called to check deny when READ with all zero stateid or
1284  * WRITE with all zero or all one stateid
1285  */
1286 static int
1287 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1288 {
1289         struct inode *ino = current_fh->fh_dentry->d_inode;
1290         struct nfs4_file *fp;
1291         struct nfs4_stateid *stp;
1292         int ret;
1293
1294         dprintk("NFSD: nfs4_share_conflict\n");
1295
1296         fp = find_file(ino);
1297         if (!fp)
1298                 return nfs_ok;
1299         ret = nfserr_locked;
1300         /* Search for conflicting share reservations */
1301         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1302                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1303                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1304                         goto out;
1305         }
1306         ret = nfs_ok;
1307 out:
1308         put_nfs4_file(fp);
1309         return ret;
1310 }
1311
1312 static inline void
1313 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1314 {
1315         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1316                 put_write_access(filp->f_dentry->d_inode);
1317                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1318         }
1319 }
1320
1321 /*
1322  * Recall a delegation
1323  */
1324 static int
1325 do_recall(void *__dp)
1326 {
1327         struct nfs4_delegation *dp = __dp;
1328
1329         daemonize("nfsv4-recall");
1330
1331         nfsd4_cb_recall(dp);
1332         return 0;
1333 }
1334
1335 /*
1336  * Spawn a thread to perform a recall on the delegation represented
1337  * by the lease (file_lock)
1338  *
1339  * Called from break_lease() with lock_kernel() held.
1340  * Note: we assume break_lease will only call this *once* for any given
1341  * lease.
1342  */
1343 static
1344 void nfsd_break_deleg_cb(struct file_lock *fl)
1345 {
1346         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1347         struct task_struct *t;
1348
1349         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1350         if (!dp)
1351                 return;
1352
1353         /* We're assuming the state code never drops its reference
1354          * without first removing the lease.  Since we're in this lease
1355          * callback (and since the lease code is serialized by the kernel
1356          * lock) we know the server hasn't removed the lease yet, we know
1357          * it's safe to take a reference: */
1358         atomic_inc(&dp->dl_count);
1359
1360         spin_lock(&recall_lock);
1361         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1362         spin_unlock(&recall_lock);
1363
1364         /* only place dl_time is set. protected by lock_kernel*/
1365         dp->dl_time = get_seconds();
1366
1367         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1368         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1369
1370         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1371         if (IS_ERR(t)) {
1372                 struct nfs4_client *clp = dp->dl_client;
1373
1374                 printk(KERN_INFO "NFSD: Callback thread failed for "
1375                         "for client (clientid %08x/%08x)\n",
1376                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1377                 nfs4_put_delegation(dp);
1378         }
1379 }
1380
1381 /*
1382  * The file_lock is being reapd.
1383  *
1384  * Called by locks_free_lock() with lock_kernel() held.
1385  */
1386 static
1387 void nfsd_release_deleg_cb(struct file_lock *fl)
1388 {
1389         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1390
1391         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1392
1393         if (!(fl->fl_flags & FL_LEASE) || !dp)
1394                 return;
1395         dp->dl_flock = NULL;
1396 }
1397
1398 /*
1399  * Set the delegation file_lock back pointer.
1400  *
1401  * Called from __setlease() with lock_kernel() held.
1402  */
1403 static
1404 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1405 {
1406         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1407
1408         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1409         if (!dp)
1410                 return;
1411         dp->dl_flock = new;
1412 }
1413
1414 /*
1415  * Called from __setlease() with lock_kernel() held
1416  */
1417 static
1418 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1419 {
1420         struct nfs4_delegation *onlistd =
1421                 (struct nfs4_delegation *)onlist->fl_owner;
1422         struct nfs4_delegation *tryd =
1423                 (struct nfs4_delegation *)try->fl_owner;
1424
1425         if (onlist->fl_lmops != try->fl_lmops)
1426                 return 0;
1427
1428         return onlistd->dl_client == tryd->dl_client;
1429 }
1430
1431
1432 static
1433 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1434 {
1435         if (arg & F_UNLCK)
1436                 return lease_modify(onlist, arg);
1437         else
1438                 return -EAGAIN;
1439 }
1440
1441 static struct lock_manager_operations nfsd_lease_mng_ops = {
1442         .fl_break = nfsd_break_deleg_cb,
1443         .fl_release_private = nfsd_release_deleg_cb,
1444         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1445         .fl_mylease = nfsd_same_client_deleg_cb,
1446         .fl_change = nfsd_change_deleg_cb,
1447 };
1448
1449
1450 /*
1451  * nfsd4_process_open1()
1452  *      lookup stateowner.
1453  *              found:
1454  *                      check confirmed
1455  *                              confirmed:
1456  *                                      check seqid
1457  *                              not confirmed:
1458  *                                      delete owner
1459  *                                      create new owner
1460  *              notfound:
1461  *                      verify clientid
1462  *                      create new owner
1463  *
1464  * called with nfs4_lock_state() held.
1465  */
1466 int
1467 nfsd4_process_open1(struct nfsd4_open *open)
1468 {
1469         int status;
1470         clientid_t *clientid = &open->op_clientid;
1471         struct nfs4_client *clp = NULL;
1472         unsigned int strhashval;
1473         struct nfs4_stateowner *sop = NULL;
1474
1475         status = nfserr_inval;
1476         if (!check_name(open->op_owner))
1477                 goto out;
1478
1479         if (STALE_CLIENTID(&open->op_clientid))
1480                 return nfserr_stale_clientid;
1481
1482         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1483         sop = find_openstateowner_str(strhashval, open);
1484         if (sop) {
1485                 open->op_stateowner = sop;
1486                 /* check for replay */
1487                 if (open->op_seqid == sop->so_seqid - 1){
1488                         if (sop->so_replay.rp_buflen)
1489                                 return NFSERR_REPLAY_ME;
1490                         else {
1491                                 /* The original OPEN failed so spectacularly
1492                                  * that we don't even have replay data saved!
1493                                  * Therefore, we have no choice but to continue
1494                                  * processing this OPEN; presumably, we'll
1495                                  * fail again for the same reason.
1496                                  */
1497                                 dprintk("nfsd4_process_open1:"
1498                                         " replay with no replay cache\n");
1499                                 goto renew;
1500                         }
1501                 } else if (sop->so_confirmed) {
1502                         if (open->op_seqid == sop->so_seqid)
1503                                 goto renew;
1504                         status = nfserr_bad_seqid;
1505                         goto out;
1506                 } else {
1507                         /* If we get here, we received an OPEN for an
1508                          * unconfirmed nfs4_stateowner. Since the seqid's are
1509                          * different, purge the existing nfs4_stateowner, and
1510                          * instantiate a new one.
1511                          */
1512                         clp = sop->so_client;
1513                         release_stateowner(sop);
1514                 }
1515         } else {
1516                 /* nfs4_stateowner not found.
1517                  * Verify clientid and instantiate new nfs4_stateowner.
1518                  * If verify fails this is presumably the result of the
1519                  * client's lease expiring.
1520                  */
1521                 status = nfserr_expired;
1522                 clp = find_confirmed_client(clientid);
1523                 if (clp == NULL)
1524                         goto out;
1525         }
1526         status = nfserr_resource;
1527         sop = alloc_init_open_stateowner(strhashval, clp, open);
1528         if (sop == NULL)
1529                 goto out;
1530         open->op_stateowner = sop;
1531 renew:
1532         status = nfs_ok;
1533         renew_client(sop->so_client);
1534 out:
1535         return status;
1536 }
1537
1538 static inline int
1539 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1540 {
1541         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1542                 return nfserr_openmode;
1543         else
1544                 return nfs_ok;
1545 }
1546
1547 static struct nfs4_delegation *
1548 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1549 {
1550         struct nfs4_delegation *dp;
1551
1552         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1553                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1554                         return dp;
1555         }
1556         return NULL;
1557 }
1558
1559 static int
1560 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1561                 struct nfs4_delegation **dp)
1562 {
1563         int flags;
1564         int status = nfserr_bad_stateid;
1565
1566         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1567         if (*dp == NULL)
1568                 goto out;
1569         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1570                                                 RD_STATE : WR_STATE;
1571         status = nfs4_check_delegmode(*dp, flags);
1572         if (status)
1573                 *dp = NULL;
1574 out:
1575         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1576                 return nfs_ok;
1577         if (status)
1578                 return status;
1579         open->op_stateowner->so_confirmed = 1;
1580         return nfs_ok;
1581 }
1582
1583 static int
1584 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1585 {
1586         struct nfs4_stateid *local;
1587         int status = nfserr_share_denied;
1588         struct nfs4_stateowner *sop = open->op_stateowner;
1589
1590         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1591                 /* ignore lock owners */
1592                 if (local->st_stateowner->so_is_open_owner == 0)
1593                         continue;
1594                 /* remember if we have seen this open owner */
1595                 if (local->st_stateowner == sop)
1596                         *stpp = local;
1597                 /* check for conflicting share reservations */
1598                 if (!test_share(local, open))
1599                         goto out;
1600         }
1601         status = 0;
1602 out:
1603         return status;
1604 }
1605
1606 static inline struct nfs4_stateid *
1607 nfs4_alloc_stateid(void)
1608 {
1609         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1610 }
1611
1612 static int
1613 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1614                 struct nfs4_delegation *dp,
1615                 struct svc_fh *cur_fh, int flags)
1616 {
1617         struct nfs4_stateid *stp;
1618
1619         stp = nfs4_alloc_stateid();
1620         if (stp == NULL)
1621                 return nfserr_resource;
1622
1623         if (dp) {
1624                 get_file(dp->dl_vfs_file);
1625                 stp->st_vfs_file = dp->dl_vfs_file;
1626         } else {
1627                 int status;
1628                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1629                                 &stp->st_vfs_file);
1630                 if (status) {
1631                         if (status == nfserr_dropit)
1632                                 status = nfserr_jukebox;
1633                         kmem_cache_free(stateid_slab, stp);
1634                         return status;
1635                 }
1636         }
1637         *stpp = stp;
1638         return 0;
1639 }
1640
1641 static inline int
1642 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1643                 struct nfsd4_open *open)
1644 {
1645         struct iattr iattr = {
1646                 .ia_valid = ATTR_SIZE,
1647                 .ia_size = 0,
1648         };
1649         if (!open->op_truncate)
1650                 return 0;
1651         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1652                 return -EINVAL;
1653         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1654 }
1655
1656 static int
1657 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1658 {
1659         struct file *filp = stp->st_vfs_file;
1660         struct inode *inode = filp->f_dentry->d_inode;
1661         unsigned int share_access;
1662         int status;
1663
1664         set_access(&share_access, stp->st_access_bmap);
1665         share_access = ~share_access;
1666         share_access &= open->op_share_access;
1667
1668         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1669                 return nfsd4_truncate(rqstp, cur_fh, open);
1670
1671         status = get_write_access(inode);
1672         if (status)
1673                 return nfserrno(status);
1674         status = nfsd4_truncate(rqstp, cur_fh, open);
1675         if (status) {
1676                 put_write_access(inode);
1677                 return status;
1678         }
1679         /* remember the open */
1680         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1681         set_bit(open->op_share_access, &stp->st_access_bmap);
1682         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1683
1684         return nfs_ok;
1685 }
1686
1687
1688 static void
1689 nfs4_set_claim_prev(struct nfsd4_open *open)
1690 {
1691         open->op_stateowner->so_confirmed = 1;
1692         open->op_stateowner->so_client->cl_firststate = 1;
1693 }
1694
1695 /*
1696  * Attempt to hand out a delegation.
1697  */
1698 static void
1699 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1700 {
1701         struct nfs4_delegation *dp;
1702         struct nfs4_stateowner *sop = stp->st_stateowner;
1703         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1704         struct file_lock fl, *flp = &fl;
1705         int status, flag = 0;
1706
1707         flag = NFS4_OPEN_DELEGATE_NONE;
1708         open->op_recall = 0;
1709         switch (open->op_claim_type) {
1710                 case NFS4_OPEN_CLAIM_PREVIOUS:
1711                         if (!atomic_read(&cb->cb_set))
1712                                 open->op_recall = 1;
1713                         flag = open->op_delegate_type;
1714                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1715                                 goto out;
1716                         break;
1717                 case NFS4_OPEN_CLAIM_NULL:
1718                         /* Let's not give out any delegations till everyone's
1719                          * had the chance to reclaim theirs.... */
1720                         if (nfs4_in_grace())
1721                                 goto out;
1722                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1723                                 goto out;
1724                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1725                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1726                         else
1727                                 flag = NFS4_OPEN_DELEGATE_READ;
1728                         break;
1729                 default:
1730                         goto out;
1731         }
1732
1733         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1734         if (dp == NULL) {
1735                 flag = NFS4_OPEN_DELEGATE_NONE;
1736                 goto out;
1737         }
1738         locks_init_lock(&fl);
1739         fl.fl_lmops = &nfsd_lease_mng_ops;
1740         fl.fl_flags = FL_LEASE;
1741         fl.fl_end = OFFSET_MAX;
1742         fl.fl_owner =  (fl_owner_t)dp;
1743         fl.fl_file = stp->st_vfs_file;
1744         fl.fl_pid = current->tgid;
1745
1746         /* setlease checks to see if delegation should be handed out.
1747          * the lock_manager callbacks fl_mylease and fl_change are used
1748          */
1749         if ((status = setlease(stp->st_vfs_file,
1750                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1751                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1752                 unhash_delegation(dp);
1753                 flag = NFS4_OPEN_DELEGATE_NONE;
1754                 goto out;
1755         }
1756
1757         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1758
1759         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1760                      dp->dl_stateid.si_boot,
1761                      dp->dl_stateid.si_stateownerid,
1762                      dp->dl_stateid.si_fileid,
1763                      dp->dl_stateid.si_generation);
1764 out:
1765         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1766                         && flag == NFS4_OPEN_DELEGATE_NONE
1767                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1768                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1769         open->op_delegate_type = flag;
1770 }
1771
1772 /*
1773  * called with nfs4_lock_state() held.
1774  */
1775 int
1776 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1777 {
1778         struct nfs4_file *fp = NULL;
1779         struct inode *ino = current_fh->fh_dentry->d_inode;
1780         struct nfs4_stateid *stp = NULL;
1781         struct nfs4_delegation *dp = NULL;
1782         int status;
1783
1784         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1785                 return nfserr_grace;
1786
1787         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1788                 return nfserr_no_grace;
1789
1790         status = nfserr_inval;
1791         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1792                 goto out;
1793         /*
1794          * Lookup file; if found, lookup stateid and check open request,
1795          * and check for delegations in the process of being recalled.
1796          * If not found, create the nfs4_file struct
1797          */
1798         fp = find_file(ino);
1799         if (fp) {
1800                 if ((status = nfs4_check_open(fp, open, &stp)))
1801                         goto out;
1802                 status = nfs4_check_deleg(fp, open, &dp);
1803                 if (status)
1804                         goto out;
1805         } else {
1806                 status = nfserr_bad_stateid;
1807                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1808                         goto out;
1809                 status = nfserr_resource;
1810                 fp = alloc_init_file(ino);
1811                 if (fp == NULL)
1812                         goto out;
1813         }
1814
1815         /*
1816          * OPEN the file, or upgrade an existing OPEN.
1817          * If truncate fails, the OPEN fails.
1818          */
1819         if (stp) {
1820                 /* Stateid was found, this is an OPEN upgrade */
1821                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1822                 if (status)
1823                         goto out;
1824                 update_stateid(&stp->st_stateid);
1825         } else {
1826                 /* Stateid was not found, this is a new OPEN */
1827                 int flags = 0;
1828                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1829                         flags = MAY_WRITE;
1830                 else
1831                         flags = MAY_READ;
1832                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1833                 if (status)
1834                         goto out;
1835                 init_stateid(stp, fp, open);
1836                 status = nfsd4_truncate(rqstp, current_fh, open);
1837                 if (status) {
1838                         release_stateid(stp, OPEN_STATE);
1839                         goto out;
1840                 }
1841         }
1842         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1843
1844         /*
1845         * Attempt to hand out a delegation. No error return, because the
1846         * OPEN succeeds even if we fail.
1847         */
1848         nfs4_open_delegation(current_fh, open, stp);
1849
1850         status = nfs_ok;
1851
1852         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1853                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1854                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1855 out:
1856         if (fp)
1857                 put_nfs4_file(fp);
1858         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1859                 nfs4_set_claim_prev(open);
1860         /*
1861         * To finish the open response, we just need to set the rflags.
1862         */
1863         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1864         if (!open->op_stateowner->so_confirmed)
1865                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1866
1867         return status;
1868 }
1869
1870 static struct workqueue_struct *laundry_wq;
1871 static struct work_struct laundromat_work;
1872 static void laundromat_main(void *);
1873 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1874
1875 int
1876 nfsd4_renew(clientid_t *clid)
1877 {
1878         struct nfs4_client *clp;
1879         int status;
1880
1881         nfs4_lock_state();
1882         dprintk("process_renew(%08x/%08x): starting\n",
1883                         clid->cl_boot, clid->cl_id);
1884         status = nfserr_stale_clientid;
1885         if (STALE_CLIENTID(clid))
1886                 goto out;
1887         clp = find_confirmed_client(clid);
1888         status = nfserr_expired;
1889         if (clp == NULL) {
1890                 /* We assume the client took too long to RENEW. */
1891                 dprintk("nfsd4_renew: clientid not found!\n");
1892                 goto out;
1893         }
1894         renew_client(clp);
1895         status = nfserr_cb_path_down;
1896         if (!list_empty(&clp->cl_delegations)
1897                         && !atomic_read(&clp->cl_callback.cb_set))
1898                 goto out;
1899         status = nfs_ok;
1900 out:
1901         nfs4_unlock_state();
1902         return status;
1903 }
1904
1905 static void
1906 end_grace(void)
1907 {
1908         dprintk("NFSD: end of grace period\n");
1909         nfsd4_recdir_purge_old();
1910         in_grace = 0;
1911 }
1912
1913 static time_t
1914 nfs4_laundromat(void)
1915 {
1916         struct nfs4_client *clp;
1917         struct nfs4_stateowner *sop;
1918         struct nfs4_delegation *dp;
1919         struct list_head *pos, *next, reaplist;
1920         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1921         time_t t, clientid_val = NFSD_LEASE_TIME;
1922         time_t u, test_val = NFSD_LEASE_TIME;
1923
1924         nfs4_lock_state();
1925
1926         dprintk("NFSD: laundromat service - starting\n");
1927         if (in_grace)
1928                 end_grace();
1929         list_for_each_safe(pos, next, &client_lru) {
1930                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1931                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1932                         t = clp->cl_time - cutoff;
1933                         if (clientid_val > t)
1934                                 clientid_val = t;
1935                         break;
1936                 }
1937                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1938                         clp->cl_clientid.cl_id);
1939                 nfsd4_remove_clid_dir(clp);
1940                 expire_client(clp);
1941         }
1942         INIT_LIST_HEAD(&reaplist);
1943         spin_lock(&recall_lock);
1944         list_for_each_safe(pos, next, &del_recall_lru) {
1945                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1946                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1947                         u = dp->dl_time - cutoff;
1948                         if (test_val > u)
1949                                 test_val = u;
1950                         break;
1951                 }
1952                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1953                                     dp, dp->dl_flock);
1954                 list_move(&dp->dl_recall_lru, &reaplist);
1955         }
1956         spin_unlock(&recall_lock);
1957         list_for_each_safe(pos, next, &reaplist) {
1958                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1959                 list_del_init(&dp->dl_recall_lru);
1960                 unhash_delegation(dp);
1961         }
1962         test_val = NFSD_LEASE_TIME;
1963         list_for_each_safe(pos, next, &close_lru) {
1964                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1965                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1966                         u = sop->so_time - cutoff;
1967                         if (test_val > u)
1968                                 test_val = u;
1969                         break;
1970                 }
1971                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1972                         sop->so_id);
1973                 list_del(&sop->so_close_lru);
1974                 nfs4_put_stateowner(sop);
1975         }
1976         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1977                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1978         nfs4_unlock_state();
1979         return clientid_val;
1980 }
1981
1982 void
1983 laundromat_main(void *not_used)
1984 {
1985         time_t t;
1986
1987         t = nfs4_laundromat();
1988         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1989         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1990 }
1991
1992 static struct nfs4_stateowner *
1993 search_close_lru(u32 st_id, int flags)
1994 {
1995         struct nfs4_stateowner *local = NULL;
1996
1997         if (flags & CLOSE_STATE) {
1998                 list_for_each_entry(local, &close_lru, so_close_lru) {
1999                         if (local->so_id == st_id)
2000                                 return local;
2001                 }
2002         }
2003         return NULL;
2004 }
2005
2006 static inline int
2007 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2008 {
2009         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2010 }
2011
2012 static int
2013 STALE_STATEID(stateid_t *stateid)
2014 {
2015         if (stateid->si_boot == boot_time)
2016                 return 0;
2017         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2018                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2019                 stateid->si_generation);
2020         return 1;
2021 }
2022
2023 static inline int
2024 access_permit_read(unsigned long access_bmap)
2025 {
2026         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2027                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2028                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2029 }
2030
2031 static inline int
2032 access_permit_write(unsigned long access_bmap)
2033 {
2034         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2035                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2036 }
2037
2038 static
2039 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2040 {
2041         int status = nfserr_openmode;
2042
2043         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2044                 goto out;
2045         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2046                 goto out;
2047         status = nfs_ok;
2048 out:
2049         return status;
2050 }
2051
2052 static inline int
2053 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2054 {
2055         /* Trying to call delegreturn with a special stateid? Yuch: */
2056         if (!(flags & (RD_STATE | WR_STATE)))
2057                 return nfserr_bad_stateid;
2058         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2059                 return nfs_ok;
2060         else if (nfs4_in_grace()) {
2061                 /* Answer in remaining cases depends on existance of
2062                  * conflicting state; so we must wait out the grace period. */
2063                 return nfserr_grace;
2064         } else if (flags & WR_STATE)
2065                 return nfs4_share_conflict(current_fh,
2066                                 NFS4_SHARE_DENY_WRITE);
2067         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2068                 return nfs4_share_conflict(current_fh,
2069                                 NFS4_SHARE_DENY_READ);
2070 }
2071
2072 /*
2073  * Allow READ/WRITE during grace period on recovered state only for files
2074  * that are not able to provide mandatory locking.
2075  */
2076 static inline int
2077 io_during_grace_disallowed(struct inode *inode, int flags)
2078 {
2079         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2080                 && MANDATORY_LOCK(inode);
2081 }
2082
2083 /*
2084 * Checks for stateid operations
2085 */
2086 int
2087 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2088 {
2089         struct nfs4_stateid *stp = NULL;
2090         struct nfs4_delegation *dp = NULL;
2091         stateid_t *stidp;
2092         struct inode *ino = current_fh->fh_dentry->d_inode;
2093         int status;
2094
2095         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2096                 stateid->si_boot, stateid->si_stateownerid,
2097                 stateid->si_fileid, stateid->si_generation);
2098         if (filpp)
2099                 *filpp = NULL;
2100
2101         if (io_during_grace_disallowed(ino, flags))
2102                 return nfserr_grace;
2103
2104         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2105                 return check_special_stateids(current_fh, stateid, flags);
2106
2107         /* STALE STATEID */
2108         status = nfserr_stale_stateid;
2109         if (STALE_STATEID(stateid))
2110                 goto out;
2111
2112         /* BAD STATEID */
2113         status = nfserr_bad_stateid;
2114         if (!stateid->si_fileid) { /* delegation stateid */
2115                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2116                         dprintk("NFSD: delegation stateid not found\n");
2117                         if (nfs4_in_grace())
2118                                 status = nfserr_grace;
2119                         goto out;
2120                 }
2121                 stidp = &dp->dl_stateid;
2122         } else { /* open or lock stateid */
2123                 if (!(stp = find_stateid(stateid, flags))) {
2124                         dprintk("NFSD: open or lock stateid not found\n");
2125                         if (nfs4_in_grace())
2126                                 status = nfserr_grace;
2127                         goto out;
2128                 }
2129                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2130                         goto out;
2131                 if (!stp->st_stateowner->so_confirmed)
2132                         goto out;
2133                 stidp = &stp->st_stateid;
2134         }
2135         if (stateid->si_generation > stidp->si_generation)
2136                 goto out;
2137
2138         /* OLD STATEID */
2139         status = nfserr_old_stateid;
2140         if (stateid->si_generation < stidp->si_generation)
2141                 goto out;
2142         if (stp) {
2143                 if ((status = nfs4_check_openmode(stp,flags)))
2144                         goto out;
2145                 renew_client(stp->st_stateowner->so_client);
2146                 if (filpp)
2147                         *filpp = stp->st_vfs_file;
2148         } else if (dp) {
2149                 if ((status = nfs4_check_delegmode(dp, flags)))
2150                         goto out;
2151                 renew_client(dp->dl_client);
2152                 if (flags & DELEG_RET)
2153                         unhash_delegation(dp);
2154                 if (filpp)
2155                         *filpp = dp->dl_vfs_file;
2156         }
2157         status = nfs_ok;
2158 out:
2159         return status;
2160 }
2161
2162 static inline int
2163 setlkflg (int type)
2164 {
2165         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2166                 RD_STATE : WR_STATE;
2167 }
2168
2169 /*
2170  * Checks for sequence id mutating operations.
2171  */
2172 static int
2173 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)
2174 {
2175         struct nfs4_stateid *stp;
2176         struct nfs4_stateowner *sop;
2177
2178         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2179                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2180                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2181                 stateid->si_generation);
2182
2183         *stpp = NULL;
2184         *sopp = NULL;
2185
2186         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2187                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2188                 return nfserr_bad_stateid;
2189         }
2190
2191         if (STALE_STATEID(stateid))
2192                 return nfserr_stale_stateid;
2193         /*
2194         * We return BAD_STATEID if filehandle doesn't match stateid,
2195         * the confirmed flag is incorrecly set, or the generation
2196         * number is incorrect.
2197         */
2198         stp = find_stateid(stateid, flags);
2199         if (stp == NULL) {
2200                 /*
2201                  * Also, we should make sure this isn't just the result of
2202                  * a replayed close:
2203                  */
2204                 sop = search_close_lru(stateid->si_stateownerid, flags);
2205                 if (sop == NULL)
2206                         return nfserr_bad_stateid;
2207                 *sopp = sop;
2208                 goto check_replay;
2209         }
2210
2211         if (lock) {
2212                 struct nfs4_stateowner *sop = stp->st_stateowner;
2213                 clientid_t *lockclid = &lock->v.new.clientid;
2214                 struct nfs4_client *clp = sop->so_client;
2215                 int lkflg = 0;
2216                 int status;
2217
2218                 lkflg = setlkflg(lock->lk_type);
2219
2220                 if (lock->lk_is_new) {
2221                        if (!sop->so_is_open_owner)
2222                                return nfserr_bad_stateid;
2223                        if (!cmp_clid(&clp->cl_clientid, lockclid))
2224                                return nfserr_bad_stateid;
2225                        /* stp is the open stateid */
2226                        status = nfs4_check_openmode(stp, lkflg);
2227                        if (status)
2228                                return status;
2229                } else {
2230                        /* stp is the lock stateid */
2231                        status = nfs4_check_openmode(stp->st_openstp, lkflg);
2232                        if (status)
2233                                return status;
2234                }
2235
2236         }
2237
2238         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2239                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2240                 return nfserr_bad_stateid;
2241         }
2242
2243         *stpp = stp;
2244         *sopp = sop = stp->st_stateowner;
2245
2246         /*
2247         *  We now validate the seqid and stateid generation numbers.
2248         *  For the moment, we ignore the possibility of
2249         *  generation number wraparound.
2250         */
2251         if (seqid != sop->so_seqid)
2252                 goto check_replay;
2253
2254         if (sop->so_confirmed && flags & CONFIRM) {
2255                 printk("NFSD: preprocess_seqid_op: expected"
2256                                 " unconfirmed stateowner!\n");
2257                 return nfserr_bad_stateid;
2258         }
2259         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2260                 printk("NFSD: preprocess_seqid_op: stateowner not"
2261                                 " confirmed yet!\n");
2262                 return nfserr_bad_stateid;
2263         }
2264         if (stateid->si_generation > stp->st_stateid.si_generation) {
2265                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2266                 return nfserr_bad_stateid;
2267         }
2268
2269         if (stateid->si_generation < stp->st_stateid.si_generation) {
2270                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2271                 return nfserr_old_stateid;
2272         }
2273         renew_client(sop->so_client);
2274         return nfs_ok;
2275
2276 check_replay:
2277         if (seqid == sop->so_seqid - 1) {
2278                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2279                 /* indicate replay to calling function */
2280                 return NFSERR_REPLAY_ME;
2281         }
2282         printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2283                         sop->so_seqid, seqid);
2284         *sopp = NULL;
2285         return nfserr_bad_seqid;
2286 }
2287
2288 int
2289 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2290 {
2291         int status;
2292         struct nfs4_stateowner *sop;
2293         struct nfs4_stateid *stp;
2294
2295         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2296                         (int)current_fh->fh_dentry->d_name.len,
2297                         current_fh->fh_dentry->d_name.name);
2298
2299         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2300                 goto out;
2301
2302         nfs4_lock_state();
2303
2304         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2305                                         &oc->oc_req_stateid,
2306                                         CHECK_FH | CONFIRM | OPEN_STATE,
2307                                         &oc->oc_stateowner, &stp, NULL)))
2308                 goto out;
2309
2310         sop = oc->oc_stateowner;
2311         sop->so_confirmed = 1;
2312         update_stateid(&stp->st_stateid);
2313         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2314         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2315                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2316                          stp->st_stateid.si_boot,
2317                          stp->st_stateid.si_stateownerid,
2318                          stp->st_stateid.si_fileid,
2319                          stp->st_stateid.si_generation);
2320
2321         nfsd4_create_clid_dir(sop->so_client);
2322 out:
2323         if (oc->oc_stateowner)
2324                 nfs4_get_stateowner(oc->oc_stateowner);
2325         nfs4_unlock_state();
2326         return status;
2327 }
2328
2329
2330 /*
2331  * unset all bits in union bitmap (bmap) that
2332  * do not exist in share (from successful OPEN_DOWNGRADE)
2333  */
2334 static void
2335 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2336 {
2337         int i;
2338         for (i = 1; i < 4; i++) {
2339                 if ((i & access) != i)
2340                         __clear_bit(i, bmap);
2341         }
2342 }
2343
2344 static void
2345 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2346 {
2347         int i;
2348         for (i = 0; i < 4; i++) {
2349                 if ((i & deny) != i)
2350                         __clear_bit(i, bmap);
2351         }
2352 }
2353
2354 int
2355 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2356 {
2357         int status;
2358         struct nfs4_stateid *stp;
2359         unsigned int share_access;
2360
2361         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2362                         (int)current_fh->fh_dentry->d_name.len,
2363                         current_fh->fh_dentry->d_name.name);
2364
2365         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2366                 return nfserr_inval;
2367
2368         nfs4_lock_state();
2369         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2370                                         &od->od_stateid,
2371                                         CHECK_FH | OPEN_STATE,
2372                                         &od->od_stateowner, &stp, NULL)))
2373                 goto out;
2374
2375         status = nfserr_inval;
2376         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2377                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2378                         stp->st_access_bmap, od->od_share_access);
2379                 goto out;
2380         }
2381         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2382                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2383                         stp->st_deny_bmap, od->od_share_deny);
2384                 goto out;
2385         }
2386         set_access(&share_access, stp->st_access_bmap);
2387         nfs4_file_downgrade(stp->st_vfs_file,
2388                             share_access & ~od->od_share_access);
2389
2390         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2391         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2392
2393         update_stateid(&stp->st_stateid);
2394         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2395         status = nfs_ok;
2396 out:
2397         if (od->od_stateowner)
2398                 nfs4_get_stateowner(od->od_stateowner);
2399         nfs4_unlock_state();
2400         return status;
2401 }
2402
2403 /*
2404  * nfs4_unlock_state() called after encode
2405  */
2406 int
2407 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2408 {
2409         int status;
2410         struct nfs4_stateid *stp;
2411
2412         dprintk("NFSD: nfsd4_close on file %.*s\n",
2413                         (int)current_fh->fh_dentry->d_name.len,
2414                         current_fh->fh_dentry->d_name.name);
2415
2416         nfs4_lock_state();
2417         /* check close_lru for replay */
2418         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2419                                         &close->cl_stateid,
2420                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2421                                         &close->cl_stateowner, &stp, NULL)))
2422                 goto out;
2423         /*
2424         *  Return success, but first update the stateid.
2425         */
2426         status = nfs_ok;
2427         update_stateid(&stp->st_stateid);
2428         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2429
2430         /* release_state_owner() calls nfsd_close() if needed */
2431         release_state_owner(stp, OPEN_STATE);
2432 out:
2433         if (close->cl_stateowner)
2434                 nfs4_get_stateowner(close->cl_stateowner);
2435         nfs4_unlock_state();
2436         return status;
2437 }
2438
2439 int
2440 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2441 {
2442         int status;
2443
2444         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2445                 goto out;
2446
2447         nfs4_lock_state();
2448         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2449         nfs4_unlock_state();
2450 out:
2451         return status;
2452 }
2453
2454
2455 /*
2456  * Lock owner state (byte-range locks)
2457  */
2458 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2459 #define LOCK_HASH_BITS              8
2460 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2461 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2462
2463 #define lockownerid_hashval(id) \
2464         ((id) & LOCK_HASH_MASK)
2465
2466 static inline unsigned int
2467 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2468                 struct xdr_netobj *ownername)
2469 {
2470         return (file_hashval(inode) + cl_id
2471                         + opaque_hashval(ownername->data, ownername->len))
2472                 & LOCK_HASH_MASK;
2473 }
2474
2475 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2476 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2477 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2478
2479 static struct nfs4_stateid *
2480 find_stateid(stateid_t *stid, int flags)
2481 {
2482         struct nfs4_stateid *local = NULL;
2483         u32 st_id = stid->si_stateownerid;
2484         u32 f_id = stid->si_fileid;
2485         unsigned int hashval;
2486
2487         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2488         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2489                 hashval = stateid_hashval(st_id, f_id);
2490                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2491                         if ((local->st_stateid.si_stateownerid == st_id) &&
2492                             (local->st_stateid.si_fileid == f_id))
2493                                 return local;
2494                 }
2495         }
2496         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2497                 hashval = stateid_hashval(st_id, f_id);
2498                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2499                         if ((local->st_stateid.si_stateownerid == st_id) &&
2500                             (local->st_stateid.si_fileid == f_id))
2501                                 return local;
2502                 }
2503         } else
2504                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2505         return NULL;
2506 }
2507
2508 static struct nfs4_delegation *
2509 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2510 {
2511         struct nfs4_file *fp;
2512         struct nfs4_delegation *dl;
2513
2514         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2515                     stid->si_boot, stid->si_stateownerid,
2516                     stid->si_fileid, stid->si_generation);
2517
2518         fp = find_file(ino);
2519         if (!fp)
2520                 return NULL;
2521         dl = find_delegation_file(fp, stid);
2522         put_nfs4_file(fp);
2523         return dl;
2524 }
2525
2526 /*
2527  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2528  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2529  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2530  * locking, this prevents us from being completely protocol-compliant.  The
2531  * real solution to this problem is to start using unsigned file offsets in
2532  * the VFS, but this is a very deep change!
2533  */
2534 static inline void
2535 nfs4_transform_lock_offset(struct file_lock *lock)
2536 {
2537         if (lock->fl_start < 0)
2538                 lock->fl_start = OFFSET_MAX;
2539         if (lock->fl_end < 0)
2540                 lock->fl_end = OFFSET_MAX;
2541 }
2542
2543 static int
2544 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2545 {
2546         struct nfs4_stateowner *local = NULL;
2547         int status = 0;
2548
2549         if (hashval >= LOCK_HASH_SIZE)
2550                 goto out;
2551         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2552                 if (local == sop) {
2553                         status = 1;
2554                         goto out;
2555                 }
2556         }
2557 out:
2558         return status;
2559 }
2560
2561
2562 static inline void
2563 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2564 {
2565         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2566         unsigned int hval = lockownerid_hashval(sop->so_id);
2567
2568         deny->ld_sop = NULL;
2569         if (nfs4_verify_lock_stateowner(sop, hval)) {
2570                 kref_get(&sop->so_ref);
2571                 deny->ld_sop = sop;
2572                 deny->ld_clientid = sop->so_client->cl_clientid;
2573         }
2574         deny->ld_start = fl->fl_start;
2575         deny->ld_length = ~(u64)0;
2576         if (fl->fl_end != ~(u64)0)
2577                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2578         deny->ld_type = NFS4_READ_LT;
2579         if (fl->fl_type != F_RDLCK)
2580                 deny->ld_type = NFS4_WRITE_LT;
2581 }
2582
2583 static struct nfs4_stateowner *
2584 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2585                 struct xdr_netobj *owner)
2586 {
2587         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2588         struct nfs4_stateowner *op;
2589
2590         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2591                 if (cmp_owner_str(op, owner, clid))
2592                         return op;
2593         }
2594         return NULL;
2595 }
2596
2597 /*
2598  * Alloc a lock owner structure.
2599  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2600  * occured.
2601  *
2602  * strhashval = lock_ownerstr_hashval
2603  */
2604
2605 static struct nfs4_stateowner *
2606 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2607         struct nfs4_stateowner *sop;
2608         struct nfs4_replay *rp;
2609         unsigned int idhashval;
2610
2611         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2612                 return NULL;
2613         idhashval = lockownerid_hashval(current_ownerid);
2614         INIT_LIST_HEAD(&sop->so_idhash);
2615         INIT_LIST_HEAD(&sop->so_strhash);
2616         INIT_LIST_HEAD(&sop->so_perclient);
2617         INIT_LIST_HEAD(&sop->so_stateids);
2618         INIT_LIST_HEAD(&sop->so_perstateid);
2619         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2620         sop->so_time = 0;
2621         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2622         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2623         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2624         sop->so_is_open_owner = 0;
2625         sop->so_id = current_ownerid++;
2626         sop->so_client = clp;
2627         sop->so_seqid = lock->lk_new_lock_seqid;
2628         sop->so_confirmed = 1;
2629         rp = &sop->so_replay;
2630         rp->rp_status = NFSERR_SERVERFAULT;
2631         rp->rp_buflen = 0;
2632         rp->rp_buf = rp->rp_ibuf;
2633         return sop;
2634 }
2635
2636 static struct nfs4_stateid *
2637 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2638 {
2639         struct nfs4_stateid *stp;
2640         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2641
2642         stp = nfs4_alloc_stateid();
2643         if (stp == NULL)
2644                 goto out;
2645         INIT_LIST_HEAD(&stp->st_hash);
2646         INIT_LIST_HEAD(&stp->st_perfile);
2647         INIT_LIST_HEAD(&stp->st_perstateowner);
2648         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2649         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2650         list_add(&stp->st_perfile, &fp->fi_stateids);
2651         list_add(&stp->st_perstateowner, &sop->so_stateids);
2652         stp->st_stateowner = sop;
2653         get_nfs4_file(fp);
2654         stp->st_file = fp;
2655         stp->st_stateid.si_boot = boot_time;
2656         stp->st_stateid.si_stateownerid = sop->so_id;
2657         stp->st_stateid.si_fileid = fp->fi_id;
2658         stp->st_stateid.si_generation = 0;
2659         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2660         stp->st_access_bmap = open_stp->st_access_bmap;
2661         stp->st_deny_bmap = open_stp->st_deny_bmap;
2662         stp->st_openstp = open_stp;
2663
2664 out:
2665         return stp;
2666 }
2667
2668 static int
2669 check_lock_length(u64 offset, u64 length)
2670 {
2671         return ((length == 0)  || ((length != ~(u64)0) &&
2672              LOFF_OVERFLOW(offset, length)));
2673 }
2674
2675 /*
2676  *  LOCK operation
2677  */
2678 int
2679 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2680 {
2681         struct nfs4_stateowner *open_sop = NULL;
2682         struct nfs4_stateid *lock_stp;
2683         struct file *filp;
2684         struct file_lock file_lock;
2685         struct file_lock *conflock;
2686         int status = 0;
2687         unsigned int strhashval;
2688
2689         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2690                 (long long) lock->lk_offset,
2691                 (long long) lock->lk_length);
2692
2693         if (check_lock_length(lock->lk_offset, lock->lk_length))
2694                  return nfserr_inval;
2695
2696         nfs4_lock_state();
2697
2698         if (lock->lk_is_new) {
2699                 /*
2700                  * Client indicates that this is a new lockowner.
2701                  * Use open owner and open stateid to create lock owner and
2702                  * lock stateid.
2703                  */
2704                 struct nfs4_stateid *open_stp = NULL;
2705                 struct nfs4_file *fp;
2706
2707                 status = nfserr_stale_clientid;
2708                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2709                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2710                         goto out;
2711                 }
2712
2713                 /* validate and update open stateid and open seqid */
2714                 status = nfs4_preprocess_seqid_op(current_fh,
2715                                         lock->lk_new_open_seqid,
2716                                         &lock->lk_new_open_stateid,
2717                                         CHECK_FH | OPEN_STATE,
2718                                         &open_sop, &open_stp, lock);
2719                 if (status)
2720                         goto out;
2721                 /* create lockowner and lock stateid */
2722                 fp = open_stp->st_file;
2723                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2724                                 open_sop->so_client->cl_clientid.cl_id,
2725                                 &lock->v.new.owner);
2726                 /* XXX: Do we need to check for duplicate stateowners on
2727                  * the same file, or should they just be allowed (and
2728                  * create new stateids)? */
2729                 status = nfserr_resource;
2730                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2731                         goto out;
2732                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2733                                                 fp, open_stp)) == NULL) {
2734                         release_stateowner(lock->lk_stateowner);
2735                         lock->lk_stateowner = NULL;
2736                         goto out;
2737                 }
2738                 /* bump the open seqid used to create the lock */
2739                 open_sop->so_seqid++;
2740         } else {
2741                 /* lock (lock owner + lock stateid) already exists */
2742                 status = nfs4_preprocess_seqid_op(current_fh,
2743                                        lock->lk_old_lock_seqid,
2744                                        &lock->lk_old_lock_stateid,
2745                                        CHECK_FH | LOCK_STATE,
2746                                        &lock->lk_stateowner, &lock_stp, lock);
2747                 if (status)
2748                         goto out;
2749         }
2750         /* lock->lk_stateowner and lock_stp have been created or found */
2751         filp = lock_stp->st_vfs_file;
2752
2753         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2754                 printk("NFSD: nfsd4_lock: permission denied!\n");
2755                 goto out;
2756         }
2757
2758         status = nfserr_grace;
2759         if (nfs4_in_grace() && !lock->lk_reclaim)
2760                 goto out;
2761         status = nfserr_no_grace;
2762         if (!nfs4_in_grace() && lock->lk_reclaim)
2763                 goto out;
2764
2765         locks_init_lock(&file_lock);
2766         switch (lock->lk_type) {
2767                 case NFS4_READ_LT:
2768                 case NFS4_READW_LT:
2769                         file_lock.fl_type = F_RDLCK;
2770                 break;
2771                 case NFS4_WRITE_LT:
2772                 case NFS4_WRITEW_LT:
2773                         file_lock.fl_type = F_WRLCK;
2774                 break;
2775                 default:
2776                         status = nfserr_inval;
2777                 goto out;
2778         }
2779         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2780         file_lock.fl_pid = current->tgid;
2781         file_lock.fl_file = filp;
2782         file_lock.fl_flags = FL_POSIX;
2783
2784         file_lock.fl_start = lock->lk_offset;
2785         if ((lock->lk_length == ~(u64)0) ||
2786                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2787                 file_lock.fl_end = ~(u64)0;
2788         else
2789                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2790         nfs4_transform_lock_offset(&file_lock);
2791
2792         /*
2793         * Try to lock the file in the VFS.
2794         * Note: locks.c uses the BKL to protect the inode's lock list.
2795         */
2796
2797         status = posix_lock_file(filp, &file_lock);
2798         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2799                 file_lock.fl_ops->fl_release_private(&file_lock);
2800         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2801         switch (-status) {
2802         case 0: /* success! */
2803                 update_stateid(&lock_stp->st_stateid);
2804                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2805                                 sizeof(stateid_t));
2806                 goto out;
2807         case (EAGAIN):
2808                 goto conflicting_lock;
2809         case (EDEADLK):
2810                 status = nfserr_deadlock;
2811         default:
2812                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2813                 goto out_destroy_new_stateid;
2814         }
2815
2816 conflicting_lock:
2817         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2818         status = nfserr_denied;
2819         /* XXX There is a race here. Future patch needed to provide
2820          * an atomic posix_lock_and_test_file
2821          */
2822         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2823                 status = nfserr_serverfault;
2824                 goto out;
2825         }
2826         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2827
2828 out_destroy_new_stateid:
2829         if (lock->lk_is_new) {
2830                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2831                 /*
2832                  * An error encountered after instantiation of the new
2833                  * stateid has forced us to destroy it.
2834                  */
2835                 if (!seqid_mutating_err(status))
2836                         open_sop->so_seqid--;
2837
2838                 release_state_owner(lock_stp, LOCK_STATE);
2839         }
2840 out:
2841         if (lock->lk_stateowner)
2842                 nfs4_get_stateowner(lock->lk_stateowner);
2843         nfs4_unlock_state();
2844         return status;
2845 }
2846
2847 /*
2848  * LOCKT operation
2849  */
2850 int
2851 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2852 {
2853         struct inode *inode;
2854         struct file file;
2855         struct file_lock file_lock;
2856         struct file_lock *conflicting_lock;
2857         int status;
2858
2859         if (nfs4_in_grace())
2860                 return nfserr_grace;
2861
2862         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2863                  return nfserr_inval;
2864
2865         lockt->lt_stateowner = NULL;
2866         nfs4_lock_state();
2867
2868         status = nfserr_stale_clientid;
2869         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2870                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2871                 goto out;
2872         }
2873
2874         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2875                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2876                 if (status == nfserr_symlink)
2877                         status = nfserr_inval;
2878                 goto out;
2879         }
2880
2881         inode = current_fh->fh_dentry->d_inode;
2882         locks_init_lock(&file_lock);
2883         switch (lockt->lt_type) {
2884                 case NFS4_READ_LT:
2885                 case NFS4_READW_LT:
2886                         file_lock.fl_type = F_RDLCK;
2887                 break;
2888                 case NFS4_WRITE_LT:
2889                 case NFS4_WRITEW_LT:
2890                         file_lock.fl_type = F_WRLCK;
2891                 break;
2892                 default:
2893                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2894                         status = nfserr_inval;
2895                 goto out;
2896         }
2897
2898         lockt->lt_stateowner = find_lockstateowner_str(inode,
2899                         &lockt->lt_clientid, &lockt->lt_owner);
2900         if (lockt->lt_stateowner)
2901                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2902         file_lock.fl_pid = current->tgid;
2903         file_lock.fl_flags = FL_POSIX;
2904
2905         file_lock.fl_start = lockt->lt_offset;
2906         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2907                 file_lock.fl_end = ~(u64)0;
2908         else
2909                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2910
2911         nfs4_transform_lock_offset(&file_lock);
2912
2913         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2914          * since LOCKT doesn't require an OPEN, and therefore a struct
2915          * file may not exist, pass posix_test_lock a struct file with
2916          * only the dentry:inode set.
2917          */
2918         memset(&file, 0, sizeof (struct file));
2919         file.f_dentry = current_fh->fh_dentry;
2920
2921         status = nfs_ok;
2922         conflicting_lock = posix_test_lock(&file, &file_lock);
2923         if (conflicting_lock) {
2924                 status = nfserr_denied;
2925                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2926         }
2927 out:
2928         nfs4_unlock_state();
2929         return status;
2930 }
2931
2932 int
2933 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2934 {
2935         struct nfs4_stateid *stp;
2936         struct file *filp = NULL;
2937         struct file_lock file_lock;
2938         int status;
2939
2940         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2941                 (long long) locku->lu_offset,
2942                 (long long) locku->lu_length);
2943
2944         if (check_lock_length(locku->lu_offset, locku->lu_length))
2945                  return nfserr_inval;
2946
2947         nfs4_lock_state();
2948
2949         if ((status = nfs4_preprocess_seqid_op(current_fh,
2950                                         locku->lu_seqid,
2951                                         &locku->lu_stateid,
2952                                         CHECK_FH | LOCK_STATE,
2953                                         &locku->lu_stateowner, &stp, NULL)))
2954                 goto out;
2955
2956         filp = stp->st_vfs_file;
2957         BUG_ON(!filp);
2958         locks_init_lock(&file_lock);
2959         file_lock.fl_type = F_UNLCK;
2960         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2961         file_lock.fl_pid = current->tgid;
2962         file_lock.fl_file = filp;
2963         file_lock.fl_flags = FL_POSIX;
2964         file_lock.fl_start = locku->lu_offset;
2965
2966         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2967                 file_lock.fl_end = ~(u64)0;
2968         else
2969                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2970         nfs4_transform_lock_offset(&file_lock);
2971
2972         /*
2973         *  Try to unlock the file in the VFS.
2974         */
2975         status = posix_lock_file(filp, &file_lock);
2976         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2977                 file_lock.fl_ops->fl_release_private(&file_lock);
2978         if (status) {
2979                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2980                 goto out_nfserr;
2981         }
2982         /*
2983         * OK, unlock succeeded; the only thing left to do is update the stateid.
2984         */
2985         update_stateid(&stp->st_stateid);
2986         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2987
2988 out:
2989         if (locku->lu_stateowner)
2990                 nfs4_get_stateowner(locku->lu_stateowner);
2991         nfs4_unlock_state();
2992         return status;
2993
2994 out_nfserr:
2995         status = nfserrno(status);
2996         goto out;
2997 }
2998
2999 /*
3000  * returns
3001  *      1: locks held by lockowner
3002  *      0: no locks held by lockowner
3003  */
3004 static int
3005 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3006 {
3007         struct file_lock **flpp;
3008         struct inode *inode = filp->f_dentry->d_inode;
3009         int status = 0;
3010
3011         lock_kernel();
3012         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3013                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3014                         status = 1;
3015                         goto out;
3016         }
3017 out:
3018         unlock_kernel();
3019         return status;
3020 }
3021
3022 int
3023 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3024 {
3025         clientid_t *clid = &rlockowner->rl_clientid;
3026         struct nfs4_stateowner *sop;
3027         struct nfs4_stateid *stp;
3028         struct xdr_netobj *owner = &rlockowner->rl_owner;
3029         struct list_head matches;
3030         int i;
3031         int status;
3032
3033         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3034                 clid->cl_boot, clid->cl_id);
3035
3036         /* XXX check for lease expiration */
3037
3038         status = nfserr_stale_clientid;
3039         if (STALE_CLIENTID(clid)) {
3040                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3041                 return status;
3042         }
3043
3044         nfs4_lock_state();
3045
3046         status = nfserr_locks_held;
3047         /* XXX: we're doing a linear search through all the lockowners.
3048          * Yipes!  For now we'll just hope clients aren't really using
3049          * release_lockowner much, but eventually we have to fix these
3050          * data structures. */
3051         INIT_LIST_HEAD(&matches);
3052         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3053                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3054                         if (!cmp_owner_str(sop, owner, clid))
3055                                 continue;
3056                         list_for_each_entry(stp, &sop->so_stateids,
3057                                         st_perstateowner) {
3058                                 if (check_for_locks(stp->st_vfs_file, sop))
3059                                         goto out;
3060                                 /* Note: so_perclient unused for lockowners,
3061                                  * so it's OK to fool with here. */
3062                                 list_add(&sop->so_perclient, &matches);
3063                         }
3064                 }
3065         }
3066         /* Clients probably won't expect us to return with some (but not all)
3067          * of the lockowner state released; so don't release any until all
3068          * have been checked. */
3069         status = nfs_ok;
3070         while (!list_empty(&matches)) {
3071                 sop = list_entry(matches.next, struct nfs4_stateowner,
3072                                                                 so_perclient);
3073                 /* unhash_stateowner deletes so_perclient only
3074                  * for openowners. */
3075                 list_del(&sop->so_perclient);
3076                 release_stateowner(sop);
3077         }
3078 out:
3079         nfs4_unlock_state();
3080         return status;
3081 }
3082
3083 static inline struct nfs4_client_reclaim *
3084 alloc_reclaim(void)
3085 {
3086         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3087 }
3088
3089 int
3090 nfs4_has_reclaimed_state(const char *name)
3091 {
3092         unsigned int strhashval = clientstr_hashval(name);
3093         struct nfs4_client *clp;
3094
3095         clp = find_confirmed_client_by_str(name, strhashval);
3096         return clp ? 1 : 0;
3097 }
3098
3099 /*
3100  * failure => all reset bets are off, nfserr_no_grace...
3101  */
3102 int
3103 nfs4_client_to_reclaim(const char *name)
3104 {
3105         unsigned int strhashval;
3106         struct nfs4_client_reclaim *crp = NULL;
3107
3108         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3109         crp = alloc_reclaim();
3110         if (!crp)
3111                 return 0;
3112         strhashval = clientstr_hashval(name);
3113         INIT_LIST_HEAD(&crp->cr_strhash);
3114         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3115         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3116         reclaim_str_hashtbl_size++;
3117         return 1;
3118 }
3119
3120 static void
3121 nfs4_release_reclaim(void)
3122 {
3123         struct nfs4_client_reclaim *crp = NULL;
3124         int i;
3125
3126         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3127                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3128                         crp = list_entry(reclaim_str_hashtbl[i].next,
3129                                         struct nfs4_client_reclaim, cr_strhash);
3130                         list_del(&crp->cr_strhash);
3131                         kfree(crp);
3132                         reclaim_str_hashtbl_size--;
3133                 }
3134         }
3135         BUG_ON(reclaim_str_hashtbl_size);
3136 }
3137
3138 /*
3139  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3140 static struct nfs4_client_reclaim *
3141 nfs4_find_reclaim_client(clientid_t *clid)
3142 {
3143         unsigned int strhashval;
3144         struct nfs4_client *clp;
3145         struct nfs4_client_reclaim *crp = NULL;
3146
3147
3148         /* find clientid in conf_id_hashtbl */
3149         clp = find_confirmed_client(clid);
3150         if (clp == NULL)
3151                 return NULL;
3152
3153         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3154                             clp->cl_name.len, clp->cl_name.data,
3155                             clp->cl_recdir);
3156
3157         /* find clp->cl_name in reclaim_str_hashtbl */
3158         strhashval = clientstr_hashval(clp->cl_recdir);
3159         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3160                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3161                         return crp;
3162                 }
3163         }
3164         return NULL;
3165 }
3166
3167 /*
3168 * Called from OPEN. Look for clientid in reclaim list.
3169 */
3170 int
3171 nfs4_check_open_reclaim(clientid_t *clid)
3172 {
3173         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3174 }
3175
3176 /* initialization to perform at module load time: */
3177
3178 void
3179 nfs4_state_init(void)
3180 {
3181         int i;
3182
3183         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3184                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3185                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3186                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3187                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3188         }
3189         for (i = 0; i < FILE_HASH_SIZE; i++) {
3190                 INIT_LIST_HEAD(&file_hashtbl[i]);
3191         }
3192         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3193                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3194                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3195         }
3196         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3197                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3198                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3199         }
3200         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3201                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3202                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3203         }
3204         memset(&onestateid, ~0, sizeof(stateid_t));
3205         INIT_LIST_HEAD(&close_lru);
3206         INIT_LIST_HEAD(&client_lru);
3207         INIT_LIST_HEAD(&del_recall_lru);
3208         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3209                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3210         reclaim_str_hashtbl_size = 0;
3211 }
3212
3213 static void
3214 nfsd4_load_reboot_recovery_data(void)
3215 {
3216         int status;
3217
3218         nfs4_lock_state();
3219         nfsd4_init_recdir(user_recovery_dirname);
3220         status = nfsd4_recdir_load();
3221         nfs4_unlock_state();
3222         if (status)
3223                 printk("NFSD: Failure reading reboot recovery data\n");
3224 }
3225
3226 /* initialization to perform when the nfsd service is started: */
3227
3228 static void
3229 __nfs4_state_start(void)
3230 {
3231         time_t grace_time;
3232
3233         boot_time = get_seconds();
3234         grace_time = max(user_lease_time, lease_time);
3235         lease_time = user_lease_time;
3236         in_grace = 1;
3237         printk("NFSD: starting %ld-second grace period\n", grace_time);
3238         laundry_wq = create_singlethread_workqueue("nfsd4");
3239         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3240 }
3241
3242 int
3243 nfs4_state_start(void)
3244 {
3245         int status;
3246
3247         if (nfs4_init)
3248                 return 0;
3249         status = nfsd4_init_slabs();
3250         if (status)
3251                 return status;
3252         nfsd4_load_reboot_recovery_data();
3253         __nfs4_state_start();
3254         nfs4_init = 1;
3255         return 0;
3256 }
3257
3258 int
3259 nfs4_in_grace(void)
3260 {
3261         return in_grace;
3262 }
3263
3264 time_t
3265 nfs4_lease_time(void)
3266 {
3267         return lease_time;
3268 }
3269
3270 static void
3271 __nfs4_state_shutdown(void)
3272 {
3273         int i;
3274         struct nfs4_client *clp = NULL;
3275         struct nfs4_delegation *dp = NULL;
3276         struct nfs4_stateowner *sop = NULL;
3277         struct list_head *pos, *next, reaplist;
3278
3279         list_for_each_safe(pos, next, &close_lru) {
3280                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3281                 list_del(&sop->so_close_lru);
3282                 nfs4_put_stateowner(sop);
3283         }
3284
3285         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3286                 while (!list_empty(&conf_id_hashtbl[i])) {
3287                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3288                         expire_client(clp);
3289                 }
3290                 while (!list_empty(&unconf_str_hashtbl[i])) {
3291                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3292                         expire_client(clp);
3293                 }
3294         }
3295         INIT_LIST_HEAD(&reaplist);
3296         spin_lock(&recall_lock);
3297         list_for_each_safe(pos, next, &del_recall_lru) {
3298                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3299                 list_move(&dp->dl_recall_lru, &reaplist);
3300         }
3301         spin_unlock(&recall_lock);
3302         list_for_each_safe(pos, next, &reaplist) {
3303                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3304                 list_del_init(&dp->dl_recall_lru);
3305                 unhash_delegation(dp);
3306         }
3307
3308         cancel_delayed_work(&laundromat_work);
3309         flush_workqueue(laundry_wq);
3310         destroy_workqueue(laundry_wq);
3311         nfsd4_shutdown_recdir();
3312         nfs4_init = 0;
3313 }
3314
3315 void
3316 nfs4_state_shutdown(void)
3317 {
3318         nfs4_lock_state();
3319         nfs4_release_reclaim();
3320         __nfs4_state_shutdown();
3321         nfsd4_free_slabs();
3322         nfs4_unlock_state();
3323 }
3324
3325 static void
3326 nfs4_set_recdir(char *recdir)
3327 {
3328         nfs4_lock_state();
3329         strcpy(user_recovery_dirname, recdir);
3330         nfs4_unlock_state();
3331 }
3332
3333 /*
3334  * Change the NFSv4 recovery directory to recdir.
3335  */
3336 int
3337 nfs4_reset_recoverydir(char *recdir)
3338 {
3339         int status;
3340         struct nameidata nd;
3341
3342         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3343         if (status)
3344                 return status;
3345         status = -ENOTDIR;
3346         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3347                 nfs4_set_recdir(recdir);
3348                 status = 0;
3349         }
3350         path_release(&nd);
3351         return status;
3352 }
3353
3354 /*
3355  * Called when leasetime is changed.
3356  *
3357  * The only way the protocol gives us to handle on-the-fly lease changes is to
3358  * simulate a reboot.  Instead of doing that, we just wait till the next time
3359  * we start to register any changes in lease time.  If the administrator
3360  * really wants to change the lease time *now*, they can go ahead and bring
3361  * nfsd down and then back up again after changing the lease time.
3362  */
3363 void
3364 nfs4_reset_lease(time_t leasetime)
3365 {
3366         lock_kernel();
3367         user_lease_time = leasetime;
3368         unlock_kernel();
3369 }