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         dprintk(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         if (!check_name(clname))
 682                 return nfserr_inval;
 683
 684         status = nfs4_make_rec_clidname(dname, &clname);
 685         if (status)
 686                 return status;
 687
 688         /*
 689          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 690          * We get here on a DRC miss.
 691          */
 692
 693         strhashval = clientstr_hashval(dname);
 694
 695         nfs4_lock_state();
 696         conf = find_confirmed_client_by_str(dname, strhashval);
 697         if (conf) {
 698                 /*
 699                  * CASE 0:
 700                  * clname match, confirmed, different principal
 701                  * or different ip_address
 702                  */
 703                 status = nfserr_clid_inuse;
 704                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
 705                                 || conf->cl_addr != ip_addr) {
 706                         printk("NFSD: setclientid: string in use by client"
 707                         "(clientid %08x/%08x)\n",
 708                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
 709                         goto out;
 710                 }
 711         }
 712         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 713         status = nfserr_resource;
 714         if (!conf) {
 715                 /*
 716                  * CASE 4:
 717                  * placed first, because it is the normal case.
 718                  */
 719                 if (unconf)
 720                         expire_client(unconf);
 721                 new = create_client(clname, dname);
 722                 if (new == NULL)
 723                         goto out;
 724                 copy_verf(new, &clverifier);
 725                 new->cl_addr = ip_addr;
 726                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 727                 gen_clid(new);
 728                 gen_confirm(new);
 729                 gen_callback(new, setclid);
 730                 add_to_unconfirmed(new, strhashval);
 731         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 732                 /*
 733                  * CASE 1:
 734                  * cl_name match, confirmed, principal match
 735                  * verifier match: probable callback update
 736                  *
 737                  * remove any unconfirmed nfs4_client with
 738                  * matching cl_name, cl_verifier, and cl_clientid
 739                  *
 740                  * create and insert an unconfirmed nfs4_client with same
 741                  * cl_name, cl_verifier, and cl_clientid as existing
 742                  * nfs4_client,  but with the new callback info and a
 743                  * new cl_confirm
 744                  */
 745                 if (unconf) {
 746                         /* Note this is removing unconfirmed {*x***},
 747                          * which is stronger than RFC recommended {vxc**}.
 748                          * This has the advantage that there is at most
 749                          * one {*x***} in either list at any time.
 750                          */
 751                         expire_client(unconf);
 752                 }
 753                 new = create_client(clname, dname);
 754                 if (new == NULL)
 755                         goto out;
 756                 copy_verf(new,&conf->cl_verifier);
 757                 new->cl_addr = ip_addr;
 758                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 759                 copy_clid(new, conf);
 760                 gen_confirm(new);
 761                 gen_callback(new, setclid);
 762                 add_to_unconfirmed(new,strhashval);
 763         } else if (!unconf) {
 764                 /*
 765                  * CASE 2:
 766                  * clname match, confirmed, principal match
 767                  * verfier does not match
 768                  * no unconfirmed. create a new unconfirmed nfs4_client
 769                  * using input clverifier, clname, and callback info
 770                  * and generate a new cl_clientid and cl_confirm.
 771                  */
 772                 new = create_client(clname, dname);
 773                 if (new == NULL)
 774                         goto out;
 775                 copy_verf(new,&clverifier);
 776                 new->cl_addr = ip_addr;
 777                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 778                 gen_clid(new);
 779                 gen_confirm(new);
 780                 gen_callback(new, setclid);
 781                 add_to_unconfirmed(new, strhashval);
 782         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 783                 /*
 784                  * CASE3:
 785                  * confirmed found (name, principal match)
 786                  * confirmed verifier does not match input clverifier
 787                  *
 788                  * unconfirmed found (name match)
 789                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 790                  *
 791                  * remove unconfirmed.
 792                  *
 793                  * create an unconfirmed nfs4_client
 794                  * with same cl_name as existing confirmed nfs4_client,
 795                  * but with new callback info, new cl_clientid,
 796                  * new cl_verifier and a new cl_confirm
 797                  */
 798                 expire_client(unconf);
 799                 new = create_client(clname, dname);
 800                 if (new == NULL)
 801                         goto out;
 802                 copy_verf(new,&clverifier);
 803                 new->cl_addr = ip_addr;
 804                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 805                 gen_clid(new);
 806                 gen_confirm(new);
 807                 gen_callback(new, setclid);
 808                 add_to_unconfirmed(new, strhashval);
 809         } else {
 810                 /* No cases hit !!! */
 811                 status = nfserr_inval;
 812                 goto out;
 813
 814         }
 815         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 816         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 817         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 818         status = nfs_ok;
 819 out:
 820         nfs4_unlock_state();
 821         return status;
 822 }
 823
 824
 825 /*
 826  * RFC 3010 has a complex implmentation description of processing a
 827  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 828  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 829  *
 830  * NOTE: callback information will be processed here in a future patch
 831  */
 832 int
 833 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 834 {
 835         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 836         struct nfs4_client *conf, *unconf;
 837         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 838         clientid_t * clid = &setclientid_confirm->sc_clientid;
 839         int status;
 840
 841         if (STALE_CLIENTID(clid))
 842                 return nfserr_stale_clientid;
 843         /*
 844          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 845          * We get here on a DRC miss.
 846          */
 847
 848         nfs4_lock_state();
 849
 850         conf = find_confirmed_client(clid);
 851         unconf = find_unconfirmed_client(clid);
 852
 853         status = nfserr_clid_inuse;
 854         if (conf && conf->cl_addr != ip_addr)
 855                 goto out;
 856         if (unconf && unconf->cl_addr != ip_addr)
 857                 goto out;
 858
 859         if ((conf && unconf) &&
 860             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 861             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 862             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 863             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 864                 /* CASE 1:
 865                 * unconf record that matches input clientid and input confirm.
 866                 * conf record that matches input clientid.
 867                 * conf and unconf records match names, verifiers
 868                 */
 869                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 870                         status = nfserr_clid_inuse;
 871                 else {
 872                         /* XXX: We just turn off callbacks until we can handle
 873                           * change request correctly. */
 874                         atomic_set(&conf->cl_callback.cb_set, 0);
 875                         gen_confirm(conf);
 876                         nfsd4_remove_clid_dir(unconf);
 877                         expire_client(unconf);
 878                         status = nfs_ok;
 879
 880                 }
 881         } else if ((conf && !unconf) ||
 882             ((conf && unconf) &&
 883              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 884               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 885                 /* CASE 2:
 886                  * conf record that matches input clientid.
 887                  * if unconf record matches input clientid, then
 888                  * unconf->cl_name or unconf->cl_verifier don't match the
 889                  * conf record.
 890                  */
 891                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
 892                         status = nfserr_clid_inuse;
 893                 else
 894                         status = nfs_ok;
 895         } else if (!conf && unconf
 896                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
 897                 /* CASE 3:
 898                  * conf record not found.
 899                  * unconf record found.
 900                  * unconf->cl_confirm matches input confirm
 901                  */
 902                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 903                         status = nfserr_clid_inuse;
 904                 } else {
 905                         unsigned int hash =
 906                                 clientstr_hashval(unconf->cl_recdir);
 907                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 908                                                                         hash);
 909                         if (conf) {
 910                                 nfsd4_remove_clid_dir(conf);
 911                                 expire_client(conf);
 912                         }
 913                         move_to_confirmed(unconf);
 914                         conf = unconf;
 915                         status = nfs_ok;
 916                 }
 917         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
 918             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
 919                                                                 &confirm)))) {
 920                 /* CASE 4:
 921                  * conf record not found, or if conf, conf->cl_confirm does not
 922                  * match input confirm.
 923                  * unconf record not found, or if unconf, unconf->cl_confirm
 924                  * does not match input confirm.
 925                  */
 926                 status = nfserr_stale_clientid;
 927         } else {
 928                 /* check that we have hit one of the cases...*/
 929                 status = nfserr_clid_inuse;
 930         }
 931 out:
 932         if (!status)
 933                 nfsd4_probe_callback(conf);
 934         nfs4_unlock_state();
 935         return status;
 936 }
 937
 938 /*
 939  * Open owner state (share locks)
 940  */
 941
 942 /* hash tables for nfs4_stateowner */
 943 #define OWNER_HASH_BITS              8
 944 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 945 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 946
 947 #define ownerid_hashval(id) \
 948         ((id) & OWNER_HASH_MASK)
 949 #define ownerstr_hashval(clientid, ownername) \
 950         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 951
 952 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 953 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 954
 955 /* hash table for nfs4_file */
 956 #define FILE_HASH_BITS                   8
 957 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 958 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 959 /* hash table for (open)nfs4_stateid */
 960 #define STATEID_HASH_BITS              10
 961 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 962 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 963
 964 #define file_hashval(x) \
 965         hash_ptr(x, FILE_HASH_BITS)
 966 #define stateid_hashval(owner_id, file_id)  \
 967         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 968
 969 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 970 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 971
 972 /* OPEN Share state helper functions */
 973 static inline struct nfs4_file *
 974 alloc_init_file(struct inode *ino)
 975 {
 976         struct nfs4_file *fp;
 977         unsigned int hashval = file_hashval(ino);
 978
 979         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 980         if (fp) {
 981                 kref_init(&fp->fi_ref);
 982                 INIT_LIST_HEAD(&fp->fi_hash);
 983                 INIT_LIST_HEAD(&fp->fi_stateids);
 984                 INIT_LIST_HEAD(&fp->fi_delegations);
 985                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 986                 fp->fi_inode = igrab(ino);
 987                 fp->fi_id = current_fileid++;
 988                 return fp;
 989         }
 990         return NULL;
 991 }
 992
 993 static void
 994 nfsd4_free_slab(kmem_cache_t **slab)
 995 {
 996         int status;
 997
 998         if (*slab == NULL)
 999                 return;
1000         status = kmem_cache_destroy(*slab);
1001         *slab = NULL;
1002         WARN_ON(status);
1003 }
1004
1005 static void
1006 nfsd4_free_slabs(void)
1007 {
1008         nfsd4_free_slab(&stateowner_slab);
1009         nfsd4_free_slab(&file_slab);
1010         nfsd4_free_slab(&stateid_slab);
1011         nfsd4_free_slab(&deleg_slab);
1012 }
1013
1014 static int
1015 nfsd4_init_slabs(void)
1016 {
1017         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1018                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1019         if (stateowner_slab == NULL)
1020                 goto out_nomem;
1021         file_slab = kmem_cache_create("nfsd4_files",
1022                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1023         if (file_slab == NULL)
1024                 goto out_nomem;
1025         stateid_slab = kmem_cache_create("nfsd4_stateids",
1026                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1027         if (stateid_slab == NULL)
1028                 goto out_nomem;
1029         deleg_slab = kmem_cache_create("nfsd4_delegations",
1030                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1031         if (deleg_slab == NULL)
1032                 goto out_nomem;
1033         return 0;
1034 out_nomem:
1035         nfsd4_free_slabs();
1036         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1037         return -ENOMEM;
1038 }
1039
1040 void
1041 nfs4_free_stateowner(struct kref *kref)
1042 {
1043         struct nfs4_stateowner *sop =
1044                 container_of(kref, struct nfs4_stateowner, so_ref);
1045         kfree(sop->so_owner.data);
1046         kmem_cache_free(stateowner_slab, sop);
1047 }
1048
1049 static inline struct nfs4_stateowner *
1050 alloc_stateowner(struct xdr_netobj *owner)
1051 {
1052         struct nfs4_stateowner *sop;
1053
1054         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1055                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1056                         memcpy(sop->so_owner.data, owner->data, owner->len);
1057                         sop->so_owner.len = owner->len;
1058                         kref_init(&sop->so_ref);
1059                         return sop;
1060                 }
1061                 kmem_cache_free(stateowner_slab, sop);
1062         }
1063         return NULL;
1064 }
1065
1066 static struct nfs4_stateowner *
1067 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1068         struct nfs4_stateowner *sop;
1069         struct nfs4_replay *rp;
1070         unsigned int idhashval;
1071
1072         if (!(sop = alloc_stateowner(&open->op_owner)))
1073                 return NULL;
1074         idhashval = ownerid_hashval(current_ownerid);
1075         INIT_LIST_HEAD(&sop->so_idhash);
1076         INIT_LIST_HEAD(&sop->so_strhash);
1077         INIT_LIST_HEAD(&sop->so_perclient);
1078         INIT_LIST_HEAD(&sop->so_stateids);
1079         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1080         INIT_LIST_HEAD(&sop->so_close_lru);
1081         sop->so_time = 0;
1082         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1083         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1084         list_add(&sop->so_perclient, &clp->cl_openowners);
1085         sop->so_is_open_owner = 1;
1086         sop->so_id = current_ownerid++;
1087         sop->so_client = clp;
1088         sop->so_seqid = open->op_seqid;
1089         sop->so_confirmed = 0;
1090         rp = &sop->so_replay;
1091         rp->rp_status = NFSERR_SERVERFAULT;
1092         rp->rp_buflen = 0;
1093         rp->rp_buf = rp->rp_ibuf;
1094         return sop;
1095 }
1096
1097 static void
1098 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1099 {
1100         struct nfs4_stateowner *lock_sop;
1101
1102         while (!list_empty(&open_stp->st_lockowners)) {
1103                 lock_sop = list_entry(open_stp->st_lockowners.next,
1104                                 struct nfs4_stateowner, so_perstateid);
1105                 /* list_del(&open_stp->st_lockowners);  */
1106                 BUG_ON(lock_sop->so_is_open_owner);
1107                 release_stateowner(lock_sop);
1108         }
1109 }
1110
1111 static void
1112 unhash_stateowner(struct nfs4_stateowner *sop)
1113 {
1114         struct nfs4_stateid *stp;
1115
1116         list_del(&sop->so_idhash);
1117         list_del(&sop->so_strhash);
1118         if (sop->so_is_open_owner)
1119                 list_del(&sop->so_perclient);
1120         list_del(&sop->so_perstateid);
1121         while (!list_empty(&sop->so_stateids)) {
1122                 stp = list_entry(sop->so_stateids.next,
1123                         struct nfs4_stateid, st_perstateowner);
1124                 if (sop->so_is_open_owner)
1125                         release_stateid(stp, OPEN_STATE);
1126                 else
1127                         release_stateid(stp, LOCK_STATE);
1128         }
1129 }
1130
1131 static void
1132 release_stateowner(struct nfs4_stateowner *sop)
1133 {
1134         unhash_stateowner(sop);
1135         list_del(&sop->so_close_lru);
1136         nfs4_put_stateowner(sop);
1137 }
1138
1139 static inline void
1140 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1141         struct nfs4_stateowner *sop = open->op_stateowner;
1142         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1143
1144         INIT_LIST_HEAD(&stp->st_hash);
1145         INIT_LIST_HEAD(&stp->st_perstateowner);
1146         INIT_LIST_HEAD(&stp->st_lockowners);
1147         INIT_LIST_HEAD(&stp->st_perfile);
1148         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1149         list_add(&stp->st_perstateowner, &sop->so_stateids);
1150         list_add(&stp->st_perfile, &fp->fi_stateids);
1151         stp->st_stateowner = sop;
1152         get_nfs4_file(fp);
1153         stp->st_file = fp;
1154         stp->st_stateid.si_boot = boot_time;
1155         stp->st_stateid.si_stateownerid = sop->so_id;
1156         stp->st_stateid.si_fileid = fp->fi_id;
1157         stp->st_stateid.si_generation = 0;
1158         stp->st_access_bmap = 0;
1159         stp->st_deny_bmap = 0;
1160         __set_bit(open->op_share_access, &stp->st_access_bmap);
1161         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1162         stp->st_openstp = NULL;
1163 }
1164
1165 static void
1166 release_stateid(struct nfs4_stateid *stp, int flags)
1167 {
1168         struct file *filp = stp->st_vfs_file;
1169
1170         list_del(&stp->st_hash);
1171         list_del(&stp->st_perfile);
1172         list_del(&stp->st_perstateowner);
1173         if (flags & OPEN_STATE) {
1174                 release_stateid_lockowners(stp);
1175                 stp->st_vfs_file = NULL;
1176                 nfsd_close(filp);
1177         } else if (flags & LOCK_STATE)
1178                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1179         put_nfs4_file(stp->st_file);
1180         kmem_cache_free(stateid_slab, stp);
1181 }
1182
1183 static void
1184 move_to_close_lru(struct nfs4_stateowner *sop)
1185 {
1186         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1187
1188         unhash_stateowner(sop);
1189         list_add_tail(&sop->so_close_lru, &close_lru);
1190         sop->so_time = get_seconds();
1191 }
1192
1193 static int
1194 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1195         return ((sop->so_owner.len == owner->len) &&
1196          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1197           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1198 }
1199
1200 static struct nfs4_stateowner *
1201 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1202 {
1203         struct nfs4_stateowner *so = NULL;
1204
1205         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1206                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1207                         return so;
1208         }
1209         return NULL;
1210 }
1211
1212 /* search file_hashtbl[] for file */
1213 static struct nfs4_file *
1214 find_file(struct inode *ino)
1215 {
1216         unsigned int hashval = file_hashval(ino);
1217         struct nfs4_file *fp;
1218
1219         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1220                 if (fp->fi_inode == ino) {
1221                         get_nfs4_file(fp);
1222                         return fp;
1223                 }
1224         }
1225         return NULL;
1226 }
1227
1228 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1229 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1230
1231 static void
1232 set_access(unsigned int *access, unsigned long bmap) {
1233         int i;
1234
1235         *access = 0;
1236         for (i = 1; i < 4; i++) {
1237                 if (test_bit(i, &bmap))
1238                         *access |= i;
1239         }
1240 }
1241
1242 static void
1243 set_deny(unsigned int *deny, unsigned long bmap) {
1244         int i;
1245
1246         *deny = 0;
1247         for (i = 0; i < 4; i++) {
1248                 if (test_bit(i, &bmap))
1249                         *deny |= i ;
1250         }
1251 }
1252
1253 static int
1254 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1255         unsigned int access, deny;
1256
1257         set_access(&access, stp->st_access_bmap);
1258         set_deny(&deny, stp->st_deny_bmap);
1259         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1260                 return 0;
1261         return 1;
1262 }
1263
1264 /*
1265  * Called to check deny when READ with all zero stateid or
1266  * WRITE with all zero or all one stateid
1267  */
1268 static int
1269 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1270 {
1271         struct inode *ino = current_fh->fh_dentry->d_inode;
1272         struct nfs4_file *fp;
1273         struct nfs4_stateid *stp;
1274         int ret;
1275
1276         dprintk("NFSD: nfs4_share_conflict\n");
1277
1278         fp = find_file(ino);
1279         if (!fp)
1280                 return nfs_ok;
1281         ret = nfserr_locked;
1282         /* Search for conflicting share reservations */
1283         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1284                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1285                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1286                         goto out;
1287         }
1288         ret = nfs_ok;
1289 out:
1290         put_nfs4_file(fp);
1291         return ret;
1292 }
1293
1294 static inline void
1295 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1296 {
1297         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1298                 put_write_access(filp->f_dentry->d_inode);
1299                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1300         }
1301 }
1302
1303 /*
1304  * Recall a delegation
1305  */
1306 static int
1307 do_recall(void *__dp)
1308 {
1309         struct nfs4_delegation *dp = __dp;
1310
1311         daemonize("nfsv4-recall");
1312
1313         nfsd4_cb_recall(dp);
1314         return 0;
1315 }
1316
1317 /*
1318  * Spawn a thread to perform a recall on the delegation represented
1319  * by the lease (file_lock)
1320  *
1321  * Called from break_lease() with lock_kernel() held.
1322  * Note: we assume break_lease will only call this *once* for any given
1323  * lease.
1324  */
1325 static
1326 void nfsd_break_deleg_cb(struct file_lock *fl)
1327 {
1328         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1329         struct task_struct *t;
1330
1331         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1332         if (!dp)
1333                 return;
1334
1335         /* We're assuming the state code never drops its reference
1336          * without first removing the lease.  Since we're in this lease
1337          * callback (and since the lease code is serialized by the kernel
1338          * lock) we know the server hasn't removed the lease yet, we know
1339          * it's safe to take a reference: */
1340         atomic_inc(&dp->dl_count);
1341
1342         spin_lock(&recall_lock);
1343         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1344         spin_unlock(&recall_lock);
1345
1346         /* only place dl_time is set. protected by lock_kernel*/
1347         dp->dl_time = get_seconds();
1348
1349         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1350         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1351
1352         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1353         if (IS_ERR(t)) {
1354                 struct nfs4_client *clp = dp->dl_client;
1355
1356                 printk(KERN_INFO "NFSD: Callback thread failed for "
1357                         "for client (clientid %08x/%08x)\n",
1358                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1359                 nfs4_put_delegation(dp);
1360         }
1361 }
1362
1363 /*
1364  * The file_lock is being reapd.
1365  *
1366  * Called by locks_free_lock() with lock_kernel() held.
1367  */
1368 static
1369 void nfsd_release_deleg_cb(struct file_lock *fl)
1370 {
1371         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1372
1373         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1374
1375         if (!(fl->fl_flags & FL_LEASE) || !dp)
1376                 return;
1377         dp->dl_flock = NULL;
1378 }
1379
1380 /*
1381  * Set the delegation file_lock back pointer.
1382  *
1383  * Called from __setlease() with lock_kernel() held.
1384  */
1385 static
1386 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1387 {
1388         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1389
1390         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1391         if (!dp)
1392                 return;
1393         dp->dl_flock = new;
1394 }
1395
1396 /*
1397  * Called from __setlease() with lock_kernel() held
1398  */
1399 static
1400 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1401 {
1402         struct nfs4_delegation *onlistd =
1403                 (struct nfs4_delegation *)onlist->fl_owner;
1404         struct nfs4_delegation *tryd =
1405                 (struct nfs4_delegation *)try->fl_owner;
1406
1407         if (onlist->fl_lmops != try->fl_lmops)
1408                 return 0;
1409
1410         return onlistd->dl_client == tryd->dl_client;
1411 }
1412
1413
1414 static
1415 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1416 {
1417         if (arg & F_UNLCK)
1418                 return lease_modify(onlist, arg);
1419         else
1420                 return -EAGAIN;
1421 }
1422
1423 static struct lock_manager_operations nfsd_lease_mng_ops = {
1424         .fl_break = nfsd_break_deleg_cb,
1425         .fl_release_private = nfsd_release_deleg_cb,
1426         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1427         .fl_mylease = nfsd_same_client_deleg_cb,
1428         .fl_change = nfsd_change_deleg_cb,
1429 };
1430
1431
1432 /*
1433  * nfsd4_process_open1()
1434  *      lookup stateowner.
1435  *              found:
1436  *                      check confirmed
1437  *                              confirmed:
1438  *                                      check seqid
1439  *                              not confirmed:
1440  *                                      delete owner
1441  *                                      create new owner
1442  *              notfound:
1443  *                      verify clientid
1444  *                      create new owner
1445  *
1446  * called with nfs4_lock_state() held.
1447  */
1448 int
1449 nfsd4_process_open1(struct nfsd4_open *open)
1450 {
1451         int status;
1452         clientid_t *clientid = &open->op_clientid;
1453         struct nfs4_client *clp = NULL;
1454         unsigned int strhashval;
1455         struct nfs4_stateowner *sop = NULL;
1456
1457         status = nfserr_inval;
1458         if (!check_name(open->op_owner))
1459                 goto out;
1460
1461         if (STALE_CLIENTID(&open->op_clientid))
1462                 return nfserr_stale_clientid;
1463
1464         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1465         sop = find_openstateowner_str(strhashval, open);
1466         if (sop) {
1467                 open->op_stateowner = sop;
1468                 /* check for replay */
1469                 if (open->op_seqid == sop->so_seqid - 1){
1470                         if (sop->so_replay.rp_buflen)
1471                                 return NFSERR_REPLAY_ME;
1472                         else {
1473                                 /* The original OPEN failed so spectacularly
1474                                  * that we don't even have replay data saved!
1475                                  * Therefore, we have no choice but to continue
1476                                  * processing this OPEN; presumably, we'll
1477                                  * fail again for the same reason.
1478                                  */
1479                                 dprintk("nfsd4_process_open1:"
1480                                         " replay with no replay cache\n");
1481                                 goto renew;
1482                         }
1483                 } else if (sop->so_confirmed) {
1484                         if (open->op_seqid == sop->so_seqid)
1485                                 goto renew;
1486                         status = nfserr_bad_seqid;
1487                         goto out;
1488                 } else {
1489                         /* If we get here, we received an OPEN for an
1490                          * unconfirmed nfs4_stateowner. Since the seqid's are
1491                          * different, purge the existing nfs4_stateowner, and
1492                          * instantiate a new one.
1493                          */
1494                         clp = sop->so_client;
1495                         release_stateowner(sop);
1496                 }
1497         } else {
1498                 /* nfs4_stateowner not found.
1499                  * Verify clientid and instantiate new nfs4_stateowner.
1500                  * If verify fails this is presumably the result of the
1501                  * client's lease expiring.
1502                  */
1503                 status = nfserr_expired;
1504                 clp = find_confirmed_client(clientid);
1505                 if (clp == NULL)
1506                         goto out;
1507         }
1508         status = nfserr_resource;
1509         sop = alloc_init_open_stateowner(strhashval, clp, open);
1510         if (sop == NULL)
1511                 goto out;
1512         open->op_stateowner = sop;
1513 renew:
1514         status = nfs_ok;
1515         renew_client(sop->so_client);
1516 out:
1517         return status;
1518 }
1519
1520 static inline int
1521 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1522 {
1523         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1524                 return nfserr_openmode;
1525         else
1526                 return nfs_ok;
1527 }
1528
1529 static struct nfs4_delegation *
1530 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1531 {
1532         struct nfs4_delegation *dp;
1533
1534         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1535                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1536                         return dp;
1537         }
1538         return NULL;
1539 }
1540
1541 static int
1542 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1543                 struct nfs4_delegation **dp)
1544 {
1545         int flags;
1546         int status = nfserr_bad_stateid;
1547
1548         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1549         if (*dp == NULL)
1550                 goto out;
1551         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1552                                                 RD_STATE : WR_STATE;
1553         status = nfs4_check_delegmode(*dp, flags);
1554         if (status)
1555                 *dp = NULL;
1556 out:
1557         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1558                 return nfs_ok;
1559         if (status)
1560                 return status;
1561         open->op_stateowner->so_confirmed = 1;
1562         return nfs_ok;
1563 }
1564
1565 static int
1566 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1567 {
1568         struct nfs4_stateid *local;
1569         int status = nfserr_share_denied;
1570         struct nfs4_stateowner *sop = open->op_stateowner;
1571
1572         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1573                 /* ignore lock owners */
1574                 if (local->st_stateowner->so_is_open_owner == 0)
1575                         continue;
1576                 /* remember if we have seen this open owner */
1577                 if (local->st_stateowner == sop)
1578                         *stpp = local;
1579                 /* check for conflicting share reservations */
1580                 if (!test_share(local, open))
1581                         goto out;
1582         }
1583         status = 0;
1584 out:
1585         return status;
1586 }
1587
1588 static inline struct nfs4_stateid *
1589 nfs4_alloc_stateid(void)
1590 {
1591         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1592 }
1593
1594 static int
1595 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1596                 struct nfs4_delegation *dp,
1597                 struct svc_fh *cur_fh, int flags)
1598 {
1599         struct nfs4_stateid *stp;
1600
1601         stp = nfs4_alloc_stateid();
1602         if (stp == NULL)
1603                 return nfserr_resource;
1604
1605         if (dp) {
1606                 get_file(dp->dl_vfs_file);
1607                 stp->st_vfs_file = dp->dl_vfs_file;
1608         } else {
1609                 int status;
1610                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1611                                 &stp->st_vfs_file);
1612                 if (status) {
1613                         if (status == nfserr_dropit)
1614                                 status = nfserr_jukebox;
1615                         kmem_cache_free(stateid_slab, stp);
1616                         return status;
1617                 }
1618         }
1619         *stpp = stp;
1620         return 0;
1621 }
1622
1623 static inline int
1624 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1625                 struct nfsd4_open *open)
1626 {
1627         struct iattr iattr = {
1628                 .ia_valid = ATTR_SIZE,
1629                 .ia_size = 0,
1630         };
1631         if (!open->op_truncate)
1632                 return 0;
1633         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1634                 return -EINVAL;
1635         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1636 }
1637
1638 static int
1639 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1640 {
1641         struct file *filp = stp->st_vfs_file;
1642         struct inode *inode = filp->f_dentry->d_inode;
1643         unsigned int share_access;
1644         int status;
1645
1646         set_access(&share_access, stp->st_access_bmap);
1647         share_access = ~share_access;
1648         share_access &= open->op_share_access;
1649
1650         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1651                 return nfsd4_truncate(rqstp, cur_fh, open);
1652
1653         status = get_write_access(inode);
1654         if (status)
1655                 return nfserrno(status);
1656         status = nfsd4_truncate(rqstp, cur_fh, open);
1657         if (status) {
1658                 put_write_access(inode);
1659                 return status;
1660         }
1661         /* remember the open */
1662         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1663         set_bit(open->op_share_access, &stp->st_access_bmap);
1664         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1665
1666         return nfs_ok;
1667 }
1668
1669
1670 static void
1671 nfs4_set_claim_prev(struct nfsd4_open *open)
1672 {
1673         open->op_stateowner->so_confirmed = 1;
1674         open->op_stateowner->so_client->cl_firststate = 1;
1675 }
1676
1677 /*
1678  * Attempt to hand out a delegation.
1679  */
1680 static void
1681 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1682 {
1683         struct nfs4_delegation *dp;
1684         struct nfs4_stateowner *sop = stp->st_stateowner;
1685         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1686         struct file_lock fl, *flp = &fl;
1687         int status, flag = 0;
1688
1689         flag = NFS4_OPEN_DELEGATE_NONE;
1690         open->op_recall = 0;
1691         switch (open->op_claim_type) {
1692                 case NFS4_OPEN_CLAIM_PREVIOUS:
1693                         if (!atomic_read(&cb->cb_set))
1694                                 open->op_recall = 1;
1695                         flag = open->op_delegate_type;
1696                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1697                                 goto out;
1698                         break;
1699                 case NFS4_OPEN_CLAIM_NULL:
1700                         /* Let's not give out any delegations till everyone's
1701                          * had the chance to reclaim theirs.... */
1702                         if (nfs4_in_grace())
1703                                 goto out;
1704                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1705                                 goto out;
1706                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1707                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1708                         else
1709                                 flag = NFS4_OPEN_DELEGATE_READ;
1710                         break;
1711                 default:
1712                         goto out;
1713         }
1714
1715         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1716         if (dp == NULL) {
1717                 flag = NFS4_OPEN_DELEGATE_NONE;
1718                 goto out;
1719         }
1720         locks_init_lock(&fl);
1721         fl.fl_lmops = &nfsd_lease_mng_ops;
1722         fl.fl_flags = FL_LEASE;
1723         fl.fl_end = OFFSET_MAX;
1724         fl.fl_owner =  (fl_owner_t)dp;
1725         fl.fl_file = stp->st_vfs_file;
1726         fl.fl_pid = current->tgid;
1727
1728         /* setlease checks to see if delegation should be handed out.
1729          * the lock_manager callbacks fl_mylease and fl_change are used
1730          */
1731         if ((status = setlease(stp->st_vfs_file,
1732                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1733                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1734                 unhash_delegation(dp);
1735                 flag = NFS4_OPEN_DELEGATE_NONE;
1736                 goto out;
1737         }
1738
1739         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1740
1741         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1742                      dp->dl_stateid.si_boot,
1743                      dp->dl_stateid.si_stateownerid,
1744                      dp->dl_stateid.si_fileid,
1745                      dp->dl_stateid.si_generation);
1746 out:
1747         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1748                         && flag == NFS4_OPEN_DELEGATE_NONE
1749                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1750                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1751         open->op_delegate_type = flag;
1752 }
1753
1754 /*
1755  * called with nfs4_lock_state() held.
1756  */
1757 int
1758 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1759 {
1760         struct nfs4_file *fp = NULL;
1761         struct inode *ino = current_fh->fh_dentry->d_inode;
1762         struct nfs4_stateid *stp = NULL;
1763         struct nfs4_delegation *dp = NULL;
1764         int status;
1765
1766         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1767                 return nfserr_grace;
1768
1769         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1770                 return nfserr_no_grace;
1771
1772         status = nfserr_inval;
1773         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1774                 goto out;
1775         /*
1776          * Lookup file; if found, lookup stateid and check open request,
1777          * and check for delegations in the process of being recalled.
1778          * If not found, create the nfs4_file struct
1779          */
1780         fp = find_file(ino);
1781         if (fp) {
1782                 if ((status = nfs4_check_open(fp, open, &stp)))
1783                         goto out;
1784                 status = nfs4_check_deleg(fp, open, &dp);
1785                 if (status)
1786                         goto out;
1787         } else {
1788                 status = nfserr_bad_stateid;
1789                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1790                         goto out;
1791                 status = nfserr_resource;
1792                 fp = alloc_init_file(ino);
1793                 if (fp == NULL)
1794                         goto out;
1795         }
1796
1797         /*
1798          * OPEN the file, or upgrade an existing OPEN.
1799          * If truncate fails, the OPEN fails.
1800          */
1801         if (stp) {
1802                 /* Stateid was found, this is an OPEN upgrade */
1803                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1804                 if (status)
1805                         goto out;
1806                 update_stateid(&stp->st_stateid);
1807         } else {
1808                 /* Stateid was not found, this is a new OPEN */
1809                 int flags = 0;
1810                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1811                         flags = MAY_WRITE;
1812                 else
1813                         flags = MAY_READ;
1814                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1815                 if (status)
1816                         goto out;
1817                 init_stateid(stp, fp, open);
1818                 status = nfsd4_truncate(rqstp, current_fh, open);
1819                 if (status) {
1820                         release_stateid(stp, OPEN_STATE);
1821                         goto out;
1822                 }
1823         }
1824         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1825
1826         /*
1827         * Attempt to hand out a delegation. No error return, because the
1828         * OPEN succeeds even if we fail.
1829         */
1830         nfs4_open_delegation(current_fh, open, stp);
1831
1832         status = nfs_ok;
1833
1834         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1835                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1836                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1837 out:
1838         if (fp)
1839                 put_nfs4_file(fp);
1840         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1841                 nfs4_set_claim_prev(open);
1842         /*
1843         * To finish the open response, we just need to set the rflags.
1844         */
1845         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1846         if (!open->op_stateowner->so_confirmed)
1847                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1848
1849         return status;
1850 }
1851
1852 static struct workqueue_struct *laundry_wq;
1853 static struct work_struct laundromat_work;
1854 static void laundromat_main(void *);
1855 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1856
1857 int
1858 nfsd4_renew(clientid_t *clid)
1859 {
1860         struct nfs4_client *clp;
1861         int status;
1862
1863         nfs4_lock_state();
1864         dprintk("process_renew(%08x/%08x): starting\n",
1865                         clid->cl_boot, clid->cl_id);
1866         status = nfserr_stale_clientid;
1867         if (STALE_CLIENTID(clid))
1868                 goto out;
1869         clp = find_confirmed_client(clid);
1870         status = nfserr_expired;
1871         if (clp == NULL) {
1872                 /* We assume the client took too long to RENEW. */
1873                 dprintk("nfsd4_renew: clientid not found!\n");
1874                 goto out;
1875         }
1876         renew_client(clp);
1877         status = nfserr_cb_path_down;
1878         if (!list_empty(&clp->cl_delegations)
1879                         && !atomic_read(&clp->cl_callback.cb_set))
1880                 goto out;
1881         status = nfs_ok;
1882 out:
1883         nfs4_unlock_state();
1884         return status;
1885 }
1886
1887 static void
1888 end_grace(void)
1889 {
1890         dprintk("NFSD: end of grace period\n");
1891         nfsd4_recdir_purge_old();
1892         in_grace = 0;
1893 }
1894
1895 static time_t
1896 nfs4_laundromat(void)
1897 {
1898         struct nfs4_client *clp;
1899         struct nfs4_stateowner *sop;
1900         struct nfs4_delegation *dp;
1901         struct list_head *pos, *next, reaplist;
1902         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1903         time_t t, clientid_val = NFSD_LEASE_TIME;
1904         time_t u, test_val = NFSD_LEASE_TIME;
1905
1906         nfs4_lock_state();
1907
1908         dprintk("NFSD: laundromat service - starting\n");
1909         if (in_grace)
1910                 end_grace();
1911         list_for_each_safe(pos, next, &client_lru) {
1912                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1913                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1914                         t = clp->cl_time - cutoff;
1915                         if (clientid_val > t)
1916                                 clientid_val = t;
1917                         break;
1918                 }
1919                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1920                         clp->cl_clientid.cl_id);
1921                 nfsd4_remove_clid_dir(clp);
1922                 expire_client(clp);
1923         }
1924         INIT_LIST_HEAD(&reaplist);
1925         spin_lock(&recall_lock);
1926         list_for_each_safe(pos, next, &del_recall_lru) {
1927                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1928                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1929                         u = dp->dl_time - cutoff;
1930                         if (test_val > u)
1931                                 test_val = u;
1932                         break;
1933                 }
1934                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1935                                     dp, dp->dl_flock);
1936                 list_move(&dp->dl_recall_lru, &reaplist);
1937         }
1938         spin_unlock(&recall_lock);
1939         list_for_each_safe(pos, next, &reaplist) {
1940                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1941                 list_del_init(&dp->dl_recall_lru);
1942                 unhash_delegation(dp);
1943         }
1944         test_val = NFSD_LEASE_TIME;
1945         list_for_each_safe(pos, next, &close_lru) {
1946                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1947                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1948                         u = sop->so_time - cutoff;
1949                         if (test_val > u)
1950                                 test_val = u;
1951                         break;
1952                 }
1953                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1954                         sop->so_id);
1955                 list_del(&sop->so_close_lru);
1956                 nfs4_put_stateowner(sop);
1957         }
1958         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1959                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1960         nfs4_unlock_state();
1961         return clientid_val;
1962 }
1963
1964 void
1965 laundromat_main(void *not_used)
1966 {
1967         time_t t;
1968
1969         t = nfs4_laundromat();
1970         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1971         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1972 }
1973
1974 static struct nfs4_stateowner *
1975 search_close_lru(u32 st_id, int flags)
1976 {
1977         struct nfs4_stateowner *local = NULL;
1978
1979         if (flags & CLOSE_STATE) {
1980                 list_for_each_entry(local, &close_lru, so_close_lru) {
1981                         if (local->so_id == st_id)
1982                                 return local;
1983                 }
1984         }
1985         return NULL;
1986 }
1987
1988 static inline int
1989 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1990 {
1991         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1992 }
1993
1994 static int
1995 STALE_STATEID(stateid_t *stateid)
1996 {
1997         if (stateid->si_boot == boot_time)
1998                 return 0;
1999         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2000                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2001                 stateid->si_generation);
2002         return 1;
2003 }
2004
2005 static inline int
2006 access_permit_read(unsigned long access_bmap)
2007 {
2008         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2009                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2010                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2011 }
2012
2013 static inline int
2014 access_permit_write(unsigned long access_bmap)
2015 {
2016         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2017                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2018 }
2019
2020 static
2021 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2022 {
2023         int status = nfserr_openmode;
2024
2025         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2026                 goto out;
2027         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2028                 goto out;
2029         status = nfs_ok;
2030 out:
2031         return status;
2032 }
2033
2034 static inline int
2035 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2036 {
2037         /* Trying to call delegreturn with a special stateid? Yuch: */
2038         if (!(flags & (RD_STATE | WR_STATE)))
2039                 return nfserr_bad_stateid;
2040         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2041                 return nfs_ok;
2042         else if (nfs4_in_grace()) {
2043                 /* Answer in remaining cases depends on existance of
2044                  * conflicting state; so we must wait out the grace period. */
2045                 return nfserr_grace;
2046         } else if (flags & WR_STATE)
2047                 return nfs4_share_conflict(current_fh,
2048                                 NFS4_SHARE_DENY_WRITE);
2049         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2050                 return nfs4_share_conflict(current_fh,
2051                                 NFS4_SHARE_DENY_READ);
2052 }
2053
2054 /*
2055  * Allow READ/WRITE during grace period on recovered state only for files
2056  * that are not able to provide mandatory locking.
2057  */
2058 static inline int
2059 io_during_grace_disallowed(struct inode *inode, int flags)
2060 {
2061         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2062                 && MANDATORY_LOCK(inode);
2063 }
2064
2065 /*
2066 * Checks for stateid operations
2067 */
2068 int
2069 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2070 {
2071         struct nfs4_stateid *stp = NULL;
2072         struct nfs4_delegation *dp = NULL;
2073         stateid_t *stidp;
2074         struct inode *ino = current_fh->fh_dentry->d_inode;
2075         int status;
2076
2077         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2078                 stateid->si_boot, stateid->si_stateownerid,
2079                 stateid->si_fileid, stateid->si_generation);
2080         if (filpp)
2081                 *filpp = NULL;
2082
2083         if (io_during_grace_disallowed(ino, flags))
2084                 return nfserr_grace;
2085
2086         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2087                 return check_special_stateids(current_fh, stateid, flags);
2088
2089         /* STALE STATEID */
2090         status = nfserr_stale_stateid;
2091         if (STALE_STATEID(stateid))
2092                 goto out;
2093
2094         /* BAD STATEID */
2095         status = nfserr_bad_stateid;
2096         if (!stateid->si_fileid) { /* delegation stateid */
2097                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2098                         dprintk("NFSD: delegation stateid not found\n");
2099                         if (nfs4_in_grace())
2100                                 status = nfserr_grace;
2101                         goto out;
2102                 }
2103                 stidp = &dp->dl_stateid;
2104         } else { /* open or lock stateid */
2105                 if (!(stp = find_stateid(stateid, flags))) {
2106                         dprintk("NFSD: open or lock stateid not found\n");
2107                         if (nfs4_in_grace())
2108                                 status = nfserr_grace;
2109                         goto out;
2110                 }
2111                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2112                         goto out;
2113                 if (!stp->st_stateowner->so_confirmed)
2114                         goto out;
2115                 stidp = &stp->st_stateid;
2116         }
2117         if (stateid->si_generation > stidp->si_generation)
2118                 goto out;
2119
2120         /* OLD STATEID */
2121         status = nfserr_old_stateid;
2122         if (stateid->si_generation < stidp->si_generation)
2123                 goto out;
2124         if (stp) {
2125                 if ((status = nfs4_check_openmode(stp,flags)))
2126                         goto out;
2127                 renew_client(stp->st_stateowner->so_client);
2128                 if (filpp)
2129                         *filpp = stp->st_vfs_file;
2130         } else if (dp) {
2131                 if ((status = nfs4_check_delegmode(dp, flags)))
2132                         goto out;
2133                 renew_client(dp->dl_client);
2134                 if (flags & DELEG_RET)
2135                         unhash_delegation(dp);
2136                 if (filpp)
2137                         *filpp = dp->dl_vfs_file;
2138         }
2139         status = nfs_ok;
2140 out:
2141         return status;
2142 }
2143
2144 static inline int
2145 setlkflg (int type)
2146 {
2147         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2148                 RD_STATE : WR_STATE;
2149 }
2150
2151 /*
2152  * Checks for sequence id mutating operations.
2153  */
2154 static int
2155 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)
2156 {
2157         struct nfs4_stateid *stp;
2158         struct nfs4_stateowner *sop;
2159
2160         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2161                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2162                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2163                 stateid->si_generation);
2164
2165         *stpp = NULL;
2166         *sopp = NULL;
2167
2168         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2169                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2170                 return nfserr_bad_stateid;
2171         }
2172
2173         if (STALE_STATEID(stateid))
2174                 return nfserr_stale_stateid;
2175         /*
2176         * We return BAD_STATEID if filehandle doesn't match stateid,
2177         * the confirmed flag is incorrecly set, or the generation
2178         * number is incorrect.
2179         */
2180         stp = find_stateid(stateid, flags);
2181         if (stp == NULL) {
2182                 /*
2183                  * Also, we should make sure this isn't just the result of
2184                  * a replayed close:
2185                  */
2186                 sop = search_close_lru(stateid->si_stateownerid, flags);
2187                 if (sop == NULL)
2188                         return nfserr_bad_stateid;
2189                 *sopp = sop;
2190                 goto check_replay;
2191         }
2192
2193         if (lock) {
2194                 struct nfs4_stateowner *sop = stp->st_stateowner;
2195                 clientid_t *lockclid = &lock->v.new.clientid;
2196                 struct nfs4_client *clp = sop->so_client;
2197                 int lkflg = 0;
2198                 int status;
2199
2200                 lkflg = setlkflg(lock->lk_type);
2201
2202                 if (lock->lk_is_new) {
2203                        if (!sop->so_is_open_owner)
2204                                return nfserr_bad_stateid;
2205                        if (!cmp_clid(&clp->cl_clientid, lockclid))
2206                                return nfserr_bad_stateid;
2207                        /* stp is the open stateid */
2208                        status = nfs4_check_openmode(stp, lkflg);
2209                        if (status)
2210                                return status;
2211                } else {
2212                        /* stp is the lock stateid */
2213                        status = nfs4_check_openmode(stp->st_openstp, lkflg);
2214                        if (status)
2215                                return status;
2216                }
2217
2218         }
2219
2220         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2221                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2222                 return nfserr_bad_stateid;
2223         }
2224
2225         *stpp = stp;
2226         *sopp = sop = stp->st_stateowner;
2227
2228         /*
2229         *  We now validate the seqid and stateid generation numbers.
2230         *  For the moment, we ignore the possibility of
2231         *  generation number wraparound.
2232         */
2233         if (seqid != sop->so_seqid)
2234                 goto check_replay;
2235
2236         if (sop->so_confirmed && flags & CONFIRM) {
2237                 printk("NFSD: preprocess_seqid_op: expected"
2238                                 " unconfirmed stateowner!\n");
2239                 return nfserr_bad_stateid;
2240         }
2241         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2242                 printk("NFSD: preprocess_seqid_op: stateowner not"
2243                                 " confirmed yet!\n");
2244                 return nfserr_bad_stateid;
2245         }
2246         if (stateid->si_generation > stp->st_stateid.si_generation) {
2247                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2248                 return nfserr_bad_stateid;
2249         }
2250
2251         if (stateid->si_generation < stp->st_stateid.si_generation) {
2252                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2253                 return nfserr_old_stateid;
2254         }
2255         renew_client(sop->so_client);
2256         return nfs_ok;
2257
2258 check_replay:
2259         if (seqid == sop->so_seqid - 1) {
2260                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2261                 /* indicate replay to calling function */
2262                 return NFSERR_REPLAY_ME;
2263         }
2264         printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2265                         sop->so_seqid, seqid);
2266         *sopp = NULL;
2267         return nfserr_bad_seqid;
2268 }
2269
2270 int
2271 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner)
2272 {
2273         int status;
2274         struct nfs4_stateowner *sop;
2275         struct nfs4_stateid *stp;
2276
2277         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2278                         (int)current_fh->fh_dentry->d_name.len,
2279                         current_fh->fh_dentry->d_name.name);
2280
2281         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2282                 goto out;
2283
2284         nfs4_lock_state();
2285
2286         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2287                                         &oc->oc_req_stateid,
2288                                         CHECK_FH | CONFIRM | OPEN_STATE,
2289                                         &oc->oc_stateowner, &stp, NULL)))
2290                 goto out;
2291
2292         sop = oc->oc_stateowner;
2293         sop->so_confirmed = 1;
2294         update_stateid(&stp->st_stateid);
2295         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2296         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2297                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2298                          stp->st_stateid.si_boot,
2299                          stp->st_stateid.si_stateownerid,
2300                          stp->st_stateid.si_fileid,
2301                          stp->st_stateid.si_generation);
2302
2303         nfsd4_create_clid_dir(sop->so_client);
2304 out:
2305         if (oc->oc_stateowner) {
2306                 nfs4_get_stateowner(oc->oc_stateowner);
2307                 *replay_owner = oc->oc_stateowner;
2308         }
2309         nfs4_unlock_state();
2310         return status;
2311 }
2312
2313
2314 /*
2315  * unset all bits in union bitmap (bmap) that
2316  * do not exist in share (from successful OPEN_DOWNGRADE)
2317  */
2318 static void
2319 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2320 {
2321         int i;
2322         for (i = 1; i < 4; i++) {
2323                 if ((i & access) != i)
2324                         __clear_bit(i, bmap);
2325         }
2326 }
2327
2328 static void
2329 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2330 {
2331         int i;
2332         for (i = 0; i < 4; i++) {
2333                 if ((i & deny) != i)
2334                         __clear_bit(i, bmap);
2335         }
2336 }
2337
2338 int
2339 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner)
2340 {
2341         int status;
2342         struct nfs4_stateid *stp;
2343         unsigned int share_access;
2344
2345         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2346                         (int)current_fh->fh_dentry->d_name.len,
2347                         current_fh->fh_dentry->d_name.name);
2348
2349         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2350                 return nfserr_inval;
2351
2352         nfs4_lock_state();
2353         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2354                                         &od->od_stateid,
2355                                         CHECK_FH | OPEN_STATE,
2356                                         &od->od_stateowner, &stp, NULL)))
2357                 goto out;
2358
2359         status = nfserr_inval;
2360         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2361                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2362                         stp->st_access_bmap, od->od_share_access);
2363                 goto out;
2364         }
2365         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2366                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2367                         stp->st_deny_bmap, od->od_share_deny);
2368                 goto out;
2369         }
2370         set_access(&share_access, stp->st_access_bmap);
2371         nfs4_file_downgrade(stp->st_vfs_file,
2372                             share_access & ~od->od_share_access);
2373
2374         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2375         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2376
2377         update_stateid(&stp->st_stateid);
2378         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2379         status = nfs_ok;
2380 out:
2381         if (od->od_stateowner) {
2382                 nfs4_get_stateowner(od->od_stateowner);
2383                 *replay_owner = od->od_stateowner;
2384         }
2385         nfs4_unlock_state();
2386         return status;
2387 }
2388
2389 /*
2390  * nfs4_unlock_state() called after encode
2391  */
2392 int
2393 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner)
2394 {
2395         int status;
2396         struct nfs4_stateid *stp;
2397
2398         dprintk("NFSD: nfsd4_close on file %.*s\n",
2399                         (int)current_fh->fh_dentry->d_name.len,
2400                         current_fh->fh_dentry->d_name.name);
2401
2402         nfs4_lock_state();
2403         /* check close_lru for replay */
2404         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2405                                         &close->cl_stateid,
2406                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2407                                         &close->cl_stateowner, &stp, NULL)))
2408                 goto out;
2409         status = nfs_ok;
2410         update_stateid(&stp->st_stateid);
2411         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2412
2413         /* release_stateid() calls nfsd_close() if needed */
2414         release_stateid(stp, OPEN_STATE);
2415
2416         /* place unused nfs4_stateowners on so_close_lru list to be
2417          * released by the laundromat service after the lease period
2418          * to enable us to handle CLOSE replay
2419          */
2420         if (list_empty(&close->cl_stateowner->so_stateids))
2421                 move_to_close_lru(close->cl_stateowner);
2422 out:
2423         if (close->cl_stateowner) {
2424                 nfs4_get_stateowner(close->cl_stateowner);
2425                 *replay_owner = close->cl_stateowner;
2426         }
2427         nfs4_unlock_state();
2428         return status;
2429 }
2430
2431 int
2432 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2433 {
2434         int status;
2435
2436         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2437                 goto out;
2438
2439         nfs4_lock_state();
2440         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2441         nfs4_unlock_state();
2442 out:
2443         return status;
2444 }
2445
2446
2447 /*
2448  * Lock owner state (byte-range locks)
2449  */
2450 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2451 #define LOCK_HASH_BITS              8
2452 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2453 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2454
2455 #define lockownerid_hashval(id) \
2456         ((id) & LOCK_HASH_MASK)
2457
2458 static inline unsigned int
2459 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2460                 struct xdr_netobj *ownername)
2461 {
2462         return (file_hashval(inode) + cl_id
2463                         + opaque_hashval(ownername->data, ownername->len))
2464                 & LOCK_HASH_MASK;
2465 }
2466
2467 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2468 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2469 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2470
2471 static struct nfs4_stateid *
2472 find_stateid(stateid_t *stid, int flags)
2473 {
2474         struct nfs4_stateid *local = NULL;
2475         u32 st_id = stid->si_stateownerid;
2476         u32 f_id = stid->si_fileid;
2477         unsigned int hashval;
2478
2479         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2480         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2481                 hashval = stateid_hashval(st_id, f_id);
2482                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2483                         if ((local->st_stateid.si_stateownerid == st_id) &&
2484                             (local->st_stateid.si_fileid == f_id))
2485                                 return local;
2486                 }
2487         }
2488         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2489                 hashval = stateid_hashval(st_id, f_id);
2490                 list_for_each_entry(local, &stateid_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         return NULL;
2497 }
2498
2499 static struct nfs4_delegation *
2500 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2501 {
2502         struct nfs4_file *fp;
2503         struct nfs4_delegation *dl;
2504
2505         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2506                     stid->si_boot, stid->si_stateownerid,
2507                     stid->si_fileid, stid->si_generation);
2508
2509         fp = find_file(ino);
2510         if (!fp)
2511                 return NULL;
2512         dl = find_delegation_file(fp, stid);
2513         put_nfs4_file(fp);
2514         return dl;
2515 }
2516
2517 /*
2518  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2519  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2520  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2521  * locking, this prevents us from being completely protocol-compliant.  The
2522  * real solution to this problem is to start using unsigned file offsets in
2523  * the VFS, but this is a very deep change!
2524  */
2525 static inline void
2526 nfs4_transform_lock_offset(struct file_lock *lock)
2527 {
2528         if (lock->fl_start < 0)
2529                 lock->fl_start = OFFSET_MAX;
2530         if (lock->fl_end < 0)
2531                 lock->fl_end = OFFSET_MAX;
2532 }
2533
2534 static int
2535 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2536 {
2537         struct nfs4_stateowner *local = NULL;
2538         int status = 0;
2539
2540         if (hashval >= LOCK_HASH_SIZE)
2541                 goto out;
2542         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2543                 if (local == sop) {
2544                         status = 1;
2545                         goto out;
2546                 }
2547         }
2548 out:
2549         return status;
2550 }
2551
2552
2553 static inline void
2554 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2555 {
2556         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2557         unsigned int hval = lockownerid_hashval(sop->so_id);
2558
2559         deny->ld_sop = NULL;
2560         if (nfs4_verify_lock_stateowner(sop, hval)) {
2561                 kref_get(&sop->so_ref);
2562                 deny->ld_sop = sop;
2563                 deny->ld_clientid = sop->so_client->cl_clientid;
2564         }
2565         deny->ld_start = fl->fl_start;
2566         deny->ld_length = ~(u64)0;
2567         if (fl->fl_end != ~(u64)0)
2568                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2569         deny->ld_type = NFS4_READ_LT;
2570         if (fl->fl_type != F_RDLCK)
2571                 deny->ld_type = NFS4_WRITE_LT;
2572 }
2573
2574 static struct nfs4_stateowner *
2575 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2576                 struct xdr_netobj *owner)
2577 {
2578         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2579         struct nfs4_stateowner *op;
2580
2581         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2582                 if (cmp_owner_str(op, owner, clid))
2583                         return op;
2584         }
2585         return NULL;
2586 }
2587
2588 /*
2589  * Alloc a lock owner structure.
2590  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2591  * occured.
2592  *
2593  * strhashval = lock_ownerstr_hashval
2594  */
2595
2596 static struct nfs4_stateowner *
2597 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2598         struct nfs4_stateowner *sop;
2599         struct nfs4_replay *rp;
2600         unsigned int idhashval;
2601
2602         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2603                 return NULL;
2604         idhashval = lockownerid_hashval(current_ownerid);
2605         INIT_LIST_HEAD(&sop->so_idhash);
2606         INIT_LIST_HEAD(&sop->so_strhash);
2607         INIT_LIST_HEAD(&sop->so_perclient);
2608         INIT_LIST_HEAD(&sop->so_stateids);
2609         INIT_LIST_HEAD(&sop->so_perstateid);
2610         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2611         sop->so_time = 0;
2612         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2613         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2614         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2615         sop->so_is_open_owner = 0;
2616         sop->so_id = current_ownerid++;
2617         sop->so_client = clp;
2618         /* It is the openowner seqid that will be incremented in encode in the
2619          * case of new lockowners; so increment the lock seqid manually: */
2620         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2621         sop->so_confirmed = 1;
2622         rp = &sop->so_replay;
2623         rp->rp_status = NFSERR_SERVERFAULT;
2624         rp->rp_buflen = 0;
2625         rp->rp_buf = rp->rp_ibuf;
2626         return sop;
2627 }
2628
2629 static struct nfs4_stateid *
2630 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2631 {
2632         struct nfs4_stateid *stp;
2633         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2634
2635         stp = nfs4_alloc_stateid();
2636         if (stp == NULL)
2637                 goto out;
2638         INIT_LIST_HEAD(&stp->st_hash);
2639         INIT_LIST_HEAD(&stp->st_perfile);
2640         INIT_LIST_HEAD(&stp->st_perstateowner);
2641         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2642         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2643         list_add(&stp->st_perfile, &fp->fi_stateids);
2644         list_add(&stp->st_perstateowner, &sop->so_stateids);
2645         stp->st_stateowner = sop;
2646         get_nfs4_file(fp);
2647         stp->st_file = fp;
2648         stp->st_stateid.si_boot = boot_time;
2649         stp->st_stateid.si_stateownerid = sop->so_id;
2650         stp->st_stateid.si_fileid = fp->fi_id;
2651         stp->st_stateid.si_generation = 0;
2652         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2653         stp->st_access_bmap = open_stp->st_access_bmap;
2654         stp->st_deny_bmap = open_stp->st_deny_bmap;
2655         stp->st_openstp = open_stp;
2656
2657 out:
2658         return stp;
2659 }
2660
2661 static int
2662 check_lock_length(u64 offset, u64 length)
2663 {
2664         return ((length == 0)  || ((length != ~(u64)0) &&
2665              LOFF_OVERFLOW(offset, length)));
2666 }
2667
2668 /*
2669  *  LOCK operation
2670  */
2671 int
2672 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner)
2673 {
2674         struct nfs4_stateowner *open_sop = NULL;
2675         struct nfs4_stateowner *lock_sop = NULL;
2676         struct nfs4_stateid *lock_stp;
2677         struct file *filp;
2678         struct file_lock file_lock;
2679         struct file_lock *conflock;
2680         int status = 0;
2681         unsigned int strhashval;
2682
2683         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2684                 (long long) lock->lk_offset,
2685                 (long long) lock->lk_length);
2686
2687         if (check_lock_length(lock->lk_offset, lock->lk_length))
2688                  return nfserr_inval;
2689
2690         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2691                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2692                 return status;
2693         }
2694
2695         nfs4_lock_state();
2696
2697         if (lock->lk_is_new) {
2698                 /*
2699                  * Client indicates that this is a new lockowner.
2700                  * Use open owner and open stateid to create lock owner and
2701                  * lock stateid.
2702                  */
2703                 struct nfs4_stateid *open_stp = NULL;
2704                 struct nfs4_file *fp;
2705
2706                 status = nfserr_stale_clientid;
2707                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2708                         goto out;
2709
2710                 /* validate and update open stateid and open seqid */
2711                 status = nfs4_preprocess_seqid_op(current_fh,
2712                                         lock->lk_new_open_seqid,
2713                                         &lock->lk_new_open_stateid,
2714                                         CHECK_FH | OPEN_STATE,
2715                                         &lock->lk_replay_owner, &open_stp,
2716                                         lock);
2717                 if (status)
2718                         goto out;
2719                 open_sop = lock->lk_replay_owner;
2720                 /* create lockowner and lock stateid */
2721                 fp = open_stp->st_file;
2722                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2723                                 open_sop->so_client->cl_clientid.cl_id,
2724                                 &lock->v.new.owner);
2725                 /* XXX: Do we need to check for duplicate stateowners on
2726                  * the same file, or should they just be allowed (and
2727                  * create new stateids)? */
2728                 status = nfserr_resource;
2729                 lock_sop = alloc_init_lock_stateowner(strhashval,
2730                                 open_sop->so_client, open_stp, lock);
2731                 if (lock_sop == NULL)
2732                         goto out;
2733                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2734                 if (lock_stp == NULL)
2735                         goto out;
2736         } else {
2737                 /* lock (lock owner + lock stateid) already exists */
2738                 status = nfs4_preprocess_seqid_op(current_fh,
2739                                        lock->lk_old_lock_seqid,
2740                                        &lock->lk_old_lock_stateid,
2741                                        CHECK_FH | LOCK_STATE,
2742                                        &lock->lk_replay_owner, &lock_stp, lock);
2743                 if (status)
2744                         goto out;
2745                 lock_sop = lock->lk_replay_owner;
2746         }
2747         /* lock->lk_replay_owner and lock_stp have been created or found */
2748         filp = lock_stp->st_vfs_file;
2749
2750         status = nfserr_grace;
2751         if (nfs4_in_grace() && !lock->lk_reclaim)
2752                 goto out;
2753         status = nfserr_no_grace;
2754         if (!nfs4_in_grace() && lock->lk_reclaim)
2755                 goto out;
2756
2757         locks_init_lock(&file_lock);
2758         switch (lock->lk_type) {
2759                 case NFS4_READ_LT:
2760                 case NFS4_READW_LT:
2761                         file_lock.fl_type = F_RDLCK;
2762                 break;
2763                 case NFS4_WRITE_LT:
2764                 case NFS4_WRITEW_LT:
2765                         file_lock.fl_type = F_WRLCK;
2766                 break;
2767                 default:
2768                         status = nfserr_inval;
2769                 goto out;
2770         }
2771         file_lock.fl_owner = (fl_owner_t)lock_sop;
2772         file_lock.fl_pid = current->tgid;
2773         file_lock.fl_file = filp;
2774         file_lock.fl_flags = FL_POSIX;
2775
2776         file_lock.fl_start = lock->lk_offset;
2777         if ((lock->lk_length == ~(u64)0) ||
2778                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2779                 file_lock.fl_end = ~(u64)0;
2780         else
2781                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2782         nfs4_transform_lock_offset(&file_lock);
2783
2784         /*
2785         * Try to lock the file in the VFS.
2786         * Note: locks.c uses the BKL to protect the inode's lock list.
2787         */
2788
2789         status = posix_lock_file(filp, &file_lock);
2790         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2791         switch (-status) {
2792         case 0: /* success! */
2793                 update_stateid(&lock_stp->st_stateid);
2794                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2795                                 sizeof(stateid_t));
2796                 goto out;
2797         case (EAGAIN):
2798                 goto conflicting_lock;
2799         case (EDEADLK):
2800                 status = nfserr_deadlock;
2801         default:
2802                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2803                 goto out;
2804         }
2805
2806 conflicting_lock:
2807         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2808         status = nfserr_denied;
2809         /* XXX There is a race here. Future patch needed to provide
2810          * an atomic posix_lock_and_test_file
2811          */
2812         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2813                 status = nfserr_serverfault;
2814                 goto out;
2815         }
2816         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2817 out:
2818         if (status && lock->lk_is_new && lock_sop)
2819                 release_stateowner(lock_sop);
2820         if (lock->lk_replay_owner) {
2821                 nfs4_get_stateowner(lock->lk_replay_owner);
2822                 *replay_owner = lock->lk_replay_owner;
2823         }
2824         nfs4_unlock_state();
2825         return status;
2826 }
2827
2828 /*
2829  * LOCKT operation
2830  */
2831 int
2832 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2833 {
2834         struct inode *inode;
2835         struct file file;
2836         struct file_lock file_lock;
2837         struct file_lock *conflicting_lock;
2838         int status;
2839
2840         if (nfs4_in_grace())
2841                 return nfserr_grace;
2842
2843         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2844                  return nfserr_inval;
2845
2846         lockt->lt_stateowner = NULL;
2847         nfs4_lock_state();
2848
2849         status = nfserr_stale_clientid;
2850         if (STALE_CLIENTID(&lockt->lt_clientid))
2851                 goto out;
2852
2853         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2854                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2855                 if (status == nfserr_symlink)
2856                         status = nfserr_inval;
2857                 goto out;
2858         }
2859
2860         inode = current_fh->fh_dentry->d_inode;
2861         locks_init_lock(&file_lock);
2862         switch (lockt->lt_type) {
2863                 case NFS4_READ_LT:
2864                 case NFS4_READW_LT:
2865                         file_lock.fl_type = F_RDLCK;
2866                 break;
2867                 case NFS4_WRITE_LT:
2868                 case NFS4_WRITEW_LT:
2869                         file_lock.fl_type = F_WRLCK;
2870                 break;
2871                 default:
2872                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2873                         status = nfserr_inval;
2874                 goto out;
2875         }
2876
2877         lockt->lt_stateowner = find_lockstateowner_str(inode,
2878                         &lockt->lt_clientid, &lockt->lt_owner);
2879         if (lockt->lt_stateowner)
2880                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2881         file_lock.fl_pid = current->tgid;
2882         file_lock.fl_flags = FL_POSIX;
2883
2884         file_lock.fl_start = lockt->lt_offset;
2885         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2886                 file_lock.fl_end = ~(u64)0;
2887         else
2888                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2889
2890         nfs4_transform_lock_offset(&file_lock);
2891
2892         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2893          * since LOCKT doesn't require an OPEN, and therefore a struct
2894          * file may not exist, pass posix_test_lock a struct file with
2895          * only the dentry:inode set.
2896          */
2897         memset(&file, 0, sizeof (struct file));
2898         file.f_dentry = current_fh->fh_dentry;
2899
2900         status = nfs_ok;
2901         conflicting_lock = posix_test_lock(&file, &file_lock);
2902         if (conflicting_lock) {
2903                 status = nfserr_denied;
2904                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2905         }
2906 out:
2907         nfs4_unlock_state();
2908         return status;
2909 }
2910
2911 int
2912 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner)
2913 {
2914         struct nfs4_stateid *stp;
2915         struct file *filp = NULL;
2916         struct file_lock file_lock;
2917         int status;
2918
2919         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2920                 (long long) locku->lu_offset,
2921                 (long long) locku->lu_length);
2922
2923         if (check_lock_length(locku->lu_offset, locku->lu_length))
2924                  return nfserr_inval;
2925
2926         nfs4_lock_state();
2927
2928         if ((status = nfs4_preprocess_seqid_op(current_fh,
2929                                         locku->lu_seqid,
2930                                         &locku->lu_stateid,
2931                                         CHECK_FH | LOCK_STATE,
2932                                         &locku->lu_stateowner, &stp, NULL)))
2933                 goto out;
2934
2935         filp = stp->st_vfs_file;
2936         BUG_ON(!filp);
2937         locks_init_lock(&file_lock);
2938         file_lock.fl_type = F_UNLCK;
2939         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2940         file_lock.fl_pid = current->tgid;
2941         file_lock.fl_file = filp;
2942         file_lock.fl_flags = FL_POSIX;
2943         file_lock.fl_start = locku->lu_offset;
2944
2945         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2946                 file_lock.fl_end = ~(u64)0;
2947         else
2948                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2949         nfs4_transform_lock_offset(&file_lock);
2950
2951         /*
2952         *  Try to unlock the file in the VFS.
2953         */
2954         status = posix_lock_file(filp, &file_lock);
2955         if (status) {
2956                 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2957                 goto out_nfserr;
2958         }
2959         /*
2960         * OK, unlock succeeded; the only thing left to do is update the stateid.
2961         */
2962         update_stateid(&stp->st_stateid);
2963         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2964
2965 out:
2966         if (locku->lu_stateowner) {
2967                 nfs4_get_stateowner(locku->lu_stateowner);
2968                 *replay_owner = locku->lu_stateowner;
2969         }
2970         nfs4_unlock_state();
2971         return status;
2972
2973 out_nfserr:
2974         status = nfserrno(status);
2975         goto out;
2976 }
2977
2978 /*
2979  * returns
2980  *      1: locks held by lockowner
2981  *      0: no locks held by lockowner
2982  */
2983 static int
2984 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2985 {
2986         struct file_lock **flpp;
2987         struct inode *inode = filp->f_dentry->d_inode;
2988         int status = 0;
2989
2990         lock_kernel();
2991         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2992                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2993                         status = 1;
2994                         goto out;
2995                 }
2996         }
2997 out:
2998         unlock_kernel();
2999         return status;
3000 }
3001
3002 int
3003 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3004 {
3005         clientid_t *clid = &rlockowner->rl_clientid;
3006         struct nfs4_stateowner *sop;
3007         struct nfs4_stateid *stp;
3008         struct xdr_netobj *owner = &rlockowner->rl_owner;
3009         struct list_head matches;
3010         int i;
3011         int status;
3012
3013         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3014                 clid->cl_boot, clid->cl_id);
3015
3016         /* XXX check for lease expiration */
3017
3018         status = nfserr_stale_clientid;
3019         if (STALE_CLIENTID(clid))
3020                 return status;
3021
3022         nfs4_lock_state();
3023
3024         status = nfserr_locks_held;
3025         /* XXX: we're doing a linear search through all the lockowners.
3026          * Yipes!  For now we'll just hope clients aren't really using
3027          * release_lockowner much, but eventually we have to fix these
3028          * data structures. */
3029         INIT_LIST_HEAD(&matches);
3030         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3031                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3032                         if (!cmp_owner_str(sop, owner, clid))
3033                                 continue;
3034                         list_for_each_entry(stp, &sop->so_stateids,
3035                                         st_perstateowner) {
3036                                 if (check_for_locks(stp->st_vfs_file, sop))
3037                                         goto out;
3038                                 /* Note: so_perclient unused for lockowners,
3039                                  * so it's OK to fool with here. */
3040                                 list_add(&sop->so_perclient, &matches);
3041                         }
3042                 }
3043         }
3044         /* Clients probably won't expect us to return with some (but not all)
3045          * of the lockowner state released; so don't release any until all
3046          * have been checked. */
3047         status = nfs_ok;
3048         while (!list_empty(&matches)) {
3049                 sop = list_entry(matches.next, struct nfs4_stateowner,
3050                                                                 so_perclient);
3051                 /* unhash_stateowner deletes so_perclient only
3052                  * for openowners. */
3053                 list_del(&sop->so_perclient);
3054                 release_stateowner(sop);
3055         }
3056 out:
3057         nfs4_unlock_state();
3058         return status;
3059 }
3060
3061 static inline struct nfs4_client_reclaim *
3062 alloc_reclaim(void)
3063 {
3064         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3065 }
3066
3067 int
3068 nfs4_has_reclaimed_state(const char *name)
3069 {
3070         unsigned int strhashval = clientstr_hashval(name);
3071         struct nfs4_client *clp;
3072
3073         clp = find_confirmed_client_by_str(name, strhashval);
3074         return clp ? 1 : 0;
3075 }
3076
3077 /*
3078  * failure => all reset bets are off, nfserr_no_grace...
3079  */
3080 int
3081 nfs4_client_to_reclaim(const char *name)
3082 {
3083         unsigned int strhashval;
3084         struct nfs4_client_reclaim *crp = NULL;
3085
3086         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3087         crp = alloc_reclaim();
3088         if (!crp)
3089                 return 0;
3090         strhashval = clientstr_hashval(name);
3091         INIT_LIST_HEAD(&crp->cr_strhash);
3092         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3093         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3094         reclaim_str_hashtbl_size++;
3095         return 1;
3096 }
3097
3098 static void
3099 nfs4_release_reclaim(void)
3100 {
3101         struct nfs4_client_reclaim *crp = NULL;
3102         int i;
3103
3104         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3105                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3106                         crp = list_entry(reclaim_str_hashtbl[i].next,
3107                                         struct nfs4_client_reclaim, cr_strhash);
3108                         list_del(&crp->cr_strhash);
3109                         kfree(crp);
3110                         reclaim_str_hashtbl_size--;
3111                 }
3112         }
3113         BUG_ON(reclaim_str_hashtbl_size);
3114 }
3115
3116 /*
3117  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3118 static struct nfs4_client_reclaim *
3119 nfs4_find_reclaim_client(clientid_t *clid)
3120 {
3121         unsigned int strhashval;
3122         struct nfs4_client *clp;
3123         struct nfs4_client_reclaim *crp = NULL;
3124
3125
3126         /* find clientid in conf_id_hashtbl */
3127         clp = find_confirmed_client(clid);
3128         if (clp == NULL)
3129                 return NULL;
3130
3131         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3132                             clp->cl_name.len, clp->cl_name.data,
3133                             clp->cl_recdir);
3134
3135         /* find clp->cl_name in reclaim_str_hashtbl */
3136         strhashval = clientstr_hashval(clp->cl_recdir);
3137         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3138                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3139                         return crp;
3140                 }
3141         }
3142         return NULL;
3143 }
3144
3145 /*
3146 * Called from OPEN. Look for clientid in reclaim list.
3147 */
3148 int
3149 nfs4_check_open_reclaim(clientid_t *clid)
3150 {
3151         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3152 }
3153
3154 /* initialization to perform at module load time: */
3155
3156 void
3157 nfs4_state_init(void)
3158 {
3159         int i;
3160
3161         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3162                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3163                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3164                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3165                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3166         }
3167         for (i = 0; i < FILE_HASH_SIZE; i++) {
3168                 INIT_LIST_HEAD(&file_hashtbl[i]);
3169         }
3170         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3171                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3172                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3173         }
3174         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3175                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3176                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3177         }
3178         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3179                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3180                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3181         }
3182         memset(&onestateid, ~0, sizeof(stateid_t));
3183         INIT_LIST_HEAD(&close_lru);
3184         INIT_LIST_HEAD(&client_lru);
3185         INIT_LIST_HEAD(&del_recall_lru);
3186         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3187                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3188         reclaim_str_hashtbl_size = 0;
3189 }
3190
3191 static void
3192 nfsd4_load_reboot_recovery_data(void)
3193 {
3194         int status;
3195
3196         nfs4_lock_state();
3197         nfsd4_init_recdir(user_recovery_dirname);
3198         status = nfsd4_recdir_load();
3199         nfs4_unlock_state();
3200         if (status)
3201                 printk("NFSD: Failure reading reboot recovery data\n");
3202 }
3203
3204 /* initialization to perform when the nfsd service is started: */
3205
3206 static void
3207 __nfs4_state_start(void)
3208 {
3209         time_t grace_time;
3210
3211         boot_time = get_seconds();
3212         grace_time = max(user_lease_time, lease_time);
3213         lease_time = user_lease_time;
3214         in_grace = 1;
3215         printk("NFSD: starting %ld-second grace period\n", grace_time);
3216         laundry_wq = create_singlethread_workqueue("nfsd4");
3217         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3218 }
3219
3220 int
3221 nfs4_state_start(void)
3222 {
3223         int status;
3224
3225         if (nfs4_init)
3226                 return 0;
3227         status = nfsd4_init_slabs();
3228         if (status)
3229                 return status;
3230         nfsd4_load_reboot_recovery_data();
3231         __nfs4_state_start();
3232         nfs4_init = 1;
3233         return 0;
3234 }
3235
3236 int
3237 nfs4_in_grace(void)
3238 {
3239         return in_grace;
3240 }
3241
3242 time_t
3243 nfs4_lease_time(void)
3244 {
3245         return lease_time;
3246 }
3247
3248 static void
3249 __nfs4_state_shutdown(void)
3250 {
3251         int i;
3252         struct nfs4_client *clp = NULL;
3253         struct nfs4_delegation *dp = NULL;
3254         struct nfs4_stateowner *sop = NULL;
3255         struct list_head *pos, *next, reaplist;
3256
3257         list_for_each_safe(pos, next, &close_lru) {
3258                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3259                 list_del(&sop->so_close_lru);
3260                 nfs4_put_stateowner(sop);
3261         }
3262
3263         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3264                 while (!list_empty(&conf_id_hashtbl[i])) {
3265                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3266                         expire_client(clp);
3267                 }
3268                 while (!list_empty(&unconf_str_hashtbl[i])) {
3269                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3270                         expire_client(clp);
3271                 }
3272         }
3273         INIT_LIST_HEAD(&reaplist);
3274         spin_lock(&recall_lock);
3275         list_for_each_safe(pos, next, &del_recall_lru) {
3276                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3277                 list_move(&dp->dl_recall_lru, &reaplist);
3278         }
3279         spin_unlock(&recall_lock);
3280         list_for_each_safe(pos, next, &reaplist) {
3281                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3282                 list_del_init(&dp->dl_recall_lru);
3283                 unhash_delegation(dp);
3284         }
3285
3286         cancel_delayed_work(&laundromat_work);
3287         flush_workqueue(laundry_wq);
3288         destroy_workqueue(laundry_wq);
3289         nfsd4_shutdown_recdir();
3290         nfs4_init = 0;
3291 }
3292
3293 void
3294 nfs4_state_shutdown(void)
3295 {
3296         nfs4_lock_state();
3297         nfs4_release_reclaim();
3298         __nfs4_state_shutdown();
3299         nfsd4_free_slabs();
3300         nfs4_unlock_state();
3301 }
3302
3303 static void
3304 nfs4_set_recdir(char *recdir)
3305 {
3306         nfs4_lock_state();
3307         strcpy(user_recovery_dirname, recdir);
3308         nfs4_unlock_state();
3309 }
3310
3311 /*
3312  * Change the NFSv4 recovery directory to recdir.
3313  */
3314 int
3315 nfs4_reset_recoverydir(char *recdir)
3316 {
3317         int status;
3318         struct nameidata nd;
3319
3320         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3321         if (status)
3322                 return status;
3323         status = -ENOTDIR;
3324         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3325                 nfs4_set_recdir(recdir);
3326                 status = 0;
3327         }
3328         path_release(&nd);
3329         return status;
3330 }
3331
3332 /*
3333  * Called when leasetime is changed.
3334  *
3335  * The only way the protocol gives us to handle on-the-fly lease changes is to
3336  * simulate a reboot.  Instead of doing that, we just wait till the next time
3337  * we start to register any changes in lease time.  If the administrator
3338  * really wants to change the lease time *now*, they can go ahead and bring
3339  * nfsd down and then back up again after changing the lease time.
3340  */
3341 void
3342 nfs4_reset_lease(time_t leasetime)
3343 {
3344         lock_kernel();
3345         user_lease_time = leasetime;
3346         unlock_kernel();
3347 }