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
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 /* Globals */
  55 static time_t lease_time = 90;     /* default lease time */
  56 static time_t user_lease_time = 90;
  57 static time_t boot_time;
  58 static int in_grace = 1;
  59 static u32 current_clientid = 1;
  60 static u32 current_ownerid = 1;
  61 static u32 current_fileid = 1;
  62 static u32 current_delegid = 1;
  63 static u32 nfs4_init;
  64 static stateid_t zerostateid;             /* bits all 0 */
  65 static stateid_t onestateid;              /* bits all 1 */
  66
  67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
  68 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
  69
  70 /* forward declarations */
  71 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  72 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  73 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  74
  75 /* Locking:
  76  *
  77  * client_sema:
  78  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  79  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  80  */
  81 static DECLARE_MUTEX(client_sema);
  82
  83 static kmem_cache_t *stateowner_slab = NULL;
  84 static kmem_cache_t *file_slab = NULL;
  85 static kmem_cache_t *stateid_slab = NULL;
  86 static kmem_cache_t *deleg_slab = NULL;
  87
  88 void
  89 nfs4_lock_state(void)
  90 {
  91         down(&client_sema);
  92 }
  93
  94 void
  95 nfs4_unlock_state(void)
  96 {
  97         up(&client_sema);
  98 }
  99
 100 static inline u32
 101 opaque_hashval(const void *ptr, int nbytes)
 102 {
 103         unsigned char *cptr = (unsigned char *) ptr;
 104
 105         u32 x = 0;
 106         while (nbytes--) {
 107                 x *= 37;
 108                 x += *cptr++;
 109         }
 110         return x;
 111 }
 112
 113 /* forward declarations */
 114 static void release_stateowner(struct nfs4_stateowner *sop);
 115 static void release_stateid(struct nfs4_stateid *stp, int flags);
 116
 117 /*
 118  * Delegation state
 119  */
 120
 121 /* recall_lock protects the del_recall_lru */
 122 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
 123 static struct list_head del_recall_lru;
 124
 125 static void
 126 free_nfs4_file(struct kref *kref)
 127 {
 128         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 129         list_del(&fp->fi_hash);
 130         iput(fp->fi_inode);
 131         kmem_cache_free(file_slab, fp);
 132 }
 133
 134 static inline void
 135 put_nfs4_file(struct nfs4_file *fi)
 136 {
 137         kref_put(&fi->fi_ref, free_nfs4_file);
 138 }
 139
 140 static inline void
 141 get_nfs4_file(struct nfs4_file *fi)
 142 {
 143         kref_get(&fi->fi_ref);
 144 }
 145
 146 static struct nfs4_delegation *
 147 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 148 {
 149         struct nfs4_delegation *dp;
 150         struct nfs4_file *fp = stp->st_file;
 151         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 152
 153         dprintk("NFSD alloc_init_deleg\n");
 154         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 155         if (dp == NULL)
 156                 return dp;
 157         INIT_LIST_HEAD(&dp->dl_del_perfile);
 158         INIT_LIST_HEAD(&dp->dl_del_perclnt);
 159         INIT_LIST_HEAD(&dp->dl_recall_lru);
 160         dp->dl_client = clp;
 161         get_nfs4_file(fp);
 162         dp->dl_file = fp;
 163         dp->dl_flock = NULL;
 164         get_file(stp->st_vfs_file);
 165         dp->dl_vfs_file = stp->st_vfs_file;
 166         dp->dl_type = type;
 167         dp->dl_recall.cbr_dp = NULL;
 168         dp->dl_recall.cbr_ident = cb->cb_ident;
 169         dp->dl_recall.cbr_trunc = 0;
 170         dp->dl_stateid.si_boot = boot_time;
 171         dp->dl_stateid.si_stateownerid = current_delegid++;
 172         dp->dl_stateid.si_fileid = 0;
 173         dp->dl_stateid.si_generation = 0;
 174         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 175         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 176                         current_fh->fh_handle.fh_size);
 177         dp->dl_time = 0;
 178         atomic_set(&dp->dl_count, 1);
 179         list_add(&dp->dl_del_perfile, &fp->fi_delegations);
 180         list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
 181         return dp;
 182 }
 183
 184 void
 185 nfs4_put_delegation(struct nfs4_delegation *dp)
 186 {
 187         if (atomic_dec_and_test(&dp->dl_count)) {
 188                 dprintk("NFSD: freeing dp %p\n",dp);
 189                 put_nfs4_file(dp->dl_file);
 190                 kmem_cache_free(deleg_slab, dp);
 191         }
 192 }
 193
 194 /* Remove the associated file_lock first, then remove the delegation.
 195  * lease_modify() is called to remove the FS_LEASE file_lock from
 196  * the i_flock list, eventually calling nfsd's lock_manager
 197  * fl_release_callback.
 198  */
 199 static void
 200 nfs4_close_delegation(struct nfs4_delegation *dp)
 201 {
 202         struct file *filp = dp->dl_vfs_file;
 203
 204         dprintk("NFSD: close_delegation dp %p\n",dp);
 205         dp->dl_vfs_file = NULL;
 206         /* The following nfsd_close may not actually close the file,
 207          * but we want to remove the lease in any case. */
 208         if (dp->dl_flock)
 209                 setlease(filp, F_UNLCK, &dp->dl_flock);
 210         nfsd_close(filp);
 211 }
 212
 213 /* Called under the state lock. */
 214 static void
 215 unhash_delegation(struct nfs4_delegation *dp)
 216 {
 217         list_del_init(&dp->dl_del_perfile);
 218         list_del_init(&dp->dl_del_perclnt);
 219         spin_lock(&recall_lock);
 220         list_del_init(&dp->dl_recall_lru);
 221         spin_unlock(&recall_lock);
 222         nfs4_close_delegation(dp);
 223         nfs4_put_delegation(dp);
 224 }
 225
 226 /*
 227  * SETCLIENTID state
 228  */
 229
 230 /* Hash tables for nfs4_clientid state */
 231 #define CLIENT_HASH_BITS                 4
 232 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 233 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 234
 235 #define clientid_hashval(id) \
 236         ((id) & CLIENT_HASH_MASK)
 237 #define clientstr_hashval(name) \
 238         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
 239 /*
 240  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 241  * used in reboot/reset lease grace period processing
 242  *
 243  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 244  * setclientid_confirmed info.
 245  *
 246  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 247  * setclientid info.
 248  *
 249  * client_lru holds client queue ordered by nfs4_client.cl_time
 250  * for lease renewal.
 251  *
 252  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 253  * for last close replay.
 254  */
 255 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 256 static int reclaim_str_hashtbl_size = 0;
 257 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 258 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 259 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 260 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 261 static struct list_head client_lru;
 262 static struct list_head close_lru;
 263
 264 static inline void
 265 renew_client(struct nfs4_client *clp)
 266 {
 267         /*
 268         * Move client to the end to the LRU list.
 269         */
 270         dprintk("renewing client (clientid %08x/%08x)\n",
 271                         clp->cl_clientid.cl_boot,
 272                         clp->cl_clientid.cl_id);
 273         list_move_tail(&clp->cl_lru, &client_lru);
 274         clp->cl_time = get_seconds();
 275 }
 276
 277 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 278 static int
 279 STALE_CLIENTID(clientid_t *clid)
 280 {
 281         if (clid->cl_boot == boot_time)
 282                 return 0;
 283         dprintk("NFSD stale clientid (%08x/%08x)\n",
 284                         clid->cl_boot, clid->cl_id);
 285         return 1;
 286 }
 287
 288 /*
 289  * XXX Should we use a slab cache ?
 290  * This type of memory management is somewhat inefficient, but we use it
 291  * anyway since SETCLIENTID is not a common operation.
 292  */
 293 static inline struct nfs4_client *
 294 alloc_client(struct xdr_netobj name)
 295 {
 296         struct nfs4_client *clp;
 297
 298         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
 299                 memset(clp, 0, sizeof(*clp));
 300                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
 301                         memcpy(clp->cl_name.data, name.data, name.len);
 302                         clp->cl_name.len = name.len;
 303                 }
 304                 else {
 305                         kfree(clp);
 306                         clp = NULL;
 307                 }
 308         }
 309         return clp;
 310 }
 311
 312 static inline void
 313 free_client(struct nfs4_client *clp)
 314 {
 315         if (clp->cl_cred.cr_group_info)
 316                 put_group_info(clp->cl_cred.cr_group_info);
 317         kfree(clp->cl_name.data);
 318         kfree(clp);
 319 }
 320
 321 void
 322 put_nfs4_client(struct nfs4_client *clp)
 323 {
 324         if (atomic_dec_and_test(&clp->cl_count))
 325                 free_client(clp);
 326 }
 327
 328 static void
 329 expire_client(struct nfs4_client *clp)
 330 {
 331         struct nfs4_stateowner *sop;
 332         struct nfs4_delegation *dp;
 333         struct nfs4_callback *cb = &clp->cl_callback;
 334         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 335         struct list_head reaplist;
 336
 337         dprintk("NFSD: expire_client cl_count %d\n",
 338                             atomic_read(&clp->cl_count));
 339
 340         /* shutdown rpc client, ending any outstanding recall rpcs */
 341         if (atomic_read(&cb->cb_set) == 1 && clnt) {
 342                 rpc_shutdown_client(clnt);
 343                 clnt = clp->cl_callback.cb_client = NULL;
 344         }
 345
 346         INIT_LIST_HEAD(&reaplist);
 347         spin_lock(&recall_lock);
 348         while (!list_empty(&clp->cl_del_perclnt)) {
 349                 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
 350                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 351                                 dp->dl_flock);
 352                 list_del_init(&dp->dl_del_perclnt);
 353                 list_move(&dp->dl_recall_lru, &reaplist);
 354         }
 355         spin_unlock(&recall_lock);
 356         while (!list_empty(&reaplist)) {
 357                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 358                 list_del_init(&dp->dl_recall_lru);
 359                 unhash_delegation(dp);
 360         }
 361         list_del(&clp->cl_idhash);
 362         list_del(&clp->cl_strhash);
 363         list_del(&clp->cl_lru);
 364         while (!list_empty(&clp->cl_perclient)) {
 365                 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
 366                 release_stateowner(sop);
 367         }
 368         put_nfs4_client(clp);
 369 }
 370
 371 static struct nfs4_client *
 372 create_client(struct xdr_netobj name, char *recdir) {
 373         struct nfs4_client *clp;
 374
 375         if (!(clp = alloc_client(name)))
 376                 goto out;
 377         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 378         atomic_set(&clp->cl_count, 1);
 379         atomic_set(&clp->cl_callback.cb_set, 0);
 380         clp->cl_callback.cb_parsed = 0;
 381         INIT_LIST_HEAD(&clp->cl_idhash);
 382         INIT_LIST_HEAD(&clp->cl_strhash);
 383         INIT_LIST_HEAD(&clp->cl_perclient);
 384         INIT_LIST_HEAD(&clp->cl_del_perclnt);
 385         INIT_LIST_HEAD(&clp->cl_lru);
 386 out:
 387         return clp;
 388 }
 389
 390 static void
 391 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
 392         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
 393 }
 394
 395 static void
 396 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
 397         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 398         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 399 }
 400
 401 static void
 402 copy_cred(struct svc_cred *target, struct svc_cred *source) {
 403
 404         target->cr_uid = source->cr_uid;
 405         target->cr_gid = source->cr_gid;
 406         target->cr_group_info = source->cr_group_info;
 407         get_group_info(target->cr_group_info);
 408 }
 409
 410 static inline int
 411 same_name(const char *n1, const char *n2) {
 412         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 413 }
 414
 415 static int
 416 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
 417         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
 418 }
 419
 420 static int
 421 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
 422         return((cl1->cl_boot == cl2->cl_boot) &&
 423                 (cl1->cl_id == cl2->cl_id));
 424 }
 425
 426 /* XXX what about NGROUP */
 427 static int
 428 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
 429         return(cr1->cr_uid == cr2->cr_uid);
 430
 431 }
 432
 433 static void
 434 gen_clid(struct nfs4_client *clp) {
 435         clp->cl_clientid.cl_boot = boot_time;
 436         clp->cl_clientid.cl_id = current_clientid++;
 437 }
 438
 439 static void
 440 gen_confirm(struct nfs4_client *clp) {
 441         struct timespec         tv;
 442         u32 *                   p;
 443
 444         tv = CURRENT_TIME;
 445         p = (u32 *)clp->cl_confirm.data;
 446         *p++ = tv.tv_sec;
 447         *p++ = tv.tv_nsec;
 448 }
 449
 450 static int
 451 check_name(struct xdr_netobj name) {
 452
 453         if (name.len == 0)
 454                 return 0;
 455         if (name.len > NFS4_OPAQUE_LIMIT) {
 456                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
 457                 return 0;
 458         }
 459         return 1;
 460 }
 461
 462 static void
 463 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 464 {
 465         unsigned int idhashval;
 466
 467         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 468         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 469         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 470         list_add_tail(&clp->cl_lru, &client_lru);
 471         clp->cl_time = get_seconds();
 472 }
 473
 474 static void
 475 move_to_confirmed(struct nfs4_client *clp)
 476 {
 477         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 478         unsigned int strhashval;
 479
 480         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 481         list_del_init(&clp->cl_strhash);
 482         list_del_init(&clp->cl_idhash);
 483         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 484         strhashval = clientstr_hashval(clp->cl_recdir);
 485         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 486         renew_client(clp);
 487 }
 488
 489 static struct nfs4_client *
 490 find_confirmed_client(clientid_t *clid)
 491 {
 492         struct nfs4_client *clp;
 493         unsigned int idhashval = clientid_hashval(clid->cl_id);
 494
 495         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 496                 if (cmp_clid(&clp->cl_clientid, clid))
 497                         return clp;
 498         }
 499         return NULL;
 500 }
 501
 502 static struct nfs4_client *
 503 find_unconfirmed_client(clientid_t *clid)
 504 {
 505         struct nfs4_client *clp;
 506         unsigned int idhashval = clientid_hashval(clid->cl_id);
 507
 508         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 509                 if (cmp_clid(&clp->cl_clientid, clid))
 510                         return clp;
 511         }
 512         return NULL;
 513 }
 514
 515 static struct nfs4_client *
 516 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 517 {
 518         struct nfs4_client *clp;
 519
 520         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 521                 if (same_name(clp->cl_recdir, dname))
 522                         return clp;
 523         }
 524         return NULL;
 525 }
 526
 527 static struct nfs4_client *
 528 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 529 {
 530         struct nfs4_client *clp;
 531
 532         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 533                 if (same_name(clp->cl_recdir, dname))
 534                         return clp;
 535         }
 536         return NULL;
 537 }
 538
 539 /* a helper function for parse_callback */
 540 static int
 541 parse_octet(unsigned int *lenp, char **addrp)
 542 {
 543         unsigned int len = *lenp;
 544         char *p = *addrp;
 545         int n = -1;
 546         char c;
 547
 548         for (;;) {
 549                 if (!len)
 550                         break;
 551                 len--;
 552                 c = *p++;
 553                 if (c == '.')
 554                         break;
 555                 if ((c < '0') || (c > '9')) {
 556                         n = -1;
 557                         break;
 558                 }
 559                 if (n < 0)
 560                         n = 0;
 561                 n = (n * 10) + (c - '0');
 562                 if (n > 255) {
 563                         n = -1;
 564                         break;
 565                 }
 566         }
 567         *lenp = len;
 568         *addrp = p;
 569         return n;
 570 }
 571
 572 /* parse and set the setclientid ipv4 callback address */
 573 static int
 574 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 575 {
 576         int temp = 0;
 577         u32 cbaddr = 0;
 578         u16 cbport = 0;
 579         u32 addrlen = addr_len;
 580         char *addr = addr_val;
 581         int i, shift;
 582
 583         /* ipaddress */
 584         shift = 24;
 585         for(i = 4; i > 0  ; i--) {
 586                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 587                         return 0;
 588                 }
 589                 cbaddr |= (temp << shift);
 590                 if (shift > 0)
 591                 shift -= 8;
 592         }
 593         *cbaddrp = cbaddr;
 594
 595         /* port */
 596         shift = 8;
 597         for(i = 2; i > 0  ; i--) {
 598                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 599                         return 0;
 600                 }
 601                 cbport |= (temp << shift);
 602                 if (shift > 0)
 603                         shift -= 8;
 604         }
 605         *cbportp = cbport;
 606         return 1;
 607 }
 608
 609 static void
 610 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 611 {
 612         struct nfs4_callback *cb = &clp->cl_callback;
 613
 614         /* Currently, we only support tcp for the callback channel */
 615         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 616                 goto out_err;
 617
 618         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 619                          &cb->cb_addr, &cb->cb_port)))
 620                 goto out_err;
 621         cb->cb_prog = se->se_callback_prog;
 622         cb->cb_ident = se->se_callback_ident;
 623         cb->cb_parsed = 1;
 624         return;
 625 out_err:
 626         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 627                 "will not receive delegations\n",
 628                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 629
 630         cb->cb_parsed = 0;
 631         return;
 632 }
 633
 634 /*
 635  * RFC 3010 has a complex implmentation description of processing a
 636  * SETCLIENTID request consisting of 5 bullets, labeled as
 637  * CASE0 - CASE4 below.
 638  *
 639  * NOTES:
 640  *      callback information will be processed in a future patch
 641  *
 642  *      an unconfirmed record is added when:
 643  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
 644  *      CASE 1: confirmed record found with matching name, principal,
 645  *              verifier, and clientid.
 646  *      CASE 2: confirmed record found with matching name, principal,
 647  *              and there is no unconfirmed record with matching
 648  *              name and principal
 649  *
 650  *      an unconfirmed record is replaced when:
 651  *      CASE 3: confirmed record found with matching name, principal,
 652  *              and an unconfirmed record is found with matching
 653  *              name, principal, and with clientid and
 654  *              confirm that does not match the confirmed record.
 655  *      CASE 4: there is no confirmed record with matching name and
 656  *              principal. there is an unconfirmed record with
 657  *              matching name, principal.
 658  *
 659  *      an unconfirmed record is deleted when:
 660  *      CASE 1: an unconfirmed record that matches input name, verifier,
 661  *              and confirmed clientid.
 662  *      CASE 4: any unconfirmed records with matching name and principal
 663  *              that exist after an unconfirmed record has been replaced
 664  *              as described above.
 665  *
 666  */
 667 int
 668 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
 669 {
 670         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 671         struct xdr_netobj       clname = {
 672                 .len = setclid->se_namelen,
 673                 .data = setclid->se_name,
 674         };
 675         nfs4_verifier           clverifier = setclid->se_verf;
 676         unsigned int            strhashval;
 677         struct nfs4_client      *conf, *unconf, *new;
 678         int                     status;
 679         char                    dname[HEXDIR_LEN];
 680
 681         status = nfserr_inval;
 682         if (!check_name(clname))
 683                 goto out;
 684
 685         status = nfs4_make_rec_clidname(dname, &clname);
 686         if (status)
 687                 goto out;
 688
 689         /*
 690          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 691          * We get here on a DRC miss.
 692          */
 693
 694         strhashval = clientstr_hashval(dname);
 695
 696         nfs4_lock_state();
 697         conf = find_confirmed_client_by_str(dname, strhashval);
 698         if (conf) {
 699                 /*
 700                  * CASE 0:
 701                  * clname match, confirmed, different principal
 702                  * or different ip_address
 703                  */
 704                 status = nfserr_clid_inuse;
 705                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
 706                                 || conf->cl_addr != ip_addr) {
 707                         printk("NFSD: setclientid: string in use by client"
 708                         "(clientid %08x/%08x)\n",
 709                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
 710                         goto out;
 711                 }
 712         }
 713         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 714         status = nfserr_resource;
 715         if (!conf) {
 716                 /*
 717                  * CASE 4:
 718                  * placed first, because it is the normal case.
 719                  */
 720                 if (unconf)
 721                         expire_client(unconf);
 722                 new = create_client(clname, dname);
 723                 if (new == NULL)
 724                         goto out;
 725                 copy_verf(new, &clverifier);
 726                 new->cl_addr = ip_addr;
 727                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 728                 gen_clid(new);
 729                 gen_confirm(new);
 730                 gen_callback(new, setclid);
 731                 add_to_unconfirmed(new, strhashval);
 732         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
 733                 /*
 734                  * CASE 1:
 735                  * cl_name match, confirmed, principal match
 736                  * verifier match: probable callback update
 737                  *
 738                  * remove any unconfirmed nfs4_client with
 739                  * matching cl_name, cl_verifier, and cl_clientid
 740                  *
 741                  * create and insert an unconfirmed nfs4_client with same
 742                  * cl_name, cl_verifier, and cl_clientid as existing
 743                  * nfs4_client,  but with the new callback info and a
 744                  * new cl_confirm
 745                  */
 746                 if (unconf) {
 747                         /* Note this is removing unconfirmed {*x***},
 748                          * which is stronger than RFC recommended {vxc**}.
 749                          * This has the advantage that there is at most
 750                          * one {*x***} in either list at any time.
 751                          */
 752                         expire_client(unconf);
 753                 }
 754                 new = create_client(clname, dname);
 755                 if (new == NULL)
 756                         goto out;
 757                 copy_verf(new,&conf->cl_verifier);
 758                 new->cl_addr = ip_addr;
 759                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 760                 copy_clid(new, conf);
 761                 gen_confirm(new);
 762                 gen_callback(new, setclid);
 763                 add_to_unconfirmed(new,strhashval);
 764         } else if (!unconf) {
 765                 /*
 766                  * CASE 2:
 767                  * clname match, confirmed, principal match
 768                  * verfier does not match
 769                  * no unconfirmed. create a new unconfirmed nfs4_client
 770                  * using input clverifier, clname, and callback info
 771                  * and generate a new cl_clientid and cl_confirm.
 772                  */
 773                 new = create_client(clname, dname);
 774                 if (new == NULL)
 775                         goto out;
 776                 copy_verf(new,&clverifier);
 777                 new->cl_addr = ip_addr;
 778                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 779                 gen_clid(new);
 780                 gen_confirm(new);
 781                 gen_callback(new, setclid);
 782                 add_to_unconfirmed(new, strhashval);
 783         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
 784                 /*
 785                  * CASE3:
 786                  * confirmed found (name, principal match)
 787                  * confirmed verifier does not match input clverifier
 788                  *
 789                  * unconfirmed found (name match)
 790                  * confirmed->cl_confirm != unconfirmed->cl_confirm
 791                  *
 792                  * remove unconfirmed.
 793                  *
 794                  * create an unconfirmed nfs4_client
 795                  * with same cl_name as existing confirmed nfs4_client,
 796                  * but with new callback info, new cl_clientid,
 797                  * new cl_verifier and a new cl_confirm
 798                  */
 799                 expire_client(unconf);
 800                 new = create_client(clname, dname);
 801                 if (new == NULL)
 802                         goto out;
 803                 copy_verf(new,&clverifier);
 804                 new->cl_addr = ip_addr;
 805                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
 806                 gen_clid(new);
 807                 gen_confirm(new);
 808                 gen_callback(new, setclid);
 809                 add_to_unconfirmed(new, strhashval);
 810         } else {
 811                 /* No cases hit !!! */
 812                 status = nfserr_inval;
 813                 goto out;
 814
 815         }
 816         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 817         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 818         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 819         status = nfs_ok;
 820 out:
 821         nfs4_unlock_state();
 822         return status;
 823 }
 824
 825
 826 /*
 827  * RFC 3010 has a complex implmentation description of processing a
 828  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
 829  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
 830  *
 831  * NOTE: callback information will be processed here in a future patch
 832  */
 833 int
 834 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
 835 {
 836         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
 837         struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
 838         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 839         clientid_t * clid = &setclientid_confirm->sc_clientid;
 840         int status;
 841
 842         if (STALE_CLIENTID(clid))
 843                 return nfserr_stale_clientid;
 844         /*
 845          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 846          * We get here on a DRC miss.
 847          */
 848
 849         nfs4_lock_state();
 850         clp = find_confirmed_client(clid);
 851         if (clp) {
 852                 status = nfserr_clid_inuse;
 853                 if (clp->cl_addr != ip_addr) {
 854                         printk("NFSD: setclientid: string in use by client"
 855                         "(clientid %08x/%08x)\n",
 856                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 857                         goto out;
 858                 }
 859                 conf = clp;
 860         }
 861         clp = find_unconfirmed_client(clid);
 862         if (clp) {
 863                 status = nfserr_clid_inuse;
 864                 if (clp->cl_addr != ip_addr) {
 865                         printk("NFSD: setclientid: string in use by client"
 866                         "(clientid %08x/%08x)\n",
 867                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 868                         goto out;
 869                 }
 870                 unconf = clp;
 871         }
 872         if ((conf && unconf) &&
 873             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
 874             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
 875             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
 876             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
 877                 /* CASE 1:
 878                 * unconf record that matches input clientid and input confirm.
 879                 * conf record that matches input clientid.
 880                 * conf and unconf records match names, verifiers
 881                 */
 882                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
 883                         status = nfserr_clid_inuse;
 884                 else {
 885                         /* XXX: We just turn off callbacks until we can handle
 886                           * change request correctly. */
 887                         clp = conf;
 888                         clp->cl_callback.cb_parsed = 0;
 889                         gen_confirm(clp);
 890                         expire_client(unconf);
 891                         status = nfs_ok;
 892
 893                 }
 894         } else if ((conf && !unconf) ||
 895             ((conf && unconf) &&
 896              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
 897               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
 898                 /* CASE 2:
 899                  * conf record that matches input clientid.
 900                  * if unconf record matches input clientid, then
 901                  * unconf->cl_name or unconf->cl_verifier don't match the
 902                  * conf record.
 903                  */
 904                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
 905                         status = nfserr_clid_inuse;
 906                 } else {
 907                         clp = conf;
 908                         status = nfs_ok;
 909                 }
 910         } else if (!conf && unconf
 911                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
 912                 /* CASE 3:
 913                  * conf record not found.
 914                  * unconf record found.
 915                  * unconf->cl_confirm matches input confirm
 916                  */
 917                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 918                         status = nfserr_clid_inuse;
 919                 } else {
 920                         unsigned int hash =
 921                                 clientstr_hashval(unconf->cl_recdir);
 922                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 923                                                                         hash);
 924                         if (conf) {
 925                                 expire_client(conf);
 926                         }
 927                         clp = unconf;
 928                         move_to_confirmed(unconf);
 929                         status = nfs_ok;
 930                 }
 931         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
 932             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
 933                                                                 &confirm)))) {
 934                 /* CASE 4:
 935                  * conf record not found, or if conf, conf->cl_confirm does not
 936                  * match input confirm.
 937                  * unconf record not found, or if unconf, unconf->cl_confirm
 938                  * does not match input confirm.
 939                  */
 940                 status = nfserr_stale_clientid;
 941         } else {
 942                 /* check that we have hit one of the cases...*/
 943                 status = nfserr_clid_inuse;
 944         }
 945 out:
 946         if (!status)
 947                 nfsd4_probe_callback(clp);
 948         nfs4_unlock_state();
 949         return status;
 950 }
 951
 952 /*
 953  * Open owner state (share locks)
 954  */
 955
 956 /* hash tables for nfs4_stateowner */
 957 #define OWNER_HASH_BITS              8
 958 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 959 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 960
 961 #define ownerid_hashval(id) \
 962         ((id) & OWNER_HASH_MASK)
 963 #define ownerstr_hashval(clientid, ownername) \
 964         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 965
 966 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 967 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 968
 969 /* hash table for nfs4_file */
 970 #define FILE_HASH_BITS                   8
 971 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 972 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 973 /* hash table for (open)nfs4_stateid */
 974 #define STATEID_HASH_BITS              10
 975 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 976 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 977
 978 #define file_hashval(x) \
 979         hash_ptr(x, FILE_HASH_BITS)
 980 #define stateid_hashval(owner_id, file_id)  \
 981         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 982
 983 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 984 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 985
 986 /* OPEN Share state helper functions */
 987 static inline struct nfs4_file *
 988 alloc_init_file(struct inode *ino)
 989 {
 990         struct nfs4_file *fp;
 991         unsigned int hashval = file_hashval(ino);
 992
 993         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 994         if (fp) {
 995                 kref_init(&fp->fi_ref);
 996                 INIT_LIST_HEAD(&fp->fi_hash);
 997                 INIT_LIST_HEAD(&fp->fi_stateids);
 998                 INIT_LIST_HEAD(&fp->fi_delegations);
 999                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1000                 fp->fi_inode = igrab(ino);
1001                 fp->fi_id = current_fileid++;
1002                 return fp;
1003         }
1004         return NULL;
1005 }
1006
1007 static void
1008 nfsd4_free_slab(kmem_cache_t **slab)
1009 {
1010         int status;
1011
1012         if (*slab == NULL)
1013                 return;
1014         status = kmem_cache_destroy(*slab);
1015         *slab = NULL;
1016         WARN_ON(status);
1017 }
1018
1019 static void
1020 nfsd4_free_slabs(void)
1021 {
1022         nfsd4_free_slab(&stateowner_slab);
1023         nfsd4_free_slab(&file_slab);
1024         nfsd4_free_slab(&stateid_slab);
1025         nfsd4_free_slab(&deleg_slab);
1026 }
1027
1028 static int
1029 nfsd4_init_slabs(void)
1030 {
1031         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1032                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1033         if (stateowner_slab == NULL)
1034                 goto out_nomem;
1035         file_slab = kmem_cache_create("nfsd4_files",
1036                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1037         if (file_slab == NULL)
1038                 goto out_nomem;
1039         stateid_slab = kmem_cache_create("nfsd4_stateids",
1040                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1041         if (stateid_slab == NULL)
1042                 goto out_nomem;
1043         deleg_slab = kmem_cache_create("nfsd4_delegations",
1044                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1045         if (deleg_slab == NULL)
1046                 goto out_nomem;
1047         return 0;
1048 out_nomem:
1049         nfsd4_free_slabs();
1050         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1051         return -ENOMEM;
1052 }
1053
1054 void
1055 nfs4_free_stateowner(struct kref *kref)
1056 {
1057         struct nfs4_stateowner *sop =
1058                 container_of(kref, struct nfs4_stateowner, so_ref);
1059         kfree(sop->so_owner.data);
1060         kmem_cache_free(stateowner_slab, sop);
1061 }
1062
1063 static inline struct nfs4_stateowner *
1064 alloc_stateowner(struct xdr_netobj *owner)
1065 {
1066         struct nfs4_stateowner *sop;
1067
1068         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1069                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1070                         memcpy(sop->so_owner.data, owner->data, owner->len);
1071                         sop->so_owner.len = owner->len;
1072                         kref_init(&sop->so_ref);
1073                         return sop;
1074                 }
1075                 kmem_cache_free(stateowner_slab, sop);
1076         }
1077         return NULL;
1078 }
1079
1080 static struct nfs4_stateowner *
1081 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1082         struct nfs4_stateowner *sop;
1083         struct nfs4_replay *rp;
1084         unsigned int idhashval;
1085
1086         if (!(sop = alloc_stateowner(&open->op_owner)))
1087                 return NULL;
1088         idhashval = ownerid_hashval(current_ownerid);
1089         INIT_LIST_HEAD(&sop->so_idhash);
1090         INIT_LIST_HEAD(&sop->so_strhash);
1091         INIT_LIST_HEAD(&sop->so_perclient);
1092         INIT_LIST_HEAD(&sop->so_perfilestate);
1093         INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
1094         INIT_LIST_HEAD(&sop->so_close_lru);
1095         sop->so_time = 0;
1096         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1097         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1098         list_add(&sop->so_perclient, &clp->cl_perclient);
1099         sop->so_is_open_owner = 1;
1100         sop->so_id = current_ownerid++;
1101         sop->so_client = clp;
1102         sop->so_seqid = open->op_seqid;
1103         sop->so_confirmed = 0;
1104         rp = &sop->so_replay;
1105         rp->rp_status = NFSERR_SERVERFAULT;
1106         rp->rp_buflen = 0;
1107         rp->rp_buf = rp->rp_ibuf;
1108         return sop;
1109 }
1110
1111 static void
1112 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1113 {
1114         struct nfs4_stateowner *lock_sop;
1115
1116         while (!list_empty(&open_stp->st_perlockowner)) {
1117                 lock_sop = list_entry(open_stp->st_perlockowner.next,
1118                                 struct nfs4_stateowner, so_perlockowner);
1119                 /* list_del(&open_stp->st_perlockowner);  */
1120                 BUG_ON(lock_sop->so_is_open_owner);
1121                 release_stateowner(lock_sop);
1122         }
1123 }
1124
1125 static void
1126 unhash_stateowner(struct nfs4_stateowner *sop)
1127 {
1128         struct nfs4_stateid *stp;
1129
1130         list_del(&sop->so_idhash);
1131         list_del(&sop->so_strhash);
1132         if (sop->so_is_open_owner)
1133                 list_del(&sop->so_perclient);
1134         list_del(&sop->so_perlockowner);
1135         while (!list_empty(&sop->so_perfilestate)) {
1136                 stp = list_entry(sop->so_perfilestate.next,
1137                         struct nfs4_stateid, st_perfilestate);
1138                 if (sop->so_is_open_owner)
1139                         release_stateid(stp, OPEN_STATE);
1140                 else
1141                         release_stateid(stp, LOCK_STATE);
1142         }
1143 }
1144
1145 static void
1146 release_stateowner(struct nfs4_stateowner *sop)
1147 {
1148         unhash_stateowner(sop);
1149         list_del(&sop->so_close_lru);
1150         nfs4_put_stateowner(sop);
1151 }
1152
1153 static inline void
1154 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1155         struct nfs4_stateowner *sop = open->op_stateowner;
1156         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1157
1158         INIT_LIST_HEAD(&stp->st_hash);
1159         INIT_LIST_HEAD(&stp->st_perfilestate);
1160         INIT_LIST_HEAD(&stp->st_perlockowner);
1161         INIT_LIST_HEAD(&stp->st_perfile);
1162         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1163         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1164         list_add(&stp->st_perfile, &fp->fi_stateids);
1165         stp->st_stateowner = sop;
1166         get_nfs4_file(fp);
1167         stp->st_file = fp;
1168         stp->st_stateid.si_boot = boot_time;
1169         stp->st_stateid.si_stateownerid = sop->so_id;
1170         stp->st_stateid.si_fileid = fp->fi_id;
1171         stp->st_stateid.si_generation = 0;
1172         stp->st_access_bmap = 0;
1173         stp->st_deny_bmap = 0;
1174         __set_bit(open->op_share_access, &stp->st_access_bmap);
1175         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1176 }
1177
1178 static void
1179 release_stateid(struct nfs4_stateid *stp, int flags)
1180 {
1181         struct file *filp = stp->st_vfs_file;
1182
1183         list_del(&stp->st_hash);
1184         list_del(&stp->st_perfile);
1185         list_del(&stp->st_perfilestate);
1186         if (flags & OPEN_STATE) {
1187                 release_stateid_lockowners(stp);
1188                 stp->st_vfs_file = NULL;
1189                 nfsd_close(filp);
1190         } else if (flags & LOCK_STATE)
1191                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1192         put_nfs4_file(stp->st_file);
1193         kmem_cache_free(stateid_slab, stp);
1194         stp = NULL;
1195 }
1196
1197 static void
1198 move_to_close_lru(struct nfs4_stateowner *sop)
1199 {
1200         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1201
1202         unhash_stateowner(sop);
1203         list_add_tail(&sop->so_close_lru, &close_lru);
1204         sop->so_time = get_seconds();
1205 }
1206
1207 static void
1208 release_state_owner(struct nfs4_stateid *stp, int flag)
1209 {
1210         struct nfs4_stateowner *sop = stp->st_stateowner;
1211
1212         dprintk("NFSD: release_state_owner\n");
1213         release_stateid(stp, flag);
1214
1215         /* place unused nfs4_stateowners on so_close_lru list to be
1216          * released by the laundromat service after the lease period
1217          * to enable us to handle CLOSE replay
1218          */
1219         if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1220                 move_to_close_lru(sop);
1221 }
1222
1223 static int
1224 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1225         return ((sop->so_owner.len == owner->len) &&
1226          !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1227           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1228 }
1229
1230 static struct nfs4_stateowner *
1231 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1232 {
1233         struct nfs4_stateowner *so = NULL;
1234
1235         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1236                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1237                         return so;
1238         }
1239         return NULL;
1240 }
1241
1242 /* search file_hashtbl[] for file */
1243 static struct nfs4_file *
1244 find_file(struct inode *ino)
1245 {
1246         unsigned int hashval = file_hashval(ino);
1247         struct nfs4_file *fp;
1248
1249         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1250                 if (fp->fi_inode == ino) {
1251                         get_nfs4_file(fp);
1252                         return fp;
1253                 }
1254         }
1255         return NULL;
1256 }
1257
1258 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1259 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1260
1261 static void
1262 set_access(unsigned int *access, unsigned long bmap) {
1263         int i;
1264
1265         *access = 0;
1266         for (i = 1; i < 4; i++) {
1267                 if (test_bit(i, &bmap))
1268                         *access |= i;
1269         }
1270 }
1271
1272 static void
1273 set_deny(unsigned int *deny, unsigned long bmap) {
1274         int i;
1275
1276         *deny = 0;
1277         for (i = 0; i < 4; i++) {
1278                 if (test_bit(i, &bmap))
1279                         *deny |= i ;
1280         }
1281 }
1282
1283 static int
1284 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1285         unsigned int access, deny;
1286
1287         set_access(&access, stp->st_access_bmap);
1288         set_deny(&deny, stp->st_deny_bmap);
1289         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1290                 return 0;
1291         return 1;
1292 }
1293
1294 /*
1295  * Called to check deny when READ with all zero stateid or
1296  * WRITE with all zero or all one stateid
1297  */
1298 static int
1299 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1300 {
1301         struct inode *ino = current_fh->fh_dentry->d_inode;
1302         struct nfs4_file *fp;
1303         struct nfs4_stateid *stp;
1304         int ret;
1305
1306         dprintk("NFSD: nfs4_share_conflict\n");
1307
1308         fp = find_file(ino);
1309         if (!fp)
1310                 return nfs_ok;
1311         ret = nfserr_share_denied;
1312         /* Search for conflicting share reservations */
1313         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1314                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1315                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1316                         goto out;
1317         }
1318         ret = nfs_ok;
1319 out:
1320         put_nfs4_file(fp);
1321         return ret;
1322 }
1323
1324 static inline void
1325 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1326 {
1327         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1328                 put_write_access(filp->f_dentry->d_inode);
1329                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1330         }
1331 }
1332
1333 /*
1334  * Recall a delegation
1335  */
1336 static int
1337 do_recall(void *__dp)
1338 {
1339         struct nfs4_delegation *dp = __dp;
1340
1341         daemonize("nfsv4-recall");
1342
1343         nfsd4_cb_recall(dp);
1344         return 0;
1345 }
1346
1347 /*
1348  * Spawn a thread to perform a recall on the delegation represented
1349  * by the lease (file_lock)
1350  *
1351  * Called from break_lease() with lock_kernel() held.
1352  * Note: we assume break_lease will only call this *once* for any given
1353  * lease.
1354  */
1355 static
1356 void nfsd_break_deleg_cb(struct file_lock *fl)
1357 {
1358         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1359         struct task_struct *t;
1360
1361         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1362         if (!dp)
1363                 return;
1364
1365         /* We're assuming the state code never drops its reference
1366          * without first removing the lease.  Since we're in this lease
1367          * callback (and since the lease code is serialized by the kernel
1368          * lock) we know the server hasn't removed the lease yet, we know
1369          * it's safe to take a reference: */
1370         atomic_inc(&dp->dl_count);
1371
1372         spin_lock(&recall_lock);
1373         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1374         spin_unlock(&recall_lock);
1375
1376         /* only place dl_time is set. protected by lock_kernel*/
1377         dp->dl_time = get_seconds();
1378
1379         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1380         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1381
1382         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1383         if (IS_ERR(t)) {
1384                 struct nfs4_client *clp = dp->dl_client;
1385
1386                 printk(KERN_INFO "NFSD: Callback thread failed for "
1387                         "for client (clientid %08x/%08x)\n",
1388                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1389                 nfs4_put_delegation(dp);
1390         }
1391 }
1392
1393 /*
1394  * The file_lock is being reapd.
1395  *
1396  * Called by locks_free_lock() with lock_kernel() held.
1397  */
1398 static
1399 void nfsd_release_deleg_cb(struct file_lock *fl)
1400 {
1401         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1402
1403         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1404
1405         if (!(fl->fl_flags & FL_LEASE) || !dp)
1406                 return;
1407         dp->dl_flock = NULL;
1408 }
1409
1410 /*
1411  * Set the delegation file_lock back pointer.
1412  *
1413  * Called from __setlease() with lock_kernel() held.
1414  */
1415 static
1416 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1417 {
1418         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1419
1420         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1421         if (!dp)
1422                 return;
1423         dp->dl_flock = new;
1424 }
1425
1426 /*
1427  * Called from __setlease() with lock_kernel() held
1428  */
1429 static
1430 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1431 {
1432         struct nfs4_delegation *onlistd =
1433                 (struct nfs4_delegation *)onlist->fl_owner;
1434         struct nfs4_delegation *tryd =
1435                 (struct nfs4_delegation *)try->fl_owner;
1436
1437         if (onlist->fl_lmops != try->fl_lmops)
1438                 return 0;
1439
1440         return onlistd->dl_client == tryd->dl_client;
1441 }
1442
1443
1444 static
1445 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1446 {
1447         if (arg & F_UNLCK)
1448                 return lease_modify(onlist, arg);
1449         else
1450                 return -EAGAIN;
1451 }
1452
1453 static struct lock_manager_operations nfsd_lease_mng_ops = {
1454         .fl_break = nfsd_break_deleg_cb,
1455         .fl_release_private = nfsd_release_deleg_cb,
1456         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1457         .fl_mylease = nfsd_same_client_deleg_cb,
1458         .fl_change = nfsd_change_deleg_cb,
1459 };
1460
1461
1462 /*
1463  * nfsd4_process_open1()
1464  *      lookup stateowner.
1465  *              found:
1466  *                      check confirmed
1467  *                              confirmed:
1468  *                                      check seqid
1469  *                              not confirmed:
1470  *                                      delete owner
1471  *                                      create new owner
1472  *              notfound:
1473  *                      verify clientid
1474  *                      create new owner
1475  *
1476  * called with nfs4_lock_state() held.
1477  */
1478 int
1479 nfsd4_process_open1(struct nfsd4_open *open)
1480 {
1481         int status;
1482         clientid_t *clientid = &open->op_clientid;
1483         struct nfs4_client *clp = NULL;
1484         unsigned int strhashval;
1485         struct nfs4_stateowner *sop = NULL;
1486
1487         status = nfserr_inval;
1488         if (!check_name(open->op_owner))
1489                 goto out;
1490
1491         if (STALE_CLIENTID(&open->op_clientid))
1492                 return nfserr_stale_clientid;
1493
1494         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1495         sop = find_openstateowner_str(strhashval, open);
1496         if (sop) {
1497                 open->op_stateowner = sop;
1498                 /* check for replay */
1499                 if (open->op_seqid == sop->so_seqid){
1500                         if (sop->so_replay.rp_buflen)
1501                                 return NFSERR_REPLAY_ME;
1502                         else {
1503                                 /* The original OPEN failed so spectacularly
1504                                  * that we don't even have replay data saved!
1505                                  * Therefore, we have no choice but to continue
1506                                  * processing this OPEN; presumably, we'll
1507                                  * fail again for the same reason.
1508                                  */
1509                                 dprintk("nfsd4_process_open1:"
1510                                         " replay with no replay cache\n");
1511                                 goto renew;
1512                         }
1513                 } else if (sop->so_confirmed) {
1514                         if (open->op_seqid == sop->so_seqid + 1)
1515                                 goto renew;
1516                         status = nfserr_bad_seqid;
1517                         goto out;
1518                 } else {
1519                         /* If we get here, we received an OPEN for an
1520                          * unconfirmed nfs4_stateowner. Since the seqid's are
1521                          * different, purge the existing nfs4_stateowner, and
1522                          * instantiate a new one.
1523                          */
1524                         clp = sop->so_client;
1525                         release_stateowner(sop);
1526                 }
1527         } else {
1528                 /* nfs4_stateowner not found.
1529                  * Verify clientid and instantiate new nfs4_stateowner.
1530                  * If verify fails this is presumably the result of the
1531                  * client's lease expiring.
1532                  */
1533                 status = nfserr_expired;
1534                 clp = find_confirmed_client(clientid);
1535                 if (clp == NULL)
1536                         goto out;
1537         }
1538         status = nfserr_resource;
1539         sop = alloc_init_open_stateowner(strhashval, clp, open);
1540         if (sop == NULL)
1541                 goto out;
1542         open->op_stateowner = sop;
1543 renew:
1544         status = nfs_ok;
1545         renew_client(sop->so_client);
1546 out:
1547         if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1548                 status = nfserr_reclaim_bad;
1549         return status;
1550 }
1551
1552 static inline int
1553 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1554 {
1555         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1556                 return nfserr_openmode;
1557         else
1558                 return nfs_ok;
1559 }
1560
1561 static struct nfs4_delegation *
1562 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1563 {
1564         struct nfs4_delegation *dp;
1565
1566         list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
1567                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1568                         return dp;
1569         }
1570         return NULL;
1571 }
1572
1573 static int
1574 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1575                 struct nfs4_delegation **dp)
1576 {
1577         int flags;
1578         int status = nfserr_bad_stateid;
1579
1580         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1581         if (*dp == NULL)
1582                 goto out;
1583         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1584                                                 RD_STATE : WR_STATE;
1585         status = nfs4_check_delegmode(*dp, flags);
1586         if (status)
1587                 *dp = NULL;
1588 out:
1589         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1590                 return nfs_ok;
1591         if (status)
1592                 return status;
1593         open->op_stateowner->so_confirmed = 1;
1594         return nfs_ok;
1595 }
1596
1597 static int
1598 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1599 {
1600         struct nfs4_stateid *local;
1601         int status = nfserr_share_denied;
1602         struct nfs4_stateowner *sop = open->op_stateowner;
1603
1604         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1605                 /* ignore lock owners */
1606                 if (local->st_stateowner->so_is_open_owner == 0)
1607                         continue;
1608                 /* remember if we have seen this open owner */
1609                 if (local->st_stateowner == sop)
1610                         *stpp = local;
1611                 /* check for conflicting share reservations */
1612                 if (!test_share(local, open))
1613                         goto out;
1614         }
1615         status = 0;
1616 out:
1617         return status;
1618 }
1619
1620 static inline struct nfs4_stateid *
1621 nfs4_alloc_stateid(void)
1622 {
1623         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1624 }
1625
1626 static int
1627 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1628                 struct nfs4_delegation *dp,
1629                 struct svc_fh *cur_fh, int flags)
1630 {
1631         struct nfs4_stateid *stp;
1632
1633         stp = nfs4_alloc_stateid();
1634         if (stp == NULL)
1635                 return nfserr_resource;
1636
1637         if (dp) {
1638                 get_file(dp->dl_vfs_file);
1639                 stp->st_vfs_file = dp->dl_vfs_file;
1640         } else {
1641                 int status;
1642                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1643                                 &stp->st_vfs_file);
1644                 if (status) {
1645                         if (status == nfserr_dropit)
1646                                 status = nfserr_jukebox;
1647                         kmem_cache_free(stateid_slab, stp);
1648                         return status;
1649                 }
1650         }
1651         *stpp = stp;
1652         return 0;
1653 }
1654
1655 static inline int
1656 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1657                 struct nfsd4_open *open)
1658 {
1659         struct iattr iattr = {
1660                 .ia_valid = ATTR_SIZE,
1661                 .ia_size = 0,
1662         };
1663         if (!open->op_truncate)
1664                 return 0;
1665         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1666                 return -EINVAL;
1667         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1668 }
1669
1670 static int
1671 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1672 {
1673         struct file *filp = stp->st_vfs_file;
1674         struct inode *inode = filp->f_dentry->d_inode;
1675         unsigned int share_access;
1676         int status;
1677
1678         set_access(&share_access, stp->st_access_bmap);
1679         share_access = ~share_access;
1680         share_access &= open->op_share_access;
1681
1682         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1683                 return nfsd4_truncate(rqstp, cur_fh, open);
1684
1685         status = get_write_access(inode);
1686         if (status)
1687                 return nfserrno(status);
1688         status = nfsd4_truncate(rqstp, cur_fh, open);
1689         if (status) {
1690                 put_write_access(inode);
1691                 return status;
1692         }
1693         /* remember the open */
1694         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1695         set_bit(open->op_share_access, &stp->st_access_bmap);
1696         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1697
1698         return nfs_ok;
1699 }
1700
1701
1702 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
1703 static void
1704 nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1705 {
1706         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1707                 if (*status)
1708                         *status = nfserr_reclaim_bad;
1709                 else {
1710                         open->op_stateowner->so_confirmed = 1;
1711                         open->op_stateowner->so_seqid--;
1712                 }
1713         }
1714 }
1715
1716 /*
1717  * Attempt to hand out a delegation.
1718  */
1719 static void
1720 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1721 {
1722         struct nfs4_delegation *dp;
1723         struct nfs4_stateowner *sop = stp->st_stateowner;
1724         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1725         struct file_lock fl, *flp = &fl;
1726         int status, flag = 0;
1727
1728         flag = NFS4_OPEN_DELEGATE_NONE;
1729         open->op_recall = 0;
1730         switch (open->op_claim_type) {
1731                 case NFS4_OPEN_CLAIM_PREVIOUS:
1732                         if (!atomic_read(&cb->cb_set))
1733                                 open->op_recall = 1;
1734                         flag = open->op_delegate_type;
1735                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1736                                 goto out;
1737                         break;
1738                 case NFS4_OPEN_CLAIM_NULL:
1739                         /* Let's not give out any delegations till everyone's
1740                          * had the chance to reclaim theirs.... */
1741                         if (nfs4_in_grace())
1742                                 goto out;
1743                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1744                                 goto out;
1745                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1746                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1747                         else
1748                                 flag = NFS4_OPEN_DELEGATE_READ;
1749                         break;
1750                 default:
1751                         goto out;
1752         }
1753
1754         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1755         if (dp == NULL) {
1756                 flag = NFS4_OPEN_DELEGATE_NONE;
1757                 goto out;
1758         }
1759         locks_init_lock(&fl);
1760         fl.fl_lmops = &nfsd_lease_mng_ops;
1761         fl.fl_flags = FL_LEASE;
1762         fl.fl_end = OFFSET_MAX;
1763         fl.fl_owner =  (fl_owner_t)dp;
1764         fl.fl_file = stp->st_vfs_file;
1765         fl.fl_pid = current->tgid;
1766
1767         /* setlease checks to see if delegation should be handed out.
1768          * the lock_manager callbacks fl_mylease and fl_change are used
1769          */
1770         if ((status = setlease(stp->st_vfs_file,
1771                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1772                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1773                 unhash_delegation(dp);
1774                 flag = NFS4_OPEN_DELEGATE_NONE;
1775                 goto out;
1776         }
1777
1778         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1779
1780         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1781                      dp->dl_stateid.si_boot,
1782                      dp->dl_stateid.si_stateownerid,
1783                      dp->dl_stateid.si_fileid,
1784                      dp->dl_stateid.si_generation);
1785 out:
1786         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1787                         && flag == NFS4_OPEN_DELEGATE_NONE
1788                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1789                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1790         open->op_delegate_type = flag;
1791 }
1792
1793 /*
1794  * called with nfs4_lock_state() held.
1795  */
1796 int
1797 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1798 {
1799         struct nfs4_file *fp = NULL;
1800         struct inode *ino = current_fh->fh_dentry->d_inode;
1801         struct nfs4_stateid *stp = NULL;
1802         struct nfs4_delegation *dp = NULL;
1803         int status;
1804
1805         status = nfserr_inval;
1806         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1807                 goto out;
1808         /*
1809          * Lookup file; if found, lookup stateid and check open request,
1810          * and check for delegations in the process of being recalled.
1811          * If not found, create the nfs4_file struct
1812          */
1813         fp = find_file(ino);
1814         if (fp) {
1815                 if ((status = nfs4_check_open(fp, open, &stp)))
1816                         goto out;
1817                 status = nfs4_check_deleg(fp, open, &dp);
1818                 if (status)
1819                         goto out;
1820         } else {
1821                 status = nfserr_bad_stateid;
1822                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1823                         goto out;
1824                 status = nfserr_resource;
1825                 fp = alloc_init_file(ino);
1826                 if (fp == NULL)
1827                         goto out;
1828         }
1829
1830         /*
1831          * OPEN the file, or upgrade an existing OPEN.
1832          * If truncate fails, the OPEN fails.
1833          */
1834         if (stp) {
1835                 /* Stateid was found, this is an OPEN upgrade */
1836                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1837                 if (status)
1838                         goto out;
1839         } else {
1840                 /* Stateid was not found, this is a new OPEN */
1841                 int flags = 0;
1842                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1843                         flags = MAY_WRITE;
1844                 else
1845                         flags = MAY_READ;
1846                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1847                 if (status)
1848                         goto out;
1849                 init_stateid(stp, fp, open);
1850                 status = nfsd4_truncate(rqstp, current_fh, open);
1851                 if (status) {
1852                         release_stateid(stp, OPEN_STATE);
1853                         goto out;
1854                 }
1855         }
1856         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1857
1858         /*
1859         * Attempt to hand out a delegation. No error return, because the
1860         * OPEN succeeds even if we fail.
1861         */
1862         nfs4_open_delegation(current_fh, open, stp);
1863
1864         status = nfs_ok;
1865
1866         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1867                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1868                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1869 out:
1870         if (fp)
1871                 put_nfs4_file(fp);
1872         /* CLAIM_PREVIOUS has different error returns */
1873         nfs4_set_claim_prev(open, &status);
1874         /*
1875         * To finish the open response, we just need to set the rflags.
1876         */
1877         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1878         if (!open->op_stateowner->so_confirmed)
1879                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1880
1881         return status;
1882 }
1883
1884 static struct workqueue_struct *laundry_wq;
1885 static struct work_struct laundromat_work;
1886 static void laundromat_main(void *);
1887 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1888
1889 int
1890 nfsd4_renew(clientid_t *clid)
1891 {
1892         struct nfs4_client *clp;
1893         int status;
1894
1895         nfs4_lock_state();
1896         dprintk("process_renew(%08x/%08x): starting\n",
1897                         clid->cl_boot, clid->cl_id);
1898         status = nfserr_stale_clientid;
1899         if (STALE_CLIENTID(clid))
1900                 goto out;
1901         clp = find_confirmed_client(clid);
1902         status = nfserr_expired;
1903         if (clp == NULL) {
1904                 /* We assume the client took too long to RENEW. */
1905                 dprintk("nfsd4_renew: clientid not found!\n");
1906                 goto out;
1907         }
1908         renew_client(clp);
1909         status = nfserr_cb_path_down;
1910         if (!list_empty(&clp->cl_del_perclnt)
1911                         && !atomic_read(&clp->cl_callback.cb_set))
1912                 goto out;
1913         status = nfs_ok;
1914 out:
1915         nfs4_unlock_state();
1916         return status;
1917 }
1918
1919 static void
1920 end_grace(void)
1921 {
1922         dprintk("NFSD: end of grace period\n");
1923         in_grace = 0;
1924 }
1925
1926 static time_t
1927 nfs4_laundromat(void)
1928 {
1929         struct nfs4_client *clp;
1930         struct nfs4_stateowner *sop;
1931         struct nfs4_delegation *dp;
1932         struct list_head *pos, *next, reaplist;
1933         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1934         time_t t, clientid_val = NFSD_LEASE_TIME;
1935         time_t u, test_val = NFSD_LEASE_TIME;
1936
1937         nfs4_lock_state();
1938
1939         dprintk("NFSD: laundromat service - starting\n");
1940         if (in_grace)
1941                 end_grace();
1942         list_for_each_safe(pos, next, &client_lru) {
1943                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1944                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1945                         t = clp->cl_time - cutoff;
1946                         if (clientid_val > t)
1947                                 clientid_val = t;
1948                         break;
1949                 }
1950                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1951                         clp->cl_clientid.cl_id);
1952                 expire_client(clp);
1953         }
1954         INIT_LIST_HEAD(&reaplist);
1955         spin_lock(&recall_lock);
1956         list_for_each_safe(pos, next, &del_recall_lru) {
1957                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1958                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1959                         u = dp->dl_time - cutoff;
1960                         if (test_val > u)
1961                                 test_val = u;
1962                         break;
1963                 }
1964                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1965                                     dp, dp->dl_flock);
1966                 list_move(&dp->dl_recall_lru, &reaplist);
1967         }
1968         spin_unlock(&recall_lock);
1969         list_for_each_safe(pos, next, &reaplist) {
1970                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1971                 list_del_init(&dp->dl_recall_lru);
1972                 unhash_delegation(dp);
1973         }
1974         test_val = NFSD_LEASE_TIME;
1975         list_for_each_safe(pos, next, &close_lru) {
1976                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1977                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1978                         u = sop->so_time - cutoff;
1979                         if (test_val > u)
1980                                 test_val = u;
1981                         break;
1982                 }
1983                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1984                         sop->so_id);
1985                 list_del(&sop->so_close_lru);
1986                 nfs4_put_stateowner(sop);
1987         }
1988         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1989                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1990         nfs4_unlock_state();
1991         return clientid_val;
1992 }
1993
1994 void
1995 laundromat_main(void *not_used)
1996 {
1997         time_t t;
1998
1999         t = nfs4_laundromat();
2000         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
2001         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
2002 }
2003
2004 /* search ownerid_hashtbl[] and close_lru for stateid owner
2005  * (stateid->si_stateownerid)
2006  */
2007 static struct nfs4_stateowner *
2008 find_openstateowner_id(u32 st_id, int flags) {
2009         struct nfs4_stateowner *local = NULL;
2010
2011         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
2012         if (flags & CLOSE_STATE) {
2013                 list_for_each_entry(local, &close_lru, so_close_lru) {
2014                         if (local->so_id == st_id)
2015                                 return local;
2016                 }
2017         }
2018         return NULL;
2019 }
2020
2021 static inline int
2022 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2023 {
2024         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2025 }
2026
2027 static int
2028 STALE_STATEID(stateid_t *stateid)
2029 {
2030         if (stateid->si_boot == boot_time)
2031                 return 0;
2032         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2033                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2034                 stateid->si_generation);
2035         return 1;
2036 }
2037
2038 static inline int
2039 access_permit_read(unsigned long access_bmap)
2040 {
2041         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2042                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2043                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2044 }
2045
2046 static inline int
2047 access_permit_write(unsigned long access_bmap)
2048 {
2049         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2050                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2051 }
2052
2053 static
2054 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2055 {
2056         int status = nfserr_openmode;
2057
2058         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2059                 goto out;
2060         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2061                 goto out;
2062         status = nfs_ok;
2063 out:
2064         return status;
2065 }
2066
2067 static inline int
2068 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2069 {
2070         /* Trying to call delegreturn with a special stateid? Yuch: */
2071         if (!(flags & (RD_STATE | WR_STATE)))
2072                 return nfserr_bad_stateid;
2073         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2074                 return nfs_ok;
2075         else if (nfs4_in_grace()) {
2076                 /* Answer in remaining cases depends on existance of
2077                  * conflicting state; so we must wait out the grace period. */
2078                 return nfserr_grace;
2079         } else if (flags & WR_STATE)
2080                 return nfs4_share_conflict(current_fh,
2081                                 NFS4_SHARE_DENY_WRITE);
2082         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2083                 return nfs4_share_conflict(current_fh,
2084                                 NFS4_SHARE_DENY_READ);
2085 }
2086
2087 /*
2088  * Allow READ/WRITE during grace period on recovered state only for files
2089  * that are not able to provide mandatory locking.
2090  */
2091 static inline int
2092 io_during_grace_disallowed(struct inode *inode, int flags)
2093 {
2094         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2095                 && MANDATORY_LOCK(inode);
2096 }
2097
2098 /*
2099 * Checks for stateid operations
2100 */
2101 int
2102 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2103 {
2104         struct nfs4_stateid *stp = NULL;
2105         struct nfs4_delegation *dp = NULL;
2106         stateid_t *stidp;
2107         struct inode *ino = current_fh->fh_dentry->d_inode;
2108         int status;
2109
2110         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2111                 stateid->si_boot, stateid->si_stateownerid,
2112                 stateid->si_fileid, stateid->si_generation);
2113         if (filpp)
2114                 *filpp = NULL;
2115
2116         if (io_during_grace_disallowed(ino, flags))
2117                 return nfserr_grace;
2118
2119         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2120                 return check_special_stateids(current_fh, stateid, flags);
2121
2122         /* STALE STATEID */
2123         status = nfserr_stale_stateid;
2124         if (STALE_STATEID(stateid))
2125                 goto out;
2126
2127         /* BAD STATEID */
2128         status = nfserr_bad_stateid;
2129         if (!stateid->si_fileid) { /* delegation stateid */
2130                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2131                         dprintk("NFSD: delegation stateid not found\n");
2132                         if (nfs4_in_grace())
2133                                 status = nfserr_grace;
2134                         goto out;
2135                 }
2136                 stidp = &dp->dl_stateid;
2137         } else { /* open or lock stateid */
2138                 if (!(stp = find_stateid(stateid, flags))) {
2139                         dprintk("NFSD: open or lock stateid not found\n");
2140                         if (nfs4_in_grace())
2141                                 status = nfserr_grace;
2142                         goto out;
2143                 }
2144                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2145                         goto out;
2146                 if (!stp->st_stateowner->so_confirmed)
2147                         goto out;
2148                 stidp = &stp->st_stateid;
2149         }
2150         if (stateid->si_generation > stidp->si_generation)
2151                 goto out;
2152
2153         /* OLD STATEID */
2154         status = nfserr_old_stateid;
2155         if (stateid->si_generation < stidp->si_generation)
2156                 goto out;
2157         if (stp) {
2158                 if ((status = nfs4_check_openmode(stp,flags)))
2159                         goto out;
2160                 renew_client(stp->st_stateowner->so_client);
2161                 if (filpp)
2162                         *filpp = stp->st_vfs_file;
2163         } else if (dp) {
2164                 if ((status = nfs4_check_delegmode(dp, flags)))
2165                         goto out;
2166                 renew_client(dp->dl_client);
2167                 if (flags & DELEG_RET)
2168                         unhash_delegation(dp);
2169                 if (filpp)
2170                         *filpp = dp->dl_vfs_file;
2171         }
2172         status = nfs_ok;
2173 out:
2174         return status;
2175 }
2176
2177
2178 /*
2179  * Checks for sequence id mutating operations.
2180  */
2181 static int
2182 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
2183 {
2184         int status;
2185         struct nfs4_stateid *stp;
2186         struct nfs4_stateowner *sop;
2187
2188         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2189                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2190                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2191                 stateid->si_generation);
2192
2193         *stpp = NULL;
2194         *sopp = NULL;
2195
2196         status = nfserr_bad_stateid;
2197         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2198                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2199                 goto out;
2200         }
2201
2202         status = nfserr_stale_stateid;
2203         if (STALE_STATEID(stateid))
2204                 goto out;
2205         /*
2206         * We return BAD_STATEID if filehandle doesn't match stateid,
2207         * the confirmed flag is incorrecly set, or the generation
2208         * number is incorrect.
2209         * If there is no entry in the openfile table for this id,
2210         * we can't always return BAD_STATEID;
2211         * this might be a retransmitted CLOSE which has arrived after
2212         * the openfile has been released.
2213         */
2214         if (!(stp = find_stateid(stateid, flags)))
2215                 goto no_nfs4_stateid;
2216
2217         status = nfserr_bad_stateid;
2218
2219         /* for new lock stateowners:
2220          * check that the lock->v.new.open_stateid
2221          * refers to an open stateowner
2222          *
2223          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2224          * as the open_stateid->st_stateowner->so_client->clientid
2225          */
2226         if (lockclid) {
2227                 struct nfs4_stateowner *sop = stp->st_stateowner;
2228                 struct nfs4_client *clp = sop->so_client;
2229
2230                 if (!sop->so_is_open_owner)
2231                         goto out;
2232                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2233                         goto out;
2234         }
2235
2236         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2237                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2238                 goto out;
2239         }
2240
2241         *stpp = stp;
2242         *sopp = sop = stp->st_stateowner;
2243
2244         /*
2245         *  We now validate the seqid and stateid generation numbers.
2246         *  For the moment, we ignore the possibility of
2247         *  generation number wraparound.
2248         */
2249         if (seqid != sop->so_seqid + 1)
2250                 goto check_replay;
2251
2252         if (sop->so_confirmed) {
2253                 if (flags & CONFIRM) {
2254                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2255                         goto out;
2256                 }
2257         }
2258         else {
2259                 if (!(flags & CONFIRM)) {
2260                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2261                         goto out;
2262                 }
2263         }
2264         if (stateid->si_generation > stp->st_stateid.si_generation) {
2265                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2266                 goto out;
2267         }
2268
2269         status = nfserr_old_stateid;
2270         if (stateid->si_generation < stp->st_stateid.si_generation) {
2271                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2272                 goto out;
2273         }
2274         /* XXX renew the client lease here */
2275         status = nfs_ok;
2276
2277 out:
2278         return status;
2279
2280 no_nfs4_stateid:
2281
2282         /*
2283         * We determine whether this is a bad stateid or a replay,
2284         * starting by trying to look up the stateowner.
2285         * If stateowner is not found - stateid is bad.
2286         */
2287         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2288                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2289                 status = nfserr_bad_stateid;
2290                 goto out;
2291         }
2292         *sopp = sop;
2293
2294 check_replay:
2295         if (seqid == sop->so_seqid) {
2296                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2297                 /* indicate replay to calling function */
2298                 status = NFSERR_REPLAY_ME;
2299         } else  {
2300                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2301
2302                 *sopp = NULL;
2303                 status = nfserr_bad_seqid;
2304         }
2305         goto out;
2306 }
2307
2308 int
2309 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2310 {
2311         int status;
2312         struct nfs4_stateowner *sop;
2313         struct nfs4_stateid *stp;
2314
2315         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2316                         (int)current_fh->fh_dentry->d_name.len,
2317                         current_fh->fh_dentry->d_name.name);
2318
2319         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2320                 goto out;
2321
2322         nfs4_lock_state();
2323
2324         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2325                                         &oc->oc_req_stateid,
2326                                         CHECK_FH | CONFIRM | OPEN_STATE,
2327                                         &oc->oc_stateowner, &stp, NULL)))
2328                 goto out;
2329
2330         sop = oc->oc_stateowner;
2331         sop->so_confirmed = 1;
2332         update_stateid(&stp->st_stateid);
2333         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2334         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2335                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2336                          stp->st_stateid.si_boot,
2337                          stp->st_stateid.si_stateownerid,
2338                          stp->st_stateid.si_fileid,
2339                          stp->st_stateid.si_generation);
2340 out:
2341         if (oc->oc_stateowner)
2342                 nfs4_get_stateowner(oc->oc_stateowner);
2343         nfs4_unlock_state();
2344         return status;
2345 }
2346
2347
2348 /*
2349  * unset all bits in union bitmap (bmap) that
2350  * do not exist in share (from successful OPEN_DOWNGRADE)
2351  */
2352 static void
2353 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2354 {
2355         int i;
2356         for (i = 1; i < 4; i++) {
2357                 if ((i & access) != i)
2358                         __clear_bit(i, bmap);
2359         }
2360 }
2361
2362 static void
2363 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2364 {
2365         int i;
2366         for (i = 0; i < 4; i++) {
2367                 if ((i & deny) != i)
2368                         __clear_bit(i, bmap);
2369         }
2370 }
2371
2372 int
2373 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2374 {
2375         int status;
2376         struct nfs4_stateid *stp;
2377         unsigned int share_access;
2378
2379         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2380                         (int)current_fh->fh_dentry->d_name.len,
2381                         current_fh->fh_dentry->d_name.name);
2382
2383         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2384                 return nfserr_inval;
2385
2386         nfs4_lock_state();
2387         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2388                                         &od->od_stateid,
2389                                         CHECK_FH | OPEN_STATE,
2390                                         &od->od_stateowner, &stp, NULL)))
2391                 goto out;
2392
2393         status = nfserr_inval;
2394         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2395                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2396                         stp->st_access_bmap, od->od_share_access);
2397                 goto out;
2398         }
2399         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2400                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2401                         stp->st_deny_bmap, od->od_share_deny);
2402                 goto out;
2403         }
2404         set_access(&share_access, stp->st_access_bmap);
2405         nfs4_file_downgrade(stp->st_vfs_file,
2406                             share_access & ~od->od_share_access);
2407
2408         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2409         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2410
2411         update_stateid(&stp->st_stateid);
2412         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2413         status = nfs_ok;
2414 out:
2415         if (od->od_stateowner)
2416                 nfs4_get_stateowner(od->od_stateowner);
2417         nfs4_unlock_state();
2418         return status;
2419 }
2420
2421 /*
2422  * nfs4_unlock_state() called after encode
2423  */
2424 int
2425 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2426 {
2427         int status;
2428         struct nfs4_stateid *stp;
2429
2430         dprintk("NFSD: nfsd4_close on file %.*s\n",
2431                         (int)current_fh->fh_dentry->d_name.len,
2432                         current_fh->fh_dentry->d_name.name);
2433
2434         nfs4_lock_state();
2435         /* check close_lru for replay */
2436         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2437                                         &close->cl_stateid,
2438                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2439                                         &close->cl_stateowner, &stp, NULL)))
2440                 goto out;
2441         /*
2442         *  Return success, but first update the stateid.
2443         */
2444         status = nfs_ok;
2445         update_stateid(&stp->st_stateid);
2446         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2447
2448         /* release_state_owner() calls nfsd_close() if needed */
2449         release_state_owner(stp, OPEN_STATE);
2450 out:
2451         if (close->cl_stateowner)
2452                 nfs4_get_stateowner(close->cl_stateowner);
2453         nfs4_unlock_state();
2454         return status;
2455 }
2456
2457 int
2458 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2459 {
2460         int status;
2461
2462         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2463                 goto out;
2464
2465         nfs4_lock_state();
2466         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2467         nfs4_unlock_state();
2468 out:
2469         return status;
2470 }
2471
2472
2473 /*
2474  * Lock owner state (byte-range locks)
2475  */
2476 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2477 #define LOCK_HASH_BITS              8
2478 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2479 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2480
2481 #define lockownerid_hashval(id) \
2482         ((id) & LOCK_HASH_MASK)
2483
2484 static inline unsigned int
2485 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2486                 struct xdr_netobj *ownername)
2487 {
2488         return (file_hashval(inode) + cl_id
2489                         + opaque_hashval(ownername->data, ownername->len))
2490                 & LOCK_HASH_MASK;
2491 }
2492
2493 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2494 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2495 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2496
2497 static struct nfs4_stateid *
2498 find_stateid(stateid_t *stid, int flags)
2499 {
2500         struct nfs4_stateid *local = NULL;
2501         u32 st_id = stid->si_stateownerid;
2502         u32 f_id = stid->si_fileid;
2503         unsigned int hashval;
2504
2505         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2506         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2507                 hashval = stateid_hashval(st_id, f_id);
2508                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2509                         if ((local->st_stateid.si_stateownerid == st_id) &&
2510                             (local->st_stateid.si_fileid == f_id))
2511                                 return local;
2512                 }
2513         }
2514         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2515                 hashval = stateid_hashval(st_id, f_id);
2516                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2517                         if ((local->st_stateid.si_stateownerid == st_id) &&
2518                             (local->st_stateid.si_fileid == f_id))
2519                                 return local;
2520                 }
2521         } else
2522                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2523         return NULL;
2524 }
2525
2526 static struct nfs4_delegation *
2527 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2528 {
2529         struct nfs4_file *fp;
2530         struct nfs4_delegation *dl;
2531
2532         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2533                     stid->si_boot, stid->si_stateownerid,
2534                     stid->si_fileid, stid->si_generation);
2535
2536         fp = find_file(ino);
2537         if (!fp)
2538                 return NULL;
2539         dl = find_delegation_file(fp, stid);
2540         put_nfs4_file(fp);
2541         return dl;
2542 }
2543
2544 /*
2545  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2546  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2547  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2548  * locking, this prevents us from being completely protocol-compliant.  The
2549  * real solution to this problem is to start using unsigned file offsets in
2550  * the VFS, but this is a very deep change!
2551  */
2552 static inline void
2553 nfs4_transform_lock_offset(struct file_lock *lock)
2554 {
2555         if (lock->fl_start < 0)
2556                 lock->fl_start = OFFSET_MAX;
2557         if (lock->fl_end < 0)
2558                 lock->fl_end = OFFSET_MAX;
2559 }
2560
2561 static int
2562 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2563 {
2564         struct nfs4_stateowner *local = NULL;
2565         int status = 0;
2566
2567         if (hashval >= LOCK_HASH_SIZE)
2568                 goto out;
2569         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2570                 if (local == sop) {
2571                         status = 1;
2572                         goto out;
2573                 }
2574         }
2575 out:
2576         return status;
2577 }
2578
2579
2580 static inline void
2581 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2582 {
2583         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2584         unsigned int hval = lockownerid_hashval(sop->so_id);
2585
2586         deny->ld_sop = NULL;
2587         if (nfs4_verify_lock_stateowner(sop, hval)) {
2588                 kref_get(&sop->so_ref);
2589                 deny->ld_sop = sop;
2590                 deny->ld_clientid = sop->so_client->cl_clientid;
2591         }
2592         deny->ld_start = fl->fl_start;
2593         deny->ld_length = ~(u64)0;
2594         if (fl->fl_end != ~(u64)0)
2595                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2596         deny->ld_type = NFS4_READ_LT;
2597         if (fl->fl_type != F_RDLCK)
2598                 deny->ld_type = NFS4_WRITE_LT;
2599 }
2600
2601 static struct nfs4_stateowner *
2602 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2603 {
2604         struct nfs4_stateowner *local = NULL;
2605         int i;
2606
2607         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2608                 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2609                         if (!cmp_owner_str(local, owner, clid))
2610                                 continue;
2611                         return local;
2612                 }
2613         }
2614         return NULL;
2615 }
2616
2617 static struct nfs4_stateowner *
2618 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2619                 struct xdr_netobj *owner)
2620 {
2621         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2622         struct nfs4_stateowner *op;
2623
2624         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2625                 if (cmp_owner_str(op, owner, clid))
2626                         return op;
2627         }
2628         return NULL;
2629 }
2630
2631 /*
2632  * Alloc a lock owner structure.
2633  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2634  * occured.
2635  *
2636  * strhashval = lock_ownerstr_hashval
2637  * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2638  */
2639
2640 static struct nfs4_stateowner *
2641 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2642         struct nfs4_stateowner *sop;
2643         struct nfs4_replay *rp;
2644         unsigned int idhashval;
2645
2646         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2647                 return NULL;
2648         idhashval = lockownerid_hashval(current_ownerid);
2649         INIT_LIST_HEAD(&sop->so_idhash);
2650         INIT_LIST_HEAD(&sop->so_strhash);
2651         INIT_LIST_HEAD(&sop->so_perclient);
2652         INIT_LIST_HEAD(&sop->so_perfilestate);
2653         INIT_LIST_HEAD(&sop->so_perlockowner);
2654         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2655         sop->so_time = 0;
2656         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2657         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2658         list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2659         sop->so_is_open_owner = 0;
2660         sop->so_id = current_ownerid++;
2661         sop->so_client = clp;
2662         sop->so_seqid = lock->lk_new_lock_seqid - 1;
2663         sop->so_confirmed = 1;
2664         rp = &sop->so_replay;
2665         rp->rp_status = NFSERR_SERVERFAULT;
2666         rp->rp_buflen = 0;
2667         rp->rp_buf = rp->rp_ibuf;
2668         return sop;
2669 }
2670
2671 static struct nfs4_stateid *
2672 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2673 {
2674         struct nfs4_stateid *stp;
2675         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2676
2677         stp = nfs4_alloc_stateid();
2678         if (stp == NULL)
2679                 goto out;
2680         INIT_LIST_HEAD(&stp->st_hash);
2681         INIT_LIST_HEAD(&stp->st_perfile);
2682         INIT_LIST_HEAD(&stp->st_perfilestate);
2683         INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2684         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2685         list_add(&stp->st_perfile, &fp->fi_stateids);
2686         list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2687         stp->st_stateowner = sop;
2688         get_nfs4_file(fp);
2689         stp->st_file = fp;
2690         stp->st_stateid.si_boot = boot_time;
2691         stp->st_stateid.si_stateownerid = sop->so_id;
2692         stp->st_stateid.si_fileid = fp->fi_id;
2693         stp->st_stateid.si_generation = 0;
2694         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2695         stp->st_access_bmap = open_stp->st_access_bmap;
2696         stp->st_deny_bmap = open_stp->st_deny_bmap;
2697
2698 out:
2699         return stp;
2700 }
2701
2702 static int
2703 check_lock_length(u64 offset, u64 length)
2704 {
2705         return ((length == 0)  || ((length != ~(u64)0) &&
2706              LOFF_OVERFLOW(offset, length)));
2707 }
2708
2709 /*
2710  *  LOCK operation
2711  */
2712 int
2713 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2714 {
2715         struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2716         struct nfs4_stateid *lock_stp;
2717         struct file *filp;
2718         struct file_lock file_lock;
2719         struct file_lock *conflock;
2720         int status = 0;
2721         unsigned int strhashval;
2722
2723         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2724                 (long long) lock->lk_offset,
2725                 (long long) lock->lk_length);
2726
2727         if (nfs4_in_grace() && !lock->lk_reclaim)
2728                 return nfserr_grace;
2729         if (!nfs4_in_grace() && lock->lk_reclaim)
2730                 return nfserr_no_grace;
2731
2732         if (check_lock_length(lock->lk_offset, lock->lk_length))
2733                  return nfserr_inval;
2734
2735         nfs4_lock_state();
2736
2737         if (lock->lk_is_new) {
2738         /*
2739          * Client indicates that this is a new lockowner.
2740          * Use open owner and open stateid to create lock owner and lock
2741          * stateid.
2742          */
2743                 struct nfs4_stateid *open_stp = NULL;
2744                 struct nfs4_file *fp;
2745
2746                 status = nfserr_stale_clientid;
2747                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2748                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2749                         goto out;
2750                 }
2751
2752                 /* is the new lock seqid presented by the client zero? */
2753                 status = nfserr_bad_seqid;
2754                 if (lock->v.new.lock_seqid != 0)
2755                         goto out;
2756
2757                 /* validate and update open stateid and open seqid */
2758                 status = nfs4_preprocess_seqid_op(current_fh,
2759                                         lock->lk_new_open_seqid,
2760                                         &lock->lk_new_open_stateid,
2761                                         CHECK_FH | OPEN_STATE,
2762                                         &open_sop, &open_stp,
2763                                         &lock->v.new.clientid);
2764                 if (status) {
2765                         if (lock->lk_reclaim)
2766                                 status = nfserr_reclaim_bad;
2767                         goto out;
2768                 }
2769                 /* create lockowner and lock stateid */
2770                 fp = open_stp->st_file;
2771                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2772                                 open_sop->so_client->cl_clientid.cl_id,
2773                                 &lock->v.new.owner);
2774                 /*
2775                  * If we already have this lock owner, the client is in
2776                  * error (or our bookeeping is wrong!)
2777                  * for asking for a 'new lock'.
2778                  */
2779                 status = nfserr_bad_stateid;
2780                 lock_sop = find_lockstateowner(&lock->v.new.owner,
2781                                                 &lock->v.new.clientid);
2782                 if (lock_sop)
2783                         goto out;
2784                 status = nfserr_resource;
2785                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2786                         goto out;
2787                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2788                                                 fp, open_stp)) == NULL) {
2789                         release_stateowner(lock->lk_stateowner);
2790                         lock->lk_stateowner = NULL;
2791                         goto out;
2792                 }
2793                 /* bump the open seqid used to create the lock */
2794                 open_sop->so_seqid++;
2795         } else {
2796                 /* lock (lock owner + lock stateid) already exists */
2797                 status = nfs4_preprocess_seqid_op(current_fh,
2798                                        lock->lk_old_lock_seqid,
2799                                        &lock->lk_old_lock_stateid,
2800                                        CHECK_FH | LOCK_STATE,
2801                                        &lock->lk_stateowner, &lock_stp, NULL);
2802                 if (status)
2803                         goto out;
2804         }
2805         /* lock->lk_stateowner and lock_stp have been created or found */
2806         filp = lock_stp->st_vfs_file;
2807
2808         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2809                 printk("NFSD: nfsd4_lock: permission denied!\n");
2810                 goto out;
2811         }
2812
2813         locks_init_lock(&file_lock);
2814         switch (lock->lk_type) {
2815                 case NFS4_READ_LT:
2816                 case NFS4_READW_LT:
2817                         file_lock.fl_type = F_RDLCK;
2818                 break;
2819                 case NFS4_WRITE_LT:
2820                 case NFS4_WRITEW_LT:
2821                         file_lock.fl_type = F_WRLCK;
2822                 break;
2823                 default:
2824                         status = nfserr_inval;
2825                 goto out;
2826         }
2827         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2828         file_lock.fl_pid = current->tgid;
2829         file_lock.fl_file = filp;
2830         file_lock.fl_flags = FL_POSIX;
2831
2832         file_lock.fl_start = lock->lk_offset;
2833         if ((lock->lk_length == ~(u64)0) ||
2834                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2835                 file_lock.fl_end = ~(u64)0;
2836         else
2837                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2838         nfs4_transform_lock_offset(&file_lock);
2839
2840         /*
2841         * Try to lock the file in the VFS.
2842         * Note: locks.c uses the BKL to protect the inode's lock list.
2843         */
2844
2845         status = posix_lock_file(filp, &file_lock);
2846         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2847                 file_lock.fl_ops->fl_release_private(&file_lock);
2848         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2849         switch (-status) {
2850         case 0: /* success! */
2851                 update_stateid(&lock_stp->st_stateid);
2852                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2853                                 sizeof(stateid_t));
2854                 goto out;
2855         case (EAGAIN):
2856                 goto conflicting_lock;
2857         case (EDEADLK):
2858                 status = nfserr_deadlock;
2859         default:
2860                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2861                 goto out_destroy_new_stateid;
2862         }
2863
2864 conflicting_lock:
2865         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2866         status = nfserr_denied;
2867         /* XXX There is a race here. Future patch needed to provide
2868          * an atomic posix_lock_and_test_file
2869          */
2870         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2871                 status = nfserr_serverfault;
2872                 goto out;
2873         }
2874         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2875
2876 out_destroy_new_stateid:
2877         if (lock->lk_is_new) {
2878                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2879         /*
2880         * An error encountered after instantiation of the new
2881         * stateid has forced us to destroy it.
2882         */
2883                 if (!seqid_mutating_err(status))
2884                         open_sop->so_seqid--;
2885
2886                 release_state_owner(lock_stp, LOCK_STATE);
2887         }
2888 out:
2889         if (lock->lk_stateowner)
2890                 nfs4_get_stateowner(lock->lk_stateowner);
2891         nfs4_unlock_state();
2892         return status;
2893 }
2894
2895 /*
2896  * LOCKT operation
2897  */
2898 int
2899 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2900 {
2901         struct inode *inode;
2902         struct file file;
2903         struct file_lock file_lock;
2904         struct file_lock *conflicting_lock;
2905         int status;
2906
2907         if (nfs4_in_grace())
2908                 return nfserr_grace;
2909
2910         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2911                  return nfserr_inval;
2912
2913         lockt->lt_stateowner = NULL;
2914         nfs4_lock_state();
2915
2916         status = nfserr_stale_clientid;
2917         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2918                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2919                 goto out;
2920         }
2921
2922         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2923                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2924                 if (status == nfserr_symlink)
2925                         status = nfserr_inval;
2926                 goto out;
2927         }
2928
2929         inode = current_fh->fh_dentry->d_inode;
2930         locks_init_lock(&file_lock);
2931         switch (lockt->lt_type) {
2932                 case NFS4_READ_LT:
2933                 case NFS4_READW_LT:
2934                         file_lock.fl_type = F_RDLCK;
2935                 break;
2936                 case NFS4_WRITE_LT:
2937                 case NFS4_WRITEW_LT:
2938                         file_lock.fl_type = F_WRLCK;
2939                 break;
2940                 default:
2941                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2942                         status = nfserr_inval;
2943                 goto out;
2944         }
2945
2946         lockt->lt_stateowner = find_lockstateowner_str(inode,
2947                         &lockt->lt_clientid, &lockt->lt_owner);
2948         if (lockt->lt_stateowner)
2949                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2950         file_lock.fl_pid = current->tgid;
2951         file_lock.fl_flags = FL_POSIX;
2952
2953         file_lock.fl_start = lockt->lt_offset;
2954         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2955                 file_lock.fl_end = ~(u64)0;
2956         else
2957                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2958
2959         nfs4_transform_lock_offset(&file_lock);
2960
2961         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2962          * since LOCKT doesn't require an OPEN, and therefore a struct
2963          * file may not exist, pass posix_test_lock a struct file with
2964          * only the dentry:inode set.
2965          */
2966         memset(&file, 0, sizeof (struct file));
2967         file.f_dentry = current_fh->fh_dentry;
2968
2969         status = nfs_ok;
2970         conflicting_lock = posix_test_lock(&file, &file_lock);
2971         if (conflicting_lock) {
2972                 status = nfserr_denied;
2973                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2974         }
2975 out:
2976         nfs4_unlock_state();
2977         return status;
2978 }
2979
2980 int
2981 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2982 {
2983         struct nfs4_stateid *stp;
2984         struct file *filp = NULL;
2985         struct file_lock file_lock;
2986         int status;
2987
2988         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2989                 (long long) locku->lu_offset,
2990                 (long long) locku->lu_length);
2991
2992         if (check_lock_length(locku->lu_offset, locku->lu_length))
2993                  return nfserr_inval;
2994
2995         nfs4_lock_state();
2996
2997         if ((status = nfs4_preprocess_seqid_op(current_fh,
2998                                         locku->lu_seqid,
2999                                         &locku->lu_stateid,
3000                                         CHECK_FH | LOCK_STATE,
3001                                         &locku->lu_stateowner, &stp, NULL)))
3002                 goto out;
3003
3004         filp = stp->st_vfs_file;
3005         BUG_ON(!filp);
3006         locks_init_lock(&file_lock);
3007         file_lock.fl_type = F_UNLCK;
3008         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3009         file_lock.fl_pid = current->tgid;
3010         file_lock.fl_file = filp;
3011         file_lock.fl_flags = FL_POSIX;
3012         file_lock.fl_start = locku->lu_offset;
3013
3014         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
3015                 file_lock.fl_end = ~(u64)0;
3016         else
3017                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
3018         nfs4_transform_lock_offset(&file_lock);
3019
3020         /*
3021         *  Try to unlock the file in the VFS.
3022         */
3023         status = posix_lock_file(filp, &file_lock);
3024         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
3025                 file_lock.fl_ops->fl_release_private(&file_lock);
3026         if (status) {
3027                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
3028                 goto out_nfserr;
3029         }
3030         /*
3031         * OK, unlock succeeded; the only thing left to do is update the stateid.
3032         */
3033         update_stateid(&stp->st_stateid);
3034         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3035
3036 out:
3037         if (locku->lu_stateowner)
3038                 nfs4_get_stateowner(locku->lu_stateowner);
3039         nfs4_unlock_state();
3040         return status;
3041
3042 out_nfserr:
3043         status = nfserrno(status);
3044         goto out;
3045 }
3046
3047 /*
3048  * returns
3049  *      1: locks held by lockowner
3050  *      0: no locks held by lockowner
3051  */
3052 static int
3053 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3054 {
3055         struct file_lock **flpp;
3056         struct inode *inode = filp->f_dentry->d_inode;
3057         int status = 0;
3058
3059         lock_kernel();
3060         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3061                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3062                         status = 1;
3063                         goto out;
3064         }
3065 out:
3066         unlock_kernel();
3067         return status;
3068 }
3069
3070 int
3071 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3072 {
3073         clientid_t *clid = &rlockowner->rl_clientid;
3074         struct nfs4_stateowner *local = NULL;
3075         struct xdr_netobj *owner = &rlockowner->rl_owner;
3076         int status;
3077
3078         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3079                 clid->cl_boot, clid->cl_id);
3080
3081         /* XXX check for lease expiration */
3082
3083         status = nfserr_stale_clientid;
3084         if (STALE_CLIENTID(clid)) {
3085                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3086                 return status;
3087         }
3088
3089         nfs4_lock_state();
3090
3091         status = nfs_ok;
3092         local = find_lockstateowner(owner, clid);
3093         if (local) {
3094                 struct nfs4_stateid *stp;
3095
3096                 /* check for any locks held by any stateid
3097                  * associated with the (lock) stateowner */
3098                 status = nfserr_locks_held;
3099                 list_for_each_entry(stp, &local->so_perfilestate,
3100                                 st_perfilestate) {
3101                         if (check_for_locks(stp->st_vfs_file, local))
3102                                 goto out;
3103                 }
3104                 /* no locks held by (lock) stateowner */
3105                 status = nfs_ok;
3106                 release_stateowner(local);
3107         }
3108 out:
3109         nfs4_unlock_state();
3110         return status;
3111 }
3112
3113 static inline struct nfs4_client_reclaim *
3114 alloc_reclaim(void)
3115 {
3116         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3117 }
3118
3119 /*
3120  * failure => all reset bets are off, nfserr_no_grace...
3121  */
3122 static int
3123 nfs4_client_to_reclaim(char *name)
3124 {
3125         unsigned int strhashval;
3126         struct nfs4_client_reclaim *crp = NULL;
3127
3128         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3129         crp = alloc_reclaim();
3130         if (!crp)
3131                 return 0;
3132         strhashval = clientstr_hashval(name);
3133         INIT_LIST_HEAD(&crp->cr_strhash);
3134         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3135         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3136         reclaim_str_hashtbl_size++;
3137         return 1;
3138 }
3139
3140 static void
3141 nfs4_release_reclaim(void)
3142 {
3143         struct nfs4_client_reclaim *crp = NULL;
3144         int i;
3145
3146         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3147                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3148                         crp = list_entry(reclaim_str_hashtbl[i].next,
3149                                         struct nfs4_client_reclaim, cr_strhash);
3150                         list_del(&crp->cr_strhash);
3151                         kfree(crp);
3152                         reclaim_str_hashtbl_size--;
3153                 }
3154         }
3155         BUG_ON(reclaim_str_hashtbl_size);
3156 }
3157
3158 /*
3159  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3160 static struct nfs4_client_reclaim *
3161 nfs4_find_reclaim_client(clientid_t *clid)
3162 {
3163         unsigned int strhashval;
3164         struct nfs4_client *clp;
3165         struct nfs4_client_reclaim *crp = NULL;
3166
3167
3168         /* find clientid in conf_id_hashtbl */
3169         clp = find_confirmed_client(clid);
3170         if (clp == NULL)
3171                 return NULL;
3172
3173         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3174                             clp->cl_name.len, clp->cl_name.data,
3175                             clp->cl_recdir);
3176
3177         /* find clp->cl_name in reclaim_str_hashtbl */
3178         strhashval = clientstr_hashval(clp->cl_recdir);
3179         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3180                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3181                         return crp;
3182                 }
3183         }
3184         return NULL;
3185 }
3186
3187 /*
3188 * Called from OPEN. Look for clientid in reclaim list.
3189 */
3190 int
3191 nfs4_check_open_reclaim(clientid_t *clid)
3192 {
3193         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3194 }
3195
3196 /* initialization to perform at module load time: */
3197
3198 void
3199 nfs4_state_init(void)
3200 {
3201         int i;
3202
3203         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3204                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3205                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3206                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3207                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3208         }
3209         for (i = 0; i < FILE_HASH_SIZE; i++) {
3210                 INIT_LIST_HEAD(&file_hashtbl[i]);
3211         }
3212         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3213                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3214                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3215         }
3216         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3217                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3218                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3219         }
3220         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3221                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3222                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3223         }
3224         memset(&onestateid, ~0, sizeof(stateid_t));
3225         INIT_LIST_HEAD(&close_lru);
3226         INIT_LIST_HEAD(&client_lru);
3227         INIT_LIST_HEAD(&del_recall_lru);
3228         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3229                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3230         reclaim_str_hashtbl_size = 0;
3231 }
3232
3233 /* initialization to perform when the nfsd service is started: */
3234
3235 static void
3236 __nfs4_state_start(void)
3237 {
3238         time_t grace_time;
3239
3240         boot_time = get_seconds();
3241         grace_time = max(user_lease_time, lease_time);
3242         lease_time = user_lease_time;
3243         in_grace = 1;
3244         printk("NFSD: starting %ld-second grace period\n", grace_time);
3245         laundry_wq = create_singlethread_workqueue("nfsd4");
3246         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3247 }
3248
3249 int
3250 nfs4_state_start(void)
3251 {
3252         int status;
3253
3254         if (nfs4_init)
3255                 return 0;
3256         status = nfsd4_init_slabs();
3257         if (status)
3258                 return status;
3259         __nfs4_state_start();
3260         nfs4_init = 1;
3261         return 0;
3262 }
3263
3264 int
3265 nfs4_in_grace(void)
3266 {
3267         return in_grace;
3268 }
3269
3270 time_t
3271 nfs4_lease_time(void)
3272 {
3273         return lease_time;
3274 }
3275
3276 static void
3277 __nfs4_state_shutdown(void)
3278 {
3279         int i;
3280         struct nfs4_client *clp = NULL;
3281         struct nfs4_delegation *dp = NULL;
3282         struct nfs4_stateowner *sop = NULL;
3283         struct list_head *pos, *next, reaplist;
3284
3285         list_for_each_safe(pos, next, &close_lru) {
3286                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3287                 list_del(&sop->so_close_lru);
3288                 nfs4_put_stateowner(sop);
3289         }
3290
3291         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3292                 while (!list_empty(&conf_id_hashtbl[i])) {
3293                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3294                         expire_client(clp);
3295                 }
3296                 while (!list_empty(&unconf_str_hashtbl[i])) {
3297                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3298                         expire_client(clp);
3299                 }
3300         }
3301         INIT_LIST_HEAD(&reaplist);
3302         spin_lock(&recall_lock);
3303         list_for_each_safe(pos, next, &del_recall_lru) {
3304                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3305                 list_move(&dp->dl_recall_lru, &reaplist);
3306         }
3307         spin_unlock(&recall_lock);
3308         list_for_each_safe(pos, next, &reaplist) {
3309                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3310                 list_del_init(&dp->dl_recall_lru);
3311                 unhash_delegation(dp);
3312         }
3313
3314         cancel_delayed_work(&laundromat_work);
3315         flush_workqueue(laundry_wq);
3316         destroy_workqueue(laundry_wq);
3317         nfs4_init = 0;
3318 }
3319
3320 void
3321 nfs4_state_shutdown(void)
3322 {
3323         nfs4_lock_state();
3324         nfs4_release_reclaim();
3325         __nfs4_state_shutdown();
3326         nfsd4_free_slabs();
3327         nfs4_unlock_state();
3328 }
3329
3330 /*
3331  * Called when leasetime is changed.
3332  *
3333  * The only way the protocol gives us to handle on-the-fly lease changes is to
3334  * simulate a reboot.  Instead of doing that, we just wait till the next time
3335  * we start to register any changes in lease time.  If the administrator
3336  * really wants to change the lease time *now*, they can go ahead and bring
3337  * nfsd down and then back up again after changing the lease time.
3338  */
3339 void
3340 nfs4_reset_lease(time_t leasetime)
3341 {
3342         lock_kernel();
3343         user_lease_time = leasetime;
3344         unlock_kernel();
3345 }