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