fs/nfsd/nfs4state.c

   1 /*
   2 *  linux/fs/nfsd/nfs4state.c
   3 *
   4 *  Copyright (c) 2001 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson <kandros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 */
  36
  37 #include <linux/param.h>
  38 #include <linux/major.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/sunrpc/svc.h>
  42 #include <linux/nfsd/nfsd.h>
  43 #include <linux/nfsd/cache.h>
  44 #include <linux/file.h>
  45 #include <linux/mount.h>
  46 #include <linux/workqueue.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/kthread.h>
  49 #include <linux/nfs4.h>
  50 #include <linux/nfsd/state.h>
  51 #include <linux/nfsd/xdr4.h>
  52 #include <linux/namei.h>
  53 #include <linux/swap.h>
  54 #include <linux/mutex.h>
  55 #include <linux/lockd/bind.h>
  56 #include <linux/module.h>
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  59
  60 /* Globals */
  61 static time_t lease_time = 90;     /* default lease time */
  62 static time_t user_lease_time = 90;
  63 static time_t boot_time;
  64 static u32 current_ownerid = 1;
  65 static u32 current_fileid = 1;
  66 static u32 current_delegid = 1;
  67 static u32 nfs4_init;
  68 static stateid_t zerostateid;             /* bits all 0 */
  69 static stateid_t onestateid;              /* bits all 1 */
  70
  71 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
  72 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
  73
  74 /* forward declarations */
  75 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
  76 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
  77 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
  78 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
  79 static void nfs4_set_recdir(char *recdir);
  80
  81 /* Locking:
  82  *
  83  * client_mutex:
  84  *      protects clientid_hashtbl[], clientstr_hashtbl[],
  85  *      unconfstr_hashtbl[], uncofid_hashtbl[].
  86  */
  87 static DEFINE_MUTEX(client_mutex);
  88
  89 static struct kmem_cache *stateowner_slab = NULL;
  90 static struct kmem_cache *file_slab = NULL;
  91 static struct kmem_cache *stateid_slab = NULL;
  92 static struct kmem_cache *deleg_slab = NULL;
  93
  94 void
  95 nfs4_lock_state(void)
  96 {
  97         mutex_lock(&client_mutex);
  98 }
  99
 100 void
 101 nfs4_unlock_state(void)
 102 {
 103         mutex_unlock(&client_mutex);
 104 }
 105
 106 static inline u32
 107 opaque_hashval(const void *ptr, int nbytes)
 108 {
 109         unsigned char *cptr = (unsigned char *) ptr;
 110
 111         u32 x = 0;
 112         while (nbytes--) {
 113                 x *= 37;
 114                 x += *cptr++;
 115         }
 116         return x;
 117 }
 118
 119 /* forward declarations */
 120 static void release_stateowner(struct nfs4_stateowner *sop);
 121 static void release_stateid(struct nfs4_stateid *stp, int flags);
 122
 123 /*
 124  * Delegation state
 125  */
 126
 127 /* recall_lock protects the del_recall_lru */
 128 static DEFINE_SPINLOCK(recall_lock);
 129 static struct list_head del_recall_lru;
 130
 131 static void
 132 free_nfs4_file(struct kref *kref)
 133 {
 134         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
 135         list_del(&fp->fi_hash);
 136         iput(fp->fi_inode);
 137         kmem_cache_free(file_slab, fp);
 138 }
 139
 140 static inline void
 141 put_nfs4_file(struct nfs4_file *fi)
 142 {
 143         kref_put(&fi->fi_ref, free_nfs4_file);
 144 }
 145
 146 static inline void
 147 get_nfs4_file(struct nfs4_file *fi)
 148 {
 149         kref_get(&fi->fi_ref);
 150 }
 151
 152 static int num_delegations;
 153 unsigned int max_delegations;
 154
 155 /*
 156  * Open owner state (share locks)
 157  */
 158
 159 /* hash tables for nfs4_stateowner */
 160 #define OWNER_HASH_BITS              8
 161 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
 162 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
 163
 164 #define ownerid_hashval(id) \
 165         ((id) & OWNER_HASH_MASK)
 166 #define ownerstr_hashval(clientid, ownername) \
 167         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
 168
 169 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
 170 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
 171
 172 /* hash table for nfs4_file */
 173 #define FILE_HASH_BITS                   8
 174 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
 175 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
 176 /* hash table for (open)nfs4_stateid */
 177 #define STATEID_HASH_BITS              10
 178 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
 179 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
 180
 181 #define file_hashval(x) \
 182         hash_ptr(x, FILE_HASH_BITS)
 183 #define stateid_hashval(owner_id, file_id)  \
 184         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
 185
 186 static struct list_head file_hashtbl[FILE_HASH_SIZE];
 187 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
 188
 189 static struct nfs4_delegation *
 190 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
 191 {
 192         struct nfs4_delegation *dp;
 193         struct nfs4_file *fp = stp->st_file;
 194         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
 195
 196         dprintk("NFSD alloc_init_deleg\n");
 197         if (fp->fi_had_conflict)
 198                 return NULL;
 199         if (num_delegations > max_delegations)
 200                 return NULL;
 201         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
 202         if (dp == NULL)
 203                 return dp;
 204         num_delegations++;
 205         INIT_LIST_HEAD(&dp->dl_perfile);
 206         INIT_LIST_HEAD(&dp->dl_perclnt);
 207         INIT_LIST_HEAD(&dp->dl_recall_lru);
 208         dp->dl_client = clp;
 209         get_nfs4_file(fp);
 210         dp->dl_file = fp;
 211         dp->dl_flock = NULL;
 212         get_file(stp->st_vfs_file);
 213         dp->dl_vfs_file = stp->st_vfs_file;
 214         dp->dl_type = type;
 215         dp->dl_recall.cbr_dp = NULL;
 216         dp->dl_recall.cbr_ident = cb->cb_ident;
 217         dp->dl_recall.cbr_trunc = 0;
 218         dp->dl_stateid.si_boot = boot_time;
 219         dp->dl_stateid.si_stateownerid = current_delegid++;
 220         dp->dl_stateid.si_fileid = 0;
 221         dp->dl_stateid.si_generation = 0;
 222         dp->dl_fhlen = current_fh->fh_handle.fh_size;
 223         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
 224                         current_fh->fh_handle.fh_size);
 225         dp->dl_time = 0;
 226         atomic_set(&dp->dl_count, 1);
 227         list_add(&dp->dl_perfile, &fp->fi_delegations);
 228         list_add(&dp->dl_perclnt, &clp->cl_delegations);
 229         return dp;
 230 }
 231
 232 void
 233 nfs4_put_delegation(struct nfs4_delegation *dp)
 234 {
 235         if (atomic_dec_and_test(&dp->dl_count)) {
 236                 dprintk("NFSD: freeing dp %p\n",dp);
 237                 put_nfs4_file(dp->dl_file);
 238                 kmem_cache_free(deleg_slab, dp);
 239                 num_delegations--;
 240         }
 241 }
 242
 243 /* Remove the associated file_lock first, then remove the delegation.
 244  * lease_modify() is called to remove the FS_LEASE file_lock from
 245  * the i_flock list, eventually calling nfsd's lock_manager
 246  * fl_release_callback.
 247  */
 248 static void
 249 nfs4_close_delegation(struct nfs4_delegation *dp)
 250 {
 251         struct file *filp = dp->dl_vfs_file;
 252
 253         dprintk("NFSD: close_delegation dp %p\n",dp);
 254         dp->dl_vfs_file = NULL;
 255         /* The following nfsd_close may not actually close the file,
 256          * but we want to remove the lease in any case. */
 257         if (dp->dl_flock)
 258                 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
 259         nfsd_close(filp);
 260 }
 261
 262 /* Called under the state lock. */
 263 static void
 264 unhash_delegation(struct nfs4_delegation *dp)
 265 {
 266         list_del_init(&dp->dl_perfile);
 267         list_del_init(&dp->dl_perclnt);
 268         spin_lock(&recall_lock);
 269         list_del_init(&dp->dl_recall_lru);
 270         spin_unlock(&recall_lock);
 271         nfs4_close_delegation(dp);
 272         nfs4_put_delegation(dp);
 273 }
 274
 275 /*
 276  * SETCLIENTID state
 277  */
 278
 279 /* Hash tables for nfs4_clientid state */
 280 #define CLIENT_HASH_BITS                 4
 281 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 282 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 283
 284 #define clientid_hashval(id) \
 285         ((id) & CLIENT_HASH_MASK)
 286 #define clientstr_hashval(name) \
 287         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
 288 /*
 289  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
 290  * used in reboot/reset lease grace period processing
 291  *
 292  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
 293  * setclientid_confirmed info.
 294  *
 295  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
 296  * setclientid info.
 297  *
 298  * client_lru holds client queue ordered by nfs4_client.cl_time
 299  * for lease renewal.
 300  *
 301  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
 302  * for last close replay.
 303  */
 304 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
 305 static int reclaim_str_hashtbl_size = 0;
 306 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
 307 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
 308 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
 309 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 310 static struct list_head client_lru;
 311 static struct list_head close_lru;
 312
 313 static inline void
 314 renew_client(struct nfs4_client *clp)
 315 {
 316         /*
 317         * Move client to the end to the LRU list.
 318         */
 319         dprintk("renewing client (clientid %08x/%08x)\n",
 320                         clp->cl_clientid.cl_boot,
 321                         clp->cl_clientid.cl_id);
 322         list_move_tail(&clp->cl_lru, &client_lru);
 323         clp->cl_time = get_seconds();
 324 }
 325
 326 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 327 static int
 328 STALE_CLIENTID(clientid_t *clid)
 329 {
 330         if (clid->cl_boot == boot_time)
 331                 return 0;
 332         dprintk("NFSD stale clientid (%08x/%08x)\n",
 333                         clid->cl_boot, clid->cl_id);
 334         return 1;
 335 }
 336
 337 /*
 338  * XXX Should we use a slab cache ?
 339  * This type of memory management is somewhat inefficient, but we use it
 340  * anyway since SETCLIENTID is not a common operation.
 341  */
 342 static struct nfs4_client *alloc_client(struct xdr_netobj name)
 343 {
 344         struct nfs4_client *clp;
 345
 346         clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
 347         if (clp == NULL)
 348                 return NULL;
 349         clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
 350         if (clp->cl_name.data == NULL) {
 351                 kfree(clp);
 352                 return NULL;
 353         }
 354         memcpy(clp->cl_name.data, name.data, name.len);
 355         clp->cl_name.len = name.len;
 356         return clp;
 357 }
 358
 359 static void
 360 shutdown_callback_client(struct nfs4_client *clp)
 361 {
 362         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 363
 364         if (clnt) {
 365                 /*
 366                  * Callback threads take a reference on the client, so there
 367                  * should be no outstanding callbacks at this point.
 368                  */
 369                 clp->cl_callback.cb_client = NULL;
 370                 rpc_shutdown_client(clnt);
 371         }
 372 }
 373
 374 static inline void
 375 free_client(struct nfs4_client *clp)
 376 {
 377         shutdown_callback_client(clp);
 378         if (clp->cl_cred.cr_group_info)
 379                 put_group_info(clp->cl_cred.cr_group_info);
 380         kfree(clp->cl_name.data);
 381         kfree(clp);
 382 }
 383
 384 void
 385 put_nfs4_client(struct nfs4_client *clp)
 386 {
 387         if (atomic_dec_and_test(&clp->cl_count))
 388                 free_client(clp);
 389 }
 390
 391 static void
 392 expire_client(struct nfs4_client *clp)
 393 {
 394         struct nfs4_stateowner *sop;
 395         struct nfs4_delegation *dp;
 396         struct list_head reaplist;
 397
 398         dprintk("NFSD: expire_client cl_count %d\n",
 399                             atomic_read(&clp->cl_count));
 400
 401         INIT_LIST_HEAD(&reaplist);
 402         spin_lock(&recall_lock);
 403         while (!list_empty(&clp->cl_delegations)) {
 404                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
 405                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
 406                                 dp->dl_flock);
 407                 list_del_init(&dp->dl_perclnt);
 408                 list_move(&dp->dl_recall_lru, &reaplist);
 409         }
 410         spin_unlock(&recall_lock);
 411         while (!list_empty(&reaplist)) {
 412                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
 413                 list_del_init(&dp->dl_recall_lru);
 414                 unhash_delegation(dp);
 415         }
 416         list_del(&clp->cl_idhash);
 417         list_del(&clp->cl_strhash);
 418         list_del(&clp->cl_lru);
 419         while (!list_empty(&clp->cl_openowners)) {
 420                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
 421                 release_stateowner(sop);
 422         }
 423         put_nfs4_client(clp);
 424 }
 425
 426 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
 427 {
 428         struct nfs4_client *clp;
 429
 430         clp = alloc_client(name);
 431         if (clp == NULL)
 432                 return NULL;
 433         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 434         atomic_set(&clp->cl_count, 1);
 435         atomic_set(&clp->cl_callback.cb_set, 0);
 436         INIT_LIST_HEAD(&clp->cl_idhash);
 437         INIT_LIST_HEAD(&clp->cl_strhash);
 438         INIT_LIST_HEAD(&clp->cl_openowners);
 439         INIT_LIST_HEAD(&clp->cl_delegations);
 440         INIT_LIST_HEAD(&clp->cl_lru);
 441         return clp;
 442 }
 443
 444 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
 445 {
 446         memcpy(target->cl_verifier.data, source->data,
 447                         sizeof(target->cl_verifier.data));
 448 }
 449
 450 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
 451 {
 452         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
 453         target->cl_clientid.cl_id = source->cl_clientid.cl_id;
 454 }
 455
 456 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
 457 {
 458         target->cr_uid = source->cr_uid;
 459         target->cr_gid = source->cr_gid;
 460         target->cr_group_info = source->cr_group_info;
 461         get_group_info(target->cr_group_info);
 462 }
 463
 464 static int same_name(const char *n1, const char *n2)
 465 {
 466         return 0 == memcmp(n1, n2, HEXDIR_LEN);
 467 }
 468
 469 static int
 470 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
 471 {
 472         return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
 473 }
 474
 475 static int
 476 same_clid(clientid_t *cl1, clientid_t *cl2)
 477 {
 478         return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
 479 }
 480
 481 /* XXX what about NGROUP */
 482 static int
 483 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
 484 {
 485         return cr1->cr_uid == cr2->cr_uid;
 486 }
 487
 488 static void gen_clid(struct nfs4_client *clp)
 489 {
 490         static u32 current_clientid = 1;
 491
 492         clp->cl_clientid.cl_boot = boot_time;
 493         clp->cl_clientid.cl_id = current_clientid++;
 494 }
 495
 496 static void gen_confirm(struct nfs4_client *clp)
 497 {
 498         static u32 i;
 499         u32 *p;
 500
 501         p = (u32 *)clp->cl_confirm.data;
 502         *p++ = get_seconds();
 503         *p++ = i++;
 504 }
 505
 506 static int check_name(struct xdr_netobj name)
 507 {
 508         if (name.len == 0)
 509                 return 0;
 510         if (name.len > NFS4_OPAQUE_LIMIT) {
 511                 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
 512                 return 0;
 513         }
 514         return 1;
 515 }
 516
 517 static void
 518 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
 519 {
 520         unsigned int idhashval;
 521
 522         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
 523         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 524         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
 525         list_add_tail(&clp->cl_lru, &client_lru);
 526         clp->cl_time = get_seconds();
 527 }
 528
 529 static void
 530 move_to_confirmed(struct nfs4_client *clp)
 531 {
 532         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
 533         unsigned int strhashval;
 534
 535         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 536         list_del_init(&clp->cl_strhash);
 537         list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
 538         strhashval = clientstr_hashval(clp->cl_recdir);
 539         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
 540         renew_client(clp);
 541 }
 542
 543 static struct nfs4_client *
 544 find_confirmed_client(clientid_t *clid)
 545 {
 546         struct nfs4_client *clp;
 547         unsigned int idhashval = clientid_hashval(clid->cl_id);
 548
 549         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
 550                 if (same_clid(&clp->cl_clientid, clid))
 551                         return clp;
 552         }
 553         return NULL;
 554 }
 555
 556 static struct nfs4_client *
 557 find_unconfirmed_client(clientid_t *clid)
 558 {
 559         struct nfs4_client *clp;
 560         unsigned int idhashval = clientid_hashval(clid->cl_id);
 561
 562         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
 563                 if (same_clid(&clp->cl_clientid, clid))
 564                         return clp;
 565         }
 566         return NULL;
 567 }
 568
 569 static struct nfs4_client *
 570 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
 571 {
 572         struct nfs4_client *clp;
 573
 574         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
 575                 if (same_name(clp->cl_recdir, dname))
 576                         return clp;
 577         }
 578         return NULL;
 579 }
 580
 581 static struct nfs4_client *
 582 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
 583 {
 584         struct nfs4_client *clp;
 585
 586         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
 587                 if (same_name(clp->cl_recdir, dname))
 588                         return clp;
 589         }
 590         return NULL;
 591 }
 592
 593 /* a helper function for parse_callback */
 594 static int
 595 parse_octet(unsigned int *lenp, char **addrp)
 596 {
 597         unsigned int len = *lenp;
 598         char *p = *addrp;
 599         int n = -1;
 600         char c;
 601
 602         for (;;) {
 603                 if (!len)
 604                         break;
 605                 len--;
 606                 c = *p++;
 607                 if (c == '.')
 608                         break;
 609                 if ((c < '0') || (c > '9')) {
 610                         n = -1;
 611                         break;
 612                 }
 613                 if (n < 0)
 614                         n = 0;
 615                 n = (n * 10) + (c - '0');
 616                 if (n > 255) {
 617                         n = -1;
 618                         break;
 619                 }
 620         }
 621         *lenp = len;
 622         *addrp = p;
 623         return n;
 624 }
 625
 626 /* parse and set the setclientid ipv4 callback address */
 627 static int
 628 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
 629 {
 630         int temp = 0;
 631         u32 cbaddr = 0;
 632         u16 cbport = 0;
 633         u32 addrlen = addr_len;
 634         char *addr = addr_val;
 635         int i, shift;
 636
 637         /* ipaddress */
 638         shift = 24;
 639         for(i = 4; i > 0  ; i--) {
 640                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 641                         return 0;
 642                 }
 643                 cbaddr |= (temp << shift);
 644                 if (shift > 0)
 645                 shift -= 8;
 646         }
 647         *cbaddrp = cbaddr;
 648
 649         /* port */
 650         shift = 8;
 651         for(i = 2; i > 0  ; i--) {
 652                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
 653                         return 0;
 654                 }
 655                 cbport |= (temp << shift);
 656                 if (shift > 0)
 657                         shift -= 8;
 658         }
 659         *cbportp = cbport;
 660         return 1;
 661 }
 662
 663 static void
 664 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 665 {
 666         struct nfs4_callback *cb = &clp->cl_callback;
 667
 668         /* Currently, we only support tcp for the callback channel */
 669         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
 670                 goto out_err;
 671
 672         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
 673                          &cb->cb_addr, &cb->cb_port)))
 674                 goto out_err;
 675         cb->cb_prog = se->se_callback_prog;
 676         cb->cb_ident = se->se_callback_ident;
 677         return;
 678 out_err:
 679         dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
 680                 "will not receive delegations\n",
 681                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
 682
 683         return;
 684 }
 685
 686 __be32
 687 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 688                   struct nfsd4_setclientid *setclid)
 689 {
 690         struct sockaddr_in      *sin = svc_addr_in(rqstp);
 691         struct xdr_netobj       clname = {
 692                 .len = setclid->se_namelen,
 693                 .data = setclid->se_name,
 694         };
 695         nfs4_verifier           clverifier = setclid->se_verf;
 696         unsigned int            strhashval;
 697         struct nfs4_client      *conf, *unconf, *new;
 698         __be32                  status;
 699         char                    dname[HEXDIR_LEN];
 700
 701         if (!check_name(clname))
 702                 return nfserr_inval;
 703
 704         status = nfs4_make_rec_clidname(dname, &clname);
 705         if (status)
 706                 return status;
 707
 708         /*
 709          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 710          * We get here on a DRC miss.
 711          */
 712
 713         strhashval = clientstr_hashval(dname);
 714
 715         nfs4_lock_state();
 716         conf = find_confirmed_client_by_str(dname, strhashval);
 717         if (conf) {
 718                 /* RFC 3530 14.2.33 CASE 0: */
 719                 status = nfserr_clid_inuse;
 720                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
 721                                 || conf->cl_addr != sin->sin_addr.s_addr) {
 722                         dprintk("NFSD: setclientid: string in use by client"
 723                                 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
 724                         goto out;
 725                 }
 726         }
 727         /*
 728          * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
 729          * has a description of SETCLIENTID request processing consisting
 730          * of 5 bullet points, labeled as CASE0 - CASE4 below.
 731          */
 732         unconf = find_unconfirmed_client_by_str(dname, strhashval);
 733         status = nfserr_resource;
 734         if (!conf) {
 735                 /*
 736                  * RFC 3530 14.2.33 CASE 4:
 737                  * placed first, because it is the normal case
 738                  */
 739                 if (unconf)
 740                         expire_client(unconf);
 741                 new = create_client(clname, dname);
 742                 if (new == NULL)
 743                         goto out;
 744                 gen_clid(new);
 745         } else if (same_verf(&conf->cl_verifier, &clverifier)) {
 746                 /*
 747                  * RFC 3530 14.2.33 CASE 1:
 748                  * probable callback update
 749                  */
 750                 if (unconf) {
 751                         /* Note this is removing unconfirmed {*x***},
 752                          * which is stronger than RFC recommended {vxc**}.
 753                          * This has the advantage that there is at most
 754                          * one {*x***} in either list at any time.
 755                          */
 756                         expire_client(unconf);
 757                 }
 758                 new = create_client(clname, dname);
 759                 if (new == NULL)
 760                         goto out;
 761                 copy_clid(new, conf);
 762         } else if (!unconf) {
 763                 /*
 764                  * RFC 3530 14.2.33 CASE 2:
 765                  * probable client reboot; state will be removed if
 766                  * confirmed.
 767                  */
 768                 new = create_client(clname, dname);
 769                 if (new == NULL)
 770                         goto out;
 771                 gen_clid(new);
 772         } else {
 773                 /*
 774                  * RFC 3530 14.2.33 CASE 3:
 775                  * probable client reboot; state will be removed if
 776                  * confirmed.
 777                  */
 778                 expire_client(unconf);
 779                 new = create_client(clname, dname);
 780                 if (new == NULL)
 781                         goto out;
 782                 gen_clid(new);
 783         }
 784         copy_verf(new, &clverifier);
 785         new->cl_addr = sin->sin_addr.s_addr;
 786         copy_cred(&new->cl_cred, &rqstp->rq_cred);
 787         gen_confirm(new);
 788         gen_callback(new, setclid);
 789         add_to_unconfirmed(new, strhashval);
 790         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
 791         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
 792         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
 793         status = nfs_ok;
 794 out:
 795         nfs4_unlock_state();
 796         return status;
 797 }
 798
 799
 800 /*
 801  * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
 802  * a description of SETCLIENTID_CONFIRM request processing consisting of 4
 803  * bullets, labeled as CASE1 - CASE4 below.
 804  */
 805 __be32
 806 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 807                          struct nfsd4_compound_state *cstate,
 808                          struct nfsd4_setclientid_confirm *setclientid_confirm)
 809 {
 810         struct sockaddr_in *sin = svc_addr_in(rqstp);
 811         struct nfs4_client *conf, *unconf;
 812         nfs4_verifier confirm = setclientid_confirm->sc_confirm;
 813         clientid_t * clid = &setclientid_confirm->sc_clientid;
 814         __be32 status;
 815
 816         if (STALE_CLIENTID(clid))
 817                 return nfserr_stale_clientid;
 818         /*
 819          * XXX The Duplicate Request Cache (DRC) has been checked (??)
 820          * We get here on a DRC miss.
 821          */
 822
 823         nfs4_lock_state();
 824
 825         conf = find_confirmed_client(clid);
 826         unconf = find_unconfirmed_client(clid);
 827
 828         status = nfserr_clid_inuse;
 829         if (conf && conf->cl_addr != sin->sin_addr.s_addr)
 830                 goto out;
 831         if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
 832                 goto out;
 833
 834         /*
 835          * section 14.2.34 of RFC 3530 has a description of
 836          * SETCLIENTID_CONFIRM request processing consisting
 837          * of 4 bullet points, labeled as CASE1 - CASE4 below.
 838          */
 839         if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
 840                 /*
 841                  * RFC 3530 14.2.34 CASE 1:
 842                  * callback update
 843                  */
 844                 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
 845                         status = nfserr_clid_inuse;
 846                 else {
 847                         /* XXX: We just turn off callbacks until we can handle
 848                           * change request correctly. */
 849                         atomic_set(&conf->cl_callback.cb_set, 0);
 850                         gen_confirm(conf);
 851                         nfsd4_remove_clid_dir(unconf);
 852                         expire_client(unconf);
 853                         status = nfs_ok;
 854
 855                 }
 856         } else if (conf && !unconf) {
 857                 /*
 858                  * RFC 3530 14.2.34 CASE 2:
 859                  * probable retransmitted request; play it safe and
 860                  * do nothing.
 861                  */
 862                 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
 863                         status = nfserr_clid_inuse;
 864                 else
 865                         status = nfs_ok;
 866         } else if (!conf && unconf
 867                         && same_verf(&unconf->cl_confirm, &confirm)) {
 868                 /*
 869                  * RFC 3530 14.2.34 CASE 3:
 870                  * Normal case; new or rebooted client:
 871                  */
 872                 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 873                         status = nfserr_clid_inuse;
 874                 } else {
 875                         unsigned int hash =
 876                                 clientstr_hashval(unconf->cl_recdir);
 877                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
 878                                                                         hash);
 879                         if (conf) {
 880                                 nfsd4_remove_clid_dir(conf);
 881                                 expire_client(conf);
 882                         }
 883                         move_to_confirmed(unconf);
 884                         conf = unconf;
 885                         nfsd4_probe_callback(conf);
 886                         status = nfs_ok;
 887                 }
 888         } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
 889             && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
 890                                                                 &confirm)))) {
 891                 /*
 892                  * RFC 3530 14.2.34 CASE 4:
 893                  * Client probably hasn't noticed that we rebooted yet.
 894                  */
 895                 status = nfserr_stale_clientid;
 896         } else {
 897                 /* check that we have hit one of the cases...*/
 898                 status = nfserr_clid_inuse;
 899         }
 900 out:
 901         nfs4_unlock_state();
 902         return status;
 903 }
 904
 905 /* OPEN Share state helper functions */
 906 static inline struct nfs4_file *
 907 alloc_init_file(struct inode *ino)
 908 {
 909         struct nfs4_file *fp;
 910         unsigned int hashval = file_hashval(ino);
 911
 912         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
 913         if (fp) {
 914                 kref_init(&fp->fi_ref);
 915                 INIT_LIST_HEAD(&fp->fi_hash);
 916                 INIT_LIST_HEAD(&fp->fi_stateids);
 917                 INIT_LIST_HEAD(&fp->fi_delegations);
 918                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
 919                 fp->fi_inode = igrab(ino);
 920                 fp->fi_id = current_fileid++;
 921                 fp->fi_had_conflict = false;
 922                 return fp;
 923         }
 924         return NULL;
 925 }
 926
 927 static void
 928 nfsd4_free_slab(struct kmem_cache **slab)
 929 {
 930         if (*slab == NULL)
 931                 return;
 932         kmem_cache_destroy(*slab);
 933         *slab = NULL;
 934 }
 935
 936 void
 937 nfsd4_free_slabs(void)
 938 {
 939         nfsd4_free_slab(&stateowner_slab);
 940         nfsd4_free_slab(&file_slab);
 941         nfsd4_free_slab(&stateid_slab);
 942         nfsd4_free_slab(&deleg_slab);
 943 }
 944
 945 static int
 946 nfsd4_init_slabs(void)
 947 {
 948         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
 949                         sizeof(struct nfs4_stateowner), 0, 0, NULL);
 950         if (stateowner_slab == NULL)
 951                 goto out_nomem;
 952         file_slab = kmem_cache_create("nfsd4_files",
 953                         sizeof(struct nfs4_file), 0, 0, NULL);
 954         if (file_slab == NULL)
 955                 goto out_nomem;
 956         stateid_slab = kmem_cache_create("nfsd4_stateids",
 957                         sizeof(struct nfs4_stateid), 0, 0, NULL);
 958         if (stateid_slab == NULL)
 959                 goto out_nomem;
 960         deleg_slab = kmem_cache_create("nfsd4_delegations",
 961                         sizeof(struct nfs4_delegation), 0, 0, NULL);
 962         if (deleg_slab == NULL)
 963                 goto out_nomem;
 964         return 0;
 965 out_nomem:
 966         nfsd4_free_slabs();
 967         dprintk("nfsd4: out of memory while initializing nfsv4\n");
 968         return -ENOMEM;
 969 }
 970
 971 void
 972 nfs4_free_stateowner(struct kref *kref)
 973 {
 974         struct nfs4_stateowner *sop =
 975                 container_of(kref, struct nfs4_stateowner, so_ref);
 976         kfree(sop->so_owner.data);
 977         kmem_cache_free(stateowner_slab, sop);
 978 }
 979
 980 static inline struct nfs4_stateowner *
 981 alloc_stateowner(struct xdr_netobj *owner)
 982 {
 983         struct nfs4_stateowner *sop;
 984
 985         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
 986                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
 987                         memcpy(sop->so_owner.data, owner->data, owner->len);
 988                         sop->so_owner.len = owner->len;
 989                         kref_init(&sop->so_ref);
 990                         return sop;
 991                 }
 992                 kmem_cache_free(stateowner_slab, sop);
 993         }
 994         return NULL;
 995 }
 996
 997 static struct nfs4_stateowner *
 998 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
 999         struct nfs4_stateowner *sop;
1000         struct nfs4_replay *rp;
1001         unsigned int idhashval;
1002
1003         if (!(sop = alloc_stateowner(&open->op_owner)))
1004                 return NULL;
1005         idhashval = ownerid_hashval(current_ownerid);
1006         INIT_LIST_HEAD(&sop->so_idhash);
1007         INIT_LIST_HEAD(&sop->so_strhash);
1008         INIT_LIST_HEAD(&sop->so_perclient);
1009         INIT_LIST_HEAD(&sop->so_stateids);
1010         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1011         INIT_LIST_HEAD(&sop->so_close_lru);
1012         sop->so_time = 0;
1013         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1014         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1015         list_add(&sop->so_perclient, &clp->cl_openowners);
1016         sop->so_is_open_owner = 1;
1017         sop->so_id = current_ownerid++;
1018         sop->so_client = clp;
1019         sop->so_seqid = open->op_seqid;
1020         sop->so_confirmed = 0;
1021         rp = &sop->so_replay;
1022         rp->rp_status = nfserr_serverfault;
1023         rp->rp_buflen = 0;
1024         rp->rp_buf = rp->rp_ibuf;
1025         return sop;
1026 }
1027
1028 static void
1029 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1030 {
1031         struct nfs4_stateowner *lock_sop;
1032
1033         while (!list_empty(&open_stp->st_lockowners)) {
1034                 lock_sop = list_entry(open_stp->st_lockowners.next,
1035                                 struct nfs4_stateowner, so_perstateid);
1036                 /* list_del(&open_stp->st_lockowners);  */
1037                 BUG_ON(lock_sop->so_is_open_owner);
1038                 release_stateowner(lock_sop);
1039         }
1040 }
1041
1042 static void
1043 unhash_stateowner(struct nfs4_stateowner *sop)
1044 {
1045         struct nfs4_stateid *stp;
1046
1047         list_del(&sop->so_idhash);
1048         list_del(&sop->so_strhash);
1049         if (sop->so_is_open_owner)
1050                 list_del(&sop->so_perclient);
1051         list_del(&sop->so_perstateid);
1052         while (!list_empty(&sop->so_stateids)) {
1053                 stp = list_entry(sop->so_stateids.next,
1054                         struct nfs4_stateid, st_perstateowner);
1055                 if (sop->so_is_open_owner)
1056                         release_stateid(stp, OPEN_STATE);
1057                 else
1058                         release_stateid(stp, LOCK_STATE);
1059         }
1060 }
1061
1062 static void
1063 release_stateowner(struct nfs4_stateowner *sop)
1064 {
1065         unhash_stateowner(sop);
1066         list_del(&sop->so_close_lru);
1067         nfs4_put_stateowner(sop);
1068 }
1069
1070 static inline void
1071 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1072         struct nfs4_stateowner *sop = open->op_stateowner;
1073         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1074
1075         INIT_LIST_HEAD(&stp->st_hash);
1076         INIT_LIST_HEAD(&stp->st_perstateowner);
1077         INIT_LIST_HEAD(&stp->st_lockowners);
1078         INIT_LIST_HEAD(&stp->st_perfile);
1079         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1080         list_add(&stp->st_perstateowner, &sop->so_stateids);
1081         list_add(&stp->st_perfile, &fp->fi_stateids);
1082         stp->st_stateowner = sop;
1083         get_nfs4_file(fp);
1084         stp->st_file = fp;
1085         stp->st_stateid.si_boot = boot_time;
1086         stp->st_stateid.si_stateownerid = sop->so_id;
1087         stp->st_stateid.si_fileid = fp->fi_id;
1088         stp->st_stateid.si_generation = 0;
1089         stp->st_access_bmap = 0;
1090         stp->st_deny_bmap = 0;
1091         __set_bit(open->op_share_access, &stp->st_access_bmap);
1092         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1093         stp->st_openstp = NULL;
1094 }
1095
1096 static void
1097 release_stateid(struct nfs4_stateid *stp, int flags)
1098 {
1099         struct file *filp = stp->st_vfs_file;
1100
1101         list_del(&stp->st_hash);
1102         list_del(&stp->st_perfile);
1103         list_del(&stp->st_perstateowner);
1104         if (flags & OPEN_STATE) {
1105                 release_stateid_lockowners(stp);
1106                 stp->st_vfs_file = NULL;
1107                 nfsd_close(filp);
1108         } else if (flags & LOCK_STATE)
1109                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1110         put_nfs4_file(stp->st_file);
1111         kmem_cache_free(stateid_slab, stp);
1112 }
1113
1114 static void
1115 move_to_close_lru(struct nfs4_stateowner *sop)
1116 {
1117         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1118
1119         list_move_tail(&sop->so_close_lru, &close_lru);
1120         sop->so_time = get_seconds();
1121 }
1122
1123 static int
1124 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1125                                                         clientid_t *clid)
1126 {
1127         return (sop->so_owner.len == owner->len) &&
1128                 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1129                 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1130 }
1131
1132 static struct nfs4_stateowner *
1133 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1134 {
1135         struct nfs4_stateowner *so = NULL;
1136
1137         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1138                 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1139                         return so;
1140         }
1141         return NULL;
1142 }
1143
1144 /* search file_hashtbl[] for file */
1145 static struct nfs4_file *
1146 find_file(struct inode *ino)
1147 {
1148         unsigned int hashval = file_hashval(ino);
1149         struct nfs4_file *fp;
1150
1151         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1152                 if (fp->fi_inode == ino) {
1153                         get_nfs4_file(fp);
1154                         return fp;
1155                 }
1156         }
1157         return NULL;
1158 }
1159
1160 static inline int access_valid(u32 x)
1161 {
1162         if (x < NFS4_SHARE_ACCESS_READ)
1163                 return 0;
1164         if (x > NFS4_SHARE_ACCESS_BOTH)
1165                 return 0;
1166         return 1;
1167 }
1168
1169 static inline int deny_valid(u32 x)
1170 {
1171         /* Note: unlike access bits, deny bits may be zero. */
1172         return x <= NFS4_SHARE_DENY_BOTH;
1173 }
1174
1175 /*
1176  * We store the NONE, READ, WRITE, and BOTH bits separately in the
1177  * st_{access,deny}_bmap field of the stateid, in order to track not
1178  * only what share bits are currently in force, but also what
1179  * combinations of share bits previous opens have used.  This allows us
1180  * to enforce the recommendation of rfc 3530 14.2.19 that the server
1181  * return an error if the client attempt to downgrade to a combination
1182  * of share bits not explicable by closing some of its previous opens.
1183  *
1184  * XXX: This enforcement is actually incomplete, since we don't keep
1185  * track of access/deny bit combinations; so, e.g., we allow:
1186  *
1187  *      OPEN allow read, deny write
1188  *      OPEN allow both, deny none
1189  *      DOWNGRADE allow read, deny none
1190  *
1191  * which we should reject.
1192  */
1193 static void
1194 set_access(unsigned int *access, unsigned long bmap) {
1195         int i;
1196
1197         *access = 0;
1198         for (i = 1; i < 4; i++) {
1199                 if (test_bit(i, &bmap))
1200                         *access |= i;
1201         }
1202 }
1203
1204 static void
1205 set_deny(unsigned int *deny, unsigned long bmap) {
1206         int i;
1207
1208         *deny = 0;
1209         for (i = 0; i < 4; i++) {
1210                 if (test_bit(i, &bmap))
1211                         *deny |= i ;
1212         }
1213 }
1214
1215 static int
1216 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1217         unsigned int access, deny;
1218
1219         set_access(&access, stp->st_access_bmap);
1220         set_deny(&deny, stp->st_deny_bmap);
1221         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1222                 return 0;
1223         return 1;
1224 }
1225
1226 /*
1227  * Called to check deny when READ with all zero stateid or
1228  * WRITE with all zero or all one stateid
1229  */
1230 static __be32
1231 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1232 {
1233         struct inode *ino = current_fh->fh_dentry->d_inode;
1234         struct nfs4_file *fp;
1235         struct nfs4_stateid *stp;
1236         __be32 ret;
1237
1238         dprintk("NFSD: nfs4_share_conflict\n");
1239
1240         fp = find_file(ino);
1241         if (!fp)
1242                 return nfs_ok;
1243         ret = nfserr_locked;
1244         /* Search for conflicting share reservations */
1245         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1246                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1247                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1248                         goto out;
1249         }
1250         ret = nfs_ok;
1251 out:
1252         put_nfs4_file(fp);
1253         return ret;
1254 }
1255
1256 static inline void
1257 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1258 {
1259         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1260                 drop_file_write_access(filp);
1261                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1262         }
1263 }
1264
1265 /*
1266  * Recall a delegation
1267  */
1268 static int
1269 do_recall(void *__dp)
1270 {
1271         struct nfs4_delegation *dp = __dp;
1272
1273         dp->dl_file->fi_had_conflict = true;
1274         nfsd4_cb_recall(dp);
1275         return 0;
1276 }
1277
1278 /*
1279  * Spawn a thread to perform a recall on the delegation represented
1280  * by the lease (file_lock)
1281  *
1282  * Called from break_lease() with lock_kernel() held.
1283  * Note: we assume break_lease will only call this *once* for any given
1284  * lease.
1285  */
1286 static
1287 void nfsd_break_deleg_cb(struct file_lock *fl)
1288 {
1289         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1290         struct task_struct *t;
1291
1292         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1293         if (!dp)
1294                 return;
1295
1296         /* We're assuming the state code never drops its reference
1297          * without first removing the lease.  Since we're in this lease
1298          * callback (and since the lease code is serialized by the kernel
1299          * lock) we know the server hasn't removed the lease yet, we know
1300          * it's safe to take a reference: */
1301         atomic_inc(&dp->dl_count);
1302         atomic_inc(&dp->dl_client->cl_count);
1303
1304         spin_lock(&recall_lock);
1305         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1306         spin_unlock(&recall_lock);
1307
1308         /* only place dl_time is set. protected by lock_kernel*/
1309         dp->dl_time = get_seconds();
1310
1311         /*
1312          * We don't want the locks code to timeout the lease for us;
1313          * we'll remove it ourself if the delegation isn't returned
1314          * in time.
1315          */
1316         fl->fl_break_time = 0;
1317
1318         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1319         if (IS_ERR(t)) {
1320                 struct nfs4_client *clp = dp->dl_client;
1321
1322                 printk(KERN_INFO "NFSD: Callback thread failed for "
1323                         "for client (clientid %08x/%08x)\n",
1324                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1325                 put_nfs4_client(dp->dl_client);
1326                 nfs4_put_delegation(dp);
1327         }
1328 }
1329
1330 /*
1331  * The file_lock is being reapd.
1332  *
1333  * Called by locks_free_lock() with lock_kernel() held.
1334  */
1335 static
1336 void nfsd_release_deleg_cb(struct file_lock *fl)
1337 {
1338         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1339
1340         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1341
1342         if (!(fl->fl_flags & FL_LEASE) || !dp)
1343                 return;
1344         dp->dl_flock = NULL;
1345 }
1346
1347 /*
1348  * Set the delegation file_lock back pointer.
1349  *
1350  * Called from setlease() with lock_kernel() held.
1351  */
1352 static
1353 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1354 {
1355         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1356
1357         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1358         if (!dp)
1359                 return;
1360         dp->dl_flock = new;
1361 }
1362
1363 /*
1364  * Called from setlease() with lock_kernel() held
1365  */
1366 static
1367 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1368 {
1369         struct nfs4_delegation *onlistd =
1370                 (struct nfs4_delegation *)onlist->fl_owner;
1371         struct nfs4_delegation *tryd =
1372                 (struct nfs4_delegation *)try->fl_owner;
1373
1374         if (onlist->fl_lmops != try->fl_lmops)
1375                 return 0;
1376
1377         return onlistd->dl_client == tryd->dl_client;
1378 }
1379
1380
1381 static
1382 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1383 {
1384         if (arg & F_UNLCK)
1385                 return lease_modify(onlist, arg);
1386         else
1387                 return -EAGAIN;
1388 }
1389
1390 static struct lock_manager_operations nfsd_lease_mng_ops = {
1391         .fl_break = nfsd_break_deleg_cb,
1392         .fl_release_private = nfsd_release_deleg_cb,
1393         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1394         .fl_mylease = nfsd_same_client_deleg_cb,
1395         .fl_change = nfsd_change_deleg_cb,
1396 };
1397
1398
1399 __be32
1400 nfsd4_process_open1(struct nfsd4_open *open)
1401 {
1402         clientid_t *clientid = &open->op_clientid;
1403         struct nfs4_client *clp = NULL;
1404         unsigned int strhashval;
1405         struct nfs4_stateowner *sop = NULL;
1406
1407         if (!check_name(open->op_owner))
1408                 return nfserr_inval;
1409
1410         if (STALE_CLIENTID(&open->op_clientid))
1411                 return nfserr_stale_clientid;
1412
1413         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1414         sop = find_openstateowner_str(strhashval, open);
1415         open->op_stateowner = sop;
1416         if (!sop) {
1417                 /* Make sure the client's lease hasn't expired. */
1418                 clp = find_confirmed_client(clientid);
1419                 if (clp == NULL)
1420                         return nfserr_expired;
1421                 goto renew;
1422         }
1423         if (!sop->so_confirmed) {
1424                 /* Replace unconfirmed owners without checking for replay. */
1425                 clp = sop->so_client;
1426                 release_stateowner(sop);
1427                 open->op_stateowner = NULL;
1428                 goto renew;
1429         }
1430         if (open->op_seqid == sop->so_seqid - 1) {
1431                 if (sop->so_replay.rp_buflen)
1432                         return nfserr_replay_me;
1433                 /* The original OPEN failed so spectacularly
1434                  * that we don't even have replay data saved!
1435                  * Therefore, we have no choice but to continue
1436                  * processing this OPEN; presumably, we'll
1437                  * fail again for the same reason.
1438                  */
1439                 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1440                 goto renew;
1441         }
1442         if (open->op_seqid != sop->so_seqid)
1443                 return nfserr_bad_seqid;
1444 renew:
1445         if (open->op_stateowner == NULL) {
1446                 sop = alloc_init_open_stateowner(strhashval, clp, open);
1447                 if (sop == NULL)
1448                         return nfserr_resource;
1449                 open->op_stateowner = sop;
1450         }
1451         list_del_init(&sop->so_close_lru);
1452         renew_client(sop->so_client);
1453         return nfs_ok;
1454 }
1455
1456 static inline __be32
1457 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1458 {
1459         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1460                 return nfserr_openmode;
1461         else
1462                 return nfs_ok;
1463 }
1464
1465 static struct nfs4_delegation *
1466 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1467 {
1468         struct nfs4_delegation *dp;
1469
1470         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1471                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1472                         return dp;
1473         }
1474         return NULL;
1475 }
1476
1477 static __be32
1478 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1479                 struct nfs4_delegation **dp)
1480 {
1481         int flags;
1482         __be32 status = nfserr_bad_stateid;
1483
1484         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1485         if (*dp == NULL)
1486                 goto out;
1487         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1488                                                 RD_STATE : WR_STATE;
1489         status = nfs4_check_delegmode(*dp, flags);
1490         if (status)
1491                 *dp = NULL;
1492 out:
1493         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1494                 return nfs_ok;
1495         if (status)
1496                 return status;
1497         open->op_stateowner->so_confirmed = 1;
1498         return nfs_ok;
1499 }
1500
1501 static __be32
1502 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1503 {
1504         struct nfs4_stateid *local;
1505         __be32 status = nfserr_share_denied;
1506         struct nfs4_stateowner *sop = open->op_stateowner;
1507
1508         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1509                 /* ignore lock owners */
1510                 if (local->st_stateowner->so_is_open_owner == 0)
1511                         continue;
1512                 /* remember if we have seen this open owner */
1513                 if (local->st_stateowner == sop)
1514                         *stpp = local;
1515                 /* check for conflicting share reservations */
1516                 if (!test_share(local, open))
1517                         goto out;
1518         }
1519         status = 0;
1520 out:
1521         return status;
1522 }
1523
1524 static inline struct nfs4_stateid *
1525 nfs4_alloc_stateid(void)
1526 {
1527         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1528 }
1529
1530 static __be32
1531 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1532                 struct nfs4_delegation *dp,
1533                 struct svc_fh *cur_fh, int flags)
1534 {
1535         struct nfs4_stateid *stp;
1536
1537         stp = nfs4_alloc_stateid();
1538         if (stp == NULL)
1539                 return nfserr_resource;
1540
1541         if (dp) {
1542                 get_file(dp->dl_vfs_file);
1543                 stp->st_vfs_file = dp->dl_vfs_file;
1544         } else {
1545                 __be32 status;
1546                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1547                                 &stp->st_vfs_file);
1548                 if (status) {
1549                         if (status == nfserr_dropit)
1550                                 status = nfserr_jukebox;
1551                         kmem_cache_free(stateid_slab, stp);
1552                         return status;
1553                 }
1554         }
1555         *stpp = stp;
1556         return 0;
1557 }
1558
1559 static inline __be32
1560 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1561                 struct nfsd4_open *open)
1562 {
1563         struct iattr iattr = {
1564                 .ia_valid = ATTR_SIZE,
1565                 .ia_size = 0,
1566         };
1567         if (!open->op_truncate)
1568                 return 0;
1569         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1570                 return nfserr_inval;
1571         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1572 }
1573
1574 static __be32
1575 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1576 {
1577         struct file *filp = stp->st_vfs_file;
1578         struct inode *inode = filp->f_path.dentry->d_inode;
1579         unsigned int share_access, new_writer;
1580         __be32 status;
1581
1582         set_access(&share_access, stp->st_access_bmap);
1583         new_writer = (~share_access) & open->op_share_access
1584                         & NFS4_SHARE_ACCESS_WRITE;
1585
1586         if (new_writer) {
1587                 int err = get_write_access(inode);
1588                 if (err)
1589                         return nfserrno(err);
1590                 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1591                 if (err)
1592                         return nfserrno(err);
1593                 file_take_write(filp);
1594         }
1595         status = nfsd4_truncate(rqstp, cur_fh, open);
1596         if (status) {
1597                 if (new_writer)
1598                         put_write_access(inode);
1599                 return status;
1600         }
1601         /* remember the open */
1602         filp->f_mode |= open->op_share_access;
1603         __set_bit(open->op_share_access, &stp->st_access_bmap);
1604         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1605
1606         return nfs_ok;
1607 }
1608
1609
1610 static void
1611 nfs4_set_claim_prev(struct nfsd4_open *open)
1612 {
1613         open->op_stateowner->so_confirmed = 1;
1614         open->op_stateowner->so_client->cl_firststate = 1;
1615 }
1616
1617 /*
1618  * Attempt to hand out a delegation.
1619  */
1620 static void
1621 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1622 {
1623         struct nfs4_delegation *dp;
1624         struct nfs4_stateowner *sop = stp->st_stateowner;
1625         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1626         struct file_lock fl, *flp = &fl;
1627         int status, flag = 0;
1628
1629         flag = NFS4_OPEN_DELEGATE_NONE;
1630         open->op_recall = 0;
1631         switch (open->op_claim_type) {
1632                 case NFS4_OPEN_CLAIM_PREVIOUS:
1633                         if (!atomic_read(&cb->cb_set))
1634                                 open->op_recall = 1;
1635                         flag = open->op_delegate_type;
1636                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1637                                 goto out;
1638                         break;
1639                 case NFS4_OPEN_CLAIM_NULL:
1640                         /* Let's not give out any delegations till everyone's
1641                          * had the chance to reclaim theirs.... */
1642                         if (locks_in_grace())
1643                                 goto out;
1644                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1645                                 goto out;
1646                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1647                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1648                         else
1649                                 flag = NFS4_OPEN_DELEGATE_READ;
1650                         break;
1651                 default:
1652                         goto out;
1653         }
1654
1655         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1656         if (dp == NULL) {
1657                 flag = NFS4_OPEN_DELEGATE_NONE;
1658                 goto out;
1659         }
1660         locks_init_lock(&fl);
1661         fl.fl_lmops = &nfsd_lease_mng_ops;
1662         fl.fl_flags = FL_LEASE;
1663         fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1664         fl.fl_end = OFFSET_MAX;
1665         fl.fl_owner =  (fl_owner_t)dp;
1666         fl.fl_file = stp->st_vfs_file;
1667         fl.fl_pid = current->tgid;
1668
1669         /* vfs_setlease checks to see if delegation should be handed out.
1670          * the lock_manager callbacks fl_mylease and fl_change are used
1671          */
1672         if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1673                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1674                 unhash_delegation(dp);
1675                 flag = NFS4_OPEN_DELEGATE_NONE;
1676                 goto out;
1677         }
1678
1679         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1680
1681         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1682                      dp->dl_stateid.si_boot,
1683                      dp->dl_stateid.si_stateownerid,
1684                      dp->dl_stateid.si_fileid,
1685                      dp->dl_stateid.si_generation);
1686 out:
1687         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1688                         && flag == NFS4_OPEN_DELEGATE_NONE
1689                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1690                 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1691         open->op_delegate_type = flag;
1692 }
1693
1694 /*
1695  * called with nfs4_lock_state() held.
1696  */
1697 __be32
1698 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1699 {
1700         struct nfs4_file *fp = NULL;
1701         struct inode *ino = current_fh->fh_dentry->d_inode;
1702         struct nfs4_stateid *stp = NULL;
1703         struct nfs4_delegation *dp = NULL;
1704         __be32 status;
1705
1706         status = nfserr_inval;
1707         if (!access_valid(open->op_share_access)
1708                         || !deny_valid(open->op_share_deny))
1709                 goto out;
1710         /*
1711          * Lookup file; if found, lookup stateid and check open request,
1712          * and check for delegations in the process of being recalled.
1713          * If not found, create the nfs4_file struct
1714          */
1715         fp = find_file(ino);
1716         if (fp) {
1717                 if ((status = nfs4_check_open(fp, open, &stp)))
1718                         goto out;
1719                 status = nfs4_check_deleg(fp, open, &dp);
1720                 if (status)
1721                         goto out;
1722         } else {
1723                 status = nfserr_bad_stateid;
1724                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1725                         goto out;
1726                 status = nfserr_resource;
1727                 fp = alloc_init_file(ino);
1728                 if (fp == NULL)
1729                         goto out;
1730         }
1731
1732         /*
1733          * OPEN the file, or upgrade an existing OPEN.
1734          * If truncate fails, the OPEN fails.
1735          */
1736         if (stp) {
1737                 /* Stateid was found, this is an OPEN upgrade */
1738                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1739                 if (status)
1740                         goto out;
1741                 update_stateid(&stp->st_stateid);
1742         } else {
1743                 /* Stateid was not found, this is a new OPEN */
1744                 int flags = 0;
1745                 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1746                         flags |= NFSD_MAY_READ;
1747                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1748                         flags |= NFSD_MAY_WRITE;
1749                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1750                 if (status)
1751                         goto out;
1752                 init_stateid(stp, fp, open);
1753                 status = nfsd4_truncate(rqstp, current_fh, open);
1754                 if (status) {
1755                         release_stateid(stp, OPEN_STATE);
1756                         goto out;
1757                 }
1758         }
1759         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1760
1761         /*
1762         * Attempt to hand out a delegation. No error return, because the
1763         * OPEN succeeds even if we fail.
1764         */
1765         nfs4_open_delegation(current_fh, open, stp);
1766
1767         status = nfs_ok;
1768
1769         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1770                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1771                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1772 out:
1773         if (fp)
1774                 put_nfs4_file(fp);
1775         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1776                 nfs4_set_claim_prev(open);
1777         /*
1778         * To finish the open response, we just need to set the rflags.
1779         */
1780         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1781         if (!open->op_stateowner->so_confirmed)
1782                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1783
1784         return status;
1785 }
1786
1787 __be32
1788 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1789             clientid_t *clid)
1790 {
1791         struct nfs4_client *clp;
1792         __be32 status;
1793
1794         nfs4_lock_state();
1795         dprintk("process_renew(%08x/%08x): starting\n",
1796                         clid->cl_boot, clid->cl_id);
1797         status = nfserr_stale_clientid;
1798         if (STALE_CLIENTID(clid))
1799                 goto out;
1800         clp = find_confirmed_client(clid);
1801         status = nfserr_expired;
1802         if (clp == NULL) {
1803                 /* We assume the client took too long to RENEW. */
1804                 dprintk("nfsd4_renew: clientid not found!\n");
1805                 goto out;
1806         }
1807         renew_client(clp);
1808         status = nfserr_cb_path_down;
1809         if (!list_empty(&clp->cl_delegations)
1810                         && !atomic_read(&clp->cl_callback.cb_set))
1811                 goto out;
1812         status = nfs_ok;
1813 out:
1814         nfs4_unlock_state();
1815         return status;
1816 }
1817
1818 struct lock_manager nfsd4_manager = {
1819 };
1820
1821 static void
1822 nfsd4_end_grace(void)
1823 {
1824         dprintk("NFSD: end of grace period\n");
1825         nfsd4_recdir_purge_old();
1826         locks_end_grace(&nfsd4_manager);
1827 }
1828
1829 static time_t
1830 nfs4_laundromat(void)
1831 {
1832         struct nfs4_client *clp;
1833         struct nfs4_stateowner *sop;
1834         struct nfs4_delegation *dp;
1835         struct list_head *pos, *next, reaplist;
1836         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1837         time_t t, clientid_val = NFSD_LEASE_TIME;
1838         time_t u, test_val = NFSD_LEASE_TIME;
1839
1840         nfs4_lock_state();
1841
1842         dprintk("NFSD: laundromat service - starting\n");
1843         if (locks_in_grace())
1844                 nfsd4_end_grace();
1845         list_for_each_safe(pos, next, &client_lru) {
1846                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1847                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1848                         t = clp->cl_time - cutoff;
1849                         if (clientid_val > t)
1850                                 clientid_val = t;
1851                         break;
1852                 }
1853                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1854                         clp->cl_clientid.cl_id);
1855                 nfsd4_remove_clid_dir(clp);
1856                 expire_client(clp);
1857         }
1858         INIT_LIST_HEAD(&reaplist);
1859         spin_lock(&recall_lock);
1860         list_for_each_safe(pos, next, &del_recall_lru) {
1861                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1862                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1863                         u = dp->dl_time - cutoff;
1864                         if (test_val > u)
1865                                 test_val = u;
1866                         break;
1867                 }
1868                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1869                                     dp, dp->dl_flock);
1870                 list_move(&dp->dl_recall_lru, &reaplist);
1871         }
1872         spin_unlock(&recall_lock);
1873         list_for_each_safe(pos, next, &reaplist) {
1874                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1875                 list_del_init(&dp->dl_recall_lru);
1876                 unhash_delegation(dp);
1877         }
1878         test_val = NFSD_LEASE_TIME;
1879         list_for_each_safe(pos, next, &close_lru) {
1880                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1881                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1882                         u = sop->so_time - cutoff;
1883                         if (test_val > u)
1884                                 test_val = u;
1885                         break;
1886                 }
1887                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1888                         sop->so_id);
1889                 release_stateowner(sop);
1890         }
1891         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1892                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1893         nfs4_unlock_state();
1894         return clientid_val;
1895 }
1896
1897 static struct workqueue_struct *laundry_wq;
1898 static void laundromat_main(struct work_struct *);
1899 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1900
1901 static void
1902 laundromat_main(struct work_struct *not_used)
1903 {
1904         time_t t;
1905
1906         t = nfs4_laundromat();
1907         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1908         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1909 }
1910
1911 static struct nfs4_stateowner *
1912 search_close_lru(u32 st_id, int flags)
1913 {
1914         struct nfs4_stateowner *local = NULL;
1915
1916         if (flags & CLOSE_STATE) {
1917                 list_for_each_entry(local, &close_lru, so_close_lru) {
1918                         if (local->so_id == st_id)
1919                                 return local;
1920                 }
1921         }
1922         return NULL;
1923 }
1924
1925 static inline int
1926 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1927 {
1928         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1929 }
1930
1931 static int
1932 STALE_STATEID(stateid_t *stateid)
1933 {
1934         if (stateid->si_boot == boot_time)
1935                 return 0;
1936         dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1937                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1938                 stateid->si_generation);
1939         return 1;
1940 }
1941
1942 static inline int
1943 access_permit_read(unsigned long access_bmap)
1944 {
1945         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1946                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1947                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1948 }
1949
1950 static inline int
1951 access_permit_write(unsigned long access_bmap)
1952 {
1953         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1954                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1955 }
1956
1957 static
1958 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1959 {
1960         __be32 status = nfserr_openmode;
1961
1962         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1963                 goto out;
1964         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1965                 goto out;
1966         status = nfs_ok;
1967 out:
1968         return status;
1969 }
1970
1971 static inline __be32
1972 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1973 {
1974         /* Trying to call delegreturn with a special stateid? Yuch: */
1975         if (!(flags & (RD_STATE | WR_STATE)))
1976                 return nfserr_bad_stateid;
1977         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1978                 return nfs_ok;
1979         else if (locks_in_grace()) {
1980                 /* Answer in remaining cases depends on existance of
1981                  * conflicting state; so we must wait out the grace period. */
1982                 return nfserr_grace;
1983         } else if (flags & WR_STATE)
1984                 return nfs4_share_conflict(current_fh,
1985                                 NFS4_SHARE_DENY_WRITE);
1986         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1987                 return nfs4_share_conflict(current_fh,
1988                                 NFS4_SHARE_DENY_READ);
1989 }
1990
1991 /*
1992  * Allow READ/WRITE during grace period on recovered state only for files
1993  * that are not able to provide mandatory locking.
1994  */
1995 static inline int
1996 io_during_grace_disallowed(struct inode *inode, int flags)
1997 {
1998         return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
1999                 && mandatory_lock(inode);
2000 }
2001
2002 static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2003 {
2004         /* If the client sends us a stateid from the future, it's buggy: */
2005         if (in->si_generation > ref->si_generation)
2006                 return nfserr_bad_stateid;
2007         /*
2008          * The following, however, can happen.  For example, if the
2009          * client sends an open and some IO at the same time, the open
2010          * may bump si_generation while the IO is still in flight.
2011          * Thanks to hard links and renames, the client never knows what
2012          * file an open will affect.  So it could avoid that situation
2013          * only by serializing all opens and IO from the same open
2014          * owner.  To recover from the old_stateid error, the client
2015          * will just have to retry the IO:
2016          */
2017         if (in->si_generation < ref->si_generation)
2018                 return nfserr_old_stateid;
2019         return nfs_ok;
2020 }
2021
2022 /*
2023 * Checks for stateid operations
2024 */
2025 __be32
2026 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2027 {
2028         struct nfs4_stateid *stp = NULL;
2029         struct nfs4_delegation *dp = NULL;
2030         stateid_t *stidp;
2031         struct inode *ino = current_fh->fh_dentry->d_inode;
2032         __be32 status;
2033
2034         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2035                 stateid->si_boot, stateid->si_stateownerid,
2036                 stateid->si_fileid, stateid->si_generation);
2037         if (filpp)
2038                 *filpp = NULL;
2039
2040         if (io_during_grace_disallowed(ino, flags))
2041                 return nfserr_grace;
2042
2043         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2044                 return check_special_stateids(current_fh, stateid, flags);
2045
2046         /* STALE STATEID */
2047         status = nfserr_stale_stateid;
2048         if (STALE_STATEID(stateid))
2049                 goto out;
2050
2051         /* BAD STATEID */
2052         status = nfserr_bad_stateid;
2053         if (!stateid->si_fileid) { /* delegation stateid */
2054                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2055                         dprintk("NFSD: delegation stateid not found\n");
2056                         goto out;
2057                 }
2058                 stidp = &dp->dl_stateid;
2059         } else { /* open or lock stateid */
2060                 if (!(stp = find_stateid(stateid, flags))) {
2061                         dprintk("NFSD: open or lock stateid not found\n");
2062                         goto out;
2063                 }
2064                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2065                         goto out;
2066                 if (!stp->st_stateowner->so_confirmed)
2067                         goto out;
2068                 stidp = &stp->st_stateid;
2069         }
2070         status = check_stateid_generation(stateid, stidp);
2071         if (status)
2072                 goto out;
2073         if (stp) {
2074                 if ((status = nfs4_check_openmode(stp,flags)))
2075                         goto out;
2076                 renew_client(stp->st_stateowner->so_client);
2077                 if (filpp)
2078                         *filpp = stp->st_vfs_file;
2079         } else {
2080                 if ((status = nfs4_check_delegmode(dp, flags)))
2081                         goto out;
2082                 renew_client(dp->dl_client);
2083                 if (flags & DELEG_RET)
2084                         unhash_delegation(dp);
2085                 if (filpp)
2086                         *filpp = dp->dl_vfs_file;
2087         }
2088         status = nfs_ok;
2089 out:
2090         return status;
2091 }
2092
2093 static inline int
2094 setlkflg (int type)
2095 {
2096         return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2097                 RD_STATE : WR_STATE;
2098 }
2099
2100 /*
2101  * Checks for sequence id mutating operations.
2102  */
2103 static __be32
2104 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)
2105 {
2106         struct nfs4_stateid *stp;
2107         struct nfs4_stateowner *sop;
2108         __be32 status;
2109
2110         dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2111                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2112                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2113                 stateid->si_generation);
2114
2115         *stpp = NULL;
2116         *sopp = NULL;
2117
2118         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2119                 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2120                 return nfserr_bad_stateid;
2121         }
2122
2123         if (STALE_STATEID(stateid))
2124                 return nfserr_stale_stateid;
2125         /*
2126         * We return BAD_STATEID if filehandle doesn't match stateid,
2127         * the confirmed flag is incorrecly set, or the generation
2128         * number is incorrect.
2129         */
2130         stp = find_stateid(stateid, flags);
2131         if (stp == NULL) {
2132                 /*
2133                  * Also, we should make sure this isn't just the result of
2134                  * a replayed close:
2135                  */
2136                 sop = search_close_lru(stateid->si_stateownerid, flags);
2137                 if (sop == NULL)
2138                         return nfserr_bad_stateid;
2139                 *sopp = sop;
2140                 goto check_replay;
2141         }
2142
2143         *stpp = stp;
2144         *sopp = sop = stp->st_stateowner;
2145
2146         if (lock) {
2147                 clientid_t *lockclid = &lock->v.new.clientid;
2148                 struct nfs4_client *clp = sop->so_client;
2149                 int lkflg = 0;
2150                 __be32 status;
2151
2152                 lkflg = setlkflg(lock->lk_type);
2153
2154                 if (lock->lk_is_new) {
2155                         if (!sop->so_is_open_owner)
2156                                 return nfserr_bad_stateid;
2157                         if (!same_clid(&clp->cl_clientid, lockclid))
2158                                return nfserr_bad_stateid;
2159                         /* stp is the open stateid */
2160                         status = nfs4_check_openmode(stp, lkflg);
2161                         if (status)
2162                                 return status;
2163                 } else {
2164                         /* stp is the lock stateid */
2165                         status = nfs4_check_openmode(stp->st_openstp, lkflg);
2166                         if (status)
2167                                 return status;
2168                }
2169         }
2170
2171         if (nfs4_check_fh(current_fh, stp)) {
2172                 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2173                 return nfserr_bad_stateid;
2174         }
2175
2176         /*
2177         *  We now validate the seqid and stateid generation numbers.
2178         *  For the moment, we ignore the possibility of
2179         *  generation number wraparound.
2180         */
2181         if (seqid != sop->so_seqid)
2182                 goto check_replay;
2183
2184         if (sop->so_confirmed && flags & CONFIRM) {
2185                 dprintk("NFSD: preprocess_seqid_op: expected"
2186                                 " unconfirmed stateowner!\n");
2187                 return nfserr_bad_stateid;
2188         }
2189         if (!sop->so_confirmed && !(flags & CONFIRM)) {
2190                 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2191                                 " confirmed yet!\n");
2192                 return nfserr_bad_stateid;
2193         }
2194         status = check_stateid_generation(stateid, &stp->st_stateid);
2195         if (status)
2196                 return status;
2197         renew_client(sop->so_client);
2198         return nfs_ok;
2199
2200 check_replay:
2201         if (seqid == sop->so_seqid - 1) {
2202                 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2203                 /* indicate replay to calling function */
2204                 return nfserr_replay_me;
2205         }
2206         dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2207                         sop->so_seqid, seqid);
2208         *sopp = NULL;
2209         return nfserr_bad_seqid;
2210 }
2211
2212 __be32
2213 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2214                    struct nfsd4_open_confirm *oc)
2215 {
2216         __be32 status;
2217         struct nfs4_stateowner *sop;
2218         struct nfs4_stateid *stp;
2219
2220         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2221                         (int)cstate->current_fh.fh_dentry->d_name.len,
2222                         cstate->current_fh.fh_dentry->d_name.name);
2223
2224         status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2225         if (status)
2226                 return status;
2227
2228         nfs4_lock_state();
2229
2230         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2231                                         oc->oc_seqid, &oc->oc_req_stateid,
2232                                         CONFIRM | OPEN_STATE,
2233                                         &oc->oc_stateowner, &stp, NULL)))
2234                 goto out;
2235
2236         sop = oc->oc_stateowner;
2237         sop->so_confirmed = 1;
2238         update_stateid(&stp->st_stateid);
2239         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2240         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2241                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2242                          stp->st_stateid.si_boot,
2243                          stp->st_stateid.si_stateownerid,
2244                          stp->st_stateid.si_fileid,
2245                          stp->st_stateid.si_generation);
2246
2247         nfsd4_create_clid_dir(sop->so_client);
2248 out:
2249         if (oc->oc_stateowner) {
2250                 nfs4_get_stateowner(oc->oc_stateowner);
2251                 cstate->replay_owner = oc->oc_stateowner;
2252         }
2253         nfs4_unlock_state();
2254         return status;
2255 }
2256
2257
2258 /*
2259  * unset all bits in union bitmap (bmap) that
2260  * do not exist in share (from successful OPEN_DOWNGRADE)
2261  */
2262 static void
2263 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2264 {
2265         int i;
2266         for (i = 1; i < 4; i++) {
2267                 if ((i & access) != i)
2268                         __clear_bit(i, bmap);
2269         }
2270 }
2271
2272 static void
2273 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2274 {
2275         int i;
2276         for (i = 0; i < 4; i++) {
2277                 if ((i & deny) != i)
2278                         __clear_bit(i, bmap);
2279         }
2280 }
2281
2282 __be32
2283 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2284                      struct nfsd4_compound_state *cstate,
2285                      struct nfsd4_open_downgrade *od)
2286 {
2287         __be32 status;
2288         struct nfs4_stateid *stp;
2289         unsigned int share_access;
2290
2291         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2292                         (int)cstate->current_fh.fh_dentry->d_name.len,
2293                         cstate->current_fh.fh_dentry->d_name.name);
2294
2295         if (!access_valid(od->od_share_access)
2296                         || !deny_valid(od->od_share_deny))
2297                 return nfserr_inval;
2298
2299         nfs4_lock_state();
2300         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2301                                         od->od_seqid,
2302                                         &od->od_stateid,
2303                                         OPEN_STATE,
2304                                         &od->od_stateowner, &stp, NULL)))
2305                 goto out;
2306
2307         status = nfserr_inval;
2308         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2309                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2310                         stp->st_access_bmap, od->od_share_access);
2311                 goto out;
2312         }
2313         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2314                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2315                         stp->st_deny_bmap, od->od_share_deny);
2316                 goto out;
2317         }
2318         set_access(&share_access, stp->st_access_bmap);
2319         nfs4_file_downgrade(stp->st_vfs_file,
2320                             share_access & ~od->od_share_access);
2321
2322         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2323         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2324
2325         update_stateid(&stp->st_stateid);
2326         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2327         status = nfs_ok;
2328 out:
2329         if (od->od_stateowner) {
2330                 nfs4_get_stateowner(od->od_stateowner);
2331                 cstate->replay_owner = od->od_stateowner;
2332         }
2333         nfs4_unlock_state();
2334         return status;
2335 }
2336
2337 /*
2338  * nfs4_unlock_state() called after encode
2339  */
2340 __be32
2341 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2342             struct nfsd4_close *close)
2343 {
2344         __be32 status;
2345         struct nfs4_stateid *stp;
2346
2347         dprintk("NFSD: nfsd4_close on file %.*s\n",
2348                         (int)cstate->current_fh.fh_dentry->d_name.len,
2349                         cstate->current_fh.fh_dentry->d_name.name);
2350
2351         nfs4_lock_state();
2352         /* check close_lru for replay */
2353         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2354                                         close->cl_seqid,
2355                                         &close->cl_stateid,
2356                                         OPEN_STATE | CLOSE_STATE,
2357                                         &close->cl_stateowner, &stp, NULL)))
2358                 goto out;
2359         status = nfs_ok;
2360         update_stateid(&stp->st_stateid);
2361         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2362
2363         /* release_stateid() calls nfsd_close() if needed */
2364         release_stateid(stp, OPEN_STATE);
2365
2366         /* place unused nfs4_stateowners on so_close_lru list to be
2367          * released by the laundromat service after the lease period
2368          * to enable us to handle CLOSE replay
2369          */
2370         if (list_empty(&close->cl_stateowner->so_stateids))
2371                 move_to_close_lru(close->cl_stateowner);
2372 out:
2373         if (close->cl_stateowner) {
2374                 nfs4_get_stateowner(close->cl_stateowner);
2375                 cstate->replay_owner = close->cl_stateowner;
2376         }
2377         nfs4_unlock_state();
2378         return status;
2379 }
2380
2381 __be32
2382 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2383                   struct nfsd4_delegreturn *dr)
2384 {
2385         __be32 status;
2386
2387         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2388                 goto out;
2389
2390         nfs4_lock_state();
2391         status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2392                                             &dr->dr_stateid, DELEG_RET, NULL);
2393         nfs4_unlock_state();
2394 out:
2395         return status;
2396 }
2397
2398
2399 /*
2400  * Lock owner state (byte-range locks)
2401  */
2402 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2403 #define LOCK_HASH_BITS              8
2404 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2405 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2406
2407 #define lockownerid_hashval(id) \
2408         ((id) & LOCK_HASH_MASK)
2409
2410 static inline unsigned int
2411 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2412                 struct xdr_netobj *ownername)
2413 {
2414         return (file_hashval(inode) + cl_id
2415                         + opaque_hashval(ownername->data, ownername->len))
2416                 & LOCK_HASH_MASK;
2417 }
2418
2419 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2420 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2421 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2422
2423 static struct nfs4_stateid *
2424 find_stateid(stateid_t *stid, int flags)
2425 {
2426         struct nfs4_stateid *local = NULL;
2427         u32 st_id = stid->si_stateownerid;
2428         u32 f_id = stid->si_fileid;
2429         unsigned int hashval;
2430
2431         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2432         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2433                 hashval = stateid_hashval(st_id, f_id);
2434                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2435                         if ((local->st_stateid.si_stateownerid == st_id) &&
2436                             (local->st_stateid.si_fileid == f_id))
2437                                 return local;
2438                 }
2439         }
2440         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2441                 hashval = stateid_hashval(st_id, f_id);
2442                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2443                         if ((local->st_stateid.si_stateownerid == st_id) &&
2444                             (local->st_stateid.si_fileid == f_id))
2445                                 return local;
2446                 }
2447         }
2448         return NULL;
2449 }
2450
2451 static struct nfs4_delegation *
2452 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2453 {
2454         struct nfs4_file *fp;
2455         struct nfs4_delegation *dl;
2456
2457         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2458                     stid->si_boot, stid->si_stateownerid,
2459                     stid->si_fileid, stid->si_generation);
2460
2461         fp = find_file(ino);
2462         if (!fp)
2463                 return NULL;
2464         dl = find_delegation_file(fp, stid);
2465         put_nfs4_file(fp);
2466         return dl;
2467 }
2468
2469 /*
2470  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2471  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2472  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2473  * locking, this prevents us from being completely protocol-compliant.  The
2474  * real solution to this problem is to start using unsigned file offsets in
2475  * the VFS, but this is a very deep change!
2476  */
2477 static inline void
2478 nfs4_transform_lock_offset(struct file_lock *lock)
2479 {
2480         if (lock->fl_start < 0)
2481                 lock->fl_start = OFFSET_MAX;
2482         if (lock->fl_end < 0)
2483                 lock->fl_end = OFFSET_MAX;
2484 }
2485
2486 /* Hack!: For now, we're defining this just so we can use a pointer to it
2487  * as a unique cookie to identify our (NFSv4's) posix locks. */
2488 static struct lock_manager_operations nfsd_posix_mng_ops  = {
2489 };
2490
2491 static inline void
2492 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2493 {
2494         struct nfs4_stateowner *sop;
2495         unsigned int hval;
2496
2497         if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2498                 sop = (struct nfs4_stateowner *) fl->fl_owner;
2499                 hval = lockownerid_hashval(sop->so_id);
2500                 kref_get(&sop->so_ref);
2501                 deny->ld_sop = sop;
2502                 deny->ld_clientid = sop->so_client->cl_clientid;
2503         } else {
2504                 deny->ld_sop = NULL;
2505                 deny->ld_clientid.cl_boot = 0;
2506                 deny->ld_clientid.cl_id = 0;
2507         }
2508         deny->ld_start = fl->fl_start;
2509         deny->ld_length = ~(u64)0;
2510         if (fl->fl_end != ~(u64)0)
2511                 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2512         deny->ld_type = NFS4_READ_LT;
2513         if (fl->fl_type != F_RDLCK)
2514                 deny->ld_type = NFS4_WRITE_LT;
2515 }
2516
2517 static struct nfs4_stateowner *
2518 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2519                 struct xdr_netobj *owner)
2520 {
2521         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2522         struct nfs4_stateowner *op;
2523
2524         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2525                 if (same_owner_str(op, owner, clid))
2526                         return op;
2527         }
2528         return NULL;
2529 }
2530
2531 /*
2532  * Alloc a lock owner structure.
2533  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2534  * occured.
2535  *
2536  * strhashval = lock_ownerstr_hashval
2537  */
2538
2539 static struct nfs4_stateowner *
2540 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2541         struct nfs4_stateowner *sop;
2542         struct nfs4_replay *rp;
2543         unsigned int idhashval;
2544
2545         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2546                 return NULL;
2547         idhashval = lockownerid_hashval(current_ownerid);
2548         INIT_LIST_HEAD(&sop->so_idhash);
2549         INIT_LIST_HEAD(&sop->so_strhash);
2550         INIT_LIST_HEAD(&sop->so_perclient);
2551         INIT_LIST_HEAD(&sop->so_stateids);
2552         INIT_LIST_HEAD(&sop->so_perstateid);
2553         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2554         sop->so_time = 0;
2555         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2556         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2557         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2558         sop->so_is_open_owner = 0;
2559         sop->so_id = current_ownerid++;
2560         sop->so_client = clp;
2561         /* It is the openowner seqid that will be incremented in encode in the
2562          * case of new lockowners; so increment the lock seqid manually: */
2563         sop->so_seqid = lock->lk_new_lock_seqid + 1;
2564         sop->so_confirmed = 1;
2565         rp = &sop->so_replay;
2566         rp->rp_status = nfserr_serverfault;
2567         rp->rp_buflen = 0;
2568         rp->rp_buf = rp->rp_ibuf;
2569         return sop;
2570 }
2571
2572 static struct nfs4_stateid *
2573 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2574 {
2575         struct nfs4_stateid *stp;
2576         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2577
2578         stp = nfs4_alloc_stateid();
2579         if (stp == NULL)
2580                 goto out;
2581         INIT_LIST_HEAD(&stp->st_hash);
2582         INIT_LIST_HEAD(&stp->st_perfile);
2583         INIT_LIST_HEAD(&stp->st_perstateowner);
2584         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2585         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2586         list_add(&stp->st_perfile, &fp->fi_stateids);
2587         list_add(&stp->st_perstateowner, &sop->so_stateids);
2588         stp->st_stateowner = sop;
2589         get_nfs4_file(fp);
2590         stp->st_file = fp;
2591         stp->st_stateid.si_boot = boot_time;
2592         stp->st_stateid.si_stateownerid = sop->so_id;
2593         stp->st_stateid.si_fileid = fp->fi_id;
2594         stp->st_stateid.si_generation = 0;
2595         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2596         stp->st_access_bmap = open_stp->st_access_bmap;
2597         stp->st_deny_bmap = open_stp->st_deny_bmap;
2598         stp->st_openstp = open_stp;
2599
2600 out:
2601         return stp;
2602 }
2603
2604 static int
2605 check_lock_length(u64 offset, u64 length)
2606 {
2607         return ((length == 0)  || ((length != ~(u64)0) &&
2608              LOFF_OVERFLOW(offset, length)));
2609 }
2610
2611 /*
2612  *  LOCK operation
2613  */
2614 __be32
2615 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2616            struct nfsd4_lock *lock)
2617 {
2618         struct nfs4_stateowner *open_sop = NULL;
2619         struct nfs4_stateowner *lock_sop = NULL;
2620         struct nfs4_stateid *lock_stp;
2621         struct file *filp;
2622         struct file_lock file_lock;
2623         struct file_lock conflock;
2624         __be32 status = 0;
2625         unsigned int strhashval;
2626         unsigned int cmd;
2627         int err;
2628
2629         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2630                 (long long) lock->lk_offset,
2631                 (long long) lock->lk_length);
2632
2633         if (check_lock_length(lock->lk_offset, lock->lk_length))
2634                  return nfserr_inval;
2635
2636         if ((status = fh_verify(rqstp, &cstate->current_fh,
2637                                 S_IFREG, NFSD_MAY_LOCK))) {
2638                 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2639                 return status;
2640         }
2641
2642         nfs4_lock_state();
2643
2644         if (lock->lk_is_new) {
2645                 /*
2646                  * Client indicates that this is a new lockowner.
2647                  * Use open owner and open stateid to create lock owner and
2648                  * lock stateid.
2649                  */
2650                 struct nfs4_stateid *open_stp = NULL;
2651                 struct nfs4_file *fp;
2652
2653                 status = nfserr_stale_clientid;
2654                 if (STALE_CLIENTID(&lock->lk_new_clientid))
2655                         goto out;
2656
2657                 /* validate and update open stateid and open seqid */
2658                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2659                                         lock->lk_new_open_seqid,
2660                                         &lock->lk_new_open_stateid,
2661                                         OPEN_STATE,
2662                                         &lock->lk_replay_owner, &open_stp,
2663                                         lock);
2664                 if (status)
2665                         goto out;
2666                 open_sop = lock->lk_replay_owner;
2667                 /* create lockowner and lock stateid */
2668                 fp = open_stp->st_file;
2669                 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2670                                 open_sop->so_client->cl_clientid.cl_id,
2671                                 &lock->v.new.owner);
2672                 /* XXX: Do we need to check for duplicate stateowners on
2673                  * the same file, or should they just be allowed (and
2674                  * create new stateids)? */
2675                 status = nfserr_resource;
2676                 lock_sop = alloc_init_lock_stateowner(strhashval,
2677                                 open_sop->so_client, open_stp, lock);
2678                 if (lock_sop == NULL)
2679                         goto out;
2680                 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2681                 if (lock_stp == NULL)
2682                         goto out;
2683         } else {
2684                 /* lock (lock owner + lock stateid) already exists */
2685                 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2686                                        lock->lk_old_lock_seqid,
2687                                        &lock->lk_old_lock_stateid,
2688                                        LOCK_STATE,
2689                                        &lock->lk_replay_owner, &lock_stp, lock);
2690                 if (status)
2691                         goto out;
2692                 lock_sop = lock->lk_replay_owner;
2693         }
2694         /* lock->lk_replay_owner and lock_stp have been created or found */
2695         filp = lock_stp->st_vfs_file;
2696
2697         status = nfserr_grace;
2698         if (locks_in_grace() && !lock->lk_reclaim)
2699                 goto out;
2700         status = nfserr_no_grace;
2701         if (!locks_in_grace() && lock->lk_reclaim)
2702                 goto out;
2703
2704         locks_init_lock(&file_lock);
2705         switch (lock->lk_type) {
2706                 case NFS4_READ_LT:
2707                 case NFS4_READW_LT:
2708                         file_lock.fl_type = F_RDLCK;
2709                         cmd = F_SETLK;
2710                 break;
2711                 case NFS4_WRITE_LT:
2712                 case NFS4_WRITEW_LT:
2713                         file_lock.fl_type = F_WRLCK;
2714                         cmd = F_SETLK;
2715                 break;
2716                 default:
2717                         status = nfserr_inval;
2718                 goto out;
2719         }
2720         file_lock.fl_owner = (fl_owner_t)lock_sop;
2721         file_lock.fl_pid = current->tgid;
2722         file_lock.fl_file = filp;
2723         file_lock.fl_flags = FL_POSIX;
2724         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2725
2726         file_lock.fl_start = lock->lk_offset;
2727         if ((lock->lk_length == ~(u64)0) ||
2728                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2729                 file_lock.fl_end = ~(u64)0;
2730         else
2731                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2732         nfs4_transform_lock_offset(&file_lock);
2733
2734         /*
2735         * Try to lock the file in the VFS.
2736         * Note: locks.c uses the BKL to protect the inode's lock list.
2737         */
2738
2739         err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2740         switch (-err) {
2741         case 0: /* success! */
2742                 update_stateid(&lock_stp->st_stateid);
2743                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2744                                 sizeof(stateid_t));
2745                 status = 0;
2746                 break;
2747         case (EAGAIN):          /* conflock holds conflicting lock */
2748                 status = nfserr_denied;
2749                 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2750                 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2751                 break;
2752         case (EDEADLK):
2753                 status = nfserr_deadlock;
2754                 break;
2755         default:
2756                 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2757                 status = nfserr_resource;
2758                 break;
2759         }
2760 out:
2761         if (status && lock->lk_is_new && lock_sop)
2762                 release_stateowner(lock_sop);
2763         if (lock->lk_replay_owner) {
2764                 nfs4_get_stateowner(lock->lk_replay_owner);
2765                 cstate->replay_owner = lock->lk_replay_owner;
2766         }
2767         nfs4_unlock_state();
2768         return status;
2769 }
2770
2771 /*
2772  * LOCKT operation
2773  */
2774 __be32
2775 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2776             struct nfsd4_lockt *lockt)
2777 {
2778         struct inode *inode;
2779         struct file file;
2780         struct file_lock file_lock;
2781         int error;
2782         __be32 status;
2783
2784         if (locks_in_grace())
2785                 return nfserr_grace;
2786
2787         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2788                  return nfserr_inval;
2789
2790         lockt->lt_stateowner = NULL;
2791         nfs4_lock_state();
2792
2793         status = nfserr_stale_clientid;
2794         if (STALE_CLIENTID(&lockt->lt_clientid))
2795                 goto out;
2796
2797         if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2798                 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2799                 if (status == nfserr_symlink)
2800                         status = nfserr_inval;
2801                 goto out;
2802         }
2803
2804         inode = cstate->current_fh.fh_dentry->d_inode;
2805         locks_init_lock(&file_lock);
2806         switch (lockt->lt_type) {
2807                 case NFS4_READ_LT:
2808                 case NFS4_READW_LT:
2809                         file_lock.fl_type = F_RDLCK;
2810                 break;
2811                 case NFS4_WRITE_LT:
2812                 case NFS4_WRITEW_LT:
2813                         file_lock.fl_type = F_WRLCK;
2814                 break;
2815                 default:
2816                         dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2817                         status = nfserr_inval;
2818                 goto out;
2819         }
2820
2821         lockt->lt_stateowner = find_lockstateowner_str(inode,
2822                         &lockt->lt_clientid, &lockt->lt_owner);
2823         if (lockt->lt_stateowner)
2824                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2825         file_lock.fl_pid = current->tgid;
2826         file_lock.fl_flags = FL_POSIX;
2827         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2828
2829         file_lock.fl_start = lockt->lt_offset;
2830         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2831                 file_lock.fl_end = ~(u64)0;
2832         else
2833                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2834
2835         nfs4_transform_lock_offset(&file_lock);
2836
2837         /* vfs_test_lock uses the struct file _only_ to resolve the inode.
2838          * since LOCKT doesn't require an OPEN, and therefore a struct
2839          * file may not exist, pass vfs_test_lock a struct file with
2840          * only the dentry:inode set.
2841          */
2842         memset(&file, 0, sizeof (struct file));
2843         file.f_path.dentry = cstate->current_fh.fh_dentry;
2844
2845         status = nfs_ok;
2846         error = vfs_test_lock(&file, &file_lock);
2847         if (error) {
2848                 status = nfserrno(error);
2849                 goto out;
2850         }
2851         if (file_lock.fl_type != F_UNLCK) {
2852                 status = nfserr_denied;
2853                 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2854         }
2855 out:
2856         nfs4_unlock_state();
2857         return status;
2858 }
2859
2860 __be32
2861 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2862             struct nfsd4_locku *locku)
2863 {
2864         struct nfs4_stateid *stp;
2865         struct file *filp = NULL;
2866         struct file_lock file_lock;
2867         __be32 status;
2868         int err;
2869
2870         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2871                 (long long) locku->lu_offset,
2872                 (long long) locku->lu_length);
2873
2874         if (check_lock_length(locku->lu_offset, locku->lu_length))
2875                  return nfserr_inval;
2876
2877         nfs4_lock_state();
2878
2879         if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2880                                         locku->lu_seqid,
2881                                         &locku->lu_stateid,
2882                                         LOCK_STATE,
2883                                         &locku->lu_stateowner, &stp, NULL)))
2884                 goto out;
2885
2886         filp = stp->st_vfs_file;
2887         BUG_ON(!filp);
2888         locks_init_lock(&file_lock);
2889         file_lock.fl_type = F_UNLCK;
2890         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2891         file_lock.fl_pid = current->tgid;
2892         file_lock.fl_file = filp;
2893         file_lock.fl_flags = FL_POSIX;
2894         file_lock.fl_lmops = &nfsd_posix_mng_ops;
2895         file_lock.fl_start = locku->lu_offset;
2896
2897         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2898                 file_lock.fl_end = ~(u64)0;
2899         else
2900                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2901         nfs4_transform_lock_offset(&file_lock);
2902
2903         /*
2904         *  Try to unlock the file in the VFS.
2905         */
2906         err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2907         if (err) {
2908                 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2909                 goto out_nfserr;
2910         }
2911         /*
2912         * OK, unlock succeeded; the only thing left to do is update the stateid.
2913         */
2914         update_stateid(&stp->st_stateid);
2915         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2916
2917 out:
2918         if (locku->lu_stateowner) {
2919                 nfs4_get_stateowner(locku->lu_stateowner);
2920                 cstate->replay_owner = locku->lu_stateowner;
2921         }
2922         nfs4_unlock_state();
2923         return status;
2924
2925 out_nfserr:
2926         status = nfserrno(err);
2927         goto out;
2928 }
2929
2930 /*
2931  * returns
2932  *      1: locks held by lockowner
2933  *      0: no locks held by lockowner
2934  */
2935 static int
2936 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2937 {
2938         struct file_lock **flpp;
2939         struct inode *inode = filp->f_path.dentry->d_inode;
2940         int status = 0;
2941
2942         lock_kernel();
2943         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2944                 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2945                         status = 1;
2946                         goto out;
2947                 }
2948         }
2949 out:
2950         unlock_kernel();
2951         return status;
2952 }
2953
2954 __be32
2955 nfsd4_release_lockowner(struct svc_rqst *rqstp,
2956                         struct nfsd4_compound_state *cstate,
2957                         struct nfsd4_release_lockowner *rlockowner)
2958 {
2959         clientid_t *clid = &rlockowner->rl_clientid;
2960         struct nfs4_stateowner *sop;
2961         struct nfs4_stateid *stp;
2962         struct xdr_netobj *owner = &rlockowner->rl_owner;
2963         struct list_head matches;
2964         int i;
2965         __be32 status;
2966
2967         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2968                 clid->cl_boot, clid->cl_id);
2969
2970         /* XXX check for lease expiration */
2971
2972         status = nfserr_stale_clientid;
2973         if (STALE_CLIENTID(clid))
2974                 return status;
2975
2976         nfs4_lock_state();
2977
2978         status = nfserr_locks_held;
2979         /* XXX: we're doing a linear search through all the lockowners.
2980          * Yipes!  For now we'll just hope clients aren't really using
2981          * release_lockowner much, but eventually we have to fix these
2982          * data structures. */
2983         INIT_LIST_HEAD(&matches);
2984         for (i = 0; i < LOCK_HASH_SIZE; i++) {
2985                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
2986                         if (!same_owner_str(sop, owner, clid))
2987                                 continue;
2988                         list_for_each_entry(stp, &sop->so_stateids,
2989                                         st_perstateowner) {
2990                                 if (check_for_locks(stp->st_vfs_file, sop))
2991                                         goto out;
2992                                 /* Note: so_perclient unused for lockowners,
2993                                  * so it's OK to fool with here. */
2994                                 list_add(&sop->so_perclient, &matches);
2995                         }
2996                 }
2997         }
2998         /* Clients probably won't expect us to return with some (but not all)
2999          * of the lockowner state released; so don't release any until all
3000          * have been checked. */
3001         status = nfs_ok;
3002         while (!list_empty(&matches)) {
3003                 sop = list_entry(matches.next, struct nfs4_stateowner,
3004                                                                 so_perclient);
3005                 /* unhash_stateowner deletes so_perclient only
3006                  * for openowners. */
3007                 list_del(&sop->so_perclient);
3008                 release_stateowner(sop);
3009         }
3010 out:
3011         nfs4_unlock_state();
3012         return status;
3013 }
3014
3015 static inline struct nfs4_client_reclaim *
3016 alloc_reclaim(void)
3017 {
3018         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3019 }
3020
3021 int
3022 nfs4_has_reclaimed_state(const char *name)
3023 {
3024         unsigned int strhashval = clientstr_hashval(name);
3025         struct nfs4_client *clp;
3026
3027         clp = find_confirmed_client_by_str(name, strhashval);
3028         return clp ? 1 : 0;
3029 }
3030
3031 /*
3032  * failure => all reset bets are off, nfserr_no_grace...
3033  */
3034 int
3035 nfs4_client_to_reclaim(const char *name)
3036 {
3037         unsigned int strhashval;
3038         struct nfs4_client_reclaim *crp = NULL;
3039
3040         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3041         crp = alloc_reclaim();
3042         if (!crp)
3043                 return 0;
3044         strhashval = clientstr_hashval(name);
3045         INIT_LIST_HEAD(&crp->cr_strhash);
3046         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3047         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3048         reclaim_str_hashtbl_size++;
3049         return 1;
3050 }
3051
3052 static void
3053 nfs4_release_reclaim(void)
3054 {
3055         struct nfs4_client_reclaim *crp = NULL;
3056         int i;
3057
3058         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3059                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3060                         crp = list_entry(reclaim_str_hashtbl[i].next,
3061                                         struct nfs4_client_reclaim, cr_strhash);
3062                         list_del(&crp->cr_strhash);
3063                         kfree(crp);
3064                         reclaim_str_hashtbl_size--;
3065                 }
3066         }
3067         BUG_ON(reclaim_str_hashtbl_size);
3068 }
3069
3070 /*
3071  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3072 static struct nfs4_client_reclaim *
3073 nfs4_find_reclaim_client(clientid_t *clid)
3074 {
3075         unsigned int strhashval;
3076         struct nfs4_client *clp;
3077         struct nfs4_client_reclaim *crp = NULL;
3078
3079
3080         /* find clientid in conf_id_hashtbl */
3081         clp = find_confirmed_client(clid);
3082         if (clp == NULL)
3083                 return NULL;
3084
3085         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3086                             clp->cl_name.len, clp->cl_name.data,
3087                             clp->cl_recdir);
3088
3089         /* find clp->cl_name in reclaim_str_hashtbl */
3090         strhashval = clientstr_hashval(clp->cl_recdir);
3091         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3092                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3093                         return crp;
3094                 }
3095         }
3096         return NULL;
3097 }
3098
3099 /*
3100 * Called from OPEN. Look for clientid in reclaim list.
3101 */
3102 __be32
3103 nfs4_check_open_reclaim(clientid_t *clid)
3104 {
3105         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3106 }
3107
3108 /* initialization to perform at module load time: */
3109
3110 int
3111 nfs4_state_init(void)
3112 {
3113         int i, status;
3114
3115         status = nfsd4_init_slabs();
3116         if (status)
3117                 return status;
3118         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3119                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3120                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3121                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3122                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3123         }
3124         for (i = 0; i < FILE_HASH_SIZE; i++) {
3125                 INIT_LIST_HEAD(&file_hashtbl[i]);
3126         }
3127         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3128                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3129                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3130         }
3131         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3132                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3133                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3134         }
3135         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3136                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3137                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3138         }
3139         memset(&onestateid, ~0, sizeof(stateid_t));
3140         INIT_LIST_HEAD(&close_lru);
3141         INIT_LIST_HEAD(&client_lru);
3142         INIT_LIST_HEAD(&del_recall_lru);
3143         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3144                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3145         reclaim_str_hashtbl_size = 0;
3146         return 0;
3147 }
3148
3149 static void
3150 nfsd4_load_reboot_recovery_data(void)
3151 {
3152         int status;
3153
3154         nfs4_lock_state();
3155         nfsd4_init_recdir(user_recovery_dirname);
3156         status = nfsd4_recdir_load();
3157         nfs4_unlock_state();
3158         if (status)
3159                 printk("NFSD: Failure reading reboot recovery data\n");
3160 }
3161
3162 unsigned long
3163 get_nfs4_grace_period(void)
3164 {
3165         return max(user_lease_time, lease_time) * HZ;
3166 }
3167
3168 /*
3169  * Since the lifetime of a delegation isn't limited to that of an open, a
3170  * client may quite reasonably hang on to a delegation as long as it has
3171  * the inode cached.  This becomes an obvious problem the first time a
3172  * client's inode cache approaches the size of the server's total memory.
3173  *
3174  * For now we avoid this problem by imposing a hard limit on the number
3175  * of delegations, which varies according to the server's memory size.
3176  */
3177 static void
3178 set_max_delegations(void)
3179 {
3180         /*
3181          * Allow at most 4 delegations per megabyte of RAM.  Quick
3182          * estimates suggest that in the worst case (where every delegation
3183          * is for a different inode), a delegation could take about 1.5K,
3184          * giving a worst case usage of about 6% of memory.
3185          */
3186         max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3187 }
3188
3189 /* initialization to perform when the nfsd service is started: */
3190
3191 static void
3192 __nfs4_state_start(void)
3193 {
3194         unsigned long grace_time;
3195
3196         boot_time = get_seconds();
3197         grace_time = get_nfs4_grace_period();
3198         lease_time = user_lease_time;
3199         locks_start_grace(&nfsd4_manager);
3200         printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3201                grace_time/HZ);
3202         laundry_wq = create_singlethread_workqueue("nfsd4");
3203         queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3204         set_max_delegations();
3205 }
3206
3207 void
3208 nfs4_state_start(void)
3209 {
3210         if (nfs4_init)
3211                 return;
3212         nfsd4_load_reboot_recovery_data();
3213         __nfs4_state_start();
3214         nfs4_init = 1;
3215         return;
3216 }
3217
3218 time_t
3219 nfs4_lease_time(void)
3220 {
3221         return lease_time;
3222 }
3223
3224 static void
3225 __nfs4_state_shutdown(void)
3226 {
3227         int i;
3228         struct nfs4_client *clp = NULL;
3229         struct nfs4_delegation *dp = NULL;
3230         struct list_head *pos, *next, reaplist;
3231
3232         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3233                 while (!list_empty(&conf_id_hashtbl[i])) {
3234                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3235                         expire_client(clp);
3236                 }
3237                 while (!list_empty(&unconf_str_hashtbl[i])) {
3238                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3239                         expire_client(clp);
3240                 }
3241         }
3242         INIT_LIST_HEAD(&reaplist);
3243         spin_lock(&recall_lock);
3244         list_for_each_safe(pos, next, &del_recall_lru) {
3245                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3246                 list_move(&dp->dl_recall_lru, &reaplist);
3247         }
3248         spin_unlock(&recall_lock);
3249         list_for_each_safe(pos, next, &reaplist) {
3250                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3251                 list_del_init(&dp->dl_recall_lru);
3252                 unhash_delegation(dp);
3253         }
3254
3255         nfsd4_shutdown_recdir();
3256         nfs4_init = 0;
3257 }
3258
3259 void
3260 nfs4_state_shutdown(void)
3261 {
3262         cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3263         destroy_workqueue(laundry_wq);
3264         locks_end_grace(&nfsd4_manager);
3265         nfs4_lock_state();
3266         nfs4_release_reclaim();
3267         __nfs4_state_shutdown();
3268         nfs4_unlock_state();
3269 }
3270
3271 /*
3272  * user_recovery_dirname is protected by the nfsd_mutex since it's only
3273  * accessed when nfsd is starting.
3274  */
3275 static void
3276 nfs4_set_recdir(char *recdir)
3277 {
3278         strcpy(user_recovery_dirname, recdir);
3279 }
3280
3281 /*
3282  * Change the NFSv4 recovery directory to recdir.
3283  */
3284 int
3285 nfs4_reset_recoverydir(char *recdir)
3286 {
3287         int status;
3288         struct path path;
3289
3290         status = kern_path(recdir, LOOKUP_FOLLOW, &path);
3291         if (status)
3292                 return status;
3293         status = -ENOTDIR;
3294         if (S_ISDIR(path.dentry->d_inode->i_mode)) {
3295                 nfs4_set_recdir(recdir);
3296                 status = 0;
3297         }
3298         path_put(&path);
3299         return status;
3300 }
3301
3302 char *
3303 nfs4_recoverydir(void)
3304 {
3305         return user_recovery_dirname;
3306 }
3307
3308 /*
3309  * Called when leasetime is changed.
3310  *
3311  * The only way the protocol gives us to handle on-the-fly lease changes is to
3312  * simulate a reboot.  Instead of doing that, we just wait till the next time
3313  * we start to register any changes in lease time.  If the administrator
3314  * really wants to change the lease time *now*, they can go ahead and bring
3315  * nfsd down and then back up again after changing the lease time.
3316  *
3317  * user_lease_time is protected by nfsd_mutex since it's only really accessed
3318  * when nfsd is starting
3319  */
3320 void
3321 nfs4_reset_lease(time_t leasetime)
3322 {
3323         user_lease_time = leasetime;
3324 }