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 #include <linux/sunrpc/svcauth_gss.h> 58 59 #define NFSDDBG_FACILITY NFSDDBG_PROC 60 61 /* Globals */ 62 static time_t lease_time = 90; /* default lease time */ 63 static time_t user_lease_time = 90; 64 static time_t boot_time; 65 static u32 current_ownerid = 1; 66 static u32 current_fileid = 1; 67 static u32 current_delegid = 1; 68 static u32 nfs4_init; 69 static stateid_t zerostateid; /* bits all 0 */ 70 static stateid_t onestateid; /* bits all 1 */ 71 72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t))) 73 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t))) 74 75 /* forward declarations */ 76 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); 77 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); 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 /* Currently used for almost all code touching nfsv4 state: */ 84 static DEFINE_MUTEX(client_mutex); 85 86 /* 87 * Currently used for the del_recall_lru and file hash table. In an 88 * effort to decrease the scope of the client_mutex, this spinlock may 89 * eventually cover more: 90 */ 91 static DEFINE_SPINLOCK(recall_lock); 92 93 static struct kmem_cache *stateowner_slab = NULL; 94 static struct kmem_cache *file_slab = NULL; 95 static struct kmem_cache *stateid_slab = NULL; 96 static struct kmem_cache *deleg_slab = NULL; 97 98 void 99 nfs4_lock_state(void) 100 { 101 mutex_lock(&client_mutex); 102 } 103 104 void 105 nfs4_unlock_state(void) 106 { 107 mutex_unlock(&client_mutex); 108 } 109 110 static inline u32 111 opaque_hashval(const void *ptr, int nbytes) 112 { 113 unsigned char *cptr = (unsigned char *) ptr; 114 115 u32 x = 0; 116 while (nbytes--) { 117 x *= 37; 118 x += *cptr++; 119 } 120 return x; 121 } 122 123 static struct list_head del_recall_lru; 124 125 static inline void 126 put_nfs4_file(struct nfs4_file *fi) 127 { 128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { 129 list_del(&fi->fi_hash); 130 spin_unlock(&recall_lock); 131 iput(fi->fi_inode); 132 kmem_cache_free(file_slab, fi); 133 } 134 } 135 136 static inline void 137 get_nfs4_file(struct nfs4_file *fi) 138 { 139 atomic_inc(&fi->fi_ref); 140 } 141 142 static int num_delegations; 143 unsigned int max_delegations; 144 145 /* 146 * Open owner state (share locks) 147 */ 148 149 /* hash tables for nfs4_stateowner */ 150 #define OWNER_HASH_BITS 8 151 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 152 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 153 154 #define ownerid_hashval(id) \ 155 ((id) & OWNER_HASH_MASK) 156 #define ownerstr_hashval(clientid, ownername) \ 157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 158 159 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 160 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 161 162 /* hash table for nfs4_file */ 163 #define FILE_HASH_BITS 8 164 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 165 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 166 /* hash table for (open)nfs4_stateid */ 167 #define STATEID_HASH_BITS 10 168 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 169 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 170 171 #define file_hashval(x) \ 172 hash_ptr(x, FILE_HASH_BITS) 173 #define stateid_hashval(owner_id, file_id) \ 174 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 175 176 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 177 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 178 179 static struct nfs4_delegation * 180 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 181 { 182 struct nfs4_delegation *dp; 183 struct nfs4_file *fp = stp->st_file; 184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback; 185 186 dprintk("NFSD alloc_init_deleg\n"); 187 if (fp->fi_had_conflict) 188 return NULL; 189 if (num_delegations > max_delegations) 190 return NULL; 191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); 192 if (dp == NULL) 193 return dp; 194 num_delegations++; 195 INIT_LIST_HEAD(&dp->dl_perfile); 196 INIT_LIST_HEAD(&dp->dl_perclnt); 197 INIT_LIST_HEAD(&dp->dl_recall_lru); 198 dp->dl_client = clp; 199 get_nfs4_file(fp); 200 dp->dl_file = fp; 201 dp->dl_flock = NULL; 202 get_file(stp->st_vfs_file); 203 dp->dl_vfs_file = stp->st_vfs_file; 204 dp->dl_type = type; 205 dp->dl_recall.cbr_dp = NULL; 206 dp->dl_recall.cbr_ident = cb->cb_ident; 207 dp->dl_recall.cbr_trunc = 0; 208 dp->dl_stateid.si_boot = boot_time; 209 dp->dl_stateid.si_stateownerid = current_delegid++; 210 dp->dl_stateid.si_fileid = 0; 211 dp->dl_stateid.si_generation = 0; 212 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle); 213 dp->dl_time = 0; 214 atomic_set(&dp->dl_count, 1); 215 list_add(&dp->dl_perfile, &fp->fi_delegations); 216 list_add(&dp->dl_perclnt, &clp->cl_delegations); 217 return dp; 218 } 219 220 void 221 nfs4_put_delegation(struct nfs4_delegation *dp) 222 { 223 if (atomic_dec_and_test(&dp->dl_count)) { 224 dprintk("NFSD: freeing dp %p\n",dp); 225 put_nfs4_file(dp->dl_file); 226 kmem_cache_free(deleg_slab, dp); 227 num_delegations--; 228 } 229 } 230 231 /* Remove the associated file_lock first, then remove the delegation. 232 * lease_modify() is called to remove the FS_LEASE file_lock from 233 * the i_flock list, eventually calling nfsd's lock_manager 234 * fl_release_callback. 235 */ 236 static void 237 nfs4_close_delegation(struct nfs4_delegation *dp) 238 { 239 struct file *filp = dp->dl_vfs_file; 240 241 dprintk("NFSD: close_delegation dp %p\n",dp); 242 dp->dl_vfs_file = NULL; 243 /* The following nfsd_close may not actually close the file, 244 * but we want to remove the lease in any case. */ 245 if (dp->dl_flock) 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock); 247 nfsd_close(filp); 248 } 249 250 /* Called under the state lock. */ 251 static void 252 unhash_delegation(struct nfs4_delegation *dp) 253 { 254 list_del_init(&dp->dl_perfile); 255 list_del_init(&dp->dl_perclnt); 256 spin_lock(&recall_lock); 257 list_del_init(&dp->dl_recall_lru); 258 spin_unlock(&recall_lock); 259 nfs4_close_delegation(dp); 260 nfs4_put_delegation(dp); 261 } 262 263 /* 264 * SETCLIENTID state 265 */ 266 267 /* Hash tables for nfs4_clientid state */ 268 #define CLIENT_HASH_BITS 4 269 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 270 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 271 272 #define clientid_hashval(id) \ 273 ((id) & CLIENT_HASH_MASK) 274 #define clientstr_hashval(name) \ 275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK) 276 /* 277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 278 * used in reboot/reset lease grace period processing 279 * 280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 281 * setclientid_confirmed info. 282 * 283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 284 * setclientid info. 285 * 286 * client_lru holds client queue ordered by nfs4_client.cl_time 287 * for lease renewal. 288 * 289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 290 * for last close replay. 291 */ 292 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 293 static int reclaim_str_hashtbl_size = 0; 294 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 295 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 296 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 297 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 298 static struct list_head client_lru; 299 static struct list_head close_lru; 300 301 static void unhash_generic_stateid(struct nfs4_stateid *stp) 302 { 303 list_del(&stp->st_hash); 304 list_del(&stp->st_perfile); 305 list_del(&stp->st_perstateowner); 306 } 307 308 static void free_generic_stateid(struct nfs4_stateid *stp) 309 { 310 put_nfs4_file(stp->st_file); 311 kmem_cache_free(stateid_slab, stp); 312 } 313 314 static void release_lock_stateid(struct nfs4_stateid *stp) 315 { 316 unhash_generic_stateid(stp); 317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner); 318 free_generic_stateid(stp); 319 } 320 321 static void unhash_lockowner(struct nfs4_stateowner *sop) 322 { 323 struct nfs4_stateid *stp; 324 325 list_del(&sop->so_idhash); 326 list_del(&sop->so_strhash); 327 list_del(&sop->so_perstateid); 328 while (!list_empty(&sop->so_stateids)) { 329 stp = list_first_entry(&sop->so_stateids, 330 struct nfs4_stateid, st_perstateowner); 331 release_lock_stateid(stp); 332 } 333 } 334 335 static void release_lockowner(struct nfs4_stateowner *sop) 336 { 337 unhash_lockowner(sop); 338 nfs4_put_stateowner(sop); 339 } 340 341 static void 342 release_stateid_lockowners(struct nfs4_stateid *open_stp) 343 { 344 struct nfs4_stateowner *lock_sop; 345 346 while (!list_empty(&open_stp->st_lockowners)) { 347 lock_sop = list_entry(open_stp->st_lockowners.next, 348 struct nfs4_stateowner, so_perstateid); 349 /* list_del(&open_stp->st_lockowners); */ 350 BUG_ON(lock_sop->so_is_open_owner); 351 release_lockowner(lock_sop); 352 } 353 } 354 355 static void release_open_stateid(struct nfs4_stateid *stp) 356 { 357 unhash_generic_stateid(stp); 358 release_stateid_lockowners(stp); 359 nfsd_close(stp->st_vfs_file); 360 free_generic_stateid(stp); 361 } 362 363 static void unhash_openowner(struct nfs4_stateowner *sop) 364 { 365 struct nfs4_stateid *stp; 366 367 list_del(&sop->so_idhash); 368 list_del(&sop->so_strhash); 369 list_del(&sop->so_perclient); 370 list_del(&sop->so_perstateid); /* XXX: necessary? */ 371 while (!list_empty(&sop->so_stateids)) { 372 stp = list_first_entry(&sop->so_stateids, 373 struct nfs4_stateid, st_perstateowner); 374 release_open_stateid(stp); 375 } 376 } 377 378 static void release_openowner(struct nfs4_stateowner *sop) 379 { 380 unhash_openowner(sop); 381 list_del(&sop->so_close_lru); 382 nfs4_put_stateowner(sop); 383 } 384 385 static DEFINE_SPINLOCK(sessionid_lock); 386 #define SESSION_HASH_SIZE 512 387 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE]; 388 389 static inline int 390 hash_sessionid(struct nfs4_sessionid *sessionid) 391 { 392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; 393 394 return sid->sequence % SESSION_HASH_SIZE; 395 } 396 397 static inline void 398 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) 399 { 400 u32 *ptr = (u32 *)(&sessionid->data[0]); 401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); 402 } 403 404 /* caller must hold sessionid_lock */ 405 static struct nfsd4_session * 406 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid) 407 { 408 struct nfsd4_session *elem; 409 int idx; 410 411 dump_sessionid(__func__, sessionid); 412 idx = hash_sessionid(sessionid); 413 dprintk("%s: idx is %d\n", __func__, idx); 414 /* Search in the appropriate list */ 415 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) { 416 dump_sessionid("list traversal", &elem->se_sessionid); 417 if (!memcmp(elem->se_sessionid.data, sessionid->data, 418 NFS4_MAX_SESSIONID_LEN)) { 419 return elem; 420 } 421 } 422 423 dprintk("%s: session not found\n", __func__); 424 return NULL; 425 } 426 427 /* caller must hold sessionid_lock */ 428 static void 429 unhash_session(struct nfsd4_session *ses) 430 { 431 list_del(&ses->se_hash); 432 list_del(&ses->se_perclnt); 433 } 434 435 static void 436 release_session(struct nfsd4_session *ses) 437 { 438 spin_lock(&sessionid_lock); 439 unhash_session(ses); 440 spin_unlock(&sessionid_lock); 441 nfsd4_put_session(ses); 442 } 443 444 void 445 free_session(struct kref *kref) 446 { 447 struct nfsd4_session *ses; 448 449 ses = container_of(kref, struct nfsd4_session, se_ref); 450 kfree(ses->se_slots); 451 kfree(ses); 452 } 453 454 static inline void 455 renew_client(struct nfs4_client *clp) 456 { 457 /* 458 * Move client to the end to the LRU list. 459 */ 460 dprintk("renewing client (clientid %08x/%08x)\n", 461 clp->cl_clientid.cl_boot, 462 clp->cl_clientid.cl_id); 463 list_move_tail(&clp->cl_lru, &client_lru); 464 clp->cl_time = get_seconds(); 465 } 466 467 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 468 static int 469 STALE_CLIENTID(clientid_t *clid) 470 { 471 if (clid->cl_boot == boot_time) 472 return 0; 473 dprintk("NFSD stale clientid (%08x/%08x)\n", 474 clid->cl_boot, clid->cl_id); 475 return 1; 476 } 477 478 /* 479 * XXX Should we use a slab cache ? 480 * This type of memory management is somewhat inefficient, but we use it 481 * anyway since SETCLIENTID is not a common operation. 482 */ 483 static struct nfs4_client *alloc_client(struct xdr_netobj name) 484 { 485 struct nfs4_client *clp; 486 487 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); 488 if (clp == NULL) 489 return NULL; 490 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL); 491 if (clp->cl_name.data == NULL) { 492 kfree(clp); 493 return NULL; 494 } 495 memcpy(clp->cl_name.data, name.data, name.len); 496 clp->cl_name.len = name.len; 497 return clp; 498 } 499 500 static void 501 shutdown_callback_client(struct nfs4_client *clp) 502 { 503 struct rpc_clnt *clnt = clp->cl_callback.cb_client; 504 505 if (clnt) { 506 /* 507 * Callback threads take a reference on the client, so there 508 * should be no outstanding callbacks at this point. 509 */ 510 clp->cl_callback.cb_client = NULL; 511 rpc_shutdown_client(clnt); 512 } 513 } 514 515 static inline void 516 free_client(struct nfs4_client *clp) 517 { 518 shutdown_callback_client(clp); 519 if (clp->cl_cred.cr_group_info) 520 put_group_info(clp->cl_cred.cr_group_info); 521 kfree(clp->cl_principal); 522 kfree(clp->cl_name.data); 523 kfree(clp); 524 } 525 526 void 527 put_nfs4_client(struct nfs4_client *clp) 528 { 529 if (atomic_dec_and_test(&clp->cl_count)) 530 free_client(clp); 531 } 532 533 static void 534 expire_client(struct nfs4_client *clp) 535 { 536 struct nfs4_stateowner *sop; 537 struct nfs4_delegation *dp; 538 struct list_head reaplist; 539 540 dprintk("NFSD: expire_client cl_count %d\n", 541 atomic_read(&clp->cl_count)); 542 543 INIT_LIST_HEAD(&reaplist); 544 spin_lock(&recall_lock); 545 while (!list_empty(&clp->cl_delegations)) { 546 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 547 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 548 dp->dl_flock); 549 list_del_init(&dp->dl_perclnt); 550 list_move(&dp->dl_recall_lru, &reaplist); 551 } 552 spin_unlock(&recall_lock); 553 while (!list_empty(&reaplist)) { 554 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 555 list_del_init(&dp->dl_recall_lru); 556 unhash_delegation(dp); 557 } 558 list_del(&clp->cl_idhash); 559 list_del(&clp->cl_strhash); 560 list_del(&clp->cl_lru); 561 while (!list_empty(&clp->cl_openowners)) { 562 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); 563 release_openowner(sop); 564 } 565 while (!list_empty(&clp->cl_sessions)) { 566 struct nfsd4_session *ses; 567 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, 568 se_perclnt); 569 release_session(ses); 570 } 571 put_nfs4_client(clp); 572 } 573 574 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir) 575 { 576 struct nfs4_client *clp; 577 578 clp = alloc_client(name); 579 if (clp == NULL) 580 return NULL; 581 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); 582 atomic_set(&clp->cl_count, 1); 583 atomic_set(&clp->cl_callback.cb_set, 0); 584 INIT_LIST_HEAD(&clp->cl_idhash); 585 INIT_LIST_HEAD(&clp->cl_strhash); 586 INIT_LIST_HEAD(&clp->cl_openowners); 587 INIT_LIST_HEAD(&clp->cl_delegations); 588 INIT_LIST_HEAD(&clp->cl_sessions); 589 INIT_LIST_HEAD(&clp->cl_lru); 590 return clp; 591 } 592 593 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) 594 { 595 memcpy(target->cl_verifier.data, source->data, 596 sizeof(target->cl_verifier.data)); 597 } 598 599 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) 600 { 601 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 602 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 603 } 604 605 static void copy_cred(struct svc_cred *target, struct svc_cred *source) 606 { 607 target->cr_uid = source->cr_uid; 608 target->cr_gid = source->cr_gid; 609 target->cr_group_info = source->cr_group_info; 610 get_group_info(target->cr_group_info); 611 } 612 613 static int same_name(const char *n1, const char *n2) 614 { 615 return 0 == memcmp(n1, n2, HEXDIR_LEN); 616 } 617 618 static int 619 same_verf(nfs4_verifier *v1, nfs4_verifier *v2) 620 { 621 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); 622 } 623 624 static int 625 same_clid(clientid_t *cl1, clientid_t *cl2) 626 { 627 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); 628 } 629 630 /* XXX what about NGROUP */ 631 static int 632 same_creds(struct svc_cred *cr1, struct svc_cred *cr2) 633 { 634 return cr1->cr_uid == cr2->cr_uid; 635 } 636 637 static void gen_clid(struct nfs4_client *clp) 638 { 639 static u32 current_clientid = 1; 640 641 clp->cl_clientid.cl_boot = boot_time; 642 clp->cl_clientid.cl_id = current_clientid++; 643 } 644 645 static void gen_confirm(struct nfs4_client *clp) 646 { 647 static u32 i; 648 u32 *p; 649 650 p = (u32 *)clp->cl_confirm.data; 651 *p++ = get_seconds(); 652 *p++ = i++; 653 } 654 655 static int check_name(struct xdr_netobj name) 656 { 657 if (name.len == 0) 658 return 0; 659 if (name.len > NFS4_OPAQUE_LIMIT) { 660 dprintk("NFSD: check_name: name too long(%d)!\n", name.len); 661 return 0; 662 } 663 return 1; 664 } 665 666 static void 667 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 668 { 669 unsigned int idhashval; 670 671 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 672 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 673 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 674 list_add_tail(&clp->cl_lru, &client_lru); 675 clp->cl_time = get_seconds(); 676 } 677 678 static void 679 move_to_confirmed(struct nfs4_client *clp) 680 { 681 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 682 unsigned int strhashval; 683 684 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 685 list_del_init(&clp->cl_strhash); 686 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 687 strhashval = clientstr_hashval(clp->cl_recdir); 688 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 689 renew_client(clp); 690 } 691 692 static struct nfs4_client * 693 find_confirmed_client(clientid_t *clid) 694 { 695 struct nfs4_client *clp; 696 unsigned int idhashval = clientid_hashval(clid->cl_id); 697 698 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 699 if (same_clid(&clp->cl_clientid, clid)) 700 return clp; 701 } 702 return NULL; 703 } 704 705 static struct nfs4_client * 706 find_unconfirmed_client(clientid_t *clid) 707 { 708 struct nfs4_client *clp; 709 unsigned int idhashval = clientid_hashval(clid->cl_id); 710 711 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 712 if (same_clid(&clp->cl_clientid, clid)) 713 return clp; 714 } 715 return NULL; 716 } 717 718 static struct nfs4_client * 719 find_confirmed_client_by_str(const char *dname, unsigned int hashval) 720 { 721 struct nfs4_client *clp; 722 723 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { 724 if (same_name(clp->cl_recdir, dname)) 725 return clp; 726 } 727 return NULL; 728 } 729 730 static struct nfs4_client * 731 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval) 732 { 733 struct nfs4_client *clp; 734 735 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { 736 if (same_name(clp->cl_recdir, dname)) 737 return clp; 738 } 739 return NULL; 740 } 741 742 /* a helper function for parse_callback */ 743 static int 744 parse_octet(unsigned int *lenp, char **addrp) 745 { 746 unsigned int len = *lenp; 747 char *p = *addrp; 748 int n = -1; 749 char c; 750 751 for (;;) { 752 if (!len) 753 break; 754 len--; 755 c = *p++; 756 if (c == '.') 757 break; 758 if ((c < '0') || (c > '9')) { 759 n = -1; 760 break; 761 } 762 if (n < 0) 763 n = 0; 764 n = (n * 10) + (c - '0'); 765 if (n > 255) { 766 n = -1; 767 break; 768 } 769 } 770 *lenp = len; 771 *addrp = p; 772 return n; 773 } 774 775 /* parse and set the setclientid ipv4 callback address */ 776 static int 777 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp) 778 { 779 int temp = 0; 780 u32 cbaddr = 0; 781 u16 cbport = 0; 782 u32 addrlen = addr_len; 783 char *addr = addr_val; 784 int i, shift; 785 786 /* ipaddress */ 787 shift = 24; 788 for(i = 4; i > 0 ; i--) { 789 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 790 return 0; 791 } 792 cbaddr |= (temp << shift); 793 if (shift > 0) 794 shift -= 8; 795 } 796 *cbaddrp = cbaddr; 797 798 /* port */ 799 shift = 8; 800 for(i = 2; i > 0 ; i--) { 801 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 802 return 0; 803 } 804 cbport |= (temp << shift); 805 if (shift > 0) 806 shift -= 8; 807 } 808 *cbportp = cbport; 809 return 1; 810 } 811 812 static void 813 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se) 814 { 815 struct nfs4_callback *cb = &clp->cl_callback; 816 817 /* Currently, we only support tcp for the callback channel */ 818 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3)) 819 goto out_err; 820 821 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val, 822 &cb->cb_addr, &cb->cb_port))) 823 goto out_err; 824 cb->cb_prog = se->se_callback_prog; 825 cb->cb_ident = se->se_callback_ident; 826 return; 827 out_err: 828 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 829 "will not receive delegations\n", 830 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 831 832 return; 833 } 834 835 __be32 836 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 837 struct nfsd4_setclientid *setclid) 838 { 839 struct sockaddr_in *sin = svc_addr_in(rqstp); 840 struct xdr_netobj clname = { 841 .len = setclid->se_namelen, 842 .data = setclid->se_name, 843 }; 844 nfs4_verifier clverifier = setclid->se_verf; 845 unsigned int strhashval; 846 struct nfs4_client *conf, *unconf, *new; 847 __be32 status; 848 char *princ; 849 char dname[HEXDIR_LEN]; 850 851 if (!check_name(clname)) 852 return nfserr_inval; 853 854 status = nfs4_make_rec_clidname(dname, &clname); 855 if (status) 856 return status; 857 858 /* 859 * XXX The Duplicate Request Cache (DRC) has been checked (??) 860 * We get here on a DRC miss. 861 */ 862 863 strhashval = clientstr_hashval(dname); 864 865 nfs4_lock_state(); 866 conf = find_confirmed_client_by_str(dname, strhashval); 867 if (conf) { 868 /* RFC 3530 14.2.33 CASE 0: */ 869 status = nfserr_clid_inuse; 870 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 871 dprintk("NFSD: setclientid: string in use by client" 872 " at %pI4\n", &conf->cl_addr); 873 goto out; 874 } 875 } 876 /* 877 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION") 878 * has a description of SETCLIENTID request processing consisting 879 * of 5 bullet points, labeled as CASE0 - CASE4 below. 880 */ 881 unconf = find_unconfirmed_client_by_str(dname, strhashval); 882 status = nfserr_resource; 883 if (!conf) { 884 /* 885 * RFC 3530 14.2.33 CASE 4: 886 * placed first, because it is the normal case 887 */ 888 if (unconf) 889 expire_client(unconf); 890 new = create_client(clname, dname); 891 if (new == NULL) 892 goto out; 893 gen_clid(new); 894 } else if (same_verf(&conf->cl_verifier, &clverifier)) { 895 /* 896 * RFC 3530 14.2.33 CASE 1: 897 * probable callback update 898 */ 899 if (unconf) { 900 /* Note this is removing unconfirmed {*x***}, 901 * which is stronger than RFC recommended {vxc**}. 902 * This has the advantage that there is at most 903 * one {*x***} in either list at any time. 904 */ 905 expire_client(unconf); 906 } 907 new = create_client(clname, dname); 908 if (new == NULL) 909 goto out; 910 copy_clid(new, conf); 911 } else if (!unconf) { 912 /* 913 * RFC 3530 14.2.33 CASE 2: 914 * probable client reboot; state will be removed if 915 * confirmed. 916 */ 917 new = create_client(clname, dname); 918 if (new == NULL) 919 goto out; 920 gen_clid(new); 921 } else { 922 /* 923 * RFC 3530 14.2.33 CASE 3: 924 * probable client reboot; state will be removed if 925 * confirmed. 926 */ 927 expire_client(unconf); 928 new = create_client(clname, dname); 929 if (new == NULL) 930 goto out; 931 gen_clid(new); 932 } 933 copy_verf(new, &clverifier); 934 new->cl_addr = sin->sin_addr.s_addr; 935 new->cl_flavor = rqstp->rq_flavor; 936 princ = svc_gss_principal(rqstp); 937 if (princ) { 938 new->cl_principal = kstrdup(princ, GFP_KERNEL); 939 if (new->cl_principal == NULL) { 940 free_client(new); 941 goto out; 942 } 943 } 944 copy_cred(&new->cl_cred, &rqstp->rq_cred); 945 gen_confirm(new); 946 gen_callback(new, setclid); 947 add_to_unconfirmed(new, strhashval); 948 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 949 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 950 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 951 status = nfs_ok; 952 out: 953 nfs4_unlock_state(); 954 return status; 955 } 956 957 958 /* 959 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has 960 * a description of SETCLIENTID_CONFIRM request processing consisting of 4 961 * bullets, labeled as CASE1 - CASE4 below. 962 */ 963 __be32 964 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 965 struct nfsd4_compound_state *cstate, 966 struct nfsd4_setclientid_confirm *setclientid_confirm) 967 { 968 struct sockaddr_in *sin = svc_addr_in(rqstp); 969 struct nfs4_client *conf, *unconf; 970 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 971 clientid_t * clid = &setclientid_confirm->sc_clientid; 972 __be32 status; 973 974 if (STALE_CLIENTID(clid)) 975 return nfserr_stale_clientid; 976 /* 977 * XXX The Duplicate Request Cache (DRC) has been checked (??) 978 * We get here on a DRC miss. 979 */ 980 981 nfs4_lock_state(); 982 983 conf = find_confirmed_client(clid); 984 unconf = find_unconfirmed_client(clid); 985 986 status = nfserr_clid_inuse; 987 if (conf && conf->cl_addr != sin->sin_addr.s_addr) 988 goto out; 989 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr) 990 goto out; 991 992 /* 993 * section 14.2.34 of RFC 3530 has a description of 994 * SETCLIENTID_CONFIRM request processing consisting 995 * of 4 bullet points, labeled as CASE1 - CASE4 below. 996 */ 997 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) { 998 /* 999 * RFC 3530 14.2.34 CASE 1: 1000 * callback update 1001 */ 1002 if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) 1003 status = nfserr_clid_inuse; 1004 else { 1005 /* XXX: We just turn off callbacks until we can handle 1006 * change request correctly. */ 1007 atomic_set(&conf->cl_callback.cb_set, 0); 1008 gen_confirm(conf); 1009 nfsd4_remove_clid_dir(unconf); 1010 expire_client(unconf); 1011 status = nfs_ok; 1012 1013 } 1014 } else if (conf && !unconf) { 1015 /* 1016 * RFC 3530 14.2.34 CASE 2: 1017 * probable retransmitted request; play it safe and 1018 * do nothing. 1019 */ 1020 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) 1021 status = nfserr_clid_inuse; 1022 else 1023 status = nfs_ok; 1024 } else if (!conf && unconf 1025 && same_verf(&unconf->cl_confirm, &confirm)) { 1026 /* 1027 * RFC 3530 14.2.34 CASE 3: 1028 * Normal case; new or rebooted client: 1029 */ 1030 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 1031 status = nfserr_clid_inuse; 1032 } else { 1033 unsigned int hash = 1034 clientstr_hashval(unconf->cl_recdir); 1035 conf = find_confirmed_client_by_str(unconf->cl_recdir, 1036 hash); 1037 if (conf) { 1038 nfsd4_remove_clid_dir(conf); 1039 expire_client(conf); 1040 } 1041 move_to_confirmed(unconf); 1042 conf = unconf; 1043 nfsd4_probe_callback(conf); 1044 status = nfs_ok; 1045 } 1046 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) 1047 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, 1048 &confirm)))) { 1049 /* 1050 * RFC 3530 14.2.34 CASE 4: 1051 * Client probably hasn't noticed that we rebooted yet. 1052 */ 1053 status = nfserr_stale_clientid; 1054 } else { 1055 /* check that we have hit one of the cases...*/ 1056 status = nfserr_clid_inuse; 1057 } 1058 out: 1059 nfs4_unlock_state(); 1060 return status; 1061 } 1062 1063 /* OPEN Share state helper functions */ 1064 static inline struct nfs4_file * 1065 alloc_init_file(struct inode *ino) 1066 { 1067 struct nfs4_file *fp; 1068 unsigned int hashval = file_hashval(ino); 1069 1070 fp = kmem_cache_alloc(file_slab, GFP_KERNEL); 1071 if (fp) { 1072 atomic_set(&fp->fi_ref, 1); 1073 INIT_LIST_HEAD(&fp->fi_hash); 1074 INIT_LIST_HEAD(&fp->fi_stateids); 1075 INIT_LIST_HEAD(&fp->fi_delegations); 1076 spin_lock(&recall_lock); 1077 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 1078 spin_unlock(&recall_lock); 1079 fp->fi_inode = igrab(ino); 1080 fp->fi_id = current_fileid++; 1081 fp->fi_had_conflict = false; 1082 return fp; 1083 } 1084 return NULL; 1085 } 1086 1087 static void 1088 nfsd4_free_slab(struct kmem_cache **slab) 1089 { 1090 if (*slab == NULL) 1091 return; 1092 kmem_cache_destroy(*slab); 1093 *slab = NULL; 1094 } 1095 1096 void 1097 nfsd4_free_slabs(void) 1098 { 1099 nfsd4_free_slab(&stateowner_slab); 1100 nfsd4_free_slab(&file_slab); 1101 nfsd4_free_slab(&stateid_slab); 1102 nfsd4_free_slab(&deleg_slab); 1103 } 1104 1105 static int 1106 nfsd4_init_slabs(void) 1107 { 1108 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 1109 sizeof(struct nfs4_stateowner), 0, 0, NULL); 1110 if (stateowner_slab == NULL) 1111 goto out_nomem; 1112 file_slab = kmem_cache_create("nfsd4_files", 1113 sizeof(struct nfs4_file), 0, 0, NULL); 1114 if (file_slab == NULL) 1115 goto out_nomem; 1116 stateid_slab = kmem_cache_create("nfsd4_stateids", 1117 sizeof(struct nfs4_stateid), 0, 0, NULL); 1118 if (stateid_slab == NULL) 1119 goto out_nomem; 1120 deleg_slab = kmem_cache_create("nfsd4_delegations", 1121 sizeof(struct nfs4_delegation), 0, 0, NULL); 1122 if (deleg_slab == NULL) 1123 goto out_nomem; 1124 return 0; 1125 out_nomem: 1126 nfsd4_free_slabs(); 1127 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 1128 return -ENOMEM; 1129 } 1130 1131 void 1132 nfs4_free_stateowner(struct kref *kref) 1133 { 1134 struct nfs4_stateowner *sop = 1135 container_of(kref, struct nfs4_stateowner, so_ref); 1136 kfree(sop->so_owner.data); 1137 kmem_cache_free(stateowner_slab, sop); 1138 } 1139 1140 static inline struct nfs4_stateowner * 1141 alloc_stateowner(struct xdr_netobj *owner) 1142 { 1143 struct nfs4_stateowner *sop; 1144 1145 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 1146 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 1147 memcpy(sop->so_owner.data, owner->data, owner->len); 1148 sop->so_owner.len = owner->len; 1149 kref_init(&sop->so_ref); 1150 return sop; 1151 } 1152 kmem_cache_free(stateowner_slab, sop); 1153 } 1154 return NULL; 1155 } 1156 1157 static struct nfs4_stateowner * 1158 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 1159 struct nfs4_stateowner *sop; 1160 struct nfs4_replay *rp; 1161 unsigned int idhashval; 1162 1163 if (!(sop = alloc_stateowner(&open->op_owner))) 1164 return NULL; 1165 idhashval = ownerid_hashval(current_ownerid); 1166 INIT_LIST_HEAD(&sop->so_idhash); 1167 INIT_LIST_HEAD(&sop->so_strhash); 1168 INIT_LIST_HEAD(&sop->so_perclient); 1169 INIT_LIST_HEAD(&sop->so_stateids); 1170 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ 1171 INIT_LIST_HEAD(&sop->so_close_lru); 1172 sop->so_time = 0; 1173 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 1174 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 1175 list_add(&sop->so_perclient, &clp->cl_openowners); 1176 sop->so_is_open_owner = 1; 1177 sop->so_id = current_ownerid++; 1178 sop->so_client = clp; 1179 sop->so_seqid = open->op_seqid; 1180 sop->so_confirmed = 0; 1181 rp = &sop->so_replay; 1182 rp->rp_status = nfserr_serverfault; 1183 rp->rp_buflen = 0; 1184 rp->rp_buf = rp->rp_ibuf; 1185 return sop; 1186 } 1187 1188 static inline void 1189 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 1190 struct nfs4_stateowner *sop = open->op_stateowner; 1191 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 1192 1193 INIT_LIST_HEAD(&stp->st_hash); 1194 INIT_LIST_HEAD(&stp->st_perstateowner); 1195 INIT_LIST_HEAD(&stp->st_lockowners); 1196 INIT_LIST_HEAD(&stp->st_perfile); 1197 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 1198 list_add(&stp->st_perstateowner, &sop->so_stateids); 1199 list_add(&stp->st_perfile, &fp->fi_stateids); 1200 stp->st_stateowner = sop; 1201 get_nfs4_file(fp); 1202 stp->st_file = fp; 1203 stp->st_stateid.si_boot = boot_time; 1204 stp->st_stateid.si_stateownerid = sop->so_id; 1205 stp->st_stateid.si_fileid = fp->fi_id; 1206 stp->st_stateid.si_generation = 0; 1207 stp->st_access_bmap = 0; 1208 stp->st_deny_bmap = 0; 1209 __set_bit(open->op_share_access, &stp->st_access_bmap); 1210 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1211 stp->st_openstp = NULL; 1212 } 1213 1214 static void 1215 move_to_close_lru(struct nfs4_stateowner *sop) 1216 { 1217 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 1218 1219 list_move_tail(&sop->so_close_lru, &close_lru); 1220 sop->so_time = get_seconds(); 1221 } 1222 1223 static int 1224 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, 1225 clientid_t *clid) 1226 { 1227 return (sop->so_owner.len == owner->len) && 1228 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && 1229 (sop->so_client->cl_clientid.cl_id == clid->cl_id); 1230 } 1231 1232 static struct nfs4_stateowner * 1233 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) 1234 { 1235 struct nfs4_stateowner *so = NULL; 1236 1237 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { 1238 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) 1239 return so; 1240 } 1241 return NULL; 1242 } 1243 1244 /* search file_hashtbl[] for file */ 1245 static struct nfs4_file * 1246 find_file(struct inode *ino) 1247 { 1248 unsigned int hashval = file_hashval(ino); 1249 struct nfs4_file *fp; 1250 1251 spin_lock(&recall_lock); 1252 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { 1253 if (fp->fi_inode == ino) { 1254 get_nfs4_file(fp); 1255 spin_unlock(&recall_lock); 1256 return fp; 1257 } 1258 } 1259 spin_unlock(&recall_lock); 1260 return NULL; 1261 } 1262 1263 static inline int access_valid(u32 x) 1264 { 1265 if (x < NFS4_SHARE_ACCESS_READ) 1266 return 0; 1267 if (x > NFS4_SHARE_ACCESS_BOTH) 1268 return 0; 1269 return 1; 1270 } 1271 1272 static inline int deny_valid(u32 x) 1273 { 1274 /* Note: unlike access bits, deny bits may be zero. */ 1275 return x <= NFS4_SHARE_DENY_BOTH; 1276 } 1277 1278 /* 1279 * We store the NONE, READ, WRITE, and BOTH bits separately in the 1280 * st_{access,deny}_bmap field of the stateid, in order to track not 1281 * only what share bits are currently in force, but also what 1282 * combinations of share bits previous opens have used. This allows us 1283 * to enforce the recommendation of rfc 3530 14.2.19 that the server 1284 * return an error if the client attempt to downgrade to a combination 1285 * of share bits not explicable by closing some of its previous opens. 1286 * 1287 * XXX: This enforcement is actually incomplete, since we don't keep 1288 * track of access/deny bit combinations; so, e.g., we allow: 1289 * 1290 * OPEN allow read, deny write 1291 * OPEN allow both, deny none 1292 * DOWNGRADE allow read, deny none 1293 * 1294 * which we should reject. 1295 */ 1296 static void 1297 set_access(unsigned int *access, unsigned long bmap) { 1298 int i; 1299 1300 *access = 0; 1301 for (i = 1; i < 4; i++) { 1302 if (test_bit(i, &bmap)) 1303 *access |= i; 1304 } 1305 } 1306 1307 static void 1308 set_deny(unsigned int *deny, unsigned long bmap) { 1309 int i; 1310 1311 *deny = 0; 1312 for (i = 0; i < 4; i++) { 1313 if (test_bit(i, &bmap)) 1314 *deny |= i ; 1315 } 1316 } 1317 1318 static int 1319 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 1320 unsigned int access, deny; 1321 1322 set_access(&access, stp->st_access_bmap); 1323 set_deny(&deny, stp->st_deny_bmap); 1324 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 1325 return 0; 1326 return 1; 1327 } 1328 1329 /* 1330 * Called to check deny when READ with all zero stateid or 1331 * WRITE with all zero or all one stateid 1332 */ 1333 static __be32 1334 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 1335 { 1336 struct inode *ino = current_fh->fh_dentry->d_inode; 1337 struct nfs4_file *fp; 1338 struct nfs4_stateid *stp; 1339 __be32 ret; 1340 1341 dprintk("NFSD: nfs4_share_conflict\n"); 1342 1343 fp = find_file(ino); 1344 if (!fp) 1345 return nfs_ok; 1346 ret = nfserr_locked; 1347 /* Search for conflicting share reservations */ 1348 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { 1349 if (test_bit(deny_type, &stp->st_deny_bmap) || 1350 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 1351 goto out; 1352 } 1353 ret = nfs_ok; 1354 out: 1355 put_nfs4_file(fp); 1356 return ret; 1357 } 1358 1359 static inline void 1360 nfs4_file_downgrade(struct file *filp, unsigned int share_access) 1361 { 1362 if (share_access & NFS4_SHARE_ACCESS_WRITE) { 1363 drop_file_write_access(filp); 1364 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; 1365 } 1366 } 1367 1368 /* 1369 * Recall a delegation 1370 */ 1371 static int 1372 do_recall(void *__dp) 1373 { 1374 struct nfs4_delegation *dp = __dp; 1375 1376 dp->dl_file->fi_had_conflict = true; 1377 nfsd4_cb_recall(dp); 1378 return 0; 1379 } 1380 1381 /* 1382 * Spawn a thread to perform a recall on the delegation represented 1383 * by the lease (file_lock) 1384 * 1385 * Called from break_lease() with lock_kernel() held. 1386 * Note: we assume break_lease will only call this *once* for any given 1387 * lease. 1388 */ 1389 static 1390 void nfsd_break_deleg_cb(struct file_lock *fl) 1391 { 1392 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner; 1393 struct task_struct *t; 1394 1395 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 1396 if (!dp) 1397 return; 1398 1399 /* We're assuming the state code never drops its reference 1400 * without first removing the lease. Since we're in this lease 1401 * callback (and since the lease code is serialized by the kernel 1402 * lock) we know the server hasn't removed the lease yet, we know 1403 * it's safe to take a reference: */ 1404 atomic_inc(&dp->dl_count); 1405 atomic_inc(&dp->dl_client->cl_count); 1406 1407 spin_lock(&recall_lock); 1408 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 1409 spin_unlock(&recall_lock); 1410 1411 /* only place dl_time is set. protected by lock_kernel*/ 1412 dp->dl_time = get_seconds(); 1413 1414 /* 1415 * We don't want the locks code to timeout the lease for us; 1416 * we'll remove it ourself if the delegation isn't returned 1417 * in time. 1418 */ 1419 fl->fl_break_time = 0; 1420 1421 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall"); 1422 if (IS_ERR(t)) { 1423 struct nfs4_client *clp = dp->dl_client; 1424 1425 printk(KERN_INFO "NFSD: Callback thread failed for " 1426 "for client (clientid %08x/%08x)\n", 1427 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 1428 put_nfs4_client(dp->dl_client); 1429 nfs4_put_delegation(dp); 1430 } 1431 } 1432 1433 /* 1434 * The file_lock is being reapd. 1435 * 1436 * Called by locks_free_lock() with lock_kernel() held. 1437 */ 1438 static 1439 void nfsd_release_deleg_cb(struct file_lock *fl) 1440 { 1441 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 1442 1443 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count)); 1444 1445 if (!(fl->fl_flags & FL_LEASE) || !dp) 1446 return; 1447 dp->dl_flock = NULL; 1448 } 1449 1450 /* 1451 * Set the delegation file_lock back pointer. 1452 * 1453 * Called from setlease() with lock_kernel() held. 1454 */ 1455 static 1456 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl) 1457 { 1458 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner; 1459 1460 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp); 1461 if (!dp) 1462 return; 1463 dp->dl_flock = new; 1464 } 1465 1466 /* 1467 * Called from setlease() with lock_kernel() held 1468 */ 1469 static 1470 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) 1471 { 1472 struct nfs4_delegation *onlistd = 1473 (struct nfs4_delegation *)onlist->fl_owner; 1474 struct nfs4_delegation *tryd = 1475 (struct nfs4_delegation *)try->fl_owner; 1476 1477 if (onlist->fl_lmops != try->fl_lmops) 1478 return 0; 1479 1480 return onlistd->dl_client == tryd->dl_client; 1481 } 1482 1483 1484 static 1485 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) 1486 { 1487 if (arg & F_UNLCK) 1488 return lease_modify(onlist, arg); 1489 else 1490 return -EAGAIN; 1491 } 1492 1493 static struct lock_manager_operations nfsd_lease_mng_ops = { 1494 .fl_break = nfsd_break_deleg_cb, 1495 .fl_release_private = nfsd_release_deleg_cb, 1496 .fl_copy_lock = nfsd_copy_lock_deleg_cb, 1497 .fl_mylease = nfsd_same_client_deleg_cb, 1498 .fl_change = nfsd_change_deleg_cb, 1499 }; 1500 1501 1502 __be32 1503 nfsd4_process_open1(struct nfsd4_open *open) 1504 { 1505 clientid_t *clientid = &open->op_clientid; 1506 struct nfs4_client *clp = NULL; 1507 unsigned int strhashval; 1508 struct nfs4_stateowner *sop = NULL; 1509 1510 if (!check_name(open->op_owner)) 1511 return nfserr_inval; 1512 1513 if (STALE_CLIENTID(&open->op_clientid)) 1514 return nfserr_stale_clientid; 1515 1516 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); 1517 sop = find_openstateowner_str(strhashval, open); 1518 open->op_stateowner = sop; 1519 if (!sop) { 1520 /* Make sure the client's lease hasn't expired. */ 1521 clp = find_confirmed_client(clientid); 1522 if (clp == NULL) 1523 return nfserr_expired; 1524 goto renew; 1525 } 1526 if (!sop->so_confirmed) { 1527 /* Replace unconfirmed owners without checking for replay. */ 1528 clp = sop->so_client; 1529 release_openowner(sop); 1530 open->op_stateowner = NULL; 1531 goto renew; 1532 } 1533 if (open->op_seqid == sop->so_seqid - 1) { 1534 if (sop->so_replay.rp_buflen) 1535 return nfserr_replay_me; 1536 /* The original OPEN failed so spectacularly 1537 * that we don't even have replay data saved! 1538 * Therefore, we have no choice but to continue 1539 * processing this OPEN; presumably, we'll 1540 * fail again for the same reason. 1541 */ 1542 dprintk("nfsd4_process_open1: replay with no replay cache\n"); 1543 goto renew; 1544 } 1545 if (open->op_seqid != sop->so_seqid) 1546 return nfserr_bad_seqid; 1547 renew: 1548 if (open->op_stateowner == NULL) { 1549 sop = alloc_init_open_stateowner(strhashval, clp, open); 1550 if (sop == NULL) 1551 return nfserr_resource; 1552 open->op_stateowner = sop; 1553 } 1554 list_del_init(&sop->so_close_lru); 1555 renew_client(sop->so_client); 1556 return nfs_ok; 1557 } 1558 1559 static inline __be32 1560 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 1561 { 1562 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 1563 return nfserr_openmode; 1564 else 1565 return nfs_ok; 1566 } 1567 1568 static struct nfs4_delegation * 1569 find_delegation_file(struct nfs4_file *fp, stateid_t *stid) 1570 { 1571 struct nfs4_delegation *dp; 1572 1573 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) { 1574 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) 1575 return dp; 1576 } 1577 return NULL; 1578 } 1579 1580 static __be32 1581 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, 1582 struct nfs4_delegation **dp) 1583 { 1584 int flags; 1585 __be32 status = nfserr_bad_stateid; 1586 1587 *dp = find_delegation_file(fp, &open->op_delegate_stateid); 1588 if (*dp == NULL) 1589 goto out; 1590 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ? 1591 RD_STATE : WR_STATE; 1592 status = nfs4_check_delegmode(*dp, flags); 1593 if (status) 1594 *dp = NULL; 1595 out: 1596 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR) 1597 return nfs_ok; 1598 if (status) 1599 return status; 1600 open->op_stateowner->so_confirmed = 1; 1601 return nfs_ok; 1602 } 1603 1604 static __be32 1605 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 1606 { 1607 struct nfs4_stateid *local; 1608 __be32 status = nfserr_share_denied; 1609 struct nfs4_stateowner *sop = open->op_stateowner; 1610 1611 list_for_each_entry(local, &fp->fi_stateids, st_perfile) { 1612 /* ignore lock owners */ 1613 if (local->st_stateowner->so_is_open_owner == 0) 1614 continue; 1615 /* remember if we have seen this open owner */ 1616 if (local->st_stateowner == sop) 1617 *stpp = local; 1618 /* check for conflicting share reservations */ 1619 if (!test_share(local, open)) 1620 goto out; 1621 } 1622 status = 0; 1623 out: 1624 return status; 1625 } 1626 1627 static inline struct nfs4_stateid * 1628 nfs4_alloc_stateid(void) 1629 { 1630 return kmem_cache_alloc(stateid_slab, GFP_KERNEL); 1631 } 1632 1633 static __be32 1634 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, 1635 struct nfs4_delegation *dp, 1636 struct svc_fh *cur_fh, int flags) 1637 { 1638 struct nfs4_stateid *stp; 1639 1640 stp = nfs4_alloc_stateid(); 1641 if (stp == NULL) 1642 return nfserr_resource; 1643 1644 if (dp) { 1645 get_file(dp->dl_vfs_file); 1646 stp->st_vfs_file = dp->dl_vfs_file; 1647 } else { 1648 __be32 status; 1649 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, 1650 &stp->st_vfs_file); 1651 if (status) { 1652 if (status == nfserr_dropit) 1653 status = nfserr_jukebox; 1654 kmem_cache_free(stateid_slab, stp); 1655 return status; 1656 } 1657 } 1658 *stpp = stp; 1659 return 0; 1660 } 1661 1662 static inline __be32 1663 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 1664 struct nfsd4_open *open) 1665 { 1666 struct iattr iattr = { 1667 .ia_valid = ATTR_SIZE, 1668 .ia_size = 0, 1669 }; 1670 if (!open->op_truncate) 1671 return 0; 1672 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 1673 return nfserr_inval; 1674 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 1675 } 1676 1677 static __be32 1678 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) 1679 { 1680 struct file *filp = stp->st_vfs_file; 1681 struct inode *inode = filp->f_path.dentry->d_inode; 1682 unsigned int share_access, new_writer; 1683 __be32 status; 1684 1685 set_access(&share_access, stp->st_access_bmap); 1686 new_writer = (~share_access) & open->op_share_access 1687 & NFS4_SHARE_ACCESS_WRITE; 1688 1689 if (new_writer) { 1690 int err = get_write_access(inode); 1691 if (err) 1692 return nfserrno(err); 1693 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt); 1694 if (err) 1695 return nfserrno(err); 1696 file_take_write(filp); 1697 } 1698 status = nfsd4_truncate(rqstp, cur_fh, open); 1699 if (status) { 1700 if (new_writer) 1701 put_write_access(inode); 1702 return status; 1703 } 1704 /* remember the open */ 1705 filp->f_mode |= open->op_share_access; 1706 __set_bit(open->op_share_access, &stp->st_access_bmap); 1707 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1708 1709 return nfs_ok; 1710 } 1711 1712 1713 static void 1714 nfs4_set_claim_prev(struct nfsd4_open *open) 1715 { 1716 open->op_stateowner->so_confirmed = 1; 1717 open->op_stateowner->so_client->cl_firststate = 1; 1718 } 1719 1720 /* 1721 * Attempt to hand out a delegation. 1722 */ 1723 static void 1724 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp) 1725 { 1726 struct nfs4_delegation *dp; 1727 struct nfs4_stateowner *sop = stp->st_stateowner; 1728 struct nfs4_callback *cb = &sop->so_client->cl_callback; 1729 struct file_lock fl, *flp = &fl; 1730 int status, flag = 0; 1731 1732 flag = NFS4_OPEN_DELEGATE_NONE; 1733 open->op_recall = 0; 1734 switch (open->op_claim_type) { 1735 case NFS4_OPEN_CLAIM_PREVIOUS: 1736 if (!atomic_read(&cb->cb_set)) 1737 open->op_recall = 1; 1738 flag = open->op_delegate_type; 1739 if (flag == NFS4_OPEN_DELEGATE_NONE) 1740 goto out; 1741 break; 1742 case NFS4_OPEN_CLAIM_NULL: 1743 /* Let's not give out any delegations till everyone's 1744 * had the chance to reclaim theirs.... */ 1745 if (locks_in_grace()) 1746 goto out; 1747 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed) 1748 goto out; 1749 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1750 flag = NFS4_OPEN_DELEGATE_WRITE; 1751 else 1752 flag = NFS4_OPEN_DELEGATE_READ; 1753 break; 1754 default: 1755 goto out; 1756 } 1757 1758 dp = alloc_init_deleg(sop->so_client, stp, fh, flag); 1759 if (dp == NULL) { 1760 flag = NFS4_OPEN_DELEGATE_NONE; 1761 goto out; 1762 } 1763 locks_init_lock(&fl); 1764 fl.fl_lmops = &nfsd_lease_mng_ops; 1765 fl.fl_flags = FL_LEASE; 1766 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; 1767 fl.fl_end = OFFSET_MAX; 1768 fl.fl_owner = (fl_owner_t)dp; 1769 fl.fl_file = stp->st_vfs_file; 1770 fl.fl_pid = current->tgid; 1771 1772 /* vfs_setlease checks to see if delegation should be handed out. 1773 * the lock_manager callbacks fl_mylease and fl_change are used 1774 */ 1775 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) { 1776 dprintk("NFSD: setlease failed [%d], no delegation\n", status); 1777 unhash_delegation(dp); 1778 flag = NFS4_OPEN_DELEGATE_NONE; 1779 goto out; 1780 } 1781 1782 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); 1783 1784 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n", 1785 dp->dl_stateid.si_boot, 1786 dp->dl_stateid.si_stateownerid, 1787 dp->dl_stateid.si_fileid, 1788 dp->dl_stateid.si_generation); 1789 out: 1790 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS 1791 && flag == NFS4_OPEN_DELEGATE_NONE 1792 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) 1793 dprintk("NFSD: WARNING: refusing delegation reclaim\n"); 1794 open->op_delegate_type = flag; 1795 } 1796 1797 /* 1798 * called with nfs4_lock_state() held. 1799 */ 1800 __be32 1801 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 1802 { 1803 struct nfs4_file *fp = NULL; 1804 struct inode *ino = current_fh->fh_dentry->d_inode; 1805 struct nfs4_stateid *stp = NULL; 1806 struct nfs4_delegation *dp = NULL; 1807 __be32 status; 1808 1809 status = nfserr_inval; 1810 if (!access_valid(open->op_share_access) 1811 || !deny_valid(open->op_share_deny)) 1812 goto out; 1813 /* 1814 * Lookup file; if found, lookup stateid and check open request, 1815 * and check for delegations in the process of being recalled. 1816 * If not found, create the nfs4_file struct 1817 */ 1818 fp = find_file(ino); 1819 if (fp) { 1820 if ((status = nfs4_check_open(fp, open, &stp))) 1821 goto out; 1822 status = nfs4_check_deleg(fp, open, &dp); 1823 if (status) 1824 goto out; 1825 } else { 1826 status = nfserr_bad_stateid; 1827 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) 1828 goto out; 1829 status = nfserr_resource; 1830 fp = alloc_init_file(ino); 1831 if (fp == NULL) 1832 goto out; 1833 } 1834 1835 /* 1836 * OPEN the file, or upgrade an existing OPEN. 1837 * If truncate fails, the OPEN fails. 1838 */ 1839 if (stp) { 1840 /* Stateid was found, this is an OPEN upgrade */ 1841 status = nfs4_upgrade_open(rqstp, current_fh, stp, open); 1842 if (status) 1843 goto out; 1844 update_stateid(&stp->st_stateid); 1845 } else { 1846 /* Stateid was not found, this is a new OPEN */ 1847 int flags = 0; 1848 if (open->op_share_access & NFS4_SHARE_ACCESS_READ) 1849 flags |= NFSD_MAY_READ; 1850 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1851 flags |= NFSD_MAY_WRITE; 1852 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags); 1853 if (status) 1854 goto out; 1855 init_stateid(stp, fp, open); 1856 status = nfsd4_truncate(rqstp, current_fh, open); 1857 if (status) { 1858 release_open_stateid(stp); 1859 goto out; 1860 } 1861 } 1862 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 1863 1864 /* 1865 * Attempt to hand out a delegation. No error return, because the 1866 * OPEN succeeds even if we fail. 1867 */ 1868 nfs4_open_delegation(current_fh, open, stp); 1869 1870 status = nfs_ok; 1871 1872 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n", 1873 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid, 1874 stp->st_stateid.si_fileid, stp->st_stateid.si_generation); 1875 out: 1876 if (fp) 1877 put_nfs4_file(fp); 1878 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 1879 nfs4_set_claim_prev(open); 1880 /* 1881 * To finish the open response, we just need to set the rflags. 1882 */ 1883 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 1884 if (!open->op_stateowner->so_confirmed) 1885 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 1886 1887 return status; 1888 } 1889 1890 __be32 1891 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 1892 clientid_t *clid) 1893 { 1894 struct nfs4_client *clp; 1895 __be32 status; 1896 1897 nfs4_lock_state(); 1898 dprintk("process_renew(%08x/%08x): starting\n", 1899 clid->cl_boot, clid->cl_id); 1900 status = nfserr_stale_clientid; 1901 if (STALE_CLIENTID(clid)) 1902 goto out; 1903 clp = find_confirmed_client(clid); 1904 status = nfserr_expired; 1905 if (clp == NULL) { 1906 /* We assume the client took too long to RENEW. */ 1907 dprintk("nfsd4_renew: clientid not found!\n"); 1908 goto out; 1909 } 1910 renew_client(clp); 1911 status = nfserr_cb_path_down; 1912 if (!list_empty(&clp->cl_delegations) 1913 && !atomic_read(&clp->cl_callback.cb_set)) 1914 goto out; 1915 status = nfs_ok; 1916 out: 1917 nfs4_unlock_state(); 1918 return status; 1919 } 1920 1921 struct lock_manager nfsd4_manager = { 1922 }; 1923 1924 static void 1925 nfsd4_end_grace(void) 1926 { 1927 dprintk("NFSD: end of grace period\n"); 1928 nfsd4_recdir_purge_old(); 1929 locks_end_grace(&nfsd4_manager); 1930 } 1931 1932 static time_t 1933 nfs4_laundromat(void) 1934 { 1935 struct nfs4_client *clp; 1936 struct nfs4_stateowner *sop; 1937 struct nfs4_delegation *dp; 1938 struct list_head *pos, *next, reaplist; 1939 time_t cutoff = get_seconds() - NFSD_LEASE_TIME; 1940 time_t t, clientid_val = NFSD_LEASE_TIME; 1941 time_t u, test_val = NFSD_LEASE_TIME; 1942 1943 nfs4_lock_state(); 1944 1945 dprintk("NFSD: laundromat service - starting\n"); 1946 if (locks_in_grace()) 1947 nfsd4_end_grace(); 1948 list_for_each_safe(pos, next, &client_lru) { 1949 clp = list_entry(pos, struct nfs4_client, cl_lru); 1950 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 1951 t = clp->cl_time - cutoff; 1952 if (clientid_val > t) 1953 clientid_val = t; 1954 break; 1955 } 1956 dprintk("NFSD: purging unused client (clientid %08x)\n", 1957 clp->cl_clientid.cl_id); 1958 nfsd4_remove_clid_dir(clp); 1959 expire_client(clp); 1960 } 1961 INIT_LIST_HEAD(&reaplist); 1962 spin_lock(&recall_lock); 1963 list_for_each_safe(pos, next, &del_recall_lru) { 1964 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1965 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 1966 u = dp->dl_time - cutoff; 1967 if (test_val > u) 1968 test_val = u; 1969 break; 1970 } 1971 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 1972 dp, dp->dl_flock); 1973 list_move(&dp->dl_recall_lru, &reaplist); 1974 } 1975 spin_unlock(&recall_lock); 1976 list_for_each_safe(pos, next, &reaplist) { 1977 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1978 list_del_init(&dp->dl_recall_lru); 1979 unhash_delegation(dp); 1980 } 1981 test_val = NFSD_LEASE_TIME; 1982 list_for_each_safe(pos, next, &close_lru) { 1983 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 1984 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 1985 u = sop->so_time - cutoff; 1986 if (test_val > u) 1987 test_val = u; 1988 break; 1989 } 1990 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 1991 sop->so_id); 1992 release_openowner(sop); 1993 } 1994 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 1995 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 1996 nfs4_unlock_state(); 1997 return clientid_val; 1998 } 1999 2000 static struct workqueue_struct *laundry_wq; 2001 static void laundromat_main(struct work_struct *); 2002 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); 2003 2004 static void 2005 laundromat_main(struct work_struct *not_used) 2006 { 2007 time_t t; 2008 2009 t = nfs4_laundromat(); 2010 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 2011 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); 2012 } 2013 2014 static struct nfs4_stateowner * 2015 search_close_lru(u32 st_id, int flags) 2016 { 2017 struct nfs4_stateowner *local = NULL; 2018 2019 if (flags & CLOSE_STATE) { 2020 list_for_each_entry(local, &close_lru, so_close_lru) { 2021 if (local->so_id == st_id) 2022 return local; 2023 } 2024 } 2025 return NULL; 2026 } 2027 2028 static inline int 2029 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 2030 { 2031 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode; 2032 } 2033 2034 static int 2035 STALE_STATEID(stateid_t *stateid) 2036 { 2037 if (stateid->si_boot == boot_time) 2038 return 0; 2039 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n", 2040 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 2041 stateid->si_generation); 2042 return 1; 2043 } 2044 2045 static inline int 2046 access_permit_read(unsigned long access_bmap) 2047 { 2048 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 2049 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 2050 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 2051 } 2052 2053 static inline int 2054 access_permit_write(unsigned long access_bmap) 2055 { 2056 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 2057 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 2058 } 2059 2060 static 2061 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 2062 { 2063 __be32 status = nfserr_openmode; 2064 2065 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 2066 goto out; 2067 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 2068 goto out; 2069 status = nfs_ok; 2070 out: 2071 return status; 2072 } 2073 2074 static inline __be32 2075 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 2076 { 2077 if (ONE_STATEID(stateid) && (flags & RD_STATE)) 2078 return nfs_ok; 2079 else if (locks_in_grace()) { 2080 /* Answer in remaining cases depends on existance of 2081 * conflicting state; so we must wait out the grace period. */ 2082 return nfserr_grace; 2083 } else if (flags & WR_STATE) 2084 return nfs4_share_conflict(current_fh, 2085 NFS4_SHARE_DENY_WRITE); 2086 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 2087 return nfs4_share_conflict(current_fh, 2088 NFS4_SHARE_DENY_READ); 2089 } 2090 2091 /* 2092 * Allow READ/WRITE during grace period on recovered state only for files 2093 * that are not able to provide mandatory locking. 2094 */ 2095 static inline int 2096 grace_disallows_io(struct inode *inode) 2097 { 2098 return locks_in_grace() && mandatory_lock(inode); 2099 } 2100 2101 static int check_stateid_generation(stateid_t *in, stateid_t *ref) 2102 { 2103 /* If the client sends us a stateid from the future, it's buggy: */ 2104 if (in->si_generation > ref->si_generation) 2105 return nfserr_bad_stateid; 2106 /* 2107 * The following, however, can happen. For example, if the 2108 * client sends an open and some IO at the same time, the open 2109 * may bump si_generation while the IO is still in flight. 2110 * Thanks to hard links and renames, the client never knows what 2111 * file an open will affect. So it could avoid that situation 2112 * only by serializing all opens and IO from the same open 2113 * owner. To recover from the old_stateid error, the client 2114 * will just have to retry the IO: 2115 */ 2116 if (in->si_generation < ref->si_generation) 2117 return nfserr_old_stateid; 2118 return nfs_ok; 2119 } 2120 2121 static int is_delegation_stateid(stateid_t *stateid) 2122 { 2123 return stateid->si_fileid == 0; 2124 } 2125 2126 /* 2127 * Checks for stateid operations 2128 */ 2129 __be32 2130 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp) 2131 { 2132 struct nfs4_stateid *stp = NULL; 2133 struct nfs4_delegation *dp = NULL; 2134 struct inode *ino = current_fh->fh_dentry->d_inode; 2135 __be32 status; 2136 2137 if (filpp) 2138 *filpp = NULL; 2139 2140 if (grace_disallows_io(ino)) 2141 return nfserr_grace; 2142 2143 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2144 return check_special_stateids(current_fh, stateid, flags); 2145 2146 status = nfserr_stale_stateid; 2147 if (STALE_STATEID(stateid)) 2148 goto out; 2149 2150 status = nfserr_bad_stateid; 2151 if (is_delegation_stateid(stateid)) { 2152 dp = find_delegation_stateid(ino, stateid); 2153 if (!dp) 2154 goto out; 2155 status = check_stateid_generation(stateid, &dp->dl_stateid); 2156 if (status) 2157 goto out; 2158 status = nfs4_check_delegmode(dp, flags); 2159 if (status) 2160 goto out; 2161 renew_client(dp->dl_client); 2162 if (filpp) 2163 *filpp = dp->dl_vfs_file; 2164 } else { /* open or lock stateid */ 2165 stp = find_stateid(stateid, flags); 2166 if (!stp) 2167 goto out; 2168 if (nfs4_check_fh(current_fh, stp)) 2169 goto out; 2170 if (!stp->st_stateowner->so_confirmed) 2171 goto out; 2172 status = check_stateid_generation(stateid, &stp->st_stateid); 2173 if (status) 2174 goto out; 2175 status = nfs4_check_openmode(stp, flags); 2176 if (status) 2177 goto out; 2178 renew_client(stp->st_stateowner->so_client); 2179 if (filpp) 2180 *filpp = stp->st_vfs_file; 2181 } 2182 status = nfs_ok; 2183 out: 2184 return status; 2185 } 2186 2187 static inline int 2188 setlkflg (int type) 2189 { 2190 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 2191 RD_STATE : WR_STATE; 2192 } 2193 2194 /* 2195 * Checks for sequence id mutating operations. 2196 */ 2197 static __be32 2198 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) 2199 { 2200 struct nfs4_stateid *stp; 2201 struct nfs4_stateowner *sop; 2202 __be32 status; 2203 2204 dprintk("NFSD: preprocess_seqid_op: seqid=%d " 2205 "stateid = (%08x/%08x/%08x/%08x)\n", seqid, 2206 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 2207 stateid->si_generation); 2208 2209 *stpp = NULL; 2210 *sopp = NULL; 2211 2212 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 2213 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n"); 2214 return nfserr_bad_stateid; 2215 } 2216 2217 if (STALE_STATEID(stateid)) 2218 return nfserr_stale_stateid; 2219 /* 2220 * We return BAD_STATEID if filehandle doesn't match stateid, 2221 * the confirmed flag is incorrecly set, or the generation 2222 * number is incorrect. 2223 */ 2224 stp = find_stateid(stateid, flags); 2225 if (stp == NULL) { 2226 /* 2227 * Also, we should make sure this isn't just the result of 2228 * a replayed close: 2229 */ 2230 sop = search_close_lru(stateid->si_stateownerid, flags); 2231 if (sop == NULL) 2232 return nfserr_bad_stateid; 2233 *sopp = sop; 2234 goto check_replay; 2235 } 2236 2237 *stpp = stp; 2238 *sopp = sop = stp->st_stateowner; 2239 2240 if (lock) { 2241 clientid_t *lockclid = &lock->v.new.clientid; 2242 struct nfs4_client *clp = sop->so_client; 2243 int lkflg = 0; 2244 __be32 status; 2245 2246 lkflg = setlkflg(lock->lk_type); 2247 2248 if (lock->lk_is_new) { 2249 if (!sop->so_is_open_owner) 2250 return nfserr_bad_stateid; 2251 if (!same_clid(&clp->cl_clientid, lockclid)) 2252 return nfserr_bad_stateid; 2253 /* stp is the open stateid */ 2254 status = nfs4_check_openmode(stp, lkflg); 2255 if (status) 2256 return status; 2257 } else { 2258 /* stp is the lock stateid */ 2259 status = nfs4_check_openmode(stp->st_openstp, lkflg); 2260 if (status) 2261 return status; 2262 } 2263 } 2264 2265 if (nfs4_check_fh(current_fh, stp)) { 2266 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 2267 return nfserr_bad_stateid; 2268 } 2269 2270 /* 2271 * We now validate the seqid and stateid generation numbers. 2272 * For the moment, we ignore the possibility of 2273 * generation number wraparound. 2274 */ 2275 if (seqid != sop->so_seqid) 2276 goto check_replay; 2277 2278 if (sop->so_confirmed && flags & CONFIRM) { 2279 dprintk("NFSD: preprocess_seqid_op: expected" 2280 " unconfirmed stateowner!\n"); 2281 return nfserr_bad_stateid; 2282 } 2283 if (!sop->so_confirmed && !(flags & CONFIRM)) { 2284 dprintk("NFSD: preprocess_seqid_op: stateowner not" 2285 " confirmed yet!\n"); 2286 return nfserr_bad_stateid; 2287 } 2288 status = check_stateid_generation(stateid, &stp->st_stateid); 2289 if (status) 2290 return status; 2291 renew_client(sop->so_client); 2292 return nfs_ok; 2293 2294 check_replay: 2295 if (seqid == sop->so_seqid - 1) { 2296 dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); 2297 /* indicate replay to calling function */ 2298 return nfserr_replay_me; 2299 } 2300 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", 2301 sop->so_seqid, seqid); 2302 *sopp = NULL; 2303 return nfserr_bad_seqid; 2304 } 2305 2306 __be32 2307 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2308 struct nfsd4_open_confirm *oc) 2309 { 2310 __be32 status; 2311 struct nfs4_stateowner *sop; 2312 struct nfs4_stateid *stp; 2313 2314 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 2315 (int)cstate->current_fh.fh_dentry->d_name.len, 2316 cstate->current_fh.fh_dentry->d_name.name); 2317 2318 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); 2319 if (status) 2320 return status; 2321 2322 nfs4_lock_state(); 2323 2324 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2325 oc->oc_seqid, &oc->oc_req_stateid, 2326 CONFIRM | OPEN_STATE, 2327 &oc->oc_stateowner, &stp, NULL))) 2328 goto out; 2329 2330 sop = oc->oc_stateowner; 2331 sop->so_confirmed = 1; 2332 update_stateid(&stp->st_stateid); 2333 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 2334 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 2335 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid, 2336 stp->st_stateid.si_boot, 2337 stp->st_stateid.si_stateownerid, 2338 stp->st_stateid.si_fileid, 2339 stp->st_stateid.si_generation); 2340 2341 nfsd4_create_clid_dir(sop->so_client); 2342 out: 2343 if (oc->oc_stateowner) { 2344 nfs4_get_stateowner(oc->oc_stateowner); 2345 cstate->replay_owner = oc->oc_stateowner; 2346 } 2347 nfs4_unlock_state(); 2348 return status; 2349 } 2350 2351 2352 /* 2353 * unset all bits in union bitmap (bmap) that 2354 * do not exist in share (from successful OPEN_DOWNGRADE) 2355 */ 2356 static void 2357 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 2358 { 2359 int i; 2360 for (i = 1; i < 4; i++) { 2361 if ((i & access) != i) 2362 __clear_bit(i, bmap); 2363 } 2364 } 2365 2366 static void 2367 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 2368 { 2369 int i; 2370 for (i = 0; i < 4; i++) { 2371 if ((i & deny) != i) 2372 __clear_bit(i, bmap); 2373 } 2374 } 2375 2376 __be32 2377 nfsd4_open_downgrade(struct svc_rqst *rqstp, 2378 struct nfsd4_compound_state *cstate, 2379 struct nfsd4_open_downgrade *od) 2380 { 2381 __be32 status; 2382 struct nfs4_stateid *stp; 2383 unsigned int share_access; 2384 2385 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 2386 (int)cstate->current_fh.fh_dentry->d_name.len, 2387 cstate->current_fh.fh_dentry->d_name.name); 2388 2389 if (!access_valid(od->od_share_access) 2390 || !deny_valid(od->od_share_deny)) 2391 return nfserr_inval; 2392 2393 nfs4_lock_state(); 2394 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2395 od->od_seqid, 2396 &od->od_stateid, 2397 OPEN_STATE, 2398 &od->od_stateowner, &stp, NULL))) 2399 goto out; 2400 2401 status = nfserr_inval; 2402 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 2403 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 2404 stp->st_access_bmap, od->od_share_access); 2405 goto out; 2406 } 2407 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 2408 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 2409 stp->st_deny_bmap, od->od_share_deny); 2410 goto out; 2411 } 2412 set_access(&share_access, stp->st_access_bmap); 2413 nfs4_file_downgrade(stp->st_vfs_file, 2414 share_access & ~od->od_share_access); 2415 2416 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 2417 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 2418 2419 update_stateid(&stp->st_stateid); 2420 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 2421 status = nfs_ok; 2422 out: 2423 if (od->od_stateowner) { 2424 nfs4_get_stateowner(od->od_stateowner); 2425 cstate->replay_owner = od->od_stateowner; 2426 } 2427 nfs4_unlock_state(); 2428 return status; 2429 } 2430 2431 /* 2432 * nfs4_unlock_state() called after encode 2433 */ 2434 __be32 2435 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2436 struct nfsd4_close *close) 2437 { 2438 __be32 status; 2439 struct nfs4_stateid *stp; 2440 2441 dprintk("NFSD: nfsd4_close on file %.*s\n", 2442 (int)cstate->current_fh.fh_dentry->d_name.len, 2443 cstate->current_fh.fh_dentry->d_name.name); 2444 2445 nfs4_lock_state(); 2446 /* check close_lru for replay */ 2447 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2448 close->cl_seqid, 2449 &close->cl_stateid, 2450 OPEN_STATE | CLOSE_STATE, 2451 &close->cl_stateowner, &stp, NULL))) 2452 goto out; 2453 status = nfs_ok; 2454 update_stateid(&stp->st_stateid); 2455 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 2456 2457 /* release_stateid() calls nfsd_close() if needed */ 2458 release_open_stateid(stp); 2459 2460 /* place unused nfs4_stateowners on so_close_lru list to be 2461 * released by the laundromat service after the lease period 2462 * to enable us to handle CLOSE replay 2463 */ 2464 if (list_empty(&close->cl_stateowner->so_stateids)) 2465 move_to_close_lru(close->cl_stateowner); 2466 out: 2467 if (close->cl_stateowner) { 2468 nfs4_get_stateowner(close->cl_stateowner); 2469 cstate->replay_owner = close->cl_stateowner; 2470 } 2471 nfs4_unlock_state(); 2472 return status; 2473 } 2474 2475 __be32 2476 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2477 struct nfsd4_delegreturn *dr) 2478 { 2479 struct nfs4_delegation *dp; 2480 stateid_t *stateid = &dr->dr_stateid; 2481 struct inode *inode; 2482 __be32 status; 2483 2484 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 2485 return status; 2486 inode = cstate->current_fh.fh_dentry->d_inode; 2487 2488 nfs4_lock_state(); 2489 status = nfserr_bad_stateid; 2490 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2491 goto out; 2492 status = nfserr_stale_stateid; 2493 if (STALE_STATEID(stateid)) 2494 goto out; 2495 status = nfserr_bad_stateid; 2496 if (!is_delegation_stateid(stateid)) 2497 goto out; 2498 dp = find_delegation_stateid(inode, stateid); 2499 if (!dp) 2500 goto out; 2501 status = check_stateid_generation(stateid, &dp->dl_stateid); 2502 if (status) 2503 goto out; 2504 renew_client(dp->dl_client); 2505 2506 unhash_delegation(dp); 2507 out: 2508 nfs4_unlock_state(); 2509 2510 return status; 2511 } 2512 2513 2514 /* 2515 * Lock owner state (byte-range locks) 2516 */ 2517 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 2518 #define LOCK_HASH_BITS 8 2519 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 2520 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 2521 2522 static inline u64 2523 end_offset(u64 start, u64 len) 2524 { 2525 u64 end; 2526 2527 end = start + len; 2528 return end >= start ? end: NFS4_MAX_UINT64; 2529 } 2530 2531 /* last octet in a range */ 2532 static inline u64 2533 last_byte_offset(u64 start, u64 len) 2534 { 2535 u64 end; 2536 2537 BUG_ON(!len); 2538 end = start + len; 2539 return end > start ? end - 1: NFS4_MAX_UINT64; 2540 } 2541 2542 #define lockownerid_hashval(id) \ 2543 ((id) & LOCK_HASH_MASK) 2544 2545 static inline unsigned int 2546 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 2547 struct xdr_netobj *ownername) 2548 { 2549 return (file_hashval(inode) + cl_id 2550 + opaque_hashval(ownername->data, ownername->len)) 2551 & LOCK_HASH_MASK; 2552 } 2553 2554 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 2555 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 2556 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 2557 2558 static struct nfs4_stateid * 2559 find_stateid(stateid_t *stid, int flags) 2560 { 2561 struct nfs4_stateid *local; 2562 u32 st_id = stid->si_stateownerid; 2563 u32 f_id = stid->si_fileid; 2564 unsigned int hashval; 2565 2566 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 2567 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) { 2568 hashval = stateid_hashval(st_id, f_id); 2569 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 2570 if ((local->st_stateid.si_stateownerid == st_id) && 2571 (local->st_stateid.si_fileid == f_id)) 2572 return local; 2573 } 2574 } 2575 2576 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) { 2577 hashval = stateid_hashval(st_id, f_id); 2578 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 2579 if ((local->st_stateid.si_stateownerid == st_id) && 2580 (local->st_stateid.si_fileid == f_id)) 2581 return local; 2582 } 2583 } 2584 return NULL; 2585 } 2586 2587 static struct nfs4_delegation * 2588 find_delegation_stateid(struct inode *ino, stateid_t *stid) 2589 { 2590 struct nfs4_file *fp; 2591 struct nfs4_delegation *dl; 2592 2593 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n", 2594 stid->si_boot, stid->si_stateownerid, 2595 stid->si_fileid, stid->si_generation); 2596 2597 fp = find_file(ino); 2598 if (!fp) 2599 return NULL; 2600 dl = find_delegation_file(fp, stid); 2601 put_nfs4_file(fp); 2602 return dl; 2603 } 2604 2605 /* 2606 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 2607 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 2608 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 2609 * locking, this prevents us from being completely protocol-compliant. The 2610 * real solution to this problem is to start using unsigned file offsets in 2611 * the VFS, but this is a very deep change! 2612 */ 2613 static inline void 2614 nfs4_transform_lock_offset(struct file_lock *lock) 2615 { 2616 if (lock->fl_start < 0) 2617 lock->fl_start = OFFSET_MAX; 2618 if (lock->fl_end < 0) 2619 lock->fl_end = OFFSET_MAX; 2620 } 2621 2622 /* Hack!: For now, we're defining this just so we can use a pointer to it 2623 * as a unique cookie to identify our (NFSv4's) posix locks. */ 2624 static struct lock_manager_operations nfsd_posix_mng_ops = { 2625 }; 2626 2627 static inline void 2628 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 2629 { 2630 struct nfs4_stateowner *sop; 2631 unsigned int hval; 2632 2633 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 2634 sop = (struct nfs4_stateowner *) fl->fl_owner; 2635 hval = lockownerid_hashval(sop->so_id); 2636 kref_get(&sop->so_ref); 2637 deny->ld_sop = sop; 2638 deny->ld_clientid = sop->so_client->cl_clientid; 2639 } else { 2640 deny->ld_sop = NULL; 2641 deny->ld_clientid.cl_boot = 0; 2642 deny->ld_clientid.cl_id = 0; 2643 } 2644 deny->ld_start = fl->fl_start; 2645 deny->ld_length = NFS4_MAX_UINT64; 2646 if (fl->fl_end != NFS4_MAX_UINT64) 2647 deny->ld_length = fl->fl_end - fl->fl_start + 1; 2648 deny->ld_type = NFS4_READ_LT; 2649 if (fl->fl_type != F_RDLCK) 2650 deny->ld_type = NFS4_WRITE_LT; 2651 } 2652 2653 static struct nfs4_stateowner * 2654 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 2655 struct xdr_netobj *owner) 2656 { 2657 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 2658 struct nfs4_stateowner *op; 2659 2660 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 2661 if (same_owner_str(op, owner, clid)) 2662 return op; 2663 } 2664 return NULL; 2665 } 2666 2667 /* 2668 * Alloc a lock owner structure. 2669 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 2670 * occured. 2671 * 2672 * strhashval = lock_ownerstr_hashval 2673 */ 2674 2675 static struct nfs4_stateowner * 2676 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 2677 struct nfs4_stateowner *sop; 2678 struct nfs4_replay *rp; 2679 unsigned int idhashval; 2680 2681 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 2682 return NULL; 2683 idhashval = lockownerid_hashval(current_ownerid); 2684 INIT_LIST_HEAD(&sop->so_idhash); 2685 INIT_LIST_HEAD(&sop->so_strhash); 2686 INIT_LIST_HEAD(&sop->so_perclient); 2687 INIT_LIST_HEAD(&sop->so_stateids); 2688 INIT_LIST_HEAD(&sop->so_perstateid); 2689 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 2690 sop->so_time = 0; 2691 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 2692 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 2693 list_add(&sop->so_perstateid, &open_stp->st_lockowners); 2694 sop->so_is_open_owner = 0; 2695 sop->so_id = current_ownerid++; 2696 sop->so_client = clp; 2697 /* It is the openowner seqid that will be incremented in encode in the 2698 * case of new lockowners; so increment the lock seqid manually: */ 2699 sop->so_seqid = lock->lk_new_lock_seqid + 1; 2700 sop->so_confirmed = 1; 2701 rp = &sop->so_replay; 2702 rp->rp_status = nfserr_serverfault; 2703 rp->rp_buflen = 0; 2704 rp->rp_buf = rp->rp_ibuf; 2705 return sop; 2706 } 2707 2708 static struct nfs4_stateid * 2709 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 2710 { 2711 struct nfs4_stateid *stp; 2712 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 2713 2714 stp = nfs4_alloc_stateid(); 2715 if (stp == NULL) 2716 goto out; 2717 INIT_LIST_HEAD(&stp->st_hash); 2718 INIT_LIST_HEAD(&stp->st_perfile); 2719 INIT_LIST_HEAD(&stp->st_perstateowner); 2720 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ 2721 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 2722 list_add(&stp->st_perfile, &fp->fi_stateids); 2723 list_add(&stp->st_perstateowner, &sop->so_stateids); 2724 stp->st_stateowner = sop; 2725 get_nfs4_file(fp); 2726 stp->st_file = fp; 2727 stp->st_stateid.si_boot = boot_time; 2728 stp->st_stateid.si_stateownerid = sop->so_id; 2729 stp->st_stateid.si_fileid = fp->fi_id; 2730 stp->st_stateid.si_generation = 0; 2731 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */ 2732 stp->st_access_bmap = open_stp->st_access_bmap; 2733 stp->st_deny_bmap = open_stp->st_deny_bmap; 2734 stp->st_openstp = open_stp; 2735 2736 out: 2737 return stp; 2738 } 2739 2740 static int 2741 check_lock_length(u64 offset, u64 length) 2742 { 2743 return ((length == 0) || ((length != NFS4_MAX_UINT64) && 2744 LOFF_OVERFLOW(offset, length))); 2745 } 2746 2747 /* 2748 * LOCK operation 2749 */ 2750 __be32 2751 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2752 struct nfsd4_lock *lock) 2753 { 2754 struct nfs4_stateowner *open_sop = NULL; 2755 struct nfs4_stateowner *lock_sop = NULL; 2756 struct nfs4_stateid *lock_stp; 2757 struct file *filp; 2758 struct file_lock file_lock; 2759 struct file_lock conflock; 2760 __be32 status = 0; 2761 unsigned int strhashval; 2762 unsigned int cmd; 2763 int err; 2764 2765 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 2766 (long long) lock->lk_offset, 2767 (long long) lock->lk_length); 2768 2769 if (check_lock_length(lock->lk_offset, lock->lk_length)) 2770 return nfserr_inval; 2771 2772 if ((status = fh_verify(rqstp, &cstate->current_fh, 2773 S_IFREG, NFSD_MAY_LOCK))) { 2774 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 2775 return status; 2776 } 2777 2778 nfs4_lock_state(); 2779 2780 if (lock->lk_is_new) { 2781 /* 2782 * Client indicates that this is a new lockowner. 2783 * Use open owner and open stateid to create lock owner and 2784 * lock stateid. 2785 */ 2786 struct nfs4_stateid *open_stp = NULL; 2787 struct nfs4_file *fp; 2788 2789 status = nfserr_stale_clientid; 2790 if (STALE_CLIENTID(&lock->lk_new_clientid)) 2791 goto out; 2792 2793 /* validate and update open stateid and open seqid */ 2794 status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2795 lock->lk_new_open_seqid, 2796 &lock->lk_new_open_stateid, 2797 OPEN_STATE, 2798 &lock->lk_replay_owner, &open_stp, 2799 lock); 2800 if (status) 2801 goto out; 2802 open_sop = lock->lk_replay_owner; 2803 /* create lockowner and lock stateid */ 2804 fp = open_stp->st_file; 2805 strhashval = lock_ownerstr_hashval(fp->fi_inode, 2806 open_sop->so_client->cl_clientid.cl_id, 2807 &lock->v.new.owner); 2808 /* XXX: Do we need to check for duplicate stateowners on 2809 * the same file, or should they just be allowed (and 2810 * create new stateids)? */ 2811 status = nfserr_resource; 2812 lock_sop = alloc_init_lock_stateowner(strhashval, 2813 open_sop->so_client, open_stp, lock); 2814 if (lock_sop == NULL) 2815 goto out; 2816 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); 2817 if (lock_stp == NULL) 2818 goto out; 2819 } else { 2820 /* lock (lock owner + lock stateid) already exists */ 2821 status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2822 lock->lk_old_lock_seqid, 2823 &lock->lk_old_lock_stateid, 2824 LOCK_STATE, 2825 &lock->lk_replay_owner, &lock_stp, lock); 2826 if (status) 2827 goto out; 2828 lock_sop = lock->lk_replay_owner; 2829 } 2830 /* lock->lk_replay_owner and lock_stp have been created or found */ 2831 filp = lock_stp->st_vfs_file; 2832 2833 status = nfserr_grace; 2834 if (locks_in_grace() && !lock->lk_reclaim) 2835 goto out; 2836 status = nfserr_no_grace; 2837 if (!locks_in_grace() && lock->lk_reclaim) 2838 goto out; 2839 2840 locks_init_lock(&file_lock); 2841 switch (lock->lk_type) { 2842 case NFS4_READ_LT: 2843 case NFS4_READW_LT: 2844 file_lock.fl_type = F_RDLCK; 2845 cmd = F_SETLK; 2846 break; 2847 case NFS4_WRITE_LT: 2848 case NFS4_WRITEW_LT: 2849 file_lock.fl_type = F_WRLCK; 2850 cmd = F_SETLK; 2851 break; 2852 default: 2853 status = nfserr_inval; 2854 goto out; 2855 } 2856 file_lock.fl_owner = (fl_owner_t)lock_sop; 2857 file_lock.fl_pid = current->tgid; 2858 file_lock.fl_file = filp; 2859 file_lock.fl_flags = FL_POSIX; 2860 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2861 2862 file_lock.fl_start = lock->lk_offset; 2863 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); 2864 nfs4_transform_lock_offset(&file_lock); 2865 2866 /* 2867 * Try to lock the file in the VFS. 2868 * Note: locks.c uses the BKL to protect the inode's lock list. 2869 */ 2870 2871 err = vfs_lock_file(filp, cmd, &file_lock, &conflock); 2872 switch (-err) { 2873 case 0: /* success! */ 2874 update_stateid(&lock_stp->st_stateid); 2875 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 2876 sizeof(stateid_t)); 2877 status = 0; 2878 break; 2879 case (EAGAIN): /* conflock holds conflicting lock */ 2880 status = nfserr_denied; 2881 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 2882 nfs4_set_lock_denied(&conflock, &lock->lk_denied); 2883 break; 2884 case (EDEADLK): 2885 status = nfserr_deadlock; 2886 break; 2887 default: 2888 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); 2889 status = nfserr_resource; 2890 break; 2891 } 2892 out: 2893 if (status && lock->lk_is_new && lock_sop) 2894 release_lockowner(lock_sop); 2895 if (lock->lk_replay_owner) { 2896 nfs4_get_stateowner(lock->lk_replay_owner); 2897 cstate->replay_owner = lock->lk_replay_owner; 2898 } 2899 nfs4_unlock_state(); 2900 return status; 2901 } 2902 2903 /* 2904 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, 2905 * so we do a temporary open here just to get an open file to pass to 2906 * vfs_test_lock. (Arguably perhaps test_lock should be done with an 2907 * inode operation.) 2908 */ 2909 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) 2910 { 2911 struct file *file; 2912 int err; 2913 2914 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 2915 if (err) 2916 return err; 2917 err = vfs_test_lock(file, lock); 2918 nfsd_close(file); 2919 return err; 2920 } 2921 2922 /* 2923 * LOCKT operation 2924 */ 2925 __be32 2926 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2927 struct nfsd4_lockt *lockt) 2928 { 2929 struct inode *inode; 2930 struct file_lock file_lock; 2931 int error; 2932 __be32 status; 2933 2934 if (locks_in_grace()) 2935 return nfserr_grace; 2936 2937 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 2938 return nfserr_inval; 2939 2940 lockt->lt_stateowner = NULL; 2941 nfs4_lock_state(); 2942 2943 status = nfserr_stale_clientid; 2944 if (STALE_CLIENTID(&lockt->lt_clientid)) 2945 goto out; 2946 2947 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) { 2948 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 2949 if (status == nfserr_symlink) 2950 status = nfserr_inval; 2951 goto out; 2952 } 2953 2954 inode = cstate->current_fh.fh_dentry->d_inode; 2955 locks_init_lock(&file_lock); 2956 switch (lockt->lt_type) { 2957 case NFS4_READ_LT: 2958 case NFS4_READW_LT: 2959 file_lock.fl_type = F_RDLCK; 2960 break; 2961 case NFS4_WRITE_LT: 2962 case NFS4_WRITEW_LT: 2963 file_lock.fl_type = F_WRLCK; 2964 break; 2965 default: 2966 dprintk("NFSD: nfs4_lockt: bad lock type!\n"); 2967 status = nfserr_inval; 2968 goto out; 2969 } 2970 2971 lockt->lt_stateowner = find_lockstateowner_str(inode, 2972 &lockt->lt_clientid, &lockt->lt_owner); 2973 if (lockt->lt_stateowner) 2974 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 2975 file_lock.fl_pid = current->tgid; 2976 file_lock.fl_flags = FL_POSIX; 2977 2978 file_lock.fl_start = lockt->lt_offset; 2979 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); 2980 2981 nfs4_transform_lock_offset(&file_lock); 2982 2983 status = nfs_ok; 2984 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock); 2985 if (error) { 2986 status = nfserrno(error); 2987 goto out; 2988 } 2989 if (file_lock.fl_type != F_UNLCK) { 2990 status = nfserr_denied; 2991 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); 2992 } 2993 out: 2994 nfs4_unlock_state(); 2995 return status; 2996 } 2997 2998 __be32 2999 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3000 struct nfsd4_locku *locku) 3001 { 3002 struct nfs4_stateid *stp; 3003 struct file *filp = NULL; 3004 struct file_lock file_lock; 3005 __be32 status; 3006 int err; 3007 3008 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 3009 (long long) locku->lu_offset, 3010 (long long) locku->lu_length); 3011 3012 if (check_lock_length(locku->lu_offset, locku->lu_length)) 3013 return nfserr_inval; 3014 3015 nfs4_lock_state(); 3016 3017 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 3018 locku->lu_seqid, 3019 &locku->lu_stateid, 3020 LOCK_STATE, 3021 &locku->lu_stateowner, &stp, NULL))) 3022 goto out; 3023 3024 filp = stp->st_vfs_file; 3025 BUG_ON(!filp); 3026 locks_init_lock(&file_lock); 3027 file_lock.fl_type = F_UNLCK; 3028 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 3029 file_lock.fl_pid = current->tgid; 3030 file_lock.fl_file = filp; 3031 file_lock.fl_flags = FL_POSIX; 3032 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3033 file_lock.fl_start = locku->lu_offset; 3034 3035 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length); 3036 nfs4_transform_lock_offset(&file_lock); 3037 3038 /* 3039 * Try to unlock the file in the VFS. 3040 */ 3041 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); 3042 if (err) { 3043 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); 3044 goto out_nfserr; 3045 } 3046 /* 3047 * OK, unlock succeeded; the only thing left to do is update the stateid. 3048 */ 3049 update_stateid(&stp->st_stateid); 3050 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 3051 3052 out: 3053 if (locku->lu_stateowner) { 3054 nfs4_get_stateowner(locku->lu_stateowner); 3055 cstate->replay_owner = locku->lu_stateowner; 3056 } 3057 nfs4_unlock_state(); 3058 return status; 3059 3060 out_nfserr: 3061 status = nfserrno(err); 3062 goto out; 3063 } 3064 3065 /* 3066 * returns 3067 * 1: locks held by lockowner 3068 * 0: no locks held by lockowner 3069 */ 3070 static int 3071 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner) 3072 { 3073 struct file_lock **flpp; 3074 struct inode *inode = filp->f_path.dentry->d_inode; 3075 int status = 0; 3076 3077 lock_kernel(); 3078 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 3079 if ((*flpp)->fl_owner == (fl_owner_t)lowner) { 3080 status = 1; 3081 goto out; 3082 } 3083 } 3084 out: 3085 unlock_kernel(); 3086 return status; 3087 } 3088 3089 __be32 3090 nfsd4_release_lockowner(struct svc_rqst *rqstp, 3091 struct nfsd4_compound_state *cstate, 3092 struct nfsd4_release_lockowner *rlockowner) 3093 { 3094 clientid_t *clid = &rlockowner->rl_clientid; 3095 struct nfs4_stateowner *sop; 3096 struct nfs4_stateid *stp; 3097 struct xdr_netobj *owner = &rlockowner->rl_owner; 3098 struct list_head matches; 3099 int i; 3100 __be32 status; 3101 3102 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 3103 clid->cl_boot, clid->cl_id); 3104 3105 /* XXX check for lease expiration */ 3106 3107 status = nfserr_stale_clientid; 3108 if (STALE_CLIENTID(clid)) 3109 return status; 3110 3111 nfs4_lock_state(); 3112 3113 status = nfserr_locks_held; 3114 /* XXX: we're doing a linear search through all the lockowners. 3115 * Yipes! For now we'll just hope clients aren't really using 3116 * release_lockowner much, but eventually we have to fix these 3117 * data structures. */ 3118 INIT_LIST_HEAD(&matches); 3119 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3120 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { 3121 if (!same_owner_str(sop, owner, clid)) 3122 continue; 3123 list_for_each_entry(stp, &sop->so_stateids, 3124 st_perstateowner) { 3125 if (check_for_locks(stp->st_vfs_file, sop)) 3126 goto out; 3127 /* Note: so_perclient unused for lockowners, 3128 * so it's OK to fool with here. */ 3129 list_add(&sop->so_perclient, &matches); 3130 } 3131 } 3132 } 3133 /* Clients probably won't expect us to return with some (but not all) 3134 * of the lockowner state released; so don't release any until all 3135 * have been checked. */ 3136 status = nfs_ok; 3137 while (!list_empty(&matches)) { 3138 sop = list_entry(matches.next, struct nfs4_stateowner, 3139 so_perclient); 3140 /* unhash_stateowner deletes so_perclient only 3141 * for openowners. */ 3142 list_del(&sop->so_perclient); 3143 release_lockowner(sop); 3144 } 3145 out: 3146 nfs4_unlock_state(); 3147 return status; 3148 } 3149 3150 static inline struct nfs4_client_reclaim * 3151 alloc_reclaim(void) 3152 { 3153 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 3154 } 3155 3156 int 3157 nfs4_has_reclaimed_state(const char *name) 3158 { 3159 unsigned int strhashval = clientstr_hashval(name); 3160 struct nfs4_client *clp; 3161 3162 clp = find_confirmed_client_by_str(name, strhashval); 3163 return clp ? 1 : 0; 3164 } 3165 3166 /* 3167 * failure => all reset bets are off, nfserr_no_grace... 3168 */ 3169 int 3170 nfs4_client_to_reclaim(const char *name) 3171 { 3172 unsigned int strhashval; 3173 struct nfs4_client_reclaim *crp = NULL; 3174 3175 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 3176 crp = alloc_reclaim(); 3177 if (!crp) 3178 return 0; 3179 strhashval = clientstr_hashval(name); 3180 INIT_LIST_HEAD(&crp->cr_strhash); 3181 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 3182 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 3183 reclaim_str_hashtbl_size++; 3184 return 1; 3185 } 3186 3187 static void 3188 nfs4_release_reclaim(void) 3189 { 3190 struct nfs4_client_reclaim *crp = NULL; 3191 int i; 3192 3193 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3194 while (!list_empty(&reclaim_str_hashtbl[i])) { 3195 crp = list_entry(reclaim_str_hashtbl[i].next, 3196 struct nfs4_client_reclaim, cr_strhash); 3197 list_del(&crp->cr_strhash); 3198 kfree(crp); 3199 reclaim_str_hashtbl_size--; 3200 } 3201 } 3202 BUG_ON(reclaim_str_hashtbl_size); 3203 } 3204 3205 /* 3206 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 3207 static struct nfs4_client_reclaim * 3208 nfs4_find_reclaim_client(clientid_t *clid) 3209 { 3210 unsigned int strhashval; 3211 struct nfs4_client *clp; 3212 struct nfs4_client_reclaim *crp = NULL; 3213 3214 3215 /* find clientid in conf_id_hashtbl */ 3216 clp = find_confirmed_client(clid); 3217 if (clp == NULL) 3218 return NULL; 3219 3220 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", 3221 clp->cl_name.len, clp->cl_name.data, 3222 clp->cl_recdir); 3223 3224 /* find clp->cl_name in reclaim_str_hashtbl */ 3225 strhashval = clientstr_hashval(clp->cl_recdir); 3226 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 3227 if (same_name(crp->cr_recdir, clp->cl_recdir)) { 3228 return crp; 3229 } 3230 } 3231 return NULL; 3232 } 3233 3234 /* 3235 * Called from OPEN. Look for clientid in reclaim list. 3236 */ 3237 __be32 3238 nfs4_check_open_reclaim(clientid_t *clid) 3239 { 3240 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; 3241 } 3242 3243 /* initialization to perform at module load time: */ 3244 3245 int 3246 nfs4_state_init(void) 3247 { 3248 int i, status; 3249 3250 status = nfsd4_init_slabs(); 3251 if (status) 3252 return status; 3253 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3254 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 3255 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 3256 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 3257 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 3258 } 3259 for (i = 0; i < SESSION_HASH_SIZE; i++) 3260 INIT_LIST_HEAD(&sessionid_hashtbl[i]); 3261 for (i = 0; i < FILE_HASH_SIZE; i++) { 3262 INIT_LIST_HEAD(&file_hashtbl[i]); 3263 } 3264 for (i = 0; i < OWNER_HASH_SIZE; i++) { 3265 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 3266 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 3267 } 3268 for (i = 0; i < STATEID_HASH_SIZE; i++) { 3269 INIT_LIST_HEAD(&stateid_hashtbl[i]); 3270 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 3271 } 3272 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3273 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 3274 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 3275 } 3276 memset(&onestateid, ~0, sizeof(stateid_t)); 3277 INIT_LIST_HEAD(&close_lru); 3278 INIT_LIST_HEAD(&client_lru); 3279 INIT_LIST_HEAD(&del_recall_lru); 3280 for (i = 0; i < CLIENT_HASH_SIZE; i++) 3281 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 3282 reclaim_str_hashtbl_size = 0; 3283 return 0; 3284 } 3285 3286 static void 3287 nfsd4_load_reboot_recovery_data(void) 3288 { 3289 int status; 3290 3291 nfs4_lock_state(); 3292 nfsd4_init_recdir(user_recovery_dirname); 3293 status = nfsd4_recdir_load(); 3294 nfs4_unlock_state(); 3295 if (status) 3296 printk("NFSD: Failure reading reboot recovery data\n"); 3297 } 3298 3299 unsigned long 3300 get_nfs4_grace_period(void) 3301 { 3302 return max(user_lease_time, lease_time) * HZ; 3303 } 3304 3305 /* 3306 * Since the lifetime of a delegation isn't limited to that of an open, a 3307 * client may quite reasonably hang on to a delegation as long as it has 3308 * the inode cached. This becomes an obvious problem the first time a 3309 * client's inode cache approaches the size of the server's total memory. 3310 * 3311 * For now we avoid this problem by imposing a hard limit on the number 3312 * of delegations, which varies according to the server's memory size. 3313 */ 3314 static void 3315 set_max_delegations(void) 3316 { 3317 /* 3318 * Allow at most 4 delegations per megabyte of RAM. Quick 3319 * estimates suggest that in the worst case (where every delegation 3320 * is for a different inode), a delegation could take about 1.5K, 3321 * giving a worst case usage of about 6% of memory. 3322 */ 3323 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); 3324 } 3325 3326 /* initialization to perform when the nfsd service is started: */ 3327 3328 static void 3329 __nfs4_state_start(void) 3330 { 3331 unsigned long grace_time; 3332 3333 boot_time = get_seconds(); 3334 grace_time = get_nfs4_grace_period(); 3335 lease_time = user_lease_time; 3336 locks_start_grace(&nfsd4_manager); 3337 printk(KERN_INFO "NFSD: starting %ld-second grace period\n", 3338 grace_time/HZ); 3339 laundry_wq = create_singlethread_workqueue("nfsd4"); 3340 queue_delayed_work(laundry_wq, &laundromat_work, grace_time); 3341 set_max_delegations(); 3342 } 3343 3344 void 3345 nfs4_state_start(void) 3346 { 3347 if (nfs4_init) 3348 return; 3349 nfsd4_load_reboot_recovery_data(); 3350 __nfs4_state_start(); 3351 nfs4_init = 1; 3352 return; 3353 } 3354 3355 time_t 3356 nfs4_lease_time(void) 3357 { 3358 return lease_time; 3359 } 3360 3361 static void 3362 __nfs4_state_shutdown(void) 3363 { 3364 int i; 3365 struct nfs4_client *clp = NULL; 3366 struct nfs4_delegation *dp = NULL; 3367 struct list_head *pos, *next, reaplist; 3368 3369 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3370 while (!list_empty(&conf_id_hashtbl[i])) { 3371 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 3372 expire_client(clp); 3373 } 3374 while (!list_empty(&unconf_str_hashtbl[i])) { 3375 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 3376 expire_client(clp); 3377 } 3378 } 3379 INIT_LIST_HEAD(&reaplist); 3380 spin_lock(&recall_lock); 3381 list_for_each_safe(pos, next, &del_recall_lru) { 3382 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3383 list_move(&dp->dl_recall_lru, &reaplist); 3384 } 3385 spin_unlock(&recall_lock); 3386 list_for_each_safe(pos, next, &reaplist) { 3387 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3388 list_del_init(&dp->dl_recall_lru); 3389 unhash_delegation(dp); 3390 } 3391 3392 nfsd4_shutdown_recdir(); 3393 nfs4_init = 0; 3394 } 3395 3396 void 3397 nfs4_state_shutdown(void) 3398 { 3399 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); 3400 destroy_workqueue(laundry_wq); 3401 locks_end_grace(&nfsd4_manager); 3402 nfs4_lock_state(); 3403 nfs4_release_reclaim(); 3404 __nfs4_state_shutdown(); 3405 nfs4_unlock_state(); 3406 } 3407 3408 /* 3409 * user_recovery_dirname is protected by the nfsd_mutex since it's only 3410 * accessed when nfsd is starting. 3411 */ 3412 static void 3413 nfs4_set_recdir(char *recdir) 3414 { 3415 strcpy(user_recovery_dirname, recdir); 3416 } 3417 3418 /* 3419 * Change the NFSv4 recovery directory to recdir. 3420 */ 3421 int 3422 nfs4_reset_recoverydir(char *recdir) 3423 { 3424 int status; 3425 struct path path; 3426 3427 status = kern_path(recdir, LOOKUP_FOLLOW, &path); 3428 if (status) 3429 return status; 3430 status = -ENOTDIR; 3431 if (S_ISDIR(path.dentry->d_inode->i_mode)) { 3432 nfs4_set_recdir(recdir); 3433 status = 0; 3434 } 3435 path_put(&path); 3436 return status; 3437 } 3438 3439 char * 3440 nfs4_recoverydir(void) 3441 { 3442 return user_recovery_dirname; 3443 } 3444 3445 /* 3446 * Called when leasetime is changed. 3447 * 3448 * The only way the protocol gives us to handle on-the-fly lease changes is to 3449 * simulate a reboot. Instead of doing that, we just wait till the next time 3450 * we start to register any changes in lease time. If the administrator 3451 * really wants to change the lease time *now*, they can go ahead and bring 3452 * nfsd down and then back up again after changing the lease time. 3453 * 3454 * user_lease_time is protected by nfsd_mutex since it's only really accessed 3455 * when nfsd is starting 3456 */ 3457 void 3458 nfs4_reset_lease(time_t leasetime) 3459 { 3460 user_lease_time = leasetime; 3461 } 3462