1 /* 2 * linux/fs/nfsd/nfs4state.c 3 * 4 * Copyright (c) 2001 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Kendrick Smith <kmsmith@umich.edu> 8 * Andy Adamson <kandros@umich.edu> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 * 35 */ 36 37 #include <linux/param.h> 38 #include <linux/major.h> 39 #include <linux/slab.h> 40 41 #include <linux/sunrpc/svc.h> 42 #include <linux/nfsd/nfsd.h> 43 #include <linux/nfsd/cache.h> 44 #include <linux/mount.h> 45 #include <linux/workqueue.h> 46 #include <linux/smp_lock.h> 47 #include <linux/kthread.h> 48 #include <linux/nfs4.h> 49 #include <linux/nfsd/state.h> 50 #include <linux/nfsd/xdr4.h> 51 #include <linux/namei.h> 52 #include <linux/swap.h> 53 #include <linux/mutex.h> 54 #include <linux/lockd/bind.h> 55 #include <linux/module.h> 56 57 #define NFSDDBG_FACILITY NFSDDBG_PROC 58 59 /* Globals */ 60 static time_t lease_time = 90; /* default lease time */ 61 static time_t user_lease_time = 90; 62 static time_t boot_time; 63 static int in_grace = 1; 64 static u32 current_clientid = 1; 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 void release_stateid_lockowners(struct nfs4_stateid *open_stp); 79 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; 80 static void nfs4_set_recdir(char *recdir); 81 82 /* Locking: 83 * 84 * client_mutex: 85 * protects clientid_hashtbl[], clientstr_hashtbl[], 86 * unconfstr_hashtbl[], uncofid_hashtbl[]. 87 */ 88 static DEFINE_MUTEX(client_mutex); 89 90 static struct kmem_cache *stateowner_slab = NULL; 91 static struct kmem_cache *file_slab = NULL; 92 static struct kmem_cache *stateid_slab = NULL; 93 static struct kmem_cache *deleg_slab = NULL; 94 95 void 96 nfs4_lock_state(void) 97 { 98 mutex_lock(&client_mutex); 99 } 100 101 void 102 nfs4_unlock_state(void) 103 { 104 mutex_unlock(&client_mutex); 105 } 106 107 static inline u32 108 opaque_hashval(const void *ptr, int nbytes) 109 { 110 unsigned char *cptr = (unsigned char *) ptr; 111 112 u32 x = 0; 113 while (nbytes--) { 114 x *= 37; 115 x += *cptr++; 116 } 117 return x; 118 } 119 120 /* forward declarations */ 121 static void release_stateowner(struct nfs4_stateowner *sop); 122 static void release_stateid(struct nfs4_stateid *stp, int flags); 123 124 /* 125 * Delegation state 126 */ 127 128 /* recall_lock protects the del_recall_lru */ 129 static DEFINE_SPINLOCK(recall_lock); 130 static struct list_head del_recall_lru; 131 132 static void 133 free_nfs4_file(struct kref *kref) 134 { 135 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref); 136 list_del(&fp->fi_hash); 137 iput(fp->fi_inode); 138 kmem_cache_free(file_slab, fp); 139 } 140 141 static inline void 142 put_nfs4_file(struct nfs4_file *fi) 143 { 144 kref_put(&fi->fi_ref, free_nfs4_file); 145 } 146 147 static inline void 148 get_nfs4_file(struct nfs4_file *fi) 149 { 150 kref_get(&fi->fi_ref); 151 } 152 153 static int num_delegations; 154 unsigned int max_delegations; 155 156 /* 157 * Open owner state (share locks) 158 */ 159 160 /* hash tables for nfs4_stateowner */ 161 #define OWNER_HASH_BITS 8 162 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 163 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 164 165 #define ownerid_hashval(id) \ 166 ((id) & OWNER_HASH_MASK) 167 #define ownerstr_hashval(clientid, ownername) \ 168 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 169 170 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 171 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 172 173 /* hash table for nfs4_file */ 174 #define FILE_HASH_BITS 8 175 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 176 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 177 /* hash table for (open)nfs4_stateid */ 178 #define STATEID_HASH_BITS 10 179 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 180 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 181 182 #define file_hashval(x) \ 183 hash_ptr(x, FILE_HASH_BITS) 184 #define stateid_hashval(owner_id, file_id) \ 185 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 186 187 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 188 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 189 190 static struct nfs4_delegation * 191 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 192 { 193 struct nfs4_delegation *dp; 194 struct nfs4_file *fp = stp->st_file; 195 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback; 196 197 dprintk("NFSD alloc_init_deleg\n"); 198 if (fp->fi_had_conflict) 199 return NULL; 200 if (num_delegations > max_delegations) 201 return NULL; 202 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); 203 if (dp == NULL) 204 return dp; 205 num_delegations++; 206 INIT_LIST_HEAD(&dp->dl_perfile); 207 INIT_LIST_HEAD(&dp->dl_perclnt); 208 INIT_LIST_HEAD(&dp->dl_recall_lru); 209 dp->dl_client = clp; 210 get_nfs4_file(fp); 211 dp->dl_file = fp; 212 dp->dl_flock = NULL; 213 get_file(stp->st_vfs_file); 214 dp->dl_vfs_file = stp->st_vfs_file; 215 dp->dl_type = type; 216 dp->dl_recall.cbr_dp = NULL; 217 dp->dl_recall.cbr_ident = cb->cb_ident; 218 dp->dl_recall.cbr_trunc = 0; 219 dp->dl_stateid.si_boot = boot_time; 220 dp->dl_stateid.si_stateownerid = current_delegid++; 221 dp->dl_stateid.si_fileid = 0; 222 dp->dl_stateid.si_generation = 0; 223 dp->dl_fhlen = current_fh->fh_handle.fh_size; 224 memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base, 225 current_fh->fh_handle.fh_size); 226 dp->dl_time = 0; 227 atomic_set(&dp->dl_count, 1); 228 list_add(&dp->dl_perfile, &fp->fi_delegations); 229 list_add(&dp->dl_perclnt, &clp->cl_delegations); 230 return dp; 231 } 232 233 void 234 nfs4_put_delegation(struct nfs4_delegation *dp) 235 { 236 if (atomic_dec_and_test(&dp->dl_count)) { 237 dprintk("NFSD: freeing dp %p\n",dp); 238 put_nfs4_file(dp->dl_file); 239 kmem_cache_free(deleg_slab, dp); 240 num_delegations--; 241 } 242 } 243 244 /* Remove the associated file_lock first, then remove the delegation. 245 * lease_modify() is called to remove the FS_LEASE file_lock from 246 * the i_flock list, eventually calling nfsd's lock_manager 247 * fl_release_callback. 248 */ 249 static void 250 nfs4_close_delegation(struct nfs4_delegation *dp) 251 { 252 struct file *filp = dp->dl_vfs_file; 253 254 dprintk("NFSD: close_delegation dp %p\n",dp); 255 dp->dl_vfs_file = NULL; 256 /* The following nfsd_close may not actually close the file, 257 * but we want to remove the lease in any case. */ 258 if (dp->dl_flock) 259 vfs_setlease(filp, F_UNLCK, &dp->dl_flock); 260 nfsd_close(filp); 261 } 262 263 /* Called under the state lock. */ 264 static void 265 unhash_delegation(struct nfs4_delegation *dp) 266 { 267 list_del_init(&dp->dl_perfile); 268 list_del_init(&dp->dl_perclnt); 269 spin_lock(&recall_lock); 270 list_del_init(&dp->dl_recall_lru); 271 spin_unlock(&recall_lock); 272 nfs4_close_delegation(dp); 273 nfs4_put_delegation(dp); 274 } 275 276 /* 277 * SETCLIENTID state 278 */ 279 280 /* Hash tables for nfs4_clientid state */ 281 #define CLIENT_HASH_BITS 4 282 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 283 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 284 285 #define clientid_hashval(id) \ 286 ((id) & CLIENT_HASH_MASK) 287 #define clientstr_hashval(name) \ 288 (opaque_hashval((name), 8) & CLIENT_HASH_MASK) 289 /* 290 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 291 * used in reboot/reset lease grace period processing 292 * 293 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 294 * setclientid_confirmed info. 295 * 296 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 297 * setclientid info. 298 * 299 * client_lru holds client queue ordered by nfs4_client.cl_time 300 * for lease renewal. 301 * 302 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 303 * for last close replay. 304 */ 305 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 306 static int reclaim_str_hashtbl_size = 0; 307 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 308 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 309 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 310 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 311 static struct list_head client_lru; 312 static struct list_head close_lru; 313 314 static inline void 315 renew_client(struct nfs4_client *clp) 316 { 317 /* 318 * Move client to the end to the LRU list. 319 */ 320 dprintk("renewing client (clientid %08x/%08x)\n", 321 clp->cl_clientid.cl_boot, 322 clp->cl_clientid.cl_id); 323 list_move_tail(&clp->cl_lru, &client_lru); 324 clp->cl_time = get_seconds(); 325 } 326 327 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 328 static int 329 STALE_CLIENTID(clientid_t *clid) 330 { 331 if (clid->cl_boot == boot_time) 332 return 0; 333 dprintk("NFSD stale clientid (%08x/%08x)\n", 334 clid->cl_boot, clid->cl_id); 335 return 1; 336 } 337 338 /* 339 * XXX Should we use a slab cache ? 340 * This type of memory management is somewhat inefficient, but we use it 341 * anyway since SETCLIENTID is not a common operation. 342 */ 343 static inline struct nfs4_client * 344 alloc_client(struct xdr_netobj name) 345 { 346 struct nfs4_client *clp; 347 348 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) { 349 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) { 350 memcpy(clp->cl_name.data, name.data, name.len); 351 clp->cl_name.len = name.len; 352 } 353 else { 354 kfree(clp); 355 clp = NULL; 356 } 357 } 358 return clp; 359 } 360 361 static void 362 shutdown_callback_client(struct nfs4_client *clp) 363 { 364 struct rpc_clnt *clnt = clp->cl_callback.cb_client; 365 366 /* shutdown rpc client, ending any outstanding recall rpcs */ 367 if (clnt) { 368 clp->cl_callback.cb_client = NULL; 369 rpc_shutdown_client(clnt); 370 } 371 } 372 373 static inline void 374 free_client(struct nfs4_client *clp) 375 { 376 shutdown_callback_client(clp); 377 if (clp->cl_cred.cr_group_info) 378 put_group_info(clp->cl_cred.cr_group_info); 379 kfree(clp->cl_name.data); 380 kfree(clp); 381 } 382 383 void 384 put_nfs4_client(struct nfs4_client *clp) 385 { 386 if (atomic_dec_and_test(&clp->cl_count)) 387 free_client(clp); 388 } 389 390 static void 391 expire_client(struct nfs4_client *clp) 392 { 393 struct nfs4_stateowner *sop; 394 struct nfs4_delegation *dp; 395 struct list_head reaplist; 396 397 dprintk("NFSD: expire_client cl_count %d\n", 398 atomic_read(&clp->cl_count)); 399 400 INIT_LIST_HEAD(&reaplist); 401 spin_lock(&recall_lock); 402 while (!list_empty(&clp->cl_delegations)) { 403 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 404 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 405 dp->dl_flock); 406 list_del_init(&dp->dl_perclnt); 407 list_move(&dp->dl_recall_lru, &reaplist); 408 } 409 spin_unlock(&recall_lock); 410 while (!list_empty(&reaplist)) { 411 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 412 list_del_init(&dp->dl_recall_lru); 413 unhash_delegation(dp); 414 } 415 list_del(&clp->cl_idhash); 416 list_del(&clp->cl_strhash); 417 list_del(&clp->cl_lru); 418 while (!list_empty(&clp->cl_openowners)) { 419 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); 420 release_stateowner(sop); 421 } 422 put_nfs4_client(clp); 423 } 424 425 static struct nfs4_client * 426 create_client(struct xdr_netobj name, char *recdir) { 427 struct nfs4_client *clp; 428 429 if (!(clp = alloc_client(name))) 430 goto out; 431 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); 432 atomic_set(&clp->cl_count, 1); 433 atomic_set(&clp->cl_callback.cb_set, 0); 434 INIT_LIST_HEAD(&clp->cl_idhash); 435 INIT_LIST_HEAD(&clp->cl_strhash); 436 INIT_LIST_HEAD(&clp->cl_openowners); 437 INIT_LIST_HEAD(&clp->cl_delegations); 438 INIT_LIST_HEAD(&clp->cl_lru); 439 out: 440 return clp; 441 } 442 443 static void 444 copy_verf(struct nfs4_client *target, nfs4_verifier *source) { 445 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data)); 446 } 447 448 static void 449 copy_clid(struct nfs4_client *target, struct nfs4_client *source) { 450 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 451 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 452 } 453 454 static void 455 copy_cred(struct svc_cred *target, struct svc_cred *source) { 456 457 target->cr_uid = source->cr_uid; 458 target->cr_gid = source->cr_gid; 459 target->cr_group_info = source->cr_group_info; 460 get_group_info(target->cr_group_info); 461 } 462 463 static inline int 464 same_name(const char *n1, const char *n2) 465 { 466 return 0 == memcmp(n1, n2, HEXDIR_LEN); 467 } 468 469 static int 470 same_verf(nfs4_verifier *v1, nfs4_verifier *v2) 471 { 472 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); 473 } 474 475 static int 476 same_clid(clientid_t *cl1, clientid_t *cl2) 477 { 478 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); 479 } 480 481 /* XXX what about NGROUP */ 482 static int 483 same_creds(struct svc_cred *cr1, struct svc_cred *cr2) 484 { 485 return cr1->cr_uid == cr2->cr_uid; 486 } 487 488 static void 489 gen_clid(struct nfs4_client *clp) { 490 clp->cl_clientid.cl_boot = boot_time; 491 clp->cl_clientid.cl_id = current_clientid++; 492 } 493 494 static void 495 gen_confirm(struct nfs4_client *clp) { 496 struct timespec tv; 497 u32 * p; 498 499 tv = CURRENT_TIME; 500 p = (u32 *)clp->cl_confirm.data; 501 *p++ = tv.tv_sec; 502 *p++ = tv.tv_nsec; 503 } 504 505 static int 506 check_name(struct xdr_netobj name) { 507 508 if (name.len == 0) 509 return 0; 510 if (name.len > NFS4_OPAQUE_LIMIT) { 511 dprintk("NFSD: check_name: name too long(%d)!\n", name.len); 512 return 0; 513 } 514 return 1; 515 } 516 517 static void 518 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 519 { 520 unsigned int idhashval; 521 522 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 523 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 524 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 525 list_add_tail(&clp->cl_lru, &client_lru); 526 clp->cl_time = get_seconds(); 527 } 528 529 static void 530 move_to_confirmed(struct nfs4_client *clp) 531 { 532 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 533 unsigned int strhashval; 534 535 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 536 list_del_init(&clp->cl_strhash); 537 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 538 strhashval = clientstr_hashval(clp->cl_recdir); 539 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 540 renew_client(clp); 541 } 542 543 static struct nfs4_client * 544 find_confirmed_client(clientid_t *clid) 545 { 546 struct nfs4_client *clp; 547 unsigned int idhashval = clientid_hashval(clid->cl_id); 548 549 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 550 if (same_clid(&clp->cl_clientid, clid)) 551 return clp; 552 } 553 return NULL; 554 } 555 556 static struct nfs4_client * 557 find_unconfirmed_client(clientid_t *clid) 558 { 559 struct nfs4_client *clp; 560 unsigned int idhashval = clientid_hashval(clid->cl_id); 561 562 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 563 if (same_clid(&clp->cl_clientid, clid)) 564 return clp; 565 } 566 return NULL; 567 } 568 569 static struct nfs4_client * 570 find_confirmed_client_by_str(const char *dname, unsigned int hashval) 571 { 572 struct nfs4_client *clp; 573 574 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { 575 if (same_name(clp->cl_recdir, dname)) 576 return clp; 577 } 578 return NULL; 579 } 580 581 static struct nfs4_client * 582 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval) 583 { 584 struct nfs4_client *clp; 585 586 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { 587 if (same_name(clp->cl_recdir, dname)) 588 return clp; 589 } 590 return NULL; 591 } 592 593 /* a helper function for parse_callback */ 594 static int 595 parse_octet(unsigned int *lenp, char **addrp) 596 { 597 unsigned int len = *lenp; 598 char *p = *addrp; 599 int n = -1; 600 char c; 601 602 for (;;) { 603 if (!len) 604 break; 605 len--; 606 c = *p++; 607 if (c == '.') 608 break; 609 if ((c < '0') || (c > '9')) { 610 n = -1; 611 break; 612 } 613 if (n < 0) 614 n = 0; 615 n = (n * 10) + (c - '0'); 616 if (n > 255) { 617 n = -1; 618 break; 619 } 620 } 621 *lenp = len; 622 *addrp = p; 623 return n; 624 } 625 626 /* parse and set the setclientid ipv4 callback address */ 627 static int 628 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp) 629 { 630 int temp = 0; 631 u32 cbaddr = 0; 632 u16 cbport = 0; 633 u32 addrlen = addr_len; 634 char *addr = addr_val; 635 int i, shift; 636 637 /* ipaddress */ 638 shift = 24; 639 for(i = 4; i > 0 ; i--) { 640 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 641 return 0; 642 } 643 cbaddr |= (temp << shift); 644 if (shift > 0) 645 shift -= 8; 646 } 647 *cbaddrp = cbaddr; 648 649 /* port */ 650 shift = 8; 651 for(i = 2; i > 0 ; i--) { 652 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 653 return 0; 654 } 655 cbport |= (temp << shift); 656 if (shift > 0) 657 shift -= 8; 658 } 659 *cbportp = cbport; 660 return 1; 661 } 662 663 static void 664 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se) 665 { 666 struct nfs4_callback *cb = &clp->cl_callback; 667 668 /* Currently, we only support tcp for the callback channel */ 669 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3)) 670 goto out_err; 671 672 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val, 673 &cb->cb_addr, &cb->cb_port))) 674 goto out_err; 675 cb->cb_prog = se->se_callback_prog; 676 cb->cb_ident = se->se_callback_ident; 677 return; 678 out_err: 679 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 680 "will not receive delegations\n", 681 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 682 683 return; 684 } 685 686 /* 687 * RFC 3010 has a complex implmentation description of processing a 688 * SETCLIENTID request consisting of 5 bullets, labeled as 689 * CASE0 - CASE4 below. 690 * 691 * NOTES: 692 * callback information will be processed in a future patch 693 * 694 * an unconfirmed record is added when: 695 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record. 696 * CASE 1: confirmed record found with matching name, principal, 697 * verifier, and clientid. 698 * CASE 2: confirmed record found with matching name, principal, 699 * and there is no unconfirmed record with matching 700 * name and principal 701 * 702 * an unconfirmed record is replaced when: 703 * CASE 3: confirmed record found with matching name, principal, 704 * and an unconfirmed record is found with matching 705 * name, principal, and with clientid and 706 * confirm that does not match the confirmed record. 707 * CASE 4: there is no confirmed record with matching name and 708 * principal. there is an unconfirmed record with 709 * matching name, principal. 710 * 711 * an unconfirmed record is deleted when: 712 * CASE 1: an unconfirmed record that matches input name, verifier, 713 * and confirmed clientid. 714 * CASE 4: any unconfirmed records with matching name and principal 715 * that exist after an unconfirmed record has been replaced 716 * as described above. 717 * 718 */ 719 __be32 720 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 721 struct nfsd4_setclientid *setclid) 722 { 723 struct sockaddr_in *sin = svc_addr_in(rqstp); 724 struct xdr_netobj clname = { 725 .len = setclid->se_namelen, 726 .data = setclid->se_name, 727 }; 728 nfs4_verifier clverifier = setclid->se_verf; 729 unsigned int strhashval; 730 struct nfs4_client *conf, *unconf, *new; 731 __be32 status; 732 char dname[HEXDIR_LEN]; 733 734 if (!check_name(clname)) 735 return nfserr_inval; 736 737 status = nfs4_make_rec_clidname(dname, &clname); 738 if (status) 739 return status; 740 741 /* 742 * XXX The Duplicate Request Cache (DRC) has been checked (??) 743 * We get here on a DRC miss. 744 */ 745 746 strhashval = clientstr_hashval(dname); 747 748 nfs4_lock_state(); 749 conf = find_confirmed_client_by_str(dname, strhashval); 750 if (conf) { 751 /* 752 * CASE 0: 753 * clname match, confirmed, different principal 754 * or different ip_address 755 */ 756 status = nfserr_clid_inuse; 757 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred) 758 || conf->cl_addr != sin->sin_addr.s_addr) { 759 dprintk("NFSD: setclientid: string in use by client" 760 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr)); 761 goto out; 762 } 763 } 764 unconf = find_unconfirmed_client_by_str(dname, strhashval); 765 status = nfserr_resource; 766 if (!conf) { 767 /* 768 * CASE 4: 769 * placed first, because it is the normal case. 770 */ 771 if (unconf) 772 expire_client(unconf); 773 new = create_client(clname, dname); 774 if (new == NULL) 775 goto out; 776 gen_clid(new); 777 } else if (same_verf(&conf->cl_verifier, &clverifier)) { 778 /* 779 * CASE 1: 780 * cl_name match, confirmed, principal match 781 * verifier match: probable callback update 782 * 783 * remove any unconfirmed nfs4_client with 784 * matching cl_name, cl_verifier, and cl_clientid 785 * 786 * create and insert an unconfirmed nfs4_client with same 787 * cl_name, cl_verifier, and cl_clientid as existing 788 * nfs4_client, but with the new callback info and a 789 * new cl_confirm 790 */ 791 if (unconf) { 792 /* Note this is removing unconfirmed {*x***}, 793 * which is stronger than RFC recommended {vxc**}. 794 * This has the advantage that there is at most 795 * one {*x***} in either list at any time. 796 */ 797 expire_client(unconf); 798 } 799 new = create_client(clname, dname); 800 if (new == NULL) 801 goto out; 802 copy_clid(new, conf); 803 } else if (!unconf) { 804 /* 805 * CASE 2: 806 * clname match, confirmed, principal match 807 * verfier does not match 808 * no unconfirmed. create a new unconfirmed nfs4_client 809 * using input clverifier, clname, and callback info 810 * and generate a new cl_clientid and cl_confirm. 811 */ 812 new = create_client(clname, dname); 813 if (new == NULL) 814 goto out; 815 gen_clid(new); 816 } else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) { 817 /* 818 * CASE3: 819 * confirmed found (name, principal match) 820 * confirmed verifier does not match input clverifier 821 * 822 * unconfirmed found (name match) 823 * confirmed->cl_confirm != unconfirmed->cl_confirm 824 * 825 * remove unconfirmed. 826 * 827 * create an unconfirmed nfs4_client 828 * with same cl_name as existing confirmed nfs4_client, 829 * but with new callback info, new cl_clientid, 830 * new cl_verifier and a new cl_confirm 831 */ 832 expire_client(unconf); 833 new = create_client(clname, dname); 834 if (new == NULL) 835 goto out; 836 gen_clid(new); 837 } else { 838 /* No cases hit !!! */ 839 status = nfserr_inval; 840 goto out; 841 842 } 843 copy_verf(new, &clverifier); 844 new->cl_addr = sin->sin_addr.s_addr; 845 copy_cred(&new->cl_cred, &rqstp->rq_cred); 846 gen_confirm(new); 847 gen_callback(new, setclid); 848 add_to_unconfirmed(new, strhashval); 849 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 850 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 851 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 852 status = nfs_ok; 853 out: 854 nfs4_unlock_state(); 855 return status; 856 } 857 858 859 /* 860 * RFC 3010 has a complex implmentation description of processing a 861 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing 862 * processing on a DRC miss, labeled as CASE1 - CASE4 below. 863 * 864 * NOTE: callback information will be processed here in a future patch 865 */ 866 __be32 867 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 868 struct nfsd4_compound_state *cstate, 869 struct nfsd4_setclientid_confirm *setclientid_confirm) 870 { 871 struct sockaddr_in *sin = svc_addr_in(rqstp); 872 struct nfs4_client *conf, *unconf; 873 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 874 clientid_t * clid = &setclientid_confirm->sc_clientid; 875 __be32 status; 876 877 if (STALE_CLIENTID(clid)) 878 return nfserr_stale_clientid; 879 /* 880 * XXX The Duplicate Request Cache (DRC) has been checked (??) 881 * We get here on a DRC miss. 882 */ 883 884 nfs4_lock_state(); 885 886 conf = find_confirmed_client(clid); 887 unconf = find_unconfirmed_client(clid); 888 889 status = nfserr_clid_inuse; 890 if (conf && conf->cl_addr != sin->sin_addr.s_addr) 891 goto out; 892 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr) 893 goto out; 894 895 if ((conf && unconf) && 896 (same_verf(&unconf->cl_confirm, &confirm)) && 897 (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) && 898 (same_name(conf->cl_recdir,unconf->cl_recdir)) && 899 (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) { 900 /* CASE 1: 901 * unconf record that matches input clientid and input confirm. 902 * conf record that matches input clientid. 903 * conf and unconf records match names, verifiers 904 */ 905 if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) 906 status = nfserr_clid_inuse; 907 else { 908 /* XXX: We just turn off callbacks until we can handle 909 * change request correctly. */ 910 atomic_set(&conf->cl_callback.cb_set, 0); 911 gen_confirm(conf); 912 nfsd4_remove_clid_dir(unconf); 913 expire_client(unconf); 914 status = nfs_ok; 915 916 } 917 } else if ((conf && !unconf) || 918 ((conf && unconf) && 919 (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) || 920 !same_name(conf->cl_recdir, unconf->cl_recdir)))) { 921 /* CASE 2: 922 * conf record that matches input clientid. 923 * if unconf record matches input clientid, then 924 * unconf->cl_name or unconf->cl_verifier don't match the 925 * conf record. 926 */ 927 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) 928 status = nfserr_clid_inuse; 929 else 930 status = nfs_ok; 931 } else if (!conf && unconf 932 && same_verf(&unconf->cl_confirm, &confirm)) { 933 /* CASE 3: 934 * conf record not found. 935 * unconf record found. 936 * unconf->cl_confirm matches input confirm 937 */ 938 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 939 status = nfserr_clid_inuse; 940 } else { 941 unsigned int hash = 942 clientstr_hashval(unconf->cl_recdir); 943 conf = find_confirmed_client_by_str(unconf->cl_recdir, 944 hash); 945 if (conf) { 946 nfsd4_remove_clid_dir(conf); 947 expire_client(conf); 948 } 949 move_to_confirmed(unconf); 950 conf = unconf; 951 status = nfs_ok; 952 } 953 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) 954 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, 955 &confirm)))) { 956 /* CASE 4: 957 * conf record not found, or if conf, conf->cl_confirm does not 958 * match input confirm. 959 * unconf record not found, or if unconf, unconf->cl_confirm 960 * does not match input confirm. 961 */ 962 status = nfserr_stale_clientid; 963 } else { 964 /* check that we have hit one of the cases...*/ 965 status = nfserr_clid_inuse; 966 } 967 out: 968 if (!status) 969 nfsd4_probe_callback(conf); 970 nfs4_unlock_state(); 971 return status; 972 } 973 974 /* OPEN Share state helper functions */ 975 static inline struct nfs4_file * 976 alloc_init_file(struct inode *ino) 977 { 978 struct nfs4_file *fp; 979 unsigned int hashval = file_hashval(ino); 980 981 fp = kmem_cache_alloc(file_slab, GFP_KERNEL); 982 if (fp) { 983 kref_init(&fp->fi_ref); 984 INIT_LIST_HEAD(&fp->fi_hash); 985 INIT_LIST_HEAD(&fp->fi_stateids); 986 INIT_LIST_HEAD(&fp->fi_delegations); 987 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 988 fp->fi_inode = igrab(ino); 989 fp->fi_id = current_fileid++; 990 fp->fi_had_conflict = false; 991 return fp; 992 } 993 return NULL; 994 } 995 996 static void 997 nfsd4_free_slab(struct kmem_cache **slab) 998 { 999 if (*slab == NULL) 1000 return; 1001 kmem_cache_destroy(*slab); 1002 *slab = NULL; 1003 } 1004 1005 void 1006 nfsd4_free_slabs(void) 1007 { 1008 nfsd4_free_slab(&stateowner_slab); 1009 nfsd4_free_slab(&file_slab); 1010 nfsd4_free_slab(&stateid_slab); 1011 nfsd4_free_slab(&deleg_slab); 1012 } 1013 1014 static int 1015 nfsd4_init_slabs(void) 1016 { 1017 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 1018 sizeof(struct nfs4_stateowner), 0, 0, NULL); 1019 if (stateowner_slab == NULL) 1020 goto out_nomem; 1021 file_slab = kmem_cache_create("nfsd4_files", 1022 sizeof(struct nfs4_file), 0, 0, NULL); 1023 if (file_slab == NULL) 1024 goto out_nomem; 1025 stateid_slab = kmem_cache_create("nfsd4_stateids", 1026 sizeof(struct nfs4_stateid), 0, 0, NULL); 1027 if (stateid_slab == NULL) 1028 goto out_nomem; 1029 deleg_slab = kmem_cache_create("nfsd4_delegations", 1030 sizeof(struct nfs4_delegation), 0, 0, NULL); 1031 if (deleg_slab == NULL) 1032 goto out_nomem; 1033 return 0; 1034 out_nomem: 1035 nfsd4_free_slabs(); 1036 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 1037 return -ENOMEM; 1038 } 1039 1040 void 1041 nfs4_free_stateowner(struct kref *kref) 1042 { 1043 struct nfs4_stateowner *sop = 1044 container_of(kref, struct nfs4_stateowner, so_ref); 1045 kfree(sop->so_owner.data); 1046 kmem_cache_free(stateowner_slab, sop); 1047 } 1048 1049 static inline struct nfs4_stateowner * 1050 alloc_stateowner(struct xdr_netobj *owner) 1051 { 1052 struct nfs4_stateowner *sop; 1053 1054 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 1055 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 1056 memcpy(sop->so_owner.data, owner->data, owner->len); 1057 sop->so_owner.len = owner->len; 1058 kref_init(&sop->so_ref); 1059 return sop; 1060 } 1061 kmem_cache_free(stateowner_slab, sop); 1062 } 1063 return NULL; 1064 } 1065 1066 static struct nfs4_stateowner * 1067 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 1068 struct nfs4_stateowner *sop; 1069 struct nfs4_replay *rp; 1070 unsigned int idhashval; 1071 1072 if (!(sop = alloc_stateowner(&open->op_owner))) 1073 return NULL; 1074 idhashval = ownerid_hashval(current_ownerid); 1075 INIT_LIST_HEAD(&sop->so_idhash); 1076 INIT_LIST_HEAD(&sop->so_strhash); 1077 INIT_LIST_HEAD(&sop->so_perclient); 1078 INIT_LIST_HEAD(&sop->so_stateids); 1079 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ 1080 INIT_LIST_HEAD(&sop->so_close_lru); 1081 sop->so_time = 0; 1082 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 1083 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 1084 list_add(&sop->so_perclient, &clp->cl_openowners); 1085 sop->so_is_open_owner = 1; 1086 sop->so_id = current_ownerid++; 1087 sop->so_client = clp; 1088 sop->so_seqid = open->op_seqid; 1089 sop->so_confirmed = 0; 1090 rp = &sop->so_replay; 1091 rp->rp_status = nfserr_serverfault; 1092 rp->rp_buflen = 0; 1093 rp->rp_buf = rp->rp_ibuf; 1094 return sop; 1095 } 1096 1097 static void 1098 release_stateid_lockowners(struct nfs4_stateid *open_stp) 1099 { 1100 struct nfs4_stateowner *lock_sop; 1101 1102 while (!list_empty(&open_stp->st_lockowners)) { 1103 lock_sop = list_entry(open_stp->st_lockowners.next, 1104 struct nfs4_stateowner, so_perstateid); 1105 /* list_del(&open_stp->st_lockowners); */ 1106 BUG_ON(lock_sop->so_is_open_owner); 1107 release_stateowner(lock_sop); 1108 } 1109 } 1110 1111 static void 1112 unhash_stateowner(struct nfs4_stateowner *sop) 1113 { 1114 struct nfs4_stateid *stp; 1115 1116 list_del(&sop->so_idhash); 1117 list_del(&sop->so_strhash); 1118 if (sop->so_is_open_owner) 1119 list_del(&sop->so_perclient); 1120 list_del(&sop->so_perstateid); 1121 while (!list_empty(&sop->so_stateids)) { 1122 stp = list_entry(sop->so_stateids.next, 1123 struct nfs4_stateid, st_perstateowner); 1124 if (sop->so_is_open_owner) 1125 release_stateid(stp, OPEN_STATE); 1126 else 1127 release_stateid(stp, LOCK_STATE); 1128 } 1129 } 1130 1131 static void 1132 release_stateowner(struct nfs4_stateowner *sop) 1133 { 1134 unhash_stateowner(sop); 1135 list_del(&sop->so_close_lru); 1136 nfs4_put_stateowner(sop); 1137 } 1138 1139 static inline void 1140 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 1141 struct nfs4_stateowner *sop = open->op_stateowner; 1142 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 1143 1144 INIT_LIST_HEAD(&stp->st_hash); 1145 INIT_LIST_HEAD(&stp->st_perstateowner); 1146 INIT_LIST_HEAD(&stp->st_lockowners); 1147 INIT_LIST_HEAD(&stp->st_perfile); 1148 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 1149 list_add(&stp->st_perstateowner, &sop->so_stateids); 1150 list_add(&stp->st_perfile, &fp->fi_stateids); 1151 stp->st_stateowner = sop; 1152 get_nfs4_file(fp); 1153 stp->st_file = fp; 1154 stp->st_stateid.si_boot = boot_time; 1155 stp->st_stateid.si_stateownerid = sop->so_id; 1156 stp->st_stateid.si_fileid = fp->fi_id; 1157 stp->st_stateid.si_generation = 0; 1158 stp->st_access_bmap = 0; 1159 stp->st_deny_bmap = 0; 1160 __set_bit(open->op_share_access, &stp->st_access_bmap); 1161 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1162 stp->st_openstp = NULL; 1163 } 1164 1165 static void 1166 release_stateid(struct nfs4_stateid *stp, int flags) 1167 { 1168 struct file *filp = stp->st_vfs_file; 1169 1170 list_del(&stp->st_hash); 1171 list_del(&stp->st_perfile); 1172 list_del(&stp->st_perstateowner); 1173 if (flags & OPEN_STATE) { 1174 release_stateid_lockowners(stp); 1175 stp->st_vfs_file = NULL; 1176 nfsd_close(filp); 1177 } else if (flags & LOCK_STATE) 1178 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner); 1179 put_nfs4_file(stp->st_file); 1180 kmem_cache_free(stateid_slab, stp); 1181 } 1182 1183 static void 1184 move_to_close_lru(struct nfs4_stateowner *sop) 1185 { 1186 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 1187 1188 list_move_tail(&sop->so_close_lru, &close_lru); 1189 sop->so_time = get_seconds(); 1190 } 1191 1192 static int 1193 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, 1194 clientid_t *clid) 1195 { 1196 return (sop->so_owner.len == owner->len) && 1197 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && 1198 (sop->so_client->cl_clientid.cl_id == clid->cl_id); 1199 } 1200 1201 static struct nfs4_stateowner * 1202 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) 1203 { 1204 struct nfs4_stateowner *so = NULL; 1205 1206 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { 1207 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) 1208 return so; 1209 } 1210 return NULL; 1211 } 1212 1213 /* search file_hashtbl[] for file */ 1214 static struct nfs4_file * 1215 find_file(struct inode *ino) 1216 { 1217 unsigned int hashval = file_hashval(ino); 1218 struct nfs4_file *fp; 1219 1220 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { 1221 if (fp->fi_inode == ino) { 1222 get_nfs4_file(fp); 1223 return fp; 1224 } 1225 } 1226 return NULL; 1227 } 1228 1229 static int access_valid(u32 x) 1230 { 1231 return (x > 0 && x < 4); 1232 } 1233 1234 static int deny_valid(u32 x) 1235 { 1236 return (x >= 0 && x < 5); 1237 } 1238 1239 static void 1240 set_access(unsigned int *access, unsigned long bmap) { 1241 int i; 1242 1243 *access = 0; 1244 for (i = 1; i < 4; i++) { 1245 if (test_bit(i, &bmap)) 1246 *access |= i; 1247 } 1248 } 1249 1250 static void 1251 set_deny(unsigned int *deny, unsigned long bmap) { 1252 int i; 1253 1254 *deny = 0; 1255 for (i = 0; i < 4; i++) { 1256 if (test_bit(i, &bmap)) 1257 *deny |= i ; 1258 } 1259 } 1260 1261 static int 1262 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 1263 unsigned int access, deny; 1264 1265 set_access(&access, stp->st_access_bmap); 1266 set_deny(&deny, stp->st_deny_bmap); 1267 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 1268 return 0; 1269 return 1; 1270 } 1271 1272 /* 1273 * Called to check deny when READ with all zero stateid or 1274 * WRITE with all zero or all one stateid 1275 */ 1276 static __be32 1277 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 1278 { 1279 struct inode *ino = current_fh->fh_dentry->d_inode; 1280 struct nfs4_file *fp; 1281 struct nfs4_stateid *stp; 1282 __be32 ret; 1283 1284 dprintk("NFSD: nfs4_share_conflict\n"); 1285 1286 fp = find_file(ino); 1287 if (!fp) 1288 return nfs_ok; 1289 ret = nfserr_locked; 1290 /* Search for conflicting share reservations */ 1291 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { 1292 if (test_bit(deny_type, &stp->st_deny_bmap) || 1293 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 1294 goto out; 1295 } 1296 ret = nfs_ok; 1297 out: 1298 put_nfs4_file(fp); 1299 return ret; 1300 } 1301 1302 static inline void 1303 nfs4_file_downgrade(struct file *filp, unsigned int share_access) 1304 { 1305 if (share_access & NFS4_SHARE_ACCESS_WRITE) { 1306 put_write_access(filp->f_path.dentry->d_inode); 1307 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; 1308 } 1309 } 1310 1311 /* 1312 * Recall a delegation 1313 */ 1314 static int 1315 do_recall(void *__dp) 1316 { 1317 struct nfs4_delegation *dp = __dp; 1318 1319 dp->dl_file->fi_had_conflict = true; 1320 nfsd4_cb_recall(dp); 1321 return 0; 1322 } 1323 1324 /* 1325 * Spawn a thread to perform a recall on the delegation represented 1326 * by the lease (file_lock) 1327 * 1328 * Called from break_lease() with lock_kernel() held. 1329 * Note: we assume break_lease will only call this *once* for any given 1330 * lease. 1331 */ 1332 static 1333 void nfsd_break_deleg_cb(struct file_lock *fl) 1334 { 1335 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner; 1336 struct task_struct *t; 1337 1338 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 1339 if (!dp) 1340 return; 1341 1342 /* We're assuming the state code never drops its reference 1343 * without first removing the lease. Since we're in this lease 1344 * callback (and since the lease code is serialized by the kernel 1345 * lock) we know the server hasn't removed the lease yet, we know 1346 * it's safe to take a reference: */ 1347 atomic_inc(&dp->dl_count); 1348 atomic_inc(&dp->dl_client->cl_count); 1349 1350 spin_lock(&recall_lock); 1351 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 1352 spin_unlock(&recall_lock); 1353 1354 /* only place dl_time is set. protected by lock_kernel*/ 1355 dp->dl_time = get_seconds(); 1356 1357 /* 1358 * We don't want the locks code to timeout the lease for us; 1359 * we'll remove it ourself if the delegation isn't returned 1360 * in time. 1361 */ 1362 fl->fl_break_time = 0; 1363 1364 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall"); 1365 if (IS_ERR(t)) { 1366 struct nfs4_client *clp = dp->dl_client; 1367 1368 printk(KERN_INFO "NFSD: Callback thread failed for " 1369 "for client (clientid %08x/%08x)\n", 1370 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 1371 put_nfs4_client(dp->dl_client); 1372 nfs4_put_delegation(dp); 1373 } 1374 } 1375 1376 /* 1377 * The file_lock is being reapd. 1378 * 1379 * Called by locks_free_lock() with lock_kernel() held. 1380 */ 1381 static 1382 void nfsd_release_deleg_cb(struct file_lock *fl) 1383 { 1384 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 1385 1386 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count)); 1387 1388 if (!(fl->fl_flags & FL_LEASE) || !dp) 1389 return; 1390 dp->dl_flock = NULL; 1391 } 1392 1393 /* 1394 * Set the delegation file_lock back pointer. 1395 * 1396 * Called from setlease() with lock_kernel() held. 1397 */ 1398 static 1399 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl) 1400 { 1401 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner; 1402 1403 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp); 1404 if (!dp) 1405 return; 1406 dp->dl_flock = new; 1407 } 1408 1409 /* 1410 * Called from setlease() with lock_kernel() held 1411 */ 1412 static 1413 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) 1414 { 1415 struct nfs4_delegation *onlistd = 1416 (struct nfs4_delegation *)onlist->fl_owner; 1417 struct nfs4_delegation *tryd = 1418 (struct nfs4_delegation *)try->fl_owner; 1419 1420 if (onlist->fl_lmops != try->fl_lmops) 1421 return 0; 1422 1423 return onlistd->dl_client == tryd->dl_client; 1424 } 1425 1426 1427 static 1428 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) 1429 { 1430 if (arg & F_UNLCK) 1431 return lease_modify(onlist, arg); 1432 else 1433 return -EAGAIN; 1434 } 1435 1436 static struct lock_manager_operations nfsd_lease_mng_ops = { 1437 .fl_break = nfsd_break_deleg_cb, 1438 .fl_release_private = nfsd_release_deleg_cb, 1439 .fl_copy_lock = nfsd_copy_lock_deleg_cb, 1440 .fl_mylease = nfsd_same_client_deleg_cb, 1441 .fl_change = nfsd_change_deleg_cb, 1442 }; 1443 1444 1445 __be32 1446 nfsd4_process_open1(struct nfsd4_open *open) 1447 { 1448 clientid_t *clientid = &open->op_clientid; 1449 struct nfs4_client *clp = NULL; 1450 unsigned int strhashval; 1451 struct nfs4_stateowner *sop = NULL; 1452 1453 if (!check_name(open->op_owner)) 1454 return nfserr_inval; 1455 1456 if (STALE_CLIENTID(&open->op_clientid)) 1457 return nfserr_stale_clientid; 1458 1459 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); 1460 sop = find_openstateowner_str(strhashval, open); 1461 open->op_stateowner = sop; 1462 if (!sop) { 1463 /* Make sure the client's lease hasn't expired. */ 1464 clp = find_confirmed_client(clientid); 1465 if (clp == NULL) 1466 return nfserr_expired; 1467 goto renew; 1468 } 1469 if (!sop->so_confirmed) { 1470 /* Replace unconfirmed owners without checking for replay. */ 1471 clp = sop->so_client; 1472 release_stateowner(sop); 1473 open->op_stateowner = NULL; 1474 goto renew; 1475 } 1476 if (open->op_seqid == sop->so_seqid - 1) { 1477 if (sop->so_replay.rp_buflen) 1478 return nfserr_replay_me; 1479 /* The original OPEN failed so spectacularly 1480 * that we don't even have replay data saved! 1481 * Therefore, we have no choice but to continue 1482 * processing this OPEN; presumably, we'll 1483 * fail again for the same reason. 1484 */ 1485 dprintk("nfsd4_process_open1: replay with no replay cache\n"); 1486 goto renew; 1487 } 1488 if (open->op_seqid != sop->so_seqid) 1489 return nfserr_bad_seqid; 1490 renew: 1491 if (open->op_stateowner == NULL) { 1492 sop = alloc_init_open_stateowner(strhashval, clp, open); 1493 if (sop == NULL) 1494 return nfserr_resource; 1495 open->op_stateowner = sop; 1496 } 1497 list_del_init(&sop->so_close_lru); 1498 renew_client(sop->so_client); 1499 return nfs_ok; 1500 } 1501 1502 static inline __be32 1503 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 1504 { 1505 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 1506 return nfserr_openmode; 1507 else 1508 return nfs_ok; 1509 } 1510 1511 static struct nfs4_delegation * 1512 find_delegation_file(struct nfs4_file *fp, stateid_t *stid) 1513 { 1514 struct nfs4_delegation *dp; 1515 1516 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) { 1517 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) 1518 return dp; 1519 } 1520 return NULL; 1521 } 1522 1523 static __be32 1524 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, 1525 struct nfs4_delegation **dp) 1526 { 1527 int flags; 1528 __be32 status = nfserr_bad_stateid; 1529 1530 *dp = find_delegation_file(fp, &open->op_delegate_stateid); 1531 if (*dp == NULL) 1532 goto out; 1533 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ? 1534 RD_STATE : WR_STATE; 1535 status = nfs4_check_delegmode(*dp, flags); 1536 if (status) 1537 *dp = NULL; 1538 out: 1539 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR) 1540 return nfs_ok; 1541 if (status) 1542 return status; 1543 open->op_stateowner->so_confirmed = 1; 1544 return nfs_ok; 1545 } 1546 1547 static __be32 1548 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 1549 { 1550 struct nfs4_stateid *local; 1551 __be32 status = nfserr_share_denied; 1552 struct nfs4_stateowner *sop = open->op_stateowner; 1553 1554 list_for_each_entry(local, &fp->fi_stateids, st_perfile) { 1555 /* ignore lock owners */ 1556 if (local->st_stateowner->so_is_open_owner == 0) 1557 continue; 1558 /* remember if we have seen this open owner */ 1559 if (local->st_stateowner == sop) 1560 *stpp = local; 1561 /* check for conflicting share reservations */ 1562 if (!test_share(local, open)) 1563 goto out; 1564 } 1565 status = 0; 1566 out: 1567 return status; 1568 } 1569 1570 static inline struct nfs4_stateid * 1571 nfs4_alloc_stateid(void) 1572 { 1573 return kmem_cache_alloc(stateid_slab, GFP_KERNEL); 1574 } 1575 1576 static __be32 1577 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, 1578 struct nfs4_delegation *dp, 1579 struct svc_fh *cur_fh, int flags) 1580 { 1581 struct nfs4_stateid *stp; 1582 1583 stp = nfs4_alloc_stateid(); 1584 if (stp == NULL) 1585 return nfserr_resource; 1586 1587 if (dp) { 1588 get_file(dp->dl_vfs_file); 1589 stp->st_vfs_file = dp->dl_vfs_file; 1590 } else { 1591 __be32 status; 1592 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, 1593 &stp->st_vfs_file); 1594 if (status) { 1595 if (status == nfserr_dropit) 1596 status = nfserr_jukebox; 1597 kmem_cache_free(stateid_slab, stp); 1598 return status; 1599 } 1600 } 1601 *stpp = stp; 1602 return 0; 1603 } 1604 1605 static inline __be32 1606 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 1607 struct nfsd4_open *open) 1608 { 1609 struct iattr iattr = { 1610 .ia_valid = ATTR_SIZE, 1611 .ia_size = 0, 1612 }; 1613 if (!open->op_truncate) 1614 return 0; 1615 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 1616 return nfserr_inval; 1617 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 1618 } 1619 1620 static __be32 1621 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) 1622 { 1623 struct file *filp = stp->st_vfs_file; 1624 struct inode *inode = filp->f_path.dentry->d_inode; 1625 unsigned int share_access, new_writer; 1626 __be32 status; 1627 1628 set_access(&share_access, stp->st_access_bmap); 1629 new_writer = (~share_access) & open->op_share_access 1630 & NFS4_SHARE_ACCESS_WRITE; 1631 1632 if (new_writer) { 1633 int err = get_write_access(inode); 1634 if (err) 1635 return nfserrno(err); 1636 } 1637 status = nfsd4_truncate(rqstp, cur_fh, open); 1638 if (status) { 1639 if (new_writer) 1640 put_write_access(inode); 1641 return status; 1642 } 1643 /* remember the open */ 1644 filp->f_mode |= open->op_share_access; 1645 set_bit(open->op_share_access, &stp->st_access_bmap); 1646 set_bit(open->op_share_deny, &stp->st_deny_bmap); 1647 1648 return nfs_ok; 1649 } 1650 1651 1652 static void 1653 nfs4_set_claim_prev(struct nfsd4_open *open) 1654 { 1655 open->op_stateowner->so_confirmed = 1; 1656 open->op_stateowner->so_client->cl_firststate = 1; 1657 } 1658 1659 /* 1660 * Attempt to hand out a delegation. 1661 */ 1662 static void 1663 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp) 1664 { 1665 struct nfs4_delegation *dp; 1666 struct nfs4_stateowner *sop = stp->st_stateowner; 1667 struct nfs4_callback *cb = &sop->so_client->cl_callback; 1668 struct file_lock fl, *flp = &fl; 1669 int status, flag = 0; 1670 1671 flag = NFS4_OPEN_DELEGATE_NONE; 1672 open->op_recall = 0; 1673 switch (open->op_claim_type) { 1674 case NFS4_OPEN_CLAIM_PREVIOUS: 1675 if (!atomic_read(&cb->cb_set)) 1676 open->op_recall = 1; 1677 flag = open->op_delegate_type; 1678 if (flag == NFS4_OPEN_DELEGATE_NONE) 1679 goto out; 1680 break; 1681 case NFS4_OPEN_CLAIM_NULL: 1682 /* Let's not give out any delegations till everyone's 1683 * had the chance to reclaim theirs.... */ 1684 if (nfs4_in_grace()) 1685 goto out; 1686 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed) 1687 goto out; 1688 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1689 flag = NFS4_OPEN_DELEGATE_WRITE; 1690 else 1691 flag = NFS4_OPEN_DELEGATE_READ; 1692 break; 1693 default: 1694 goto out; 1695 } 1696 1697 dp = alloc_init_deleg(sop->so_client, stp, fh, flag); 1698 if (dp == NULL) { 1699 flag = NFS4_OPEN_DELEGATE_NONE; 1700 goto out; 1701 } 1702 locks_init_lock(&fl); 1703 fl.fl_lmops = &nfsd_lease_mng_ops; 1704 fl.fl_flags = FL_LEASE; 1705 fl.fl_end = OFFSET_MAX; 1706 fl.fl_owner = (fl_owner_t)dp; 1707 fl.fl_file = stp->st_vfs_file; 1708 fl.fl_pid = current->tgid; 1709 1710 /* vfs_setlease checks to see if delegation should be handed out. 1711 * the lock_manager callbacks fl_mylease and fl_change are used 1712 */ 1713 if ((status = vfs_setlease(stp->st_vfs_file, 1714 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) { 1715 dprintk("NFSD: setlease failed [%d], no delegation\n", status); 1716 unhash_delegation(dp); 1717 flag = NFS4_OPEN_DELEGATE_NONE; 1718 goto out; 1719 } 1720 1721 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); 1722 1723 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n", 1724 dp->dl_stateid.si_boot, 1725 dp->dl_stateid.si_stateownerid, 1726 dp->dl_stateid.si_fileid, 1727 dp->dl_stateid.si_generation); 1728 out: 1729 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS 1730 && flag == NFS4_OPEN_DELEGATE_NONE 1731 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) 1732 dprintk("NFSD: WARNING: refusing delegation reclaim\n"); 1733 open->op_delegate_type = flag; 1734 } 1735 1736 /* 1737 * called with nfs4_lock_state() held. 1738 */ 1739 __be32 1740 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 1741 { 1742 struct nfs4_file *fp = NULL; 1743 struct inode *ino = current_fh->fh_dentry->d_inode; 1744 struct nfs4_stateid *stp = NULL; 1745 struct nfs4_delegation *dp = NULL; 1746 __be32 status; 1747 1748 status = nfserr_inval; 1749 if (!access_valid(open->op_share_access) 1750 || !deny_valid(open->op_share_deny)) 1751 goto out; 1752 /* 1753 * Lookup file; if found, lookup stateid and check open request, 1754 * and check for delegations in the process of being recalled. 1755 * If not found, create the nfs4_file struct 1756 */ 1757 fp = find_file(ino); 1758 if (fp) { 1759 if ((status = nfs4_check_open(fp, open, &stp))) 1760 goto out; 1761 status = nfs4_check_deleg(fp, open, &dp); 1762 if (status) 1763 goto out; 1764 } else { 1765 status = nfserr_bad_stateid; 1766 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) 1767 goto out; 1768 status = nfserr_resource; 1769 fp = alloc_init_file(ino); 1770 if (fp == NULL) 1771 goto out; 1772 } 1773 1774 /* 1775 * OPEN the file, or upgrade an existing OPEN. 1776 * If truncate fails, the OPEN fails. 1777 */ 1778 if (stp) { 1779 /* Stateid was found, this is an OPEN upgrade */ 1780 status = nfs4_upgrade_open(rqstp, current_fh, stp, open); 1781 if (status) 1782 goto out; 1783 update_stateid(&stp->st_stateid); 1784 } else { 1785 /* Stateid was not found, this is a new OPEN */ 1786 int flags = 0; 1787 if (open->op_share_access & NFS4_SHARE_ACCESS_READ) 1788 flags |= MAY_READ; 1789 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1790 flags |= MAY_WRITE; 1791 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags); 1792 if (status) 1793 goto out; 1794 init_stateid(stp, fp, open); 1795 status = nfsd4_truncate(rqstp, current_fh, open); 1796 if (status) { 1797 release_stateid(stp, OPEN_STATE); 1798 goto out; 1799 } 1800 } 1801 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 1802 1803 /* 1804 * Attempt to hand out a delegation. No error return, because the 1805 * OPEN succeeds even if we fail. 1806 */ 1807 nfs4_open_delegation(current_fh, open, stp); 1808 1809 status = nfs_ok; 1810 1811 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n", 1812 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid, 1813 stp->st_stateid.si_fileid, stp->st_stateid.si_generation); 1814 out: 1815 if (fp) 1816 put_nfs4_file(fp); 1817 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 1818 nfs4_set_claim_prev(open); 1819 /* 1820 * To finish the open response, we just need to set the rflags. 1821 */ 1822 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 1823 if (!open->op_stateowner->so_confirmed) 1824 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 1825 1826 return status; 1827 } 1828 1829 static struct workqueue_struct *laundry_wq; 1830 static void laundromat_main(struct work_struct *); 1831 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); 1832 1833 __be32 1834 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 1835 clientid_t *clid) 1836 { 1837 struct nfs4_client *clp; 1838 __be32 status; 1839 1840 nfs4_lock_state(); 1841 dprintk("process_renew(%08x/%08x): starting\n", 1842 clid->cl_boot, clid->cl_id); 1843 status = nfserr_stale_clientid; 1844 if (STALE_CLIENTID(clid)) 1845 goto out; 1846 clp = find_confirmed_client(clid); 1847 status = nfserr_expired; 1848 if (clp == NULL) { 1849 /* We assume the client took too long to RENEW. */ 1850 dprintk("nfsd4_renew: clientid not found!\n"); 1851 goto out; 1852 } 1853 renew_client(clp); 1854 status = nfserr_cb_path_down; 1855 if (!list_empty(&clp->cl_delegations) 1856 && !atomic_read(&clp->cl_callback.cb_set)) 1857 goto out; 1858 status = nfs_ok; 1859 out: 1860 nfs4_unlock_state(); 1861 return status; 1862 } 1863 1864 static void 1865 end_grace(void) 1866 { 1867 dprintk("NFSD: end of grace period\n"); 1868 nfsd4_recdir_purge_old(); 1869 in_grace = 0; 1870 } 1871 1872 static time_t 1873 nfs4_laundromat(void) 1874 { 1875 struct nfs4_client *clp; 1876 struct nfs4_stateowner *sop; 1877 struct nfs4_delegation *dp; 1878 struct list_head *pos, *next, reaplist; 1879 time_t cutoff = get_seconds() - NFSD_LEASE_TIME; 1880 time_t t, clientid_val = NFSD_LEASE_TIME; 1881 time_t u, test_val = NFSD_LEASE_TIME; 1882 1883 nfs4_lock_state(); 1884 1885 dprintk("NFSD: laundromat service - starting\n"); 1886 if (in_grace) 1887 end_grace(); 1888 list_for_each_safe(pos, next, &client_lru) { 1889 clp = list_entry(pos, struct nfs4_client, cl_lru); 1890 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 1891 t = clp->cl_time - cutoff; 1892 if (clientid_val > t) 1893 clientid_val = t; 1894 break; 1895 } 1896 dprintk("NFSD: purging unused client (clientid %08x)\n", 1897 clp->cl_clientid.cl_id); 1898 nfsd4_remove_clid_dir(clp); 1899 expire_client(clp); 1900 } 1901 INIT_LIST_HEAD(&reaplist); 1902 spin_lock(&recall_lock); 1903 list_for_each_safe(pos, next, &del_recall_lru) { 1904 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1905 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 1906 u = dp->dl_time - cutoff; 1907 if (test_val > u) 1908 test_val = u; 1909 break; 1910 } 1911 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 1912 dp, dp->dl_flock); 1913 list_move(&dp->dl_recall_lru, &reaplist); 1914 } 1915 spin_unlock(&recall_lock); 1916 list_for_each_safe(pos, next, &reaplist) { 1917 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1918 list_del_init(&dp->dl_recall_lru); 1919 unhash_delegation(dp); 1920 } 1921 test_val = NFSD_LEASE_TIME; 1922 list_for_each_safe(pos, next, &close_lru) { 1923 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 1924 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 1925 u = sop->so_time - cutoff; 1926 if (test_val > u) 1927 test_val = u; 1928 break; 1929 } 1930 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 1931 sop->so_id); 1932 release_stateowner(sop); 1933 } 1934 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 1935 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 1936 nfs4_unlock_state(); 1937 return clientid_val; 1938 } 1939 1940 void 1941 laundromat_main(struct work_struct *not_used) 1942 { 1943 time_t t; 1944 1945 t = nfs4_laundromat(); 1946 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 1947 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); 1948 } 1949 1950 static struct nfs4_stateowner * 1951 search_close_lru(u32 st_id, int flags) 1952 { 1953 struct nfs4_stateowner *local = NULL; 1954 1955 if (flags & CLOSE_STATE) { 1956 list_for_each_entry(local, &close_lru, so_close_lru) { 1957 if (local->so_id == st_id) 1958 return local; 1959 } 1960 } 1961 return NULL; 1962 } 1963 1964 static inline int 1965 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 1966 { 1967 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode; 1968 } 1969 1970 static int 1971 STALE_STATEID(stateid_t *stateid) 1972 { 1973 if (stateid->si_boot == boot_time) 1974 return 0; 1975 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n", 1976 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 1977 stateid->si_generation); 1978 return 1; 1979 } 1980 1981 static inline int 1982 access_permit_read(unsigned long access_bmap) 1983 { 1984 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 1985 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 1986 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 1987 } 1988 1989 static inline int 1990 access_permit_write(unsigned long access_bmap) 1991 { 1992 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 1993 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 1994 } 1995 1996 static 1997 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 1998 { 1999 __be32 status = nfserr_openmode; 2000 2001 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 2002 goto out; 2003 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 2004 goto out; 2005 status = nfs_ok; 2006 out: 2007 return status; 2008 } 2009 2010 static inline __be32 2011 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 2012 { 2013 /* Trying to call delegreturn with a special stateid? Yuch: */ 2014 if (!(flags & (RD_STATE | WR_STATE))) 2015 return nfserr_bad_stateid; 2016 else if (ONE_STATEID(stateid) && (flags & RD_STATE)) 2017 return nfs_ok; 2018 else if (nfs4_in_grace()) { 2019 /* Answer in remaining cases depends on existance of 2020 * conflicting state; so we must wait out the grace period. */ 2021 return nfserr_grace; 2022 } else if (flags & WR_STATE) 2023 return nfs4_share_conflict(current_fh, 2024 NFS4_SHARE_DENY_WRITE); 2025 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 2026 return nfs4_share_conflict(current_fh, 2027 NFS4_SHARE_DENY_READ); 2028 } 2029 2030 /* 2031 * Allow READ/WRITE during grace period on recovered state only for files 2032 * that are not able to provide mandatory locking. 2033 */ 2034 static inline int 2035 io_during_grace_disallowed(struct inode *inode, int flags) 2036 { 2037 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE)) 2038 && mandatory_lock(inode); 2039 } 2040 2041 /* 2042 * Checks for stateid operations 2043 */ 2044 __be32 2045 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp) 2046 { 2047 struct nfs4_stateid *stp = NULL; 2048 struct nfs4_delegation *dp = NULL; 2049 stateid_t *stidp; 2050 struct inode *ino = current_fh->fh_dentry->d_inode; 2051 __be32 status; 2052 2053 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n", 2054 stateid->si_boot, stateid->si_stateownerid, 2055 stateid->si_fileid, stateid->si_generation); 2056 if (filpp) 2057 *filpp = NULL; 2058 2059 if (io_during_grace_disallowed(ino, flags)) 2060 return nfserr_grace; 2061 2062 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2063 return check_special_stateids(current_fh, stateid, flags); 2064 2065 /* STALE STATEID */ 2066 status = nfserr_stale_stateid; 2067 if (STALE_STATEID(stateid)) 2068 goto out; 2069 2070 /* BAD STATEID */ 2071 status = nfserr_bad_stateid; 2072 if (!stateid->si_fileid) { /* delegation stateid */ 2073 if(!(dp = find_delegation_stateid(ino, stateid))) { 2074 dprintk("NFSD: delegation stateid not found\n"); 2075 goto out; 2076 } 2077 stidp = &dp->dl_stateid; 2078 } else { /* open or lock stateid */ 2079 if (!(stp = find_stateid(stateid, flags))) { 2080 dprintk("NFSD: open or lock stateid not found\n"); 2081 goto out; 2082 } 2083 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) 2084 goto out; 2085 if (!stp->st_stateowner->so_confirmed) 2086 goto out; 2087 stidp = &stp->st_stateid; 2088 } 2089 if (stateid->si_generation > stidp->si_generation) 2090 goto out; 2091 2092 /* OLD STATEID */ 2093 status = nfserr_old_stateid; 2094 if (stateid->si_generation < stidp->si_generation) 2095 goto out; 2096 if (stp) { 2097 if ((status = nfs4_check_openmode(stp,flags))) 2098 goto out; 2099 renew_client(stp->st_stateowner->so_client); 2100 if (filpp) 2101 *filpp = stp->st_vfs_file; 2102 } else if (dp) { 2103 if ((status = nfs4_check_delegmode(dp, flags))) 2104 goto out; 2105 renew_client(dp->dl_client); 2106 if (flags & DELEG_RET) 2107 unhash_delegation(dp); 2108 if (filpp) 2109 *filpp = dp->dl_vfs_file; 2110 } 2111 status = nfs_ok; 2112 out: 2113 return status; 2114 } 2115 2116 static inline int 2117 setlkflg (int type) 2118 { 2119 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 2120 RD_STATE : WR_STATE; 2121 } 2122 2123 /* 2124 * Checks for sequence id mutating operations. 2125 */ 2126 static __be32 2127 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) 2128 { 2129 struct nfs4_stateid *stp; 2130 struct nfs4_stateowner *sop; 2131 2132 dprintk("NFSD: preprocess_seqid_op: seqid=%d " 2133 "stateid = (%08x/%08x/%08x/%08x)\n", seqid, 2134 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 2135 stateid->si_generation); 2136 2137 *stpp = NULL; 2138 *sopp = NULL; 2139 2140 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 2141 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n"); 2142 return nfserr_bad_stateid; 2143 } 2144 2145 if (STALE_STATEID(stateid)) 2146 return nfserr_stale_stateid; 2147 /* 2148 * We return BAD_STATEID if filehandle doesn't match stateid, 2149 * the confirmed flag is incorrecly set, or the generation 2150 * number is incorrect. 2151 */ 2152 stp = find_stateid(stateid, flags); 2153 if (stp == NULL) { 2154 /* 2155 * Also, we should make sure this isn't just the result of 2156 * a replayed close: 2157 */ 2158 sop = search_close_lru(stateid->si_stateownerid, flags); 2159 if (sop == NULL) 2160 return nfserr_bad_stateid; 2161 *sopp = sop; 2162 goto check_replay; 2163 } 2164 2165 if (lock) { 2166 struct nfs4_stateowner *sop = stp->st_stateowner; 2167 clientid_t *lockclid = &lock->v.new.clientid; 2168 struct nfs4_client *clp = sop->so_client; 2169 int lkflg = 0; 2170 __be32 status; 2171 2172 lkflg = setlkflg(lock->lk_type); 2173 2174 if (lock->lk_is_new) { 2175 if (!sop->so_is_open_owner) 2176 return nfserr_bad_stateid; 2177 if (!same_clid(&clp->cl_clientid, lockclid)) 2178 return nfserr_bad_stateid; 2179 /* stp is the open stateid */ 2180 status = nfs4_check_openmode(stp, lkflg); 2181 if (status) 2182 return status; 2183 } else { 2184 /* stp is the lock stateid */ 2185 status = nfs4_check_openmode(stp->st_openstp, lkflg); 2186 if (status) 2187 return status; 2188 } 2189 } 2190 2191 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) { 2192 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 2193 return nfserr_bad_stateid; 2194 } 2195 2196 *stpp = stp; 2197 *sopp = sop = stp->st_stateowner; 2198 2199 /* 2200 * We now validate the seqid and stateid generation numbers. 2201 * For the moment, we ignore the possibility of 2202 * generation number wraparound. 2203 */ 2204 if (seqid != sop->so_seqid) 2205 goto check_replay; 2206 2207 if (sop->so_confirmed && flags & CONFIRM) { 2208 dprintk("NFSD: preprocess_seqid_op: expected" 2209 " unconfirmed stateowner!\n"); 2210 return nfserr_bad_stateid; 2211 } 2212 if (!sop->so_confirmed && !(flags & CONFIRM)) { 2213 dprintk("NFSD: preprocess_seqid_op: stateowner not" 2214 " confirmed yet!\n"); 2215 return nfserr_bad_stateid; 2216 } 2217 if (stateid->si_generation > stp->st_stateid.si_generation) { 2218 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n"); 2219 return nfserr_bad_stateid; 2220 } 2221 2222 if (stateid->si_generation < stp->st_stateid.si_generation) { 2223 dprintk("NFSD: preprocess_seqid_op: old stateid!\n"); 2224 return nfserr_old_stateid; 2225 } 2226 renew_client(sop->so_client); 2227 return nfs_ok; 2228 2229 check_replay: 2230 if (seqid == sop->so_seqid - 1) { 2231 dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); 2232 /* indicate replay to calling function */ 2233 return nfserr_replay_me; 2234 } 2235 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", 2236 sop->so_seqid, seqid); 2237 *sopp = NULL; 2238 return nfserr_bad_seqid; 2239 } 2240 2241 __be32 2242 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2243 struct nfsd4_open_confirm *oc) 2244 { 2245 __be32 status; 2246 struct nfs4_stateowner *sop; 2247 struct nfs4_stateid *stp; 2248 2249 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 2250 (int)cstate->current_fh.fh_dentry->d_name.len, 2251 cstate->current_fh.fh_dentry->d_name.name); 2252 2253 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); 2254 if (status) 2255 return status; 2256 2257 nfs4_lock_state(); 2258 2259 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2260 oc->oc_seqid, &oc->oc_req_stateid, 2261 CHECK_FH | CONFIRM | OPEN_STATE, 2262 &oc->oc_stateowner, &stp, NULL))) 2263 goto out; 2264 2265 sop = oc->oc_stateowner; 2266 sop->so_confirmed = 1; 2267 update_stateid(&stp->st_stateid); 2268 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 2269 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 2270 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid, 2271 stp->st_stateid.si_boot, 2272 stp->st_stateid.si_stateownerid, 2273 stp->st_stateid.si_fileid, 2274 stp->st_stateid.si_generation); 2275 2276 nfsd4_create_clid_dir(sop->so_client); 2277 out: 2278 if (oc->oc_stateowner) { 2279 nfs4_get_stateowner(oc->oc_stateowner); 2280 cstate->replay_owner = oc->oc_stateowner; 2281 } 2282 nfs4_unlock_state(); 2283 return status; 2284 } 2285 2286 2287 /* 2288 * unset all bits in union bitmap (bmap) that 2289 * do not exist in share (from successful OPEN_DOWNGRADE) 2290 */ 2291 static void 2292 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 2293 { 2294 int i; 2295 for (i = 1; i < 4; i++) { 2296 if ((i & access) != i) 2297 __clear_bit(i, bmap); 2298 } 2299 } 2300 2301 static void 2302 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 2303 { 2304 int i; 2305 for (i = 0; i < 4; i++) { 2306 if ((i & deny) != i) 2307 __clear_bit(i, bmap); 2308 } 2309 } 2310 2311 __be32 2312 nfsd4_open_downgrade(struct svc_rqst *rqstp, 2313 struct nfsd4_compound_state *cstate, 2314 struct nfsd4_open_downgrade *od) 2315 { 2316 __be32 status; 2317 struct nfs4_stateid *stp; 2318 unsigned int share_access; 2319 2320 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 2321 (int)cstate->current_fh.fh_dentry->d_name.len, 2322 cstate->current_fh.fh_dentry->d_name.name); 2323 2324 if (!access_valid(od->od_share_access) 2325 || !deny_valid(od->od_share_deny)) 2326 return nfserr_inval; 2327 2328 nfs4_lock_state(); 2329 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2330 od->od_seqid, 2331 &od->od_stateid, 2332 CHECK_FH | OPEN_STATE, 2333 &od->od_stateowner, &stp, NULL))) 2334 goto out; 2335 2336 status = nfserr_inval; 2337 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 2338 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 2339 stp->st_access_bmap, od->od_share_access); 2340 goto out; 2341 } 2342 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 2343 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 2344 stp->st_deny_bmap, od->od_share_deny); 2345 goto out; 2346 } 2347 set_access(&share_access, stp->st_access_bmap); 2348 nfs4_file_downgrade(stp->st_vfs_file, 2349 share_access & ~od->od_share_access); 2350 2351 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 2352 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 2353 2354 update_stateid(&stp->st_stateid); 2355 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 2356 status = nfs_ok; 2357 out: 2358 if (od->od_stateowner) { 2359 nfs4_get_stateowner(od->od_stateowner); 2360 cstate->replay_owner = od->od_stateowner; 2361 } 2362 nfs4_unlock_state(); 2363 return status; 2364 } 2365 2366 /* 2367 * nfs4_unlock_state() called after encode 2368 */ 2369 __be32 2370 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2371 struct nfsd4_close *close) 2372 { 2373 __be32 status; 2374 struct nfs4_stateid *stp; 2375 2376 dprintk("NFSD: nfsd4_close on file %.*s\n", 2377 (int)cstate->current_fh.fh_dentry->d_name.len, 2378 cstate->current_fh.fh_dentry->d_name.name); 2379 2380 nfs4_lock_state(); 2381 /* check close_lru for replay */ 2382 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2383 close->cl_seqid, 2384 &close->cl_stateid, 2385 CHECK_FH | OPEN_STATE | CLOSE_STATE, 2386 &close->cl_stateowner, &stp, NULL))) 2387 goto out; 2388 status = nfs_ok; 2389 update_stateid(&stp->st_stateid); 2390 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 2391 2392 /* release_stateid() calls nfsd_close() if needed */ 2393 release_stateid(stp, OPEN_STATE); 2394 2395 /* place unused nfs4_stateowners on so_close_lru list to be 2396 * released by the laundromat service after the lease period 2397 * to enable us to handle CLOSE replay 2398 */ 2399 if (list_empty(&close->cl_stateowner->so_stateids)) 2400 move_to_close_lru(close->cl_stateowner); 2401 out: 2402 if (close->cl_stateowner) { 2403 nfs4_get_stateowner(close->cl_stateowner); 2404 cstate->replay_owner = close->cl_stateowner; 2405 } 2406 nfs4_unlock_state(); 2407 return status; 2408 } 2409 2410 __be32 2411 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2412 struct nfsd4_delegreturn *dr) 2413 { 2414 __be32 status; 2415 2416 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 2417 goto out; 2418 2419 nfs4_lock_state(); 2420 status = nfs4_preprocess_stateid_op(&cstate->current_fh, 2421 &dr->dr_stateid, DELEG_RET, NULL); 2422 nfs4_unlock_state(); 2423 out: 2424 return status; 2425 } 2426 2427 2428 /* 2429 * Lock owner state (byte-range locks) 2430 */ 2431 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 2432 #define LOCK_HASH_BITS 8 2433 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 2434 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 2435 2436 #define lockownerid_hashval(id) \ 2437 ((id) & LOCK_HASH_MASK) 2438 2439 static inline unsigned int 2440 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 2441 struct xdr_netobj *ownername) 2442 { 2443 return (file_hashval(inode) + cl_id 2444 + opaque_hashval(ownername->data, ownername->len)) 2445 & LOCK_HASH_MASK; 2446 } 2447 2448 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 2449 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 2450 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 2451 2452 static struct nfs4_stateid * 2453 find_stateid(stateid_t *stid, int flags) 2454 { 2455 struct nfs4_stateid *local = NULL; 2456 u32 st_id = stid->si_stateownerid; 2457 u32 f_id = stid->si_fileid; 2458 unsigned int hashval; 2459 2460 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 2461 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) { 2462 hashval = stateid_hashval(st_id, f_id); 2463 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 2464 if ((local->st_stateid.si_stateownerid == st_id) && 2465 (local->st_stateid.si_fileid == f_id)) 2466 return local; 2467 } 2468 } 2469 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) { 2470 hashval = stateid_hashval(st_id, f_id); 2471 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 2472 if ((local->st_stateid.si_stateownerid == st_id) && 2473 (local->st_stateid.si_fileid == f_id)) 2474 return local; 2475 } 2476 } 2477 return NULL; 2478 } 2479 2480 static struct nfs4_delegation * 2481 find_delegation_stateid(struct inode *ino, stateid_t *stid) 2482 { 2483 struct nfs4_file *fp; 2484 struct nfs4_delegation *dl; 2485 2486 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n", 2487 stid->si_boot, stid->si_stateownerid, 2488 stid->si_fileid, stid->si_generation); 2489 2490 fp = find_file(ino); 2491 if (!fp) 2492 return NULL; 2493 dl = find_delegation_file(fp, stid); 2494 put_nfs4_file(fp); 2495 return dl; 2496 } 2497 2498 /* 2499 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 2500 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 2501 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 2502 * locking, this prevents us from being completely protocol-compliant. The 2503 * real solution to this problem is to start using unsigned file offsets in 2504 * the VFS, but this is a very deep change! 2505 */ 2506 static inline void 2507 nfs4_transform_lock_offset(struct file_lock *lock) 2508 { 2509 if (lock->fl_start < 0) 2510 lock->fl_start = OFFSET_MAX; 2511 if (lock->fl_end < 0) 2512 lock->fl_end = OFFSET_MAX; 2513 } 2514 2515 /* Hack!: For now, we're defining this just so we can use a pointer to it 2516 * as a unique cookie to identify our (NFSv4's) posix locks. */ 2517 static struct lock_manager_operations nfsd_posix_mng_ops = { 2518 }; 2519 2520 static inline void 2521 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 2522 { 2523 struct nfs4_stateowner *sop; 2524 unsigned int hval; 2525 2526 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 2527 sop = (struct nfs4_stateowner *) fl->fl_owner; 2528 hval = lockownerid_hashval(sop->so_id); 2529 kref_get(&sop->so_ref); 2530 deny->ld_sop = sop; 2531 deny->ld_clientid = sop->so_client->cl_clientid; 2532 } else { 2533 deny->ld_sop = NULL; 2534 deny->ld_clientid.cl_boot = 0; 2535 deny->ld_clientid.cl_id = 0; 2536 } 2537 deny->ld_start = fl->fl_start; 2538 deny->ld_length = ~(u64)0; 2539 if (fl->fl_end != ~(u64)0) 2540 deny->ld_length = fl->fl_end - fl->fl_start + 1; 2541 deny->ld_type = NFS4_READ_LT; 2542 if (fl->fl_type != F_RDLCK) 2543 deny->ld_type = NFS4_WRITE_LT; 2544 } 2545 2546 static struct nfs4_stateowner * 2547 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 2548 struct xdr_netobj *owner) 2549 { 2550 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 2551 struct nfs4_stateowner *op; 2552 2553 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 2554 if (same_owner_str(op, owner, clid)) 2555 return op; 2556 } 2557 return NULL; 2558 } 2559 2560 /* 2561 * Alloc a lock owner structure. 2562 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 2563 * occured. 2564 * 2565 * strhashval = lock_ownerstr_hashval 2566 */ 2567 2568 static struct nfs4_stateowner * 2569 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 2570 struct nfs4_stateowner *sop; 2571 struct nfs4_replay *rp; 2572 unsigned int idhashval; 2573 2574 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 2575 return NULL; 2576 idhashval = lockownerid_hashval(current_ownerid); 2577 INIT_LIST_HEAD(&sop->so_idhash); 2578 INIT_LIST_HEAD(&sop->so_strhash); 2579 INIT_LIST_HEAD(&sop->so_perclient); 2580 INIT_LIST_HEAD(&sop->so_stateids); 2581 INIT_LIST_HEAD(&sop->so_perstateid); 2582 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 2583 sop->so_time = 0; 2584 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 2585 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 2586 list_add(&sop->so_perstateid, &open_stp->st_lockowners); 2587 sop->so_is_open_owner = 0; 2588 sop->so_id = current_ownerid++; 2589 sop->so_client = clp; 2590 /* It is the openowner seqid that will be incremented in encode in the 2591 * case of new lockowners; so increment the lock seqid manually: */ 2592 sop->so_seqid = lock->lk_new_lock_seqid + 1; 2593 sop->so_confirmed = 1; 2594 rp = &sop->so_replay; 2595 rp->rp_status = nfserr_serverfault; 2596 rp->rp_buflen = 0; 2597 rp->rp_buf = rp->rp_ibuf; 2598 return sop; 2599 } 2600 2601 static struct nfs4_stateid * 2602 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 2603 { 2604 struct nfs4_stateid *stp; 2605 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 2606 2607 stp = nfs4_alloc_stateid(); 2608 if (stp == NULL) 2609 goto out; 2610 INIT_LIST_HEAD(&stp->st_hash); 2611 INIT_LIST_HEAD(&stp->st_perfile); 2612 INIT_LIST_HEAD(&stp->st_perstateowner); 2613 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ 2614 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 2615 list_add(&stp->st_perfile, &fp->fi_stateids); 2616 list_add(&stp->st_perstateowner, &sop->so_stateids); 2617 stp->st_stateowner = sop; 2618 get_nfs4_file(fp); 2619 stp->st_file = fp; 2620 stp->st_stateid.si_boot = boot_time; 2621 stp->st_stateid.si_stateownerid = sop->so_id; 2622 stp->st_stateid.si_fileid = fp->fi_id; 2623 stp->st_stateid.si_generation = 0; 2624 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */ 2625 stp->st_access_bmap = open_stp->st_access_bmap; 2626 stp->st_deny_bmap = open_stp->st_deny_bmap; 2627 stp->st_openstp = open_stp; 2628 2629 out: 2630 return stp; 2631 } 2632 2633 static int 2634 check_lock_length(u64 offset, u64 length) 2635 { 2636 return ((length == 0) || ((length != ~(u64)0) && 2637 LOFF_OVERFLOW(offset, length))); 2638 } 2639 2640 /* 2641 * LOCK operation 2642 */ 2643 __be32 2644 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2645 struct nfsd4_lock *lock) 2646 { 2647 struct nfs4_stateowner *open_sop = NULL; 2648 struct nfs4_stateowner *lock_sop = NULL; 2649 struct nfs4_stateid *lock_stp; 2650 struct file *filp; 2651 struct file_lock file_lock; 2652 struct file_lock conflock; 2653 __be32 status = 0; 2654 unsigned int strhashval; 2655 unsigned int cmd; 2656 int err; 2657 2658 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 2659 (long long) lock->lk_offset, 2660 (long long) lock->lk_length); 2661 2662 if (check_lock_length(lock->lk_offset, lock->lk_length)) 2663 return nfserr_inval; 2664 2665 if ((status = fh_verify(rqstp, &cstate->current_fh, 2666 S_IFREG, MAY_LOCK))) { 2667 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 2668 return status; 2669 } 2670 2671 nfs4_lock_state(); 2672 2673 if (lock->lk_is_new) { 2674 /* 2675 * Client indicates that this is a new lockowner. 2676 * Use open owner and open stateid to create lock owner and 2677 * lock stateid. 2678 */ 2679 struct nfs4_stateid *open_stp = NULL; 2680 struct nfs4_file *fp; 2681 2682 status = nfserr_stale_clientid; 2683 if (STALE_CLIENTID(&lock->lk_new_clientid)) 2684 goto out; 2685 2686 /* validate and update open stateid and open seqid */ 2687 status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2688 lock->lk_new_open_seqid, 2689 &lock->lk_new_open_stateid, 2690 CHECK_FH | OPEN_STATE, 2691 &lock->lk_replay_owner, &open_stp, 2692 lock); 2693 if (status) 2694 goto out; 2695 open_sop = lock->lk_replay_owner; 2696 /* create lockowner and lock stateid */ 2697 fp = open_stp->st_file; 2698 strhashval = lock_ownerstr_hashval(fp->fi_inode, 2699 open_sop->so_client->cl_clientid.cl_id, 2700 &lock->v.new.owner); 2701 /* XXX: Do we need to check for duplicate stateowners on 2702 * the same file, or should they just be allowed (and 2703 * create new stateids)? */ 2704 status = nfserr_resource; 2705 lock_sop = alloc_init_lock_stateowner(strhashval, 2706 open_sop->so_client, open_stp, lock); 2707 if (lock_sop == NULL) 2708 goto out; 2709 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); 2710 if (lock_stp == NULL) 2711 goto out; 2712 } else { 2713 /* lock (lock owner + lock stateid) already exists */ 2714 status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2715 lock->lk_old_lock_seqid, 2716 &lock->lk_old_lock_stateid, 2717 CHECK_FH | LOCK_STATE, 2718 &lock->lk_replay_owner, &lock_stp, lock); 2719 if (status) 2720 goto out; 2721 lock_sop = lock->lk_replay_owner; 2722 } 2723 /* lock->lk_replay_owner and lock_stp have been created or found */ 2724 filp = lock_stp->st_vfs_file; 2725 2726 status = nfserr_grace; 2727 if (nfs4_in_grace() && !lock->lk_reclaim) 2728 goto out; 2729 status = nfserr_no_grace; 2730 if (!nfs4_in_grace() && lock->lk_reclaim) 2731 goto out; 2732 2733 locks_init_lock(&file_lock); 2734 switch (lock->lk_type) { 2735 case NFS4_READ_LT: 2736 case NFS4_READW_LT: 2737 file_lock.fl_type = F_RDLCK; 2738 cmd = F_SETLK; 2739 break; 2740 case NFS4_WRITE_LT: 2741 case NFS4_WRITEW_LT: 2742 file_lock.fl_type = F_WRLCK; 2743 cmd = F_SETLK; 2744 break; 2745 default: 2746 status = nfserr_inval; 2747 goto out; 2748 } 2749 file_lock.fl_owner = (fl_owner_t)lock_sop; 2750 file_lock.fl_pid = current->tgid; 2751 file_lock.fl_file = filp; 2752 file_lock.fl_flags = FL_POSIX; 2753 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2754 2755 file_lock.fl_start = lock->lk_offset; 2756 if ((lock->lk_length == ~(u64)0) || 2757 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length)) 2758 file_lock.fl_end = ~(u64)0; 2759 else 2760 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1; 2761 nfs4_transform_lock_offset(&file_lock); 2762 2763 /* 2764 * Try to lock the file in the VFS. 2765 * Note: locks.c uses the BKL to protect the inode's lock list. 2766 */ 2767 2768 /* XXX?: Just to divert the locks_release_private at the start of 2769 * locks_copy_lock: */ 2770 locks_init_lock(&conflock); 2771 err = vfs_lock_file(filp, cmd, &file_lock, &conflock); 2772 switch (-err) { 2773 case 0: /* success! */ 2774 update_stateid(&lock_stp->st_stateid); 2775 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 2776 sizeof(stateid_t)); 2777 status = 0; 2778 break; 2779 case (EAGAIN): /* conflock holds conflicting lock */ 2780 status = nfserr_denied; 2781 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 2782 nfs4_set_lock_denied(&conflock, &lock->lk_denied); 2783 break; 2784 case (EDEADLK): 2785 status = nfserr_deadlock; 2786 break; 2787 default: 2788 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); 2789 status = nfserr_resource; 2790 break; 2791 } 2792 out: 2793 if (status && lock->lk_is_new && lock_sop) 2794 release_stateowner(lock_sop); 2795 if (lock->lk_replay_owner) { 2796 nfs4_get_stateowner(lock->lk_replay_owner); 2797 cstate->replay_owner = lock->lk_replay_owner; 2798 } 2799 nfs4_unlock_state(); 2800 return status; 2801 } 2802 2803 /* 2804 * LOCKT operation 2805 */ 2806 __be32 2807 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2808 struct nfsd4_lockt *lockt) 2809 { 2810 struct inode *inode; 2811 struct file file; 2812 struct file_lock file_lock; 2813 int error; 2814 __be32 status; 2815 2816 if (nfs4_in_grace()) 2817 return nfserr_grace; 2818 2819 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 2820 return nfserr_inval; 2821 2822 lockt->lt_stateowner = NULL; 2823 nfs4_lock_state(); 2824 2825 status = nfserr_stale_clientid; 2826 if (STALE_CLIENTID(&lockt->lt_clientid)) 2827 goto out; 2828 2829 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) { 2830 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 2831 if (status == nfserr_symlink) 2832 status = nfserr_inval; 2833 goto out; 2834 } 2835 2836 inode = cstate->current_fh.fh_dentry->d_inode; 2837 locks_init_lock(&file_lock); 2838 switch (lockt->lt_type) { 2839 case NFS4_READ_LT: 2840 case NFS4_READW_LT: 2841 file_lock.fl_type = F_RDLCK; 2842 break; 2843 case NFS4_WRITE_LT: 2844 case NFS4_WRITEW_LT: 2845 file_lock.fl_type = F_WRLCK; 2846 break; 2847 default: 2848 dprintk("NFSD: nfs4_lockt: bad lock type!\n"); 2849 status = nfserr_inval; 2850 goto out; 2851 } 2852 2853 lockt->lt_stateowner = find_lockstateowner_str(inode, 2854 &lockt->lt_clientid, &lockt->lt_owner); 2855 if (lockt->lt_stateowner) 2856 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 2857 file_lock.fl_pid = current->tgid; 2858 file_lock.fl_flags = FL_POSIX; 2859 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2860 2861 file_lock.fl_start = lockt->lt_offset; 2862 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length)) 2863 file_lock.fl_end = ~(u64)0; 2864 else 2865 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1; 2866 2867 nfs4_transform_lock_offset(&file_lock); 2868 2869 /* vfs_test_lock uses the struct file _only_ to resolve the inode. 2870 * since LOCKT doesn't require an OPEN, and therefore a struct 2871 * file may not exist, pass vfs_test_lock a struct file with 2872 * only the dentry:inode set. 2873 */ 2874 memset(&file, 0, sizeof (struct file)); 2875 file.f_path.dentry = cstate->current_fh.fh_dentry; 2876 2877 status = nfs_ok; 2878 error = vfs_test_lock(&file, &file_lock); 2879 if (error) { 2880 status = nfserrno(error); 2881 goto out; 2882 } 2883 if (file_lock.fl_type != F_UNLCK) { 2884 status = nfserr_denied; 2885 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); 2886 } 2887 out: 2888 nfs4_unlock_state(); 2889 return status; 2890 } 2891 2892 __be32 2893 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2894 struct nfsd4_locku *locku) 2895 { 2896 struct nfs4_stateid *stp; 2897 struct file *filp = NULL; 2898 struct file_lock file_lock; 2899 __be32 status; 2900 int err; 2901 2902 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 2903 (long long) locku->lu_offset, 2904 (long long) locku->lu_length); 2905 2906 if (check_lock_length(locku->lu_offset, locku->lu_length)) 2907 return nfserr_inval; 2908 2909 nfs4_lock_state(); 2910 2911 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh, 2912 locku->lu_seqid, 2913 &locku->lu_stateid, 2914 CHECK_FH | LOCK_STATE, 2915 &locku->lu_stateowner, &stp, NULL))) 2916 goto out; 2917 2918 filp = stp->st_vfs_file; 2919 BUG_ON(!filp); 2920 locks_init_lock(&file_lock); 2921 file_lock.fl_type = F_UNLCK; 2922 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 2923 file_lock.fl_pid = current->tgid; 2924 file_lock.fl_file = filp; 2925 file_lock.fl_flags = FL_POSIX; 2926 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2927 file_lock.fl_start = locku->lu_offset; 2928 2929 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length)) 2930 file_lock.fl_end = ~(u64)0; 2931 else 2932 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1; 2933 nfs4_transform_lock_offset(&file_lock); 2934 2935 /* 2936 * Try to unlock the file in the VFS. 2937 */ 2938 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); 2939 if (err) { 2940 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); 2941 goto out_nfserr; 2942 } 2943 /* 2944 * OK, unlock succeeded; the only thing left to do is update the stateid. 2945 */ 2946 update_stateid(&stp->st_stateid); 2947 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 2948 2949 out: 2950 if (locku->lu_stateowner) { 2951 nfs4_get_stateowner(locku->lu_stateowner); 2952 cstate->replay_owner = locku->lu_stateowner; 2953 } 2954 nfs4_unlock_state(); 2955 return status; 2956 2957 out_nfserr: 2958 status = nfserrno(err); 2959 goto out; 2960 } 2961 2962 /* 2963 * returns 2964 * 1: locks held by lockowner 2965 * 0: no locks held by lockowner 2966 */ 2967 static int 2968 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner) 2969 { 2970 struct file_lock **flpp; 2971 struct inode *inode = filp->f_path.dentry->d_inode; 2972 int status = 0; 2973 2974 lock_kernel(); 2975 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 2976 if ((*flpp)->fl_owner == (fl_owner_t)lowner) { 2977 status = 1; 2978 goto out; 2979 } 2980 } 2981 out: 2982 unlock_kernel(); 2983 return status; 2984 } 2985 2986 __be32 2987 nfsd4_release_lockowner(struct svc_rqst *rqstp, 2988 struct nfsd4_compound_state *cstate, 2989 struct nfsd4_release_lockowner *rlockowner) 2990 { 2991 clientid_t *clid = &rlockowner->rl_clientid; 2992 struct nfs4_stateowner *sop; 2993 struct nfs4_stateid *stp; 2994 struct xdr_netobj *owner = &rlockowner->rl_owner; 2995 struct list_head matches; 2996 int i; 2997 __be32 status; 2998 2999 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 3000 clid->cl_boot, clid->cl_id); 3001 3002 /* XXX check for lease expiration */ 3003 3004 status = nfserr_stale_clientid; 3005 if (STALE_CLIENTID(clid)) 3006 return status; 3007 3008 nfs4_lock_state(); 3009 3010 status = nfserr_locks_held; 3011 /* XXX: we're doing a linear search through all the lockowners. 3012 * Yipes! For now we'll just hope clients aren't really using 3013 * release_lockowner much, but eventually we have to fix these 3014 * data structures. */ 3015 INIT_LIST_HEAD(&matches); 3016 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3017 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { 3018 if (!same_owner_str(sop, owner, clid)) 3019 continue; 3020 list_for_each_entry(stp, &sop->so_stateids, 3021 st_perstateowner) { 3022 if (check_for_locks(stp->st_vfs_file, sop)) 3023 goto out; 3024 /* Note: so_perclient unused for lockowners, 3025 * so it's OK to fool with here. */ 3026 list_add(&sop->so_perclient, &matches); 3027 } 3028 } 3029 } 3030 /* Clients probably won't expect us to return with some (but not all) 3031 * of the lockowner state released; so don't release any until all 3032 * have been checked. */ 3033 status = nfs_ok; 3034 while (!list_empty(&matches)) { 3035 sop = list_entry(matches.next, struct nfs4_stateowner, 3036 so_perclient); 3037 /* unhash_stateowner deletes so_perclient only 3038 * for openowners. */ 3039 list_del(&sop->so_perclient); 3040 release_stateowner(sop); 3041 } 3042 out: 3043 nfs4_unlock_state(); 3044 return status; 3045 } 3046 3047 static inline struct nfs4_client_reclaim * 3048 alloc_reclaim(void) 3049 { 3050 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 3051 } 3052 3053 int 3054 nfs4_has_reclaimed_state(const char *name) 3055 { 3056 unsigned int strhashval = clientstr_hashval(name); 3057 struct nfs4_client *clp; 3058 3059 clp = find_confirmed_client_by_str(name, strhashval); 3060 return clp ? 1 : 0; 3061 } 3062 3063 /* 3064 * failure => all reset bets are off, nfserr_no_grace... 3065 */ 3066 int 3067 nfs4_client_to_reclaim(const char *name) 3068 { 3069 unsigned int strhashval; 3070 struct nfs4_client_reclaim *crp = NULL; 3071 3072 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 3073 crp = alloc_reclaim(); 3074 if (!crp) 3075 return 0; 3076 strhashval = clientstr_hashval(name); 3077 INIT_LIST_HEAD(&crp->cr_strhash); 3078 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 3079 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 3080 reclaim_str_hashtbl_size++; 3081 return 1; 3082 } 3083 3084 static void 3085 nfs4_release_reclaim(void) 3086 { 3087 struct nfs4_client_reclaim *crp = NULL; 3088 int i; 3089 3090 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3091 while (!list_empty(&reclaim_str_hashtbl[i])) { 3092 crp = list_entry(reclaim_str_hashtbl[i].next, 3093 struct nfs4_client_reclaim, cr_strhash); 3094 list_del(&crp->cr_strhash); 3095 kfree(crp); 3096 reclaim_str_hashtbl_size--; 3097 } 3098 } 3099 BUG_ON(reclaim_str_hashtbl_size); 3100 } 3101 3102 /* 3103 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 3104 static struct nfs4_client_reclaim * 3105 nfs4_find_reclaim_client(clientid_t *clid) 3106 { 3107 unsigned int strhashval; 3108 struct nfs4_client *clp; 3109 struct nfs4_client_reclaim *crp = NULL; 3110 3111 3112 /* find clientid in conf_id_hashtbl */ 3113 clp = find_confirmed_client(clid); 3114 if (clp == NULL) 3115 return NULL; 3116 3117 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", 3118 clp->cl_name.len, clp->cl_name.data, 3119 clp->cl_recdir); 3120 3121 /* find clp->cl_name in reclaim_str_hashtbl */ 3122 strhashval = clientstr_hashval(clp->cl_recdir); 3123 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 3124 if (same_name(crp->cr_recdir, clp->cl_recdir)) { 3125 return crp; 3126 } 3127 } 3128 return NULL; 3129 } 3130 3131 /* 3132 * Called from OPEN. Look for clientid in reclaim list. 3133 */ 3134 __be32 3135 nfs4_check_open_reclaim(clientid_t *clid) 3136 { 3137 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; 3138 } 3139 3140 /* initialization to perform at module load time: */ 3141 3142 int 3143 nfs4_state_init(void) 3144 { 3145 int i, status; 3146 3147 status = nfsd4_init_slabs(); 3148 if (status) 3149 return status; 3150 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3151 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 3152 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 3153 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 3154 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 3155 } 3156 for (i = 0; i < FILE_HASH_SIZE; i++) { 3157 INIT_LIST_HEAD(&file_hashtbl[i]); 3158 } 3159 for (i = 0; i < OWNER_HASH_SIZE; i++) { 3160 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 3161 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 3162 } 3163 for (i = 0; i < STATEID_HASH_SIZE; i++) { 3164 INIT_LIST_HEAD(&stateid_hashtbl[i]); 3165 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 3166 } 3167 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3168 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 3169 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 3170 } 3171 memset(&onestateid, ~0, sizeof(stateid_t)); 3172 INIT_LIST_HEAD(&close_lru); 3173 INIT_LIST_HEAD(&client_lru); 3174 INIT_LIST_HEAD(&del_recall_lru); 3175 for (i = 0; i < CLIENT_HASH_SIZE; i++) 3176 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 3177 reclaim_str_hashtbl_size = 0; 3178 return 0; 3179 } 3180 3181 static void 3182 nfsd4_load_reboot_recovery_data(void) 3183 { 3184 int status; 3185 3186 nfs4_lock_state(); 3187 nfsd4_init_recdir(user_recovery_dirname); 3188 status = nfsd4_recdir_load(); 3189 nfs4_unlock_state(); 3190 if (status) 3191 printk("NFSD: Failure reading reboot recovery data\n"); 3192 } 3193 3194 unsigned long 3195 get_nfs4_grace_period(void) 3196 { 3197 return max(user_lease_time, lease_time) * HZ; 3198 } 3199 3200 /* 3201 * Since the lifetime of a delegation isn't limited to that of an open, a 3202 * client may quite reasonably hang on to a delegation as long as it has 3203 * the inode cached. This becomes an obvious problem the first time a 3204 * client's inode cache approaches the size of the server's total memory. 3205 * 3206 * For now we avoid this problem by imposing a hard limit on the number 3207 * of delegations, which varies according to the server's memory size. 3208 */ 3209 static void 3210 set_max_delegations(void) 3211 { 3212 /* 3213 * Allow at most 4 delegations per megabyte of RAM. Quick 3214 * estimates suggest that in the worst case (where every delegation 3215 * is for a different inode), a delegation could take about 1.5K, 3216 * giving a worst case usage of about 6% of memory. 3217 */ 3218 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); 3219 } 3220 3221 /* initialization to perform when the nfsd service is started: */ 3222 3223 static void 3224 __nfs4_state_start(void) 3225 { 3226 unsigned long grace_time; 3227 3228 boot_time = get_seconds(); 3229 grace_time = get_nfs_grace_period(); 3230 lease_time = user_lease_time; 3231 in_grace = 1; 3232 printk(KERN_INFO "NFSD: starting %ld-second grace period\n", 3233 grace_time/HZ); 3234 laundry_wq = create_singlethread_workqueue("nfsd4"); 3235 queue_delayed_work(laundry_wq, &laundromat_work, grace_time); 3236 set_max_delegations(); 3237 } 3238 3239 void 3240 nfs4_state_start(void) 3241 { 3242 if (nfs4_init) 3243 return; 3244 nfsd4_load_reboot_recovery_data(); 3245 __nfs4_state_start(); 3246 nfs4_init = 1; 3247 return; 3248 } 3249 3250 int 3251 nfs4_in_grace(void) 3252 { 3253 return in_grace; 3254 } 3255 3256 time_t 3257 nfs4_lease_time(void) 3258 { 3259 return lease_time; 3260 } 3261 3262 static void 3263 __nfs4_state_shutdown(void) 3264 { 3265 int i; 3266 struct nfs4_client *clp = NULL; 3267 struct nfs4_delegation *dp = NULL; 3268 struct list_head *pos, *next, reaplist; 3269 3270 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3271 while (!list_empty(&conf_id_hashtbl[i])) { 3272 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 3273 expire_client(clp); 3274 } 3275 while (!list_empty(&unconf_str_hashtbl[i])) { 3276 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 3277 expire_client(clp); 3278 } 3279 } 3280 INIT_LIST_HEAD(&reaplist); 3281 spin_lock(&recall_lock); 3282 list_for_each_safe(pos, next, &del_recall_lru) { 3283 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3284 list_move(&dp->dl_recall_lru, &reaplist); 3285 } 3286 spin_unlock(&recall_lock); 3287 list_for_each_safe(pos, next, &reaplist) { 3288 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3289 list_del_init(&dp->dl_recall_lru); 3290 unhash_delegation(dp); 3291 } 3292 3293 nfsd4_shutdown_recdir(); 3294 nfs4_init = 0; 3295 } 3296 3297 void 3298 nfs4_state_shutdown(void) 3299 { 3300 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); 3301 destroy_workqueue(laundry_wq); 3302 nfs4_lock_state(); 3303 nfs4_release_reclaim(); 3304 __nfs4_state_shutdown(); 3305 nfs4_unlock_state(); 3306 } 3307 3308 static void 3309 nfs4_set_recdir(char *recdir) 3310 { 3311 nfs4_lock_state(); 3312 strcpy(user_recovery_dirname, recdir); 3313 nfs4_unlock_state(); 3314 } 3315 3316 /* 3317 * Change the NFSv4 recovery directory to recdir. 3318 */ 3319 int 3320 nfs4_reset_recoverydir(char *recdir) 3321 { 3322 int status; 3323 struct nameidata nd; 3324 3325 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd); 3326 if (status) 3327 return status; 3328 status = -ENOTDIR; 3329 if (S_ISDIR(nd.dentry->d_inode->i_mode)) { 3330 nfs4_set_recdir(recdir); 3331 status = 0; 3332 } 3333 path_release(&nd); 3334 return status; 3335 } 3336 3337 /* 3338 * Called when leasetime is changed. 3339 * 3340 * The only way the protocol gives us to handle on-the-fly lease changes is to 3341 * simulate a reboot. Instead of doing that, we just wait till the next time 3342 * we start to register any changes in lease time. If the administrator 3343 * really wants to change the lease time *now*, they can go ahead and bring 3344 * nfsd down and then back up again after changing the lease time. 3345 */ 3346 void 3347 nfs4_reset_lease(time_t leasetime) 3348 { 3349 lock_kernel(); 3350 user_lease_time = leasetime; 3351 unlock_kernel(); 3352 } 3353