1 /* 2 * linux/fs/nfsd/nfs4state.c 3 * 4 * Copyright (c) 2001 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Kendrick Smith <kmsmith@umich.edu> 8 * Andy Adamson <kandros@umich.edu> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 * 35 */ 36 37 #include <linux/param.h> 38 #include <linux/major.h> 39 #include <linux/slab.h> 40 41 #include <linux/sunrpc/svc.h> 42 #include <linux/nfsd/nfsd.h> 43 #include <linux/nfsd/cache.h> 44 #include <linux/mount.h> 45 #include <linux/workqueue.h> 46 #include <linux/smp_lock.h> 47 #include <linux/kthread.h> 48 #include <linux/nfs4.h> 49 #include <linux/nfsd/state.h> 50 #include <linux/nfsd/xdr4.h> 51 #include <linux/namei.h> 52 #include <linux/mutex.h> 53 54 #define NFSDDBG_FACILITY NFSDDBG_PROC 55 56 /* Globals */ 57 static time_t lease_time = 90; /* default lease time */ 58 static time_t user_lease_time = 90; 59 static time_t boot_time; 60 static int in_grace = 1; 61 static u32 current_clientid = 1; 62 static u32 current_ownerid = 1; 63 static u32 current_fileid = 1; 64 static u32 current_delegid = 1; 65 static u32 nfs4_init; 66 static stateid_t zerostateid; /* bits all 0 */ 67 static stateid_t onestateid; /* bits all 1 */ 68 69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t))) 70 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t))) 71 72 /* forward declarations */ 73 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); 74 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); 75 static void release_stateid_lockowners(struct nfs4_stateid *open_stp); 76 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; 77 static void nfs4_set_recdir(char *recdir); 78 79 /* Locking: 80 * 81 * client_mutex: 82 * protects clientid_hashtbl[], clientstr_hashtbl[], 83 * unconfstr_hashtbl[], uncofid_hashtbl[]. 84 */ 85 static DEFINE_MUTEX(client_mutex); 86 87 static kmem_cache_t *stateowner_slab = NULL; 88 static kmem_cache_t *file_slab = NULL; 89 static kmem_cache_t *stateid_slab = NULL; 90 static kmem_cache_t *deleg_slab = NULL; 91 92 void 93 nfs4_lock_state(void) 94 { 95 mutex_lock(&client_mutex); 96 } 97 98 void 99 nfs4_unlock_state(void) 100 { 101 mutex_unlock(&client_mutex); 102 } 103 104 static inline u32 105 opaque_hashval(const void *ptr, int nbytes) 106 { 107 unsigned char *cptr = (unsigned char *) ptr; 108 109 u32 x = 0; 110 while (nbytes--) { 111 x *= 37; 112 x += *cptr++; 113 } 114 return x; 115 } 116 117 /* forward declarations */ 118 static void release_stateowner(struct nfs4_stateowner *sop); 119 static void release_stateid(struct nfs4_stateid *stp, int flags); 120 121 /* 122 * Delegation state 123 */ 124 125 /* recall_lock protects the del_recall_lru */ 126 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED; 127 static struct list_head del_recall_lru; 128 129 static void 130 free_nfs4_file(struct kref *kref) 131 { 132 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref); 133 list_del(&fp->fi_hash); 134 iput(fp->fi_inode); 135 kmem_cache_free(file_slab, fp); 136 } 137 138 static inline void 139 put_nfs4_file(struct nfs4_file *fi) 140 { 141 kref_put(&fi->fi_ref, free_nfs4_file); 142 } 143 144 static inline void 145 get_nfs4_file(struct nfs4_file *fi) 146 { 147 kref_get(&fi->fi_ref); 148 } 149 150 static int num_delegations; 151 152 /* 153 * Open owner state (share locks) 154 */ 155 156 /* hash tables for nfs4_stateowner */ 157 #define OWNER_HASH_BITS 8 158 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 159 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 160 161 #define ownerid_hashval(id) \ 162 ((id) & OWNER_HASH_MASK) 163 #define ownerstr_hashval(clientid, ownername) \ 164 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 165 166 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 167 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 168 169 /* hash table for nfs4_file */ 170 #define FILE_HASH_BITS 8 171 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 172 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 173 /* hash table for (open)nfs4_stateid */ 174 #define STATEID_HASH_BITS 10 175 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 176 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 177 178 #define file_hashval(x) \ 179 hash_ptr(x, FILE_HASH_BITS) 180 #define stateid_hashval(owner_id, file_id) \ 181 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 182 183 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 184 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 185 186 static struct nfs4_delegation * 187 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 188 { 189 struct nfs4_delegation *dp; 190 struct nfs4_file *fp = stp->st_file; 191 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback; 192 193 dprintk("NFSD alloc_init_deleg\n"); 194 if (num_delegations > STATEID_HASH_SIZE * 4) 195 return NULL; 196 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); 197 if (dp == NULL) 198 return dp; 199 num_delegations++; 200 INIT_LIST_HEAD(&dp->dl_perfile); 201 INIT_LIST_HEAD(&dp->dl_perclnt); 202 INIT_LIST_HEAD(&dp->dl_recall_lru); 203 dp->dl_client = clp; 204 get_nfs4_file(fp); 205 dp->dl_file = fp; 206 dp->dl_flock = NULL; 207 get_file(stp->st_vfs_file); 208 dp->dl_vfs_file = stp->st_vfs_file; 209 dp->dl_type = type; 210 dp->dl_recall.cbr_dp = NULL; 211 dp->dl_recall.cbr_ident = cb->cb_ident; 212 dp->dl_recall.cbr_trunc = 0; 213 dp->dl_stateid.si_boot = boot_time; 214 dp->dl_stateid.si_stateownerid = current_delegid++; 215 dp->dl_stateid.si_fileid = 0; 216 dp->dl_stateid.si_generation = 0; 217 dp->dl_fhlen = current_fh->fh_handle.fh_size; 218 memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base, 219 current_fh->fh_handle.fh_size); 220 dp->dl_time = 0; 221 atomic_set(&dp->dl_count, 1); 222 list_add(&dp->dl_perfile, &fp->fi_delegations); 223 list_add(&dp->dl_perclnt, &clp->cl_delegations); 224 return dp; 225 } 226 227 void 228 nfs4_put_delegation(struct nfs4_delegation *dp) 229 { 230 if (atomic_dec_and_test(&dp->dl_count)) { 231 dprintk("NFSD: freeing dp %p\n",dp); 232 put_nfs4_file(dp->dl_file); 233 kmem_cache_free(deleg_slab, dp); 234 num_delegations--; 235 } 236 } 237 238 /* Remove the associated file_lock first, then remove the delegation. 239 * lease_modify() is called to remove the FS_LEASE file_lock from 240 * the i_flock list, eventually calling nfsd's lock_manager 241 * fl_release_callback. 242 */ 243 static void 244 nfs4_close_delegation(struct nfs4_delegation *dp) 245 { 246 struct file *filp = dp->dl_vfs_file; 247 248 dprintk("NFSD: close_delegation dp %p\n",dp); 249 dp->dl_vfs_file = NULL; 250 /* The following nfsd_close may not actually close the file, 251 * but we want to remove the lease in any case. */ 252 if (dp->dl_flock) 253 setlease(filp, F_UNLCK, &dp->dl_flock); 254 nfsd_close(filp); 255 } 256 257 /* Called under the state lock. */ 258 static void 259 unhash_delegation(struct nfs4_delegation *dp) 260 { 261 list_del_init(&dp->dl_perfile); 262 list_del_init(&dp->dl_perclnt); 263 spin_lock(&recall_lock); 264 list_del_init(&dp->dl_recall_lru); 265 spin_unlock(&recall_lock); 266 nfs4_close_delegation(dp); 267 nfs4_put_delegation(dp); 268 } 269 270 /* 271 * SETCLIENTID state 272 */ 273 274 /* Hash tables for nfs4_clientid state */ 275 #define CLIENT_HASH_BITS 4 276 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 277 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 278 279 #define clientid_hashval(id) \ 280 ((id) & CLIENT_HASH_MASK) 281 #define clientstr_hashval(name) \ 282 (opaque_hashval((name), 8) & CLIENT_HASH_MASK) 283 /* 284 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 285 * used in reboot/reset lease grace period processing 286 * 287 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 288 * setclientid_confirmed info. 289 * 290 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 291 * setclientid info. 292 * 293 * client_lru holds client queue ordered by nfs4_client.cl_time 294 * for lease renewal. 295 * 296 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 297 * for last close replay. 298 */ 299 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 300 static int reclaim_str_hashtbl_size = 0; 301 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 302 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 303 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 304 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 305 static struct list_head client_lru; 306 static struct list_head close_lru; 307 308 static inline void 309 renew_client(struct nfs4_client *clp) 310 { 311 /* 312 * Move client to the end to the LRU list. 313 */ 314 dprintk("renewing client (clientid %08x/%08x)\n", 315 clp->cl_clientid.cl_boot, 316 clp->cl_clientid.cl_id); 317 list_move_tail(&clp->cl_lru, &client_lru); 318 clp->cl_time = get_seconds(); 319 } 320 321 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 322 static int 323 STALE_CLIENTID(clientid_t *clid) 324 { 325 if (clid->cl_boot == boot_time) 326 return 0; 327 dprintk("NFSD stale clientid (%08x/%08x)\n", 328 clid->cl_boot, clid->cl_id); 329 return 1; 330 } 331 332 /* 333 * XXX Should we use a slab cache ? 334 * This type of memory management is somewhat inefficient, but we use it 335 * anyway since SETCLIENTID is not a common operation. 336 */ 337 static inline struct nfs4_client * 338 alloc_client(struct xdr_netobj name) 339 { 340 struct nfs4_client *clp; 341 342 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) { 343 memset(clp, 0, sizeof(*clp)); 344 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) { 345 memcpy(clp->cl_name.data, name.data, name.len); 346 clp->cl_name.len = name.len; 347 } 348 else { 349 kfree(clp); 350 clp = NULL; 351 } 352 } 353 return clp; 354 } 355 356 static inline void 357 free_client(struct nfs4_client *clp) 358 { 359 if (clp->cl_cred.cr_group_info) 360 put_group_info(clp->cl_cred.cr_group_info); 361 kfree(clp->cl_name.data); 362 kfree(clp); 363 } 364 365 void 366 put_nfs4_client(struct nfs4_client *clp) 367 { 368 if (atomic_dec_and_test(&clp->cl_count)) 369 free_client(clp); 370 } 371 372 static void 373 shutdown_callback_client(struct nfs4_client *clp) 374 { 375 struct rpc_clnt *clnt = clp->cl_callback.cb_client; 376 377 /* shutdown rpc client, ending any outstanding recall rpcs */ 378 if (clnt) { 379 clp->cl_callback.cb_client = NULL; 380 rpc_shutdown_client(clnt); 381 rpciod_down(); 382 } 383 } 384 385 static void 386 expire_client(struct nfs4_client *clp) 387 { 388 struct nfs4_stateowner *sop; 389 struct nfs4_delegation *dp; 390 struct list_head reaplist; 391 392 dprintk("NFSD: expire_client cl_count %d\n", 393 atomic_read(&clp->cl_count)); 394 395 shutdown_callback_client(clp); 396 397 INIT_LIST_HEAD(&reaplist); 398 spin_lock(&recall_lock); 399 while (!list_empty(&clp->cl_delegations)) { 400 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 401 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 402 dp->dl_flock); 403 list_del_init(&dp->dl_perclnt); 404 list_move(&dp->dl_recall_lru, &reaplist); 405 } 406 spin_unlock(&recall_lock); 407 while (!list_empty(&reaplist)) { 408 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 409 list_del_init(&dp->dl_recall_lru); 410 unhash_delegation(dp); 411 } 412 list_del(&clp->cl_idhash); 413 list_del(&clp->cl_strhash); 414 list_del(&clp->cl_lru); 415 while (!list_empty(&clp->cl_openowners)) { 416 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); 417 release_stateowner(sop); 418 } 419 put_nfs4_client(clp); 420 } 421 422 static struct nfs4_client * 423 create_client(struct xdr_netobj name, char *recdir) { 424 struct nfs4_client *clp; 425 426 if (!(clp = alloc_client(name))) 427 goto out; 428 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); 429 atomic_set(&clp->cl_count, 1); 430 atomic_set(&clp->cl_callback.cb_set, 0); 431 INIT_LIST_HEAD(&clp->cl_idhash); 432 INIT_LIST_HEAD(&clp->cl_strhash); 433 INIT_LIST_HEAD(&clp->cl_openowners); 434 INIT_LIST_HEAD(&clp->cl_delegations); 435 INIT_LIST_HEAD(&clp->cl_lru); 436 out: 437 return clp; 438 } 439 440 static void 441 copy_verf(struct nfs4_client *target, nfs4_verifier *source) { 442 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data)); 443 } 444 445 static void 446 copy_clid(struct nfs4_client *target, struct nfs4_client *source) { 447 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 448 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 449 } 450 451 static void 452 copy_cred(struct svc_cred *target, struct svc_cred *source) { 453 454 target->cr_uid = source->cr_uid; 455 target->cr_gid = source->cr_gid; 456 target->cr_group_info = source->cr_group_info; 457 get_group_info(target->cr_group_info); 458 } 459 460 static inline int 461 same_name(const char *n1, const char *n2) { 462 return 0 == memcmp(n1, n2, HEXDIR_LEN); 463 } 464 465 static int 466 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) { 467 return(!memcmp(v1->data,v2->data,sizeof(v1->data))); 468 } 469 470 static int 471 cmp_clid(clientid_t * cl1, clientid_t * cl2) { 472 return((cl1->cl_boot == cl2->cl_boot) && 473 (cl1->cl_id == cl2->cl_id)); 474 } 475 476 /* XXX what about NGROUP */ 477 static int 478 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){ 479 return(cr1->cr_uid == cr2->cr_uid); 480 481 } 482 483 static void 484 gen_clid(struct nfs4_client *clp) { 485 clp->cl_clientid.cl_boot = boot_time; 486 clp->cl_clientid.cl_id = current_clientid++; 487 } 488 489 static void 490 gen_confirm(struct nfs4_client *clp) { 491 struct timespec tv; 492 u32 * p; 493 494 tv = CURRENT_TIME; 495 p = (u32 *)clp->cl_confirm.data; 496 *p++ = tv.tv_sec; 497 *p++ = tv.tv_nsec; 498 } 499 500 static int 501 check_name(struct xdr_netobj name) { 502 503 if (name.len == 0) 504 return 0; 505 if (name.len > NFS4_OPAQUE_LIMIT) { 506 printk("NFSD: check_name: name too long(%d)!\n", name.len); 507 return 0; 508 } 509 return 1; 510 } 511 512 static void 513 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 514 { 515 unsigned int idhashval; 516 517 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 518 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 519 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 520 list_add_tail(&clp->cl_lru, &client_lru); 521 clp->cl_time = get_seconds(); 522 } 523 524 static void 525 move_to_confirmed(struct nfs4_client *clp) 526 { 527 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 528 unsigned int strhashval; 529 530 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 531 list_del_init(&clp->cl_strhash); 532 list_del_init(&clp->cl_idhash); 533 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 534 strhashval = clientstr_hashval(clp->cl_recdir); 535 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 536 renew_client(clp); 537 } 538 539 static struct nfs4_client * 540 find_confirmed_client(clientid_t *clid) 541 { 542 struct nfs4_client *clp; 543 unsigned int idhashval = clientid_hashval(clid->cl_id); 544 545 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 546 if (cmp_clid(&clp->cl_clientid, clid)) 547 return clp; 548 } 549 return NULL; 550 } 551 552 static struct nfs4_client * 553 find_unconfirmed_client(clientid_t *clid) 554 { 555 struct nfs4_client *clp; 556 unsigned int idhashval = clientid_hashval(clid->cl_id); 557 558 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 559 if (cmp_clid(&clp->cl_clientid, clid)) 560 return clp; 561 } 562 return NULL; 563 } 564 565 static struct nfs4_client * 566 find_confirmed_client_by_str(const char *dname, unsigned int hashval) 567 { 568 struct nfs4_client *clp; 569 570 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { 571 if (same_name(clp->cl_recdir, dname)) 572 return clp; 573 } 574 return NULL; 575 } 576 577 static struct nfs4_client * 578 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval) 579 { 580 struct nfs4_client *clp; 581 582 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { 583 if (same_name(clp->cl_recdir, dname)) 584 return clp; 585 } 586 return NULL; 587 } 588 589 /* a helper function for parse_callback */ 590 static int 591 parse_octet(unsigned int *lenp, char **addrp) 592 { 593 unsigned int len = *lenp; 594 char *p = *addrp; 595 int n = -1; 596 char c; 597 598 for (;;) { 599 if (!len) 600 break; 601 len--; 602 c = *p++; 603 if (c == '.') 604 break; 605 if ((c < '0') || (c > '9')) { 606 n = -1; 607 break; 608 } 609 if (n < 0) 610 n = 0; 611 n = (n * 10) + (c - '0'); 612 if (n > 255) { 613 n = -1; 614 break; 615 } 616 } 617 *lenp = len; 618 *addrp = p; 619 return n; 620 } 621 622 /* parse and set the setclientid ipv4 callback address */ 623 static int 624 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp) 625 { 626 int temp = 0; 627 u32 cbaddr = 0; 628 u16 cbport = 0; 629 u32 addrlen = addr_len; 630 char *addr = addr_val; 631 int i, shift; 632 633 /* ipaddress */ 634 shift = 24; 635 for(i = 4; i > 0 ; i--) { 636 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 637 return 0; 638 } 639 cbaddr |= (temp << shift); 640 if (shift > 0) 641 shift -= 8; 642 } 643 *cbaddrp = cbaddr; 644 645 /* port */ 646 shift = 8; 647 for(i = 2; i > 0 ; i--) { 648 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 649 return 0; 650 } 651 cbport |= (temp << shift); 652 if (shift > 0) 653 shift -= 8; 654 } 655 *cbportp = cbport; 656 return 1; 657 } 658 659 static void 660 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se) 661 { 662 struct nfs4_callback *cb = &clp->cl_callback; 663 664 /* Currently, we only support tcp for the callback channel */ 665 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3)) 666 goto out_err; 667 668 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val, 669 &cb->cb_addr, &cb->cb_port))) 670 goto out_err; 671 cb->cb_prog = se->se_callback_prog; 672 cb->cb_ident = se->se_callback_ident; 673 return; 674 out_err: 675 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 676 "will not receive delegations\n", 677 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 678 679 return; 680 } 681 682 /* 683 * RFC 3010 has a complex implmentation description of processing a 684 * SETCLIENTID request consisting of 5 bullets, labeled as 685 * CASE0 - CASE4 below. 686 * 687 * NOTES: 688 * callback information will be processed in a future patch 689 * 690 * an unconfirmed record is added when: 691 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record. 692 * CASE 1: confirmed record found with matching name, principal, 693 * verifier, and clientid. 694 * CASE 2: confirmed record found with matching name, principal, 695 * and there is no unconfirmed record with matching 696 * name and principal 697 * 698 * an unconfirmed record is replaced when: 699 * CASE 3: confirmed record found with matching name, principal, 700 * and an unconfirmed record is found with matching 701 * name, principal, and with clientid and 702 * confirm that does not match the confirmed record. 703 * CASE 4: there is no confirmed record with matching name and 704 * principal. there is an unconfirmed record with 705 * matching name, principal. 706 * 707 * an unconfirmed record is deleted when: 708 * CASE 1: an unconfirmed record that matches input name, verifier, 709 * and confirmed clientid. 710 * CASE 4: any unconfirmed records with matching name and principal 711 * that exist after an unconfirmed record has been replaced 712 * as described above. 713 * 714 */ 715 int 716 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid) 717 { 718 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr; 719 struct xdr_netobj clname = { 720 .len = setclid->se_namelen, 721 .data = setclid->se_name, 722 }; 723 nfs4_verifier clverifier = setclid->se_verf; 724 unsigned int strhashval; 725 struct nfs4_client *conf, *unconf, *new; 726 int status; 727 char dname[HEXDIR_LEN]; 728 729 if (!check_name(clname)) 730 return nfserr_inval; 731 732 status = nfs4_make_rec_clidname(dname, &clname); 733 if (status) 734 return status; 735 736 /* 737 * XXX The Duplicate Request Cache (DRC) has been checked (??) 738 * We get here on a DRC miss. 739 */ 740 741 strhashval = clientstr_hashval(dname); 742 743 nfs4_lock_state(); 744 conf = find_confirmed_client_by_str(dname, strhashval); 745 if (conf) { 746 /* 747 * CASE 0: 748 * clname match, confirmed, different principal 749 * or different ip_address 750 */ 751 status = nfserr_clid_inuse; 752 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred) 753 || conf->cl_addr != ip_addr) { 754 printk("NFSD: setclientid: string in use by client" 755 "(clientid %08x/%08x)\n", 756 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id); 757 goto out; 758 } 759 } 760 unconf = find_unconfirmed_client_by_str(dname, strhashval); 761 status = nfserr_resource; 762 if (!conf) { 763 /* 764 * CASE 4: 765 * placed first, because it is the normal case. 766 */ 767 if (unconf) 768 expire_client(unconf); 769 new = create_client(clname, dname); 770 if (new == NULL) 771 goto out; 772 copy_verf(new, &clverifier); 773 new->cl_addr = ip_addr; 774 copy_cred(&new->cl_cred,&rqstp->rq_cred); 775 gen_clid(new); 776 gen_confirm(new); 777 gen_callback(new, setclid); 778 add_to_unconfirmed(new, strhashval); 779 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) { 780 /* 781 * CASE 1: 782 * cl_name match, confirmed, principal match 783 * verifier match: probable callback update 784 * 785 * remove any unconfirmed nfs4_client with 786 * matching cl_name, cl_verifier, and cl_clientid 787 * 788 * create and insert an unconfirmed nfs4_client with same 789 * cl_name, cl_verifier, and cl_clientid as existing 790 * nfs4_client, but with the new callback info and a 791 * new cl_confirm 792 */ 793 if (unconf) { 794 /* Note this is removing unconfirmed {*x***}, 795 * which is stronger than RFC recommended {vxc**}. 796 * This has the advantage that there is at most 797 * one {*x***} in either list at any time. 798 */ 799 expire_client(unconf); 800 } 801 new = create_client(clname, dname); 802 if (new == NULL) 803 goto out; 804 copy_verf(new,&conf->cl_verifier); 805 new->cl_addr = ip_addr; 806 copy_cred(&new->cl_cred,&rqstp->rq_cred); 807 copy_clid(new, conf); 808 gen_confirm(new); 809 gen_callback(new, setclid); 810 add_to_unconfirmed(new,strhashval); 811 } else if (!unconf) { 812 /* 813 * CASE 2: 814 * clname match, confirmed, principal match 815 * verfier does not match 816 * no unconfirmed. create a new unconfirmed nfs4_client 817 * using input clverifier, clname, and callback info 818 * and generate a new cl_clientid and cl_confirm. 819 */ 820 new = create_client(clname, dname); 821 if (new == NULL) 822 goto out; 823 copy_verf(new,&clverifier); 824 new->cl_addr = ip_addr; 825 copy_cred(&new->cl_cred,&rqstp->rq_cred); 826 gen_clid(new); 827 gen_confirm(new); 828 gen_callback(new, setclid); 829 add_to_unconfirmed(new, strhashval); 830 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) { 831 /* 832 * CASE3: 833 * confirmed found (name, principal match) 834 * confirmed verifier does not match input clverifier 835 * 836 * unconfirmed found (name match) 837 * confirmed->cl_confirm != unconfirmed->cl_confirm 838 * 839 * remove unconfirmed. 840 * 841 * create an unconfirmed nfs4_client 842 * with same cl_name as existing confirmed nfs4_client, 843 * but with new callback info, new cl_clientid, 844 * new cl_verifier and a new cl_confirm 845 */ 846 expire_client(unconf); 847 new = create_client(clname, dname); 848 if (new == NULL) 849 goto out; 850 copy_verf(new,&clverifier); 851 new->cl_addr = ip_addr; 852 copy_cred(&new->cl_cred,&rqstp->rq_cred); 853 gen_clid(new); 854 gen_confirm(new); 855 gen_callback(new, setclid); 856 add_to_unconfirmed(new, strhashval); 857 } else { 858 /* No cases hit !!! */ 859 status = nfserr_inval; 860 goto out; 861 862 } 863 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 864 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 865 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 866 status = nfs_ok; 867 out: 868 nfs4_unlock_state(); 869 return status; 870 } 871 872 873 /* 874 * RFC 3010 has a complex implmentation description of processing a 875 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing 876 * processing on a DRC miss, labeled as CASE1 - CASE4 below. 877 * 878 * NOTE: callback information will be processed here in a future patch 879 */ 880 int 881 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm) 882 { 883 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr; 884 struct nfs4_client *conf, *unconf; 885 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 886 clientid_t * clid = &setclientid_confirm->sc_clientid; 887 int status; 888 889 if (STALE_CLIENTID(clid)) 890 return nfserr_stale_clientid; 891 /* 892 * XXX The Duplicate Request Cache (DRC) has been checked (??) 893 * We get here on a DRC miss. 894 */ 895 896 nfs4_lock_state(); 897 898 conf = find_confirmed_client(clid); 899 unconf = find_unconfirmed_client(clid); 900 901 status = nfserr_clid_inuse; 902 if (conf && conf->cl_addr != ip_addr) 903 goto out; 904 if (unconf && unconf->cl_addr != ip_addr) 905 goto out; 906 907 if ((conf && unconf) && 908 (cmp_verf(&unconf->cl_confirm, &confirm)) && 909 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) && 910 (same_name(conf->cl_recdir,unconf->cl_recdir)) && 911 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) { 912 /* CASE 1: 913 * unconf record that matches input clientid and input confirm. 914 * conf record that matches input clientid. 915 * conf and unconf records match names, verifiers 916 */ 917 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 918 status = nfserr_clid_inuse; 919 else { 920 /* XXX: We just turn off callbacks until we can handle 921 * change request correctly. */ 922 atomic_set(&conf->cl_callback.cb_set, 0); 923 gen_confirm(conf); 924 nfsd4_remove_clid_dir(unconf); 925 expire_client(unconf); 926 status = nfs_ok; 927 928 } 929 } else if ((conf && !unconf) || 930 ((conf && unconf) && 931 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) || 932 !same_name(conf->cl_recdir, unconf->cl_recdir)))) { 933 /* CASE 2: 934 * conf record that matches input clientid. 935 * if unconf record matches input clientid, then 936 * unconf->cl_name or unconf->cl_verifier don't match the 937 * conf record. 938 */ 939 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) 940 status = nfserr_clid_inuse; 941 else 942 status = nfs_ok; 943 } else if (!conf && unconf 944 && cmp_verf(&unconf->cl_confirm, &confirm)) { 945 /* CASE 3: 946 * conf record not found. 947 * unconf record found. 948 * unconf->cl_confirm matches input confirm 949 */ 950 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 951 status = nfserr_clid_inuse; 952 } else { 953 unsigned int hash = 954 clientstr_hashval(unconf->cl_recdir); 955 conf = find_confirmed_client_by_str(unconf->cl_recdir, 956 hash); 957 if (conf) { 958 nfsd4_remove_clid_dir(conf); 959 expire_client(conf); 960 } 961 move_to_confirmed(unconf); 962 conf = unconf; 963 status = nfs_ok; 964 } 965 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) 966 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, 967 &confirm)))) { 968 /* CASE 4: 969 * conf record not found, or if conf, conf->cl_confirm does not 970 * match input confirm. 971 * unconf record not found, or if unconf, unconf->cl_confirm 972 * does not match input confirm. 973 */ 974 status = nfserr_stale_clientid; 975 } else { 976 /* check that we have hit one of the cases...*/ 977 status = nfserr_clid_inuse; 978 } 979 out: 980 if (!status) 981 nfsd4_probe_callback(conf); 982 nfs4_unlock_state(); 983 return status; 984 } 985 986 /* OPEN Share state helper functions */ 987 static inline struct nfs4_file * 988 alloc_init_file(struct inode *ino) 989 { 990 struct nfs4_file *fp; 991 unsigned int hashval = file_hashval(ino); 992 993 fp = kmem_cache_alloc(file_slab, GFP_KERNEL); 994 if (fp) { 995 kref_init(&fp->fi_ref); 996 INIT_LIST_HEAD(&fp->fi_hash); 997 INIT_LIST_HEAD(&fp->fi_stateids); 998 INIT_LIST_HEAD(&fp->fi_delegations); 999 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 1000 fp->fi_inode = igrab(ino); 1001 fp->fi_id = current_fileid++; 1002 return fp; 1003 } 1004 return NULL; 1005 } 1006 1007 static void 1008 nfsd4_free_slab(kmem_cache_t **slab) 1009 { 1010 int status; 1011 1012 if (*slab == NULL) 1013 return; 1014 status = kmem_cache_destroy(*slab); 1015 *slab = NULL; 1016 WARN_ON(status); 1017 } 1018 1019 static void 1020 nfsd4_free_slabs(void) 1021 { 1022 nfsd4_free_slab(&stateowner_slab); 1023 nfsd4_free_slab(&file_slab); 1024 nfsd4_free_slab(&stateid_slab); 1025 nfsd4_free_slab(&deleg_slab); 1026 } 1027 1028 static int 1029 nfsd4_init_slabs(void) 1030 { 1031 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 1032 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL); 1033 if (stateowner_slab == NULL) 1034 goto out_nomem; 1035 file_slab = kmem_cache_create("nfsd4_files", 1036 sizeof(struct nfs4_file), 0, 0, NULL, NULL); 1037 if (file_slab == NULL) 1038 goto out_nomem; 1039 stateid_slab = kmem_cache_create("nfsd4_stateids", 1040 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL); 1041 if (stateid_slab == NULL) 1042 goto out_nomem; 1043 deleg_slab = kmem_cache_create("nfsd4_delegations", 1044 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL); 1045 if (deleg_slab == NULL) 1046 goto out_nomem; 1047 return 0; 1048 out_nomem: 1049 nfsd4_free_slabs(); 1050 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 1051 return -ENOMEM; 1052 } 1053 1054 void 1055 nfs4_free_stateowner(struct kref *kref) 1056 { 1057 struct nfs4_stateowner *sop = 1058 container_of(kref, struct nfs4_stateowner, so_ref); 1059 kfree(sop->so_owner.data); 1060 kmem_cache_free(stateowner_slab, sop); 1061 } 1062 1063 static inline struct nfs4_stateowner * 1064 alloc_stateowner(struct xdr_netobj *owner) 1065 { 1066 struct nfs4_stateowner *sop; 1067 1068 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 1069 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 1070 memcpy(sop->so_owner.data, owner->data, owner->len); 1071 sop->so_owner.len = owner->len; 1072 kref_init(&sop->so_ref); 1073 return sop; 1074 } 1075 kmem_cache_free(stateowner_slab, sop); 1076 } 1077 return NULL; 1078 } 1079 1080 static struct nfs4_stateowner * 1081 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 1082 struct nfs4_stateowner *sop; 1083 struct nfs4_replay *rp; 1084 unsigned int idhashval; 1085 1086 if (!(sop = alloc_stateowner(&open->op_owner))) 1087 return NULL; 1088 idhashval = ownerid_hashval(current_ownerid); 1089 INIT_LIST_HEAD(&sop->so_idhash); 1090 INIT_LIST_HEAD(&sop->so_strhash); 1091 INIT_LIST_HEAD(&sop->so_perclient); 1092 INIT_LIST_HEAD(&sop->so_stateids); 1093 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ 1094 INIT_LIST_HEAD(&sop->so_close_lru); 1095 sop->so_time = 0; 1096 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 1097 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 1098 list_add(&sop->so_perclient, &clp->cl_openowners); 1099 sop->so_is_open_owner = 1; 1100 sop->so_id = current_ownerid++; 1101 sop->so_client = clp; 1102 sop->so_seqid = open->op_seqid; 1103 sop->so_confirmed = 0; 1104 rp = &sop->so_replay; 1105 rp->rp_status = nfserr_serverfault; 1106 rp->rp_buflen = 0; 1107 rp->rp_buf = rp->rp_ibuf; 1108 return sop; 1109 } 1110 1111 static void 1112 release_stateid_lockowners(struct nfs4_stateid *open_stp) 1113 { 1114 struct nfs4_stateowner *lock_sop; 1115 1116 while (!list_empty(&open_stp->st_lockowners)) { 1117 lock_sop = list_entry(open_stp->st_lockowners.next, 1118 struct nfs4_stateowner, so_perstateid); 1119 /* list_del(&open_stp->st_lockowners); */ 1120 BUG_ON(lock_sop->so_is_open_owner); 1121 release_stateowner(lock_sop); 1122 } 1123 } 1124 1125 static void 1126 unhash_stateowner(struct nfs4_stateowner *sop) 1127 { 1128 struct nfs4_stateid *stp; 1129 1130 list_del(&sop->so_idhash); 1131 list_del(&sop->so_strhash); 1132 if (sop->so_is_open_owner) 1133 list_del(&sop->so_perclient); 1134 list_del(&sop->so_perstateid); 1135 while (!list_empty(&sop->so_stateids)) { 1136 stp = list_entry(sop->so_stateids.next, 1137 struct nfs4_stateid, st_perstateowner); 1138 if (sop->so_is_open_owner) 1139 release_stateid(stp, OPEN_STATE); 1140 else 1141 release_stateid(stp, LOCK_STATE); 1142 } 1143 } 1144 1145 static void 1146 release_stateowner(struct nfs4_stateowner *sop) 1147 { 1148 unhash_stateowner(sop); 1149 list_del(&sop->so_close_lru); 1150 nfs4_put_stateowner(sop); 1151 } 1152 1153 static inline void 1154 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 1155 struct nfs4_stateowner *sop = open->op_stateowner; 1156 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 1157 1158 INIT_LIST_HEAD(&stp->st_hash); 1159 INIT_LIST_HEAD(&stp->st_perstateowner); 1160 INIT_LIST_HEAD(&stp->st_lockowners); 1161 INIT_LIST_HEAD(&stp->st_perfile); 1162 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 1163 list_add(&stp->st_perstateowner, &sop->so_stateids); 1164 list_add(&stp->st_perfile, &fp->fi_stateids); 1165 stp->st_stateowner = sop; 1166 get_nfs4_file(fp); 1167 stp->st_file = fp; 1168 stp->st_stateid.si_boot = boot_time; 1169 stp->st_stateid.si_stateownerid = sop->so_id; 1170 stp->st_stateid.si_fileid = fp->fi_id; 1171 stp->st_stateid.si_generation = 0; 1172 stp->st_access_bmap = 0; 1173 stp->st_deny_bmap = 0; 1174 __set_bit(open->op_share_access, &stp->st_access_bmap); 1175 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1176 stp->st_openstp = NULL; 1177 } 1178 1179 static void 1180 release_stateid(struct nfs4_stateid *stp, int flags) 1181 { 1182 struct file *filp = stp->st_vfs_file; 1183 1184 list_del(&stp->st_hash); 1185 list_del(&stp->st_perfile); 1186 list_del(&stp->st_perstateowner); 1187 if (flags & OPEN_STATE) { 1188 release_stateid_lockowners(stp); 1189 stp->st_vfs_file = NULL; 1190 nfsd_close(filp); 1191 } else if (flags & LOCK_STATE) 1192 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner); 1193 put_nfs4_file(stp->st_file); 1194 kmem_cache_free(stateid_slab, stp); 1195 } 1196 1197 static void 1198 move_to_close_lru(struct nfs4_stateowner *sop) 1199 { 1200 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 1201 1202 list_move_tail(&sop->so_close_lru, &close_lru); 1203 sop->so_time = get_seconds(); 1204 } 1205 1206 static int 1207 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) { 1208 return ((sop->so_owner.len == owner->len) && 1209 !memcmp(sop->so_owner.data, owner->data, owner->len) && 1210 (sop->so_client->cl_clientid.cl_id == clid->cl_id)); 1211 } 1212 1213 static struct nfs4_stateowner * 1214 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) 1215 { 1216 struct nfs4_stateowner *so = NULL; 1217 1218 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { 1219 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid)) 1220 return so; 1221 } 1222 return NULL; 1223 } 1224 1225 /* search file_hashtbl[] for file */ 1226 static struct nfs4_file * 1227 find_file(struct inode *ino) 1228 { 1229 unsigned int hashval = file_hashval(ino); 1230 struct nfs4_file *fp; 1231 1232 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { 1233 if (fp->fi_inode == ino) { 1234 get_nfs4_file(fp); 1235 return fp; 1236 } 1237 } 1238 return NULL; 1239 } 1240 1241 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0) 1242 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0) 1243 1244 static void 1245 set_access(unsigned int *access, unsigned long bmap) { 1246 int i; 1247 1248 *access = 0; 1249 for (i = 1; i < 4; i++) { 1250 if (test_bit(i, &bmap)) 1251 *access |= i; 1252 } 1253 } 1254 1255 static void 1256 set_deny(unsigned int *deny, unsigned long bmap) { 1257 int i; 1258 1259 *deny = 0; 1260 for (i = 0; i < 4; i++) { 1261 if (test_bit(i, &bmap)) 1262 *deny |= i ; 1263 } 1264 } 1265 1266 static int 1267 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 1268 unsigned int access, deny; 1269 1270 set_access(&access, stp->st_access_bmap); 1271 set_deny(&deny, stp->st_deny_bmap); 1272 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 1273 return 0; 1274 return 1; 1275 } 1276 1277 /* 1278 * Called to check deny when READ with all zero stateid or 1279 * WRITE with all zero or all one stateid 1280 */ 1281 static int 1282 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 1283 { 1284 struct inode *ino = current_fh->fh_dentry->d_inode; 1285 struct nfs4_file *fp; 1286 struct nfs4_stateid *stp; 1287 int ret; 1288 1289 dprintk("NFSD: nfs4_share_conflict\n"); 1290 1291 fp = find_file(ino); 1292 if (!fp) 1293 return nfs_ok; 1294 ret = nfserr_locked; 1295 /* Search for conflicting share reservations */ 1296 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { 1297 if (test_bit(deny_type, &stp->st_deny_bmap) || 1298 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 1299 goto out; 1300 } 1301 ret = nfs_ok; 1302 out: 1303 put_nfs4_file(fp); 1304 return ret; 1305 } 1306 1307 static inline void 1308 nfs4_file_downgrade(struct file *filp, unsigned int share_access) 1309 { 1310 if (share_access & NFS4_SHARE_ACCESS_WRITE) { 1311 put_write_access(filp->f_dentry->d_inode); 1312 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; 1313 } 1314 } 1315 1316 /* 1317 * Recall a delegation 1318 */ 1319 static int 1320 do_recall(void *__dp) 1321 { 1322 struct nfs4_delegation *dp = __dp; 1323 1324 daemonize("nfsv4-recall"); 1325 1326 nfsd4_cb_recall(dp); 1327 return 0; 1328 } 1329 1330 /* 1331 * Spawn a thread to perform a recall on the delegation represented 1332 * by the lease (file_lock) 1333 * 1334 * Called from break_lease() with lock_kernel() held. 1335 * Note: we assume break_lease will only call this *once* for any given 1336 * lease. 1337 */ 1338 static 1339 void nfsd_break_deleg_cb(struct file_lock *fl) 1340 { 1341 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner; 1342 struct task_struct *t; 1343 1344 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 1345 if (!dp) 1346 return; 1347 1348 /* We're assuming the state code never drops its reference 1349 * without first removing the lease. Since we're in this lease 1350 * callback (and since the lease code is serialized by the kernel 1351 * lock) we know the server hasn't removed the lease yet, we know 1352 * it's safe to take a reference: */ 1353 atomic_inc(&dp->dl_count); 1354 1355 spin_lock(&recall_lock); 1356 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 1357 spin_unlock(&recall_lock); 1358 1359 /* only place dl_time is set. protected by lock_kernel*/ 1360 dp->dl_time = get_seconds(); 1361 1362 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */ 1363 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ; 1364 1365 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall"); 1366 if (IS_ERR(t)) { 1367 struct nfs4_client *clp = dp->dl_client; 1368 1369 printk(KERN_INFO "NFSD: Callback thread failed for " 1370 "for client (clientid %08x/%08x)\n", 1371 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 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 int 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 int 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 int 1524 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, 1525 struct nfs4_delegation **dp) 1526 { 1527 int flags; 1528 int 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 int 1548 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 1549 { 1550 struct nfs4_stateid *local; 1551 int 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 int 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 int 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 int 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 int 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_dentry->d_inode; 1625 unsigned int share_access, new_writer; 1626 int 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 status = get_write_access(inode); 1634 if (status) 1635 return nfserrno(status); 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 /* 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 = 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 printk("NFSD: WARNING: refusing delegation reclaim\n"); 1733 open->op_delegate_type = flag; 1734 } 1735 1736 /* 1737 * called with nfs4_lock_state() held. 1738 */ 1739 int 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 int status; 1747 1748 status = nfserr_inval; 1749 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny)) 1750 goto out; 1751 /* 1752 * Lookup file; if found, lookup stateid and check open request, 1753 * and check for delegations in the process of being recalled. 1754 * If not found, create the nfs4_file struct 1755 */ 1756 fp = find_file(ino); 1757 if (fp) { 1758 if ((status = nfs4_check_open(fp, open, &stp))) 1759 goto out; 1760 status = nfs4_check_deleg(fp, open, &dp); 1761 if (status) 1762 goto out; 1763 } else { 1764 status = nfserr_bad_stateid; 1765 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) 1766 goto out; 1767 status = nfserr_resource; 1768 fp = alloc_init_file(ino); 1769 if (fp == NULL) 1770 goto out; 1771 } 1772 1773 /* 1774 * OPEN the file, or upgrade an existing OPEN. 1775 * If truncate fails, the OPEN fails. 1776 */ 1777 if (stp) { 1778 /* Stateid was found, this is an OPEN upgrade */ 1779 status = nfs4_upgrade_open(rqstp, current_fh, stp, open); 1780 if (status) 1781 goto out; 1782 update_stateid(&stp->st_stateid); 1783 } else { 1784 /* Stateid was not found, this is a new OPEN */ 1785 int flags = 0; 1786 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1787 flags = MAY_WRITE; 1788 else 1789 flags = MAY_READ; 1790 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags); 1791 if (status) 1792 goto out; 1793 init_stateid(stp, fp, open); 1794 status = nfsd4_truncate(rqstp, current_fh, open); 1795 if (status) { 1796 release_stateid(stp, OPEN_STATE); 1797 goto out; 1798 } 1799 } 1800 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 1801 1802 /* 1803 * Attempt to hand out a delegation. No error return, because the 1804 * OPEN succeeds even if we fail. 1805 */ 1806 nfs4_open_delegation(current_fh, open, stp); 1807 1808 status = nfs_ok; 1809 1810 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n", 1811 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid, 1812 stp->st_stateid.si_fileid, stp->st_stateid.si_generation); 1813 out: 1814 if (fp) 1815 put_nfs4_file(fp); 1816 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 1817 nfs4_set_claim_prev(open); 1818 /* 1819 * To finish the open response, we just need to set the rflags. 1820 */ 1821 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 1822 if (!open->op_stateowner->so_confirmed) 1823 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 1824 1825 return status; 1826 } 1827 1828 static struct workqueue_struct *laundry_wq; 1829 static struct work_struct laundromat_work; 1830 static void laundromat_main(void *); 1831 static DECLARE_WORK(laundromat_work, laundromat_main, NULL); 1832 1833 int 1834 nfsd4_renew(clientid_t *clid) 1835 { 1836 struct nfs4_client *clp; 1837 int status; 1838 1839 nfs4_lock_state(); 1840 dprintk("process_renew(%08x/%08x): starting\n", 1841 clid->cl_boot, clid->cl_id); 1842 status = nfserr_stale_clientid; 1843 if (STALE_CLIENTID(clid)) 1844 goto out; 1845 clp = find_confirmed_client(clid); 1846 status = nfserr_expired; 1847 if (clp == NULL) { 1848 /* We assume the client took too long to RENEW. */ 1849 dprintk("nfsd4_renew: clientid not found!\n"); 1850 goto out; 1851 } 1852 renew_client(clp); 1853 status = nfserr_cb_path_down; 1854 if (!list_empty(&clp->cl_delegations) 1855 && !atomic_read(&clp->cl_callback.cb_set)) 1856 goto out; 1857 status = nfs_ok; 1858 out: 1859 nfs4_unlock_state(); 1860 return status; 1861 } 1862 1863 static void 1864 end_grace(void) 1865 { 1866 dprintk("NFSD: end of grace period\n"); 1867 nfsd4_recdir_purge_old(); 1868 in_grace = 0; 1869 } 1870 1871 static time_t 1872 nfs4_laundromat(void) 1873 { 1874 struct nfs4_client *clp; 1875 struct nfs4_stateowner *sop; 1876 struct nfs4_delegation *dp; 1877 struct list_head *pos, *next, reaplist; 1878 time_t cutoff = get_seconds() - NFSD_LEASE_TIME; 1879 time_t t, clientid_val = NFSD_LEASE_TIME; 1880 time_t u, test_val = NFSD_LEASE_TIME; 1881 1882 nfs4_lock_state(); 1883 1884 dprintk("NFSD: laundromat service - starting\n"); 1885 if (in_grace) 1886 end_grace(); 1887 list_for_each_safe(pos, next, &client_lru) { 1888 clp = list_entry(pos, struct nfs4_client, cl_lru); 1889 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 1890 t = clp->cl_time - cutoff; 1891 if (clientid_val > t) 1892 clientid_val = t; 1893 break; 1894 } 1895 dprintk("NFSD: purging unused client (clientid %08x)\n", 1896 clp->cl_clientid.cl_id); 1897 nfsd4_remove_clid_dir(clp); 1898 expire_client(clp); 1899 } 1900 INIT_LIST_HEAD(&reaplist); 1901 spin_lock(&recall_lock); 1902 list_for_each_safe(pos, next, &del_recall_lru) { 1903 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1904 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 1905 u = dp->dl_time - cutoff; 1906 if (test_val > u) 1907 test_val = u; 1908 break; 1909 } 1910 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 1911 dp, dp->dl_flock); 1912 list_move(&dp->dl_recall_lru, &reaplist); 1913 } 1914 spin_unlock(&recall_lock); 1915 list_for_each_safe(pos, next, &reaplist) { 1916 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1917 list_del_init(&dp->dl_recall_lru); 1918 unhash_delegation(dp); 1919 } 1920 test_val = NFSD_LEASE_TIME; 1921 list_for_each_safe(pos, next, &close_lru) { 1922 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 1923 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 1924 u = sop->so_time - cutoff; 1925 if (test_val > u) 1926 test_val = u; 1927 break; 1928 } 1929 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 1930 sop->so_id); 1931 release_stateowner(sop); 1932 } 1933 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 1934 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 1935 nfs4_unlock_state(); 1936 return clientid_val; 1937 } 1938 1939 void 1940 laundromat_main(void *not_used) 1941 { 1942 time_t t; 1943 1944 t = nfs4_laundromat(); 1945 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 1946 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); 1947 } 1948 1949 static struct nfs4_stateowner * 1950 search_close_lru(u32 st_id, int flags) 1951 { 1952 struct nfs4_stateowner *local = NULL; 1953 1954 if (flags & CLOSE_STATE) { 1955 list_for_each_entry(local, &close_lru, so_close_lru) { 1956 if (local->so_id == st_id) 1957 return local; 1958 } 1959 } 1960 return NULL; 1961 } 1962 1963 static inline int 1964 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 1965 { 1966 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode; 1967 } 1968 1969 static int 1970 STALE_STATEID(stateid_t *stateid) 1971 { 1972 if (stateid->si_boot == boot_time) 1973 return 0; 1974 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n", 1975 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 1976 stateid->si_generation); 1977 return 1; 1978 } 1979 1980 static inline int 1981 access_permit_read(unsigned long access_bmap) 1982 { 1983 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 1984 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 1985 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 1986 } 1987 1988 static inline int 1989 access_permit_write(unsigned long access_bmap) 1990 { 1991 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 1992 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 1993 } 1994 1995 static 1996 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 1997 { 1998 int status = nfserr_openmode; 1999 2000 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 2001 goto out; 2002 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 2003 goto out; 2004 status = nfs_ok; 2005 out: 2006 return status; 2007 } 2008 2009 static inline int 2010 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 2011 { 2012 /* Trying to call delegreturn with a special stateid? Yuch: */ 2013 if (!(flags & (RD_STATE | WR_STATE))) 2014 return nfserr_bad_stateid; 2015 else if (ONE_STATEID(stateid) && (flags & RD_STATE)) 2016 return nfs_ok; 2017 else if (nfs4_in_grace()) { 2018 /* Answer in remaining cases depends on existance of 2019 * conflicting state; so we must wait out the grace period. */ 2020 return nfserr_grace; 2021 } else if (flags & WR_STATE) 2022 return nfs4_share_conflict(current_fh, 2023 NFS4_SHARE_DENY_WRITE); 2024 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 2025 return nfs4_share_conflict(current_fh, 2026 NFS4_SHARE_DENY_READ); 2027 } 2028 2029 /* 2030 * Allow READ/WRITE during grace period on recovered state only for files 2031 * that are not able to provide mandatory locking. 2032 */ 2033 static inline int 2034 io_during_grace_disallowed(struct inode *inode, int flags) 2035 { 2036 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE)) 2037 && MANDATORY_LOCK(inode); 2038 } 2039 2040 /* 2041 * Checks for stateid operations 2042 */ 2043 int 2044 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp) 2045 { 2046 struct nfs4_stateid *stp = NULL; 2047 struct nfs4_delegation *dp = NULL; 2048 stateid_t *stidp; 2049 struct inode *ino = current_fh->fh_dentry->d_inode; 2050 int status; 2051 2052 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n", 2053 stateid->si_boot, stateid->si_stateownerid, 2054 stateid->si_fileid, stateid->si_generation); 2055 if (filpp) 2056 *filpp = NULL; 2057 2058 if (io_during_grace_disallowed(ino, flags)) 2059 return nfserr_grace; 2060 2061 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2062 return check_special_stateids(current_fh, stateid, flags); 2063 2064 /* STALE STATEID */ 2065 status = nfserr_stale_stateid; 2066 if (STALE_STATEID(stateid)) 2067 goto out; 2068 2069 /* BAD STATEID */ 2070 status = nfserr_bad_stateid; 2071 if (!stateid->si_fileid) { /* delegation stateid */ 2072 if(!(dp = find_delegation_stateid(ino, stateid))) { 2073 dprintk("NFSD: delegation stateid not found\n"); 2074 if (nfs4_in_grace()) 2075 status = nfserr_grace; 2076 goto out; 2077 } 2078 stidp = &dp->dl_stateid; 2079 } else { /* open or lock stateid */ 2080 if (!(stp = find_stateid(stateid, flags))) { 2081 dprintk("NFSD: open or lock stateid not found\n"); 2082 if (nfs4_in_grace()) 2083 status = nfserr_grace; 2084 goto out; 2085 } 2086 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) 2087 goto out; 2088 if (!stp->st_stateowner->so_confirmed) 2089 goto out; 2090 stidp = &stp->st_stateid; 2091 } 2092 if (stateid->si_generation > stidp->si_generation) 2093 goto out; 2094 2095 /* OLD STATEID */ 2096 status = nfserr_old_stateid; 2097 if (stateid->si_generation < stidp->si_generation) 2098 goto out; 2099 if (stp) { 2100 if ((status = nfs4_check_openmode(stp,flags))) 2101 goto out; 2102 renew_client(stp->st_stateowner->so_client); 2103 if (filpp) 2104 *filpp = stp->st_vfs_file; 2105 } else if (dp) { 2106 if ((status = nfs4_check_delegmode(dp, flags))) 2107 goto out; 2108 renew_client(dp->dl_client); 2109 if (flags & DELEG_RET) 2110 unhash_delegation(dp); 2111 if (filpp) 2112 *filpp = dp->dl_vfs_file; 2113 } 2114 status = nfs_ok; 2115 out: 2116 return status; 2117 } 2118 2119 static inline int 2120 setlkflg (int type) 2121 { 2122 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 2123 RD_STATE : WR_STATE; 2124 } 2125 2126 /* 2127 * Checks for sequence id mutating operations. 2128 */ 2129 static int 2130 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) 2131 { 2132 struct nfs4_stateid *stp; 2133 struct nfs4_stateowner *sop; 2134 2135 dprintk("NFSD: preprocess_seqid_op: seqid=%d " 2136 "stateid = (%08x/%08x/%08x/%08x)\n", seqid, 2137 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 2138 stateid->si_generation); 2139 2140 *stpp = NULL; 2141 *sopp = NULL; 2142 2143 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 2144 printk("NFSD: preprocess_seqid_op: magic stateid!\n"); 2145 return nfserr_bad_stateid; 2146 } 2147 2148 if (STALE_STATEID(stateid)) 2149 return nfserr_stale_stateid; 2150 /* 2151 * We return BAD_STATEID if filehandle doesn't match stateid, 2152 * the confirmed flag is incorrecly set, or the generation 2153 * number is incorrect. 2154 */ 2155 stp = find_stateid(stateid, flags); 2156 if (stp == NULL) { 2157 /* 2158 * Also, we should make sure this isn't just the result of 2159 * a replayed close: 2160 */ 2161 sop = search_close_lru(stateid->si_stateownerid, flags); 2162 if (sop == NULL) 2163 return nfserr_bad_stateid; 2164 *sopp = sop; 2165 goto check_replay; 2166 } 2167 2168 if (lock) { 2169 struct nfs4_stateowner *sop = stp->st_stateowner; 2170 clientid_t *lockclid = &lock->v.new.clientid; 2171 struct nfs4_client *clp = sop->so_client; 2172 int lkflg = 0; 2173 int status; 2174 2175 lkflg = setlkflg(lock->lk_type); 2176 2177 if (lock->lk_is_new) { 2178 if (!sop->so_is_open_owner) 2179 return nfserr_bad_stateid; 2180 if (!cmp_clid(&clp->cl_clientid, lockclid)) 2181 return nfserr_bad_stateid; 2182 /* stp is the open stateid */ 2183 status = nfs4_check_openmode(stp, lkflg); 2184 if (status) 2185 return status; 2186 } else { 2187 /* stp is the lock stateid */ 2188 status = nfs4_check_openmode(stp->st_openstp, lkflg); 2189 if (status) 2190 return status; 2191 } 2192 2193 } 2194 2195 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) { 2196 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 2197 return nfserr_bad_stateid; 2198 } 2199 2200 *stpp = stp; 2201 *sopp = sop = stp->st_stateowner; 2202 2203 /* 2204 * We now validate the seqid and stateid generation numbers. 2205 * For the moment, we ignore the possibility of 2206 * generation number wraparound. 2207 */ 2208 if (seqid != sop->so_seqid) 2209 goto check_replay; 2210 2211 if (sop->so_confirmed && flags & CONFIRM) { 2212 printk("NFSD: preprocess_seqid_op: expected" 2213 " unconfirmed stateowner!\n"); 2214 return nfserr_bad_stateid; 2215 } 2216 if (!sop->so_confirmed && !(flags & CONFIRM)) { 2217 printk("NFSD: preprocess_seqid_op: stateowner not" 2218 " confirmed yet!\n"); 2219 return nfserr_bad_stateid; 2220 } 2221 if (stateid->si_generation > stp->st_stateid.si_generation) { 2222 printk("NFSD: preprocess_seqid_op: future stateid?!\n"); 2223 return nfserr_bad_stateid; 2224 } 2225 2226 if (stateid->si_generation < stp->st_stateid.si_generation) { 2227 printk("NFSD: preprocess_seqid_op: old stateid!\n"); 2228 return nfserr_old_stateid; 2229 } 2230 renew_client(sop->so_client); 2231 return nfs_ok; 2232 2233 check_replay: 2234 if (seqid == sop->so_seqid - 1) { 2235 dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); 2236 /* indicate replay to calling function */ 2237 return NFSERR_REPLAY_ME; 2238 } 2239 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", 2240 sop->so_seqid, seqid); 2241 *sopp = NULL; 2242 return nfserr_bad_seqid; 2243 } 2244 2245 int 2246 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner) 2247 { 2248 int status; 2249 struct nfs4_stateowner *sop; 2250 struct nfs4_stateid *stp; 2251 2252 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 2253 (int)current_fh->fh_dentry->d_name.len, 2254 current_fh->fh_dentry->d_name.name); 2255 2256 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) 2257 goto out; 2258 2259 nfs4_lock_state(); 2260 2261 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid, 2262 &oc->oc_req_stateid, 2263 CHECK_FH | CONFIRM | OPEN_STATE, 2264 &oc->oc_stateowner, &stp, NULL))) 2265 goto out; 2266 2267 sop = oc->oc_stateowner; 2268 sop->so_confirmed = 1; 2269 update_stateid(&stp->st_stateid); 2270 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 2271 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 2272 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid, 2273 stp->st_stateid.si_boot, 2274 stp->st_stateid.si_stateownerid, 2275 stp->st_stateid.si_fileid, 2276 stp->st_stateid.si_generation); 2277 2278 nfsd4_create_clid_dir(sop->so_client); 2279 out: 2280 if (oc->oc_stateowner) { 2281 nfs4_get_stateowner(oc->oc_stateowner); 2282 *replay_owner = oc->oc_stateowner; 2283 } 2284 nfs4_unlock_state(); 2285 return status; 2286 } 2287 2288 2289 /* 2290 * unset all bits in union bitmap (bmap) that 2291 * do not exist in share (from successful OPEN_DOWNGRADE) 2292 */ 2293 static void 2294 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 2295 { 2296 int i; 2297 for (i = 1; i < 4; i++) { 2298 if ((i & access) != i) 2299 __clear_bit(i, bmap); 2300 } 2301 } 2302 2303 static void 2304 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 2305 { 2306 int i; 2307 for (i = 0; i < 4; i++) { 2308 if ((i & deny) != i) 2309 __clear_bit(i, bmap); 2310 } 2311 } 2312 2313 int 2314 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner) 2315 { 2316 int status; 2317 struct nfs4_stateid *stp; 2318 unsigned int share_access; 2319 2320 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 2321 (int)current_fh->fh_dentry->d_name.len, 2322 current_fh->fh_dentry->d_name.name); 2323 2324 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny)) 2325 return nfserr_inval; 2326 2327 nfs4_lock_state(); 2328 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 2329 &od->od_stateid, 2330 CHECK_FH | OPEN_STATE, 2331 &od->od_stateowner, &stp, NULL))) 2332 goto out; 2333 2334 status = nfserr_inval; 2335 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 2336 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 2337 stp->st_access_bmap, od->od_share_access); 2338 goto out; 2339 } 2340 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 2341 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 2342 stp->st_deny_bmap, od->od_share_deny); 2343 goto out; 2344 } 2345 set_access(&share_access, stp->st_access_bmap); 2346 nfs4_file_downgrade(stp->st_vfs_file, 2347 share_access & ~od->od_share_access); 2348 2349 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 2350 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 2351 2352 update_stateid(&stp->st_stateid); 2353 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 2354 status = nfs_ok; 2355 out: 2356 if (od->od_stateowner) { 2357 nfs4_get_stateowner(od->od_stateowner); 2358 *replay_owner = od->od_stateowner; 2359 } 2360 nfs4_unlock_state(); 2361 return status; 2362 } 2363 2364 /* 2365 * nfs4_unlock_state() called after encode 2366 */ 2367 int 2368 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner) 2369 { 2370 int status; 2371 struct nfs4_stateid *stp; 2372 2373 dprintk("NFSD: nfsd4_close on file %.*s\n", 2374 (int)current_fh->fh_dentry->d_name.len, 2375 current_fh->fh_dentry->d_name.name); 2376 2377 nfs4_lock_state(); 2378 /* check close_lru for replay */ 2379 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 2380 &close->cl_stateid, 2381 CHECK_FH | OPEN_STATE | CLOSE_STATE, 2382 &close->cl_stateowner, &stp, NULL))) 2383 goto out; 2384 status = nfs_ok; 2385 update_stateid(&stp->st_stateid); 2386 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 2387 2388 /* release_stateid() calls nfsd_close() if needed */ 2389 release_stateid(stp, OPEN_STATE); 2390 2391 /* place unused nfs4_stateowners on so_close_lru list to be 2392 * released by the laundromat service after the lease period 2393 * to enable us to handle CLOSE replay 2394 */ 2395 if (list_empty(&close->cl_stateowner->so_stateids)) 2396 move_to_close_lru(close->cl_stateowner); 2397 out: 2398 if (close->cl_stateowner) { 2399 nfs4_get_stateowner(close->cl_stateowner); 2400 *replay_owner = close->cl_stateowner; 2401 } 2402 nfs4_unlock_state(); 2403 return status; 2404 } 2405 2406 int 2407 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr) 2408 { 2409 int status; 2410 2411 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) 2412 goto out; 2413 2414 nfs4_lock_state(); 2415 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL); 2416 nfs4_unlock_state(); 2417 out: 2418 return status; 2419 } 2420 2421 2422 /* 2423 * Lock owner state (byte-range locks) 2424 */ 2425 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 2426 #define LOCK_HASH_BITS 8 2427 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 2428 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 2429 2430 #define lockownerid_hashval(id) \ 2431 ((id) & LOCK_HASH_MASK) 2432 2433 static inline unsigned int 2434 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 2435 struct xdr_netobj *ownername) 2436 { 2437 return (file_hashval(inode) + cl_id 2438 + opaque_hashval(ownername->data, ownername->len)) 2439 & LOCK_HASH_MASK; 2440 } 2441 2442 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 2443 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 2444 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 2445 2446 static struct nfs4_stateid * 2447 find_stateid(stateid_t *stid, int flags) 2448 { 2449 struct nfs4_stateid *local = NULL; 2450 u32 st_id = stid->si_stateownerid; 2451 u32 f_id = stid->si_fileid; 2452 unsigned int hashval; 2453 2454 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 2455 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) { 2456 hashval = stateid_hashval(st_id, f_id); 2457 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 2458 if ((local->st_stateid.si_stateownerid == st_id) && 2459 (local->st_stateid.si_fileid == f_id)) 2460 return local; 2461 } 2462 } 2463 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) { 2464 hashval = stateid_hashval(st_id, f_id); 2465 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 2466 if ((local->st_stateid.si_stateownerid == st_id) && 2467 (local->st_stateid.si_fileid == f_id)) 2468 return local; 2469 } 2470 } 2471 return NULL; 2472 } 2473 2474 static struct nfs4_delegation * 2475 find_delegation_stateid(struct inode *ino, stateid_t *stid) 2476 { 2477 struct nfs4_file *fp; 2478 struct nfs4_delegation *dl; 2479 2480 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n", 2481 stid->si_boot, stid->si_stateownerid, 2482 stid->si_fileid, stid->si_generation); 2483 2484 fp = find_file(ino); 2485 if (!fp) 2486 return NULL; 2487 dl = find_delegation_file(fp, stid); 2488 put_nfs4_file(fp); 2489 return dl; 2490 } 2491 2492 /* 2493 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 2494 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 2495 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 2496 * locking, this prevents us from being completely protocol-compliant. The 2497 * real solution to this problem is to start using unsigned file offsets in 2498 * the VFS, but this is a very deep change! 2499 */ 2500 static inline void 2501 nfs4_transform_lock_offset(struct file_lock *lock) 2502 { 2503 if (lock->fl_start < 0) 2504 lock->fl_start = OFFSET_MAX; 2505 if (lock->fl_end < 0) 2506 lock->fl_end = OFFSET_MAX; 2507 } 2508 2509 /* Hack!: For now, we're defining this just so we can use a pointer to it 2510 * as a unique cookie to identify our (NFSv4's) posix locks. */ 2511 static struct lock_manager_operations nfsd_posix_mng_ops = { 2512 }; 2513 2514 static inline void 2515 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 2516 { 2517 struct nfs4_stateowner *sop; 2518 unsigned int hval; 2519 2520 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 2521 sop = (struct nfs4_stateowner *) fl->fl_owner; 2522 hval = lockownerid_hashval(sop->so_id); 2523 kref_get(&sop->so_ref); 2524 deny->ld_sop = sop; 2525 deny->ld_clientid = sop->so_client->cl_clientid; 2526 } else { 2527 deny->ld_sop = NULL; 2528 deny->ld_clientid.cl_boot = 0; 2529 deny->ld_clientid.cl_id = 0; 2530 } 2531 deny->ld_start = fl->fl_start; 2532 deny->ld_length = ~(u64)0; 2533 if (fl->fl_end != ~(u64)0) 2534 deny->ld_length = fl->fl_end - fl->fl_start + 1; 2535 deny->ld_type = NFS4_READ_LT; 2536 if (fl->fl_type != F_RDLCK) 2537 deny->ld_type = NFS4_WRITE_LT; 2538 } 2539 2540 static struct nfs4_stateowner * 2541 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 2542 struct xdr_netobj *owner) 2543 { 2544 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 2545 struct nfs4_stateowner *op; 2546 2547 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 2548 if (cmp_owner_str(op, owner, clid)) 2549 return op; 2550 } 2551 return NULL; 2552 } 2553 2554 /* 2555 * Alloc a lock owner structure. 2556 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 2557 * occured. 2558 * 2559 * strhashval = lock_ownerstr_hashval 2560 */ 2561 2562 static struct nfs4_stateowner * 2563 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 2564 struct nfs4_stateowner *sop; 2565 struct nfs4_replay *rp; 2566 unsigned int idhashval; 2567 2568 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 2569 return NULL; 2570 idhashval = lockownerid_hashval(current_ownerid); 2571 INIT_LIST_HEAD(&sop->so_idhash); 2572 INIT_LIST_HEAD(&sop->so_strhash); 2573 INIT_LIST_HEAD(&sop->so_perclient); 2574 INIT_LIST_HEAD(&sop->so_stateids); 2575 INIT_LIST_HEAD(&sop->so_perstateid); 2576 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 2577 sop->so_time = 0; 2578 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 2579 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 2580 list_add(&sop->so_perstateid, &open_stp->st_lockowners); 2581 sop->so_is_open_owner = 0; 2582 sop->so_id = current_ownerid++; 2583 sop->so_client = clp; 2584 /* It is the openowner seqid that will be incremented in encode in the 2585 * case of new lockowners; so increment the lock seqid manually: */ 2586 sop->so_seqid = lock->lk_new_lock_seqid + 1; 2587 sop->so_confirmed = 1; 2588 rp = &sop->so_replay; 2589 rp->rp_status = nfserr_serverfault; 2590 rp->rp_buflen = 0; 2591 rp->rp_buf = rp->rp_ibuf; 2592 return sop; 2593 } 2594 2595 static struct nfs4_stateid * 2596 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 2597 { 2598 struct nfs4_stateid *stp; 2599 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 2600 2601 stp = nfs4_alloc_stateid(); 2602 if (stp == NULL) 2603 goto out; 2604 INIT_LIST_HEAD(&stp->st_hash); 2605 INIT_LIST_HEAD(&stp->st_perfile); 2606 INIT_LIST_HEAD(&stp->st_perstateowner); 2607 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ 2608 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 2609 list_add(&stp->st_perfile, &fp->fi_stateids); 2610 list_add(&stp->st_perstateowner, &sop->so_stateids); 2611 stp->st_stateowner = sop; 2612 get_nfs4_file(fp); 2613 stp->st_file = fp; 2614 stp->st_stateid.si_boot = boot_time; 2615 stp->st_stateid.si_stateownerid = sop->so_id; 2616 stp->st_stateid.si_fileid = fp->fi_id; 2617 stp->st_stateid.si_generation = 0; 2618 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */ 2619 stp->st_access_bmap = open_stp->st_access_bmap; 2620 stp->st_deny_bmap = open_stp->st_deny_bmap; 2621 stp->st_openstp = open_stp; 2622 2623 out: 2624 return stp; 2625 } 2626 2627 static int 2628 check_lock_length(u64 offset, u64 length) 2629 { 2630 return ((length == 0) || ((length != ~(u64)0) && 2631 LOFF_OVERFLOW(offset, length))); 2632 } 2633 2634 /* 2635 * LOCK operation 2636 */ 2637 int 2638 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner) 2639 { 2640 struct nfs4_stateowner *open_sop = NULL; 2641 struct nfs4_stateowner *lock_sop = NULL; 2642 struct nfs4_stateid *lock_stp; 2643 struct file *filp; 2644 struct file_lock file_lock; 2645 struct file_lock conflock; 2646 int status = 0; 2647 unsigned int strhashval; 2648 2649 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 2650 (long long) lock->lk_offset, 2651 (long long) lock->lk_length); 2652 2653 if (check_lock_length(lock->lk_offset, lock->lk_length)) 2654 return nfserr_inval; 2655 2656 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) { 2657 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 2658 return status; 2659 } 2660 2661 nfs4_lock_state(); 2662 2663 if (lock->lk_is_new) { 2664 /* 2665 * Client indicates that this is a new lockowner. 2666 * Use open owner and open stateid to create lock owner and 2667 * lock stateid. 2668 */ 2669 struct nfs4_stateid *open_stp = NULL; 2670 struct nfs4_file *fp; 2671 2672 status = nfserr_stale_clientid; 2673 if (STALE_CLIENTID(&lock->lk_new_clientid)) 2674 goto out; 2675 2676 /* validate and update open stateid and open seqid */ 2677 status = nfs4_preprocess_seqid_op(current_fh, 2678 lock->lk_new_open_seqid, 2679 &lock->lk_new_open_stateid, 2680 CHECK_FH | OPEN_STATE, 2681 &lock->lk_replay_owner, &open_stp, 2682 lock); 2683 if (status) 2684 goto out; 2685 open_sop = lock->lk_replay_owner; 2686 /* create lockowner and lock stateid */ 2687 fp = open_stp->st_file; 2688 strhashval = lock_ownerstr_hashval(fp->fi_inode, 2689 open_sop->so_client->cl_clientid.cl_id, 2690 &lock->v.new.owner); 2691 /* XXX: Do we need to check for duplicate stateowners on 2692 * the same file, or should they just be allowed (and 2693 * create new stateids)? */ 2694 status = nfserr_resource; 2695 lock_sop = alloc_init_lock_stateowner(strhashval, 2696 open_sop->so_client, open_stp, lock); 2697 if (lock_sop == NULL) 2698 goto out; 2699 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); 2700 if (lock_stp == NULL) 2701 goto out; 2702 } else { 2703 /* lock (lock owner + lock stateid) already exists */ 2704 status = nfs4_preprocess_seqid_op(current_fh, 2705 lock->lk_old_lock_seqid, 2706 &lock->lk_old_lock_stateid, 2707 CHECK_FH | LOCK_STATE, 2708 &lock->lk_replay_owner, &lock_stp, lock); 2709 if (status) 2710 goto out; 2711 lock_sop = lock->lk_replay_owner; 2712 } 2713 /* lock->lk_replay_owner and lock_stp have been created or found */ 2714 filp = lock_stp->st_vfs_file; 2715 2716 status = nfserr_grace; 2717 if (nfs4_in_grace() && !lock->lk_reclaim) 2718 goto out; 2719 status = nfserr_no_grace; 2720 if (!nfs4_in_grace() && lock->lk_reclaim) 2721 goto out; 2722 2723 locks_init_lock(&file_lock); 2724 switch (lock->lk_type) { 2725 case NFS4_READ_LT: 2726 case NFS4_READW_LT: 2727 file_lock.fl_type = F_RDLCK; 2728 break; 2729 case NFS4_WRITE_LT: 2730 case NFS4_WRITEW_LT: 2731 file_lock.fl_type = F_WRLCK; 2732 break; 2733 default: 2734 status = nfserr_inval; 2735 goto out; 2736 } 2737 file_lock.fl_owner = (fl_owner_t)lock_sop; 2738 file_lock.fl_pid = current->tgid; 2739 file_lock.fl_file = filp; 2740 file_lock.fl_flags = FL_POSIX; 2741 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2742 2743 file_lock.fl_start = lock->lk_offset; 2744 if ((lock->lk_length == ~(u64)0) || 2745 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length)) 2746 file_lock.fl_end = ~(u64)0; 2747 else 2748 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1; 2749 nfs4_transform_lock_offset(&file_lock); 2750 2751 /* 2752 * Try to lock the file in the VFS. 2753 * Note: locks.c uses the BKL to protect the inode's lock list. 2754 */ 2755 2756 /* XXX?: Just to divert the locks_release_private at the start of 2757 * locks_copy_lock: */ 2758 conflock.fl_ops = NULL; 2759 conflock.fl_lmops = NULL; 2760 status = posix_lock_file_conf(filp, &file_lock, &conflock); 2761 dprintk("NFSD: nfsd4_lock: posix_lock_file_conf status %d\n",status); 2762 switch (-status) { 2763 case 0: /* success! */ 2764 update_stateid(&lock_stp->st_stateid); 2765 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 2766 sizeof(stateid_t)); 2767 break; 2768 case (EAGAIN): /* conflock holds conflicting lock */ 2769 status = nfserr_denied; 2770 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 2771 nfs4_set_lock_denied(&conflock, &lock->lk_denied); 2772 break; 2773 case (EDEADLK): 2774 status = nfserr_deadlock; 2775 break; 2776 default: 2777 dprintk("NFSD: nfsd4_lock: posix_lock_file_conf() failed! status %d\n",status); 2778 status = nfserr_resource; 2779 break; 2780 } 2781 out: 2782 if (status && lock->lk_is_new && lock_sop) 2783 release_stateowner(lock_sop); 2784 if (lock->lk_replay_owner) { 2785 nfs4_get_stateowner(lock->lk_replay_owner); 2786 *replay_owner = lock->lk_replay_owner; 2787 } 2788 nfs4_unlock_state(); 2789 return status; 2790 } 2791 2792 /* 2793 * LOCKT operation 2794 */ 2795 int 2796 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt) 2797 { 2798 struct inode *inode; 2799 struct file file; 2800 struct file_lock file_lock; 2801 struct file_lock conflock; 2802 int status; 2803 2804 if (nfs4_in_grace()) 2805 return nfserr_grace; 2806 2807 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 2808 return nfserr_inval; 2809 2810 lockt->lt_stateowner = NULL; 2811 nfs4_lock_state(); 2812 2813 status = nfserr_stale_clientid; 2814 if (STALE_CLIENTID(&lockt->lt_clientid)) 2815 goto out; 2816 2817 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) { 2818 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 2819 if (status == nfserr_symlink) 2820 status = nfserr_inval; 2821 goto out; 2822 } 2823 2824 inode = current_fh->fh_dentry->d_inode; 2825 locks_init_lock(&file_lock); 2826 switch (lockt->lt_type) { 2827 case NFS4_READ_LT: 2828 case NFS4_READW_LT: 2829 file_lock.fl_type = F_RDLCK; 2830 break; 2831 case NFS4_WRITE_LT: 2832 case NFS4_WRITEW_LT: 2833 file_lock.fl_type = F_WRLCK; 2834 break; 2835 default: 2836 printk("NFSD: nfs4_lockt: bad lock type!\n"); 2837 status = nfserr_inval; 2838 goto out; 2839 } 2840 2841 lockt->lt_stateowner = find_lockstateowner_str(inode, 2842 &lockt->lt_clientid, &lockt->lt_owner); 2843 if (lockt->lt_stateowner) 2844 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 2845 file_lock.fl_pid = current->tgid; 2846 file_lock.fl_flags = FL_POSIX; 2847 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2848 2849 file_lock.fl_start = lockt->lt_offset; 2850 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length)) 2851 file_lock.fl_end = ~(u64)0; 2852 else 2853 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1; 2854 2855 nfs4_transform_lock_offset(&file_lock); 2856 2857 /* posix_test_lock uses the struct file _only_ to resolve the inode. 2858 * since LOCKT doesn't require an OPEN, and therefore a struct 2859 * file may not exist, pass posix_test_lock a struct file with 2860 * only the dentry:inode set. 2861 */ 2862 memset(&file, 0, sizeof (struct file)); 2863 file.f_dentry = current_fh->fh_dentry; 2864 2865 status = nfs_ok; 2866 if (posix_test_lock(&file, &file_lock, &conflock)) { 2867 status = nfserr_denied; 2868 nfs4_set_lock_denied(&conflock, &lockt->lt_denied); 2869 } 2870 out: 2871 nfs4_unlock_state(); 2872 return status; 2873 } 2874 2875 int 2876 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner) 2877 { 2878 struct nfs4_stateid *stp; 2879 struct file *filp = NULL; 2880 struct file_lock file_lock; 2881 int status; 2882 2883 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 2884 (long long) locku->lu_offset, 2885 (long long) locku->lu_length); 2886 2887 if (check_lock_length(locku->lu_offset, locku->lu_length)) 2888 return nfserr_inval; 2889 2890 nfs4_lock_state(); 2891 2892 if ((status = nfs4_preprocess_seqid_op(current_fh, 2893 locku->lu_seqid, 2894 &locku->lu_stateid, 2895 CHECK_FH | LOCK_STATE, 2896 &locku->lu_stateowner, &stp, NULL))) 2897 goto out; 2898 2899 filp = stp->st_vfs_file; 2900 BUG_ON(!filp); 2901 locks_init_lock(&file_lock); 2902 file_lock.fl_type = F_UNLCK; 2903 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 2904 file_lock.fl_pid = current->tgid; 2905 file_lock.fl_file = filp; 2906 file_lock.fl_flags = FL_POSIX; 2907 file_lock.fl_lmops = &nfsd_posix_mng_ops; 2908 file_lock.fl_start = locku->lu_offset; 2909 2910 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length)) 2911 file_lock.fl_end = ~(u64)0; 2912 else 2913 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1; 2914 nfs4_transform_lock_offset(&file_lock); 2915 2916 /* 2917 * Try to unlock the file in the VFS. 2918 */ 2919 status = posix_lock_file(filp, &file_lock); 2920 if (status) { 2921 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n"); 2922 goto out_nfserr; 2923 } 2924 /* 2925 * OK, unlock succeeded; the only thing left to do is update the stateid. 2926 */ 2927 update_stateid(&stp->st_stateid); 2928 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 2929 2930 out: 2931 if (locku->lu_stateowner) { 2932 nfs4_get_stateowner(locku->lu_stateowner); 2933 *replay_owner = locku->lu_stateowner; 2934 } 2935 nfs4_unlock_state(); 2936 return status; 2937 2938 out_nfserr: 2939 status = nfserrno(status); 2940 goto out; 2941 } 2942 2943 /* 2944 * returns 2945 * 1: locks held by lockowner 2946 * 0: no locks held by lockowner 2947 */ 2948 static int 2949 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner) 2950 { 2951 struct file_lock **flpp; 2952 struct inode *inode = filp->f_dentry->d_inode; 2953 int status = 0; 2954 2955 lock_kernel(); 2956 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 2957 if ((*flpp)->fl_owner == (fl_owner_t)lowner) { 2958 status = 1; 2959 goto out; 2960 } 2961 } 2962 out: 2963 unlock_kernel(); 2964 return status; 2965 } 2966 2967 int 2968 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner) 2969 { 2970 clientid_t *clid = &rlockowner->rl_clientid; 2971 struct nfs4_stateowner *sop; 2972 struct nfs4_stateid *stp; 2973 struct xdr_netobj *owner = &rlockowner->rl_owner; 2974 struct list_head matches; 2975 int i; 2976 int status; 2977 2978 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 2979 clid->cl_boot, clid->cl_id); 2980 2981 /* XXX check for lease expiration */ 2982 2983 status = nfserr_stale_clientid; 2984 if (STALE_CLIENTID(clid)) 2985 return status; 2986 2987 nfs4_lock_state(); 2988 2989 status = nfserr_locks_held; 2990 /* XXX: we're doing a linear search through all the lockowners. 2991 * Yipes! For now we'll just hope clients aren't really using 2992 * release_lockowner much, but eventually we have to fix these 2993 * data structures. */ 2994 INIT_LIST_HEAD(&matches); 2995 for (i = 0; i < LOCK_HASH_SIZE; i++) { 2996 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { 2997 if (!cmp_owner_str(sop, owner, clid)) 2998 continue; 2999 list_for_each_entry(stp, &sop->so_stateids, 3000 st_perstateowner) { 3001 if (check_for_locks(stp->st_vfs_file, sop)) 3002 goto out; 3003 /* Note: so_perclient unused for lockowners, 3004 * so it's OK to fool with here. */ 3005 list_add(&sop->so_perclient, &matches); 3006 } 3007 } 3008 } 3009 /* Clients probably won't expect us to return with some (but not all) 3010 * of the lockowner state released; so don't release any until all 3011 * have been checked. */ 3012 status = nfs_ok; 3013 while (!list_empty(&matches)) { 3014 sop = list_entry(matches.next, struct nfs4_stateowner, 3015 so_perclient); 3016 /* unhash_stateowner deletes so_perclient only 3017 * for openowners. */ 3018 list_del(&sop->so_perclient); 3019 release_stateowner(sop); 3020 } 3021 out: 3022 nfs4_unlock_state(); 3023 return status; 3024 } 3025 3026 static inline struct nfs4_client_reclaim * 3027 alloc_reclaim(void) 3028 { 3029 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 3030 } 3031 3032 int 3033 nfs4_has_reclaimed_state(const char *name) 3034 { 3035 unsigned int strhashval = clientstr_hashval(name); 3036 struct nfs4_client *clp; 3037 3038 clp = find_confirmed_client_by_str(name, strhashval); 3039 return clp ? 1 : 0; 3040 } 3041 3042 /* 3043 * failure => all reset bets are off, nfserr_no_grace... 3044 */ 3045 int 3046 nfs4_client_to_reclaim(const char *name) 3047 { 3048 unsigned int strhashval; 3049 struct nfs4_client_reclaim *crp = NULL; 3050 3051 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 3052 crp = alloc_reclaim(); 3053 if (!crp) 3054 return 0; 3055 strhashval = clientstr_hashval(name); 3056 INIT_LIST_HEAD(&crp->cr_strhash); 3057 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 3058 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 3059 reclaim_str_hashtbl_size++; 3060 return 1; 3061 } 3062 3063 static void 3064 nfs4_release_reclaim(void) 3065 { 3066 struct nfs4_client_reclaim *crp = NULL; 3067 int i; 3068 3069 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3070 while (!list_empty(&reclaim_str_hashtbl[i])) { 3071 crp = list_entry(reclaim_str_hashtbl[i].next, 3072 struct nfs4_client_reclaim, cr_strhash); 3073 list_del(&crp->cr_strhash); 3074 kfree(crp); 3075 reclaim_str_hashtbl_size--; 3076 } 3077 } 3078 BUG_ON(reclaim_str_hashtbl_size); 3079 } 3080 3081 /* 3082 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 3083 static struct nfs4_client_reclaim * 3084 nfs4_find_reclaim_client(clientid_t *clid) 3085 { 3086 unsigned int strhashval; 3087 struct nfs4_client *clp; 3088 struct nfs4_client_reclaim *crp = NULL; 3089 3090 3091 /* find clientid in conf_id_hashtbl */ 3092 clp = find_confirmed_client(clid); 3093 if (clp == NULL) 3094 return NULL; 3095 3096 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", 3097 clp->cl_name.len, clp->cl_name.data, 3098 clp->cl_recdir); 3099 3100 /* find clp->cl_name in reclaim_str_hashtbl */ 3101 strhashval = clientstr_hashval(clp->cl_recdir); 3102 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 3103 if (same_name(crp->cr_recdir, clp->cl_recdir)) { 3104 return crp; 3105 } 3106 } 3107 return NULL; 3108 } 3109 3110 /* 3111 * Called from OPEN. Look for clientid in reclaim list. 3112 */ 3113 int 3114 nfs4_check_open_reclaim(clientid_t *clid) 3115 { 3116 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; 3117 } 3118 3119 /* initialization to perform at module load time: */ 3120 3121 void 3122 nfs4_state_init(void) 3123 { 3124 int i; 3125 3126 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3127 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 3128 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 3129 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 3130 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 3131 } 3132 for (i = 0; i < FILE_HASH_SIZE; i++) { 3133 INIT_LIST_HEAD(&file_hashtbl[i]); 3134 } 3135 for (i = 0; i < OWNER_HASH_SIZE; i++) { 3136 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 3137 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 3138 } 3139 for (i = 0; i < STATEID_HASH_SIZE; i++) { 3140 INIT_LIST_HEAD(&stateid_hashtbl[i]); 3141 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 3142 } 3143 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3144 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 3145 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 3146 } 3147 memset(&onestateid, ~0, sizeof(stateid_t)); 3148 INIT_LIST_HEAD(&close_lru); 3149 INIT_LIST_HEAD(&client_lru); 3150 INIT_LIST_HEAD(&del_recall_lru); 3151 for (i = 0; i < CLIENT_HASH_SIZE; i++) 3152 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 3153 reclaim_str_hashtbl_size = 0; 3154 } 3155 3156 static void 3157 nfsd4_load_reboot_recovery_data(void) 3158 { 3159 int status; 3160 3161 nfs4_lock_state(); 3162 nfsd4_init_recdir(user_recovery_dirname); 3163 status = nfsd4_recdir_load(); 3164 nfs4_unlock_state(); 3165 if (status) 3166 printk("NFSD: Failure reading reboot recovery data\n"); 3167 } 3168 3169 /* initialization to perform when the nfsd service is started: */ 3170 3171 static void 3172 __nfs4_state_start(void) 3173 { 3174 time_t grace_time; 3175 3176 boot_time = get_seconds(); 3177 grace_time = max(user_lease_time, lease_time); 3178 lease_time = user_lease_time; 3179 in_grace = 1; 3180 printk("NFSD: starting %ld-second grace period\n", grace_time); 3181 laundry_wq = create_singlethread_workqueue("nfsd4"); 3182 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ); 3183 } 3184 3185 int 3186 nfs4_state_start(void) 3187 { 3188 int status; 3189 3190 if (nfs4_init) 3191 return 0; 3192 status = nfsd4_init_slabs(); 3193 if (status) 3194 return status; 3195 nfsd4_load_reboot_recovery_data(); 3196 __nfs4_state_start(); 3197 nfs4_init = 1; 3198 return 0; 3199 } 3200 3201 int 3202 nfs4_in_grace(void) 3203 { 3204 return in_grace; 3205 } 3206 3207 time_t 3208 nfs4_lease_time(void) 3209 { 3210 return lease_time; 3211 } 3212 3213 static void 3214 __nfs4_state_shutdown(void) 3215 { 3216 int i; 3217 struct nfs4_client *clp = NULL; 3218 struct nfs4_delegation *dp = NULL; 3219 struct list_head *pos, *next, reaplist; 3220 3221 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3222 while (!list_empty(&conf_id_hashtbl[i])) { 3223 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 3224 expire_client(clp); 3225 } 3226 while (!list_empty(&unconf_str_hashtbl[i])) { 3227 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 3228 expire_client(clp); 3229 } 3230 } 3231 INIT_LIST_HEAD(&reaplist); 3232 spin_lock(&recall_lock); 3233 list_for_each_safe(pos, next, &del_recall_lru) { 3234 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3235 list_move(&dp->dl_recall_lru, &reaplist); 3236 } 3237 spin_unlock(&recall_lock); 3238 list_for_each_safe(pos, next, &reaplist) { 3239 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3240 list_del_init(&dp->dl_recall_lru); 3241 unhash_delegation(dp); 3242 } 3243 3244 cancel_delayed_work(&laundromat_work); 3245 nfsd4_shutdown_recdir(); 3246 nfs4_init = 0; 3247 } 3248 3249 void 3250 nfs4_state_shutdown(void) 3251 { 3252 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); 3253 destroy_workqueue(laundry_wq); 3254 nfs4_lock_state(); 3255 nfs4_release_reclaim(); 3256 __nfs4_state_shutdown(); 3257 nfsd4_free_slabs(); 3258 nfs4_unlock_state(); 3259 } 3260 3261 static void 3262 nfs4_set_recdir(char *recdir) 3263 { 3264 nfs4_lock_state(); 3265 strcpy(user_recovery_dirname, recdir); 3266 nfs4_unlock_state(); 3267 } 3268 3269 /* 3270 * Change the NFSv4 recovery directory to recdir. 3271 */ 3272 int 3273 nfs4_reset_recoverydir(char *recdir) 3274 { 3275 int status; 3276 struct nameidata nd; 3277 3278 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd); 3279 if (status) 3280 return status; 3281 status = -ENOTDIR; 3282 if (S_ISDIR(nd.dentry->d_inode->i_mode)) { 3283 nfs4_set_recdir(recdir); 3284 status = 0; 3285 } 3286 path_release(&nd); 3287 return status; 3288 } 3289 3290 /* 3291 * Called when leasetime is changed. 3292 * 3293 * The only way the protocol gives us to handle on-the-fly lease changes is to 3294 * simulate a reboot. Instead of doing that, we just wait till the next time 3295 * we start to register any changes in lease time. If the administrator 3296 * really wants to change the lease time *now*, they can go ahead and bring 3297 * nfsd down and then back up again after changing the lease time. 3298 */ 3299 void 3300 nfs4_reset_lease(time_t leasetime) 3301 { 3302 lock_kernel(); 3303 user_lease_time = leasetime; 3304 unlock_kernel(); 3305 } 3306