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 52 #define NFSDDBG_FACILITY NFSDDBG_PROC 53 54 /* Globals */ 55 static time_t lease_time = 90; /* default lease time */ 56 static time_t old_lease_time = 90; /* past incarnation lease time */ 57 static u32 nfs4_reclaim_init = 0; 58 time_t boot_time; 59 static time_t grace_end = 0; 60 static u32 current_clientid = 1; 61 static u32 current_ownerid = 1; 62 static u32 current_fileid = 1; 63 static u32 current_delegid = 1; 64 static u32 nfs4_init; 65 stateid_t zerostateid; /* bits all 0 */ 66 stateid_t onestateid; /* bits all 1 */ 67 68 /* debug counters */ 69 u32 list_add_perfile = 0; 70 u32 list_del_perfile = 0; 71 u32 add_perclient = 0; 72 u32 del_perclient = 0; 73 u32 alloc_file = 0; 74 u32 free_file = 0; 75 u32 vfsopen = 0; 76 u32 vfsclose = 0; 77 u32 alloc_delegation= 0; 78 u32 free_delegation= 0; 79 80 /* forward declarations */ 81 struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); 82 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); 83 static void release_stateid_lockowners(struct nfs4_stateid *open_stp); 84 85 /* Locking: 86 * 87 * client_sema: 88 * protects clientid_hashtbl[], clientstr_hashtbl[], 89 * unconfstr_hashtbl[], uncofid_hashtbl[]. 90 */ 91 static DECLARE_MUTEX(client_sema); 92 93 void 94 nfs4_lock_state(void) 95 { 96 down(&client_sema); 97 } 98 99 void 100 nfs4_unlock_state(void) 101 { 102 up(&client_sema); 103 } 104 105 static inline u32 106 opaque_hashval(const void *ptr, int nbytes) 107 { 108 unsigned char *cptr = (unsigned char *) ptr; 109 110 u32 x = 0; 111 while (nbytes--) { 112 x *= 37; 113 x += *cptr++; 114 } 115 return x; 116 } 117 118 /* forward declarations */ 119 static void release_stateowner(struct nfs4_stateowner *sop); 120 static void release_stateid(struct nfs4_stateid *stp, int flags); 121 static void release_file(struct nfs4_file *fp); 122 123 /* 124 * Delegation state 125 */ 126 127 /* recall_lock protects the del_recall_lru */ 128 spinlock_t recall_lock; 129 static struct list_head del_recall_lru; 130 131 static struct nfs4_delegation * 132 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 133 { 134 struct nfs4_delegation *dp; 135 struct nfs4_file *fp = stp->st_file; 136 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback; 137 138 dprintk("NFSD alloc_init_deleg\n"); 139 if ((dp = kmalloc(sizeof(struct nfs4_delegation), 140 GFP_KERNEL)) == NULL) 141 return dp; 142 INIT_LIST_HEAD(&dp->dl_del_perfile); 143 INIT_LIST_HEAD(&dp->dl_del_perclnt); 144 INIT_LIST_HEAD(&dp->dl_recall_lru); 145 dp->dl_client = clp; 146 dp->dl_file = fp; 147 dp->dl_flock = NULL; 148 get_file(stp->st_vfs_file); 149 dp->dl_vfs_file = stp->st_vfs_file; 150 dp->dl_type = type; 151 dp->dl_recall.cbr_dp = NULL; 152 dp->dl_recall.cbr_ident = cb->cb_ident; 153 dp->dl_recall.cbr_trunc = 0; 154 dp->dl_stateid.si_boot = boot_time; 155 dp->dl_stateid.si_stateownerid = current_delegid++; 156 dp->dl_stateid.si_fileid = 0; 157 dp->dl_stateid.si_generation = 0; 158 dp->dl_fhlen = current_fh->fh_handle.fh_size; 159 memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base, 160 current_fh->fh_handle.fh_size); 161 dp->dl_time = 0; 162 atomic_set(&dp->dl_count, 1); 163 list_add(&dp->dl_del_perfile, &fp->fi_del_perfile); 164 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt); 165 alloc_delegation++; 166 return dp; 167 } 168 169 void 170 nfs4_put_delegation(struct nfs4_delegation *dp) 171 { 172 if (atomic_dec_and_test(&dp->dl_count)) { 173 dprintk("NFSD: freeing dp %p\n",dp); 174 kfree(dp); 175 free_delegation++; 176 } 177 } 178 179 /* Remove the associated file_lock first, then remove the delegation. 180 * lease_modify() is called to remove the FS_LEASE file_lock from 181 * the i_flock list, eventually calling nfsd's lock_manager 182 * fl_release_callback. 183 */ 184 static void 185 nfs4_close_delegation(struct nfs4_delegation *dp) 186 { 187 struct file *filp = dp->dl_vfs_file; 188 189 dprintk("NFSD: close_delegation dp %p\n",dp); 190 dp->dl_vfs_file = NULL; 191 /* The following nfsd_close may not actually close the file, 192 * but we want to remove the lease in any case. */ 193 setlease(filp, F_UNLCK, &dp->dl_flock); 194 nfsd_close(filp); 195 vfsclose++; 196 } 197 198 /* Called under the state lock. */ 199 static void 200 unhash_delegation(struct nfs4_delegation *dp) 201 { 202 list_del_init(&dp->dl_del_perfile); 203 list_del_init(&dp->dl_del_perclnt); 204 spin_lock(&recall_lock); 205 list_del_init(&dp->dl_recall_lru); 206 spin_unlock(&recall_lock); 207 nfs4_close_delegation(dp); 208 nfs4_put_delegation(dp); 209 } 210 211 /* 212 * SETCLIENTID state 213 */ 214 215 /* Hash tables for nfs4_clientid state */ 216 #define CLIENT_HASH_BITS 4 217 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 218 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 219 220 #define clientid_hashval(id) \ 221 ((id) & CLIENT_HASH_MASK) 222 #define clientstr_hashval(name, namelen) \ 223 (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK) 224 /* 225 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 226 * used in reboot/reset lease grace period processing 227 * 228 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 229 * setclientid_confirmed info. 230 * 231 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 232 * setclientid info. 233 * 234 * client_lru holds client queue ordered by nfs4_client.cl_time 235 * for lease renewal. 236 * 237 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 238 * for last close replay. 239 */ 240 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 241 static int reclaim_str_hashtbl_size = 0; 242 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 243 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 244 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 245 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 246 static struct list_head client_lru; 247 static struct list_head close_lru; 248 249 static inline void 250 renew_client(struct nfs4_client *clp) 251 { 252 /* 253 * Move client to the end to the LRU list. 254 */ 255 dprintk("renewing client (clientid %08x/%08x)\n", 256 clp->cl_clientid.cl_boot, 257 clp->cl_clientid.cl_id); 258 list_move_tail(&clp->cl_lru, &client_lru); 259 clp->cl_time = get_seconds(); 260 } 261 262 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 263 static int 264 STALE_CLIENTID(clientid_t *clid) 265 { 266 if (clid->cl_boot == boot_time) 267 return 0; 268 dprintk("NFSD stale clientid (%08x/%08x)\n", 269 clid->cl_boot, clid->cl_id); 270 return 1; 271 } 272 273 /* 274 * XXX Should we use a slab cache ? 275 * This type of memory management is somewhat inefficient, but we use it 276 * anyway since SETCLIENTID is not a common operation. 277 */ 278 static inline struct nfs4_client * 279 alloc_client(struct xdr_netobj name) 280 { 281 struct nfs4_client *clp; 282 283 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) { 284 memset(clp, 0, sizeof(*clp)); 285 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) { 286 memcpy(clp->cl_name.data, name.data, name.len); 287 clp->cl_name.len = name.len; 288 } 289 else { 290 kfree(clp); 291 clp = NULL; 292 } 293 } 294 return clp; 295 } 296 297 static inline void 298 free_client(struct nfs4_client *clp) 299 { 300 if (clp->cl_cred.cr_group_info) 301 put_group_info(clp->cl_cred.cr_group_info); 302 kfree(clp->cl_name.data); 303 kfree(clp); 304 } 305 306 void 307 put_nfs4_client(struct nfs4_client *clp) 308 { 309 if (atomic_dec_and_test(&clp->cl_count)) 310 free_client(clp); 311 } 312 313 static void 314 expire_client(struct nfs4_client *clp) 315 { 316 struct nfs4_stateowner *sop; 317 struct nfs4_delegation *dp; 318 struct nfs4_callback *cb = &clp->cl_callback; 319 struct rpc_clnt *clnt = clp->cl_callback.cb_client; 320 struct list_head reaplist; 321 322 dprintk("NFSD: expire_client cl_count %d\n", 323 atomic_read(&clp->cl_count)); 324 325 /* shutdown rpc client, ending any outstanding recall rpcs */ 326 if (atomic_read(&cb->cb_set) == 1 && clnt) { 327 rpc_shutdown_client(clnt); 328 clnt = clp->cl_callback.cb_client = NULL; 329 } 330 331 INIT_LIST_HEAD(&reaplist); 332 spin_lock(&recall_lock); 333 while (!list_empty(&clp->cl_del_perclnt)) { 334 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt); 335 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 336 dp->dl_flock); 337 list_del_init(&dp->dl_del_perclnt); 338 list_move(&dp->dl_recall_lru, &reaplist); 339 } 340 spin_unlock(&recall_lock); 341 while (!list_empty(&reaplist)) { 342 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 343 list_del_init(&dp->dl_recall_lru); 344 unhash_delegation(dp); 345 } 346 list_del(&clp->cl_idhash); 347 list_del(&clp->cl_strhash); 348 list_del(&clp->cl_lru); 349 while (!list_empty(&clp->cl_perclient)) { 350 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient); 351 release_stateowner(sop); 352 } 353 put_nfs4_client(clp); 354 } 355 356 static struct nfs4_client * 357 create_client(struct xdr_netobj name) { 358 struct nfs4_client *clp; 359 360 if (!(clp = alloc_client(name))) 361 goto out; 362 atomic_set(&clp->cl_count, 1); 363 atomic_set(&clp->cl_callback.cb_set, 0); 364 clp->cl_callback.cb_parsed = 0; 365 INIT_LIST_HEAD(&clp->cl_idhash); 366 INIT_LIST_HEAD(&clp->cl_strhash); 367 INIT_LIST_HEAD(&clp->cl_perclient); 368 INIT_LIST_HEAD(&clp->cl_del_perclnt); 369 INIT_LIST_HEAD(&clp->cl_lru); 370 out: 371 return clp; 372 } 373 374 static void 375 copy_verf(struct nfs4_client *target, nfs4_verifier *source) { 376 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data)); 377 } 378 379 static void 380 copy_clid(struct nfs4_client *target, struct nfs4_client *source) { 381 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 382 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 383 } 384 385 static void 386 copy_cred(struct svc_cred *target, struct svc_cred *source) { 387 388 target->cr_uid = source->cr_uid; 389 target->cr_gid = source->cr_gid; 390 target->cr_group_info = source->cr_group_info; 391 get_group_info(target->cr_group_info); 392 } 393 394 static int 395 cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) { 396 if (!n1 || !n2) 397 return 0; 398 return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len)); 399 } 400 401 static int 402 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) { 403 return(!memcmp(v1->data,v2->data,sizeof(v1->data))); 404 } 405 406 static int 407 cmp_clid(clientid_t * cl1, clientid_t * cl2) { 408 return((cl1->cl_boot == cl2->cl_boot) && 409 (cl1->cl_id == cl2->cl_id)); 410 } 411 412 /* XXX what about NGROUP */ 413 static int 414 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){ 415 return(cr1->cr_uid == cr2->cr_uid); 416 417 } 418 419 static void 420 gen_clid(struct nfs4_client *clp) { 421 clp->cl_clientid.cl_boot = boot_time; 422 clp->cl_clientid.cl_id = current_clientid++; 423 } 424 425 static void 426 gen_confirm(struct nfs4_client *clp) { 427 struct timespec tv; 428 u32 * p; 429 430 tv = CURRENT_TIME; 431 p = (u32 *)clp->cl_confirm.data; 432 *p++ = tv.tv_sec; 433 *p++ = tv.tv_nsec; 434 } 435 436 static int 437 check_name(struct xdr_netobj name) { 438 439 if (name.len == 0) 440 return 0; 441 if (name.len > NFS4_OPAQUE_LIMIT) { 442 printk("NFSD: check_name: name too long(%d)!\n", name.len); 443 return 0; 444 } 445 return 1; 446 } 447 448 void 449 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 450 { 451 unsigned int idhashval; 452 453 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 454 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 455 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 456 list_add_tail(&clp->cl_lru, &client_lru); 457 clp->cl_time = get_seconds(); 458 } 459 460 void 461 move_to_confirmed(struct nfs4_client *clp) 462 { 463 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 464 unsigned int strhashval; 465 466 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 467 list_del_init(&clp->cl_strhash); 468 list_del_init(&clp->cl_idhash); 469 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 470 strhashval = clientstr_hashval(clp->cl_name.data, 471 clp->cl_name.len); 472 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 473 renew_client(clp); 474 } 475 476 static struct nfs4_client * 477 find_confirmed_client(clientid_t *clid) 478 { 479 struct nfs4_client *clp; 480 unsigned int idhashval = clientid_hashval(clid->cl_id); 481 482 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 483 if (cmp_clid(&clp->cl_clientid, clid)) 484 return clp; 485 } 486 return NULL; 487 } 488 489 static struct nfs4_client * 490 find_unconfirmed_client(clientid_t *clid) 491 { 492 struct nfs4_client *clp; 493 unsigned int idhashval = clientid_hashval(clid->cl_id); 494 495 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 496 if (cmp_clid(&clp->cl_clientid, clid)) 497 return clp; 498 } 499 return NULL; 500 } 501 502 /* a helper function for parse_callback */ 503 static int 504 parse_octet(unsigned int *lenp, char **addrp) 505 { 506 unsigned int len = *lenp; 507 char *p = *addrp; 508 int n = -1; 509 char c; 510 511 for (;;) { 512 if (!len) 513 break; 514 len--; 515 c = *p++; 516 if (c == '.') 517 break; 518 if ((c < '0') || (c > '9')) { 519 n = -1; 520 break; 521 } 522 if (n < 0) 523 n = 0; 524 n = (n * 10) + (c - '0'); 525 if (n > 255) { 526 n = -1; 527 break; 528 } 529 } 530 *lenp = len; 531 *addrp = p; 532 return n; 533 } 534 535 /* parse and set the setclientid ipv4 callback address */ 536 int 537 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp) 538 { 539 int temp = 0; 540 u32 cbaddr = 0; 541 u16 cbport = 0; 542 u32 addrlen = addr_len; 543 char *addr = addr_val; 544 int i, shift; 545 546 /* ipaddress */ 547 shift = 24; 548 for(i = 4; i > 0 ; i--) { 549 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 550 return 0; 551 } 552 cbaddr |= (temp << shift); 553 if (shift > 0) 554 shift -= 8; 555 } 556 *cbaddrp = cbaddr; 557 558 /* port */ 559 shift = 8; 560 for(i = 2; i > 0 ; i--) { 561 if ((temp = parse_octet(&addrlen, &addr)) < 0) { 562 return 0; 563 } 564 cbport |= (temp << shift); 565 if (shift > 0) 566 shift -= 8; 567 } 568 *cbportp = cbport; 569 return 1; 570 } 571 572 void 573 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se) 574 { 575 struct nfs4_callback *cb = &clp->cl_callback; 576 577 /* Currently, we only support tcp for the callback channel */ 578 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3)) 579 goto out_err; 580 581 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val, 582 &cb->cb_addr, &cb->cb_port))) 583 goto out_err; 584 cb->cb_prog = se->se_callback_prog; 585 cb->cb_ident = se->se_callback_ident; 586 cb->cb_parsed = 1; 587 return; 588 out_err: 589 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 590 "will not receive delegations\n", 591 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 592 593 cb->cb_parsed = 0; 594 return; 595 } 596 597 /* 598 * RFC 3010 has a complex implmentation description of processing a 599 * SETCLIENTID request consisting of 5 bullets, labeled as 600 * CASE0 - CASE4 below. 601 * 602 * NOTES: 603 * callback information will be processed in a future patch 604 * 605 * an unconfirmed record is added when: 606 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record. 607 * CASE 1: confirmed record found with matching name, principal, 608 * verifier, and clientid. 609 * CASE 2: confirmed record found with matching name, principal, 610 * and there is no unconfirmed record with matching 611 * name and principal 612 * 613 * an unconfirmed record is replaced when: 614 * CASE 3: confirmed record found with matching name, principal, 615 * and an unconfirmed record is found with matching 616 * name, principal, and with clientid and 617 * confirm that does not match the confirmed record. 618 * CASE 4: there is no confirmed record with matching name and 619 * principal. there is an unconfirmed record with 620 * matching name, principal. 621 * 622 * an unconfirmed record is deleted when: 623 * CASE 1: an unconfirmed record that matches input name, verifier, 624 * and confirmed clientid. 625 * CASE 4: any unconfirmed records with matching name and principal 626 * that exist after an unconfirmed record has been replaced 627 * as described above. 628 * 629 */ 630 int 631 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid) 632 { 633 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr; 634 struct xdr_netobj clname = { 635 .len = setclid->se_namelen, 636 .data = setclid->se_name, 637 }; 638 nfs4_verifier clverifier = setclid->se_verf; 639 unsigned int strhashval; 640 struct nfs4_client * conf, * unconf, * new, * clp; 641 int status; 642 643 status = nfserr_inval; 644 if (!check_name(clname)) 645 goto out; 646 647 /* 648 * XXX The Duplicate Request Cache (DRC) has been checked (??) 649 * We get here on a DRC miss. 650 */ 651 652 strhashval = clientstr_hashval(clname.data, clname.len); 653 654 conf = NULL; 655 nfs4_lock_state(); 656 list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) { 657 if (!cmp_name(&clp->cl_name, &clname)) 658 continue; 659 /* 660 * CASE 0: 661 * clname match, confirmed, different principal 662 * or different ip_address 663 */ 664 status = nfserr_clid_inuse; 665 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) { 666 printk("NFSD: setclientid: string in use by client" 667 "(clientid %08x/%08x)\n", 668 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 669 goto out; 670 } 671 if (clp->cl_addr != ip_addr) { 672 printk("NFSD: setclientid: string in use by client" 673 "(clientid %08x/%08x)\n", 674 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 675 goto out; 676 } 677 678 /* 679 * cl_name match from a previous SETCLIENTID operation 680 * XXX check for additional matches? 681 */ 682 conf = clp; 683 break; 684 } 685 unconf = NULL; 686 list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) { 687 if (!cmp_name(&clp->cl_name, &clname)) 688 continue; 689 /* cl_name match from a previous SETCLIENTID operation */ 690 unconf = clp; 691 break; 692 } 693 status = nfserr_resource; 694 if (!conf) { 695 /* 696 * CASE 4: 697 * placed first, because it is the normal case. 698 */ 699 if (unconf) 700 expire_client(unconf); 701 if (!(new = create_client(clname))) 702 goto out; 703 copy_verf(new, &clverifier); 704 new->cl_addr = ip_addr; 705 copy_cred(&new->cl_cred,&rqstp->rq_cred); 706 gen_clid(new); 707 gen_confirm(new); 708 gen_callback(new, setclid); 709 add_to_unconfirmed(new, strhashval); 710 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) { 711 /* 712 * CASE 1: 713 * cl_name match, confirmed, principal match 714 * verifier match: probable callback update 715 * 716 * remove any unconfirmed nfs4_client with 717 * matching cl_name, cl_verifier, and cl_clientid 718 * 719 * create and insert an unconfirmed nfs4_client with same 720 * cl_name, cl_verifier, and cl_clientid as existing 721 * nfs4_client, but with the new callback info and a 722 * new cl_confirm 723 */ 724 if ((unconf) && 725 cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) && 726 cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) { 727 expire_client(unconf); 728 } 729 if (!(new = create_client(clname))) 730 goto out; 731 copy_verf(new,&conf->cl_verifier); 732 new->cl_addr = ip_addr; 733 copy_cred(&new->cl_cred,&rqstp->rq_cred); 734 copy_clid(new, conf); 735 gen_confirm(new); 736 gen_callback(new, setclid); 737 add_to_unconfirmed(new,strhashval); 738 } else if (!unconf) { 739 /* 740 * CASE 2: 741 * clname match, confirmed, principal match 742 * verfier does not match 743 * no unconfirmed. create a new unconfirmed nfs4_client 744 * using input clverifier, clname, and callback info 745 * and generate a new cl_clientid and cl_confirm. 746 */ 747 if (!(new = create_client(clname))) 748 goto out; 749 copy_verf(new,&clverifier); 750 new->cl_addr = ip_addr; 751 copy_cred(&new->cl_cred,&rqstp->rq_cred); 752 gen_clid(new); 753 gen_confirm(new); 754 gen_callback(new, setclid); 755 add_to_unconfirmed(new, strhashval); 756 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) { 757 /* 758 * CASE3: 759 * confirmed found (name, principal match) 760 * confirmed verifier does not match input clverifier 761 * 762 * unconfirmed found (name match) 763 * confirmed->cl_confirm != unconfirmed->cl_confirm 764 * 765 * remove unconfirmed. 766 * 767 * create an unconfirmed nfs4_client 768 * with same cl_name as existing confirmed nfs4_client, 769 * but with new callback info, new cl_clientid, 770 * new cl_verifier and a new cl_confirm 771 */ 772 expire_client(unconf); 773 if (!(new = create_client(clname))) 774 goto out; 775 copy_verf(new,&clverifier); 776 new->cl_addr = ip_addr; 777 copy_cred(&new->cl_cred,&rqstp->rq_cred); 778 gen_clid(new); 779 gen_confirm(new); 780 gen_callback(new, setclid); 781 add_to_unconfirmed(new, strhashval); 782 } else { 783 /* No cases hit !!! */ 784 status = nfserr_inval; 785 goto out; 786 787 } 788 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 789 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 790 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 791 status = nfs_ok; 792 out: 793 nfs4_unlock_state(); 794 return status; 795 } 796 797 798 /* 799 * RFC 3010 has a complex implmentation description of processing a 800 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing 801 * processing on a DRC miss, labeled as CASE1 - CASE4 below. 802 * 803 * NOTE: callback information will be processed here in a future patch 804 */ 805 int 806 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm) 807 { 808 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr; 809 struct nfs4_client *clp, *conf = NULL, *unconf = NULL; 810 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 811 clientid_t * clid = &setclientid_confirm->sc_clientid; 812 int status; 813 814 if (STALE_CLIENTID(clid)) 815 return nfserr_stale_clientid; 816 /* 817 * XXX The Duplicate Request Cache (DRC) has been checked (??) 818 * We get here on a DRC miss. 819 */ 820 821 nfs4_lock_state(); 822 clp = find_confirmed_client(clid); 823 if (clp) { 824 status = nfserr_inval; 825 /* 826 * Found a record for this clientid. If the IP addresses 827 * don't match, return ERR_INVAL just as if the record had 828 * not been found. 829 */ 830 if (clp->cl_addr != ip_addr) { 831 printk("NFSD: setclientid: string in use by client" 832 "(clientid %08x/%08x)\n", 833 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 834 goto out; 835 } 836 conf = clp; 837 } 838 clp = find_unconfirmed_client(clid); 839 if (clp) { 840 status = nfserr_inval; 841 if (clp->cl_addr != ip_addr) { 842 printk("NFSD: setclientid: string in use by client" 843 "(clientid %08x/%08x)\n", 844 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 845 goto out; 846 } 847 unconf = clp; 848 } 849 /* CASE 1: 850 * unconf record that matches input clientid and input confirm. 851 * conf record that matches input clientid. 852 * conf and unconf records match names, verifiers 853 */ 854 if ((conf && unconf) && 855 (cmp_verf(&unconf->cl_confirm, &confirm)) && 856 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) && 857 (cmp_name(&conf->cl_name,&unconf->cl_name)) && 858 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) { 859 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 860 status = nfserr_clid_inuse; 861 else { 862 expire_client(conf); 863 clp = unconf; 864 move_to_confirmed(unconf); 865 status = nfs_ok; 866 } 867 goto out; 868 } 869 /* CASE 2: 870 * conf record that matches input clientid. 871 * if unconf record that matches input clientid, then unconf->cl_name 872 * or unconf->cl_verifier don't match the conf record. 873 */ 874 if ((conf && !unconf) || 875 ((conf && unconf) && 876 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) || 877 !cmp_name(&conf->cl_name, &unconf->cl_name)))) { 878 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) { 879 status = nfserr_clid_inuse; 880 } else { 881 clp = conf; 882 status = nfs_ok; 883 } 884 goto out; 885 } 886 /* CASE 3: 887 * conf record not found. 888 * unconf record found. 889 * unconf->cl_confirm matches input confirm 890 */ 891 if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) { 892 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 893 status = nfserr_clid_inuse; 894 } else { 895 status = nfs_ok; 896 clp = unconf; 897 move_to_confirmed(unconf); 898 } 899 goto out; 900 } 901 /* CASE 4: 902 * conf record not found, or if conf, then conf->cl_confirm does not 903 * match input confirm. 904 * unconf record not found, or if unconf, then unconf->cl_confirm 905 * does not match input confirm. 906 */ 907 if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) && 908 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) { 909 status = nfserr_stale_clientid; 910 goto out; 911 } 912 /* check that we have hit one of the cases...*/ 913 status = nfserr_inval; 914 goto out; 915 out: 916 if (!status) 917 nfsd4_probe_callback(clp); 918 nfs4_unlock_state(); 919 return status; 920 } 921 922 /* 923 * Open owner state (share locks) 924 */ 925 926 /* hash tables for nfs4_stateowner */ 927 #define OWNER_HASH_BITS 8 928 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 929 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 930 931 #define ownerid_hashval(id) \ 932 ((id) & OWNER_HASH_MASK) 933 #define ownerstr_hashval(clientid, ownername) \ 934 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 935 936 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 937 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 938 939 /* hash table for nfs4_file */ 940 #define FILE_HASH_BITS 8 941 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 942 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 943 /* hash table for (open)nfs4_stateid */ 944 #define STATEID_HASH_BITS 10 945 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 946 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 947 948 #define file_hashval(x) \ 949 hash_ptr(x, FILE_HASH_BITS) 950 #define stateid_hashval(owner_id, file_id) \ 951 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 952 953 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 954 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 955 956 /* OPEN Share state helper functions */ 957 static inline struct nfs4_file * 958 alloc_init_file(struct inode *ino) 959 { 960 struct nfs4_file *fp; 961 unsigned int hashval = file_hashval(ino); 962 963 if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) { 964 INIT_LIST_HEAD(&fp->fi_hash); 965 INIT_LIST_HEAD(&fp->fi_perfile); 966 INIT_LIST_HEAD(&fp->fi_del_perfile); 967 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 968 fp->fi_inode = igrab(ino); 969 fp->fi_id = current_fileid++; 970 alloc_file++; 971 return fp; 972 } 973 return NULL; 974 } 975 976 static void 977 release_all_files(void) 978 { 979 int i; 980 struct nfs4_file *fp; 981 982 for (i=0;i<FILE_HASH_SIZE;i++) { 983 while (!list_empty(&file_hashtbl[i])) { 984 fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash); 985 /* this should never be more than once... */ 986 if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) { 987 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp); 988 } 989 release_file(fp); 990 } 991 } 992 } 993 994 kmem_cache_t *stateowner_slab = NULL; 995 996 static int 997 nfsd4_init_slabs(void) 998 { 999 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 1000 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL); 1001 if (stateowner_slab == NULL) { 1002 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 1003 return -ENOMEM; 1004 } 1005 return 0; 1006 } 1007 1008 static void 1009 nfsd4_free_slabs(void) 1010 { 1011 int status = 0; 1012 1013 if (stateowner_slab) 1014 status = kmem_cache_destroy(stateowner_slab); 1015 stateowner_slab = NULL; 1016 BUG_ON(status); 1017 } 1018 1019 void 1020 nfs4_free_stateowner(struct kref *kref) 1021 { 1022 struct nfs4_stateowner *sop = 1023 container_of(kref, struct nfs4_stateowner, so_ref); 1024 kfree(sop->so_owner.data); 1025 kmem_cache_free(stateowner_slab, sop); 1026 } 1027 1028 static inline struct nfs4_stateowner * 1029 alloc_stateowner(struct xdr_netobj *owner) 1030 { 1031 struct nfs4_stateowner *sop; 1032 1033 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 1034 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 1035 memcpy(sop->so_owner.data, owner->data, owner->len); 1036 sop->so_owner.len = owner->len; 1037 kref_init(&sop->so_ref); 1038 return sop; 1039 } 1040 kmem_cache_free(stateowner_slab, sop); 1041 } 1042 return NULL; 1043 } 1044 1045 static struct nfs4_stateowner * 1046 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 1047 struct nfs4_stateowner *sop; 1048 struct nfs4_replay *rp; 1049 unsigned int idhashval; 1050 1051 if (!(sop = alloc_stateowner(&open->op_owner))) 1052 return NULL; 1053 idhashval = ownerid_hashval(current_ownerid); 1054 INIT_LIST_HEAD(&sop->so_idhash); 1055 INIT_LIST_HEAD(&sop->so_strhash); 1056 INIT_LIST_HEAD(&sop->so_perclient); 1057 INIT_LIST_HEAD(&sop->so_perfilestate); 1058 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */ 1059 INIT_LIST_HEAD(&sop->so_close_lru); 1060 sop->so_time = 0; 1061 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 1062 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 1063 list_add(&sop->so_perclient, &clp->cl_perclient); 1064 add_perclient++; 1065 sop->so_is_open_owner = 1; 1066 sop->so_id = current_ownerid++; 1067 sop->so_client = clp; 1068 sop->so_seqid = open->op_seqid; 1069 sop->so_confirmed = 0; 1070 rp = &sop->so_replay; 1071 rp->rp_status = NFSERR_SERVERFAULT; 1072 rp->rp_buflen = 0; 1073 rp->rp_buf = rp->rp_ibuf; 1074 return sop; 1075 } 1076 1077 static void 1078 release_stateid_lockowners(struct nfs4_stateid *open_stp) 1079 { 1080 struct nfs4_stateowner *lock_sop; 1081 1082 while (!list_empty(&open_stp->st_perlockowner)) { 1083 lock_sop = list_entry(open_stp->st_perlockowner.next, 1084 struct nfs4_stateowner, so_perlockowner); 1085 /* list_del(&open_stp->st_perlockowner); */ 1086 BUG_ON(lock_sop->so_is_open_owner); 1087 release_stateowner(lock_sop); 1088 } 1089 } 1090 1091 static void 1092 unhash_stateowner(struct nfs4_stateowner *sop) 1093 { 1094 struct nfs4_stateid *stp; 1095 1096 list_del(&sop->so_idhash); 1097 list_del(&sop->so_strhash); 1098 if (sop->so_is_open_owner) { 1099 list_del(&sop->so_perclient); 1100 del_perclient++; 1101 } 1102 list_del(&sop->so_perlockowner); 1103 while (!list_empty(&sop->so_perfilestate)) { 1104 stp = list_entry(sop->so_perfilestate.next, 1105 struct nfs4_stateid, st_perfilestate); 1106 if (sop->so_is_open_owner) 1107 release_stateid(stp, OPEN_STATE); 1108 else 1109 release_stateid(stp, LOCK_STATE); 1110 } 1111 } 1112 1113 static void 1114 release_stateowner(struct nfs4_stateowner *sop) 1115 { 1116 unhash_stateowner(sop); 1117 list_del(&sop->so_close_lru); 1118 nfs4_put_stateowner(sop); 1119 } 1120 1121 static inline void 1122 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 1123 struct nfs4_stateowner *sop = open->op_stateowner; 1124 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 1125 1126 INIT_LIST_HEAD(&stp->st_hash); 1127 INIT_LIST_HEAD(&stp->st_perfilestate); 1128 INIT_LIST_HEAD(&stp->st_perlockowner); 1129 INIT_LIST_HEAD(&stp->st_perfile); 1130 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 1131 list_add(&stp->st_perfilestate, &sop->so_perfilestate); 1132 list_add_perfile++; 1133 list_add(&stp->st_perfile, &fp->fi_perfile); 1134 stp->st_stateowner = sop; 1135 stp->st_file = fp; 1136 stp->st_stateid.si_boot = boot_time; 1137 stp->st_stateid.si_stateownerid = sop->so_id; 1138 stp->st_stateid.si_fileid = fp->fi_id; 1139 stp->st_stateid.si_generation = 0; 1140 stp->st_access_bmap = 0; 1141 stp->st_deny_bmap = 0; 1142 __set_bit(open->op_share_access, &stp->st_access_bmap); 1143 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1144 } 1145 1146 static void 1147 release_stateid(struct nfs4_stateid *stp, int flags) 1148 { 1149 struct file *filp = stp->st_vfs_file; 1150 1151 list_del(&stp->st_hash); 1152 list_del_perfile++; 1153 list_del(&stp->st_perfile); 1154 list_del(&stp->st_perfilestate); 1155 if (flags & OPEN_STATE) { 1156 release_stateid_lockowners(stp); 1157 stp->st_vfs_file = NULL; 1158 nfsd_close(filp); 1159 vfsclose++; 1160 } else if (flags & LOCK_STATE) 1161 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner); 1162 kfree(stp); 1163 stp = NULL; 1164 } 1165 1166 static void 1167 release_file(struct nfs4_file *fp) 1168 { 1169 free_file++; 1170 list_del(&fp->fi_hash); 1171 iput(fp->fi_inode); 1172 kfree(fp); 1173 } 1174 1175 void 1176 move_to_close_lru(struct nfs4_stateowner *sop) 1177 { 1178 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 1179 1180 unhash_stateowner(sop); 1181 list_add_tail(&sop->so_close_lru, &close_lru); 1182 sop->so_time = get_seconds(); 1183 } 1184 1185 void 1186 release_state_owner(struct nfs4_stateid *stp, int flag) 1187 { 1188 struct nfs4_stateowner *sop = stp->st_stateowner; 1189 struct nfs4_file *fp = stp->st_file; 1190 1191 dprintk("NFSD: release_state_owner\n"); 1192 release_stateid(stp, flag); 1193 1194 /* place unused nfs4_stateowners on so_close_lru list to be 1195 * released by the laundromat service after the lease period 1196 * to enable us to handle CLOSE replay 1197 */ 1198 if (sop->so_confirmed && list_empty(&sop->so_perfilestate)) 1199 move_to_close_lru(sop); 1200 /* unused nfs4_file's are releseed. XXX slab cache? */ 1201 if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) { 1202 release_file(fp); 1203 } 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 return fp; 1235 } 1236 return NULL; 1237 } 1238 1239 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0) 1240 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0) 1241 1242 void 1243 set_access(unsigned int *access, unsigned long bmap) { 1244 int i; 1245 1246 *access = 0; 1247 for (i = 1; i < 4; i++) { 1248 if (test_bit(i, &bmap)) 1249 *access |= i; 1250 } 1251 } 1252 1253 void 1254 set_deny(unsigned int *deny, unsigned long bmap) { 1255 int i; 1256 1257 *deny = 0; 1258 for (i = 0; i < 4; i++) { 1259 if (test_bit(i, &bmap)) 1260 *deny |= i ; 1261 } 1262 } 1263 1264 static int 1265 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 1266 unsigned int access, deny; 1267 1268 set_access(&access, stp->st_access_bmap); 1269 set_deny(&deny, stp->st_deny_bmap); 1270 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 1271 return 0; 1272 return 1; 1273 } 1274 1275 /* 1276 * Called to check deny when READ with all zero stateid or 1277 * WRITE with all zero or all one stateid 1278 */ 1279 int 1280 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 1281 { 1282 struct inode *ino = current_fh->fh_dentry->d_inode; 1283 struct nfs4_file *fp; 1284 struct nfs4_stateid *stp; 1285 1286 dprintk("NFSD: nfs4_share_conflict\n"); 1287 1288 fp = find_file(ino); 1289 if (fp) { 1290 /* Search for conflicting share reservations */ 1291 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) { 1292 if (test_bit(deny_type, &stp->st_deny_bmap) || 1293 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 1294 return nfserr_share_denied; 1295 } 1296 } 1297 return nfs_ok; 1298 } 1299 1300 static inline void 1301 nfs4_file_downgrade(struct file *filp, unsigned int share_access) 1302 { 1303 if (share_access & NFS4_SHARE_ACCESS_WRITE) { 1304 put_write_access(filp->f_dentry->d_inode); 1305 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; 1306 } 1307 } 1308 1309 /* 1310 * Recall a delegation 1311 */ 1312 static int 1313 do_recall(void *__dp) 1314 { 1315 struct nfs4_delegation *dp = __dp; 1316 1317 daemonize("nfsv4-recall"); 1318 1319 nfsd4_cb_recall(dp); 1320 return 0; 1321 } 1322 1323 /* 1324 * Spawn a thread to perform a recall on the delegation represented 1325 * by the lease (file_lock) 1326 * 1327 * Called from break_lease() with lock_kernel() held. 1328 * Note: we assume break_lease will only call this *once* for any given 1329 * lease. 1330 */ 1331 static 1332 void nfsd_break_deleg_cb(struct file_lock *fl) 1333 { 1334 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner; 1335 struct task_struct *t; 1336 1337 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 1338 if (!dp) 1339 return; 1340 1341 /* We're assuming the state code never drops its reference 1342 * without first removing the lease. Since we're in this lease 1343 * callback (and since the lease code is serialized by the kernel 1344 * lock) we know the server hasn't removed the lease yet, we know 1345 * it's safe to take a reference: */ 1346 atomic_inc(&dp->dl_count); 1347 1348 spin_lock(&recall_lock); 1349 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 1350 spin_unlock(&recall_lock); 1351 1352 /* only place dl_time is set. protected by lock_kernel*/ 1353 dp->dl_time = get_seconds(); 1354 1355 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */ 1356 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ; 1357 1358 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall"); 1359 if (IS_ERR(t)) { 1360 struct nfs4_client *clp = dp->dl_client; 1361 1362 printk(KERN_INFO "NFSD: Callback thread failed for " 1363 "for client (clientid %08x/%08x)\n", 1364 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 1365 nfs4_put_delegation(dp); 1366 } 1367 } 1368 1369 /* 1370 * The file_lock is being reapd. 1371 * 1372 * Called by locks_free_lock() with lock_kernel() held. 1373 */ 1374 static 1375 void nfsd_release_deleg_cb(struct file_lock *fl) 1376 { 1377 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 1378 1379 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count)); 1380 1381 if (!(fl->fl_flags & FL_LEASE) || !dp) 1382 return; 1383 dp->dl_flock = NULL; 1384 } 1385 1386 /* 1387 * Set the delegation file_lock back pointer. 1388 * 1389 * Called from __setlease() with lock_kernel() held. 1390 */ 1391 static 1392 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl) 1393 { 1394 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner; 1395 1396 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp); 1397 if (!dp) 1398 return; 1399 dp->dl_flock = new; 1400 } 1401 1402 /* 1403 * Called from __setlease() with lock_kernel() held 1404 */ 1405 static 1406 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) 1407 { 1408 struct nfs4_delegation *onlistd = 1409 (struct nfs4_delegation *)onlist->fl_owner; 1410 struct nfs4_delegation *tryd = 1411 (struct nfs4_delegation *)try->fl_owner; 1412 1413 if (onlist->fl_lmops != try->fl_lmops) 1414 return 0; 1415 1416 return onlistd->dl_client == tryd->dl_client; 1417 } 1418 1419 1420 static 1421 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) 1422 { 1423 if (arg & F_UNLCK) 1424 return lease_modify(onlist, arg); 1425 else 1426 return -EAGAIN; 1427 } 1428 1429 struct lock_manager_operations nfsd_lease_mng_ops = { 1430 .fl_break = nfsd_break_deleg_cb, 1431 .fl_release_private = nfsd_release_deleg_cb, 1432 .fl_copy_lock = nfsd_copy_lock_deleg_cb, 1433 .fl_mylease = nfsd_same_client_deleg_cb, 1434 .fl_change = nfsd_change_deleg_cb, 1435 }; 1436 1437 1438 /* 1439 * nfsd4_process_open1() 1440 * lookup stateowner. 1441 * found: 1442 * check confirmed 1443 * confirmed: 1444 * check seqid 1445 * not confirmed: 1446 * delete owner 1447 * create new owner 1448 * notfound: 1449 * verify clientid 1450 * create new owner 1451 * 1452 * called with nfs4_lock_state() held. 1453 */ 1454 int 1455 nfsd4_process_open1(struct nfsd4_open *open) 1456 { 1457 int status; 1458 clientid_t *clientid = &open->op_clientid; 1459 struct nfs4_client *clp = NULL; 1460 unsigned int strhashval; 1461 struct nfs4_stateowner *sop = NULL; 1462 1463 status = nfserr_inval; 1464 if (!check_name(open->op_owner)) 1465 goto out; 1466 1467 if (STALE_CLIENTID(&open->op_clientid)) 1468 return nfserr_stale_clientid; 1469 1470 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); 1471 sop = find_openstateowner_str(strhashval, open); 1472 if (sop) { 1473 open->op_stateowner = sop; 1474 /* check for replay */ 1475 if (open->op_seqid == sop->so_seqid){ 1476 if (sop->so_replay.rp_buflen) 1477 return NFSERR_REPLAY_ME; 1478 else { 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:" 1486 " replay with no replay cache\n"); 1487 goto renew; 1488 } 1489 } else if (sop->so_confirmed) { 1490 if (open->op_seqid == sop->so_seqid + 1) 1491 goto renew; 1492 status = nfserr_bad_seqid; 1493 goto out; 1494 } else { 1495 /* If we get here, we received an OPEN for an 1496 * unconfirmed nfs4_stateowner. Since the seqid's are 1497 * different, purge the existing nfs4_stateowner, and 1498 * instantiate a new one. 1499 */ 1500 clp = sop->so_client; 1501 release_stateowner(sop); 1502 } 1503 } else { 1504 /* nfs4_stateowner not found. 1505 * Verify clientid and instantiate new nfs4_stateowner. 1506 * If verify fails this is presumably the result of the 1507 * client's lease expiring. 1508 */ 1509 status = nfserr_expired; 1510 clp = find_confirmed_client(clientid); 1511 if (clp == NULL) 1512 goto out; 1513 } 1514 status = nfserr_resource; 1515 sop = alloc_init_open_stateowner(strhashval, clp, open); 1516 if (sop == NULL) 1517 goto out; 1518 open->op_stateowner = sop; 1519 renew: 1520 status = nfs_ok; 1521 renew_client(sop->so_client); 1522 out: 1523 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 1524 status = nfserr_reclaim_bad; 1525 return status; 1526 } 1527 1528 static int 1529 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 1530 { 1531 struct nfs4_stateid *local; 1532 int status = nfserr_share_denied; 1533 struct nfs4_stateowner *sop = open->op_stateowner; 1534 1535 list_for_each_entry(local, &fp->fi_perfile, st_perfile) { 1536 /* ignore lock owners */ 1537 if (local->st_stateowner->so_is_open_owner == 0) 1538 continue; 1539 /* remember if we have seen this open owner */ 1540 if (local->st_stateowner == sop) 1541 *stpp = local; 1542 /* check for conflicting share reservations */ 1543 if (!test_share(local, open)) 1544 goto out; 1545 } 1546 status = 0; 1547 out: 1548 return status; 1549 } 1550 1551 static int 1552 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, 1553 struct svc_fh *cur_fh, int flags) 1554 { 1555 struct nfs4_stateid *stp; 1556 int status; 1557 1558 stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL); 1559 if (stp == NULL) 1560 return nfserr_resource; 1561 1562 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, &stp->st_vfs_file); 1563 if (status) { 1564 if (status == nfserr_dropit) 1565 status = nfserr_jukebox; 1566 kfree(stp); 1567 return status; 1568 } 1569 vfsopen++; 1570 *stpp = stp; 1571 return 0; 1572 } 1573 1574 static inline int 1575 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 1576 struct nfsd4_open *open) 1577 { 1578 struct iattr iattr = { 1579 .ia_valid = ATTR_SIZE, 1580 .ia_size = 0, 1581 }; 1582 if (!open->op_truncate) 1583 return 0; 1584 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 1585 return -EINVAL; 1586 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 1587 } 1588 1589 static int 1590 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) 1591 { 1592 struct file *filp = stp->st_vfs_file; 1593 struct inode *inode = filp->f_dentry->d_inode; 1594 unsigned int share_access; 1595 int status; 1596 1597 set_access(&share_access, stp->st_access_bmap); 1598 share_access = ~share_access; 1599 share_access &= open->op_share_access; 1600 1601 if (!(share_access & NFS4_SHARE_ACCESS_WRITE)) 1602 return nfsd4_truncate(rqstp, cur_fh, open); 1603 1604 status = get_write_access(inode); 1605 if (status) 1606 return nfserrno(status); 1607 status = nfsd4_truncate(rqstp, cur_fh, open); 1608 if (status) { 1609 put_write_access(inode); 1610 return status; 1611 } 1612 /* remember the open */ 1613 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ; 1614 set_bit(open->op_share_access, &stp->st_access_bmap); 1615 set_bit(open->op_share_deny, &stp->st_deny_bmap); 1616 1617 return nfs_ok; 1618 } 1619 1620 1621 /* decrement seqid on successful reclaim, it will be bumped in encode_open */ 1622 static void 1623 nfs4_set_claim_prev(struct nfsd4_open *open, int *status) 1624 { 1625 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) { 1626 if (*status) 1627 *status = nfserr_reclaim_bad; 1628 else { 1629 open->op_stateowner->so_confirmed = 1; 1630 open->op_stateowner->so_seqid--; 1631 } 1632 } 1633 } 1634 1635 /* 1636 * Attempt to hand out a delegation. 1637 */ 1638 static void 1639 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp) 1640 { 1641 struct nfs4_delegation *dp; 1642 struct nfs4_stateowner *sop = stp->st_stateowner; 1643 struct nfs4_callback *cb = &sop->so_client->cl_callback; 1644 struct file_lock fl, *flp = &fl; 1645 int status, flag = 0; 1646 1647 flag = NFS4_OPEN_DELEGATE_NONE; 1648 if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL 1649 || !atomic_read(&cb->cb_set) || !sop->so_confirmed) 1650 goto out; 1651 1652 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1653 flag = NFS4_OPEN_DELEGATE_WRITE; 1654 else 1655 flag = NFS4_OPEN_DELEGATE_READ; 1656 1657 dp = alloc_init_deleg(sop->so_client, stp, fh, flag); 1658 if (dp == NULL) { 1659 flag = NFS4_OPEN_DELEGATE_NONE; 1660 goto out; 1661 } 1662 locks_init_lock(&fl); 1663 fl.fl_lmops = &nfsd_lease_mng_ops; 1664 fl.fl_flags = FL_LEASE; 1665 fl.fl_end = OFFSET_MAX; 1666 fl.fl_owner = (fl_owner_t)dp; 1667 fl.fl_file = stp->st_vfs_file; 1668 fl.fl_pid = current->tgid; 1669 1670 /* setlease checks to see if delegation should be handed out. 1671 * the lock_manager callbacks fl_mylease and fl_change are used 1672 */ 1673 if ((status = setlease(stp->st_vfs_file, 1674 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) { 1675 dprintk("NFSD: setlease failed [%d], no delegation\n", status); 1676 list_del(&dp->dl_del_perfile); 1677 list_del(&dp->dl_del_perclnt); 1678 nfs4_put_delegation(dp); 1679 free_delegation++; 1680 flag = NFS4_OPEN_DELEGATE_NONE; 1681 goto out; 1682 } 1683 1684 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); 1685 1686 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n", 1687 dp->dl_stateid.si_boot, 1688 dp->dl_stateid.si_stateownerid, 1689 dp->dl_stateid.si_fileid, 1690 dp->dl_stateid.si_generation); 1691 out: 1692 open->op_delegate_type = flag; 1693 } 1694 1695 /* 1696 * called with nfs4_lock_state() held. 1697 */ 1698 int 1699 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 1700 { 1701 struct nfs4_file *fp = NULL; 1702 struct inode *ino = current_fh->fh_dentry->d_inode; 1703 struct nfs4_stateid *stp = NULL; 1704 int status; 1705 1706 status = nfserr_inval; 1707 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny)) 1708 goto out; 1709 /* 1710 * Lookup file; if found, lookup stateid and check open request, 1711 * and check for delegations in the process of being recalled. 1712 * If not found, create the nfs4_file struct 1713 */ 1714 fp = find_file(ino); 1715 if (fp) { 1716 if ((status = nfs4_check_open(fp, open, &stp))) 1717 goto out; 1718 } else { 1719 status = nfserr_resource; 1720 fp = alloc_init_file(ino); 1721 if (fp == NULL) 1722 goto out; 1723 } 1724 1725 /* 1726 * OPEN the file, or upgrade an existing OPEN. 1727 * If truncate fails, the OPEN fails. 1728 */ 1729 if (stp) { 1730 /* Stateid was found, this is an OPEN upgrade */ 1731 status = nfs4_upgrade_open(rqstp, current_fh, stp, open); 1732 if (status) 1733 goto out; 1734 } else { 1735 /* Stateid was not found, this is a new OPEN */ 1736 int flags = 0; 1737 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 1738 flags = MAY_WRITE; 1739 else 1740 flags = MAY_READ; 1741 if ((status = nfs4_new_open(rqstp, &stp, current_fh, flags))) 1742 goto out; 1743 init_stateid(stp, fp, open); 1744 status = nfsd4_truncate(rqstp, current_fh, open); 1745 if (status) { 1746 release_stateid(stp, OPEN_STATE); 1747 goto out; 1748 } 1749 } 1750 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 1751 1752 /* 1753 * Attempt to hand out a delegation. No error return, because the 1754 * OPEN succeeds even if we fail. 1755 */ 1756 nfs4_open_delegation(current_fh, open, stp); 1757 1758 status = nfs_ok; 1759 1760 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n", 1761 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid, 1762 stp->st_stateid.si_fileid, stp->st_stateid.si_generation); 1763 out: 1764 /* take the opportunity to clean up unused state */ 1765 if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) 1766 release_file(fp); 1767 1768 /* CLAIM_PREVIOUS has different error returns */ 1769 nfs4_set_claim_prev(open, &status); 1770 /* 1771 * To finish the open response, we just need to set the rflags. 1772 */ 1773 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 1774 if (!open->op_stateowner->so_confirmed) 1775 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 1776 1777 return status; 1778 } 1779 1780 static struct work_struct laundromat_work; 1781 static void laundromat_main(void *); 1782 static DECLARE_WORK(laundromat_work, laundromat_main, NULL); 1783 1784 int 1785 nfsd4_renew(clientid_t *clid) 1786 { 1787 struct nfs4_client *clp; 1788 int status; 1789 1790 nfs4_lock_state(); 1791 dprintk("process_renew(%08x/%08x): starting\n", 1792 clid->cl_boot, clid->cl_id); 1793 status = nfserr_stale_clientid; 1794 if (STALE_CLIENTID(clid)) 1795 goto out; 1796 clp = find_confirmed_client(clid); 1797 status = nfserr_expired; 1798 if (clp == NULL) { 1799 /* We assume the client took too long to RENEW. */ 1800 dprintk("nfsd4_renew: clientid not found!\n"); 1801 goto out; 1802 } 1803 renew_client(clp); 1804 status = nfserr_cb_path_down; 1805 if (!list_empty(&clp->cl_del_perclnt) 1806 && !atomic_read(&clp->cl_callback.cb_set)) 1807 goto out; 1808 status = nfs_ok; 1809 out: 1810 nfs4_unlock_state(); 1811 return status; 1812 } 1813 1814 time_t 1815 nfs4_laundromat(void) 1816 { 1817 struct nfs4_client *clp; 1818 struct nfs4_stateowner *sop; 1819 struct nfs4_delegation *dp; 1820 struct list_head *pos, *next, reaplist; 1821 time_t cutoff = get_seconds() - NFSD_LEASE_TIME; 1822 time_t t, clientid_val = NFSD_LEASE_TIME; 1823 time_t u, test_val = NFSD_LEASE_TIME; 1824 1825 nfs4_lock_state(); 1826 1827 dprintk("NFSD: laundromat service - starting\n"); 1828 list_for_each_safe(pos, next, &client_lru) { 1829 clp = list_entry(pos, struct nfs4_client, cl_lru); 1830 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 1831 t = clp->cl_time - cutoff; 1832 if (clientid_val > t) 1833 clientid_val = t; 1834 break; 1835 } 1836 dprintk("NFSD: purging unused client (clientid %08x)\n", 1837 clp->cl_clientid.cl_id); 1838 expire_client(clp); 1839 } 1840 INIT_LIST_HEAD(&reaplist); 1841 spin_lock(&recall_lock); 1842 list_for_each_safe(pos, next, &del_recall_lru) { 1843 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1844 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 1845 u = dp->dl_time - cutoff; 1846 if (test_val > u) 1847 test_val = u; 1848 break; 1849 } 1850 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 1851 dp, dp->dl_flock); 1852 list_move(&dp->dl_recall_lru, &reaplist); 1853 } 1854 spin_unlock(&recall_lock); 1855 list_for_each_safe(pos, next, &reaplist) { 1856 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 1857 list_del_init(&dp->dl_recall_lru); 1858 unhash_delegation(dp); 1859 } 1860 test_val = NFSD_LEASE_TIME; 1861 list_for_each_safe(pos, next, &close_lru) { 1862 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 1863 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 1864 u = sop->so_time - cutoff; 1865 if (test_val > u) 1866 test_val = u; 1867 break; 1868 } 1869 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 1870 sop->so_id); 1871 list_del(&sop->so_close_lru); 1872 nfs4_put_stateowner(sop); 1873 } 1874 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 1875 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 1876 nfs4_unlock_state(); 1877 return clientid_val; 1878 } 1879 1880 void 1881 laundromat_main(void *not_used) 1882 { 1883 time_t t; 1884 1885 t = nfs4_laundromat(); 1886 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 1887 schedule_delayed_work(&laundromat_work, t*HZ); 1888 } 1889 1890 /* search ownerid_hashtbl[] and close_lru for stateid owner 1891 * (stateid->si_stateownerid) 1892 */ 1893 struct nfs4_stateowner * 1894 find_openstateowner_id(u32 st_id, int flags) { 1895 struct nfs4_stateowner *local = NULL; 1896 1897 dprintk("NFSD: find_openstateowner_id %d\n", st_id); 1898 if (flags & CLOSE_STATE) { 1899 list_for_each_entry(local, &close_lru, so_close_lru) { 1900 if (local->so_id == st_id) 1901 return local; 1902 } 1903 } 1904 return NULL; 1905 } 1906 1907 static inline int 1908 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 1909 { 1910 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode; 1911 } 1912 1913 static int 1914 STALE_STATEID(stateid_t *stateid) 1915 { 1916 if (stateid->si_boot == boot_time) 1917 return 0; 1918 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n", 1919 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 1920 stateid->si_generation); 1921 return 1; 1922 } 1923 1924 static inline int 1925 access_permit_read(unsigned long access_bmap) 1926 { 1927 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 1928 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 1929 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 1930 } 1931 1932 static inline int 1933 access_permit_write(unsigned long access_bmap) 1934 { 1935 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 1936 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 1937 } 1938 1939 static 1940 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 1941 { 1942 int status = nfserr_openmode; 1943 1944 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 1945 goto out; 1946 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 1947 goto out; 1948 status = nfs_ok; 1949 out: 1950 return status; 1951 } 1952 1953 static inline int 1954 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 1955 { 1956 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 1957 return nfserr_openmode; 1958 else 1959 return nfs_ok; 1960 } 1961 1962 static inline int 1963 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 1964 { 1965 /* Trying to call delegreturn with a special stateid? Yuch: */ 1966 if (!(flags & (RD_STATE | WR_STATE))) 1967 return nfserr_bad_stateid; 1968 else if (ONE_STATEID(stateid) && (flags & RD_STATE)) 1969 return nfs_ok; 1970 else if (nfs4_in_grace()) { 1971 /* Answer in remaining cases depends on existance of 1972 * conflicting state; so we must wait out the grace period. */ 1973 return nfserr_grace; 1974 } else if (flags & WR_STATE) 1975 return nfs4_share_conflict(current_fh, 1976 NFS4_SHARE_DENY_WRITE); 1977 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 1978 return nfs4_share_conflict(current_fh, 1979 NFS4_SHARE_DENY_READ); 1980 } 1981 1982 /* 1983 * Allow READ/WRITE during grace period on recovered state only for files 1984 * that are not able to provide mandatory locking. 1985 */ 1986 static inline int 1987 io_during_grace_disallowed(struct inode *inode, int flags) 1988 { 1989 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE)) 1990 && MANDATORY_LOCK(inode); 1991 } 1992 1993 /* 1994 * Checks for stateid operations 1995 */ 1996 int 1997 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp) 1998 { 1999 struct nfs4_stateid *stp = NULL; 2000 struct nfs4_delegation *dp = NULL; 2001 stateid_t *stidp; 2002 struct inode *ino = current_fh->fh_dentry->d_inode; 2003 int status; 2004 2005 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n", 2006 stateid->si_boot, stateid->si_stateownerid, 2007 stateid->si_fileid, stateid->si_generation); 2008 if (filpp) 2009 *filpp = NULL; 2010 2011 if (io_during_grace_disallowed(ino, flags)) 2012 return nfserr_grace; 2013 2014 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2015 return check_special_stateids(current_fh, stateid, flags); 2016 2017 /* STALE STATEID */ 2018 status = nfserr_stale_stateid; 2019 if (STALE_STATEID(stateid)) 2020 goto out; 2021 2022 /* BAD STATEID */ 2023 status = nfserr_bad_stateid; 2024 if (!stateid->si_fileid) { /* delegation stateid */ 2025 if(!(dp = find_delegation_stateid(ino, stateid))) { 2026 dprintk("NFSD: delegation stateid not found\n"); 2027 if (nfs4_in_grace()) 2028 status = nfserr_grace; 2029 goto out; 2030 } 2031 stidp = &dp->dl_stateid; 2032 } else { /* open or lock stateid */ 2033 if (!(stp = find_stateid(stateid, flags))) { 2034 dprintk("NFSD: open or lock stateid not found\n"); 2035 if (nfs4_in_grace()) 2036 status = nfserr_grace; 2037 goto out; 2038 } 2039 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) 2040 goto out; 2041 if (!stp->st_stateowner->so_confirmed) 2042 goto out; 2043 stidp = &stp->st_stateid; 2044 } 2045 if (stateid->si_generation > stidp->si_generation) 2046 goto out; 2047 2048 /* OLD STATEID */ 2049 status = nfserr_old_stateid; 2050 if (stateid->si_generation < stidp->si_generation) 2051 goto out; 2052 if (stp) { 2053 if ((status = nfs4_check_openmode(stp,flags))) 2054 goto out; 2055 renew_client(stp->st_stateowner->so_client); 2056 if (filpp) 2057 *filpp = stp->st_vfs_file; 2058 } else if (dp) { 2059 if ((status = nfs4_check_delegmode(dp, flags))) 2060 goto out; 2061 renew_client(dp->dl_client); 2062 if (flags & DELEG_RET) 2063 unhash_delegation(dp); 2064 if (filpp) 2065 *filpp = dp->dl_vfs_file; 2066 } 2067 status = nfs_ok; 2068 out: 2069 return status; 2070 } 2071 2072 2073 /* 2074 * Checks for sequence id mutating operations. 2075 */ 2076 int 2077 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid) 2078 { 2079 int status; 2080 struct nfs4_stateid *stp; 2081 struct nfs4_stateowner *sop; 2082 2083 dprintk("NFSD: preprocess_seqid_op: seqid=%d " 2084 "stateid = (%08x/%08x/%08x/%08x)\n", seqid, 2085 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 2086 stateid->si_generation); 2087 2088 *stpp = NULL; 2089 *sopp = NULL; 2090 2091 status = nfserr_bad_stateid; 2092 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 2093 printk("NFSD: preprocess_seqid_op: magic stateid!\n"); 2094 goto out; 2095 } 2096 2097 status = nfserr_stale_stateid; 2098 if (STALE_STATEID(stateid)) 2099 goto out; 2100 /* 2101 * We return BAD_STATEID if filehandle doesn't match stateid, 2102 * the confirmed flag is incorrecly set, or the generation 2103 * number is incorrect. 2104 * If there is no entry in the openfile table for this id, 2105 * we can't always return BAD_STATEID; 2106 * this might be a retransmitted CLOSE which has arrived after 2107 * the openfile has been released. 2108 */ 2109 if (!(stp = find_stateid(stateid, flags))) 2110 goto no_nfs4_stateid; 2111 2112 status = nfserr_bad_stateid; 2113 2114 /* for new lock stateowners: 2115 * check that the lock->v.new.open_stateid 2116 * refers to an open stateowner 2117 * 2118 * check that the lockclid (nfs4_lock->v.new.clientid) is the same 2119 * as the open_stateid->st_stateowner->so_client->clientid 2120 */ 2121 if (lockclid) { 2122 struct nfs4_stateowner *sop = stp->st_stateowner; 2123 struct nfs4_client *clp = sop->so_client; 2124 2125 if (!sop->so_is_open_owner) 2126 goto out; 2127 if (!cmp_clid(&clp->cl_clientid, lockclid)) 2128 goto out; 2129 } 2130 2131 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) { 2132 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 2133 goto out; 2134 } 2135 2136 *stpp = stp; 2137 *sopp = sop = stp->st_stateowner; 2138 2139 /* 2140 * We now validate the seqid and stateid generation numbers. 2141 * For the moment, we ignore the possibility of 2142 * generation number wraparound. 2143 */ 2144 if (seqid != sop->so_seqid + 1) 2145 goto check_replay; 2146 2147 if (sop->so_confirmed) { 2148 if (flags & CONFIRM) { 2149 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n"); 2150 goto out; 2151 } 2152 } 2153 else { 2154 if (!(flags & CONFIRM)) { 2155 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n"); 2156 goto out; 2157 } 2158 } 2159 if (stateid->si_generation > stp->st_stateid.si_generation) { 2160 printk("NFSD: preprocess_seqid_op: future stateid?!\n"); 2161 goto out; 2162 } 2163 2164 status = nfserr_old_stateid; 2165 if (stateid->si_generation < stp->st_stateid.si_generation) { 2166 printk("NFSD: preprocess_seqid_op: old stateid!\n"); 2167 goto out; 2168 } 2169 /* XXX renew the client lease here */ 2170 status = nfs_ok; 2171 2172 out: 2173 return status; 2174 2175 no_nfs4_stateid: 2176 2177 /* 2178 * We determine whether this is a bad stateid or a replay, 2179 * starting by trying to look up the stateowner. 2180 * If stateowner is not found - stateid is bad. 2181 */ 2182 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) { 2183 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n"); 2184 status = nfserr_bad_stateid; 2185 goto out; 2186 } 2187 *sopp = sop; 2188 2189 check_replay: 2190 if (seqid == sop->so_seqid) { 2191 printk("NFSD: preprocess_seqid_op: retransmission?\n"); 2192 /* indicate replay to calling function */ 2193 status = NFSERR_REPLAY_ME; 2194 } else { 2195 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid); 2196 2197 *sopp = NULL; 2198 status = nfserr_bad_seqid; 2199 } 2200 goto out; 2201 } 2202 2203 int 2204 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc) 2205 { 2206 int status; 2207 struct nfs4_stateowner *sop; 2208 struct nfs4_stateid *stp; 2209 2210 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 2211 (int)current_fh->fh_dentry->d_name.len, 2212 current_fh->fh_dentry->d_name.name); 2213 2214 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) 2215 goto out; 2216 2217 nfs4_lock_state(); 2218 2219 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid, 2220 &oc->oc_req_stateid, 2221 CHECK_FH | CONFIRM | OPEN_STATE, 2222 &oc->oc_stateowner, &stp, NULL))) 2223 goto out; 2224 2225 sop = oc->oc_stateowner; 2226 sop->so_confirmed = 1; 2227 update_stateid(&stp->st_stateid); 2228 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 2229 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 2230 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid, 2231 stp->st_stateid.si_boot, 2232 stp->st_stateid.si_stateownerid, 2233 stp->st_stateid.si_fileid, 2234 stp->st_stateid.si_generation); 2235 out: 2236 if (oc->oc_stateowner) 2237 nfs4_get_stateowner(oc->oc_stateowner); 2238 nfs4_unlock_state(); 2239 return status; 2240 } 2241 2242 2243 /* 2244 * unset all bits in union bitmap (bmap) that 2245 * do not exist in share (from successful OPEN_DOWNGRADE) 2246 */ 2247 static void 2248 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 2249 { 2250 int i; 2251 for (i = 1; i < 4; i++) { 2252 if ((i & access) != i) 2253 __clear_bit(i, bmap); 2254 } 2255 } 2256 2257 static void 2258 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 2259 { 2260 int i; 2261 for (i = 0; i < 4; i++) { 2262 if ((i & deny) != i) 2263 __clear_bit(i, bmap); 2264 } 2265 } 2266 2267 int 2268 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od) 2269 { 2270 int status; 2271 struct nfs4_stateid *stp; 2272 unsigned int share_access; 2273 2274 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 2275 (int)current_fh->fh_dentry->d_name.len, 2276 current_fh->fh_dentry->d_name.name); 2277 2278 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny)) 2279 return nfserr_inval; 2280 2281 nfs4_lock_state(); 2282 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 2283 &od->od_stateid, 2284 CHECK_FH | OPEN_STATE, 2285 &od->od_stateowner, &stp, NULL))) 2286 goto out; 2287 2288 status = nfserr_inval; 2289 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 2290 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 2291 stp->st_access_bmap, od->od_share_access); 2292 goto out; 2293 } 2294 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 2295 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 2296 stp->st_deny_bmap, od->od_share_deny); 2297 goto out; 2298 } 2299 set_access(&share_access, stp->st_access_bmap); 2300 nfs4_file_downgrade(stp->st_vfs_file, 2301 share_access & ~od->od_share_access); 2302 2303 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 2304 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 2305 2306 update_stateid(&stp->st_stateid); 2307 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 2308 status = nfs_ok; 2309 out: 2310 if (od->od_stateowner) 2311 nfs4_get_stateowner(od->od_stateowner); 2312 nfs4_unlock_state(); 2313 return status; 2314 } 2315 2316 /* 2317 * nfs4_unlock_state() called after encode 2318 */ 2319 int 2320 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close) 2321 { 2322 int status; 2323 struct nfs4_stateid *stp; 2324 2325 dprintk("NFSD: nfsd4_close on file %.*s\n", 2326 (int)current_fh->fh_dentry->d_name.len, 2327 current_fh->fh_dentry->d_name.name); 2328 2329 nfs4_lock_state(); 2330 /* check close_lru for replay */ 2331 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 2332 &close->cl_stateid, 2333 CHECK_FH | OPEN_STATE | CLOSE_STATE, 2334 &close->cl_stateowner, &stp, NULL))) 2335 goto out; 2336 /* 2337 * Return success, but first update the stateid. 2338 */ 2339 status = nfs_ok; 2340 update_stateid(&stp->st_stateid); 2341 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 2342 2343 /* release_state_owner() calls nfsd_close() if needed */ 2344 release_state_owner(stp, OPEN_STATE); 2345 out: 2346 if (close->cl_stateowner) 2347 nfs4_get_stateowner(close->cl_stateowner); 2348 nfs4_unlock_state(); 2349 return status; 2350 } 2351 2352 int 2353 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr) 2354 { 2355 int status; 2356 2357 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) 2358 goto out; 2359 2360 nfs4_lock_state(); 2361 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL); 2362 nfs4_unlock_state(); 2363 out: 2364 return status; 2365 } 2366 2367 2368 /* 2369 * Lock owner state (byte-range locks) 2370 */ 2371 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 2372 #define LOCK_HASH_BITS 8 2373 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 2374 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 2375 2376 #define lockownerid_hashval(id) \ 2377 ((id) & LOCK_HASH_MASK) 2378 2379 static inline unsigned int 2380 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 2381 struct xdr_netobj *ownername) 2382 { 2383 return (file_hashval(inode) + cl_id 2384 + opaque_hashval(ownername->data, ownername->len)) 2385 & LOCK_HASH_MASK; 2386 } 2387 2388 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 2389 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 2390 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 2391 2392 struct nfs4_stateid * 2393 find_stateid(stateid_t *stid, int flags) 2394 { 2395 struct nfs4_stateid *local = NULL; 2396 u32 st_id = stid->si_stateownerid; 2397 u32 f_id = stid->si_fileid; 2398 unsigned int hashval; 2399 2400 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 2401 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) { 2402 hashval = stateid_hashval(st_id, f_id); 2403 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 2404 if ((local->st_stateid.si_stateownerid == st_id) && 2405 (local->st_stateid.si_fileid == f_id)) 2406 return local; 2407 } 2408 } 2409 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) { 2410 hashval = stateid_hashval(st_id, f_id); 2411 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 2412 if ((local->st_stateid.si_stateownerid == st_id) && 2413 (local->st_stateid.si_fileid == f_id)) 2414 return local; 2415 } 2416 } else 2417 printk("NFSD: find_stateid: ERROR: no state flag\n"); 2418 return NULL; 2419 } 2420 2421 static struct nfs4_delegation * 2422 find_delegation_stateid(struct inode *ino, stateid_t *stid) 2423 { 2424 struct nfs4_delegation *dp = NULL; 2425 struct nfs4_file *fp = NULL; 2426 u32 st_id; 2427 2428 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n", 2429 stid->si_boot, stid->si_stateownerid, 2430 stid->si_fileid, stid->si_generation); 2431 2432 st_id = stid->si_stateownerid; 2433 fp = find_file(ino); 2434 if (fp) { 2435 list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) { 2436 if(dp->dl_stateid.si_stateownerid == st_id) { 2437 dprintk("NFSD: find_delegation dp %p\n",dp); 2438 return dp; 2439 } 2440 } 2441 } 2442 return NULL; 2443 } 2444 2445 /* 2446 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 2447 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 2448 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 2449 * locking, this prevents us from being completely protocol-compliant. The 2450 * real solution to this problem is to start using unsigned file offsets in 2451 * the VFS, but this is a very deep change! 2452 */ 2453 static inline void 2454 nfs4_transform_lock_offset(struct file_lock *lock) 2455 { 2456 if (lock->fl_start < 0) 2457 lock->fl_start = OFFSET_MAX; 2458 if (lock->fl_end < 0) 2459 lock->fl_end = OFFSET_MAX; 2460 } 2461 2462 int 2463 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval) 2464 { 2465 struct nfs4_stateowner *local = NULL; 2466 int status = 0; 2467 2468 if (hashval >= LOCK_HASH_SIZE) 2469 goto out; 2470 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) { 2471 if (local == sop) { 2472 status = 1; 2473 goto out; 2474 } 2475 } 2476 out: 2477 return status; 2478 } 2479 2480 2481 static inline void 2482 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 2483 { 2484 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner; 2485 unsigned int hval = lockownerid_hashval(sop->so_id); 2486 2487 deny->ld_sop = NULL; 2488 if (nfs4_verify_lock_stateowner(sop, hval)) { 2489 kref_get(&sop->so_ref); 2490 deny->ld_sop = sop; 2491 deny->ld_clientid = sop->so_client->cl_clientid; 2492 } 2493 deny->ld_start = fl->fl_start; 2494 deny->ld_length = ~(u64)0; 2495 if (fl->fl_end != ~(u64)0) 2496 deny->ld_length = fl->fl_end - fl->fl_start + 1; 2497 deny->ld_type = NFS4_READ_LT; 2498 if (fl->fl_type != F_RDLCK) 2499 deny->ld_type = NFS4_WRITE_LT; 2500 } 2501 2502 static struct nfs4_stateowner * 2503 find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid) 2504 { 2505 struct nfs4_stateowner *local = NULL; 2506 int i; 2507 2508 for (i = 0; i < LOCK_HASH_SIZE; i++) { 2509 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) { 2510 if (!cmp_owner_str(local, owner, clid)) 2511 continue; 2512 return local; 2513 } 2514 } 2515 return NULL; 2516 } 2517 2518 static struct nfs4_stateowner * 2519 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 2520 struct xdr_netobj *owner) 2521 { 2522 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 2523 struct nfs4_stateowner *op; 2524 2525 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 2526 if (cmp_owner_str(op, owner, clid)) 2527 return op; 2528 } 2529 return NULL; 2530 } 2531 2532 /* 2533 * Alloc a lock owner structure. 2534 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 2535 * occured. 2536 * 2537 * strhashval = lock_ownerstr_hashval 2538 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode 2539 */ 2540 2541 static struct nfs4_stateowner * 2542 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 2543 struct nfs4_stateowner *sop; 2544 struct nfs4_replay *rp; 2545 unsigned int idhashval; 2546 2547 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 2548 return NULL; 2549 idhashval = lockownerid_hashval(current_ownerid); 2550 INIT_LIST_HEAD(&sop->so_idhash); 2551 INIT_LIST_HEAD(&sop->so_strhash); 2552 INIT_LIST_HEAD(&sop->so_perclient); 2553 INIT_LIST_HEAD(&sop->so_perfilestate); 2554 INIT_LIST_HEAD(&sop->so_perlockowner); 2555 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 2556 sop->so_time = 0; 2557 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 2558 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 2559 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner); 2560 sop->so_is_open_owner = 0; 2561 sop->so_id = current_ownerid++; 2562 sop->so_client = clp; 2563 sop->so_seqid = lock->lk_new_lock_seqid - 1; 2564 sop->so_confirmed = 1; 2565 rp = &sop->so_replay; 2566 rp->rp_status = NFSERR_SERVERFAULT; 2567 rp->rp_buflen = 0; 2568 rp->rp_buf = rp->rp_ibuf; 2569 return sop; 2570 } 2571 2572 struct nfs4_stateid * 2573 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 2574 { 2575 struct nfs4_stateid *stp; 2576 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 2577 2578 if ((stp = kmalloc(sizeof(struct nfs4_stateid), 2579 GFP_KERNEL)) == NULL) 2580 goto out; 2581 INIT_LIST_HEAD(&stp->st_hash); 2582 INIT_LIST_HEAD(&stp->st_perfile); 2583 INIT_LIST_HEAD(&stp->st_perfilestate); 2584 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */ 2585 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 2586 list_add(&stp->st_perfile, &fp->fi_perfile); 2587 list_add_perfile++; 2588 list_add(&stp->st_perfilestate, &sop->so_perfilestate); 2589 stp->st_stateowner = sop; 2590 stp->st_file = fp; 2591 stp->st_stateid.si_boot = boot_time; 2592 stp->st_stateid.si_stateownerid = sop->so_id; 2593 stp->st_stateid.si_fileid = fp->fi_id; 2594 stp->st_stateid.si_generation = 0; 2595 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */ 2596 stp->st_access_bmap = open_stp->st_access_bmap; 2597 stp->st_deny_bmap = open_stp->st_deny_bmap; 2598 2599 out: 2600 return stp; 2601 } 2602 2603 int 2604 check_lock_length(u64 offset, u64 length) 2605 { 2606 return ((length == 0) || ((length != ~(u64)0) && 2607 LOFF_OVERFLOW(offset, length))); 2608 } 2609 2610 /* 2611 * LOCK operation 2612 */ 2613 int 2614 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock) 2615 { 2616 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL; 2617 struct nfs4_stateid *lock_stp; 2618 struct file *filp; 2619 struct file_lock file_lock; 2620 struct file_lock *conflock; 2621 int status = 0; 2622 unsigned int strhashval; 2623 2624 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 2625 (long long) lock->lk_offset, 2626 (long long) lock->lk_length); 2627 2628 if (nfs4_in_grace() && !lock->lk_reclaim) 2629 return nfserr_grace; 2630 if (!nfs4_in_grace() && lock->lk_reclaim) 2631 return nfserr_no_grace; 2632 2633 if (check_lock_length(lock->lk_offset, lock->lk_length)) 2634 return nfserr_inval; 2635 2636 nfs4_lock_state(); 2637 2638 if (lock->lk_is_new) { 2639 /* 2640 * Client indicates that this is a new lockowner. 2641 * Use open owner and open stateid to create lock owner and lock 2642 * stateid. 2643 */ 2644 struct nfs4_stateid *open_stp = NULL; 2645 struct nfs4_file *fp; 2646 2647 status = nfserr_stale_clientid; 2648 if (STALE_CLIENTID(&lock->lk_new_clientid)) { 2649 printk("NFSD: nfsd4_lock: clientid is stale!\n"); 2650 goto out; 2651 } 2652 2653 /* is the new lock seqid presented by the client zero? */ 2654 status = nfserr_bad_seqid; 2655 if (lock->v.new.lock_seqid != 0) 2656 goto out; 2657 2658 /* validate and update open stateid and open seqid */ 2659 status = nfs4_preprocess_seqid_op(current_fh, 2660 lock->lk_new_open_seqid, 2661 &lock->lk_new_open_stateid, 2662 CHECK_FH | OPEN_STATE, 2663 &open_sop, &open_stp, 2664 &lock->v.new.clientid); 2665 if (status) { 2666 if (lock->lk_reclaim) 2667 status = nfserr_reclaim_bad; 2668 goto out; 2669 } 2670 /* create lockowner and lock stateid */ 2671 fp = open_stp->st_file; 2672 strhashval = lock_ownerstr_hashval(fp->fi_inode, 2673 open_sop->so_client->cl_clientid.cl_id, 2674 &lock->v.new.owner); 2675 /* 2676 * If we already have this lock owner, the client is in 2677 * error (or our bookeeping is wrong!) 2678 * for asking for a 'new lock'. 2679 */ 2680 status = nfserr_bad_stateid; 2681 lock_sop = find_lockstateowner(&lock->v.new.owner, 2682 &lock->v.new.clientid); 2683 if (lock_sop) 2684 goto out; 2685 status = nfserr_resource; 2686 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock))) 2687 goto out; 2688 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner, 2689 fp, open_stp)) == NULL) { 2690 release_stateowner(lock->lk_stateowner); 2691 lock->lk_stateowner = NULL; 2692 goto out; 2693 } 2694 /* bump the open seqid used to create the lock */ 2695 open_sop->so_seqid++; 2696 } else { 2697 /* lock (lock owner + lock stateid) already exists */ 2698 status = nfs4_preprocess_seqid_op(current_fh, 2699 lock->lk_old_lock_seqid, 2700 &lock->lk_old_lock_stateid, 2701 CHECK_FH | LOCK_STATE, 2702 &lock->lk_stateowner, &lock_stp, NULL); 2703 if (status) 2704 goto out; 2705 } 2706 /* lock->lk_stateowner and lock_stp have been created or found */ 2707 filp = lock_stp->st_vfs_file; 2708 2709 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) { 2710 printk("NFSD: nfsd4_lock: permission denied!\n"); 2711 goto out; 2712 } 2713 2714 locks_init_lock(&file_lock); 2715 switch (lock->lk_type) { 2716 case NFS4_READ_LT: 2717 case NFS4_READW_LT: 2718 file_lock.fl_type = F_RDLCK; 2719 break; 2720 case NFS4_WRITE_LT: 2721 case NFS4_WRITEW_LT: 2722 file_lock.fl_type = F_WRLCK; 2723 break; 2724 default: 2725 status = nfserr_inval; 2726 goto out; 2727 } 2728 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner; 2729 file_lock.fl_pid = current->tgid; 2730 file_lock.fl_file = filp; 2731 file_lock.fl_flags = FL_POSIX; 2732 2733 file_lock.fl_start = lock->lk_offset; 2734 if ((lock->lk_length == ~(u64)0) || 2735 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length)) 2736 file_lock.fl_end = ~(u64)0; 2737 else 2738 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1; 2739 nfs4_transform_lock_offset(&file_lock); 2740 2741 /* 2742 * Try to lock the file in the VFS. 2743 * Note: locks.c uses the BKL to protect the inode's lock list. 2744 */ 2745 2746 status = posix_lock_file(filp, &file_lock); 2747 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private) 2748 file_lock.fl_ops->fl_release_private(&file_lock); 2749 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status); 2750 switch (-status) { 2751 case 0: /* success! */ 2752 update_stateid(&lock_stp->st_stateid); 2753 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 2754 sizeof(stateid_t)); 2755 goto out; 2756 case (EAGAIN): 2757 goto conflicting_lock; 2758 case (EDEADLK): 2759 status = nfserr_deadlock; 2760 default: 2761 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status); 2762 goto out_destroy_new_stateid; 2763 } 2764 2765 conflicting_lock: 2766 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 2767 status = nfserr_denied; 2768 /* XXX There is a race here. Future patch needed to provide 2769 * an atomic posix_lock_and_test_file 2770 */ 2771 if (!(conflock = posix_test_lock(filp, &file_lock))) { 2772 status = nfserr_serverfault; 2773 goto out; 2774 } 2775 nfs4_set_lock_denied(conflock, &lock->lk_denied); 2776 2777 out_destroy_new_stateid: 2778 if (lock->lk_is_new) { 2779 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n"); 2780 /* 2781 * An error encountered after instantiation of the new 2782 * stateid has forced us to destroy it. 2783 */ 2784 if (!seqid_mutating_err(status)) 2785 open_sop->so_seqid--; 2786 2787 release_state_owner(lock_stp, LOCK_STATE); 2788 } 2789 out: 2790 if (lock->lk_stateowner) 2791 nfs4_get_stateowner(lock->lk_stateowner); 2792 nfs4_unlock_state(); 2793 return status; 2794 } 2795 2796 /* 2797 * LOCKT operation 2798 */ 2799 int 2800 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt) 2801 { 2802 struct inode *inode; 2803 struct file file; 2804 struct file_lock file_lock; 2805 struct file_lock *conflicting_lock; 2806 int status; 2807 2808 if (nfs4_in_grace()) 2809 return nfserr_grace; 2810 2811 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 2812 return nfserr_inval; 2813 2814 lockt->lt_stateowner = NULL; 2815 nfs4_lock_state(); 2816 2817 status = nfserr_stale_clientid; 2818 if (STALE_CLIENTID(&lockt->lt_clientid)) { 2819 printk("NFSD: nfsd4_lockt: clientid is stale!\n"); 2820 goto out; 2821 } 2822 2823 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) { 2824 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 2825 if (status == nfserr_symlink) 2826 status = nfserr_inval; 2827 goto out; 2828 } 2829 2830 inode = current_fh->fh_dentry->d_inode; 2831 locks_init_lock(&file_lock); 2832 switch (lockt->lt_type) { 2833 case NFS4_READ_LT: 2834 case NFS4_READW_LT: 2835 file_lock.fl_type = F_RDLCK; 2836 break; 2837 case NFS4_WRITE_LT: 2838 case NFS4_WRITEW_LT: 2839 file_lock.fl_type = F_WRLCK; 2840 break; 2841 default: 2842 printk("NFSD: nfs4_lockt: bad lock type!\n"); 2843 status = nfserr_inval; 2844 goto out; 2845 } 2846 2847 lockt->lt_stateowner = find_lockstateowner_str(inode, 2848 &lockt->lt_clientid, &lockt->lt_owner); 2849 if (lockt->lt_stateowner) 2850 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 2851 file_lock.fl_pid = current->tgid; 2852 file_lock.fl_flags = FL_POSIX; 2853 2854 file_lock.fl_start = lockt->lt_offset; 2855 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length)) 2856 file_lock.fl_end = ~(u64)0; 2857 else 2858 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1; 2859 2860 nfs4_transform_lock_offset(&file_lock); 2861 2862 /* posix_test_lock uses the struct file _only_ to resolve the inode. 2863 * since LOCKT doesn't require an OPEN, and therefore a struct 2864 * file may not exist, pass posix_test_lock a struct file with 2865 * only the dentry:inode set. 2866 */ 2867 memset(&file, 0, sizeof (struct file)); 2868 file.f_dentry = current_fh->fh_dentry; 2869 2870 status = nfs_ok; 2871 conflicting_lock = posix_test_lock(&file, &file_lock); 2872 if (conflicting_lock) { 2873 status = nfserr_denied; 2874 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied); 2875 } 2876 out: 2877 nfs4_unlock_state(); 2878 return status; 2879 } 2880 2881 int 2882 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku) 2883 { 2884 struct nfs4_stateid *stp; 2885 struct file *filp = NULL; 2886 struct file_lock file_lock; 2887 int status; 2888 2889 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 2890 (long long) locku->lu_offset, 2891 (long long) locku->lu_length); 2892 2893 if (check_lock_length(locku->lu_offset, locku->lu_length)) 2894 return nfserr_inval; 2895 2896 nfs4_lock_state(); 2897 2898 if ((status = nfs4_preprocess_seqid_op(current_fh, 2899 locku->lu_seqid, 2900 &locku->lu_stateid, 2901 CHECK_FH | LOCK_STATE, 2902 &locku->lu_stateowner, &stp, NULL))) 2903 goto out; 2904 2905 filp = stp->st_vfs_file; 2906 BUG_ON(!filp); 2907 locks_init_lock(&file_lock); 2908 file_lock.fl_type = F_UNLCK; 2909 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 2910 file_lock.fl_pid = current->tgid; 2911 file_lock.fl_file = filp; 2912 file_lock.fl_flags = FL_POSIX; 2913 file_lock.fl_start = locku->lu_offset; 2914 2915 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length)) 2916 file_lock.fl_end = ~(u64)0; 2917 else 2918 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1; 2919 nfs4_transform_lock_offset(&file_lock); 2920 2921 /* 2922 * Try to unlock the file in the VFS. 2923 */ 2924 status = posix_lock_file(filp, &file_lock); 2925 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private) 2926 file_lock.fl_ops->fl_release_private(&file_lock); 2927 if (status) { 2928 printk("NFSD: nfs4_locku: posix_lock_file failed!\n"); 2929 goto out_nfserr; 2930 } 2931 /* 2932 * OK, unlock succeeded; the only thing left to do is update the stateid. 2933 */ 2934 update_stateid(&stp->st_stateid); 2935 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 2936 2937 out: 2938 if (locku->lu_stateowner) 2939 nfs4_get_stateowner(locku->lu_stateowner); 2940 nfs4_unlock_state(); 2941 return status; 2942 2943 out_nfserr: 2944 status = nfserrno(status); 2945 goto out; 2946 } 2947 2948 /* 2949 * returns 2950 * 1: locks held by lockowner 2951 * 0: no locks held by lockowner 2952 */ 2953 static int 2954 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner) 2955 { 2956 struct file_lock **flpp; 2957 struct inode *inode = filp->f_dentry->d_inode; 2958 int status = 0; 2959 2960 lock_kernel(); 2961 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 2962 if ((*flpp)->fl_owner == (fl_owner_t)lowner) 2963 status = 1; 2964 goto out; 2965 } 2966 out: 2967 unlock_kernel(); 2968 return status; 2969 } 2970 2971 int 2972 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner) 2973 { 2974 clientid_t *clid = &rlockowner->rl_clientid; 2975 struct nfs4_stateowner *local = NULL; 2976 struct xdr_netobj *owner = &rlockowner->rl_owner; 2977 int status; 2978 2979 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 2980 clid->cl_boot, clid->cl_id); 2981 2982 /* XXX check for lease expiration */ 2983 2984 status = nfserr_stale_clientid; 2985 if (STALE_CLIENTID(clid)) { 2986 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n"); 2987 return status; 2988 } 2989 2990 nfs4_lock_state(); 2991 2992 status = nfs_ok; 2993 local = find_lockstateowner(owner, clid); 2994 if (local) { 2995 struct nfs4_stateid *stp; 2996 2997 /* check for any locks held by any stateid 2998 * associated with the (lock) stateowner */ 2999 status = nfserr_locks_held; 3000 list_for_each_entry(stp, &local->so_perfilestate, 3001 st_perfilestate) { 3002 if (check_for_locks(stp->st_vfs_file, local)) 3003 goto out; 3004 } 3005 /* no locks held by (lock) stateowner */ 3006 status = nfs_ok; 3007 release_stateowner(local); 3008 } 3009 out: 3010 nfs4_unlock_state(); 3011 return status; 3012 } 3013 3014 static inline struct nfs4_client_reclaim * 3015 alloc_reclaim(int namelen) 3016 { 3017 struct nfs4_client_reclaim *crp = NULL; 3018 3019 crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 3020 if (!crp) 3021 return NULL; 3022 crp->cr_name.data = kmalloc(namelen, GFP_KERNEL); 3023 if (!crp->cr_name.data) { 3024 kfree(crp); 3025 return NULL; 3026 } 3027 return crp; 3028 } 3029 3030 /* 3031 * failure => all reset bets are off, nfserr_no_grace... 3032 */ 3033 static int 3034 nfs4_client_to_reclaim(char *name, int namlen) 3035 { 3036 unsigned int strhashval; 3037 struct nfs4_client_reclaim *crp = NULL; 3038 3039 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name); 3040 crp = alloc_reclaim(namlen); 3041 if (!crp) 3042 return 0; 3043 strhashval = clientstr_hashval(name, namlen); 3044 INIT_LIST_HEAD(&crp->cr_strhash); 3045 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 3046 memcpy(crp->cr_name.data, name, namlen); 3047 crp->cr_name.len = namlen; 3048 reclaim_str_hashtbl_size++; 3049 return 1; 3050 } 3051 3052 static void 3053 nfs4_release_reclaim(void) 3054 { 3055 struct nfs4_client_reclaim *crp = NULL; 3056 int i; 3057 3058 BUG_ON(!nfs4_reclaim_init); 3059 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3060 while (!list_empty(&reclaim_str_hashtbl[i])) { 3061 crp = list_entry(reclaim_str_hashtbl[i].next, 3062 struct nfs4_client_reclaim, cr_strhash); 3063 list_del(&crp->cr_strhash); 3064 kfree(crp->cr_name.data); 3065 kfree(crp); 3066 reclaim_str_hashtbl_size--; 3067 } 3068 } 3069 BUG_ON(reclaim_str_hashtbl_size); 3070 } 3071 3072 /* 3073 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 3074 struct nfs4_client_reclaim * 3075 nfs4_find_reclaim_client(clientid_t *clid) 3076 { 3077 unsigned int strhashval; 3078 struct nfs4_client *clp; 3079 struct nfs4_client_reclaim *crp = NULL; 3080 3081 3082 /* find clientid in conf_id_hashtbl */ 3083 clp = find_confirmed_client(clid); 3084 if (clp == NULL) 3085 return NULL; 3086 3087 dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n", 3088 clp->cl_name.len, clp->cl_name.data); 3089 3090 /* find clp->cl_name in reclaim_str_hashtbl */ 3091 strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len); 3092 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 3093 if (cmp_name(&crp->cr_name, &clp->cl_name)) { 3094 return crp; 3095 } 3096 } 3097 return NULL; 3098 } 3099 3100 /* 3101 * Called from OPEN. Look for clientid in reclaim list. 3102 */ 3103 int 3104 nfs4_check_open_reclaim(clientid_t *clid) 3105 { 3106 struct nfs4_client_reclaim *crp; 3107 3108 if ((crp = nfs4_find_reclaim_client(clid)) == NULL) 3109 return nfserr_reclaim_bad; 3110 return nfs_ok; 3111 } 3112 3113 3114 /* 3115 * Start and stop routines 3116 */ 3117 3118 static void 3119 __nfs4_state_init(void) 3120 { 3121 int i; 3122 time_t grace_time; 3123 3124 if (!nfs4_reclaim_init) { 3125 for (i = 0; i < CLIENT_HASH_SIZE; i++) 3126 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 3127 reclaim_str_hashtbl_size = 0; 3128 nfs4_reclaim_init = 1; 3129 } 3130 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3131 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 3132 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 3133 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 3134 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 3135 } 3136 for (i = 0; i < FILE_HASH_SIZE; i++) { 3137 INIT_LIST_HEAD(&file_hashtbl[i]); 3138 } 3139 for (i = 0; i < OWNER_HASH_SIZE; i++) { 3140 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 3141 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 3142 } 3143 for (i = 0; i < STATEID_HASH_SIZE; i++) { 3144 INIT_LIST_HEAD(&stateid_hashtbl[i]); 3145 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 3146 } 3147 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3148 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 3149 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 3150 } 3151 memset(&zerostateid, 0, sizeof(stateid_t)); 3152 memset(&onestateid, ~0, sizeof(stateid_t)); 3153 3154 INIT_LIST_HEAD(&close_lru); 3155 INIT_LIST_HEAD(&client_lru); 3156 INIT_LIST_HEAD(&del_recall_lru); 3157 spin_lock_init(&recall_lock); 3158 boot_time = get_seconds(); 3159 grace_time = max(old_lease_time, lease_time); 3160 if (reclaim_str_hashtbl_size == 0) 3161 grace_time = 0; 3162 if (grace_time) 3163 printk("NFSD: starting %ld-second grace period\n", grace_time); 3164 grace_end = boot_time + grace_time; 3165 INIT_WORK(&laundromat_work,laundromat_main, NULL); 3166 schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ); 3167 } 3168 3169 int 3170 nfs4_state_init(void) 3171 { 3172 int status; 3173 3174 if (nfs4_init) 3175 return 0; 3176 status = nfsd4_init_slabs(); 3177 if (status) 3178 return status; 3179 __nfs4_state_init(); 3180 nfs4_init = 1; 3181 return 0; 3182 } 3183 3184 int 3185 nfs4_in_grace(void) 3186 { 3187 return get_seconds() < grace_end; 3188 } 3189 3190 void 3191 set_no_grace(void) 3192 { 3193 printk("NFSD: ERROR in reboot recovery. State reclaims will fail.\n"); 3194 grace_end = get_seconds(); 3195 } 3196 3197 time_t 3198 nfs4_lease_time(void) 3199 { 3200 return lease_time; 3201 } 3202 3203 static void 3204 __nfs4_state_shutdown(void) 3205 { 3206 int i; 3207 struct nfs4_client *clp = NULL; 3208 struct nfs4_delegation *dp = NULL; 3209 struct nfs4_stateowner *sop = NULL; 3210 struct list_head *pos, *next, reaplist; 3211 3212 list_for_each_safe(pos, next, &close_lru) { 3213 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 3214 list_del(&sop->so_close_lru); 3215 nfs4_put_stateowner(sop); 3216 } 3217 3218 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3219 while (!list_empty(&conf_id_hashtbl[i])) { 3220 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 3221 expire_client(clp); 3222 } 3223 while (!list_empty(&unconf_str_hashtbl[i])) { 3224 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 3225 expire_client(clp); 3226 } 3227 } 3228 INIT_LIST_HEAD(&reaplist); 3229 spin_lock(&recall_lock); 3230 list_for_each_safe(pos, next, &del_recall_lru) { 3231 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3232 list_move(&dp->dl_recall_lru, &reaplist); 3233 } 3234 spin_unlock(&recall_lock); 3235 list_for_each_safe(pos, next, &reaplist) { 3236 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 3237 list_del_init(&dp->dl_recall_lru); 3238 unhash_delegation(dp); 3239 } 3240 3241 release_all_files(); 3242 cancel_delayed_work(&laundromat_work); 3243 flush_scheduled_work(); 3244 nfs4_init = 0; 3245 dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n", 3246 list_add_perfile, list_del_perfile); 3247 dprintk("NFSD: add_perclient %d del_perclient %d\n", 3248 add_perclient, del_perclient); 3249 dprintk("NFSD: alloc_file %d free_file %d\n", 3250 alloc_file, free_file); 3251 dprintk("NFSD: vfsopen %d vfsclose %d\n", 3252 vfsopen, vfsclose); 3253 dprintk("NFSD: alloc_delegation %d free_delegation %d\n", 3254 alloc_delegation, free_delegation); 3255 3256 } 3257 3258 void 3259 nfs4_state_shutdown(void) 3260 { 3261 nfs4_lock_state(); 3262 nfs4_release_reclaim(); 3263 __nfs4_state_shutdown(); 3264 nfsd4_free_slabs(); 3265 nfs4_unlock_state(); 3266 } 3267 3268 /* 3269 * Called when leasetime is changed. 3270 * 3271 * if nfsd is not started, simply set the global lease. 3272 * 3273 * if nfsd(s) are running, lease change requires nfsv4 state to be reset. 3274 * e.g: boot_time is reset, existing nfs4_client structs are 3275 * used to fill reclaim_str_hashtbl, then all state (except for the 3276 * reclaim_str_hashtbl) is re-initialized. 3277 * 3278 * if the old lease time is greater than the new lease time, the grace 3279 * period needs to be set to the old lease time to allow clients to reclaim 3280 * their state. XXX - we may want to set the grace period == lease time 3281 * after an initial grace period == old lease time 3282 * 3283 * if an error occurs in this process, the new lease is set, but the server 3284 * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace 3285 * which means OPEN/LOCK/READ/WRITE will fail during grace period. 3286 * 3287 * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and 3288 * OPEN and LOCK reclaims. 3289 */ 3290 void 3291 nfs4_reset_lease(time_t leasetime) 3292 { 3293 struct nfs4_client *clp; 3294 int i; 3295 3296 printk("NFSD: New leasetime %ld\n",leasetime); 3297 if (!nfs4_init) 3298 return; 3299 nfs4_lock_state(); 3300 old_lease_time = lease_time; 3301 lease_time = leasetime; 3302 3303 nfs4_release_reclaim(); 3304 3305 /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */ 3306 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3307 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) { 3308 if (!nfs4_client_to_reclaim(clp->cl_name.data, 3309 clp->cl_name.len)) { 3310 nfs4_release_reclaim(); 3311 goto init_state; 3312 } 3313 } 3314 } 3315 init_state: 3316 __nfs4_state_shutdown(); 3317 __nfs4_state_init(); 3318 nfs4_unlock_state(); 3319 } 3320 3321