1 /* 2 * linux/fs/nfsd/nfs4state.c 3 * 4 * Copyright (c) 2001 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Kendrick Smith <kmsmith@umich.edu> 8 * Andy Adamson <kandros@umich.edu> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 * 35 */ 36 37 #include <linux/param.h> 38 #include <linux/major.h> 39 #include <linux/slab.h> 40 41 #include <linux/sunrpc/svc.h> 42 #include <linux/nfsd/nfsd.h> 43 #include <linux/nfsd/cache.h> 44 #include <linux/file.h> 45 #include <linux/mount.h> 46 #include <linux/workqueue.h> 47 #include <linux/smp_lock.h> 48 #include <linux/kthread.h> 49 #include <linux/nfs4.h> 50 #include <linux/nfsd/state.h> 51 #include <linux/nfsd/xdr4.h> 52 #include <linux/namei.h> 53 #include <linux/swap.h> 54 #include <linux/mutex.h> 55 #include <linux/lockd/bind.h> 56 #include <linux/module.h> 57 #include <linux/sunrpc/svcauth_gss.h> 58 #include <linux/sunrpc/clnt.h> 59 60 #define NFSDDBG_FACILITY NFSDDBG_PROC 61 62 /* Globals */ 63 static time_t lease_time = 90; /* default lease time */ 64 static time_t user_lease_time = 90; 65 static time_t boot_time; 66 static u32 current_ownerid = 1; 67 static u32 current_fileid = 1; 68 static u32 current_delegid = 1; 69 static u32 nfs4_init; 70 static stateid_t zerostateid; /* bits all 0 */ 71 static stateid_t onestateid; /* bits all 1 */ 72 static u64 current_sessionid = 1; 73 74 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t))) 75 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t))) 76 77 /* forward declarations */ 78 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); 79 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); 80 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; 81 static void nfs4_set_recdir(char *recdir); 82 83 /* Locking: */ 84 85 /* Currently used for almost all code touching nfsv4 state: */ 86 static DEFINE_MUTEX(client_mutex); 87 88 /* 89 * Currently used for the del_recall_lru and file hash table. In an 90 * effort to decrease the scope of the client_mutex, this spinlock may 91 * eventually cover more: 92 */ 93 static DEFINE_SPINLOCK(recall_lock); 94 95 static struct kmem_cache *stateowner_slab = NULL; 96 static struct kmem_cache *file_slab = NULL; 97 static struct kmem_cache *stateid_slab = NULL; 98 static struct kmem_cache *deleg_slab = NULL; 99 100 void 101 nfs4_lock_state(void) 102 { 103 mutex_lock(&client_mutex); 104 } 105 106 void 107 nfs4_unlock_state(void) 108 { 109 mutex_unlock(&client_mutex); 110 } 111 112 static inline u32 113 opaque_hashval(const void *ptr, int nbytes) 114 { 115 unsigned char *cptr = (unsigned char *) ptr; 116 117 u32 x = 0; 118 while (nbytes--) { 119 x *= 37; 120 x += *cptr++; 121 } 122 return x; 123 } 124 125 static struct list_head del_recall_lru; 126 127 static inline void 128 put_nfs4_file(struct nfs4_file *fi) 129 { 130 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { 131 list_del(&fi->fi_hash); 132 spin_unlock(&recall_lock); 133 iput(fi->fi_inode); 134 kmem_cache_free(file_slab, fi); 135 } 136 } 137 138 static inline void 139 get_nfs4_file(struct nfs4_file *fi) 140 { 141 atomic_inc(&fi->fi_ref); 142 } 143 144 static int num_delegations; 145 unsigned int max_delegations; 146 147 /* 148 * Open owner state (share locks) 149 */ 150 151 /* hash tables for nfs4_stateowner */ 152 #define OWNER_HASH_BITS 8 153 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 154 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 155 156 #define ownerid_hashval(id) \ 157 ((id) & OWNER_HASH_MASK) 158 #define ownerstr_hashval(clientid, ownername) \ 159 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 160 161 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 162 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 163 164 /* hash table for nfs4_file */ 165 #define FILE_HASH_BITS 8 166 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 167 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 168 /* hash table for (open)nfs4_stateid */ 169 #define STATEID_HASH_BITS 10 170 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 171 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 172 173 #define file_hashval(x) \ 174 hash_ptr(x, FILE_HASH_BITS) 175 #define stateid_hashval(owner_id, file_id) \ 176 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 177 178 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 179 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 180 181 static struct nfs4_delegation * 182 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 183 { 184 struct nfs4_delegation *dp; 185 struct nfs4_file *fp = stp->st_file; 186 struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn; 187 188 dprintk("NFSD alloc_init_deleg\n"); 189 if (fp->fi_had_conflict) 190 return NULL; 191 if (num_delegations > max_delegations) 192 return NULL; 193 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); 194 if (dp == NULL) 195 return dp; 196 num_delegations++; 197 INIT_LIST_HEAD(&dp->dl_perfile); 198 INIT_LIST_HEAD(&dp->dl_perclnt); 199 INIT_LIST_HEAD(&dp->dl_recall_lru); 200 dp->dl_client = clp; 201 get_nfs4_file(fp); 202 dp->dl_file = fp; 203 dp->dl_flock = NULL; 204 get_file(stp->st_vfs_file); 205 dp->dl_vfs_file = stp->st_vfs_file; 206 dp->dl_type = type; 207 dp->dl_ident = cb->cb_ident; 208 dp->dl_stateid.si_boot = get_seconds(); 209 dp->dl_stateid.si_stateownerid = current_delegid++; 210 dp->dl_stateid.si_fileid = 0; 211 dp->dl_stateid.si_generation = 0; 212 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle); 213 dp->dl_time = 0; 214 atomic_set(&dp->dl_count, 1); 215 list_add(&dp->dl_perfile, &fp->fi_delegations); 216 list_add(&dp->dl_perclnt, &clp->cl_delegations); 217 return dp; 218 } 219 220 void 221 nfs4_put_delegation(struct nfs4_delegation *dp) 222 { 223 if (atomic_dec_and_test(&dp->dl_count)) { 224 dprintk("NFSD: freeing dp %p\n",dp); 225 put_nfs4_file(dp->dl_file); 226 kmem_cache_free(deleg_slab, dp); 227 num_delegations--; 228 } 229 } 230 231 /* Remove the associated file_lock first, then remove the delegation. 232 * lease_modify() is called to remove the FS_LEASE file_lock from 233 * the i_flock list, eventually calling nfsd's lock_manager 234 * fl_release_callback. 235 */ 236 static void 237 nfs4_close_delegation(struct nfs4_delegation *dp) 238 { 239 struct file *filp = dp->dl_vfs_file; 240 241 dprintk("NFSD: close_delegation dp %p\n",dp); 242 dp->dl_vfs_file = NULL; 243 /* The following nfsd_close may not actually close the file, 244 * but we want to remove the lease in any case. */ 245 if (dp->dl_flock) 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock); 247 nfsd_close(filp); 248 } 249 250 /* Called under the state lock. */ 251 static void 252 unhash_delegation(struct nfs4_delegation *dp) 253 { 254 list_del_init(&dp->dl_perfile); 255 list_del_init(&dp->dl_perclnt); 256 spin_lock(&recall_lock); 257 list_del_init(&dp->dl_recall_lru); 258 spin_unlock(&recall_lock); 259 nfs4_close_delegation(dp); 260 nfs4_put_delegation(dp); 261 } 262 263 /* 264 * SETCLIENTID state 265 */ 266 267 /* Hash tables for nfs4_clientid state */ 268 #define CLIENT_HASH_BITS 4 269 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 270 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 271 272 #define clientid_hashval(id) \ 273 ((id) & CLIENT_HASH_MASK) 274 #define clientstr_hashval(name) \ 275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK) 276 /* 277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 278 * used in reboot/reset lease grace period processing 279 * 280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 281 * setclientid_confirmed info. 282 * 283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 284 * setclientid info. 285 * 286 * client_lru holds client queue ordered by nfs4_client.cl_time 287 * for lease renewal. 288 * 289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 290 * for last close replay. 291 */ 292 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 293 static int reclaim_str_hashtbl_size = 0; 294 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 295 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 296 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 297 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 298 static struct list_head client_lru; 299 static struct list_head close_lru; 300 301 static void unhash_generic_stateid(struct nfs4_stateid *stp) 302 { 303 list_del(&stp->st_hash); 304 list_del(&stp->st_perfile); 305 list_del(&stp->st_perstateowner); 306 } 307 308 static void free_generic_stateid(struct nfs4_stateid *stp) 309 { 310 put_nfs4_file(stp->st_file); 311 kmem_cache_free(stateid_slab, stp); 312 } 313 314 static void release_lock_stateid(struct nfs4_stateid *stp) 315 { 316 unhash_generic_stateid(stp); 317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner); 318 free_generic_stateid(stp); 319 } 320 321 static void unhash_lockowner(struct nfs4_stateowner *sop) 322 { 323 struct nfs4_stateid *stp; 324 325 list_del(&sop->so_idhash); 326 list_del(&sop->so_strhash); 327 list_del(&sop->so_perstateid); 328 while (!list_empty(&sop->so_stateids)) { 329 stp = list_first_entry(&sop->so_stateids, 330 struct nfs4_stateid, st_perstateowner); 331 release_lock_stateid(stp); 332 } 333 } 334 335 static void release_lockowner(struct nfs4_stateowner *sop) 336 { 337 unhash_lockowner(sop); 338 nfs4_put_stateowner(sop); 339 } 340 341 static void 342 release_stateid_lockowners(struct nfs4_stateid *open_stp) 343 { 344 struct nfs4_stateowner *lock_sop; 345 346 while (!list_empty(&open_stp->st_lockowners)) { 347 lock_sop = list_entry(open_stp->st_lockowners.next, 348 struct nfs4_stateowner, so_perstateid); 349 /* list_del(&open_stp->st_lockowners); */ 350 BUG_ON(lock_sop->so_is_open_owner); 351 release_lockowner(lock_sop); 352 } 353 } 354 355 static void release_open_stateid(struct nfs4_stateid *stp) 356 { 357 unhash_generic_stateid(stp); 358 release_stateid_lockowners(stp); 359 nfsd_close(stp->st_vfs_file); 360 free_generic_stateid(stp); 361 } 362 363 static void unhash_openowner(struct nfs4_stateowner *sop) 364 { 365 struct nfs4_stateid *stp; 366 367 list_del(&sop->so_idhash); 368 list_del(&sop->so_strhash); 369 list_del(&sop->so_perclient); 370 list_del(&sop->so_perstateid); /* XXX: necessary? */ 371 while (!list_empty(&sop->so_stateids)) { 372 stp = list_first_entry(&sop->so_stateids, 373 struct nfs4_stateid, st_perstateowner); 374 release_open_stateid(stp); 375 } 376 } 377 378 static void release_openowner(struct nfs4_stateowner *sop) 379 { 380 unhash_openowner(sop); 381 list_del(&sop->so_close_lru); 382 nfs4_put_stateowner(sop); 383 } 384 385 static DEFINE_SPINLOCK(sessionid_lock); 386 #define SESSION_HASH_SIZE 512 387 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE]; 388 389 static inline int 390 hash_sessionid(struct nfs4_sessionid *sessionid) 391 { 392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; 393 394 return sid->sequence % SESSION_HASH_SIZE; 395 } 396 397 static inline void 398 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) 399 { 400 u32 *ptr = (u32 *)(&sessionid->data[0]); 401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); 402 } 403 404 static void 405 gen_sessionid(struct nfsd4_session *ses) 406 { 407 struct nfs4_client *clp = ses->se_client; 408 struct nfsd4_sessionid *sid; 409 410 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; 411 sid->clientid = clp->cl_clientid; 412 sid->sequence = current_sessionid++; 413 sid->reserved = 0; 414 } 415 416 /* 417 * The protocol defines ca_maxresponssize_cached to include the size of 418 * the rpc header, but all we need to cache is the data starting after 419 * the end of the initial SEQUENCE operation--the rest we regenerate 420 * each time. Therefore we can advertise a ca_maxresponssize_cached 421 * value that is the number of bytes in our cache plus a few additional 422 * bytes. In order to stay on the safe side, and not promise more than 423 * we can cache, those additional bytes must be the minimum possible: 24 424 * bytes of rpc header (xid through accept state, with AUTH_NULL 425 * verifier), 12 for the compound header (with zero-length tag), and 44 426 * for the SEQUENCE op response: 427 */ 428 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) 429 430 /* 431 * Give the client the number of ca_maxresponsesize_cached slots it 432 * requests, of size bounded by NFSD_SLOT_CACHE_SIZE, 433 * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more 434 * than NFSD_MAX_SLOTS_PER_SESSION. 435 * 436 * If we run out of reserved DRC memory we should (up to a point) 437 * re-negotiate active sessions and reduce their slot usage to make 438 * rooom for new connections. For now we just fail the create session. 439 */ 440 static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan) 441 { 442 int mem, size = fchan->maxresp_cached; 443 444 if (fchan->maxreqs < 1) 445 return nfserr_inval; 446 447 if (size < NFSD_MIN_HDR_SEQ_SZ) 448 size = NFSD_MIN_HDR_SEQ_SZ; 449 size -= NFSD_MIN_HDR_SEQ_SZ; 450 if (size > NFSD_SLOT_CACHE_SIZE) 451 size = NFSD_SLOT_CACHE_SIZE; 452 453 /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */ 454 mem = fchan->maxreqs * size; 455 if (mem > NFSD_MAX_MEM_PER_SESSION) { 456 fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size; 457 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION) 458 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION; 459 mem = fchan->maxreqs * size; 460 } 461 462 spin_lock(&nfsd_drc_lock); 463 /* bound the total session drc memory ussage */ 464 if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) { 465 fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size; 466 mem = fchan->maxreqs * size; 467 } 468 nfsd_drc_mem_used += mem; 469 spin_unlock(&nfsd_drc_lock); 470 471 if (fchan->maxreqs == 0) 472 return nfserr_serverfault; 473 474 fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ; 475 return 0; 476 } 477 478 /* 479 * fchan holds the client values on input, and the server values on output 480 */ 481 static int init_forechannel_attrs(struct svc_rqst *rqstp, 482 struct nfsd4_channel_attrs *session_fchan, 483 struct nfsd4_channel_attrs *fchan) 484 { 485 int status = 0; 486 __u32 maxcount = svc_max_payload(rqstp); 487 488 /* headerpadsz set to zero in encode routine */ 489 490 /* Use the client's max request and max response size if possible */ 491 if (fchan->maxreq_sz > maxcount) 492 fchan->maxreq_sz = maxcount; 493 session_fchan->maxreq_sz = fchan->maxreq_sz; 494 495 if (fchan->maxresp_sz > maxcount) 496 fchan->maxresp_sz = maxcount; 497 session_fchan->maxresp_sz = fchan->maxresp_sz; 498 499 /* Use the client's maxops if possible */ 500 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND) 501 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND; 502 session_fchan->maxops = fchan->maxops; 503 504 /* FIXME: Error means no more DRC pages so the server should 505 * recover pages from existing sessions. For now fail session 506 * creation. 507 */ 508 status = set_forechannel_drc_size(fchan); 509 510 session_fchan->maxresp_cached = fchan->maxresp_cached; 511 session_fchan->maxreqs = fchan->maxreqs; 512 513 dprintk("%s status %d\n", __func__, status); 514 return status; 515 } 516 517 static void 518 free_session_slots(struct nfsd4_session *ses) 519 { 520 int i; 521 522 for (i = 0; i < ses->se_fchannel.maxreqs; i++) 523 kfree(ses->se_slots[i]); 524 } 525 526 static int 527 alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, 528 struct nfsd4_create_session *cses) 529 { 530 struct nfsd4_session *new, tmp; 531 struct nfsd4_slot *sp; 532 int idx, slotsize, cachesize, i; 533 int status; 534 535 memset(&tmp, 0, sizeof(tmp)); 536 537 /* FIXME: For now, we just accept the client back channel attributes. */ 538 tmp.se_bchannel = cses->back_channel; 539 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel, 540 &cses->fore_channel); 541 if (status) 542 goto out; 543 544 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot) 545 + sizeof(struct nfsd4_session) > PAGE_SIZE); 546 547 status = nfserr_serverfault; 548 /* allocate struct nfsd4_session and slot table pointers in one piece */ 549 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *); 550 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL); 551 if (!new) 552 goto out; 553 554 memcpy(new, &tmp, sizeof(*new)); 555 556 /* allocate each struct nfsd4_slot and data cache in one piece */ 557 cachesize = new->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; 558 for (i = 0; i < new->se_fchannel.maxreqs; i++) { 559 sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL); 560 if (!sp) 561 goto out_free; 562 new->se_slots[i] = sp; 563 } 564 565 new->se_client = clp; 566 gen_sessionid(new); 567 idx = hash_sessionid(&new->se_sessionid); 568 memcpy(clp->cl_sessionid.data, new->se_sessionid.data, 569 NFS4_MAX_SESSIONID_LEN); 570 571 new->se_flags = cses->flags; 572 kref_init(&new->se_ref); 573 spin_lock(&sessionid_lock); 574 list_add(&new->se_hash, &sessionid_hashtbl[idx]); 575 list_add(&new->se_perclnt, &clp->cl_sessions); 576 spin_unlock(&sessionid_lock); 577 578 status = nfs_ok; 579 out: 580 return status; 581 out_free: 582 free_session_slots(new); 583 kfree(new); 584 goto out; 585 } 586 587 /* caller must hold sessionid_lock */ 588 static struct nfsd4_session * 589 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid) 590 { 591 struct nfsd4_session *elem; 592 int idx; 593 594 dump_sessionid(__func__, sessionid); 595 idx = hash_sessionid(sessionid); 596 dprintk("%s: idx is %d\n", __func__, idx); 597 /* Search in the appropriate list */ 598 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) { 599 dump_sessionid("list traversal", &elem->se_sessionid); 600 if (!memcmp(elem->se_sessionid.data, sessionid->data, 601 NFS4_MAX_SESSIONID_LEN)) { 602 return elem; 603 } 604 } 605 606 dprintk("%s: session not found\n", __func__); 607 return NULL; 608 } 609 610 /* caller must hold sessionid_lock */ 611 static void 612 unhash_session(struct nfsd4_session *ses) 613 { 614 list_del(&ses->se_hash); 615 list_del(&ses->se_perclnt); 616 } 617 618 static void 619 release_session(struct nfsd4_session *ses) 620 { 621 spin_lock(&sessionid_lock); 622 unhash_session(ses); 623 spin_unlock(&sessionid_lock); 624 nfsd4_put_session(ses); 625 } 626 627 void 628 free_session(struct kref *kref) 629 { 630 struct nfsd4_session *ses; 631 632 ses = container_of(kref, struct nfsd4_session, se_ref); 633 spin_lock(&nfsd_drc_lock); 634 nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE; 635 spin_unlock(&nfsd_drc_lock); 636 free_session_slots(ses); 637 kfree(ses); 638 } 639 640 static inline void 641 renew_client(struct nfs4_client *clp) 642 { 643 /* 644 * Move client to the end to the LRU list. 645 */ 646 dprintk("renewing client (clientid %08x/%08x)\n", 647 clp->cl_clientid.cl_boot, 648 clp->cl_clientid.cl_id); 649 list_move_tail(&clp->cl_lru, &client_lru); 650 clp->cl_time = get_seconds(); 651 } 652 653 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 654 static int 655 STALE_CLIENTID(clientid_t *clid) 656 { 657 if (clid->cl_boot == boot_time) 658 return 0; 659 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", 660 clid->cl_boot, clid->cl_id, boot_time); 661 return 1; 662 } 663 664 /* 665 * XXX Should we use a slab cache ? 666 * This type of memory management is somewhat inefficient, but we use it 667 * anyway since SETCLIENTID is not a common operation. 668 */ 669 static struct nfs4_client *alloc_client(struct xdr_netobj name) 670 { 671 struct nfs4_client *clp; 672 673 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); 674 if (clp == NULL) 675 return NULL; 676 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL); 677 if (clp->cl_name.data == NULL) { 678 kfree(clp); 679 return NULL; 680 } 681 memcpy(clp->cl_name.data, name.data, name.len); 682 clp->cl_name.len = name.len; 683 return clp; 684 } 685 686 static void 687 shutdown_callback_client(struct nfs4_client *clp) 688 { 689 struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; 690 691 if (clnt) { 692 /* 693 * Callback threads take a reference on the client, so there 694 * should be no outstanding callbacks at this point. 695 */ 696 clp->cl_cb_conn.cb_client = NULL; 697 rpc_shutdown_client(clnt); 698 } 699 } 700 701 static inline void 702 free_client(struct nfs4_client *clp) 703 { 704 shutdown_callback_client(clp); 705 if (clp->cl_cb_xprt) 706 svc_xprt_put(clp->cl_cb_xprt); 707 if (clp->cl_cred.cr_group_info) 708 put_group_info(clp->cl_cred.cr_group_info); 709 kfree(clp->cl_principal); 710 kfree(clp->cl_name.data); 711 kfree(clp); 712 } 713 714 void 715 put_nfs4_client(struct nfs4_client *clp) 716 { 717 if (atomic_dec_and_test(&clp->cl_count)) 718 free_client(clp); 719 } 720 721 static void 722 expire_client(struct nfs4_client *clp) 723 { 724 struct nfs4_stateowner *sop; 725 struct nfs4_delegation *dp; 726 struct list_head reaplist; 727 728 dprintk("NFSD: expire_client cl_count %d\n", 729 atomic_read(&clp->cl_count)); 730 731 INIT_LIST_HEAD(&reaplist); 732 spin_lock(&recall_lock); 733 while (!list_empty(&clp->cl_delegations)) { 734 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 735 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 736 dp->dl_flock); 737 list_del_init(&dp->dl_perclnt); 738 list_move(&dp->dl_recall_lru, &reaplist); 739 } 740 spin_unlock(&recall_lock); 741 while (!list_empty(&reaplist)) { 742 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 743 list_del_init(&dp->dl_recall_lru); 744 unhash_delegation(dp); 745 } 746 list_del(&clp->cl_idhash); 747 list_del(&clp->cl_strhash); 748 list_del(&clp->cl_lru); 749 while (!list_empty(&clp->cl_openowners)) { 750 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); 751 release_openowner(sop); 752 } 753 while (!list_empty(&clp->cl_sessions)) { 754 struct nfsd4_session *ses; 755 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, 756 se_perclnt); 757 release_session(ses); 758 } 759 put_nfs4_client(clp); 760 } 761 762 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) 763 { 764 memcpy(target->cl_verifier.data, source->data, 765 sizeof(target->cl_verifier.data)); 766 } 767 768 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) 769 { 770 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 771 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 772 } 773 774 static void copy_cred(struct svc_cred *target, struct svc_cred *source) 775 { 776 target->cr_uid = source->cr_uid; 777 target->cr_gid = source->cr_gid; 778 target->cr_group_info = source->cr_group_info; 779 get_group_info(target->cr_group_info); 780 } 781 782 static int same_name(const char *n1, const char *n2) 783 { 784 return 0 == memcmp(n1, n2, HEXDIR_LEN); 785 } 786 787 static int 788 same_verf(nfs4_verifier *v1, nfs4_verifier *v2) 789 { 790 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); 791 } 792 793 static int 794 same_clid(clientid_t *cl1, clientid_t *cl2) 795 { 796 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); 797 } 798 799 /* XXX what about NGROUP */ 800 static int 801 same_creds(struct svc_cred *cr1, struct svc_cred *cr2) 802 { 803 return cr1->cr_uid == cr2->cr_uid; 804 } 805 806 static void gen_clid(struct nfs4_client *clp) 807 { 808 static u32 current_clientid = 1; 809 810 clp->cl_clientid.cl_boot = boot_time; 811 clp->cl_clientid.cl_id = current_clientid++; 812 } 813 814 static void gen_confirm(struct nfs4_client *clp) 815 { 816 static u32 i; 817 u32 *p; 818 819 p = (u32 *)clp->cl_confirm.data; 820 *p++ = get_seconds(); 821 *p++ = i++; 822 } 823 824 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir, 825 struct svc_rqst *rqstp, nfs4_verifier *verf) 826 { 827 struct nfs4_client *clp; 828 struct sockaddr *sa = svc_addr(rqstp); 829 char *princ; 830 831 clp = alloc_client(name); 832 if (clp == NULL) 833 return NULL; 834 835 princ = svc_gss_principal(rqstp); 836 if (princ) { 837 clp->cl_principal = kstrdup(princ, GFP_KERNEL); 838 if (clp->cl_principal == NULL) { 839 free_client(clp); 840 return NULL; 841 } 842 } 843 844 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); 845 atomic_set(&clp->cl_count, 1); 846 atomic_set(&clp->cl_cb_conn.cb_set, 0); 847 INIT_LIST_HEAD(&clp->cl_idhash); 848 INIT_LIST_HEAD(&clp->cl_strhash); 849 INIT_LIST_HEAD(&clp->cl_openowners); 850 INIT_LIST_HEAD(&clp->cl_delegations); 851 INIT_LIST_HEAD(&clp->cl_sessions); 852 INIT_LIST_HEAD(&clp->cl_lru); 853 clear_bit(0, &clp->cl_cb_slot_busy); 854 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); 855 copy_verf(clp, verf); 856 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); 857 clp->cl_flavor = rqstp->rq_flavor; 858 copy_cred(&clp->cl_cred, &rqstp->rq_cred); 859 gen_confirm(clp); 860 861 return clp; 862 } 863 864 static int check_name(struct xdr_netobj name) 865 { 866 if (name.len == 0) 867 return 0; 868 if (name.len > NFS4_OPAQUE_LIMIT) { 869 dprintk("NFSD: check_name: name too long(%d)!\n", name.len); 870 return 0; 871 } 872 return 1; 873 } 874 875 static void 876 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 877 { 878 unsigned int idhashval; 879 880 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 881 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 882 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 883 list_add_tail(&clp->cl_lru, &client_lru); 884 clp->cl_time = get_seconds(); 885 } 886 887 static void 888 move_to_confirmed(struct nfs4_client *clp) 889 { 890 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 891 unsigned int strhashval; 892 893 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 894 list_del_init(&clp->cl_strhash); 895 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 896 strhashval = clientstr_hashval(clp->cl_recdir); 897 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 898 renew_client(clp); 899 } 900 901 static struct nfs4_client * 902 find_confirmed_client(clientid_t *clid) 903 { 904 struct nfs4_client *clp; 905 unsigned int idhashval = clientid_hashval(clid->cl_id); 906 907 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 908 if (same_clid(&clp->cl_clientid, clid)) 909 return clp; 910 } 911 return NULL; 912 } 913 914 static struct nfs4_client * 915 find_unconfirmed_client(clientid_t *clid) 916 { 917 struct nfs4_client *clp; 918 unsigned int idhashval = clientid_hashval(clid->cl_id); 919 920 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 921 if (same_clid(&clp->cl_clientid, clid)) 922 return clp; 923 } 924 return NULL; 925 } 926 927 /* 928 * Return 1 iff clp's clientid establishment method matches the use_exchange_id 929 * parameter. Matching is based on the fact the at least one of the 930 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1 931 * 932 * FIXME: we need to unify the clientid namespaces for nfsv4.x 933 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID 934 * and SET_CLIENTID{,_CONFIRM} 935 */ 936 static inline int 937 match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id) 938 { 939 bool has_exchange_flags = (clp->cl_exchange_flags != 0); 940 return use_exchange_id == has_exchange_flags; 941 } 942 943 static struct nfs4_client * 944 find_confirmed_client_by_str(const char *dname, unsigned int hashval, 945 bool use_exchange_id) 946 { 947 struct nfs4_client *clp; 948 949 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { 950 if (same_name(clp->cl_recdir, dname) && 951 match_clientid_establishment(clp, use_exchange_id)) 952 return clp; 953 } 954 return NULL; 955 } 956 957 static struct nfs4_client * 958 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval, 959 bool use_exchange_id) 960 { 961 struct nfs4_client *clp; 962 963 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { 964 if (same_name(clp->cl_recdir, dname) && 965 match_clientid_establishment(clp, use_exchange_id)) 966 return clp; 967 } 968 return NULL; 969 } 970 971 static void 972 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid) 973 { 974 struct nfs4_cb_conn *cb = &clp->cl_cb_conn; 975 unsigned short expected_family; 976 977 /* Currently, we only support tcp and tcp6 for the callback channel */ 978 if (se->se_callback_netid_len == 3 && 979 !memcmp(se->se_callback_netid_val, "tcp", 3)) 980 expected_family = AF_INET; 981 else if (se->se_callback_netid_len == 4 && 982 !memcmp(se->se_callback_netid_val, "tcp6", 4)) 983 expected_family = AF_INET6; 984 else 985 goto out_err; 986 987 cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val, 988 se->se_callback_addr_len, 989 (struct sockaddr *) &cb->cb_addr, 990 sizeof(cb->cb_addr)); 991 992 if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family) 993 goto out_err; 994 995 if (cb->cb_addr.ss_family == AF_INET6) 996 ((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid; 997 998 cb->cb_minorversion = 0; 999 cb->cb_prog = se->se_callback_prog; 1000 cb->cb_ident = se->se_callback_ident; 1001 return; 1002 out_err: 1003 cb->cb_addr.ss_family = AF_UNSPEC; 1004 cb->cb_addrlen = 0; 1005 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 1006 "will not receive delegations\n", 1007 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 1008 1009 return; 1010 } 1011 1012 /* 1013 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size. 1014 */ 1015 void 1016 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) 1017 { 1018 struct nfsd4_slot *slot = resp->cstate.slot; 1019 unsigned int base; 1020 1021 dprintk("--> %s slot %p\n", __func__, slot); 1022 1023 slot->sl_opcnt = resp->opcnt; 1024 slot->sl_status = resp->cstate.status; 1025 1026 if (nfsd4_not_cached(resp)) { 1027 slot->sl_datalen = 0; 1028 return; 1029 } 1030 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap; 1031 base = (char *)resp->cstate.datap - 1032 (char *)resp->xbuf->head[0].iov_base; 1033 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data, 1034 slot->sl_datalen)) 1035 WARN("%s: sessions DRC could not cache compound\n", __func__); 1036 return; 1037 } 1038 1039 /* 1040 * Encode the replay sequence operation from the slot values. 1041 * If cachethis is FALSE encode the uncached rep error on the next 1042 * operation which sets resp->p and increments resp->opcnt for 1043 * nfs4svc_encode_compoundres. 1044 * 1045 */ 1046 static __be32 1047 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, 1048 struct nfsd4_compoundres *resp) 1049 { 1050 struct nfsd4_op *op; 1051 struct nfsd4_slot *slot = resp->cstate.slot; 1052 1053 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__, 1054 resp->opcnt, resp->cstate.slot->sl_cachethis); 1055 1056 /* Encode the replayed sequence operation */ 1057 op = &args->ops[resp->opcnt - 1]; 1058 nfsd4_encode_operation(resp, op); 1059 1060 /* Return nfserr_retry_uncached_rep in next operation. */ 1061 if (args->opcnt > 1 && slot->sl_cachethis == 0) { 1062 op = &args->ops[resp->opcnt++]; 1063 op->status = nfserr_retry_uncached_rep; 1064 nfsd4_encode_operation(resp, op); 1065 } 1066 return op->status; 1067 } 1068 1069 /* 1070 * The sequence operation is not cached because we can use the slot and 1071 * session values. 1072 */ 1073 __be32 1074 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, 1075 struct nfsd4_sequence *seq) 1076 { 1077 struct nfsd4_slot *slot = resp->cstate.slot; 1078 __be32 status; 1079 1080 dprintk("--> %s slot %p\n", __func__, slot); 1081 1082 /* Either returns 0 or nfserr_retry_uncached */ 1083 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); 1084 if (status == nfserr_retry_uncached_rep) 1085 return status; 1086 1087 /* The sequence operation has been encoded, cstate->datap set. */ 1088 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen); 1089 1090 resp->opcnt = slot->sl_opcnt; 1091 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen); 1092 status = slot->sl_status; 1093 1094 return status; 1095 } 1096 1097 /* 1098 * Set the exchange_id flags returned by the server. 1099 */ 1100 static void 1101 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) 1102 { 1103 /* pNFS is not supported */ 1104 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; 1105 1106 /* Referrals are supported, Migration is not. */ 1107 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; 1108 1109 /* set the wire flags to return to client. */ 1110 clid->flags = new->cl_exchange_flags; 1111 } 1112 1113 __be32 1114 nfsd4_exchange_id(struct svc_rqst *rqstp, 1115 struct nfsd4_compound_state *cstate, 1116 struct nfsd4_exchange_id *exid) 1117 { 1118 struct nfs4_client *unconf, *conf, *new; 1119 int status; 1120 unsigned int strhashval; 1121 char dname[HEXDIR_LEN]; 1122 char addr_str[INET6_ADDRSTRLEN]; 1123 nfs4_verifier verf = exid->verifier; 1124 struct sockaddr *sa = svc_addr(rqstp); 1125 1126 rpc_ntop(sa, addr_str, sizeof(addr_str)); 1127 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " 1128 "ip_addr=%s flags %x, spa_how %d\n", 1129 __func__, rqstp, exid, exid->clname.len, exid->clname.data, 1130 addr_str, exid->flags, exid->spa_how); 1131 1132 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A)) 1133 return nfserr_inval; 1134 1135 /* Currently only support SP4_NONE */ 1136 switch (exid->spa_how) { 1137 case SP4_NONE: 1138 break; 1139 case SP4_SSV: 1140 return nfserr_encr_alg_unsupp; 1141 default: 1142 BUG(); /* checked by xdr code */ 1143 case SP4_MACH_CRED: 1144 return nfserr_serverfault; /* no excuse :-/ */ 1145 } 1146 1147 status = nfs4_make_rec_clidname(dname, &exid->clname); 1148 1149 if (status) 1150 goto error; 1151 1152 strhashval = clientstr_hashval(dname); 1153 1154 nfs4_lock_state(); 1155 status = nfs_ok; 1156 1157 conf = find_confirmed_client_by_str(dname, strhashval, true); 1158 if (conf) { 1159 if (!same_verf(&verf, &conf->cl_verifier)) { 1160 /* 18.35.4 case 8 */ 1161 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1162 status = nfserr_not_same; 1163 goto out; 1164 } 1165 /* Client reboot: destroy old state */ 1166 expire_client(conf); 1167 goto out_new; 1168 } 1169 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 1170 /* 18.35.4 case 9 */ 1171 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1172 status = nfserr_perm; 1173 goto out; 1174 } 1175 expire_client(conf); 1176 goto out_new; 1177 } 1178 /* 1179 * Set bit when the owner id and verifier map to an already 1180 * confirmed client id (18.35.3). 1181 */ 1182 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; 1183 1184 /* 1185 * Falling into 18.35.4 case 2, possible router replay. 1186 * Leave confirmed record intact and return same result. 1187 */ 1188 copy_verf(conf, &verf); 1189 new = conf; 1190 goto out_copy; 1191 } 1192 1193 /* 18.35.4 case 7 */ 1194 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1195 status = nfserr_noent; 1196 goto out; 1197 } 1198 1199 unconf = find_unconfirmed_client_by_str(dname, strhashval, true); 1200 if (unconf) { 1201 /* 1202 * Possible retry or client restart. Per 18.35.4 case 4, 1203 * a new unconfirmed record should be generated regardless 1204 * of whether any properties have changed. 1205 */ 1206 expire_client(unconf); 1207 } 1208 1209 out_new: 1210 /* Normal case */ 1211 new = create_client(exid->clname, dname, rqstp, &verf); 1212 if (new == NULL) { 1213 status = nfserr_serverfault; 1214 goto out; 1215 } 1216 1217 gen_clid(new); 1218 add_to_unconfirmed(new, strhashval); 1219 out_copy: 1220 exid->clientid.cl_boot = new->cl_clientid.cl_boot; 1221 exid->clientid.cl_id = new->cl_clientid.cl_id; 1222 1223 exid->seqid = 1; 1224 nfsd4_set_ex_flags(new, exid); 1225 1226 dprintk("nfsd4_exchange_id seqid %d flags %x\n", 1227 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags); 1228 status = nfs_ok; 1229 1230 out: 1231 nfs4_unlock_state(); 1232 error: 1233 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status)); 1234 return status; 1235 } 1236 1237 static int 1238 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) 1239 { 1240 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, 1241 slot_seqid); 1242 1243 /* The slot is in use, and no response has been sent. */ 1244 if (slot_inuse) { 1245 if (seqid == slot_seqid) 1246 return nfserr_jukebox; 1247 else 1248 return nfserr_seq_misordered; 1249 } 1250 /* Normal */ 1251 if (likely(seqid == slot_seqid + 1)) 1252 return nfs_ok; 1253 /* Replay */ 1254 if (seqid == slot_seqid) 1255 return nfserr_replay_cache; 1256 /* Wraparound */ 1257 if (seqid == 1 && (slot_seqid + 1) == 0) 1258 return nfs_ok; 1259 /* Misordered replay or misordered new request */ 1260 return nfserr_seq_misordered; 1261 } 1262 1263 /* 1264 * Cache the create session result into the create session single DRC 1265 * slot cache by saving the xdr structure. sl_seqid has been set. 1266 * Do this for solo or embedded create session operations. 1267 */ 1268 static void 1269 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, 1270 struct nfsd4_clid_slot *slot, int nfserr) 1271 { 1272 slot->sl_status = nfserr; 1273 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); 1274 } 1275 1276 static __be32 1277 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, 1278 struct nfsd4_clid_slot *slot) 1279 { 1280 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); 1281 return slot->sl_status; 1282 } 1283 1284 __be32 1285 nfsd4_create_session(struct svc_rqst *rqstp, 1286 struct nfsd4_compound_state *cstate, 1287 struct nfsd4_create_session *cr_ses) 1288 { 1289 struct sockaddr *sa = svc_addr(rqstp); 1290 struct nfs4_client *conf, *unconf; 1291 struct nfsd4_clid_slot *cs_slot = NULL; 1292 int status = 0; 1293 1294 nfs4_lock_state(); 1295 unconf = find_unconfirmed_client(&cr_ses->clientid); 1296 conf = find_confirmed_client(&cr_ses->clientid); 1297 1298 if (conf) { 1299 cs_slot = &conf->cl_cs_slot; 1300 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 1301 if (status == nfserr_replay_cache) { 1302 dprintk("Got a create_session replay! seqid= %d\n", 1303 cs_slot->sl_seqid); 1304 /* Return the cached reply status */ 1305 status = nfsd4_replay_create_session(cr_ses, cs_slot); 1306 goto out; 1307 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) { 1308 status = nfserr_seq_misordered; 1309 dprintk("Sequence misordered!\n"); 1310 dprintk("Expected seqid= %d but got seqid= %d\n", 1311 cs_slot->sl_seqid, cr_ses->seqid); 1312 goto out; 1313 } 1314 cs_slot->sl_seqid++; 1315 } else if (unconf) { 1316 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || 1317 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { 1318 status = nfserr_clid_inuse; 1319 goto out; 1320 } 1321 1322 cs_slot = &unconf->cl_cs_slot; 1323 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 1324 if (status) { 1325 /* an unconfirmed replay returns misordered */ 1326 status = nfserr_seq_misordered; 1327 goto out_cache; 1328 } 1329 1330 cs_slot->sl_seqid++; /* from 0 to 1 */ 1331 move_to_confirmed(unconf); 1332 1333 /* 1334 * We do not support RDMA or persistent sessions 1335 */ 1336 cr_ses->flags &= ~SESSION4_PERSIST; 1337 cr_ses->flags &= ~SESSION4_RDMA; 1338 1339 if (cr_ses->flags & SESSION4_BACK_CHAN) { 1340 unconf->cl_cb_xprt = rqstp->rq_xprt; 1341 svc_xprt_get(unconf->cl_cb_xprt); 1342 rpc_copy_addr( 1343 (struct sockaddr *)&unconf->cl_cb_conn.cb_addr, 1344 sa); 1345 unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa); 1346 unconf->cl_cb_conn.cb_minorversion = 1347 cstate->minorversion; 1348 unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog; 1349 unconf->cl_cb_seq_nr = 1; 1350 nfsd4_probe_callback(unconf); 1351 } 1352 conf = unconf; 1353 } else { 1354 status = nfserr_stale_clientid; 1355 goto out; 1356 } 1357 1358 status = alloc_init_session(rqstp, conf, cr_ses); 1359 if (status) 1360 goto out; 1361 1362 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data, 1363 NFS4_MAX_SESSIONID_LEN); 1364 cr_ses->seqid = cs_slot->sl_seqid; 1365 1366 out_cache: 1367 /* cache solo and embedded create sessions under the state lock */ 1368 nfsd4_cache_create_session(cr_ses, cs_slot, status); 1369 out: 1370 nfs4_unlock_state(); 1371 dprintk("%s returns %d\n", __func__, ntohl(status)); 1372 return status; 1373 } 1374 1375 __be32 1376 nfsd4_destroy_session(struct svc_rqst *r, 1377 struct nfsd4_compound_state *cstate, 1378 struct nfsd4_destroy_session *sessionid) 1379 { 1380 struct nfsd4_session *ses; 1381 u32 status = nfserr_badsession; 1382 1383 /* Notes: 1384 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid 1385 * - Should we return nfserr_back_chan_busy if waiting for 1386 * callbacks on to-be-destroyed session? 1387 * - Do we need to clear any callback info from previous session? 1388 */ 1389 1390 dump_sessionid(__func__, &sessionid->sessionid); 1391 spin_lock(&sessionid_lock); 1392 ses = find_in_sessionid_hashtbl(&sessionid->sessionid); 1393 if (!ses) { 1394 spin_unlock(&sessionid_lock); 1395 goto out; 1396 } 1397 1398 unhash_session(ses); 1399 spin_unlock(&sessionid_lock); 1400 1401 /* wait for callbacks */ 1402 shutdown_callback_client(ses->se_client); 1403 nfsd4_put_session(ses); 1404 status = nfs_ok; 1405 out: 1406 dprintk("%s returns %d\n", __func__, ntohl(status)); 1407 return status; 1408 } 1409 1410 __be32 1411 nfsd4_sequence(struct svc_rqst *rqstp, 1412 struct nfsd4_compound_state *cstate, 1413 struct nfsd4_sequence *seq) 1414 { 1415 struct nfsd4_compoundres *resp = rqstp->rq_resp; 1416 struct nfsd4_session *session; 1417 struct nfsd4_slot *slot; 1418 int status; 1419 1420 if (resp->opcnt != 1) 1421 return nfserr_sequence_pos; 1422 1423 spin_lock(&sessionid_lock); 1424 status = nfserr_badsession; 1425 session = find_in_sessionid_hashtbl(&seq->sessionid); 1426 if (!session) 1427 goto out; 1428 1429 status = nfserr_badslot; 1430 if (seq->slotid >= session->se_fchannel.maxreqs) 1431 goto out; 1432 1433 slot = session->se_slots[seq->slotid]; 1434 dprintk("%s: slotid %d\n", __func__, seq->slotid); 1435 1436 /* We do not negotiate the number of slots yet, so set the 1437 * maxslots to the session maxreqs which is used to encode 1438 * sr_highest_slotid and the sr_target_slot id to maxslots */ 1439 seq->maxslots = session->se_fchannel.maxreqs; 1440 1441 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse); 1442 if (status == nfserr_replay_cache) { 1443 cstate->slot = slot; 1444 cstate->session = session; 1445 /* Return the cached reply status and set cstate->status 1446 * for nfsd4_proc_compound processing */ 1447 status = nfsd4_replay_cache_entry(resp, seq); 1448 cstate->status = nfserr_replay_cache; 1449 goto out; 1450 } 1451 if (status) 1452 goto out; 1453 1454 /* Success! bump slot seqid */ 1455 slot->sl_inuse = true; 1456 slot->sl_seqid = seq->seqid; 1457 slot->sl_cachethis = seq->cachethis; 1458 1459 cstate->slot = slot; 1460 cstate->session = session; 1461 1462 /* Hold a session reference until done processing the compound: 1463 * nfsd4_put_session called only if the cstate slot is set. 1464 */ 1465 nfsd4_get_session(session); 1466 out: 1467 spin_unlock(&sessionid_lock); 1468 /* Renew the clientid on success and on replay */ 1469 if (cstate->session) { 1470 nfs4_lock_state(); 1471 renew_client(session->se_client); 1472 nfs4_unlock_state(); 1473 } 1474 dprintk("%s: return %d\n", __func__, ntohl(status)); 1475 return status; 1476 } 1477 1478 __be32 1479 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 1480 struct nfsd4_setclientid *setclid) 1481 { 1482 struct sockaddr *sa = svc_addr(rqstp); 1483 struct xdr_netobj clname = { 1484 .len = setclid->se_namelen, 1485 .data = setclid->se_name, 1486 }; 1487 nfs4_verifier clverifier = setclid->se_verf; 1488 unsigned int strhashval; 1489 struct nfs4_client *conf, *unconf, *new; 1490 __be32 status; 1491 char dname[HEXDIR_LEN]; 1492 1493 if (!check_name(clname)) 1494 return nfserr_inval; 1495 1496 status = nfs4_make_rec_clidname(dname, &clname); 1497 if (status) 1498 return status; 1499 1500 /* 1501 * XXX The Duplicate Request Cache (DRC) has been checked (??) 1502 * We get here on a DRC miss. 1503 */ 1504 1505 strhashval = clientstr_hashval(dname); 1506 1507 nfs4_lock_state(); 1508 conf = find_confirmed_client_by_str(dname, strhashval, false); 1509 if (conf) { 1510 /* RFC 3530 14.2.33 CASE 0: */ 1511 status = nfserr_clid_inuse; 1512 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 1513 char addr_str[INET6_ADDRSTRLEN]; 1514 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, 1515 sizeof(addr_str)); 1516 dprintk("NFSD: setclientid: string in use by client " 1517 "at %s\n", addr_str); 1518 goto out; 1519 } 1520 } 1521 /* 1522 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION") 1523 * has a description of SETCLIENTID request processing consisting 1524 * of 5 bullet points, labeled as CASE0 - CASE4 below. 1525 */ 1526 unconf = find_unconfirmed_client_by_str(dname, strhashval, false); 1527 status = nfserr_resource; 1528 if (!conf) { 1529 /* 1530 * RFC 3530 14.2.33 CASE 4: 1531 * placed first, because it is the normal case 1532 */ 1533 if (unconf) 1534 expire_client(unconf); 1535 new = create_client(clname, dname, rqstp, &clverifier); 1536 if (new == NULL) 1537 goto out; 1538 gen_clid(new); 1539 } else if (same_verf(&conf->cl_verifier, &clverifier)) { 1540 /* 1541 * RFC 3530 14.2.33 CASE 1: 1542 * probable callback update 1543 */ 1544 if (unconf) { 1545 /* Note this is removing unconfirmed {*x***}, 1546 * which is stronger than RFC recommended {vxc**}. 1547 * This has the advantage that there is at most 1548 * one {*x***} in either list at any time. 1549 */ 1550 expire_client(unconf); 1551 } 1552 new = create_client(clname, dname, rqstp, &clverifier); 1553 if (new == NULL) 1554 goto out; 1555 copy_clid(new, conf); 1556 } else if (!unconf) { 1557 /* 1558 * RFC 3530 14.2.33 CASE 2: 1559 * probable client reboot; state will be removed if 1560 * confirmed. 1561 */ 1562 new = create_client(clname, dname, rqstp, &clverifier); 1563 if (new == NULL) 1564 goto out; 1565 gen_clid(new); 1566 } else { 1567 /* 1568 * RFC 3530 14.2.33 CASE 3: 1569 * probable client reboot; state will be removed if 1570 * confirmed. 1571 */ 1572 expire_client(unconf); 1573 new = create_client(clname, dname, rqstp, &clverifier); 1574 if (new == NULL) 1575 goto out; 1576 gen_clid(new); 1577 } 1578 gen_callback(new, setclid, rpc_get_scope_id(sa)); 1579 add_to_unconfirmed(new, strhashval); 1580 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 1581 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 1582 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 1583 status = nfs_ok; 1584 out: 1585 nfs4_unlock_state(); 1586 return status; 1587 } 1588 1589 1590 /* 1591 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has 1592 * a description of SETCLIENTID_CONFIRM request processing consisting of 4 1593 * bullets, labeled as CASE1 - CASE4 below. 1594 */ 1595 __be32 1596 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 1597 struct nfsd4_compound_state *cstate, 1598 struct nfsd4_setclientid_confirm *setclientid_confirm) 1599 { 1600 struct sockaddr *sa = svc_addr(rqstp); 1601 struct nfs4_client *conf, *unconf; 1602 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 1603 clientid_t * clid = &setclientid_confirm->sc_clientid; 1604 __be32 status; 1605 1606 if (STALE_CLIENTID(clid)) 1607 return nfserr_stale_clientid; 1608 /* 1609 * XXX The Duplicate Request Cache (DRC) has been checked (??) 1610 * We get here on a DRC miss. 1611 */ 1612 1613 nfs4_lock_state(); 1614 1615 conf = find_confirmed_client(clid); 1616 unconf = find_unconfirmed_client(clid); 1617 1618 status = nfserr_clid_inuse; 1619 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa)) 1620 goto out; 1621 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa)) 1622 goto out; 1623 1624 /* 1625 * section 14.2.34 of RFC 3530 has a description of 1626 * SETCLIENTID_CONFIRM request processing consisting 1627 * of 4 bullet points, labeled as CASE1 - CASE4 below. 1628 */ 1629 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) { 1630 /* 1631 * RFC 3530 14.2.34 CASE 1: 1632 * callback update 1633 */ 1634 if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) 1635 status = nfserr_clid_inuse; 1636 else { 1637 /* XXX: We just turn off callbacks until we can handle 1638 * change request correctly. */ 1639 atomic_set(&conf->cl_cb_conn.cb_set, 0); 1640 expire_client(unconf); 1641 status = nfs_ok; 1642 1643 } 1644 } else if (conf && !unconf) { 1645 /* 1646 * RFC 3530 14.2.34 CASE 2: 1647 * probable retransmitted request; play it safe and 1648 * do nothing. 1649 */ 1650 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) 1651 status = nfserr_clid_inuse; 1652 else 1653 status = nfs_ok; 1654 } else if (!conf && unconf 1655 && same_verf(&unconf->cl_confirm, &confirm)) { 1656 /* 1657 * RFC 3530 14.2.34 CASE 3: 1658 * Normal case; new or rebooted client: 1659 */ 1660 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 1661 status = nfserr_clid_inuse; 1662 } else { 1663 unsigned int hash = 1664 clientstr_hashval(unconf->cl_recdir); 1665 conf = find_confirmed_client_by_str(unconf->cl_recdir, 1666 hash, false); 1667 if (conf) { 1668 nfsd4_remove_clid_dir(conf); 1669 expire_client(conf); 1670 } 1671 move_to_confirmed(unconf); 1672 conf = unconf; 1673 nfsd4_probe_callback(conf); 1674 status = nfs_ok; 1675 } 1676 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) 1677 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, 1678 &confirm)))) { 1679 /* 1680 * RFC 3530 14.2.34 CASE 4: 1681 * Client probably hasn't noticed that we rebooted yet. 1682 */ 1683 status = nfserr_stale_clientid; 1684 } else { 1685 /* check that we have hit one of the cases...*/ 1686 status = nfserr_clid_inuse; 1687 } 1688 out: 1689 nfs4_unlock_state(); 1690 return status; 1691 } 1692 1693 /* OPEN Share state helper functions */ 1694 static inline struct nfs4_file * 1695 alloc_init_file(struct inode *ino) 1696 { 1697 struct nfs4_file *fp; 1698 unsigned int hashval = file_hashval(ino); 1699 1700 fp = kmem_cache_alloc(file_slab, GFP_KERNEL); 1701 if (fp) { 1702 atomic_set(&fp->fi_ref, 1); 1703 INIT_LIST_HEAD(&fp->fi_hash); 1704 INIT_LIST_HEAD(&fp->fi_stateids); 1705 INIT_LIST_HEAD(&fp->fi_delegations); 1706 spin_lock(&recall_lock); 1707 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 1708 spin_unlock(&recall_lock); 1709 fp->fi_inode = igrab(ino); 1710 fp->fi_id = current_fileid++; 1711 fp->fi_had_conflict = false; 1712 return fp; 1713 } 1714 return NULL; 1715 } 1716 1717 static void 1718 nfsd4_free_slab(struct kmem_cache **slab) 1719 { 1720 if (*slab == NULL) 1721 return; 1722 kmem_cache_destroy(*slab); 1723 *slab = NULL; 1724 } 1725 1726 void 1727 nfsd4_free_slabs(void) 1728 { 1729 nfsd4_free_slab(&stateowner_slab); 1730 nfsd4_free_slab(&file_slab); 1731 nfsd4_free_slab(&stateid_slab); 1732 nfsd4_free_slab(&deleg_slab); 1733 } 1734 1735 static int 1736 nfsd4_init_slabs(void) 1737 { 1738 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 1739 sizeof(struct nfs4_stateowner), 0, 0, NULL); 1740 if (stateowner_slab == NULL) 1741 goto out_nomem; 1742 file_slab = kmem_cache_create("nfsd4_files", 1743 sizeof(struct nfs4_file), 0, 0, NULL); 1744 if (file_slab == NULL) 1745 goto out_nomem; 1746 stateid_slab = kmem_cache_create("nfsd4_stateids", 1747 sizeof(struct nfs4_stateid), 0, 0, NULL); 1748 if (stateid_slab == NULL) 1749 goto out_nomem; 1750 deleg_slab = kmem_cache_create("nfsd4_delegations", 1751 sizeof(struct nfs4_delegation), 0, 0, NULL); 1752 if (deleg_slab == NULL) 1753 goto out_nomem; 1754 return 0; 1755 out_nomem: 1756 nfsd4_free_slabs(); 1757 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 1758 return -ENOMEM; 1759 } 1760 1761 void 1762 nfs4_free_stateowner(struct kref *kref) 1763 { 1764 struct nfs4_stateowner *sop = 1765 container_of(kref, struct nfs4_stateowner, so_ref); 1766 kfree(sop->so_owner.data); 1767 kmem_cache_free(stateowner_slab, sop); 1768 } 1769 1770 static inline struct nfs4_stateowner * 1771 alloc_stateowner(struct xdr_netobj *owner) 1772 { 1773 struct nfs4_stateowner *sop; 1774 1775 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 1776 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 1777 memcpy(sop->so_owner.data, owner->data, owner->len); 1778 sop->so_owner.len = owner->len; 1779 kref_init(&sop->so_ref); 1780 return sop; 1781 } 1782 kmem_cache_free(stateowner_slab, sop); 1783 } 1784 return NULL; 1785 } 1786 1787 static struct nfs4_stateowner * 1788 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 1789 struct nfs4_stateowner *sop; 1790 struct nfs4_replay *rp; 1791 unsigned int idhashval; 1792 1793 if (!(sop = alloc_stateowner(&open->op_owner))) 1794 return NULL; 1795 idhashval = ownerid_hashval(current_ownerid); 1796 INIT_LIST_HEAD(&sop->so_idhash); 1797 INIT_LIST_HEAD(&sop->so_strhash); 1798 INIT_LIST_HEAD(&sop->so_perclient); 1799 INIT_LIST_HEAD(&sop->so_stateids); 1800 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ 1801 INIT_LIST_HEAD(&sop->so_close_lru); 1802 sop->so_time = 0; 1803 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 1804 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 1805 list_add(&sop->so_perclient, &clp->cl_openowners); 1806 sop->so_is_open_owner = 1; 1807 sop->so_id = current_ownerid++; 1808 sop->so_client = clp; 1809 sop->so_seqid = open->op_seqid; 1810 sop->so_confirmed = 0; 1811 rp = &sop->so_replay; 1812 rp->rp_status = nfserr_serverfault; 1813 rp->rp_buflen = 0; 1814 rp->rp_buf = rp->rp_ibuf; 1815 return sop; 1816 } 1817 1818 static inline void 1819 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 1820 struct nfs4_stateowner *sop = open->op_stateowner; 1821 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 1822 1823 INIT_LIST_HEAD(&stp->st_hash); 1824 INIT_LIST_HEAD(&stp->st_perstateowner); 1825 INIT_LIST_HEAD(&stp->st_lockowners); 1826 INIT_LIST_HEAD(&stp->st_perfile); 1827 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 1828 list_add(&stp->st_perstateowner, &sop->so_stateids); 1829 list_add(&stp->st_perfile, &fp->fi_stateids); 1830 stp->st_stateowner = sop; 1831 get_nfs4_file(fp); 1832 stp->st_file = fp; 1833 stp->st_stateid.si_boot = get_seconds(); 1834 stp->st_stateid.si_stateownerid = sop->so_id; 1835 stp->st_stateid.si_fileid = fp->fi_id; 1836 stp->st_stateid.si_generation = 0; 1837 stp->st_access_bmap = 0; 1838 stp->st_deny_bmap = 0; 1839 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK, 1840 &stp->st_access_bmap); 1841 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1842 stp->st_openstp = NULL; 1843 } 1844 1845 static void 1846 move_to_close_lru(struct nfs4_stateowner *sop) 1847 { 1848 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 1849 1850 list_move_tail(&sop->so_close_lru, &close_lru); 1851 sop->so_time = get_seconds(); 1852 } 1853 1854 static int 1855 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, 1856 clientid_t *clid) 1857 { 1858 return (sop->so_owner.len == owner->len) && 1859 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && 1860 (sop->so_client->cl_clientid.cl_id == clid->cl_id); 1861 } 1862 1863 static struct nfs4_stateowner * 1864 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) 1865 { 1866 struct nfs4_stateowner *so = NULL; 1867 1868 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { 1869 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) 1870 return so; 1871 } 1872 return NULL; 1873 } 1874 1875 /* search file_hashtbl[] for file */ 1876 static struct nfs4_file * 1877 find_file(struct inode *ino) 1878 { 1879 unsigned int hashval = file_hashval(ino); 1880 struct nfs4_file *fp; 1881 1882 spin_lock(&recall_lock); 1883 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { 1884 if (fp->fi_inode == ino) { 1885 get_nfs4_file(fp); 1886 spin_unlock(&recall_lock); 1887 return fp; 1888 } 1889 } 1890 spin_unlock(&recall_lock); 1891 return NULL; 1892 } 1893 1894 static inline int access_valid(u32 x, u32 minorversion) 1895 { 1896 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ) 1897 return 0; 1898 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH) 1899 return 0; 1900 x &= ~NFS4_SHARE_ACCESS_MASK; 1901 if (minorversion && x) { 1902 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL) 1903 return 0; 1904 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED) 1905 return 0; 1906 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK); 1907 } 1908 if (x) 1909 return 0; 1910 return 1; 1911 } 1912 1913 static inline int deny_valid(u32 x) 1914 { 1915 /* Note: unlike access bits, deny bits may be zero. */ 1916 return x <= NFS4_SHARE_DENY_BOTH; 1917 } 1918 1919 /* 1920 * We store the NONE, READ, WRITE, and BOTH bits separately in the 1921 * st_{access,deny}_bmap field of the stateid, in order to track not 1922 * only what share bits are currently in force, but also what 1923 * combinations of share bits previous opens have used. This allows us 1924 * to enforce the recommendation of rfc 3530 14.2.19 that the server 1925 * return an error if the client attempt to downgrade to a combination 1926 * of share bits not explicable by closing some of its previous opens. 1927 * 1928 * XXX: This enforcement is actually incomplete, since we don't keep 1929 * track of access/deny bit combinations; so, e.g., we allow: 1930 * 1931 * OPEN allow read, deny write 1932 * OPEN allow both, deny none 1933 * DOWNGRADE allow read, deny none 1934 * 1935 * which we should reject. 1936 */ 1937 static void 1938 set_access(unsigned int *access, unsigned long bmap) { 1939 int i; 1940 1941 *access = 0; 1942 for (i = 1; i < 4; i++) { 1943 if (test_bit(i, &bmap)) 1944 *access |= i; 1945 } 1946 } 1947 1948 static void 1949 set_deny(unsigned int *deny, unsigned long bmap) { 1950 int i; 1951 1952 *deny = 0; 1953 for (i = 0; i < 4; i++) { 1954 if (test_bit(i, &bmap)) 1955 *deny |= i ; 1956 } 1957 } 1958 1959 static int 1960 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 1961 unsigned int access, deny; 1962 1963 set_access(&access, stp->st_access_bmap); 1964 set_deny(&deny, stp->st_deny_bmap); 1965 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 1966 return 0; 1967 return 1; 1968 } 1969 1970 /* 1971 * Called to check deny when READ with all zero stateid or 1972 * WRITE with all zero or all one stateid 1973 */ 1974 static __be32 1975 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 1976 { 1977 struct inode *ino = current_fh->fh_dentry->d_inode; 1978 struct nfs4_file *fp; 1979 struct nfs4_stateid *stp; 1980 __be32 ret; 1981 1982 dprintk("NFSD: nfs4_share_conflict\n"); 1983 1984 fp = find_file(ino); 1985 if (!fp) 1986 return nfs_ok; 1987 ret = nfserr_locked; 1988 /* Search for conflicting share reservations */ 1989 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { 1990 if (test_bit(deny_type, &stp->st_deny_bmap) || 1991 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 1992 goto out; 1993 } 1994 ret = nfs_ok; 1995 out: 1996 put_nfs4_file(fp); 1997 return ret; 1998 } 1999 2000 static inline void 2001 nfs4_file_downgrade(struct file *filp, unsigned int share_access) 2002 { 2003 if (share_access & NFS4_SHARE_ACCESS_WRITE) { 2004 drop_file_write_access(filp); 2005 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; 2006 } 2007 } 2008 2009 /* 2010 * Spawn a thread to perform a recall on the delegation represented 2011 * by the lease (file_lock) 2012 * 2013 * Called from break_lease() with lock_kernel() held. 2014 * Note: we assume break_lease will only call this *once* for any given 2015 * lease. 2016 */ 2017 static 2018 void nfsd_break_deleg_cb(struct file_lock *fl) 2019 { 2020 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 2021 2022 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 2023 if (!dp) 2024 return; 2025 2026 /* We're assuming the state code never drops its reference 2027 * without first removing the lease. Since we're in this lease 2028 * callback (and since the lease code is serialized by the kernel 2029 * lock) we know the server hasn't removed the lease yet, we know 2030 * it's safe to take a reference: */ 2031 atomic_inc(&dp->dl_count); 2032 atomic_inc(&dp->dl_client->cl_count); 2033 2034 spin_lock(&recall_lock); 2035 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 2036 spin_unlock(&recall_lock); 2037 2038 /* only place dl_time is set. protected by lock_kernel*/ 2039 dp->dl_time = get_seconds(); 2040 2041 /* 2042 * We don't want the locks code to timeout the lease for us; 2043 * we'll remove it ourself if the delegation isn't returned 2044 * in time. 2045 */ 2046 fl->fl_break_time = 0; 2047 2048 dp->dl_file->fi_had_conflict = true; 2049 nfsd4_cb_recall(dp); 2050 } 2051 2052 /* 2053 * The file_lock is being reapd. 2054 * 2055 * Called by locks_free_lock() with lock_kernel() held. 2056 */ 2057 static 2058 void nfsd_release_deleg_cb(struct file_lock *fl) 2059 { 2060 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 2061 2062 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count)); 2063 2064 if (!(fl->fl_flags & FL_LEASE) || !dp) 2065 return; 2066 dp->dl_flock = NULL; 2067 } 2068 2069 /* 2070 * Set the delegation file_lock back pointer. 2071 * 2072 * Called from setlease() with lock_kernel() held. 2073 */ 2074 static 2075 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl) 2076 { 2077 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner; 2078 2079 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp); 2080 if (!dp) 2081 return; 2082 dp->dl_flock = new; 2083 } 2084 2085 /* 2086 * Called from setlease() with lock_kernel() held 2087 */ 2088 static 2089 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) 2090 { 2091 struct nfs4_delegation *onlistd = 2092 (struct nfs4_delegation *)onlist->fl_owner; 2093 struct nfs4_delegation *tryd = 2094 (struct nfs4_delegation *)try->fl_owner; 2095 2096 if (onlist->fl_lmops != try->fl_lmops) 2097 return 0; 2098 2099 return onlistd->dl_client == tryd->dl_client; 2100 } 2101 2102 2103 static 2104 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) 2105 { 2106 if (arg & F_UNLCK) 2107 return lease_modify(onlist, arg); 2108 else 2109 return -EAGAIN; 2110 } 2111 2112 static const struct lock_manager_operations nfsd_lease_mng_ops = { 2113 .fl_break = nfsd_break_deleg_cb, 2114 .fl_release_private = nfsd_release_deleg_cb, 2115 .fl_copy_lock = nfsd_copy_lock_deleg_cb, 2116 .fl_mylease = nfsd_same_client_deleg_cb, 2117 .fl_change = nfsd_change_deleg_cb, 2118 }; 2119 2120 2121 __be32 2122 nfsd4_process_open1(struct nfsd4_compound_state *cstate, 2123 struct nfsd4_open *open) 2124 { 2125 clientid_t *clientid = &open->op_clientid; 2126 struct nfs4_client *clp = NULL; 2127 unsigned int strhashval; 2128 struct nfs4_stateowner *sop = NULL; 2129 2130 if (!check_name(open->op_owner)) 2131 return nfserr_inval; 2132 2133 if (STALE_CLIENTID(&open->op_clientid)) 2134 return nfserr_stale_clientid; 2135 2136 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); 2137 sop = find_openstateowner_str(strhashval, open); 2138 open->op_stateowner = sop; 2139 if (!sop) { 2140 /* Make sure the client's lease hasn't expired. */ 2141 clp = find_confirmed_client(clientid); 2142 if (clp == NULL) 2143 return nfserr_expired; 2144 goto renew; 2145 } 2146 /* When sessions are used, skip open sequenceid processing */ 2147 if (nfsd4_has_session(cstate)) 2148 goto renew; 2149 if (!sop->so_confirmed) { 2150 /* Replace unconfirmed owners without checking for replay. */ 2151 clp = sop->so_client; 2152 release_openowner(sop); 2153 open->op_stateowner = NULL; 2154 goto renew; 2155 } 2156 if (open->op_seqid == sop->so_seqid - 1) { 2157 if (sop->so_replay.rp_buflen) 2158 return nfserr_replay_me; 2159 /* The original OPEN failed so spectacularly 2160 * that we don't even have replay data saved! 2161 * Therefore, we have no choice but to continue 2162 * processing this OPEN; presumably, we'll 2163 * fail again for the same reason. 2164 */ 2165 dprintk("nfsd4_process_open1: replay with no replay cache\n"); 2166 goto renew; 2167 } 2168 if (open->op_seqid != sop->so_seqid) 2169 return nfserr_bad_seqid; 2170 renew: 2171 if (open->op_stateowner == NULL) { 2172 sop = alloc_init_open_stateowner(strhashval, clp, open); 2173 if (sop == NULL) 2174 return nfserr_resource; 2175 open->op_stateowner = sop; 2176 } 2177 list_del_init(&sop->so_close_lru); 2178 renew_client(sop->so_client); 2179 return nfs_ok; 2180 } 2181 2182 static inline __be32 2183 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 2184 { 2185 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 2186 return nfserr_openmode; 2187 else 2188 return nfs_ok; 2189 } 2190 2191 static struct nfs4_delegation * 2192 find_delegation_file(struct nfs4_file *fp, stateid_t *stid) 2193 { 2194 struct nfs4_delegation *dp; 2195 2196 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) { 2197 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) 2198 return dp; 2199 } 2200 return NULL; 2201 } 2202 2203 static __be32 2204 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, 2205 struct nfs4_delegation **dp) 2206 { 2207 int flags; 2208 __be32 status = nfserr_bad_stateid; 2209 2210 *dp = find_delegation_file(fp, &open->op_delegate_stateid); 2211 if (*dp == NULL) 2212 goto out; 2213 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ? 2214 RD_STATE : WR_STATE; 2215 status = nfs4_check_delegmode(*dp, flags); 2216 if (status) 2217 *dp = NULL; 2218 out: 2219 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR) 2220 return nfs_ok; 2221 if (status) 2222 return status; 2223 open->op_stateowner->so_confirmed = 1; 2224 return nfs_ok; 2225 } 2226 2227 static __be32 2228 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 2229 { 2230 struct nfs4_stateid *local; 2231 __be32 status = nfserr_share_denied; 2232 struct nfs4_stateowner *sop = open->op_stateowner; 2233 2234 list_for_each_entry(local, &fp->fi_stateids, st_perfile) { 2235 /* ignore lock owners */ 2236 if (local->st_stateowner->so_is_open_owner == 0) 2237 continue; 2238 /* remember if we have seen this open owner */ 2239 if (local->st_stateowner == sop) 2240 *stpp = local; 2241 /* check for conflicting share reservations */ 2242 if (!test_share(local, open)) 2243 goto out; 2244 } 2245 status = 0; 2246 out: 2247 return status; 2248 } 2249 2250 static inline struct nfs4_stateid * 2251 nfs4_alloc_stateid(void) 2252 { 2253 return kmem_cache_alloc(stateid_slab, GFP_KERNEL); 2254 } 2255 2256 static __be32 2257 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, 2258 struct nfs4_delegation *dp, 2259 struct svc_fh *cur_fh, int flags) 2260 { 2261 struct nfs4_stateid *stp; 2262 2263 stp = nfs4_alloc_stateid(); 2264 if (stp == NULL) 2265 return nfserr_resource; 2266 2267 if (dp) { 2268 get_file(dp->dl_vfs_file); 2269 stp->st_vfs_file = dp->dl_vfs_file; 2270 } else { 2271 __be32 status; 2272 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, 2273 &stp->st_vfs_file); 2274 if (status) { 2275 if (status == nfserr_dropit) 2276 status = nfserr_jukebox; 2277 kmem_cache_free(stateid_slab, stp); 2278 return status; 2279 } 2280 } 2281 *stpp = stp; 2282 return 0; 2283 } 2284 2285 static inline __be32 2286 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 2287 struct nfsd4_open *open) 2288 { 2289 struct iattr iattr = { 2290 .ia_valid = ATTR_SIZE, 2291 .ia_size = 0, 2292 }; 2293 if (!open->op_truncate) 2294 return 0; 2295 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 2296 return nfserr_inval; 2297 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 2298 } 2299 2300 static __be32 2301 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) 2302 { 2303 struct file *filp = stp->st_vfs_file; 2304 struct inode *inode = filp->f_path.dentry->d_inode; 2305 unsigned int share_access, new_writer; 2306 __be32 status; 2307 2308 set_access(&share_access, stp->st_access_bmap); 2309 new_writer = (~share_access) & open->op_share_access 2310 & NFS4_SHARE_ACCESS_WRITE; 2311 2312 if (new_writer) { 2313 int err = get_write_access(inode); 2314 if (err) 2315 return nfserrno(err); 2316 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt); 2317 if (err) 2318 return nfserrno(err); 2319 file_take_write(filp); 2320 } 2321 status = nfsd4_truncate(rqstp, cur_fh, open); 2322 if (status) { 2323 if (new_writer) 2324 put_write_access(inode); 2325 return status; 2326 } 2327 /* remember the open */ 2328 filp->f_mode |= open->op_share_access; 2329 __set_bit(open->op_share_access, &stp->st_access_bmap); 2330 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 2331 2332 return nfs_ok; 2333 } 2334 2335 2336 static void 2337 nfs4_set_claim_prev(struct nfsd4_open *open) 2338 { 2339 open->op_stateowner->so_confirmed = 1; 2340 open->op_stateowner->so_client->cl_firststate = 1; 2341 } 2342 2343 /* 2344 * Attempt to hand out a delegation. 2345 */ 2346 static void 2347 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp) 2348 { 2349 struct nfs4_delegation *dp; 2350 struct nfs4_stateowner *sop = stp->st_stateowner; 2351 struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn; 2352 struct file_lock fl, *flp = &fl; 2353 int status, flag = 0; 2354 2355 flag = NFS4_OPEN_DELEGATE_NONE; 2356 open->op_recall = 0; 2357 switch (open->op_claim_type) { 2358 case NFS4_OPEN_CLAIM_PREVIOUS: 2359 if (!atomic_read(&cb->cb_set)) 2360 open->op_recall = 1; 2361 flag = open->op_delegate_type; 2362 if (flag == NFS4_OPEN_DELEGATE_NONE) 2363 goto out; 2364 break; 2365 case NFS4_OPEN_CLAIM_NULL: 2366 /* Let's not give out any delegations till everyone's 2367 * had the chance to reclaim theirs.... */ 2368 if (locks_in_grace()) 2369 goto out; 2370 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed) 2371 goto out; 2372 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 2373 flag = NFS4_OPEN_DELEGATE_WRITE; 2374 else 2375 flag = NFS4_OPEN_DELEGATE_READ; 2376 break; 2377 default: 2378 goto out; 2379 } 2380 2381 dp = alloc_init_deleg(sop->so_client, stp, fh, flag); 2382 if (dp == NULL) { 2383 flag = NFS4_OPEN_DELEGATE_NONE; 2384 goto out; 2385 } 2386 locks_init_lock(&fl); 2387 fl.fl_lmops = &nfsd_lease_mng_ops; 2388 fl.fl_flags = FL_LEASE; 2389 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; 2390 fl.fl_end = OFFSET_MAX; 2391 fl.fl_owner = (fl_owner_t)dp; 2392 fl.fl_file = stp->st_vfs_file; 2393 fl.fl_pid = current->tgid; 2394 2395 /* vfs_setlease checks to see if delegation should be handed out. 2396 * the lock_manager callbacks fl_mylease and fl_change are used 2397 */ 2398 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) { 2399 dprintk("NFSD: setlease failed [%d], no delegation\n", status); 2400 unhash_delegation(dp); 2401 flag = NFS4_OPEN_DELEGATE_NONE; 2402 goto out; 2403 } 2404 2405 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); 2406 2407 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n", 2408 dp->dl_stateid.si_boot, 2409 dp->dl_stateid.si_stateownerid, 2410 dp->dl_stateid.si_fileid, 2411 dp->dl_stateid.si_generation); 2412 out: 2413 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS 2414 && flag == NFS4_OPEN_DELEGATE_NONE 2415 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) 2416 dprintk("NFSD: WARNING: refusing delegation reclaim\n"); 2417 open->op_delegate_type = flag; 2418 } 2419 2420 /* 2421 * called with nfs4_lock_state() held. 2422 */ 2423 __be32 2424 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 2425 { 2426 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2427 struct nfs4_file *fp = NULL; 2428 struct inode *ino = current_fh->fh_dentry->d_inode; 2429 struct nfs4_stateid *stp = NULL; 2430 struct nfs4_delegation *dp = NULL; 2431 __be32 status; 2432 2433 status = nfserr_inval; 2434 if (!access_valid(open->op_share_access, resp->cstate.minorversion) 2435 || !deny_valid(open->op_share_deny)) 2436 goto out; 2437 /* 2438 * Lookup file; if found, lookup stateid and check open request, 2439 * and check for delegations in the process of being recalled. 2440 * If not found, create the nfs4_file struct 2441 */ 2442 fp = find_file(ino); 2443 if (fp) { 2444 if ((status = nfs4_check_open(fp, open, &stp))) 2445 goto out; 2446 status = nfs4_check_deleg(fp, open, &dp); 2447 if (status) 2448 goto out; 2449 } else { 2450 status = nfserr_bad_stateid; 2451 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) 2452 goto out; 2453 status = nfserr_resource; 2454 fp = alloc_init_file(ino); 2455 if (fp == NULL) 2456 goto out; 2457 } 2458 2459 /* 2460 * OPEN the file, or upgrade an existing OPEN. 2461 * If truncate fails, the OPEN fails. 2462 */ 2463 if (stp) { 2464 /* Stateid was found, this is an OPEN upgrade */ 2465 status = nfs4_upgrade_open(rqstp, current_fh, stp, open); 2466 if (status) 2467 goto out; 2468 update_stateid(&stp->st_stateid); 2469 } else { 2470 /* Stateid was not found, this is a new OPEN */ 2471 int flags = 0; 2472 if (open->op_share_access & NFS4_SHARE_ACCESS_READ) 2473 flags |= NFSD_MAY_READ; 2474 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 2475 flags |= NFSD_MAY_WRITE; 2476 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags); 2477 if (status) 2478 goto out; 2479 init_stateid(stp, fp, open); 2480 status = nfsd4_truncate(rqstp, current_fh, open); 2481 if (status) { 2482 release_open_stateid(stp); 2483 goto out; 2484 } 2485 if (nfsd4_has_session(&resp->cstate)) 2486 update_stateid(&stp->st_stateid); 2487 } 2488 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 2489 2490 if (nfsd4_has_session(&resp->cstate)) 2491 open->op_stateowner->so_confirmed = 1; 2492 2493 /* 2494 * Attempt to hand out a delegation. No error return, because the 2495 * OPEN succeeds even if we fail. 2496 */ 2497 nfs4_open_delegation(current_fh, open, stp); 2498 2499 status = nfs_ok; 2500 2501 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n", 2502 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid, 2503 stp->st_stateid.si_fileid, stp->st_stateid.si_generation); 2504 out: 2505 if (fp) 2506 put_nfs4_file(fp); 2507 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 2508 nfs4_set_claim_prev(open); 2509 /* 2510 * To finish the open response, we just need to set the rflags. 2511 */ 2512 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 2513 if (!open->op_stateowner->so_confirmed && 2514 !nfsd4_has_session(&resp->cstate)) 2515 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 2516 2517 return status; 2518 } 2519 2520 __be32 2521 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2522 clientid_t *clid) 2523 { 2524 struct nfs4_client *clp; 2525 __be32 status; 2526 2527 nfs4_lock_state(); 2528 dprintk("process_renew(%08x/%08x): starting\n", 2529 clid->cl_boot, clid->cl_id); 2530 status = nfserr_stale_clientid; 2531 if (STALE_CLIENTID(clid)) 2532 goto out; 2533 clp = find_confirmed_client(clid); 2534 status = nfserr_expired; 2535 if (clp == NULL) { 2536 /* We assume the client took too long to RENEW. */ 2537 dprintk("nfsd4_renew: clientid not found!\n"); 2538 goto out; 2539 } 2540 renew_client(clp); 2541 status = nfserr_cb_path_down; 2542 if (!list_empty(&clp->cl_delegations) 2543 && !atomic_read(&clp->cl_cb_conn.cb_set)) 2544 goto out; 2545 status = nfs_ok; 2546 out: 2547 nfs4_unlock_state(); 2548 return status; 2549 } 2550 2551 struct lock_manager nfsd4_manager = { 2552 }; 2553 2554 static void 2555 nfsd4_end_grace(void) 2556 { 2557 dprintk("NFSD: end of grace period\n"); 2558 nfsd4_recdir_purge_old(); 2559 locks_end_grace(&nfsd4_manager); 2560 } 2561 2562 static time_t 2563 nfs4_laundromat(void) 2564 { 2565 struct nfs4_client *clp; 2566 struct nfs4_stateowner *sop; 2567 struct nfs4_delegation *dp; 2568 struct list_head *pos, *next, reaplist; 2569 time_t cutoff = get_seconds() - NFSD_LEASE_TIME; 2570 time_t t, clientid_val = NFSD_LEASE_TIME; 2571 time_t u, test_val = NFSD_LEASE_TIME; 2572 2573 nfs4_lock_state(); 2574 2575 dprintk("NFSD: laundromat service - starting\n"); 2576 if (locks_in_grace()) 2577 nfsd4_end_grace(); 2578 list_for_each_safe(pos, next, &client_lru) { 2579 clp = list_entry(pos, struct nfs4_client, cl_lru); 2580 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 2581 t = clp->cl_time - cutoff; 2582 if (clientid_val > t) 2583 clientid_val = t; 2584 break; 2585 } 2586 dprintk("NFSD: purging unused client (clientid %08x)\n", 2587 clp->cl_clientid.cl_id); 2588 nfsd4_remove_clid_dir(clp); 2589 expire_client(clp); 2590 } 2591 INIT_LIST_HEAD(&reaplist); 2592 spin_lock(&recall_lock); 2593 list_for_each_safe(pos, next, &del_recall_lru) { 2594 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 2595 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 2596 u = dp->dl_time - cutoff; 2597 if (test_val > u) 2598 test_val = u; 2599 break; 2600 } 2601 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 2602 dp, dp->dl_flock); 2603 list_move(&dp->dl_recall_lru, &reaplist); 2604 } 2605 spin_unlock(&recall_lock); 2606 list_for_each_safe(pos, next, &reaplist) { 2607 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 2608 list_del_init(&dp->dl_recall_lru); 2609 unhash_delegation(dp); 2610 } 2611 test_val = NFSD_LEASE_TIME; 2612 list_for_each_safe(pos, next, &close_lru) { 2613 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 2614 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 2615 u = sop->so_time - cutoff; 2616 if (test_val > u) 2617 test_val = u; 2618 break; 2619 } 2620 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 2621 sop->so_id); 2622 release_openowner(sop); 2623 } 2624 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 2625 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 2626 nfs4_unlock_state(); 2627 return clientid_val; 2628 } 2629 2630 static struct workqueue_struct *laundry_wq; 2631 static void laundromat_main(struct work_struct *); 2632 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); 2633 2634 static void 2635 laundromat_main(struct work_struct *not_used) 2636 { 2637 time_t t; 2638 2639 t = nfs4_laundromat(); 2640 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 2641 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); 2642 } 2643 2644 static struct nfs4_stateowner * 2645 search_close_lru(u32 st_id, int flags) 2646 { 2647 struct nfs4_stateowner *local = NULL; 2648 2649 if (flags & CLOSE_STATE) { 2650 list_for_each_entry(local, &close_lru, so_close_lru) { 2651 if (local->so_id == st_id) 2652 return local; 2653 } 2654 } 2655 return NULL; 2656 } 2657 2658 static inline int 2659 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 2660 { 2661 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode; 2662 } 2663 2664 static int 2665 STALE_STATEID(stateid_t *stateid) 2666 { 2667 if (time_after((unsigned long)boot_time, 2668 (unsigned long)stateid->si_boot)) { 2669 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n", 2670 stateid->si_boot, stateid->si_stateownerid, 2671 stateid->si_fileid, stateid->si_generation); 2672 return 1; 2673 } 2674 return 0; 2675 } 2676 2677 static int 2678 EXPIRED_STATEID(stateid_t *stateid) 2679 { 2680 if (time_before((unsigned long)boot_time, 2681 ((unsigned long)stateid->si_boot)) && 2682 time_before((unsigned long)(stateid->si_boot + lease_time), get_seconds())) { 2683 dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n", 2684 stateid->si_boot, stateid->si_stateownerid, 2685 stateid->si_fileid, stateid->si_generation); 2686 return 1; 2687 } 2688 return 0; 2689 } 2690 2691 static __be32 2692 stateid_error_map(stateid_t *stateid) 2693 { 2694 if (STALE_STATEID(stateid)) 2695 return nfserr_stale_stateid; 2696 if (EXPIRED_STATEID(stateid)) 2697 return nfserr_expired; 2698 2699 dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n", 2700 stateid->si_boot, stateid->si_stateownerid, 2701 stateid->si_fileid, stateid->si_generation); 2702 return nfserr_bad_stateid; 2703 } 2704 2705 static inline int 2706 access_permit_read(unsigned long access_bmap) 2707 { 2708 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 2709 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 2710 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 2711 } 2712 2713 static inline int 2714 access_permit_write(unsigned long access_bmap) 2715 { 2716 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 2717 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 2718 } 2719 2720 static 2721 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 2722 { 2723 __be32 status = nfserr_openmode; 2724 2725 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 2726 goto out; 2727 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 2728 goto out; 2729 status = nfs_ok; 2730 out: 2731 return status; 2732 } 2733 2734 static inline __be32 2735 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 2736 { 2737 if (ONE_STATEID(stateid) && (flags & RD_STATE)) 2738 return nfs_ok; 2739 else if (locks_in_grace()) { 2740 /* Answer in remaining cases depends on existance of 2741 * conflicting state; so we must wait out the grace period. */ 2742 return nfserr_grace; 2743 } else if (flags & WR_STATE) 2744 return nfs4_share_conflict(current_fh, 2745 NFS4_SHARE_DENY_WRITE); 2746 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 2747 return nfs4_share_conflict(current_fh, 2748 NFS4_SHARE_DENY_READ); 2749 } 2750 2751 /* 2752 * Allow READ/WRITE during grace period on recovered state only for files 2753 * that are not able to provide mandatory locking. 2754 */ 2755 static inline int 2756 grace_disallows_io(struct inode *inode) 2757 { 2758 return locks_in_grace() && mandatory_lock(inode); 2759 } 2760 2761 static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags) 2762 { 2763 /* 2764 * When sessions are used the stateid generation number is ignored 2765 * when it is zero. 2766 */ 2767 if ((flags & HAS_SESSION) && in->si_generation == 0) 2768 goto out; 2769 2770 /* If the client sends us a stateid from the future, it's buggy: */ 2771 if (in->si_generation > ref->si_generation) 2772 return nfserr_bad_stateid; 2773 /* 2774 * The following, however, can happen. For example, if the 2775 * client sends an open and some IO at the same time, the open 2776 * may bump si_generation while the IO is still in flight. 2777 * Thanks to hard links and renames, the client never knows what 2778 * file an open will affect. So it could avoid that situation 2779 * only by serializing all opens and IO from the same open 2780 * owner. To recover from the old_stateid error, the client 2781 * will just have to retry the IO: 2782 */ 2783 if (in->si_generation < ref->si_generation) 2784 return nfserr_old_stateid; 2785 out: 2786 return nfs_ok; 2787 } 2788 2789 static int is_delegation_stateid(stateid_t *stateid) 2790 { 2791 return stateid->si_fileid == 0; 2792 } 2793 2794 /* 2795 * Checks for stateid operations 2796 */ 2797 __be32 2798 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate, 2799 stateid_t *stateid, int flags, struct file **filpp) 2800 { 2801 struct nfs4_stateid *stp = NULL; 2802 struct nfs4_delegation *dp = NULL; 2803 struct svc_fh *current_fh = &cstate->current_fh; 2804 struct inode *ino = current_fh->fh_dentry->d_inode; 2805 __be32 status; 2806 2807 if (filpp) 2808 *filpp = NULL; 2809 2810 if (grace_disallows_io(ino)) 2811 return nfserr_grace; 2812 2813 if (nfsd4_has_session(cstate)) 2814 flags |= HAS_SESSION; 2815 2816 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2817 return check_special_stateids(current_fh, stateid, flags); 2818 2819 status = nfserr_stale_stateid; 2820 if (STALE_STATEID(stateid)) 2821 goto out; 2822 2823 status = nfserr_bad_stateid; 2824 if (is_delegation_stateid(stateid)) { 2825 dp = find_delegation_stateid(ino, stateid); 2826 if (!dp) { 2827 status = stateid_error_map(stateid); 2828 goto out; 2829 } 2830 status = check_stateid_generation(stateid, &dp->dl_stateid, 2831 flags); 2832 if (status) 2833 goto out; 2834 status = nfs4_check_delegmode(dp, flags); 2835 if (status) 2836 goto out; 2837 renew_client(dp->dl_client); 2838 if (filpp) 2839 *filpp = dp->dl_vfs_file; 2840 } else { /* open or lock stateid */ 2841 stp = find_stateid(stateid, flags); 2842 if (!stp) { 2843 status = stateid_error_map(stateid); 2844 goto out; 2845 } 2846 if (nfs4_check_fh(current_fh, stp)) 2847 goto out; 2848 if (!stp->st_stateowner->so_confirmed) 2849 goto out; 2850 status = check_stateid_generation(stateid, &stp->st_stateid, 2851 flags); 2852 if (status) 2853 goto out; 2854 status = nfs4_check_openmode(stp, flags); 2855 if (status) 2856 goto out; 2857 renew_client(stp->st_stateowner->so_client); 2858 if (filpp) 2859 *filpp = stp->st_vfs_file; 2860 } 2861 status = nfs_ok; 2862 out: 2863 return status; 2864 } 2865 2866 static inline int 2867 setlkflg (int type) 2868 { 2869 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 2870 RD_STATE : WR_STATE; 2871 } 2872 2873 /* 2874 * Checks for sequence id mutating operations. 2875 */ 2876 static __be32 2877 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, 2878 stateid_t *stateid, int flags, 2879 struct nfs4_stateowner **sopp, 2880 struct nfs4_stateid **stpp, struct nfsd4_lock *lock) 2881 { 2882 struct nfs4_stateid *stp; 2883 struct nfs4_stateowner *sop; 2884 struct svc_fh *current_fh = &cstate->current_fh; 2885 __be32 status; 2886 2887 dprintk("NFSD: preprocess_seqid_op: seqid=%d " 2888 "stateid = (%08x/%08x/%08x/%08x)\n", seqid, 2889 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, 2890 stateid->si_generation); 2891 2892 *stpp = NULL; 2893 *sopp = NULL; 2894 2895 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 2896 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n"); 2897 return nfserr_bad_stateid; 2898 } 2899 2900 if (STALE_STATEID(stateid)) 2901 return nfserr_stale_stateid; 2902 2903 if (nfsd4_has_session(cstate)) 2904 flags |= HAS_SESSION; 2905 2906 /* 2907 * We return BAD_STATEID if filehandle doesn't match stateid, 2908 * the confirmed flag is incorrecly set, or the generation 2909 * number is incorrect. 2910 */ 2911 stp = find_stateid(stateid, flags); 2912 if (stp == NULL) { 2913 /* 2914 * Also, we should make sure this isn't just the result of 2915 * a replayed close: 2916 */ 2917 sop = search_close_lru(stateid->si_stateownerid, flags); 2918 if (sop == NULL) 2919 return stateid_error_map(stateid); 2920 *sopp = sop; 2921 goto check_replay; 2922 } 2923 2924 *stpp = stp; 2925 *sopp = sop = stp->st_stateowner; 2926 2927 if (lock) { 2928 clientid_t *lockclid = &lock->v.new.clientid; 2929 struct nfs4_client *clp = sop->so_client; 2930 int lkflg = 0; 2931 __be32 status; 2932 2933 lkflg = setlkflg(lock->lk_type); 2934 2935 if (lock->lk_is_new) { 2936 if (!sop->so_is_open_owner) 2937 return nfserr_bad_stateid; 2938 if (!(flags & HAS_SESSION) && 2939 !same_clid(&clp->cl_clientid, lockclid)) 2940 return nfserr_bad_stateid; 2941 /* stp is the open stateid */ 2942 status = nfs4_check_openmode(stp, lkflg); 2943 if (status) 2944 return status; 2945 } else { 2946 /* stp is the lock stateid */ 2947 status = nfs4_check_openmode(stp->st_openstp, lkflg); 2948 if (status) 2949 return status; 2950 } 2951 } 2952 2953 if (nfs4_check_fh(current_fh, stp)) { 2954 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 2955 return nfserr_bad_stateid; 2956 } 2957 2958 /* 2959 * We now validate the seqid and stateid generation numbers. 2960 * For the moment, we ignore the possibility of 2961 * generation number wraparound. 2962 */ 2963 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid) 2964 goto check_replay; 2965 2966 if (sop->so_confirmed && flags & CONFIRM) { 2967 dprintk("NFSD: preprocess_seqid_op: expected" 2968 " unconfirmed stateowner!\n"); 2969 return nfserr_bad_stateid; 2970 } 2971 if (!sop->so_confirmed && !(flags & CONFIRM)) { 2972 dprintk("NFSD: preprocess_seqid_op: stateowner not" 2973 " confirmed yet!\n"); 2974 return nfserr_bad_stateid; 2975 } 2976 status = check_stateid_generation(stateid, &stp->st_stateid, flags); 2977 if (status) 2978 return status; 2979 renew_client(sop->so_client); 2980 return nfs_ok; 2981 2982 check_replay: 2983 if (seqid == sop->so_seqid - 1) { 2984 dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); 2985 /* indicate replay to calling function */ 2986 return nfserr_replay_me; 2987 } 2988 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", 2989 sop->so_seqid, seqid); 2990 *sopp = NULL; 2991 return nfserr_bad_seqid; 2992 } 2993 2994 __be32 2995 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2996 struct nfsd4_open_confirm *oc) 2997 { 2998 __be32 status; 2999 struct nfs4_stateowner *sop; 3000 struct nfs4_stateid *stp; 3001 3002 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 3003 (int)cstate->current_fh.fh_dentry->d_name.len, 3004 cstate->current_fh.fh_dentry->d_name.name); 3005 3006 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); 3007 if (status) 3008 return status; 3009 3010 nfs4_lock_state(); 3011 3012 if ((status = nfs4_preprocess_seqid_op(cstate, 3013 oc->oc_seqid, &oc->oc_req_stateid, 3014 CONFIRM | OPEN_STATE, 3015 &oc->oc_stateowner, &stp, NULL))) 3016 goto out; 3017 3018 sop = oc->oc_stateowner; 3019 sop->so_confirmed = 1; 3020 update_stateid(&stp->st_stateid); 3021 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 3022 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 3023 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid, 3024 stp->st_stateid.si_boot, 3025 stp->st_stateid.si_stateownerid, 3026 stp->st_stateid.si_fileid, 3027 stp->st_stateid.si_generation); 3028 3029 nfsd4_create_clid_dir(sop->so_client); 3030 out: 3031 if (oc->oc_stateowner) { 3032 nfs4_get_stateowner(oc->oc_stateowner); 3033 cstate->replay_owner = oc->oc_stateowner; 3034 } 3035 nfs4_unlock_state(); 3036 return status; 3037 } 3038 3039 3040 /* 3041 * unset all bits in union bitmap (bmap) that 3042 * do not exist in share (from successful OPEN_DOWNGRADE) 3043 */ 3044 static void 3045 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 3046 { 3047 int i; 3048 for (i = 1; i < 4; i++) { 3049 if ((i & access) != i) 3050 __clear_bit(i, bmap); 3051 } 3052 } 3053 3054 static void 3055 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 3056 { 3057 int i; 3058 for (i = 0; i < 4; i++) { 3059 if ((i & deny) != i) 3060 __clear_bit(i, bmap); 3061 } 3062 } 3063 3064 __be32 3065 nfsd4_open_downgrade(struct svc_rqst *rqstp, 3066 struct nfsd4_compound_state *cstate, 3067 struct nfsd4_open_downgrade *od) 3068 { 3069 __be32 status; 3070 struct nfs4_stateid *stp; 3071 unsigned int share_access; 3072 3073 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 3074 (int)cstate->current_fh.fh_dentry->d_name.len, 3075 cstate->current_fh.fh_dentry->d_name.name); 3076 3077 if (!access_valid(od->od_share_access, cstate->minorversion) 3078 || !deny_valid(od->od_share_deny)) 3079 return nfserr_inval; 3080 3081 nfs4_lock_state(); 3082 if ((status = nfs4_preprocess_seqid_op(cstate, 3083 od->od_seqid, 3084 &od->od_stateid, 3085 OPEN_STATE, 3086 &od->od_stateowner, &stp, NULL))) 3087 goto out; 3088 3089 status = nfserr_inval; 3090 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 3091 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 3092 stp->st_access_bmap, od->od_share_access); 3093 goto out; 3094 } 3095 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 3096 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 3097 stp->st_deny_bmap, od->od_share_deny); 3098 goto out; 3099 } 3100 set_access(&share_access, stp->st_access_bmap); 3101 nfs4_file_downgrade(stp->st_vfs_file, 3102 share_access & ~od->od_share_access); 3103 3104 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 3105 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 3106 3107 update_stateid(&stp->st_stateid); 3108 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 3109 status = nfs_ok; 3110 out: 3111 if (od->od_stateowner) { 3112 nfs4_get_stateowner(od->od_stateowner); 3113 cstate->replay_owner = od->od_stateowner; 3114 } 3115 nfs4_unlock_state(); 3116 return status; 3117 } 3118 3119 /* 3120 * nfs4_unlock_state() called after encode 3121 */ 3122 __be32 3123 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3124 struct nfsd4_close *close) 3125 { 3126 __be32 status; 3127 struct nfs4_stateid *stp; 3128 3129 dprintk("NFSD: nfsd4_close on file %.*s\n", 3130 (int)cstate->current_fh.fh_dentry->d_name.len, 3131 cstate->current_fh.fh_dentry->d_name.name); 3132 3133 nfs4_lock_state(); 3134 /* check close_lru for replay */ 3135 if ((status = nfs4_preprocess_seqid_op(cstate, 3136 close->cl_seqid, 3137 &close->cl_stateid, 3138 OPEN_STATE | CLOSE_STATE, 3139 &close->cl_stateowner, &stp, NULL))) 3140 goto out; 3141 status = nfs_ok; 3142 update_stateid(&stp->st_stateid); 3143 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 3144 3145 /* release_stateid() calls nfsd_close() if needed */ 3146 release_open_stateid(stp); 3147 3148 /* place unused nfs4_stateowners on so_close_lru list to be 3149 * released by the laundromat service after the lease period 3150 * to enable us to handle CLOSE replay 3151 */ 3152 if (list_empty(&close->cl_stateowner->so_stateids)) 3153 move_to_close_lru(close->cl_stateowner); 3154 out: 3155 if (close->cl_stateowner) { 3156 nfs4_get_stateowner(close->cl_stateowner); 3157 cstate->replay_owner = close->cl_stateowner; 3158 } 3159 nfs4_unlock_state(); 3160 return status; 3161 } 3162 3163 __be32 3164 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3165 struct nfsd4_delegreturn *dr) 3166 { 3167 struct nfs4_delegation *dp; 3168 stateid_t *stateid = &dr->dr_stateid; 3169 struct inode *inode; 3170 __be32 status; 3171 int flags = 0; 3172 3173 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 3174 return status; 3175 inode = cstate->current_fh.fh_dentry->d_inode; 3176 3177 if (nfsd4_has_session(cstate)) 3178 flags |= HAS_SESSION; 3179 nfs4_lock_state(); 3180 status = nfserr_bad_stateid; 3181 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 3182 goto out; 3183 status = nfserr_stale_stateid; 3184 if (STALE_STATEID(stateid)) 3185 goto out; 3186 status = nfserr_bad_stateid; 3187 if (!is_delegation_stateid(stateid)) 3188 goto out; 3189 dp = find_delegation_stateid(inode, stateid); 3190 if (!dp) { 3191 status = stateid_error_map(stateid); 3192 goto out; 3193 } 3194 status = check_stateid_generation(stateid, &dp->dl_stateid, flags); 3195 if (status) 3196 goto out; 3197 renew_client(dp->dl_client); 3198 3199 unhash_delegation(dp); 3200 out: 3201 nfs4_unlock_state(); 3202 3203 return status; 3204 } 3205 3206 3207 /* 3208 * Lock owner state (byte-range locks) 3209 */ 3210 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 3211 #define LOCK_HASH_BITS 8 3212 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 3213 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 3214 3215 static inline u64 3216 end_offset(u64 start, u64 len) 3217 { 3218 u64 end; 3219 3220 end = start + len; 3221 return end >= start ? end: NFS4_MAX_UINT64; 3222 } 3223 3224 /* last octet in a range */ 3225 static inline u64 3226 last_byte_offset(u64 start, u64 len) 3227 { 3228 u64 end; 3229 3230 BUG_ON(!len); 3231 end = start + len; 3232 return end > start ? end - 1: NFS4_MAX_UINT64; 3233 } 3234 3235 #define lockownerid_hashval(id) \ 3236 ((id) & LOCK_HASH_MASK) 3237 3238 static inline unsigned int 3239 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 3240 struct xdr_netobj *ownername) 3241 { 3242 return (file_hashval(inode) + cl_id 3243 + opaque_hashval(ownername->data, ownername->len)) 3244 & LOCK_HASH_MASK; 3245 } 3246 3247 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 3248 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 3249 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 3250 3251 static struct nfs4_stateid * 3252 find_stateid(stateid_t *stid, int flags) 3253 { 3254 struct nfs4_stateid *local; 3255 u32 st_id = stid->si_stateownerid; 3256 u32 f_id = stid->si_fileid; 3257 unsigned int hashval; 3258 3259 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 3260 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) { 3261 hashval = stateid_hashval(st_id, f_id); 3262 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 3263 if ((local->st_stateid.si_stateownerid == st_id) && 3264 (local->st_stateid.si_fileid == f_id)) 3265 return local; 3266 } 3267 } 3268 3269 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) { 3270 hashval = stateid_hashval(st_id, f_id); 3271 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 3272 if ((local->st_stateid.si_stateownerid == st_id) && 3273 (local->st_stateid.si_fileid == f_id)) 3274 return local; 3275 } 3276 } 3277 return NULL; 3278 } 3279 3280 static struct nfs4_delegation * 3281 find_delegation_stateid(struct inode *ino, stateid_t *stid) 3282 { 3283 struct nfs4_file *fp; 3284 struct nfs4_delegation *dl; 3285 3286 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n", 3287 stid->si_boot, stid->si_stateownerid, 3288 stid->si_fileid, stid->si_generation); 3289 3290 fp = find_file(ino); 3291 if (!fp) 3292 return NULL; 3293 dl = find_delegation_file(fp, stid); 3294 put_nfs4_file(fp); 3295 return dl; 3296 } 3297 3298 /* 3299 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 3300 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 3301 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 3302 * locking, this prevents us from being completely protocol-compliant. The 3303 * real solution to this problem is to start using unsigned file offsets in 3304 * the VFS, but this is a very deep change! 3305 */ 3306 static inline void 3307 nfs4_transform_lock_offset(struct file_lock *lock) 3308 { 3309 if (lock->fl_start < 0) 3310 lock->fl_start = OFFSET_MAX; 3311 if (lock->fl_end < 0) 3312 lock->fl_end = OFFSET_MAX; 3313 } 3314 3315 /* Hack!: For now, we're defining this just so we can use a pointer to it 3316 * as a unique cookie to identify our (NFSv4's) posix locks. */ 3317 static const struct lock_manager_operations nfsd_posix_mng_ops = { 3318 }; 3319 3320 static inline void 3321 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 3322 { 3323 struct nfs4_stateowner *sop; 3324 unsigned int hval; 3325 3326 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 3327 sop = (struct nfs4_stateowner *) fl->fl_owner; 3328 hval = lockownerid_hashval(sop->so_id); 3329 kref_get(&sop->so_ref); 3330 deny->ld_sop = sop; 3331 deny->ld_clientid = sop->so_client->cl_clientid; 3332 } else { 3333 deny->ld_sop = NULL; 3334 deny->ld_clientid.cl_boot = 0; 3335 deny->ld_clientid.cl_id = 0; 3336 } 3337 deny->ld_start = fl->fl_start; 3338 deny->ld_length = NFS4_MAX_UINT64; 3339 if (fl->fl_end != NFS4_MAX_UINT64) 3340 deny->ld_length = fl->fl_end - fl->fl_start + 1; 3341 deny->ld_type = NFS4_READ_LT; 3342 if (fl->fl_type != F_RDLCK) 3343 deny->ld_type = NFS4_WRITE_LT; 3344 } 3345 3346 static struct nfs4_stateowner * 3347 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 3348 struct xdr_netobj *owner) 3349 { 3350 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 3351 struct nfs4_stateowner *op; 3352 3353 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 3354 if (same_owner_str(op, owner, clid)) 3355 return op; 3356 } 3357 return NULL; 3358 } 3359 3360 /* 3361 * Alloc a lock owner structure. 3362 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 3363 * occured. 3364 * 3365 * strhashval = lock_ownerstr_hashval 3366 */ 3367 3368 static struct nfs4_stateowner * 3369 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 3370 struct nfs4_stateowner *sop; 3371 struct nfs4_replay *rp; 3372 unsigned int idhashval; 3373 3374 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 3375 return NULL; 3376 idhashval = lockownerid_hashval(current_ownerid); 3377 INIT_LIST_HEAD(&sop->so_idhash); 3378 INIT_LIST_HEAD(&sop->so_strhash); 3379 INIT_LIST_HEAD(&sop->so_perclient); 3380 INIT_LIST_HEAD(&sop->so_stateids); 3381 INIT_LIST_HEAD(&sop->so_perstateid); 3382 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 3383 sop->so_time = 0; 3384 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 3385 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 3386 list_add(&sop->so_perstateid, &open_stp->st_lockowners); 3387 sop->so_is_open_owner = 0; 3388 sop->so_id = current_ownerid++; 3389 sop->so_client = clp; 3390 /* It is the openowner seqid that will be incremented in encode in the 3391 * case of new lockowners; so increment the lock seqid manually: */ 3392 sop->so_seqid = lock->lk_new_lock_seqid + 1; 3393 sop->so_confirmed = 1; 3394 rp = &sop->so_replay; 3395 rp->rp_status = nfserr_serverfault; 3396 rp->rp_buflen = 0; 3397 rp->rp_buf = rp->rp_ibuf; 3398 return sop; 3399 } 3400 3401 static struct nfs4_stateid * 3402 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 3403 { 3404 struct nfs4_stateid *stp; 3405 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 3406 3407 stp = nfs4_alloc_stateid(); 3408 if (stp == NULL) 3409 goto out; 3410 INIT_LIST_HEAD(&stp->st_hash); 3411 INIT_LIST_HEAD(&stp->st_perfile); 3412 INIT_LIST_HEAD(&stp->st_perstateowner); 3413 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ 3414 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 3415 list_add(&stp->st_perfile, &fp->fi_stateids); 3416 list_add(&stp->st_perstateowner, &sop->so_stateids); 3417 stp->st_stateowner = sop; 3418 get_nfs4_file(fp); 3419 stp->st_file = fp; 3420 stp->st_stateid.si_boot = get_seconds(); 3421 stp->st_stateid.si_stateownerid = sop->so_id; 3422 stp->st_stateid.si_fileid = fp->fi_id; 3423 stp->st_stateid.si_generation = 0; 3424 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */ 3425 stp->st_access_bmap = open_stp->st_access_bmap; 3426 stp->st_deny_bmap = open_stp->st_deny_bmap; 3427 stp->st_openstp = open_stp; 3428 3429 out: 3430 return stp; 3431 } 3432 3433 static int 3434 check_lock_length(u64 offset, u64 length) 3435 { 3436 return ((length == 0) || ((length != NFS4_MAX_UINT64) && 3437 LOFF_OVERFLOW(offset, length))); 3438 } 3439 3440 /* 3441 * LOCK operation 3442 */ 3443 __be32 3444 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3445 struct nfsd4_lock *lock) 3446 { 3447 struct nfs4_stateowner *open_sop = NULL; 3448 struct nfs4_stateowner *lock_sop = NULL; 3449 struct nfs4_stateid *lock_stp; 3450 struct file *filp; 3451 struct file_lock file_lock; 3452 struct file_lock conflock; 3453 __be32 status = 0; 3454 unsigned int strhashval; 3455 unsigned int cmd; 3456 int err; 3457 3458 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 3459 (long long) lock->lk_offset, 3460 (long long) lock->lk_length); 3461 3462 if (check_lock_length(lock->lk_offset, lock->lk_length)) 3463 return nfserr_inval; 3464 3465 if ((status = fh_verify(rqstp, &cstate->current_fh, 3466 S_IFREG, NFSD_MAY_LOCK))) { 3467 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 3468 return status; 3469 } 3470 3471 nfs4_lock_state(); 3472 3473 if (lock->lk_is_new) { 3474 /* 3475 * Client indicates that this is a new lockowner. 3476 * Use open owner and open stateid to create lock owner and 3477 * lock stateid. 3478 */ 3479 struct nfs4_stateid *open_stp = NULL; 3480 struct nfs4_file *fp; 3481 3482 status = nfserr_stale_clientid; 3483 if (!nfsd4_has_session(cstate) && 3484 STALE_CLIENTID(&lock->lk_new_clientid)) 3485 goto out; 3486 3487 /* validate and update open stateid and open seqid */ 3488 status = nfs4_preprocess_seqid_op(cstate, 3489 lock->lk_new_open_seqid, 3490 &lock->lk_new_open_stateid, 3491 OPEN_STATE, 3492 &lock->lk_replay_owner, &open_stp, 3493 lock); 3494 if (status) 3495 goto out; 3496 open_sop = lock->lk_replay_owner; 3497 /* create lockowner and lock stateid */ 3498 fp = open_stp->st_file; 3499 strhashval = lock_ownerstr_hashval(fp->fi_inode, 3500 open_sop->so_client->cl_clientid.cl_id, 3501 &lock->v.new.owner); 3502 /* XXX: Do we need to check for duplicate stateowners on 3503 * the same file, or should they just be allowed (and 3504 * create new stateids)? */ 3505 status = nfserr_resource; 3506 lock_sop = alloc_init_lock_stateowner(strhashval, 3507 open_sop->so_client, open_stp, lock); 3508 if (lock_sop == NULL) 3509 goto out; 3510 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); 3511 if (lock_stp == NULL) 3512 goto out; 3513 } else { 3514 /* lock (lock owner + lock stateid) already exists */ 3515 status = nfs4_preprocess_seqid_op(cstate, 3516 lock->lk_old_lock_seqid, 3517 &lock->lk_old_lock_stateid, 3518 LOCK_STATE, 3519 &lock->lk_replay_owner, &lock_stp, lock); 3520 if (status) 3521 goto out; 3522 lock_sop = lock->lk_replay_owner; 3523 } 3524 /* lock->lk_replay_owner and lock_stp have been created or found */ 3525 filp = lock_stp->st_vfs_file; 3526 3527 status = nfserr_grace; 3528 if (locks_in_grace() && !lock->lk_reclaim) 3529 goto out; 3530 status = nfserr_no_grace; 3531 if (!locks_in_grace() && lock->lk_reclaim) 3532 goto out; 3533 3534 locks_init_lock(&file_lock); 3535 switch (lock->lk_type) { 3536 case NFS4_READ_LT: 3537 case NFS4_READW_LT: 3538 file_lock.fl_type = F_RDLCK; 3539 cmd = F_SETLK; 3540 break; 3541 case NFS4_WRITE_LT: 3542 case NFS4_WRITEW_LT: 3543 file_lock.fl_type = F_WRLCK; 3544 cmd = F_SETLK; 3545 break; 3546 default: 3547 status = nfserr_inval; 3548 goto out; 3549 } 3550 file_lock.fl_owner = (fl_owner_t)lock_sop; 3551 file_lock.fl_pid = current->tgid; 3552 file_lock.fl_file = filp; 3553 file_lock.fl_flags = FL_POSIX; 3554 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3555 3556 file_lock.fl_start = lock->lk_offset; 3557 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); 3558 nfs4_transform_lock_offset(&file_lock); 3559 3560 /* 3561 * Try to lock the file in the VFS. 3562 * Note: locks.c uses the BKL to protect the inode's lock list. 3563 */ 3564 3565 err = vfs_lock_file(filp, cmd, &file_lock, &conflock); 3566 switch (-err) { 3567 case 0: /* success! */ 3568 update_stateid(&lock_stp->st_stateid); 3569 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 3570 sizeof(stateid_t)); 3571 status = 0; 3572 break; 3573 case (EAGAIN): /* conflock holds conflicting lock */ 3574 status = nfserr_denied; 3575 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 3576 nfs4_set_lock_denied(&conflock, &lock->lk_denied); 3577 break; 3578 case (EDEADLK): 3579 status = nfserr_deadlock; 3580 break; 3581 default: 3582 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); 3583 status = nfserr_resource; 3584 break; 3585 } 3586 out: 3587 if (status && lock->lk_is_new && lock_sop) 3588 release_lockowner(lock_sop); 3589 if (lock->lk_replay_owner) { 3590 nfs4_get_stateowner(lock->lk_replay_owner); 3591 cstate->replay_owner = lock->lk_replay_owner; 3592 } 3593 nfs4_unlock_state(); 3594 return status; 3595 } 3596 3597 /* 3598 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, 3599 * so we do a temporary open here just to get an open file to pass to 3600 * vfs_test_lock. (Arguably perhaps test_lock should be done with an 3601 * inode operation.) 3602 */ 3603 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) 3604 { 3605 struct file *file; 3606 int err; 3607 3608 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 3609 if (err) 3610 return err; 3611 err = vfs_test_lock(file, lock); 3612 nfsd_close(file); 3613 return err; 3614 } 3615 3616 /* 3617 * LOCKT operation 3618 */ 3619 __be32 3620 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3621 struct nfsd4_lockt *lockt) 3622 { 3623 struct inode *inode; 3624 struct file_lock file_lock; 3625 int error; 3626 __be32 status; 3627 3628 if (locks_in_grace()) 3629 return nfserr_grace; 3630 3631 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 3632 return nfserr_inval; 3633 3634 lockt->lt_stateowner = NULL; 3635 nfs4_lock_state(); 3636 3637 status = nfserr_stale_clientid; 3638 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid)) 3639 goto out; 3640 3641 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) { 3642 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 3643 if (status == nfserr_symlink) 3644 status = nfserr_inval; 3645 goto out; 3646 } 3647 3648 inode = cstate->current_fh.fh_dentry->d_inode; 3649 locks_init_lock(&file_lock); 3650 switch (lockt->lt_type) { 3651 case NFS4_READ_LT: 3652 case NFS4_READW_LT: 3653 file_lock.fl_type = F_RDLCK; 3654 break; 3655 case NFS4_WRITE_LT: 3656 case NFS4_WRITEW_LT: 3657 file_lock.fl_type = F_WRLCK; 3658 break; 3659 default: 3660 dprintk("NFSD: nfs4_lockt: bad lock type!\n"); 3661 status = nfserr_inval; 3662 goto out; 3663 } 3664 3665 lockt->lt_stateowner = find_lockstateowner_str(inode, 3666 &lockt->lt_clientid, &lockt->lt_owner); 3667 if (lockt->lt_stateowner) 3668 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 3669 file_lock.fl_pid = current->tgid; 3670 file_lock.fl_flags = FL_POSIX; 3671 3672 file_lock.fl_start = lockt->lt_offset; 3673 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); 3674 3675 nfs4_transform_lock_offset(&file_lock); 3676 3677 status = nfs_ok; 3678 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock); 3679 if (error) { 3680 status = nfserrno(error); 3681 goto out; 3682 } 3683 if (file_lock.fl_type != F_UNLCK) { 3684 status = nfserr_denied; 3685 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); 3686 } 3687 out: 3688 nfs4_unlock_state(); 3689 return status; 3690 } 3691 3692 __be32 3693 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3694 struct nfsd4_locku *locku) 3695 { 3696 struct nfs4_stateid *stp; 3697 struct file *filp = NULL; 3698 struct file_lock file_lock; 3699 __be32 status; 3700 int err; 3701 3702 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 3703 (long long) locku->lu_offset, 3704 (long long) locku->lu_length); 3705 3706 if (check_lock_length(locku->lu_offset, locku->lu_length)) 3707 return nfserr_inval; 3708 3709 nfs4_lock_state(); 3710 3711 if ((status = nfs4_preprocess_seqid_op(cstate, 3712 locku->lu_seqid, 3713 &locku->lu_stateid, 3714 LOCK_STATE, 3715 &locku->lu_stateowner, &stp, NULL))) 3716 goto out; 3717 3718 filp = stp->st_vfs_file; 3719 BUG_ON(!filp); 3720 locks_init_lock(&file_lock); 3721 file_lock.fl_type = F_UNLCK; 3722 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 3723 file_lock.fl_pid = current->tgid; 3724 file_lock.fl_file = filp; 3725 file_lock.fl_flags = FL_POSIX; 3726 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3727 file_lock.fl_start = locku->lu_offset; 3728 3729 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length); 3730 nfs4_transform_lock_offset(&file_lock); 3731 3732 /* 3733 * Try to unlock the file in the VFS. 3734 */ 3735 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); 3736 if (err) { 3737 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); 3738 goto out_nfserr; 3739 } 3740 /* 3741 * OK, unlock succeeded; the only thing left to do is update the stateid. 3742 */ 3743 update_stateid(&stp->st_stateid); 3744 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 3745 3746 out: 3747 if (locku->lu_stateowner) { 3748 nfs4_get_stateowner(locku->lu_stateowner); 3749 cstate->replay_owner = locku->lu_stateowner; 3750 } 3751 nfs4_unlock_state(); 3752 return status; 3753 3754 out_nfserr: 3755 status = nfserrno(err); 3756 goto out; 3757 } 3758 3759 /* 3760 * returns 3761 * 1: locks held by lockowner 3762 * 0: no locks held by lockowner 3763 */ 3764 static int 3765 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner) 3766 { 3767 struct file_lock **flpp; 3768 struct inode *inode = filp->f_path.dentry->d_inode; 3769 int status = 0; 3770 3771 lock_kernel(); 3772 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 3773 if ((*flpp)->fl_owner == (fl_owner_t)lowner) { 3774 status = 1; 3775 goto out; 3776 } 3777 } 3778 out: 3779 unlock_kernel(); 3780 return status; 3781 } 3782 3783 __be32 3784 nfsd4_release_lockowner(struct svc_rqst *rqstp, 3785 struct nfsd4_compound_state *cstate, 3786 struct nfsd4_release_lockowner *rlockowner) 3787 { 3788 clientid_t *clid = &rlockowner->rl_clientid; 3789 struct nfs4_stateowner *sop; 3790 struct nfs4_stateid *stp; 3791 struct xdr_netobj *owner = &rlockowner->rl_owner; 3792 struct list_head matches; 3793 int i; 3794 __be32 status; 3795 3796 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 3797 clid->cl_boot, clid->cl_id); 3798 3799 /* XXX check for lease expiration */ 3800 3801 status = nfserr_stale_clientid; 3802 if (STALE_CLIENTID(clid)) 3803 return status; 3804 3805 nfs4_lock_state(); 3806 3807 status = nfserr_locks_held; 3808 /* XXX: we're doing a linear search through all the lockowners. 3809 * Yipes! For now we'll just hope clients aren't really using 3810 * release_lockowner much, but eventually we have to fix these 3811 * data structures. */ 3812 INIT_LIST_HEAD(&matches); 3813 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3814 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { 3815 if (!same_owner_str(sop, owner, clid)) 3816 continue; 3817 list_for_each_entry(stp, &sop->so_stateids, 3818 st_perstateowner) { 3819 if (check_for_locks(stp->st_vfs_file, sop)) 3820 goto out; 3821 /* Note: so_perclient unused for lockowners, 3822 * so it's OK to fool with here. */ 3823 list_add(&sop->so_perclient, &matches); 3824 } 3825 } 3826 } 3827 /* Clients probably won't expect us to return with some (but not all) 3828 * of the lockowner state released; so don't release any until all 3829 * have been checked. */ 3830 status = nfs_ok; 3831 while (!list_empty(&matches)) { 3832 sop = list_entry(matches.next, struct nfs4_stateowner, 3833 so_perclient); 3834 /* unhash_stateowner deletes so_perclient only 3835 * for openowners. */ 3836 list_del(&sop->so_perclient); 3837 release_lockowner(sop); 3838 } 3839 out: 3840 nfs4_unlock_state(); 3841 return status; 3842 } 3843 3844 static inline struct nfs4_client_reclaim * 3845 alloc_reclaim(void) 3846 { 3847 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 3848 } 3849 3850 int 3851 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id) 3852 { 3853 unsigned int strhashval = clientstr_hashval(name); 3854 struct nfs4_client *clp; 3855 3856 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id); 3857 return clp ? 1 : 0; 3858 } 3859 3860 /* 3861 * failure => all reset bets are off, nfserr_no_grace... 3862 */ 3863 int 3864 nfs4_client_to_reclaim(const char *name) 3865 { 3866 unsigned int strhashval; 3867 struct nfs4_client_reclaim *crp = NULL; 3868 3869 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 3870 crp = alloc_reclaim(); 3871 if (!crp) 3872 return 0; 3873 strhashval = clientstr_hashval(name); 3874 INIT_LIST_HEAD(&crp->cr_strhash); 3875 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 3876 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 3877 reclaim_str_hashtbl_size++; 3878 return 1; 3879 } 3880 3881 static void 3882 nfs4_release_reclaim(void) 3883 { 3884 struct nfs4_client_reclaim *crp = NULL; 3885 int i; 3886 3887 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3888 while (!list_empty(&reclaim_str_hashtbl[i])) { 3889 crp = list_entry(reclaim_str_hashtbl[i].next, 3890 struct nfs4_client_reclaim, cr_strhash); 3891 list_del(&crp->cr_strhash); 3892 kfree(crp); 3893 reclaim_str_hashtbl_size--; 3894 } 3895 } 3896 BUG_ON(reclaim_str_hashtbl_size); 3897 } 3898 3899 /* 3900 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 3901 static struct nfs4_client_reclaim * 3902 nfs4_find_reclaim_client(clientid_t *clid) 3903 { 3904 unsigned int strhashval; 3905 struct nfs4_client *clp; 3906 struct nfs4_client_reclaim *crp = NULL; 3907 3908 3909 /* find clientid in conf_id_hashtbl */ 3910 clp = find_confirmed_client(clid); 3911 if (clp == NULL) 3912 return NULL; 3913 3914 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", 3915 clp->cl_name.len, clp->cl_name.data, 3916 clp->cl_recdir); 3917 3918 /* find clp->cl_name in reclaim_str_hashtbl */ 3919 strhashval = clientstr_hashval(clp->cl_recdir); 3920 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 3921 if (same_name(crp->cr_recdir, clp->cl_recdir)) { 3922 return crp; 3923 } 3924 } 3925 return NULL; 3926 } 3927 3928 /* 3929 * Called from OPEN. Look for clientid in reclaim list. 3930 */ 3931 __be32 3932 nfs4_check_open_reclaim(clientid_t *clid) 3933 { 3934 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; 3935 } 3936 3937 /* initialization to perform at module load time: */ 3938 3939 int 3940 nfs4_state_init(void) 3941 { 3942 int i, status; 3943 3944 status = nfsd4_init_slabs(); 3945 if (status) 3946 return status; 3947 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3948 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 3949 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 3950 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 3951 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 3952 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 3953 } 3954 for (i = 0; i < SESSION_HASH_SIZE; i++) 3955 INIT_LIST_HEAD(&sessionid_hashtbl[i]); 3956 for (i = 0; i < FILE_HASH_SIZE; i++) { 3957 INIT_LIST_HEAD(&file_hashtbl[i]); 3958 } 3959 for (i = 0; i < OWNER_HASH_SIZE; i++) { 3960 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 3961 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 3962 } 3963 for (i = 0; i < STATEID_HASH_SIZE; i++) { 3964 INIT_LIST_HEAD(&stateid_hashtbl[i]); 3965 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 3966 } 3967 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3968 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 3969 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 3970 } 3971 memset(&onestateid, ~0, sizeof(stateid_t)); 3972 INIT_LIST_HEAD(&close_lru); 3973 INIT_LIST_HEAD(&client_lru); 3974 INIT_LIST_HEAD(&del_recall_lru); 3975 reclaim_str_hashtbl_size = 0; 3976 return 0; 3977 } 3978 3979 static void 3980 nfsd4_load_reboot_recovery_data(void) 3981 { 3982 int status; 3983 3984 nfs4_lock_state(); 3985 nfsd4_init_recdir(user_recovery_dirname); 3986 status = nfsd4_recdir_load(); 3987 nfs4_unlock_state(); 3988 if (status) 3989 printk("NFSD: Failure reading reboot recovery data\n"); 3990 } 3991 3992 unsigned long 3993 get_nfs4_grace_period(void) 3994 { 3995 return max(user_lease_time, lease_time) * HZ; 3996 } 3997 3998 /* 3999 * Since the lifetime of a delegation isn't limited to that of an open, a 4000 * client may quite reasonably hang on to a delegation as long as it has 4001 * the inode cached. This becomes an obvious problem the first time a 4002 * client's inode cache approaches the size of the server's total memory. 4003 * 4004 * For now we avoid this problem by imposing a hard limit on the number 4005 * of delegations, which varies according to the server's memory size. 4006 */ 4007 static void 4008 set_max_delegations(void) 4009 { 4010 /* 4011 * Allow at most 4 delegations per megabyte of RAM. Quick 4012 * estimates suggest that in the worst case (where every delegation 4013 * is for a different inode), a delegation could take about 1.5K, 4014 * giving a worst case usage of about 6% of memory. 4015 */ 4016 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); 4017 } 4018 4019 /* initialization to perform when the nfsd service is started: */ 4020 4021 static int 4022 __nfs4_state_start(void) 4023 { 4024 unsigned long grace_time; 4025 4026 boot_time = get_seconds(); 4027 grace_time = get_nfs4_grace_period(); 4028 lease_time = user_lease_time; 4029 locks_start_grace(&nfsd4_manager); 4030 printk(KERN_INFO "NFSD: starting %ld-second grace period\n", 4031 grace_time/HZ); 4032 laundry_wq = create_singlethread_workqueue("nfsd4"); 4033 if (laundry_wq == NULL) 4034 return -ENOMEM; 4035 queue_delayed_work(laundry_wq, &laundromat_work, grace_time); 4036 set_max_delegations(); 4037 return set_callback_cred(); 4038 } 4039 4040 int 4041 nfs4_state_start(void) 4042 { 4043 int ret; 4044 4045 if (nfs4_init) 4046 return 0; 4047 nfsd4_load_reboot_recovery_data(); 4048 ret = __nfs4_state_start(); 4049 if (ret) 4050 return ret; 4051 nfs4_init = 1; 4052 return 0; 4053 } 4054 4055 time_t 4056 nfs4_lease_time(void) 4057 { 4058 return lease_time; 4059 } 4060 4061 static void 4062 __nfs4_state_shutdown(void) 4063 { 4064 int i; 4065 struct nfs4_client *clp = NULL; 4066 struct nfs4_delegation *dp = NULL; 4067 struct list_head *pos, *next, reaplist; 4068 4069 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 4070 while (!list_empty(&conf_id_hashtbl[i])) { 4071 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 4072 expire_client(clp); 4073 } 4074 while (!list_empty(&unconf_str_hashtbl[i])) { 4075 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 4076 expire_client(clp); 4077 } 4078 } 4079 INIT_LIST_HEAD(&reaplist); 4080 spin_lock(&recall_lock); 4081 list_for_each_safe(pos, next, &del_recall_lru) { 4082 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4083 list_move(&dp->dl_recall_lru, &reaplist); 4084 } 4085 spin_unlock(&recall_lock); 4086 list_for_each_safe(pos, next, &reaplist) { 4087 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4088 list_del_init(&dp->dl_recall_lru); 4089 unhash_delegation(dp); 4090 } 4091 4092 nfsd4_shutdown_recdir(); 4093 nfs4_init = 0; 4094 } 4095 4096 void 4097 nfs4_state_shutdown(void) 4098 { 4099 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); 4100 destroy_workqueue(laundry_wq); 4101 locks_end_grace(&nfsd4_manager); 4102 nfs4_lock_state(); 4103 nfs4_release_reclaim(); 4104 __nfs4_state_shutdown(); 4105 nfs4_unlock_state(); 4106 } 4107 4108 /* 4109 * user_recovery_dirname is protected by the nfsd_mutex since it's only 4110 * accessed when nfsd is starting. 4111 */ 4112 static void 4113 nfs4_set_recdir(char *recdir) 4114 { 4115 strcpy(user_recovery_dirname, recdir); 4116 } 4117 4118 /* 4119 * Change the NFSv4 recovery directory to recdir. 4120 */ 4121 int 4122 nfs4_reset_recoverydir(char *recdir) 4123 { 4124 int status; 4125 struct path path; 4126 4127 status = kern_path(recdir, LOOKUP_FOLLOW, &path); 4128 if (status) 4129 return status; 4130 status = -ENOTDIR; 4131 if (S_ISDIR(path.dentry->d_inode->i_mode)) { 4132 nfs4_set_recdir(recdir); 4133 status = 0; 4134 } 4135 path_put(&path); 4136 return status; 4137 } 4138 4139 char * 4140 nfs4_recoverydir(void) 4141 { 4142 return user_recovery_dirname; 4143 } 4144 4145 /* 4146 * Called when leasetime is changed. 4147 * 4148 * The only way the protocol gives us to handle on-the-fly lease changes is to 4149 * simulate a reboot. Instead of doing that, we just wait till the next time 4150 * we start to register any changes in lease time. If the administrator 4151 * really wants to change the lease time *now*, they can go ahead and bring 4152 * nfsd down and then back up again after changing the lease time. 4153 * 4154 * user_lease_time is protected by nfsd_mutex since it's only really accessed 4155 * when nfsd is starting 4156 */ 4157 void 4158 nfs4_reset_lease(time_t leasetime) 4159 { 4160 user_lease_time = leasetime; 4161 } 4162