1 /* 2 * Copyright (c) 2001 The Regents of the University of Michigan. 3 * All rights reserved. 4 * 5 * Kendrick Smith <kmsmith@umich.edu> 6 * Andy Adamson <kandros@umich.edu> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35 #include <linux/file.h> 36 #include <linux/smp_lock.h> 37 #include <linux/slab.h> 38 #include <linux/namei.h> 39 #include <linux/swap.h> 40 #include <linux/sunrpc/svcauth_gss.h> 41 #include <linux/sunrpc/clnt.h> 42 #include "xdr4.h" 43 #include "vfs.h" 44 45 #define NFSDDBG_FACILITY NFSDDBG_PROC 46 47 /* Globals */ 48 time_t nfsd4_lease = 90; /* default lease time */ 49 time_t nfsd4_grace = 90; 50 static time_t boot_time; 51 static u32 current_ownerid = 1; 52 static u32 current_fileid = 1; 53 static u32 current_delegid = 1; 54 static u32 nfs4_init; 55 static stateid_t zerostateid; /* bits all 0 */ 56 static stateid_t onestateid; /* bits all 1 */ 57 static u64 current_sessionid = 1; 58 59 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t))) 60 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t))) 61 62 /* forward declarations */ 63 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); 64 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); 65 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; 66 static void nfs4_set_recdir(char *recdir); 67 68 /* Locking: */ 69 70 /* Currently used for almost all code touching nfsv4 state: */ 71 static DEFINE_MUTEX(client_mutex); 72 73 /* 74 * Currently used for the del_recall_lru and file hash table. In an 75 * effort to decrease the scope of the client_mutex, this spinlock may 76 * eventually cover more: 77 */ 78 static DEFINE_SPINLOCK(recall_lock); 79 80 static struct kmem_cache *stateowner_slab = NULL; 81 static struct kmem_cache *file_slab = NULL; 82 static struct kmem_cache *stateid_slab = NULL; 83 static struct kmem_cache *deleg_slab = NULL; 84 85 void 86 nfs4_lock_state(void) 87 { 88 mutex_lock(&client_mutex); 89 } 90 91 void 92 nfs4_unlock_state(void) 93 { 94 mutex_unlock(&client_mutex); 95 } 96 97 static inline u32 98 opaque_hashval(const void *ptr, int nbytes) 99 { 100 unsigned char *cptr = (unsigned char *) ptr; 101 102 u32 x = 0; 103 while (nbytes--) { 104 x *= 37; 105 x += *cptr++; 106 } 107 return x; 108 } 109 110 static struct list_head del_recall_lru; 111 112 static inline void 113 put_nfs4_file(struct nfs4_file *fi) 114 { 115 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { 116 list_del(&fi->fi_hash); 117 spin_unlock(&recall_lock); 118 iput(fi->fi_inode); 119 kmem_cache_free(file_slab, fi); 120 } 121 } 122 123 static inline void 124 get_nfs4_file(struct nfs4_file *fi) 125 { 126 atomic_inc(&fi->fi_ref); 127 } 128 129 static int num_delegations; 130 unsigned int max_delegations; 131 132 /* 133 * Open owner state (share locks) 134 */ 135 136 /* hash tables for nfs4_stateowner */ 137 #define OWNER_HASH_BITS 8 138 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 139 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 140 141 #define ownerid_hashval(id) \ 142 ((id) & OWNER_HASH_MASK) 143 #define ownerstr_hashval(clientid, ownername) \ 144 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 145 146 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 147 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 148 149 /* hash table for nfs4_file */ 150 #define FILE_HASH_BITS 8 151 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 152 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 153 /* hash table for (open)nfs4_stateid */ 154 #define STATEID_HASH_BITS 10 155 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 156 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 157 158 #define file_hashval(x) \ 159 hash_ptr(x, FILE_HASH_BITS) 160 #define stateid_hashval(owner_id, file_id) \ 161 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 162 163 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 164 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 165 166 static struct nfs4_delegation * 167 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 168 { 169 struct nfs4_delegation *dp; 170 struct nfs4_file *fp = stp->st_file; 171 struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn; 172 173 dprintk("NFSD alloc_init_deleg\n"); 174 if (fp->fi_had_conflict) 175 return NULL; 176 if (num_delegations > max_delegations) 177 return NULL; 178 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); 179 if (dp == NULL) 180 return dp; 181 num_delegations++; 182 INIT_LIST_HEAD(&dp->dl_perfile); 183 INIT_LIST_HEAD(&dp->dl_perclnt); 184 INIT_LIST_HEAD(&dp->dl_recall_lru); 185 dp->dl_client = clp; 186 get_nfs4_file(fp); 187 dp->dl_file = fp; 188 dp->dl_flock = NULL; 189 get_file(stp->st_vfs_file); 190 dp->dl_vfs_file = stp->st_vfs_file; 191 dp->dl_type = type; 192 dp->dl_ident = cb->cb_ident; 193 dp->dl_stateid.si_boot = boot_time; 194 dp->dl_stateid.si_stateownerid = current_delegid++; 195 dp->dl_stateid.si_fileid = 0; 196 dp->dl_stateid.si_generation = 0; 197 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle); 198 dp->dl_time = 0; 199 atomic_set(&dp->dl_count, 1); 200 list_add(&dp->dl_perfile, &fp->fi_delegations); 201 list_add(&dp->dl_perclnt, &clp->cl_delegations); 202 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc); 203 return dp; 204 } 205 206 void 207 nfs4_put_delegation(struct nfs4_delegation *dp) 208 { 209 if (atomic_dec_and_test(&dp->dl_count)) { 210 dprintk("NFSD: freeing dp %p\n",dp); 211 put_nfs4_file(dp->dl_file); 212 kmem_cache_free(deleg_slab, dp); 213 num_delegations--; 214 } 215 } 216 217 /* Remove the associated file_lock first, then remove the delegation. 218 * lease_modify() is called to remove the FS_LEASE file_lock from 219 * the i_flock list, eventually calling nfsd's lock_manager 220 * fl_release_callback. 221 */ 222 static void 223 nfs4_close_delegation(struct nfs4_delegation *dp) 224 { 225 struct file *filp = dp->dl_vfs_file; 226 227 dprintk("NFSD: close_delegation dp %p\n",dp); 228 dp->dl_vfs_file = NULL; 229 /* The following nfsd_close may not actually close the file, 230 * but we want to remove the lease in any case. */ 231 if (dp->dl_flock) 232 vfs_setlease(filp, F_UNLCK, &dp->dl_flock); 233 nfsd_close(filp); 234 } 235 236 /* Called under the state lock. */ 237 static void 238 unhash_delegation(struct nfs4_delegation *dp) 239 { 240 list_del_init(&dp->dl_perfile); 241 list_del_init(&dp->dl_perclnt); 242 spin_lock(&recall_lock); 243 list_del_init(&dp->dl_recall_lru); 244 spin_unlock(&recall_lock); 245 nfs4_close_delegation(dp); 246 nfs4_put_delegation(dp); 247 } 248 249 /* 250 * SETCLIENTID state 251 */ 252 253 /* client_lock protects the client lru list and session hash table */ 254 static DEFINE_SPINLOCK(client_lock); 255 256 /* Hash tables for nfs4_clientid state */ 257 #define CLIENT_HASH_BITS 4 258 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 259 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 260 261 #define clientid_hashval(id) \ 262 ((id) & CLIENT_HASH_MASK) 263 #define clientstr_hashval(name) \ 264 (opaque_hashval((name), 8) & CLIENT_HASH_MASK) 265 /* 266 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 267 * used in reboot/reset lease grace period processing 268 * 269 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 270 * setclientid_confirmed info. 271 * 272 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 273 * setclientid info. 274 * 275 * client_lru holds client queue ordered by nfs4_client.cl_time 276 * for lease renewal. 277 * 278 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 279 * for last close replay. 280 */ 281 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 282 static int reclaim_str_hashtbl_size = 0; 283 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 284 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 285 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 286 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 287 static struct list_head client_lru; 288 static struct list_head close_lru; 289 290 static void unhash_generic_stateid(struct nfs4_stateid *stp) 291 { 292 list_del(&stp->st_hash); 293 list_del(&stp->st_perfile); 294 list_del(&stp->st_perstateowner); 295 } 296 297 static void free_generic_stateid(struct nfs4_stateid *stp) 298 { 299 put_nfs4_file(stp->st_file); 300 kmem_cache_free(stateid_slab, stp); 301 } 302 303 static void release_lock_stateid(struct nfs4_stateid *stp) 304 { 305 unhash_generic_stateid(stp); 306 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner); 307 free_generic_stateid(stp); 308 } 309 310 static void unhash_lockowner(struct nfs4_stateowner *sop) 311 { 312 struct nfs4_stateid *stp; 313 314 list_del(&sop->so_idhash); 315 list_del(&sop->so_strhash); 316 list_del(&sop->so_perstateid); 317 while (!list_empty(&sop->so_stateids)) { 318 stp = list_first_entry(&sop->so_stateids, 319 struct nfs4_stateid, st_perstateowner); 320 release_lock_stateid(stp); 321 } 322 } 323 324 static void release_lockowner(struct nfs4_stateowner *sop) 325 { 326 unhash_lockowner(sop); 327 nfs4_put_stateowner(sop); 328 } 329 330 static void 331 release_stateid_lockowners(struct nfs4_stateid *open_stp) 332 { 333 struct nfs4_stateowner *lock_sop; 334 335 while (!list_empty(&open_stp->st_lockowners)) { 336 lock_sop = list_entry(open_stp->st_lockowners.next, 337 struct nfs4_stateowner, so_perstateid); 338 /* list_del(&open_stp->st_lockowners); */ 339 BUG_ON(lock_sop->so_is_open_owner); 340 release_lockowner(lock_sop); 341 } 342 } 343 344 static void release_open_stateid(struct nfs4_stateid *stp) 345 { 346 unhash_generic_stateid(stp); 347 release_stateid_lockowners(stp); 348 nfsd_close(stp->st_vfs_file); 349 free_generic_stateid(stp); 350 } 351 352 static void unhash_openowner(struct nfs4_stateowner *sop) 353 { 354 struct nfs4_stateid *stp; 355 356 list_del(&sop->so_idhash); 357 list_del(&sop->so_strhash); 358 list_del(&sop->so_perclient); 359 list_del(&sop->so_perstateid); /* XXX: necessary? */ 360 while (!list_empty(&sop->so_stateids)) { 361 stp = list_first_entry(&sop->so_stateids, 362 struct nfs4_stateid, st_perstateowner); 363 release_open_stateid(stp); 364 } 365 } 366 367 static void release_openowner(struct nfs4_stateowner *sop) 368 { 369 unhash_openowner(sop); 370 list_del(&sop->so_close_lru); 371 nfs4_put_stateowner(sop); 372 } 373 374 #define SESSION_HASH_SIZE 512 375 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE]; 376 377 static inline int 378 hash_sessionid(struct nfs4_sessionid *sessionid) 379 { 380 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; 381 382 return sid->sequence % SESSION_HASH_SIZE; 383 } 384 385 static inline void 386 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) 387 { 388 u32 *ptr = (u32 *)(&sessionid->data[0]); 389 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); 390 } 391 392 static void 393 gen_sessionid(struct nfsd4_session *ses) 394 { 395 struct nfs4_client *clp = ses->se_client; 396 struct nfsd4_sessionid *sid; 397 398 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; 399 sid->clientid = clp->cl_clientid; 400 sid->sequence = current_sessionid++; 401 sid->reserved = 0; 402 } 403 404 /* 405 * The protocol defines ca_maxresponssize_cached to include the size of 406 * the rpc header, but all we need to cache is the data starting after 407 * the end of the initial SEQUENCE operation--the rest we regenerate 408 * each time. Therefore we can advertise a ca_maxresponssize_cached 409 * value that is the number of bytes in our cache plus a few additional 410 * bytes. In order to stay on the safe side, and not promise more than 411 * we can cache, those additional bytes must be the minimum possible: 24 412 * bytes of rpc header (xid through accept state, with AUTH_NULL 413 * verifier), 12 for the compound header (with zero-length tag), and 44 414 * for the SEQUENCE op response: 415 */ 416 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) 417 418 /* 419 * Give the client the number of ca_maxresponsesize_cached slots it 420 * requests, of size bounded by NFSD_SLOT_CACHE_SIZE, 421 * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more 422 * than NFSD_MAX_SLOTS_PER_SESSION. 423 * 424 * If we run out of reserved DRC memory we should (up to a point) 425 * re-negotiate active sessions and reduce their slot usage to make 426 * rooom for new connections. For now we just fail the create session. 427 */ 428 static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan) 429 { 430 int mem, size = fchan->maxresp_cached; 431 432 if (fchan->maxreqs < 1) 433 return nfserr_inval; 434 435 if (size < NFSD_MIN_HDR_SEQ_SZ) 436 size = NFSD_MIN_HDR_SEQ_SZ; 437 size -= NFSD_MIN_HDR_SEQ_SZ; 438 if (size > NFSD_SLOT_CACHE_SIZE) 439 size = NFSD_SLOT_CACHE_SIZE; 440 441 /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */ 442 mem = fchan->maxreqs * size; 443 if (mem > NFSD_MAX_MEM_PER_SESSION) { 444 fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size; 445 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION) 446 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION; 447 mem = fchan->maxreqs * size; 448 } 449 450 spin_lock(&nfsd_drc_lock); 451 /* bound the total session drc memory ussage */ 452 if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) { 453 fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size; 454 mem = fchan->maxreqs * size; 455 } 456 nfsd_drc_mem_used += mem; 457 spin_unlock(&nfsd_drc_lock); 458 459 if (fchan->maxreqs == 0) 460 return nfserr_serverfault; 461 462 fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ; 463 return 0; 464 } 465 466 /* 467 * fchan holds the client values on input, and the server values on output 468 * sv_max_mesg is the maximum payload plus one page for overhead. 469 */ 470 static int init_forechannel_attrs(struct svc_rqst *rqstp, 471 struct nfsd4_channel_attrs *session_fchan, 472 struct nfsd4_channel_attrs *fchan) 473 { 474 int status = 0; 475 __u32 maxcount = nfsd_serv->sv_max_mesg; 476 477 /* headerpadsz set to zero in encode routine */ 478 479 /* Use the client's max request and max response size if possible */ 480 if (fchan->maxreq_sz > maxcount) 481 fchan->maxreq_sz = maxcount; 482 session_fchan->maxreq_sz = fchan->maxreq_sz; 483 484 if (fchan->maxresp_sz > maxcount) 485 fchan->maxresp_sz = maxcount; 486 session_fchan->maxresp_sz = fchan->maxresp_sz; 487 488 /* Use the client's maxops if possible */ 489 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND) 490 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND; 491 session_fchan->maxops = fchan->maxops; 492 493 /* FIXME: Error means no more DRC pages so the server should 494 * recover pages from existing sessions. For now fail session 495 * creation. 496 */ 497 status = set_forechannel_drc_size(fchan); 498 499 session_fchan->maxresp_cached = fchan->maxresp_cached; 500 session_fchan->maxreqs = fchan->maxreqs; 501 502 dprintk("%s status %d\n", __func__, status); 503 return status; 504 } 505 506 static void 507 free_session_slots(struct nfsd4_session *ses) 508 { 509 int i; 510 511 for (i = 0; i < ses->se_fchannel.maxreqs; i++) 512 kfree(ses->se_slots[i]); 513 } 514 515 /* 516 * We don't actually need to cache the rpc and session headers, so we 517 * can allocate a little less for each slot: 518 */ 519 static inline int slot_bytes(struct nfsd4_channel_attrs *ca) 520 { 521 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; 522 } 523 524 static int 525 alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, 526 struct nfsd4_create_session *cses) 527 { 528 struct nfsd4_session *new, tmp; 529 struct nfsd4_slot *sp; 530 int idx, slotsize, cachesize, i; 531 int status; 532 533 memset(&tmp, 0, sizeof(tmp)); 534 535 /* FIXME: For now, we just accept the client back channel attributes. */ 536 tmp.se_bchannel = cses->back_channel; 537 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel, 538 &cses->fore_channel); 539 if (status) 540 goto out; 541 542 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot) 543 + sizeof(struct nfsd4_session) > PAGE_SIZE); 544 545 status = nfserr_serverfault; 546 /* allocate struct nfsd4_session and slot table pointers in one piece */ 547 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *); 548 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL); 549 if (!new) 550 goto out; 551 552 memcpy(new, &tmp, sizeof(*new)); 553 554 /* allocate each struct nfsd4_slot and data cache in one piece */ 555 cachesize = slot_bytes(&new->se_fchannel); 556 for (i = 0; i < new->se_fchannel.maxreqs; i++) { 557 sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL); 558 if (!sp) 559 goto out_free; 560 new->se_slots[i] = sp; 561 } 562 563 new->se_client = clp; 564 gen_sessionid(new); 565 idx = hash_sessionid(&new->se_sessionid); 566 memcpy(clp->cl_sessionid.data, new->se_sessionid.data, 567 NFS4_MAX_SESSIONID_LEN); 568 569 new->se_flags = cses->flags; 570 kref_init(&new->se_ref); 571 spin_lock(&client_lock); 572 list_add(&new->se_hash, &sessionid_hashtbl[idx]); 573 list_add(&new->se_perclnt, &clp->cl_sessions); 574 spin_unlock(&client_lock); 575 576 status = nfs_ok; 577 out: 578 return status; 579 out_free: 580 free_session_slots(new); 581 kfree(new); 582 goto out; 583 } 584 585 /* caller must hold client_lock */ 586 static struct nfsd4_session * 587 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid) 588 { 589 struct nfsd4_session *elem; 590 int idx; 591 592 dump_sessionid(__func__, sessionid); 593 idx = hash_sessionid(sessionid); 594 dprintk("%s: idx is %d\n", __func__, idx); 595 /* Search in the appropriate list */ 596 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) { 597 dump_sessionid("list traversal", &elem->se_sessionid); 598 if (!memcmp(elem->se_sessionid.data, sessionid->data, 599 NFS4_MAX_SESSIONID_LEN)) { 600 return elem; 601 } 602 } 603 604 dprintk("%s: session not found\n", __func__); 605 return NULL; 606 } 607 608 /* caller must hold client_lock */ 609 static void 610 unhash_session(struct nfsd4_session *ses) 611 { 612 list_del(&ses->se_hash); 613 list_del(&ses->se_perclnt); 614 } 615 616 void 617 free_session(struct kref *kref) 618 { 619 struct nfsd4_session *ses; 620 int mem; 621 622 ses = container_of(kref, struct nfsd4_session, se_ref); 623 spin_lock(&nfsd_drc_lock); 624 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel); 625 nfsd_drc_mem_used -= mem; 626 spin_unlock(&nfsd_drc_lock); 627 free_session_slots(ses); 628 kfree(ses); 629 } 630 631 /* must be called under the client_lock */ 632 static inline void 633 renew_client_locked(struct nfs4_client *clp) 634 { 635 if (is_client_expired(clp)) { 636 dprintk("%s: client (clientid %08x/%08x) already expired\n", 637 __func__, 638 clp->cl_clientid.cl_boot, 639 clp->cl_clientid.cl_id); 640 return; 641 } 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 static inline void 654 renew_client(struct nfs4_client *clp) 655 { 656 spin_lock(&client_lock); 657 renew_client_locked(clp); 658 spin_unlock(&client_lock); 659 } 660 661 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 662 static int 663 STALE_CLIENTID(clientid_t *clid) 664 { 665 if (clid->cl_boot == boot_time) 666 return 0; 667 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", 668 clid->cl_boot, clid->cl_id, boot_time); 669 return 1; 670 } 671 672 /* 673 * XXX Should we use a slab cache ? 674 * This type of memory management is somewhat inefficient, but we use it 675 * anyway since SETCLIENTID is not a common operation. 676 */ 677 static struct nfs4_client *alloc_client(struct xdr_netobj name) 678 { 679 struct nfs4_client *clp; 680 681 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); 682 if (clp == NULL) 683 return NULL; 684 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL); 685 if (clp->cl_name.data == NULL) { 686 kfree(clp); 687 return NULL; 688 } 689 memcpy(clp->cl_name.data, name.data, name.len); 690 clp->cl_name.len = name.len; 691 return clp; 692 } 693 694 static inline void 695 free_client(struct nfs4_client *clp) 696 { 697 if (clp->cl_cred.cr_group_info) 698 put_group_info(clp->cl_cred.cr_group_info); 699 kfree(clp->cl_principal); 700 kfree(clp->cl_name.data); 701 kfree(clp); 702 } 703 704 void 705 release_session_client(struct nfsd4_session *session) 706 { 707 struct nfs4_client *clp = session->se_client; 708 709 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock)) 710 return; 711 if (is_client_expired(clp)) { 712 free_client(clp); 713 session->se_client = NULL; 714 } else 715 renew_client_locked(clp); 716 spin_unlock(&client_lock); 717 nfsd4_put_session(session); 718 } 719 720 /* must be called under the client_lock */ 721 static inline void 722 unhash_client_locked(struct nfs4_client *clp) 723 { 724 mark_client_expired(clp); 725 list_del(&clp->cl_lru); 726 while (!list_empty(&clp->cl_sessions)) { 727 struct nfsd4_session *ses; 728 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, 729 se_perclnt); 730 unhash_session(ses); 731 nfsd4_put_session(ses); 732 } 733 } 734 735 static void 736 expire_client(struct nfs4_client *clp) 737 { 738 struct nfs4_stateowner *sop; 739 struct nfs4_delegation *dp; 740 struct list_head reaplist; 741 742 INIT_LIST_HEAD(&reaplist); 743 spin_lock(&recall_lock); 744 while (!list_empty(&clp->cl_delegations)) { 745 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 746 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 747 dp->dl_flock); 748 list_del_init(&dp->dl_perclnt); 749 list_move(&dp->dl_recall_lru, &reaplist); 750 } 751 spin_unlock(&recall_lock); 752 while (!list_empty(&reaplist)) { 753 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 754 list_del_init(&dp->dl_recall_lru); 755 unhash_delegation(dp); 756 } 757 while (!list_empty(&clp->cl_openowners)) { 758 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); 759 release_openowner(sop); 760 } 761 nfsd4_set_callback_client(clp, NULL); 762 if (clp->cl_cb_conn.cb_xprt) 763 svc_xprt_put(clp->cl_cb_conn.cb_xprt); 764 list_del(&clp->cl_idhash); 765 list_del(&clp->cl_strhash); 766 spin_lock(&client_lock); 767 unhash_client_locked(clp); 768 if (atomic_read(&clp->cl_refcount) == 0) 769 free_client(clp); 770 spin_unlock(&client_lock); 771 } 772 773 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) 774 { 775 memcpy(target->cl_verifier.data, source->data, 776 sizeof(target->cl_verifier.data)); 777 } 778 779 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) 780 { 781 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 782 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 783 } 784 785 static void copy_cred(struct svc_cred *target, struct svc_cred *source) 786 { 787 target->cr_uid = source->cr_uid; 788 target->cr_gid = source->cr_gid; 789 target->cr_group_info = source->cr_group_info; 790 get_group_info(target->cr_group_info); 791 } 792 793 static int same_name(const char *n1, const char *n2) 794 { 795 return 0 == memcmp(n1, n2, HEXDIR_LEN); 796 } 797 798 static int 799 same_verf(nfs4_verifier *v1, nfs4_verifier *v2) 800 { 801 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); 802 } 803 804 static int 805 same_clid(clientid_t *cl1, clientid_t *cl2) 806 { 807 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); 808 } 809 810 /* XXX what about NGROUP */ 811 static int 812 same_creds(struct svc_cred *cr1, struct svc_cred *cr2) 813 { 814 return cr1->cr_uid == cr2->cr_uid; 815 } 816 817 static void gen_clid(struct nfs4_client *clp) 818 { 819 static u32 current_clientid = 1; 820 821 clp->cl_clientid.cl_boot = boot_time; 822 clp->cl_clientid.cl_id = current_clientid++; 823 } 824 825 static void gen_confirm(struct nfs4_client *clp) 826 { 827 static u32 i; 828 u32 *p; 829 830 p = (u32 *)clp->cl_confirm.data; 831 *p++ = get_seconds(); 832 *p++ = i++; 833 } 834 835 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir, 836 struct svc_rqst *rqstp, nfs4_verifier *verf) 837 { 838 struct nfs4_client *clp; 839 struct sockaddr *sa = svc_addr(rqstp); 840 char *princ; 841 842 clp = alloc_client(name); 843 if (clp == NULL) 844 return NULL; 845 846 princ = svc_gss_principal(rqstp); 847 if (princ) { 848 clp->cl_principal = kstrdup(princ, GFP_KERNEL); 849 if (clp->cl_principal == NULL) { 850 free_client(clp); 851 return NULL; 852 } 853 } 854 855 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); 856 atomic_set(&clp->cl_refcount, 0); 857 atomic_set(&clp->cl_cb_set, 0); 858 INIT_LIST_HEAD(&clp->cl_idhash); 859 INIT_LIST_HEAD(&clp->cl_strhash); 860 INIT_LIST_HEAD(&clp->cl_openowners); 861 INIT_LIST_HEAD(&clp->cl_delegations); 862 INIT_LIST_HEAD(&clp->cl_sessions); 863 INIT_LIST_HEAD(&clp->cl_lru); 864 clp->cl_time = get_seconds(); 865 clear_bit(0, &clp->cl_cb_slot_busy); 866 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); 867 copy_verf(clp, verf); 868 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); 869 clp->cl_flavor = rqstp->rq_flavor; 870 copy_cred(&clp->cl_cred, &rqstp->rq_cred); 871 gen_confirm(clp); 872 873 return clp; 874 } 875 876 static int check_name(struct xdr_netobj name) 877 { 878 if (name.len == 0) 879 return 0; 880 if (name.len > NFS4_OPAQUE_LIMIT) { 881 dprintk("NFSD: check_name: name too long(%d)!\n", name.len); 882 return 0; 883 } 884 return 1; 885 } 886 887 static void 888 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 889 { 890 unsigned int idhashval; 891 892 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 893 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 894 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 895 renew_client(clp); 896 } 897 898 static void 899 move_to_confirmed(struct nfs4_client *clp) 900 { 901 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 902 unsigned int strhashval; 903 904 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 905 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 906 strhashval = clientstr_hashval(clp->cl_recdir); 907 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 908 renew_client(clp); 909 } 910 911 static struct nfs4_client * 912 find_confirmed_client(clientid_t *clid) 913 { 914 struct nfs4_client *clp; 915 unsigned int idhashval = clientid_hashval(clid->cl_id); 916 917 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 918 if (same_clid(&clp->cl_clientid, clid)) 919 return clp; 920 } 921 return NULL; 922 } 923 924 static struct nfs4_client * 925 find_unconfirmed_client(clientid_t *clid) 926 { 927 struct nfs4_client *clp; 928 unsigned int idhashval = clientid_hashval(clid->cl_id); 929 930 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 931 if (same_clid(&clp->cl_clientid, clid)) 932 return clp; 933 } 934 return NULL; 935 } 936 937 /* 938 * Return 1 iff clp's clientid establishment method matches the use_exchange_id 939 * parameter. Matching is based on the fact the at least one of the 940 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1 941 * 942 * FIXME: we need to unify the clientid namespaces for nfsv4.x 943 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID 944 * and SET_CLIENTID{,_CONFIRM} 945 */ 946 static inline int 947 match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id) 948 { 949 bool has_exchange_flags = (clp->cl_exchange_flags != 0); 950 return use_exchange_id == has_exchange_flags; 951 } 952 953 static struct nfs4_client * 954 find_confirmed_client_by_str(const char *dname, unsigned int hashval, 955 bool use_exchange_id) 956 { 957 struct nfs4_client *clp; 958 959 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { 960 if (same_name(clp->cl_recdir, dname) && 961 match_clientid_establishment(clp, use_exchange_id)) 962 return clp; 963 } 964 return NULL; 965 } 966 967 static struct nfs4_client * 968 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval, 969 bool use_exchange_id) 970 { 971 struct nfs4_client *clp; 972 973 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { 974 if (same_name(clp->cl_recdir, dname) && 975 match_clientid_establishment(clp, use_exchange_id)) 976 return clp; 977 } 978 return NULL; 979 } 980 981 static void 982 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid) 983 { 984 struct nfs4_cb_conn *cb = &clp->cl_cb_conn; 985 unsigned short expected_family; 986 987 /* Currently, we only support tcp and tcp6 for the callback channel */ 988 if (se->se_callback_netid_len == 3 && 989 !memcmp(se->se_callback_netid_val, "tcp", 3)) 990 expected_family = AF_INET; 991 else if (se->se_callback_netid_len == 4 && 992 !memcmp(se->se_callback_netid_val, "tcp6", 4)) 993 expected_family = AF_INET6; 994 else 995 goto out_err; 996 997 cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val, 998 se->se_callback_addr_len, 999 (struct sockaddr *) &cb->cb_addr, 1000 sizeof(cb->cb_addr)); 1001 1002 if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family) 1003 goto out_err; 1004 1005 if (cb->cb_addr.ss_family == AF_INET6) 1006 ((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid; 1007 1008 cb->cb_minorversion = 0; 1009 cb->cb_prog = se->se_callback_prog; 1010 cb->cb_ident = se->se_callback_ident; 1011 return; 1012 out_err: 1013 cb->cb_addr.ss_family = AF_UNSPEC; 1014 cb->cb_addrlen = 0; 1015 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 1016 "will not receive delegations\n", 1017 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 1018 1019 return; 1020 } 1021 1022 /* 1023 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size. 1024 */ 1025 void 1026 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) 1027 { 1028 struct nfsd4_slot *slot = resp->cstate.slot; 1029 unsigned int base; 1030 1031 dprintk("--> %s slot %p\n", __func__, slot); 1032 1033 slot->sl_opcnt = resp->opcnt; 1034 slot->sl_status = resp->cstate.status; 1035 1036 if (nfsd4_not_cached(resp)) { 1037 slot->sl_datalen = 0; 1038 return; 1039 } 1040 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap; 1041 base = (char *)resp->cstate.datap - 1042 (char *)resp->xbuf->head[0].iov_base; 1043 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data, 1044 slot->sl_datalen)) 1045 WARN("%s: sessions DRC could not cache compound\n", __func__); 1046 return; 1047 } 1048 1049 /* 1050 * Encode the replay sequence operation from the slot values. 1051 * If cachethis is FALSE encode the uncached rep error on the next 1052 * operation which sets resp->p and increments resp->opcnt for 1053 * nfs4svc_encode_compoundres. 1054 * 1055 */ 1056 static __be32 1057 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, 1058 struct nfsd4_compoundres *resp) 1059 { 1060 struct nfsd4_op *op; 1061 struct nfsd4_slot *slot = resp->cstate.slot; 1062 1063 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__, 1064 resp->opcnt, resp->cstate.slot->sl_cachethis); 1065 1066 /* Encode the replayed sequence operation */ 1067 op = &args->ops[resp->opcnt - 1]; 1068 nfsd4_encode_operation(resp, op); 1069 1070 /* Return nfserr_retry_uncached_rep in next operation. */ 1071 if (args->opcnt > 1 && slot->sl_cachethis == 0) { 1072 op = &args->ops[resp->opcnt++]; 1073 op->status = nfserr_retry_uncached_rep; 1074 nfsd4_encode_operation(resp, op); 1075 } 1076 return op->status; 1077 } 1078 1079 /* 1080 * The sequence operation is not cached because we can use the slot and 1081 * session values. 1082 */ 1083 __be32 1084 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, 1085 struct nfsd4_sequence *seq) 1086 { 1087 struct nfsd4_slot *slot = resp->cstate.slot; 1088 __be32 status; 1089 1090 dprintk("--> %s slot %p\n", __func__, slot); 1091 1092 /* Either returns 0 or nfserr_retry_uncached */ 1093 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); 1094 if (status == nfserr_retry_uncached_rep) 1095 return status; 1096 1097 /* The sequence operation has been encoded, cstate->datap set. */ 1098 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen); 1099 1100 resp->opcnt = slot->sl_opcnt; 1101 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen); 1102 status = slot->sl_status; 1103 1104 return status; 1105 } 1106 1107 /* 1108 * Set the exchange_id flags returned by the server. 1109 */ 1110 static void 1111 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) 1112 { 1113 /* pNFS is not supported */ 1114 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; 1115 1116 /* Referrals are supported, Migration is not. */ 1117 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; 1118 1119 /* set the wire flags to return to client. */ 1120 clid->flags = new->cl_exchange_flags; 1121 } 1122 1123 __be32 1124 nfsd4_exchange_id(struct svc_rqst *rqstp, 1125 struct nfsd4_compound_state *cstate, 1126 struct nfsd4_exchange_id *exid) 1127 { 1128 struct nfs4_client *unconf, *conf, *new; 1129 int status; 1130 unsigned int strhashval; 1131 char dname[HEXDIR_LEN]; 1132 char addr_str[INET6_ADDRSTRLEN]; 1133 nfs4_verifier verf = exid->verifier; 1134 struct sockaddr *sa = svc_addr(rqstp); 1135 1136 rpc_ntop(sa, addr_str, sizeof(addr_str)); 1137 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " 1138 "ip_addr=%s flags %x, spa_how %d\n", 1139 __func__, rqstp, exid, exid->clname.len, exid->clname.data, 1140 addr_str, exid->flags, exid->spa_how); 1141 1142 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A)) 1143 return nfserr_inval; 1144 1145 /* Currently only support SP4_NONE */ 1146 switch (exid->spa_how) { 1147 case SP4_NONE: 1148 break; 1149 case SP4_SSV: 1150 return nfserr_encr_alg_unsupp; 1151 default: 1152 BUG(); /* checked by xdr code */ 1153 case SP4_MACH_CRED: 1154 return nfserr_serverfault; /* no excuse :-/ */ 1155 } 1156 1157 status = nfs4_make_rec_clidname(dname, &exid->clname); 1158 1159 if (status) 1160 goto error; 1161 1162 strhashval = clientstr_hashval(dname); 1163 1164 nfs4_lock_state(); 1165 status = nfs_ok; 1166 1167 conf = find_confirmed_client_by_str(dname, strhashval, true); 1168 if (conf) { 1169 if (!same_verf(&verf, &conf->cl_verifier)) { 1170 /* 18.35.4 case 8 */ 1171 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1172 status = nfserr_not_same; 1173 goto out; 1174 } 1175 /* Client reboot: destroy old state */ 1176 expire_client(conf); 1177 goto out_new; 1178 } 1179 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 1180 /* 18.35.4 case 9 */ 1181 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1182 status = nfserr_perm; 1183 goto out; 1184 } 1185 expire_client(conf); 1186 goto out_new; 1187 } 1188 /* 1189 * Set bit when the owner id and verifier map to an already 1190 * confirmed client id (18.35.3). 1191 */ 1192 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; 1193 1194 /* 1195 * Falling into 18.35.4 case 2, possible router replay. 1196 * Leave confirmed record intact and return same result. 1197 */ 1198 copy_verf(conf, &verf); 1199 new = conf; 1200 goto out_copy; 1201 } 1202 1203 /* 18.35.4 case 7 */ 1204 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1205 status = nfserr_noent; 1206 goto out; 1207 } 1208 1209 unconf = find_unconfirmed_client_by_str(dname, strhashval, true); 1210 if (unconf) { 1211 /* 1212 * Possible retry or client restart. Per 18.35.4 case 4, 1213 * a new unconfirmed record should be generated regardless 1214 * of whether any properties have changed. 1215 */ 1216 expire_client(unconf); 1217 } 1218 1219 out_new: 1220 /* Normal case */ 1221 new = create_client(exid->clname, dname, rqstp, &verf); 1222 if (new == NULL) { 1223 status = nfserr_serverfault; 1224 goto out; 1225 } 1226 1227 gen_clid(new); 1228 add_to_unconfirmed(new, strhashval); 1229 out_copy: 1230 exid->clientid.cl_boot = new->cl_clientid.cl_boot; 1231 exid->clientid.cl_id = new->cl_clientid.cl_id; 1232 1233 exid->seqid = 1; 1234 nfsd4_set_ex_flags(new, exid); 1235 1236 dprintk("nfsd4_exchange_id seqid %d flags %x\n", 1237 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags); 1238 status = nfs_ok; 1239 1240 out: 1241 nfs4_unlock_state(); 1242 error: 1243 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status)); 1244 return status; 1245 } 1246 1247 static int 1248 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) 1249 { 1250 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, 1251 slot_seqid); 1252 1253 /* The slot is in use, and no response has been sent. */ 1254 if (slot_inuse) { 1255 if (seqid == slot_seqid) 1256 return nfserr_jukebox; 1257 else 1258 return nfserr_seq_misordered; 1259 } 1260 /* Normal */ 1261 if (likely(seqid == slot_seqid + 1)) 1262 return nfs_ok; 1263 /* Replay */ 1264 if (seqid == slot_seqid) 1265 return nfserr_replay_cache; 1266 /* Wraparound */ 1267 if (seqid == 1 && (slot_seqid + 1) == 0) 1268 return nfs_ok; 1269 /* Misordered replay or misordered new request */ 1270 return nfserr_seq_misordered; 1271 } 1272 1273 /* 1274 * Cache the create session result into the create session single DRC 1275 * slot cache by saving the xdr structure. sl_seqid has been set. 1276 * Do this for solo or embedded create session operations. 1277 */ 1278 static void 1279 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, 1280 struct nfsd4_clid_slot *slot, int nfserr) 1281 { 1282 slot->sl_status = nfserr; 1283 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); 1284 } 1285 1286 static __be32 1287 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, 1288 struct nfsd4_clid_slot *slot) 1289 { 1290 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); 1291 return slot->sl_status; 1292 } 1293 1294 __be32 1295 nfsd4_create_session(struct svc_rqst *rqstp, 1296 struct nfsd4_compound_state *cstate, 1297 struct nfsd4_create_session *cr_ses) 1298 { 1299 struct sockaddr *sa = svc_addr(rqstp); 1300 struct nfs4_client *conf, *unconf; 1301 struct nfsd4_clid_slot *cs_slot = NULL; 1302 int status = 0; 1303 1304 nfs4_lock_state(); 1305 unconf = find_unconfirmed_client(&cr_ses->clientid); 1306 conf = find_confirmed_client(&cr_ses->clientid); 1307 1308 if (conf) { 1309 cs_slot = &conf->cl_cs_slot; 1310 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 1311 if (status == nfserr_replay_cache) { 1312 dprintk("Got a create_session replay! seqid= %d\n", 1313 cs_slot->sl_seqid); 1314 /* Return the cached reply status */ 1315 status = nfsd4_replay_create_session(cr_ses, cs_slot); 1316 goto out; 1317 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) { 1318 status = nfserr_seq_misordered; 1319 dprintk("Sequence misordered!\n"); 1320 dprintk("Expected seqid= %d but got seqid= %d\n", 1321 cs_slot->sl_seqid, cr_ses->seqid); 1322 goto out; 1323 } 1324 cs_slot->sl_seqid++; 1325 } else if (unconf) { 1326 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || 1327 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { 1328 status = nfserr_clid_inuse; 1329 goto out; 1330 } 1331 1332 cs_slot = &unconf->cl_cs_slot; 1333 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 1334 if (status) { 1335 /* an unconfirmed replay returns misordered */ 1336 status = nfserr_seq_misordered; 1337 goto out_cache; 1338 } 1339 1340 cs_slot->sl_seqid++; /* from 0 to 1 */ 1341 move_to_confirmed(unconf); 1342 1343 if (cr_ses->flags & SESSION4_BACK_CHAN) { 1344 unconf->cl_cb_conn.cb_xprt = rqstp->rq_xprt; 1345 svc_xprt_get(rqstp->rq_xprt); 1346 rpc_copy_addr( 1347 (struct sockaddr *)&unconf->cl_cb_conn.cb_addr, 1348 sa); 1349 unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa); 1350 unconf->cl_cb_conn.cb_minorversion = 1351 cstate->minorversion; 1352 unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog; 1353 unconf->cl_cb_seq_nr = 1; 1354 nfsd4_probe_callback(unconf, &unconf->cl_cb_conn); 1355 } 1356 conf = unconf; 1357 } else { 1358 status = nfserr_stale_clientid; 1359 goto out; 1360 } 1361 1362 /* 1363 * We do not support RDMA or persistent sessions 1364 */ 1365 cr_ses->flags &= ~SESSION4_PERSIST; 1366 cr_ses->flags &= ~SESSION4_RDMA; 1367 1368 status = alloc_init_session(rqstp, conf, cr_ses); 1369 if (status) 1370 goto out; 1371 1372 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data, 1373 NFS4_MAX_SESSIONID_LEN); 1374 cr_ses->seqid = cs_slot->sl_seqid; 1375 1376 out_cache: 1377 /* cache solo and embedded create sessions under the state lock */ 1378 nfsd4_cache_create_session(cr_ses, cs_slot, status); 1379 out: 1380 nfs4_unlock_state(); 1381 dprintk("%s returns %d\n", __func__, ntohl(status)); 1382 return status; 1383 } 1384 1385 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp) 1386 { 1387 struct nfsd4_compoundres *resp = rqstp->rq_resp; 1388 struct nfsd4_compoundargs *argp = rqstp->rq_argp; 1389 1390 return argp->opcnt == resp->opcnt; 1391 } 1392 1393 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) 1394 { 1395 if (!session) 1396 return 0; 1397 return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); 1398 } 1399 1400 __be32 1401 nfsd4_destroy_session(struct svc_rqst *r, 1402 struct nfsd4_compound_state *cstate, 1403 struct nfsd4_destroy_session *sessionid) 1404 { 1405 struct nfsd4_session *ses; 1406 u32 status = nfserr_badsession; 1407 1408 /* Notes: 1409 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid 1410 * - Should we return nfserr_back_chan_busy if waiting for 1411 * callbacks on to-be-destroyed session? 1412 * - Do we need to clear any callback info from previous session? 1413 */ 1414 1415 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { 1416 if (!nfsd4_last_compound_op(r)) 1417 return nfserr_not_only_op; 1418 } 1419 dump_sessionid(__func__, &sessionid->sessionid); 1420 spin_lock(&client_lock); 1421 ses = find_in_sessionid_hashtbl(&sessionid->sessionid); 1422 if (!ses) { 1423 spin_unlock(&client_lock); 1424 goto out; 1425 } 1426 1427 unhash_session(ses); 1428 spin_unlock(&client_lock); 1429 1430 nfs4_lock_state(); 1431 /* wait for callbacks */ 1432 nfsd4_set_callback_client(ses->se_client, NULL); 1433 nfs4_unlock_state(); 1434 nfsd4_put_session(ses); 1435 status = nfs_ok; 1436 out: 1437 dprintk("%s returns %d\n", __func__, ntohl(status)); 1438 return status; 1439 } 1440 1441 __be32 1442 nfsd4_sequence(struct svc_rqst *rqstp, 1443 struct nfsd4_compound_state *cstate, 1444 struct nfsd4_sequence *seq) 1445 { 1446 struct nfsd4_compoundres *resp = rqstp->rq_resp; 1447 struct nfsd4_session *session; 1448 struct nfsd4_slot *slot; 1449 int status; 1450 1451 if (resp->opcnt != 1) 1452 return nfserr_sequence_pos; 1453 1454 spin_lock(&client_lock); 1455 status = nfserr_badsession; 1456 session = find_in_sessionid_hashtbl(&seq->sessionid); 1457 if (!session) 1458 goto out; 1459 1460 status = nfserr_badslot; 1461 if (seq->slotid >= session->se_fchannel.maxreqs) 1462 goto out; 1463 1464 slot = session->se_slots[seq->slotid]; 1465 dprintk("%s: slotid %d\n", __func__, seq->slotid); 1466 1467 /* We do not negotiate the number of slots yet, so set the 1468 * maxslots to the session maxreqs which is used to encode 1469 * sr_highest_slotid and the sr_target_slot id to maxslots */ 1470 seq->maxslots = session->se_fchannel.maxreqs; 1471 1472 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse); 1473 if (status == nfserr_replay_cache) { 1474 cstate->slot = slot; 1475 cstate->session = session; 1476 /* Return the cached reply status and set cstate->status 1477 * for nfsd4_proc_compound processing */ 1478 status = nfsd4_replay_cache_entry(resp, seq); 1479 cstate->status = nfserr_replay_cache; 1480 goto out; 1481 } 1482 if (status) 1483 goto out; 1484 1485 /* Success! bump slot seqid */ 1486 slot->sl_inuse = true; 1487 slot->sl_seqid = seq->seqid; 1488 slot->sl_cachethis = seq->cachethis; 1489 1490 cstate->slot = slot; 1491 cstate->session = session; 1492 1493 out: 1494 /* Hold a session reference until done processing the compound. */ 1495 if (cstate->session) { 1496 nfsd4_get_session(cstate->session); 1497 atomic_inc(&session->se_client->cl_refcount); 1498 } 1499 spin_unlock(&client_lock); 1500 dprintk("%s: return %d\n", __func__, ntohl(status)); 1501 return status; 1502 } 1503 1504 __be32 1505 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc) 1506 { 1507 if (rc->rca_one_fs) { 1508 if (!cstate->current_fh.fh_dentry) 1509 return nfserr_nofilehandle; 1510 /* 1511 * We don't take advantage of the rca_one_fs case. 1512 * That's OK, it's optional, we can safely ignore it. 1513 */ 1514 return nfs_ok; 1515 } 1516 nfs4_lock_state(); 1517 if (is_client_expired(cstate->session->se_client)) { 1518 nfs4_unlock_state(); 1519 /* 1520 * The following error isn't really legal. 1521 * But we only get here if the client just explicitly 1522 * destroyed the client. Surely it no longer cares what 1523 * error it gets back on an operation for the dead 1524 * client. 1525 */ 1526 return nfserr_stale_clientid; 1527 } 1528 nfsd4_create_clid_dir(cstate->session->se_client); 1529 nfs4_unlock_state(); 1530 return nfs_ok; 1531 } 1532 1533 __be32 1534 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 1535 struct nfsd4_setclientid *setclid) 1536 { 1537 struct sockaddr *sa = svc_addr(rqstp); 1538 struct xdr_netobj clname = { 1539 .len = setclid->se_namelen, 1540 .data = setclid->se_name, 1541 }; 1542 nfs4_verifier clverifier = setclid->se_verf; 1543 unsigned int strhashval; 1544 struct nfs4_client *conf, *unconf, *new; 1545 __be32 status; 1546 char dname[HEXDIR_LEN]; 1547 1548 if (!check_name(clname)) 1549 return nfserr_inval; 1550 1551 status = nfs4_make_rec_clidname(dname, &clname); 1552 if (status) 1553 return status; 1554 1555 /* 1556 * XXX The Duplicate Request Cache (DRC) has been checked (??) 1557 * We get here on a DRC miss. 1558 */ 1559 1560 strhashval = clientstr_hashval(dname); 1561 1562 nfs4_lock_state(); 1563 conf = find_confirmed_client_by_str(dname, strhashval, false); 1564 if (conf) { 1565 /* RFC 3530 14.2.33 CASE 0: */ 1566 status = nfserr_clid_inuse; 1567 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 1568 char addr_str[INET6_ADDRSTRLEN]; 1569 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, 1570 sizeof(addr_str)); 1571 dprintk("NFSD: setclientid: string in use by client " 1572 "at %s\n", addr_str); 1573 goto out; 1574 } 1575 } 1576 /* 1577 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION") 1578 * has a description of SETCLIENTID request processing consisting 1579 * of 5 bullet points, labeled as CASE0 - CASE4 below. 1580 */ 1581 unconf = find_unconfirmed_client_by_str(dname, strhashval, false); 1582 status = nfserr_resource; 1583 if (!conf) { 1584 /* 1585 * RFC 3530 14.2.33 CASE 4: 1586 * placed first, because it is the normal case 1587 */ 1588 if (unconf) 1589 expire_client(unconf); 1590 new = create_client(clname, dname, rqstp, &clverifier); 1591 if (new == NULL) 1592 goto out; 1593 gen_clid(new); 1594 } else if (same_verf(&conf->cl_verifier, &clverifier)) { 1595 /* 1596 * RFC 3530 14.2.33 CASE 1: 1597 * probable callback update 1598 */ 1599 if (unconf) { 1600 /* Note this is removing unconfirmed {*x***}, 1601 * which is stronger than RFC recommended {vxc**}. 1602 * This has the advantage that there is at most 1603 * one {*x***} in either list at any time. 1604 */ 1605 expire_client(unconf); 1606 } 1607 new = create_client(clname, dname, rqstp, &clverifier); 1608 if (new == NULL) 1609 goto out; 1610 copy_clid(new, conf); 1611 } else if (!unconf) { 1612 /* 1613 * RFC 3530 14.2.33 CASE 2: 1614 * probable client reboot; state will be removed if 1615 * confirmed. 1616 */ 1617 new = create_client(clname, dname, rqstp, &clverifier); 1618 if (new == NULL) 1619 goto out; 1620 gen_clid(new); 1621 } else { 1622 /* 1623 * RFC 3530 14.2.33 CASE 3: 1624 * probable client reboot; state will be removed if 1625 * confirmed. 1626 */ 1627 expire_client(unconf); 1628 new = create_client(clname, dname, rqstp, &clverifier); 1629 if (new == NULL) 1630 goto out; 1631 gen_clid(new); 1632 } 1633 gen_callback(new, setclid, rpc_get_scope_id(sa)); 1634 add_to_unconfirmed(new, strhashval); 1635 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 1636 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 1637 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 1638 status = nfs_ok; 1639 out: 1640 nfs4_unlock_state(); 1641 return status; 1642 } 1643 1644 1645 /* 1646 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has 1647 * a description of SETCLIENTID_CONFIRM request processing consisting of 4 1648 * bullets, labeled as CASE1 - CASE4 below. 1649 */ 1650 __be32 1651 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 1652 struct nfsd4_compound_state *cstate, 1653 struct nfsd4_setclientid_confirm *setclientid_confirm) 1654 { 1655 struct sockaddr *sa = svc_addr(rqstp); 1656 struct nfs4_client *conf, *unconf; 1657 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 1658 clientid_t * clid = &setclientid_confirm->sc_clientid; 1659 __be32 status; 1660 1661 if (STALE_CLIENTID(clid)) 1662 return nfserr_stale_clientid; 1663 /* 1664 * XXX The Duplicate Request Cache (DRC) has been checked (??) 1665 * We get here on a DRC miss. 1666 */ 1667 1668 nfs4_lock_state(); 1669 1670 conf = find_confirmed_client(clid); 1671 unconf = find_unconfirmed_client(clid); 1672 1673 status = nfserr_clid_inuse; 1674 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa)) 1675 goto out; 1676 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa)) 1677 goto out; 1678 1679 /* 1680 * section 14.2.34 of RFC 3530 has a description of 1681 * SETCLIENTID_CONFIRM request processing consisting 1682 * of 4 bullet points, labeled as CASE1 - CASE4 below. 1683 */ 1684 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) { 1685 /* 1686 * RFC 3530 14.2.34 CASE 1: 1687 * callback update 1688 */ 1689 if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) 1690 status = nfserr_clid_inuse; 1691 else { 1692 atomic_set(&conf->cl_cb_set, 0); 1693 nfsd4_probe_callback(conf, &unconf->cl_cb_conn); 1694 expire_client(unconf); 1695 status = nfs_ok; 1696 1697 } 1698 } else if (conf && !unconf) { 1699 /* 1700 * RFC 3530 14.2.34 CASE 2: 1701 * probable retransmitted request; play it safe and 1702 * do nothing. 1703 */ 1704 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) 1705 status = nfserr_clid_inuse; 1706 else 1707 status = nfs_ok; 1708 } else if (!conf && unconf 1709 && same_verf(&unconf->cl_confirm, &confirm)) { 1710 /* 1711 * RFC 3530 14.2.34 CASE 3: 1712 * Normal case; new or rebooted client: 1713 */ 1714 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 1715 status = nfserr_clid_inuse; 1716 } else { 1717 unsigned int hash = 1718 clientstr_hashval(unconf->cl_recdir); 1719 conf = find_confirmed_client_by_str(unconf->cl_recdir, 1720 hash, false); 1721 if (conf) { 1722 nfsd4_remove_clid_dir(conf); 1723 expire_client(conf); 1724 } 1725 move_to_confirmed(unconf); 1726 conf = unconf; 1727 nfsd4_probe_callback(conf, &conf->cl_cb_conn); 1728 status = nfs_ok; 1729 } 1730 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) 1731 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, 1732 &confirm)))) { 1733 /* 1734 * RFC 3530 14.2.34 CASE 4: 1735 * Client probably hasn't noticed that we rebooted yet. 1736 */ 1737 status = nfserr_stale_clientid; 1738 } else { 1739 /* check that we have hit one of the cases...*/ 1740 status = nfserr_clid_inuse; 1741 } 1742 out: 1743 nfs4_unlock_state(); 1744 return status; 1745 } 1746 1747 /* OPEN Share state helper functions */ 1748 static inline struct nfs4_file * 1749 alloc_init_file(struct inode *ino) 1750 { 1751 struct nfs4_file *fp; 1752 unsigned int hashval = file_hashval(ino); 1753 1754 fp = kmem_cache_alloc(file_slab, GFP_KERNEL); 1755 if (fp) { 1756 atomic_set(&fp->fi_ref, 1); 1757 INIT_LIST_HEAD(&fp->fi_hash); 1758 INIT_LIST_HEAD(&fp->fi_stateids); 1759 INIT_LIST_HEAD(&fp->fi_delegations); 1760 fp->fi_inode = igrab(ino); 1761 fp->fi_id = current_fileid++; 1762 fp->fi_had_conflict = false; 1763 spin_lock(&recall_lock); 1764 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 1765 spin_unlock(&recall_lock); 1766 return fp; 1767 } 1768 return NULL; 1769 } 1770 1771 static void 1772 nfsd4_free_slab(struct kmem_cache **slab) 1773 { 1774 if (*slab == NULL) 1775 return; 1776 kmem_cache_destroy(*slab); 1777 *slab = NULL; 1778 } 1779 1780 void 1781 nfsd4_free_slabs(void) 1782 { 1783 nfsd4_free_slab(&stateowner_slab); 1784 nfsd4_free_slab(&file_slab); 1785 nfsd4_free_slab(&stateid_slab); 1786 nfsd4_free_slab(&deleg_slab); 1787 } 1788 1789 static int 1790 nfsd4_init_slabs(void) 1791 { 1792 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 1793 sizeof(struct nfs4_stateowner), 0, 0, NULL); 1794 if (stateowner_slab == NULL) 1795 goto out_nomem; 1796 file_slab = kmem_cache_create("nfsd4_files", 1797 sizeof(struct nfs4_file), 0, 0, NULL); 1798 if (file_slab == NULL) 1799 goto out_nomem; 1800 stateid_slab = kmem_cache_create("nfsd4_stateids", 1801 sizeof(struct nfs4_stateid), 0, 0, NULL); 1802 if (stateid_slab == NULL) 1803 goto out_nomem; 1804 deleg_slab = kmem_cache_create("nfsd4_delegations", 1805 sizeof(struct nfs4_delegation), 0, 0, NULL); 1806 if (deleg_slab == NULL) 1807 goto out_nomem; 1808 return 0; 1809 out_nomem: 1810 nfsd4_free_slabs(); 1811 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 1812 return -ENOMEM; 1813 } 1814 1815 void 1816 nfs4_free_stateowner(struct kref *kref) 1817 { 1818 struct nfs4_stateowner *sop = 1819 container_of(kref, struct nfs4_stateowner, so_ref); 1820 kfree(sop->so_owner.data); 1821 kmem_cache_free(stateowner_slab, sop); 1822 } 1823 1824 static inline struct nfs4_stateowner * 1825 alloc_stateowner(struct xdr_netobj *owner) 1826 { 1827 struct nfs4_stateowner *sop; 1828 1829 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 1830 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 1831 memcpy(sop->so_owner.data, owner->data, owner->len); 1832 sop->so_owner.len = owner->len; 1833 kref_init(&sop->so_ref); 1834 return sop; 1835 } 1836 kmem_cache_free(stateowner_slab, sop); 1837 } 1838 return NULL; 1839 } 1840 1841 static struct nfs4_stateowner * 1842 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 1843 struct nfs4_stateowner *sop; 1844 struct nfs4_replay *rp; 1845 unsigned int idhashval; 1846 1847 if (!(sop = alloc_stateowner(&open->op_owner))) 1848 return NULL; 1849 idhashval = ownerid_hashval(current_ownerid); 1850 INIT_LIST_HEAD(&sop->so_idhash); 1851 INIT_LIST_HEAD(&sop->so_strhash); 1852 INIT_LIST_HEAD(&sop->so_perclient); 1853 INIT_LIST_HEAD(&sop->so_stateids); 1854 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ 1855 INIT_LIST_HEAD(&sop->so_close_lru); 1856 sop->so_time = 0; 1857 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 1858 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 1859 list_add(&sop->so_perclient, &clp->cl_openowners); 1860 sop->so_is_open_owner = 1; 1861 sop->so_id = current_ownerid++; 1862 sop->so_client = clp; 1863 sop->so_seqid = open->op_seqid; 1864 sop->so_confirmed = 0; 1865 rp = &sop->so_replay; 1866 rp->rp_status = nfserr_serverfault; 1867 rp->rp_buflen = 0; 1868 rp->rp_buf = rp->rp_ibuf; 1869 return sop; 1870 } 1871 1872 static inline void 1873 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 1874 struct nfs4_stateowner *sop = open->op_stateowner; 1875 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 1876 1877 INIT_LIST_HEAD(&stp->st_hash); 1878 INIT_LIST_HEAD(&stp->st_perstateowner); 1879 INIT_LIST_HEAD(&stp->st_lockowners); 1880 INIT_LIST_HEAD(&stp->st_perfile); 1881 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 1882 list_add(&stp->st_perstateowner, &sop->so_stateids); 1883 list_add(&stp->st_perfile, &fp->fi_stateids); 1884 stp->st_stateowner = sop; 1885 get_nfs4_file(fp); 1886 stp->st_file = fp; 1887 stp->st_stateid.si_boot = boot_time; 1888 stp->st_stateid.si_stateownerid = sop->so_id; 1889 stp->st_stateid.si_fileid = fp->fi_id; 1890 stp->st_stateid.si_generation = 0; 1891 stp->st_access_bmap = 0; 1892 stp->st_deny_bmap = 0; 1893 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK, 1894 &stp->st_access_bmap); 1895 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 1896 stp->st_openstp = NULL; 1897 } 1898 1899 static void 1900 move_to_close_lru(struct nfs4_stateowner *sop) 1901 { 1902 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 1903 1904 list_move_tail(&sop->so_close_lru, &close_lru); 1905 sop->so_time = get_seconds(); 1906 } 1907 1908 static int 1909 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, 1910 clientid_t *clid) 1911 { 1912 return (sop->so_owner.len == owner->len) && 1913 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && 1914 (sop->so_client->cl_clientid.cl_id == clid->cl_id); 1915 } 1916 1917 static struct nfs4_stateowner * 1918 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) 1919 { 1920 struct nfs4_stateowner *so = NULL; 1921 1922 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { 1923 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) 1924 return so; 1925 } 1926 return NULL; 1927 } 1928 1929 /* search file_hashtbl[] for file */ 1930 static struct nfs4_file * 1931 find_file(struct inode *ino) 1932 { 1933 unsigned int hashval = file_hashval(ino); 1934 struct nfs4_file *fp; 1935 1936 spin_lock(&recall_lock); 1937 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { 1938 if (fp->fi_inode == ino) { 1939 get_nfs4_file(fp); 1940 spin_unlock(&recall_lock); 1941 return fp; 1942 } 1943 } 1944 spin_unlock(&recall_lock); 1945 return NULL; 1946 } 1947 1948 static inline int access_valid(u32 x, u32 minorversion) 1949 { 1950 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ) 1951 return 0; 1952 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH) 1953 return 0; 1954 x &= ~NFS4_SHARE_ACCESS_MASK; 1955 if (minorversion && x) { 1956 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL) 1957 return 0; 1958 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED) 1959 return 0; 1960 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK); 1961 } 1962 if (x) 1963 return 0; 1964 return 1; 1965 } 1966 1967 static inline int deny_valid(u32 x) 1968 { 1969 /* Note: unlike access bits, deny bits may be zero. */ 1970 return x <= NFS4_SHARE_DENY_BOTH; 1971 } 1972 1973 /* 1974 * We store the NONE, READ, WRITE, and BOTH bits separately in the 1975 * st_{access,deny}_bmap field of the stateid, in order to track not 1976 * only what share bits are currently in force, but also what 1977 * combinations of share bits previous opens have used. This allows us 1978 * to enforce the recommendation of rfc 3530 14.2.19 that the server 1979 * return an error if the client attempt to downgrade to a combination 1980 * of share bits not explicable by closing some of its previous opens. 1981 * 1982 * XXX: This enforcement is actually incomplete, since we don't keep 1983 * track of access/deny bit combinations; so, e.g., we allow: 1984 * 1985 * OPEN allow read, deny write 1986 * OPEN allow both, deny none 1987 * DOWNGRADE allow read, deny none 1988 * 1989 * which we should reject. 1990 */ 1991 static void 1992 set_access(unsigned int *access, unsigned long bmap) { 1993 int i; 1994 1995 *access = 0; 1996 for (i = 1; i < 4; i++) { 1997 if (test_bit(i, &bmap)) 1998 *access |= i; 1999 } 2000 } 2001 2002 static void 2003 set_deny(unsigned int *deny, unsigned long bmap) { 2004 int i; 2005 2006 *deny = 0; 2007 for (i = 0; i < 4; i++) { 2008 if (test_bit(i, &bmap)) 2009 *deny |= i ; 2010 } 2011 } 2012 2013 static int 2014 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 2015 unsigned int access, deny; 2016 2017 set_access(&access, stp->st_access_bmap); 2018 set_deny(&deny, stp->st_deny_bmap); 2019 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 2020 return 0; 2021 return 1; 2022 } 2023 2024 /* 2025 * Called to check deny when READ with all zero stateid or 2026 * WRITE with all zero or all one stateid 2027 */ 2028 static __be32 2029 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 2030 { 2031 struct inode *ino = current_fh->fh_dentry->d_inode; 2032 struct nfs4_file *fp; 2033 struct nfs4_stateid *stp; 2034 __be32 ret; 2035 2036 dprintk("NFSD: nfs4_share_conflict\n"); 2037 2038 fp = find_file(ino); 2039 if (!fp) 2040 return nfs_ok; 2041 ret = nfserr_locked; 2042 /* Search for conflicting share reservations */ 2043 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { 2044 if (test_bit(deny_type, &stp->st_deny_bmap) || 2045 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 2046 goto out; 2047 } 2048 ret = nfs_ok; 2049 out: 2050 put_nfs4_file(fp); 2051 return ret; 2052 } 2053 2054 static inline void 2055 nfs4_file_downgrade(struct file *filp, unsigned int share_access) 2056 { 2057 if (share_access & NFS4_SHARE_ACCESS_WRITE) { 2058 drop_file_write_access(filp); 2059 spin_lock(&filp->f_lock); 2060 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; 2061 spin_unlock(&filp->f_lock); 2062 } 2063 } 2064 2065 /* 2066 * Spawn a thread to perform a recall on the delegation represented 2067 * by the lease (file_lock) 2068 * 2069 * Called from break_lease() with lock_kernel() held. 2070 * Note: we assume break_lease will only call this *once* for any given 2071 * lease. 2072 */ 2073 static 2074 void nfsd_break_deleg_cb(struct file_lock *fl) 2075 { 2076 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 2077 2078 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 2079 if (!dp) 2080 return; 2081 2082 /* We're assuming the state code never drops its reference 2083 * without first removing the lease. Since we're in this lease 2084 * callback (and since the lease code is serialized by the kernel 2085 * lock) we know the server hasn't removed the lease yet, we know 2086 * it's safe to take a reference: */ 2087 atomic_inc(&dp->dl_count); 2088 2089 spin_lock(&recall_lock); 2090 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 2091 spin_unlock(&recall_lock); 2092 2093 /* only place dl_time is set. protected by lock_kernel*/ 2094 dp->dl_time = get_seconds(); 2095 2096 /* 2097 * We don't want the locks code to timeout the lease for us; 2098 * we'll remove it ourself if the delegation isn't returned 2099 * in time. 2100 */ 2101 fl->fl_break_time = 0; 2102 2103 dp->dl_file->fi_had_conflict = true; 2104 nfsd4_cb_recall(dp); 2105 } 2106 2107 /* 2108 * The file_lock is being reapd. 2109 * 2110 * Called by locks_free_lock() with lock_kernel() held. 2111 */ 2112 static 2113 void nfsd_release_deleg_cb(struct file_lock *fl) 2114 { 2115 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 2116 2117 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count)); 2118 2119 if (!(fl->fl_flags & FL_LEASE) || !dp) 2120 return; 2121 dp->dl_flock = NULL; 2122 } 2123 2124 /* 2125 * Set the delegation file_lock back pointer. 2126 * 2127 * Called from setlease() with lock_kernel() held. 2128 */ 2129 static 2130 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl) 2131 { 2132 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner; 2133 2134 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp); 2135 if (!dp) 2136 return; 2137 dp->dl_flock = new; 2138 } 2139 2140 /* 2141 * Called from setlease() with lock_kernel() held 2142 */ 2143 static 2144 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) 2145 { 2146 struct nfs4_delegation *onlistd = 2147 (struct nfs4_delegation *)onlist->fl_owner; 2148 struct nfs4_delegation *tryd = 2149 (struct nfs4_delegation *)try->fl_owner; 2150 2151 if (onlist->fl_lmops != try->fl_lmops) 2152 return 0; 2153 2154 return onlistd->dl_client == tryd->dl_client; 2155 } 2156 2157 2158 static 2159 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) 2160 { 2161 if (arg & F_UNLCK) 2162 return lease_modify(onlist, arg); 2163 else 2164 return -EAGAIN; 2165 } 2166 2167 static const struct lock_manager_operations nfsd_lease_mng_ops = { 2168 .fl_break = nfsd_break_deleg_cb, 2169 .fl_release_private = nfsd_release_deleg_cb, 2170 .fl_copy_lock = nfsd_copy_lock_deleg_cb, 2171 .fl_mylease = nfsd_same_client_deleg_cb, 2172 .fl_change = nfsd_change_deleg_cb, 2173 }; 2174 2175 2176 __be32 2177 nfsd4_process_open1(struct nfsd4_compound_state *cstate, 2178 struct nfsd4_open *open) 2179 { 2180 clientid_t *clientid = &open->op_clientid; 2181 struct nfs4_client *clp = NULL; 2182 unsigned int strhashval; 2183 struct nfs4_stateowner *sop = NULL; 2184 2185 if (!check_name(open->op_owner)) 2186 return nfserr_inval; 2187 2188 if (STALE_CLIENTID(&open->op_clientid)) 2189 return nfserr_stale_clientid; 2190 2191 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); 2192 sop = find_openstateowner_str(strhashval, open); 2193 open->op_stateowner = sop; 2194 if (!sop) { 2195 /* Make sure the client's lease hasn't expired. */ 2196 clp = find_confirmed_client(clientid); 2197 if (clp == NULL) 2198 return nfserr_expired; 2199 goto renew; 2200 } 2201 /* When sessions are used, skip open sequenceid processing */ 2202 if (nfsd4_has_session(cstate)) 2203 goto renew; 2204 if (!sop->so_confirmed) { 2205 /* Replace unconfirmed owners without checking for replay. */ 2206 clp = sop->so_client; 2207 release_openowner(sop); 2208 open->op_stateowner = NULL; 2209 goto renew; 2210 } 2211 if (open->op_seqid == sop->so_seqid - 1) { 2212 if (sop->so_replay.rp_buflen) 2213 return nfserr_replay_me; 2214 /* The original OPEN failed so spectacularly 2215 * that we don't even have replay data saved! 2216 * Therefore, we have no choice but to continue 2217 * processing this OPEN; presumably, we'll 2218 * fail again for the same reason. 2219 */ 2220 dprintk("nfsd4_process_open1: replay with no replay cache\n"); 2221 goto renew; 2222 } 2223 if (open->op_seqid != sop->so_seqid) 2224 return nfserr_bad_seqid; 2225 renew: 2226 if (open->op_stateowner == NULL) { 2227 sop = alloc_init_open_stateowner(strhashval, clp, open); 2228 if (sop == NULL) 2229 return nfserr_resource; 2230 open->op_stateowner = sop; 2231 } 2232 list_del_init(&sop->so_close_lru); 2233 renew_client(sop->so_client); 2234 return nfs_ok; 2235 } 2236 2237 static inline __be32 2238 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 2239 { 2240 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 2241 return nfserr_openmode; 2242 else 2243 return nfs_ok; 2244 } 2245 2246 static struct nfs4_delegation * 2247 find_delegation_file(struct nfs4_file *fp, stateid_t *stid) 2248 { 2249 struct nfs4_delegation *dp; 2250 2251 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) { 2252 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) 2253 return dp; 2254 } 2255 return NULL; 2256 } 2257 2258 static __be32 2259 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, 2260 struct nfs4_delegation **dp) 2261 { 2262 int flags; 2263 __be32 status = nfserr_bad_stateid; 2264 2265 *dp = find_delegation_file(fp, &open->op_delegate_stateid); 2266 if (*dp == NULL) 2267 goto out; 2268 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ? 2269 RD_STATE : WR_STATE; 2270 status = nfs4_check_delegmode(*dp, flags); 2271 if (status) 2272 *dp = NULL; 2273 out: 2274 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR) 2275 return nfs_ok; 2276 if (status) 2277 return status; 2278 open->op_stateowner->so_confirmed = 1; 2279 return nfs_ok; 2280 } 2281 2282 static __be32 2283 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 2284 { 2285 struct nfs4_stateid *local; 2286 __be32 status = nfserr_share_denied; 2287 struct nfs4_stateowner *sop = open->op_stateowner; 2288 2289 list_for_each_entry(local, &fp->fi_stateids, st_perfile) { 2290 /* ignore lock owners */ 2291 if (local->st_stateowner->so_is_open_owner == 0) 2292 continue; 2293 /* remember if we have seen this open owner */ 2294 if (local->st_stateowner == sop) 2295 *stpp = local; 2296 /* check for conflicting share reservations */ 2297 if (!test_share(local, open)) 2298 goto out; 2299 } 2300 status = 0; 2301 out: 2302 return status; 2303 } 2304 2305 static inline struct nfs4_stateid * 2306 nfs4_alloc_stateid(void) 2307 { 2308 return kmem_cache_alloc(stateid_slab, GFP_KERNEL); 2309 } 2310 2311 static __be32 2312 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, 2313 struct nfs4_delegation *dp, 2314 struct svc_fh *cur_fh, int flags) 2315 { 2316 struct nfs4_stateid *stp; 2317 2318 stp = nfs4_alloc_stateid(); 2319 if (stp == NULL) 2320 return nfserr_resource; 2321 2322 if (dp) { 2323 get_file(dp->dl_vfs_file); 2324 stp->st_vfs_file = dp->dl_vfs_file; 2325 } else { 2326 __be32 status; 2327 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, 2328 &stp->st_vfs_file); 2329 if (status) { 2330 if (status == nfserr_dropit) 2331 status = nfserr_jukebox; 2332 kmem_cache_free(stateid_slab, stp); 2333 return status; 2334 } 2335 } 2336 *stpp = stp; 2337 return 0; 2338 } 2339 2340 static inline __be32 2341 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 2342 struct nfsd4_open *open) 2343 { 2344 struct iattr iattr = { 2345 .ia_valid = ATTR_SIZE, 2346 .ia_size = 0, 2347 }; 2348 if (!open->op_truncate) 2349 return 0; 2350 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 2351 return nfserr_inval; 2352 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 2353 } 2354 2355 static __be32 2356 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) 2357 { 2358 struct file *filp = stp->st_vfs_file; 2359 struct inode *inode = filp->f_path.dentry->d_inode; 2360 unsigned int share_access, new_writer; 2361 __be32 status; 2362 2363 set_access(&share_access, stp->st_access_bmap); 2364 new_writer = (~share_access) & open->op_share_access 2365 & NFS4_SHARE_ACCESS_WRITE; 2366 2367 if (new_writer) { 2368 int err = get_write_access(inode); 2369 if (err) 2370 return nfserrno(err); 2371 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt); 2372 if (err) 2373 return nfserrno(err); 2374 file_take_write(filp); 2375 } 2376 status = nfsd4_truncate(rqstp, cur_fh, open); 2377 if (status) { 2378 if (new_writer) 2379 put_write_access(inode); 2380 return status; 2381 } 2382 /* remember the open */ 2383 filp->f_mode |= open->op_share_access; 2384 __set_bit(open->op_share_access, &stp->st_access_bmap); 2385 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 2386 2387 return nfs_ok; 2388 } 2389 2390 2391 static void 2392 nfs4_set_claim_prev(struct nfsd4_open *open) 2393 { 2394 open->op_stateowner->so_confirmed = 1; 2395 open->op_stateowner->so_client->cl_firststate = 1; 2396 } 2397 2398 /* 2399 * Attempt to hand out a delegation. 2400 */ 2401 static void 2402 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp) 2403 { 2404 struct nfs4_delegation *dp; 2405 struct nfs4_stateowner *sop = stp->st_stateowner; 2406 int cb_up = atomic_read(&sop->so_client->cl_cb_set); 2407 struct file_lock fl, *flp = &fl; 2408 int status, flag = 0; 2409 2410 flag = NFS4_OPEN_DELEGATE_NONE; 2411 open->op_recall = 0; 2412 switch (open->op_claim_type) { 2413 case NFS4_OPEN_CLAIM_PREVIOUS: 2414 if (!cb_up) 2415 open->op_recall = 1; 2416 flag = open->op_delegate_type; 2417 if (flag == NFS4_OPEN_DELEGATE_NONE) 2418 goto out; 2419 break; 2420 case NFS4_OPEN_CLAIM_NULL: 2421 /* Let's not give out any delegations till everyone's 2422 * had the chance to reclaim theirs.... */ 2423 if (locks_in_grace()) 2424 goto out; 2425 if (!cb_up || !sop->so_confirmed) 2426 goto out; 2427 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 2428 flag = NFS4_OPEN_DELEGATE_WRITE; 2429 else 2430 flag = NFS4_OPEN_DELEGATE_READ; 2431 break; 2432 default: 2433 goto out; 2434 } 2435 2436 dp = alloc_init_deleg(sop->so_client, stp, fh, flag); 2437 if (dp == NULL) { 2438 flag = NFS4_OPEN_DELEGATE_NONE; 2439 goto out; 2440 } 2441 locks_init_lock(&fl); 2442 fl.fl_lmops = &nfsd_lease_mng_ops; 2443 fl.fl_flags = FL_LEASE; 2444 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; 2445 fl.fl_end = OFFSET_MAX; 2446 fl.fl_owner = (fl_owner_t)dp; 2447 fl.fl_file = stp->st_vfs_file; 2448 fl.fl_pid = current->tgid; 2449 2450 /* vfs_setlease checks to see if delegation should be handed out. 2451 * the lock_manager callbacks fl_mylease and fl_change are used 2452 */ 2453 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) { 2454 dprintk("NFSD: setlease failed [%d], no delegation\n", status); 2455 unhash_delegation(dp); 2456 flag = NFS4_OPEN_DELEGATE_NONE; 2457 goto out; 2458 } 2459 2460 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); 2461 2462 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n", 2463 STATEID_VAL(&dp->dl_stateid)); 2464 out: 2465 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS 2466 && flag == NFS4_OPEN_DELEGATE_NONE 2467 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) 2468 dprintk("NFSD: WARNING: refusing delegation reclaim\n"); 2469 open->op_delegate_type = flag; 2470 } 2471 2472 /* 2473 * called with nfs4_lock_state() held. 2474 */ 2475 __be32 2476 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 2477 { 2478 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2479 struct nfs4_file *fp = NULL; 2480 struct inode *ino = current_fh->fh_dentry->d_inode; 2481 struct nfs4_stateid *stp = NULL; 2482 struct nfs4_delegation *dp = NULL; 2483 __be32 status; 2484 2485 status = nfserr_inval; 2486 if (!access_valid(open->op_share_access, resp->cstate.minorversion) 2487 || !deny_valid(open->op_share_deny)) 2488 goto out; 2489 /* 2490 * Lookup file; if found, lookup stateid and check open request, 2491 * and check for delegations in the process of being recalled. 2492 * If not found, create the nfs4_file struct 2493 */ 2494 fp = find_file(ino); 2495 if (fp) { 2496 if ((status = nfs4_check_open(fp, open, &stp))) 2497 goto out; 2498 status = nfs4_check_deleg(fp, open, &dp); 2499 if (status) 2500 goto out; 2501 } else { 2502 status = nfserr_bad_stateid; 2503 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) 2504 goto out; 2505 status = nfserr_resource; 2506 fp = alloc_init_file(ino); 2507 if (fp == NULL) 2508 goto out; 2509 } 2510 2511 /* 2512 * OPEN the file, or upgrade an existing OPEN. 2513 * If truncate fails, the OPEN fails. 2514 */ 2515 if (stp) { 2516 /* Stateid was found, this is an OPEN upgrade */ 2517 status = nfs4_upgrade_open(rqstp, current_fh, stp, open); 2518 if (status) 2519 goto out; 2520 update_stateid(&stp->st_stateid); 2521 } else { 2522 /* Stateid was not found, this is a new OPEN */ 2523 int flags = 0; 2524 if (open->op_share_access & NFS4_SHARE_ACCESS_READ) 2525 flags |= NFSD_MAY_READ; 2526 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 2527 flags |= NFSD_MAY_WRITE; 2528 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags); 2529 if (status) 2530 goto out; 2531 init_stateid(stp, fp, open); 2532 status = nfsd4_truncate(rqstp, current_fh, open); 2533 if (status) { 2534 release_open_stateid(stp); 2535 goto out; 2536 } 2537 if (nfsd4_has_session(&resp->cstate)) 2538 update_stateid(&stp->st_stateid); 2539 } 2540 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 2541 2542 if (nfsd4_has_session(&resp->cstate)) 2543 open->op_stateowner->so_confirmed = 1; 2544 2545 /* 2546 * Attempt to hand out a delegation. No error return, because the 2547 * OPEN succeeds even if we fail. 2548 */ 2549 nfs4_open_delegation(current_fh, open, stp); 2550 2551 status = nfs_ok; 2552 2553 dprintk("%s: stateid=" STATEID_FMT "\n", __func__, 2554 STATEID_VAL(&stp->st_stateid)); 2555 out: 2556 if (fp) 2557 put_nfs4_file(fp); 2558 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 2559 nfs4_set_claim_prev(open); 2560 /* 2561 * To finish the open response, we just need to set the rflags. 2562 */ 2563 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 2564 if (!open->op_stateowner->so_confirmed && 2565 !nfsd4_has_session(&resp->cstate)) 2566 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 2567 2568 return status; 2569 } 2570 2571 __be32 2572 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2573 clientid_t *clid) 2574 { 2575 struct nfs4_client *clp; 2576 __be32 status; 2577 2578 nfs4_lock_state(); 2579 dprintk("process_renew(%08x/%08x): starting\n", 2580 clid->cl_boot, clid->cl_id); 2581 status = nfserr_stale_clientid; 2582 if (STALE_CLIENTID(clid)) 2583 goto out; 2584 clp = find_confirmed_client(clid); 2585 status = nfserr_expired; 2586 if (clp == NULL) { 2587 /* We assume the client took too long to RENEW. */ 2588 dprintk("nfsd4_renew: clientid not found!\n"); 2589 goto out; 2590 } 2591 renew_client(clp); 2592 status = nfserr_cb_path_down; 2593 if (!list_empty(&clp->cl_delegations) 2594 && !atomic_read(&clp->cl_cb_set)) 2595 goto out; 2596 status = nfs_ok; 2597 out: 2598 nfs4_unlock_state(); 2599 return status; 2600 } 2601 2602 struct lock_manager nfsd4_manager = { 2603 }; 2604 2605 static void 2606 nfsd4_end_grace(void) 2607 { 2608 dprintk("NFSD: end of grace period\n"); 2609 nfsd4_recdir_purge_old(); 2610 locks_end_grace(&nfsd4_manager); 2611 /* 2612 * Now that every NFSv4 client has had the chance to recover and 2613 * to see the (possibly new, possibly shorter) lease time, we 2614 * can safely set the next grace time to the current lease time: 2615 */ 2616 nfsd4_grace = nfsd4_lease; 2617 } 2618 2619 static time_t 2620 nfs4_laundromat(void) 2621 { 2622 struct nfs4_client *clp; 2623 struct nfs4_stateowner *sop; 2624 struct nfs4_delegation *dp; 2625 struct list_head *pos, *next, reaplist; 2626 time_t cutoff = get_seconds() - nfsd4_lease; 2627 time_t t, clientid_val = nfsd4_lease; 2628 time_t u, test_val = nfsd4_lease; 2629 2630 nfs4_lock_state(); 2631 2632 dprintk("NFSD: laundromat service - starting\n"); 2633 if (locks_in_grace()) 2634 nfsd4_end_grace(); 2635 INIT_LIST_HEAD(&reaplist); 2636 spin_lock(&client_lock); 2637 list_for_each_safe(pos, next, &client_lru) { 2638 clp = list_entry(pos, struct nfs4_client, cl_lru); 2639 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 2640 t = clp->cl_time - cutoff; 2641 if (clientid_val > t) 2642 clientid_val = t; 2643 break; 2644 } 2645 if (atomic_read(&clp->cl_refcount)) { 2646 dprintk("NFSD: client in use (clientid %08x)\n", 2647 clp->cl_clientid.cl_id); 2648 continue; 2649 } 2650 unhash_client_locked(clp); 2651 list_add(&clp->cl_lru, &reaplist); 2652 } 2653 spin_unlock(&client_lock); 2654 list_for_each_safe(pos, next, &reaplist) { 2655 clp = list_entry(pos, struct nfs4_client, cl_lru); 2656 dprintk("NFSD: purging unused client (clientid %08x)\n", 2657 clp->cl_clientid.cl_id); 2658 nfsd4_remove_clid_dir(clp); 2659 expire_client(clp); 2660 } 2661 spin_lock(&recall_lock); 2662 list_for_each_safe(pos, next, &del_recall_lru) { 2663 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 2664 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 2665 u = dp->dl_time - cutoff; 2666 if (test_val > u) 2667 test_val = u; 2668 break; 2669 } 2670 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 2671 dp, dp->dl_flock); 2672 list_move(&dp->dl_recall_lru, &reaplist); 2673 } 2674 spin_unlock(&recall_lock); 2675 list_for_each_safe(pos, next, &reaplist) { 2676 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 2677 list_del_init(&dp->dl_recall_lru); 2678 unhash_delegation(dp); 2679 } 2680 test_val = nfsd4_lease; 2681 list_for_each_safe(pos, next, &close_lru) { 2682 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 2683 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 2684 u = sop->so_time - cutoff; 2685 if (test_val > u) 2686 test_val = u; 2687 break; 2688 } 2689 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 2690 sop->so_id); 2691 release_openowner(sop); 2692 } 2693 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 2694 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 2695 nfs4_unlock_state(); 2696 return clientid_val; 2697 } 2698 2699 static struct workqueue_struct *laundry_wq; 2700 static void laundromat_main(struct work_struct *); 2701 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); 2702 2703 static void 2704 laundromat_main(struct work_struct *not_used) 2705 { 2706 time_t t; 2707 2708 t = nfs4_laundromat(); 2709 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 2710 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); 2711 } 2712 2713 static struct nfs4_stateowner * 2714 search_close_lru(u32 st_id, int flags) 2715 { 2716 struct nfs4_stateowner *local = NULL; 2717 2718 if (flags & CLOSE_STATE) { 2719 list_for_each_entry(local, &close_lru, so_close_lru) { 2720 if (local->so_id == st_id) 2721 return local; 2722 } 2723 } 2724 return NULL; 2725 } 2726 2727 static inline int 2728 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 2729 { 2730 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode; 2731 } 2732 2733 static int 2734 STALE_STATEID(stateid_t *stateid) 2735 { 2736 if (stateid->si_boot == boot_time) 2737 return 0; 2738 dprintk("NFSD: stale stateid " STATEID_FMT "!\n", 2739 STATEID_VAL(stateid)); 2740 return 1; 2741 } 2742 2743 static inline int 2744 access_permit_read(unsigned long access_bmap) 2745 { 2746 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 2747 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 2748 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 2749 } 2750 2751 static inline int 2752 access_permit_write(unsigned long access_bmap) 2753 { 2754 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 2755 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 2756 } 2757 2758 static 2759 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 2760 { 2761 __be32 status = nfserr_openmode; 2762 2763 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 2764 goto out; 2765 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 2766 goto out; 2767 status = nfs_ok; 2768 out: 2769 return status; 2770 } 2771 2772 static inline __be32 2773 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 2774 { 2775 if (ONE_STATEID(stateid) && (flags & RD_STATE)) 2776 return nfs_ok; 2777 else if (locks_in_grace()) { 2778 /* Answer in remaining cases depends on existance of 2779 * conflicting state; so we must wait out the grace period. */ 2780 return nfserr_grace; 2781 } else if (flags & WR_STATE) 2782 return nfs4_share_conflict(current_fh, 2783 NFS4_SHARE_DENY_WRITE); 2784 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 2785 return nfs4_share_conflict(current_fh, 2786 NFS4_SHARE_DENY_READ); 2787 } 2788 2789 /* 2790 * Allow READ/WRITE during grace period on recovered state only for files 2791 * that are not able to provide mandatory locking. 2792 */ 2793 static inline int 2794 grace_disallows_io(struct inode *inode) 2795 { 2796 return locks_in_grace() && mandatory_lock(inode); 2797 } 2798 2799 static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags) 2800 { 2801 /* 2802 * When sessions are used the stateid generation number is ignored 2803 * when it is zero. 2804 */ 2805 if ((flags & HAS_SESSION) && in->si_generation == 0) 2806 goto out; 2807 2808 /* If the client sends us a stateid from the future, it's buggy: */ 2809 if (in->si_generation > ref->si_generation) 2810 return nfserr_bad_stateid; 2811 /* 2812 * The following, however, can happen. For example, if the 2813 * client sends an open and some IO at the same time, the open 2814 * may bump si_generation while the IO is still in flight. 2815 * Thanks to hard links and renames, the client never knows what 2816 * file an open will affect. So it could avoid that situation 2817 * only by serializing all opens and IO from the same open 2818 * owner. To recover from the old_stateid error, the client 2819 * will just have to retry the IO: 2820 */ 2821 if (in->si_generation < ref->si_generation) 2822 return nfserr_old_stateid; 2823 out: 2824 return nfs_ok; 2825 } 2826 2827 static int is_delegation_stateid(stateid_t *stateid) 2828 { 2829 return stateid->si_fileid == 0; 2830 } 2831 2832 /* 2833 * Checks for stateid operations 2834 */ 2835 __be32 2836 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate, 2837 stateid_t *stateid, int flags, struct file **filpp) 2838 { 2839 struct nfs4_stateid *stp = NULL; 2840 struct nfs4_delegation *dp = NULL; 2841 struct svc_fh *current_fh = &cstate->current_fh; 2842 struct inode *ino = current_fh->fh_dentry->d_inode; 2843 __be32 status; 2844 2845 if (filpp) 2846 *filpp = NULL; 2847 2848 if (grace_disallows_io(ino)) 2849 return nfserr_grace; 2850 2851 if (nfsd4_has_session(cstate)) 2852 flags |= HAS_SESSION; 2853 2854 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 2855 return check_special_stateids(current_fh, stateid, flags); 2856 2857 status = nfserr_stale_stateid; 2858 if (STALE_STATEID(stateid)) 2859 goto out; 2860 2861 status = nfserr_bad_stateid; 2862 if (is_delegation_stateid(stateid)) { 2863 dp = find_delegation_stateid(ino, stateid); 2864 if (!dp) 2865 goto out; 2866 status = check_stateid_generation(stateid, &dp->dl_stateid, 2867 flags); 2868 if (status) 2869 goto out; 2870 status = nfs4_check_delegmode(dp, flags); 2871 if (status) 2872 goto out; 2873 renew_client(dp->dl_client); 2874 if (filpp) 2875 *filpp = dp->dl_vfs_file; 2876 } else { /* open or lock stateid */ 2877 stp = find_stateid(stateid, flags); 2878 if (!stp) 2879 goto out; 2880 if (nfs4_check_fh(current_fh, stp)) 2881 goto out; 2882 if (!stp->st_stateowner->so_confirmed) 2883 goto out; 2884 status = check_stateid_generation(stateid, &stp->st_stateid, 2885 flags); 2886 if (status) 2887 goto out; 2888 status = nfs4_check_openmode(stp, flags); 2889 if (status) 2890 goto out; 2891 renew_client(stp->st_stateowner->so_client); 2892 if (filpp) 2893 *filpp = stp->st_vfs_file; 2894 } 2895 status = nfs_ok; 2896 out: 2897 return status; 2898 } 2899 2900 static inline int 2901 setlkflg (int type) 2902 { 2903 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 2904 RD_STATE : WR_STATE; 2905 } 2906 2907 /* 2908 * Checks for sequence id mutating operations. 2909 */ 2910 static __be32 2911 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, 2912 stateid_t *stateid, int flags, 2913 struct nfs4_stateowner **sopp, 2914 struct nfs4_stateid **stpp, struct nfsd4_lock *lock) 2915 { 2916 struct nfs4_stateid *stp; 2917 struct nfs4_stateowner *sop; 2918 struct svc_fh *current_fh = &cstate->current_fh; 2919 __be32 status; 2920 2921 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, 2922 seqid, STATEID_VAL(stateid)); 2923 2924 *stpp = NULL; 2925 *sopp = NULL; 2926 2927 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 2928 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n"); 2929 return nfserr_bad_stateid; 2930 } 2931 2932 if (STALE_STATEID(stateid)) 2933 return nfserr_stale_stateid; 2934 2935 if (nfsd4_has_session(cstate)) 2936 flags |= HAS_SESSION; 2937 2938 /* 2939 * We return BAD_STATEID if filehandle doesn't match stateid, 2940 * the confirmed flag is incorrecly set, or the generation 2941 * number is incorrect. 2942 */ 2943 stp = find_stateid(stateid, flags); 2944 if (stp == NULL) { 2945 /* 2946 * Also, we should make sure this isn't just the result of 2947 * a replayed close: 2948 */ 2949 sop = search_close_lru(stateid->si_stateownerid, flags); 2950 if (sop == NULL) 2951 return nfserr_bad_stateid; 2952 *sopp = sop; 2953 goto check_replay; 2954 } 2955 2956 *stpp = stp; 2957 *sopp = sop = stp->st_stateowner; 2958 2959 if (lock) { 2960 clientid_t *lockclid = &lock->v.new.clientid; 2961 struct nfs4_client *clp = sop->so_client; 2962 int lkflg = 0; 2963 __be32 status; 2964 2965 lkflg = setlkflg(lock->lk_type); 2966 2967 if (lock->lk_is_new) { 2968 if (!sop->so_is_open_owner) 2969 return nfserr_bad_stateid; 2970 if (!(flags & HAS_SESSION) && 2971 !same_clid(&clp->cl_clientid, lockclid)) 2972 return nfserr_bad_stateid; 2973 /* stp is the open stateid */ 2974 status = nfs4_check_openmode(stp, lkflg); 2975 if (status) 2976 return status; 2977 } else { 2978 /* stp is the lock stateid */ 2979 status = nfs4_check_openmode(stp->st_openstp, lkflg); 2980 if (status) 2981 return status; 2982 } 2983 } 2984 2985 if (nfs4_check_fh(current_fh, stp)) { 2986 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 2987 return nfserr_bad_stateid; 2988 } 2989 2990 /* 2991 * We now validate the seqid and stateid generation numbers. 2992 * For the moment, we ignore the possibility of 2993 * generation number wraparound. 2994 */ 2995 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid) 2996 goto check_replay; 2997 2998 if (sop->so_confirmed && flags & CONFIRM) { 2999 dprintk("NFSD: preprocess_seqid_op: expected" 3000 " unconfirmed stateowner!\n"); 3001 return nfserr_bad_stateid; 3002 } 3003 if (!sop->so_confirmed && !(flags & CONFIRM)) { 3004 dprintk("NFSD: preprocess_seqid_op: stateowner not" 3005 " confirmed yet!\n"); 3006 return nfserr_bad_stateid; 3007 } 3008 status = check_stateid_generation(stateid, &stp->st_stateid, flags); 3009 if (status) 3010 return status; 3011 renew_client(sop->so_client); 3012 return nfs_ok; 3013 3014 check_replay: 3015 if (seqid == sop->so_seqid - 1) { 3016 dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); 3017 /* indicate replay to calling function */ 3018 return nfserr_replay_me; 3019 } 3020 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", 3021 sop->so_seqid, seqid); 3022 *sopp = NULL; 3023 return nfserr_bad_seqid; 3024 } 3025 3026 __be32 3027 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3028 struct nfsd4_open_confirm *oc) 3029 { 3030 __be32 status; 3031 struct nfs4_stateowner *sop; 3032 struct nfs4_stateid *stp; 3033 3034 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 3035 (int)cstate->current_fh.fh_dentry->d_name.len, 3036 cstate->current_fh.fh_dentry->d_name.name); 3037 3038 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); 3039 if (status) 3040 return status; 3041 3042 nfs4_lock_state(); 3043 3044 if ((status = nfs4_preprocess_seqid_op(cstate, 3045 oc->oc_seqid, &oc->oc_req_stateid, 3046 CONFIRM | OPEN_STATE, 3047 &oc->oc_stateowner, &stp, NULL))) 3048 goto out; 3049 3050 sop = oc->oc_stateowner; 3051 sop->so_confirmed = 1; 3052 update_stateid(&stp->st_stateid); 3053 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 3054 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", 3055 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid)); 3056 3057 nfsd4_create_clid_dir(sop->so_client); 3058 out: 3059 if (oc->oc_stateowner) { 3060 nfs4_get_stateowner(oc->oc_stateowner); 3061 cstate->replay_owner = oc->oc_stateowner; 3062 } 3063 nfs4_unlock_state(); 3064 return status; 3065 } 3066 3067 3068 /* 3069 * unset all bits in union bitmap (bmap) that 3070 * do not exist in share (from successful OPEN_DOWNGRADE) 3071 */ 3072 static void 3073 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 3074 { 3075 int i; 3076 for (i = 1; i < 4; i++) { 3077 if ((i & access) != i) 3078 __clear_bit(i, bmap); 3079 } 3080 } 3081 3082 static void 3083 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 3084 { 3085 int i; 3086 for (i = 0; i < 4; i++) { 3087 if ((i & deny) != i) 3088 __clear_bit(i, bmap); 3089 } 3090 } 3091 3092 __be32 3093 nfsd4_open_downgrade(struct svc_rqst *rqstp, 3094 struct nfsd4_compound_state *cstate, 3095 struct nfsd4_open_downgrade *od) 3096 { 3097 __be32 status; 3098 struct nfs4_stateid *stp; 3099 unsigned int share_access; 3100 3101 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 3102 (int)cstate->current_fh.fh_dentry->d_name.len, 3103 cstate->current_fh.fh_dentry->d_name.name); 3104 3105 if (!access_valid(od->od_share_access, cstate->minorversion) 3106 || !deny_valid(od->od_share_deny)) 3107 return nfserr_inval; 3108 3109 nfs4_lock_state(); 3110 if ((status = nfs4_preprocess_seqid_op(cstate, 3111 od->od_seqid, 3112 &od->od_stateid, 3113 OPEN_STATE, 3114 &od->od_stateowner, &stp, NULL))) 3115 goto out; 3116 3117 status = nfserr_inval; 3118 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 3119 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 3120 stp->st_access_bmap, od->od_share_access); 3121 goto out; 3122 } 3123 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 3124 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 3125 stp->st_deny_bmap, od->od_share_deny); 3126 goto out; 3127 } 3128 set_access(&share_access, stp->st_access_bmap); 3129 nfs4_file_downgrade(stp->st_vfs_file, 3130 share_access & ~od->od_share_access); 3131 3132 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 3133 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 3134 3135 update_stateid(&stp->st_stateid); 3136 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 3137 status = nfs_ok; 3138 out: 3139 if (od->od_stateowner) { 3140 nfs4_get_stateowner(od->od_stateowner); 3141 cstate->replay_owner = od->od_stateowner; 3142 } 3143 nfs4_unlock_state(); 3144 return status; 3145 } 3146 3147 /* 3148 * nfs4_unlock_state() called after encode 3149 */ 3150 __be32 3151 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3152 struct nfsd4_close *close) 3153 { 3154 __be32 status; 3155 struct nfs4_stateid *stp; 3156 3157 dprintk("NFSD: nfsd4_close on file %.*s\n", 3158 (int)cstate->current_fh.fh_dentry->d_name.len, 3159 cstate->current_fh.fh_dentry->d_name.name); 3160 3161 nfs4_lock_state(); 3162 /* check close_lru for replay */ 3163 if ((status = nfs4_preprocess_seqid_op(cstate, 3164 close->cl_seqid, 3165 &close->cl_stateid, 3166 OPEN_STATE | CLOSE_STATE, 3167 &close->cl_stateowner, &stp, NULL))) 3168 goto out; 3169 status = nfs_ok; 3170 update_stateid(&stp->st_stateid); 3171 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 3172 3173 /* release_stateid() calls nfsd_close() if needed */ 3174 release_open_stateid(stp); 3175 3176 /* place unused nfs4_stateowners on so_close_lru list to be 3177 * released by the laundromat service after the lease period 3178 * to enable us to handle CLOSE replay 3179 */ 3180 if (list_empty(&close->cl_stateowner->so_stateids)) 3181 move_to_close_lru(close->cl_stateowner); 3182 out: 3183 if (close->cl_stateowner) { 3184 nfs4_get_stateowner(close->cl_stateowner); 3185 cstate->replay_owner = close->cl_stateowner; 3186 } 3187 nfs4_unlock_state(); 3188 return status; 3189 } 3190 3191 __be32 3192 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3193 struct nfsd4_delegreturn *dr) 3194 { 3195 struct nfs4_delegation *dp; 3196 stateid_t *stateid = &dr->dr_stateid; 3197 struct inode *inode; 3198 __be32 status; 3199 int flags = 0; 3200 3201 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 3202 return status; 3203 inode = cstate->current_fh.fh_dentry->d_inode; 3204 3205 if (nfsd4_has_session(cstate)) 3206 flags |= HAS_SESSION; 3207 nfs4_lock_state(); 3208 status = nfserr_bad_stateid; 3209 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 3210 goto out; 3211 status = nfserr_stale_stateid; 3212 if (STALE_STATEID(stateid)) 3213 goto out; 3214 status = nfserr_bad_stateid; 3215 if (!is_delegation_stateid(stateid)) 3216 goto out; 3217 dp = find_delegation_stateid(inode, stateid); 3218 if (!dp) 3219 goto out; 3220 status = check_stateid_generation(stateid, &dp->dl_stateid, flags); 3221 if (status) 3222 goto out; 3223 renew_client(dp->dl_client); 3224 3225 unhash_delegation(dp); 3226 out: 3227 nfs4_unlock_state(); 3228 3229 return status; 3230 } 3231 3232 3233 /* 3234 * Lock owner state (byte-range locks) 3235 */ 3236 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 3237 #define LOCK_HASH_BITS 8 3238 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 3239 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 3240 3241 static inline u64 3242 end_offset(u64 start, u64 len) 3243 { 3244 u64 end; 3245 3246 end = start + len; 3247 return end >= start ? end: NFS4_MAX_UINT64; 3248 } 3249 3250 /* last octet in a range */ 3251 static inline u64 3252 last_byte_offset(u64 start, u64 len) 3253 { 3254 u64 end; 3255 3256 BUG_ON(!len); 3257 end = start + len; 3258 return end > start ? end - 1: NFS4_MAX_UINT64; 3259 } 3260 3261 #define lockownerid_hashval(id) \ 3262 ((id) & LOCK_HASH_MASK) 3263 3264 static inline unsigned int 3265 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 3266 struct xdr_netobj *ownername) 3267 { 3268 return (file_hashval(inode) + cl_id 3269 + opaque_hashval(ownername->data, ownername->len)) 3270 & LOCK_HASH_MASK; 3271 } 3272 3273 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 3274 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 3275 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 3276 3277 static struct nfs4_stateid * 3278 find_stateid(stateid_t *stid, int flags) 3279 { 3280 struct nfs4_stateid *local; 3281 u32 st_id = stid->si_stateownerid; 3282 u32 f_id = stid->si_fileid; 3283 unsigned int hashval; 3284 3285 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 3286 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) { 3287 hashval = stateid_hashval(st_id, f_id); 3288 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 3289 if ((local->st_stateid.si_stateownerid == st_id) && 3290 (local->st_stateid.si_fileid == f_id)) 3291 return local; 3292 } 3293 } 3294 3295 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) { 3296 hashval = stateid_hashval(st_id, f_id); 3297 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 3298 if ((local->st_stateid.si_stateownerid == st_id) && 3299 (local->st_stateid.si_fileid == f_id)) 3300 return local; 3301 } 3302 } 3303 return NULL; 3304 } 3305 3306 static struct nfs4_delegation * 3307 find_delegation_stateid(struct inode *ino, stateid_t *stid) 3308 { 3309 struct nfs4_file *fp; 3310 struct nfs4_delegation *dl; 3311 3312 dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__, 3313 STATEID_VAL(stid)); 3314 3315 fp = find_file(ino); 3316 if (!fp) 3317 return NULL; 3318 dl = find_delegation_file(fp, stid); 3319 put_nfs4_file(fp); 3320 return dl; 3321 } 3322 3323 /* 3324 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 3325 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 3326 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 3327 * locking, this prevents us from being completely protocol-compliant. The 3328 * real solution to this problem is to start using unsigned file offsets in 3329 * the VFS, but this is a very deep change! 3330 */ 3331 static inline void 3332 nfs4_transform_lock_offset(struct file_lock *lock) 3333 { 3334 if (lock->fl_start < 0) 3335 lock->fl_start = OFFSET_MAX; 3336 if (lock->fl_end < 0) 3337 lock->fl_end = OFFSET_MAX; 3338 } 3339 3340 /* Hack!: For now, we're defining this just so we can use a pointer to it 3341 * as a unique cookie to identify our (NFSv4's) posix locks. */ 3342 static const struct lock_manager_operations nfsd_posix_mng_ops = { 3343 }; 3344 3345 static inline void 3346 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 3347 { 3348 struct nfs4_stateowner *sop; 3349 unsigned int hval; 3350 3351 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 3352 sop = (struct nfs4_stateowner *) fl->fl_owner; 3353 hval = lockownerid_hashval(sop->so_id); 3354 kref_get(&sop->so_ref); 3355 deny->ld_sop = sop; 3356 deny->ld_clientid = sop->so_client->cl_clientid; 3357 } else { 3358 deny->ld_sop = NULL; 3359 deny->ld_clientid.cl_boot = 0; 3360 deny->ld_clientid.cl_id = 0; 3361 } 3362 deny->ld_start = fl->fl_start; 3363 deny->ld_length = NFS4_MAX_UINT64; 3364 if (fl->fl_end != NFS4_MAX_UINT64) 3365 deny->ld_length = fl->fl_end - fl->fl_start + 1; 3366 deny->ld_type = NFS4_READ_LT; 3367 if (fl->fl_type != F_RDLCK) 3368 deny->ld_type = NFS4_WRITE_LT; 3369 } 3370 3371 static struct nfs4_stateowner * 3372 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 3373 struct xdr_netobj *owner) 3374 { 3375 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 3376 struct nfs4_stateowner *op; 3377 3378 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 3379 if (same_owner_str(op, owner, clid)) 3380 return op; 3381 } 3382 return NULL; 3383 } 3384 3385 /* 3386 * Alloc a lock owner structure. 3387 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 3388 * occured. 3389 * 3390 * strhashval = lock_ownerstr_hashval 3391 */ 3392 3393 static struct nfs4_stateowner * 3394 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 3395 struct nfs4_stateowner *sop; 3396 struct nfs4_replay *rp; 3397 unsigned int idhashval; 3398 3399 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 3400 return NULL; 3401 idhashval = lockownerid_hashval(current_ownerid); 3402 INIT_LIST_HEAD(&sop->so_idhash); 3403 INIT_LIST_HEAD(&sop->so_strhash); 3404 INIT_LIST_HEAD(&sop->so_perclient); 3405 INIT_LIST_HEAD(&sop->so_stateids); 3406 INIT_LIST_HEAD(&sop->so_perstateid); 3407 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 3408 sop->so_time = 0; 3409 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 3410 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 3411 list_add(&sop->so_perstateid, &open_stp->st_lockowners); 3412 sop->so_is_open_owner = 0; 3413 sop->so_id = current_ownerid++; 3414 sop->so_client = clp; 3415 /* It is the openowner seqid that will be incremented in encode in the 3416 * case of new lockowners; so increment the lock seqid manually: */ 3417 sop->so_seqid = lock->lk_new_lock_seqid + 1; 3418 sop->so_confirmed = 1; 3419 rp = &sop->so_replay; 3420 rp->rp_status = nfserr_serverfault; 3421 rp->rp_buflen = 0; 3422 rp->rp_buf = rp->rp_ibuf; 3423 return sop; 3424 } 3425 3426 static struct nfs4_stateid * 3427 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 3428 { 3429 struct nfs4_stateid *stp; 3430 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 3431 3432 stp = nfs4_alloc_stateid(); 3433 if (stp == NULL) 3434 goto out; 3435 INIT_LIST_HEAD(&stp->st_hash); 3436 INIT_LIST_HEAD(&stp->st_perfile); 3437 INIT_LIST_HEAD(&stp->st_perstateowner); 3438 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ 3439 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 3440 list_add(&stp->st_perfile, &fp->fi_stateids); 3441 list_add(&stp->st_perstateowner, &sop->so_stateids); 3442 stp->st_stateowner = sop; 3443 get_nfs4_file(fp); 3444 stp->st_file = fp; 3445 stp->st_stateid.si_boot = boot_time; 3446 stp->st_stateid.si_stateownerid = sop->so_id; 3447 stp->st_stateid.si_fileid = fp->fi_id; 3448 stp->st_stateid.si_generation = 0; 3449 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */ 3450 stp->st_access_bmap = open_stp->st_access_bmap; 3451 stp->st_deny_bmap = open_stp->st_deny_bmap; 3452 stp->st_openstp = open_stp; 3453 3454 out: 3455 return stp; 3456 } 3457 3458 static int 3459 check_lock_length(u64 offset, u64 length) 3460 { 3461 return ((length == 0) || ((length != NFS4_MAX_UINT64) && 3462 LOFF_OVERFLOW(offset, length))); 3463 } 3464 3465 /* 3466 * LOCK operation 3467 */ 3468 __be32 3469 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3470 struct nfsd4_lock *lock) 3471 { 3472 struct nfs4_stateowner *open_sop = NULL; 3473 struct nfs4_stateowner *lock_sop = NULL; 3474 struct nfs4_stateid *lock_stp; 3475 struct file *filp; 3476 struct file_lock file_lock; 3477 struct file_lock conflock; 3478 __be32 status = 0; 3479 unsigned int strhashval; 3480 unsigned int cmd; 3481 int err; 3482 3483 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 3484 (long long) lock->lk_offset, 3485 (long long) lock->lk_length); 3486 3487 if (check_lock_length(lock->lk_offset, lock->lk_length)) 3488 return nfserr_inval; 3489 3490 if ((status = fh_verify(rqstp, &cstate->current_fh, 3491 S_IFREG, NFSD_MAY_LOCK))) { 3492 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 3493 return status; 3494 } 3495 3496 nfs4_lock_state(); 3497 3498 if (lock->lk_is_new) { 3499 /* 3500 * Client indicates that this is a new lockowner. 3501 * Use open owner and open stateid to create lock owner and 3502 * lock stateid. 3503 */ 3504 struct nfs4_stateid *open_stp = NULL; 3505 struct nfs4_file *fp; 3506 3507 status = nfserr_stale_clientid; 3508 if (!nfsd4_has_session(cstate) && 3509 STALE_CLIENTID(&lock->lk_new_clientid)) 3510 goto out; 3511 3512 /* validate and update open stateid and open seqid */ 3513 status = nfs4_preprocess_seqid_op(cstate, 3514 lock->lk_new_open_seqid, 3515 &lock->lk_new_open_stateid, 3516 OPEN_STATE, 3517 &lock->lk_replay_owner, &open_stp, 3518 lock); 3519 if (status) 3520 goto out; 3521 open_sop = lock->lk_replay_owner; 3522 /* create lockowner and lock stateid */ 3523 fp = open_stp->st_file; 3524 strhashval = lock_ownerstr_hashval(fp->fi_inode, 3525 open_sop->so_client->cl_clientid.cl_id, 3526 &lock->v.new.owner); 3527 /* XXX: Do we need to check for duplicate stateowners on 3528 * the same file, or should they just be allowed (and 3529 * create new stateids)? */ 3530 status = nfserr_resource; 3531 lock_sop = alloc_init_lock_stateowner(strhashval, 3532 open_sop->so_client, open_stp, lock); 3533 if (lock_sop == NULL) 3534 goto out; 3535 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); 3536 if (lock_stp == NULL) 3537 goto out; 3538 } else { 3539 /* lock (lock owner + lock stateid) already exists */ 3540 status = nfs4_preprocess_seqid_op(cstate, 3541 lock->lk_old_lock_seqid, 3542 &lock->lk_old_lock_stateid, 3543 LOCK_STATE, 3544 &lock->lk_replay_owner, &lock_stp, lock); 3545 if (status) 3546 goto out; 3547 lock_sop = lock->lk_replay_owner; 3548 } 3549 /* lock->lk_replay_owner and lock_stp have been created or found */ 3550 filp = lock_stp->st_vfs_file; 3551 3552 status = nfserr_grace; 3553 if (locks_in_grace() && !lock->lk_reclaim) 3554 goto out; 3555 status = nfserr_no_grace; 3556 if (!locks_in_grace() && lock->lk_reclaim) 3557 goto out; 3558 3559 locks_init_lock(&file_lock); 3560 switch (lock->lk_type) { 3561 case NFS4_READ_LT: 3562 case NFS4_READW_LT: 3563 file_lock.fl_type = F_RDLCK; 3564 cmd = F_SETLK; 3565 break; 3566 case NFS4_WRITE_LT: 3567 case NFS4_WRITEW_LT: 3568 file_lock.fl_type = F_WRLCK; 3569 cmd = F_SETLK; 3570 break; 3571 default: 3572 status = nfserr_inval; 3573 goto out; 3574 } 3575 file_lock.fl_owner = (fl_owner_t)lock_sop; 3576 file_lock.fl_pid = current->tgid; 3577 file_lock.fl_file = filp; 3578 file_lock.fl_flags = FL_POSIX; 3579 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3580 3581 file_lock.fl_start = lock->lk_offset; 3582 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); 3583 nfs4_transform_lock_offset(&file_lock); 3584 3585 /* 3586 * Try to lock the file in the VFS. 3587 * Note: locks.c uses the BKL to protect the inode's lock list. 3588 */ 3589 3590 err = vfs_lock_file(filp, cmd, &file_lock, &conflock); 3591 switch (-err) { 3592 case 0: /* success! */ 3593 update_stateid(&lock_stp->st_stateid); 3594 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 3595 sizeof(stateid_t)); 3596 status = 0; 3597 break; 3598 case (EAGAIN): /* conflock holds conflicting lock */ 3599 status = nfserr_denied; 3600 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 3601 nfs4_set_lock_denied(&conflock, &lock->lk_denied); 3602 break; 3603 case (EDEADLK): 3604 status = nfserr_deadlock; 3605 break; 3606 default: 3607 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); 3608 status = nfserr_resource; 3609 break; 3610 } 3611 out: 3612 if (status && lock->lk_is_new && lock_sop) 3613 release_lockowner(lock_sop); 3614 if (lock->lk_replay_owner) { 3615 nfs4_get_stateowner(lock->lk_replay_owner); 3616 cstate->replay_owner = lock->lk_replay_owner; 3617 } 3618 nfs4_unlock_state(); 3619 return status; 3620 } 3621 3622 /* 3623 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, 3624 * so we do a temporary open here just to get an open file to pass to 3625 * vfs_test_lock. (Arguably perhaps test_lock should be done with an 3626 * inode operation.) 3627 */ 3628 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) 3629 { 3630 struct file *file; 3631 int err; 3632 3633 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 3634 if (err) 3635 return err; 3636 err = vfs_test_lock(file, lock); 3637 nfsd_close(file); 3638 return err; 3639 } 3640 3641 /* 3642 * LOCKT operation 3643 */ 3644 __be32 3645 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3646 struct nfsd4_lockt *lockt) 3647 { 3648 struct inode *inode; 3649 struct file_lock file_lock; 3650 int error; 3651 __be32 status; 3652 3653 if (locks_in_grace()) 3654 return nfserr_grace; 3655 3656 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 3657 return nfserr_inval; 3658 3659 lockt->lt_stateowner = NULL; 3660 nfs4_lock_state(); 3661 3662 status = nfserr_stale_clientid; 3663 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid)) 3664 goto out; 3665 3666 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) { 3667 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 3668 if (status == nfserr_symlink) 3669 status = nfserr_inval; 3670 goto out; 3671 } 3672 3673 inode = cstate->current_fh.fh_dentry->d_inode; 3674 locks_init_lock(&file_lock); 3675 switch (lockt->lt_type) { 3676 case NFS4_READ_LT: 3677 case NFS4_READW_LT: 3678 file_lock.fl_type = F_RDLCK; 3679 break; 3680 case NFS4_WRITE_LT: 3681 case NFS4_WRITEW_LT: 3682 file_lock.fl_type = F_WRLCK; 3683 break; 3684 default: 3685 dprintk("NFSD: nfs4_lockt: bad lock type!\n"); 3686 status = nfserr_inval; 3687 goto out; 3688 } 3689 3690 lockt->lt_stateowner = find_lockstateowner_str(inode, 3691 &lockt->lt_clientid, &lockt->lt_owner); 3692 if (lockt->lt_stateowner) 3693 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 3694 file_lock.fl_pid = current->tgid; 3695 file_lock.fl_flags = FL_POSIX; 3696 3697 file_lock.fl_start = lockt->lt_offset; 3698 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); 3699 3700 nfs4_transform_lock_offset(&file_lock); 3701 3702 status = nfs_ok; 3703 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock); 3704 if (error) { 3705 status = nfserrno(error); 3706 goto out; 3707 } 3708 if (file_lock.fl_type != F_UNLCK) { 3709 status = nfserr_denied; 3710 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); 3711 } 3712 out: 3713 nfs4_unlock_state(); 3714 return status; 3715 } 3716 3717 __be32 3718 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3719 struct nfsd4_locku *locku) 3720 { 3721 struct nfs4_stateid *stp; 3722 struct file *filp = NULL; 3723 struct file_lock file_lock; 3724 __be32 status; 3725 int err; 3726 3727 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 3728 (long long) locku->lu_offset, 3729 (long long) locku->lu_length); 3730 3731 if (check_lock_length(locku->lu_offset, locku->lu_length)) 3732 return nfserr_inval; 3733 3734 nfs4_lock_state(); 3735 3736 if ((status = nfs4_preprocess_seqid_op(cstate, 3737 locku->lu_seqid, 3738 &locku->lu_stateid, 3739 LOCK_STATE, 3740 &locku->lu_stateowner, &stp, NULL))) 3741 goto out; 3742 3743 filp = stp->st_vfs_file; 3744 BUG_ON(!filp); 3745 locks_init_lock(&file_lock); 3746 file_lock.fl_type = F_UNLCK; 3747 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 3748 file_lock.fl_pid = current->tgid; 3749 file_lock.fl_file = filp; 3750 file_lock.fl_flags = FL_POSIX; 3751 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3752 file_lock.fl_start = locku->lu_offset; 3753 3754 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length); 3755 nfs4_transform_lock_offset(&file_lock); 3756 3757 /* 3758 * Try to unlock the file in the VFS. 3759 */ 3760 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); 3761 if (err) { 3762 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); 3763 goto out_nfserr; 3764 } 3765 /* 3766 * OK, unlock succeeded; the only thing left to do is update the stateid. 3767 */ 3768 update_stateid(&stp->st_stateid); 3769 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 3770 3771 out: 3772 if (locku->lu_stateowner) { 3773 nfs4_get_stateowner(locku->lu_stateowner); 3774 cstate->replay_owner = locku->lu_stateowner; 3775 } 3776 nfs4_unlock_state(); 3777 return status; 3778 3779 out_nfserr: 3780 status = nfserrno(err); 3781 goto out; 3782 } 3783 3784 /* 3785 * returns 3786 * 1: locks held by lockowner 3787 * 0: no locks held by lockowner 3788 */ 3789 static int 3790 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner) 3791 { 3792 struct file_lock **flpp; 3793 struct inode *inode = filp->f_path.dentry->d_inode; 3794 int status = 0; 3795 3796 lock_kernel(); 3797 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 3798 if ((*flpp)->fl_owner == (fl_owner_t)lowner) { 3799 status = 1; 3800 goto out; 3801 } 3802 } 3803 out: 3804 unlock_kernel(); 3805 return status; 3806 } 3807 3808 __be32 3809 nfsd4_release_lockowner(struct svc_rqst *rqstp, 3810 struct nfsd4_compound_state *cstate, 3811 struct nfsd4_release_lockowner *rlockowner) 3812 { 3813 clientid_t *clid = &rlockowner->rl_clientid; 3814 struct nfs4_stateowner *sop; 3815 struct nfs4_stateid *stp; 3816 struct xdr_netobj *owner = &rlockowner->rl_owner; 3817 struct list_head matches; 3818 int i; 3819 __be32 status; 3820 3821 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 3822 clid->cl_boot, clid->cl_id); 3823 3824 /* XXX check for lease expiration */ 3825 3826 status = nfserr_stale_clientid; 3827 if (STALE_CLIENTID(clid)) 3828 return status; 3829 3830 nfs4_lock_state(); 3831 3832 status = nfserr_locks_held; 3833 /* XXX: we're doing a linear search through all the lockowners. 3834 * Yipes! For now we'll just hope clients aren't really using 3835 * release_lockowner much, but eventually we have to fix these 3836 * data structures. */ 3837 INIT_LIST_HEAD(&matches); 3838 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3839 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { 3840 if (!same_owner_str(sop, owner, clid)) 3841 continue; 3842 list_for_each_entry(stp, &sop->so_stateids, 3843 st_perstateowner) { 3844 if (check_for_locks(stp->st_vfs_file, sop)) 3845 goto out; 3846 /* Note: so_perclient unused for lockowners, 3847 * so it's OK to fool with here. */ 3848 list_add(&sop->so_perclient, &matches); 3849 } 3850 } 3851 } 3852 /* Clients probably won't expect us to return with some (but not all) 3853 * of the lockowner state released; so don't release any until all 3854 * have been checked. */ 3855 status = nfs_ok; 3856 while (!list_empty(&matches)) { 3857 sop = list_entry(matches.next, struct nfs4_stateowner, 3858 so_perclient); 3859 /* unhash_stateowner deletes so_perclient only 3860 * for openowners. */ 3861 list_del(&sop->so_perclient); 3862 release_lockowner(sop); 3863 } 3864 out: 3865 nfs4_unlock_state(); 3866 return status; 3867 } 3868 3869 static inline struct nfs4_client_reclaim * 3870 alloc_reclaim(void) 3871 { 3872 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 3873 } 3874 3875 int 3876 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id) 3877 { 3878 unsigned int strhashval = clientstr_hashval(name); 3879 struct nfs4_client *clp; 3880 3881 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id); 3882 return clp ? 1 : 0; 3883 } 3884 3885 /* 3886 * failure => all reset bets are off, nfserr_no_grace... 3887 */ 3888 int 3889 nfs4_client_to_reclaim(const char *name) 3890 { 3891 unsigned int strhashval; 3892 struct nfs4_client_reclaim *crp = NULL; 3893 3894 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 3895 crp = alloc_reclaim(); 3896 if (!crp) 3897 return 0; 3898 strhashval = clientstr_hashval(name); 3899 INIT_LIST_HEAD(&crp->cr_strhash); 3900 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 3901 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 3902 reclaim_str_hashtbl_size++; 3903 return 1; 3904 } 3905 3906 static void 3907 nfs4_release_reclaim(void) 3908 { 3909 struct nfs4_client_reclaim *crp = NULL; 3910 int i; 3911 3912 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3913 while (!list_empty(&reclaim_str_hashtbl[i])) { 3914 crp = list_entry(reclaim_str_hashtbl[i].next, 3915 struct nfs4_client_reclaim, cr_strhash); 3916 list_del(&crp->cr_strhash); 3917 kfree(crp); 3918 reclaim_str_hashtbl_size--; 3919 } 3920 } 3921 BUG_ON(reclaim_str_hashtbl_size); 3922 } 3923 3924 /* 3925 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 3926 static struct nfs4_client_reclaim * 3927 nfs4_find_reclaim_client(clientid_t *clid) 3928 { 3929 unsigned int strhashval; 3930 struct nfs4_client *clp; 3931 struct nfs4_client_reclaim *crp = NULL; 3932 3933 3934 /* find clientid in conf_id_hashtbl */ 3935 clp = find_confirmed_client(clid); 3936 if (clp == NULL) 3937 return NULL; 3938 3939 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", 3940 clp->cl_name.len, clp->cl_name.data, 3941 clp->cl_recdir); 3942 3943 /* find clp->cl_name in reclaim_str_hashtbl */ 3944 strhashval = clientstr_hashval(clp->cl_recdir); 3945 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 3946 if (same_name(crp->cr_recdir, clp->cl_recdir)) { 3947 return crp; 3948 } 3949 } 3950 return NULL; 3951 } 3952 3953 /* 3954 * Called from OPEN. Look for clientid in reclaim list. 3955 */ 3956 __be32 3957 nfs4_check_open_reclaim(clientid_t *clid) 3958 { 3959 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; 3960 } 3961 3962 /* initialization to perform at module load time: */ 3963 3964 int 3965 nfs4_state_init(void) 3966 { 3967 int i, status; 3968 3969 status = nfsd4_init_slabs(); 3970 if (status) 3971 return status; 3972 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 3973 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 3974 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 3975 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 3976 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 3977 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 3978 } 3979 for (i = 0; i < SESSION_HASH_SIZE; i++) 3980 INIT_LIST_HEAD(&sessionid_hashtbl[i]); 3981 for (i = 0; i < FILE_HASH_SIZE; i++) { 3982 INIT_LIST_HEAD(&file_hashtbl[i]); 3983 } 3984 for (i = 0; i < OWNER_HASH_SIZE; i++) { 3985 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 3986 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 3987 } 3988 for (i = 0; i < STATEID_HASH_SIZE; i++) { 3989 INIT_LIST_HEAD(&stateid_hashtbl[i]); 3990 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 3991 } 3992 for (i = 0; i < LOCK_HASH_SIZE; i++) { 3993 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 3994 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 3995 } 3996 memset(&onestateid, ~0, sizeof(stateid_t)); 3997 INIT_LIST_HEAD(&close_lru); 3998 INIT_LIST_HEAD(&client_lru); 3999 INIT_LIST_HEAD(&del_recall_lru); 4000 reclaim_str_hashtbl_size = 0; 4001 return 0; 4002 } 4003 4004 static void 4005 nfsd4_load_reboot_recovery_data(void) 4006 { 4007 int status; 4008 4009 nfs4_lock_state(); 4010 nfsd4_init_recdir(user_recovery_dirname); 4011 status = nfsd4_recdir_load(); 4012 nfs4_unlock_state(); 4013 if (status) 4014 printk("NFSD: Failure reading reboot recovery data\n"); 4015 } 4016 4017 /* 4018 * Since the lifetime of a delegation isn't limited to that of an open, a 4019 * client may quite reasonably hang on to a delegation as long as it has 4020 * the inode cached. This becomes an obvious problem the first time a 4021 * client's inode cache approaches the size of the server's total memory. 4022 * 4023 * For now we avoid this problem by imposing a hard limit on the number 4024 * of delegations, which varies according to the server's memory size. 4025 */ 4026 static void 4027 set_max_delegations(void) 4028 { 4029 /* 4030 * Allow at most 4 delegations per megabyte of RAM. Quick 4031 * estimates suggest that in the worst case (where every delegation 4032 * is for a different inode), a delegation could take about 1.5K, 4033 * giving a worst case usage of about 6% of memory. 4034 */ 4035 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); 4036 } 4037 4038 /* initialization to perform when the nfsd service is started: */ 4039 4040 static int 4041 __nfs4_state_start(void) 4042 { 4043 int ret; 4044 4045 boot_time = get_seconds(); 4046 locks_start_grace(&nfsd4_manager); 4047 printk(KERN_INFO "NFSD: starting %ld-second grace period\n", 4048 nfsd4_grace); 4049 ret = set_callback_cred(); 4050 if (ret) 4051 return -ENOMEM; 4052 laundry_wq = create_singlethread_workqueue("nfsd4"); 4053 if (laundry_wq == NULL) 4054 return -ENOMEM; 4055 ret = nfsd4_create_callback_queue(); 4056 if (ret) 4057 goto out_free_laundry; 4058 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ); 4059 set_max_delegations(); 4060 return 0; 4061 out_free_laundry: 4062 destroy_workqueue(laundry_wq); 4063 return ret; 4064 } 4065 4066 int 4067 nfs4_state_start(void) 4068 { 4069 int ret; 4070 4071 if (nfs4_init) 4072 return 0; 4073 nfsd4_load_reboot_recovery_data(); 4074 ret = __nfs4_state_start(); 4075 if (ret) 4076 return ret; 4077 nfs4_init = 1; 4078 return 0; 4079 } 4080 4081 static void 4082 __nfs4_state_shutdown(void) 4083 { 4084 int i; 4085 struct nfs4_client *clp = NULL; 4086 struct nfs4_delegation *dp = NULL; 4087 struct list_head *pos, *next, reaplist; 4088 4089 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 4090 while (!list_empty(&conf_id_hashtbl[i])) { 4091 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 4092 expire_client(clp); 4093 } 4094 while (!list_empty(&unconf_str_hashtbl[i])) { 4095 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 4096 expire_client(clp); 4097 } 4098 } 4099 INIT_LIST_HEAD(&reaplist); 4100 spin_lock(&recall_lock); 4101 list_for_each_safe(pos, next, &del_recall_lru) { 4102 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4103 list_move(&dp->dl_recall_lru, &reaplist); 4104 } 4105 spin_unlock(&recall_lock); 4106 list_for_each_safe(pos, next, &reaplist) { 4107 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4108 list_del_init(&dp->dl_recall_lru); 4109 unhash_delegation(dp); 4110 } 4111 4112 nfsd4_shutdown_recdir(); 4113 nfs4_init = 0; 4114 } 4115 4116 void 4117 nfs4_state_shutdown(void) 4118 { 4119 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); 4120 destroy_workqueue(laundry_wq); 4121 locks_end_grace(&nfsd4_manager); 4122 nfs4_lock_state(); 4123 nfs4_release_reclaim(); 4124 __nfs4_state_shutdown(); 4125 nfs4_unlock_state(); 4126 nfsd4_destroy_callback_queue(); 4127 } 4128 4129 /* 4130 * user_recovery_dirname is protected by the nfsd_mutex since it's only 4131 * accessed when nfsd is starting. 4132 */ 4133 static void 4134 nfs4_set_recdir(char *recdir) 4135 { 4136 strcpy(user_recovery_dirname, recdir); 4137 } 4138 4139 /* 4140 * Change the NFSv4 recovery directory to recdir. 4141 */ 4142 int 4143 nfs4_reset_recoverydir(char *recdir) 4144 { 4145 int status; 4146 struct path path; 4147 4148 status = kern_path(recdir, LOOKUP_FOLLOW, &path); 4149 if (status) 4150 return status; 4151 status = -ENOTDIR; 4152 if (S_ISDIR(path.dentry->d_inode->i_mode)) { 4153 nfs4_set_recdir(recdir); 4154 status = 0; 4155 } 4156 path_put(&path); 4157 return status; 4158 } 4159 4160 char * 4161 nfs4_recoverydir(void) 4162 { 4163 return user_recovery_dirname; 4164 } 4165