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/fs.h> 37 #include <linux/slab.h> 38 #include <linux/namei.h> 39 #include <linux/swap.h> 40 #include <linux/pagemap.h> 41 #include <linux/ratelimit.h> 42 #include <linux/sunrpc/svcauth_gss.h> 43 #include <linux/sunrpc/addr.h> 44 #include <linux/jhash.h> 45 #include "xdr4.h" 46 #include "xdr4cb.h" 47 #include "vfs.h" 48 #include "current_stateid.h" 49 50 #include "netns.h" 51 #include "pnfs.h" 52 53 #define NFSDDBG_FACILITY NFSDDBG_PROC 54 55 #define all_ones {{~0,~0},~0} 56 static const stateid_t one_stateid = { 57 .si_generation = ~0, 58 .si_opaque = all_ones, 59 }; 60 static const stateid_t zero_stateid = { 61 /* all fields zero */ 62 }; 63 static const stateid_t currentstateid = { 64 .si_generation = 1, 65 }; 66 67 static u64 current_sessionid = 1; 68 69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t))) 70 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t))) 71 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t))) 72 73 /* forward declarations */ 74 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner); 75 static void nfs4_free_ol_stateid(struct nfs4_stid *stid); 76 77 /* Locking: */ 78 79 /* 80 * Currently used for the del_recall_lru and file hash table. In an 81 * effort to decrease the scope of the client_mutex, this spinlock may 82 * eventually cover more: 83 */ 84 static DEFINE_SPINLOCK(state_lock); 85 86 /* 87 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for 88 * the refcount on the open stateid to drop. 89 */ 90 static DECLARE_WAIT_QUEUE_HEAD(close_wq); 91 92 static struct kmem_cache *openowner_slab; 93 static struct kmem_cache *lockowner_slab; 94 static struct kmem_cache *file_slab; 95 static struct kmem_cache *stateid_slab; 96 static struct kmem_cache *deleg_slab; 97 98 static void free_session(struct nfsd4_session *); 99 100 static struct nfsd4_callback_ops nfsd4_cb_recall_ops; 101 102 static bool is_session_dead(struct nfsd4_session *ses) 103 { 104 return ses->se_flags & NFS4_SESSION_DEAD; 105 } 106 107 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me) 108 { 109 if (atomic_read(&ses->se_ref) > ref_held_by_me) 110 return nfserr_jukebox; 111 ses->se_flags |= NFS4_SESSION_DEAD; 112 return nfs_ok; 113 } 114 115 static bool is_client_expired(struct nfs4_client *clp) 116 { 117 return clp->cl_time == 0; 118 } 119 120 static __be32 get_client_locked(struct nfs4_client *clp) 121 { 122 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 123 124 lockdep_assert_held(&nn->client_lock); 125 126 if (is_client_expired(clp)) 127 return nfserr_expired; 128 atomic_inc(&clp->cl_refcount); 129 return nfs_ok; 130 } 131 132 /* must be called under the client_lock */ 133 static inline void 134 renew_client_locked(struct nfs4_client *clp) 135 { 136 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 137 138 if (is_client_expired(clp)) { 139 WARN_ON(1); 140 printk("%s: client (clientid %08x/%08x) already expired\n", 141 __func__, 142 clp->cl_clientid.cl_boot, 143 clp->cl_clientid.cl_id); 144 return; 145 } 146 147 dprintk("renewing client (clientid %08x/%08x)\n", 148 clp->cl_clientid.cl_boot, 149 clp->cl_clientid.cl_id); 150 list_move_tail(&clp->cl_lru, &nn->client_lru); 151 clp->cl_time = get_seconds(); 152 } 153 154 static void put_client_renew_locked(struct nfs4_client *clp) 155 { 156 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 157 158 lockdep_assert_held(&nn->client_lock); 159 160 if (!atomic_dec_and_test(&clp->cl_refcount)) 161 return; 162 if (!is_client_expired(clp)) 163 renew_client_locked(clp); 164 } 165 166 static void put_client_renew(struct nfs4_client *clp) 167 { 168 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 169 170 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock)) 171 return; 172 if (!is_client_expired(clp)) 173 renew_client_locked(clp); 174 spin_unlock(&nn->client_lock); 175 } 176 177 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses) 178 { 179 __be32 status; 180 181 if (is_session_dead(ses)) 182 return nfserr_badsession; 183 status = get_client_locked(ses->se_client); 184 if (status) 185 return status; 186 atomic_inc(&ses->se_ref); 187 return nfs_ok; 188 } 189 190 static void nfsd4_put_session_locked(struct nfsd4_session *ses) 191 { 192 struct nfs4_client *clp = ses->se_client; 193 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 194 195 lockdep_assert_held(&nn->client_lock); 196 197 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses)) 198 free_session(ses); 199 put_client_renew_locked(clp); 200 } 201 202 static void nfsd4_put_session(struct nfsd4_session *ses) 203 { 204 struct nfs4_client *clp = ses->se_client; 205 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 206 207 spin_lock(&nn->client_lock); 208 nfsd4_put_session_locked(ses); 209 spin_unlock(&nn->client_lock); 210 } 211 212 static inline struct nfs4_stateowner * 213 nfs4_get_stateowner(struct nfs4_stateowner *sop) 214 { 215 atomic_inc(&sop->so_count); 216 return sop; 217 } 218 219 static int 220 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner) 221 { 222 return (sop->so_owner.len == owner->len) && 223 0 == memcmp(sop->so_owner.data, owner->data, owner->len); 224 } 225 226 static struct nfs4_openowner * 227 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open, 228 struct nfs4_client *clp) 229 { 230 struct nfs4_stateowner *so; 231 232 lockdep_assert_held(&clp->cl_lock); 233 234 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval], 235 so_strhash) { 236 if (!so->so_is_open_owner) 237 continue; 238 if (same_owner_str(so, &open->op_owner)) 239 return openowner(nfs4_get_stateowner(so)); 240 } 241 return NULL; 242 } 243 244 static struct nfs4_openowner * 245 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, 246 struct nfs4_client *clp) 247 { 248 struct nfs4_openowner *oo; 249 250 spin_lock(&clp->cl_lock); 251 oo = find_openstateowner_str_locked(hashval, open, clp); 252 spin_unlock(&clp->cl_lock); 253 return oo; 254 } 255 256 static inline u32 257 opaque_hashval(const void *ptr, int nbytes) 258 { 259 unsigned char *cptr = (unsigned char *) ptr; 260 261 u32 x = 0; 262 while (nbytes--) { 263 x *= 37; 264 x += *cptr++; 265 } 266 return x; 267 } 268 269 static void nfsd4_free_file_rcu(struct rcu_head *rcu) 270 { 271 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu); 272 273 kmem_cache_free(file_slab, fp); 274 } 275 276 void 277 put_nfs4_file(struct nfs4_file *fi) 278 { 279 might_lock(&state_lock); 280 281 if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) { 282 hlist_del_rcu(&fi->fi_hash); 283 spin_unlock(&state_lock); 284 WARN_ON_ONCE(!list_empty(&fi->fi_delegations)); 285 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu); 286 } 287 } 288 289 static struct file * 290 __nfs4_get_fd(struct nfs4_file *f, int oflag) 291 { 292 if (f->fi_fds[oflag]) 293 return get_file(f->fi_fds[oflag]); 294 return NULL; 295 } 296 297 static struct file * 298 find_writeable_file_locked(struct nfs4_file *f) 299 { 300 struct file *ret; 301 302 lockdep_assert_held(&f->fi_lock); 303 304 ret = __nfs4_get_fd(f, O_WRONLY); 305 if (!ret) 306 ret = __nfs4_get_fd(f, O_RDWR); 307 return ret; 308 } 309 310 static struct file * 311 find_writeable_file(struct nfs4_file *f) 312 { 313 struct file *ret; 314 315 spin_lock(&f->fi_lock); 316 ret = find_writeable_file_locked(f); 317 spin_unlock(&f->fi_lock); 318 319 return ret; 320 } 321 322 static struct file *find_readable_file_locked(struct nfs4_file *f) 323 { 324 struct file *ret; 325 326 lockdep_assert_held(&f->fi_lock); 327 328 ret = __nfs4_get_fd(f, O_RDONLY); 329 if (!ret) 330 ret = __nfs4_get_fd(f, O_RDWR); 331 return ret; 332 } 333 334 static struct file * 335 find_readable_file(struct nfs4_file *f) 336 { 337 struct file *ret; 338 339 spin_lock(&f->fi_lock); 340 ret = find_readable_file_locked(f); 341 spin_unlock(&f->fi_lock); 342 343 return ret; 344 } 345 346 struct file * 347 find_any_file(struct nfs4_file *f) 348 { 349 struct file *ret; 350 351 spin_lock(&f->fi_lock); 352 ret = __nfs4_get_fd(f, O_RDWR); 353 if (!ret) { 354 ret = __nfs4_get_fd(f, O_WRONLY); 355 if (!ret) 356 ret = __nfs4_get_fd(f, O_RDONLY); 357 } 358 spin_unlock(&f->fi_lock); 359 return ret; 360 } 361 362 static atomic_long_t num_delegations; 363 unsigned long max_delegations; 364 365 /* 366 * Open owner state (share locks) 367 */ 368 369 /* hash tables for lock and open owners */ 370 #define OWNER_HASH_BITS 8 371 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 372 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 373 374 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername) 375 { 376 unsigned int ret; 377 378 ret = opaque_hashval(ownername->data, ownername->len); 379 return ret & OWNER_HASH_MASK; 380 } 381 382 /* hash table for nfs4_file */ 383 #define FILE_HASH_BITS 8 384 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 385 386 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh) 387 { 388 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0); 389 } 390 391 static unsigned int file_hashval(struct knfsd_fh *fh) 392 { 393 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1); 394 } 395 396 static struct hlist_head file_hashtbl[FILE_HASH_SIZE]; 397 398 static void 399 __nfs4_file_get_access(struct nfs4_file *fp, u32 access) 400 { 401 lockdep_assert_held(&fp->fi_lock); 402 403 if (access & NFS4_SHARE_ACCESS_WRITE) 404 atomic_inc(&fp->fi_access[O_WRONLY]); 405 if (access & NFS4_SHARE_ACCESS_READ) 406 atomic_inc(&fp->fi_access[O_RDONLY]); 407 } 408 409 static __be32 410 nfs4_file_get_access(struct nfs4_file *fp, u32 access) 411 { 412 lockdep_assert_held(&fp->fi_lock); 413 414 /* Does this access mode make sense? */ 415 if (access & ~NFS4_SHARE_ACCESS_BOTH) 416 return nfserr_inval; 417 418 /* Does it conflict with a deny mode already set? */ 419 if ((access & fp->fi_share_deny) != 0) 420 return nfserr_share_denied; 421 422 __nfs4_file_get_access(fp, access); 423 return nfs_ok; 424 } 425 426 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny) 427 { 428 /* Common case is that there is no deny mode. */ 429 if (deny) { 430 /* Does this deny mode make sense? */ 431 if (deny & ~NFS4_SHARE_DENY_BOTH) 432 return nfserr_inval; 433 434 if ((deny & NFS4_SHARE_DENY_READ) && 435 atomic_read(&fp->fi_access[O_RDONLY])) 436 return nfserr_share_denied; 437 438 if ((deny & NFS4_SHARE_DENY_WRITE) && 439 atomic_read(&fp->fi_access[O_WRONLY])) 440 return nfserr_share_denied; 441 } 442 return nfs_ok; 443 } 444 445 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) 446 { 447 might_lock(&fp->fi_lock); 448 449 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) { 450 struct file *f1 = NULL; 451 struct file *f2 = NULL; 452 453 swap(f1, fp->fi_fds[oflag]); 454 if (atomic_read(&fp->fi_access[1 - oflag]) == 0) 455 swap(f2, fp->fi_fds[O_RDWR]); 456 spin_unlock(&fp->fi_lock); 457 if (f1) 458 fput(f1); 459 if (f2) 460 fput(f2); 461 } 462 } 463 464 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access) 465 { 466 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH); 467 468 if (access & NFS4_SHARE_ACCESS_WRITE) 469 __nfs4_file_put_access(fp, O_WRONLY); 470 if (access & NFS4_SHARE_ACCESS_READ) 471 __nfs4_file_put_access(fp, O_RDONLY); 472 } 473 474 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, 475 struct kmem_cache *slab) 476 { 477 struct nfs4_stid *stid; 478 int new_id; 479 480 stid = kmem_cache_zalloc(slab, GFP_KERNEL); 481 if (!stid) 482 return NULL; 483 484 idr_preload(GFP_KERNEL); 485 spin_lock(&cl->cl_lock); 486 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT); 487 spin_unlock(&cl->cl_lock); 488 idr_preload_end(); 489 if (new_id < 0) 490 goto out_free; 491 stid->sc_client = cl; 492 stid->sc_stateid.si_opaque.so_id = new_id; 493 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid; 494 /* Will be incremented before return to client: */ 495 atomic_set(&stid->sc_count, 1); 496 497 /* 498 * It shouldn't be a problem to reuse an opaque stateid value. 499 * I don't think it is for 4.1. But with 4.0 I worry that, for 500 * example, a stray write retransmission could be accepted by 501 * the server when it should have been rejected. Therefore, 502 * adopt a trick from the sctp code to attempt to maximize the 503 * amount of time until an id is reused, by ensuring they always 504 * "increase" (mod INT_MAX): 505 */ 506 return stid; 507 out_free: 508 kmem_cache_free(slab, stid); 509 return NULL; 510 } 511 512 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp) 513 { 514 struct nfs4_stid *stid; 515 struct nfs4_ol_stateid *stp; 516 517 stid = nfs4_alloc_stid(clp, stateid_slab); 518 if (!stid) 519 return NULL; 520 521 stp = openlockstateid(stid); 522 stp->st_stid.sc_free = nfs4_free_ol_stateid; 523 return stp; 524 } 525 526 static void nfs4_free_deleg(struct nfs4_stid *stid) 527 { 528 kmem_cache_free(deleg_slab, stid); 529 atomic_long_dec(&num_delegations); 530 } 531 532 /* 533 * When we recall a delegation, we should be careful not to hand it 534 * out again straight away. 535 * To ensure this we keep a pair of bloom filters ('new' and 'old') 536 * in which the filehandles of recalled delegations are "stored". 537 * If a filehandle appear in either filter, a delegation is blocked. 538 * When a delegation is recalled, the filehandle is stored in the "new" 539 * filter. 540 * Every 30 seconds we swap the filters and clear the "new" one, 541 * unless both are empty of course. 542 * 543 * Each filter is 256 bits. We hash the filehandle to 32bit and use the 544 * low 3 bytes as hash-table indices. 545 * 546 * 'blocked_delegations_lock', which is always taken in block_delegations(), 547 * is used to manage concurrent access. Testing does not need the lock 548 * except when swapping the two filters. 549 */ 550 static DEFINE_SPINLOCK(blocked_delegations_lock); 551 static struct bloom_pair { 552 int entries, old_entries; 553 time_t swap_time; 554 int new; /* index into 'set' */ 555 DECLARE_BITMAP(set[2], 256); 556 } blocked_delegations; 557 558 static int delegation_blocked(struct knfsd_fh *fh) 559 { 560 u32 hash; 561 struct bloom_pair *bd = &blocked_delegations; 562 563 if (bd->entries == 0) 564 return 0; 565 if (seconds_since_boot() - bd->swap_time > 30) { 566 spin_lock(&blocked_delegations_lock); 567 if (seconds_since_boot() - bd->swap_time > 30) { 568 bd->entries -= bd->old_entries; 569 bd->old_entries = bd->entries; 570 memset(bd->set[bd->new], 0, 571 sizeof(bd->set[0])); 572 bd->new = 1-bd->new; 573 bd->swap_time = seconds_since_boot(); 574 } 575 spin_unlock(&blocked_delegations_lock); 576 } 577 hash = jhash(&fh->fh_base, fh->fh_size, 0); 578 if (test_bit(hash&255, bd->set[0]) && 579 test_bit((hash>>8)&255, bd->set[0]) && 580 test_bit((hash>>16)&255, bd->set[0])) 581 return 1; 582 583 if (test_bit(hash&255, bd->set[1]) && 584 test_bit((hash>>8)&255, bd->set[1]) && 585 test_bit((hash>>16)&255, bd->set[1])) 586 return 1; 587 588 return 0; 589 } 590 591 static void block_delegations(struct knfsd_fh *fh) 592 { 593 u32 hash; 594 struct bloom_pair *bd = &blocked_delegations; 595 596 hash = jhash(&fh->fh_base, fh->fh_size, 0); 597 598 spin_lock(&blocked_delegations_lock); 599 __set_bit(hash&255, bd->set[bd->new]); 600 __set_bit((hash>>8)&255, bd->set[bd->new]); 601 __set_bit((hash>>16)&255, bd->set[bd->new]); 602 if (bd->entries == 0) 603 bd->swap_time = seconds_since_boot(); 604 bd->entries += 1; 605 spin_unlock(&blocked_delegations_lock); 606 } 607 608 static struct nfs4_delegation * 609 alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh) 610 { 611 struct nfs4_delegation *dp; 612 long n; 613 614 dprintk("NFSD alloc_init_deleg\n"); 615 n = atomic_long_inc_return(&num_delegations); 616 if (n < 0 || n > max_delegations) 617 goto out_dec; 618 if (delegation_blocked(¤t_fh->fh_handle)) 619 goto out_dec; 620 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab)); 621 if (dp == NULL) 622 goto out_dec; 623 624 dp->dl_stid.sc_free = nfs4_free_deleg; 625 /* 626 * delegation seqid's are never incremented. The 4.1 special 627 * meaning of seqid 0 isn't meaningful, really, but let's avoid 628 * 0 anyway just for consistency and use 1: 629 */ 630 dp->dl_stid.sc_stateid.si_generation = 1; 631 INIT_LIST_HEAD(&dp->dl_perfile); 632 INIT_LIST_HEAD(&dp->dl_perclnt); 633 INIT_LIST_HEAD(&dp->dl_recall_lru); 634 dp->dl_type = NFS4_OPEN_DELEGATE_READ; 635 dp->dl_retries = 1; 636 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client, 637 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL); 638 return dp; 639 out_dec: 640 atomic_long_dec(&num_delegations); 641 return NULL; 642 } 643 644 void 645 nfs4_put_stid(struct nfs4_stid *s) 646 { 647 struct nfs4_file *fp = s->sc_file; 648 struct nfs4_client *clp = s->sc_client; 649 650 might_lock(&clp->cl_lock); 651 652 if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) { 653 wake_up_all(&close_wq); 654 return; 655 } 656 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); 657 spin_unlock(&clp->cl_lock); 658 s->sc_free(s); 659 if (fp) 660 put_nfs4_file(fp); 661 } 662 663 static void nfs4_put_deleg_lease(struct nfs4_file *fp) 664 { 665 struct file *filp = NULL; 666 667 spin_lock(&fp->fi_lock); 668 if (fp->fi_deleg_file && --fp->fi_delegees == 0) 669 swap(filp, fp->fi_deleg_file); 670 spin_unlock(&fp->fi_lock); 671 672 if (filp) { 673 vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp); 674 fput(filp); 675 } 676 } 677 678 void nfs4_unhash_stid(struct nfs4_stid *s) 679 { 680 s->sc_type = 0; 681 } 682 683 static void 684 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp) 685 { 686 lockdep_assert_held(&state_lock); 687 lockdep_assert_held(&fp->fi_lock); 688 689 atomic_inc(&dp->dl_stid.sc_count); 690 dp->dl_stid.sc_type = NFS4_DELEG_STID; 691 list_add(&dp->dl_perfile, &fp->fi_delegations); 692 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations); 693 } 694 695 static void 696 unhash_delegation_locked(struct nfs4_delegation *dp) 697 { 698 struct nfs4_file *fp = dp->dl_stid.sc_file; 699 700 lockdep_assert_held(&state_lock); 701 702 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID; 703 /* Ensure that deleg break won't try to requeue it */ 704 ++dp->dl_time; 705 spin_lock(&fp->fi_lock); 706 list_del_init(&dp->dl_perclnt); 707 list_del_init(&dp->dl_recall_lru); 708 list_del_init(&dp->dl_perfile); 709 spin_unlock(&fp->fi_lock); 710 } 711 712 static void destroy_delegation(struct nfs4_delegation *dp) 713 { 714 spin_lock(&state_lock); 715 unhash_delegation_locked(dp); 716 spin_unlock(&state_lock); 717 nfs4_put_deleg_lease(dp->dl_stid.sc_file); 718 nfs4_put_stid(&dp->dl_stid); 719 } 720 721 static void revoke_delegation(struct nfs4_delegation *dp) 722 { 723 struct nfs4_client *clp = dp->dl_stid.sc_client; 724 725 WARN_ON(!list_empty(&dp->dl_recall_lru)); 726 727 nfs4_put_deleg_lease(dp->dl_stid.sc_file); 728 729 if (clp->cl_minorversion == 0) 730 nfs4_put_stid(&dp->dl_stid); 731 else { 732 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID; 733 spin_lock(&clp->cl_lock); 734 list_add(&dp->dl_recall_lru, &clp->cl_revoked); 735 spin_unlock(&clp->cl_lock); 736 } 737 } 738 739 /* 740 * SETCLIENTID state 741 */ 742 743 static unsigned int clientid_hashval(u32 id) 744 { 745 return id & CLIENT_HASH_MASK; 746 } 747 748 static unsigned int clientstr_hashval(const char *name) 749 { 750 return opaque_hashval(name, 8) & CLIENT_HASH_MASK; 751 } 752 753 /* 754 * We store the NONE, READ, WRITE, and BOTH bits separately in the 755 * st_{access,deny}_bmap field of the stateid, in order to track not 756 * only what share bits are currently in force, but also what 757 * combinations of share bits previous opens have used. This allows us 758 * to enforce the recommendation of rfc 3530 14.2.19 that the server 759 * return an error if the client attempt to downgrade to a combination 760 * of share bits not explicable by closing some of its previous opens. 761 * 762 * XXX: This enforcement is actually incomplete, since we don't keep 763 * track of access/deny bit combinations; so, e.g., we allow: 764 * 765 * OPEN allow read, deny write 766 * OPEN allow both, deny none 767 * DOWNGRADE allow read, deny none 768 * 769 * which we should reject. 770 */ 771 static unsigned int 772 bmap_to_share_mode(unsigned long bmap) { 773 int i; 774 unsigned int access = 0; 775 776 for (i = 1; i < 4; i++) { 777 if (test_bit(i, &bmap)) 778 access |= i; 779 } 780 return access; 781 } 782 783 /* set share access for a given stateid */ 784 static inline void 785 set_access(u32 access, struct nfs4_ol_stateid *stp) 786 { 787 unsigned char mask = 1 << access; 788 789 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); 790 stp->st_access_bmap |= mask; 791 } 792 793 /* clear share access for a given stateid */ 794 static inline void 795 clear_access(u32 access, struct nfs4_ol_stateid *stp) 796 { 797 unsigned char mask = 1 << access; 798 799 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); 800 stp->st_access_bmap &= ~mask; 801 } 802 803 /* test whether a given stateid has access */ 804 static inline bool 805 test_access(u32 access, struct nfs4_ol_stateid *stp) 806 { 807 unsigned char mask = 1 << access; 808 809 return (bool)(stp->st_access_bmap & mask); 810 } 811 812 /* set share deny for a given stateid */ 813 static inline void 814 set_deny(u32 deny, struct nfs4_ol_stateid *stp) 815 { 816 unsigned char mask = 1 << deny; 817 818 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); 819 stp->st_deny_bmap |= mask; 820 } 821 822 /* clear share deny for a given stateid */ 823 static inline void 824 clear_deny(u32 deny, struct nfs4_ol_stateid *stp) 825 { 826 unsigned char mask = 1 << deny; 827 828 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); 829 stp->st_deny_bmap &= ~mask; 830 } 831 832 /* test whether a given stateid is denying specific access */ 833 static inline bool 834 test_deny(u32 deny, struct nfs4_ol_stateid *stp) 835 { 836 unsigned char mask = 1 << deny; 837 838 return (bool)(stp->st_deny_bmap & mask); 839 } 840 841 static int nfs4_access_to_omode(u32 access) 842 { 843 switch (access & NFS4_SHARE_ACCESS_BOTH) { 844 case NFS4_SHARE_ACCESS_READ: 845 return O_RDONLY; 846 case NFS4_SHARE_ACCESS_WRITE: 847 return O_WRONLY; 848 case NFS4_SHARE_ACCESS_BOTH: 849 return O_RDWR; 850 } 851 WARN_ON_ONCE(1); 852 return O_RDONLY; 853 } 854 855 /* 856 * A stateid that had a deny mode associated with it is being released 857 * or downgraded. Recalculate the deny mode on the file. 858 */ 859 static void 860 recalculate_deny_mode(struct nfs4_file *fp) 861 { 862 struct nfs4_ol_stateid *stp; 863 864 spin_lock(&fp->fi_lock); 865 fp->fi_share_deny = 0; 866 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) 867 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap); 868 spin_unlock(&fp->fi_lock); 869 } 870 871 static void 872 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp) 873 { 874 int i; 875 bool change = false; 876 877 for (i = 1; i < 4; i++) { 878 if ((i & deny) != i) { 879 change = true; 880 clear_deny(i, stp); 881 } 882 } 883 884 /* Recalculate per-file deny mode if there was a change */ 885 if (change) 886 recalculate_deny_mode(stp->st_stid.sc_file); 887 } 888 889 /* release all access and file references for a given stateid */ 890 static void 891 release_all_access(struct nfs4_ol_stateid *stp) 892 { 893 int i; 894 struct nfs4_file *fp = stp->st_stid.sc_file; 895 896 if (fp && stp->st_deny_bmap != 0) 897 recalculate_deny_mode(fp); 898 899 for (i = 1; i < 4; i++) { 900 if (test_access(i, stp)) 901 nfs4_file_put_access(stp->st_stid.sc_file, i); 902 clear_access(i, stp); 903 } 904 } 905 906 static void nfs4_put_stateowner(struct nfs4_stateowner *sop) 907 { 908 struct nfs4_client *clp = sop->so_client; 909 910 might_lock(&clp->cl_lock); 911 912 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock)) 913 return; 914 sop->so_ops->so_unhash(sop); 915 spin_unlock(&clp->cl_lock); 916 kfree(sop->so_owner.data); 917 sop->so_ops->so_free(sop); 918 } 919 920 static void unhash_ol_stateid(struct nfs4_ol_stateid *stp) 921 { 922 struct nfs4_file *fp = stp->st_stid.sc_file; 923 924 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock); 925 926 spin_lock(&fp->fi_lock); 927 list_del(&stp->st_perfile); 928 spin_unlock(&fp->fi_lock); 929 list_del(&stp->st_perstateowner); 930 } 931 932 static void nfs4_free_ol_stateid(struct nfs4_stid *stid) 933 { 934 struct nfs4_ol_stateid *stp = openlockstateid(stid); 935 936 release_all_access(stp); 937 if (stp->st_stateowner) 938 nfs4_put_stateowner(stp->st_stateowner); 939 kmem_cache_free(stateid_slab, stid); 940 } 941 942 static void nfs4_free_lock_stateid(struct nfs4_stid *stid) 943 { 944 struct nfs4_ol_stateid *stp = openlockstateid(stid); 945 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner); 946 struct file *file; 947 948 file = find_any_file(stp->st_stid.sc_file); 949 if (file) 950 filp_close(file, (fl_owner_t)lo); 951 nfs4_free_ol_stateid(stid); 952 } 953 954 /* 955 * Put the persistent reference to an already unhashed generic stateid, while 956 * holding the cl_lock. If it's the last reference, then put it onto the 957 * reaplist for later destruction. 958 */ 959 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp, 960 struct list_head *reaplist) 961 { 962 struct nfs4_stid *s = &stp->st_stid; 963 struct nfs4_client *clp = s->sc_client; 964 965 lockdep_assert_held(&clp->cl_lock); 966 967 WARN_ON_ONCE(!list_empty(&stp->st_locks)); 968 969 if (!atomic_dec_and_test(&s->sc_count)) { 970 wake_up_all(&close_wq); 971 return; 972 } 973 974 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); 975 list_add(&stp->st_locks, reaplist); 976 } 977 978 static void unhash_lock_stateid(struct nfs4_ol_stateid *stp) 979 { 980 struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner); 981 982 lockdep_assert_held(&oo->oo_owner.so_client->cl_lock); 983 984 list_del_init(&stp->st_locks); 985 unhash_ol_stateid(stp); 986 nfs4_unhash_stid(&stp->st_stid); 987 } 988 989 static void release_lock_stateid(struct nfs4_ol_stateid *stp) 990 { 991 struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner); 992 993 spin_lock(&oo->oo_owner.so_client->cl_lock); 994 unhash_lock_stateid(stp); 995 spin_unlock(&oo->oo_owner.so_client->cl_lock); 996 nfs4_put_stid(&stp->st_stid); 997 } 998 999 static void unhash_lockowner_locked(struct nfs4_lockowner *lo) 1000 { 1001 struct nfs4_client *clp = lo->lo_owner.so_client; 1002 1003 lockdep_assert_held(&clp->cl_lock); 1004 1005 list_del_init(&lo->lo_owner.so_strhash); 1006 } 1007 1008 /* 1009 * Free a list of generic stateids that were collected earlier after being 1010 * fully unhashed. 1011 */ 1012 static void 1013 free_ol_stateid_reaplist(struct list_head *reaplist) 1014 { 1015 struct nfs4_ol_stateid *stp; 1016 struct nfs4_file *fp; 1017 1018 might_sleep(); 1019 1020 while (!list_empty(reaplist)) { 1021 stp = list_first_entry(reaplist, struct nfs4_ol_stateid, 1022 st_locks); 1023 list_del(&stp->st_locks); 1024 fp = stp->st_stid.sc_file; 1025 stp->st_stid.sc_free(&stp->st_stid); 1026 if (fp) 1027 put_nfs4_file(fp); 1028 } 1029 } 1030 1031 static void release_lockowner(struct nfs4_lockowner *lo) 1032 { 1033 struct nfs4_client *clp = lo->lo_owner.so_client; 1034 struct nfs4_ol_stateid *stp; 1035 struct list_head reaplist; 1036 1037 INIT_LIST_HEAD(&reaplist); 1038 1039 spin_lock(&clp->cl_lock); 1040 unhash_lockowner_locked(lo); 1041 while (!list_empty(&lo->lo_owner.so_stateids)) { 1042 stp = list_first_entry(&lo->lo_owner.so_stateids, 1043 struct nfs4_ol_stateid, st_perstateowner); 1044 unhash_lock_stateid(stp); 1045 put_ol_stateid_locked(stp, &reaplist); 1046 } 1047 spin_unlock(&clp->cl_lock); 1048 free_ol_stateid_reaplist(&reaplist); 1049 nfs4_put_stateowner(&lo->lo_owner); 1050 } 1051 1052 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp, 1053 struct list_head *reaplist) 1054 { 1055 struct nfs4_ol_stateid *stp; 1056 1057 while (!list_empty(&open_stp->st_locks)) { 1058 stp = list_entry(open_stp->st_locks.next, 1059 struct nfs4_ol_stateid, st_locks); 1060 unhash_lock_stateid(stp); 1061 put_ol_stateid_locked(stp, reaplist); 1062 } 1063 } 1064 1065 static void unhash_open_stateid(struct nfs4_ol_stateid *stp, 1066 struct list_head *reaplist) 1067 { 1068 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); 1069 1070 unhash_ol_stateid(stp); 1071 release_open_stateid_locks(stp, reaplist); 1072 } 1073 1074 static void release_open_stateid(struct nfs4_ol_stateid *stp) 1075 { 1076 LIST_HEAD(reaplist); 1077 1078 spin_lock(&stp->st_stid.sc_client->cl_lock); 1079 unhash_open_stateid(stp, &reaplist); 1080 put_ol_stateid_locked(stp, &reaplist); 1081 spin_unlock(&stp->st_stid.sc_client->cl_lock); 1082 free_ol_stateid_reaplist(&reaplist); 1083 } 1084 1085 static void unhash_openowner_locked(struct nfs4_openowner *oo) 1086 { 1087 struct nfs4_client *clp = oo->oo_owner.so_client; 1088 1089 lockdep_assert_held(&clp->cl_lock); 1090 1091 list_del_init(&oo->oo_owner.so_strhash); 1092 list_del_init(&oo->oo_perclient); 1093 } 1094 1095 static void release_last_closed_stateid(struct nfs4_openowner *oo) 1096 { 1097 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net, 1098 nfsd_net_id); 1099 struct nfs4_ol_stateid *s; 1100 1101 spin_lock(&nn->client_lock); 1102 s = oo->oo_last_closed_stid; 1103 if (s) { 1104 list_del_init(&oo->oo_close_lru); 1105 oo->oo_last_closed_stid = NULL; 1106 } 1107 spin_unlock(&nn->client_lock); 1108 if (s) 1109 nfs4_put_stid(&s->st_stid); 1110 } 1111 1112 static void release_openowner(struct nfs4_openowner *oo) 1113 { 1114 struct nfs4_ol_stateid *stp; 1115 struct nfs4_client *clp = oo->oo_owner.so_client; 1116 struct list_head reaplist; 1117 1118 INIT_LIST_HEAD(&reaplist); 1119 1120 spin_lock(&clp->cl_lock); 1121 unhash_openowner_locked(oo); 1122 while (!list_empty(&oo->oo_owner.so_stateids)) { 1123 stp = list_first_entry(&oo->oo_owner.so_stateids, 1124 struct nfs4_ol_stateid, st_perstateowner); 1125 unhash_open_stateid(stp, &reaplist); 1126 put_ol_stateid_locked(stp, &reaplist); 1127 } 1128 spin_unlock(&clp->cl_lock); 1129 free_ol_stateid_reaplist(&reaplist); 1130 release_last_closed_stateid(oo); 1131 nfs4_put_stateowner(&oo->oo_owner); 1132 } 1133 1134 static inline int 1135 hash_sessionid(struct nfs4_sessionid *sessionid) 1136 { 1137 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; 1138 1139 return sid->sequence % SESSION_HASH_SIZE; 1140 } 1141 1142 #ifdef NFSD_DEBUG 1143 static inline void 1144 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) 1145 { 1146 u32 *ptr = (u32 *)(&sessionid->data[0]); 1147 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); 1148 } 1149 #else 1150 static inline void 1151 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) 1152 { 1153 } 1154 #endif 1155 1156 /* 1157 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it 1158 * won't be used for replay. 1159 */ 1160 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr) 1161 { 1162 struct nfs4_stateowner *so = cstate->replay_owner; 1163 1164 if (nfserr == nfserr_replay_me) 1165 return; 1166 1167 if (!seqid_mutating_err(ntohl(nfserr))) { 1168 nfsd4_cstate_clear_replay(cstate); 1169 return; 1170 } 1171 if (!so) 1172 return; 1173 if (so->so_is_open_owner) 1174 release_last_closed_stateid(openowner(so)); 1175 so->so_seqid++; 1176 return; 1177 } 1178 1179 static void 1180 gen_sessionid(struct nfsd4_session *ses) 1181 { 1182 struct nfs4_client *clp = ses->se_client; 1183 struct nfsd4_sessionid *sid; 1184 1185 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; 1186 sid->clientid = clp->cl_clientid; 1187 sid->sequence = current_sessionid++; 1188 sid->reserved = 0; 1189 } 1190 1191 /* 1192 * The protocol defines ca_maxresponssize_cached to include the size of 1193 * the rpc header, but all we need to cache is the data starting after 1194 * the end of the initial SEQUENCE operation--the rest we regenerate 1195 * each time. Therefore we can advertise a ca_maxresponssize_cached 1196 * value that is the number of bytes in our cache plus a few additional 1197 * bytes. In order to stay on the safe side, and not promise more than 1198 * we can cache, those additional bytes must be the minimum possible: 24 1199 * bytes of rpc header (xid through accept state, with AUTH_NULL 1200 * verifier), 12 for the compound header (with zero-length tag), and 44 1201 * for the SEQUENCE op response: 1202 */ 1203 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) 1204 1205 static void 1206 free_session_slots(struct nfsd4_session *ses) 1207 { 1208 int i; 1209 1210 for (i = 0; i < ses->se_fchannel.maxreqs; i++) 1211 kfree(ses->se_slots[i]); 1212 } 1213 1214 /* 1215 * We don't actually need to cache the rpc and session headers, so we 1216 * can allocate a little less for each slot: 1217 */ 1218 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca) 1219 { 1220 u32 size; 1221 1222 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ) 1223 size = 0; 1224 else 1225 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; 1226 return size + sizeof(struct nfsd4_slot); 1227 } 1228 1229 /* 1230 * XXX: If we run out of reserved DRC memory we could (up to a point) 1231 * re-negotiate active sessions and reduce their slot usage to make 1232 * room for new connections. For now we just fail the create session. 1233 */ 1234 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca) 1235 { 1236 u32 slotsize = slot_bytes(ca); 1237 u32 num = ca->maxreqs; 1238 int avail; 1239 1240 spin_lock(&nfsd_drc_lock); 1241 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, 1242 nfsd_drc_max_mem - nfsd_drc_mem_used); 1243 num = min_t(int, num, avail / slotsize); 1244 nfsd_drc_mem_used += num * slotsize; 1245 spin_unlock(&nfsd_drc_lock); 1246 1247 return num; 1248 } 1249 1250 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca) 1251 { 1252 int slotsize = slot_bytes(ca); 1253 1254 spin_lock(&nfsd_drc_lock); 1255 nfsd_drc_mem_used -= slotsize * ca->maxreqs; 1256 spin_unlock(&nfsd_drc_lock); 1257 } 1258 1259 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs, 1260 struct nfsd4_channel_attrs *battrs) 1261 { 1262 int numslots = fattrs->maxreqs; 1263 int slotsize = slot_bytes(fattrs); 1264 struct nfsd4_session *new; 1265 int mem, i; 1266 1267 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *) 1268 + sizeof(struct nfsd4_session) > PAGE_SIZE); 1269 mem = numslots * sizeof(struct nfsd4_slot *); 1270 1271 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL); 1272 if (!new) 1273 return NULL; 1274 /* allocate each struct nfsd4_slot and data cache in one piece */ 1275 for (i = 0; i < numslots; i++) { 1276 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL); 1277 if (!new->se_slots[i]) 1278 goto out_free; 1279 } 1280 1281 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs)); 1282 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs)); 1283 1284 return new; 1285 out_free: 1286 while (i--) 1287 kfree(new->se_slots[i]); 1288 kfree(new); 1289 return NULL; 1290 } 1291 1292 static void free_conn(struct nfsd4_conn *c) 1293 { 1294 svc_xprt_put(c->cn_xprt); 1295 kfree(c); 1296 } 1297 1298 static void nfsd4_conn_lost(struct svc_xpt_user *u) 1299 { 1300 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); 1301 struct nfs4_client *clp = c->cn_session->se_client; 1302 1303 spin_lock(&clp->cl_lock); 1304 if (!list_empty(&c->cn_persession)) { 1305 list_del(&c->cn_persession); 1306 free_conn(c); 1307 } 1308 nfsd4_probe_callback(clp); 1309 spin_unlock(&clp->cl_lock); 1310 } 1311 1312 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) 1313 { 1314 struct nfsd4_conn *conn; 1315 1316 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL); 1317 if (!conn) 1318 return NULL; 1319 svc_xprt_get(rqstp->rq_xprt); 1320 conn->cn_xprt = rqstp->rq_xprt; 1321 conn->cn_flags = flags; 1322 INIT_LIST_HEAD(&conn->cn_xpt_user.list); 1323 return conn; 1324 } 1325 1326 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) 1327 { 1328 conn->cn_session = ses; 1329 list_add(&conn->cn_persession, &ses->se_conns); 1330 } 1331 1332 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) 1333 { 1334 struct nfs4_client *clp = ses->se_client; 1335 1336 spin_lock(&clp->cl_lock); 1337 __nfsd4_hash_conn(conn, ses); 1338 spin_unlock(&clp->cl_lock); 1339 } 1340 1341 static int nfsd4_register_conn(struct nfsd4_conn *conn) 1342 { 1343 conn->cn_xpt_user.callback = nfsd4_conn_lost; 1344 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); 1345 } 1346 1347 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses) 1348 { 1349 int ret; 1350 1351 nfsd4_hash_conn(conn, ses); 1352 ret = nfsd4_register_conn(conn); 1353 if (ret) 1354 /* oops; xprt is already down: */ 1355 nfsd4_conn_lost(&conn->cn_xpt_user); 1356 /* We may have gained or lost a callback channel: */ 1357 nfsd4_probe_callback_sync(ses->se_client); 1358 } 1359 1360 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses) 1361 { 1362 u32 dir = NFS4_CDFC4_FORE; 1363 1364 if (cses->flags & SESSION4_BACK_CHAN) 1365 dir |= NFS4_CDFC4_BACK; 1366 return alloc_conn(rqstp, dir); 1367 } 1368 1369 /* must be called under client_lock */ 1370 static void nfsd4_del_conns(struct nfsd4_session *s) 1371 { 1372 struct nfs4_client *clp = s->se_client; 1373 struct nfsd4_conn *c; 1374 1375 spin_lock(&clp->cl_lock); 1376 while (!list_empty(&s->se_conns)) { 1377 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); 1378 list_del_init(&c->cn_persession); 1379 spin_unlock(&clp->cl_lock); 1380 1381 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); 1382 free_conn(c); 1383 1384 spin_lock(&clp->cl_lock); 1385 } 1386 spin_unlock(&clp->cl_lock); 1387 } 1388 1389 static void __free_session(struct nfsd4_session *ses) 1390 { 1391 free_session_slots(ses); 1392 kfree(ses); 1393 } 1394 1395 static void free_session(struct nfsd4_session *ses) 1396 { 1397 nfsd4_del_conns(ses); 1398 nfsd4_put_drc_mem(&ses->se_fchannel); 1399 __free_session(ses); 1400 } 1401 1402 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses) 1403 { 1404 int idx; 1405 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 1406 1407 new->se_client = clp; 1408 gen_sessionid(new); 1409 1410 INIT_LIST_HEAD(&new->se_conns); 1411 1412 new->se_cb_seq_nr = 1; 1413 new->se_flags = cses->flags; 1414 new->se_cb_prog = cses->callback_prog; 1415 new->se_cb_sec = cses->cb_sec; 1416 atomic_set(&new->se_ref, 0); 1417 idx = hash_sessionid(&new->se_sessionid); 1418 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]); 1419 spin_lock(&clp->cl_lock); 1420 list_add(&new->se_perclnt, &clp->cl_sessions); 1421 spin_unlock(&clp->cl_lock); 1422 1423 { 1424 struct sockaddr *sa = svc_addr(rqstp); 1425 /* 1426 * This is a little silly; with sessions there's no real 1427 * use for the callback address. Use the peer address 1428 * as a reasonable default for now, but consider fixing 1429 * the rpc client not to require an address in the 1430 * future: 1431 */ 1432 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); 1433 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); 1434 } 1435 } 1436 1437 /* caller must hold client_lock */ 1438 static struct nfsd4_session * 1439 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net) 1440 { 1441 struct nfsd4_session *elem; 1442 int idx; 1443 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1444 1445 lockdep_assert_held(&nn->client_lock); 1446 1447 dump_sessionid(__func__, sessionid); 1448 idx = hash_sessionid(sessionid); 1449 /* Search in the appropriate list */ 1450 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) { 1451 if (!memcmp(elem->se_sessionid.data, sessionid->data, 1452 NFS4_MAX_SESSIONID_LEN)) { 1453 return elem; 1454 } 1455 } 1456 1457 dprintk("%s: session not found\n", __func__); 1458 return NULL; 1459 } 1460 1461 static struct nfsd4_session * 1462 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net, 1463 __be32 *ret) 1464 { 1465 struct nfsd4_session *session; 1466 __be32 status = nfserr_badsession; 1467 1468 session = __find_in_sessionid_hashtbl(sessionid, net); 1469 if (!session) 1470 goto out; 1471 status = nfsd4_get_session_locked(session); 1472 if (status) 1473 session = NULL; 1474 out: 1475 *ret = status; 1476 return session; 1477 } 1478 1479 /* caller must hold client_lock */ 1480 static void 1481 unhash_session(struct nfsd4_session *ses) 1482 { 1483 struct nfs4_client *clp = ses->se_client; 1484 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1485 1486 lockdep_assert_held(&nn->client_lock); 1487 1488 list_del(&ses->se_hash); 1489 spin_lock(&ses->se_client->cl_lock); 1490 list_del(&ses->se_perclnt); 1491 spin_unlock(&ses->se_client->cl_lock); 1492 } 1493 1494 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 1495 static int 1496 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn) 1497 { 1498 /* 1499 * We're assuming the clid was not given out from a boot 1500 * precisely 2^32 (about 136 years) before this one. That seems 1501 * a safe assumption: 1502 */ 1503 if (clid->cl_boot == (u32)nn->boot_time) 1504 return 0; 1505 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", 1506 clid->cl_boot, clid->cl_id, nn->boot_time); 1507 return 1; 1508 } 1509 1510 /* 1511 * XXX Should we use a slab cache ? 1512 * This type of memory management is somewhat inefficient, but we use it 1513 * anyway since SETCLIENTID is not a common operation. 1514 */ 1515 static struct nfs4_client *alloc_client(struct xdr_netobj name) 1516 { 1517 struct nfs4_client *clp; 1518 int i; 1519 1520 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); 1521 if (clp == NULL) 1522 return NULL; 1523 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL); 1524 if (clp->cl_name.data == NULL) 1525 goto err_no_name; 1526 clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) * 1527 OWNER_HASH_SIZE, GFP_KERNEL); 1528 if (!clp->cl_ownerstr_hashtbl) 1529 goto err_no_hashtbl; 1530 for (i = 0; i < OWNER_HASH_SIZE; i++) 1531 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]); 1532 clp->cl_name.len = name.len; 1533 INIT_LIST_HEAD(&clp->cl_sessions); 1534 idr_init(&clp->cl_stateids); 1535 atomic_set(&clp->cl_refcount, 0); 1536 clp->cl_cb_state = NFSD4_CB_UNKNOWN; 1537 INIT_LIST_HEAD(&clp->cl_idhash); 1538 INIT_LIST_HEAD(&clp->cl_openowners); 1539 INIT_LIST_HEAD(&clp->cl_delegations); 1540 INIT_LIST_HEAD(&clp->cl_lru); 1541 INIT_LIST_HEAD(&clp->cl_callbacks); 1542 INIT_LIST_HEAD(&clp->cl_revoked); 1543 #ifdef CONFIG_NFSD_PNFS 1544 INIT_LIST_HEAD(&clp->cl_lo_states); 1545 #endif 1546 spin_lock_init(&clp->cl_lock); 1547 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); 1548 return clp; 1549 err_no_hashtbl: 1550 kfree(clp->cl_name.data); 1551 err_no_name: 1552 kfree(clp); 1553 return NULL; 1554 } 1555 1556 static void 1557 free_client(struct nfs4_client *clp) 1558 { 1559 while (!list_empty(&clp->cl_sessions)) { 1560 struct nfsd4_session *ses; 1561 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, 1562 se_perclnt); 1563 list_del(&ses->se_perclnt); 1564 WARN_ON_ONCE(atomic_read(&ses->se_ref)); 1565 free_session(ses); 1566 } 1567 rpc_destroy_wait_queue(&clp->cl_cb_waitq); 1568 free_svc_cred(&clp->cl_cred); 1569 kfree(clp->cl_ownerstr_hashtbl); 1570 kfree(clp->cl_name.data); 1571 idr_destroy(&clp->cl_stateids); 1572 kfree(clp); 1573 } 1574 1575 /* must be called under the client_lock */ 1576 static void 1577 unhash_client_locked(struct nfs4_client *clp) 1578 { 1579 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1580 struct nfsd4_session *ses; 1581 1582 lockdep_assert_held(&nn->client_lock); 1583 1584 /* Mark the client as expired! */ 1585 clp->cl_time = 0; 1586 /* Make it invisible */ 1587 if (!list_empty(&clp->cl_idhash)) { 1588 list_del_init(&clp->cl_idhash); 1589 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags)) 1590 rb_erase(&clp->cl_namenode, &nn->conf_name_tree); 1591 else 1592 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); 1593 } 1594 list_del_init(&clp->cl_lru); 1595 spin_lock(&clp->cl_lock); 1596 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) 1597 list_del_init(&ses->se_hash); 1598 spin_unlock(&clp->cl_lock); 1599 } 1600 1601 static void 1602 unhash_client(struct nfs4_client *clp) 1603 { 1604 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1605 1606 spin_lock(&nn->client_lock); 1607 unhash_client_locked(clp); 1608 spin_unlock(&nn->client_lock); 1609 } 1610 1611 static __be32 mark_client_expired_locked(struct nfs4_client *clp) 1612 { 1613 if (atomic_read(&clp->cl_refcount)) 1614 return nfserr_jukebox; 1615 unhash_client_locked(clp); 1616 return nfs_ok; 1617 } 1618 1619 static void 1620 __destroy_client(struct nfs4_client *clp) 1621 { 1622 struct nfs4_openowner *oo; 1623 struct nfs4_delegation *dp; 1624 struct list_head reaplist; 1625 1626 INIT_LIST_HEAD(&reaplist); 1627 spin_lock(&state_lock); 1628 while (!list_empty(&clp->cl_delegations)) { 1629 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 1630 unhash_delegation_locked(dp); 1631 list_add(&dp->dl_recall_lru, &reaplist); 1632 } 1633 spin_unlock(&state_lock); 1634 while (!list_empty(&reaplist)) { 1635 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 1636 list_del_init(&dp->dl_recall_lru); 1637 nfs4_put_deleg_lease(dp->dl_stid.sc_file); 1638 nfs4_put_stid(&dp->dl_stid); 1639 } 1640 while (!list_empty(&clp->cl_revoked)) { 1641 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru); 1642 list_del_init(&dp->dl_recall_lru); 1643 nfs4_put_stid(&dp->dl_stid); 1644 } 1645 while (!list_empty(&clp->cl_openowners)) { 1646 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient); 1647 nfs4_get_stateowner(&oo->oo_owner); 1648 release_openowner(oo); 1649 } 1650 nfsd4_return_all_client_layouts(clp); 1651 nfsd4_shutdown_callback(clp); 1652 if (clp->cl_cb_conn.cb_xprt) 1653 svc_xprt_put(clp->cl_cb_conn.cb_xprt); 1654 free_client(clp); 1655 } 1656 1657 static void 1658 destroy_client(struct nfs4_client *clp) 1659 { 1660 unhash_client(clp); 1661 __destroy_client(clp); 1662 } 1663 1664 static void expire_client(struct nfs4_client *clp) 1665 { 1666 unhash_client(clp); 1667 nfsd4_client_record_remove(clp); 1668 __destroy_client(clp); 1669 } 1670 1671 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) 1672 { 1673 memcpy(target->cl_verifier.data, source->data, 1674 sizeof(target->cl_verifier.data)); 1675 } 1676 1677 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) 1678 { 1679 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 1680 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 1681 } 1682 1683 static int copy_cred(struct svc_cred *target, struct svc_cred *source) 1684 { 1685 if (source->cr_principal) { 1686 target->cr_principal = 1687 kstrdup(source->cr_principal, GFP_KERNEL); 1688 if (target->cr_principal == NULL) 1689 return -ENOMEM; 1690 } else 1691 target->cr_principal = NULL; 1692 target->cr_flavor = source->cr_flavor; 1693 target->cr_uid = source->cr_uid; 1694 target->cr_gid = source->cr_gid; 1695 target->cr_group_info = source->cr_group_info; 1696 get_group_info(target->cr_group_info); 1697 target->cr_gss_mech = source->cr_gss_mech; 1698 if (source->cr_gss_mech) 1699 gss_mech_get(source->cr_gss_mech); 1700 return 0; 1701 } 1702 1703 static int 1704 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2) 1705 { 1706 if (o1->len < o2->len) 1707 return -1; 1708 if (o1->len > o2->len) 1709 return 1; 1710 return memcmp(o1->data, o2->data, o1->len); 1711 } 1712 1713 static int same_name(const char *n1, const char *n2) 1714 { 1715 return 0 == memcmp(n1, n2, HEXDIR_LEN); 1716 } 1717 1718 static int 1719 same_verf(nfs4_verifier *v1, nfs4_verifier *v2) 1720 { 1721 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); 1722 } 1723 1724 static int 1725 same_clid(clientid_t *cl1, clientid_t *cl2) 1726 { 1727 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); 1728 } 1729 1730 static bool groups_equal(struct group_info *g1, struct group_info *g2) 1731 { 1732 int i; 1733 1734 if (g1->ngroups != g2->ngroups) 1735 return false; 1736 for (i=0; i<g1->ngroups; i++) 1737 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i))) 1738 return false; 1739 return true; 1740 } 1741 1742 /* 1743 * RFC 3530 language requires clid_inuse be returned when the 1744 * "principal" associated with a requests differs from that previously 1745 * used. We use uid, gid's, and gss principal string as our best 1746 * approximation. We also don't want to allow non-gss use of a client 1747 * established using gss: in theory cr_principal should catch that 1748 * change, but in practice cr_principal can be null even in the gss case 1749 * since gssd doesn't always pass down a principal string. 1750 */ 1751 static bool is_gss_cred(struct svc_cred *cr) 1752 { 1753 /* Is cr_flavor one of the gss "pseudoflavors"?: */ 1754 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR); 1755 } 1756 1757 1758 static bool 1759 same_creds(struct svc_cred *cr1, struct svc_cred *cr2) 1760 { 1761 if ((is_gss_cred(cr1) != is_gss_cred(cr2)) 1762 || (!uid_eq(cr1->cr_uid, cr2->cr_uid)) 1763 || (!gid_eq(cr1->cr_gid, cr2->cr_gid)) 1764 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info)) 1765 return false; 1766 if (cr1->cr_principal == cr2->cr_principal) 1767 return true; 1768 if (!cr1->cr_principal || !cr2->cr_principal) 1769 return false; 1770 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal); 1771 } 1772 1773 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp) 1774 { 1775 struct svc_cred *cr = &rqstp->rq_cred; 1776 u32 service; 1777 1778 if (!cr->cr_gss_mech) 1779 return false; 1780 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor); 1781 return service == RPC_GSS_SVC_INTEGRITY || 1782 service == RPC_GSS_SVC_PRIVACY; 1783 } 1784 1785 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp) 1786 { 1787 struct svc_cred *cr = &rqstp->rq_cred; 1788 1789 if (!cl->cl_mach_cred) 1790 return true; 1791 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech) 1792 return false; 1793 if (!svc_rqst_integrity_protected(rqstp)) 1794 return false; 1795 if (!cr->cr_principal) 1796 return false; 1797 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal); 1798 } 1799 1800 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn) 1801 { 1802 __be32 verf[2]; 1803 1804 /* 1805 * This is opaque to client, so no need to byte-swap. Use 1806 * __force to keep sparse happy 1807 */ 1808 verf[0] = (__force __be32)get_seconds(); 1809 verf[1] = (__force __be32)nn->clientid_counter; 1810 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data)); 1811 } 1812 1813 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn) 1814 { 1815 clp->cl_clientid.cl_boot = nn->boot_time; 1816 clp->cl_clientid.cl_id = nn->clientid_counter++; 1817 gen_confirm(clp, nn); 1818 } 1819 1820 static struct nfs4_stid * 1821 find_stateid_locked(struct nfs4_client *cl, stateid_t *t) 1822 { 1823 struct nfs4_stid *ret; 1824 1825 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id); 1826 if (!ret || !ret->sc_type) 1827 return NULL; 1828 return ret; 1829 } 1830 1831 static struct nfs4_stid * 1832 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask) 1833 { 1834 struct nfs4_stid *s; 1835 1836 spin_lock(&cl->cl_lock); 1837 s = find_stateid_locked(cl, t); 1838 if (s != NULL) { 1839 if (typemask & s->sc_type) 1840 atomic_inc(&s->sc_count); 1841 else 1842 s = NULL; 1843 } 1844 spin_unlock(&cl->cl_lock); 1845 return s; 1846 } 1847 1848 static struct nfs4_client *create_client(struct xdr_netobj name, 1849 struct svc_rqst *rqstp, nfs4_verifier *verf) 1850 { 1851 struct nfs4_client *clp; 1852 struct sockaddr *sa = svc_addr(rqstp); 1853 int ret; 1854 struct net *net = SVC_NET(rqstp); 1855 1856 clp = alloc_client(name); 1857 if (clp == NULL) 1858 return NULL; 1859 1860 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred); 1861 if (ret) { 1862 free_client(clp); 1863 return NULL; 1864 } 1865 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL); 1866 clp->cl_time = get_seconds(); 1867 clear_bit(0, &clp->cl_cb_slot_busy); 1868 copy_verf(clp, verf); 1869 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); 1870 clp->cl_cb_session = NULL; 1871 clp->net = net; 1872 return clp; 1873 } 1874 1875 static void 1876 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root) 1877 { 1878 struct rb_node **new = &(root->rb_node), *parent = NULL; 1879 struct nfs4_client *clp; 1880 1881 while (*new) { 1882 clp = rb_entry(*new, struct nfs4_client, cl_namenode); 1883 parent = *new; 1884 1885 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0) 1886 new = &((*new)->rb_left); 1887 else 1888 new = &((*new)->rb_right); 1889 } 1890 1891 rb_link_node(&new_clp->cl_namenode, parent, new); 1892 rb_insert_color(&new_clp->cl_namenode, root); 1893 } 1894 1895 static struct nfs4_client * 1896 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root) 1897 { 1898 int cmp; 1899 struct rb_node *node = root->rb_node; 1900 struct nfs4_client *clp; 1901 1902 while (node) { 1903 clp = rb_entry(node, struct nfs4_client, cl_namenode); 1904 cmp = compare_blob(&clp->cl_name, name); 1905 if (cmp > 0) 1906 node = node->rb_left; 1907 else if (cmp < 0) 1908 node = node->rb_right; 1909 else 1910 return clp; 1911 } 1912 return NULL; 1913 } 1914 1915 static void 1916 add_to_unconfirmed(struct nfs4_client *clp) 1917 { 1918 unsigned int idhashval; 1919 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1920 1921 lockdep_assert_held(&nn->client_lock); 1922 1923 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); 1924 add_clp_to_name_tree(clp, &nn->unconf_name_tree); 1925 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 1926 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]); 1927 renew_client_locked(clp); 1928 } 1929 1930 static void 1931 move_to_confirmed(struct nfs4_client *clp) 1932 { 1933 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 1934 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1935 1936 lockdep_assert_held(&nn->client_lock); 1937 1938 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 1939 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]); 1940 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); 1941 add_clp_to_name_tree(clp, &nn->conf_name_tree); 1942 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); 1943 renew_client_locked(clp); 1944 } 1945 1946 static struct nfs4_client * 1947 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions) 1948 { 1949 struct nfs4_client *clp; 1950 unsigned int idhashval = clientid_hashval(clid->cl_id); 1951 1952 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) { 1953 if (same_clid(&clp->cl_clientid, clid)) { 1954 if ((bool)clp->cl_minorversion != sessions) 1955 return NULL; 1956 renew_client_locked(clp); 1957 return clp; 1958 } 1959 } 1960 return NULL; 1961 } 1962 1963 static struct nfs4_client * 1964 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) 1965 { 1966 struct list_head *tbl = nn->conf_id_hashtbl; 1967 1968 lockdep_assert_held(&nn->client_lock); 1969 return find_client_in_id_table(tbl, clid, sessions); 1970 } 1971 1972 static struct nfs4_client * 1973 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) 1974 { 1975 struct list_head *tbl = nn->unconf_id_hashtbl; 1976 1977 lockdep_assert_held(&nn->client_lock); 1978 return find_client_in_id_table(tbl, clid, sessions); 1979 } 1980 1981 static bool clp_used_exchangeid(struct nfs4_client *clp) 1982 { 1983 return clp->cl_exchange_flags != 0; 1984 } 1985 1986 static struct nfs4_client * 1987 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) 1988 { 1989 lockdep_assert_held(&nn->client_lock); 1990 return find_clp_in_name_tree(name, &nn->conf_name_tree); 1991 } 1992 1993 static struct nfs4_client * 1994 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) 1995 { 1996 lockdep_assert_held(&nn->client_lock); 1997 return find_clp_in_name_tree(name, &nn->unconf_name_tree); 1998 } 1999 2000 static void 2001 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp) 2002 { 2003 struct nfs4_cb_conn *conn = &clp->cl_cb_conn; 2004 struct sockaddr *sa = svc_addr(rqstp); 2005 u32 scopeid = rpc_get_scope_id(sa); 2006 unsigned short expected_family; 2007 2008 /* Currently, we only support tcp and tcp6 for the callback channel */ 2009 if (se->se_callback_netid_len == 3 && 2010 !memcmp(se->se_callback_netid_val, "tcp", 3)) 2011 expected_family = AF_INET; 2012 else if (se->se_callback_netid_len == 4 && 2013 !memcmp(se->se_callback_netid_val, "tcp6", 4)) 2014 expected_family = AF_INET6; 2015 else 2016 goto out_err; 2017 2018 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val, 2019 se->se_callback_addr_len, 2020 (struct sockaddr *)&conn->cb_addr, 2021 sizeof(conn->cb_addr)); 2022 2023 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) 2024 goto out_err; 2025 2026 if (conn->cb_addr.ss_family == AF_INET6) 2027 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; 2028 2029 conn->cb_prog = se->se_callback_prog; 2030 conn->cb_ident = se->se_callback_ident; 2031 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen); 2032 return; 2033 out_err: 2034 conn->cb_addr.ss_family = AF_UNSPEC; 2035 conn->cb_addrlen = 0; 2036 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 2037 "will not receive delegations\n", 2038 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 2039 2040 return; 2041 } 2042 2043 /* 2044 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size. 2045 */ 2046 static void 2047 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) 2048 { 2049 struct xdr_buf *buf = resp->xdr.buf; 2050 struct nfsd4_slot *slot = resp->cstate.slot; 2051 unsigned int base; 2052 2053 dprintk("--> %s slot %p\n", __func__, slot); 2054 2055 slot->sl_opcnt = resp->opcnt; 2056 slot->sl_status = resp->cstate.status; 2057 2058 slot->sl_flags |= NFSD4_SLOT_INITIALIZED; 2059 if (nfsd4_not_cached(resp)) { 2060 slot->sl_datalen = 0; 2061 return; 2062 } 2063 base = resp->cstate.data_offset; 2064 slot->sl_datalen = buf->len - base; 2065 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen)) 2066 WARN("%s: sessions DRC could not cache compound\n", __func__); 2067 return; 2068 } 2069 2070 /* 2071 * Encode the replay sequence operation from the slot values. 2072 * If cachethis is FALSE encode the uncached rep error on the next 2073 * operation which sets resp->p and increments resp->opcnt for 2074 * nfs4svc_encode_compoundres. 2075 * 2076 */ 2077 static __be32 2078 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, 2079 struct nfsd4_compoundres *resp) 2080 { 2081 struct nfsd4_op *op; 2082 struct nfsd4_slot *slot = resp->cstate.slot; 2083 2084 /* Encode the replayed sequence operation */ 2085 op = &args->ops[resp->opcnt - 1]; 2086 nfsd4_encode_operation(resp, op); 2087 2088 /* Return nfserr_retry_uncached_rep in next operation. */ 2089 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) { 2090 op = &args->ops[resp->opcnt++]; 2091 op->status = nfserr_retry_uncached_rep; 2092 nfsd4_encode_operation(resp, op); 2093 } 2094 return op->status; 2095 } 2096 2097 /* 2098 * The sequence operation is not cached because we can use the slot and 2099 * session values. 2100 */ 2101 static __be32 2102 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, 2103 struct nfsd4_sequence *seq) 2104 { 2105 struct nfsd4_slot *slot = resp->cstate.slot; 2106 struct xdr_stream *xdr = &resp->xdr; 2107 __be32 *p; 2108 __be32 status; 2109 2110 dprintk("--> %s slot %p\n", __func__, slot); 2111 2112 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); 2113 if (status) 2114 return status; 2115 2116 p = xdr_reserve_space(xdr, slot->sl_datalen); 2117 if (!p) { 2118 WARN_ON_ONCE(1); 2119 return nfserr_serverfault; 2120 } 2121 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen); 2122 xdr_commit_encode(xdr); 2123 2124 resp->opcnt = slot->sl_opcnt; 2125 return slot->sl_status; 2126 } 2127 2128 /* 2129 * Set the exchange_id flags returned by the server. 2130 */ 2131 static void 2132 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) 2133 { 2134 #ifdef CONFIG_NFSD_PNFS 2135 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS; 2136 #else 2137 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; 2138 #endif 2139 2140 /* Referrals are supported, Migration is not. */ 2141 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; 2142 2143 /* set the wire flags to return to client. */ 2144 clid->flags = new->cl_exchange_flags; 2145 } 2146 2147 static bool client_has_state(struct nfs4_client *clp) 2148 { 2149 /* 2150 * Note clp->cl_openowners check isn't quite right: there's no 2151 * need to count owners without stateid's. 2152 * 2153 * Also note we should probably be using this in 4.0 case too. 2154 */ 2155 return !list_empty(&clp->cl_openowners) 2156 || !list_empty(&clp->cl_delegations) 2157 || !list_empty(&clp->cl_sessions); 2158 } 2159 2160 __be32 2161 nfsd4_exchange_id(struct svc_rqst *rqstp, 2162 struct nfsd4_compound_state *cstate, 2163 struct nfsd4_exchange_id *exid) 2164 { 2165 struct nfs4_client *conf, *new; 2166 struct nfs4_client *unconf = NULL; 2167 __be32 status; 2168 char addr_str[INET6_ADDRSTRLEN]; 2169 nfs4_verifier verf = exid->verifier; 2170 struct sockaddr *sa = svc_addr(rqstp); 2171 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A; 2172 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2173 2174 rpc_ntop(sa, addr_str, sizeof(addr_str)); 2175 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " 2176 "ip_addr=%s flags %x, spa_how %d\n", 2177 __func__, rqstp, exid, exid->clname.len, exid->clname.data, 2178 addr_str, exid->flags, exid->spa_how); 2179 2180 if (exid->flags & ~EXCHGID4_FLAG_MASK_A) 2181 return nfserr_inval; 2182 2183 switch (exid->spa_how) { 2184 case SP4_MACH_CRED: 2185 if (!svc_rqst_integrity_protected(rqstp)) 2186 return nfserr_inval; 2187 case SP4_NONE: 2188 break; 2189 default: /* checked by xdr code */ 2190 WARN_ON_ONCE(1); 2191 case SP4_SSV: 2192 return nfserr_encr_alg_unsupp; 2193 } 2194 2195 new = create_client(exid->clname, rqstp, &verf); 2196 if (new == NULL) 2197 return nfserr_jukebox; 2198 2199 /* Cases below refer to rfc 5661 section 18.35.4: */ 2200 spin_lock(&nn->client_lock); 2201 conf = find_confirmed_client_by_name(&exid->clname, nn); 2202 if (conf) { 2203 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred); 2204 bool verfs_match = same_verf(&verf, &conf->cl_verifier); 2205 2206 if (update) { 2207 if (!clp_used_exchangeid(conf)) { /* buggy client */ 2208 status = nfserr_inval; 2209 goto out; 2210 } 2211 if (!mach_creds_match(conf, rqstp)) { 2212 status = nfserr_wrong_cred; 2213 goto out; 2214 } 2215 if (!creds_match) { /* case 9 */ 2216 status = nfserr_perm; 2217 goto out; 2218 } 2219 if (!verfs_match) { /* case 8 */ 2220 status = nfserr_not_same; 2221 goto out; 2222 } 2223 /* case 6 */ 2224 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; 2225 goto out_copy; 2226 } 2227 if (!creds_match) { /* case 3 */ 2228 if (client_has_state(conf)) { 2229 status = nfserr_clid_inuse; 2230 goto out; 2231 } 2232 goto out_new; 2233 } 2234 if (verfs_match) { /* case 2 */ 2235 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 2236 goto out_copy; 2237 } 2238 /* case 5, client reboot */ 2239 conf = NULL; 2240 goto out_new; 2241 } 2242 2243 if (update) { /* case 7 */ 2244 status = nfserr_noent; 2245 goto out; 2246 } 2247 2248 unconf = find_unconfirmed_client_by_name(&exid->clname, nn); 2249 if (unconf) /* case 4, possible retry or client restart */ 2250 unhash_client_locked(unconf); 2251 2252 /* case 1 (normal case) */ 2253 out_new: 2254 if (conf) { 2255 status = mark_client_expired_locked(conf); 2256 if (status) 2257 goto out; 2258 } 2259 new->cl_minorversion = cstate->minorversion; 2260 new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED); 2261 2262 gen_clid(new, nn); 2263 add_to_unconfirmed(new); 2264 swap(new, conf); 2265 out_copy: 2266 exid->clientid.cl_boot = conf->cl_clientid.cl_boot; 2267 exid->clientid.cl_id = conf->cl_clientid.cl_id; 2268 2269 exid->seqid = conf->cl_cs_slot.sl_seqid + 1; 2270 nfsd4_set_ex_flags(conf, exid); 2271 2272 dprintk("nfsd4_exchange_id seqid %d flags %x\n", 2273 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags); 2274 status = nfs_ok; 2275 2276 out: 2277 spin_unlock(&nn->client_lock); 2278 if (new) 2279 expire_client(new); 2280 if (unconf) 2281 expire_client(unconf); 2282 return status; 2283 } 2284 2285 static __be32 2286 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) 2287 { 2288 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, 2289 slot_seqid); 2290 2291 /* The slot is in use, and no response has been sent. */ 2292 if (slot_inuse) { 2293 if (seqid == slot_seqid) 2294 return nfserr_jukebox; 2295 else 2296 return nfserr_seq_misordered; 2297 } 2298 /* Note unsigned 32-bit arithmetic handles wraparound: */ 2299 if (likely(seqid == slot_seqid + 1)) 2300 return nfs_ok; 2301 if (seqid == slot_seqid) 2302 return nfserr_replay_cache; 2303 return nfserr_seq_misordered; 2304 } 2305 2306 /* 2307 * Cache the create session result into the create session single DRC 2308 * slot cache by saving the xdr structure. sl_seqid has been set. 2309 * Do this for solo or embedded create session operations. 2310 */ 2311 static void 2312 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, 2313 struct nfsd4_clid_slot *slot, __be32 nfserr) 2314 { 2315 slot->sl_status = nfserr; 2316 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); 2317 } 2318 2319 static __be32 2320 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, 2321 struct nfsd4_clid_slot *slot) 2322 { 2323 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); 2324 return slot->sl_status; 2325 } 2326 2327 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\ 2328 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \ 2329 1 + /* MIN tag is length with zero, only length */ \ 2330 3 + /* version, opcount, opcode */ \ 2331 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ 2332 /* seqid, slotID, slotID, cache */ \ 2333 4 ) * sizeof(__be32)) 2334 2335 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\ 2336 2 + /* verifier: AUTH_NULL, length 0 */\ 2337 1 + /* status */ \ 2338 1 + /* MIN tag is length with zero, only length */ \ 2339 3 + /* opcount, opcode, opstatus*/ \ 2340 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ 2341 /* seqid, slotID, slotID, slotID, status */ \ 2342 5 ) * sizeof(__be32)) 2343 2344 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn) 2345 { 2346 u32 maxrpc = nn->nfsd_serv->sv_max_mesg; 2347 2348 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ) 2349 return nfserr_toosmall; 2350 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ) 2351 return nfserr_toosmall; 2352 ca->headerpadsz = 0; 2353 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc); 2354 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc); 2355 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND); 2356 ca->maxresp_cached = min_t(u32, ca->maxresp_cached, 2357 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ); 2358 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION); 2359 /* 2360 * Note decreasing slot size below client's request may make it 2361 * difficult for client to function correctly, whereas 2362 * decreasing the number of slots will (just?) affect 2363 * performance. When short on memory we therefore prefer to 2364 * decrease number of slots instead of their size. Clients that 2365 * request larger slots than they need will get poor results: 2366 */ 2367 ca->maxreqs = nfsd4_get_drc_mem(ca); 2368 if (!ca->maxreqs) 2369 return nfserr_jukebox; 2370 2371 return nfs_ok; 2372 } 2373 2374 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \ 2375 RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32)) 2376 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \ 2377 RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32)) 2378 2379 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca) 2380 { 2381 ca->headerpadsz = 0; 2382 2383 /* 2384 * These RPC_MAX_HEADER macros are overkill, especially since we 2385 * don't even do gss on the backchannel yet. But this is still 2386 * less than 1k. Tighten up this estimate in the unlikely event 2387 * it turns out to be a problem for some client: 2388 */ 2389 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ) 2390 return nfserr_toosmall; 2391 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ) 2392 return nfserr_toosmall; 2393 ca->maxresp_cached = 0; 2394 if (ca->maxops < 2) 2395 return nfserr_toosmall; 2396 2397 return nfs_ok; 2398 } 2399 2400 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs) 2401 { 2402 switch (cbs->flavor) { 2403 case RPC_AUTH_NULL: 2404 case RPC_AUTH_UNIX: 2405 return nfs_ok; 2406 default: 2407 /* 2408 * GSS case: the spec doesn't allow us to return this 2409 * error. But it also doesn't allow us not to support 2410 * GSS. 2411 * I'd rather this fail hard than return some error the 2412 * client might think it can already handle: 2413 */ 2414 return nfserr_encr_alg_unsupp; 2415 } 2416 } 2417 2418 __be32 2419 nfsd4_create_session(struct svc_rqst *rqstp, 2420 struct nfsd4_compound_state *cstate, 2421 struct nfsd4_create_session *cr_ses) 2422 { 2423 struct sockaddr *sa = svc_addr(rqstp); 2424 struct nfs4_client *conf, *unconf; 2425 struct nfs4_client *old = NULL; 2426 struct nfsd4_session *new; 2427 struct nfsd4_conn *conn; 2428 struct nfsd4_clid_slot *cs_slot = NULL; 2429 __be32 status = 0; 2430 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2431 2432 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A) 2433 return nfserr_inval; 2434 status = nfsd4_check_cb_sec(&cr_ses->cb_sec); 2435 if (status) 2436 return status; 2437 status = check_forechannel_attrs(&cr_ses->fore_channel, nn); 2438 if (status) 2439 return status; 2440 status = check_backchannel_attrs(&cr_ses->back_channel); 2441 if (status) 2442 goto out_release_drc_mem; 2443 status = nfserr_jukebox; 2444 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel); 2445 if (!new) 2446 goto out_release_drc_mem; 2447 conn = alloc_conn_from_crses(rqstp, cr_ses); 2448 if (!conn) 2449 goto out_free_session; 2450 2451 spin_lock(&nn->client_lock); 2452 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn); 2453 conf = find_confirmed_client(&cr_ses->clientid, true, nn); 2454 WARN_ON_ONCE(conf && unconf); 2455 2456 if (conf) { 2457 status = nfserr_wrong_cred; 2458 if (!mach_creds_match(conf, rqstp)) 2459 goto out_free_conn; 2460 cs_slot = &conf->cl_cs_slot; 2461 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 2462 if (status == nfserr_replay_cache) { 2463 status = nfsd4_replay_create_session(cr_ses, cs_slot); 2464 goto out_free_conn; 2465 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) { 2466 status = nfserr_seq_misordered; 2467 goto out_free_conn; 2468 } 2469 } else if (unconf) { 2470 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || 2471 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { 2472 status = nfserr_clid_inuse; 2473 goto out_free_conn; 2474 } 2475 status = nfserr_wrong_cred; 2476 if (!mach_creds_match(unconf, rqstp)) 2477 goto out_free_conn; 2478 cs_slot = &unconf->cl_cs_slot; 2479 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 2480 if (status) { 2481 /* an unconfirmed replay returns misordered */ 2482 status = nfserr_seq_misordered; 2483 goto out_free_conn; 2484 } 2485 old = find_confirmed_client_by_name(&unconf->cl_name, nn); 2486 if (old) { 2487 status = mark_client_expired_locked(old); 2488 if (status) { 2489 old = NULL; 2490 goto out_free_conn; 2491 } 2492 } 2493 move_to_confirmed(unconf); 2494 conf = unconf; 2495 } else { 2496 status = nfserr_stale_clientid; 2497 goto out_free_conn; 2498 } 2499 status = nfs_ok; 2500 /* 2501 * We do not support RDMA or persistent sessions 2502 */ 2503 cr_ses->flags &= ~SESSION4_PERSIST; 2504 cr_ses->flags &= ~SESSION4_RDMA; 2505 2506 init_session(rqstp, new, conf, cr_ses); 2507 nfsd4_get_session_locked(new); 2508 2509 memcpy(cr_ses->sessionid.data, new->se_sessionid.data, 2510 NFS4_MAX_SESSIONID_LEN); 2511 cs_slot->sl_seqid++; 2512 cr_ses->seqid = cs_slot->sl_seqid; 2513 2514 /* cache solo and embedded create sessions under the client_lock */ 2515 nfsd4_cache_create_session(cr_ses, cs_slot, status); 2516 spin_unlock(&nn->client_lock); 2517 /* init connection and backchannel */ 2518 nfsd4_init_conn(rqstp, conn, new); 2519 nfsd4_put_session(new); 2520 if (old) 2521 expire_client(old); 2522 return status; 2523 out_free_conn: 2524 spin_unlock(&nn->client_lock); 2525 free_conn(conn); 2526 if (old) 2527 expire_client(old); 2528 out_free_session: 2529 __free_session(new); 2530 out_release_drc_mem: 2531 nfsd4_put_drc_mem(&cr_ses->fore_channel); 2532 return status; 2533 } 2534 2535 static __be32 nfsd4_map_bcts_dir(u32 *dir) 2536 { 2537 switch (*dir) { 2538 case NFS4_CDFC4_FORE: 2539 case NFS4_CDFC4_BACK: 2540 return nfs_ok; 2541 case NFS4_CDFC4_FORE_OR_BOTH: 2542 case NFS4_CDFC4_BACK_OR_BOTH: 2543 *dir = NFS4_CDFC4_BOTH; 2544 return nfs_ok; 2545 }; 2546 return nfserr_inval; 2547 } 2548 2549 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc) 2550 { 2551 struct nfsd4_session *session = cstate->session; 2552 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2553 __be32 status; 2554 2555 status = nfsd4_check_cb_sec(&bc->bc_cb_sec); 2556 if (status) 2557 return status; 2558 spin_lock(&nn->client_lock); 2559 session->se_cb_prog = bc->bc_cb_program; 2560 session->se_cb_sec = bc->bc_cb_sec; 2561 spin_unlock(&nn->client_lock); 2562 2563 nfsd4_probe_callback(session->se_client); 2564 2565 return nfs_ok; 2566 } 2567 2568 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, 2569 struct nfsd4_compound_state *cstate, 2570 struct nfsd4_bind_conn_to_session *bcts) 2571 { 2572 __be32 status; 2573 struct nfsd4_conn *conn; 2574 struct nfsd4_session *session; 2575 struct net *net = SVC_NET(rqstp); 2576 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2577 2578 if (!nfsd4_last_compound_op(rqstp)) 2579 return nfserr_not_only_op; 2580 spin_lock(&nn->client_lock); 2581 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status); 2582 spin_unlock(&nn->client_lock); 2583 if (!session) 2584 goto out_no_session; 2585 status = nfserr_wrong_cred; 2586 if (!mach_creds_match(session->se_client, rqstp)) 2587 goto out; 2588 status = nfsd4_map_bcts_dir(&bcts->dir); 2589 if (status) 2590 goto out; 2591 conn = alloc_conn(rqstp, bcts->dir); 2592 status = nfserr_jukebox; 2593 if (!conn) 2594 goto out; 2595 nfsd4_init_conn(rqstp, conn, session); 2596 status = nfs_ok; 2597 out: 2598 nfsd4_put_session(session); 2599 out_no_session: 2600 return status; 2601 } 2602 2603 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) 2604 { 2605 if (!session) 2606 return 0; 2607 return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); 2608 } 2609 2610 __be32 2611 nfsd4_destroy_session(struct svc_rqst *r, 2612 struct nfsd4_compound_state *cstate, 2613 struct nfsd4_destroy_session *sessionid) 2614 { 2615 struct nfsd4_session *ses; 2616 __be32 status; 2617 int ref_held_by_me = 0; 2618 struct net *net = SVC_NET(r); 2619 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2620 2621 status = nfserr_not_only_op; 2622 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { 2623 if (!nfsd4_last_compound_op(r)) 2624 goto out; 2625 ref_held_by_me++; 2626 } 2627 dump_sessionid(__func__, &sessionid->sessionid); 2628 spin_lock(&nn->client_lock); 2629 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status); 2630 if (!ses) 2631 goto out_client_lock; 2632 status = nfserr_wrong_cred; 2633 if (!mach_creds_match(ses->se_client, r)) 2634 goto out_put_session; 2635 status = mark_session_dead_locked(ses, 1 + ref_held_by_me); 2636 if (status) 2637 goto out_put_session; 2638 unhash_session(ses); 2639 spin_unlock(&nn->client_lock); 2640 2641 nfsd4_probe_callback_sync(ses->se_client); 2642 2643 spin_lock(&nn->client_lock); 2644 status = nfs_ok; 2645 out_put_session: 2646 nfsd4_put_session_locked(ses); 2647 out_client_lock: 2648 spin_unlock(&nn->client_lock); 2649 out: 2650 return status; 2651 } 2652 2653 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) 2654 { 2655 struct nfsd4_conn *c; 2656 2657 list_for_each_entry(c, &s->se_conns, cn_persession) { 2658 if (c->cn_xprt == xpt) { 2659 return c; 2660 } 2661 } 2662 return NULL; 2663 } 2664 2665 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) 2666 { 2667 struct nfs4_client *clp = ses->se_client; 2668 struct nfsd4_conn *c; 2669 __be32 status = nfs_ok; 2670 int ret; 2671 2672 spin_lock(&clp->cl_lock); 2673 c = __nfsd4_find_conn(new->cn_xprt, ses); 2674 if (c) 2675 goto out_free; 2676 status = nfserr_conn_not_bound_to_session; 2677 if (clp->cl_mach_cred) 2678 goto out_free; 2679 __nfsd4_hash_conn(new, ses); 2680 spin_unlock(&clp->cl_lock); 2681 ret = nfsd4_register_conn(new); 2682 if (ret) 2683 /* oops; xprt is already down: */ 2684 nfsd4_conn_lost(&new->cn_xpt_user); 2685 return nfs_ok; 2686 out_free: 2687 spin_unlock(&clp->cl_lock); 2688 free_conn(new); 2689 return status; 2690 } 2691 2692 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session) 2693 { 2694 struct nfsd4_compoundargs *args = rqstp->rq_argp; 2695 2696 return args->opcnt > session->se_fchannel.maxops; 2697 } 2698 2699 static bool nfsd4_request_too_big(struct svc_rqst *rqstp, 2700 struct nfsd4_session *session) 2701 { 2702 struct xdr_buf *xb = &rqstp->rq_arg; 2703 2704 return xb->len > session->se_fchannel.maxreq_sz; 2705 } 2706 2707 __be32 2708 nfsd4_sequence(struct svc_rqst *rqstp, 2709 struct nfsd4_compound_state *cstate, 2710 struct nfsd4_sequence *seq) 2711 { 2712 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2713 struct xdr_stream *xdr = &resp->xdr; 2714 struct nfsd4_session *session; 2715 struct nfs4_client *clp; 2716 struct nfsd4_slot *slot; 2717 struct nfsd4_conn *conn; 2718 __be32 status; 2719 int buflen; 2720 struct net *net = SVC_NET(rqstp); 2721 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2722 2723 if (resp->opcnt != 1) 2724 return nfserr_sequence_pos; 2725 2726 /* 2727 * Will be either used or freed by nfsd4_sequence_check_conn 2728 * below. 2729 */ 2730 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); 2731 if (!conn) 2732 return nfserr_jukebox; 2733 2734 spin_lock(&nn->client_lock); 2735 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status); 2736 if (!session) 2737 goto out_no_session; 2738 clp = session->se_client; 2739 2740 status = nfserr_too_many_ops; 2741 if (nfsd4_session_too_many_ops(rqstp, session)) 2742 goto out_put_session; 2743 2744 status = nfserr_req_too_big; 2745 if (nfsd4_request_too_big(rqstp, session)) 2746 goto out_put_session; 2747 2748 status = nfserr_badslot; 2749 if (seq->slotid >= session->se_fchannel.maxreqs) 2750 goto out_put_session; 2751 2752 slot = session->se_slots[seq->slotid]; 2753 dprintk("%s: slotid %d\n", __func__, seq->slotid); 2754 2755 /* We do not negotiate the number of slots yet, so set the 2756 * maxslots to the session maxreqs which is used to encode 2757 * sr_highest_slotid and the sr_target_slot id to maxslots */ 2758 seq->maxslots = session->se_fchannel.maxreqs; 2759 2760 status = check_slot_seqid(seq->seqid, slot->sl_seqid, 2761 slot->sl_flags & NFSD4_SLOT_INUSE); 2762 if (status == nfserr_replay_cache) { 2763 status = nfserr_seq_misordered; 2764 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED)) 2765 goto out_put_session; 2766 cstate->slot = slot; 2767 cstate->session = session; 2768 cstate->clp = clp; 2769 /* Return the cached reply status and set cstate->status 2770 * for nfsd4_proc_compound processing */ 2771 status = nfsd4_replay_cache_entry(resp, seq); 2772 cstate->status = nfserr_replay_cache; 2773 goto out; 2774 } 2775 if (status) 2776 goto out_put_session; 2777 2778 status = nfsd4_sequence_check_conn(conn, session); 2779 conn = NULL; 2780 if (status) 2781 goto out_put_session; 2782 2783 buflen = (seq->cachethis) ? 2784 session->se_fchannel.maxresp_cached : 2785 session->se_fchannel.maxresp_sz; 2786 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache : 2787 nfserr_rep_too_big; 2788 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack)) 2789 goto out_put_session; 2790 svc_reserve(rqstp, buflen); 2791 2792 status = nfs_ok; 2793 /* Success! bump slot seqid */ 2794 slot->sl_seqid = seq->seqid; 2795 slot->sl_flags |= NFSD4_SLOT_INUSE; 2796 if (seq->cachethis) 2797 slot->sl_flags |= NFSD4_SLOT_CACHETHIS; 2798 else 2799 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS; 2800 2801 cstate->slot = slot; 2802 cstate->session = session; 2803 cstate->clp = clp; 2804 2805 out: 2806 switch (clp->cl_cb_state) { 2807 case NFSD4_CB_DOWN: 2808 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN; 2809 break; 2810 case NFSD4_CB_FAULT: 2811 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT; 2812 break; 2813 default: 2814 seq->status_flags = 0; 2815 } 2816 if (!list_empty(&clp->cl_revoked)) 2817 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED; 2818 out_no_session: 2819 if (conn) 2820 free_conn(conn); 2821 spin_unlock(&nn->client_lock); 2822 return status; 2823 out_put_session: 2824 nfsd4_put_session_locked(session); 2825 goto out_no_session; 2826 } 2827 2828 void 2829 nfsd4_sequence_done(struct nfsd4_compoundres *resp) 2830 { 2831 struct nfsd4_compound_state *cs = &resp->cstate; 2832 2833 if (nfsd4_has_session(cs)) { 2834 if (cs->status != nfserr_replay_cache) { 2835 nfsd4_store_cache_entry(resp); 2836 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE; 2837 } 2838 /* Drop session reference that was taken in nfsd4_sequence() */ 2839 nfsd4_put_session(cs->session); 2840 } else if (cs->clp) 2841 put_client_renew(cs->clp); 2842 } 2843 2844 __be32 2845 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc) 2846 { 2847 struct nfs4_client *conf, *unconf; 2848 struct nfs4_client *clp = NULL; 2849 __be32 status = 0; 2850 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2851 2852 spin_lock(&nn->client_lock); 2853 unconf = find_unconfirmed_client(&dc->clientid, true, nn); 2854 conf = find_confirmed_client(&dc->clientid, true, nn); 2855 WARN_ON_ONCE(conf && unconf); 2856 2857 if (conf) { 2858 if (client_has_state(conf)) { 2859 status = nfserr_clientid_busy; 2860 goto out; 2861 } 2862 status = mark_client_expired_locked(conf); 2863 if (status) 2864 goto out; 2865 clp = conf; 2866 } else if (unconf) 2867 clp = unconf; 2868 else { 2869 status = nfserr_stale_clientid; 2870 goto out; 2871 } 2872 if (!mach_creds_match(clp, rqstp)) { 2873 clp = NULL; 2874 status = nfserr_wrong_cred; 2875 goto out; 2876 } 2877 unhash_client_locked(clp); 2878 out: 2879 spin_unlock(&nn->client_lock); 2880 if (clp) 2881 expire_client(clp); 2882 return status; 2883 } 2884 2885 __be32 2886 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc) 2887 { 2888 __be32 status = 0; 2889 2890 if (rc->rca_one_fs) { 2891 if (!cstate->current_fh.fh_dentry) 2892 return nfserr_nofilehandle; 2893 /* 2894 * We don't take advantage of the rca_one_fs case. 2895 * That's OK, it's optional, we can safely ignore it. 2896 */ 2897 return nfs_ok; 2898 } 2899 2900 status = nfserr_complete_already; 2901 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, 2902 &cstate->session->se_client->cl_flags)) 2903 goto out; 2904 2905 status = nfserr_stale_clientid; 2906 if (is_client_expired(cstate->session->se_client)) 2907 /* 2908 * The following error isn't really legal. 2909 * But we only get here if the client just explicitly 2910 * destroyed the client. Surely it no longer cares what 2911 * error it gets back on an operation for the dead 2912 * client. 2913 */ 2914 goto out; 2915 2916 status = nfs_ok; 2917 nfsd4_client_record_create(cstate->session->se_client); 2918 out: 2919 return status; 2920 } 2921 2922 __be32 2923 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2924 struct nfsd4_setclientid *setclid) 2925 { 2926 struct xdr_netobj clname = setclid->se_name; 2927 nfs4_verifier clverifier = setclid->se_verf; 2928 struct nfs4_client *conf, *new; 2929 struct nfs4_client *unconf = NULL; 2930 __be32 status; 2931 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2932 2933 new = create_client(clname, rqstp, &clverifier); 2934 if (new == NULL) 2935 return nfserr_jukebox; 2936 /* Cases below refer to rfc 3530 section 14.2.33: */ 2937 spin_lock(&nn->client_lock); 2938 conf = find_confirmed_client_by_name(&clname, nn); 2939 if (conf) { 2940 /* case 0: */ 2941 status = nfserr_clid_inuse; 2942 if (clp_used_exchangeid(conf)) 2943 goto out; 2944 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 2945 char addr_str[INET6_ADDRSTRLEN]; 2946 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, 2947 sizeof(addr_str)); 2948 dprintk("NFSD: setclientid: string in use by client " 2949 "at %s\n", addr_str); 2950 goto out; 2951 } 2952 } 2953 unconf = find_unconfirmed_client_by_name(&clname, nn); 2954 if (unconf) 2955 unhash_client_locked(unconf); 2956 if (conf && same_verf(&conf->cl_verifier, &clverifier)) 2957 /* case 1: probable callback update */ 2958 copy_clid(new, conf); 2959 else /* case 4 (new client) or cases 2, 3 (client reboot): */ 2960 gen_clid(new, nn); 2961 new->cl_minorversion = 0; 2962 gen_callback(new, setclid, rqstp); 2963 add_to_unconfirmed(new); 2964 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 2965 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 2966 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 2967 new = NULL; 2968 status = nfs_ok; 2969 out: 2970 spin_unlock(&nn->client_lock); 2971 if (new) 2972 free_client(new); 2973 if (unconf) 2974 expire_client(unconf); 2975 return status; 2976 } 2977 2978 2979 __be32 2980 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 2981 struct nfsd4_compound_state *cstate, 2982 struct nfsd4_setclientid_confirm *setclientid_confirm) 2983 { 2984 struct nfs4_client *conf, *unconf; 2985 struct nfs4_client *old = NULL; 2986 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 2987 clientid_t * clid = &setclientid_confirm->sc_clientid; 2988 __be32 status; 2989 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2990 2991 if (STALE_CLIENTID(clid, nn)) 2992 return nfserr_stale_clientid; 2993 2994 spin_lock(&nn->client_lock); 2995 conf = find_confirmed_client(clid, false, nn); 2996 unconf = find_unconfirmed_client(clid, false, nn); 2997 /* 2998 * We try hard to give out unique clientid's, so if we get an 2999 * attempt to confirm the same clientid with a different cred, 3000 * there's a bug somewhere. Let's charitably assume it's our 3001 * bug. 3002 */ 3003 status = nfserr_serverfault; 3004 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) 3005 goto out; 3006 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) 3007 goto out; 3008 /* cases below refer to rfc 3530 section 14.2.34: */ 3009 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) { 3010 if (conf && !unconf) /* case 2: probable retransmit */ 3011 status = nfs_ok; 3012 else /* case 4: client hasn't noticed we rebooted yet? */ 3013 status = nfserr_stale_clientid; 3014 goto out; 3015 } 3016 status = nfs_ok; 3017 if (conf) { /* case 1: callback update */ 3018 old = unconf; 3019 unhash_client_locked(old); 3020 nfsd4_change_callback(conf, &unconf->cl_cb_conn); 3021 } else { /* case 3: normal case; new or rebooted client */ 3022 old = find_confirmed_client_by_name(&unconf->cl_name, nn); 3023 if (old) { 3024 status = mark_client_expired_locked(old); 3025 if (status) { 3026 old = NULL; 3027 goto out; 3028 } 3029 } 3030 move_to_confirmed(unconf); 3031 conf = unconf; 3032 } 3033 get_client_locked(conf); 3034 spin_unlock(&nn->client_lock); 3035 nfsd4_probe_callback(conf); 3036 spin_lock(&nn->client_lock); 3037 put_client_renew_locked(conf); 3038 out: 3039 spin_unlock(&nn->client_lock); 3040 if (old) 3041 expire_client(old); 3042 return status; 3043 } 3044 3045 static struct nfs4_file *nfsd4_alloc_file(void) 3046 { 3047 return kmem_cache_alloc(file_slab, GFP_KERNEL); 3048 } 3049 3050 /* OPEN Share state helper functions */ 3051 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval, 3052 struct nfs4_file *fp) 3053 { 3054 lockdep_assert_held(&state_lock); 3055 3056 atomic_set(&fp->fi_ref, 1); 3057 spin_lock_init(&fp->fi_lock); 3058 INIT_LIST_HEAD(&fp->fi_stateids); 3059 INIT_LIST_HEAD(&fp->fi_delegations); 3060 fh_copy_shallow(&fp->fi_fhandle, fh); 3061 fp->fi_deleg_file = NULL; 3062 fp->fi_had_conflict = false; 3063 fp->fi_share_deny = 0; 3064 memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); 3065 memset(fp->fi_access, 0, sizeof(fp->fi_access)); 3066 #ifdef CONFIG_NFSD_PNFS 3067 INIT_LIST_HEAD(&fp->fi_lo_states); 3068 atomic_set(&fp->fi_lo_recalls, 0); 3069 #endif 3070 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]); 3071 } 3072 3073 void 3074 nfsd4_free_slabs(void) 3075 { 3076 kmem_cache_destroy(openowner_slab); 3077 kmem_cache_destroy(lockowner_slab); 3078 kmem_cache_destroy(file_slab); 3079 kmem_cache_destroy(stateid_slab); 3080 kmem_cache_destroy(deleg_slab); 3081 } 3082 3083 int 3084 nfsd4_init_slabs(void) 3085 { 3086 openowner_slab = kmem_cache_create("nfsd4_openowners", 3087 sizeof(struct nfs4_openowner), 0, 0, NULL); 3088 if (openowner_slab == NULL) 3089 goto out; 3090 lockowner_slab = kmem_cache_create("nfsd4_lockowners", 3091 sizeof(struct nfs4_lockowner), 0, 0, NULL); 3092 if (lockowner_slab == NULL) 3093 goto out_free_openowner_slab; 3094 file_slab = kmem_cache_create("nfsd4_files", 3095 sizeof(struct nfs4_file), 0, 0, NULL); 3096 if (file_slab == NULL) 3097 goto out_free_lockowner_slab; 3098 stateid_slab = kmem_cache_create("nfsd4_stateids", 3099 sizeof(struct nfs4_ol_stateid), 0, 0, NULL); 3100 if (stateid_slab == NULL) 3101 goto out_free_file_slab; 3102 deleg_slab = kmem_cache_create("nfsd4_delegations", 3103 sizeof(struct nfs4_delegation), 0, 0, NULL); 3104 if (deleg_slab == NULL) 3105 goto out_free_stateid_slab; 3106 return 0; 3107 3108 out_free_stateid_slab: 3109 kmem_cache_destroy(stateid_slab); 3110 out_free_file_slab: 3111 kmem_cache_destroy(file_slab); 3112 out_free_lockowner_slab: 3113 kmem_cache_destroy(lockowner_slab); 3114 out_free_openowner_slab: 3115 kmem_cache_destroy(openowner_slab); 3116 out: 3117 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 3118 return -ENOMEM; 3119 } 3120 3121 static void init_nfs4_replay(struct nfs4_replay *rp) 3122 { 3123 rp->rp_status = nfserr_serverfault; 3124 rp->rp_buflen = 0; 3125 rp->rp_buf = rp->rp_ibuf; 3126 mutex_init(&rp->rp_mutex); 3127 } 3128 3129 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate, 3130 struct nfs4_stateowner *so) 3131 { 3132 if (!nfsd4_has_session(cstate)) { 3133 mutex_lock(&so->so_replay.rp_mutex); 3134 cstate->replay_owner = nfs4_get_stateowner(so); 3135 } 3136 } 3137 3138 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate) 3139 { 3140 struct nfs4_stateowner *so = cstate->replay_owner; 3141 3142 if (so != NULL) { 3143 cstate->replay_owner = NULL; 3144 mutex_unlock(&so->so_replay.rp_mutex); 3145 nfs4_put_stateowner(so); 3146 } 3147 } 3148 3149 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp) 3150 { 3151 struct nfs4_stateowner *sop; 3152 3153 sop = kmem_cache_alloc(slab, GFP_KERNEL); 3154 if (!sop) 3155 return NULL; 3156 3157 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL); 3158 if (!sop->so_owner.data) { 3159 kmem_cache_free(slab, sop); 3160 return NULL; 3161 } 3162 sop->so_owner.len = owner->len; 3163 3164 INIT_LIST_HEAD(&sop->so_stateids); 3165 sop->so_client = clp; 3166 init_nfs4_replay(&sop->so_replay); 3167 atomic_set(&sop->so_count, 1); 3168 return sop; 3169 } 3170 3171 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval) 3172 { 3173 lockdep_assert_held(&clp->cl_lock); 3174 3175 list_add(&oo->oo_owner.so_strhash, 3176 &clp->cl_ownerstr_hashtbl[strhashval]); 3177 list_add(&oo->oo_perclient, &clp->cl_openowners); 3178 } 3179 3180 static void nfs4_unhash_openowner(struct nfs4_stateowner *so) 3181 { 3182 unhash_openowner_locked(openowner(so)); 3183 } 3184 3185 static void nfs4_free_openowner(struct nfs4_stateowner *so) 3186 { 3187 struct nfs4_openowner *oo = openowner(so); 3188 3189 kmem_cache_free(openowner_slab, oo); 3190 } 3191 3192 static const struct nfs4_stateowner_operations openowner_ops = { 3193 .so_unhash = nfs4_unhash_openowner, 3194 .so_free = nfs4_free_openowner, 3195 }; 3196 3197 static struct nfs4_openowner * 3198 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open, 3199 struct nfsd4_compound_state *cstate) 3200 { 3201 struct nfs4_client *clp = cstate->clp; 3202 struct nfs4_openowner *oo, *ret; 3203 3204 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp); 3205 if (!oo) 3206 return NULL; 3207 oo->oo_owner.so_ops = &openowner_ops; 3208 oo->oo_owner.so_is_open_owner = 1; 3209 oo->oo_owner.so_seqid = open->op_seqid; 3210 oo->oo_flags = 0; 3211 if (nfsd4_has_session(cstate)) 3212 oo->oo_flags |= NFS4_OO_CONFIRMED; 3213 oo->oo_time = 0; 3214 oo->oo_last_closed_stid = NULL; 3215 INIT_LIST_HEAD(&oo->oo_close_lru); 3216 spin_lock(&clp->cl_lock); 3217 ret = find_openstateowner_str_locked(strhashval, open, clp); 3218 if (ret == NULL) { 3219 hash_openowner(oo, clp, strhashval); 3220 ret = oo; 3221 } else 3222 nfs4_free_openowner(&oo->oo_owner); 3223 spin_unlock(&clp->cl_lock); 3224 return ret; 3225 } 3226 3227 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 3228 struct nfs4_openowner *oo = open->op_openowner; 3229 3230 atomic_inc(&stp->st_stid.sc_count); 3231 stp->st_stid.sc_type = NFS4_OPEN_STID; 3232 INIT_LIST_HEAD(&stp->st_locks); 3233 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner); 3234 get_nfs4_file(fp); 3235 stp->st_stid.sc_file = fp; 3236 stp->st_access_bmap = 0; 3237 stp->st_deny_bmap = 0; 3238 stp->st_openstp = NULL; 3239 spin_lock(&oo->oo_owner.so_client->cl_lock); 3240 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids); 3241 spin_lock(&fp->fi_lock); 3242 list_add(&stp->st_perfile, &fp->fi_stateids); 3243 spin_unlock(&fp->fi_lock); 3244 spin_unlock(&oo->oo_owner.so_client->cl_lock); 3245 } 3246 3247 /* 3248 * In the 4.0 case we need to keep the owners around a little while to handle 3249 * CLOSE replay. We still do need to release any file access that is held by 3250 * them before returning however. 3251 */ 3252 static void 3253 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net) 3254 { 3255 struct nfs4_ol_stateid *last; 3256 struct nfs4_openowner *oo = openowner(s->st_stateowner); 3257 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net, 3258 nfsd_net_id); 3259 3260 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo); 3261 3262 /* 3263 * We know that we hold one reference via nfsd4_close, and another 3264 * "persistent" reference for the client. If the refcount is higher 3265 * than 2, then there are still calls in progress that are using this 3266 * stateid. We can't put the sc_file reference until they are finished. 3267 * Wait for the refcount to drop to 2. Since it has been unhashed, 3268 * there should be no danger of the refcount going back up again at 3269 * this point. 3270 */ 3271 wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2); 3272 3273 release_all_access(s); 3274 if (s->st_stid.sc_file) { 3275 put_nfs4_file(s->st_stid.sc_file); 3276 s->st_stid.sc_file = NULL; 3277 } 3278 3279 spin_lock(&nn->client_lock); 3280 last = oo->oo_last_closed_stid; 3281 oo->oo_last_closed_stid = s; 3282 list_move_tail(&oo->oo_close_lru, &nn->close_lru); 3283 oo->oo_time = get_seconds(); 3284 spin_unlock(&nn->client_lock); 3285 if (last) 3286 nfs4_put_stid(&last->st_stid); 3287 } 3288 3289 /* search file_hashtbl[] for file */ 3290 static struct nfs4_file * 3291 find_file_locked(struct knfsd_fh *fh, unsigned int hashval) 3292 { 3293 struct nfs4_file *fp; 3294 3295 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) { 3296 if (fh_match(&fp->fi_fhandle, fh)) { 3297 if (atomic_inc_not_zero(&fp->fi_ref)) 3298 return fp; 3299 } 3300 } 3301 return NULL; 3302 } 3303 3304 struct nfs4_file * 3305 find_file(struct knfsd_fh *fh) 3306 { 3307 struct nfs4_file *fp; 3308 unsigned int hashval = file_hashval(fh); 3309 3310 rcu_read_lock(); 3311 fp = find_file_locked(fh, hashval); 3312 rcu_read_unlock(); 3313 return fp; 3314 } 3315 3316 static struct nfs4_file * 3317 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh) 3318 { 3319 struct nfs4_file *fp; 3320 unsigned int hashval = file_hashval(fh); 3321 3322 rcu_read_lock(); 3323 fp = find_file_locked(fh, hashval); 3324 rcu_read_unlock(); 3325 if (fp) 3326 return fp; 3327 3328 spin_lock(&state_lock); 3329 fp = find_file_locked(fh, hashval); 3330 if (likely(fp == NULL)) { 3331 nfsd4_init_file(fh, hashval, new); 3332 fp = new; 3333 } 3334 spin_unlock(&state_lock); 3335 3336 return fp; 3337 } 3338 3339 /* 3340 * Called to check deny when READ with all zero stateid or 3341 * WRITE with all zero or all one stateid 3342 */ 3343 static __be32 3344 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 3345 { 3346 struct nfs4_file *fp; 3347 __be32 ret = nfs_ok; 3348 3349 fp = find_file(¤t_fh->fh_handle); 3350 if (!fp) 3351 return ret; 3352 /* Check for conflicting share reservations */ 3353 spin_lock(&fp->fi_lock); 3354 if (fp->fi_share_deny & deny_type) 3355 ret = nfserr_locked; 3356 spin_unlock(&fp->fi_lock); 3357 put_nfs4_file(fp); 3358 return ret; 3359 } 3360 3361 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb) 3362 { 3363 struct nfs4_delegation *dp = cb_to_delegation(cb); 3364 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net, 3365 nfsd_net_id); 3366 3367 block_delegations(&dp->dl_stid.sc_file->fi_fhandle); 3368 3369 /* 3370 * We can't do this in nfsd_break_deleg_cb because it is 3371 * already holding inode->i_lock. 3372 * 3373 * If the dl_time != 0, then we know that it has already been 3374 * queued for a lease break. Don't queue it again. 3375 */ 3376 spin_lock(&state_lock); 3377 if (dp->dl_time == 0) { 3378 dp->dl_time = get_seconds(); 3379 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru); 3380 } 3381 spin_unlock(&state_lock); 3382 } 3383 3384 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb, 3385 struct rpc_task *task) 3386 { 3387 struct nfs4_delegation *dp = cb_to_delegation(cb); 3388 3389 switch (task->tk_status) { 3390 case 0: 3391 return 1; 3392 case -EBADHANDLE: 3393 case -NFS4ERR_BAD_STATEID: 3394 /* 3395 * Race: client probably got cb_recall before open reply 3396 * granting delegation. 3397 */ 3398 if (dp->dl_retries--) { 3399 rpc_delay(task, 2 * HZ); 3400 return 0; 3401 } 3402 /*FALLTHRU*/ 3403 default: 3404 return -1; 3405 } 3406 } 3407 3408 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb) 3409 { 3410 struct nfs4_delegation *dp = cb_to_delegation(cb); 3411 3412 nfs4_put_stid(&dp->dl_stid); 3413 } 3414 3415 static struct nfsd4_callback_ops nfsd4_cb_recall_ops = { 3416 .prepare = nfsd4_cb_recall_prepare, 3417 .done = nfsd4_cb_recall_done, 3418 .release = nfsd4_cb_recall_release, 3419 }; 3420 3421 static void nfsd_break_one_deleg(struct nfs4_delegation *dp) 3422 { 3423 /* 3424 * We're assuming the state code never drops its reference 3425 * without first removing the lease. Since we're in this lease 3426 * callback (and since the lease code is serialized by the kernel 3427 * lock) we know the server hasn't removed the lease yet, we know 3428 * it's safe to take a reference. 3429 */ 3430 atomic_inc(&dp->dl_stid.sc_count); 3431 nfsd4_run_cb(&dp->dl_recall); 3432 } 3433 3434 /* Called from break_lease() with i_lock held. */ 3435 static bool 3436 nfsd_break_deleg_cb(struct file_lock *fl) 3437 { 3438 bool ret = false; 3439 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner; 3440 struct nfs4_delegation *dp; 3441 3442 if (!fp) { 3443 WARN(1, "(%p)->fl_owner NULL\n", fl); 3444 return ret; 3445 } 3446 if (fp->fi_had_conflict) { 3447 WARN(1, "duplicate break on %p\n", fp); 3448 return ret; 3449 } 3450 /* 3451 * We don't want the locks code to timeout the lease for us; 3452 * we'll remove it ourself if a delegation isn't returned 3453 * in time: 3454 */ 3455 fl->fl_break_time = 0; 3456 3457 spin_lock(&fp->fi_lock); 3458 fp->fi_had_conflict = true; 3459 /* 3460 * If there are no delegations on the list, then return true 3461 * so that the lease code will go ahead and delete it. 3462 */ 3463 if (list_empty(&fp->fi_delegations)) 3464 ret = true; 3465 else 3466 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) 3467 nfsd_break_one_deleg(dp); 3468 spin_unlock(&fp->fi_lock); 3469 return ret; 3470 } 3471 3472 static int 3473 nfsd_change_deleg_cb(struct file_lock *onlist, int arg, 3474 struct list_head *dispose) 3475 { 3476 if (arg & F_UNLCK) 3477 return lease_modify(onlist, arg, dispose); 3478 else 3479 return -EAGAIN; 3480 } 3481 3482 static const struct lock_manager_operations nfsd_lease_mng_ops = { 3483 .lm_break = nfsd_break_deleg_cb, 3484 .lm_change = nfsd_change_deleg_cb, 3485 }; 3486 3487 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid) 3488 { 3489 if (nfsd4_has_session(cstate)) 3490 return nfs_ok; 3491 if (seqid == so->so_seqid - 1) 3492 return nfserr_replay_me; 3493 if (seqid == so->so_seqid) 3494 return nfs_ok; 3495 return nfserr_bad_seqid; 3496 } 3497 3498 static __be32 lookup_clientid(clientid_t *clid, 3499 struct nfsd4_compound_state *cstate, 3500 struct nfsd_net *nn) 3501 { 3502 struct nfs4_client *found; 3503 3504 if (cstate->clp) { 3505 found = cstate->clp; 3506 if (!same_clid(&found->cl_clientid, clid)) 3507 return nfserr_stale_clientid; 3508 return nfs_ok; 3509 } 3510 3511 if (STALE_CLIENTID(clid, nn)) 3512 return nfserr_stale_clientid; 3513 3514 /* 3515 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one 3516 * cached already then we know this is for is for v4.0 and "sessions" 3517 * will be false. 3518 */ 3519 WARN_ON_ONCE(cstate->session); 3520 spin_lock(&nn->client_lock); 3521 found = find_confirmed_client(clid, false, nn); 3522 if (!found) { 3523 spin_unlock(&nn->client_lock); 3524 return nfserr_expired; 3525 } 3526 atomic_inc(&found->cl_refcount); 3527 spin_unlock(&nn->client_lock); 3528 3529 /* Cache the nfs4_client in cstate! */ 3530 cstate->clp = found; 3531 return nfs_ok; 3532 } 3533 3534 __be32 3535 nfsd4_process_open1(struct nfsd4_compound_state *cstate, 3536 struct nfsd4_open *open, struct nfsd_net *nn) 3537 { 3538 clientid_t *clientid = &open->op_clientid; 3539 struct nfs4_client *clp = NULL; 3540 unsigned int strhashval; 3541 struct nfs4_openowner *oo = NULL; 3542 __be32 status; 3543 3544 if (STALE_CLIENTID(&open->op_clientid, nn)) 3545 return nfserr_stale_clientid; 3546 /* 3547 * In case we need it later, after we've already created the 3548 * file and don't want to risk a further failure: 3549 */ 3550 open->op_file = nfsd4_alloc_file(); 3551 if (open->op_file == NULL) 3552 return nfserr_jukebox; 3553 3554 status = lookup_clientid(clientid, cstate, nn); 3555 if (status) 3556 return status; 3557 clp = cstate->clp; 3558 3559 strhashval = ownerstr_hashval(&open->op_owner); 3560 oo = find_openstateowner_str(strhashval, open, clp); 3561 open->op_openowner = oo; 3562 if (!oo) { 3563 goto new_owner; 3564 } 3565 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { 3566 /* Replace unconfirmed owners without checking for replay. */ 3567 release_openowner(oo); 3568 open->op_openowner = NULL; 3569 goto new_owner; 3570 } 3571 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid); 3572 if (status) 3573 return status; 3574 goto alloc_stateid; 3575 new_owner: 3576 oo = alloc_init_open_stateowner(strhashval, open, cstate); 3577 if (oo == NULL) 3578 return nfserr_jukebox; 3579 open->op_openowner = oo; 3580 alloc_stateid: 3581 open->op_stp = nfs4_alloc_open_stateid(clp); 3582 if (!open->op_stp) 3583 return nfserr_jukebox; 3584 return nfs_ok; 3585 } 3586 3587 static inline __be32 3588 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 3589 { 3590 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 3591 return nfserr_openmode; 3592 else 3593 return nfs_ok; 3594 } 3595 3596 static int share_access_to_flags(u32 share_access) 3597 { 3598 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; 3599 } 3600 3601 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s) 3602 { 3603 struct nfs4_stid *ret; 3604 3605 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID); 3606 if (!ret) 3607 return NULL; 3608 return delegstateid(ret); 3609 } 3610 3611 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open) 3612 { 3613 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR || 3614 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH; 3615 } 3616 3617 static __be32 3618 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open, 3619 struct nfs4_delegation **dp) 3620 { 3621 int flags; 3622 __be32 status = nfserr_bad_stateid; 3623 struct nfs4_delegation *deleg; 3624 3625 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid); 3626 if (deleg == NULL) 3627 goto out; 3628 flags = share_access_to_flags(open->op_share_access); 3629 status = nfs4_check_delegmode(deleg, flags); 3630 if (status) { 3631 nfs4_put_stid(&deleg->dl_stid); 3632 goto out; 3633 } 3634 *dp = deleg; 3635 out: 3636 if (!nfsd4_is_deleg_cur(open)) 3637 return nfs_ok; 3638 if (status) 3639 return status; 3640 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; 3641 return nfs_ok; 3642 } 3643 3644 static struct nfs4_ol_stateid * 3645 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open) 3646 { 3647 struct nfs4_ol_stateid *local, *ret = NULL; 3648 struct nfs4_openowner *oo = open->op_openowner; 3649 3650 spin_lock(&fp->fi_lock); 3651 list_for_each_entry(local, &fp->fi_stateids, st_perfile) { 3652 /* ignore lock owners */ 3653 if (local->st_stateowner->so_is_open_owner == 0) 3654 continue; 3655 if (local->st_stateowner == &oo->oo_owner) { 3656 ret = local; 3657 atomic_inc(&ret->st_stid.sc_count); 3658 break; 3659 } 3660 } 3661 spin_unlock(&fp->fi_lock); 3662 return ret; 3663 } 3664 3665 static inline int nfs4_access_to_access(u32 nfs4_access) 3666 { 3667 int flags = 0; 3668 3669 if (nfs4_access & NFS4_SHARE_ACCESS_READ) 3670 flags |= NFSD_MAY_READ; 3671 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) 3672 flags |= NFSD_MAY_WRITE; 3673 return flags; 3674 } 3675 3676 static inline __be32 3677 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 3678 struct nfsd4_open *open) 3679 { 3680 struct iattr iattr = { 3681 .ia_valid = ATTR_SIZE, 3682 .ia_size = 0, 3683 }; 3684 if (!open->op_truncate) 3685 return 0; 3686 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 3687 return nfserr_inval; 3688 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 3689 } 3690 3691 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, 3692 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, 3693 struct nfsd4_open *open) 3694 { 3695 struct file *filp = NULL; 3696 __be32 status; 3697 int oflag = nfs4_access_to_omode(open->op_share_access); 3698 int access = nfs4_access_to_access(open->op_share_access); 3699 unsigned char old_access_bmap, old_deny_bmap; 3700 3701 spin_lock(&fp->fi_lock); 3702 3703 /* 3704 * Are we trying to set a deny mode that would conflict with 3705 * current access? 3706 */ 3707 status = nfs4_file_check_deny(fp, open->op_share_deny); 3708 if (status != nfs_ok) { 3709 spin_unlock(&fp->fi_lock); 3710 goto out; 3711 } 3712 3713 /* set access to the file */ 3714 status = nfs4_file_get_access(fp, open->op_share_access); 3715 if (status != nfs_ok) { 3716 spin_unlock(&fp->fi_lock); 3717 goto out; 3718 } 3719 3720 /* Set access bits in stateid */ 3721 old_access_bmap = stp->st_access_bmap; 3722 set_access(open->op_share_access, stp); 3723 3724 /* Set new deny mask */ 3725 old_deny_bmap = stp->st_deny_bmap; 3726 set_deny(open->op_share_deny, stp); 3727 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH); 3728 3729 if (!fp->fi_fds[oflag]) { 3730 spin_unlock(&fp->fi_lock); 3731 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp); 3732 if (status) 3733 goto out_put_access; 3734 spin_lock(&fp->fi_lock); 3735 if (!fp->fi_fds[oflag]) { 3736 fp->fi_fds[oflag] = filp; 3737 filp = NULL; 3738 } 3739 } 3740 spin_unlock(&fp->fi_lock); 3741 if (filp) 3742 fput(filp); 3743 3744 status = nfsd4_truncate(rqstp, cur_fh, open); 3745 if (status) 3746 goto out_put_access; 3747 out: 3748 return status; 3749 out_put_access: 3750 stp->st_access_bmap = old_access_bmap; 3751 nfs4_file_put_access(fp, open->op_share_access); 3752 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp); 3753 goto out; 3754 } 3755 3756 static __be32 3757 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open) 3758 { 3759 __be32 status; 3760 unsigned char old_deny_bmap; 3761 3762 if (!test_access(open->op_share_access, stp)) 3763 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open); 3764 3765 /* test and set deny mode */ 3766 spin_lock(&fp->fi_lock); 3767 status = nfs4_file_check_deny(fp, open->op_share_deny); 3768 if (status == nfs_ok) { 3769 old_deny_bmap = stp->st_deny_bmap; 3770 set_deny(open->op_share_deny, stp); 3771 fp->fi_share_deny |= 3772 (open->op_share_deny & NFS4_SHARE_DENY_BOTH); 3773 } 3774 spin_unlock(&fp->fi_lock); 3775 3776 if (status != nfs_ok) 3777 return status; 3778 3779 status = nfsd4_truncate(rqstp, cur_fh, open); 3780 if (status != nfs_ok) 3781 reset_union_bmap_deny(old_deny_bmap, stp); 3782 return status; 3783 } 3784 3785 static void 3786 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session) 3787 { 3788 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; 3789 } 3790 3791 /* Should we give out recallable state?: */ 3792 static bool nfsd4_cb_channel_good(struct nfs4_client *clp) 3793 { 3794 if (clp->cl_cb_state == NFSD4_CB_UP) 3795 return true; 3796 /* 3797 * In the sessions case, since we don't have to establish a 3798 * separate connection for callbacks, we assume it's OK 3799 * until we hear otherwise: 3800 */ 3801 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN; 3802 } 3803 3804 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag) 3805 { 3806 struct file_lock *fl; 3807 3808 fl = locks_alloc_lock(); 3809 if (!fl) 3810 return NULL; 3811 fl->fl_lmops = &nfsd_lease_mng_ops; 3812 fl->fl_flags = FL_DELEG; 3813 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; 3814 fl->fl_end = OFFSET_MAX; 3815 fl->fl_owner = (fl_owner_t)fp; 3816 fl->fl_pid = current->tgid; 3817 return fl; 3818 } 3819 3820 static int nfs4_setlease(struct nfs4_delegation *dp) 3821 { 3822 struct nfs4_file *fp = dp->dl_stid.sc_file; 3823 struct file_lock *fl, *ret; 3824 struct file *filp; 3825 int status = 0; 3826 3827 fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ); 3828 if (!fl) 3829 return -ENOMEM; 3830 filp = find_readable_file(fp); 3831 if (!filp) { 3832 /* We should always have a readable file here */ 3833 WARN_ON_ONCE(1); 3834 return -EBADF; 3835 } 3836 fl->fl_file = filp; 3837 ret = fl; 3838 status = vfs_setlease(filp, fl->fl_type, &fl, NULL); 3839 if (fl) 3840 locks_free_lock(fl); 3841 if (status) 3842 goto out_fput; 3843 spin_lock(&state_lock); 3844 spin_lock(&fp->fi_lock); 3845 /* Did the lease get broken before we took the lock? */ 3846 status = -EAGAIN; 3847 if (fp->fi_had_conflict) 3848 goto out_unlock; 3849 /* Race breaker */ 3850 if (fp->fi_deleg_file) { 3851 status = 0; 3852 ++fp->fi_delegees; 3853 hash_delegation_locked(dp, fp); 3854 goto out_unlock; 3855 } 3856 fp->fi_deleg_file = filp; 3857 fp->fi_delegees = 1; 3858 hash_delegation_locked(dp, fp); 3859 spin_unlock(&fp->fi_lock); 3860 spin_unlock(&state_lock); 3861 return 0; 3862 out_unlock: 3863 spin_unlock(&fp->fi_lock); 3864 spin_unlock(&state_lock); 3865 out_fput: 3866 fput(filp); 3867 return status; 3868 } 3869 3870 static struct nfs4_delegation * 3871 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh, 3872 struct nfs4_file *fp) 3873 { 3874 int status; 3875 struct nfs4_delegation *dp; 3876 3877 if (fp->fi_had_conflict) 3878 return ERR_PTR(-EAGAIN); 3879 3880 dp = alloc_init_deleg(clp, fh); 3881 if (!dp) 3882 return ERR_PTR(-ENOMEM); 3883 3884 get_nfs4_file(fp); 3885 spin_lock(&state_lock); 3886 spin_lock(&fp->fi_lock); 3887 dp->dl_stid.sc_file = fp; 3888 if (!fp->fi_deleg_file) { 3889 spin_unlock(&fp->fi_lock); 3890 spin_unlock(&state_lock); 3891 status = nfs4_setlease(dp); 3892 goto out; 3893 } 3894 if (fp->fi_had_conflict) { 3895 status = -EAGAIN; 3896 goto out_unlock; 3897 } 3898 ++fp->fi_delegees; 3899 hash_delegation_locked(dp, fp); 3900 status = 0; 3901 out_unlock: 3902 spin_unlock(&fp->fi_lock); 3903 spin_unlock(&state_lock); 3904 out: 3905 if (status) { 3906 nfs4_put_stid(&dp->dl_stid); 3907 return ERR_PTR(status); 3908 } 3909 return dp; 3910 } 3911 3912 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status) 3913 { 3914 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; 3915 if (status == -EAGAIN) 3916 open->op_why_no_deleg = WND4_CONTENTION; 3917 else { 3918 open->op_why_no_deleg = WND4_RESOURCE; 3919 switch (open->op_deleg_want) { 3920 case NFS4_SHARE_WANT_READ_DELEG: 3921 case NFS4_SHARE_WANT_WRITE_DELEG: 3922 case NFS4_SHARE_WANT_ANY_DELEG: 3923 break; 3924 case NFS4_SHARE_WANT_CANCEL: 3925 open->op_why_no_deleg = WND4_CANCELLED; 3926 break; 3927 case NFS4_SHARE_WANT_NO_DELEG: 3928 WARN_ON_ONCE(1); 3929 } 3930 } 3931 } 3932 3933 /* 3934 * Attempt to hand out a delegation. 3935 * 3936 * Note we don't support write delegations, and won't until the vfs has 3937 * proper support for them. 3938 */ 3939 static void 3940 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, 3941 struct nfs4_ol_stateid *stp) 3942 { 3943 struct nfs4_delegation *dp; 3944 struct nfs4_openowner *oo = openowner(stp->st_stateowner); 3945 struct nfs4_client *clp = stp->st_stid.sc_client; 3946 int cb_up; 3947 int status = 0; 3948 3949 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client); 3950 open->op_recall = 0; 3951 switch (open->op_claim_type) { 3952 case NFS4_OPEN_CLAIM_PREVIOUS: 3953 if (!cb_up) 3954 open->op_recall = 1; 3955 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ) 3956 goto out_no_deleg; 3957 break; 3958 case NFS4_OPEN_CLAIM_NULL: 3959 case NFS4_OPEN_CLAIM_FH: 3960 /* 3961 * Let's not give out any delegations till everyone's 3962 * had the chance to reclaim theirs.... 3963 */ 3964 if (locks_in_grace(clp->net)) 3965 goto out_no_deleg; 3966 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED)) 3967 goto out_no_deleg; 3968 /* 3969 * Also, if the file was opened for write or 3970 * create, there's a good chance the client's 3971 * about to write to it, resulting in an 3972 * immediate recall (since we don't support 3973 * write delegations): 3974 */ 3975 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 3976 goto out_no_deleg; 3977 if (open->op_create == NFS4_OPEN_CREATE) 3978 goto out_no_deleg; 3979 break; 3980 default: 3981 goto out_no_deleg; 3982 } 3983 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file); 3984 if (IS_ERR(dp)) 3985 goto out_no_deleg; 3986 3987 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid)); 3988 3989 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n", 3990 STATEID_VAL(&dp->dl_stid.sc_stateid)); 3991 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ; 3992 nfs4_put_stid(&dp->dl_stid); 3993 return; 3994 out_no_deleg: 3995 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE; 3996 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS && 3997 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) { 3998 dprintk("NFSD: WARNING: refusing delegation reclaim\n"); 3999 open->op_recall = 1; 4000 } 4001 4002 /* 4.1 client asking for a delegation? */ 4003 if (open->op_deleg_want) 4004 nfsd4_open_deleg_none_ext(open, status); 4005 return; 4006 } 4007 4008 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open, 4009 struct nfs4_delegation *dp) 4010 { 4011 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG && 4012 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { 4013 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; 4014 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE; 4015 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG && 4016 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { 4017 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; 4018 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE; 4019 } 4020 /* Otherwise the client must be confused wanting a delegation 4021 * it already has, therefore we don't return 4022 * NFS4_OPEN_DELEGATE_NONE_EXT and reason. 4023 */ 4024 } 4025 4026 __be32 4027 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 4028 { 4029 struct nfsd4_compoundres *resp = rqstp->rq_resp; 4030 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client; 4031 struct nfs4_file *fp = NULL; 4032 struct nfs4_ol_stateid *stp = NULL; 4033 struct nfs4_delegation *dp = NULL; 4034 __be32 status; 4035 4036 /* 4037 * Lookup file; if found, lookup stateid and check open request, 4038 * and check for delegations in the process of being recalled. 4039 * If not found, create the nfs4_file struct 4040 */ 4041 fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle); 4042 if (fp != open->op_file) { 4043 status = nfs4_check_deleg(cl, open, &dp); 4044 if (status) 4045 goto out; 4046 stp = nfsd4_find_existing_open(fp, open); 4047 } else { 4048 open->op_file = NULL; 4049 status = nfserr_bad_stateid; 4050 if (nfsd4_is_deleg_cur(open)) 4051 goto out; 4052 status = nfserr_jukebox; 4053 } 4054 4055 /* 4056 * OPEN the file, or upgrade an existing OPEN. 4057 * If truncate fails, the OPEN fails. 4058 */ 4059 if (stp) { 4060 /* Stateid was found, this is an OPEN upgrade */ 4061 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); 4062 if (status) 4063 goto out; 4064 } else { 4065 stp = open->op_stp; 4066 open->op_stp = NULL; 4067 init_open_stateid(stp, fp, open); 4068 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open); 4069 if (status) { 4070 release_open_stateid(stp); 4071 goto out; 4072 } 4073 } 4074 update_stateid(&stp->st_stid.sc_stateid); 4075 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); 4076 4077 if (nfsd4_has_session(&resp->cstate)) { 4078 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) { 4079 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; 4080 open->op_why_no_deleg = WND4_NOT_WANTED; 4081 goto nodeleg; 4082 } 4083 } 4084 4085 /* 4086 * Attempt to hand out a delegation. No error return, because the 4087 * OPEN succeeds even if we fail. 4088 */ 4089 nfs4_open_delegation(current_fh, open, stp); 4090 nodeleg: 4091 status = nfs_ok; 4092 4093 dprintk("%s: stateid=" STATEID_FMT "\n", __func__, 4094 STATEID_VAL(&stp->st_stid.sc_stateid)); 4095 out: 4096 /* 4.1 client trying to upgrade/downgrade delegation? */ 4097 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp && 4098 open->op_deleg_want) 4099 nfsd4_deleg_xgrade_none_ext(open, dp); 4100 4101 if (fp) 4102 put_nfs4_file(fp); 4103 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 4104 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate)); 4105 /* 4106 * To finish the open response, we just need to set the rflags. 4107 */ 4108 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 4109 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) && 4110 !nfsd4_has_session(&resp->cstate)) 4111 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 4112 if (dp) 4113 nfs4_put_stid(&dp->dl_stid); 4114 if (stp) 4115 nfs4_put_stid(&stp->st_stid); 4116 4117 return status; 4118 } 4119 4120 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate, 4121 struct nfsd4_open *open, __be32 status) 4122 { 4123 if (open->op_openowner) { 4124 struct nfs4_stateowner *so = &open->op_openowner->oo_owner; 4125 4126 nfsd4_cstate_assign_replay(cstate, so); 4127 nfs4_put_stateowner(so); 4128 } 4129 if (open->op_file) 4130 kmem_cache_free(file_slab, open->op_file); 4131 if (open->op_stp) 4132 nfs4_put_stid(&open->op_stp->st_stid); 4133 } 4134 4135 __be32 4136 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 4137 clientid_t *clid) 4138 { 4139 struct nfs4_client *clp; 4140 __be32 status; 4141 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 4142 4143 dprintk("process_renew(%08x/%08x): starting\n", 4144 clid->cl_boot, clid->cl_id); 4145 status = lookup_clientid(clid, cstate, nn); 4146 if (status) 4147 goto out; 4148 clp = cstate->clp; 4149 status = nfserr_cb_path_down; 4150 if (!list_empty(&clp->cl_delegations) 4151 && clp->cl_cb_state != NFSD4_CB_UP) 4152 goto out; 4153 status = nfs_ok; 4154 out: 4155 return status; 4156 } 4157 4158 void 4159 nfsd4_end_grace(struct nfsd_net *nn) 4160 { 4161 /* do nothing if grace period already ended */ 4162 if (nn->grace_ended) 4163 return; 4164 4165 dprintk("NFSD: end of grace period\n"); 4166 nn->grace_ended = true; 4167 /* 4168 * If the server goes down again right now, an NFSv4 4169 * client will still be allowed to reclaim after it comes back up, 4170 * even if it hasn't yet had a chance to reclaim state this time. 4171 * 4172 */ 4173 nfsd4_record_grace_done(nn); 4174 /* 4175 * At this point, NFSv4 clients can still reclaim. But if the 4176 * server crashes, any that have not yet reclaimed will be out 4177 * of luck on the next boot. 4178 * 4179 * (NFSv4.1+ clients are considered to have reclaimed once they 4180 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to 4181 * have reclaimed after their first OPEN.) 4182 */ 4183 locks_end_grace(&nn->nfsd4_manager); 4184 /* 4185 * At this point, and once lockd and/or any other containers 4186 * exit their grace period, further reclaims will fail and 4187 * regular locking can resume. 4188 */ 4189 } 4190 4191 static time_t 4192 nfs4_laundromat(struct nfsd_net *nn) 4193 { 4194 struct nfs4_client *clp; 4195 struct nfs4_openowner *oo; 4196 struct nfs4_delegation *dp; 4197 struct nfs4_ol_stateid *stp; 4198 struct list_head *pos, *next, reaplist; 4199 time_t cutoff = get_seconds() - nn->nfsd4_lease; 4200 time_t t, new_timeo = nn->nfsd4_lease; 4201 4202 dprintk("NFSD: laundromat service - starting\n"); 4203 nfsd4_end_grace(nn); 4204 INIT_LIST_HEAD(&reaplist); 4205 spin_lock(&nn->client_lock); 4206 list_for_each_safe(pos, next, &nn->client_lru) { 4207 clp = list_entry(pos, struct nfs4_client, cl_lru); 4208 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 4209 t = clp->cl_time - cutoff; 4210 new_timeo = min(new_timeo, t); 4211 break; 4212 } 4213 if (mark_client_expired_locked(clp)) { 4214 dprintk("NFSD: client in use (clientid %08x)\n", 4215 clp->cl_clientid.cl_id); 4216 continue; 4217 } 4218 list_add(&clp->cl_lru, &reaplist); 4219 } 4220 spin_unlock(&nn->client_lock); 4221 list_for_each_safe(pos, next, &reaplist) { 4222 clp = list_entry(pos, struct nfs4_client, cl_lru); 4223 dprintk("NFSD: purging unused client (clientid %08x)\n", 4224 clp->cl_clientid.cl_id); 4225 list_del_init(&clp->cl_lru); 4226 expire_client(clp); 4227 } 4228 spin_lock(&state_lock); 4229 list_for_each_safe(pos, next, &nn->del_recall_lru) { 4230 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4231 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn) 4232 continue; 4233 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 4234 t = dp->dl_time - cutoff; 4235 new_timeo = min(new_timeo, t); 4236 break; 4237 } 4238 unhash_delegation_locked(dp); 4239 list_add(&dp->dl_recall_lru, &reaplist); 4240 } 4241 spin_unlock(&state_lock); 4242 while (!list_empty(&reaplist)) { 4243 dp = list_first_entry(&reaplist, struct nfs4_delegation, 4244 dl_recall_lru); 4245 list_del_init(&dp->dl_recall_lru); 4246 revoke_delegation(dp); 4247 } 4248 4249 spin_lock(&nn->client_lock); 4250 while (!list_empty(&nn->close_lru)) { 4251 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner, 4252 oo_close_lru); 4253 if (time_after((unsigned long)oo->oo_time, 4254 (unsigned long)cutoff)) { 4255 t = oo->oo_time - cutoff; 4256 new_timeo = min(new_timeo, t); 4257 break; 4258 } 4259 list_del_init(&oo->oo_close_lru); 4260 stp = oo->oo_last_closed_stid; 4261 oo->oo_last_closed_stid = NULL; 4262 spin_unlock(&nn->client_lock); 4263 nfs4_put_stid(&stp->st_stid); 4264 spin_lock(&nn->client_lock); 4265 } 4266 spin_unlock(&nn->client_lock); 4267 4268 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT); 4269 return new_timeo; 4270 } 4271 4272 static struct workqueue_struct *laundry_wq; 4273 static void laundromat_main(struct work_struct *); 4274 4275 static void 4276 laundromat_main(struct work_struct *laundry) 4277 { 4278 time_t t; 4279 struct delayed_work *dwork = container_of(laundry, struct delayed_work, 4280 work); 4281 struct nfsd_net *nn = container_of(dwork, struct nfsd_net, 4282 laundromat_work); 4283 4284 t = nfs4_laundromat(nn); 4285 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 4286 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ); 4287 } 4288 4289 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp) 4290 { 4291 if (!fh_match(&fhp->fh_handle, &stp->st_stid.sc_file->fi_fhandle)) 4292 return nfserr_bad_stateid; 4293 return nfs_ok; 4294 } 4295 4296 static inline int 4297 access_permit_read(struct nfs4_ol_stateid *stp) 4298 { 4299 return test_access(NFS4_SHARE_ACCESS_READ, stp) || 4300 test_access(NFS4_SHARE_ACCESS_BOTH, stp) || 4301 test_access(NFS4_SHARE_ACCESS_WRITE, stp); 4302 } 4303 4304 static inline int 4305 access_permit_write(struct nfs4_ol_stateid *stp) 4306 { 4307 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) || 4308 test_access(NFS4_SHARE_ACCESS_BOTH, stp); 4309 } 4310 4311 static 4312 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags) 4313 { 4314 __be32 status = nfserr_openmode; 4315 4316 /* For lock stateid's, we test the parent open, not the lock: */ 4317 if (stp->st_openstp) 4318 stp = stp->st_openstp; 4319 if ((flags & WR_STATE) && !access_permit_write(stp)) 4320 goto out; 4321 if ((flags & RD_STATE) && !access_permit_read(stp)) 4322 goto out; 4323 status = nfs_ok; 4324 out: 4325 return status; 4326 } 4327 4328 static inline __be32 4329 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags) 4330 { 4331 if (ONE_STATEID(stateid) && (flags & RD_STATE)) 4332 return nfs_ok; 4333 else if (locks_in_grace(net)) { 4334 /* Answer in remaining cases depends on existence of 4335 * conflicting state; so we must wait out the grace period. */ 4336 return nfserr_grace; 4337 } else if (flags & WR_STATE) 4338 return nfs4_share_conflict(current_fh, 4339 NFS4_SHARE_DENY_WRITE); 4340 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 4341 return nfs4_share_conflict(current_fh, 4342 NFS4_SHARE_DENY_READ); 4343 } 4344 4345 /* 4346 * Allow READ/WRITE during grace period on recovered state only for files 4347 * that are not able to provide mandatory locking. 4348 */ 4349 static inline int 4350 grace_disallows_io(struct net *net, struct inode *inode) 4351 { 4352 return locks_in_grace(net) && mandatory_lock(inode); 4353 } 4354 4355 /* Returns true iff a is later than b: */ 4356 static bool stateid_generation_after(stateid_t *a, stateid_t *b) 4357 { 4358 return (s32)(a->si_generation - b->si_generation) > 0; 4359 } 4360 4361 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session) 4362 { 4363 /* 4364 * When sessions are used the stateid generation number is ignored 4365 * when it is zero. 4366 */ 4367 if (has_session && in->si_generation == 0) 4368 return nfs_ok; 4369 4370 if (in->si_generation == ref->si_generation) 4371 return nfs_ok; 4372 4373 /* If the client sends us a stateid from the future, it's buggy: */ 4374 if (stateid_generation_after(in, ref)) 4375 return nfserr_bad_stateid; 4376 /* 4377 * However, we could see a stateid from the past, even from a 4378 * non-buggy client. For example, if the client sends a lock 4379 * while some IO is outstanding, the lock may bump si_generation 4380 * while the IO is still in flight. The client could avoid that 4381 * situation by waiting for responses on all the IO requests, 4382 * but better performance may result in retrying IO that 4383 * receives an old_stateid error if requests are rarely 4384 * reordered in flight: 4385 */ 4386 return nfserr_old_stateid; 4387 } 4388 4389 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) 4390 { 4391 struct nfs4_stid *s; 4392 struct nfs4_ol_stateid *ols; 4393 __be32 status = nfserr_bad_stateid; 4394 4395 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 4396 return status; 4397 /* Client debugging aid. */ 4398 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) { 4399 char addr_str[INET6_ADDRSTRLEN]; 4400 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str, 4401 sizeof(addr_str)); 4402 pr_warn_ratelimited("NFSD: client %s testing state ID " 4403 "with incorrect client ID\n", addr_str); 4404 return status; 4405 } 4406 spin_lock(&cl->cl_lock); 4407 s = find_stateid_locked(cl, stateid); 4408 if (!s) 4409 goto out_unlock; 4410 status = check_stateid_generation(stateid, &s->sc_stateid, 1); 4411 if (status) 4412 goto out_unlock; 4413 switch (s->sc_type) { 4414 case NFS4_DELEG_STID: 4415 status = nfs_ok; 4416 break; 4417 case NFS4_REVOKED_DELEG_STID: 4418 status = nfserr_deleg_revoked; 4419 break; 4420 case NFS4_OPEN_STID: 4421 case NFS4_LOCK_STID: 4422 ols = openlockstateid(s); 4423 if (ols->st_stateowner->so_is_open_owner 4424 && !(openowner(ols->st_stateowner)->oo_flags 4425 & NFS4_OO_CONFIRMED)) 4426 status = nfserr_bad_stateid; 4427 else 4428 status = nfs_ok; 4429 break; 4430 default: 4431 printk("unknown stateid type %x\n", s->sc_type); 4432 /* Fallthrough */ 4433 case NFS4_CLOSED_STID: 4434 case NFS4_CLOSED_DELEG_STID: 4435 status = nfserr_bad_stateid; 4436 } 4437 out_unlock: 4438 spin_unlock(&cl->cl_lock); 4439 return status; 4440 } 4441 4442 __be32 4443 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, 4444 stateid_t *stateid, unsigned char typemask, 4445 struct nfs4_stid **s, struct nfsd_net *nn) 4446 { 4447 __be32 status; 4448 4449 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 4450 return nfserr_bad_stateid; 4451 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn); 4452 if (status == nfserr_stale_clientid) { 4453 if (cstate->session) 4454 return nfserr_bad_stateid; 4455 return nfserr_stale_stateid; 4456 } 4457 if (status) 4458 return status; 4459 *s = find_stateid_by_type(cstate->clp, stateid, typemask); 4460 if (!*s) 4461 return nfserr_bad_stateid; 4462 return nfs_ok; 4463 } 4464 4465 /* 4466 * Checks for stateid operations 4467 */ 4468 __be32 4469 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate, 4470 stateid_t *stateid, int flags, struct file **filpp) 4471 { 4472 struct nfs4_stid *s; 4473 struct nfs4_ol_stateid *stp = NULL; 4474 struct nfs4_delegation *dp = NULL; 4475 struct svc_fh *current_fh = &cstate->current_fh; 4476 struct inode *ino = current_fh->fh_dentry->d_inode; 4477 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 4478 struct file *file = NULL; 4479 __be32 status; 4480 4481 if (filpp) 4482 *filpp = NULL; 4483 4484 if (grace_disallows_io(net, ino)) 4485 return nfserr_grace; 4486 4487 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 4488 return check_special_stateids(net, current_fh, stateid, flags); 4489 4490 status = nfsd4_lookup_stateid(cstate, stateid, 4491 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, 4492 &s, nn); 4493 if (status) 4494 return status; 4495 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate)); 4496 if (status) 4497 goto out; 4498 switch (s->sc_type) { 4499 case NFS4_DELEG_STID: 4500 dp = delegstateid(s); 4501 status = nfs4_check_delegmode(dp, flags); 4502 if (status) 4503 goto out; 4504 if (filpp) { 4505 file = dp->dl_stid.sc_file->fi_deleg_file; 4506 if (!file) { 4507 WARN_ON_ONCE(1); 4508 status = nfserr_serverfault; 4509 goto out; 4510 } 4511 get_file(file); 4512 } 4513 break; 4514 case NFS4_OPEN_STID: 4515 case NFS4_LOCK_STID: 4516 stp = openlockstateid(s); 4517 status = nfs4_check_fh(current_fh, stp); 4518 if (status) 4519 goto out; 4520 if (stp->st_stateowner->so_is_open_owner 4521 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED)) 4522 goto out; 4523 status = nfs4_check_openmode(stp, flags); 4524 if (status) 4525 goto out; 4526 if (filpp) { 4527 struct nfs4_file *fp = stp->st_stid.sc_file; 4528 4529 if (flags & RD_STATE) 4530 file = find_readable_file(fp); 4531 else 4532 file = find_writeable_file(fp); 4533 } 4534 break; 4535 default: 4536 status = nfserr_bad_stateid; 4537 goto out; 4538 } 4539 status = nfs_ok; 4540 if (file) 4541 *filpp = file; 4542 out: 4543 nfs4_put_stid(s); 4544 return status; 4545 } 4546 4547 /* 4548 * Test if the stateid is valid 4549 */ 4550 __be32 4551 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 4552 struct nfsd4_test_stateid *test_stateid) 4553 { 4554 struct nfsd4_test_stateid_id *stateid; 4555 struct nfs4_client *cl = cstate->session->se_client; 4556 4557 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list) 4558 stateid->ts_id_status = 4559 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid); 4560 4561 return nfs_ok; 4562 } 4563 4564 __be32 4565 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 4566 struct nfsd4_free_stateid *free_stateid) 4567 { 4568 stateid_t *stateid = &free_stateid->fr_stateid; 4569 struct nfs4_stid *s; 4570 struct nfs4_delegation *dp; 4571 struct nfs4_ol_stateid *stp; 4572 struct nfs4_client *cl = cstate->session->se_client; 4573 __be32 ret = nfserr_bad_stateid; 4574 4575 spin_lock(&cl->cl_lock); 4576 s = find_stateid_locked(cl, stateid); 4577 if (!s) 4578 goto out_unlock; 4579 switch (s->sc_type) { 4580 case NFS4_DELEG_STID: 4581 ret = nfserr_locks_held; 4582 break; 4583 case NFS4_OPEN_STID: 4584 ret = check_stateid_generation(stateid, &s->sc_stateid, 1); 4585 if (ret) 4586 break; 4587 ret = nfserr_locks_held; 4588 break; 4589 case NFS4_LOCK_STID: 4590 ret = check_stateid_generation(stateid, &s->sc_stateid, 1); 4591 if (ret) 4592 break; 4593 stp = openlockstateid(s); 4594 ret = nfserr_locks_held; 4595 if (check_for_locks(stp->st_stid.sc_file, 4596 lockowner(stp->st_stateowner))) 4597 break; 4598 unhash_lock_stateid(stp); 4599 spin_unlock(&cl->cl_lock); 4600 nfs4_put_stid(s); 4601 ret = nfs_ok; 4602 goto out; 4603 case NFS4_REVOKED_DELEG_STID: 4604 dp = delegstateid(s); 4605 list_del_init(&dp->dl_recall_lru); 4606 spin_unlock(&cl->cl_lock); 4607 nfs4_put_stid(s); 4608 ret = nfs_ok; 4609 goto out; 4610 /* Default falls through and returns nfserr_bad_stateid */ 4611 } 4612 out_unlock: 4613 spin_unlock(&cl->cl_lock); 4614 out: 4615 return ret; 4616 } 4617 4618 static inline int 4619 setlkflg (int type) 4620 { 4621 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 4622 RD_STATE : WR_STATE; 4623 } 4624 4625 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp) 4626 { 4627 struct svc_fh *current_fh = &cstate->current_fh; 4628 struct nfs4_stateowner *sop = stp->st_stateowner; 4629 __be32 status; 4630 4631 status = nfsd4_check_seqid(cstate, sop, seqid); 4632 if (status) 4633 return status; 4634 if (stp->st_stid.sc_type == NFS4_CLOSED_STID 4635 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID) 4636 /* 4637 * "Closed" stateid's exist *only* to return 4638 * nfserr_replay_me from the previous step, and 4639 * revoked delegations are kept only for free_stateid. 4640 */ 4641 return nfserr_bad_stateid; 4642 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate)); 4643 if (status) 4644 return status; 4645 return nfs4_check_fh(current_fh, stp); 4646 } 4647 4648 /* 4649 * Checks for sequence id mutating operations. 4650 */ 4651 static __be32 4652 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, 4653 stateid_t *stateid, char typemask, 4654 struct nfs4_ol_stateid **stpp, 4655 struct nfsd_net *nn) 4656 { 4657 __be32 status; 4658 struct nfs4_stid *s; 4659 struct nfs4_ol_stateid *stp = NULL; 4660 4661 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, 4662 seqid, STATEID_VAL(stateid)); 4663 4664 *stpp = NULL; 4665 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn); 4666 if (status) 4667 return status; 4668 stp = openlockstateid(s); 4669 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner); 4670 4671 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp); 4672 if (!status) 4673 *stpp = stp; 4674 else 4675 nfs4_put_stid(&stp->st_stid); 4676 return status; 4677 } 4678 4679 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, 4680 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn) 4681 { 4682 __be32 status; 4683 struct nfs4_openowner *oo; 4684 struct nfs4_ol_stateid *stp; 4685 4686 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid, 4687 NFS4_OPEN_STID, &stp, nn); 4688 if (status) 4689 return status; 4690 oo = openowner(stp->st_stateowner); 4691 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { 4692 nfs4_put_stid(&stp->st_stid); 4693 return nfserr_bad_stateid; 4694 } 4695 *stpp = stp; 4696 return nfs_ok; 4697 } 4698 4699 __be32 4700 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 4701 struct nfsd4_open_confirm *oc) 4702 { 4703 __be32 status; 4704 struct nfs4_openowner *oo; 4705 struct nfs4_ol_stateid *stp; 4706 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 4707 4708 dprintk("NFSD: nfsd4_open_confirm on file %pd\n", 4709 cstate->current_fh.fh_dentry); 4710 4711 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); 4712 if (status) 4713 return status; 4714 4715 status = nfs4_preprocess_seqid_op(cstate, 4716 oc->oc_seqid, &oc->oc_req_stateid, 4717 NFS4_OPEN_STID, &stp, nn); 4718 if (status) 4719 goto out; 4720 oo = openowner(stp->st_stateowner); 4721 status = nfserr_bad_stateid; 4722 if (oo->oo_flags & NFS4_OO_CONFIRMED) 4723 goto put_stateid; 4724 oo->oo_flags |= NFS4_OO_CONFIRMED; 4725 update_stateid(&stp->st_stid.sc_stateid); 4726 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); 4727 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", 4728 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid)); 4729 4730 nfsd4_client_record_create(oo->oo_owner.so_client); 4731 status = nfs_ok; 4732 put_stateid: 4733 nfs4_put_stid(&stp->st_stid); 4734 out: 4735 nfsd4_bump_seqid(cstate, status); 4736 return status; 4737 } 4738 4739 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access) 4740 { 4741 if (!test_access(access, stp)) 4742 return; 4743 nfs4_file_put_access(stp->st_stid.sc_file, access); 4744 clear_access(access, stp); 4745 } 4746 4747 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access) 4748 { 4749 switch (to_access) { 4750 case NFS4_SHARE_ACCESS_READ: 4751 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE); 4752 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); 4753 break; 4754 case NFS4_SHARE_ACCESS_WRITE: 4755 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ); 4756 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); 4757 break; 4758 case NFS4_SHARE_ACCESS_BOTH: 4759 break; 4760 default: 4761 WARN_ON_ONCE(1); 4762 } 4763 } 4764 4765 __be32 4766 nfsd4_open_downgrade(struct svc_rqst *rqstp, 4767 struct nfsd4_compound_state *cstate, 4768 struct nfsd4_open_downgrade *od) 4769 { 4770 __be32 status; 4771 struct nfs4_ol_stateid *stp; 4772 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 4773 4774 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", 4775 cstate->current_fh.fh_dentry); 4776 4777 /* We don't yet support WANT bits: */ 4778 if (od->od_deleg_want) 4779 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__, 4780 od->od_deleg_want); 4781 4782 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid, 4783 &od->od_stateid, &stp, nn); 4784 if (status) 4785 goto out; 4786 status = nfserr_inval; 4787 if (!test_access(od->od_share_access, stp)) { 4788 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n", 4789 stp->st_access_bmap, od->od_share_access); 4790 goto put_stateid; 4791 } 4792 if (!test_deny(od->od_share_deny, stp)) { 4793 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n", 4794 stp->st_deny_bmap, od->od_share_deny); 4795 goto put_stateid; 4796 } 4797 nfs4_stateid_downgrade(stp, od->od_share_access); 4798 4799 reset_union_bmap_deny(od->od_share_deny, stp); 4800 4801 update_stateid(&stp->st_stid.sc_stateid); 4802 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); 4803 status = nfs_ok; 4804 put_stateid: 4805 nfs4_put_stid(&stp->st_stid); 4806 out: 4807 nfsd4_bump_seqid(cstate, status); 4808 return status; 4809 } 4810 4811 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s) 4812 { 4813 struct nfs4_client *clp = s->st_stid.sc_client; 4814 LIST_HEAD(reaplist); 4815 4816 s->st_stid.sc_type = NFS4_CLOSED_STID; 4817 spin_lock(&clp->cl_lock); 4818 unhash_open_stateid(s, &reaplist); 4819 4820 if (clp->cl_minorversion) { 4821 put_ol_stateid_locked(s, &reaplist); 4822 spin_unlock(&clp->cl_lock); 4823 free_ol_stateid_reaplist(&reaplist); 4824 } else { 4825 spin_unlock(&clp->cl_lock); 4826 free_ol_stateid_reaplist(&reaplist); 4827 move_to_close_lru(s, clp->net); 4828 } 4829 } 4830 4831 /* 4832 * nfs4_unlock_state() called after encode 4833 */ 4834 __be32 4835 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 4836 struct nfsd4_close *close) 4837 { 4838 __be32 status; 4839 struct nfs4_ol_stateid *stp; 4840 struct net *net = SVC_NET(rqstp); 4841 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 4842 4843 dprintk("NFSD: nfsd4_close on file %pd\n", 4844 cstate->current_fh.fh_dentry); 4845 4846 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid, 4847 &close->cl_stateid, 4848 NFS4_OPEN_STID|NFS4_CLOSED_STID, 4849 &stp, nn); 4850 nfsd4_bump_seqid(cstate, status); 4851 if (status) 4852 goto out; 4853 update_stateid(&stp->st_stid.sc_stateid); 4854 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); 4855 4856 nfsd4_return_all_file_layouts(stp->st_stateowner->so_client, 4857 stp->st_stid.sc_file); 4858 4859 nfsd4_close_open_stateid(stp); 4860 4861 /* put reference from nfs4_preprocess_seqid_op */ 4862 nfs4_put_stid(&stp->st_stid); 4863 out: 4864 return status; 4865 } 4866 4867 __be32 4868 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 4869 struct nfsd4_delegreturn *dr) 4870 { 4871 struct nfs4_delegation *dp; 4872 stateid_t *stateid = &dr->dr_stateid; 4873 struct nfs4_stid *s; 4874 __be32 status; 4875 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 4876 4877 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 4878 return status; 4879 4880 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn); 4881 if (status) 4882 goto out; 4883 dp = delegstateid(s); 4884 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate)); 4885 if (status) 4886 goto put_stateid; 4887 4888 destroy_delegation(dp); 4889 put_stateid: 4890 nfs4_put_stid(&dp->dl_stid); 4891 out: 4892 return status; 4893 } 4894 4895 4896 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 4897 4898 static inline u64 4899 end_offset(u64 start, u64 len) 4900 { 4901 u64 end; 4902 4903 end = start + len; 4904 return end >= start ? end: NFS4_MAX_UINT64; 4905 } 4906 4907 /* last octet in a range */ 4908 static inline u64 4909 last_byte_offset(u64 start, u64 len) 4910 { 4911 u64 end; 4912 4913 WARN_ON_ONCE(!len); 4914 end = start + len; 4915 return end > start ? end - 1: NFS4_MAX_UINT64; 4916 } 4917 4918 /* 4919 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 4920 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 4921 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 4922 * locking, this prevents us from being completely protocol-compliant. The 4923 * real solution to this problem is to start using unsigned file offsets in 4924 * the VFS, but this is a very deep change! 4925 */ 4926 static inline void 4927 nfs4_transform_lock_offset(struct file_lock *lock) 4928 { 4929 if (lock->fl_start < 0) 4930 lock->fl_start = OFFSET_MAX; 4931 if (lock->fl_end < 0) 4932 lock->fl_end = OFFSET_MAX; 4933 } 4934 4935 static fl_owner_t 4936 nfsd4_fl_get_owner(fl_owner_t owner) 4937 { 4938 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; 4939 4940 nfs4_get_stateowner(&lo->lo_owner); 4941 return owner; 4942 } 4943 4944 static void 4945 nfsd4_fl_put_owner(fl_owner_t owner) 4946 { 4947 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; 4948 4949 if (lo) 4950 nfs4_put_stateowner(&lo->lo_owner); 4951 } 4952 4953 static const struct lock_manager_operations nfsd_posix_mng_ops = { 4954 .lm_get_owner = nfsd4_fl_get_owner, 4955 .lm_put_owner = nfsd4_fl_put_owner, 4956 }; 4957 4958 static inline void 4959 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 4960 { 4961 struct nfs4_lockowner *lo; 4962 4963 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 4964 lo = (struct nfs4_lockowner *) fl->fl_owner; 4965 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data, 4966 lo->lo_owner.so_owner.len, GFP_KERNEL); 4967 if (!deny->ld_owner.data) 4968 /* We just don't care that much */ 4969 goto nevermind; 4970 deny->ld_owner.len = lo->lo_owner.so_owner.len; 4971 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid; 4972 } else { 4973 nevermind: 4974 deny->ld_owner.len = 0; 4975 deny->ld_owner.data = NULL; 4976 deny->ld_clientid.cl_boot = 0; 4977 deny->ld_clientid.cl_id = 0; 4978 } 4979 deny->ld_start = fl->fl_start; 4980 deny->ld_length = NFS4_MAX_UINT64; 4981 if (fl->fl_end != NFS4_MAX_UINT64) 4982 deny->ld_length = fl->fl_end - fl->fl_start + 1; 4983 deny->ld_type = NFS4_READ_LT; 4984 if (fl->fl_type != F_RDLCK) 4985 deny->ld_type = NFS4_WRITE_LT; 4986 } 4987 4988 static struct nfs4_lockowner * 4989 find_lockowner_str_locked(clientid_t *clid, struct xdr_netobj *owner, 4990 struct nfs4_client *clp) 4991 { 4992 unsigned int strhashval = ownerstr_hashval(owner); 4993 struct nfs4_stateowner *so; 4994 4995 lockdep_assert_held(&clp->cl_lock); 4996 4997 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval], 4998 so_strhash) { 4999 if (so->so_is_open_owner) 5000 continue; 5001 if (same_owner_str(so, owner)) 5002 return lockowner(nfs4_get_stateowner(so)); 5003 } 5004 return NULL; 5005 } 5006 5007 static struct nfs4_lockowner * 5008 find_lockowner_str(clientid_t *clid, struct xdr_netobj *owner, 5009 struct nfs4_client *clp) 5010 { 5011 struct nfs4_lockowner *lo; 5012 5013 spin_lock(&clp->cl_lock); 5014 lo = find_lockowner_str_locked(clid, owner, clp); 5015 spin_unlock(&clp->cl_lock); 5016 return lo; 5017 } 5018 5019 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop) 5020 { 5021 unhash_lockowner_locked(lockowner(sop)); 5022 } 5023 5024 static void nfs4_free_lockowner(struct nfs4_stateowner *sop) 5025 { 5026 struct nfs4_lockowner *lo = lockowner(sop); 5027 5028 kmem_cache_free(lockowner_slab, lo); 5029 } 5030 5031 static const struct nfs4_stateowner_operations lockowner_ops = { 5032 .so_unhash = nfs4_unhash_lockowner, 5033 .so_free = nfs4_free_lockowner, 5034 }; 5035 5036 /* 5037 * Alloc a lock owner structure. 5038 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 5039 * occurred. 5040 * 5041 * strhashval = ownerstr_hashval 5042 */ 5043 static struct nfs4_lockowner * 5044 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, 5045 struct nfs4_ol_stateid *open_stp, 5046 struct nfsd4_lock *lock) 5047 { 5048 struct nfs4_lockowner *lo, *ret; 5049 5050 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp); 5051 if (!lo) 5052 return NULL; 5053 INIT_LIST_HEAD(&lo->lo_owner.so_stateids); 5054 lo->lo_owner.so_is_open_owner = 0; 5055 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid; 5056 lo->lo_owner.so_ops = &lockowner_ops; 5057 spin_lock(&clp->cl_lock); 5058 ret = find_lockowner_str_locked(&clp->cl_clientid, 5059 &lock->lk_new_owner, clp); 5060 if (ret == NULL) { 5061 list_add(&lo->lo_owner.so_strhash, 5062 &clp->cl_ownerstr_hashtbl[strhashval]); 5063 ret = lo; 5064 } else 5065 nfs4_free_lockowner(&lo->lo_owner); 5066 spin_unlock(&clp->cl_lock); 5067 return ret; 5068 } 5069 5070 static void 5071 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo, 5072 struct nfs4_file *fp, struct inode *inode, 5073 struct nfs4_ol_stateid *open_stp) 5074 { 5075 struct nfs4_client *clp = lo->lo_owner.so_client; 5076 5077 lockdep_assert_held(&clp->cl_lock); 5078 5079 atomic_inc(&stp->st_stid.sc_count); 5080 stp->st_stid.sc_type = NFS4_LOCK_STID; 5081 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner); 5082 get_nfs4_file(fp); 5083 stp->st_stid.sc_file = fp; 5084 stp->st_stid.sc_free = nfs4_free_lock_stateid; 5085 stp->st_access_bmap = 0; 5086 stp->st_deny_bmap = open_stp->st_deny_bmap; 5087 stp->st_openstp = open_stp; 5088 list_add(&stp->st_locks, &open_stp->st_locks); 5089 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids); 5090 spin_lock(&fp->fi_lock); 5091 list_add(&stp->st_perfile, &fp->fi_stateids); 5092 spin_unlock(&fp->fi_lock); 5093 } 5094 5095 static struct nfs4_ol_stateid * 5096 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp) 5097 { 5098 struct nfs4_ol_stateid *lst; 5099 struct nfs4_client *clp = lo->lo_owner.so_client; 5100 5101 lockdep_assert_held(&clp->cl_lock); 5102 5103 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) { 5104 if (lst->st_stid.sc_file == fp) { 5105 atomic_inc(&lst->st_stid.sc_count); 5106 return lst; 5107 } 5108 } 5109 return NULL; 5110 } 5111 5112 static struct nfs4_ol_stateid * 5113 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi, 5114 struct inode *inode, struct nfs4_ol_stateid *ost, 5115 bool *new) 5116 { 5117 struct nfs4_stid *ns = NULL; 5118 struct nfs4_ol_stateid *lst; 5119 struct nfs4_openowner *oo = openowner(ost->st_stateowner); 5120 struct nfs4_client *clp = oo->oo_owner.so_client; 5121 5122 spin_lock(&clp->cl_lock); 5123 lst = find_lock_stateid(lo, fi); 5124 if (lst == NULL) { 5125 spin_unlock(&clp->cl_lock); 5126 ns = nfs4_alloc_stid(clp, stateid_slab); 5127 if (ns == NULL) 5128 return NULL; 5129 5130 spin_lock(&clp->cl_lock); 5131 lst = find_lock_stateid(lo, fi); 5132 if (likely(!lst)) { 5133 lst = openlockstateid(ns); 5134 init_lock_stateid(lst, lo, fi, inode, ost); 5135 ns = NULL; 5136 *new = true; 5137 } 5138 } 5139 spin_unlock(&clp->cl_lock); 5140 if (ns) 5141 nfs4_put_stid(ns); 5142 return lst; 5143 } 5144 5145 static int 5146 check_lock_length(u64 offset, u64 length) 5147 { 5148 return ((length == 0) || ((length != NFS4_MAX_UINT64) && 5149 LOFF_OVERFLOW(offset, length))); 5150 } 5151 5152 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access) 5153 { 5154 struct nfs4_file *fp = lock_stp->st_stid.sc_file; 5155 5156 lockdep_assert_held(&fp->fi_lock); 5157 5158 if (test_access(access, lock_stp)) 5159 return; 5160 __nfs4_file_get_access(fp, access); 5161 set_access(access, lock_stp); 5162 } 5163 5164 static __be32 5165 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, 5166 struct nfs4_ol_stateid *ost, 5167 struct nfsd4_lock *lock, 5168 struct nfs4_ol_stateid **lst, bool *new) 5169 { 5170 __be32 status; 5171 struct nfs4_file *fi = ost->st_stid.sc_file; 5172 struct nfs4_openowner *oo = openowner(ost->st_stateowner); 5173 struct nfs4_client *cl = oo->oo_owner.so_client; 5174 struct inode *inode = cstate->current_fh.fh_dentry->d_inode; 5175 struct nfs4_lockowner *lo; 5176 unsigned int strhashval; 5177 5178 lo = find_lockowner_str(&cl->cl_clientid, &lock->v.new.owner, cl); 5179 if (!lo) { 5180 strhashval = ownerstr_hashval(&lock->v.new.owner); 5181 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock); 5182 if (lo == NULL) 5183 return nfserr_jukebox; 5184 } else { 5185 /* with an existing lockowner, seqids must be the same */ 5186 status = nfserr_bad_seqid; 5187 if (!cstate->minorversion && 5188 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid) 5189 goto out; 5190 } 5191 5192 *lst = find_or_create_lock_stateid(lo, fi, inode, ost, new); 5193 if (*lst == NULL) { 5194 status = nfserr_jukebox; 5195 goto out; 5196 } 5197 status = nfs_ok; 5198 out: 5199 nfs4_put_stateowner(&lo->lo_owner); 5200 return status; 5201 } 5202 5203 /* 5204 * LOCK operation 5205 */ 5206 __be32 5207 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 5208 struct nfsd4_lock *lock) 5209 { 5210 struct nfs4_openowner *open_sop = NULL; 5211 struct nfs4_lockowner *lock_sop = NULL; 5212 struct nfs4_ol_stateid *lock_stp = NULL; 5213 struct nfs4_ol_stateid *open_stp = NULL; 5214 struct nfs4_file *fp; 5215 struct file *filp = NULL; 5216 struct file_lock *file_lock = NULL; 5217 struct file_lock *conflock = NULL; 5218 __be32 status = 0; 5219 int lkflg; 5220 int err; 5221 bool new = false; 5222 struct net *net = SVC_NET(rqstp); 5223 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 5224 5225 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 5226 (long long) lock->lk_offset, 5227 (long long) lock->lk_length); 5228 5229 if (check_lock_length(lock->lk_offset, lock->lk_length)) 5230 return nfserr_inval; 5231 5232 if ((status = fh_verify(rqstp, &cstate->current_fh, 5233 S_IFREG, NFSD_MAY_LOCK))) { 5234 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 5235 return status; 5236 } 5237 5238 if (lock->lk_is_new) { 5239 if (nfsd4_has_session(cstate)) 5240 /* See rfc 5661 18.10.3: given clientid is ignored: */ 5241 memcpy(&lock->v.new.clientid, 5242 &cstate->session->se_client->cl_clientid, 5243 sizeof(clientid_t)); 5244 5245 status = nfserr_stale_clientid; 5246 if (STALE_CLIENTID(&lock->lk_new_clientid, nn)) 5247 goto out; 5248 5249 /* validate and update open stateid and open seqid */ 5250 status = nfs4_preprocess_confirmed_seqid_op(cstate, 5251 lock->lk_new_open_seqid, 5252 &lock->lk_new_open_stateid, 5253 &open_stp, nn); 5254 if (status) 5255 goto out; 5256 open_sop = openowner(open_stp->st_stateowner); 5257 status = nfserr_bad_stateid; 5258 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid, 5259 &lock->v.new.clientid)) 5260 goto out; 5261 status = lookup_or_create_lock_state(cstate, open_stp, lock, 5262 &lock_stp, &new); 5263 } else { 5264 status = nfs4_preprocess_seqid_op(cstate, 5265 lock->lk_old_lock_seqid, 5266 &lock->lk_old_lock_stateid, 5267 NFS4_LOCK_STID, &lock_stp, nn); 5268 } 5269 if (status) 5270 goto out; 5271 lock_sop = lockowner(lock_stp->st_stateowner); 5272 5273 lkflg = setlkflg(lock->lk_type); 5274 status = nfs4_check_openmode(lock_stp, lkflg); 5275 if (status) 5276 goto out; 5277 5278 status = nfserr_grace; 5279 if (locks_in_grace(net) && !lock->lk_reclaim) 5280 goto out; 5281 status = nfserr_no_grace; 5282 if (!locks_in_grace(net) && lock->lk_reclaim) 5283 goto out; 5284 5285 file_lock = locks_alloc_lock(); 5286 if (!file_lock) { 5287 dprintk("NFSD: %s: unable to allocate lock!\n", __func__); 5288 status = nfserr_jukebox; 5289 goto out; 5290 } 5291 5292 fp = lock_stp->st_stid.sc_file; 5293 switch (lock->lk_type) { 5294 case NFS4_READ_LT: 5295 case NFS4_READW_LT: 5296 spin_lock(&fp->fi_lock); 5297 filp = find_readable_file_locked(fp); 5298 if (filp) 5299 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ); 5300 spin_unlock(&fp->fi_lock); 5301 file_lock->fl_type = F_RDLCK; 5302 break; 5303 case NFS4_WRITE_LT: 5304 case NFS4_WRITEW_LT: 5305 spin_lock(&fp->fi_lock); 5306 filp = find_writeable_file_locked(fp); 5307 if (filp) 5308 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE); 5309 spin_unlock(&fp->fi_lock); 5310 file_lock->fl_type = F_WRLCK; 5311 break; 5312 default: 5313 status = nfserr_inval; 5314 goto out; 5315 } 5316 if (!filp) { 5317 status = nfserr_openmode; 5318 goto out; 5319 } 5320 5321 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner)); 5322 file_lock->fl_pid = current->tgid; 5323 file_lock->fl_file = filp; 5324 file_lock->fl_flags = FL_POSIX; 5325 file_lock->fl_lmops = &nfsd_posix_mng_ops; 5326 file_lock->fl_start = lock->lk_offset; 5327 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); 5328 nfs4_transform_lock_offset(file_lock); 5329 5330 conflock = locks_alloc_lock(); 5331 if (!conflock) { 5332 dprintk("NFSD: %s: unable to allocate lock!\n", __func__); 5333 status = nfserr_jukebox; 5334 goto out; 5335 } 5336 5337 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock); 5338 switch (-err) { 5339 case 0: /* success! */ 5340 update_stateid(&lock_stp->st_stid.sc_stateid); 5341 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid, 5342 sizeof(stateid_t)); 5343 status = 0; 5344 break; 5345 case (EAGAIN): /* conflock holds conflicting lock */ 5346 status = nfserr_denied; 5347 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 5348 nfs4_set_lock_denied(conflock, &lock->lk_denied); 5349 break; 5350 case (EDEADLK): 5351 status = nfserr_deadlock; 5352 break; 5353 default: 5354 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); 5355 status = nfserrno(err); 5356 break; 5357 } 5358 out: 5359 if (filp) 5360 fput(filp); 5361 if (lock_stp) { 5362 /* Bump seqid manually if the 4.0 replay owner is openowner */ 5363 if (cstate->replay_owner && 5364 cstate->replay_owner != &lock_sop->lo_owner && 5365 seqid_mutating_err(ntohl(status))) 5366 lock_sop->lo_owner.so_seqid++; 5367 5368 /* 5369 * If this is a new, never-before-used stateid, and we are 5370 * returning an error, then just go ahead and release it. 5371 */ 5372 if (status && new) 5373 release_lock_stateid(lock_stp); 5374 5375 nfs4_put_stid(&lock_stp->st_stid); 5376 } 5377 if (open_stp) 5378 nfs4_put_stid(&open_stp->st_stid); 5379 nfsd4_bump_seqid(cstate, status); 5380 if (file_lock) 5381 locks_free_lock(file_lock); 5382 if (conflock) 5383 locks_free_lock(conflock); 5384 return status; 5385 } 5386 5387 /* 5388 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, 5389 * so we do a temporary open here just to get an open file to pass to 5390 * vfs_test_lock. (Arguably perhaps test_lock should be done with an 5391 * inode operation.) 5392 */ 5393 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) 5394 { 5395 struct file *file; 5396 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 5397 if (!err) { 5398 err = nfserrno(vfs_test_lock(file, lock)); 5399 nfsd_close(file); 5400 } 5401 return err; 5402 } 5403 5404 /* 5405 * LOCKT operation 5406 */ 5407 __be32 5408 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 5409 struct nfsd4_lockt *lockt) 5410 { 5411 struct file_lock *file_lock = NULL; 5412 struct nfs4_lockowner *lo = NULL; 5413 __be32 status; 5414 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 5415 5416 if (locks_in_grace(SVC_NET(rqstp))) 5417 return nfserr_grace; 5418 5419 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 5420 return nfserr_inval; 5421 5422 if (!nfsd4_has_session(cstate)) { 5423 status = lookup_clientid(&lockt->lt_clientid, cstate, nn); 5424 if (status) 5425 goto out; 5426 } 5427 5428 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 5429 goto out; 5430 5431 file_lock = locks_alloc_lock(); 5432 if (!file_lock) { 5433 dprintk("NFSD: %s: unable to allocate lock!\n", __func__); 5434 status = nfserr_jukebox; 5435 goto out; 5436 } 5437 5438 switch (lockt->lt_type) { 5439 case NFS4_READ_LT: 5440 case NFS4_READW_LT: 5441 file_lock->fl_type = F_RDLCK; 5442 break; 5443 case NFS4_WRITE_LT: 5444 case NFS4_WRITEW_LT: 5445 file_lock->fl_type = F_WRLCK; 5446 break; 5447 default: 5448 dprintk("NFSD: nfs4_lockt: bad lock type!\n"); 5449 status = nfserr_inval; 5450 goto out; 5451 } 5452 5453 lo = find_lockowner_str(&lockt->lt_clientid, &lockt->lt_owner, 5454 cstate->clp); 5455 if (lo) 5456 file_lock->fl_owner = (fl_owner_t)lo; 5457 file_lock->fl_pid = current->tgid; 5458 file_lock->fl_flags = FL_POSIX; 5459 5460 file_lock->fl_start = lockt->lt_offset; 5461 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); 5462 5463 nfs4_transform_lock_offset(file_lock); 5464 5465 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock); 5466 if (status) 5467 goto out; 5468 5469 if (file_lock->fl_type != F_UNLCK) { 5470 status = nfserr_denied; 5471 nfs4_set_lock_denied(file_lock, &lockt->lt_denied); 5472 } 5473 out: 5474 if (lo) 5475 nfs4_put_stateowner(&lo->lo_owner); 5476 if (file_lock) 5477 locks_free_lock(file_lock); 5478 return status; 5479 } 5480 5481 __be32 5482 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 5483 struct nfsd4_locku *locku) 5484 { 5485 struct nfs4_ol_stateid *stp; 5486 struct file *filp = NULL; 5487 struct file_lock *file_lock = NULL; 5488 __be32 status; 5489 int err; 5490 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 5491 5492 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 5493 (long long) locku->lu_offset, 5494 (long long) locku->lu_length); 5495 5496 if (check_lock_length(locku->lu_offset, locku->lu_length)) 5497 return nfserr_inval; 5498 5499 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid, 5500 &locku->lu_stateid, NFS4_LOCK_STID, 5501 &stp, nn); 5502 if (status) 5503 goto out; 5504 filp = find_any_file(stp->st_stid.sc_file); 5505 if (!filp) { 5506 status = nfserr_lock_range; 5507 goto put_stateid; 5508 } 5509 file_lock = locks_alloc_lock(); 5510 if (!file_lock) { 5511 dprintk("NFSD: %s: unable to allocate lock!\n", __func__); 5512 status = nfserr_jukebox; 5513 goto fput; 5514 } 5515 5516 file_lock->fl_type = F_UNLCK; 5517 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner)); 5518 file_lock->fl_pid = current->tgid; 5519 file_lock->fl_file = filp; 5520 file_lock->fl_flags = FL_POSIX; 5521 file_lock->fl_lmops = &nfsd_posix_mng_ops; 5522 file_lock->fl_start = locku->lu_offset; 5523 5524 file_lock->fl_end = last_byte_offset(locku->lu_offset, 5525 locku->lu_length); 5526 nfs4_transform_lock_offset(file_lock); 5527 5528 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL); 5529 if (err) { 5530 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); 5531 goto out_nfserr; 5532 } 5533 update_stateid(&stp->st_stid.sc_stateid); 5534 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); 5535 fput: 5536 fput(filp); 5537 put_stateid: 5538 nfs4_put_stid(&stp->st_stid); 5539 out: 5540 nfsd4_bump_seqid(cstate, status); 5541 if (file_lock) 5542 locks_free_lock(file_lock); 5543 return status; 5544 5545 out_nfserr: 5546 status = nfserrno(err); 5547 goto fput; 5548 } 5549 5550 /* 5551 * returns 5552 * true: locks held by lockowner 5553 * false: no locks held by lockowner 5554 */ 5555 static bool 5556 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner) 5557 { 5558 struct file_lock *fl; 5559 int status = false; 5560 struct file *filp = find_any_file(fp); 5561 struct inode *inode; 5562 struct file_lock_context *flctx; 5563 5564 if (!filp) { 5565 /* Any valid lock stateid should have some sort of access */ 5566 WARN_ON_ONCE(1); 5567 return status; 5568 } 5569 5570 inode = file_inode(filp); 5571 flctx = inode->i_flctx; 5572 5573 if (flctx && !list_empty_careful(&flctx->flc_posix)) { 5574 spin_lock(&flctx->flc_lock); 5575 list_for_each_entry(fl, &flctx->flc_posix, fl_list) { 5576 if (fl->fl_owner == (fl_owner_t)lowner) { 5577 status = true; 5578 break; 5579 } 5580 } 5581 spin_unlock(&flctx->flc_lock); 5582 } 5583 fput(filp); 5584 return status; 5585 } 5586 5587 __be32 5588 nfsd4_release_lockowner(struct svc_rqst *rqstp, 5589 struct nfsd4_compound_state *cstate, 5590 struct nfsd4_release_lockowner *rlockowner) 5591 { 5592 clientid_t *clid = &rlockowner->rl_clientid; 5593 struct nfs4_stateowner *sop; 5594 struct nfs4_lockowner *lo = NULL; 5595 struct nfs4_ol_stateid *stp; 5596 struct xdr_netobj *owner = &rlockowner->rl_owner; 5597 unsigned int hashval = ownerstr_hashval(owner); 5598 __be32 status; 5599 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 5600 struct nfs4_client *clp; 5601 5602 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 5603 clid->cl_boot, clid->cl_id); 5604 5605 status = lookup_clientid(clid, cstate, nn); 5606 if (status) 5607 return status; 5608 5609 clp = cstate->clp; 5610 /* Find the matching lock stateowner */ 5611 spin_lock(&clp->cl_lock); 5612 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval], 5613 so_strhash) { 5614 5615 if (sop->so_is_open_owner || !same_owner_str(sop, owner)) 5616 continue; 5617 5618 /* see if there are still any locks associated with it */ 5619 lo = lockowner(sop); 5620 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) { 5621 if (check_for_locks(stp->st_stid.sc_file, lo)) { 5622 status = nfserr_locks_held; 5623 spin_unlock(&clp->cl_lock); 5624 return status; 5625 } 5626 } 5627 5628 nfs4_get_stateowner(sop); 5629 break; 5630 } 5631 spin_unlock(&clp->cl_lock); 5632 if (lo) 5633 release_lockowner(lo); 5634 return status; 5635 } 5636 5637 static inline struct nfs4_client_reclaim * 5638 alloc_reclaim(void) 5639 { 5640 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 5641 } 5642 5643 bool 5644 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn) 5645 { 5646 struct nfs4_client_reclaim *crp; 5647 5648 crp = nfsd4_find_reclaim_client(name, nn); 5649 return (crp && crp->cr_clp); 5650 } 5651 5652 /* 5653 * failure => all reset bets are off, nfserr_no_grace... 5654 */ 5655 struct nfs4_client_reclaim * 5656 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn) 5657 { 5658 unsigned int strhashval; 5659 struct nfs4_client_reclaim *crp; 5660 5661 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 5662 crp = alloc_reclaim(); 5663 if (crp) { 5664 strhashval = clientstr_hashval(name); 5665 INIT_LIST_HEAD(&crp->cr_strhash); 5666 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]); 5667 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 5668 crp->cr_clp = NULL; 5669 nn->reclaim_str_hashtbl_size++; 5670 } 5671 return crp; 5672 } 5673 5674 void 5675 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn) 5676 { 5677 list_del(&crp->cr_strhash); 5678 kfree(crp); 5679 nn->reclaim_str_hashtbl_size--; 5680 } 5681 5682 void 5683 nfs4_release_reclaim(struct nfsd_net *nn) 5684 { 5685 struct nfs4_client_reclaim *crp = NULL; 5686 int i; 5687 5688 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 5689 while (!list_empty(&nn->reclaim_str_hashtbl[i])) { 5690 crp = list_entry(nn->reclaim_str_hashtbl[i].next, 5691 struct nfs4_client_reclaim, cr_strhash); 5692 nfs4_remove_reclaim_record(crp, nn); 5693 } 5694 } 5695 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size); 5696 } 5697 5698 /* 5699 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 5700 struct nfs4_client_reclaim * 5701 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn) 5702 { 5703 unsigned int strhashval; 5704 struct nfs4_client_reclaim *crp = NULL; 5705 5706 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir); 5707 5708 strhashval = clientstr_hashval(recdir); 5709 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) { 5710 if (same_name(crp->cr_recdir, recdir)) { 5711 return crp; 5712 } 5713 } 5714 return NULL; 5715 } 5716 5717 /* 5718 * Called from OPEN. Look for clientid in reclaim list. 5719 */ 5720 __be32 5721 nfs4_check_open_reclaim(clientid_t *clid, 5722 struct nfsd4_compound_state *cstate, 5723 struct nfsd_net *nn) 5724 { 5725 __be32 status; 5726 5727 /* find clientid in conf_id_hashtbl */ 5728 status = lookup_clientid(clid, cstate, nn); 5729 if (status) 5730 return nfserr_reclaim_bad; 5731 5732 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags)) 5733 return nfserr_no_grace; 5734 5735 if (nfsd4_client_record_check(cstate->clp)) 5736 return nfserr_reclaim_bad; 5737 5738 return nfs_ok; 5739 } 5740 5741 #ifdef CONFIG_NFSD_FAULT_INJECTION 5742 static inline void 5743 put_client(struct nfs4_client *clp) 5744 { 5745 atomic_dec(&clp->cl_refcount); 5746 } 5747 5748 static struct nfs4_client * 5749 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size) 5750 { 5751 struct nfs4_client *clp; 5752 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5753 nfsd_net_id); 5754 5755 if (!nfsd_netns_ready(nn)) 5756 return NULL; 5757 5758 list_for_each_entry(clp, &nn->client_lru, cl_lru) { 5759 if (memcmp(&clp->cl_addr, addr, addr_size) == 0) 5760 return clp; 5761 } 5762 return NULL; 5763 } 5764 5765 u64 5766 nfsd_inject_print_clients(void) 5767 { 5768 struct nfs4_client *clp; 5769 u64 count = 0; 5770 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5771 nfsd_net_id); 5772 char buf[INET6_ADDRSTRLEN]; 5773 5774 if (!nfsd_netns_ready(nn)) 5775 return 0; 5776 5777 spin_lock(&nn->client_lock); 5778 list_for_each_entry(clp, &nn->client_lru, cl_lru) { 5779 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf)); 5780 pr_info("NFS Client: %s\n", buf); 5781 ++count; 5782 } 5783 spin_unlock(&nn->client_lock); 5784 5785 return count; 5786 } 5787 5788 u64 5789 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size) 5790 { 5791 u64 count = 0; 5792 struct nfs4_client *clp; 5793 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5794 nfsd_net_id); 5795 5796 if (!nfsd_netns_ready(nn)) 5797 return count; 5798 5799 spin_lock(&nn->client_lock); 5800 clp = nfsd_find_client(addr, addr_size); 5801 if (clp) { 5802 if (mark_client_expired_locked(clp) == nfs_ok) 5803 ++count; 5804 else 5805 clp = NULL; 5806 } 5807 spin_unlock(&nn->client_lock); 5808 5809 if (clp) 5810 expire_client(clp); 5811 5812 return count; 5813 } 5814 5815 u64 5816 nfsd_inject_forget_clients(u64 max) 5817 { 5818 u64 count = 0; 5819 struct nfs4_client *clp, *next; 5820 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5821 nfsd_net_id); 5822 LIST_HEAD(reaplist); 5823 5824 if (!nfsd_netns_ready(nn)) 5825 return count; 5826 5827 spin_lock(&nn->client_lock); 5828 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) { 5829 if (mark_client_expired_locked(clp) == nfs_ok) { 5830 list_add(&clp->cl_lru, &reaplist); 5831 if (max != 0 && ++count >= max) 5832 break; 5833 } 5834 } 5835 spin_unlock(&nn->client_lock); 5836 5837 list_for_each_entry_safe(clp, next, &reaplist, cl_lru) 5838 expire_client(clp); 5839 5840 return count; 5841 } 5842 5843 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count, 5844 const char *type) 5845 { 5846 char buf[INET6_ADDRSTRLEN]; 5847 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf)); 5848 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type); 5849 } 5850 5851 static void 5852 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst, 5853 struct list_head *collect) 5854 { 5855 struct nfs4_client *clp = lst->st_stid.sc_client; 5856 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5857 nfsd_net_id); 5858 5859 if (!collect) 5860 return; 5861 5862 lockdep_assert_held(&nn->client_lock); 5863 atomic_inc(&clp->cl_refcount); 5864 list_add(&lst->st_locks, collect); 5865 } 5866 5867 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, 5868 struct list_head *collect, 5869 void (*func)(struct nfs4_ol_stateid *)) 5870 { 5871 struct nfs4_openowner *oop; 5872 struct nfs4_ol_stateid *stp, *st_next; 5873 struct nfs4_ol_stateid *lst, *lst_next; 5874 u64 count = 0; 5875 5876 spin_lock(&clp->cl_lock); 5877 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) { 5878 list_for_each_entry_safe(stp, st_next, 5879 &oop->oo_owner.so_stateids, st_perstateowner) { 5880 list_for_each_entry_safe(lst, lst_next, 5881 &stp->st_locks, st_locks) { 5882 if (func) { 5883 func(lst); 5884 nfsd_inject_add_lock_to_list(lst, 5885 collect); 5886 } 5887 ++count; 5888 /* 5889 * Despite the fact that these functions deal 5890 * with 64-bit integers for "count", we must 5891 * ensure that it doesn't blow up the 5892 * clp->cl_refcount. Throw a warning if we 5893 * start to approach INT_MAX here. 5894 */ 5895 WARN_ON_ONCE(count == (INT_MAX / 2)); 5896 if (count == max) 5897 goto out; 5898 } 5899 } 5900 } 5901 out: 5902 spin_unlock(&clp->cl_lock); 5903 5904 return count; 5905 } 5906 5907 static u64 5908 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect, 5909 u64 max) 5910 { 5911 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid); 5912 } 5913 5914 static u64 5915 nfsd_print_client_locks(struct nfs4_client *clp) 5916 { 5917 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL); 5918 nfsd_print_count(clp, count, "locked files"); 5919 return count; 5920 } 5921 5922 u64 5923 nfsd_inject_print_locks(void) 5924 { 5925 struct nfs4_client *clp; 5926 u64 count = 0; 5927 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5928 nfsd_net_id); 5929 5930 if (!nfsd_netns_ready(nn)) 5931 return 0; 5932 5933 spin_lock(&nn->client_lock); 5934 list_for_each_entry(clp, &nn->client_lru, cl_lru) 5935 count += nfsd_print_client_locks(clp); 5936 spin_unlock(&nn->client_lock); 5937 5938 return count; 5939 } 5940 5941 static void 5942 nfsd_reap_locks(struct list_head *reaplist) 5943 { 5944 struct nfs4_client *clp; 5945 struct nfs4_ol_stateid *stp, *next; 5946 5947 list_for_each_entry_safe(stp, next, reaplist, st_locks) { 5948 list_del_init(&stp->st_locks); 5949 clp = stp->st_stid.sc_client; 5950 nfs4_put_stid(&stp->st_stid); 5951 put_client(clp); 5952 } 5953 } 5954 5955 u64 5956 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size) 5957 { 5958 unsigned int count = 0; 5959 struct nfs4_client *clp; 5960 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5961 nfsd_net_id); 5962 LIST_HEAD(reaplist); 5963 5964 if (!nfsd_netns_ready(nn)) 5965 return count; 5966 5967 spin_lock(&nn->client_lock); 5968 clp = nfsd_find_client(addr, addr_size); 5969 if (clp) 5970 count = nfsd_collect_client_locks(clp, &reaplist, 0); 5971 spin_unlock(&nn->client_lock); 5972 nfsd_reap_locks(&reaplist); 5973 return count; 5974 } 5975 5976 u64 5977 nfsd_inject_forget_locks(u64 max) 5978 { 5979 u64 count = 0; 5980 struct nfs4_client *clp; 5981 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 5982 nfsd_net_id); 5983 LIST_HEAD(reaplist); 5984 5985 if (!nfsd_netns_ready(nn)) 5986 return count; 5987 5988 spin_lock(&nn->client_lock); 5989 list_for_each_entry(clp, &nn->client_lru, cl_lru) { 5990 count += nfsd_collect_client_locks(clp, &reaplist, max - count); 5991 if (max != 0 && count >= max) 5992 break; 5993 } 5994 spin_unlock(&nn->client_lock); 5995 nfsd_reap_locks(&reaplist); 5996 return count; 5997 } 5998 5999 static u64 6000 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max, 6001 struct list_head *collect, 6002 void (*func)(struct nfs4_openowner *)) 6003 { 6004 struct nfs4_openowner *oop, *next; 6005 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6006 nfsd_net_id); 6007 u64 count = 0; 6008 6009 lockdep_assert_held(&nn->client_lock); 6010 6011 spin_lock(&clp->cl_lock); 6012 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) { 6013 if (func) { 6014 func(oop); 6015 if (collect) { 6016 atomic_inc(&clp->cl_refcount); 6017 list_add(&oop->oo_perclient, collect); 6018 } 6019 } 6020 ++count; 6021 /* 6022 * Despite the fact that these functions deal with 6023 * 64-bit integers for "count", we must ensure that 6024 * it doesn't blow up the clp->cl_refcount. Throw a 6025 * warning if we start to approach INT_MAX here. 6026 */ 6027 WARN_ON_ONCE(count == (INT_MAX / 2)); 6028 if (count == max) 6029 break; 6030 } 6031 spin_unlock(&clp->cl_lock); 6032 6033 return count; 6034 } 6035 6036 static u64 6037 nfsd_print_client_openowners(struct nfs4_client *clp) 6038 { 6039 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL); 6040 6041 nfsd_print_count(clp, count, "openowners"); 6042 return count; 6043 } 6044 6045 static u64 6046 nfsd_collect_client_openowners(struct nfs4_client *clp, 6047 struct list_head *collect, u64 max) 6048 { 6049 return nfsd_foreach_client_openowner(clp, max, collect, 6050 unhash_openowner_locked); 6051 } 6052 6053 u64 6054 nfsd_inject_print_openowners(void) 6055 { 6056 struct nfs4_client *clp; 6057 u64 count = 0; 6058 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6059 nfsd_net_id); 6060 6061 if (!nfsd_netns_ready(nn)) 6062 return 0; 6063 6064 spin_lock(&nn->client_lock); 6065 list_for_each_entry(clp, &nn->client_lru, cl_lru) 6066 count += nfsd_print_client_openowners(clp); 6067 spin_unlock(&nn->client_lock); 6068 6069 return count; 6070 } 6071 6072 static void 6073 nfsd_reap_openowners(struct list_head *reaplist) 6074 { 6075 struct nfs4_client *clp; 6076 struct nfs4_openowner *oop, *next; 6077 6078 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) { 6079 list_del_init(&oop->oo_perclient); 6080 clp = oop->oo_owner.so_client; 6081 release_openowner(oop); 6082 put_client(clp); 6083 } 6084 } 6085 6086 u64 6087 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr, 6088 size_t addr_size) 6089 { 6090 unsigned int count = 0; 6091 struct nfs4_client *clp; 6092 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6093 nfsd_net_id); 6094 LIST_HEAD(reaplist); 6095 6096 if (!nfsd_netns_ready(nn)) 6097 return count; 6098 6099 spin_lock(&nn->client_lock); 6100 clp = nfsd_find_client(addr, addr_size); 6101 if (clp) 6102 count = nfsd_collect_client_openowners(clp, &reaplist, 0); 6103 spin_unlock(&nn->client_lock); 6104 nfsd_reap_openowners(&reaplist); 6105 return count; 6106 } 6107 6108 u64 6109 nfsd_inject_forget_openowners(u64 max) 6110 { 6111 u64 count = 0; 6112 struct nfs4_client *clp; 6113 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6114 nfsd_net_id); 6115 LIST_HEAD(reaplist); 6116 6117 if (!nfsd_netns_ready(nn)) 6118 return count; 6119 6120 spin_lock(&nn->client_lock); 6121 list_for_each_entry(clp, &nn->client_lru, cl_lru) { 6122 count += nfsd_collect_client_openowners(clp, &reaplist, 6123 max - count); 6124 if (max != 0 && count >= max) 6125 break; 6126 } 6127 spin_unlock(&nn->client_lock); 6128 nfsd_reap_openowners(&reaplist); 6129 return count; 6130 } 6131 6132 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max, 6133 struct list_head *victims) 6134 { 6135 struct nfs4_delegation *dp, *next; 6136 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6137 nfsd_net_id); 6138 u64 count = 0; 6139 6140 lockdep_assert_held(&nn->client_lock); 6141 6142 spin_lock(&state_lock); 6143 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) { 6144 if (victims) { 6145 /* 6146 * It's not safe to mess with delegations that have a 6147 * non-zero dl_time. They might have already been broken 6148 * and could be processed by the laundromat outside of 6149 * the state_lock. Just leave them be. 6150 */ 6151 if (dp->dl_time != 0) 6152 continue; 6153 6154 atomic_inc(&clp->cl_refcount); 6155 unhash_delegation_locked(dp); 6156 list_add(&dp->dl_recall_lru, victims); 6157 } 6158 ++count; 6159 /* 6160 * Despite the fact that these functions deal with 6161 * 64-bit integers for "count", we must ensure that 6162 * it doesn't blow up the clp->cl_refcount. Throw a 6163 * warning if we start to approach INT_MAX here. 6164 */ 6165 WARN_ON_ONCE(count == (INT_MAX / 2)); 6166 if (count == max) 6167 break; 6168 } 6169 spin_unlock(&state_lock); 6170 return count; 6171 } 6172 6173 static u64 6174 nfsd_print_client_delegations(struct nfs4_client *clp) 6175 { 6176 u64 count = nfsd_find_all_delegations(clp, 0, NULL); 6177 6178 nfsd_print_count(clp, count, "delegations"); 6179 return count; 6180 } 6181 6182 u64 6183 nfsd_inject_print_delegations(void) 6184 { 6185 struct nfs4_client *clp; 6186 u64 count = 0; 6187 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6188 nfsd_net_id); 6189 6190 if (!nfsd_netns_ready(nn)) 6191 return 0; 6192 6193 spin_lock(&nn->client_lock); 6194 list_for_each_entry(clp, &nn->client_lru, cl_lru) 6195 count += nfsd_print_client_delegations(clp); 6196 spin_unlock(&nn->client_lock); 6197 6198 return count; 6199 } 6200 6201 static void 6202 nfsd_forget_delegations(struct list_head *reaplist) 6203 { 6204 struct nfs4_client *clp; 6205 struct nfs4_delegation *dp, *next; 6206 6207 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) { 6208 list_del_init(&dp->dl_recall_lru); 6209 clp = dp->dl_stid.sc_client; 6210 revoke_delegation(dp); 6211 put_client(clp); 6212 } 6213 } 6214 6215 u64 6216 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr, 6217 size_t addr_size) 6218 { 6219 u64 count = 0; 6220 struct nfs4_client *clp; 6221 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6222 nfsd_net_id); 6223 LIST_HEAD(reaplist); 6224 6225 if (!nfsd_netns_ready(nn)) 6226 return count; 6227 6228 spin_lock(&nn->client_lock); 6229 clp = nfsd_find_client(addr, addr_size); 6230 if (clp) 6231 count = nfsd_find_all_delegations(clp, 0, &reaplist); 6232 spin_unlock(&nn->client_lock); 6233 6234 nfsd_forget_delegations(&reaplist); 6235 return count; 6236 } 6237 6238 u64 6239 nfsd_inject_forget_delegations(u64 max) 6240 { 6241 u64 count = 0; 6242 struct nfs4_client *clp; 6243 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6244 nfsd_net_id); 6245 LIST_HEAD(reaplist); 6246 6247 if (!nfsd_netns_ready(nn)) 6248 return count; 6249 6250 spin_lock(&nn->client_lock); 6251 list_for_each_entry(clp, &nn->client_lru, cl_lru) { 6252 count += nfsd_find_all_delegations(clp, max - count, &reaplist); 6253 if (max != 0 && count >= max) 6254 break; 6255 } 6256 spin_unlock(&nn->client_lock); 6257 nfsd_forget_delegations(&reaplist); 6258 return count; 6259 } 6260 6261 static void 6262 nfsd_recall_delegations(struct list_head *reaplist) 6263 { 6264 struct nfs4_client *clp; 6265 struct nfs4_delegation *dp, *next; 6266 6267 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) { 6268 list_del_init(&dp->dl_recall_lru); 6269 clp = dp->dl_stid.sc_client; 6270 /* 6271 * We skipped all entries that had a zero dl_time before, 6272 * so we can now reset the dl_time back to 0. If a delegation 6273 * break comes in now, then it won't make any difference since 6274 * we're recalling it either way. 6275 */ 6276 spin_lock(&state_lock); 6277 dp->dl_time = 0; 6278 spin_unlock(&state_lock); 6279 nfsd_break_one_deleg(dp); 6280 put_client(clp); 6281 } 6282 } 6283 6284 u64 6285 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr, 6286 size_t addr_size) 6287 { 6288 u64 count = 0; 6289 struct nfs4_client *clp; 6290 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6291 nfsd_net_id); 6292 LIST_HEAD(reaplist); 6293 6294 if (!nfsd_netns_ready(nn)) 6295 return count; 6296 6297 spin_lock(&nn->client_lock); 6298 clp = nfsd_find_client(addr, addr_size); 6299 if (clp) 6300 count = nfsd_find_all_delegations(clp, 0, &reaplist); 6301 spin_unlock(&nn->client_lock); 6302 6303 nfsd_recall_delegations(&reaplist); 6304 return count; 6305 } 6306 6307 u64 6308 nfsd_inject_recall_delegations(u64 max) 6309 { 6310 u64 count = 0; 6311 struct nfs4_client *clp, *next; 6312 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 6313 nfsd_net_id); 6314 LIST_HEAD(reaplist); 6315 6316 if (!nfsd_netns_ready(nn)) 6317 return count; 6318 6319 spin_lock(&nn->client_lock); 6320 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) { 6321 count += nfsd_find_all_delegations(clp, max - count, &reaplist); 6322 if (max != 0 && ++count >= max) 6323 break; 6324 } 6325 spin_unlock(&nn->client_lock); 6326 nfsd_recall_delegations(&reaplist); 6327 return count; 6328 } 6329 #endif /* CONFIG_NFSD_FAULT_INJECTION */ 6330 6331 /* 6332 * Since the lifetime of a delegation isn't limited to that of an open, a 6333 * client may quite reasonably hang on to a delegation as long as it has 6334 * the inode cached. This becomes an obvious problem the first time a 6335 * client's inode cache approaches the size of the server's total memory. 6336 * 6337 * For now we avoid this problem by imposing a hard limit on the number 6338 * of delegations, which varies according to the server's memory size. 6339 */ 6340 static void 6341 set_max_delegations(void) 6342 { 6343 /* 6344 * Allow at most 4 delegations per megabyte of RAM. Quick 6345 * estimates suggest that in the worst case (where every delegation 6346 * is for a different inode), a delegation could take about 1.5K, 6347 * giving a worst case usage of about 6% of memory. 6348 */ 6349 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); 6350 } 6351 6352 static int nfs4_state_create_net(struct net *net) 6353 { 6354 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 6355 int i; 6356 6357 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) * 6358 CLIENT_HASH_SIZE, GFP_KERNEL); 6359 if (!nn->conf_id_hashtbl) 6360 goto err; 6361 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) * 6362 CLIENT_HASH_SIZE, GFP_KERNEL); 6363 if (!nn->unconf_id_hashtbl) 6364 goto err_unconf_id; 6365 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) * 6366 SESSION_HASH_SIZE, GFP_KERNEL); 6367 if (!nn->sessionid_hashtbl) 6368 goto err_sessionid; 6369 6370 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 6371 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]); 6372 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]); 6373 } 6374 for (i = 0; i < SESSION_HASH_SIZE; i++) 6375 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]); 6376 nn->conf_name_tree = RB_ROOT; 6377 nn->unconf_name_tree = RB_ROOT; 6378 INIT_LIST_HEAD(&nn->client_lru); 6379 INIT_LIST_HEAD(&nn->close_lru); 6380 INIT_LIST_HEAD(&nn->del_recall_lru); 6381 spin_lock_init(&nn->client_lock); 6382 6383 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main); 6384 get_net(net); 6385 6386 return 0; 6387 6388 err_sessionid: 6389 kfree(nn->unconf_id_hashtbl); 6390 err_unconf_id: 6391 kfree(nn->conf_id_hashtbl); 6392 err: 6393 return -ENOMEM; 6394 } 6395 6396 static void 6397 nfs4_state_destroy_net(struct net *net) 6398 { 6399 int i; 6400 struct nfs4_client *clp = NULL; 6401 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 6402 6403 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 6404 while (!list_empty(&nn->conf_id_hashtbl[i])) { 6405 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 6406 destroy_client(clp); 6407 } 6408 } 6409 6410 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 6411 while (!list_empty(&nn->unconf_id_hashtbl[i])) { 6412 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 6413 destroy_client(clp); 6414 } 6415 } 6416 6417 kfree(nn->sessionid_hashtbl); 6418 kfree(nn->unconf_id_hashtbl); 6419 kfree(nn->conf_id_hashtbl); 6420 put_net(net); 6421 } 6422 6423 int 6424 nfs4_state_start_net(struct net *net) 6425 { 6426 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 6427 int ret; 6428 6429 ret = nfs4_state_create_net(net); 6430 if (ret) 6431 return ret; 6432 nn->boot_time = get_seconds(); 6433 nn->grace_ended = false; 6434 locks_start_grace(net, &nn->nfsd4_manager); 6435 nfsd4_client_tracking_init(net); 6436 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n", 6437 nn->nfsd4_grace, net); 6438 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ); 6439 return 0; 6440 } 6441 6442 /* initialization to perform when the nfsd service is started: */ 6443 6444 int 6445 nfs4_state_start(void) 6446 { 6447 int ret; 6448 6449 ret = set_callback_cred(); 6450 if (ret) 6451 return -ENOMEM; 6452 laundry_wq = create_singlethread_workqueue("nfsd4"); 6453 if (laundry_wq == NULL) { 6454 ret = -ENOMEM; 6455 goto out_recovery; 6456 } 6457 ret = nfsd4_create_callback_queue(); 6458 if (ret) 6459 goto out_free_laundry; 6460 6461 set_max_delegations(); 6462 6463 return 0; 6464 6465 out_free_laundry: 6466 destroy_workqueue(laundry_wq); 6467 out_recovery: 6468 return ret; 6469 } 6470 6471 void 6472 nfs4_state_shutdown_net(struct net *net) 6473 { 6474 struct nfs4_delegation *dp = NULL; 6475 struct list_head *pos, *next, reaplist; 6476 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 6477 6478 cancel_delayed_work_sync(&nn->laundromat_work); 6479 locks_end_grace(&nn->nfsd4_manager); 6480 6481 INIT_LIST_HEAD(&reaplist); 6482 spin_lock(&state_lock); 6483 list_for_each_safe(pos, next, &nn->del_recall_lru) { 6484 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 6485 unhash_delegation_locked(dp); 6486 list_add(&dp->dl_recall_lru, &reaplist); 6487 } 6488 spin_unlock(&state_lock); 6489 list_for_each_safe(pos, next, &reaplist) { 6490 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 6491 list_del_init(&dp->dl_recall_lru); 6492 nfs4_put_deleg_lease(dp->dl_stid.sc_file); 6493 nfs4_put_stid(&dp->dl_stid); 6494 } 6495 6496 nfsd4_client_tracking_exit(net); 6497 nfs4_state_destroy_net(net); 6498 } 6499 6500 void 6501 nfs4_state_shutdown(void) 6502 { 6503 destroy_workqueue(laundry_wq); 6504 nfsd4_destroy_callback_queue(); 6505 } 6506 6507 static void 6508 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) 6509 { 6510 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid)) 6511 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t)); 6512 } 6513 6514 static void 6515 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) 6516 { 6517 if (cstate->minorversion) { 6518 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t)); 6519 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); 6520 } 6521 } 6522 6523 void 6524 clear_current_stateid(struct nfsd4_compound_state *cstate) 6525 { 6526 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); 6527 } 6528 6529 /* 6530 * functions to set current state id 6531 */ 6532 void 6533 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp) 6534 { 6535 put_stateid(cstate, &odp->od_stateid); 6536 } 6537 6538 void 6539 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open) 6540 { 6541 put_stateid(cstate, &open->op_stateid); 6542 } 6543 6544 void 6545 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close) 6546 { 6547 put_stateid(cstate, &close->cl_stateid); 6548 } 6549 6550 void 6551 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock) 6552 { 6553 put_stateid(cstate, &lock->lk_resp_stateid); 6554 } 6555 6556 /* 6557 * functions to consume current state id 6558 */ 6559 6560 void 6561 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp) 6562 { 6563 get_stateid(cstate, &odp->od_stateid); 6564 } 6565 6566 void 6567 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp) 6568 { 6569 get_stateid(cstate, &drp->dr_stateid); 6570 } 6571 6572 void 6573 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp) 6574 { 6575 get_stateid(cstate, &fsp->fr_stateid); 6576 } 6577 6578 void 6579 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr) 6580 { 6581 get_stateid(cstate, &setattr->sa_stateid); 6582 } 6583 6584 void 6585 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close) 6586 { 6587 get_stateid(cstate, &close->cl_stateid); 6588 } 6589 6590 void 6591 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku) 6592 { 6593 get_stateid(cstate, &locku->lu_stateid); 6594 } 6595 6596 void 6597 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read) 6598 { 6599 get_stateid(cstate, &read->rd_stateid); 6600 } 6601 6602 void 6603 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write) 6604 { 6605 get_stateid(cstate, &write->wr_stateid); 6606 } 6607