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/sunrpc/svcauth_gss.h> 41 #include <linux/sunrpc/clnt.h> 42 #include "xdr4.h" 43 #include "vfs.h" 44 45 #define NFSDDBG_FACILITY NFSDDBG_PROC 46 47 /* Globals */ 48 time_t nfsd4_lease = 90; /* default lease time */ 49 time_t nfsd4_grace = 90; 50 static time_t boot_time; 51 static u32 current_ownerid = 1; 52 static u32 current_fileid = 1; 53 static u32 current_delegid = 1; 54 static stateid_t zerostateid; /* bits all 0 */ 55 static stateid_t onestateid; /* bits all 1 */ 56 static u64 current_sessionid = 1; 57 58 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t))) 59 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t))) 60 61 /* forward declarations */ 62 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); 63 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); 64 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; 65 static void nfs4_set_recdir(char *recdir); 66 67 /* Locking: */ 68 69 /* Currently used for almost all code touching nfsv4 state: */ 70 static DEFINE_MUTEX(client_mutex); 71 72 /* 73 * Currently used for the del_recall_lru and file hash table. In an 74 * effort to decrease the scope of the client_mutex, this spinlock may 75 * eventually cover more: 76 */ 77 static DEFINE_SPINLOCK(recall_lock); 78 79 static struct kmem_cache *stateowner_slab = NULL; 80 static struct kmem_cache *file_slab = NULL; 81 static struct kmem_cache *stateid_slab = NULL; 82 static struct kmem_cache *deleg_slab = NULL; 83 84 void 85 nfs4_lock_state(void) 86 { 87 mutex_lock(&client_mutex); 88 } 89 90 void 91 nfs4_unlock_state(void) 92 { 93 mutex_unlock(&client_mutex); 94 } 95 96 static inline u32 97 opaque_hashval(const void *ptr, int nbytes) 98 { 99 unsigned char *cptr = (unsigned char *) ptr; 100 101 u32 x = 0; 102 while (nbytes--) { 103 x *= 37; 104 x += *cptr++; 105 } 106 return x; 107 } 108 109 static struct list_head del_recall_lru; 110 111 static inline void 112 put_nfs4_file(struct nfs4_file *fi) 113 { 114 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { 115 list_del(&fi->fi_hash); 116 spin_unlock(&recall_lock); 117 iput(fi->fi_inode); 118 kmem_cache_free(file_slab, fi); 119 } 120 } 121 122 static inline void 123 get_nfs4_file(struct nfs4_file *fi) 124 { 125 atomic_inc(&fi->fi_ref); 126 } 127 128 static int num_delegations; 129 unsigned int max_delegations; 130 131 /* 132 * Open owner state (share locks) 133 */ 134 135 /* hash tables for nfs4_stateowner */ 136 #define OWNER_HASH_BITS 8 137 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) 138 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) 139 140 #define ownerid_hashval(id) \ 141 ((id) & OWNER_HASH_MASK) 142 #define ownerstr_hashval(clientid, ownername) \ 143 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) 144 145 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; 146 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; 147 148 /* hash table for nfs4_file */ 149 #define FILE_HASH_BITS 8 150 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) 151 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) 152 /* hash table for (open)nfs4_stateid */ 153 #define STATEID_HASH_BITS 10 154 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) 155 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) 156 157 #define file_hashval(x) \ 158 hash_ptr(x, FILE_HASH_BITS) 159 #define stateid_hashval(owner_id, file_id) \ 160 (((owner_id) + (file_id)) & STATEID_HASH_MASK) 161 162 static struct list_head file_hashtbl[FILE_HASH_SIZE]; 163 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; 164 165 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag) 166 { 167 BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR])); 168 atomic_inc(&fp->fi_access[oflag]); 169 } 170 171 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag) 172 { 173 if (oflag == O_RDWR) { 174 __nfs4_file_get_access(fp, O_RDONLY); 175 __nfs4_file_get_access(fp, O_WRONLY); 176 } else 177 __nfs4_file_get_access(fp, oflag); 178 } 179 180 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag) 181 { 182 if (fp->fi_fds[oflag]) { 183 fput(fp->fi_fds[oflag]); 184 fp->fi_fds[oflag] = NULL; 185 } 186 } 187 188 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) 189 { 190 if (atomic_dec_and_test(&fp->fi_access[oflag])) { 191 nfs4_file_put_fd(fp, O_RDWR); 192 nfs4_file_put_fd(fp, oflag); 193 } 194 } 195 196 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag) 197 { 198 if (oflag == O_RDWR) { 199 __nfs4_file_put_access(fp, O_RDONLY); 200 __nfs4_file_put_access(fp, O_WRONLY); 201 } else 202 __nfs4_file_put_access(fp, oflag); 203 } 204 205 static struct nfs4_delegation * 206 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) 207 { 208 struct nfs4_delegation *dp; 209 struct nfs4_file *fp = stp->st_file; 210 211 dprintk("NFSD alloc_init_deleg\n"); 212 /* 213 * Major work on the lease subsystem (for example, to support 214 * calbacks on stat) will be required before we can support 215 * write delegations properly. 216 */ 217 if (type != NFS4_OPEN_DELEGATE_READ) 218 return NULL; 219 if (fp->fi_had_conflict) 220 return NULL; 221 if (num_delegations > max_delegations) 222 return NULL; 223 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); 224 if (dp == NULL) 225 return dp; 226 num_delegations++; 227 INIT_LIST_HEAD(&dp->dl_perfile); 228 INIT_LIST_HEAD(&dp->dl_perclnt); 229 INIT_LIST_HEAD(&dp->dl_recall_lru); 230 dp->dl_client = clp; 231 get_nfs4_file(fp); 232 dp->dl_file = fp; 233 nfs4_file_get_access(fp, O_RDONLY); 234 dp->dl_flock = NULL; 235 dp->dl_type = type; 236 dp->dl_stateid.si_boot = boot_time; 237 dp->dl_stateid.si_stateownerid = current_delegid++; 238 dp->dl_stateid.si_fileid = 0; 239 dp->dl_stateid.si_generation = 0; 240 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle); 241 dp->dl_time = 0; 242 atomic_set(&dp->dl_count, 1); 243 list_add(&dp->dl_perfile, &fp->fi_delegations); 244 list_add(&dp->dl_perclnt, &clp->cl_delegations); 245 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc); 246 return dp; 247 } 248 249 void 250 nfs4_put_delegation(struct nfs4_delegation *dp) 251 { 252 if (atomic_dec_and_test(&dp->dl_count)) { 253 dprintk("NFSD: freeing dp %p\n",dp); 254 put_nfs4_file(dp->dl_file); 255 kmem_cache_free(deleg_slab, dp); 256 num_delegations--; 257 } 258 } 259 260 /* Remove the associated file_lock first, then remove the delegation. 261 * lease_modify() is called to remove the FS_LEASE file_lock from 262 * the i_flock list, eventually calling nfsd's lock_manager 263 * fl_release_callback. 264 */ 265 static void 266 nfs4_close_delegation(struct nfs4_delegation *dp) 267 { 268 struct file *filp = find_readable_file(dp->dl_file); 269 270 dprintk("NFSD: close_delegation dp %p\n",dp); 271 if (dp->dl_flock) 272 vfs_setlease(filp, F_UNLCK, &dp->dl_flock); 273 nfs4_file_put_access(dp->dl_file, O_RDONLY); 274 } 275 276 /* Called under the state lock. */ 277 static void 278 unhash_delegation(struct nfs4_delegation *dp) 279 { 280 list_del_init(&dp->dl_perfile); 281 list_del_init(&dp->dl_perclnt); 282 spin_lock(&recall_lock); 283 list_del_init(&dp->dl_recall_lru); 284 spin_unlock(&recall_lock); 285 nfs4_close_delegation(dp); 286 nfs4_put_delegation(dp); 287 } 288 289 /* 290 * SETCLIENTID state 291 */ 292 293 /* client_lock protects the client lru list and session hash table */ 294 static DEFINE_SPINLOCK(client_lock); 295 296 /* Hash tables for nfs4_clientid state */ 297 #define CLIENT_HASH_BITS 4 298 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 299 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 300 301 #define clientid_hashval(id) \ 302 ((id) & CLIENT_HASH_MASK) 303 #define clientstr_hashval(name) \ 304 (opaque_hashval((name), 8) & CLIENT_HASH_MASK) 305 /* 306 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 307 * used in reboot/reset lease grace period processing 308 * 309 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed 310 * setclientid_confirmed info. 311 * 312 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 313 * setclientid info. 314 * 315 * client_lru holds client queue ordered by nfs4_client.cl_time 316 * for lease renewal. 317 * 318 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 319 * for last close replay. 320 */ 321 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; 322 static int reclaim_str_hashtbl_size = 0; 323 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; 324 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; 325 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; 326 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; 327 static struct list_head client_lru; 328 static struct list_head close_lru; 329 330 static void unhash_generic_stateid(struct nfs4_stateid *stp) 331 { 332 list_del(&stp->st_hash); 333 list_del(&stp->st_perfile); 334 list_del(&stp->st_perstateowner); 335 } 336 337 static void free_generic_stateid(struct nfs4_stateid *stp) 338 { 339 put_nfs4_file(stp->st_file); 340 kmem_cache_free(stateid_slab, stp); 341 } 342 343 static void release_lock_stateid(struct nfs4_stateid *stp) 344 { 345 struct file *file; 346 347 unhash_generic_stateid(stp); 348 file = find_any_file(stp->st_file); 349 if (file) 350 locks_remove_posix(file, (fl_owner_t)stp->st_stateowner); 351 free_generic_stateid(stp); 352 } 353 354 static void unhash_lockowner(struct nfs4_stateowner *sop) 355 { 356 struct nfs4_stateid *stp; 357 358 list_del(&sop->so_idhash); 359 list_del(&sop->so_strhash); 360 list_del(&sop->so_perstateid); 361 while (!list_empty(&sop->so_stateids)) { 362 stp = list_first_entry(&sop->so_stateids, 363 struct nfs4_stateid, st_perstateowner); 364 release_lock_stateid(stp); 365 } 366 } 367 368 static void release_lockowner(struct nfs4_stateowner *sop) 369 { 370 unhash_lockowner(sop); 371 nfs4_put_stateowner(sop); 372 } 373 374 static void 375 release_stateid_lockowners(struct nfs4_stateid *open_stp) 376 { 377 struct nfs4_stateowner *lock_sop; 378 379 while (!list_empty(&open_stp->st_lockowners)) { 380 lock_sop = list_entry(open_stp->st_lockowners.next, 381 struct nfs4_stateowner, so_perstateid); 382 /* list_del(&open_stp->st_lockowners); */ 383 BUG_ON(lock_sop->so_is_open_owner); 384 release_lockowner(lock_sop); 385 } 386 } 387 388 /* 389 * We store the NONE, READ, WRITE, and BOTH bits separately in the 390 * st_{access,deny}_bmap field of the stateid, in order to track not 391 * only what share bits are currently in force, but also what 392 * combinations of share bits previous opens have used. This allows us 393 * to enforce the recommendation of rfc 3530 14.2.19 that the server 394 * return an error if the client attempt to downgrade to a combination 395 * of share bits not explicable by closing some of its previous opens. 396 * 397 * XXX: This enforcement is actually incomplete, since we don't keep 398 * track of access/deny bit combinations; so, e.g., we allow: 399 * 400 * OPEN allow read, deny write 401 * OPEN allow both, deny none 402 * DOWNGRADE allow read, deny none 403 * 404 * which we should reject. 405 */ 406 static void 407 set_access(unsigned int *access, unsigned long bmap) { 408 int i; 409 410 *access = 0; 411 for (i = 1; i < 4; i++) { 412 if (test_bit(i, &bmap)) 413 *access |= i; 414 } 415 } 416 417 static void 418 set_deny(unsigned int *deny, unsigned long bmap) { 419 int i; 420 421 *deny = 0; 422 for (i = 0; i < 4; i++) { 423 if (test_bit(i, &bmap)) 424 *deny |= i ; 425 } 426 } 427 428 static int 429 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { 430 unsigned int access, deny; 431 432 set_access(&access, stp->st_access_bmap); 433 set_deny(&deny, stp->st_deny_bmap); 434 if ((access & open->op_share_deny) || (deny & open->op_share_access)) 435 return 0; 436 return 1; 437 } 438 439 static int nfs4_access_to_omode(u32 access) 440 { 441 switch (access & NFS4_SHARE_ACCESS_BOTH) { 442 case NFS4_SHARE_ACCESS_READ: 443 return O_RDONLY; 444 case NFS4_SHARE_ACCESS_WRITE: 445 return O_WRONLY; 446 case NFS4_SHARE_ACCESS_BOTH: 447 return O_RDWR; 448 } 449 BUG(); 450 } 451 452 static int nfs4_access_bmap_to_omode(struct nfs4_stateid *stp) 453 { 454 unsigned int access; 455 456 set_access(&access, stp->st_access_bmap); 457 return nfs4_access_to_omode(access); 458 } 459 460 static void release_open_stateid(struct nfs4_stateid *stp) 461 { 462 int oflag = nfs4_access_bmap_to_omode(stp); 463 464 unhash_generic_stateid(stp); 465 release_stateid_lockowners(stp); 466 nfs4_file_put_access(stp->st_file, oflag); 467 free_generic_stateid(stp); 468 } 469 470 static void unhash_openowner(struct nfs4_stateowner *sop) 471 { 472 struct nfs4_stateid *stp; 473 474 list_del(&sop->so_idhash); 475 list_del(&sop->so_strhash); 476 list_del(&sop->so_perclient); 477 list_del(&sop->so_perstateid); /* XXX: necessary? */ 478 while (!list_empty(&sop->so_stateids)) { 479 stp = list_first_entry(&sop->so_stateids, 480 struct nfs4_stateid, st_perstateowner); 481 release_open_stateid(stp); 482 } 483 } 484 485 static void release_openowner(struct nfs4_stateowner *sop) 486 { 487 unhash_openowner(sop); 488 list_del(&sop->so_close_lru); 489 nfs4_put_stateowner(sop); 490 } 491 492 #define SESSION_HASH_SIZE 512 493 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE]; 494 495 static inline int 496 hash_sessionid(struct nfs4_sessionid *sessionid) 497 { 498 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; 499 500 return sid->sequence % SESSION_HASH_SIZE; 501 } 502 503 static inline void 504 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) 505 { 506 u32 *ptr = (u32 *)(&sessionid->data[0]); 507 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); 508 } 509 510 static void 511 gen_sessionid(struct nfsd4_session *ses) 512 { 513 struct nfs4_client *clp = ses->se_client; 514 struct nfsd4_sessionid *sid; 515 516 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; 517 sid->clientid = clp->cl_clientid; 518 sid->sequence = current_sessionid++; 519 sid->reserved = 0; 520 } 521 522 /* 523 * The protocol defines ca_maxresponssize_cached to include the size of 524 * the rpc header, but all we need to cache is the data starting after 525 * the end of the initial SEQUENCE operation--the rest we regenerate 526 * each time. Therefore we can advertise a ca_maxresponssize_cached 527 * value that is the number of bytes in our cache plus a few additional 528 * bytes. In order to stay on the safe side, and not promise more than 529 * we can cache, those additional bytes must be the minimum possible: 24 530 * bytes of rpc header (xid through accept state, with AUTH_NULL 531 * verifier), 12 for the compound header (with zero-length tag), and 44 532 * for the SEQUENCE op response: 533 */ 534 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) 535 536 static void 537 free_session_slots(struct nfsd4_session *ses) 538 { 539 int i; 540 541 for (i = 0; i < ses->se_fchannel.maxreqs; i++) 542 kfree(ses->se_slots[i]); 543 } 544 545 /* 546 * We don't actually need to cache the rpc and session headers, so we 547 * can allocate a little less for each slot: 548 */ 549 static inline int slot_bytes(struct nfsd4_channel_attrs *ca) 550 { 551 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; 552 } 553 554 static int nfsd4_sanitize_slot_size(u32 size) 555 { 556 size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */ 557 size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE); 558 559 return size; 560 } 561 562 /* 563 * XXX: If we run out of reserved DRC memory we could (up to a point) 564 * re-negotiate active sessions and reduce their slot usage to make 565 * rooom for new connections. For now we just fail the create session. 566 */ 567 static int nfsd4_get_drc_mem(int slotsize, u32 num) 568 { 569 int avail; 570 571 num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION); 572 573 spin_lock(&nfsd_drc_lock); 574 avail = min_t(int, NFSD_MAX_MEM_PER_SESSION, 575 nfsd_drc_max_mem - nfsd_drc_mem_used); 576 num = min_t(int, num, avail / slotsize); 577 nfsd_drc_mem_used += num * slotsize; 578 spin_unlock(&nfsd_drc_lock); 579 580 return num; 581 } 582 583 static void nfsd4_put_drc_mem(int slotsize, int num) 584 { 585 spin_lock(&nfsd_drc_lock); 586 nfsd_drc_mem_used -= slotsize * num; 587 spin_unlock(&nfsd_drc_lock); 588 } 589 590 static struct nfsd4_session *alloc_session(int slotsize, int numslots) 591 { 592 struct nfsd4_session *new; 593 int mem, i; 594 595 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *) 596 + sizeof(struct nfsd4_session) > PAGE_SIZE); 597 mem = numslots * sizeof(struct nfsd4_slot *); 598 599 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL); 600 if (!new) 601 return NULL; 602 /* allocate each struct nfsd4_slot and data cache in one piece */ 603 for (i = 0; i < numslots; i++) { 604 mem = sizeof(struct nfsd4_slot) + slotsize; 605 new->se_slots[i] = kzalloc(mem, GFP_KERNEL); 606 if (!new->se_slots[i]) 607 goto out_free; 608 } 609 return new; 610 out_free: 611 while (i--) 612 kfree(new->se_slots[i]); 613 kfree(new); 614 return NULL; 615 } 616 617 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize) 618 { 619 u32 maxrpc = nfsd_serv->sv_max_mesg; 620 621 new->maxreqs = numslots; 622 new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ; 623 new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc); 624 new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc); 625 new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND); 626 } 627 628 static void free_conn(struct nfsd4_conn *c) 629 { 630 svc_xprt_put(c->cn_xprt); 631 kfree(c); 632 } 633 634 static void nfsd4_conn_lost(struct svc_xpt_user *u) 635 { 636 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); 637 struct nfs4_client *clp = c->cn_session->se_client; 638 639 spin_lock(&clp->cl_lock); 640 if (!list_empty(&c->cn_persession)) { 641 list_del(&c->cn_persession); 642 free_conn(c); 643 } 644 spin_unlock(&clp->cl_lock); 645 } 646 647 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) 648 { 649 struct nfsd4_conn *conn; 650 651 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL); 652 if (!conn) 653 return NULL; 654 svc_xprt_get(rqstp->rq_xprt); 655 conn->cn_xprt = rqstp->rq_xprt; 656 conn->cn_flags = flags; 657 INIT_LIST_HEAD(&conn->cn_xpt_user.list); 658 return conn; 659 } 660 661 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) 662 { 663 conn->cn_session = ses; 664 list_add(&conn->cn_persession, &ses->se_conns); 665 } 666 667 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) 668 { 669 struct nfs4_client *clp = ses->se_client; 670 671 spin_lock(&clp->cl_lock); 672 __nfsd4_hash_conn(conn, ses); 673 spin_unlock(&clp->cl_lock); 674 } 675 676 static void nfsd4_register_conn(struct nfsd4_conn *conn) 677 { 678 conn->cn_xpt_user.callback = nfsd4_conn_lost; 679 register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); 680 } 681 682 static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses) 683 { 684 struct nfsd4_conn *conn; 685 u32 flags = NFS4_CDFC4_FORE; 686 687 if (ses->se_flags & SESSION4_BACK_CHAN) 688 flags |= NFS4_CDFC4_BACK; 689 conn = alloc_conn(rqstp, flags); 690 if (!conn) 691 return nfserr_jukebox; 692 nfsd4_hash_conn(conn, ses); 693 nfsd4_register_conn(conn); 694 return nfs_ok; 695 } 696 697 static void nfsd4_del_conns(struct nfsd4_session *s) 698 { 699 struct nfs4_client *clp = s->se_client; 700 struct nfsd4_conn *c; 701 702 spin_lock(&clp->cl_lock); 703 while (!list_empty(&s->se_conns)) { 704 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); 705 list_del_init(&c->cn_persession); 706 spin_unlock(&clp->cl_lock); 707 708 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); 709 free_conn(c); 710 711 spin_lock(&clp->cl_lock); 712 } 713 spin_unlock(&clp->cl_lock); 714 } 715 716 void free_session(struct kref *kref) 717 { 718 struct nfsd4_session *ses; 719 int mem; 720 721 ses = container_of(kref, struct nfsd4_session, se_ref); 722 nfsd4_del_conns(ses); 723 spin_lock(&nfsd_drc_lock); 724 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel); 725 nfsd_drc_mem_used -= mem; 726 spin_unlock(&nfsd_drc_lock); 727 free_session_slots(ses); 728 kfree(ses); 729 } 730 731 static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses) 732 { 733 struct nfsd4_session *new; 734 struct nfsd4_channel_attrs *fchan = &cses->fore_channel; 735 int numslots, slotsize; 736 int status; 737 int idx; 738 739 /* 740 * Note decreasing slot size below client's request may 741 * make it difficult for client to function correctly, whereas 742 * decreasing the number of slots will (just?) affect 743 * performance. When short on memory we therefore prefer to 744 * decrease number of slots instead of their size. 745 */ 746 slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached); 747 numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs); 748 749 new = alloc_session(slotsize, numslots); 750 if (!new) { 751 nfsd4_put_drc_mem(slotsize, fchan->maxreqs); 752 return NULL; 753 } 754 init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize); 755 756 new->se_client = clp; 757 gen_sessionid(new); 758 759 INIT_LIST_HEAD(&new->se_conns); 760 761 new->se_cb_seq_nr = 1; 762 new->se_flags = cses->flags; 763 new->se_cb_prog = cses->callback_prog; 764 kref_init(&new->se_ref); 765 idx = hash_sessionid(&new->se_sessionid); 766 spin_lock(&client_lock); 767 list_add(&new->se_hash, &sessionid_hashtbl[idx]); 768 list_add(&new->se_perclnt, &clp->cl_sessions); 769 spin_unlock(&client_lock); 770 771 status = nfsd4_new_conn(rqstp, new); 772 /* whoops: benny points out, status is ignored! (err, or bogus) */ 773 if (status) { 774 free_session(&new->se_ref); 775 return NULL; 776 } 777 if (!clp->cl_cb_session && (cses->flags & SESSION4_BACK_CHAN)) { 778 struct sockaddr *sa = svc_addr(rqstp); 779 780 clp->cl_cb_session = new; 781 clp->cl_cb_conn.cb_xprt = rqstp->rq_xprt; 782 svc_xprt_get(rqstp->rq_xprt); 783 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); 784 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); 785 nfsd4_probe_callback(clp); 786 } 787 return new; 788 } 789 790 /* caller must hold client_lock */ 791 static struct nfsd4_session * 792 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid) 793 { 794 struct nfsd4_session *elem; 795 int idx; 796 797 dump_sessionid(__func__, sessionid); 798 idx = hash_sessionid(sessionid); 799 /* Search in the appropriate list */ 800 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) { 801 if (!memcmp(elem->se_sessionid.data, sessionid->data, 802 NFS4_MAX_SESSIONID_LEN)) { 803 return elem; 804 } 805 } 806 807 dprintk("%s: session not found\n", __func__); 808 return NULL; 809 } 810 811 /* caller must hold client_lock */ 812 static void 813 unhash_session(struct nfsd4_session *ses) 814 { 815 list_del(&ses->se_hash); 816 list_del(&ses->se_perclnt); 817 } 818 819 /* must be called under the client_lock */ 820 static inline void 821 renew_client_locked(struct nfs4_client *clp) 822 { 823 if (is_client_expired(clp)) { 824 dprintk("%s: client (clientid %08x/%08x) already expired\n", 825 __func__, 826 clp->cl_clientid.cl_boot, 827 clp->cl_clientid.cl_id); 828 return; 829 } 830 831 /* 832 * Move client to the end to the LRU list. 833 */ 834 dprintk("renewing client (clientid %08x/%08x)\n", 835 clp->cl_clientid.cl_boot, 836 clp->cl_clientid.cl_id); 837 list_move_tail(&clp->cl_lru, &client_lru); 838 clp->cl_time = get_seconds(); 839 } 840 841 static inline void 842 renew_client(struct nfs4_client *clp) 843 { 844 spin_lock(&client_lock); 845 renew_client_locked(clp); 846 spin_unlock(&client_lock); 847 } 848 849 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ 850 static int 851 STALE_CLIENTID(clientid_t *clid) 852 { 853 if (clid->cl_boot == boot_time) 854 return 0; 855 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", 856 clid->cl_boot, clid->cl_id, boot_time); 857 return 1; 858 } 859 860 /* 861 * XXX Should we use a slab cache ? 862 * This type of memory management is somewhat inefficient, but we use it 863 * anyway since SETCLIENTID is not a common operation. 864 */ 865 static struct nfs4_client *alloc_client(struct xdr_netobj name) 866 { 867 struct nfs4_client *clp; 868 869 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); 870 if (clp == NULL) 871 return NULL; 872 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL); 873 if (clp->cl_name.data == NULL) { 874 kfree(clp); 875 return NULL; 876 } 877 memcpy(clp->cl_name.data, name.data, name.len); 878 clp->cl_name.len = name.len; 879 return clp; 880 } 881 882 static inline void 883 free_client(struct nfs4_client *clp) 884 { 885 while (!list_empty(&clp->cl_sessions)) { 886 struct nfsd4_session *ses; 887 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, 888 se_perclnt); 889 list_del(&ses->se_perclnt); 890 nfsd4_put_session(ses); 891 } 892 if (clp->cl_cred.cr_group_info) 893 put_group_info(clp->cl_cred.cr_group_info); 894 kfree(clp->cl_principal); 895 kfree(clp->cl_name.data); 896 kfree(clp); 897 } 898 899 void 900 release_session_client(struct nfsd4_session *session) 901 { 902 struct nfs4_client *clp = session->se_client; 903 904 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock)) 905 return; 906 if (is_client_expired(clp)) { 907 free_client(clp); 908 session->se_client = NULL; 909 } else 910 renew_client_locked(clp); 911 spin_unlock(&client_lock); 912 } 913 914 /* must be called under the client_lock */ 915 static inline void 916 unhash_client_locked(struct nfs4_client *clp) 917 { 918 struct nfsd4_session *ses; 919 920 mark_client_expired(clp); 921 list_del(&clp->cl_lru); 922 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) 923 list_del_init(&ses->se_hash); 924 } 925 926 static void 927 expire_client(struct nfs4_client *clp) 928 { 929 struct nfs4_stateowner *sop; 930 struct nfs4_delegation *dp; 931 struct list_head reaplist; 932 933 INIT_LIST_HEAD(&reaplist); 934 spin_lock(&recall_lock); 935 while (!list_empty(&clp->cl_delegations)) { 936 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); 937 dprintk("NFSD: expire client. dp %p, fp %p\n", dp, 938 dp->dl_flock); 939 list_del_init(&dp->dl_perclnt); 940 list_move(&dp->dl_recall_lru, &reaplist); 941 } 942 spin_unlock(&recall_lock); 943 while (!list_empty(&reaplist)) { 944 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); 945 list_del_init(&dp->dl_recall_lru); 946 unhash_delegation(dp); 947 } 948 while (!list_empty(&clp->cl_openowners)) { 949 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); 950 release_openowner(sop); 951 } 952 nfsd4_shutdown_callback(clp); 953 if (clp->cl_cb_conn.cb_xprt) 954 svc_xprt_put(clp->cl_cb_conn.cb_xprt); 955 list_del(&clp->cl_idhash); 956 list_del(&clp->cl_strhash); 957 spin_lock(&client_lock); 958 unhash_client_locked(clp); 959 if (atomic_read(&clp->cl_refcount) == 0) 960 free_client(clp); 961 spin_unlock(&client_lock); 962 } 963 964 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) 965 { 966 memcpy(target->cl_verifier.data, source->data, 967 sizeof(target->cl_verifier.data)); 968 } 969 970 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) 971 { 972 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 973 target->cl_clientid.cl_id = source->cl_clientid.cl_id; 974 } 975 976 static void copy_cred(struct svc_cred *target, struct svc_cred *source) 977 { 978 target->cr_uid = source->cr_uid; 979 target->cr_gid = source->cr_gid; 980 target->cr_group_info = source->cr_group_info; 981 get_group_info(target->cr_group_info); 982 } 983 984 static int same_name(const char *n1, const char *n2) 985 { 986 return 0 == memcmp(n1, n2, HEXDIR_LEN); 987 } 988 989 static int 990 same_verf(nfs4_verifier *v1, nfs4_verifier *v2) 991 { 992 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); 993 } 994 995 static int 996 same_clid(clientid_t *cl1, clientid_t *cl2) 997 { 998 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); 999 } 1000 1001 /* XXX what about NGROUP */ 1002 static int 1003 same_creds(struct svc_cred *cr1, struct svc_cred *cr2) 1004 { 1005 return cr1->cr_uid == cr2->cr_uid; 1006 } 1007 1008 static void gen_clid(struct nfs4_client *clp) 1009 { 1010 static u32 current_clientid = 1; 1011 1012 clp->cl_clientid.cl_boot = boot_time; 1013 clp->cl_clientid.cl_id = current_clientid++; 1014 } 1015 1016 static void gen_confirm(struct nfs4_client *clp) 1017 { 1018 static u32 i; 1019 u32 *p; 1020 1021 p = (u32 *)clp->cl_confirm.data; 1022 *p++ = get_seconds(); 1023 *p++ = i++; 1024 } 1025 1026 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir, 1027 struct svc_rqst *rqstp, nfs4_verifier *verf) 1028 { 1029 struct nfs4_client *clp; 1030 struct sockaddr *sa = svc_addr(rqstp); 1031 char *princ; 1032 1033 clp = alloc_client(name); 1034 if (clp == NULL) 1035 return NULL; 1036 1037 INIT_LIST_HEAD(&clp->cl_sessions); 1038 1039 princ = svc_gss_principal(rqstp); 1040 if (princ) { 1041 clp->cl_principal = kstrdup(princ, GFP_KERNEL); 1042 if (clp->cl_principal == NULL) { 1043 free_client(clp); 1044 return NULL; 1045 } 1046 } 1047 1048 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); 1049 atomic_set(&clp->cl_refcount, 0); 1050 atomic_set(&clp->cl_cb_set, 0); 1051 INIT_LIST_HEAD(&clp->cl_idhash); 1052 INIT_LIST_HEAD(&clp->cl_strhash); 1053 INIT_LIST_HEAD(&clp->cl_openowners); 1054 INIT_LIST_HEAD(&clp->cl_delegations); 1055 INIT_LIST_HEAD(&clp->cl_lru); 1056 spin_lock_init(&clp->cl_lock); 1057 INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc); 1058 clp->cl_time = get_seconds(); 1059 clear_bit(0, &clp->cl_cb_slot_busy); 1060 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); 1061 copy_verf(clp, verf); 1062 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); 1063 clp->cl_flavor = rqstp->rq_flavor; 1064 copy_cred(&clp->cl_cred, &rqstp->rq_cred); 1065 gen_confirm(clp); 1066 clp->cl_cb_session = NULL; 1067 return clp; 1068 } 1069 1070 static int check_name(struct xdr_netobj name) 1071 { 1072 if (name.len == 0) 1073 return 0; 1074 if (name.len > NFS4_OPAQUE_LIMIT) { 1075 dprintk("NFSD: check_name: name too long(%d)!\n", name.len); 1076 return 0; 1077 } 1078 return 1; 1079 } 1080 1081 static void 1082 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) 1083 { 1084 unsigned int idhashval; 1085 1086 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); 1087 idhashval = clientid_hashval(clp->cl_clientid.cl_id); 1088 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); 1089 renew_client(clp); 1090 } 1091 1092 static void 1093 move_to_confirmed(struct nfs4_client *clp) 1094 { 1095 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); 1096 unsigned int strhashval; 1097 1098 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); 1099 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); 1100 strhashval = clientstr_hashval(clp->cl_recdir); 1101 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); 1102 renew_client(clp); 1103 } 1104 1105 static struct nfs4_client * 1106 find_confirmed_client(clientid_t *clid) 1107 { 1108 struct nfs4_client *clp; 1109 unsigned int idhashval = clientid_hashval(clid->cl_id); 1110 1111 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { 1112 if (same_clid(&clp->cl_clientid, clid)) 1113 return clp; 1114 } 1115 return NULL; 1116 } 1117 1118 static struct nfs4_client * 1119 find_unconfirmed_client(clientid_t *clid) 1120 { 1121 struct nfs4_client *clp; 1122 unsigned int idhashval = clientid_hashval(clid->cl_id); 1123 1124 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { 1125 if (same_clid(&clp->cl_clientid, clid)) 1126 return clp; 1127 } 1128 return NULL; 1129 } 1130 1131 /* 1132 * Return 1 iff clp's clientid establishment method matches the use_exchange_id 1133 * parameter. Matching is based on the fact the at least one of the 1134 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1 1135 * 1136 * FIXME: we need to unify the clientid namespaces for nfsv4.x 1137 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID 1138 * and SET_CLIENTID{,_CONFIRM} 1139 */ 1140 static inline int 1141 match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id) 1142 { 1143 bool has_exchange_flags = (clp->cl_exchange_flags != 0); 1144 return use_exchange_id == has_exchange_flags; 1145 } 1146 1147 static struct nfs4_client * 1148 find_confirmed_client_by_str(const char *dname, unsigned int hashval, 1149 bool use_exchange_id) 1150 { 1151 struct nfs4_client *clp; 1152 1153 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { 1154 if (same_name(clp->cl_recdir, dname) && 1155 match_clientid_establishment(clp, use_exchange_id)) 1156 return clp; 1157 } 1158 return NULL; 1159 } 1160 1161 static struct nfs4_client * 1162 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval, 1163 bool use_exchange_id) 1164 { 1165 struct nfs4_client *clp; 1166 1167 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { 1168 if (same_name(clp->cl_recdir, dname) && 1169 match_clientid_establishment(clp, use_exchange_id)) 1170 return clp; 1171 } 1172 return NULL; 1173 } 1174 1175 static void 1176 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid) 1177 { 1178 struct nfs4_cb_conn *conn = &clp->cl_cb_conn; 1179 unsigned short expected_family; 1180 1181 /* Currently, we only support tcp and tcp6 for the callback channel */ 1182 if (se->se_callback_netid_len == 3 && 1183 !memcmp(se->se_callback_netid_val, "tcp", 3)) 1184 expected_family = AF_INET; 1185 else if (se->se_callback_netid_len == 4 && 1186 !memcmp(se->se_callback_netid_val, "tcp6", 4)) 1187 expected_family = AF_INET6; 1188 else 1189 goto out_err; 1190 1191 conn->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val, 1192 se->se_callback_addr_len, 1193 (struct sockaddr *)&conn->cb_addr, 1194 sizeof(conn->cb_addr)); 1195 1196 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) 1197 goto out_err; 1198 1199 if (conn->cb_addr.ss_family == AF_INET6) 1200 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; 1201 1202 conn->cb_prog = se->se_callback_prog; 1203 conn->cb_ident = se->se_callback_ident; 1204 return; 1205 out_err: 1206 conn->cb_addr.ss_family = AF_UNSPEC; 1207 conn->cb_addrlen = 0; 1208 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " 1209 "will not receive delegations\n", 1210 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); 1211 1212 return; 1213 } 1214 1215 /* 1216 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size. 1217 */ 1218 void 1219 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) 1220 { 1221 struct nfsd4_slot *slot = resp->cstate.slot; 1222 unsigned int base; 1223 1224 dprintk("--> %s slot %p\n", __func__, slot); 1225 1226 slot->sl_opcnt = resp->opcnt; 1227 slot->sl_status = resp->cstate.status; 1228 1229 if (nfsd4_not_cached(resp)) { 1230 slot->sl_datalen = 0; 1231 return; 1232 } 1233 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap; 1234 base = (char *)resp->cstate.datap - 1235 (char *)resp->xbuf->head[0].iov_base; 1236 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data, 1237 slot->sl_datalen)) 1238 WARN("%s: sessions DRC could not cache compound\n", __func__); 1239 return; 1240 } 1241 1242 /* 1243 * Encode the replay sequence operation from the slot values. 1244 * If cachethis is FALSE encode the uncached rep error on the next 1245 * operation which sets resp->p and increments resp->opcnt for 1246 * nfs4svc_encode_compoundres. 1247 * 1248 */ 1249 static __be32 1250 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, 1251 struct nfsd4_compoundres *resp) 1252 { 1253 struct nfsd4_op *op; 1254 struct nfsd4_slot *slot = resp->cstate.slot; 1255 1256 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__, 1257 resp->opcnt, resp->cstate.slot->sl_cachethis); 1258 1259 /* Encode the replayed sequence operation */ 1260 op = &args->ops[resp->opcnt - 1]; 1261 nfsd4_encode_operation(resp, op); 1262 1263 /* Return nfserr_retry_uncached_rep in next operation. */ 1264 if (args->opcnt > 1 && slot->sl_cachethis == 0) { 1265 op = &args->ops[resp->opcnt++]; 1266 op->status = nfserr_retry_uncached_rep; 1267 nfsd4_encode_operation(resp, op); 1268 } 1269 return op->status; 1270 } 1271 1272 /* 1273 * The sequence operation is not cached because we can use the slot and 1274 * session values. 1275 */ 1276 __be32 1277 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, 1278 struct nfsd4_sequence *seq) 1279 { 1280 struct nfsd4_slot *slot = resp->cstate.slot; 1281 __be32 status; 1282 1283 dprintk("--> %s slot %p\n", __func__, slot); 1284 1285 /* Either returns 0 or nfserr_retry_uncached */ 1286 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); 1287 if (status == nfserr_retry_uncached_rep) 1288 return status; 1289 1290 /* The sequence operation has been encoded, cstate->datap set. */ 1291 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen); 1292 1293 resp->opcnt = slot->sl_opcnt; 1294 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen); 1295 status = slot->sl_status; 1296 1297 return status; 1298 } 1299 1300 /* 1301 * Set the exchange_id flags returned by the server. 1302 */ 1303 static void 1304 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) 1305 { 1306 /* pNFS is not supported */ 1307 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; 1308 1309 /* Referrals are supported, Migration is not. */ 1310 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; 1311 1312 /* set the wire flags to return to client. */ 1313 clid->flags = new->cl_exchange_flags; 1314 } 1315 1316 __be32 1317 nfsd4_exchange_id(struct svc_rqst *rqstp, 1318 struct nfsd4_compound_state *cstate, 1319 struct nfsd4_exchange_id *exid) 1320 { 1321 struct nfs4_client *unconf, *conf, *new; 1322 int status; 1323 unsigned int strhashval; 1324 char dname[HEXDIR_LEN]; 1325 char addr_str[INET6_ADDRSTRLEN]; 1326 nfs4_verifier verf = exid->verifier; 1327 struct sockaddr *sa = svc_addr(rqstp); 1328 1329 rpc_ntop(sa, addr_str, sizeof(addr_str)); 1330 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " 1331 "ip_addr=%s flags %x, spa_how %d\n", 1332 __func__, rqstp, exid, exid->clname.len, exid->clname.data, 1333 addr_str, exid->flags, exid->spa_how); 1334 1335 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A)) 1336 return nfserr_inval; 1337 1338 /* Currently only support SP4_NONE */ 1339 switch (exid->spa_how) { 1340 case SP4_NONE: 1341 break; 1342 case SP4_SSV: 1343 return nfserr_encr_alg_unsupp; 1344 default: 1345 BUG(); /* checked by xdr code */ 1346 case SP4_MACH_CRED: 1347 return nfserr_serverfault; /* no excuse :-/ */ 1348 } 1349 1350 status = nfs4_make_rec_clidname(dname, &exid->clname); 1351 1352 if (status) 1353 goto error; 1354 1355 strhashval = clientstr_hashval(dname); 1356 1357 nfs4_lock_state(); 1358 status = nfs_ok; 1359 1360 conf = find_confirmed_client_by_str(dname, strhashval, true); 1361 if (conf) { 1362 if (!same_verf(&verf, &conf->cl_verifier)) { 1363 /* 18.35.4 case 8 */ 1364 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1365 status = nfserr_not_same; 1366 goto out; 1367 } 1368 /* Client reboot: destroy old state */ 1369 expire_client(conf); 1370 goto out_new; 1371 } 1372 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 1373 /* 18.35.4 case 9 */ 1374 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1375 status = nfserr_perm; 1376 goto out; 1377 } 1378 expire_client(conf); 1379 goto out_new; 1380 } 1381 /* 1382 * Set bit when the owner id and verifier map to an already 1383 * confirmed client id (18.35.3). 1384 */ 1385 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; 1386 1387 /* 1388 * Falling into 18.35.4 case 2, possible router replay. 1389 * Leave confirmed record intact and return same result. 1390 */ 1391 copy_verf(conf, &verf); 1392 new = conf; 1393 goto out_copy; 1394 } 1395 1396 /* 18.35.4 case 7 */ 1397 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { 1398 status = nfserr_noent; 1399 goto out; 1400 } 1401 1402 unconf = find_unconfirmed_client_by_str(dname, strhashval, true); 1403 if (unconf) { 1404 /* 1405 * Possible retry or client restart. Per 18.35.4 case 4, 1406 * a new unconfirmed record should be generated regardless 1407 * of whether any properties have changed. 1408 */ 1409 expire_client(unconf); 1410 } 1411 1412 out_new: 1413 /* Normal case */ 1414 new = create_client(exid->clname, dname, rqstp, &verf); 1415 if (new == NULL) { 1416 status = nfserr_jukebox; 1417 goto out; 1418 } 1419 1420 gen_clid(new); 1421 add_to_unconfirmed(new, strhashval); 1422 out_copy: 1423 exid->clientid.cl_boot = new->cl_clientid.cl_boot; 1424 exid->clientid.cl_id = new->cl_clientid.cl_id; 1425 1426 exid->seqid = 1; 1427 nfsd4_set_ex_flags(new, exid); 1428 1429 dprintk("nfsd4_exchange_id seqid %d flags %x\n", 1430 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags); 1431 status = nfs_ok; 1432 1433 out: 1434 nfs4_unlock_state(); 1435 error: 1436 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status)); 1437 return status; 1438 } 1439 1440 static int 1441 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) 1442 { 1443 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, 1444 slot_seqid); 1445 1446 /* The slot is in use, and no response has been sent. */ 1447 if (slot_inuse) { 1448 if (seqid == slot_seqid) 1449 return nfserr_jukebox; 1450 else 1451 return nfserr_seq_misordered; 1452 } 1453 /* Normal */ 1454 if (likely(seqid == slot_seqid + 1)) 1455 return nfs_ok; 1456 /* Replay */ 1457 if (seqid == slot_seqid) 1458 return nfserr_replay_cache; 1459 /* Wraparound */ 1460 if (seqid == 1 && (slot_seqid + 1) == 0) 1461 return nfs_ok; 1462 /* Misordered replay or misordered new request */ 1463 return nfserr_seq_misordered; 1464 } 1465 1466 /* 1467 * Cache the create session result into the create session single DRC 1468 * slot cache by saving the xdr structure. sl_seqid has been set. 1469 * Do this for solo or embedded create session operations. 1470 */ 1471 static void 1472 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, 1473 struct nfsd4_clid_slot *slot, int nfserr) 1474 { 1475 slot->sl_status = nfserr; 1476 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); 1477 } 1478 1479 static __be32 1480 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, 1481 struct nfsd4_clid_slot *slot) 1482 { 1483 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); 1484 return slot->sl_status; 1485 } 1486 1487 __be32 1488 nfsd4_create_session(struct svc_rqst *rqstp, 1489 struct nfsd4_compound_state *cstate, 1490 struct nfsd4_create_session *cr_ses) 1491 { 1492 struct sockaddr *sa = svc_addr(rqstp); 1493 struct nfs4_client *conf, *unconf; 1494 struct nfsd4_session *new; 1495 struct nfsd4_clid_slot *cs_slot = NULL; 1496 bool confirm_me = false; 1497 int status = 0; 1498 1499 nfs4_lock_state(); 1500 unconf = find_unconfirmed_client(&cr_ses->clientid); 1501 conf = find_confirmed_client(&cr_ses->clientid); 1502 1503 if (conf) { 1504 cs_slot = &conf->cl_cs_slot; 1505 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 1506 if (status == nfserr_replay_cache) { 1507 dprintk("Got a create_session replay! seqid= %d\n", 1508 cs_slot->sl_seqid); 1509 /* Return the cached reply status */ 1510 status = nfsd4_replay_create_session(cr_ses, cs_slot); 1511 goto out; 1512 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) { 1513 status = nfserr_seq_misordered; 1514 dprintk("Sequence misordered!\n"); 1515 dprintk("Expected seqid= %d but got seqid= %d\n", 1516 cs_slot->sl_seqid, cr_ses->seqid); 1517 goto out; 1518 } 1519 } else if (unconf) { 1520 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || 1521 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { 1522 status = nfserr_clid_inuse; 1523 goto out; 1524 } 1525 1526 cs_slot = &unconf->cl_cs_slot; 1527 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); 1528 if (status) { 1529 /* an unconfirmed replay returns misordered */ 1530 status = nfserr_seq_misordered; 1531 goto out; 1532 } 1533 1534 confirm_me = true; 1535 conf = unconf; 1536 } else { 1537 status = nfserr_stale_clientid; 1538 goto out; 1539 } 1540 1541 /* 1542 * XXX: we should probably set this at creation time, and check 1543 * for consistent minorversion use throughout: 1544 */ 1545 conf->cl_minorversion = 1; 1546 /* 1547 * We do not support RDMA or persistent sessions 1548 */ 1549 cr_ses->flags &= ~SESSION4_PERSIST; 1550 cr_ses->flags &= ~SESSION4_RDMA; 1551 1552 status = nfserr_jukebox; 1553 new = alloc_init_session(rqstp, conf, cr_ses); 1554 if (!new) 1555 goto out; 1556 status = nfs_ok; 1557 memcpy(cr_ses->sessionid.data, new->se_sessionid.data, 1558 NFS4_MAX_SESSIONID_LEN); 1559 cs_slot->sl_seqid++; 1560 cr_ses->seqid = cs_slot->sl_seqid; 1561 1562 /* cache solo and embedded create sessions under the state lock */ 1563 nfsd4_cache_create_session(cr_ses, cs_slot, status); 1564 if (confirm_me) 1565 move_to_confirmed(conf); 1566 out: 1567 nfs4_unlock_state(); 1568 dprintk("%s returns %d\n", __func__, ntohl(status)); 1569 return status; 1570 } 1571 1572 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp) 1573 { 1574 struct nfsd4_compoundres *resp = rqstp->rq_resp; 1575 struct nfsd4_compoundargs *argp = rqstp->rq_argp; 1576 1577 return argp->opcnt == resp->opcnt; 1578 } 1579 1580 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) 1581 { 1582 if (!session) 1583 return 0; 1584 return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); 1585 } 1586 1587 __be32 1588 nfsd4_destroy_session(struct svc_rqst *r, 1589 struct nfsd4_compound_state *cstate, 1590 struct nfsd4_destroy_session *sessionid) 1591 { 1592 struct nfsd4_session *ses; 1593 u32 status = nfserr_badsession; 1594 1595 /* Notes: 1596 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid 1597 * - Should we return nfserr_back_chan_busy if waiting for 1598 * callbacks on to-be-destroyed session? 1599 * - Do we need to clear any callback info from previous session? 1600 */ 1601 1602 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { 1603 if (!nfsd4_last_compound_op(r)) 1604 return nfserr_not_only_op; 1605 } 1606 dump_sessionid(__func__, &sessionid->sessionid); 1607 spin_lock(&client_lock); 1608 ses = find_in_sessionid_hashtbl(&sessionid->sessionid); 1609 if (!ses) { 1610 spin_unlock(&client_lock); 1611 goto out; 1612 } 1613 1614 unhash_session(ses); 1615 spin_unlock(&client_lock); 1616 1617 nfs4_lock_state(); 1618 /* wait for callbacks */ 1619 nfsd4_shutdown_callback(ses->se_client); 1620 nfs4_unlock_state(); 1621 1622 nfsd4_del_conns(ses); 1623 1624 nfsd4_put_session(ses); 1625 status = nfs_ok; 1626 out: 1627 dprintk("%s returns %d\n", __func__, ntohl(status)); 1628 return status; 1629 } 1630 1631 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) 1632 { 1633 struct nfsd4_conn *c; 1634 1635 list_for_each_entry(c, &s->se_conns, cn_persession) { 1636 if (c->cn_xprt == xpt) { 1637 return c; 1638 } 1639 } 1640 return NULL; 1641 } 1642 1643 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) 1644 { 1645 struct nfs4_client *clp = ses->se_client; 1646 struct nfsd4_conn *c; 1647 1648 spin_lock(&clp->cl_lock); 1649 c = __nfsd4_find_conn(new->cn_xprt, ses); 1650 if (c) { 1651 spin_unlock(&clp->cl_lock); 1652 free_conn(new); 1653 return; 1654 } 1655 __nfsd4_hash_conn(new, ses); 1656 spin_unlock(&clp->cl_lock); 1657 nfsd4_register_conn(new); 1658 return; 1659 } 1660 1661 __be32 1662 nfsd4_sequence(struct svc_rqst *rqstp, 1663 struct nfsd4_compound_state *cstate, 1664 struct nfsd4_sequence *seq) 1665 { 1666 struct nfsd4_compoundres *resp = rqstp->rq_resp; 1667 struct nfsd4_session *session; 1668 struct nfsd4_slot *slot; 1669 struct nfsd4_conn *conn; 1670 int status; 1671 1672 if (resp->opcnt != 1) 1673 return nfserr_sequence_pos; 1674 1675 /* 1676 * Will be either used or freed by nfsd4_sequence_check_conn 1677 * below. 1678 */ 1679 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); 1680 if (!conn) 1681 return nfserr_jukebox; 1682 1683 spin_lock(&client_lock); 1684 status = nfserr_badsession; 1685 session = find_in_sessionid_hashtbl(&seq->sessionid); 1686 if (!session) 1687 goto out; 1688 1689 status = nfserr_badslot; 1690 if (seq->slotid >= session->se_fchannel.maxreqs) 1691 goto out; 1692 1693 slot = session->se_slots[seq->slotid]; 1694 dprintk("%s: slotid %d\n", __func__, seq->slotid); 1695 1696 /* We do not negotiate the number of slots yet, so set the 1697 * maxslots to the session maxreqs which is used to encode 1698 * sr_highest_slotid and the sr_target_slot id to maxslots */ 1699 seq->maxslots = session->se_fchannel.maxreqs; 1700 1701 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse); 1702 if (status == nfserr_replay_cache) { 1703 cstate->slot = slot; 1704 cstate->session = session; 1705 /* Return the cached reply status and set cstate->status 1706 * for nfsd4_proc_compound processing */ 1707 status = nfsd4_replay_cache_entry(resp, seq); 1708 cstate->status = nfserr_replay_cache; 1709 goto out; 1710 } 1711 if (status) 1712 goto out; 1713 1714 nfsd4_sequence_check_conn(conn, session); 1715 conn = NULL; 1716 1717 /* Success! bump slot seqid */ 1718 slot->sl_inuse = true; 1719 slot->sl_seqid = seq->seqid; 1720 slot->sl_cachethis = seq->cachethis; 1721 1722 cstate->slot = slot; 1723 cstate->session = session; 1724 1725 out: 1726 /* Hold a session reference until done processing the compound. */ 1727 if (cstate->session) { 1728 nfsd4_get_session(cstate->session); 1729 atomic_inc(&session->se_client->cl_refcount); 1730 } 1731 kfree(conn); 1732 spin_unlock(&client_lock); 1733 dprintk("%s: return %d\n", __func__, ntohl(status)); 1734 return status; 1735 } 1736 1737 __be32 1738 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc) 1739 { 1740 if (rc->rca_one_fs) { 1741 if (!cstate->current_fh.fh_dentry) 1742 return nfserr_nofilehandle; 1743 /* 1744 * We don't take advantage of the rca_one_fs case. 1745 * That's OK, it's optional, we can safely ignore it. 1746 */ 1747 return nfs_ok; 1748 } 1749 nfs4_lock_state(); 1750 if (is_client_expired(cstate->session->se_client)) { 1751 nfs4_unlock_state(); 1752 /* 1753 * The following error isn't really legal. 1754 * But we only get here if the client just explicitly 1755 * destroyed the client. Surely it no longer cares what 1756 * error it gets back on an operation for the dead 1757 * client. 1758 */ 1759 return nfserr_stale_clientid; 1760 } 1761 nfsd4_create_clid_dir(cstate->session->se_client); 1762 nfs4_unlock_state(); 1763 return nfs_ok; 1764 } 1765 1766 __be32 1767 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 1768 struct nfsd4_setclientid *setclid) 1769 { 1770 struct sockaddr *sa = svc_addr(rqstp); 1771 struct xdr_netobj clname = { 1772 .len = setclid->se_namelen, 1773 .data = setclid->se_name, 1774 }; 1775 nfs4_verifier clverifier = setclid->se_verf; 1776 unsigned int strhashval; 1777 struct nfs4_client *conf, *unconf, *new; 1778 __be32 status; 1779 char dname[HEXDIR_LEN]; 1780 1781 if (!check_name(clname)) 1782 return nfserr_inval; 1783 1784 status = nfs4_make_rec_clidname(dname, &clname); 1785 if (status) 1786 return status; 1787 1788 /* 1789 * XXX The Duplicate Request Cache (DRC) has been checked (??) 1790 * We get here on a DRC miss. 1791 */ 1792 1793 strhashval = clientstr_hashval(dname); 1794 1795 nfs4_lock_state(); 1796 conf = find_confirmed_client_by_str(dname, strhashval, false); 1797 if (conf) { 1798 /* RFC 3530 14.2.33 CASE 0: */ 1799 status = nfserr_clid_inuse; 1800 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { 1801 char addr_str[INET6_ADDRSTRLEN]; 1802 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, 1803 sizeof(addr_str)); 1804 dprintk("NFSD: setclientid: string in use by client " 1805 "at %s\n", addr_str); 1806 goto out; 1807 } 1808 } 1809 /* 1810 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION") 1811 * has a description of SETCLIENTID request processing consisting 1812 * of 5 bullet points, labeled as CASE0 - CASE4 below. 1813 */ 1814 unconf = find_unconfirmed_client_by_str(dname, strhashval, false); 1815 status = nfserr_resource; 1816 if (!conf) { 1817 /* 1818 * RFC 3530 14.2.33 CASE 4: 1819 * placed first, because it is the normal case 1820 */ 1821 if (unconf) 1822 expire_client(unconf); 1823 new = create_client(clname, dname, rqstp, &clverifier); 1824 if (new == NULL) 1825 goto out; 1826 gen_clid(new); 1827 } else if (same_verf(&conf->cl_verifier, &clverifier)) { 1828 /* 1829 * RFC 3530 14.2.33 CASE 1: 1830 * probable callback update 1831 */ 1832 if (unconf) { 1833 /* Note this is removing unconfirmed {*x***}, 1834 * which is stronger than RFC recommended {vxc**}. 1835 * This has the advantage that there is at most 1836 * one {*x***} in either list at any time. 1837 */ 1838 expire_client(unconf); 1839 } 1840 new = create_client(clname, dname, rqstp, &clverifier); 1841 if (new == NULL) 1842 goto out; 1843 copy_clid(new, conf); 1844 } else if (!unconf) { 1845 /* 1846 * RFC 3530 14.2.33 CASE 2: 1847 * probable client reboot; state will be removed if 1848 * confirmed. 1849 */ 1850 new = create_client(clname, dname, rqstp, &clverifier); 1851 if (new == NULL) 1852 goto out; 1853 gen_clid(new); 1854 } else { 1855 /* 1856 * RFC 3530 14.2.33 CASE 3: 1857 * probable client reboot; state will be removed if 1858 * confirmed. 1859 */ 1860 expire_client(unconf); 1861 new = create_client(clname, dname, rqstp, &clverifier); 1862 if (new == NULL) 1863 goto out; 1864 gen_clid(new); 1865 } 1866 /* 1867 * XXX: we should probably set this at creation time, and check 1868 * for consistent minorversion use throughout: 1869 */ 1870 new->cl_minorversion = 0; 1871 gen_callback(new, setclid, rpc_get_scope_id(sa)); 1872 add_to_unconfirmed(new, strhashval); 1873 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; 1874 setclid->se_clientid.cl_id = new->cl_clientid.cl_id; 1875 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); 1876 status = nfs_ok; 1877 out: 1878 nfs4_unlock_state(); 1879 return status; 1880 } 1881 1882 1883 /* 1884 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has 1885 * a description of SETCLIENTID_CONFIRM request processing consisting of 4 1886 * bullets, labeled as CASE1 - CASE4 below. 1887 */ 1888 __be32 1889 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, 1890 struct nfsd4_compound_state *cstate, 1891 struct nfsd4_setclientid_confirm *setclientid_confirm) 1892 { 1893 struct sockaddr *sa = svc_addr(rqstp); 1894 struct nfs4_client *conf, *unconf; 1895 nfs4_verifier confirm = setclientid_confirm->sc_confirm; 1896 clientid_t * clid = &setclientid_confirm->sc_clientid; 1897 __be32 status; 1898 1899 if (STALE_CLIENTID(clid)) 1900 return nfserr_stale_clientid; 1901 /* 1902 * XXX The Duplicate Request Cache (DRC) has been checked (??) 1903 * We get here on a DRC miss. 1904 */ 1905 1906 nfs4_lock_state(); 1907 1908 conf = find_confirmed_client(clid); 1909 unconf = find_unconfirmed_client(clid); 1910 1911 status = nfserr_clid_inuse; 1912 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa)) 1913 goto out; 1914 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa)) 1915 goto out; 1916 1917 /* 1918 * section 14.2.34 of RFC 3530 has a description of 1919 * SETCLIENTID_CONFIRM request processing consisting 1920 * of 4 bullet points, labeled as CASE1 - CASE4 below. 1921 */ 1922 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) { 1923 /* 1924 * RFC 3530 14.2.34 CASE 1: 1925 * callback update 1926 */ 1927 if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) 1928 status = nfserr_clid_inuse; 1929 else { 1930 atomic_set(&conf->cl_cb_set, 0); 1931 nfsd4_change_callback(conf, &unconf->cl_cb_conn); 1932 nfsd4_probe_callback(conf); 1933 expire_client(unconf); 1934 status = nfs_ok; 1935 1936 } 1937 } else if (conf && !unconf) { 1938 /* 1939 * RFC 3530 14.2.34 CASE 2: 1940 * probable retransmitted request; play it safe and 1941 * do nothing. 1942 */ 1943 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) 1944 status = nfserr_clid_inuse; 1945 else 1946 status = nfs_ok; 1947 } else if (!conf && unconf 1948 && same_verf(&unconf->cl_confirm, &confirm)) { 1949 /* 1950 * RFC 3530 14.2.34 CASE 3: 1951 * Normal case; new or rebooted client: 1952 */ 1953 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { 1954 status = nfserr_clid_inuse; 1955 } else { 1956 unsigned int hash = 1957 clientstr_hashval(unconf->cl_recdir); 1958 conf = find_confirmed_client_by_str(unconf->cl_recdir, 1959 hash, false); 1960 if (conf) { 1961 nfsd4_remove_clid_dir(conf); 1962 expire_client(conf); 1963 } 1964 move_to_confirmed(unconf); 1965 conf = unconf; 1966 nfsd4_probe_callback(conf); 1967 status = nfs_ok; 1968 } 1969 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) 1970 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, 1971 &confirm)))) { 1972 /* 1973 * RFC 3530 14.2.34 CASE 4: 1974 * Client probably hasn't noticed that we rebooted yet. 1975 */ 1976 status = nfserr_stale_clientid; 1977 } else { 1978 /* check that we have hit one of the cases...*/ 1979 status = nfserr_clid_inuse; 1980 } 1981 out: 1982 nfs4_unlock_state(); 1983 return status; 1984 } 1985 1986 /* OPEN Share state helper functions */ 1987 static inline struct nfs4_file * 1988 alloc_init_file(struct inode *ino) 1989 { 1990 struct nfs4_file *fp; 1991 unsigned int hashval = file_hashval(ino); 1992 1993 fp = kmem_cache_alloc(file_slab, GFP_KERNEL); 1994 if (fp) { 1995 atomic_set(&fp->fi_ref, 1); 1996 INIT_LIST_HEAD(&fp->fi_hash); 1997 INIT_LIST_HEAD(&fp->fi_stateids); 1998 INIT_LIST_HEAD(&fp->fi_delegations); 1999 fp->fi_inode = igrab(ino); 2000 fp->fi_id = current_fileid++; 2001 fp->fi_had_conflict = false; 2002 memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); 2003 memset(fp->fi_access, 0, sizeof(fp->fi_access)); 2004 spin_lock(&recall_lock); 2005 list_add(&fp->fi_hash, &file_hashtbl[hashval]); 2006 spin_unlock(&recall_lock); 2007 return fp; 2008 } 2009 return NULL; 2010 } 2011 2012 static void 2013 nfsd4_free_slab(struct kmem_cache **slab) 2014 { 2015 if (*slab == NULL) 2016 return; 2017 kmem_cache_destroy(*slab); 2018 *slab = NULL; 2019 } 2020 2021 void 2022 nfsd4_free_slabs(void) 2023 { 2024 nfsd4_free_slab(&stateowner_slab); 2025 nfsd4_free_slab(&file_slab); 2026 nfsd4_free_slab(&stateid_slab); 2027 nfsd4_free_slab(&deleg_slab); 2028 } 2029 2030 static int 2031 nfsd4_init_slabs(void) 2032 { 2033 stateowner_slab = kmem_cache_create("nfsd4_stateowners", 2034 sizeof(struct nfs4_stateowner), 0, 0, NULL); 2035 if (stateowner_slab == NULL) 2036 goto out_nomem; 2037 file_slab = kmem_cache_create("nfsd4_files", 2038 sizeof(struct nfs4_file), 0, 0, NULL); 2039 if (file_slab == NULL) 2040 goto out_nomem; 2041 stateid_slab = kmem_cache_create("nfsd4_stateids", 2042 sizeof(struct nfs4_stateid), 0, 0, NULL); 2043 if (stateid_slab == NULL) 2044 goto out_nomem; 2045 deleg_slab = kmem_cache_create("nfsd4_delegations", 2046 sizeof(struct nfs4_delegation), 0, 0, NULL); 2047 if (deleg_slab == NULL) 2048 goto out_nomem; 2049 return 0; 2050 out_nomem: 2051 nfsd4_free_slabs(); 2052 dprintk("nfsd4: out of memory while initializing nfsv4\n"); 2053 return -ENOMEM; 2054 } 2055 2056 void 2057 nfs4_free_stateowner(struct kref *kref) 2058 { 2059 struct nfs4_stateowner *sop = 2060 container_of(kref, struct nfs4_stateowner, so_ref); 2061 kfree(sop->so_owner.data); 2062 kmem_cache_free(stateowner_slab, sop); 2063 } 2064 2065 static inline struct nfs4_stateowner * 2066 alloc_stateowner(struct xdr_netobj *owner) 2067 { 2068 struct nfs4_stateowner *sop; 2069 2070 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { 2071 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { 2072 memcpy(sop->so_owner.data, owner->data, owner->len); 2073 sop->so_owner.len = owner->len; 2074 kref_init(&sop->so_ref); 2075 return sop; 2076 } 2077 kmem_cache_free(stateowner_slab, sop); 2078 } 2079 return NULL; 2080 } 2081 2082 static struct nfs4_stateowner * 2083 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { 2084 struct nfs4_stateowner *sop; 2085 struct nfs4_replay *rp; 2086 unsigned int idhashval; 2087 2088 if (!(sop = alloc_stateowner(&open->op_owner))) 2089 return NULL; 2090 idhashval = ownerid_hashval(current_ownerid); 2091 INIT_LIST_HEAD(&sop->so_idhash); 2092 INIT_LIST_HEAD(&sop->so_strhash); 2093 INIT_LIST_HEAD(&sop->so_perclient); 2094 INIT_LIST_HEAD(&sop->so_stateids); 2095 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ 2096 INIT_LIST_HEAD(&sop->so_close_lru); 2097 sop->so_time = 0; 2098 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); 2099 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); 2100 list_add(&sop->so_perclient, &clp->cl_openowners); 2101 sop->so_is_open_owner = 1; 2102 sop->so_id = current_ownerid++; 2103 sop->so_client = clp; 2104 sop->so_seqid = open->op_seqid; 2105 sop->so_confirmed = 0; 2106 rp = &sop->so_replay; 2107 rp->rp_status = nfserr_serverfault; 2108 rp->rp_buflen = 0; 2109 rp->rp_buf = rp->rp_ibuf; 2110 return sop; 2111 } 2112 2113 static inline void 2114 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { 2115 struct nfs4_stateowner *sop = open->op_stateowner; 2116 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 2117 2118 INIT_LIST_HEAD(&stp->st_hash); 2119 INIT_LIST_HEAD(&stp->st_perstateowner); 2120 INIT_LIST_HEAD(&stp->st_lockowners); 2121 INIT_LIST_HEAD(&stp->st_perfile); 2122 list_add(&stp->st_hash, &stateid_hashtbl[hashval]); 2123 list_add(&stp->st_perstateowner, &sop->so_stateids); 2124 list_add(&stp->st_perfile, &fp->fi_stateids); 2125 stp->st_stateowner = sop; 2126 get_nfs4_file(fp); 2127 stp->st_file = fp; 2128 stp->st_stateid.si_boot = boot_time; 2129 stp->st_stateid.si_stateownerid = sop->so_id; 2130 stp->st_stateid.si_fileid = fp->fi_id; 2131 stp->st_stateid.si_generation = 0; 2132 stp->st_access_bmap = 0; 2133 stp->st_deny_bmap = 0; 2134 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK, 2135 &stp->st_access_bmap); 2136 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 2137 stp->st_openstp = NULL; 2138 } 2139 2140 static void 2141 move_to_close_lru(struct nfs4_stateowner *sop) 2142 { 2143 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); 2144 2145 list_move_tail(&sop->so_close_lru, &close_lru); 2146 sop->so_time = get_seconds(); 2147 } 2148 2149 static int 2150 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, 2151 clientid_t *clid) 2152 { 2153 return (sop->so_owner.len == owner->len) && 2154 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && 2155 (sop->so_client->cl_clientid.cl_id == clid->cl_id); 2156 } 2157 2158 static struct nfs4_stateowner * 2159 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) 2160 { 2161 struct nfs4_stateowner *so = NULL; 2162 2163 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { 2164 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) 2165 return so; 2166 } 2167 return NULL; 2168 } 2169 2170 /* search file_hashtbl[] for file */ 2171 static struct nfs4_file * 2172 find_file(struct inode *ino) 2173 { 2174 unsigned int hashval = file_hashval(ino); 2175 struct nfs4_file *fp; 2176 2177 spin_lock(&recall_lock); 2178 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { 2179 if (fp->fi_inode == ino) { 2180 get_nfs4_file(fp); 2181 spin_unlock(&recall_lock); 2182 return fp; 2183 } 2184 } 2185 spin_unlock(&recall_lock); 2186 return NULL; 2187 } 2188 2189 static inline int access_valid(u32 x, u32 minorversion) 2190 { 2191 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ) 2192 return 0; 2193 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH) 2194 return 0; 2195 x &= ~NFS4_SHARE_ACCESS_MASK; 2196 if (minorversion && x) { 2197 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL) 2198 return 0; 2199 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED) 2200 return 0; 2201 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK); 2202 } 2203 if (x) 2204 return 0; 2205 return 1; 2206 } 2207 2208 static inline int deny_valid(u32 x) 2209 { 2210 /* Note: unlike access bits, deny bits may be zero. */ 2211 return x <= NFS4_SHARE_DENY_BOTH; 2212 } 2213 2214 /* 2215 * Called to check deny when READ with all zero stateid or 2216 * WRITE with all zero or all one stateid 2217 */ 2218 static __be32 2219 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 2220 { 2221 struct inode *ino = current_fh->fh_dentry->d_inode; 2222 struct nfs4_file *fp; 2223 struct nfs4_stateid *stp; 2224 __be32 ret; 2225 2226 dprintk("NFSD: nfs4_share_conflict\n"); 2227 2228 fp = find_file(ino); 2229 if (!fp) 2230 return nfs_ok; 2231 ret = nfserr_locked; 2232 /* Search for conflicting share reservations */ 2233 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { 2234 if (test_bit(deny_type, &stp->st_deny_bmap) || 2235 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) 2236 goto out; 2237 } 2238 ret = nfs_ok; 2239 out: 2240 put_nfs4_file(fp); 2241 return ret; 2242 } 2243 2244 static inline void 2245 nfs4_file_downgrade(struct nfs4_file *fp, unsigned int share_access) 2246 { 2247 if (share_access & NFS4_SHARE_ACCESS_WRITE) 2248 nfs4_file_put_access(fp, O_WRONLY); 2249 if (share_access & NFS4_SHARE_ACCESS_READ) 2250 nfs4_file_put_access(fp, O_RDONLY); 2251 } 2252 2253 /* 2254 * Spawn a thread to perform a recall on the delegation represented 2255 * by the lease (file_lock) 2256 * 2257 * Called from break_lease() with lock_kernel() held. 2258 * Note: we assume break_lease will only call this *once* for any given 2259 * lease. 2260 */ 2261 static 2262 void nfsd_break_deleg_cb(struct file_lock *fl) 2263 { 2264 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 2265 2266 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); 2267 if (!dp) 2268 return; 2269 2270 /* We're assuming the state code never drops its reference 2271 * without first removing the lease. Since we're in this lease 2272 * callback (and since the lease code is serialized by the kernel 2273 * lock) we know the server hasn't removed the lease yet, we know 2274 * it's safe to take a reference: */ 2275 atomic_inc(&dp->dl_count); 2276 2277 spin_lock(&recall_lock); 2278 list_add_tail(&dp->dl_recall_lru, &del_recall_lru); 2279 spin_unlock(&recall_lock); 2280 2281 /* only place dl_time is set. protected by lock_kernel*/ 2282 dp->dl_time = get_seconds(); 2283 2284 /* 2285 * We don't want the locks code to timeout the lease for us; 2286 * we'll remove it ourself if the delegation isn't returned 2287 * in time. 2288 */ 2289 fl->fl_break_time = 0; 2290 2291 dp->dl_file->fi_had_conflict = true; 2292 nfsd4_cb_recall(dp); 2293 } 2294 2295 /* 2296 * The file_lock is being reapd. 2297 * 2298 * Called by locks_free_lock() with lock_kernel() held. 2299 */ 2300 static 2301 void nfsd_release_deleg_cb(struct file_lock *fl) 2302 { 2303 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; 2304 2305 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count)); 2306 2307 if (!(fl->fl_flags & FL_LEASE) || !dp) 2308 return; 2309 dp->dl_flock = NULL; 2310 } 2311 2312 /* 2313 * Set the delegation file_lock back pointer. 2314 * 2315 * Called from setlease() with lock_kernel() held. 2316 */ 2317 static 2318 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl) 2319 { 2320 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner; 2321 2322 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp); 2323 if (!dp) 2324 return; 2325 dp->dl_flock = new; 2326 } 2327 2328 /* 2329 * Called from setlease() with lock_kernel() held 2330 */ 2331 static 2332 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) 2333 { 2334 struct nfs4_delegation *onlistd = 2335 (struct nfs4_delegation *)onlist->fl_owner; 2336 struct nfs4_delegation *tryd = 2337 (struct nfs4_delegation *)try->fl_owner; 2338 2339 if (onlist->fl_lmops != try->fl_lmops) 2340 return 0; 2341 2342 return onlistd->dl_client == tryd->dl_client; 2343 } 2344 2345 2346 static 2347 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) 2348 { 2349 if (arg & F_UNLCK) 2350 return lease_modify(onlist, arg); 2351 else 2352 return -EAGAIN; 2353 } 2354 2355 static const struct lock_manager_operations nfsd_lease_mng_ops = { 2356 .fl_break = nfsd_break_deleg_cb, 2357 .fl_release_private = nfsd_release_deleg_cb, 2358 .fl_copy_lock = nfsd_copy_lock_deleg_cb, 2359 .fl_mylease = nfsd_same_client_deleg_cb, 2360 .fl_change = nfsd_change_deleg_cb, 2361 }; 2362 2363 2364 __be32 2365 nfsd4_process_open1(struct nfsd4_compound_state *cstate, 2366 struct nfsd4_open *open) 2367 { 2368 clientid_t *clientid = &open->op_clientid; 2369 struct nfs4_client *clp = NULL; 2370 unsigned int strhashval; 2371 struct nfs4_stateowner *sop = NULL; 2372 2373 if (!check_name(open->op_owner)) 2374 return nfserr_inval; 2375 2376 if (STALE_CLIENTID(&open->op_clientid)) 2377 return nfserr_stale_clientid; 2378 2379 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); 2380 sop = find_openstateowner_str(strhashval, open); 2381 open->op_stateowner = sop; 2382 if (!sop) { 2383 /* Make sure the client's lease hasn't expired. */ 2384 clp = find_confirmed_client(clientid); 2385 if (clp == NULL) 2386 return nfserr_expired; 2387 goto renew; 2388 } 2389 /* When sessions are used, skip open sequenceid processing */ 2390 if (nfsd4_has_session(cstate)) 2391 goto renew; 2392 if (!sop->so_confirmed) { 2393 /* Replace unconfirmed owners without checking for replay. */ 2394 clp = sop->so_client; 2395 release_openowner(sop); 2396 open->op_stateowner = NULL; 2397 goto renew; 2398 } 2399 if (open->op_seqid == sop->so_seqid - 1) { 2400 if (sop->so_replay.rp_buflen) 2401 return nfserr_replay_me; 2402 /* The original OPEN failed so spectacularly 2403 * that we don't even have replay data saved! 2404 * Therefore, we have no choice but to continue 2405 * processing this OPEN; presumably, we'll 2406 * fail again for the same reason. 2407 */ 2408 dprintk("nfsd4_process_open1: replay with no replay cache\n"); 2409 goto renew; 2410 } 2411 if (open->op_seqid != sop->so_seqid) 2412 return nfserr_bad_seqid; 2413 renew: 2414 if (open->op_stateowner == NULL) { 2415 sop = alloc_init_open_stateowner(strhashval, clp, open); 2416 if (sop == NULL) 2417 return nfserr_resource; 2418 open->op_stateowner = sop; 2419 } 2420 list_del_init(&sop->so_close_lru); 2421 renew_client(sop->so_client); 2422 return nfs_ok; 2423 } 2424 2425 static inline __be32 2426 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) 2427 { 2428 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) 2429 return nfserr_openmode; 2430 else 2431 return nfs_ok; 2432 } 2433 2434 static struct nfs4_delegation * 2435 find_delegation_file(struct nfs4_file *fp, stateid_t *stid) 2436 { 2437 struct nfs4_delegation *dp; 2438 2439 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) { 2440 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) 2441 return dp; 2442 } 2443 return NULL; 2444 } 2445 2446 int share_access_to_flags(u32 share_access) 2447 { 2448 share_access &= ~NFS4_SHARE_WANT_MASK; 2449 2450 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; 2451 } 2452 2453 static __be32 2454 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, 2455 struct nfs4_delegation **dp) 2456 { 2457 int flags; 2458 __be32 status = nfserr_bad_stateid; 2459 2460 *dp = find_delegation_file(fp, &open->op_delegate_stateid); 2461 if (*dp == NULL) 2462 goto out; 2463 flags = share_access_to_flags(open->op_share_access); 2464 status = nfs4_check_delegmode(*dp, flags); 2465 if (status) 2466 *dp = NULL; 2467 out: 2468 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR) 2469 return nfs_ok; 2470 if (status) 2471 return status; 2472 open->op_stateowner->so_confirmed = 1; 2473 return nfs_ok; 2474 } 2475 2476 static __be32 2477 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) 2478 { 2479 struct nfs4_stateid *local; 2480 __be32 status = nfserr_share_denied; 2481 struct nfs4_stateowner *sop = open->op_stateowner; 2482 2483 list_for_each_entry(local, &fp->fi_stateids, st_perfile) { 2484 /* ignore lock owners */ 2485 if (local->st_stateowner->so_is_open_owner == 0) 2486 continue; 2487 /* remember if we have seen this open owner */ 2488 if (local->st_stateowner == sop) 2489 *stpp = local; 2490 /* check for conflicting share reservations */ 2491 if (!test_share(local, open)) 2492 goto out; 2493 } 2494 status = 0; 2495 out: 2496 return status; 2497 } 2498 2499 static inline struct nfs4_stateid * 2500 nfs4_alloc_stateid(void) 2501 { 2502 return kmem_cache_alloc(stateid_slab, GFP_KERNEL); 2503 } 2504 2505 static inline int nfs4_access_to_access(u32 nfs4_access) 2506 { 2507 int flags = 0; 2508 2509 if (nfs4_access & NFS4_SHARE_ACCESS_READ) 2510 flags |= NFSD_MAY_READ; 2511 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) 2512 flags |= NFSD_MAY_WRITE; 2513 return flags; 2514 } 2515 2516 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file 2517 *fp, struct svc_fh *cur_fh, u32 nfs4_access) 2518 { 2519 __be32 status; 2520 int oflag = nfs4_access_to_omode(nfs4_access); 2521 int access = nfs4_access_to_access(nfs4_access); 2522 2523 if (!fp->fi_fds[oflag]) { 2524 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, 2525 &fp->fi_fds[oflag]); 2526 if (status == nfserr_dropit) 2527 status = nfserr_jukebox; 2528 if (status) 2529 return status; 2530 } 2531 nfs4_file_get_access(fp, oflag); 2532 2533 return nfs_ok; 2534 } 2535 2536 static __be32 2537 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, 2538 struct nfs4_file *fp, struct svc_fh *cur_fh, 2539 struct nfsd4_open *open) 2540 { 2541 struct nfs4_stateid *stp; 2542 __be32 status; 2543 2544 stp = nfs4_alloc_stateid(); 2545 if (stp == NULL) 2546 return nfserr_resource; 2547 2548 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open->op_share_access); 2549 if (status) { 2550 kmem_cache_free(stateid_slab, stp); 2551 return status; 2552 } 2553 *stpp = stp; 2554 return 0; 2555 } 2556 2557 static inline __be32 2558 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 2559 struct nfsd4_open *open) 2560 { 2561 struct iattr iattr = { 2562 .ia_valid = ATTR_SIZE, 2563 .ia_size = 0, 2564 }; 2565 if (!open->op_truncate) 2566 return 0; 2567 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) 2568 return nfserr_inval; 2569 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); 2570 } 2571 2572 static __be32 2573 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) 2574 { 2575 u32 op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK; 2576 bool new_access; 2577 __be32 status; 2578 2579 new_access = !test_bit(op_share_access, &stp->st_access_bmap); 2580 if (new_access) { 2581 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access); 2582 if (status) 2583 return status; 2584 } 2585 status = nfsd4_truncate(rqstp, cur_fh, open); 2586 if (status) { 2587 if (new_access) { 2588 int oflag = nfs4_access_to_omode(new_access); 2589 nfs4_file_put_access(fp, oflag); 2590 } 2591 return status; 2592 } 2593 /* remember the open */ 2594 __set_bit(op_share_access, &stp->st_access_bmap); 2595 __set_bit(open->op_share_deny, &stp->st_deny_bmap); 2596 2597 return nfs_ok; 2598 } 2599 2600 2601 static void 2602 nfs4_set_claim_prev(struct nfsd4_open *open) 2603 { 2604 open->op_stateowner->so_confirmed = 1; 2605 open->op_stateowner->so_client->cl_firststate = 1; 2606 } 2607 2608 /* 2609 * Attempt to hand out a delegation. 2610 */ 2611 static void 2612 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp) 2613 { 2614 struct nfs4_delegation *dp; 2615 struct nfs4_stateowner *sop = stp->st_stateowner; 2616 int cb_up = atomic_read(&sop->so_client->cl_cb_set); 2617 struct file_lock *fl; 2618 int status, flag = 0; 2619 2620 flag = NFS4_OPEN_DELEGATE_NONE; 2621 open->op_recall = 0; 2622 switch (open->op_claim_type) { 2623 case NFS4_OPEN_CLAIM_PREVIOUS: 2624 if (!cb_up) 2625 open->op_recall = 1; 2626 flag = open->op_delegate_type; 2627 if (flag == NFS4_OPEN_DELEGATE_NONE) 2628 goto out; 2629 break; 2630 case NFS4_OPEN_CLAIM_NULL: 2631 /* Let's not give out any delegations till everyone's 2632 * had the chance to reclaim theirs.... */ 2633 if (locks_in_grace()) 2634 goto out; 2635 if (!cb_up || !sop->so_confirmed) 2636 goto out; 2637 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) 2638 flag = NFS4_OPEN_DELEGATE_WRITE; 2639 else 2640 flag = NFS4_OPEN_DELEGATE_READ; 2641 break; 2642 default: 2643 goto out; 2644 } 2645 2646 dp = alloc_init_deleg(sop->so_client, stp, fh, flag); 2647 if (dp == NULL) { 2648 flag = NFS4_OPEN_DELEGATE_NONE; 2649 goto out; 2650 } 2651 status = -ENOMEM; 2652 fl = locks_alloc_lock(); 2653 if (!fl) 2654 goto out; 2655 locks_init_lock(fl); 2656 fl->fl_lmops = &nfsd_lease_mng_ops; 2657 fl->fl_flags = FL_LEASE; 2658 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; 2659 fl->fl_end = OFFSET_MAX; 2660 fl->fl_owner = (fl_owner_t)dp; 2661 fl->fl_file = find_readable_file(stp->st_file); 2662 BUG_ON(!fl->fl_file); 2663 fl->fl_pid = current->tgid; 2664 2665 /* vfs_setlease checks to see if delegation should be handed out. 2666 * the lock_manager callbacks fl_mylease and fl_change are used 2667 */ 2668 if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) { 2669 dprintk("NFSD: setlease failed [%d], no delegation\n", status); 2670 unhash_delegation(dp); 2671 flag = NFS4_OPEN_DELEGATE_NONE; 2672 goto out; 2673 } 2674 2675 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); 2676 2677 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n", 2678 STATEID_VAL(&dp->dl_stateid)); 2679 out: 2680 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS 2681 && flag == NFS4_OPEN_DELEGATE_NONE 2682 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) 2683 dprintk("NFSD: WARNING: refusing delegation reclaim\n"); 2684 open->op_delegate_type = flag; 2685 } 2686 2687 /* 2688 * called with nfs4_lock_state() held. 2689 */ 2690 __be32 2691 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) 2692 { 2693 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2694 struct nfs4_file *fp = NULL; 2695 struct inode *ino = current_fh->fh_dentry->d_inode; 2696 struct nfs4_stateid *stp = NULL; 2697 struct nfs4_delegation *dp = NULL; 2698 __be32 status; 2699 2700 status = nfserr_inval; 2701 if (!access_valid(open->op_share_access, resp->cstate.minorversion) 2702 || !deny_valid(open->op_share_deny)) 2703 goto out; 2704 /* 2705 * Lookup file; if found, lookup stateid and check open request, 2706 * and check for delegations in the process of being recalled. 2707 * If not found, create the nfs4_file struct 2708 */ 2709 fp = find_file(ino); 2710 if (fp) { 2711 if ((status = nfs4_check_open(fp, open, &stp))) 2712 goto out; 2713 status = nfs4_check_deleg(fp, open, &dp); 2714 if (status) 2715 goto out; 2716 } else { 2717 status = nfserr_bad_stateid; 2718 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) 2719 goto out; 2720 status = nfserr_resource; 2721 fp = alloc_init_file(ino); 2722 if (fp == NULL) 2723 goto out; 2724 } 2725 2726 /* 2727 * OPEN the file, or upgrade an existing OPEN. 2728 * If truncate fails, the OPEN fails. 2729 */ 2730 if (stp) { 2731 /* Stateid was found, this is an OPEN upgrade */ 2732 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); 2733 if (status) 2734 goto out; 2735 update_stateid(&stp->st_stateid); 2736 } else { 2737 status = nfs4_new_open(rqstp, &stp, fp, current_fh, open); 2738 if (status) 2739 goto out; 2740 init_stateid(stp, fp, open); 2741 status = nfsd4_truncate(rqstp, current_fh, open); 2742 if (status) { 2743 release_open_stateid(stp); 2744 goto out; 2745 } 2746 if (nfsd4_has_session(&resp->cstate)) 2747 update_stateid(&stp->st_stateid); 2748 } 2749 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); 2750 2751 if (nfsd4_has_session(&resp->cstate)) 2752 open->op_stateowner->so_confirmed = 1; 2753 2754 /* 2755 * Attempt to hand out a delegation. No error return, because the 2756 * OPEN succeeds even if we fail. 2757 */ 2758 nfs4_open_delegation(current_fh, open, stp); 2759 2760 status = nfs_ok; 2761 2762 dprintk("%s: stateid=" STATEID_FMT "\n", __func__, 2763 STATEID_VAL(&stp->st_stateid)); 2764 out: 2765 if (fp) 2766 put_nfs4_file(fp); 2767 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) 2768 nfs4_set_claim_prev(open); 2769 /* 2770 * To finish the open response, we just need to set the rflags. 2771 */ 2772 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; 2773 if (!open->op_stateowner->so_confirmed && 2774 !nfsd4_has_session(&resp->cstate)) 2775 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; 2776 2777 return status; 2778 } 2779 2780 __be32 2781 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 2782 clientid_t *clid) 2783 { 2784 struct nfs4_client *clp; 2785 __be32 status; 2786 2787 nfs4_lock_state(); 2788 dprintk("process_renew(%08x/%08x): starting\n", 2789 clid->cl_boot, clid->cl_id); 2790 status = nfserr_stale_clientid; 2791 if (STALE_CLIENTID(clid)) 2792 goto out; 2793 clp = find_confirmed_client(clid); 2794 status = nfserr_expired; 2795 if (clp == NULL) { 2796 /* We assume the client took too long to RENEW. */ 2797 dprintk("nfsd4_renew: clientid not found!\n"); 2798 goto out; 2799 } 2800 renew_client(clp); 2801 status = nfserr_cb_path_down; 2802 if (!list_empty(&clp->cl_delegations) 2803 && !atomic_read(&clp->cl_cb_set)) 2804 goto out; 2805 status = nfs_ok; 2806 out: 2807 nfs4_unlock_state(); 2808 return status; 2809 } 2810 2811 struct lock_manager nfsd4_manager = { 2812 }; 2813 2814 static void 2815 nfsd4_end_grace(void) 2816 { 2817 dprintk("NFSD: end of grace period\n"); 2818 nfsd4_recdir_purge_old(); 2819 locks_end_grace(&nfsd4_manager); 2820 /* 2821 * Now that every NFSv4 client has had the chance to recover and 2822 * to see the (possibly new, possibly shorter) lease time, we 2823 * can safely set the next grace time to the current lease time: 2824 */ 2825 nfsd4_grace = nfsd4_lease; 2826 } 2827 2828 static time_t 2829 nfs4_laundromat(void) 2830 { 2831 struct nfs4_client *clp; 2832 struct nfs4_stateowner *sop; 2833 struct nfs4_delegation *dp; 2834 struct list_head *pos, *next, reaplist; 2835 time_t cutoff = get_seconds() - nfsd4_lease; 2836 time_t t, clientid_val = nfsd4_lease; 2837 time_t u, test_val = nfsd4_lease; 2838 2839 nfs4_lock_state(); 2840 2841 dprintk("NFSD: laundromat service - starting\n"); 2842 if (locks_in_grace()) 2843 nfsd4_end_grace(); 2844 INIT_LIST_HEAD(&reaplist); 2845 spin_lock(&client_lock); 2846 list_for_each_safe(pos, next, &client_lru) { 2847 clp = list_entry(pos, struct nfs4_client, cl_lru); 2848 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { 2849 t = clp->cl_time - cutoff; 2850 if (clientid_val > t) 2851 clientid_val = t; 2852 break; 2853 } 2854 if (atomic_read(&clp->cl_refcount)) { 2855 dprintk("NFSD: client in use (clientid %08x)\n", 2856 clp->cl_clientid.cl_id); 2857 continue; 2858 } 2859 unhash_client_locked(clp); 2860 list_add(&clp->cl_lru, &reaplist); 2861 } 2862 spin_unlock(&client_lock); 2863 list_for_each_safe(pos, next, &reaplist) { 2864 clp = list_entry(pos, struct nfs4_client, cl_lru); 2865 dprintk("NFSD: purging unused client (clientid %08x)\n", 2866 clp->cl_clientid.cl_id); 2867 nfsd4_remove_clid_dir(clp); 2868 expire_client(clp); 2869 } 2870 spin_lock(&recall_lock); 2871 list_for_each_safe(pos, next, &del_recall_lru) { 2872 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 2873 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { 2874 u = dp->dl_time - cutoff; 2875 if (test_val > u) 2876 test_val = u; 2877 break; 2878 } 2879 dprintk("NFSD: purging unused delegation dp %p, fp %p\n", 2880 dp, dp->dl_flock); 2881 list_move(&dp->dl_recall_lru, &reaplist); 2882 } 2883 spin_unlock(&recall_lock); 2884 list_for_each_safe(pos, next, &reaplist) { 2885 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 2886 list_del_init(&dp->dl_recall_lru); 2887 unhash_delegation(dp); 2888 } 2889 test_val = nfsd4_lease; 2890 list_for_each_safe(pos, next, &close_lru) { 2891 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); 2892 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { 2893 u = sop->so_time - cutoff; 2894 if (test_val > u) 2895 test_val = u; 2896 break; 2897 } 2898 dprintk("NFSD: purging unused open stateowner (so_id %d)\n", 2899 sop->so_id); 2900 release_openowner(sop); 2901 } 2902 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) 2903 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; 2904 nfs4_unlock_state(); 2905 return clientid_val; 2906 } 2907 2908 static struct workqueue_struct *laundry_wq; 2909 static void laundromat_main(struct work_struct *); 2910 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); 2911 2912 static void 2913 laundromat_main(struct work_struct *not_used) 2914 { 2915 time_t t; 2916 2917 t = nfs4_laundromat(); 2918 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); 2919 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); 2920 } 2921 2922 static struct nfs4_stateowner * 2923 search_close_lru(u32 st_id, int flags) 2924 { 2925 struct nfs4_stateowner *local = NULL; 2926 2927 if (flags & CLOSE_STATE) { 2928 list_for_each_entry(local, &close_lru, so_close_lru) { 2929 if (local->so_id == st_id) 2930 return local; 2931 } 2932 } 2933 return NULL; 2934 } 2935 2936 static inline int 2937 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) 2938 { 2939 return fhp->fh_dentry->d_inode != stp->st_file->fi_inode; 2940 } 2941 2942 static int 2943 STALE_STATEID(stateid_t *stateid) 2944 { 2945 if (stateid->si_boot == boot_time) 2946 return 0; 2947 dprintk("NFSD: stale stateid " STATEID_FMT "!\n", 2948 STATEID_VAL(stateid)); 2949 return 1; 2950 } 2951 2952 static inline int 2953 access_permit_read(unsigned long access_bmap) 2954 { 2955 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) || 2956 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) || 2957 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap); 2958 } 2959 2960 static inline int 2961 access_permit_write(unsigned long access_bmap) 2962 { 2963 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) || 2964 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap); 2965 } 2966 2967 static 2968 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags) 2969 { 2970 __be32 status = nfserr_openmode; 2971 2972 /* For lock stateid's, we test the parent open, not the lock: */ 2973 if (stp->st_openstp) 2974 stp = stp->st_openstp; 2975 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) 2976 goto out; 2977 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) 2978 goto out; 2979 status = nfs_ok; 2980 out: 2981 return status; 2982 } 2983 2984 static inline __be32 2985 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) 2986 { 2987 if (ONE_STATEID(stateid) && (flags & RD_STATE)) 2988 return nfs_ok; 2989 else if (locks_in_grace()) { 2990 /* Answer in remaining cases depends on existance of 2991 * conflicting state; so we must wait out the grace period. */ 2992 return nfserr_grace; 2993 } else if (flags & WR_STATE) 2994 return nfs4_share_conflict(current_fh, 2995 NFS4_SHARE_DENY_WRITE); 2996 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ 2997 return nfs4_share_conflict(current_fh, 2998 NFS4_SHARE_DENY_READ); 2999 } 3000 3001 /* 3002 * Allow READ/WRITE during grace period on recovered state only for files 3003 * that are not able to provide mandatory locking. 3004 */ 3005 static inline int 3006 grace_disallows_io(struct inode *inode) 3007 { 3008 return locks_in_grace() && mandatory_lock(inode); 3009 } 3010 3011 static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags) 3012 { 3013 /* 3014 * When sessions are used the stateid generation number is ignored 3015 * when it is zero. 3016 */ 3017 if ((flags & HAS_SESSION) && in->si_generation == 0) 3018 goto out; 3019 3020 /* If the client sends us a stateid from the future, it's buggy: */ 3021 if (in->si_generation > ref->si_generation) 3022 return nfserr_bad_stateid; 3023 /* 3024 * The following, however, can happen. For example, if the 3025 * client sends an open and some IO at the same time, the open 3026 * may bump si_generation while the IO is still in flight. 3027 * Thanks to hard links and renames, the client never knows what 3028 * file an open will affect. So it could avoid that situation 3029 * only by serializing all opens and IO from the same open 3030 * owner. To recover from the old_stateid error, the client 3031 * will just have to retry the IO: 3032 */ 3033 if (in->si_generation < ref->si_generation) 3034 return nfserr_old_stateid; 3035 out: 3036 return nfs_ok; 3037 } 3038 3039 static int is_delegation_stateid(stateid_t *stateid) 3040 { 3041 return stateid->si_fileid == 0; 3042 } 3043 3044 /* 3045 * Checks for stateid operations 3046 */ 3047 __be32 3048 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate, 3049 stateid_t *stateid, int flags, struct file **filpp) 3050 { 3051 struct nfs4_stateid *stp = NULL; 3052 struct nfs4_delegation *dp = NULL; 3053 struct svc_fh *current_fh = &cstate->current_fh; 3054 struct inode *ino = current_fh->fh_dentry->d_inode; 3055 __be32 status; 3056 3057 if (filpp) 3058 *filpp = NULL; 3059 3060 if (grace_disallows_io(ino)) 3061 return nfserr_grace; 3062 3063 if (nfsd4_has_session(cstate)) 3064 flags |= HAS_SESSION; 3065 3066 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 3067 return check_special_stateids(current_fh, stateid, flags); 3068 3069 status = nfserr_stale_stateid; 3070 if (STALE_STATEID(stateid)) 3071 goto out; 3072 3073 /* 3074 * We assume that any stateid that has the current boot time, 3075 * but that we can't find, is expired: 3076 */ 3077 status = nfserr_expired; 3078 if (is_delegation_stateid(stateid)) { 3079 dp = find_delegation_stateid(ino, stateid); 3080 if (!dp) 3081 goto out; 3082 status = check_stateid_generation(stateid, &dp->dl_stateid, 3083 flags); 3084 if (status) 3085 goto out; 3086 status = nfs4_check_delegmode(dp, flags); 3087 if (status) 3088 goto out; 3089 renew_client(dp->dl_client); 3090 if (filpp) 3091 *filpp = find_readable_file(dp->dl_file); 3092 BUG_ON(!*filpp); 3093 } else { /* open or lock stateid */ 3094 stp = find_stateid(stateid, flags); 3095 if (!stp) 3096 goto out; 3097 status = nfserr_bad_stateid; 3098 if (nfs4_check_fh(current_fh, stp)) 3099 goto out; 3100 if (!stp->st_stateowner->so_confirmed) 3101 goto out; 3102 status = check_stateid_generation(stateid, &stp->st_stateid, 3103 flags); 3104 if (status) 3105 goto out; 3106 status = nfs4_check_openmode(stp, flags); 3107 if (status) 3108 goto out; 3109 renew_client(stp->st_stateowner->so_client); 3110 if (filpp) { 3111 if (flags & RD_STATE) 3112 *filpp = find_readable_file(stp->st_file); 3113 else 3114 *filpp = find_writeable_file(stp->st_file); 3115 } 3116 } 3117 status = nfs_ok; 3118 out: 3119 return status; 3120 } 3121 3122 static inline int 3123 setlkflg (int type) 3124 { 3125 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? 3126 RD_STATE : WR_STATE; 3127 } 3128 3129 /* 3130 * Checks for sequence id mutating operations. 3131 */ 3132 static __be32 3133 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, 3134 stateid_t *stateid, int flags, 3135 struct nfs4_stateowner **sopp, 3136 struct nfs4_stateid **stpp, struct nfsd4_lock *lock) 3137 { 3138 struct nfs4_stateid *stp; 3139 struct nfs4_stateowner *sop; 3140 struct svc_fh *current_fh = &cstate->current_fh; 3141 __be32 status; 3142 3143 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, 3144 seqid, STATEID_VAL(stateid)); 3145 3146 *stpp = NULL; 3147 *sopp = NULL; 3148 3149 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { 3150 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n"); 3151 return nfserr_bad_stateid; 3152 } 3153 3154 if (STALE_STATEID(stateid)) 3155 return nfserr_stale_stateid; 3156 3157 if (nfsd4_has_session(cstate)) 3158 flags |= HAS_SESSION; 3159 3160 /* 3161 * We return BAD_STATEID if filehandle doesn't match stateid, 3162 * the confirmed flag is incorrecly set, or the generation 3163 * number is incorrect. 3164 */ 3165 stp = find_stateid(stateid, flags); 3166 if (stp == NULL) { 3167 /* 3168 * Also, we should make sure this isn't just the result of 3169 * a replayed close: 3170 */ 3171 sop = search_close_lru(stateid->si_stateownerid, flags); 3172 /* It's not stale; let's assume it's expired: */ 3173 if (sop == NULL) 3174 return nfserr_expired; 3175 *sopp = sop; 3176 goto check_replay; 3177 } 3178 3179 *stpp = stp; 3180 *sopp = sop = stp->st_stateowner; 3181 3182 if (lock) { 3183 clientid_t *lockclid = &lock->v.new.clientid; 3184 struct nfs4_client *clp = sop->so_client; 3185 int lkflg = 0; 3186 __be32 status; 3187 3188 lkflg = setlkflg(lock->lk_type); 3189 3190 if (lock->lk_is_new) { 3191 if (!sop->so_is_open_owner) 3192 return nfserr_bad_stateid; 3193 if (!(flags & HAS_SESSION) && 3194 !same_clid(&clp->cl_clientid, lockclid)) 3195 return nfserr_bad_stateid; 3196 /* stp is the open stateid */ 3197 status = nfs4_check_openmode(stp, lkflg); 3198 if (status) 3199 return status; 3200 } else { 3201 /* stp is the lock stateid */ 3202 status = nfs4_check_openmode(stp->st_openstp, lkflg); 3203 if (status) 3204 return status; 3205 } 3206 } 3207 3208 if (nfs4_check_fh(current_fh, stp)) { 3209 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); 3210 return nfserr_bad_stateid; 3211 } 3212 3213 /* 3214 * We now validate the seqid and stateid generation numbers. 3215 * For the moment, we ignore the possibility of 3216 * generation number wraparound. 3217 */ 3218 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid) 3219 goto check_replay; 3220 3221 if (sop->so_confirmed && flags & CONFIRM) { 3222 dprintk("NFSD: preprocess_seqid_op: expected" 3223 " unconfirmed stateowner!\n"); 3224 return nfserr_bad_stateid; 3225 } 3226 if (!sop->so_confirmed && !(flags & CONFIRM)) { 3227 dprintk("NFSD: preprocess_seqid_op: stateowner not" 3228 " confirmed yet!\n"); 3229 return nfserr_bad_stateid; 3230 } 3231 status = check_stateid_generation(stateid, &stp->st_stateid, flags); 3232 if (status) 3233 return status; 3234 renew_client(sop->so_client); 3235 return nfs_ok; 3236 3237 check_replay: 3238 if (seqid == sop->so_seqid - 1) { 3239 dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); 3240 /* indicate replay to calling function */ 3241 return nfserr_replay_me; 3242 } 3243 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", 3244 sop->so_seqid, seqid); 3245 *sopp = NULL; 3246 return nfserr_bad_seqid; 3247 } 3248 3249 __be32 3250 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3251 struct nfsd4_open_confirm *oc) 3252 { 3253 __be32 status; 3254 struct nfs4_stateowner *sop; 3255 struct nfs4_stateid *stp; 3256 3257 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", 3258 (int)cstate->current_fh.fh_dentry->d_name.len, 3259 cstate->current_fh.fh_dentry->d_name.name); 3260 3261 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); 3262 if (status) 3263 return status; 3264 3265 nfs4_lock_state(); 3266 3267 if ((status = nfs4_preprocess_seqid_op(cstate, 3268 oc->oc_seqid, &oc->oc_req_stateid, 3269 CONFIRM | OPEN_STATE, 3270 &oc->oc_stateowner, &stp, NULL))) 3271 goto out; 3272 3273 sop = oc->oc_stateowner; 3274 sop->so_confirmed = 1; 3275 update_stateid(&stp->st_stateid); 3276 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); 3277 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", 3278 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid)); 3279 3280 nfsd4_create_clid_dir(sop->so_client); 3281 out: 3282 if (oc->oc_stateowner) { 3283 nfs4_get_stateowner(oc->oc_stateowner); 3284 cstate->replay_owner = oc->oc_stateowner; 3285 } 3286 nfs4_unlock_state(); 3287 return status; 3288 } 3289 3290 3291 /* 3292 * unset all bits in union bitmap (bmap) that 3293 * do not exist in share (from successful OPEN_DOWNGRADE) 3294 */ 3295 static void 3296 reset_union_bmap_access(unsigned long access, unsigned long *bmap) 3297 { 3298 int i; 3299 for (i = 1; i < 4; i++) { 3300 if ((i & access) != i) 3301 __clear_bit(i, bmap); 3302 } 3303 } 3304 3305 static void 3306 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) 3307 { 3308 int i; 3309 for (i = 0; i < 4; i++) { 3310 if ((i & deny) != i) 3311 __clear_bit(i, bmap); 3312 } 3313 } 3314 3315 __be32 3316 nfsd4_open_downgrade(struct svc_rqst *rqstp, 3317 struct nfsd4_compound_state *cstate, 3318 struct nfsd4_open_downgrade *od) 3319 { 3320 __be32 status; 3321 struct nfs4_stateid *stp; 3322 unsigned int share_access; 3323 3324 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 3325 (int)cstate->current_fh.fh_dentry->d_name.len, 3326 cstate->current_fh.fh_dentry->d_name.name); 3327 3328 if (!access_valid(od->od_share_access, cstate->minorversion) 3329 || !deny_valid(od->od_share_deny)) 3330 return nfserr_inval; 3331 3332 nfs4_lock_state(); 3333 if ((status = nfs4_preprocess_seqid_op(cstate, 3334 od->od_seqid, 3335 &od->od_stateid, 3336 OPEN_STATE, 3337 &od->od_stateowner, &stp, NULL))) 3338 goto out; 3339 3340 status = nfserr_inval; 3341 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { 3342 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", 3343 stp->st_access_bmap, od->od_share_access); 3344 goto out; 3345 } 3346 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { 3347 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", 3348 stp->st_deny_bmap, od->od_share_deny); 3349 goto out; 3350 } 3351 set_access(&share_access, stp->st_access_bmap); 3352 nfs4_file_downgrade(stp->st_file, share_access & ~od->od_share_access); 3353 3354 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); 3355 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); 3356 3357 update_stateid(&stp->st_stateid); 3358 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); 3359 status = nfs_ok; 3360 out: 3361 if (od->od_stateowner) { 3362 nfs4_get_stateowner(od->od_stateowner); 3363 cstate->replay_owner = od->od_stateowner; 3364 } 3365 nfs4_unlock_state(); 3366 return status; 3367 } 3368 3369 /* 3370 * nfs4_unlock_state() called after encode 3371 */ 3372 __be32 3373 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3374 struct nfsd4_close *close) 3375 { 3376 __be32 status; 3377 struct nfs4_stateid *stp; 3378 3379 dprintk("NFSD: nfsd4_close on file %.*s\n", 3380 (int)cstate->current_fh.fh_dentry->d_name.len, 3381 cstate->current_fh.fh_dentry->d_name.name); 3382 3383 nfs4_lock_state(); 3384 /* check close_lru for replay */ 3385 if ((status = nfs4_preprocess_seqid_op(cstate, 3386 close->cl_seqid, 3387 &close->cl_stateid, 3388 OPEN_STATE | CLOSE_STATE, 3389 &close->cl_stateowner, &stp, NULL))) 3390 goto out; 3391 status = nfs_ok; 3392 update_stateid(&stp->st_stateid); 3393 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); 3394 3395 /* release_stateid() calls nfsd_close() if needed */ 3396 release_open_stateid(stp); 3397 3398 /* place unused nfs4_stateowners on so_close_lru list to be 3399 * released by the laundromat service after the lease period 3400 * to enable us to handle CLOSE replay 3401 */ 3402 if (list_empty(&close->cl_stateowner->so_stateids)) 3403 move_to_close_lru(close->cl_stateowner); 3404 out: 3405 if (close->cl_stateowner) { 3406 nfs4_get_stateowner(close->cl_stateowner); 3407 cstate->replay_owner = close->cl_stateowner; 3408 } 3409 nfs4_unlock_state(); 3410 return status; 3411 } 3412 3413 __be32 3414 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3415 struct nfsd4_delegreturn *dr) 3416 { 3417 struct nfs4_delegation *dp; 3418 stateid_t *stateid = &dr->dr_stateid; 3419 struct inode *inode; 3420 __be32 status; 3421 int flags = 0; 3422 3423 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) 3424 return status; 3425 inode = cstate->current_fh.fh_dentry->d_inode; 3426 3427 if (nfsd4_has_session(cstate)) 3428 flags |= HAS_SESSION; 3429 nfs4_lock_state(); 3430 status = nfserr_bad_stateid; 3431 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) 3432 goto out; 3433 status = nfserr_stale_stateid; 3434 if (STALE_STATEID(stateid)) 3435 goto out; 3436 status = nfserr_bad_stateid; 3437 if (!is_delegation_stateid(stateid)) 3438 goto out; 3439 status = nfserr_expired; 3440 dp = find_delegation_stateid(inode, stateid); 3441 if (!dp) 3442 goto out; 3443 status = check_stateid_generation(stateid, &dp->dl_stateid, flags); 3444 if (status) 3445 goto out; 3446 renew_client(dp->dl_client); 3447 3448 unhash_delegation(dp); 3449 out: 3450 nfs4_unlock_state(); 3451 3452 return status; 3453 } 3454 3455 3456 /* 3457 * Lock owner state (byte-range locks) 3458 */ 3459 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) 3460 #define LOCK_HASH_BITS 8 3461 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) 3462 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) 3463 3464 static inline u64 3465 end_offset(u64 start, u64 len) 3466 { 3467 u64 end; 3468 3469 end = start + len; 3470 return end >= start ? end: NFS4_MAX_UINT64; 3471 } 3472 3473 /* last octet in a range */ 3474 static inline u64 3475 last_byte_offset(u64 start, u64 len) 3476 { 3477 u64 end; 3478 3479 BUG_ON(!len); 3480 end = start + len; 3481 return end > start ? end - 1: NFS4_MAX_UINT64; 3482 } 3483 3484 #define lockownerid_hashval(id) \ 3485 ((id) & LOCK_HASH_MASK) 3486 3487 static inline unsigned int 3488 lock_ownerstr_hashval(struct inode *inode, u32 cl_id, 3489 struct xdr_netobj *ownername) 3490 { 3491 return (file_hashval(inode) + cl_id 3492 + opaque_hashval(ownername->data, ownername->len)) 3493 & LOCK_HASH_MASK; 3494 } 3495 3496 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 3497 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; 3498 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; 3499 3500 static struct nfs4_stateid * 3501 find_stateid(stateid_t *stid, int flags) 3502 { 3503 struct nfs4_stateid *local; 3504 u32 st_id = stid->si_stateownerid; 3505 u32 f_id = stid->si_fileid; 3506 unsigned int hashval; 3507 3508 dprintk("NFSD: find_stateid flags 0x%x\n",flags); 3509 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) { 3510 hashval = stateid_hashval(st_id, f_id); 3511 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { 3512 if ((local->st_stateid.si_stateownerid == st_id) && 3513 (local->st_stateid.si_fileid == f_id)) 3514 return local; 3515 } 3516 } 3517 3518 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) { 3519 hashval = stateid_hashval(st_id, f_id); 3520 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { 3521 if ((local->st_stateid.si_stateownerid == st_id) && 3522 (local->st_stateid.si_fileid == f_id)) 3523 return local; 3524 } 3525 } 3526 return NULL; 3527 } 3528 3529 static struct nfs4_delegation * 3530 find_delegation_stateid(struct inode *ino, stateid_t *stid) 3531 { 3532 struct nfs4_file *fp; 3533 struct nfs4_delegation *dl; 3534 3535 dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__, 3536 STATEID_VAL(stid)); 3537 3538 fp = find_file(ino); 3539 if (!fp) 3540 return NULL; 3541 dl = find_delegation_file(fp, stid); 3542 put_nfs4_file(fp); 3543 return dl; 3544 } 3545 3546 /* 3547 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that 3548 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th 3549 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit 3550 * locking, this prevents us from being completely protocol-compliant. The 3551 * real solution to this problem is to start using unsigned file offsets in 3552 * the VFS, but this is a very deep change! 3553 */ 3554 static inline void 3555 nfs4_transform_lock_offset(struct file_lock *lock) 3556 { 3557 if (lock->fl_start < 0) 3558 lock->fl_start = OFFSET_MAX; 3559 if (lock->fl_end < 0) 3560 lock->fl_end = OFFSET_MAX; 3561 } 3562 3563 /* Hack!: For now, we're defining this just so we can use a pointer to it 3564 * as a unique cookie to identify our (NFSv4's) posix locks. */ 3565 static const struct lock_manager_operations nfsd_posix_mng_ops = { 3566 }; 3567 3568 static inline void 3569 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) 3570 { 3571 struct nfs4_stateowner *sop; 3572 3573 if (fl->fl_lmops == &nfsd_posix_mng_ops) { 3574 sop = (struct nfs4_stateowner *) fl->fl_owner; 3575 kref_get(&sop->so_ref); 3576 deny->ld_sop = sop; 3577 deny->ld_clientid = sop->so_client->cl_clientid; 3578 } else { 3579 deny->ld_sop = NULL; 3580 deny->ld_clientid.cl_boot = 0; 3581 deny->ld_clientid.cl_id = 0; 3582 } 3583 deny->ld_start = fl->fl_start; 3584 deny->ld_length = NFS4_MAX_UINT64; 3585 if (fl->fl_end != NFS4_MAX_UINT64) 3586 deny->ld_length = fl->fl_end - fl->fl_start + 1; 3587 deny->ld_type = NFS4_READ_LT; 3588 if (fl->fl_type != F_RDLCK) 3589 deny->ld_type = NFS4_WRITE_LT; 3590 } 3591 3592 static struct nfs4_stateowner * 3593 find_lockstateowner_str(struct inode *inode, clientid_t *clid, 3594 struct xdr_netobj *owner) 3595 { 3596 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); 3597 struct nfs4_stateowner *op; 3598 3599 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { 3600 if (same_owner_str(op, owner, clid)) 3601 return op; 3602 } 3603 return NULL; 3604 } 3605 3606 /* 3607 * Alloc a lock owner structure. 3608 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 3609 * occured. 3610 * 3611 * strhashval = lock_ownerstr_hashval 3612 */ 3613 3614 static struct nfs4_stateowner * 3615 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { 3616 struct nfs4_stateowner *sop; 3617 struct nfs4_replay *rp; 3618 unsigned int idhashval; 3619 3620 if (!(sop = alloc_stateowner(&lock->lk_new_owner))) 3621 return NULL; 3622 idhashval = lockownerid_hashval(current_ownerid); 3623 INIT_LIST_HEAD(&sop->so_idhash); 3624 INIT_LIST_HEAD(&sop->so_strhash); 3625 INIT_LIST_HEAD(&sop->so_perclient); 3626 INIT_LIST_HEAD(&sop->so_stateids); 3627 INIT_LIST_HEAD(&sop->so_perstateid); 3628 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ 3629 sop->so_time = 0; 3630 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); 3631 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); 3632 list_add(&sop->so_perstateid, &open_stp->st_lockowners); 3633 sop->so_is_open_owner = 0; 3634 sop->so_id = current_ownerid++; 3635 sop->so_client = clp; 3636 /* It is the openowner seqid that will be incremented in encode in the 3637 * case of new lockowners; so increment the lock seqid manually: */ 3638 sop->so_seqid = lock->lk_new_lock_seqid + 1; 3639 sop->so_confirmed = 1; 3640 rp = &sop->so_replay; 3641 rp->rp_status = nfserr_serverfault; 3642 rp->rp_buflen = 0; 3643 rp->rp_buf = rp->rp_ibuf; 3644 return sop; 3645 } 3646 3647 static struct nfs4_stateid * 3648 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) 3649 { 3650 struct nfs4_stateid *stp; 3651 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); 3652 3653 stp = nfs4_alloc_stateid(); 3654 if (stp == NULL) 3655 goto out; 3656 INIT_LIST_HEAD(&stp->st_hash); 3657 INIT_LIST_HEAD(&stp->st_perfile); 3658 INIT_LIST_HEAD(&stp->st_perstateowner); 3659 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ 3660 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); 3661 list_add(&stp->st_perfile, &fp->fi_stateids); 3662 list_add(&stp->st_perstateowner, &sop->so_stateids); 3663 stp->st_stateowner = sop; 3664 get_nfs4_file(fp); 3665 stp->st_file = fp; 3666 stp->st_stateid.si_boot = boot_time; 3667 stp->st_stateid.si_stateownerid = sop->so_id; 3668 stp->st_stateid.si_fileid = fp->fi_id; 3669 stp->st_stateid.si_generation = 0; 3670 stp->st_deny_bmap = open_stp->st_deny_bmap; 3671 stp->st_openstp = open_stp; 3672 3673 out: 3674 return stp; 3675 } 3676 3677 static int 3678 check_lock_length(u64 offset, u64 length) 3679 { 3680 return ((length == 0) || ((length != NFS4_MAX_UINT64) && 3681 LOFF_OVERFLOW(offset, length))); 3682 } 3683 3684 /* 3685 * LOCK operation 3686 */ 3687 __be32 3688 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3689 struct nfsd4_lock *lock) 3690 { 3691 struct nfs4_stateowner *open_sop = NULL; 3692 struct nfs4_stateowner *lock_sop = NULL; 3693 struct nfs4_stateid *lock_stp; 3694 struct nfs4_file *fp; 3695 struct file *filp = NULL; 3696 struct file_lock file_lock; 3697 struct file_lock conflock; 3698 __be32 status = 0; 3699 unsigned int strhashval; 3700 unsigned int cmd; 3701 int err; 3702 3703 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", 3704 (long long) lock->lk_offset, 3705 (long long) lock->lk_length); 3706 3707 if (check_lock_length(lock->lk_offset, lock->lk_length)) 3708 return nfserr_inval; 3709 3710 if ((status = fh_verify(rqstp, &cstate->current_fh, 3711 S_IFREG, NFSD_MAY_LOCK))) { 3712 dprintk("NFSD: nfsd4_lock: permission denied!\n"); 3713 return status; 3714 } 3715 3716 nfs4_lock_state(); 3717 3718 if (lock->lk_is_new) { 3719 /* 3720 * Client indicates that this is a new lockowner. 3721 * Use open owner and open stateid to create lock owner and 3722 * lock stateid. 3723 */ 3724 struct nfs4_stateid *open_stp = NULL; 3725 3726 status = nfserr_stale_clientid; 3727 if (!nfsd4_has_session(cstate) && 3728 STALE_CLIENTID(&lock->lk_new_clientid)) 3729 goto out; 3730 3731 /* validate and update open stateid and open seqid */ 3732 status = nfs4_preprocess_seqid_op(cstate, 3733 lock->lk_new_open_seqid, 3734 &lock->lk_new_open_stateid, 3735 OPEN_STATE, 3736 &lock->lk_replay_owner, &open_stp, 3737 lock); 3738 if (status) 3739 goto out; 3740 open_sop = lock->lk_replay_owner; 3741 /* create lockowner and lock stateid */ 3742 fp = open_stp->st_file; 3743 strhashval = lock_ownerstr_hashval(fp->fi_inode, 3744 open_sop->so_client->cl_clientid.cl_id, 3745 &lock->v.new.owner); 3746 /* XXX: Do we need to check for duplicate stateowners on 3747 * the same file, or should they just be allowed (and 3748 * create new stateids)? */ 3749 status = nfserr_resource; 3750 lock_sop = alloc_init_lock_stateowner(strhashval, 3751 open_sop->so_client, open_stp, lock); 3752 if (lock_sop == NULL) 3753 goto out; 3754 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); 3755 if (lock_stp == NULL) 3756 goto out; 3757 } else { 3758 /* lock (lock owner + lock stateid) already exists */ 3759 status = nfs4_preprocess_seqid_op(cstate, 3760 lock->lk_old_lock_seqid, 3761 &lock->lk_old_lock_stateid, 3762 LOCK_STATE, 3763 &lock->lk_replay_owner, &lock_stp, lock); 3764 if (status) 3765 goto out; 3766 lock_sop = lock->lk_replay_owner; 3767 fp = lock_stp->st_file; 3768 } 3769 /* lock->lk_replay_owner and lock_stp have been created or found */ 3770 3771 status = nfserr_grace; 3772 if (locks_in_grace() && !lock->lk_reclaim) 3773 goto out; 3774 status = nfserr_no_grace; 3775 if (!locks_in_grace() && lock->lk_reclaim) 3776 goto out; 3777 3778 locks_init_lock(&file_lock); 3779 switch (lock->lk_type) { 3780 case NFS4_READ_LT: 3781 case NFS4_READW_LT: 3782 if (find_readable_file(lock_stp->st_file)) { 3783 nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_READ); 3784 filp = find_readable_file(lock_stp->st_file); 3785 } 3786 file_lock.fl_type = F_RDLCK; 3787 cmd = F_SETLK; 3788 break; 3789 case NFS4_WRITE_LT: 3790 case NFS4_WRITEW_LT: 3791 if (find_writeable_file(lock_stp->st_file)) { 3792 nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_WRITE); 3793 filp = find_writeable_file(lock_stp->st_file); 3794 } 3795 file_lock.fl_type = F_WRLCK; 3796 cmd = F_SETLK; 3797 break; 3798 default: 3799 status = nfserr_inval; 3800 goto out; 3801 } 3802 if (!filp) { 3803 status = nfserr_openmode; 3804 goto out; 3805 } 3806 file_lock.fl_owner = (fl_owner_t)lock_sop; 3807 file_lock.fl_pid = current->tgid; 3808 file_lock.fl_file = filp; 3809 file_lock.fl_flags = FL_POSIX; 3810 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3811 3812 file_lock.fl_start = lock->lk_offset; 3813 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); 3814 nfs4_transform_lock_offset(&file_lock); 3815 3816 /* 3817 * Try to lock the file in the VFS. 3818 * Note: locks.c uses the BKL to protect the inode's lock list. 3819 */ 3820 3821 err = vfs_lock_file(filp, cmd, &file_lock, &conflock); 3822 switch (-err) { 3823 case 0: /* success! */ 3824 update_stateid(&lock_stp->st_stateid); 3825 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 3826 sizeof(stateid_t)); 3827 status = 0; 3828 break; 3829 case (EAGAIN): /* conflock holds conflicting lock */ 3830 status = nfserr_denied; 3831 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); 3832 nfs4_set_lock_denied(&conflock, &lock->lk_denied); 3833 break; 3834 case (EDEADLK): 3835 status = nfserr_deadlock; 3836 break; 3837 default: 3838 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); 3839 status = nfserr_resource; 3840 break; 3841 } 3842 out: 3843 if (status && lock->lk_is_new && lock_sop) 3844 release_lockowner(lock_sop); 3845 if (lock->lk_replay_owner) { 3846 nfs4_get_stateowner(lock->lk_replay_owner); 3847 cstate->replay_owner = lock->lk_replay_owner; 3848 } 3849 nfs4_unlock_state(); 3850 return status; 3851 } 3852 3853 /* 3854 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, 3855 * so we do a temporary open here just to get an open file to pass to 3856 * vfs_test_lock. (Arguably perhaps test_lock should be done with an 3857 * inode operation.) 3858 */ 3859 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) 3860 { 3861 struct file *file; 3862 int err; 3863 3864 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 3865 if (err) 3866 return err; 3867 err = vfs_test_lock(file, lock); 3868 nfsd_close(file); 3869 return err; 3870 } 3871 3872 /* 3873 * LOCKT operation 3874 */ 3875 __be32 3876 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3877 struct nfsd4_lockt *lockt) 3878 { 3879 struct inode *inode; 3880 struct file_lock file_lock; 3881 int error; 3882 __be32 status; 3883 3884 if (locks_in_grace()) 3885 return nfserr_grace; 3886 3887 if (check_lock_length(lockt->lt_offset, lockt->lt_length)) 3888 return nfserr_inval; 3889 3890 lockt->lt_stateowner = NULL; 3891 nfs4_lock_state(); 3892 3893 status = nfserr_stale_clientid; 3894 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid)) 3895 goto out; 3896 3897 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) { 3898 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); 3899 if (status == nfserr_symlink) 3900 status = nfserr_inval; 3901 goto out; 3902 } 3903 3904 inode = cstate->current_fh.fh_dentry->d_inode; 3905 locks_init_lock(&file_lock); 3906 switch (lockt->lt_type) { 3907 case NFS4_READ_LT: 3908 case NFS4_READW_LT: 3909 file_lock.fl_type = F_RDLCK; 3910 break; 3911 case NFS4_WRITE_LT: 3912 case NFS4_WRITEW_LT: 3913 file_lock.fl_type = F_WRLCK; 3914 break; 3915 default: 3916 dprintk("NFSD: nfs4_lockt: bad lock type!\n"); 3917 status = nfserr_inval; 3918 goto out; 3919 } 3920 3921 lockt->lt_stateowner = find_lockstateowner_str(inode, 3922 &lockt->lt_clientid, &lockt->lt_owner); 3923 if (lockt->lt_stateowner) 3924 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; 3925 file_lock.fl_pid = current->tgid; 3926 file_lock.fl_flags = FL_POSIX; 3927 3928 file_lock.fl_start = lockt->lt_offset; 3929 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); 3930 3931 nfs4_transform_lock_offset(&file_lock); 3932 3933 status = nfs_ok; 3934 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock); 3935 if (error) { 3936 status = nfserrno(error); 3937 goto out; 3938 } 3939 if (file_lock.fl_type != F_UNLCK) { 3940 status = nfserr_denied; 3941 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); 3942 } 3943 out: 3944 nfs4_unlock_state(); 3945 return status; 3946 } 3947 3948 __be32 3949 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 3950 struct nfsd4_locku *locku) 3951 { 3952 struct nfs4_stateid *stp; 3953 struct file *filp = NULL; 3954 struct file_lock file_lock; 3955 __be32 status; 3956 int err; 3957 3958 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", 3959 (long long) locku->lu_offset, 3960 (long long) locku->lu_length); 3961 3962 if (check_lock_length(locku->lu_offset, locku->lu_length)) 3963 return nfserr_inval; 3964 3965 nfs4_lock_state(); 3966 3967 if ((status = nfs4_preprocess_seqid_op(cstate, 3968 locku->lu_seqid, 3969 &locku->lu_stateid, 3970 LOCK_STATE, 3971 &locku->lu_stateowner, &stp, NULL))) 3972 goto out; 3973 3974 filp = find_any_file(stp->st_file); 3975 if (!filp) { 3976 status = nfserr_lock_range; 3977 goto out; 3978 } 3979 BUG_ON(!filp); 3980 locks_init_lock(&file_lock); 3981 file_lock.fl_type = F_UNLCK; 3982 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; 3983 file_lock.fl_pid = current->tgid; 3984 file_lock.fl_file = filp; 3985 file_lock.fl_flags = FL_POSIX; 3986 file_lock.fl_lmops = &nfsd_posix_mng_ops; 3987 file_lock.fl_start = locku->lu_offset; 3988 3989 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length); 3990 nfs4_transform_lock_offset(&file_lock); 3991 3992 /* 3993 * Try to unlock the file in the VFS. 3994 */ 3995 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); 3996 if (err) { 3997 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); 3998 goto out_nfserr; 3999 } 4000 /* 4001 * OK, unlock succeeded; the only thing left to do is update the stateid. 4002 */ 4003 update_stateid(&stp->st_stateid); 4004 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); 4005 4006 out: 4007 if (locku->lu_stateowner) { 4008 nfs4_get_stateowner(locku->lu_stateowner); 4009 cstate->replay_owner = locku->lu_stateowner; 4010 } 4011 nfs4_unlock_state(); 4012 return status; 4013 4014 out_nfserr: 4015 status = nfserrno(err); 4016 goto out; 4017 } 4018 4019 /* 4020 * returns 4021 * 1: locks held by lockowner 4022 * 0: no locks held by lockowner 4023 */ 4024 static int 4025 check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner) 4026 { 4027 struct file_lock **flpp; 4028 struct inode *inode = filp->fi_inode; 4029 int status = 0; 4030 4031 lock_flocks(); 4032 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { 4033 if ((*flpp)->fl_owner == (fl_owner_t)lowner) { 4034 status = 1; 4035 goto out; 4036 } 4037 } 4038 out: 4039 unlock_flocks(); 4040 return status; 4041 } 4042 4043 __be32 4044 nfsd4_release_lockowner(struct svc_rqst *rqstp, 4045 struct nfsd4_compound_state *cstate, 4046 struct nfsd4_release_lockowner *rlockowner) 4047 { 4048 clientid_t *clid = &rlockowner->rl_clientid; 4049 struct nfs4_stateowner *sop; 4050 struct nfs4_stateid *stp; 4051 struct xdr_netobj *owner = &rlockowner->rl_owner; 4052 struct list_head matches; 4053 int i; 4054 __be32 status; 4055 4056 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", 4057 clid->cl_boot, clid->cl_id); 4058 4059 /* XXX check for lease expiration */ 4060 4061 status = nfserr_stale_clientid; 4062 if (STALE_CLIENTID(clid)) 4063 return status; 4064 4065 nfs4_lock_state(); 4066 4067 status = nfserr_locks_held; 4068 /* XXX: we're doing a linear search through all the lockowners. 4069 * Yipes! For now we'll just hope clients aren't really using 4070 * release_lockowner much, but eventually we have to fix these 4071 * data structures. */ 4072 INIT_LIST_HEAD(&matches); 4073 for (i = 0; i < LOCK_HASH_SIZE; i++) { 4074 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { 4075 if (!same_owner_str(sop, owner, clid)) 4076 continue; 4077 list_for_each_entry(stp, &sop->so_stateids, 4078 st_perstateowner) { 4079 if (check_for_locks(stp->st_file, sop)) 4080 goto out; 4081 /* Note: so_perclient unused for lockowners, 4082 * so it's OK to fool with here. */ 4083 list_add(&sop->so_perclient, &matches); 4084 } 4085 } 4086 } 4087 /* Clients probably won't expect us to return with some (but not all) 4088 * of the lockowner state released; so don't release any until all 4089 * have been checked. */ 4090 status = nfs_ok; 4091 while (!list_empty(&matches)) { 4092 sop = list_entry(matches.next, struct nfs4_stateowner, 4093 so_perclient); 4094 /* unhash_stateowner deletes so_perclient only 4095 * for openowners. */ 4096 list_del(&sop->so_perclient); 4097 release_lockowner(sop); 4098 } 4099 out: 4100 nfs4_unlock_state(); 4101 return status; 4102 } 4103 4104 static inline struct nfs4_client_reclaim * 4105 alloc_reclaim(void) 4106 { 4107 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); 4108 } 4109 4110 int 4111 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id) 4112 { 4113 unsigned int strhashval = clientstr_hashval(name); 4114 struct nfs4_client *clp; 4115 4116 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id); 4117 return clp ? 1 : 0; 4118 } 4119 4120 /* 4121 * failure => all reset bets are off, nfserr_no_grace... 4122 */ 4123 int 4124 nfs4_client_to_reclaim(const char *name) 4125 { 4126 unsigned int strhashval; 4127 struct nfs4_client_reclaim *crp = NULL; 4128 4129 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); 4130 crp = alloc_reclaim(); 4131 if (!crp) 4132 return 0; 4133 strhashval = clientstr_hashval(name); 4134 INIT_LIST_HEAD(&crp->cr_strhash); 4135 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); 4136 memcpy(crp->cr_recdir, name, HEXDIR_LEN); 4137 reclaim_str_hashtbl_size++; 4138 return 1; 4139 } 4140 4141 static void 4142 nfs4_release_reclaim(void) 4143 { 4144 struct nfs4_client_reclaim *crp = NULL; 4145 int i; 4146 4147 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 4148 while (!list_empty(&reclaim_str_hashtbl[i])) { 4149 crp = list_entry(reclaim_str_hashtbl[i].next, 4150 struct nfs4_client_reclaim, cr_strhash); 4151 list_del(&crp->cr_strhash); 4152 kfree(crp); 4153 reclaim_str_hashtbl_size--; 4154 } 4155 } 4156 BUG_ON(reclaim_str_hashtbl_size); 4157 } 4158 4159 /* 4160 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ 4161 static struct nfs4_client_reclaim * 4162 nfs4_find_reclaim_client(clientid_t *clid) 4163 { 4164 unsigned int strhashval; 4165 struct nfs4_client *clp; 4166 struct nfs4_client_reclaim *crp = NULL; 4167 4168 4169 /* find clientid in conf_id_hashtbl */ 4170 clp = find_confirmed_client(clid); 4171 if (clp == NULL) 4172 return NULL; 4173 4174 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", 4175 clp->cl_name.len, clp->cl_name.data, 4176 clp->cl_recdir); 4177 4178 /* find clp->cl_name in reclaim_str_hashtbl */ 4179 strhashval = clientstr_hashval(clp->cl_recdir); 4180 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { 4181 if (same_name(crp->cr_recdir, clp->cl_recdir)) { 4182 return crp; 4183 } 4184 } 4185 return NULL; 4186 } 4187 4188 /* 4189 * Called from OPEN. Look for clientid in reclaim list. 4190 */ 4191 __be32 4192 nfs4_check_open_reclaim(clientid_t *clid) 4193 { 4194 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; 4195 } 4196 4197 /* initialization to perform at module load time: */ 4198 4199 int 4200 nfs4_state_init(void) 4201 { 4202 int i, status; 4203 4204 status = nfsd4_init_slabs(); 4205 if (status) 4206 return status; 4207 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 4208 INIT_LIST_HEAD(&conf_id_hashtbl[i]); 4209 INIT_LIST_HEAD(&conf_str_hashtbl[i]); 4210 INIT_LIST_HEAD(&unconf_str_hashtbl[i]); 4211 INIT_LIST_HEAD(&unconf_id_hashtbl[i]); 4212 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); 4213 } 4214 for (i = 0; i < SESSION_HASH_SIZE; i++) 4215 INIT_LIST_HEAD(&sessionid_hashtbl[i]); 4216 for (i = 0; i < FILE_HASH_SIZE; i++) { 4217 INIT_LIST_HEAD(&file_hashtbl[i]); 4218 } 4219 for (i = 0; i < OWNER_HASH_SIZE; i++) { 4220 INIT_LIST_HEAD(&ownerstr_hashtbl[i]); 4221 INIT_LIST_HEAD(&ownerid_hashtbl[i]); 4222 } 4223 for (i = 0; i < STATEID_HASH_SIZE; i++) { 4224 INIT_LIST_HEAD(&stateid_hashtbl[i]); 4225 INIT_LIST_HEAD(&lockstateid_hashtbl[i]); 4226 } 4227 for (i = 0; i < LOCK_HASH_SIZE; i++) { 4228 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); 4229 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); 4230 } 4231 memset(&onestateid, ~0, sizeof(stateid_t)); 4232 INIT_LIST_HEAD(&close_lru); 4233 INIT_LIST_HEAD(&client_lru); 4234 INIT_LIST_HEAD(&del_recall_lru); 4235 reclaim_str_hashtbl_size = 0; 4236 return 0; 4237 } 4238 4239 static void 4240 nfsd4_load_reboot_recovery_data(void) 4241 { 4242 int status; 4243 4244 nfs4_lock_state(); 4245 nfsd4_init_recdir(user_recovery_dirname); 4246 status = nfsd4_recdir_load(); 4247 nfs4_unlock_state(); 4248 if (status) 4249 printk("NFSD: Failure reading reboot recovery data\n"); 4250 } 4251 4252 /* 4253 * Since the lifetime of a delegation isn't limited to that of an open, a 4254 * client may quite reasonably hang on to a delegation as long as it has 4255 * the inode cached. This becomes an obvious problem the first time a 4256 * client's inode cache approaches the size of the server's total memory. 4257 * 4258 * For now we avoid this problem by imposing a hard limit on the number 4259 * of delegations, which varies according to the server's memory size. 4260 */ 4261 static void 4262 set_max_delegations(void) 4263 { 4264 /* 4265 * Allow at most 4 delegations per megabyte of RAM. Quick 4266 * estimates suggest that in the worst case (where every delegation 4267 * is for a different inode), a delegation could take about 1.5K, 4268 * giving a worst case usage of about 6% of memory. 4269 */ 4270 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); 4271 } 4272 4273 /* initialization to perform when the nfsd service is started: */ 4274 4275 static int 4276 __nfs4_state_start(void) 4277 { 4278 int ret; 4279 4280 boot_time = get_seconds(); 4281 locks_start_grace(&nfsd4_manager); 4282 printk(KERN_INFO "NFSD: starting %ld-second grace period\n", 4283 nfsd4_grace); 4284 ret = set_callback_cred(); 4285 if (ret) 4286 return -ENOMEM; 4287 laundry_wq = create_singlethread_workqueue("nfsd4"); 4288 if (laundry_wq == NULL) 4289 return -ENOMEM; 4290 ret = nfsd4_create_callback_queue(); 4291 if (ret) 4292 goto out_free_laundry; 4293 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ); 4294 set_max_delegations(); 4295 return 0; 4296 out_free_laundry: 4297 destroy_workqueue(laundry_wq); 4298 return ret; 4299 } 4300 4301 int 4302 nfs4_state_start(void) 4303 { 4304 nfsd4_load_reboot_recovery_data(); 4305 return __nfs4_state_start(); 4306 } 4307 4308 static void 4309 __nfs4_state_shutdown(void) 4310 { 4311 int i; 4312 struct nfs4_client *clp = NULL; 4313 struct nfs4_delegation *dp = NULL; 4314 struct list_head *pos, *next, reaplist; 4315 4316 for (i = 0; i < CLIENT_HASH_SIZE; i++) { 4317 while (!list_empty(&conf_id_hashtbl[i])) { 4318 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); 4319 expire_client(clp); 4320 } 4321 while (!list_empty(&unconf_str_hashtbl[i])) { 4322 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); 4323 expire_client(clp); 4324 } 4325 } 4326 INIT_LIST_HEAD(&reaplist); 4327 spin_lock(&recall_lock); 4328 list_for_each_safe(pos, next, &del_recall_lru) { 4329 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4330 list_move(&dp->dl_recall_lru, &reaplist); 4331 } 4332 spin_unlock(&recall_lock); 4333 list_for_each_safe(pos, next, &reaplist) { 4334 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); 4335 list_del_init(&dp->dl_recall_lru); 4336 unhash_delegation(dp); 4337 } 4338 4339 nfsd4_shutdown_recdir(); 4340 } 4341 4342 void 4343 nfs4_state_shutdown(void) 4344 { 4345 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); 4346 destroy_workqueue(laundry_wq); 4347 locks_end_grace(&nfsd4_manager); 4348 nfs4_lock_state(); 4349 nfs4_release_reclaim(); 4350 __nfs4_state_shutdown(); 4351 nfs4_unlock_state(); 4352 nfsd4_destroy_callback_queue(); 4353 } 4354 4355 /* 4356 * user_recovery_dirname is protected by the nfsd_mutex since it's only 4357 * accessed when nfsd is starting. 4358 */ 4359 static void 4360 nfs4_set_recdir(char *recdir) 4361 { 4362 strcpy(user_recovery_dirname, recdir); 4363 } 4364 4365 /* 4366 * Change the NFSv4 recovery directory to recdir. 4367 */ 4368 int 4369 nfs4_reset_recoverydir(char *recdir) 4370 { 4371 int status; 4372 struct path path; 4373 4374 status = kern_path(recdir, LOOKUP_FOLLOW, &path); 4375 if (status) 4376 return status; 4377 status = -ENOTDIR; 4378 if (S_ISDIR(path.dentry->d_inode->i_mode)) { 4379 nfs4_set_recdir(recdir); 4380 status = 0; 4381 } 4382 path_put(&path); 4383 return status; 4384 } 4385 4386 char * 4387 nfs4_recoverydir(void) 4388 { 4389 return user_recovery_dirname; 4390 } 4391